High-power diesel engine intermediate gear shaft hoisting tool

Abstract

The application discloses a hoisting tool for a middle gear shaft of a high-power diesel engine, which comprises a right-angle hanger, a manual pressing rod, a composite driving mechanism, an upper clamping device, a lower clamping device and a clamping device vertical distance adjusting mechanism, the one end of the manual pressing rod is hinged to the hinged seat on one side of the right-angle hanger, the middle part of the manual pressing rod is hinged to the upper end of the composite driving mechanism, and the manual pressing rod is also connected with the manual pressing rod locking mechanism which is fixed to the middle part of the other side of the screw away from the hanger ring of the two vertical plates. The lower end of the composite driving mechanism is fixedly connected with the upper clamping device, the upper end of the upper clamping device is clamped and fixed to the lower end of the two vertical plates, and the upper clamping device and the lower clamping device are connected through the clamping device vertical distance adjusting mechanism. The application has the advantages of compact structure, convenient and labor-saving use, greatly reduced labor intensity, reduced manufacturing cost, significantly improved work efficiency, and good versatility for meeting the hoisting of the middle gear shafts of different types of diesel engines.

Description

Technical Field

[0001] This invention relates to a lifting tool for high-power (3000kW and above) diesel engine components, and particularly to a lifting tool for horizontally lifting intermediate gear shafts with a diameter ≥100mm to the diesel engine gearbox, belonging to the field of lifting tool technology. Background Technology

[0002] Gear transmission is one of the most widely used transmission methods in mechanical transmission. To change the transmission distance, transmission direction, and transmission ratio, it is necessary to add one (or more) gears or one (or more) gear sets between the driving gear and the driven gear; these are called intermediate gears or intermediate gear sets. Currently, the normal operation of most marine diesel engine components (equipment), such as the intake camshaft, exhaust camshaft, lubricating oil pump, and cooling water pump, is achieved through gear meshing with the crankshaft transmission components. Intermediate gears and intermediate gear sets are needed in their gearboxes to achieve different transmission distances and ratios. Due to the weight of the intermediate gear shaft in large marine diesel engines, and the limitations imposed by the diesel engine gearbox and assembly characteristics, the intermediate gear shaft needs to be horizontally hoisted. Currently, a fixed plate is used as the hoisting tool. This fixed plate is fixed to the shaft end fixed plate of the intermediate gear shaft, and a long steel plate or long rectangular steel pipe is welded to one side of the fixed plate. During hoisting, one end of the long steel plate or long rectangular steel pipe is manually pressed down until the hoisting is completed to balance the overturning moment of the intermediate gear shaft. The upper and lower mounting holes on the fixed plate are fixedly connected to the two lifting holes on the shaft end fixed plate of the intermediate gear shaft by bolts and adjusting nuts. Then, the intermediate gear shaft is horizontally lifted to the diesel engine gearbox for assembly by lifting the fixed plate. Before lifting, the bolts and adjusting nuts must be tightened, and when removing the fixed plate, the bolts and adjusting nuts must be removed, which is time-consuming, labor-intensive, inefficient, and poses safety hazards. Summary of the Invention

[0003] The purpose of this invention is to provide a high-power diesel engine intermediate gear shaft hoisting tool that can efficiently and safely hoist the intermediate gear shaft.

[0004] This invention is achieved through the following technical solution:

[0005] A lifting tool for the intermediate gear shaft of a high-power diesel engine includes a right-angled lifting frame, a manual pressure rod, a compound drive mechanism, an upper clamping device, a lower clamping device, and a vertical distance adjustment mechanism for the clamping devices. The right-angled lifting frame includes an upper support plate and vertical plates respectively fixed to the lower sides of one end of the upper support plate. A lifting eye screw is vertically fixed to the other end of the upper support plate. One end of the manual pressure rod, which passes diagonally between the upper ends of the two vertical plates, is hinged to a hinge seat. The hinge seat is fixed to the middle of the two vertical plates on the side facing the lifting eye screw. The middle part of the manual pressure rod is hinged to the upper end of the compound drive mechanism embedded in the middle of the two vertical plates. The manual pressure rod is also connected to a locking mechanism of the manual pressure rod fixed to the middle of the other side of the two vertical plates away from the lifting eye screw. The lower end of the compound drive mechanism is fixedly connected to the upper clamping device. The upper end of the upper clamping device clamps and fixes itself to the lower end of the two vertical plates. The upper clamping device and the lower clamping device are connected vertically by the vertical distance adjustment mechanism for the clamping devices.

[0006] The objectives of this invention can also be further achieved through the following technical measures.

[0007] Furthermore, the manual lever locking mechanism includes an arc-shaped ratchet, a pawl, and a tension spring. The upper and lower ends of the arc-shaped ratchet are fixed to the upper part of one side of the two upright plates of the right-angled bracket. The pawl is in an asymmetrical V-shape. The bottom of the asymmetrical V-shape is hinged to the other end of the manual lever. The tip of the pawl at one end of the asymmetrical V-shape is locked in the groove of the arc-shaped ratchet. The other end of the asymmetrical V-shape extends outward to a length greater than the tip of the pawl. The two ends of the tension spring are respectively connected to the middle of the tip of the pawl and the middle of the manual lever.

[0008] Furthermore, the composite drive mechanism includes a hydraulic oil compensation tank, an upper drive cylinder, a lower drive cylinder, and an intermediate pressure spring. The upper drive cylinder includes an upper cylinder body, an upper plunger, and an upper plunger return pressure spring. Vertical guide blocks on both sides of the upper cylinder body are respectively embedded in corresponding guide grooves of the vertical plate. The lower end of the stepped shaft-shaped upper plunger of the vertical plate is embedded in the upper cylinder body. The upper plunger return pressure spring is located in the lower end of the upper cylinder body. The upper end of the upper plunger is hinged to the middle of the manual pressure rod through an upper plunger hinge seat. The lower drive cylinder includes a lower cylinder body and a lower plunger. The upper end of the intermediate pressure spring abuts against the bottom surface of the upper cylinder body, and the lower end abuts against the top surface of the lower cylinder body. The top end of the lower plunger is fixed to the bottom of the upper cylinder body, and the lower end of the lower plunger passes through... A reset spring extends into the lower cylinder body. The lower cylinder body is fixedly connected to the lower ends of two vertical plates on both sides. The bottom of the lower cylinder body is fixed to a clamping plate, the upper end of which is embedded and fixed to the lower ends of the two vertical plates. The upper end of the vertical distance adjustment mechanism of the clamping device is located between a pair of support plates on the lower side of the upper clamping device and is fixedly connected to the pair of support plates. The lower end of the vertical distance adjustment mechanism is fixedly connected to the upper end of the lower clamping device. One side of the hydraulic oil compensation tank is fixed to one side of the upper cylinder body. A horizontal oil hole passes through the lower part of the side wall of the hydraulic oil compensation tank and the middle part of the adjacent side wall of the upper cylinder body, leading to the lower part of the upper cylinder body. The bottom of the hydraulic oil compensation tank is connected to the upper oil hole on the side wall of the lower cylinder body through a first oil delivery hose. A retaining ring is embedded in the upper end of the upper cylinder body. When the lower end of the upper plunger moves into position, the upper side of the plunger abuts against the retaining ring. Corresponding rubber sealing rings are provided between the mating surfaces of the upper plunger and the upper cylinder body, and between the lower plunger and the lower cylinder body. The opening pressure F1 of the intermediate compression spring is greater than the maximum pressure F2 of the upper plunger reset compression spring.

[0009] Furthermore, the upper and lower clamping devices have the same structure, each including a load-bearing rod, a load-bearing rod sleeve, a horizontal cylinder, and a horizontal reset spring. The lower end of the clamping plate is fixed to the upper side of the load-bearing rod sleeve of the upper clamping device. The upper end of the vertical distance adjustment mechanism of the clamping device is located between a pair of support plates, and the upper ends of the pair of support plates are fixed to the lower side of the load-bearing rod sleeve of the upper clamping device. The lower end of the vertical distance adjustment mechanism of the clamping device is fixed to the upper side of the load-bearing rod sleeve of the lower clamping device. One end of the horizontal cylinder is fixedly connected to one end of the adjacent load-bearing rod sleeve by threads. One end of the load-bearing rod extends out of the corresponding end of the load-bearing rod sleeve, and the other end of the load-bearing rod extends out of the corresponding other end of the horizontal cylinder. The piston located on the other end of the load-bearing rod supports... In the corresponding horizontal cylinder, the two ends of the horizontal reset spring are located between the corresponding piston side and the bottom of the horizontal cylinder, respectively; a vertical telescopic cylinder with a stop shaft is also provided at one end of the load-bearing rod, and the axial oil hole of the load-bearing rod is vertically connected to one end of the vertical telescopic cylinder with the stop shaft; the second oil supply hose connected to the lower end of the upper cylinder is divided into two paths, which are respectively connected to one end of the axial oil hole of the load-bearing rod of the upper clamping device and one end of the axial oil hole of the load-bearing rod of the lower clamping device; the third oil supply hose connected to the lower oil hole of the side wall of the lower cylinder is also divided into two paths, which are respectively connected to the cavity of the corresponding horizontal cylinder of the upper clamping device and the lower clamping device facing the load-bearing rod sleeve; corresponding rubber sealing rings are provided between the mating surfaces of the load-bearing rod and the load-bearing rod sleeve, and between the mating surfaces of the horizontal cylinder and the piston.

[0010] Furthermore, when the upper plunger is at its extreme position at the upper end of the upper cylinder block, the horizontal oil hole is adjacent to the lower side of the upper plunger; when the lower plunger is at its extreme position at the upper end of the lower cylinder block, the upper oil hole on the side wall of the lower cylinder block is adjacent to the lower side of the lower plunger.

[0011] Furthermore, the vertical telescopic cylinder of the stop shaft includes a stepped stop shaft, a vertical return spring, and a screw plug. The piston in the middle of the stepped stop shaft is embedded in the vertical hole at one end of the load-bearing rod, dividing the vertical hole into two closed cavities. One cavity is connected to the other end of the axial oil hole of the load-bearing rod, and the vertical return spring is located in the other cavity. The screw plug seals the end of the other cavity. The piston in the middle and the circumference of the vertical hole, as well as the screw plug and the end face of the vertical hole, are sealed by rubber sealing rings.

[0012] Furthermore, the vertical distance adjustment mechanism of the clamping device includes a slotted stud, an upper limit plate, a lower limit plate, and an adjusting nut. The lower end of the slotted stud is fixed to the upper middle part of the load-bearing rod sleeve of the lower clamping device, and the upper end of the slotted stud is screwed into the round adjusting nut. The upper limit plate is fixed to the middle of the inner side of a pair of support plates, and the lower limit plate is fixed to the lower end port of a pair of support plates. The upper and lower sides of the round adjusting nut are supported between the upper limit plate and the lower limit plate by a ring of multiple balls. The guide groove of the slotted stud is clearance-fitted with the guide key fixed at the opening of the lower limit plate.

[0013] The composite drive mechanism of this invention employs two drive cylinders connected by a lower plunger and an intermediate compression spring. When the manual lever is pressed down, the pressurized hydraulic oil in the upper drive cylinder is first input into the vertical telescopic cylinders of the corresponding bearing rod ends of the upper and lower clamping devices, driving the stepped bearing rods to extend fully vertically outward, preventing the shaft end fixing plate of the intermediate gear shaft from detaching from the bearing rod. As the manual lever continues to press down, the lower plunger is pushed down by the downward movement of the upper drive cylinder, causing the pressure oil output from the lower drive cylinder to be input into the drive cylinders, pushing the corresponding pistons to the right to clamp the lifting holes of the shaft end fixing plate of the intermediate gear shaft, ensuring the safe lifting of the intermediate gear shaft. A single manual press of the lever enables the sequential actions of vertical movement and limiting of the stepped stop shaft, and rightward movement of the piston to clamp the shaft end fixing plate of the intermediate gear shaft. This eliminates the need for hydraulic valves and the bolts and adjusting nuts connecting the tooling and the shaft end fixing plate of the intermediate gear shaft. The compact structure and ease of use significantly reduce labor intensity, manufacturing costs, and the hoisting time of the intermediate gear shaft, thus greatly improving work efficiency. The vertical distance adjustment mechanism of the clamping device can adjust the distance between the two load-bearing rods, thereby accommodating the hoisting of intermediate gear shafts from different diesel engine models, demonstrating good versatility.

[0014] The advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the present invention;

[0016] Figure 2 yes Figure 1 The left view;

[0017] Figure 3 This is a schematic diagram of using the present invention to hoist the intermediate gear shaft;

[0018] Figure 4 yes Figure 1 Enlarged view of Part I. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] like Figures 1-3As shown, the present invention includes a right-angled hanger 1, a manual pressure rod 2, a composite drive mechanism 3, an upper clamping device 4, a lower clamping device 5, and a vertical distance adjustment mechanism for the clamping devices 6. The right-angled hanger includes an upper support plate 11 and vertical plates 12 respectively fixed vertically to the lower right sides of the upper support plate 11. Lifting eye screws 13 are vertically fixed to the left side of the upper support plate 11. The structure of the right-angled hanger 1 allows the lifting centerline to be close to the center of gravity of the intermediate gear shaft 10, ensuring that the intermediate gear shaft 10 is horizontal after lifting.

[0021] The manual pressure rod 2 passes diagonally between the upper ends of the two upright plates 12. Its left end is hinged to the hinge seat 14, which is welded and fixed to the middle of the two upright plates 12 on the side facing the eye bolt 13 (left side). The middle part of the manual pressure rod 2 is hinged to the upper end of the composite drive mechanism 3, which is embedded in the middle of the two upright plates 12. The manual pressure rod 2 is also connected to the manual pressure rod locking mechanism 7, which is fixed to the middle of the other side (right side) of the two upright plates 12 away from the eye bolt 13. The lower end of the composite drive mechanism 3 is fixedly connected to the upper clamping device 4. The upper end of the upper clamping device 4 is clamped and fixed in the lower end of the two upright plates 12. The upper clamping device 4 and the lower clamping device 5 are connected vertically by the clamping device vertical distance adjustment mechanism 6.

[0022] The manual lever locking mechanism 7 includes an arc-shaped ratchet 71, a pawl 72, and a tension spring 73. The arc-shaped ratchet 71 is fixed at both ends to the upper right side of the two upright plates 12 of the right-angled hanger 1. The pawl 72 is asymmetrically V-shaped, with its bottom hinged to the right end of the manual lever 2. The pawl tip 721 at the left end of the asymmetrical V-shape is locked in the groove 711 of the arc-shaped ratchet 71. The right end of the asymmetrical V-shape extends outwards to form a lever 722, longer than the pawl tip 721. Pressing the lever 722 lifts the pawl tip 721, disengaging it from the groove 711, thus unlocking the manual lever 2. The tension spring 73 is connected at both ends to the middle of the pawl 72 and the middle of the manual lever 2, respectively. The manual lever locking mechanism 7 of this invention ensures reliable locking of the manual lever 2 after it is pressed down, while the longer lever 722 makes unlocking the pawl 72 from the groove 711 easy and effortless.

[0023] The composite drive mechanism 3 includes a hydraulic oil compensation tank 31, an upper drive cylinder 32, a lower drive cylinder 33, and an intermediate compression spring 34. The upper drive cylinder 32 includes an upper cylinder body 321, an upper plunger 322, and an upper plunger return compression spring 323. Vertical guide blocks 3211 on both sides of the upper cylinder body 321 are respectively embedded in the corresponding vertical plate guide grooves 121, providing precise guidance for the vertical movement of the upper cylinder body 321. The lower end of the stepped shaft-shaped upper plunger 322 is embedded in the upper cylinder body 321. The upper plunger return compression spring 323 is located in the lower end of the upper cylinder body 321. The upper end of the upper plunger 322 is hinged to the middle of the manual pressure rod 2 through the upper plunger hinge seat 35. The lower drive cylinder 33 includes a lower cylinder body 331 and a lower plunger 332. The upper end of the intermediate compression spring 34 abuts against the bottom surface of the upper cylinder body 321, and the lower end abuts against the top surface of the lower cylinder body 331. The top of the lower plunger 332 is fixed to the bottom of the upper cylinder 321. The lower end of the lower plunger 332 extends into the lower cylinder 331 through the intermediate compression spring 34. The two sides of the lower cylinder 331 are fixedly connected to the lower ends of the two vertical plates 12. The bottom of the lower cylinder 331 is fixed to the clamping plate 8. The upper end of the clamping plate 8 is embedded in the lower ends of the two vertical plates 12 and is fixedly connected to the two vertical plates 12 by two sets of bolt and nut sets 82. The upper end of the vertical distance adjustment mechanism 6 of the clamping device is located between a pair of support plates 81 on the lower side of the upper clamping device 4. The lower end of the vertical distance adjustment mechanism 6 of the clamping device is fixedly connected to the upper end of the lower clamping device 5. The left side of the hydraulic oil compensation tank 31 is fixed to the right side of the upper cylinder 321. The horizontal oil hole 311 passes through the lower part of the side wall of the hydraulic oil compensation tank 31 and the middle part of the side wall of the adjacent upper cylinder 321, and enters the lower part of the upper cylinder 321. The bottom of the hydraulic oil compensation tank 31 is connected to the upper oil hole 333 on the side wall of the lower cylinder body via the first oil supply hose 312. A retaining ring 324 is embedded in the upper end of the upper cylinder body 321. When the lower end of the upper plunger 322's plunger body 3221 moves into position, the upper side of the plunger body 3221 abuts against the retaining ring 324. The retaining ring 324 limits the plunger body 3221, preventing the upper plunger 322 from disengaging from the upper cylinder body 321 when the manual lever 2 is excessively raised, thus ensuring the safe and normal use of the invention. Corresponding rubber sealing rings are provided between the mating surfaces of the upper plunger 322 and the upper cylinder body 321, and between the lower plunger 332 and the lower cylinder body 331.

[0024] When the upper plunger 322 is at its extreme position at the upper end of the upper cylinder 321, the horizontal oil hole 311 is adjacent to the lower side of the upper plunger 322. When the lower plunger 332 is at its extreme position at the upper end of the lower cylinder 321, the upper oil hole 333 on the side wall of the lower cylinder 321 is adjacent to the lower side of the lower plunger 332. This ensures that the hydraulic oil in the hydraulic oil compensation tank 31 fills the lower cavity of the upper cylinder 321 through the horizontal oil hole 311, and the bottom of the hydraulic oil compensation tank 31 fills the lower cavity of the lower cylinder 331 through the first oil hose 312 and the upper oil hole 333. This allows the manual pressure rod 2 to be pressed down to achieve the sequential action of first limiting and then clamping the shaft end fixing plate 101 at one end of the intermediate gear shaft 10, ensuring the lifting safety of the intermediate gear shaft 10.

[0025] The upper clamping device 4 and the lower clamping device 5 have the same structure, each including a load-bearing rod 41, a load-bearing rod sleeve 42, a horizontal cylinder 43, and a horizontal reset spring 44. The lower end of the clamping plate 8 is welded and fixed to the upper side of the load-bearing rod sleeve 42 of the upper clamping device 4. The upper end of the vertical distance adjustment mechanism 6 of the clamping device is located between a pair of support plates 81, and the upper ends of the pair of support plates 81 are welded and fixed to the lower side of the load-bearing rod sleeve 42 of the upper clamping device 4. The lower end of the vertical distance adjustment mechanism 6 of the clamping device is fixed to the upper side of the load-bearing rod sleeve 42 of the lower clamping device 5. The left end of the horizontal cylinder 43 is fixedly connected to the right end of the adjacent load-bearing rod sleeve 42 by threads. The left end of the load-bearing rod 41 extends out of the left end of the corresponding load-bearing rod sleeve 43, and the right end extends out of the right end of the corresponding horizontal cylinder 43. The piston 411 located on the right end of the load-bearing rod 41 is supported in the corresponding horizontal cylinder 43. The two ends of the horizontal reset spring 44 are located between the right side of the corresponding piston 421 and the bottom of the horizontal cylinder 43. The right end of the load-bearing rod 41 is also provided with a vertical telescopic cylinder 45 for stopping the shaft. The axial oil hole 412 of the load-bearing rod is vertically connected to one end of the vertical telescopic cylinder 45. The second oil hose 36 connected to the lower end of the upper cylinder 321 is divided into two paths, which are respectively connected to the right end of the axial oil hole 412 of the upper clamping device 4 and the right end of the axial oil hole 412 of the lower clamping device. The third oil hose 37, connected to the oil hole 334 on the lower side wall of the lower cylinder, is also divided into two routes, which are respectively connected to the cavities of the corresponding horizontal cylinders 43 of the upper clamping device 4 and the lower clamping device 5 facing the right end of the load-bearing rod sleeve 42. Corresponding rubber sealing rings are provided between the mating surfaces of the load-bearing rod 41 and the load-bearing rod sleeve 42, and between the mating surfaces of the horizontal cylinder 43 and the piston 411.

[0026] like Figure 4 As shown, the vertical telescopic cylinder 45 is a single-acting piston cylinder, comprising a stepped stop shaft 451, a vertical return spring 452, and a screw plug 453. The middle piston 4511 of the stepped stop shaft 451 is embedded in the vertical hole 413 at the right end of the load-bearing rod 41, dividing the vertical hole 413 into two closed cavities. The upper cavity communicates with the left end of the axial oil hole 412 of the load-bearing rod, and the vertical return spring 452 is located in the lower cavity. The screw plug 453 seals the end of the upper cavity. The middle piston 4511 and the circumferential surface of the vertical hole 413, as well as the screw plug 453 and the end face of the vertical hole 413, are sealed by rubber sealing rings.

[0027] The opening pressure F1 of the intermediate pressure spring 34 is greater than the maximum pressure F2 of the upper plunger return pressure spring 323. Therefore, when the manual pressure lever 2 begins to press down, the upper plunger 322 moves down first, while the lower plunger 332 remains stationary. When the manual pressure lever 2 continues to press down, the upper plunger 322 and the upper cylinder 321 move down together, driving the lower plunger 332 to move down to complete the following sequential actions: the stepped stop shaft 451 moves vertically first, thereby limiting the shaft end fixing plate 101 of the intermediate gear shaft 10. Then, the pistons 411 of the upper clamping device 4 and the lower clamping device 5 move to the right to clamp the shaft end fixing plate 101 of the intermediate gear shaft 10. The two actions are performed continuously to ensure the safe lifting of the intermediate gear shaft 10.

[0028] The vertical distance adjustment mechanism 6 of the clamping device includes a slotted stud 61, an upper limit plate 62, a lower limit plate 63, and an adjusting nut 64. The lower end of the slotted stud 61 is fixed to the upper middle part of the load-bearing rod sleeve 42 of the lower clamping device 5, and the upper end of the slotted stud 61 is screwed into the adjusting nut 64. The upper limit plate 62 is fixed to the middle of the inner side of a pair of support plates 81, and the lower limit plate 63 is fixed to the lower end port of the pair of support plates 81. The adjusting nut 64 is supported between the upper limit plate 62 and the lower limit plate 63 by a ring of multiple balls 65 on its upper and lower sides, respectively. The guide groove 611 of the slotted stud 61 is clearance-fitted with the guide key 66 fixed in the hole of the lower limit plate 63 on both sides. The vertical distance adjustment mechanism 6 of the clamping device is used to adjust the distance between the load-bearing rods 41 of the upper and lower clamping devices to meet the needs of hoisting the intermediate gear shaft 10 of different models of diesel engines.

[0029] The usage process of this invention is as follows:

[0030] First, connect the lifting wire rope and lifting shackle to the lifting eye bolt 13. Then, lift the present invention to the vicinity of the intermediate gear shaft 10, which is placed horizontally and has the shaft end fixing plate 101 installed. According to the position of the upper and lower lifting holes 102 of the shaft end fixing plate 101, rotate the adjusting nut 64 to adjust the distance between the upper and lower clamping devices of the present invention and the load-bearing rods 41, so that they match the distance between the upper and lower lifting holes 102 of the shaft end fixing plate 101. Then, insert the left ends of the upper and lower load-bearing rods 41 into the upper and lower lifting holes 102 on the shaft end fixing plate 101 at the same time, and make the shaft end fixing plate 101 abut against the end face of the corresponding load-bearing rod sleeve 42.

[0031] Then, the manual lever 2 is pressed down, and the manual lever 2 drives the upper plunger 322 to move downward through the upper plunger hinge seat 35. At this time, the hydraulic oil input from the hydraulic oil compensation box 3 to the upper cylinder 321 has filled the lower chamber of the upper cylinder 321 and the lower chamber of the lower cylinder 331. Under the pressure of the upper plunger 322 pressing down, the hydraulic oil with increased pressure in the upper cylinder 32 enters the axial oil hole 412 of the corresponding load-bearing rod 41 of the upper clamping device 4 and the lower clamping device 5 through the second oil supply hose 36. This pushes the stepped stop shaft 451 of the vertical telescopic cylinder 45 at the left end of the load-bearing rod 41 to extend vertically until the piston 4511 in the middle of the stepped stop shaft 451 moves into place. At this time, the stepped stop shaft 451 is fully extended.

[0032] Continue pressing down the manual lever 2. After the upper plunger 322 moves down to its position, it drives the upper cylinder 321 to move down after overcoming the elastic force of the intermediate compression spring 34. During the downward movement of the upper cylinder 321, the vertical guide blocks 3211 on both sides move vertically downward under the guidance of the corresponding vertical plate guide groove 121. At the same time, it drives the lower plunger 332 on the lower side of the upper cylinder 321 to move down. After the hydraulic oil pressure in the lower part of the lower cylinder 321 increases, it is input into the cavity at the right end of the corresponding horizontal cylinder 43 of the upper clamping device 4 and the lower clamping device 5 through the third oil supply hose 37. This pushes the piston 411 at the right end of the load-bearing rod 41 to move to the right and clamp the shaft end fixing plate 101. This allows for the first vertical outward movement of the stepped stop shaft 451 to limit the positioning of the intermediate gear shaft end fixing plate 101, followed by the rightward movement of the pistons 411 of the upper clamping device 4 and the lower clamping device 5. This results in the intermediate gear shaft 10's end fixing plate 101 being clamped on both sides by the stepped stop shaft 451 and the end faces of the load-bearing rod sleeve 42, respectively. Releasing the manual pressure lever 2 locks it in the working position using the manual pressure lever locking mechanism 7, maintaining the system oil pressure at 0.3–0.4 MPa. The intermediate gear shaft 10 can then be hoisted to the gearbox installation position, completing the hoisting of the intermediate gear shaft 10.

[0033] In addition to the above embodiments, the present invention may have other implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A lifting tool for the intermediate gear shaft of a high-power diesel engine, characterized in that: The device includes a right-angled hanger, a manual pressure rod, a composite drive mechanism, an upper clamping device, a lower clamping device, and a clamping device vertical distance adjustment mechanism. The right-angled hanger includes an upper support plate and two vertical plates fixed to the lower sides of one end of the upper support plate. A lifting eye screw is vertically fixed to the other end of the upper support plate. One end of the manual pressure rod, which passes diagonally through the upper part of the two vertical plates, is hinged to a hinge seat. The hinge seat is fixed to the middle of the two vertical plates on the side facing the lifting eye screw. The middle part of the manual pressure rod is hinged to the upper end of the composite drive mechanism, which is embedded in the middle of the two vertical plates. The manual pressure rod is also connected to a manual pressure rod locking mechanism fixed to the middle of the other side of the two vertical plates away from the lifting eye screw. The lower end of the composite drive mechanism is fixedly connected to the upper clamping device. The upper end of the upper clamping device clamps and fixes itself to the lower end of the two vertical plates. The upper clamping device and the lower clamping device are connected vertically by the clamping device vertical distance adjustment mechanism. The composite drive mechanism includes a hydraulic oil compensation tank, an upper drive cylinder, a lower drive cylinder, and an intermediate pressure spring. The upper drive cylinder includes an upper cylinder body, an upper plunger, and an upper plunger return spring. The lower end of the stepped shaft-shaped upper plunger is embedded in the upper cylinder body. The upper plunger return spring is located in the lower end of the upper cylinder body. The upper end of the upper plunger is hinged to the middle of the manual pressure rod through an upper plunger hinge seat. Vertical guide blocks on both sides of the upper cylinder body are respectively embedded in the corresponding vertical plate guide grooves. The lower drive cylinder includes a lower cylinder body and a lower plunger. The upper end of the intermediate pressure spring abuts against the bottom surface of the upper cylinder body, and the lower end abuts against the top surface of the lower cylinder body. The top end of the lower plunger is fixed to the bottom of the upper cylinder body, and the lower end of the lower plunger passes through the return spring. A compression spring extends into the lower cylinder body, and the two sides of the lower cylinder body are fixedly connected to the lower ends of two vertical plates. The bottom of the lower cylinder body is fixed to a clamping plate, and the upper end of the clamping plate is embedded and fixed in the lower ends of the two vertical plates. The upper end of the vertical distance adjustment mechanism of the clamping device is located between a pair of support plates on the lower side of the upper clamping device and is fixedly connected to a pair of support plates. The lower end of the vertical distance adjustment mechanism of the clamping device is fixedly connected to the upper end of the lower clamping device. One side of the hydraulic oil compensation tank is fixed to one side of the upper cylinder body. A horizontal oil hole passes through the lower part of the side wall of the hydraulic oil compensation tank and the middle part of the adjacent side wall of the upper cylinder body. The bottom of the hydraulic oil compensation tank is connected to the upper oil hole of the side wall of the lower cylinder body through the first oil delivery hose. The upper and lower clamping devices have identical structures, each including a load-bearing rod, a load-bearing rod sleeve, a horizontal cylinder, and a horizontal reset spring. The lower end of the clamping plate is fixed to the upper side of the load-bearing rod sleeve of the upper clamping device. The upper end of the vertical distance adjustment mechanism of the clamping device is located between a pair of support plates, and the upper ends of the pair of support plates are fixed to the lower side of the load-bearing rod sleeve of the upper clamping device. The lower end of the vertical distance adjustment mechanism of the clamping device is fixed to the upper side of the load-bearing rod sleeve of the lower clamping device. One end of the horizontal cylinder is threadedly fixed to one end of the adjacent load-bearing rod sleeve. One end of the load-bearing rod extends out of the corresponding end of the load-bearing rod sleeve, and the other end of the load-bearing rod extends out of the corresponding other end of the horizontal cylinder. The pistons located on the other ends of the load-bearing rods support the corresponding... In the corresponding horizontal cylinder, the two ends of the horizontal reset spring are located between the corresponding piston side and the bottom of the horizontal cylinder, respectively; a vertical telescopic cylinder with a stop shaft is also provided at one end of the load-bearing rod, and the axial oil hole of the load-bearing rod is vertically connected to one end of the vertical telescopic cylinder with the stop shaft; the second oil supply hose connected to the lower end of the upper cylinder is divided into two paths, which are respectively connected to one end of the axial oil hole of the load-bearing rod of the upper clamping device and one end of the axial oil hole of the load-bearing rod of the lower clamping device; the third oil supply hose connected to the lower oil hole of the side wall of the lower cylinder is also divided into two paths, which are respectively connected to the cavity of the corresponding horizontal cylinder of the upper clamping device and the lower clamping device facing the load-bearing rod sleeve; corresponding rubber sealing rings are provided between the mating surfaces of the load-bearing rod and the load-bearing rod sleeve, and between the mating surfaces of the horizontal cylinder and the piston.

2. The high-power diesel engine intermediate gear shaft hoisting tool as described in claim 1, characterized in that: The manual lever locking mechanism includes an arc-shaped ratchet, a pawl, and a tension spring. The upper and lower ends of the arc-shaped ratchet are fixed to the upper part of one side of the two upright plates of the right-angled bracket. The pawl is asymmetrical V-shaped. The bottom of the asymmetrical V-shape is hinged to the other end of the manual lever. The tip of the pawl at one end of the asymmetrical V-shape is locked in the groove of the arc-shaped ratchet. The other end of the asymmetrical V-shape extends outward to a length greater than the tip of the pawl. The two ends of the tension spring are respectively connected to the middle of the tip of the pawl and one end of the manual lever.

3. The high-power diesel engine intermediate gear shaft hoisting tool as described in claim 1, characterized in that: A retaining ring is embedded in the upper end of the upper cylinder body. When the lower end of the upper plunger moves into place, the upper side of the plunger body abuts against the retaining ring. Corresponding rubber sealing rings are provided between the mating surfaces of the upper plunger and the upper cylinder body, and between the lower plunger and the lower cylinder body.

4. The lifting tool for the intermediate gear shaft of a high-power diesel engine as described in claim 1, characterized in that: When the upper plunger is at its extreme position at the top of the upper cylinder block, the horizontal oil hole is adjacent to the lower side of the upper plunger; when the lower plunger is at its extreme position at the top of the lower cylinder block, the upper oil hole on the side wall of the lower cylinder block is adjacent to the lower side of the lower plunger.

5. The lifting tool for the intermediate gear shaft of a high-power diesel engine as described in claim 1, characterized in that: The vertical telescopic cylinder of the stop shaft includes a stepped stop shaft, a vertical return spring, and a screw plug. The piston in the middle of the stepped stop shaft is embedded in the vertical hole at one end of the load-bearing rod, dividing the vertical hole into two closed cavities. One cavity is connected to the other end of the axial oil hole of the load-bearing rod. The vertical return spring is located in the other cavity, and the screw plug seals the end of the other cavity. The piston in the middle and the circumference of the vertical hole, as well as the screw plug and the end face of the vertical hole, are sealed by rubber sealing rings.

6. The lifting tool for the intermediate gear shaft of a high-power diesel engine as described in claim 1, characterized in that: The opening pressure F1 of the intermediate compression spring is greater than the maximum pressure F2 of the upper plunger reset compression spring.

7. The lifting tool for the intermediate gear shaft of a high-power diesel engine as described in claim 1, characterized in that: The vertical distance adjustment mechanism of the clamping device includes a slotted stud, an upper limit plate, a lower limit plate, and an adjusting nut. The lower end of the slotted stud is fixed to the upper middle part of the load-bearing rod sleeve of the lower clamping device, and the upper end of the slotted stud is screwed into the adjusting nut. The upper limit plate is fixed to the middle of the inner side of a pair of support plates, and the lower limit plate is fixed to the lower end port of a pair of support plates. The upper and lower sides of the adjusting nut are supported between the upper limit plate and the lower limit plate by a ring of multiple balls. The guide groove of the slotted stud is clearance-fitted with the guide key fixed at the opening of the lower limit plate.

Images