Hydraulic jacking-turning oil cylinder and rear-turning carriage applying same

Abstract

The invention relates to the technical field of hydraulic equipment, and discloses a hydraulic jacking and turning oil cylinder which comprises a supporting assembly, two connecting bases and two multi-stage hydraulic mechanisms fixedly installed between the supporting assembly and the two connecting bases, and each multi-stage hydraulic mechanism comprises a first-stage cylinder body assembly arranged in the supporting assembly and a second-stage cylinder body assembly arranged in the supporting assembly. By means of the multi-stage hydraulic mechanism and the pressure balance mechanism, pressure relief openings are formed in the outer walls of first-stage cylinder body shells of the two first-stage cylinder body assemblies, and communication of hydraulic oil in the two first-stage cylinder body assemblies is achieved through a balance barrel and a balance pipe of the pressure balance mechanism; when the vehicle hopper is in use, hydraulic oil flows between the two first-stage cylinder body assemblies through the oil passing cavity and the balance pipe, so that pressure is balanced, the vehicle hopper is stressed uniformly, abrasion of the oil cylinder and related parts is reduced, the service life of the oil cylinder is prolonged, and the effects of improving discharging efficiency and reducing equipment maintenance and replacement cost are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic equipment, in particular to a hydraulic tipping oil cylinder and a rear tipping carriage using the oil cylinder. Background Art

[0002] Rear-dump trucks are widely used in the construction and transportation sector. They utilize hydraulic tipping cylinders to tilt and unload the cargo bed. Traditional hydraulic tipping cylinders are prone to pressure imbalances in their multi-stage hydraulic mechanism during operation, resulting in uneven force distribution, impacting cylinder lifespan and even posing a risk of cylinder explosion. Furthermore, existing cylinders are inadequate in slowing the downward pressure of the cargo bed in the event of a cylinder explosion, reducing transport efficiency and safety. Therefore, improvements to hydraulic tipping cylinders are urgently needed.

[0003] Patent publication number CN110259759A discloses a hydraulic cylinder comprising a base, a cylinder barrel, a piston rod, a suspension rope, and a stabilizer frame. The cylinder barrel is mounted on top of the base and is a hollow cylindrical structure with a T-shaped cross-section. The piston rod is located within the cylinder barrel and is a T-shaped cylindrical structure. Circular holes are provided on the lower sidewall of the upper end of the cylinder barrel, symmetrically distributed on the left and right sides of the outer end of the cylinder barrel. A suspension rope is located within each circular hole in the cylinder barrel, with the top of the suspension rope connected to the bottom of the piston rod. The stabilizer frame is mounted at the lower end of the suspension rope. The present invention addresses the problems of conventional hydraulic cylinders causing instability and even tipping over when the telescopic end is subjected to an oblique extrusion force; impurities are introduced into the hydraulic cylinder during lubrication, resulting in a shortened service life; and manual lubrication of the hydraulic cylinder is uneven.

[0004] The existing technology has the following defects:

[0005] Unable to balance the pressure between the two cylinders: Traditional dual-cylinder hydraulic systems typically control each cylinder independently. After long-term use, the flow and flow rate of the hydraulic oil in the two cylinders will become inconsistent, resulting in pressure differences. This problem directly leads to uneven force on the truck bed, which not only accelerates the wear of the cylinders and related components and shortens their service life, but more seriously, excessive local pressure may cause a cylinder explosion, posing a threat to operator safety and the normal operation of the equipment. Therefore, it is necessary to set up a structure that can balance the pressure between the two cylinders to ensure that the force on the truck bed is even, significantly reduce the wear of the cylinders and related components, extend their service life, and achieve the effect of improving unloading efficiency and reducing equipment maintenance and replacement costs.

[0006] Unable to slow the bucket's downward pressure in the event of a cylinder explosion: Traditional hydraulic tipping cylinder systems lack dedicated cylinder explosion buffering devices. The instant a cylinder explosion occurs, the bucket loses its stable support and plummets under the force of gravity, causing not only waste of materials but also harm to the surrounding environment and personnel. Therefore, a cylinder explosion buffer structure is required to prevent the bucket from plummeting rapidly, preventing harm to the surrounding environment and personnel. This also reduces the risk of damage to the bucket and other vehicle components due to severe impact, thereby improving safety and reducing maintenance costs. Summary of the Invention

[0007] In view of the problems in the existing technology such as the inability to balance the pressure between the two cylinders and the inability to slow down the downward pressure speed of the truck bed when the cylinder explodes, a hydraulic top-up cylinder and a rear-tilt truck bed using the cylinder are proposed.

[0008] One aspect of the present invention provides a hydraulic tipping cylinder and a rear tipping car body using the cylinder, the purpose of which is: through the provision of a multi-stage hydraulic mechanism and a pressure balancing mechanism, the force on the car body is evenly distributed, the degree of wear of the cylinder and related components is greatly reduced, and their service life is extended, thereby achieving the effect of improving unloading efficiency and reducing equipment maintenance and replacement costs; by adding a support component, the car body is prevented from falling rapidly, preventing harm to the surrounding environment and personnel, and at the same time reducing the risk of damage to the car body and other parts of the vehicle due to severe impact, thereby achieving the effect of improving safety and reducing maintenance costs.

[0009] The technical solution of the present invention is as follows: a hydraulic tilting cylinder, comprising a support assembly and two connecting seats, and two multi-stage hydraulic mechanisms fixedly installed between the support assembly and the two connecting seats, the multi-stage hydraulic mechanism comprising a first-stage cylinder assembly disposed inside the support assembly, the first-stage cylinder assembly comprising a first-stage cylinder housing rotatably connected to the interior of the support assembly, a pressure relief port being formed on an outer wall of the first-stage cylinder housing, and a pressure balancing mechanism being provided between the two pressure relief ports;

[0010] The pressure balancing mechanism includes a balancing cylinder connected to the outer wall of the first-stage cylinder housing, an oil passage chamber is provided inside the balancing cylinder, the oil passage chamber is connected to the pressure relief port, a balancing pipe is connected between the two oil passage chambers, and a pressure-resistant component is provided on the inner wall of the oil passage chamber. The oil passage chamber and the balancing pipe are used to realize the communication of the hydraulic oil in the two first-stage cylinder assemblies.

[0011] By adopting the above scheme, through the set pressure balancing mechanism, under normal working conditions, the hydraulic oil flows smoothly in the oil chamber and the balance pipe, ensuring that the bucket can rise and fall smoothly. When the cylinder explodes, the bucket will instantly lose its supporting force and fall downward. At this time, the pressure in the first-stage cylinder assembly will change dramatically, and the pressure-resistant assembly will quickly take effect. Under the action of pressure, it will overcome the internal resistance, allowing the pressure-resistant rod to quickly enter the first-stage oil filling chamber through the pressure relief port, forming a solid barrier to prevent the rapid downward pressure of the bucket, avoiding the rapid fall of the bucket and causing serious harm to the surrounding environment and personnel. At the same time, it also greatly reduces the risk of damage to the bucket and other parts of the vehicle due to severe impact, providing reliable protection for the safe operation of the entire rear-tip compartment.

[0012] Furthermore, the pressure-resistant assembly includes a telescopic plug slidably connected to the inside of the oil-passing chamber, a telescopic spring is fixedly connected between the end of the telescopic plug away from the first-stage cylinder housing and the inner wall of the balancing cylinder, the end of the telescopic plug close to the first-stage cylinder housing is fixedly connected to a pressure-resistant rod, and the end of the balancing cylinder close to the first-stage cylinder housing is fixedly connected to a block, which is used to prevent the telescopic plug from detaching from the oil-passing chamber, and an oil-passing hole is provided on the inner wall of the telescopic plug.

[0013] By adopting the above scheme, through the set pressure-resistant components, under normal working conditions, the hydraulic system pressure is stable, the telescopic spring is in a natural state or only slightly expanded and contracted. At this time, the telescopic plug is relatively fixed in the oil chamber, and the hydraulic oil flows normally in the oil chamber through the oil hole opened on the inner wall of the telescopic plug, thereby achieving pressure balance between the two first-stage cylinder assemblies. When an unexpected situation such as a cylinder explosion occurs, the pressure in the first-stage cylinder assembly changes sharply, and the pressure is transmitted to the oil chamber through the pressure relief port, pushing the telescopic plug to overcome the elastic force of the telescopic spring and slide toward the first-stage cylinder shell. The sliding of the telescopic plug will drive the anti-pressure rod through the pressure relief port into the first-stage oil filling chamber, thereby preventing the rapid downward pressure of the truck bed.

[0014] Furthermore, the first-stage cylinder assembly also includes a first-stage oil filling chamber opened inside the first-stage cylinder shell, the first-stage oil filling chamber is connected with the oil passage chamber through a pressure relief port, the pressure-resistant rod can enter the first-stage oil filling chamber through the pressure relief port, the top and bottom of the first-stage oil filling chamber are respectively connected with a second oil delivery port and a first oil delivery port, the second oil delivery port and the first oil delivery port are both opened on the outer wall of the first-stage cylinder shell, and the second-stage cylinder assembly is arranged inside the first-stage oil filling chamber.

[0015] By adopting the above scheme, through the setting of the first-stage cylinder assembly, when the hydraulic system is started, the hydraulic oil enters the first-stage oil filling chamber from the first oil delivery port, the pressure in the chamber increases, and the second-stage cylinder assembly moves upward. If the pressures of the two first-stage cylinder assemblies are inconsistent, the hydraulic oil will flow through the oil chamber and the balance pipe to achieve pressure balance. When the truck bed needs to be lowered, the hydraulic oil flows back through the second oil delivery port, the pressure in the first-stage oil filling chamber decreases, and the second-stage cylinder assembly moves downward.

[0016] Furthermore, the secondary cylinder assembly includes a secondary cylinder housing slidably connected to the interior of the primary oil filling chamber, a secondary oil filling chamber is opened inside the secondary cylinder housing, the top and bottom of the secondary oil filling chamber are respectively connected to a return oil passage and a vertical oil delivery port, the return oil passage and the vertical oil delivery port are both opened on the outer wall of the secondary cylinder housing, the secondary oil filling chamber is connected to the primary oil filling chamber through the vertical oil delivery port, the secondary oil filling chamber is connected to the second oil delivery port through the return oil passage, and an outer cover assembly is provided inside the secondary oil filling chamber.

[0017] By adopting the above scheme, through the setting of the secondary cylinder assembly, when the hydraulic system is started, the hydraulic oil enters the primary oil filling chamber from the first oil delivery port, and the hydraulic oil flows into the secondary oil filling chamber through the vertical oil delivery port, thereby increasing the pressure in the chamber. As the pressure in the secondary oil filling chamber rises, the secondary cylinder shell slides upward in the primary oil filling chamber to achieve the lifting action. When the truck bed needs to be lowered, the hydraulic oil is discharged from the second oil delivery port. At this time, the hydraulic oil in the secondary oil filling chamber flows to the second oil delivery port through the reflux oil delivery channel, and the pressure in the chamber decreases. After the pressure decreases, the secondary cylinder shell slides downward in the primary oil filling chamber under the action of gravity and external pressure.

[0018] Furthermore, the outer cover assembly includes a piston rod slidably connected to the inside of the secondary oil filling chamber, the top of the piston rod is fixedly connected to a wrapping outer cover, the outer wall of the wrapping outer cover is fixedly connected to the outer wall of the connecting seat, the wrapping outer cover is provided with an embedding groove on a side close to the second oil delivery port, and the inner wall of the wrapping outer cover is provided with an extrusion groove.

[0019] Furthermore, the outer wall of the first-stage cylinder housing is fixedly connected to a pull rod frame, and the outer wall of the pull rod frame is rotatably connected to a swing plate. When the wrapping cover is recovered, the swing plate will be squeezed through the extrusion groove to make it close to the pull rod frame. The wrapping cover can wrap the pull rod frame and the swing plate inside it.

[0020] Furthermore, the outer walls of the first-stage cylinder housing, the second-stage cylinder housing and the piston rod are all fixedly connected with sealing rings.

[0021] By adopting the above scheme, through the outer cover assembly, when the secondary cylinder assembly rises, the hydraulic oil enters the secondary oil filling chamber, pushing the piston rod to slide upward in the secondary oil filling chamber, and the wrapping outer cover rises accordingly. At this time, the pull rod frame and the swing plate are exposed to the outside. When the secondary cylinder assembly descends and the wrapping outer cover is recovered, the extrusion groove on its inner wall will squeeze the swing plate, causing the swing plate to rotate around the pull rod frame and approach the pull rod frame. Finally, the wrapping outer cover wraps the pull rod frame and the swing plate inside to play a protective role. The sealing ring can effectively prevent the hydraulic oil from leaking from the connection gaps of the components, thereby ensuring the pressure stability in the hydraulic system.

[0022] Furthermore, the support assembly includes a support base arranged at the bottom of the first-stage cylinder housing, the inner wall of the support base is fixedly connected to a rubber pad, the base of the first-stage cylinder housing is arranged on the rubber pad, the inner wall of the support base is fixedly connected to a connecting shaft, and the outer wall of the connecting shaft is rotatably connected to the inner wall of the first-stage cylinder housing.

[0023] Furthermore, a guide groove is provided on the outer wall of the support base, and the guide groove is used to limit the swing range of the swing plate.

[0024] By adopting the above scheme, through the support assembly, when the first-stage cylinder assembly generates vibration during operation, the rubber pad can absorb and disperse the vibration energy, reduce the impact on the frame, and avoid damage caused by rigid collision. The guide groove opened on the outer wall of the support base limits the swing range of the swing plate. The swing plate will swing during the process of wrapping the outer cover, recovering and squeezing. The guide groove ensures that the swing of the swing plate will not exceed a reasonable range, thereby maintaining the stability and safety of the entire system. When a cylinder explosion occurs, the vertical swing plate can assist in preventing the rapid downward pressure of the bucket.

[0025] On the other hand, the present invention provides a rear-tip car body using a hydraulic tipping cylinder, including a hydraulic tipping cylinder, a frame and a truck bed, wherein the outer wall of the frame is fixedly connected to the bottom of the support base, and the outer wall of the truck bed is fixedly connected to the outer wall of the connecting seat.

[0026] Beneficial effects of the present invention:

[0027] 1. Through the multi-stage hydraulic mechanism and pressure balancing mechanism, the outer wall of the first-stage cylinder shell of the two first-stage cylinder assemblies is provided with a pressure relief port, and the hydraulic oil in the two first-stage cylinder assemblies is connected through the balancing cylinder and balancing pipe of the pressure balancing mechanism. When the pressure of the two cylinders is inconsistent, the hydraulic oil will flow between the two first-stage cylinder assemblies through the oil chamber and the balancing pipe, thereby balancing the pressure, making the truck box evenly stressed, reducing the wear of the cylinder and related components, extending their service life, and achieving the effect of improving unloading efficiency and reducing equipment maintenance and replacement costs.

[0028] 2. Through the multi-stage hydraulic mechanism and pressure balancing mechanism, the hydraulic oil can flow normally through the oil hole during normal operation. When the cylinder explodes, the truck bed loses its supporting force and falls downward. At this time, the pressure in the first-stage cylinder assembly changes. Under the action of pressure, the telescopic plug overcomes the elastic force of the telescopic spring and slides toward the first-stage cylinder shell. The anti-compression rod enters the first-stage oil filling chamber through the pressure relief port, blocking the rapid downward pressure of the truck bed, preventing the rapid fall of the truck bed from causing harm to the surrounding environment and personnel, and reducing the risk of damage to the truck bed and other vehicle components due to severe impact.

[0029] 3. Through the support assembly, when the first-stage cylinder assembly generates vibration during operation, the rubber pad can absorb and disperse the vibration energy, reduce the impact on the frame, and avoid damage caused by rigid collision. The guide groove opened on the outer wall of the support base limits the swing range of the swing plate. The swing plate will swing during the process of wrapping the outer cover, recycling and squeezing. The guide groove ensures that the swing of the swing plate will not exceed a reasonable range, maintaining the stability and safety of the entire system. When a cylinder explosion occurs, the vertical swing plate can help prevent the rapid downward pressure of the bucket. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of the hydraulic tipping cylinder and rear tipping compartment of the present invention;

[0031] Figure 2 This is a schematic diagram of the overall structure of the hydraulic tipping cylinder of the present invention;

[0032] Figure 3 It is a structural schematic diagram of the pull rod frame of the present invention;

[0033] Figure 4 This is a structural diagram of the first-stage cylinder assembly of the present invention;

[0034] Figure 5 This is a structural schematic diagram of the secondary cylinder assembly of the present invention;

[0035] Figure 6 It is a structural schematic diagram of the outer cover assembly of the present invention;

[0036] Figure 7 It is a structural schematic diagram of the multi-stage hydraulic mechanism of the present invention;

[0037] Figure 8 This is a structural diagram of the support assembly of the present invention;

[0038] Figure 9 For the present invention Figure 8 The structural diagram of the enlarged part at A in the middle;

[0039] Figure 10 It is a structural schematic diagram of the pressure balancing mechanism of the present invention;

[0040] Figure 11 It is a schematic diagram of the movement process of the compression rod of the present invention.

[0041] In the picture:

[0042] 1. Vehicle frame; 2. Vehicle bed; 3. Connecting seat; 4. Support assembly; 41. Support base; 42. Rubber pad; 43. Connecting shaft; 44. Guide groove; 5. Multi-stage hydraulic mechanism; 51. Drawbar frame; 52. Swing plate; 53. First-stage cylinder assembly; 531. First-stage cylinder housing; 532. First oil delivery port; 533. First-stage oil filling chamber; 534. Pressure relief port; 535. Second oil delivery port; 54. Second-stage cylinder assembly; 541. Second-stage cylinder housing ; 542. Vertical oil delivery port; 543. Secondary oil filling chamber; 544. Return oil delivery channel; 55. Outer cover assembly; 551. Piston rod; 552. Wrapped outer cover; 553. Embedded groove; 554. Extrusion groove; 56. Sealing ring; 6. Pressure balancing mechanism; 61. Balancing cylinder; 62. Telescopic spring; 63. Oil passage chamber; 64. Anti-pressure assembly; 641. Telescopic plug; 642. Oil passage hole; 643. Anti-pressure rod; 65. Stopper; 66. Balance pipe. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0044] Example 1, with reference to Figures 1-11 , which is the first embodiment of the present invention, provides a hydraulic flip cylinder, including a support assembly 4 and two connecting seats 3, and two multi-stage hydraulic mechanisms 5 fixedly installed between the support assembly 4 and the two connecting seats 3, the multi-stage hydraulic mechanism 5 includes a first-stage cylinder assembly 53 arranged inside the support assembly 4, the first-stage cylinder assembly 53 includes a first-stage cylinder shell 531 rotatably connected to the inside of the support assembly 4, the outer wall of the first-stage cylinder shell 531 is provided with a pressure relief port 534, and a pressure balancing mechanism 6 is provided between the two pressure relief ports 534.

[0045] Reference Figures 9-11 The pressure balancing mechanism 6 includes a balancing cylinder 61 connected to the outer wall of the first-stage cylinder housing 531. An oil passage chamber 63 is provided inside the balancing cylinder 61. The oil passage chamber 63 is connected to the pressure relief port 534. A balancing pipe 66 is connected between the two oil passage chambers 63. A pressure-resistant component 64 is provided on the inner wall of the oil passage chamber 63. The oil passage chamber 63 and the balancing pipe 66 are used to realize the connection of the hydraulic oil in the two first-stage cylinder assemblies 53.

[0046] Specifically, the first-stage cylinder housing 531 rotates inside the support assembly 4, so that the first-stage cylinder housing 531 can be flexibly adjusted according to the movement state of the vehicle bucket 2 during operation to adapt to different work requirements; the pressure relief port 534 opened on the outer wall of the first-stage cylinder housing 531 can release pressure in time when abnormal pressure occurs in the hydraulic system, thereby ensuring safe and stable operation of the system.

[0047] Through the set pressure balancing mechanism 6, under normal working conditions, the hydraulic oil flows smoothly in the oil chamber 63 and the balance pipe 66, ensuring that the bucket 2 can rise and fall smoothly. When the cylinder explodes, the bucket 2 will instantly lose its supporting force and fall downward. At this time, the pressure in the first-stage cylinder assembly 53 will change dramatically, and the pressure-resistant assembly 64 will quickly take effect, overcoming the internal resistance under the action of pressure, so that the pressure-resistant rod 643 quickly enters the first-stage oil filling chamber 533 through the pressure relief port 534, forming a solid barrier to prevent the rapid downward pressure of the bucket 2, avoiding the rapid fall of the bucket 2 and causing serious harm to the surrounding environment and personnel. At the same time, it also greatly reduces the risk of damage to the bucket 2 and other parts of the vehicle due to severe impact, providing reliable protection for the safe operation of the entire rear-tip compartment.

[0048] Reference Figures 9-11 The anti-pressure component 64 includes a telescopic plug 641 slidably connected to the inside of the oil passage chamber 63, a telescopic spring 62 is fixedly connected between the end of the telescopic plug 641 away from the first-stage cylinder housing 531 and the inner wall of the balance cylinder 61, the end of the telescopic plug 641 close to the first-stage cylinder housing 531 is fixedly connected to a pressure-resistant rod 643, and the end of the balance cylinder 61 close to the first-stage cylinder housing 531 is fixedly connected to a stopper 65, which is used to prevent the telescopic plug 641 from detaching from the oil passage chamber 63, and an oil passage hole 642 is provided on the inner wall of the telescopic plug 641.

[0049] Specifically, the telescopic spring 62 has good elasticity. Under normal working conditions, it can maintain the telescopic plug 641 in the appropriate position, ensuring that the hydraulic oil can flow normally in the oil chamber 63. When the pressure in the hydraulic system changes slightly, the telescopic spring 62 will undergo corresponding telescopic deformation to adapt to the pressure fluctuation and ensure the stability of the system.

[0050] Through the anti-pressure component 64, under normal working conditions, the hydraulic system pressure is stable, and the telescopic spring 62 is in a natural state or has only a small extension and contraction. At this time, the telescopic plug 641 is relatively fixed in the oil chamber 63, and the hydraulic oil flows normally in the oil chamber 63 through the oil hole 642 opened on the inner wall of the telescopic plug 641, thereby achieving pressure balance between the two first-level cylinder assemblies 53. When an accident such as a cylinder explosion occurs, the pressure in the first-level cylinder assembly 53 changes sharply, and the pressure is transmitted to the oil chamber 63 through the pressure relief port 534, pushing the telescopic plug 641 to overcome the elastic force of the telescopic spring 62 and slide toward the first-level cylinder housing 531. The sliding of the telescopic plug 641 will drive the anti-pressure rod 643 to enter the first-level oil filling chamber 533 through the pressure relief port 534, thereby preventing the truck bed 2 from being pressed down quickly.

[0051] Reference Figure 3-Figure 5 The first-stage cylinder assembly 53 also includes a first-stage oil filling chamber 533 opened inside the first-stage cylinder shell 531. The first-stage oil filling chamber 533 is connected to the oil passage chamber 63 through the pressure relief port 534. The pressure-resistant rod 643 can enter the first-stage oil filling chamber 533 through the pressure relief port 534. The top and bottom of the first-stage oil filling chamber 533 are respectively connected to the second oil delivery port 535 and the first oil delivery port 532. The second oil delivery port 535 and the first oil delivery port 532 are both opened on the outer wall of the first-stage cylinder shell 531. The second-stage cylinder assembly 54 is arranged inside the first-stage oil filling chamber 533.

[0052] Through the provision of the first-stage cylinder assembly 53, when the hydraulic system is started, the hydraulic oil enters the first-stage oil filling chamber 533 from the first oil delivery port 532, the pressure in the chamber increases, and the second-stage cylinder assembly 54 moves upward. If the pressures of the two first-stage cylinder assemblies 53 are inconsistent, the hydraulic oil will flow through the oil chamber 63 and the balance pipe 66 to achieve pressure balance. When the truck bed 2 needs to be lowered, the hydraulic oil flows back through the second oil delivery port 535, the pressure in the first-stage oil filling chamber 533 decreases, and the second-stage cylinder assembly 54 moves downward.

[0053] Reference Figure 4-Figure 6 The secondary cylinder assembly 54 includes a secondary cylinder housing 541 which is slidably connected to the interior of the primary oil filling chamber 533. A secondary oil filling chamber 543 is provided inside the secondary cylinder housing 541. The top and bottom of the secondary oil filling chamber 543 are respectively connected to a return oil passage 544 and a vertical oil delivery port 542. The return oil passage 544 and the vertical oil delivery port 542 are both provided on the outer wall of the secondary cylinder housing 541. The secondary oil filling chamber 543 is connected to the primary oil filling chamber 533 through the vertical oil delivery port 542. The secondary oil filling chamber 543 is connected to the second oil delivery port 535 through the return oil passage 544. An outer cover assembly 55 is provided inside the secondary oil filling chamber 543.

[0054] Through the set secondary cylinder assembly 54, when the hydraulic system is started, the hydraulic oil enters the primary oil filling chamber 533 from the first oil delivery port 532, and the hydraulic oil flows into the secondary oil filling chamber 543 through the vertical oil delivery port 542, thereby increasing the pressure in the chamber. As the pressure in the secondary oil filling chamber 543 rises, the secondary cylinder housing 541 slides upward in the primary oil filling chamber 533 to achieve the lifting action. When the truck bed 2 needs to be lowered, the hydraulic oil is discharged from the second oil delivery port 535. At this time, the hydraulic oil in the secondary oil filling chamber 543 flows to the second oil delivery port 535 through the reflux oil delivery channel 544, and the pressure in the chamber decreases. After the pressure decreases, the secondary cylinder housing 541 slides downward in the primary oil filling chamber 533 under the action of gravity and external pressure.

[0055] Reference Figure 5-Figure 6 The outer cover assembly 55 includes a piston rod 551 slidably connected to the inside of the secondary oil filling chamber 543, and the top of the piston rod 551 is fixedly connected to a wrapping outer cover 552, the outer wall of the wrapping outer cover 552 is fixedly connected to the outer wall of the connecting seat 3, and an embedding groove 553 is provided on the side of the wrapping outer cover 552 close to the second oil delivery port 535, and an extrusion groove 554 is provided on the inner wall of the wrapping outer cover 552. The outer wall of the primary cylinder body shell 531 is fixedly connected to the pull rod frame 51, and the outer wall of the pull rod frame 51 is rotatably connected to the swing plate 52. When the wrapping outer cover 552 is recovered, the swing plate 52 will be squeezed through the extrusion groove 554 to make it close to the pull rod frame 51. The wrapping outer cover 552 can wrap the pull rod frame 51 and the swing plate 52 inside it, and the outer walls of the primary cylinder body shell 531, the secondary cylinder body shell 541 and the piston rod 551 are all fixedly connected with a sealing ring 56.

[0056] Through the provided outer cover assembly 55, when the secondary cylinder assembly 54 rises, the hydraulic oil enters the secondary oil filling chamber 543, pushing the piston rod 551 to slide upward in the secondary oil filling chamber 543, and the wrapping outer cover 552 rises accordingly. At this time, the pull rod frame 51 and the swing plate 52 are exposed to the outside. When the secondary cylinder assembly 54 descends, the wrapping outer cover 552 is recovered, and the extrusion groove 554 opened on its inner wall will squeeze the swing plate 52, causing the swing plate 52 to rotate around the pull rod frame 51 and approach the pull rod frame 51. Finally, the wrapping outer cover 552 wraps the pull rod frame 51 and the swing plate 52 inside to play a protective role. The sealing ring 56 can effectively prevent the hydraulic oil from leaking from the connection gaps of the components, thereby ensuring the pressure stability in the hydraulic system.

[0057] Reference Figure 8The support assembly 4 includes a support base 41 arranged at the bottom of the first-stage cylinder housing 531, the inner wall of the support base 41 is fixedly connected with a rubber pad 42, the base of the first-stage cylinder housing 531 is set on the rubber pad 42, the inner wall of the support base 41 is fixedly connected with a connecting shaft 43, the outer wall of the connecting shaft 43 is rotatably connected to the inner wall of the first-stage cylinder housing 531, and the outer wall of the support base 41 is provided with a guide groove 44, which is used to limit the swing range of the swing plate 52.

[0058] Through the support assembly 4, when the first-stage cylinder assembly 53 generates vibration during operation, the rubber pad 42 can absorb and disperse the vibration energy, reduce the impact on the frame 1, and avoid damage caused by rigid collision. The guide groove 44 opened on the outer wall of the support base 41 limits the swing range of the swing plate 52. The swing plate 52 will swing during the process of wrapping the outer cover 552, recovering and squeezing. The guide groove 44 ensures that the swing of the swing plate 52 will not exceed a reasonable range, maintaining the stability and safety of the entire system. When a cylinder explosion occurs, the vertical swing plate 52 can assist in preventing the rapid downward pressure of the bucket 2.

[0059] During use, when the hydraulic system is working, the hydraulic oil enters the primary oil filling chamber 533 through the first oil delivery port 532, pushing the secondary cylinder assembly 54 to move upward, and the secondary cylinder housing 541 in the secondary cylinder assembly 54 slides in the primary oil filling chamber 533. The secondary oil filling chamber 543 is connected with the primary oil filling chamber 533 through the vertical oil delivery port 542, so that the hydraulic oil can enter the secondary oil filling chamber 543. The hydraulic oil entering the secondary oil filling chamber 543 pushes the piston rod 551 in the outer cover assembly 55 to move upward, and the wrapped outer cover 552 on the top of the piston rod 551 is fixedly connected to the connecting seat 3, thereby realizing the lifting of the truck bed 2. When the truck bed 2 needs to be lowered, the hydraulic oil returns through the second oil delivery port 535 and the reflux oil delivery channel 544, causing the secondary cylinder assembly 54 and the outer cover assembly 55 to move downward, and the truck bed 2 drops. The outer wall of the primary cylinder housing 531 of the two primary cylinder assemblies 53 is provided with a pressure relief port 534 The hydraulic oil in the two primary cylinder assemblies 53 is connected through the balancing cylinder 61 and the balancing pipe 66 of the pressure balancing mechanism 6. When the pressures in the two cylinders are inconsistent, the hydraulic oil will flow between the two primary cylinder assemblies 53 through the oil passage chamber 63 and the balancing pipe 66, thereby balancing the pressure, making the bucket 2 evenly stressed, and reducing the wear of the cylinders and related components. During normal operation, the hydraulic oil can flow normally through the oil passage hole 642. When a cylinder explosion occurs, the bucket 2 loses its supporting force and falls downward. At this time, the pressure in the primary cylinder assembly 53 changes, and the telescopic plug 641 overcomes the elastic force of the telescopic spring 62 under the action of pressure and slides toward the primary cylinder housing 531. The anti-compression rod 643 enters the first oil filling chamber 533 through the pressure relief port 534, blocking the rapid downward pressure of the bucket 2, preventing the bucket 2 from falling rapidly and causing harm to the surrounding environment and personnel, while reducing the risk of damage to the bucket 2 and other vehicle components due to severe impact.

[0060] Example 2, reference Figures 1-11 , which is the second embodiment of the present invention, provides a rear-tip car body using a hydraulic top-tip cylinder, including a hydraulic top-tip cylinder, a frame 1 and a car body 2, wherein the outer wall of the frame 1 is fixedly connected to the bottom of the support base 41, and the outer wall of the car body 2 is fixedly connected to the outer wall of the connecting seat 3

[0061] Working principle of the present invention:

[0062] When the hydraulic system is working, the hydraulic oil enters the primary oil filling chamber 533 through the first oil delivery port 532, pushing the secondary cylinder assembly 54 to move upward. The secondary cylinder housing 541 in the secondary cylinder assembly 54 slides in the primary oil filling chamber 533. The secondary oil filling chamber 543 is connected to the primary oil filling chamber 533 through the vertical oil delivery port 542, so that the hydraulic oil can enter the secondary oil filling chamber 543.

[0063] The hydraulic oil entering the secondary oil filling chamber 543 pushes the piston rod 551 in the outer cover assembly 55 to move upward, and the wrapped outer cover 552 on the top of the piston rod 551 is fixedly connected to the connecting seat 3, thereby realizing the lifting of the truck bed 2. When the truck bed 2 needs to be lowered, the hydraulic oil flows back through the second oil delivery port 535 and the return oil delivery channel 544, causing the secondary cylinder assembly 54 and the outer cover assembly 55 to move downward, and the truck bed 2 is lowered.

[0064] A pressure relief port 534 is provided on the outer wall of the first-stage cylinder housing 531 of the two first-stage cylinder assemblies 53, and the hydraulic oil in the two first-stage cylinder assemblies 53 is connected through the balancing cylinder 61 and the balancing pipe 66 of the pressure balancing mechanism 6. When the pressures of the two cylinders are inconsistent, the hydraulic oil will flow between the two first-stage cylinder assemblies 53 through the oil chamber 63 and the balancing pipe 66, thereby balancing the pressure, making the truck box 2 evenly stressed, and reducing the wear of the cylinder and related components.

[0065] During normal operation, the hydraulic oil can flow normally through the oil hole 642. When a cylinder explosion occurs, the bucket 2 loses its supporting force and falls downward. At this time, the pressure in the first-stage cylinder assembly 53 changes. The telescopic plug 641 overcomes the elastic force of the telescopic spring 62 under the action of pressure and slides toward the first-stage cylinder housing 531. The compression rod 643 enters the first-stage oil filling chamber 533 through the pressure relief port 534, blocking the rapid downward pressure of the bucket 2, preventing the bucket 2 from falling rapidly and causing harm to the surrounding environment and personnel, while reducing the risk of damage to the bucket 2 and other parts of the vehicle due to severe impact.

[0066] The support base 41 supports the first-stage cylinder housing 531 through the rubber pad 42, which plays a role in buffering and shock absorption. The connecting shaft 43 enables the first-stage cylinder housing 531 to rotate to adapt to the movement of the truck bed 2. At the same time, when the wrapping cover 552 is recovered, the swing plate 52 is squeezed through the extrusion groove 554 to make it close to the pull rod frame 51. The wrapping cover 552 wraps the pull rod frame 51 and the swing plate 52 inside, which plays a certain protection and auxiliary storage role. In addition, when the cylinder explodes, the vertical swing plate 52 can help prevent the rapid downward pressure of the truck bed 2.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A hydraulic tilting cylinder comprising a support assembly and two connecting seats, and two multi-stage hydraulic mechanisms fixedly mounted between the support assembly and the two connecting seats, characterized in that: The multi-stage hydraulic mechanism includes a first-stage cylinder assembly disposed inside the support assembly, the first-stage cylinder assembly includes a first-stage cylinder housing rotatably connected to the interior of the support assembly, a pressure relief port is provided on the outer wall of the first-stage cylinder housing, and a pressure balancing mechanism is provided between the two pressure relief ports; The pressure balancing mechanism includes a balancing cylinder connected to the outer wall of the first-stage cylinder housing, an oil passage chamber is provided inside the balancing cylinder, the oil passage chamber is connected to the pressure relief port, a balancing pipe is connected between the two oil passage chambers, and a pressure-resistant component is provided on the inner wall of the oil passage chamber. The oil passage chamber and the balancing pipe are used to realize the communication of the hydraulic oil in the two first-stage cylinder assemblies.

2. The hydraulic tipping cylinder according to claim 1, characterized in that: The anti-pressure component includes a telescopic plug slidably connected to the inside of the oil passage chamber, a telescopic spring is fixedly connected between the end of the telescopic plug away from the primary cylinder housing and the inner wall of the balancing cylinder, the end of the telescopic plug close to the primary cylinder housing is fixedly connected to a pressure-resistant rod, and the end of the balancing cylinder close to the primary cylinder housing is fixedly connected to a block, which is used to prevent the telescopic plug from detaching from the oil passage chamber, and an oil passage hole is provided on the inner wall of the telescopic plug.

3. The hydraulic tipping cylinder according to claim 2, characterized in that: The first-stage cylinder assembly also includes a first-stage oil filling chamber opened inside the first-stage cylinder shell, the first-stage oil filling chamber is connected to the oil passage chamber through a pressure relief port, the pressure-resistant rod can enter the first-stage oil filling chamber through the pressure relief port, the top and bottom of the first-stage oil filling chamber are respectively connected to a second oil delivery port and a first oil delivery port, the second oil delivery port and the first oil delivery port are both opened on the outer wall of the first-stage cylinder shell, and the second-stage cylinder assembly is arranged inside the first-stage oil filling chamber.

4. The hydraulic tipping cylinder according to claim 3, characterized in that: The secondary cylinder assembly includes a secondary cylinder housing slidably connected to the interior of the primary oil filling chamber, a secondary oil filling chamber is opened inside the secondary cylinder housing, the top and bottom of the secondary oil filling chamber are respectively connected to a return oil passage and a vertical oil delivery port, the return oil passage and the vertical oil delivery port are both opened on the outer wall of the secondary cylinder housing, the secondary oil filling chamber is connected to the primary oil filling chamber through the vertical oil delivery port, the secondary oil filling chamber is connected to the second oil delivery port through the return oil passage, and an outer cover assembly is provided inside the secondary oil filling chamber.

5. The hydraulic tipping cylinder according to claim 4, characterized in that: The outer cover assembly includes a piston rod slidably connected to the inside of the secondary oil filling chamber, the top of the piston rod is fixedly connected to a wrapping outer cover, the outer wall of the wrapping outer cover is fixedly connected to the outer wall of the connecting seat, the wrapping outer cover is provided with an embedding groove on a side close to the second oil delivery port, and the inner wall of the wrapping outer cover is provided with an extrusion groove.

6. The hydraulic tipping cylinder according to claim 5, characterized in that: The outer wall of the first-stage cylinder shell is fixedly connected to a pull rod frame, and the outer wall of the pull rod frame is rotatably connected to a swing plate. When the wrapping cover is recovered, the swing plate will be squeezed through the extrusion groove to make it close to the pull rod frame. The wrapping cover can wrap the pull rod frame and the swing plate inside it.

7. The hydraulic tipping cylinder according to claim 6, characterized in that: The outer walls of the first-stage cylinder housing, the second-stage cylinder housing and the piston rod are all fixedly connected with sealing rings.

8. The hydraulic tipping cylinder according to claim 1, characterized in that: The support assembly includes a support base arranged at the bottom of the first-stage cylinder housing, the inner wall of the support base is fixedly connected to a rubber pad, the base of the first-stage cylinder housing is arranged on the rubber pad, the inner wall of the support base is fixedly connected to a connecting shaft, and the outer wall of the connecting shaft is rotatably connected to the inner wall of the first-stage cylinder housing.

9. The hydraulic tipping cylinder according to claim 8, characterized in that: A guide groove is provided on the outer wall of the support base, and the guide groove is used to limit the swing range of the swing plate.

10. A rear-tilt vehicle body using a hydraulic tilting cylinder, characterized in that: It includes the hydraulic tipping cylinder according to claim 9, and also includes a frame and a bucket, the outer wall of the frame is fixedly connected to the bottom of the support base, and the outer wall of the bucket is fixedly connected to the outer wall of the connecting seat.

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