Adjustable hydraulic oil cylinder for tilting cart

Abstract

The adjustable hydraulic oil cylinder comprises a cylinder body, the bottom of the cylinder body is fixedly connected with a second lug ring, the outer surface of the cylinder body is slidably sleeved with a lifting cylinder, the two sides of the lifting cylinder are each provided with a limiting mechanism, and the two sides of the lifting cylinder are each provided with a first notch; second notches are formed in the other two sides of the lifting cylinder. By means of a linkage mechanism of the piston rod, it is ensured that the lifting frame stably ascends and descends along the track of the ejector rod, the connecting block serves as a key component, the piston rod and the ejector rod are connected, the lifting process of the lifting frame is guided, under transmission of the belt, the driving wheel and the driven wheel synchronously rotate, the belt stably slides under constraint of the clamp, and position deviation is prevented; inclination of the lifting frame is effectively limited through the fixing rods, vertical movement is guaranteed, abrasion and faults are avoided, the precision and stability of the lifting device are improved through the whole system structural design, and the service life of the lifting device is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of dump truck equipment, in particular to an adjustable hydraulic cylinder used for a dump truck. Background Art

[0002] A dump truck is a special vehicle with a tipping bucket for short-distance material transportation. A "bucket"-shaped container is installed on the vehicle body, which can be turned over for easy unloading. It is suitable for short-distance transportation of various bulk materials such as sand, gravel, earth, coal, ore, etc. It has strong power and usually has a mechanical dumping function. Hydraulic cylinders are required to realize the dumping function and control the unloading speed and angle.

[0003] For example, the "an adjustable buffer hydraulic cylinder" with publication number: CN219035195U can automatically increase the return oil resistance of the hydraulic oil when the piston is close to the upper and lower ends of the cylinder chamber, and buffer the piston through the return oil resistance. It is less affected by the outside world, has a long service life, high reliability and good buffering effect; it includes a cylinder body, an oil pipe A, an oil pipe B, a piston and a push rod, a chamber is arranged inside the cylinder body, the oil pipe A and the oil pipe B are respectively installed at the upper and lower parts of the cylinder body, the oil pipe A and the oil pipe B are communicated with the chamber of the cylinder body, the piston is installed in the chamber of the cylinder body for up and down sliding, the piston and the cylinder body are in a sealed sliding connection, the push rod is fixedly installed on the upper end of the piston, and the upper part of the push rod is installed on the cylinder body for up and down sliding; it also includes two groups of sealing partitions and two groups of conical blocks.

[0004] However, in the prior art, dump trucks are easily affected by various external forces during operation, which can cause the piston rod to be skewed. For example, the bumps and vibrations of the vehicle can easily cause the hydraulic cylinder to be subjected to lateral force, thereby causing the piston rod to be skewed. In addition, when the carriage is loading and unloading goods, if the distribution of the goods is uneven or the impact force of the goods during unloading is too large, it is also easy to generate lateral force on the hydraulic cylinder, causing the piston rod to be skewed. The skewed piston rod will cause uneven force on the seals between it and the cylinder head or other sealing parts. When the piston rod is skewed, one side of the seal will be subjected to greater pressure, thereby accelerating the wear of the seal. Once the seal is severely worn, it will cause hydraulic oil leakage, affecting the normal operation of the hydraulic cylinder. Summary of the invention

[0005] The object of the present invention is to provide an adjustable hydraulic cylinder for a dump truck to solve the problem mentioned in the above background technology that the skewed piston rod will cause uneven force on the seals between it and the cylinder head or other sealing parts. When the piston rod is skewed, one side of the seal will be subjected to greater pressure, thereby accelerating the wear of the seal.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an adjustable hydraulic oil cylinder for a dump truck, comprising a cylinder body, a second earring is fixedly connected to the bottom of the cylinder body, a lifting cylinder is slidably sleeved on the outer surface of the cylinder body, a limiting mechanism is installed on both sides of the lifting cylinder, a first notch is opened on both sides of the lifting cylinder, and a second notch is opened on the other two sides of the lifting cylinder, and a calibration mechanism is installed on the top of the cylinder body;

[0007] The limiting mechanism includes a push rod and a lifting frame, the push rod is located in the inner cavity of the lifting cylinder, and the outer surfaces of both ends of the push rod are fixedly connected to the top of the lifting frame, a first limiting hole is opened in the middle of the lifting frame, a fixing rod is slidably connected to the top of the inner cavity of the first limiting hole, and one end of the fixing rod is fixedly connected to a second clamp, a first clamp is provided on one side of the bottom end of the lifting cylinder, a bottom rod is fixedly connected to one side of the bottom end of the lifting frame, the outer surface of one end of the bottom rod is rotatably connected to a driven wheel, and the outer surfaces of both ends of the push rod are rotatably connected to a driving wheel, a belt is sleeved on the surface of the driving wheel, and the bottom end of the belt is sleeved on the outer surface of the driven wheel.

[0008] Preferably, the belt passes through the first clamp and the second clamp respectively, the first earring is fixedly connected to the top of the lifting cylinder, and fixed plates are fixedly connected on both sides of the lifting cylinder. The two fixed plates are respectively located on both sides of the first notch, the lifting frame is located between the two fixed plates, and the first clamp is fixedly connected to the fixed plate.

[0009] Preferably, the calibration mechanism comprises a shell, a fixing frame is fixedly connected to the inner side of the shell, a rotating frame is arranged above the fixing frame, a second limiting hole is opened on the outer side of the fixing frame, and a moving rod is slidably connected to the inner side of the second limiting hole.

[0010] Preferably, a plurality of calibration frames are arranged above the fixed frame, the bottom of one end of the calibration frame is fixedly connected to the top of the moving rod, and the top of one end of the calibration frame is fixedly connected to the driving rod.

[0011] Preferably, a spiral sleeve is fixedly connected to the middle of the rotating frame, and the spiral sleeve is rotatably connected to the outer shell. A plurality of rotating arms are arranged on the outer side of the spiral sleeve, and a driving hole is opened on the surface of the rotating arm, and the driving hole is slidably connected to the driving rod.

[0012] Preferably, a baffle is fixedly connected to the top of the driving rod, the diameter of the baffle is larger than the width of the driving hole, a plurality of mounting grooves are opened on the inner side of the calibration frame, and a ball is movably connected to the inner side of the mounting groove.

[0013] Preferably, a second oil inlet is provided at the center of the cylinder side wall, a first oil inlet is provided at the top of the cylinder side wall, a third oil inlet is provided at the bottom of the cylinder side wall, and a movable rod is provided in the inner cavity of the cylinder.

[0014] Preferably, a second movable cylinder is provided on the outer surface of the top end of the movable rod, and a first movable cylinder is provided on the outer surface of the bottom end of the movable rod, both ends of the movable rod are fixedly connected to limiting plates, one of the limiting plates is fixedly connected to the top end of a piston rod, the top end of the piston rod is fixedly connected to a connecting block, and the connecting block is fixedly connected to the middle part of the top rod.

[0015] Preferably, the outer surfaces of the second movable cylinder and the first movable cylinder at opposite ends are fixedly connected with connecting rings, the outer surface of one end of the connecting ring is clamped with a supporting ring, and the outer surface of the other end of the connecting ring is clamped with a sealing ring.

[0016] Preferably, a spring is provided between the second movable cylinder and the first movable cylinder, and the spring is sleeved on the outer surface of the movable rod.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, the linkage mechanism of the piston rod ensures that the lifting frame can be lifted and lowered smoothly along the trajectory of the push rod. As a key component, the connecting block not only connects the piston rod and the push rod, but also guides the lifting process of the lifting frame. Under the transmission of the belt, the driving wheel and the driven wheel rotate synchronously, so that the belt can slide stably under the constraint of the clamp to prevent position displacement. In addition, the fixing rod effectively limits the inclination of the lifting frame, ensures vertical movement, and avoids wear and failure. The entire system structure design improves the accuracy, stability and service life of the lifting device.

[0019] 2. In the present invention, during the recovery process, the spiral connection between the bottom end of the piston rod and the spiral sleeve drives the rotating frame and the rotating arm to rotate synchronously, thereby driving the driving rod to move stably along the set path. The driving rod ensures the reliable transmission of force under the restriction of the baffle, and further drives the calibration frame to slide linearly. The multi-point contact calibration of the multi-sphere and the piston rod can adjust its verticality in real time, correct the deflection, and ensure that it maintains a straight trajectory during the lifting process, thereby improving the accuracy and reliability of the system. At the same time, it avoids unnecessary rotation in the non-maximum lifting state, effectively reduces interference, and improves the accuracy of the operation.

[0020] 3. In the present invention, the system accurately adjusts the lifting process of the piston rod through three independently controlled oil inlets, so that it can flexibly adapt to different operating requirements, thereby improving the flexibility and control accuracy of the system. The sealing ring and the support ring ensure that the oil does not leak and keep the internal pressure of the cylinder stable. At the same time, additional support is provided for the first and second movable cylinders to prevent tilting and ensure smooth lifting. The spring provides a buffer between the two movable cylinders to reduce collisions, extend the service life of the equipment and improve safety. The overall design effectively reduces parts wear, ensures smooth operation, and enhances the reliability of the equipment and operating experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of an adjustable hydraulic cylinder for a dump truck according to the present invention;

[0022] Figure 2 It is a schematic diagram of the disassembled structure of an adjustable hydraulic cylinder for a dump truck of the present invention;

[0023] Figure 3 It is a partial structural schematic diagram of an adjustable hydraulic cylinder for a dump truck of the present invention;

[0024] Figure 4 It is a schematic diagram of the disassembled structure of an adjustable hydraulic cylinder limit mechanism for a dump truck according to the present invention;

[0025] Figure 5 It is a schematic diagram of the disassembled structure of a calibration mechanism in an adjustable hydraulic cylinder for a dump truck according to the present invention;

[0026] Figure 6 This is a schematic structural diagram of a fixing frame and a calibration frame of an adjustable hydraulic cylinder for a dump truck according to the present invention;

[0027] Figure 7 This is a schematic diagram of the internal structure of a cylinder body in an adjustable hydraulic cylinder for a dump truck of the present invention;

[0028] Figure 8 The present invention is a schematic diagram of the internal structure of a cylinder body of an adjustable hydraulic cylinder for a dump truck.

[0029] In the figure: 1, cylinder body; 11, first oil inlet; 12, second oil inlet; 13, third oil inlet; 14, movable rod; 141, limit plate; 15, spring; 16, first movable cylinder; 17, piston rod; 171, connecting block; 18, connecting ring; 181, supporting ring; 182, sealing ring; 19, second movable cylinder; 2, limit mechanism; 21, fixing plate; 22, push rod; 23, driving wheel; 24, belt; 25, driven wheel; 26, fixing rod; 27, lifting frame; 271 , bottom rod; 272, first limiting hole; 28, first clamp; 29, second clamp; 3, first earring; 4, second earring; 5, lifting cylinder; 51, first notch; 52, second notch; 6, calibration mechanism; 61, housing; 62, rotating frame; 621, drive hole; 622, rotating arm; 63, spiral sleeve; 64, fixed frame; 641, second limiting hole; 65, moving rod; 66, calibration frame; 661, sphere; 662, mounting groove; 67, drive rod; 671, baffle. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1: Reference Figure 1 , Figure 2 ,and Figure 4 As shown: an adjustable hydraulic cylinder for a dump truck, comprising a cylinder body 1, a second earring 4 is fixedly connected to the bottom of the cylinder body 1, a lifting cylinder 5 is slidably sleeved on the outer surface of the cylinder body 1, a limiting mechanism 2 is installed on both sides of the lifting cylinder 5, a first notch 51 is opened on both sides of the lifting cylinder 5, and a second notch 52 is opened on the other two sides of the lifting cylinder 5, and a calibration mechanism 6 is installed on the top of the cylinder body 1;

[0032] The limiting mechanism 2 includes a push rod 22 and a lifting frame 27. The push rod 22 is located in the inner cavity of the lifting cylinder 5, and the outer surfaces of both ends of the push rod 22 are fixedly connected to the top of the lifting frame 27. A first limiting hole 272 is opened in the middle of the lifting frame 27. A fixing rod 26 is slidably connected to the top of the inner cavity of the first limiting hole 272. One end of the fixing rod 26 is fixedly connected to a second clamp 29. A first clamp 28 is provided on one side of the bottom end of the lifting cylinder 5. A bottom rod 271 is fixedly connected to one side of the bottom end of the lifting frame 27. The outer surface of one end of the bottom rod 271 is rotatably connected to a driven wheel 25. The outer surfaces of both ends of the push rod 22 are rotatably connected to a driving wheel 23. A belt 24 is sleeved on the surface of the driving wheel 23, and the bottom end of the belt 24 is sleeved on the outer surface of the driven wheel 25.

[0033] The belt 24 passes through the first clamp 28 and the second clamp 29 respectively. The first earring 3 is fixedly connected to the top of the lifting cylinder 5. Fixed plates 21 are fixedly connected on both sides of the lifting cylinder 5. The two fixed plates 21 are respectively located on both sides of the first notch 51. The lifting frame 27 is located between the two fixed plates 21. The first clamp 28 is fixedly connected to the fixed plate 21.

[0034] In this embodiment, during the entire lifting process, the lifting and lowering of the piston rod 17 drives the synchronous movement of the connecting block 171 and the push rod 22. This linkage mechanism ensures that the lifting frame 27 can effectively follow the lifting and lowering trajectory of the push rod 22. As a key connecting component, the connecting block 171 not only connects the piston rod 17 and the push rod 22, but also guides the lifting frame 27 to lift and lower smoothly. When the push rod 22 moves, the lifting frame 27 drives the driving wheel 23 and the driven wheel 25 to rotate synchronously through the transmission system of the belt 24. This synchronous rotation design ensures that the belt 24 can slide stably on the surface of the fixture during the lifting process, while avoiding position deviation.

[0035] Specifically, the first clamp 28 can move along the outer surface of the belt 24 during the lifting process, thereby providing an effective guiding effect. When the lifting frame 27 is restricted between the two fixed plates 21 for lifting, it not only drives the driven wheel 25 to lift synchronously, but also further stabilizes the lifting trajectory of the entire device through the transmission system of the belt 24. This structural design ensures that when oil is introduced into the cylinder body 1, even if the piston rod 17 and the lifting cylinder 5 have different lifting speeds, the movement of the lifting cylinder 5 will not be offset.

[0036] In addition, the relative sliding between the lifting cylinder 5 and the cylinder body 1 can ensure that the belt 24 is always kept in the correct position under the restriction of the first clamp 28 and the second clamp 29, thereby preventing the belt 24 from deflecting. At this time, the restriction of the second clamp 29 further strengthens the fixing effect of the belt 24, so that the belt 24 can maintain a precise position even in a complex lifting process.

[0037] At the same time, during the entire movement process, the relative sliding between the first limiting hole 272 and the fixing rod 26 effectively ensures that the lifting cylinder 5 and the piston rod 17 do not tilt during multiple lifting operations. The limiting effect of the fixing rod 26 enables the lifting frame 27 to always maintain vertical movement during the activity process, avoiding unnecessary wear caused by tilting. This design avoids the failure of the internal parts of the cylinder body 1 due to wear, thereby improving the reliability and service life of the entire device.

[0038] Embodiment 2: Figure 5 and Figure 6As shown, the calibration mechanism 6 includes a shell 61, a fixed frame 64 is fixedly connected to the inner side of the shell 61, a rotating frame 62 is arranged above the fixed frame 64, a second limiting hole 641 is opened on the outer side of the fixed frame 64, and a moving rod 65 is slidably connected to the inner side of the second limiting hole 641. A plurality of calibration frames 66 are arranged above the fixed frame 64, the bottom of one end of the calibration frame 66 is fixedly connected to the top of the moving rod 65, and a driving rod 67 is fixedly connected to the top of one end of the calibration frame 66. A spiral sleeve 63 is fixedly connected to the middle part of the rotating frame 62, and the spiral sleeve 63 is rotatably connected to the shell 61. A plurality of rotating arms 622 are arranged on the outer side of the spiral sleeve 63, and a driving hole 621 is opened on the surface of the rotating arm 622, and the driving hole 621 is slidably connected to the driving rod 67. A baffle 671 is fixedly connected to the top of the driving rod 67 , and the diameter of the baffle 671 is larger than the width of the driving hole 621 . A plurality of mounting grooves 662 are opened inside the calibration frame 66 , and a ball 661 is movably connected inside the mounting groove 662 .

[0039] In this embodiment, when the piston rod 17 is recovered, its bottom end is spirally connected to the spiral sleeve 63, thereby generating a spiral force, which pushes the spiral sleeve 63 to start rotating. The rotation of the spiral sleeve 63 will be transmitted to the rotating frame 62, causing it to rotate synchronously, thereby driving the rotation of the rotating arm 622. The rotation of the rotating arm 622 generates a force on the driving hole 621, which in turn applies a thrust to the connected driving rod 67. The driving rod 67 moves along the path under the action of this force, and is restricted by the baffle 671, thereby ensuring the stability of the movement and the reliability of force transmission. Under the restriction of the baffle 671, the driving rod 67 realizes the effective bearing of the force of the rotating arm 622 and the driving hole 621.

[0040] As the driving rod 67 moves, the calibration frame 66 also starts to move. A moving rod 65 is installed at the bottom of the calibration frame 66, and the moving rod 65 slides in the second limiting hole 641 to achieve the linear motion of the calibration frame 66. This linear motion ensures that the calibration frame 66 can accurately approach the piston rod 17 for further restriction and calibration.

[0041] The outer surface of the rotating frame 62 is provided with a plurality of rotating arms 622, which can drive a plurality of calibration frames 66 to move simultaneously, forming a synchronous calibration action. When these calibration frames 66 are synchronously close to the piston rod 17, multi-point restriction can be achieved, thereby improving the effect and accuracy of calibration.

[0042] When the piston rod 17 contacts the ball 661 of the calibration frame 66, if the piston rod 17 is in a vertical state, the ball 661 will slide relative to it without causing additional interference. However, if the piston rod 17 is skewed, the ball 661 will apply an adjustment force to it to ensure that the movement of the piston rod 17 remains on a straight line. This design, through the adjustment of multiple balls 661, allows the piston rod 17 to gradually restore linear motion even if it is skewed during lifting, ensuring stable operation of the system.

[0043] In addition, during the lifting process of the piston rod 17, if the maximum lifting stage is not reached, the spiral groove at the bottom will not contact the spiral sleeve 63, thereby avoiding unnecessary rotation. This design can prevent the piston rod 17 from generating unnecessary rotation when it is in the middle position, effectively reduce interference, and improve the accuracy of operation.

[0044] Embodiment 3: According to Figure 3 , Figure 7 and Figure 8 As shown, a second oil inlet 12 is provided at the center of the side wall of the cylinder body 1, a first oil inlet 11 is provided at the top of the side wall of the cylinder body 1, a third oil inlet 13 is provided at the bottom of the side wall of the cylinder body 1, and a movable rod 14 is provided in the inner cavity of the cylinder body 1. A second movable cylinder 19 is provided on the outer surface of the top end of the movable rod 14, and a first movable cylinder 16 is provided on the outer surface of the bottom end of the movable rod 14. Both ends of the movable rod 14 are fixedly connected to limit plates 141, one of the limit plates 141 is fixedly connected to the top end of the piston rod 17, and a connecting block 171 is fixedly connected to the top end of the piston rod 17, and the connecting block 171 is fixedly connected to the middle part of the push rod 22. A connecting ring 18 is fixedly connected to the outer surface of the opposite end of the second movable cylinder 19 and the first movable cylinder 16, and a support ring 181 is clamped on the outer surface of one end of the connecting ring 18, and a sealing ring 182 is clamped on the outer surface of the other end of the connecting ring 18. A spring 15 is disposed between the second movable cylinder 19 and the first movable cylinder 16 , and the spring 15 is sleeved on the outer surface of the movable rod 14 .

[0045] In this embodiment, the first oil inlet 11, the second oil inlet 12 and the third oil inlet 13 are independently controlled to achieve precise adjustment of the lifting process of the piston rod 17. According to the inflow of oil from different oil inlets, the lifting length and speed of the piston rod 17 can be flexibly adjusted to meet different operating requirements, thereby improving the flexibility and control accuracy of the system.

[0046] During the lifting and lowering process of the first movable cylinder 16 and the second movable cylinder 19, the design of the sealing ring 182 and the support ring 181 further ensures the stability of the operation. The sealing ring 182 effectively prevents oil leakage and ensures the stability of the pressure inside the cylinder, so that the system can reliably perform lifting and lowering operations. At the same time, the support ring 181 provides additional structural support, so that the connecting ring 18 always remains vertical to the cylinder body 1 during the lifting and lowering process, thereby preventing the first movable cylinder 16 and the second movable cylinder 19 from tilting or being unstable, and ensuring the smooth operation of the entire system.

[0047] In addition, the spring 15 disposed between the first movable cylinder 16 and the second movable cylinder 19 can play a buffering role. When the two movable cylinders approach each other during the lifting process, the spring 15 can effectively buffer the collision between them, avoiding direct contact and damage to parts, thereby extending the service life of the equipment and improving overall safety. This design not only reduces the wear on parts, but also ensures the smoothness of the lifting operation, which helps to improve the reliability and operating experience of the equipment.

[0048] The use method and working principle of the device: When the piston rod 17 is raised or lowered, the connecting block 171 is driven to be raised or lowered together, and the connecting block 171 also pushes the top rod 22 to move accordingly. When the top rod 22 moves, it drives the lifting frame 27 to move together. In this process, the driving wheel 23 and the driven wheel 25 can rotate simultaneously through the transmission of the belt 24. During the lifting process, the lifting cylinder 5 moves together with the first clamp 28, and the first clamp 28 can slide along the outer surface of the belt 24.

[0049] Since the lifting frame 27 is restricted by the two fixed plates 21 when it moves, it will move up and down in the vertical direction, and at the same time drive the driven wheel 25 to move up and down together. When hydraulic oil is injected into the cylinder body 1, the piston rod 17 and the lifting cylinder 5 start to move. If the lifting speeds of the piston rod 17 and the lifting cylinder 5 are inconsistent, the lifting cylinder 5 will slide along the outer surface of the cylinder body 1, so that the belt 24 not only slides along the surface of the first clamp 28, but also maintains a stable position under the restriction of the second clamp 29 without deviation. The auxiliary function of the lifting cylinder 5 also ensures that the push rod 22 does not deviate during lifting; at the same time, when the lifting frame 27 moves driven by the push rod 22 and the connecting block 171, it also maintains vertical movement under the constraint of the fixed rod 26 without tilting. In this process, the first limit hole 272 will slide relative to the fixed rod 26, thereby ensuring that the lifting cylinder 5 and the piston rod 17 remain stable during multiple lifting processes, avoiding wear of the internal components of the cylinder body 1.

[0050] When the piston rod 17 is recovered, its bottom end will be spirally connected with the spiral sleeve 63, thereby applying a spiral force to rotate the spiral sleeve 63, thereby driving the rotating frame 62 to rotate. The rotation of the rotating frame 62 will push the rotating arm 622 to rotate, and the rotation of the rotating arm 622 applies a force to the driving rod 67 through the driving hole 621, so that the driving rod 67 moves stably under the restriction of the baffle 671, and bears the force of the rotating arm 622 and the driving hole 621, thereby driving the calibration frame 66 to move. When the calibration frame 66 moves, the moving rod 65 at its bottom will slide in the second limiting hole 641, thereby realizing the linear motion of the calibration frame 66. In addition, since a plurality of rotating arms 622 are provided on the outer surface of the rotating frame 62, a plurality of calibration frames 66 can move simultaneously. The calibration frame 66 gradually approaches the piston rod 17, thereby restricting it. When the piston rod 17 contacts the ball 661, if there is no tilt, it moves relative to the ball 661 without causing any unnecessary interference; if there is a tilt, the piston rod 17 is ensured to maintain a straight rise and fall under the action of the multiple balls 661. In addition, if the piston rod 17 does not reach the maximum stroke during the rise and fall, the spiral groove at the bottom will not act on the spiral sleeve 63.

[0051] During the lifting operation, the oil inlet can be adjusted by rotating the first oil inlet 11, the second oil inlet 12 and the third oil inlet 13, so as to adjust the lifting length and state of the piston rod 17 according to different oil inlet amounts and oil inlet positions, thereby improving the flexibility of use. During the lifting and lowering process of the second movable cylinder 19 and the first movable cylinder 16, the sealing ring 182 plays a sealing role, and the support ring 181 plays a supporting role, ensuring that the connecting ring 18 remains vertical to the cylinder body 1 during the lifting and lowering process, preventing the second movable cylinder 19 and the first movable cylinder 16 from tilting. In addition, the spring 15 between the first movable cylinder 16 and the second movable cylinder 19 can play a buffering role to prevent them from being damaged by direct collision.

[0052] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An adjustable hydraulic cylinder for a dump truck, comprising a cylinder body (1), a second earring (4) fixedly connected to the bottom of the cylinder body (1), and a lifting cylinder (5) slidably sleeved on the outer surface of the cylinder body (1), characterized in that: Limiting mechanisms (2) are installed on both sides of the lifting cylinder (5), first notches (51) are opened on both sides of the lifting cylinder (5), and second notches (52) are opened on the other two sides of the lifting cylinder (5), and a calibration mechanism (6) is installed on the top of the cylinder body (1); The limiting mechanism (2) comprises a top rod (22) and a lifting frame (27), wherein the top rod (22) is located in the inner cavity of the lifting cylinder (5), and the outer surfaces of both ends of the top rod (22) are fixedly connected to the top of the lifting frame (27), a first limiting hole (272) is opened in the middle of the lifting frame (27), a fixing rod (26) is slidably connected to the top of the inner cavity of the first limiting hole (272), one end of the fixing rod (26) is fixedly connected to a second clamp (29), a first clamp (28) is arranged on one side of the bottom end of the lifting cylinder (5), a bottom rod (271) is fixedly connected to one side of the bottom end of the lifting frame (27), one end of the outer surface of the bottom rod (271) is rotatably connected to a driven wheel (25), and the outer surfaces of both ends of the top rod (22) are rotatably connected to a driving wheel (23), a belt (24) is sleeved on the surface of the driving wheel (23), and the bottom end of the belt (24) is sleeved on the outer surface of the driven wheel (25).

2. The adjustable hydraulic cylinder for a dump truck according to claim 1, characterized in that: The belt (24) passes through the first clamp (28) and the second clamp (29) respectively; the top of the lifting cylinder (5) is fixedly connected to the first earring (3); both sides of the lifting cylinder (5) are fixedly connected to fixing plates (21); the two fixing plates (21) are respectively located on both sides of the first notch (51); the lifting frame (27) is located between the two fixing plates (21); and the first clamp (28) is fixedly connected to the fixing plates (21).

3. The adjustable hydraulic cylinder for a dump truck according to claim 1, characterized in that: The calibration mechanism (6) comprises a shell (61), a fixed frame (64) is fixedly connected to the inner side of the shell (61), a rotating frame (62) is arranged above the fixed frame (64), a second limiting hole (641) is opened on the outer side of the fixed frame (64), and a moving rod (65) is slidably connected to the inner side of the second limiting hole (641).

4. The adjustable hydraulic cylinder for a dump truck according to claim 3, characterized in that: A plurality of calibration frames (66) are arranged above the fixed frame (64); the bottom of one end of the calibration frame (66) is fixedly connected to the top of the moving rod (65); and the top of one end of the calibration frame (66) is fixedly connected to a driving rod (67).

5. The adjustable hydraulic cylinder for a dump truck according to claim 4, characterized in that: A spiral sleeve (63) is fixedly connected to the middle of the rotating frame (62), and the spiral sleeve (63) is rotatably connected to the outer shell (61). A plurality of rotating arms (622) are arranged on the outer side of the spiral sleeve (63), and a driving hole (621) is opened on the surface of the rotating arm (622), and the driving hole (621) is slidably connected to the driving rod (67).

6. The adjustable hydraulic cylinder for a dump truck according to claim 5, characterized in that: A baffle (671) is fixedly connected to the top of the driving rod (67), and the diameter of the baffle (671) is greater than the width of the driving hole (621). A plurality of mounting grooves (662) are provided on the inner side of the calibration frame (66), and a ball (661) is movably connected to the inner side of the mounting groove (662).

7. The adjustable hydraulic cylinder for a dump truck according to claim 1, characterized in that: A second oil inlet (12) is provided at the center of the side wall of the cylinder body (1), a first oil inlet (11) is provided at the top end of the side wall of the cylinder body (1), a third oil inlet (13) is provided at the bottom end of the side wall of the cylinder body (1), and a movable rod (14) is provided in the inner cavity of the cylinder body (1).

8. The adjustable hydraulic cylinder for a dump truck according to claim 7, characterized in that: A second movable cylinder (19) is arranged on the outer surface of the top end of the movable rod (14), and a first movable cylinder (16) is arranged on the outer surface of the bottom end of the movable rod (14). Both ends of the movable rod (14) are fixedly connected to limit plates (141), and a piston rod (17) is fixedly connected to the top end of one of the limit plates (141). A connecting block (171) is fixedly connected to the top end of the piston rod (17), and the connecting block (171) is fixedly connected to the middle part of the push rod (22).

9. The adjustable hydraulic cylinder for a dump truck according to claim 8, characterized in that: The outer surfaces of the opposite ends of the second movable cylinder (19) and the first movable cylinder (16) are both fixedly connected with a connecting ring (18), the outer surface of one end of the connecting ring (18) is clamped with a supporting ring (181), and the outer surface of the other end of the connecting ring (18) is clamped with a sealing ring (182).

10. The adjustable hydraulic cylinder for a dump truck according to claim 9, characterized in that: A spring (15) is arranged between the second movable cylinder (19) and the first movable cylinder (16), and the spring (15) is sleeved on the outer surface of the movable rod (14).

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