Multi-section hydraulic oil cylinder structure assembly for counterbalance forklift truck

Abstract

The invention discloses a multi-section type hydraulic oil cylinder structure assembly for a counterbalance forklift truck, and relates to the technical field of multi-stage hydraulic oil cylinders, the multi-section type hydraulic oil cylinder structure assembly comprises a fixed cylinder body, a movable cylinder body is arranged in the fixed cylinder body, and a rod body is arranged in the movable cylinder body; the end parts of the fixed cylinder body and the movable cylinder body are respectively provided with a sealing end head assembly for ensuring the internal sealing performance; the sealing end head assembly comprises a cylinder cover, a first sealing ring installed in a first sealing groove, a second sealing ring installed in a second sealing groove and threads arranged on the outer wall of the circumference of the cylinder cover. A cavity communicated with the fixed cylinder body is formed in the bottom end of the fixed cylinder body. In the hydraulic oil injection process, the sealing assembly can be unfolded, so that the contact area of the second piston body and the hydraulic oil is enlarged, the sealing performance is further improved, and efficient and stable operation of the oil cylinder is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of multi-stage hydraulic cylinders, and in particular to a multi-section hydraulic cylinder structural component for a counterbalanced forklift. Background Art

[0002] In the modern logistics and warehousing industry, counterbalanced forklifts, as a key material handling equipment, are widely used in various warehouses, factories and other places. The efficiency and stability of their operation are crucial to the entire logistics operation process, and the hydraulic cylinder, as one of the core components of the counterbalanced forklift, directly affects the performance of the forklift's key actions such as lifting and lowering.

[0003] At present, due to the frequent material loading and unloading operations of forklifts, the impact of hydraulic oil is relatively severe. Traditional hydraulic cylinders lack effective buffering measures, causing key components such as pistons to bear large impact forces for a long time, accelerating the wear of components, and further affecting the accuracy and stability of the cylinder, reducing the working efficiency of the forklift, and increasing maintenance costs and downtime.

[0004] In addition, in the multi-section hydraulic cylinder, the cylinder body and the rod body are prone to jamming, shaking and other unstable phenomena during the lifting process, which affects the accuracy and safety of the forklift in handling goods. Therefore, a multi-section hydraulic cylinder structural assembly for a counterbalanced forklift is urgently needed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and propose a multi-section hydraulic cylinder structural assembly for a counterbalanced forklift. Its advantages are: during the process of injecting hydraulic oil, the sealing assembly can be expanded, thereby expanding the contact area between the second piston body and the hydraulic oil, further improving the sealing performance, and ensuring the efficient and stable operation of the cylinder.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A multi-section hydraulic cylinder structure assembly for a counterbalanced forklift, comprising a fixed cylinder body, a movable cylinder body is arranged inside the fixed cylinder body, and a rod body is arranged inside the movable cylinder body; The ends of the fixed cylinder body and the movable cylinder body are both provided with sealing end head assemblies to ensure internal sealing; The sealing end head assembly includes a cylinder head, a first sealing ring installed in a first sealing groove, a second sealing ring installed in a second sealing groove, and screw threads arranged on the outer circumferential wall of the cylinder head; The bottom end of the fixed cylinder body is provided with a cavity connected thereto, the circumferential outer wall of the cavity is fixedly connected to an oil inlet pipe, and the bottom of the cavity is fixedly connected to a base; The fixed cylinder body and the movable cylinder body are provided with piston assemblies inside to ensure the stable lifting of the movable cylinder body and the rod body; The piston assembly comprises a second piston body and a first piston body respectively arranged inside the fixed cylinder body and the movable cylinder body; The ends of the movable cylinder body are respectively provided with a buffer component and a sealing component to reduce the impact force of the hydraulic oil; The contact area between the second piston body and the hydraulic oil is enlarged by the circular motion of the buffer assembly to expand the circumference of the sealing assembly.

[0007] Through the above technical scheme: the circular motion of the buffer assembly is used to expand the circumference of the sealing assembly to expand the contact area between the second piston body and the hydraulic oil. By nesting the fixed cylinder body and the movable cylinder body and arranging a rod body inside, this structure lays a foundation for realizing the lifting function of the forklift. At the same time, the sealing end head assembly at the end of the fixed cylinder body and the movable cylinder body, and its cylinder cover cooperates with the first sealing ring, the second sealing ring and the screw thread, which ensures the sealing inside the oil cylinder as a whole, effectively prevents hydraulic oil leakage, and provides a guarantee for the stable operation of the oil cylinder.

[0008] The present invention is further configured such that the buffer assembly includes an arc plate fixedly connected to the bottom end of the second piston body, the arc plates are fixedly connected to each other by multiple groups of arc rods, the arc plates are distributed in an equidistant circle at the bottom of the second piston body, one end of the arc plate away from the second piston body is fixedly connected to a fixed tube, the circumferential outer wall of the fixed tube is sleeved with a rotating sleeve, and the circumferential outer wall of the rotating sleeve is fixedly connected to a spiral blade.

[0009] Through the above technical solution: the spiral blade converts the impact force of the hydraulic oil into the power of circular motion, effectively reducing the direct impact on the second piston body, protecting the piston and related components, and extending the service life of the cylinder.

[0010] The present invention is further configured such that an outer wall on one side of the arc-shaped plate is provided with equally spaced diversion grooves, and the cross-section of the diversion grooves is wavy.

[0011] Through the above technical solution: when the hydraulic oil impacts, the impact force of the hydraulic oil is further dispersed. This special shape of the diverter groove can make the hydraulic oil act on the second piston body more evenly, reduce local pressure concentration, reduce the risk of component damage, and enhance the buffering effect of the buffer assembly, ensuring the smooth operation of the hydraulic system during forklift operation.

[0012] The present invention is further configured such that the second piston body is arranged at the end of the movable cylinder body, the first piston body is arranged at the end of the rod body, and the circumferential outer walls of the first piston body and the second piston body are both provided with a third sealing ring.

[0013] Through the above technical solution: under the pressure of hydraulic oil, it can ensure the stable lifting of the movable cylinder body and the rod body, realize the material handling and other operations of the forklift, and at the same time ensure the stability of the hydraulic oil inside the cylinder to avoid leakage affecting work efficiency and equipment performance.

[0014] The present invention is further configured such that the bottom end of the rotating sleeve is fixedly connected to a fixed seat, the top of the fixed seat is fixedly connected to a first rotating column, the circumferential inner wall of the fixed tube is respectively fixedly connected to a first rotating frame and a second rotating frame, and the first rotating column is rotatably connected to the first rotating frame and the second rotating frame.

[0015] Through the above technical solution: stable power transmission can be provided for the subsequent driving of the sealing component, ensuring the stability of the transmission between the buffer component and the sealing component.

[0016] The present invention is further configured as follows: the sealing assembly includes a gear ring frame fixedly connected to the circumferential outer wall of the first rotating column, the circumferential outer wall of the gear ring frame is meshed with a gear column, the circumferential inner wall of the gear column is fixedly connected with a rotating shaft, the rotating shaft is rotatably connected to the fixed tube, the number of the gear columns is four, the circumferential outer walls of the four gear columns are respectively meshed with racks, the four racks are equidistantly distributed up and down inside the fixed tube, a connecting plate is fixedly connected to the outer wall of one side of the rack, a baffle is fixedly connected to the top of the connecting plate, and the top of the baffle is in contact with the bottom end of the second piston body.

[0017] Through the above technical solution: when the rotating sleeve drives the first rotating column to rotate, the gear ring frame drives the gear column to rotate, thereby causing the rack to move up and down, driving the baffle to expand in a circular shape, thereby expanding the contact area between the second piston body and the hydraulic oil, significantly improving the sealing performance, and ensuring the efficient and stable operation of the cylinder under high-pressure working conditions.

[0018] The present invention is further configured such that a limiting groove and an arc groove are respectively provided on the circumferential outer wall of the fixed tube, the limiting groove is connected to the arc groove, the baffle and the rack pass through the inside of the arc groove and the limiting groove respectively, and through holes distributed at equal distances are provided on the outer wall of one side of the connecting plate.

[0019] Through the above technical solution: it is possible to provide precise limiting and guiding for the movement of the baffle and the rack, ensure the stability and accuracy of the sealing assembly during the expansion and contraction process, avoid jamming or misalignment, and further improve the working reliability of the sealing assembly.

[0020] The present invention is further configured such that a gear rod is fixedly connected to the bottom of the sealing end head assembly located at the end of the fixed cylinder body, an active cavity is respectively opened at one end of the second piston body, third rotating columns are rotatably connected to the inner walls on both sides of the active cavity, a third gear plate is fixedly connected to the circumferential outer wall of the third rotating column, the third gear plate is meshed with the gear rod, a through groove is opened inside the second piston body for the gear rod to pass through, and the through groove is communicated with the active cavity.

[0021] Through the above technical solution: the transmission from the movement of the gear rod to the rotation of the first rotating column is realized. This transmission process indirectly controls the action of the sealing component, so that the sealing component can be adjusted in time according to the working state of the cylinder to ensure the reliability of the sealing effect.

[0022] The present invention is further configured such that the circumferential outer wall of the third rotating column is fixedly connected to the second bevel gear, the circumferential outer wall of the second bevel gear is meshed with the first bevel gear, the circumferential inner wall of the first bevel gear is fixedly connected to the second rotating column, the circumferential outer wall of the second rotating column is fixedly connected to the first gear plate, the circumferential outer wall of the first gear plate is meshed with a gear ring plate, the circumferential inner wall of the gear ring plate is fixedly connected to the fourth rotating column, one end of the fourth rotating column is fixedly connected to a driven wheel, the circumferential outer wall of the driven wheel is transmission-connected to a transmission belt, the driven wheel is transmission-connected to a driving wheel through the transmission belt, the driving wheel is fixedly connected to the circumferential outer wall of the first rotating column, and a one-way flow component for preventing leakage of hydraulic oil is provided inside the movable cavity.

[0023] Through the above technical solution: when the hydraulic cylinder extends, the baffle in the sealing assembly is expanded, thereby expanding the contact area between the second piston body and the hydraulic oil, thereby improving the extension efficiency of the entire hydraulic cylinder; when the hydraulic cylinder retracts, the baffle in the sealing assembly will be recovered, thereby accelerating the discharge of the hydraulic oil inside the cylinder body and improving the retraction efficiency of the hydraulic cylinder.

[0024] The present invention is further configured such that the one-way circulation component includes a rotating groove opened inside the active cavity, the inner walls on both sides of the rotating groove are rotatably connected to a sealing plate, an outer wall on one side of the sealing plate is fixedly connected to an equidistantly distributed spring, one end of the spring away from the sealing plate is fixedly connected to an inner wall on one side of the active cavity, and a sealing gasket is bonded to an inner wall on one side of the through groove.

[0025] Through the above technical solution: when the hydraulic oil tries to flow in the opposite direction, the spring pushes the sealing plate to fit tightly against the inner wall of the groove, and the sealing gasket further enhances the sealing effect, effectively preventing the hydraulic oil from flowing back, maintaining the internal pressure of the cylinder stable, ensuring the normal operation of the hydraulic system, and avoiding damage to the equipment caused by the backflow of hydraulic oil.

[0026] The beneficial effects of the present invention are: A multi-section hydraulic cylinder structural component for a counterbalanced forklift, a sealing end head component at the ends of a fixed cylinder body and a movable cylinder body, composed of a cylinder head, a first sealing ring, a second sealing ring and a screw thread, which ensures internal sealing from the overall structure of the cylinder and effectively prevents hydraulic oil leakage. When working, the hydraulic oil enters the cylinder to drive the piston to move, and the sealing end head component can maintain the stability of the internal pressure of the cylinder. At the same time, the sealing component at the end of the movable cylinder body plays a unique role under the action of the buffer component. When the hydraulic oil impacts the second piston body, the arc plate of the buffer component drives the fixed pipe and the rotating sleeve to rotate, and the spiral blades on the rotating sleeve convert the impact force into circular motion power. The rotation of the rotating sleeve drives the first rotating column on the fixed seat to rotate, and then the gear ring frame rotates, and the four gear columns meshing with the gear ring frame rotate synchronously, driving the rack to move up and down, so that the baffle is expanded in a circle, and the contact area between the second piston body and the hydraulic oil is expanded, further improving the sealing performance, and ensuring the efficient and stable operation of the cylinder.

[0027] A multi-section hydraulic cylinder structural component for a counterbalanced forklift. Through the buffer component, when the hydraulic oil rushes to the second piston body, the arc plate directly bears the impact. Since the arc plates are fixed to each other by arc rods and are distributed in an equidistant circle, the impact force can be evenly dispersed. The arc plate drives the fixed pipe and the rotating sleeve to rotate, and the spiral blade rotates in the hydraulic oil, converting the impact force of the hydraulic oil into the power of circular motion, slowing down the direct impact on the second piston body. In addition, the wave-shaped diversion groove on one side of the arc plate further disperses the impact force of the hydraulic oil, so that the hydraulic oil acts on the second piston body more evenly, reducing the risk of component damage, extending the service life of the cylinder, and ensuring the smooth operation of the hydraulic system during the operation of the forklift.

[0028] A multi-section hydraulic cylinder structural component for a counterbalanced forklift. When the cylinder is working, when the movable cylinder body and the rod body move, the gear rod at the bottom of the sealing end head component at the end of the fixed cylinder body meshes with the third gear plate in the active cavity of the second piston body. Through a series of transmission structures (third rotating column, second bevel gear, first bevel gear, second rotating column, first gear plate, gear ring plate, fourth rotating column, driven wheel, transmission belt, driving wheel), the transmission from the movement of the gear rod to the rotation of the first rotating column is realized, and the operation of the sealing component is indirectly controlled. At the same time, the one-way flow component in the active cavity plays a key role. When the hydraulic oil tries to flow in the reverse direction, the sealing plate in the rotating groove fits tightly against the inner wall of the through groove under the action of the spring, and the sealing gasket on one side of the through groove can cooperate with the gear rod to bite each other, thereby further enhancing the sealing effect, ensuring that the hydraulic oil can only flow in one direction, maintaining the internal pressure of the cylinder stable, and ensuring the normal operation of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall front structure of a multi-section hydraulic cylinder structural assembly for a counterbalanced forklift proposed by the present invention; Figure 2This is a schematic diagram of the overall partial cross-sectional structure of a multi-section hydraulic cylinder structural assembly for a counterbalanced forklift proposed by the present invention; Figure 3 A multi-section hydraulic cylinder structural assembly for a counterbalanced forklift proposed by the present invention Figure 2 A schematic diagram of the enlarged structure at A in the middle; Figure 4 A multi-section hydraulic cylinder structural assembly for a counterbalanced forklift proposed by the present invention Figure 2 A schematic diagram of the enlarged structure at B in the middle; Figure 5 A multi-section hydraulic cylinder structural assembly for a counterbalanced forklift proposed by the present invention Figure 2 Schematic diagram of the enlarged structure at C in the middle; Figure 6 This is a schematic diagram of the overall cross-sectional plan structure of a multi-section hydraulic cylinder structural assembly for a counterbalanced forklift proposed by the present invention; Figure 7 A multi-section hydraulic cylinder structural assembly for a counterbalanced forklift proposed by the present invention Figure 6 A schematic diagram of the enlarged structure at B in the middle; Figure 8 This is a schematic diagram of the overall front structure of a sealing assembly of a multi-section hydraulic cylinder structural assembly for a counterbalanced forklift proposed by the present invention; Fig. 9 A multi-section hydraulic cylinder structural assembly for a counterbalanced forklift proposed by the present invention Figure 8 Schematic diagram of the enlarged structure at E in the middle; Fig.10 This is a schematic diagram of the overall bottom view of the sealing assembly of a multi-section hydraulic cylinder structural assembly for a counterbalanced forklift proposed by the present invention; Fig.11 This is a schematic diagram of the disassembled internal structure of a sealing component of a multi-section hydraulic cylinder structural component for a counterbalanced forklift proposed by the present invention.

[0030] In the figure: 1, fixed cylinder body; 2, movable cylinder body; 3, rod body; 4, cavity; 5, base; 6, oil inlet pipe; 7, sealing end head assembly; 7001, cylinder head; 7002, first sealing ring; 7003, first sealing groove; 7004, screw thread; 7005, second sealing groove; 7006, second sealing ring; 9, driving wheel; 10, first rotating column; 11, transmission belt; 12, fixed pipe; 13, first rotating frame; 14, baffle; 15, rotating shaft; 16, gear column; 17, rack; 18, connecting plate; 19, through hole; 20, gear ring frame; 21, driven wheel; 22, gear ring plate ; 23. Second rotating column; 24. First gear plate; 25. First bevel gear; 26. Third gear plate; 27. Third rotating column; 28. Through groove; 29. ​​Sealing pad; 30. Sealing plate; 31. Rotating groove; 32. Spring; 33. Gear rod; 34. First piston body; 35. Second piston body; 36. Third sealing ring; 37. Movable cavity; 38. Arc plate; 39. Diverter groove; 40. Rotating sleeve; 41. Spiral blade; 42. Fixed seat; 43. Second rotating frame; 44. Arc rod; 45. Second bevel gear; 46. Limiting groove; 47. Arc groove; 48. Fourth rotating column. DETAILED DESCRIPTION

[0031] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0034] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0035] Reference Figure 1-Figure 11 A multi-section hydraulic cylinder structural assembly for a counterbalanced forklift, comprising a fixed cylinder body 1, characterized in that a movable cylinder body 2 is arranged inside the fixed cylinder body 1, and a rod body 3 is arranged inside the movable cylinder body 2; The ends of the fixed cylinder body 1 and the movable cylinder body 2 are both provided with sealing end head assemblies 7 to ensure internal sealing; The sealing end head assembly 7 includes a cylinder cover 7001, a first sealing ring 7002 installed in a first sealing groove 7003, a second sealing ring 7006 installed in a second sealing groove 7005, and a screw thread 7004 arranged on the outer circumferential wall of the cylinder cover 7001; The bottom end of the fixed cylinder body 1 is provided with a cavity 4 connected thereto, an oil inlet pipe 6 is fixedly connected to the circumferential outer wall of the cavity 4, and a base 5 is fixedly connected to the bottom of the cavity 4; The fixed cylinder body 1 and the movable cylinder body 2 are provided with piston assemblies to ensure the stable lifting of the movable cylinder body 2 and the rod body 3; The piston assembly includes a second piston body 35 and a first piston body 34 which are respectively arranged inside the fixed cylinder body 1 and the movable cylinder body 2; The ends of the movable cylinder body 2 are respectively provided with a buffer component and a sealing component for alleviating the impact force of the hydraulic oil; The contact area between the second piston body 35 and the hydraulic oil is enlarged by expanding the circumference of the sealing assembly through the circular motion of the buffer assembly. The fixed cylinder body 1 and the movable cylinder body 2 are nested, and the rod body 3 is arranged inside. This structure lays a foundation for realizing the lifting function of the forklift. At the same time, the sealing end head assembly 7 at the end of the fixed cylinder body 1 and the movable cylinder body 2, its cylinder cover 7001 cooperates with the first sealing ring 7002, the second sealing ring 7006 and the screw thread 7004, which ensures the sealing inside the oil cylinder as a whole, effectively prevents the leakage of hydraulic oil, and provides a guarantee for the stable operation of the oil cylinder.

[0036] Specifically, the buffer assembly includes an arc plate 38 fixedly connected to the bottom end of the second piston body 35, and the arc plates 38 are fixedly connected to each other through multiple sets of arc rods 44. The arc plates 38 are distributed in an equidistant circle at the bottom of the second piston body 35. One end of the arc plate 38 away from the second piston body 35 is fixedly connected to a fixed tube 12, and a rotating sleeve 40 is sleeved on the circumferential outer wall of the fixed tube 12. The circumferential outer wall of the rotating sleeve 40 is fixedly connected to a spiral blade 41. The arc plate 38 fixed to the bottom end of the second piston body 35 in the buffer assembly is fixedly connected to the second piston body 35 by means of multiple sets of arc rods. 44 are interconnected and equidistantly distributed in a circle at the bottom of the second piston body 35. The fixed tube 12 connected to the arc plate 38 is sleeved with the rotating sleeve 40. The spiral blades 41 on the outer wall of the rotating sleeve 40 rotate in the hydraulic oil. When the hydraulic oil impacts the second piston body 35, the arc plate 38 evenly bears and disperses the impact force, driving the fixed tube 12 and the rotating sleeve 40 to rotate. The spiral blades 41 convert the impact force of the hydraulic oil into the power of circular motion, effectively reducing the direct impact on the second piston body 35, protecting the piston and related components, and extending the service life of the cylinder.

[0037] Specifically, the outer wall of one side of the arc plate 38 is provided with equally distributed diverter grooves 39, and the cross-section of the diverter grooves 39 is wavy. The equally distributed diverter grooves 39 and the wavy cross-section of the outer wall of one side of the arc plate 38 further disperse the impact force of the hydraulic oil when the hydraulic oil impacts. The diverter grooves 39 of this special shape can make the hydraulic oil act on the second piston body 35 more evenly, reduce local pressure concentration, reduce the risk of component damage, enhance the buffering effect of the buffer assembly, and ensure the smooth operation of the hydraulic system during the operation of the forklift.

[0038] Specifically, the second piston body 35 is arranged at the end of the movable cylinder body 2, the first piston body 34 is arranged at the end of the rod body 3, and the circumferential outer walls of the first piston body 34 and the second piston body 35 are both provided with a third sealing ring 36. The piston assembly arranged inside the fixed cylinder body 1 and the movable cylinder body 2 includes the second piston body 35 and the first piston body 34, which are respectively located in the fixed cylinder body 1 and the movable cylinder body 2, and cooperate with the third sealing ring 36 on the circumferential outer walls of the first piston body 34 and the second piston body 35. Under the pressure of the hydraulic oil, it can ensure the stable lifting and lowering of the movable cylinder body 2 and the rod body 3 to realize the material handling and other operating actions of the forklift, while ensuring the stability of the hydraulic oil inside the cylinder to avoid leakage affecting the working efficiency and equipment performance.

[0039] Specifically, the bottom end of the rotating sleeve 40 is fixedly connected to a fixed seat 42, the top of the fixed seat 42 is fixedly connected to a first rotating column 10, the circumferential inner wall of the fixed tube 12 is respectively fixedly connected to a first rotating frame 13 and a second rotating frame 43, the first rotating column 10 and the first rotating frame 13 and the second rotating frame 43 are all rotatably connected, the bottom end of the rotating sleeve 40 is fixedly connected to the fixed seat 42, the first rotating column 10 on the top of the fixed seat 42 is rotatably connected to the first rotating frame 13 and the second rotating frame 43 on the circumferential inner wall of the fixed tube 12, so that the rotating sleeve 40 can stably rotate around the fixed tube 12 when driven by the impact force of the hydraulic oil, thereby providing stable power transmission for the subsequent driving of the sealing assembly to ensure the stability of the transmission between the buffer assembly and the sealing assembly.

[0040] Specifically, the sealing assembly includes a gear ring frame 20 fixedly connected to the circumferential outer wall of the first rotating column 10, the circumferential outer wall of the gear ring frame 20 is meshed with a gear column 16, the circumferential inner wall of the gear column 16 is fixedly connected with a rotating shaft 15, the rotating shaft 15 is rotatably connected to the fixed tube 12, the number of the gear columns 16 is four, the circumferential outer walls of the four gear columns 16 are respectively meshed with racks 17, the four racks 17 are evenly distributed up and down inside the fixed tube 12, one side outer wall of the rack 17 is fixedly connected with a connecting plate 18, the top of the connecting plate 18 is fixedly connected with a baffle 14, the top of the baffle 14 is in contact with the bottom end of the second piston body 35, when the rotating sleeve 40 drives the first rotating column 10 to rotate, the gear ring frame 20 drives the gear column 16 to rotate, thereby causing the rack 17 to move up and down, driving the baffle 14 to expand circumferentially, expanding the contact area between the second piston body 35 and the hydraulic oil, significantly improving the sealing performance, and ensuring the efficient and stable operation of the cylinder under high-pressure working conditions.

[0041] Specifically, the circumferential outer wall of the fixed tube 12 is respectively provided with a limit groove 46 and an arc groove 47, the limit groove 46 is connected with the arc groove 47, the baffle 14 and the rack 17 pass through the inside of the arc groove 47 and the limit groove 46 respectively, and the outer wall of one side of the connecting plate 18 is provided with equidistantly distributed through holes 19, which can provide precise limiting and guiding for the movement of the baffle 14 and the rack 17, ensure the stability and accuracy of the sealing assembly during the expansion and contraction process, avoid jamming or misalignment, and further improve the working reliability of the sealing assembly.

[0042] Specifically, a gear rod 33 is fixedly connected to the bottom of the sealing end head assembly 7 at the end of the fixed cylinder body 1, and an active cavity 37 is respectively opened at one end of the second piston body 35. The inner walls on both sides of the active cavity 37 are rotatably connected to the third rotating column 27. The circumferential outer wall of the third rotating column 27 is fixedly connected to the third gear plate 26. The third gear plate 26 is meshed with the gear rod 33. A through groove 28 is opened inside the second piston body 35 for the gear rod 33 to pass through. The through groove 28 is connected to the active cavity 37. The gear rod 33 at the bottom of the sealing end head assembly 7 at the end of the fixed cylinder body 1 is connected to the The third gear plate 26 in the active cavity 37 of the second piston body 35 is meshed, and the transmission from the movement of the gear rod 33 to the rotation of the first rotating column 10 is realized through a series of transmission structures such as the third rotating column 27, the second bevel gear 45, the first bevel gear 25, the second rotating column 23, the first gear plate 24, the gear ring plate 22, the fourth rotating column 48, the driven wheel 21, the transmission belt 11 and the driving wheel 9. This transmission process indirectly controls the action of the sealing assembly, so that the sealing assembly can be adjusted in time according to the working state of the cylinder to ensure the reliability of the sealing effect.

[0043] Specifically, the circumferential outer wall of the third rotating column 27 is fixedly connected to the second bevel gear 45, the circumferential outer wall of the second bevel gear 45 is meshed with the first bevel gear 25, the circumferential inner wall of the first bevel gear 25 is fixedly connected to the second rotating column 23, the circumferential outer wall of the second rotating column 23 is fixedly connected to the first gear plate 24, the circumferential outer wall of the first gear plate 24 is meshed with the gear ring plate 22, the circumferential inner wall of the gear ring plate 22 is fixedly connected to the fourth rotating column 48, one end of the fourth rotating column 48 is fixedly connected to the driven wheel 21, and the driven wheel 21 is fixedly connected to the driven wheel 21. The outer circumferential wall of the wheel 21 is connected to the transmission belt 11, and the driven wheel 21 is connected to the driving wheel 9 through the transmission belt 11. The driving wheel 9 is fixedly connected to the outer circumferential wall of the first rotating column 10. The inside of the movable cavity 37 is provided with a one-way flow component for preventing hydraulic oil leakage. The third rotating column 27 serves as a starting transmission component, and its rotation will drive the second bevel gear 45 to rotate synchronously. The second bevel gear 45 is meshed with the first bevel gear 25, and the rotation is transmitted to the first bevel gear 25, thereby driving the second rotating column connected thereto. The column 23 rotates, and the second rotating column 23 drives the first gear plate 24 to rotate. The meshing of the first gear plate 24 and the gear ring plate 22 causes the gear ring plate 22 to rotate, and the gear ring plate 22 drives the fourth rotating column 48 to rotate, and the driven wheel 21 connected to one end of the fourth rotating column 48 rotates accordingly. The driven wheel 21 transmits power to the driving wheel 9 through the transmission belt 11. The driving wheel 9 is fixed on the first rotating column 10, thereby driving the first rotating column 10 to rotate. This series of transmission processes realizes the movement of the gear rod 33 at the bottom of the sealing end head assembly 7 at the end of the fixed cylinder body 1, indirectly controls the rotation of the first rotating column 10, and then accurately controls the action of the sealing assembly to ensure that the sealing assembly can respond in time under different working conditions. When the hydraulic cylinder is extended, the baffle 14 in the sealing assembly is expanded, thereby expanding the contact area between the second piston body 35 and the hydraulic oil, thereby improving the extension efficiency of the entire hydraulic cylinder. When the hydraulic cylinder retracts, the baffle 14 in the sealing assembly will be recovered, thereby accelerating the discharge of the hydraulic oil inside the movable cylinder body 2 and improving the retraction efficiency of the hydraulic cylinder.

[0044] Specifically, the one-way flow component includes a rotating groove 31 opened inside the active cavity 37, and the inner walls on both sides of the rotating groove 31 are rotatably connected to the sealing plates 30, and the outer wall on one side of the sealing plate 30 is fixedly connected to the equidistantly distributed springs 32, and the end of the spring 32 away from the sealing plate 30 is fixedly connected to the inner wall on one side of the active cavity 37, and a sealing gasket 29 is bonded to the inner wall on one side of the through groove 28. When the hydraulic oil tries to flow in the opposite direction, the spring 32 pushes the sealing plate 30 to fit tightly against the inner wall of the through groove 28, and the sealing gasket 29 further enhances the sealing effect, effectively preventing the hydraulic oil from flowing back, maintaining the internal pressure of the oil cylinder stable, ensuring the normal operation of the hydraulic system, and avoiding damage to the equipment due to the backflow of hydraulic oil.

[0045] Working principle: When the entire hydraulic cylinder is working, the staff will let the external hydraulic oil flow into the cavity 4 at the bottom of the fixed cylinder body 1 through the oil inlet pipe 6. Since the cavity 4 is connected with the fixed cylinder body 1, the hydraulic oil will generate pressure after entering. At this time, the second piston body 35 and the first piston body 34 located inside the fixed cylinder body 1 and the movable cylinder body 2 are pushed by the hydraulic oil. Because the second piston body 35 is set at the end of the movable cylinder body 2 and the first piston body 34 is set at the end of the rod body 3, under the action of pressure, the movable cylinder body 2 and the rod body 3 begin to rise and fall to complete the corresponding operation of the forklift. In addition, the third sealing ring 36 on the outer wall of the circumference of the first piston body 34 and the second piston body 35 can effectively prevent the hydraulic oil from leaking during the piston movement, ensuring the stability of the internal pressure of the cylinder. When the hydraulic oil rushes toward the second piston body 35, the buffer assembly begins to work, and the arc plate 38 fixedly connected to the bottom end of the second piston body 35 will be directly subjected to the impact force of the hydraulic oil. Since the arc plates 38 are fixed to each other by multiple sets of arc rods 44 and are equidistantly distributed in a circle at the bottom of the second piston body 35, they can evenly withstand the impact. The fixed tube 12 fixed to one end of the arc plate 38 away from the second piston body 35 will move with the arc plate 38, thereby driving the rotating sleeve 40 sleeved on its circumferential outer wall to rotate. The spiral blades 41 on the circumferential outer wall of the rotating sleeve 40 rotate in the hydraulic oil, converting the impact force of the hydraulic oil into the power of circular motion, effectively slowing down the direct impact on the second piston body 35. In addition, the equally distributed and wavy cross-sectioned diversion grooves 39 on the outer wall of one side of the arc plate 38 can further disperse the impact force of the hydraulic oil, allowing the hydraulic oil to act more evenly on the second piston body 35, thereby enhancing the buffering effect. When the rotating sleeve 40 rotates, the fixed seat 42 fixedly connected to its bottom end will also rotate accordingly, thereby driving the first rotating column 10 on the top of the fixed seat 42 to rotate. The gear ring frame 20 fixedly connected to the outer wall of the circumference of the first rotating column 10 rotates accordingly, and the four gear columns 16 meshing with the gear ring frame 20 will rotate synchronously. The gear column 16 is rotatably connected to the fixed tube 12 through the rotating shaft 15 on the inner wall of the circumference. When the gear column 16 rotates, it will drive the rack 17 meshing with it to move up and down inside the fixed tube 12, and the connecting plate 18 fixedly connected to the outer wall on one side of the rack 17, and the baffle 14 fixedly connected to the top of the connecting plate 18, will move with the movement of the rack 17. The baffle 14 and the rack 17 pass through the arc groove 47 and the limit groove 46 opened on the outer wall of the circumference of the fixed tube 12 respectively, so that the baffle 14 expands circumferentially, thereby expanding the contact area between the second piston body 35 and the hydraulic oil, improving the sealing performance, and improving the working efficiency of the oil cylinder; A gear rod 33 is fixedly connected to the bottom of the sealing end head assembly 7 at the end of the fixed cylinder body 1. When the oil cylinder is working and the movable cylinder body 2 and the rod body 3 move, the gear rod 33 will mesh with the third gear plate 26 in the movable chamber 37 opened at one end of the second piston body 35, and the gear rod 33 drives the third gear plate 26 to rotate. The third gear plate 26 is fixed to the circumferential outer wall of the third rotating column 27. When the third rotating column 27 rotates, the second bevel gear 45 fixed thereon rotates accordingly, and the second bevel gear 45 meshes with the first bevel gear 25, driving the first bevel gear 25 to rotate. The first bevel gear 25 is fixed on the circumferential inner wall of the second rotating column 23, thereby causing the second rotating column 23 to rotate, and the first gear plate 24 fixed on the circumferential outer wall of the second rotating column 23 rotates accordingly, and the gear ring plate 22 meshing with the first gear plate 24 also starts to rotate. The fourth rotating column 48 fixed on the circumferential inner wall of the gear ring plate 22 will drive the driven wheel 21 fixed at one end to rotate. The driven wheel 21 is connected to the driving wheel 9 through the transmission belt 11. The driving wheel 9 is fixed on the circumferential outer wall of the first rotating column 10. In this way, a series of transmissions from the movement of the gear rod 33 to the rotation of the first rotating column 10 are realized, which indirectly controls the action of the sealing component. At the same time, the one-way flow component arranged in the active chamber 37 can prevent the leakage of hydraulic oil. The inner walls on both sides of the rotating groove 31 opened in the active chamber 37 are rotatably connected to the sealing plate 30. The outer wall of one side of the sealing plate 30 is fixed with springs 32 distributed at equal distances. The other end of the spring 32 is fixed on the inner wall of one side of the active chamber 37. When the hydraulic oil tries to flow in the opposite direction, under the action of the spring 32, the sealing plate 30 is tightly fitted to the inner wall of the through groove 28. The sealing gasket 29 bonded to the inner wall of one side of the through groove 28 further enhances the sealing effect to ensure that the hydraulic oil can only flow in one direction.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-section hydraulic cylinder structure assembly for a counterbalanced forklift, comprising a fixed cylinder body (1), characterized in that: A movable cylinder body (2) is arranged inside the fixed cylinder body (1), and a rod body (3) is arranged inside the movable cylinder body (2); The ends of the fixed cylinder body (1) and the movable cylinder body (2) are both provided with sealing end head assemblies (7) for ensuring internal sealing; The sealing end head assembly (7) comprises a cylinder cover (7001), a first sealing ring (7002) installed in a first sealing groove (7003), a second sealing ring (7006) installed in a second sealing groove (7005), and a screw thread (7004) arranged on the circumferential outer wall of the cylinder cover (7001); The bottom end of the fixed cylinder body (1) is provided with a cavity (4) in communication therewith, an oil inlet pipe (6) is fixedly connected to the circumferential outer wall of the cavity (4), and a base (5) is fixedly connected to the bottom of the cavity (4); The fixed cylinder body (1) and the movable cylinder body (2) are provided with piston assemblies inside to ensure the stable lifting and lowering of the movable cylinder body (2) and the rod body (3); The piston assembly comprises a second piston body (35) and a first piston body (34) which are respectively arranged inside the fixed cylinder body (1) and the movable cylinder body (2); The ends of the movable cylinder body (2) are respectively provided with a buffer component for relieving the impact force of the hydraulic oil and a sealing component; The circumferential movement of the buffer assembly causes the sealing assembly to expand circumferentially, thereby increasing the contact area between the second piston body (35) and the hydraulic oil.

2. A multi-section hydraulic cylinder structural assembly for a counterbalanced forklift according to claim 1, characterized in that: The buffer assembly comprises an arc-shaped plate (38) fixedly connected to the bottom end of the second piston body (35); the arc-shaped plates (38) are fixedly connected to each other via a plurality of groups of arc-shaped rods (44); the arc-shaped plates (38) are distributed in a circular shape at equal distances at the bottom of the second piston body (35); one end of the arc-shaped plate (38) away from the second piston body (35) is fixedly connected to a fixed tube (12); a rotating sleeve (40) is sleeved on the circumferential outer wall of the fixed tube (12); and a spiral blade (41) is fixedly connected to the circumferential outer wall of the rotating sleeve (40).

3. A multi-section hydraulic cylinder structural assembly for a counterbalanced forklift according to claim 2, characterized in that: One side outer wall of the arc-shaped plate (38) is provided with equally spaced diversion grooves (39), and the cross section of the diversion grooves (39) is wavy.

4. The multi-section hydraulic cylinder structural assembly for a counterbalanced forklift according to claim 3, characterized in that: The second piston body (35) is arranged at the end of the movable cylinder body (2), the first piston body (34) is arranged at the end of the rod body (3), and the circumferential outer walls of the first piston body (34) and the second piston body (35) are both provided with a third sealing ring (36).

5. The multi-section hydraulic cylinder structural assembly for a counterbalanced forklift according to claim 4, characterized in that: The bottom end of the rotating sleeve (40) is fixedly connected to a fixed seat (42), the top of the fixed seat (42) is fixedly connected to a first rotating column (10), the circumferential inner wall of the fixed tube (12) is respectively fixedly connected to a first rotating frame (13) and a second rotating frame (43), and the first rotating column (10) is rotatably connected to the first rotating frame (13) and the second rotating frame (43).

6. The multi-section hydraulic cylinder structure assembly for a counterbalanced forklift according to claim 5, characterized in that: The sealing assembly comprises a gear ring frame (20) fixedly connected to the circumferential outer wall of the first rotating column (10), the circumferential outer wall of the gear ring frame (20) is meshed with a gear column (16), the circumferential inner wall of the gear column (16) is fixedly connected with a rotating shaft (15), the rotating shaft (15) is rotatably connected to the fixed tube (12), the number of the gear columns (16) is four, the circumferential outer walls of the four gear columns (16) are respectively meshed with racks (17), the four racks (17) are equidistantly distributed in the upper and lower parts of the fixed tube (12), the outer wall of one side of the rack (17) is fixedly connected with a connecting plate (18), the top of the connecting plate (18) is fixedly connected with a baffle (14), the top of the baffle (14) is in contact with the bottom end of the second piston body (35).

7. The multi-section hydraulic cylinder structural assembly for a counterbalanced forklift according to claim 6, characterized in that: The circumferential outer wall of the fixed tube (12) is provided with a limit groove (46) and an arc groove (47), the limit groove (46) is connected to the arc groove (47), the baffle (14) and the rack (17) pass through the arc groove (47) and the limit groove (46) respectively, and the outer wall of one side of the connecting plate (18) is provided with through holes (19) distributed at equal distances.

8. The multi-section hydraulic cylinder structure assembly for a counterbalanced forklift according to claim 7, characterized in that: A gear rod (33) is fixedly connected to the bottom of the sealing end head assembly (7) located at the end of the fixed cylinder body (1), and an active cavity (37) is respectively opened at one end of the second piston body (35), and third rotating columns (27) are rotatably connected to the inner walls on both sides of the active cavity (37), and a third gear plate (26) is fixedly connected to the circumferential outer wall of the third rotating column (27), and the third gear plate (26) is meshed with the gear rod (33), and a through groove (28) is opened inside the second piston body (35) for the gear rod (33) to pass through, and the through groove (28) is connected to the active cavity (37).

9. The multi-section hydraulic cylinder structural assembly for a counterbalanced forklift according to claim 8, characterized in that: The circumferential outer wall of the third rotating column (27) is fixedly connected to a second bevel gear (45), the circumferential outer wall of the second bevel gear (45) is meshed with the first bevel gear (25), the circumferential inner wall of the first bevel gear (25) is fixedly connected to the second rotating column (23), the circumferential outer wall of the second rotating column (23) is fixedly connected to a first gear plate (24), the circumferential outer wall of the first gear plate (24) is meshed with a gear ring plate (22), the circumferential inner wall of the gear ring plate (22) is fixedly connected to a fourth rotating column (48), one end of the fourth rotating column (48) is fixedly connected to a driven wheel (21), the circumferential outer wall of the driven wheel (21) is transmission-connected to a transmission belt (11), the driven wheel (21) is transmission-connected to a driving wheel (9) via the transmission belt (11), the driving wheel (9) is fixedly connected to the circumferential outer wall of the first rotating column (10), and a one-way flow component for preventing hydraulic oil leakage is provided inside the movable cavity (37).

10. The multi-section hydraulic cylinder structure assembly for a counterbalanced forklift according to claim 9, characterized in that: The one-way flow component comprises a rotating groove (31) provided inside the movable cavity (37), the inner walls on both sides of the rotating groove (31) are rotatably connected to sealing plates (30), an outer wall on one side of the sealing plate (30) is fixedly connected to an equidistantly distributed spring (32), one end of the spring (32) away from the sealing plate (30) is fixedly connected to an inner wall on one side of the movable cavity (37), and a sealing gasket (29) is bonded to an inner wall on one side of the through groove (28).

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