Electric oil cylinder lifting system

Abstract

The utility model discloses an electric oil cylinder lifting system which comprises an outer portal frame assembly, an inner portal frame assembly and a fork arm carrier assembly which are combined together, an electric lifting oil cylinder is arranged between the outer portal frame assembly and the inner portal frame assembly, an electric inclined oil cylinder connected with a frame is arranged on the outer portal frame assembly, and the fork arm carrier assembly is arranged on the inner portal frame assembly. And the shapes of the electric lifting oil cylinder and the electric tilting oil cylinder are consistent with those of the hydraulic driving lifting system. The electric oil cylinder is simple in structure, the appearance of the electric oil cylinder is designed to be basically consistent with that of a hydraulic oil cylinder of the diesel fork lift truck, interchange can be achieved, and therefore low-cost rapid upgrading is completed; secondly, hydraulic oil driving is replaced by electric driving, so that environmental pollution caused by hydraulic oil leakage can be avoided; on the other hand, the lifting system adopts the electric oil cylinder, so that the generated noise is low.

Description

Technical Field

[0001] The utility model relates to the technical field of forklifts, in particular to an electric oil cylinder lifting system. Background Art

[0002] The cylinder lifting system of an internal combustion forklift is one of its key components, mainly used to lift and lower cargo. This system usually includes the following components: Lifting cylinder: This is the main hydraulic component responsible for vertically lifting and lowering the inner mast and forks. When hydraulic oil is pumped into the cylinder, the piston rod extends and pushes the inner mast up; conversely, when the hydraulic oil is pumped out, the inner mast descends under the weight of the cargo. Tilt cylinder: Located on both sides of the forklift, it is used to tilt the mast forward and backward to facilitate the placement and retrieval of cargo. The tilt cylinder can adjust the angle of the mast to ensure the stability and safety of the cargo. Multi-way valve: Also known as a distribution valve, it controls the flow direction of the hydraulic oil and determines the working state of the cylinder (lifting, lowering or tilting). The multi-way valve can control multiple actuators at the same time, such as the lifting cylinder and the tilt cylinder. The efficiency and reliability of the traditional internal combustion forklift lifting system are crucial to the normal operation of the internal combustion forklift. The internal combustion forklift lifting system requires regular replacement of hydraulic oil, inspection of cylinder seals and cleaning of filters, which are common measures to ensure that the lifting system will not leak oil or make loud noises during use. On the other hand, when upgrading the internal combustion forklift lifting system to electric drive, more parts need to be replaced to ensure the smooth use of the lifting system, which often leads to high upgrade costs. For this reason, an electric cylinder lifting system is proposed. Utility Model Content

[0003] The purpose of the utility model is to provide an electric cylinder lifting system to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an electric cylinder lifting system, comprising an outer mast assembly, an inner mast assembly and a fork frame assembly combined together, an electric lifting cylinder is arranged between the outer mast assembly and the inner mast assembly, and an electric tilt cylinder connected to the frame is arranged on the outer mast assembly, and the appearance of the electric lifting cylinder and the electric tilt cylinder are configured to be consistent with that of the hydraulically driven lifting system.

[0005] As a further solution of the utility model: a pulley assembly is installed on the surface of the inner mast assembly, an electric distance adjusting cylinder circuit is provided on the surface of the fork frame assembly, and the electric distance adjusting cylinder circuit is connected to the hose pulley circuit through a transition joint, a steel pipe assembly is installed at the end of the hose pulley circuit, and the end of the steel pipe assembly is connected to the electric wire connected to the operating console.

[0006] As a further solution of the utility model: a sprocket is installed on the inner gantry assembly, a chain with one end connected to the outer gantry assembly is arranged on the outer peripheral surface of the sprocket, and the other end of the chain is connected to the fork carriage assembly.

[0007] As a further solution of the utility model: the number of the electric tilt cylinders is two, the ends of the two electric tilt cylinders are both connected to the outer gantry assembly through tilt cylinder pin shafts, two brackets are installed on the outer gantry assembly, clamping plates connected to the steel pipe assembly are installed on both of the two brackets, and the other ends of the two electric tilt cylinders are both connected to the frame through tilt cylinder clamping plates, and an operating platform for controlling the forklift to realize the actions of the lifting system is installed in the cab of the frame.

[0008] As a further solution of the utility model: the two electric tilt cylinders are connected through an electric tilt cylinder line, the electric hoisting cylinder includes a left electric hoisting cylinder and a right electric hoisting cylinder, and the left electric hoisting cylinder and the right electric hoisting cylinder are connected through an electric hoisting cylinder line.

[0009] As a further solution of the utility model: the fork carriage assembly includes a fork carriage and two electric distance adjusting cylinders arranged on the fork carriage, the ends of the two electric distance adjusting cylinders are both connected to the distance adjusting cylinder clamp through plug-in distance adjusting cylinder pin shafts, the distance adjusting cylinder clamp is connected to the fork carriage, and the other ends of the two electric distance adjusting cylinders are respectively connected to the left fork and the right fork.

[0010] As a further solution of the utility model: the left electric hoisting cylinder includes a hoisting cylinder base installed on the outer gantry assembly and a motor arranged in the hoisting cylinder base, an electric hoisting cylinder connector connected to the motor is arranged on the outer peripheral surface of the hoisting cylinder base, the end of the hoisting cylinder base is connected to the hoisting cylinder barrel, a piston rod welding part assembly is arranged inside the hoisting cylinder barrel, a hoisting cylinder lead screw is installed on the end face of the motor, and a locknut is installed on the end of the piston rod welding part assembly.

[0011] As a further solution of the utility model: the piston rod welding part assembly is composed of a piston rod and a piston rod base, wherein the piston rod is hollow, the outer thread is processed at the top for installing the hoisting cylinder locknut, and the threaded hole is processed in the inner hole of the piston rod base to ensure the coaxiality of the two during welding.

[0012] As a further solution of the utility model: a lamp bracket is installed on the outer gantry assembly.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] In this application, by designing the outer shape of the electric oil cylinder to be basically the same as that of the hydraulic oil cylinder of an internal combustion forklift, interchangeability can be achieved, thus completing a low-cost and rapid upgrade. Secondly, using electric drive instead of hydraulic oil drive can avoid environmental pollution caused by hydraulic oil leakage. On the other hand, the lifting system adopts an electric oil cylinder, generating relatively low noise. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the first perspective of the electric oil cylinder lifting system of the present utility model;

[0016] Figure 2 It is a schematic diagram of the second perspective of the electric oil cylinder lifting system of the present utility model;

[0017] Figure 3 It is a schematic diagram of the structure of the fork carriage assembly of the present utility model;

[0018] Figure 4 It is a left schematic diagram of the electric lifting oil cylinder of the present utility model;

[0019] Figure 5 It is a schematic diagram of the assembly of the piston rod welding part of the present utility model;

[0020] Figure 6 It is a schematic diagram of the control console of the present utility model;

[0021] Figure 7 It is a schematic wiring diagram of the electric oil cylinder lifting system of the present utility model;

[0022] Figure 8 It is a schematic diagram of the base of the lifting oil cylinder of the present utility model;

[0023] In the figure: 1. Outer gantry assembly; 2. Inner gantry assembly; 3. Fork carriage assembly; 31. Fork carriage; 32. Electric distance adjustment oil cylinder; 33. Distance adjustment oil cylinder clamp; 34. Distance adjustment oil cylinder pin; 35. Left fork; 36. Right fork; 37. Distance adjustment oil cylinder locknut; 38. Through shaft; 39. Through shaft baffle; 4. Chain; 5. Pulley assembly; 6. Bracket; 7. Lamp bracket; 8. Left electric lifting oil cylinder; 81. Base of the lifting oil cylinder; 82. Cylinder barrel of the lifting oil cylinder; 83. Assembly of the piston rod welding part; 831. Piston rod; 832. Base of the piston rod; 84. Screw rod of the lifting oil cylinder; 85. Motor; 86. Locknut; 87. Connector of the electric lifting oil cylinder; 9. Right electric lifting oil cylinder; 10. Electric tilting oil cylinder; 11. Pin of the tilting oil cylinder; 12. Clamping plate of the tilting oil cylinder; 13. Control console; 14. Circuit of the electric distance adjustment oil cylinder; 15. Adapter; 16. Hose pulley circuit; 17. Steel pipe assembly; 18. Clamping plate; 19. Circuit of the electric lifting oil cylinder; 20. Circuit of the electric tilting oil cylinder. Detailed Implementation Manner

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] Please refer to Figure 1-8 , in the embodiments of the present utility model, an electric oil cylinder lifting system includes an outer gantry assembly 1, an inner gantry assembly 2 and a fork carriage assembly 3 combined together. An electric lifting oil cylinder is provided between the outer gantry assembly 1 and the inner gantry assembly 2. An electric tilting oil cylinder 10 connected to the vehicle frame is provided on the outer gantry assembly 1, and it is configured that the outer shapes of the electric lifting oil cylinder and the electric tilting oil cylinder 10 are consistent with those of the hydraulic-driven lifting system.

[0026] Specifically, by configuring the outer shapes of the electric lifting oil cylinder and the electric tilting oil cylinder 10 to be the same as those of the hydraulic cylinders of the hydraulic-driven lifting system, on the basis of minimizing the change in the structure of the lifting system, only the hydraulic cylinders can be replaced with electric oil cylinders, which can better adapt to the original lifting system and complete a low-cost and rapid upgrade.

[0027] Please refer to Figure 1 , in one embodiment, preferably, a sprocket is installed on the inner gantry assembly 2. A chain 4 with one end connected to the outer gantry assembly 1 is provided on the outer peripheral surface of the sprocket, and the other end of the chain 4 is connected to the fork carriage assembly 3. Further, under the mutual cooperation of the sprocket and the chain 4, the lifting of the fork carriage assembly 3 can be realized.

[0028] Please refer to Figure 1 , in one embodiment, preferably, the number of the electric tilting oil cylinders 10 is two. The ends of the two electric tilting oil cylinders 10 are both connected to the outer gantry assembly 1 through tilting oil cylinder pins 11. A lamp holder 7 is installed on the outer gantry assembly 1. Two brackets 6 are installed on the outer gantry assembly 1. Clamping plates 18 connected to a steel pipe assembly 17 are installed on the two brackets 6, and the other ends of the two electric tilting oil cylinders 10 are both connected to the vehicle frame through tilting oil cylinder clamping plates 12. An operating console 13 for controlling the forklift to realize the actions of the lifting system is installed in the cab of the vehicle frame.

[0029] Please refer to Figure 2 、 Figure 6 and Figure 7, in one embodiment, preferably, a pulley assembly 5 is mounted on the surface of the inner gantry assembly 2. An electric distance-adjusting cylinder line 14 is provided on the surface of the fork carriage assembly 3, and the electric distance-adjusting cylinder line 14 is connected to a hose pulley line 16 through a transition joint 15. A steel pipe assembly 17 is installed at the end of the hose pulley line 16, and the end of the steel pipe assembly 17 is connected to the wire connected to the console 13; two electric tilt cylinders 10 are connected through an electric tilt cylinder line 20. The electric lifting cylinder includes an electric lifting cylinder left 8 and an electric lifting cylinder right 9, and the electric lifting cylinder left 8 and the electric lifting cylinder right 9 are connected through an electric lifting cylinder line 19.

[0030] Specifically, the sequentially connected electric distance-adjusting cylinder line 14, transition joint 15, hose pulley line 16 and steel pipe assembly 17 are combined into a group of high-pressure pipelines, and there are four groups of high-pressure pipelines identical to it, as Figure 7 shown. The four groups of high-pressure pipelines are a, b, c, and d respectively. The number of electric lifting cylinder lines 19 is two groups, namely g and h. The number of electric tilt cylinder lines 20 is two groups, namely e and f. The console 13 is as Figure 6 shown, and is respectively provided with docking interfaces A, B, C, D, E, F, G, and H. Among them, line a is correspondingly connected to docking interface A, line b is correspondingly connected to docking interface B, line c is correspondingly connected to docking interface C, and the subsequent lines and docking interfaces are all logically connected one by one in sequence. And A and B are connected to the valve rod to realize the movement of the left fork; C and D are connected to the valve rod to realize the movement of the right fork; E and F are connected to the valve rod to realize the tilt of the gantry; G and H are connected to the valve rod to realize the lifting of the gantry.

[0031] Please refer to Figure 3 , in one embodiment, preferably, the fork carriage assembly 3 includes a fork carriage 31 and two electric distance-adjusting cylinders 32 provided on the fork carriage 31. The ends of the two electric distance-adjusting cylinders 32 are respectively connected to a distance-adjusting cylinder clamp 33 through a plug-in distance-adjusting cylinder pin 34. The distance-adjusting cylinder clamp 33 is connected to the fork carriage 31, and the other ends of the two electric distance-adjusting cylinders 32 are respectively connected to the left fork 35 and the right fork 36.

[0032] Specifically, when the electric distance-adjusting cylinder 32 is connected to the left fork 35 and the right fork 36 respectively, the connection is completed through a distance-adjusting cylinder locknut 37 to ensure that the connection between the two is relatively stable. Secondly, a horizontal installation through-shaft 38 on the fork carriage 31 provides support for the ends of the left fork 35 and the right fork 36 to ensure that the left fork 35 and the right fork 36 are stably fixed on the fork carriage 31. And the left fork 35 and the right fork 36 are movably connected to the through-shaft 38. The positions of the left fork 35 and the right fork 36 on the through-shaft 38 are controlled by the electric distance-adjusting cylinder 32. Secondly, through-shaft baffles 39 are installed at both ends of the through-shaft 38 to ensure that the through-shaft 38 is stably fixed on the fork carriage 31 to realize the handling of goods.

[0033] Please refer to Figure 4-5 and Figure 8 , in one embodiment, preferably, the left electric hoisting cylinder 8 includes a hoisting cylinder base 81 mounted on the outer gantry assembly 1 and a motor 85 disposed within the hoisting cylinder base 81. An electric hoisting cylinder connector 87 connected to the motor 85 is provided on the outer peripheral surface of the hoisting cylinder base 81. The end of the hoisting cylinder base 81 is connected to the hoisting cylinder barrel 82. A piston rod welding assembly 83 is provided inside the hoisting cylinder barrel 82. A hoisting cylinder lead screw 84 is mounted on the end face of the motor 85. A locknut 86 is mounted on the end of the piston rod welding assembly 83. The locknut 86 is the main load-bearing component and glue must be added during installation.

[0034] Specifically, the end of the hoisting cylinder base 81 is machined with a stepped surface for mounting on the outer gantry assembly 1, and a counterbore is machined at the end for mounting the motor 85. A round hole is provided on the outer peripheral surface of the hoisting cylinder base 81, and the electric hoisting cylinder connector 87 passes through the round hole to connect with the motor 85. External threads are machined at the other end of the hoisting cylinder base 81, and internal threads are machined at the end of the hoisting cylinder barrel 82 for connection between the two. A fixing block is welded at a position close to the other end for fixing and limiting the left electric hoisting cylinder 8, and a ring is welded at the other end for sealing. The piston rod welding assembly 83 is composed of a piston rod 831 and a piston rod base 832. The piston rod 831 is hollow and external threads are machined at the top for mounting the hoisting cylinder locknut 86. Threaded holes are machined in the inner hole of the piston rod base 832 to ensure the coaxiality of the welding of the two. A flange surface is provided at one end of the motor 85 for connecting and mounting the hoisting cylinder lead screw 84. The electric hoisting cylinder connector 87 is mainly used for connecting the power supply and the controller, can achieve quick plugging and unplugging, and is relatively simple to use and install. The working principle of the left electric hoisting cylinder 8 is that the motor 85 rotates forward and backward, drives the hoisting cylinder lead screw 84 to rotate, and the hoisting cylinder lead screw 84 synchronously drives the piston rod welding assembly 83 to rotate, similar to the working principle of a worm and worm gear, thereby realizing the gantry hoisting function.

[0035] Although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0036] Therefore, the above description is only the preferred embodiment of the present application and is not used to limit the scope of implementation of the present application; that is, all equivalent transformations made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. An electric cylinder lifting system, comprising an outer mast assembly (1), an inner mast assembly (2) and a fork frame assembly (3) which are combined together, characterized in that: An electric lifting cylinder is provided between the outer mast assembly (1) and the inner mast assembly (2), and an electric tilting cylinder (10) connected to the vehicle frame is provided on the outer mast assembly (1), and the appearances of the electric lifting cylinder and the electric tilting cylinder (10) are configured to be consistent with the hydraulically driven lifting system.

2. The electric cylinder lifting system according to claim 1, characterized in that: A pulley assembly (5) is installed on the surface of the inner mast assembly (2), and an electric distance adjustment cylinder circuit (14) is provided on the surface of the fork frame assembly (3). The electric distance adjustment cylinder circuit (14) is connected to a hose pulley circuit (16) through a transition joint (15). A steel pipe assembly (17) is installed at the end of the hose pulley circuit (16), and the end of the steel pipe assembly (17) is connected to an electric wire connected to the operating console (13).

3. The electric cylinder lifting system according to claim 1, characterized in that: A sprocket is installed on the inner mast assembly (2), and a chain (4) is provided on the outer peripheral surface of the sprocket, one end of which is connected to the outer mast assembly (1), and the other end of the chain (4) is connected to the fork frame assembly (3).

4. The electric cylinder lifting system according to claim 2, characterized in that: There are two electric tilt cylinders (10), the ends of the two electric tilt cylinders (10) are connected to the outer mast assembly (1) via a tilt cylinder pin shaft (11), two brackets (6) are installed on the outer mast assembly (1), and the two brackets (6) are installed with a card plate (18) connected to the steel pipe assembly (17), and the other ends of the two electric tilt cylinders (10) are connected to the frame via a tilt cylinder card plate (12), and a control panel (13) for controlling the forklift to realize the action of the lifting system is installed in the cab of the frame.

5. The electric cylinder lifting system according to claim 1, characterized in that: The two electric tilt cylinders (10) are connected via an electric tilt cylinder line (20), the electric lifting cylinder comprises a left electric lifting cylinder (8) and a right electric lifting cylinder (9), and the left electric lifting cylinder (8) and the right electric lifting cylinder (9) are connected via an electric lifting cylinder line (19).

6. The electric cylinder lifting system according to claim 1, characterized in that: The fork frame assembly (3) comprises a fork frame (31) and two electric distance-adjusting cylinders (32) arranged on the fork frame (31), the ends of the two electric distance-adjusting cylinders (32) are connected to the distance-adjusting cylinder clamp (33) by plugging the distance-adjusting cylinder pin shaft (34), the distance-adjusting cylinder clamp (33) is connected to the fork frame (31), and the other ends of the two electric distance-adjusting cylinders (32) are respectively connected to the left fork (35) and the right fork (36).

7. The electric cylinder lifting system according to claim 5, characterized in that: The left electric lifting cylinder (8) comprises a lifting cylinder base (81) mounted on an outer door frame assembly (1) and a motor (85) arranged in the lifting cylinder base (81); the outer peripheral surface of the lifting cylinder base (81) is provided with an electric lifting cylinder connector (87) connected to the motor (85); the end of the lifting cylinder base (81) is connected to the lifting cylinder barrel (82); the interior of the lifting cylinder barrel (82) is provided with a piston rod welding assembly (83); the end surface of the motor (85) is installed with a lifting cylinder screw (84); and the end of the piston rod welding assembly (83) is installed with a locking nut (86).

8. The electric cylinder lifting system according to claim 7, characterized in that: The piston rod welding assembly (83) is composed of a piston rod (831) and a piston rod base (832), wherein the piston rod (831) is hollow, with an external thread processed on the top for installing a lifting cylinder anti-loosening nut (86), and a threaded hole is processed on the inner hole of the piston rod base (832) to ensure the coaxiality of the welding of the two.

9. The electric cylinder lifting system according to claim 1, characterized in that: A lamp holder (7) is installed on the outer door frame assembly (1).

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