Electric oil cylinder for mobile machine and mobile machine

Abstract

The electric oil cylinder comprises an oil cylinder body, an oil pump, a motor, a plunger rod and a valve system, the valve system is used for controlling oil supply and oil return processes, the oil cylinder body comprises an outer cylinder barrel, a bottom valve plate, a guide sleeve and an inner cylinder barrel, the outer cylinder barrel and the inner cylinder barrel are coaxially arranged, and the bottom valve plate is arranged on the outer cylinder barrel. The upper ends of the outer cylinder barrel and the inner cylinder barrel are connected with the guide sleeve, the lower ends of the outer cylinder barrel and the inner cylinder barrel are connected with the bottom valve plate, and a sealing interlayer space serving as an oil tank is formed between the outer cylinder barrel and the inner cylinder barrel. According to the electric oil cylinder for the mobile machinery, the oil tank adopts a sealing interlayer design, so that the space is effectively utilized, the storage capacity of oil is enhanced, and the stability of a system in long-time use is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electric cylinders using batteries as power sources, especially electric cylinders used in conjunction with mobile machinery, such as hand-propelled electric lift stackers, hand-propelled electric lift platform vehicles, etc., and also relates to executive working cylinders in similar machinery. The key technology is the integration of the motor, oil pump, cylinder body, working valve, control valve, etc. Background Art

[0002] The existing devices used for gravity lifting in similar mobile machinery widely use hydraulic lifting cylinders or actuator cylinders, such as all-electric stackers, semi-electric stackers, etc. Their lifting and hoisting systems generally include: a hydraulic system consisting of a fluid supply station, referred to as a hydraulic station, a group of separate hydraulic lifting cylinders, and then the two are connected using an external oil pipe to form a complete set of hydraulic system lifting. This type of technical system is complicated, has a large duty cycle, a high probability of leakage, and a high cost.

[0003] Of course, in fixed machinery, there are also mature integrated electric cylinders that are widely used as actuators. However, this type of electric cylinder is not suitable for use in mobile machinery due to its large size and heavy weight. Summary of the invention

[0004] The utility model aims to solve one of the technical problems in the related art to a certain extent. To this end, the utility model proposes an electric oil cylinder for mobile machinery, whose oil tank adopts a sealed sandwich design, which not only effectively utilizes the space, but also enhances the storage capacity of the oil, ensuring the stability of the system in long-term use.

[0005] The utility model also provides a mobile machine with the electric oil cylinder.

[0006] The technical solution adopted by the utility model is: to provide an electric cylinder for mobile machinery, including a cylinder body, an oil pump, a motor, a plunger rod and a valve system for controlling the oil supply and oil return process, the cylinder body includes an outer cylinder barrel, a bottom valve plate, a guide sleeve and an inner cylinder barrel, the outer cylinder barrel is coaxially arranged with the inner cylinder barrel, and the upper ends of both are connected to the guide sleeve, and the lower ends are connected to the bottom valve plate, and a sealed interlayer space serving as an oil tank is provided between the outer cylinder barrel and the inner cylinder barrel.

[0007] After adopting the above structure, the oil tank adopts a sealed sandwich design, which not only effectively utilizes the space, but also enhances the storage capacity of the oil, ensuring the stability of the system during long-term use. The structure is simple and compact, and the weight is light.

[0008] According to an embodiment of the utility model, the oil cylinder body is installed with a rotary control valve, and the rotary control valve is used to regulate the flow of oil from the inner cylinder to the oil tank; thereby achieving the purpose of the rotary control valve regulating the descending speed of the plunger rod.

[0009] According to one embodiment of the utility model, the rotary control valve includes a rotary valve body, the rotary valve body passes through the outer cylinder and is connected to the inner cylinder, the inner cylinder is provided with a valve port, the rotary valve body is provided with a first oil return hole, and the valve port, the rotary valve body and the first oil return hole are combined to form a first oil return channel.

[0010] According to one embodiment of the utility model, the rotary control valve also includes a rotary valve rod and a steel ball, the rotary valve rod is connected to the rotary valve body, and the steel ball is located between the rotary valve rod and the valve port; when rotating clockwise, the rotary valve rod contacts the steel ball so that the steel ball fits the valve port, and the oil in the inner cylinder cavity is prevented from communicating with the outside, and the rotary control valve is in a closed state; when rotating counterclockwise, the rotary valve rod moves away from the steel ball, so that the steel ball leaves the valve port, and the oil in the inner cylinder flows out of the valve port and flows back to the oil tank through the first oil return port. The descending speed of the plunger rod is related to the size of the rotary valve rod rotation angle. The smaller the rotation angle, the smaller the gap between the steel ball and the flow rate, and the slower the descending speed. Conversely, the faster the descending speed, the faster the descending speed.

[0011] According to an embodiment of the utility model, a third oil seal is provided on the outer periphery of the rotary valve stem; the third oil seal is used to prevent oil from leaking out.

[0012] According to an embodiment of the utility model, a welding nut is fixedly installed on the outer side wall of the inner cylinder, and the rotary valve body passes through the outer cylinder and is connected to the welding nut.

[0013] According to an embodiment of the utility model, the bottom valve plate is provided with a connecting ear, and the oil pump is connected to the connecting ear.

[0014] According to an embodiment of the utility model, the guide sleeve is equipped with a first oil seal, a second oil seal and a dust seal; and / or

[0015] The lower end of the plunger rod is provided with a limiting hole; and / or

[0016] An oil tank port is provided on the surface of the outer cylinder barrel, and the oil tank port is connected to the oil pump through a connecting pipe.

[0017] According to an embodiment of the utility model, the guide sleeve is provided with a second oil return hole; and / or

[0018] The motor is connected to the outer cylinder via a pipe hoop.

[0019] A mobile machine comprises any one of the electric cylinders described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A three-dimensional diagram of an electric cylinder in an embodiment of the utility model;

[0022] Figure 2 This is a structural diagram of the electric cylinder in the embodiment of the utility model;

[0023] Figure 3 This is an isometric view of the electric cylinder in the embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the electric cylinder in the embodiment of the utility model;

[0025] Figure 5 This is a schematic diagram of the partial structure of the upper part of the electric cylinder in the embodiment of the utility model;

[0026] Figure 6 This is a schematic diagram of the local structure of the lower part of the electric cylinder in the embodiment of the utility model;

[0027] Figure 7 for Figure 4 Sectional view at AA in the middle;

[0028] Figure 8 This is a hydraulic principle diagram of the electric cylinder in the embodiment of the utility model;

[0029] Fig. 9 This is a combined stereogram of the oil pump and the motor in the embodiment of the utility model;

[0030] Fig.10 It is a stereoscopic diagram of the connecting pipe in the embodiment of the utility model.

[0031] Description of the numbers in the figure:

[0032] 10. Oil cylinder body; 20. Oil pump; 30. Motor; 40. Plunger rod; 50. Rotary control valve; 60. Connecting pipe;

[0033] 11. Outer cylinder; 12. Bottom valve plate; 13. Check valve; 14. Overflow valve; 15. Guide sleeve; 16. Inner cylinder;

[0034] 11a, fuel tank port;

[0035] 12a, connecting ear;

[0036] 15a, second oil return hole; 15b, first oil seal; 15c, second oil seal; 15d, dust ring;

[0037] 16a, valve port; 16b, oil plug screw;

[0038] 21. hinge bolt; 22. first sealing gasket; 23. second sealing gasket;

[0039] 31. Pipe clamp;

[0040] 41. Limiting hole;

[0041] 51. Rotary valve stem; 52. Rotary valve body; 53. Steel ball; 54. Welding nut; 55. Third oil seal;

[0042] 52a. First oil return hole. DETAILED DESCRIPTION

[0043] 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. Embodiment 1

[0044] like Figure 1-10 As shown, in this embodiment, an electric cylinder for mobile machinery is disclosed, including a cylinder body 10, an oil pump 20, a motor 30, a plunger rod 40 and a valve system for controlling the oil supply and oil return process, the cylinder body 10 includes an outer cylinder barrel 11, a bottom valve plate 12, a guide sleeve 15 and an inner cylinder barrel 16, the outer cylinder barrel 11 and the inner cylinder barrel 16 are coaxially arranged, and the upper ends of both are connected to the guide sleeve 15, and the lower ends are connected to the bottom valve plate 12, and a sealed interlayer space serving as an oil tank is provided between the outer cylinder barrel 11 and the inner cylinder barrel 16.

[0045] Furthermore, in the present embodiment, the oil cylinder body 10 is integrated by welding, and includes an outer cylinder barrel 11, a bottom valve plate 12, a guide sleeve 15 and an inner cylinder barrel 16. The interlayer space between the inner cylinder barrel 16 and the outer cylinder barrel 11 is used as an oil tank. The guide sleeve 15 is used as a supporting member of the plunger rod 40, mainly to support the plunger. Three oil seals are arranged from top to bottom. The upper oil seal is a dust ring 15d, which prevents external dust particles from entering the cylinder; the axial position of the second oil seal 15c is higher than the position of the second oil return hole 15a, which prevents the oil at the second oil return hole 15a from leaking out; the first oil seal 15b is the main oil seal, which seals between the inner cylinder barrel 16 and the plunger.

[0046] Further, in this embodiment, the bottom valve plate 12 is rectangular, and two adjacent sides thereof are respectively provided with a one-way valve 13 and a relief valve 14. The inner diameter of the outer cylinder 11 is larger than the outer diameter of the inner cylinder 16, the upper end of the outer cylinder 11 is welded to the outer periphery of the guide sleeve 15, and the upper end of the inner cylinder 16 is welded to the lower end of the guide sleeve 15. The lower ends of the inner cylinder 16 and the outer cylinder 11 are both welded to the upper surface of the bottom valve plate 12. A group of cavities are formed between the inner cylinder 16 and the outer cylinder, and the cavities are used for storing liquid, that is, they are provided as an oil tank.

[0047] Furthermore, the bottom valve plate 12 is provided with a connecting ear 12a, which is formed by extending outward from one side of the bottom valve plate 12, and the oil pump 20 is connected to the connecting ear 12a. The connecting ear 12a has an oil path leading to the one-way valve 13, the overflow valve 14, and the oil path leading to the oil cylinder, the oil tank, etc. Referring to the hydraulic principle diagram, the connecting ear 12a is connected by a hinge bolt 21 to: be used for mechanical connection and fixing the oil pump 20, and also serve as a connection for oil.

[0048] Furthermore, combined with Figure 2 As shown, in this embodiment, the oil pump 20 is fixed to the connecting ear 12a by the hinge bolt 21 passing through the connecting ear 12a and connecting with the oil pump 20. A first sealing gasket 22 is provided between the connecting ear 12a and the oil pump 20, and a second sealing gasket 23 is provided between the head of the connecting bolt and the connecting ear 12a. The connecting bolt passes through the second sealing gasket 23 and the first sealing gasket 22 in sequence.

[0049] Furthermore, an oil filling port is provided in the middle section of the outer cylinder 11, which is both an oil filling port and an oil mark indicating port, and is usually blocked by an oil plug screw 16b. A set of ball-type manual oil return rotary valve bodies 52 are provided near the upper section of the outer cylinder 11, which generally refers to the high-level operation position, and the rotary valve body 52 is then installed with a steel ball 53 and a rotary valve rod 51, that is, a manual knob control valve is formed.

[0050] Specifically, combined Figure 5 and Figure 7As shown, the rotary control valve 50 includes a rotary valve body 52, which passes through the outer cylinder 11 and is connected to the inner cylinder 16. The inner cylinder 16 is provided with a valve port 16a, and the rotary valve body 52 is provided with a first oil return hole 52a. The valve port 16a, the rotary valve body 52 and the first oil return hole 52a are combined to form a first oil return channel. The rotary control valve 50 also includes a rotary valve rod 51 and a steel ball 53, wherein the rotary valve rod 51 is connected to the rotary valve body 52, and the steel ball 53 is located between the rotary valve rod 51 and the valve port 16a; when rotating clockwise, the rotary valve rod 51 contacts the steel ball 53 so that the steel ball 53 fits the valve port 16a, and the oil in the inner cylinder 16 cavity is prevented from communicating with the outside, and the rotary control valve 50 is in a closed state; when rotating counterclockwise, the rotary valve rod 51 moves away from the steel ball 53, so that the steel ball 53 leaves the valve port 16a, and the oil in the inner cylinder 16 flows out of the valve port 16a and flows back to the oil tank through the first oil return port. The descending speed of the plunger rod 40 is related to the rotation angle of the rotary valve rod 51. If the rotation angle is small, the gap between the steel ball 53 is small, the flow rate is small, and the descending speed is slow. Conversely, the descending speed is fast.

[0051] Furthermore, combined with Figure 6 As shown, in this embodiment, the plunger rod 40 is placed in the oil cylinder for the extension work of the electric oil cylinder. A limit hole 41 is provided at the lower end of the plunger rod 40. When the plunger rod 40 rises to the limit hole 41 and passes through the first oil seal 15b, the oil in the inner cylinder 16 flows back to the oil tank from the second oil return hole 15a on the guide sleeve 15 through this hole, thereby limiting the plunger from continuing to rise, playing a limiting role, and eliminating the risk of the plunger rod 40 being completely pushed out in the event of misoperation.

[0052] Furthermore, in the present embodiment, the oil pump 20 is driven by the motor 30, which is a hydraulic source generating device, and its shaft is connected to the motor 30 for transmitting power. The oil pump 20 has an oil suction port and an oil discharge port. The oil suction port is connected to the oil tank port 11a on the lower surface of the outer cylinder 11 through a pipe joint connecting pipe 60, and the oil tank port 11a is connected to the oil pump 20 through the connecting pipe 60; the oil discharge port is fixed and connected to the connecting ear 12a of the lower bottom valve plate 12 of the combined oil cylinder body 10 through a hinge bolt 21, a first sealing gasket 22, and a second sealing gasket 23.

[0053] Specifically, the outer circumference of the portion of the rotary valve stem 51 extending into the rotary valve body 52 is provided with an annular groove, in which a third oil seal 55 is installed; the third oil seal 55 is used to prevent oil leakage. A welding nut 54 is fixedly installed on the outer wall of the inner cylinder 16, and the rotary valve body 52 passes through the outer cylinder 11 and is connected to the welding nut 54. The motor 30 is connected to the outer cylinder 11 through a pipe clamp 31.

[0054] Furthermore, combined with Figure 8As shown in the figure, the external force G is the external force or the weight of the cargo. In this embodiment, the working principle of the electric cylinder is as follows:

[0055] Electric cylinder lifting: When the motor 30 is energized, the motor 30 rotates to drive the oil pump 20 to do work, and the oil is sucked into the oil suction port from the oil tank port 11a through the pipe connecting pipe 60, and then the oil is discharged from the oil outlet end of the oil pump 20, and finally enters the inner cylinder 16 through the hinge bolt 21 and the bottom valve plate 12, acting on the plunger rod 40, thereby causing the plunger rod 40 to perform a top extension movement.

[0056] After the oil enters the bottom valve plate 12, it first acts on the one-way valve 13. After the one-way valve 13 is opened by the liquid flow, it enters the inner cylinder 16 and also acts on the relief valve 14. When the external force is greater than the set value, the liquid pressure also increases to the opening point of the relief valve 14. At this time, the liquid flows back to the oil tank after overflowing to protect the safety of the system.

[0057] In order to avoid misoperation and failure to cut off the motor 30 switch in time, the plunger rod 40 will continue to extend when the motor 30 continues to work, which may cause the plunger rod 40 to fall out. A limit hole 41 is set at the lower end of the plunger rod 40. Its limiting principle is: when the plunger rod 40 rises to the limit hole 41 and exceeds the first oil seal 15b, the oil flows back to the oil tank from the second oil return hole 15a on the guide sleeve 15 through the limit hole 41. Thereafter, the plunger rod 40 no longer extends outward, thereby playing a role of safety limit stop.

[0058] When the motor 30 stops rotating and the pump also stops pumping oil, the one-way valve 13 is closed by the back pressure of the liquid in the inner cylinder 16, so that the oil in the inner cylinder 16 maintains the current state, and the plunger stops moving and maintains the current state;

[0059] Electric oil cylinder descends: Turn the rotary control valve 50 counterclockwise, the oil in the oil cylinder flows back to the oil tank through the first oil return port, and the oil cylinder retracts. The rotary control valve has two working states:

[0060] State 1: When the valve is rotated clockwise to the limit, the valve stem 51 presses against the steel ball 53, thereby blocking the valve port 16a, so that the cavity in the inner cylinder 16 is in a closed state. According to the flow of oil, the plunger rod 40 stretches or moves statically;

[0061] State 2: Rotate the rotary valve rod 51 counterclockwise, the rotary valve rod 51 leaves the steel ball 53, and the steel ball 53 also leaves the valve port 16a, and the current valve port 16a is in an open state. The liquid in the inner cylinder 16 flows back to the oil tank through the first oil return port, and the plunger retracts.

[0062] The opening of the valve port 16a is related to the amount of oil return and the angle of the rotary valve stem 51, thereby controlling the retraction or descent speed of the plunger according to the operator's wishes, and the speed is steplessly controlled.

[0063] Furthermore, in other embodiments, a mobile machine is disclosed, including the electric oil cylinder described in this embodiment, wherein the mobile machine includes a hand-propelled electric lift stacker, a hand-propelled electric lift platform truck, and the like.

[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 the present invention.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An electric cylinder for mobile machinery, characterized in that: It includes an oil cylinder body, an oil pump, a motor, a plunger rod and a valve system for controlling the oil supply and oil return process. The oil cylinder body includes an outer cylinder barrel, a bottom valve plate, a guide sleeve and an inner cylinder barrel. The outer cylinder barrel and the inner cylinder barrel are coaxially arranged, and the upper ends of both are connected to the guide sleeve, and the lower ends are connected to the bottom valve plate. There is a sealed interlayer space between the outer cylinder barrel and the inner cylinder barrel as an oil tank.

2. The electric cylinder for mobile machinery according to claim 1, characterized in that: The oil cylinder body is equipped with a rotary control valve, and the rotary control valve is used to regulate the flow rate of oil from the inner cylinder to the oil tank.

3. The electric cylinder for mobile machinery according to claim 2, characterized in that: The rotary control valve includes a rotary valve body, which passes through the outer cylinder and is connected to the inner cylinder. The inner cylinder is provided with a valve port, and the rotary valve body is provided with a first oil return hole. The valve port, the rotary valve body and the first oil return hole form a first oil return channel.

4. The electric cylinder for mobile machinery according to claim 3, characterized in that: The rotary control valve further comprises a rotary valve stem and a steel ball. The rotary valve stem is connected to the rotary valve body, and the steel ball is located between the rotary valve stem and the valve port.

5. The electric cylinder for mobile machinery according to claim 4, characterized in that: A third oil seal is arranged on the outer periphery of the rotary valve stem.

6. The electric cylinder for mobile machinery according to claim 3, characterized in that: A welding nut is fixedly mounted on the outer side wall of the inner cylinder, and the rotary valve body passes through the outer cylinder and is connected to the welding nut.

7. The electric cylinder for mobile machinery according to claim 1, characterized in that: The bottom valve plate is provided with a connecting ear, and the oil pump is connected to the connecting ear.

8. The electric cylinder for mobile machinery according to claim 1, characterized in that: The guide sleeve is equipped with a first oil seal, a second oil seal and a dust seal; and / or The lower end of the plunger rod is provided with a limiting hole; and / or The outer cylinder surface is provided with an oil tank port, and the oil tank port is connected to the oil pump through a connecting pipe.

9. The electric cylinder for mobile machinery according to claim 1, characterized in that: The guide sleeve is provided with a second oil return hole; and / or The motor is connected to the outer cylinder via a pipe hoop.

10. A mobile machine, characterized in that: It comprises the electric cylinder as described in any one of claims 1 to 9.

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