Electric hydraulic jack

Abstract

The utility model relates to the technical field of jacks, and discloses an electric hydraulic jack which comprises a cylinder body seat, a power mechanism and a lifting mechanism, the power mechanism and the lifting mechanism are installed on the cylinder body seat, the power mechanism comprises a gear pump and a motor used for driving the gear pump, and an oil suction port of the gear pump is connected and communicated with an oil storage cavity of the cylinder body seat. An oil outlet of the gear pump is connected and communicated with an oil duct of the cylinder body seat, the lifting mechanism comprises a lifting piston and a piston cylinder, the lifting piston is installed in the piston cylinder, the piston cylinder is installed in the cylinder body seat, and the oil duct of the cylinder body seat is communicated with an inner cavity of the piston cylinder. Through the combination of the motor and the gear pump, hydraulic oil is used as an energy conduction medium to enable the lifting piston to move in a reciprocating mode, and therefore the lifting function is achieved.

Description

Technical Field

[0001] This utility model relates to the field of jack technology, and more specifically to an electric hydraulic jack. Background Technology

[0002] Currently, most electric pallet trucks and electric stackers on the market use a separate design for their hydraulic systems, consisting of a power unit and a hydraulic cylinder. This design has several drawbacks: First, the separate design requires additional connecting joints and pipelines, which greatly increases the risk of hydraulic oil leakage. Once a leak occurs, it will not only affect the normal operation of the equipment but may also pollute the working environment. Second, the added joints and pipelines significantly increase the complexity of the system, occupy more space, and make the overall design more complex, increasing the difficulty of equipment manufacturing and maintenance. Third, the additional joints and pipelines increase production costs and reduce the product's market competitiveness. Utility Model Content

[0003] In view of this, the present invention provides an electric hydraulic jack that uses a combination of a motor and a gear pump, with hydraulic oil as the energy transmission medium, to make the lifting piston reciprocate, thereby achieving the lifting function.

[0004] To achieve the above objectives, the present invention provides an electric hydraulic jack, comprising a cylinder base and a power mechanism and a lifting mechanism mounted on the cylinder base. The power mechanism includes a gear pump and a motor for driving the gear pump. The oil inlet of the gear pump is connected and communicates with the oil storage chamber of the cylinder base, and the oil outlet of the gear pump is connected and communicates with the oil passage of the cylinder base. The lifting mechanism includes a lifting piston and a piston cylinder. The lifting piston is installed inside the piston cylinder, and the piston cylinder is installed inside the cylinder base. The oil passage of the cylinder base communicates with the inner cavity of the piston cylinder.

[0005] Preferably, a speed limiting valve, a one-way valve, and a descent solenoid valve assembly are provided between the oil outlet of the gear pump and the oil passage of the cylinder block.

[0006] Preferably, the mounting hole for the speed limit valve on the cylinder block is sealed with a plug.

[0007] Preferably, the descending solenoid valve assembly includes a solenoid valve and a descending valve core, wherein the descending valve core is installed inside the solenoid valve.

[0008] Preferably, the other end of the solenoid valve on which the lowering valve core is mounted is provided with a cap.

[0009] Preferably, a vent valve is provided on the outer side of the cylinder block seat, which communicates with the oil storage chamber of the cylinder block seat, and a gasket is provided between the vent valve and the cylinder block seat.

[0010] Preferably, a dustproof sealing ring, a leak-proof sealing ring, and a guide ring are installed on the inner wall of the piston cylinder, and an O-ring is installed on the outer wall of the piston cylinder.

[0011] Preferably, the dustproof sealing ring, the leak-proof sealing ring, and the guide ring are located between the inner wall of the piston cylinder and the outer wall of the lifting piston.

[0012] Preferably, the gear pump and motor are fixed to the cylinder block by bolts.

[0013] As can be seen from the above technical solution, compared with the prior art, the electric hydraulic jack of this utility model, compared with the existing traditional hydraulic devices with separate power units and cylinders, integrates the power mechanism and cylinder seat into a whole, making the structure more compact and occupying less space. This is conducive to the miniaturization and integration of the equipment. The oil is supplied by a gear pump, eliminating additional pipelines and joints, fundamentally avoiding the hydraulic oil leakage problem caused by pipelines and joints, improving the reliability and stability of the equipment, and reducing maintenance costs. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0015] Figure 1 This is an exploded view of the structure of the electric hydraulic jack of this utility model;

[0016] Figure 2 This is a schematic diagram of the working process of the electric hydraulic jack of this utility model.

[0017] Explanation of reference numerals in the attached diagram: 1-vent valve; 2-gasket; 3-motor; 4-gear pump; 5-bolt; 6-plug one; 7-plug two; 8-speed limiter valve; 9-check valve; 10-cap; 11-solenoid valve; 12-lowering valve core; 13-lifting piston; 14-piston cylinder; 15-O-ring; 16-cylinder seat; 17-dustproof seal; 18-leakage seal; 19-guide ring. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of an exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] Please see the appendix Figure 1-2 This is the electric hydraulic jack disclosed in this utility model.

[0020] The electric hydraulic jack provided by this utility model includes a cylinder base 16, a power mechanism, a lifting mechanism, and a control mechanism. The cylinder base 16 provides an assembly base for each part and also serves as an oil storage chamber and hydraulic oil passage. The power mechanism, lifting mechanism, and control mechanism are installed on the cylinder base 16 to form an integral structure. Driven by the power mechanism, the lifting mechanism performs lifting and reciprocating motions using hydraulic oil as the energy transmission medium, thereby realizing the lifting function.

[0021] The lifting mechanism is mainly assembled from the lifting piston 13 and the piston cylinder 14.

[0022] The dustproof sealing ring 17, the leak-proof sealing ring 18, and the guide ring 19 are sequentially installed in the corresponding grooves inside the piston cylinder 14, as follows: Figure 1 As shown, two leak-proof sealing rings 18 and two guide rings 19 are provided, and the leak-proof sealing rings 18 and guide rings 19 are alternately arranged. The O-ring 15 is installed in the corresponding groove on the outside of the piston cylinder 14, thereby forming a piston cylinder assembly. The lifting piston 13 is installed inside the piston cylinder assembly. The piston cylinder assembly is installed inside the cylinder seat 16.

[0023] The piston cylinder 14 serves as a carrier for mounting the lifting piston 13; the grooves on the inner and outer surfaces of the piston cylinder 14 are used to install the guide ring 19 and various sealing rings.

[0024] The guide ring 19 is installed in the corresponding groove on the inner surface of the piston cylinder 14 to support the lifting piston 13, maintain the gap between it and the inner wall of the piston cylinder 14 when it slides up and down, and prevent damage caused by hard friction on the metal surface.

[0025] Leak-proof sealing ring 18 is installed in the corresponding groove on the inner surface of piston cylinder 14 to ensure the seal between piston cylinder 14 and lifting piston 13 and prevent hydraulic oil leakage. Dustproof sealing ring 17 is installed in the corresponding groove on the inner surface of piston cylinder 14 to prevent dust, sewage and other impurities from entering the oil chamber.

[0026] O-ring 15 is installed in the corresponding groove on the outer surface of piston cylinder 14, such as Figure 1 Points A and B shown ensure a seal between piston cylinder 14 and cylinder seat 16, preventing hydraulic oil leakage.

[0027] The power mechanism is mainly composed of motor 3 and gear pump 4.

[0028] Motor 3 is used to drive gear pump 4. The output shaft of motor 3 is inserted into gear pump 4, and the end face of input shaft of gear pump 4 is aligned with the opening of end face of output shaft of motor 3. It is fixed to the corresponding mounting surface of cylinder block seat 16 with bolts 5. The oil holes are aligned so that the oil outlet of gear pump 4 is connected and communicated with the oil passage of cylinder block seat 16.

[0029] The control mechanism is mainly assembled from a speed limiting valve 8, a one-way valve 9, and a descent solenoid valve assembly.

[0030] The descent solenoid valve assembly is composed of a cap 10, a solenoid valve 11 and a descent valve core 12. The cap 10 is installed on the other end of the solenoid valve 11 where the descent valve core 12 is located, and is used for the assembly and sealing of the solenoid valve 11 and the descent valve core 12. The descent solenoid valve assembly is assembled in the corresponding hole of the cylinder seat 16.

[0031] Speed ​​limit valve 8 and plug 2 7 are installed in the corresponding holes of cylinder seat 16 in sequence. Speed ​​limit valve 8 is located after the lowering valve core 12 to ensure stable hydraulic oil flow and prevent damage to the jack assembly caused by excessive speed when the lifting piston 13 descends. Plug 2 7 is used to seal the mounting hole of speed limit valve 8.

[0032] One-way valve 9 is assembled in the corresponding hole of cylinder block seat 16;

[0033] It should be noted that a vent valve 1 is provided on the outside of the cylinder seat 16, which is connected to the oil storage chamber of the cylinder seat 16. A gasket 2 is provided between the vent valve 1 and the cylinder seat 16. The vent valve 1 and the gasket 2 are sequentially installed in the corresponding holes of the cylinder seat 16. The vent valve 1 is connected to the oil storage chamber, which ensures that the pressure in the oil storage chamber of the cylinder seat 16 is dynamically balanced with the atmospheric pressure, while also having a certain dustproof and waterproof function. The gasket 2 prevents hydraulic oil from leaking from the threads.

[0034] Plug 6 is assembled into the corresponding hole in cylinder block seat 16. Plug 6 is used to seal the machining process hole.

[0035] The working principle of the electric hydraulic jack of this utility model is as follows:

[0036] ① Lifting operation:

[0037] When motor 3 is powered on, the motor shaft rotates, driving gear pump 4 to start working. Hydraulic oil in the oil storage chamber of cylinder seat 16 is drawn in through the oil suction port of gear pump 4, and after being pressurized, it flows from the oil outlet of gear pump 4 to the oil passage of cylinder seat 16. The hydraulic oil flows through one-way valve 9 to the inner cavity of piston cylinder 14, acting on lifting piston 13 to make it slide upward, thus realizing the lifting action.

[0038] The one-way valve 9 prevents the hydraulic oil under high pressure from flowing back into the oil storage chamber and causing a drop in oil pressure when the solenoid valve 11 is not energized and the lowering valve core 12 is in the closed state (i.e., the return oil circuit is not open), which would cause the lifting piston 13 to slide down and fall back under the action of external pressure.

[0039] ② Descent action:

[0040] The lowering valve core 12 connects to the return oil circuit of the piston cylinder 14. When the solenoid valve 11 is not energized, the return oil circuit is closed; when the solenoid valve 11 is energized, the lowering valve core 12 opens, and the return oil circuit is open. The opening / closing of the lowering valve core 12 is controlled by controlling the energization / de-energization of the solenoid valve 11, thereby controlling the on / off state of the return oil circuit. When the return oil circuit is open, the hydraulic oil in the piston cylinder 14 flows back to the cylinder seat 16 housing through the lowering valve core 12 and the speed limiting valve 8, realizing hydraulic oil pressure relief. The lifting piston 13 slides down and falls back under the action of external pressure, completing the lowering process.

[0041] like Figure 2 As shown, the working process of the electric hydraulic jack of this utility model is as follows:

[0042] ① Lifting process: When the motor 3 is powered on, it drives the gear pump 4 to pump oil; the hydraulic oil in the oil storage chamber is pressurized by the gear pump 4 and passes to the check valve 9; the hydraulic oil passes to the hydraulic piston cylinder 14 through the check valve 9, and the oil pressure acts on the lifting piston 13, causing it to slide upward and complete the lifting process.

[0043] ②Descent process: When the solenoid valve 11 is de-energized, it is in a closed state, and the return oil circuit is closed, so the lifting piston 13 is in a stationary state; when the solenoid valve 11 is energized, the valve port switches to the open state, and the hydraulic oil in the hydraulic cylinder flows back to the oil storage chamber through the solenoid valve 11 and the speed limit valve 8. The oil pressure in the piston cylinder 14 drops, and the lifting piston 13 slides downward under the action of external force, completing the descending process.

[0044] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electric hydraulic jack, characterized in that, The device includes a cylinder block (16) and a power mechanism and a lifting mechanism mounted on the cylinder block (16). The power mechanism includes a gear pump (4) and a motor (3) for driving the gear pump (4). The oil inlet of the gear pump (4) is connected to and communicates with the oil storage chamber of the cylinder block (16). The oil outlet of the gear pump (4) is connected to and communicates with the oil passage of the cylinder block (16). The lifting mechanism includes a lifting piston (13) and a piston cylinder (14). The lifting piston (13) is installed inside the piston cylinder (14). The piston cylinder (14) is installed inside the cylinder block (16). The oil passage of the cylinder block (16) communicates with the inner cavity of the piston cylinder (14).

2. The electro-hydraulic jack according to claim 1, characterized in that, A speed limiting valve (8), a one-way valve (9), and a descent solenoid valve assembly are provided between the oil outlet of the gear pump (4) and the oil passage of the cylinder block seat (16).

3. The electro-hydraulic jack according to claim 2, characterized in that, The mounting hole for the speed limit valve (8) on the cylinder block seat (16) is sealed with a plug (7).

4. The electro-hydraulic jack according to claim 2, characterized in that, The descending solenoid valve assembly includes a solenoid valve (11) and a descending valve core (12), the descending valve core (12) being installed inside the solenoid valve (11).

5. The electro-hydraulic jack according to claim 4, characterized in that, The other end of the solenoid valve (11) on which the lowering valve core (12) is mounted is provided with a cap (10).

6. The electro-hydraulic jack according to claim 1, characterized in that, The cylinder seat (16) is provided with a vent valve (1) that connects to the oil storage chamber of the cylinder seat (16) on the outside, and a gasket (2) is provided between the vent valve (1) and the cylinder seat (16).

7. The electro-hydraulic jack according to claim 1, characterized in that, The piston cylinder (14) is equipped with a dustproof sealing ring (17), a leak-proof sealing ring (18) and a guide ring (19) on its inner side wall, and an O-ring (15) is installed on its outer side wall.

8. The electro-hydraulic jack according to claim 7, characterized in that, The dustproof sealing ring (17), the leak-proof sealing ring (18), and the guide ring (19) are located between the inner wall of the piston cylinder (14) and the outer wall of the lifting piston (13).

9. The electro-hydraulic jack according to claim 1, characterized in that, The gear pump (4) and the motor (3) are fixed to the cylinder block seat (16) by bolts (5).

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