Hydraulic cylinder lifting assembly and carrier

Abstract

The hydraulic cylinder lifting assembly comprises a bottom plate, an outer cylinder body, a piston rod, an inner cylinder body, a manual pump, a gear pump and an electromagnetic valve, an oil storage cavity is arranged between the outer cylinder body and the inner cylinder body, the piston rod is arranged in the inner cylinder body in a sliding mode, the manual pump and the gear pump are respectively communicated with the oil storage cavity, and the electromagnetic valve is arranged in the oil storage cavity. Hydraulic oil in the oil storage cavity is conveyed to a high-pressure area at the bottom of the piston rod; the electromagnetic valve is arranged on the bottom plate and communicated with the bottom of the hydraulic cylinder and the oil storage cavity, and when the electromagnetic valve is opened, hydraulic oil in the high-pressure area flows back to the oil storage cavity through the electromagnetic valve to enable the piston rod to descend. The utility model provides a hydraulic cylinder lifting assembly, which is driven by a gear pump and a manual pump, realizes electric and manual lifting, ensures that the hydraulic cylinder lifting assembly can still be used when electric power is insufficient or electrical faults occur, improves the adaptability and reliability of a forklift, and keeps a simple and compact design at the same time.

Description

Technical Field

[0001] This utility model relates to the field of transport vehicle technology, and more specifically, to a hydraulic cylinder lifting assembly and a transport vehicle. Background Technology

[0002] Currently, forklifts on the market can be mainly divided into manual forklifts, semi-electric forklifts, and fully electric forklifts based on their drive system. Manual forklifts rely on human power to push them and use a hydraulic system to manually lift and lower goods. They have a simple structure, low cost, and are suitable for short-distance transport. Semi-electric forklifts use an electric motor to drive them, but lifting still requires manual operation; they are suitable for medium-to-short distance transport. Fully electric forklifts achieve full electrification of both driving and lifting, are easy to operate, and are suitable for long-distance transport. However, when the battery is depleted or the electrical system malfunctions, they will not be able to operate normally, affecting the continuity of operations.

[0003] Therefore, there is an urgent need in the market for a forklift that can be both manually and electrically raised to ensure that it can still work normally when there is insufficient power or electrical system failure. Summary of the Invention

[0004] This utility model aims to address one of the technical problems in related technologies to a certain extent. To this end, this utility model proposes a hydraulic cylinder lifting assembly, which achieves both electric and manual lifting through dual drive of a gear pump and a manual pump. This ensures continued usability even in the event of insufficient power or electrical failure, improving the adaptability and reliability of forklifts while maintaining a simple and compact design.

[0005] This utility model embodiment also proposes a transport vehicle having the above-mentioned hydraulic cylinder lifting assembly.

[0006] The technical solution adopted by this utility model is as follows: a hydraulic cylinder lifting assembly is provided, including a base plate, an outer cylinder, a piston rod, an inner cylinder, a manual pump, a gear pump, and a solenoid valve. The outer cylinder and the inner cylinder are vertically mounted on the base plate, and an oil storage chamber is provided between the outer cylinder and the inner cylinder. The piston rod is slidably disposed in the inner cylinder. The manual pump and the gear pump are respectively connected to the oil storage chamber and are used to transport the hydraulic oil in the oil storage chamber to the high-pressure area at the bottom of the piston rod to push the piston rod upward. The solenoid valve is disposed on the base plate and is connected to the bottom of the hydraulic cylinder and the oil storage chamber. When the solenoid valve is open, the hydraulic oil in the high-pressure area flows back to the oil storage chamber through the solenoid valve, causing the piston rod to descend. When the solenoid valve is closed, the pressure relief oil passage between the bottom of the hydraulic cylinder and the oil storage chamber is cut off to maintain the current position of the piston rod.

[0007] With the above structure, the forklift's lifting system can achieve electric lifting via a gear pump or manual lifting via a manual pump. This improves handling efficiency when power is sufficient and ensures normal operation even when power is insufficient or the electrical system malfunctions, guaranteeing continuous and reliable operation. Furthermore, this simple and compact structure enhances the forklift's adaptability and ease of use without significantly increasing costs, meeting the needs of different working environments.

[0008] According to one embodiment of this utility model, the base plate is provided with gear pump interfaces for the input and output ends of the gear pump; this facilitates the delivery and return of hydraulic oil, ensuring the normal operation of the gear pump. The gear pump adopts a unidirectional pumping method, allowing hydraulic oil to be delivered only from the oil storage chamber to the high-pressure area at the bottom of the piston rod, thereby ensuring the stable lifting and lowering of the hydraulic cylinder and preventing reverse flow of hydraulic oil, thus improving the safety and reliability of the system.

[0009] According to one embodiment of the present invention, a reverse check valve is provided between the gear pump interface and the high-pressure zone; the check valve can effectively prevent hydraulic oil backflow, ensure that the hydraulic cylinder maintains stable pressure control during lifting and lowering, and improve the safety and reliability of the system.

[0010] According to one embodiment of the present invention, an overflow valve is provided in the oil circuit between the reverse check valve and the high-pressure zone; it is used to automatically release excess pressure when the hydraulic system reaches a preset pressure, so as to prevent the system from being damaged due to overpressure.

[0011] According to one embodiment of this utility model, the opening end of the reverse check valve is located on the gear pump interface side, and the closing end of the reverse check valve is located on the high-pressure zone side. This configuration ensures that hydraulic oil can only flow in one direction, from the gear pump to the high-pressure zone through the oil circuit. When hydraulic oil is pumped to the high-pressure zone by the gear pump, the reverse check valve remains open, allowing hydraulic oil to flow into the high-pressure zone. When the hydraulic system stops pumping or the oil pressure reaches a certain value, the reverse check valve automatically closes to prevent hydraulic oil in the high-pressure zone from flowing back to the gear pump interface, thereby maintaining the stability and working pressure of the system and avoiding unnecessary impact or damage to the system caused by oil backflow.

[0012] According to one embodiment of the present invention, the inner cylinder is connected to the outer cylinder via a guide sleeve.

[0013] According to one embodiment of this utility model, a throttle valve is provided in the oil passage between the solenoid valve and the oil reservoir to regulate the flow rate and velocity of the hydraulic oil. The throttle valve can precisely control the rate at which the hydraulic oil flows into the oil reservoir, thereby achieving smooth control of the lifting and lowering speed of the hydraulic cylinder. When the solenoid valve is open, the throttle valve can effectively limit the backflow rate of the hydraulic oil, preventing unstable operation or damage to the hydraulic cylinder due to excessively rapid backflow.

[0014] According to one embodiment of the present invention, a base plate is fixedly installed on the base plate, and the base plate is used to connect the handle of the transport vehicle.

[0015] According to one embodiment of the present invention, the gear pump is installed between the outer cylinder and the manual pump; or

[0016] The gear pump and the manual pump are mounted on both sides of the outer cylinder.

[0017] A transport vehicle comprising any of the hydraulic cylinder lifting assemblies described above. Attached Figure Description

[0018] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a perspective view of the hydraulic cylinder lifting assembly in an embodiment of this utility model.

[0020] Figure 2 This is a cross-sectional view of the hydraulic cylinder lifting assembly in an embodiment of this utility model.

[0021] Figure 3 This is a schematic diagram of the base plate structure when the piston rod is electrically lifted in an embodiment of this utility model.

[0022] Figure 4 This is a schematic diagram of the base plate structure when the piston rod descends in an embodiment of this utility model.

[0023] Figure 5 This is a schematic diagram of the base plate structure when the piston rod is manually lifted in an embodiment of this utility model.

[0024] Explanation of the labels in the diagram:

[0025] 1. Base plate; 2. Outer cylinder; 3. Piston rod; 4. Seat plate; 5. Manual pump; 6. Inner cylinder; 7. Oil reservoir; 8. Guide sleeve; 9. Oil seal; 10. Sealing ring; 11. Gear pump interface;

[0026] 1a. Solenoid valve; 1b. Throttling valve; 1c. Reverse check valve; 1d. Relief valve. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Example 1

[0028] like Figure 1-5 As shown, this embodiment discloses a hydraulic cylinder lifting assembly, including a base plate 1, an outer cylinder 2, a piston rod 3, an inner cylinder 6, a manual pump 5, a gear pump, and a solenoid valve 1a. The outer cylinder 2 and the inner cylinder 6 are vertically mounted on the base plate 1, and an oil storage chamber 7 is provided between the outer cylinder 2 and the inner cylinder 6. The piston rod 3 is slidably disposed in the inner cylinder 6. The manual pump 5 and the gear pump are respectively connected to the oil storage chamber 7 and are used to transport the hydraulic oil in the oil storage chamber 7 to the high-pressure area at the bottom of the piston rod 3 to push the piston rod 3 upward. The solenoid valve 1a is disposed on the base plate 1 and is connected to the bottom of the hydraulic cylinder and the oil storage chamber 7. When the solenoid valve 1a is open, the hydraulic oil in the high-pressure area flows back to the oil storage chamber 7 through the solenoid valve 1a, causing the piston rod 3 to descend. When the solenoid valve 1a is closed, the pressure relief oil passage between the bottom of the hydraulic cylinder and the oil storage chamber 7 is cut off to maintain the current position of the piston rod 3.

[0029] Furthermore, in this embodiment, the outer cylinder 2 and the inner cylinder 6 are arranged with an inner and outer gap, and the bottom ends of both are fixedly connected to the base plate 1, which has an oil passage inside. The outer cylinder 2 and the inner cylinder 6 together form an oil storage chamber 7. A piston rod 3 is slidably installed inside the inner cylinder 6, and the upper end of the piston rod 3 is used to connect to the load, thereby driving the load to rise or fall.

[0030] Furthermore, in this embodiment, a guide sleeve 8 is installed at the upper end of the inner cylinder 6, and the outer periphery of the guide sleeve 8 is welded integrally with the outer cylinder 2. Two oil seals 9 and a sealing ring 10 are installed on the inner wall of the guide sleeve 8; the two oil seals 9 are an outer oil seal 9 and an inner oil seal 9, respectively, and the sealing ring 10 is located between the outer oil seal 9 and the inner oil seal 9. In this embodiment, both the outer cylinder 2 and the inner cylinder 6 are cylindrical.

[0031] Furthermore, in this embodiment, the gear pump is installed between the outer cylinder 2 and the manual pump 5. In other embodiments, the gear pump is installed on the side of the outer cylinder 2 away from the manual pump 5, that is, the gear pump and the manual pump 5 are installed on opposite sides of the outer cylinder 2. In this embodiment, the manual pump 5 pumps the hydraulic oil in the oil reservoir 7 to the high-pressure area by reciprocating the swing of the transport vehicle handle, thereby lifting the piston rod 3.

[0032] Specifically, in combination Figure 3 and Figure 4 As shown, Figure 3The diagram shows a gear pump delivering hydraulic oil from the reservoir 7 to the high-pressure zone, which in turn pushes the piston rod 3 upward, lifting the load and increasing its height. Figure 4 The diagram shows the gear pump returning hydraulic oil from the high-pressure zone to the reservoir 7, lowering the piston rod 3 and thus reducing the load to complete the unloading operation. To ensure the normal operation of the hydraulic system, the base plate 1 is equipped with gear pump interfaces 11 for the input and output ends of the gear pump. These interfaces are connected to the high-pressure zone by a reverse check valve 1c. The reverse check valve 1c prevents hydraulic oil backflow, ensuring stable operation of the hydraulic system. Furthermore, the oil circuit between the reverse check valve 1c and the high-pressure zone is also equipped with a relief valve 1d. The relief valve 1d limits the system pressure, preventing system damage or malfunction due to excessive pressure. The open end of the reverse check valve 1c is located on the gear pump interface 11 side, while the closed end is located on the high-pressure zone side. This design ensures that the hydraulic oil flows only in a predetermined direction, maintaining system stability and efficiency, while improving operational safety and reliability.

[0033] Furthermore, in this embodiment, the main function of the relief valve 1d is to limit the oil circuit pressure, ensuring that the hydraulic system operates within a safe range. For example, when the maximum load capacity of the hydraulic cylinder lifting assembly is set to ten tons, if the actual load exceeds ten tons, the relief valve 1d will automatically open, allowing the hydraulic oil to flow back to the oil storage chamber 7, thereby releasing excessive hydraulic pressure to prevent damage to the hydraulic system due to overload and effectively protecting the stable operation of the lifting assembly. The relief valve 1d is installed on the base plate 1 using a threaded connection. By loosening or tightening the relief valve 1d, the maximum load capacity and pressure release threshold of the system can be adjusted to adapt to different working conditions, improving the flexibility and reliability of the hydraulic system. At the same time, this adjustment method is simple and intuitive, allowing operators to quickly adjust according to specific load conditions during actual use, thereby optimizing the equipment's working efficiency and safety.

[0034] Specifically, in combination Figure 3 and Figure 4 As shown, a throttle valve 1b is provided in the oil passage between the solenoid valve 1a and the oil reservoir 7 to regulate the flow rate and velocity of the hydraulic oil. The throttle valve 1b can precisely control the rate at which the hydraulic oil flows into the oil reservoir 7, thereby achieving smooth control of the lifting speed of the hydraulic cylinder. When the solenoid valve 1a is open, the throttle valve 1b can effectively limit the backflow rate of the hydraulic oil, preventing unstable operation or damage to the hydraulic cylinder due to excessive backflow. A seat plate 4 is fixedly installed on the base plate 1, and the seat plate 4 is used to connect the handle of the transport vehicle.

[0035] In other embodiments, a transport vehicle is disclosed, including the hydraulic cylinder lifting assembly described in this embodiment.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to 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.

[0037] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulic cylinder lifting assembly, characterized in that: The system includes a base plate, an outer cylinder, a piston rod, an inner cylinder, a manual pump, a gear pump, and a solenoid valve. The outer and inner cylinders are vertically mounted on the base plate, and an oil reservoir is provided between them. The piston rod is slidably disposed within the inner cylinder. The manual pump and gear pump are respectively connected to the oil reservoir and are used to deliver hydraulic oil from the oil reservoir to the high-pressure zone at the bottom of the piston rod to push the piston rod upward. The solenoid valve is disposed on the base plate and is connected to the bottom of the hydraulic cylinder and the oil reservoir. When the solenoid valve is open, the hydraulic oil in the high-pressure zone flows back to the oil reservoir through the solenoid valve, causing the piston rod to descend. When the solenoid valve is closed, the pressure relief oil path between the bottom of the hydraulic cylinder and the oil reservoir is cut off to maintain the current position of the piston rod.

2. The hydraulic cylinder lifting assembly according to claim 1, characterized in that: The base plate is provided with gear pump interfaces for the input and output ends of the gear pump.

3. A hydraulic cylinder lifting assembly according to claim 2, characterized in that: A reverse check valve is provided between the gear pump interface and the high-pressure zone.

4. A hydraulic cylinder lifting assembly according to claim 3, characterized in that: An overflow valve is provided in the oil circuit between the reverse check valve and the high-pressure zone.

5. A hydraulic cylinder lifting assembly according to claim 3, characterized in that: The opening end of the reverse check valve is located on the gear pump interface side, and the closing end of the reverse check valve is located on the high-pressure zone side.

6. A hydraulic cylinder lifting assembly according to claim 1, characterized in that: The inner cylinder is connected to the outer cylinder via a guide sleeve.

7. A hydraulic cylinder lifting assembly according to claim 1, characterized in that: A throttle valve is provided in the oil passage between the solenoid valve and the oil storage chamber.

8. A hydraulic cylinder lifting assembly according to claim 1, characterized in that: The base plate is fixedly mounted with a seat plate, which is used to connect the handle of the transport vehicle.

9. A hydraulic cylinder lifting assembly according to claim 1, characterized in that: The gear pump is installed between the outer cylinder and the manual pump; or The gear pump and the manual pump are mounted on both sides of the outer cylinder.

10. A transport vehicle, characterized in that: Includes the hydraulic cylinder lifting assembly as described in any one of claims 1-9.

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