Light electric hydraulic tool with external oil bag

Abstract

The utility model provides a light electric hydraulic tool with an external oil bag, which comprises a motor shell component, a plunger pump component and an oil cylinder component, the plunger pump component and the oil cylinder component are arranged on the motor shell component, a driving motor is mounted in the motor shell component, and the oil cylinder component comprises an oil cylinder and an actuating rod. The plunger pump assembly comprises a plunger shell connected to the front end of the motor shell assembly, an eccentric shaft and a pump body, the eccentric shaft and the pump body are arranged in the plunger shell, the eccentric shaft is connected to the driving motor, the pump body is fixed to an oil inlet, close to the oil cylinder, of the eccentric shaft, an oil bag oil inlet is formed inwards from the outer side of the plunger shell, and the inner end of the oil bag oil inlet is communicated with the pump body. An external oil bag is installed on the outer side of the plunger shell, the oil inlet end of the external oil bag is connected to an oil inlet of the oil bag and communicated with an oil way of an oil outlet of the oil cylinder, and when the pump body works, oil suction and oil discharge of the oil cylinder towards the external oil bag are completed through the oil inlet of the oil bag.

Description

Technical Field

[0001] This utility model relates to the field of electric hydraulic tools, and in particular to a lightweight electric hydraulic tool with an external oil bag. Background Technology

[0002] The oil reservoir of the electric hydraulic tool is made of a one-piece aluminum alloy shell; in addition to hydraulic oil, the internal space of the oil reservoir also contains a plunger assembly (including a plunger pump) and an elastic air bladder designed to avoid vacuum negative pressure; the handle is made of aluminum welded from bent pipe sheet metal.

[0003] Existing integral aluminum alloy materials have complex processing technology and are difficult to process; after-sales maintenance is relatively complicated and the after-sales cost is high. If even one dimension is worn, the whole machine needs to be replaced; the material of the integral oil chamber is mostly aluminum alloy, which is heavy, resulting in a large overall weight, making it inconvenient to carry and work by hand. The oil chamber has limited space to hold oil, making it unsuitable for designing various hydraulic tools that require a large amount of oil. Summary of the Invention

[0004] To address the aforementioned problems, this utility model provides a lightweight electro-hydraulic tool with an external oil bag, comprising a motor housing assembly, a plunger pump assembly, and a cylinder assembly disposed within the motor housing assembly. A drive motor is installed within the motor housing assembly, and the cylinder assembly includes a cylinder and an actuating rod. The plunger pump assembly includes a plunger housing connected to the front end of the motor housing assembly, an eccentric shaft disposed within the plunger housing, and a pump body. The eccentric shaft is connected to the drive motor, and the pump body is fixed to the eccentric shaft near the oil inlet of the cylinder. An oil bag inlet is formed from the outside of the plunger housing inwards, with the inner end of the oil bag inlet communicating with the pump body. An external oil bag is installed on the outside of the plunger housing, with its inlet end connected to the oil bag inlet and communicating with the oil outlet of the cylinder. When the pump body operates, the oil bag inlet facilitates the suction and discharge of oil from the cylinder to the external oil bag.

[0005] According to one embodiment of the present invention, an oil bag pressure plate is fixed to the outside of the plunger housing by fasteners, and an external oil bag is fixed to the plunger housing by the oil bag pressure plate. An oil bag housing is fastened to the outside of the plunger housing.

[0006] According to one embodiment of the present invention, a pressure relief valve is fixed on the outer shell of the oil bag, and the interior of the pressure relief valve is installed in the oil circuit between the oil inlet of the oil bag and the oil cylinder.

[0007] According to one embodiment of the present invention, an outer R-flange portion (851) is formed on the external oil bag (85), and the external oil bag (85) is an elastic oil bag.

[0008] According to one embodiment of the present invention, an oil injection hole is provided from the outside of the plunger housing inward. The inner end of the oil injection hole is connected to the oil passage and oil bag inlet in the pump body, and oil is injected into the plunger housing and the external oil bag through the oil injection hole.

[0009] According to one embodiment of the present invention, an O-ring is provided on the sealing surface between the oil cylinder and the plunger housing to achieve a sealed connection.

[0010] According to one embodiment of the present invention, a plunger cylinder liner is embedded in the inner wall of the plunger housing, and the pump body is housed within the plunger cylinder liner.

[0011] According to one embodiment of the present invention, the lightweight external oil bag electro-hydraulic tool further includes a clamping seat assembly disposed at the front end of the cylinder assembly, wherein a jaw assembly is fixed on the clamping seat assembly and the jaw assembly is connected to the actuating rod of the cylinder assembly.

[0012] According to one embodiment of the present invention, a front handle is fixed on the outer wall of the cylinder assembly, and the two ends of the front handle are bent to both sides and connected to the two side walls of the outer wall of the cylinder assembly.

[0013] A rear handle is also provided on the outer wall of the plunger housing. The rear handle is bent along the length of the plunger housing and is located in the straight line direction of the front handle; or, the rear handle 2 is located at the tail of the motor housing assembly 1.

[0014] The advantages of this utility model compared to the prior art are:

[0015] An external oil bag is installed on the tool's housing, with its inlet connected to the oil bag inlet on the plunger housing and also connected to the oil passage within the pump body. This configuration allows the pump to draw oil from the external oil bag through the inlet and inject it into the cylinder through the inlet at the bottom of the cylinder, pushing the actuator rod forward to complete the mechanical action. Afterward, the oil switch on the actuator rod opens, allowing oil from the rodless chamber of the cylinder to enter the rod chamber and drain through the outlet into the return oil passage. From there, the oil enters the plunger housing and then flows back into the external oil bag through the oil bag inlet on the plunger housing, completing the pressure relief and oil discharge action. The actuator rod then retracts into the cylinder, driving the jaw assembly to complete its reset mechanical action.

[0016] The external oil bag is located on the outside of the plunger housing, thus shortening the overall length of the tool compared to existing tools with large internal oil chambers. The plunger housing is made of plastic, and the external oil bag is soft, making the entire tool lighter. Furthermore, the external oil bag offers good versatility; its capacity can be flexibly increased externally to expand the oil storage capacity, facilitating upgrades and replacements, and meeting the requirements of various tool sizes. Even if the external oil bag is damaged, it can be quickly replaced without disassembling the machine body, reducing the difficulty of repair and improving maintenance efficiency. Attached Figure Description

[0017] Figure 1 A schematic diagram of the assembly structure of a lightweight external oil bag electric hydraulic tool provided for an embodiment of this utility model;

[0018] Figure 2 A longitudinal cross-sectional schematic diagram of a lightweight external oil bag electric hydraulic tool provided for an embodiment of this utility model;

[0019] Figure 3 A schematic diagram of the oil return path of a lightweight, externally mounted oil bag electric hydraulic tool provided for an embodiment of this utility model;

[0020] Figure 4 An exploded view of the plunger housing and oil bag structure assembly of a lightweight external oil bag electro-hydraulic tool provided for an embodiment of this utility model.

[0021] In the diagram: 1. Motor housing assembly; 2. Handle; 3. Hydraulic cylinder assembly; 31. Hydraulic cylinder; 311. Hydraulic cylinder oil outlet; 32. Actuating rod; 4. Front handle; 5. Jaw assembly; 6. Jaw seat assembly; 7. Pressure relief valve; 8. Piston pump assembly; 81. Piston housing; 82. Oil filling hole; 83. Piston cylinder liner; 84. Pump body; 85. Oil bag housing; 86. Oil bag inlet; 87. External oil bag; 871. Outer R-flanged part; 88. Eccentric shaft; 89. Oil bag pressure plate; 810. Fastener; 811. O-ring seal. Detailed Implementation

[0022] The above and other embodiments and advantages of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0023] In one implementation, such as Figures 1-4 As shown:

[0024] This embodiment provides a lightweight external oil bag electro-hydraulic tool, including a motor housing assembly 1, a plunger pump assembly 8 and a cylinder assembly 3 disposed in the motor housing assembly 1. A drive motor is installed inside the motor housing assembly 1, and the cylinder assembly 3 includes a cylinder 31 and an actuating rod 32. The plunger pump assembly 8 includes a plunger housing 81 connected to the front end of the motor housing assembly 1, an eccentric shaft 88 disposed inside the plunger housing 81, and a pump body 84. The eccentric shaft 88 is connected to the drive motor. The pump body 84 is fixed on the eccentric shaft 88 near the oil inlet of the oil cylinder 31. An oil bag inlet 86 is opened from the outside of the plunger housing 81 inward. The inner end of the oil bag inlet 86 communicates with the pump body 84. An external oil bag 87 is installed on the outside of the plunger housing 81. The oil inlet end of the external oil bag 87 is connected to the oil bag inlet 86 and communicates with the oil outlet of the oil cylinder 31. When the pump body 84 is working, the oil cylinder 31 is sucked and discharged to the external oil bag 87 through the oil bag inlet 86.

[0025] During operation, the drive motor inside the motor housing assembly 1 drives the pump body 84 via the eccentric shaft 88. The pump body 84 draws in oil from the external oil bag 87 through the oil bag inlet 86 on the plunger housing 81 and injects it into the oil inlet at the bottom of the cylinder 31 (not shown in the figure due to perspective). The injected oil enters the rodless chamber of the cylinder 31 and drives the actuating rod 32 forward to complete the required mechanical action. Afterward, the oil lubrication switch on the actuating rod 32 opens, and the oil in the rodless chamber of the cylinder 31 enters the rod chamber and is discharged to the return oil circuit (e.g., through the oil outlet 311 on the cylinder 31). Figure 3 As shown by the middle arrow, the oil enters the plunger housing 81 through the return oil passage, and then flows into the external oil bag 87 through the oil bag inlet 86 on the plunger housing 81 to complete the pressure relief and oil discharge action. The action rod 32 retracts back into the cylinder to achieve reset.

[0026] In the lightweight electro-hydraulic tool with an external oil bag provided in this embodiment, the external oil bag 87 is located on the outside of the plunger housing 81. Therefore, compared with existing tools that have a large-sized oil cavity structure inside, the overall length of the tool is shortened. The plunger housing 81 is made of plastic, and the external oil bag 87 is soft, making the entire tool lighter. Moreover, the external oil bag 87 has good versatility; its capacity can be flexibly increased from the outside, increasing the oil storage capacity, facilitating upgrades and replacements, and meeting the requirements for use with tools of various sizes. Furthermore, even if the external oil bag 87 is damaged, it can be quickly replaced without disassembling the machine body, reducing the difficulty of repair and replacement and improving maintenance efficiency.

[0027] like Figure 4As shown, an oil bag pressure plate 89 is fixed to the outside of the plunger housing 81 by fasteners 810. An external oil bag 87 is fixed to the plunger housing 81 by the oil bag pressure plate 89. An oil bag housing 85 is fastened to the outside of the plunger housing 81, and the external oil bag 87 is fastened inside the oil bag housing 85 to form protection. Specifically, the external oil bag 87 has an outer R-shaped flange 871 and is an elastic oil bag. During assembly, the outer R-shaped flange 871 is pressed down by the oil bag pressure plate 89 and then fixed by the fasteners 810. After assembly, the elastic deformation of the external oil bag 87 itself improves the sealing effect.

[0028] Furthermore, such as Figure 3 As shown, a pressure relief valve 7 is fixed on the outer shell 85 of the oil bag. The interior of the pressure relief valve 7 is installed in the oil circuit between the oil inlet 86 of the oil bag and the oil cylinder 31. When the pressure relief valve 7 is moved upward, the oil circuit is completely closed. When the pressure relief valve 7 is moved downward, the oil circuit is opened to release pressure, ensuring the overall safety control of the oil circuit.

[0029] In this embodiment, as Figure 2 As shown, an oil filling hole 82 is formed on the plunger housing 81, extending inward from the outside of the plunger housing 81. The inner end of the oil filling hole 82 communicates with the oil passage and the oil bag inlet 86 inside the pump body 84, allowing oil to be injected into the plunger housing 81 and the external oil bag 87. This arrangement enables the external oil bag 87 to be installed before oil filling, greatly facilitating the installation of the external oil bag.

[0030] Furthermore, such as Figure 2 As shown, an O-ring seal 811 is provided on the sealing surface between the oil cylinder 31 and the plunger housing 81 to achieve a sealed connection. Specifically, fluororubber O-ring seals 811 are used to seal the two sealing surfaces between the oil cylinder 31 and the plunger housing 81 to prevent oil leakage and ensure that the oil in the return oil path of the oil cylinder 31 can enter the pump body 84 during oil return.

[0031] like Figure 4 As shown, the plunger housing 81 is a plastic part, and its inner wall is inlaid with a plunger cylinder liner 83 to improve the strength of the plunger housing 81. The plastic injection-molded plunger housing 81 is not only compact in appearance and lightweight, but also better meets the needs of industry development.

[0032] In this embodiment, the lightweight external oil bag electro-hydraulic tool further includes a clamping seat assembly 6 disposed at the front end of the cylinder assembly 3. A jaw assembly 5 is fixed on the clamping seat assembly 6 and connected to the actuating rod 32 of the cylinder assembly 3 to achieve bending and straightening of the metal part. However, this invention does not impose any limitations on this. In other embodiments, other working head assemblies, such as punching heads, riveting heads, or shearing heads, may also be disposed at the front end of the cylinder assembly.

[0033] like Figure 1As shown, the lightweight external oil bag electro-hydraulic tool includes a front handle 4 and a rear handle 2. The rear handle 2 is fixed to the outer wall of the plunger housing 81, and the front handle 4 is fixed to the outer wall of the cylinder assembly 3. Both ends of the front handle 4 are bent outwards and connected to the outer wall of the cylinder assembly 3. The rear handle 2 is bent along the length of the plunger housing 81 and positioned in the straight line of the front handle 4. During use, both hands grip the front handle 4 and the rear handle 2 respectively, applying force evenly. The device is stable during mechanical operation. Both the front handle 4 and the rear handle 2 are made of plastic, with a plastic handle design for easy carrying and effortless operation. However, this invention does not limit the scope of the invention in any way. In other embodiments, the rear handle may also be located at the tail of the motor housing assembly 1.

[0034] It should be further explained that the oil inlet and return principles mentioned in this invention are existing hydraulic technologies inherent in existing hydraulic tools. The internal structure of the pressure relief valve mentioned in this invention refers to existing handle-type valves, which are mostly used in hydraulic circuits and are also existing technologies. The cylinder operation principle mentioned in this invention is an existing hydraulic drive, with the cylinder having its own oil inlet and outlet, such as a two-position two-way hydraulic cylinder, which is also existing technology. The jaw assembly driven by the cylinder at the front end can be understood as a hydraulic clamp, hydraulic scissors, etc., which are also relatively common mechanical heads. These existing technologies will not be elaborated on in this invention, but are hereby explained.

[0035] The above orientation references do not represent the specific orientations of each component in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme and to make relative descriptions based on the orientations of the references. In reality, the specific orientations of each component are based on their actual installation and use, as well as the orientation descriptions that are customary to those skilled in the art. This is hereby stated.

[0036] The specific embodiments described above further illustrate the utility model's purpose, technical solution, and beneficial effects. It should be understood that the above descriptions are merely specific embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present utility model by those skilled in the art should be included within the scope of protection of the present utility model.

Claims

1. A lightweight electric hydraulic tool with an external oil bag, characterized in that, It includes a motor housing assembly (1) and a plunger pump assembly (8) and a cylinder assembly (3) disposed in the motor housing assembly (1). The motor housing assembly (1) is equipped with a drive motor, and the cylinder assembly (3) includes a cylinder (31) and an actuating rod (32). The plunger pump assembly (8) includes a plunger housing (81) connected to the front end of the motor housing assembly (1), an eccentric shaft (88) disposed within the plunger housing (81), and a pump body (84). The eccentric shaft (88) is connected to a drive motor, and the pump body (84) is fixed on the eccentric shaft (88) near the oil inlet of the oil cylinder (31). An oil bag inlet (86) is provided from the outside of the plunger housing (81) inward. The inner end of the oil bag inlet (86) is connected to the pump body (84). An external oil bag (87) is installed on the outer side of the plunger housing (81). The oil inlet end of the external oil bag (87) is connected to the oil bag inlet (86) and is connected to the oil outlet of the oil cylinder (31). When the pump body (84) is working, the oil inlet (86) of the oil bag is used to complete the oil suction and discharge action from the oil cylinder (31) to the external oil bag (87).

2. The lightweight external oil bag electro-hydraulic tool according to claim 1, characterized in that, An oil bag pressure plate (89) is fixed to the outside of the plunger housing (81) by fasteners (810), and the external oil bag (87) is fixed to the plunger housing (81) by the oil bag pressure plate (89). An oil bag housing (85) is fastened to the outside of the plunger housing (81).

3. The lightweight electric hydraulic tool with an external oil bag according to claim 2, characterized in that, A pressure relief valve (7) is fixed on the outer shell (85) of the oil bag, and the interior of the pressure relief valve (7) is installed in the oil line between the oil bag inlet (86) and the oil cylinder (31).

4. The lightweight electric hydraulic tool with an external oil bag according to claim 2, characterized in that, The external oil bag (87) has an outer R-shaped flange (871) formed on it, and the external oil bag (87) is an elastic oil bag.

5. The lightweight external oil bag electro-hydraulic tool according to claim 1, characterized in that, An oil injection hole (82) is provided from the outside of the plunger housing (81) inward. The inner end of the oil injection hole (82) is connected to the oil passage and oil bag inlet (86) in the pump body (84). Oil is injected into the plunger housing (81) and the external oil bag (87) through the oil injection hole (82).

6. The lightweight external oil bag electro-hydraulic tool according to claim 1, characterized in that, An O-ring seal (811) is provided on the sealing surface between the oil cylinder (31) and the plunger housing (81) to achieve a sealed connection.

7. The lightweight external oil bag electro-hydraulic tool according to claim 1, characterized in that, The inner wall of the plunger housing (81) is inlaid with a plunger cylinder liner (83), and the pump body (84) is housed within the plunger cylinder liner (83).

8. The lightweight external oil bag electro-hydraulic tool according to claim 1, characterized in that, The lightweight external oil bag electro-hydraulic tool also includes a clamp seat assembly (6) disposed at the front end of the cylinder assembly (3), wherein a jaw assembly (5) is fixed on the clamp seat assembly (6) and the jaw assembly (5) is connected to the actuating rod (32) of the cylinder assembly (3).

9. The lightweight external oil bag electro-hydraulic tool according to claim 1, characterized in that, A front handle (4) is fixed on the outer wall of the cylinder assembly (3). The two ends of the front handle (4) are bent to the sides and connected to the two side walls of the outer wall of the cylinder assembly (3).

10. The lightweight external oil bag electro-hydraulic tool according to claim 9, characterized in that, The outer wall of the plunger housing (81) is also provided with a rear handle (2); The rear handle (2) is bent along the length of the plunger housing (81) and positioned in the straight direction of the front handle (4); or, the rear handle (2) is positioned at the tail of the motor housing assembly (1).

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