Electric hydraulic tool capable of manually returning oil

Abstract

The utility model discloses an electric hydraulic tool capable of manually returning oil, which comprises a valve body provided with an oil inlet channel and an oil return channel, an oil bag connected with the oil inlet ends of the oil inlet channel and the oil return channel is arranged at the bottom of the valve body, an oil cylinder used for being connected with and driving a working head is arranged at the end of the valve body, and an oil cavity is formed in the oil cylinder. An auxiliary oil return channel is further formed in the valve body, one end of the auxiliary oil return channel is communicated with the oil cavity, the other end of the auxiliary oil return channel is communicated with the oil bag, an installation hole communicated with the auxiliary oil return channel is formed in the outer side of the valve body, and a manual oil return bolt is installed in the installation hole in a threaded mode. An oil return steel ball used for blocking the auxiliary oil return channel is arranged at the end of the manual oil return bolt. According to the electric hydraulic tool, the auxiliary oil return channel is arranged, so that oil can be manually returned through the auxiliary oil return channel when the oil return channel is blocked, the hydraulic tool does not need to be maintained by shutdown, and the production efficiency cannot be influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic tools, and more particularly to an electric hydraulic tool capable of manually returning oil. Background Art

[0002] At present, with the development of social economy, the use of hydraulic pliers and hydraulic shears in production and life is becoming more and more common. Among them, hydraulic shears have the advantages of high shearing force and easy operation. In the event of fire, traffic accident, or earthquake disaster, they are used to cut through metal or non-metallic structures, such as steel guardrails, door frames, cables, and car frames. They can quickly rescue victims trapped in confined environments or rescue victims in dangerous environments. Therefore, they have become an essential demolition tool for firefighters, traffic police, industrial and mining enterprises, and other rescue departments. Hydraulic pliers use hydraulic pumps to achieve the clamping of the actuator head. Hydraulic pliers are often used in the construction of power transmission and distribution lines. For example, hydraulic pliers are used to crimp copper terminals in cable construction, crimp double-split lead fittings for equipment terminal blocks in substations, and crimp wire clamps at high altitudes for terminal equipment on transmission and distribution lines.

[0003] Existing electric hydraulic tools are generally provided with an oil inlet channel and an oil return channel. The oil inlet channel is used to transport oil to provide hydraulic pressure so that the working head can work, and the oil return channel is used to transport the oil back, so that the working head can be depressurized and reset. However, during the crimping operation, the oil return channel may be blocked, resulting in the working head being unable to reset. This will require stopping work to repair the hydraulic tool, which will greatly affect production efficiency. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the purpose of the utility model is to provide an electric hydraulic tool with manual oil return. By providing an auxiliary oil return channel, the oil can be manually returned through the auxiliary oil return channel when the oil return channel is blocked. There is no need to stop work to repair the hydraulic tool, which will not affect production efficiency.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an electric hydraulic tool with manual oil return, comprising a valve body with an oil inlet channel and an oil return channel, an oil bag connected to the oil inlet channel and the oil return channel at the bottom of the valve body, an oil cylinder for connecting and driving a working head is provided at the end of the valve body, an oil cavity is formed in the oil cylinder, and an auxiliary oil return channel is also provided inside the valve body, one end of the auxiliary oil return channel is connected to the oil cavity, and the other end is connected to the oil bag, a mounting hole connected to the auxiliary oil return channel is provided on the outside of the valve body, a manual oil return bolt is threadedly installed in the mounting hole, and an oil return steel ball is provided at the end of the manual oil return bolt for blocking the auxiliary oil return channel.

[0006] The utility model is further configured as follows: the auxiliary oil return channel includes a first oil channel located at the center of the oil cylinder and connected to the oil chamber, a second oil channel coaxially connected to the mounting hole, and a third oil channel extending vertically downward to the oil bag. The diameter of the mounting hole is larger than the diameter of the second oil channel. The oil return steel ball is located in the mounting hole and is pressed against the third oil channel through a manual oil return bolt to play a blocking role. The third oil channel is located on the inner wall of the mounting hole.

[0007] The utility model is further configured as follows: the oil outlet hole of the third oil channel close to one end of the mounting hole is configured in a bell-mouth shape.

[0008] The utility model is further configured to include a handle arranged at one end of the valve body away from the oil cylinder, wherein the handle has a built-in power source.

[0009] The utility model is further configured as follows: a first rubber sealing ring is provided between the manual oil return bolt and the mounting hole.

[0010] The utility model is further configured as follows: an oil passage connected to the first oil passage is provided at the center of the oil cavity, and a second rubber sealing ring is provided between the oil passage and the first oil passage.

[0011] The present invention is further configured such that the diameters of the first oil passage, the second oil passage and the third oil passage are the same.

[0012] By adopting the above technical solution, this practical electric hydraulic tool is provided with an auxiliary oil return channel, so that when the oil return channel is blocked, manual oil return can be performed through the auxiliary oil return channel, without stopping the hydraulic tool for maintenance, and will not affect production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 is a cross-sectional view of the valve body;

[0015] Figure 3 for Figure 2 Enlarged view of point a in the middle;

[0016] Figure 4 Schematic diagram of the valve body structure.

[0017] 1. Valve body; 10. Oil inlet channel; 11. Oil return channel; 12. Mounting hole; 13. Working head; 2. Oil bag; 3. Oil cylinder; 30. Oil chamber; 31. Oil passage; 4. Auxiliary oil return channel; 40. First oil channel; 41. Second oil channel; 42. Third oil channel; 5. Manual oil return bolt; 6. Oil return steel ball; 7. Handle; 8. First rubber sealing ring; 9. Second rubber sealing ring. DETAILED DESCRIPTION

[0018] Reference Figures 1 to 4 The embodiments of the present invention are further described.

[0019] The utility model discloses an electric hydraulic tool with manual oil return, comprising a valve body 1 having an oil inlet passage 10 and an oil return passage 11. An oil bag 2 connected to the oil inlet ends of the oil inlet passage 10 and the oil return passage 11 is provided at the bottom of the valve body 1. A cylinder 3 for connecting to and driving a working head 13 is provided at the end of the valve body 1. The cylinder 3 has an oil chamber 30 formed therein. A secondary oil return passage 4 is also defined within the valve body 1. One end of the secondary oil return passage 4 is connected to the oil chamber 30 and the other end is connected to the oil bag 2. A mounting hole 12 connected to the secondary oil return passage 4 is defined on the outside of the valve body 1. A manual oil return bolt 5 is threadedly mounted within the mounting hole 12. An oil return steel ball 6 is provided at the end of the manual oil return bolt 5 for blocking the secondary oil return passage 4. The utility model also includes a handle 7 disposed at the end of the valve body 1 away from the cylinder 3, wherein the handle 7 has a built-in power source.

[0020] Further, such as Figure 2 As shown, the auxiliary oil return channel 4 includes a first oil channel 40 located at the center of the oil cylinder 3 and connected to the oil chamber 30, a second oil channel 41 coaxially connected to the mounting hole 12, and a third oil channel 42 extending vertically downward to the oil bag 2. The diameter of the mounting hole 12 is larger than the diameter of the second oil channel 41. The oil return steel ball 6 is located in the mounting hole 12 and abuts against the third oil channel 42 through the manual oil return bolt 5 to block the third oil channel 42. The third oil channel 42 is located on the inner wall of the mounting hole 12.

[0021] Further, such as Figure 3 As shown, the oil outlet of the third oil passage 42 is arranged in a bell-mouth shape near one end of the mounting hole 12. By arranging the oil outlet of the third oil passage 42 in a bell-mouth shape, the oil return steel ball 6 can better adapt to block the third oil passage 42, and the sealing performance is better when manual oil return is not required.

[0022] Furthermore, the diameters of the first oil passage 40, the second oil passage 41 and the third oil passage 42 are set to be the same. By setting the diameters of the first oil passage 40, the second oil passage 41 and the third oil passage 42 to be the same, the oil flows more smoothly in the auxiliary oil return passage 4.

[0023] Furthermore, a first rubber seal 8 is provided between the manual oil return bolt 5 and the mounting hole 12. An oil passage 31 connected to the first oil passage 40 is provided at the center of the oil chamber 30, and a second rubber seal 9 is provided between the oil passage 31 and the first oil passage 40. The provision of the first and second rubber seals 8 and 9 improves the sealing performance within the valve body 1, preventing oil leakage and extending the service life of the valve body 1.

[0024] Working principle: When the oil return channel 11 is blocked and the working head 13 cannot be reset during operation, the manual oil return bolt 5 can be loosened by screwing it so that the manual oil return bolt 5 can be released from the limit of the oil return steel ball 6. Figure 3 As shown, the oil in the oil chamber 30 will enter the second oil channel 41 through the first oil channel 40. When the oil return steel ball 6 loses its limit, the oil in the second oil channel 41 will give pressure to the oil return steel ball 6 to push it toward the outside of the mounting hole 12.

[0025] When the manual oil return bolt 5 is screwed to a certain position, the oil return steel ball 6 will be pushed to the rear of the third oil channel 42 by the oil. At this time, the oil in the second oil channel 41 will flow back into the oil bag 2 through the third oil channel 42 on the inner wall of the mounting hole 12. In this way, the effect of manual oil return can be achieved. The working head 13 can quickly reset when it loses the oil pressure. After the working head is reset, the manual oil return bolt 5 can be screwed back to its original position, so that the oil return steel ball 6 will press against the second oil channel 41 to block it. At this time, the oil inlet channel 10 can still be used to supply oil to provide hydraulic pressure to keep the working head 13 working, and then the auxiliary oil return channel 4 can be used for manual oil return.

[0026] The practical electric hydraulic tool is provided with an auxiliary oil return channel 4, so that when the return oil channel 11 is blocked, the oil can be manually returned through the auxiliary oil return channel 4, without stopping the hydraulic tool for maintenance, and will not affect the production efficiency.

[0027] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An electric hydraulic tool with manual oil return, characterized by: The invention comprises a valve body (1) having an oil inlet channel (10) and an oil return channel (11); an oil bag (2) connected to the oil inlet ends of the oil inlet channel (10) and the oil return channel (11) is provided at the bottom of the valve body (1); an oil cylinder (3) for connecting and driving a working head is provided at the end of the valve body (1); an oil cavity (30) is formed in the oil cylinder (3); an auxiliary oil return channel (4) is also provided inside the valve body (1); one end of the auxiliary oil return channel (4) is connected to the oil cavity (30), and the other end is connected to the oil bag (2); a mounting hole (12) connected to the auxiliary oil return channel (4) is provided on the outside of the valve body (1); a manual oil return bolt (5) is installed in the inner thread of the mounting hole (12); and an oil return steel ball (6) for blocking the auxiliary oil return channel (4) is provided at the end of the manual oil return bolt (5).

2. The electric hydraulic tool with manual oil return according to claim 1, characterized in that: The auxiliary oil return passage (4) comprises a first oil passage (40) located at the center of the oil cylinder (3) and connected to the oil chamber (30), a second oil passage (41) coaxially connected to the mounting hole (12), and a third oil passage (42) extending downward vertically to the oil bag (2); the diameter of the mounting hole (12) is larger than the diameter of the second oil passage (41); the oil return steel ball (6) is located in the mounting hole (12) and abuts against the third oil passage (42) through the manual oil return bolt (5) to play a blocking role; the third oil passage (42) is located on the inner wall of the mounting hole (12).

3. The electric hydraulic tool with manual oil return according to claim 2, characterized in that: The oil outlet hole of the third oil passage (42) close to one end of the mounting hole (12) is arranged in a bell-mouth shape.

4. The electric hydraulic tool with manual oil return according to claim 1, characterized in that: It also includes a handle (7) arranged at one end of the valve body (1) away from the oil cylinder (3), and the handle (7) has a built-in power source.

5. The electric hydraulic tool with manual oil return according to claim 1, characterized in that: A first rubber sealing ring (8) is provided between the manual oil return bolt (5) and the mounting hole (12).

6. The electric hydraulic tool with manual oil return according to claim 2, characterized in that: An oil passage (31) connected to the first oil passage (40) is provided at the center of the oil chamber (30), and a second rubber sealing ring (9) is provided between the oil passage (31) and the first oil passage (40).

7. The electric hydraulic tool with manual oil return according to claim 2, characterized in that: The diameters of the first oil passage (40), the second oil passage (41) and the third oil passage (42) are arranged to be the same.

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