Automatic sheet metal oil supply device

Abstract

The utility model relates to the technical field of automobile detection, in particular to an automatic sheet metal oil supply device which comprises an oil injection device, an oil suction pump device, a control device and a floating ball switch, the oil injection device comprises an oil injection pipe, the oil injection pipe is communicated with a pressure switch, and the pressure switch is connected with the control device. An oil inlet of the oil injection pipe is connected with an oil outlet of the oil suction pump device, an oil outlet of the oil injection pipe is communicated with the floating ball switch, an oil inlet of the oil suction pump device is communicated with an oil barrel used for containing sheet metal oil through a first pipeline, and the control device is connected with the oil suction pump device to control the oil suction pump device to work. Sheet metal oil is pumped out through the oil suction pump device and injected into the operation basin through the oil injection device, the control device can control the oil suction pump device to work, automation and continuity of the oil supplementing process are achieved, the floating ball switch is further arranged in the detection pool and can be automatically turned on or turned off through the liquid level in the detection pool, and the oil supplementing efficiency is improved. And command control starting and stopping of the sheet metal oil supply process are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile detection, and more specifically to an automatic sheet metal oil replenishing device. Background Art

[0002] During the automotive production process, sheet metal parts are unpainted during the welding process, resulting in a frosted finish that is difficult to visually detect defects. Therefore, sheet metal oil is applied to the surface to create a mirror finish, allowing for visual inspection of defects. Sheet metal inspection oil is typically supplied in barrels. On-site workers must pour the barreled oil into a work basin or siphon it with a hose for use during production. Manual oiling is difficult to control, increasing workload. Furthermore, manual oiling presents the following problems: First, the movement of the oil hose can easily cause oil to spill onto the ground, resulting in waste. Second, the oil basin can easily tip over during handling, posing a safety hazard. Furthermore, multiple oil additions during production, each taking up to 5 minutes, can cause production line downtime and reduce efficiency.

[0003] There is a Chinese utility model with the publication number CN203545657U, which discloses an oiler, comprising: an oil tank with an open structure on the top; a cover body, which detachably covers the oil tank; an oil suction pipe, which is fixed through the cover body, one end of the oil suction pipe is accommodated at the bottom of the oil tank, and the other end of the oil suction pipe is exposed outside the cover body; an oil inlet hole, which is fixed through the cover body, one end of the oil inlet hole is accommodated in the oil tank, and one end of the oil inlet hole is provided with a flip cover; a pump, having a liquid inlet and a liquid outlet, the end of the oil suction pipe exposed outside the cover body being connected to the liquid inlet; an oil filling pipe, one end of which is connected to the liquid outlet of the pump; a control switch, which is electrically connected to the pump for controlling the operation of the pump; an oil mark indicator, which is provided outside the oil tank to indicate the oil level in the oil tank; and a receiving tank, which is connected to the oil tank and can accommodate the oil filling pipe.

[0004] In the above technical solution, the amount of liquid injected can only be observed by the oil gauge, and the amount of oil added cannot be flexibly adjusted according to the liquid level in the working basin, resulting in overfilling or underfilling. It also cannot achieve automatic filling, and manual operation is still required, which cannot ensure that the liquid level in the working basin is at a normal working condition in real time. Utility Model Content

[0005] In order to solve the above-mentioned problem that sheet metal oil cannot be automatically added, the utility model provides an automatic sheet metal oil replenishing device, which realizes the automatic start and stop of the sheet metal oil replenishing process, ensuring that sheet metal oil can be added or stopped in the working pool in time to ensure that the sheet metal oil level in the working pool is at an appropriate level.

[0006] In order to solve the above technical problems, the utility model provides an automatic sheet metal oil replenishing device, including an oil filling device, an oil suction pump device, a control device and a float switch. The oil filling device includes an oil filling pipe, and the oil filling pipe is connected to a pressure switch. The pressure switch is connected to the control device, the oil inlet of the oil filling pipe is connected to the oil outlet of the oil suction pump device, the oil outlet of the oil filling pipe is connected to the float switch, the oil inlet of the oil suction pump device is connected to an oil barrel for holding sheet metal oil through a first pipe, and the control device is connected to the oil suction pump device to control the operation of the oil suction pump device.

[0007] In this technical solution, a float switch is fixed above the working pool. The oil inlet of the suction pump unit is inserted into the oil barrel via a pipe. The suction pump unit creates an air pressure differential to draw sheet metal oil from the barrel into the suction pump unit. The oil is then pressed through the pipe into the oil filling pipe of the oil filling unit. Finally, the sheet metal oil is added to the working pool via the float switch at the oil filling pipe's outlet. A control device controls the operation of the suction pump unit. The float switch is activated and deactivated based on the liquid level in the working pool, ensuring that the liquid level in the working pool is maintained at an appropriate level. Even after the float switch is deactivated, the suction pump unit continues to operate, drawing sheet metal oil from the barrel into the suction pump unit and the oil filling unit, increasing the pressure in both the oil filling unit and the suction pump unit. A pressure switch is connected to the oil filling pipe. When the pressure in the oil filling pipe increases, the pressure switch deactivates. The pressure switch is connected to the control unit. When the pressure switch is deactivated, the control unit controls the suction pump unit to stop operation. When the float switch is turned on, the sheet metal oil in the oil filling pipe is discharged so that the pressure in the oil filling pipe returns to normal, the pressure switch is turned on, and the control device controls the oil suction pump device to resume normal operation.

[0008] Preferably, the oil suction pump device includes an oil suction cylinder and a driving member, a first oil port is provided on the cylinder body of the oil suction cylinder, the first oil port is connected to the oil barrel through a first pipe, the first oil port is also connected to a second pipe, the second pipe is connected to the oil inlet of the oil filling pipe, a first one-way valve is provided on the first pipe, a piston is installed in the oil suction cylinder, the piston is connected to a piston rod extending out of the oil suction cylinder, the piston rod is connected to a connecting rod, the driving member is connected to the connecting rod for driving the piston to reciprocate in the oil suction cylinder, and the driving member is connected to the control device.

[0009] Preferably, a second one-way valve is also provided on the second pipeline, and the second pipeline is connected to the first pipeline, and the connection point between the second pipeline and the first pipeline is located on the side of the first one-way valve away from the oil barrel.

[0010] Preferably, the oil suction cylinder is further provided with a second oil port, and the second oil port is connected to the oil barrel through a third pipe.

[0011] Preferably, two driving members are provided, and the two driving members are respectively installed on both sides of the oil suction cylinder.

[0012] Preferably, the driving member is a cylinder, and a first air port and a second air port are provided on the driving member. The control device includes a reversing valve, and the external air source is connected to the pressure switch through a fourth pipe. The reversing valve has an air inlet end, a first air outlet end and a second air outlet end. The pressure switch is connected to the air inlet end of the reversing valve through a fifth pipe, and the first air outlet end of the reversing valve is connected to the first air port through a sixth pipe, and the second air outlet end of the reversing valve is connected to the second air port through a seventh pipe.

[0013] Preferably, the control device further includes a first travel switch and a second travel switch, the first travel switch and the second travel switch are respectively arranged on both sides of the connecting rod, and the first travel switch and the second travel switch are connected to the reversing valve.

[0014] Preferably, the first travel switch and the second travel switch are pneumatic switches, and the first travel switch and the second travel switch are respectively provided with an air inlet and an air outlet, and the first control air port and the second control air port are provided at both ends of the reversing valve, the air inlets of the first travel switch and the second travel switch are connected to the fifth pipe, the air outlet of the first travel switch is connected to the first control air port through the ninth pipe, and the air outlet of the second travel switch is connected to the second control air port through the tenth pipe.

[0015] Preferably, a pressure storage tank is further provided at the oil outlet of the oil filling pipe.

[0016] Preferably, the oil filling pipe is also connected to a pressure gauge.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: an oil suction pump device is provided to extract sheet metal oil and inject it into the working basin through the oil injection device; the control device can control the operation of the oil suction pump device, thereby realizing the automation and continuity of the oil replenishment process; a float switch is also provided in the detection pool, which can be automatically opened or closed by detecting the liquid level in the pool, thereby realizing the automatic start and stop of the sheet metal oil replenishment process, ensuring that sheet metal oil can be added or stopped to the working pool in a timely manner to ensure that the sheet metal oil level in the working pool is at an appropriate level. A pressure switch is provided on the oil injection pipe, which can cause the control device to start or pause the operation of the oil suction pump device according to the pressure in the oil injection pipe, thereby avoiding the occurrence of excessive pressure in the oil injection pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional diagram of the automatic sheet metal oil supply device of the utility model without the pipelines;

[0019] Figure 2 This is a three-dimensional diagram of the automatic sheet metal oil supply device of the utility model after removing the pipes and the float switch;

[0020] Figure 3 It is a structural schematic diagram of the automatic sheet metal oil replenishing device of the present utility model.

[0021] In the accompanying drawings: 1. Oil filling device; 2. Oil suction pump device; 3. Control device; 4. Float switch; 5. First pipeline; 6. Oil drum; 7. Second pipeline; 8. Third pipeline; 11. Oil filling pipe; 12. Pressure switch; 13. Pressure storage tank; 14. Pressure gauge; 21. Oil suction cylinder; 22. Driving member; 23. Connecting rod; 24. First oil port; 25. First one-way valve; 26. Second one-way valve; 27. Second oil port; 28. First air port; 29. ​​Second air port; 31. Reversing valve; 32. First travel switch; 33. Second travel switch; 34. Fourth pipeline; 35. Fifth pipeline; 36. Sixth pipeline; 37. Seventh pipeline; 38. Eighth pipeline; 39. Ninth pipeline; 310. Tenth pipeline; 311. First control air port; 312. Second control air port. DETAILED DESCRIPTION

[0022] The drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate the embodiments, some components in the drawings may be omitted, enlarged, or reduced in size, and do not represent actual product dimensions. Those skilled in the art will understand that some well-known structures and their descriptions may be omitted from the drawings. The positional relationships depicted in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0023] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0025] Example 1

[0026] like Figure 1 、 3As shown, an automatic sheet metal oil replenishing device includes an oil filling device 1, an oil suction pump device 2, a control device 3 and a float switch 4. The oil filling device 1 includes an oil filling pipe 11, and the oil filling pipe 11 is connected to a pressure switch 12. The pressure switch 12 is connected to the control device 3. The oil inlet of the oil filling pipe 11 is connected to the oil outlet of the oil suction pump device 2, and the oil outlet of the oil filling pipe 11 is connected to the float switch 4. The oil inlet of the oil suction pump device 2 is connected to the oil barrel 6 for containing sheet metal oil through a first pipe 5. The control device 3 is connected to the oil suction pump device 2 to control the operation of the oil suction pump device 2. The float switch 4 is fixed above the working pool, wherein the float in the float switch 4 floats on the liquid surface in the working pool. The oil inlet of the oil suction pump device 2 is inserted into the oil barrel 6 through a pipe. The oil suction pump device 2 draws the sheet metal oil in the oil barrel 6 into the oil suction pump device 2 by creating an air pressure difference. The sheet metal oil in the oil suction pump device 2 is then pressed into the oil filling pipe 11 in the oil filling device 1 through a pipe. Finally, the sheet metal oil is added to the working pool through the float switch 4 at the oil outlet of the oil filling device 1. The control device 3 is used to control the operation of the oil suction pump device 2. The float switch 4 includes a switch portion and a floating portion. The switch portion is fixed above the working pool, and the float portion floats in the liquid surface of the working pool. When the operator performs sheet metal surface inspection, the sheet metal oil is continuously taken from the working pool, causing the liquid level in the working pool to continuously change, thereby causing the relative position of the float portion and the switch portion to change. When the liquid level drops, the float moves away from the switch. When it moves away to a certain distance, the float switch 4 will open, and sheet metal oil can be added into the working pool through the float switch 4, thereby causing the liquid level in the working pool to rise. The rising liquid level drives the float to move toward the switch. When the float rises to a certain position, the float switch 4 will close, and sheet metal oil will no longer be added to the working pool. This realizes automatic filling and stopping of sheet metal liquid according to the liquid level in the working pool, ensuring that the liquid level in the working pool can be maintained at an appropriate level. After the float switch 4 is closed, the oil suction pump device 2 is still working, sucking the sheet metal oil in the oil barrel 6 into the oil suction pump device 2 and the oil injection device 1, and the pressure in the oil injection device 1 and the oil suction pump device 2 will increase. The oil filling pipe 11 is connected to a pressure switch 12. When the pressure in the oil filling pipe 11 increases, the pressure switch 12 will be closed. The pressure switch 12 is connected to the control device 3. After the pressure switch 12 is closed, the control device 3 controls the oil suction pump device 2 to stop. When the float switch 4 opens, the sheet metal oil in the oil filling pipe 11 is discharged, and the pressure in the oil filling pipe 11 returns to normal. The pressure switch 12 opens, and the control device 3 controls the oil suction pump device 2 to resume normal operation.

[0027] like Figure 1 、 3As shown, the oil suction pump device 1 includes an oil suction cylinder 21 and a driving member 22. A first oil port 24 is provided on the cylinder body of the oil suction cylinder 21. The first oil port 24 is connected to the oil barrel 6 through the first pipe 5. The first oil port 24 is also connected to the second pipe 7. The second pipe 7 is connected to the oil inlet of the oil filling pipe 11. A first one-way valve 25 is provided on the first pipe 5. A piston is installed in the oil suction cylinder 21. The piston is connected to a piston rod extending out of the oil suction cylinder 21. The piston rod is connected to a connecting rod 23. The driving member 22 is connected to the connecting rod 23 to drive the piston to reciprocate in the oil suction cylinder 21. The driving member 22 is connected to the control device 3. The cylinder body of the oil suction cylinder 21 is divided into a first space and a second space by the piston. The first space is connected to the first oil port 24 and is filled with sheet metal oil. When the piston moves, the first space expands and the second space shrinks. While the amount of sheet metal oil in the first space remains unchanged, the pressure in the first space decreases, making the pressure in the first space less than the external atmospheric pressure. Since the oil barrel 6 is connected to the outside atmosphere, the sheet metal oil in the oil barrel 6 is pressed into the oil suction cylinder 21 under the action of atmospheric pressure. The piston then moves in the opposite direction, compressing the volume of the first space and pushing the sheet metal oil in the first space out of the first oil port 24. The sheet metal oil is then pushed into the oil filling pipe 11 through the second pipe 7 and ultimately injected into the working pool. During this process, the sheet metal oil may be forced back into the oil barrel 6 through the first pipe 5. Therefore, a first one-way valve 25 is provided on the first pipe 5 to ensure that the sheet metal oil can only flow from the oil barrel 6 into the oil suction cylinder 21. The driving end of the driver 22 is connected to the piston rod of the oil suction cylinder 21 via a connecting rod 23. The driver 23 provides power for the oil suction cylinder 21 to siphon or press out the sheet metal oil by driving the piston rod. The driving member 22 is connected to the control device 3. The control device 3 can control the driving member 22 to reciprocate and extend to control the oil suction cylinder 21 to continuously siphon and press out the sheet metal oil.

[0028] like Figure 1 、 3 As shown, the second pipe 7 is also provided with a second one-way valve 6. The second pipe 7 is connected to the first pipe 5 at a point on the side of the first one-way valve 25 away from the oil barrel 6. When the suction cylinder 21 draws in sheet metal oil, the second pipe 7 is also affected by the siphon effect of the suction cylinder 21, potentially causing the sheet metal oil already pressed into the oil filling pipe 11 to be sucked back into the suction cylinder 21, affecting the oil filling effect. Therefore, the second pipe 7 is also provided with a second one-way valve 6. The second one-way valve 6 restricts the flow of sheet metal oil from the suction cylinder 21 to the oil filling pipe 11, preventing backflow. The second pipe 7 is connected to the first pipe 5 at a point on the side of the first one-way valve 25 away from the oil barrel 6. This prevents the suction cylinder 21 from pressing sheet metal oil into the second pipe 7 through the first one-way valve 25, ensuring that the first one-way valve 25 does not affect the normal operation of the second pipe 7.

[0029] like Figure 2 、 3 As shown, the oil suction cylinder 21 is further provided with a second oil port 27, which is connected to the oil barrel 6 via a third pipe 8. The second oil port 27 is connected to the second space in the oil suction cylinder 21. The second space is filled with sheet metal oil to balance the pressure on both sides of the piston. The second oil port 27 is connected to the oil barrel 6 via the third pipe 8, so that the second space can absorb sheet metal oil from the oil barrel 6 or press sheet metal oil into the oil barrel 6.

[0030] like Figure 2 As shown, two drive members 22 are provided, one mounted on each side of the oil suction cylinder 21. To ensure the piston's tightness, it is essential that the piston can move along the length of the oil suction cylinder 21. A single drive member 22 can only move one side, driving the piston rod and, in turn, the piston. This could cause the piston to tilt due to uneven force, affecting the seal within the oil suction cylinder 21. Therefore, two drive members 22 are provided, one mounted on each side of the oil suction cylinder 21, to ensure that the piston is evenly stressed and does not tilt.

[0031] Example 2

[0032] This embodiment is similar to the first embodiment described above, except that the driving member 22 is a cylinder, provided with a first air port 28 and a second air port 29. The control device 3 includes a reversing valve 31. An external air source is connected to the pressure switch 12 via a fourth conduit 34. The reversing valve 31 has an inlet, a first air outlet, and a second air outlet. The pressure switch 12 is connected to the inlet of the reversing valve 31 via a fifth conduit 35. The first air outlet of the reversing valve 31 is connected to the first air port 28 via a sixth conduit 36, and the second air outlet of the reversing valve 31 is connected to the second air port 29 via a seventh conduit 37. By alternating the ventilation and degassing of the first and second air ports 28, 29 on the driving member 22, the driving end of the driving member 22 can be extended and retracted, thereby driving the oil suction cylinder 21 to siphon and expel sheet metal oil. The reversing valve 31 can change the inflated and deflated state of the first and second air ports 28, 29 by changing the position of the valve core. The reversing valve 31 is provided with an air inlet, a first air outlet, and a second air outlet. The pressure switch 12 is connected to the air inlet of the reversing valve 31 via a fifth pipe 35. The first air outlet is connected to the first air port 28 via a sixth pipe 36. The second air outlet is connected to the second air port 29 via a seventh pipe 37. An external air source continuously delivers gas to the air inlet of the reversing valve 31 through the fifth pipe 35. When the valve core of the reversing valve 31 moves to the first position, the air inlet is connected to the first air outlet, and the external air source inputs gas into the first air port 28. At this time, the second air port 29 is in a deflated state. When the valve core of the reversing valve 31 moves to the second position, the air inlet is connected to the second air outlet, and the external air source inputs gas into the second air port 29. At this time, the first air port 28 is in a deflated state.

[0033] like Figure 1 、 2 As shown, the control device 3 also includes a first travel switch 32 and a second travel switch 33, respectively disposed on either side of the connecting rod 23. The first and second travel switches 32, 33 are connected to the reversing valve 31. The position of the connecting rod 23 is synchronized with the position of the piston rod in the oil suction cylinder 21. Therefore, the operating status of the oil suction cylinder 21 can be determined by the position of the connecting rod 23. When the oil suction cylinder 21 reaches maximum siphoning, the connecting rod 23 contacts the first travel switch 32. The first travel switch 23 controls the movement of the valve core of the reversing valve 31, thereby changing the direction of movement of the piston in the oil suction cylinder 21, causing the piston to squeeze the sheet metal oil in the oil suction cylinder 21 into the oil filling pipe 11. When the oil suction cylinder 21 reaches maximum oil discharge, the connecting rod 23 contacts the second travel switch 33. The second travel switch 33 controls the movement of the valve core of the reversing valve 31, thereby changing the direction of movement of the piston in the oil suction cylinder 21, causing the sheet metal oil in the oil barrel 6 to be drawn into the oil suction cylinder 21.

[0034] like Figure 2 、 3 As shown, the first and second travel switches 32, 33 are pneumatic switches, each provided with an air inlet and an air outlet. A first control air port 311 and a second control air port 312 are provided at both ends of the reversing valve 31. The air inlets of the first and second travel switches 32, 33 are connected to the fifth pipe 35, while the air outlet of the first travel switch 32 is connected to the first control air port 311 via the ninth pipe 39. The air outlet of the second travel switch 33 is connected to the second control air port 312 via the tenth pipe 310. Under normal circumstances, the air passages in the first and second travel switches 32, 33 are closed. When the connecting rod 23 contacts the first travel switch 32, the air passage in the first travel switch 32 opens, the air inlet of the first travel switch 32 communicates with the fifth pipe 35, and the fifth pipe 35 injects gas into the air inlet of the first travel switch 32. The gas is then injected into the first control air port 311 through the ninth pipe 39, pushing the valve core in the reversing valve 31 to the first position. When the connecting rod 23 contacts the second travel switch 33, the air passage in the second travel switch 33 opens, the air inlet of the second travel switch 33 communicates with the fifth pipe 35, and the fifth pipe 35 injects gas into the air inlet of the second travel switch 33. The gas is then injected into the second control air port 312 through the tenth pipe 310, pushing the valve core in the reversing valve 31 to the second position.

[0035] when

[0036] Example 3

[0037] This embodiment is similar to the above embodiment 1, except that Figure 2 、3 As shown, a pressure storage tank 13 is further provided at the oil outlet of the oil filling pipe 11. The pressure storage tank 13 is used to store excess sheet metal oil in the oil filling pipe 11 to prevent the pressure in the oil filling pipe 11 from being too high.

[0038] like Figure 2 、 3 As shown, the oil filling pipe 11 is also connected with a pressure gauge 14. The pressure gauge 14 is convenient for detecting the pressure in the oil filling pipe 11 when in use to avoid accidents.

[0039] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An automatic sheet metal oil supply device, characterized in that: The invention comprises an oil injection device (1), an oil suction pump device (2), a control device (3) and a float switch (4); the oil injection device (1) comprises an oil injection pipe (11); the oil injection pipe (11) is connected to a pressure switch (12); the pressure switch (12) is connected to the control device (3); the oil inlet of the oil injection pipe (11) is connected to the oil outlet of the oil suction pump device (2); the oil outlet of the oil injection pipe (11) is connected to the float switch (4); the oil inlet of the oil suction pump device (2) is connected to an oil barrel (6) for containing sheet metal oil through a first pipe (5); the control device (3) is connected to the oil suction pump device (2) to control the operation of the oil suction pump device (2).

2. The automatic sheet metal oil replenishing device according to claim 1, characterized in that: The oil suction pump device (2) comprises an oil suction cylinder (21) and a driving member (22). A first oil port (24) is provided on the cylinder body of the oil suction cylinder (21). The first oil port (24) is connected to the oil barrel (6) through a first pipe (5). The first oil port (24) is also connected to a second pipe (7). The second pipe (7) is connected to the oil inlet of the oil filling pipe (11). A first one-way valve (25) is provided on the first pipe (5). A piston is installed in the oil suction cylinder (21). The piston is connected to a piston rod extending out of the oil suction cylinder (21). The piston rod is connected to a connecting rod (23). The driving member (22) is connected to the connecting rod (23) for driving the piston to reciprocate in the oil suction cylinder (21). The driving member (22) is connected to the control device (3).

3. The automatic sheet metal oil replenishing device according to claim 2, characterized in that: A second one-way valve (26) is also provided on the second pipeline (7). The second pipeline (7) is connected to the first pipeline (5). The connection point between the second pipeline (7) and the first pipeline (5) is located on the side of the first one-way valve (25) away from the oil barrel (6).

4. The automatic sheet metal oil replenishing device according to claim 2, characterized in that: The oil suction cylinder (21) is also provided with a second oil port (27), and the second oil port (27) is connected to the oil barrel (6) through a third pipe (8).

5. The automatic sheet metal oil replenishing device according to claim 2, characterized in that: Two driving members (22) are provided, and the two driving members (22) are respectively installed on both sides of the oil suction cylinder (21).

6. The automatic sheet metal oil replenishing device according to claim 2, characterized in that: The driving member (22) is a cylinder. A first air port (28) and a second air port (29) are provided on the driving member (22). The control device (3) includes a reversing valve (31). An external air source is connected to the pressure switch (12) through a fourth pipe (34). The reversing valve (31) has an air inlet end, a first air outlet end, and a second air outlet end. The pressure switch (12) is connected to the air inlet end of the reversing valve (31) through a fifth pipe (35). The first air outlet end of the reversing valve (31) is connected to the first air port (28) through a sixth pipe (36). The second air outlet end of the reversing valve (31) is connected to the second air port (29) through a seventh pipe (37).

7. The automatic sheet metal oil replenishing device according to claim 6, characterized in that: The control device (3) further comprises a first travel switch (32) and a second travel switch (33), wherein the first travel switch (32) and the second travel switch (33) are respectively arranged on both sides of the connecting rod (23), and the first travel switch (32) and the second travel switch (33) are connected to the reversing valve (31).

8. The automatic sheet metal oil replenishing device according to claim 7, characterized in that: The first travel switch (32) and the second travel switch (33) are pneumatic switches. The first travel switch (32) and the second travel switch (33) are respectively provided with an air inlet and an air outlet. The first control air port (311) and the second control air port (312) are provided at both ends of the reversing valve (31). The air inlets of the first travel switch (32) and the second travel switch (33) are connected to the fifth pipe (35). The air outlet of the first travel switch (32) is connected to the first control air port (311) through a ninth pipe (39). The air outlet of the second travel switch (33) is connected to the second control air port (312) through a tenth pipe (310).

9. The automatic sheet metal oil replenishing device according to claim 1, characterized in that: A pressure storage tank (13) is also provided at the oil outlet of the oil filling pipe (11).

10. The automatic sheet metal oil replenishing device according to claim 1, characterized in that: The oil injection pipe (11) is also connected to a pressure gauge (14).

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