Needle cleaning mechanism for oil dispensing gun

Abstract

The utility model provides an oil dispensing gun needle head cleaning mechanism which comprises a cleaning seat and an oil collecting groove arranged below the cleaning seat, an air inlet channel, a negative pressure channel and an air blowing cavity are arranged in the cleaning seat, the negative pressure channel is arranged right above the air blowing cavity, the upper end of the negative pressure channel is communicated with the atmosphere, and the lower end of the negative pressure channel is communicated with the air blowing cavity. The negative pressure channel and the blowing cavity vertically penetrate through the cleaning seat; the oil collecting groove is positioned below the air blowing cavity and is communicated with the air blowing cavity; the air inlet channel communicates with the air blowing cavity and is used for conveying high-pressure air into the air blowing cavity, so that negative pressure is formed in the negative pressure channel; the lower end of the needle head can be inserted into the negative pressure channel and the air blowing cavity. The cleaning mechanism for the needle head of the oil dispensing gun can improve the cleaning efficiency of the needle head, can perform non-contact cleaning on the needle head, does not influence the position precision of the needle head, and is beneficial to improving the product quality.

Description

Technical Field

[0001] This utility model relates to the field of automated cleaning equipment technology, and in particular to a cleaning mechanism for an oil gun needle. Background Technology

[0002] In automated production and product assembly, many products require the use of an oiling gun to apply oil (usually lubricating oil) to lubricate them. For some high-precision products, the accuracy of the oil application is extremely important. However, some residual oil inevitably remains at the tip of the oiling gun during application. Therefore, the needle needs to be cleaned between each application to remove residual oil and ensure the accuracy of the next application.

[0003] The current common practice is to wipe the needle tip with a cleaning cotton pad to remove residual oil. The disadvantages of this method are: it requires frequent replacement of the cleaning cotton pad and has low cleaning efficiency; furthermore, wiping the needle tip can affect its positioning accuracy, causing misalignment of the oil application and impacting product quality. Utility Model Content

[0004] The purpose of this invention is to provide a needle cleaning mechanism for oil dispensing guns, which not only improves the cleaning efficiency of the needles but also enables non-contact cleaning without affecting the positional accuracy of the needles, thus improving product quality.

[0005] This utility model provides a nozzle cleaning mechanism for cleaning residual oil from the nozzle tip. The nozzle cleaning mechanism includes a cleaning seat and an oil collection groove located below the cleaning seat. The cleaning seat has an air inlet channel, a negative pressure channel, and an air blowing chamber. The negative pressure channel is located directly above the air blowing chamber, with its upper end connected to the atmosphere and its lower end connected to the air blowing chamber. The negative pressure channel and the air blowing chamber extend vertically through the cleaning seat. The oil collection groove is located below the air blowing chamber and is connected to it. The air inlet channel is connected to the air blowing chamber and is used to deliver high-pressure gas into the air blowing chamber to create a negative pressure in the negative pressure channel. The lower end of the nozzle tip can be inserted into both the negative pressure channel and the air blowing chamber.

[0006] In one possible implementation, the air intake channel includes a first air passage that is inclined relative to the vertical direction, the lower end of the first air passage being inclined relative to its upper end toward the side close to the air blowing chamber, and the lower end of the first air passage being directly connected to the air blowing chamber.

[0007] In one feasible approach, the first airway is tilted at an angle of 30° to 45° relative to the vertical direction.

[0008] In one possible implementation, the air intake passage further includes a second air passage, one end of which communicates with the first air passage, and the other end of which penetrates the outer wall of the cleaning seat and is used to connect to an external high-pressure air source.

[0009] In one possible implementation, the first airway is an annular funnel-shaped structure; there are multiple second airways, which are evenly spaced around the first airway and are connected to different positions of the first airway.

[0010] In one possible implementation, the cleaning seat includes an upper base and a lower base connected to each other. The upper base includes a main board portion and an extension portion protruding downward from the lower surface of the main board portion. The main board portion is located above the lower base and connected to the lower base. The negative pressure channel is disposed vertically through the main board portion and the extension portion.

[0011] The lower base is provided with an air guide hole that extends vertically through the lower base; the extension is inserted into the air guide hole, and the lower end of the extension is located above the lower end of the air guide hole; the blowing chamber is located below the extension and is formed between the lower end of the extension and the inner wall of the air guide hole; there is a gap between the outer wall of the extension and the inner wall of the air guide hole, and the first air passage is formed between the outer wall of the extension and the inner wall of the air guide hole; the second air passage is arranged laterally in the lower base, one end of the second air passage is connected to the air guide hole, and the other end of the second air passage extends through the outer wall of the lower base.

[0012] In one possible implementation, the second airway is a circular perforation structure, and the width of the gap between the outer wall of the extension and the inner wall of the air guide hole is smaller than the diameter of the second airway.

[0013] In one possible implementation, the air guide hole includes an upper air hole and a lower air hole that are connected vertically. The upper air hole is located above the lower air hole, the extension is inserted into the upper air hole, and the lower air hole is located below the extension. The extension is an inverted frustum-shaped structure with a gradually decreasing outer diameter from top to bottom, and the upper air hole is a funnel-shaped hole with a gradually decreasing diameter from top to bottom, so that the first air passage is formed into an annular funnel-shaped structure. The blowing chamber is formed between the lower end of the extension and the inner wall of the lower air hole.

[0014] In one possible implementation, the negative pressure channel includes a first air hole and a second air hole, the first air hole being located above the second air hole, the upper end of the first air hole communicating with the atmosphere, and the upper and lower ends of the second air hole communicating with the first air hole and the blowing chamber, respectively; the first air hole is a funnel-shaped hole with a gradually decreasing diameter from top to bottom, and the second air hole is a cylindrical hole.

[0015] In one possible embodiment, the oil collecting trough is provided with an oil collecting chamber and an exhaust chamber. The oil collecting chamber is located directly below the air blowing chamber and communicates with the air blowing chamber. The exhaust chamber is located on the outer periphery of the oil collecting chamber. A partition is provided between the exhaust chamber and the oil collecting chamber. The bottom of the exhaust chamber communicates with the bottom of the oil collecting chamber and communicates with the atmosphere.

[0016] This utility model provides a nozzle cleaning mechanism for oil dispensers. It includes a cleaning seat and an oil collection tank. The cleaning seat contains an air inlet channel, a negative pressure channel, and an air blowing chamber. When high-pressure gas from the outside enters the air blowing chamber through the air inlet channel, a negative pressure is created in the negative pressure channel. When the lower end of the nozzle is inserted into the negative pressure channel, residual oil on the nozzle is drawn downwards into the air blowing chamber under the negative pressure. Simultaneously, due to the negative pressure state within the negative pressure channel, external airflow is drawn into it and blows off the residual oil on the nozzle. When the lower end of the nozzle is inserted into and below the air blowing chamber, residual oil on the nozzle is blown off by the high-speed airflow, thus cleaning the nozzle. The cleaned residual oil falls into the oil collection tank for collection.

[0017] This oil gun needle cleaning mechanism uses high-pressure gas as the cleaning source, enabling non-contact cleaning of the needle without affecting its positional accuracy, thus improving product quality. It also boasts high cleaning efficiency and can be used for extended periods without frequent cleaning, further enhancing production efficiency. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the oiling gun needle cleaning mechanism and the oiling gun in the embodiments of this utility model.

[0019] Figure 2 This is a cross-sectional schematic diagram of the oil gun needle cleaning mechanism in an embodiment of this utility model.

[0020] Figure 3 This is an exploded structural diagram of the oil gun needle cleaning mechanism in an embodiment of this utility model.

[0021] Figure 4 This is a cross-sectional schematic diagram of the cleaning seat in an embodiment of this utility model.

[0022] Figure 5 This is a cross-sectional schematic diagram of the lower base in an embodiment of this utility model.

[0023] Figure 6 This is an exploded structural diagram of the cleaning seat in an embodiment of this utility model.

[0024] Figure 7 for Figure 6 A bottom view.

[0025] Figure 8 and Figure 9 This is a schematic diagram illustrating the working process of the oil gun needle cleaning mechanism in this embodiment of the present invention. Detailed Implementation

[0026] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0027] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0028] like Figures 1 to 9 As shown, the oil gun needle cleaning mechanism provided in this embodiment of the present invention is used to clean residual oil on the needle 41 of the oil gun 4 (the residual oil is generally concentrated at the lower end of the needle 41; the residual oil is generally lubricating oil). The oil gun needle cleaning mechanism includes a cleaning seat 1 and an oil collection groove 2 disposed below the cleaning seat 1. The cleaning seat 1 and the oil collection groove 2 are fixedly connected (the two can be connected by bolts, etc.).

[0029] The cleaning seat 1 is equipped with an air inlet channel 13, a negative pressure channel 14, and an air blowing chamber 15. The negative pressure channel 14 is located directly above the air blowing chamber 15, with its upper end connected to the external atmosphere and its lower end connected to the air blowing chamber 15. The negative pressure channel 14 and the air blowing chamber 15 run vertically through the cleaning seat 1. The oil collection tank 2 is located below the air blowing chamber 15 and is connected to it.

[0030] The air intake channel 13 is used to connect to an external high-pressure air source (not shown in the figure). This external high-pressure air source can be, for example, an air compressor or other equipment capable of generating high-pressure gas. The air intake channel 13 is connected to the air blowing chamber 15. The air intake channel 13 is used to deliver high-pressure gas (the pressure of high-pressure gas is greater than atmospheric pressure) generated by the external high-pressure air source into the air blowing chamber 15, thereby creating a negative pressure in the negative pressure channel 14. Specifically, according to Bernoulli's principle, the greater the airflow velocity, the lower the pressure. When the high-pressure gas enters the air blowing chamber 15, it forms a high-speed airflow (the velocity of high-pressure gas increases when entering a low-pressure environment), causing the pressure in the air blowing chamber 15 to decrease. Under the action of the pressure difference between the air blowing chamber 15 and the negative pressure channel 14, air in the negative pressure channel 14 is drawn into the air blowing chamber 15, thus creating a negative pressure in the negative pressure channel 14.

[0031] The dimensions of the negative pressure channel 14 and the air blowing chamber 15 are both larger than the outer diameter of the needle 41. The lower end of the needle 41 can be inserted into the negative pressure channel 14 and the air blowing chamber 15 respectively, so as to clean the residual oil on the needle 41 under the action of negative pressure and the action of high-speed airflow (it should be noted that when the lower end of the needle 41 is inserted below the air blowing chamber 15, the high-speed airflow can also blow air onto the needle 41).

[0032] The oil nozzle needle cleaning mechanism provided in this embodiment of the invention comprises a cleaning seat 1 and an oil collection tank 2. The cleaning seat 1 includes an air inlet channel 13, a negative pressure channel 14, and an air blowing chamber 15. When external high-pressure gas enters the air blowing chamber 15 through the air inlet channel 13, a negative pressure is created in the negative pressure channel 14. When the lower end of the needle 41 is inserted into the negative pressure channel 14, residual oil on the needle 41 is drawn downwards into the air blowing chamber 15 under the negative pressure. Simultaneously, due to the negative pressure state within the negative pressure channel 14, external airflow is drawn into the negative pressure channel 14 and blows off the residual oil on the needle 41. When the lower end of the needle 41 is inserted into and below the air blowing chamber 15, the residual oil on the needle 41 is blown off by the high-speed airflow, thus cleaning the residual oil on the needle 41. The cleaned residual oil falls into the oil collection tank 2 for collection.

[0033] The oil gun needle cleaning mechanism uses high-pressure gas as the cleaning source, which can perform non-contact cleaning of the needle 41 (i.e., the needle 41 does not come into contact with the cleaning mechanism during the cleaning process), thus not affecting the positional accuracy of the needle 41, which is beneficial to improving product quality; at the same time, the cleaning efficiency is high, and the cleaning mechanism can be used for a long time without frequent cleaning, thereby improving production efficiency.

[0034] like Figures 2 to 4As shown, in one embodiment, the air intake channel 13 includes a first air passage 131, which is inclined relative to the vertical direction Y. The lower end of the first air passage 131 is inclined towards the side closer to the blowing chamber 15 compared to its upper end, and the lower end of the first air passage 131 is directly connected to the blowing chamber 15. By inclining the first air passage 131, the high-speed airflow can be directed towards the lower part of the negative pressure channel 14. On the one hand, this makes it easier for the negative pressure channel 14 to form negative pressure, and on the other hand, the high-speed airflow can better blow air onto the needle 41.

[0035] like Figure 4 As shown, in one embodiment, the first airway 131 has an inclination angle α of 30° to 45° relative to the vertical direction Y.

[0036] like Figures 2 to 5 As shown, in one embodiment, the air intake channel 13 further includes a second air passage 132. One end of the second air passage 132 is connected to the first air passage 131, and the other end of the second air passage 132 penetrates the outer wall of the cleaning seat 1 and is used to connect to an external high-pressure air source. The high-pressure gas generated by the external high-pressure air source can be transported to the blowing chamber 15 in sequence through the second air passage 132 and the first air passage 131.

[0037] like Figures 1 to 5 As shown, in one embodiment, the oil gun needle cleaning mechanism also includes an air pipe connector 3, which is disposed on the cleaning seat 1 and is connected to the second air passage 132. The air pipe connector 3 is used to connect to an external high-pressure air source (the air pipe connector 3 can be connected to an external high-pressure air source through an air pipe).

[0038] like Figures 2 to 5 As shown, in one embodiment, the first air passage 131 is an annular funnel-shaped structure with a gradually decreasing inner diameter from top to bottom; there are multiple second air passages 132, which are evenly spaced around the first air passage 131 (i.e., equally spaced), and each of the multiple second air passages 132 communicates with different positions of the first air passage 131. By setting multiple second air passages 132, the air intake volume can be increased, thereby improving the negative pressure effect generated in the negative pressure channel 14; at the same time, since the first air passage 131 is an annular funnel-shaped structure and the multiple second air passages 132 are evenly arranged, the airflow is uniform, turbulence is avoided, and a stable negative pressure is formed in the negative pressure channel 14. In this embodiment, there are two second air passages 132, which are respectively set on opposite sides of the first air passage 131; of course, in other embodiments, there can be more second air passages 132, such as four, with the four second air passages 132 respectively set on the four sides of the first air passage 131.

[0039] like Figures 2 to 7As shown, in one embodiment, the cleaning seat 1 includes an upper base 11 and a lower base 12 connected to each other (the two can be connected by bolts, etc.). The upper base 11 includes a main board portion 111 and an extension portion 112 protruding downward from the lower surface of the main board portion 111. The main board portion 111 is located above the lower base 12 and connected to the lower base 12. The negative pressure channel 14 is disposed vertically through the main board portion 111 and the extension portion 112.

[0040] A lower base 12 is provided with an air guide hole 120, which extends vertically through the lower base 12. An extension 112 is inserted into the air guide hole 120 from top to bottom, with the lower end of the extension 112 located above the lower end of the air guide hole 120 (i.e., the height of the extension 112 is less than the height of the air guide hole 120). An air blowing chamber 15 is located below the extension 112 and is formed between the lower end of the extension 112 and the inner wall of the air guide hole 120. There is a gap between the outer wall of the extension 112 and the inner wall of the air guide hole 120, and a first air passage 131 is formed between the outer wall of the extension 112 and the inner wall of the air guide hole 120. A second air passage 132 is arranged laterally within the lower base 12, with one end of the second air passage 132 communicating with the air guide hole 120 and the other end of the second air passage 132 penetrating through the outer wall of the lower base 12.

[0041] like Figure 4 and Figure 5 As shown, in one embodiment, the second air passage 132 is a circular hole structure (i.e., the second air passage 132 is a circular hole), and the width of the gap between the outer wall of the extension 112 and the inner wall of the air guide hole 120 is smaller than the diameter of the second air passage 132. This arrangement makes the first air passage 131 narrower than the second air passage 132, allowing the high-pressure gas to be compressed and accelerated when entering the first air passage 131 from the second air passage 132, thereby further increasing the velocity of the high-speed airflow and enhancing the negative pressure effect generated within the negative pressure channel 14.

[0042] like Figures 4 to 7 As shown, in one embodiment, the air guide hole 120 includes an upper air hole 121 and a lower air hole 122 that are connected vertically. The upper air hole 121 is located above the lower air hole 122, and both the upper air hole 121 and the lower air hole 122 penetrate vertically through the lower base 12. An extension 112 is inserted into the upper air hole 121, and the lower air hole 122 is located below the extension 112. A first air passage 131 is formed between the outer wall of the extension 112 and the inner wall of the upper air hole 121. The extension 112 has an inverted frustum-shaped structure with a gradually decreasing outer diameter from top to bottom, and the upper air hole 121 has a funnel-shaped hole with a gradually decreasing diameter from top to bottom, so that the first air passage 131 is formed into an annular funnel-shaped structure. An air blowing chamber 15 is formed between the lower end of the extension 112 and the inner wall of the lower air hole 122. The shape of the lower air hole 122 can be a cylindrical hole, a funnel-shaped hole, etc.

[0043] like Figures 2 to 7 As shown, in one embodiment, the negative pressure channel 14 includes a first vent 141 and a second vent 142. The first vent 141 is located above the second vent 142, and both the first vent 141 and the second vent 142 penetrate vertically through the upper base 11. The upper end of the first vent 141 communicates with the atmosphere, and the upper and lower ends of the second vent 142 communicate with the first vent 141 and the air blowing chamber 15, respectively. The first vent 141 is a funnel-shaped hole with a gradually decreasing diameter from top to bottom, and the second vent 142 is a cylindrical hole with a diameter equal to the diameter of the lower end of the first vent 141. This arrangement, on the one hand, makes the diameter of the second vent 142 smaller, allowing for better negative pressure to be formed within the second vent 142; on the other hand, the funnel-shaped shape of the first vent 141 facilitates the insertion of the needle 41 and avoids interference or collision with the needle 41.

[0044] like Figures 1 to 3 As shown, in one embodiment, the oil collecting tank 2 is provided with an oil collecting chamber 21 and an exhaust chamber 22. The oil collecting chamber 21 is located directly below the air blowing chamber 15 and communicates with the air blowing chamber 15. The exhaust chamber 22 is located on the outer periphery of the oil collecting chamber 21. A partition 23 is provided between the exhaust chamber 22 and the oil collecting chamber 21. The bottom of the exhaust chamber 22 communicates with the bottom of the oil collecting chamber 21 and is in communication with the atmosphere.

[0045] Specifically, the oil collecting chamber 21 is used to collect oil, and the venting chamber 22 is used to expel air from the oil collecting tank 2 (because air is continuously blown into the oil collecting tank 2 through the air blowing chamber 15 during operation of the oil nozzle needle cleaning mechanism, it is necessary to expel the blown air); at the same time, to prevent oil from entering the venting chamber 22 and being discharged outside the oil collecting tank 2 during the fall, a partition 23 is provided between the venting chamber 22 and the oil collecting chamber 21. Under the blocking effect of the partition 23, oil will not enter the venting chamber 22 during the fall. In this embodiment, an vent 220 is provided above the venting chamber 22, and the venting chamber 22 is connected to the atmosphere through the vent 220. The air in the oil collecting tank 2 is discharged sequentially through the venting chamber 22 and the vent 220. In this embodiment, the venting chamber 22 is located on the front, back, left, and right sides of the oil collecting chamber 21; in other embodiments, the venting chamber 22 may also be located on one side or opposite sides of the oil collecting chamber 21.

[0046] like Figure 1 , Figure 8 and Figure 9 As shown, the working process of the oil gun needle cleaning mechanism at this point is as follows:

[0047] When cleaning the residual oil on the needle 41 of the oiling gun 4, the oiling gun 4 is moved above the oiling gun needle cleaning mechanism by a robotic arm (not shown), and the needle 41 is aligned with the negative pressure channel 14; the external high-pressure air source is turned on, so that negative pressure is generated in the negative pressure channel 14; the robotic arm moves the oiling gun 4 downward so that the lower end of the needle 41 is inserted into the negative pressure channel 14, and then the robotic arm drives the oiling gun 4 to move up and down several times, so that the lower end of the needle 41 switches back and forth in the negative pressure channel 14 and the air blowing chamber 15 several times to suck and blow clean the residual oil on the needle 41. During the cleaning process, the waste oil falls into the oil collection tank 2 for collection; after cleaning is completed, the robotic arm drives the oiling gun 4 to move upward, thus completing the cleaning process.

[0048] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A nozzle cleaning mechanism for a dispensing gun, used to clean residual oil on the nozzle (41) of a dispensing gun (4), characterized in that, The oil gun needle cleaning mechanism includes a cleaning seat (1) and an oil collection groove (2) disposed below the cleaning seat (1). The cleaning seat (1) is provided with an air inlet channel (13), a negative pressure channel (14) and an air blowing chamber (15). The negative pressure channel (14) is located directly above the air blowing chamber (15). The upper end of the negative pressure channel (14) is connected to the atmosphere, and the lower end of the negative pressure channel (14) is connected to the air blowing chamber (15). The negative pressure channel (14) and the air blowing chamber... (15) The cleaning seat (1) runs through the top and bottom; the oil collection groove (2) is located below the air blowing chamber (15) and communicates with the air blowing chamber (15); the air inlet channel (13) communicates with the air blowing chamber (15), and the air inlet channel (13) is used to deliver high-pressure gas to the air blowing chamber (15) so that negative pressure is formed in the negative pressure channel (14); the lower end of the needle (41) can be inserted into the negative pressure channel (14) and the air blowing chamber (15) respectively.

2. The oil gun needle cleaning mechanism as described in claim 1, characterized in that, The air intake channel (13) includes a first air passage (131), which is inclined relative to the vertical direction (Y). The lower end of the first air passage (131) is inclined relative to its upper end toward the side close to the air blowing chamber (15). The lower end of the first air passage (131) is directly connected to the air blowing chamber (15).

3. The oil gun needle cleaning mechanism as described in claim 2, characterized in that, The first airway (131) has an inclination angle of 30° to 45° relative to the vertical direction (Y).

4. The oil gun needle cleaning mechanism as described in claim 2, characterized in that, The air intake channel (13) also includes a second air passage (132), one end of which is connected to the first air passage (131), and the other end of which passes through the outer wall of the cleaning seat (1) and is used to connect to an external high-pressure air source.

5. The oil gun needle cleaning mechanism as described in claim 4, characterized in that, The first airway (131) has an annular funnel-shaped structure; there are multiple second airways (132), which are evenly spaced around the first airway (131) and are connected to different positions of the first airway (131).

6. The oil gun needle cleaning mechanism as described in claim 4, characterized in that, The cleaning seat (1) includes an upper base (11) and a lower base (12) connected to each other. The upper base (11) includes a main board portion (111) and an extension portion (112) protruding downward from the lower surface of the main board portion (111). The main board portion (111) is located above the lower base (12) and connected to the lower base (12). The negative pressure channel (14) is disposed vertically through the main board portion (111) and the extension portion (112). The lower base (12) is provided with an air guide hole (120), which extends vertically through the lower base (12); the extension (112) is inserted into the air guide hole (120), and the lower end of the extension (112) is located above the lower end of the air guide hole (120); the blowing chamber (15) is located below the extension (112), and the blowing chamber (15) is formed at the lower end of the extension (112) and the inner wall of the air guide hole (120). There is a gap between the outer wall of the extension (112) and the inner wall of the air guide hole (120), and the first air passage (131) is formed between the outer wall of the extension (112) and the inner wall of the air guide hole (120); the second air passage (132) is arranged laterally in the lower base (12), one end of the second air passage (132) is connected to the air guide hole (120), and the other end of the second air passage (132) penetrates the outer wall of the lower base (12).

7. The oil gun needle cleaning mechanism as described in claim 6, characterized in that, The second airway (132) is a circular hole structure, and the width of the gap between the outer wall of the extension (112) and the inner wall of the air guide hole (120) is smaller than the diameter of the second airway (132).

8. The oil gun needle cleaning mechanism as described in claim 6, characterized in that, The air guide hole (120) includes an upper air hole (121) and a lower air hole (122) that are connected vertically. The upper air hole (121) is located above the lower air hole (122). The extension (112) is inserted into the upper air hole (121), and the lower air hole (122) is located below the extension (112). The extension (112) is an inverted frustum-shaped structure with a gradually decreasing outer diameter from top to bottom. The upper air hole (121) is a funnel-shaped hole with a gradually decreasing diameter from top to bottom, so that the first air passage (131) is formed into an annular funnel-shaped structure. The blowing chamber (15) is formed between the lower end of the extension (112) and the inner wall of the lower air hole (122).

9. The oil gun needle cleaning mechanism as described in claim 1, characterized in that, The negative pressure channel (14) includes a first air hole (141) and a second air hole (142). The first air hole (141) is located above the second air hole (142). The upper end of the first air hole (141) is connected to the atmosphere. The upper and lower ends of the second air hole (142) are connected to the first air hole (141) and the blowing chamber (15) respectively. The first air hole (141) is a funnel-shaped hole with a gradually decreasing diameter from top to bottom, and the second air hole (142) is a cylindrical hole.

10. The oil gun needle cleaning mechanism as described in any one of claims 1-9, characterized in that, The oil collection trough (2) is provided with an oil collection chamber (21) and an exhaust chamber (22). The oil collection chamber (21) is located directly below the air blowing chamber (15) and is connected to the air blowing chamber (15). The exhaust chamber (22) is located on the outer periphery of the oil collection chamber (21). A partition (23) is provided between the exhaust chamber (22) and the oil collection chamber (21). The bottom of the exhaust chamber (22) is connected to the bottom of the oil collection chamber (21). The exhaust chamber (22) is connected to the atmosphere.

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