Syringe oil spraying device and its oil mist recovery mechanism

Abstract

This invention provides a syringe oil spraying device and its oil mist recovery mechanism, belonging to the technical field of medical device processing equipment. It solves the technical problems of poor oil mist control and inability to recover deposited oil mist in existing technologies. The oil mist recovery mechanism of this syringe oil spraying device includes an oil mist settling cylinder disposed between the syringe rotary conveying mechanism and the frame. Above the syringe rotary conveying mechanism is an oil mist purification mechanism for absorbing oil mist from the air. The oil mist purification mechanism and / or the oil mist settling cylinder are connected to a waste oil collection tank. This invention has advantages such as high oil mist recovery rate, good control effect, resistance to interference, and good stability.

Description

Technical Field

[0001] This utility model belongs to the technical field of medical device processing equipment, and relates to syringe processing device, and in particular to a syringe oil spraying device and its oil mist recovery mechanism. Background Technology

[0002] In the manufacturing process of syringes, the syringe barrel typically undergoes an inner surface siliconization process. This process involves spraying atomized silicone oil to form a uniform silicone oil lubricating layer on the inner wall of the syringe barrel, allowing the piston rod to slide smoothly against the inner wall during injection. In existing technologies, excess oil mist often escapes into the air during the spraying process, polluting the production environment and posing safety hazards. To address these issues, researchers have conducted extensive research and proposed various solutions.

[0003] For example, Chinese patent literature discloses a silicone oil recovery device and a syringe spraying system [Application No.: 202022859655.8], including a frame, a vacuum pump, a connecting pipe, and a flow guide. The vacuum pump is mounted on the frame, and the first end of the connecting pipe is connected to the suction end of the vacuum pump. The flow guide has a cavity with an opening that communicates with the cavity. A flange structure is provided at the opening of the cavity, located within the cavity and extending circumferentially. The second end of the connecting pipe is fixedly connected to the flow guide and is connected to the opening. The syringe spraying system is equipped with the aforementioned silicone oil recovery device. This product can collect excess silicone oil sprayed from a syringe sprayer, thereby improving the environmental quality and visibility within the factory and reducing factory cleaning costs.

[0004] While the above-mentioned solution can recover oil mist, its overall open structure results in poor control of the oil mist. Furthermore, it cannot recover deposited oil mist. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a syringe-based oil spraying device that can control oil mist.

[0006] Another objective of this invention is to provide an oil mist recovery mechanism.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: the oil mist recovery mechanism of the syringe oil spraying device includes an oil mist settling cylinder disposed between the syringe rotary conveying mechanism and the frame, and an oil mist purification mechanism for absorbing oil mist in the air is provided above the syringe rotary conveying mechanism, and the oil mist purification mechanism and / or the oil mist settling cylinder are connected to the waste oil collection tank.

[0008] The oil mist is collected by an oil mist settling tube and the oil mist is collected by an oil mist purification mechanism. The collected oil mist and the oil mist are then concentrated in a waste oil collection tank, thereby achieving the effect of oil mist recovery and control.

[0009] In the oil mist recovery mechanism of the aforementioned syringe oil spraying device, the upper end of the oil mist settling cylinder is open, and the syringe rotary conveying mechanism is disposed inside the oil mist settling cylinder. A shaft hole for the rotary conveying mechanism's shaft to pass through is provided at the center of the oil mist settling cylinder, and a leak-proof sleeve is provided on the shaft hole. The oil mist settling cylinder is connected to a waste oil collection tank through at least one first oil outlet. The rotary conveying mechanism being built into the settling cylinder improves the settling cylinder's recovery effect, and the leak-proof sleeve prevents oil from flowing outside the settling cylinder, thus avoiding contamination of other mechanisms and products.

[0010] In the oil mist recovery mechanism of the aforementioned syringe oil spraying device, a filter plate is provided between the syringe rotary conveying mechanism and the oil mist settling cylinder. The filter plate between the syringe rotary conveying mechanism and the oil mist settling cylinder guides the deposited oil mist to the bottom of the oil mist settling cylinder and prevents foreign objects from clogging the first oil outlet, thereby preventing contamination and further improving recovery stability.

[0011] In the oil mist recovery mechanism of the aforementioned syringe spraying device, a table is provided at the bottom of the oil mist settling cylinder. An oil channel structure is provided on the table to guide the flow of oil on its upper surface. This oil channel structure is connected to a waste oil collection tank via at least one second oil outlet. The table simultaneously supports the syringe rotation conveying mechanism and guides the oil, enhancing the recovery effect while improving space utilization.

[0012] In the oil mist recovery mechanism of the aforementioned syringe spraying device, the oil channel structure includes an annular outer groove formed on the upper surface of the table. Inside the annular outer groove, at least one horizontal groove and at least one vertical groove are formed. The horizontal and vertical grooves are interconnected, and both ends of the horizontal and vertical grooves are connected to the annular outer groove. A second oil outlet, penetrating the table, is provided on the horizontal, vertical, or annular outer groove, and this second oil outlet is connected to a waste oil collection tank. The four points of connection between the horizontal and vertical grooves and the annular outer groove form a flow guiding grid, increasing the coverage of the recovery area and thus improving the recovery rate.

[0013] In the oil mist recovery mechanism of the aforementioned syringe oil spraying device, a central hole is provided on the table, an annular inner groove is provided between the central hole and the table, an annular protrusion is provided between the annular inner groove and the central hole, the transverse groove and the longitudinal groove are interconnected through the annular inner groove, and the second oil outlet is located in the annular inner groove.

[0014] The bottoms of the transverse trough, longitudinal trough, inner annular trough, and outer annular trough are all sloped so that the second oil outlet is located at the lowest point. The second oil outlet, located at the lowest point of the inner annular trough, combined with the trough bottom slope, ensures that waste oil naturally collects and is completely discharged under gravity, avoiding residue. Furthermore, the interconnected design of the transverse trough, longitudinal trough, and outer annular trough creates multiple oil discharge paths, ensuring that even if there is partial blockage, waste oil can still be discharged through other paths.

[0015] In the oil mist recovery mechanism of the aforementioned syringe oil spraying device, a spray gun cleaning box is provided at the bottom of the spray gun assembly on one side of the syringe rotary conveying mechanism. The spray gun cleaning box is connected to a lifting device, and a bottom hole is provided at the bottom of the cleaning box to allow oil to fall into the oil channel structure. Providing a cleaning box at the bottom of the spray gun prevents oil from accumulating on the spray gun surface, reducing the risk of contamination. The automated control of the cleaning process by the lifting device improves continuous operation capability.

[0016] In the oil mist recovery mechanism of the aforementioned syringe oil spraying device, the oil mist purification mechanism includes a hollow cylinder. The lower end of the hollow cylinder is provided with an oil mist inlet, and the upper end of the hollow cylinder is provided with an air outlet. Between the oil mist inlet and the air outlet, there is a negative pressure component that allows oil mist outside the oil mist inlet to be drawn into the hollow cylinder and generate centrifugal motion. Between the negative pressure component and the air outlet, there is an air filter component. Between the negative pressure component and the oil mist inlet, there is a third oil outlet. Between the third oil outlet and the hollow cylinder, there is a spiral oil guide channel. The third oil outlet is connected to a waste oil collection tank.

[0017] By setting up a negative pressure component to generate suction and a spiral oil guide channel design, the oil mist flow path is set so that under the combined action of centrifugal force and suction, the oil mist can be guided to automatically flow into the third oil outlet, achieving the effect of automatic collection.

[0018] In the oil mist recovery mechanism of the above-mentioned syringe oil spraying device, the negative pressure component includes a fan blade and a motor. The motor is connected to the hollow cylinder through a motor frame. The motor frame is provided with an air passage that connects an oil mist inlet and an air supply outlet.

[0019] The air filtration assembly includes at least one oil mist filter element disposed between the negative pressure assembly and the air outlet. The air passage on the motor frame directly connects the oil mist inlet and the air outlet, reducing airflow path detours and thus reducing pressure loss and improving negative pressure efficiency.

[0020] This syringe oil spraying device includes a frame, which is covered by a partition. A syringe rotary conveying mechanism is provided inside the frame. The syringe rotary conveying mechanism is connected to a feed slide and a discharge slide, and the feed slide and discharge slide extend to the outside through the partition. A spray gun assembly is provided on one side of the syringe rotary conveying mechanism. An oil mist recovery mechanism of the syringe oil spraying device as described above is provided between the syringe rotary conveying mechanism and the frame.

[0021] By covering the outside of the frame with baffles, a closed operating environment can be created. The closed structure can improve the stability of the equipment, prevent oil mist from depositing in areas outside the oil mist settling tube and oil channel structure, and also prevent oil mist from escaping into the external environment, thus improving the efficiency of oil mist recovery.

[0022] Compared with existing technologies, the advantages of this syringe oil spraying device and its oil mist recovery mechanism are: 1. Enclosed structure design for better overall oil mist recovery. 2. Incorporating both diffused oil mist recovery and deposited oil mist recovery designs, resulting in a higher oil mist recovery rate. 3. The inclusion of baffles prevents interference from external dust or other foreign matter, leading to better stability. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram provided by this utility model.

[0024] Figure 2 This is a schematic diagram of the internal structure provided by this utility model.

[0025] Figure 3 This is a cross-sectional structural diagram provided by this utility model.

[0026] Figure 4 This is a schematic diagram of the oil mist settling tube and table provided by this utility model.

[0027] Figure 5 This is a top view schematic diagram of the oil mist settling tube and tabletop provided by this utility model.

[0028] Figure 6 This is a schematic diagram of the spray gun assembly provided by this utility model.

[0029] In the diagram, the components are: frame 1, partition 11, hinge 111, lower frame 12, upper frame 13, frame beam 14, syringe rotary conveyor 2, feed chute 21, discharge chute 22, oil mist settling cylinder 3, shaft hole 31, oil leak-proof sleeve 32, first oil outlet 33, filter plate 34, oil mist purification mechanism 4, hollow cylinder 41, oil mist inlet 411, air outlet 412, air duct 413, support leg 414, cylinder support plate 415, negative pressure assembly 42, fan blade 421, motor 422, motor frame 423, and air filter assembly 4. 3. Oil mist filter element 431, third oil outlet 44, oil guide channel 45, waste oil collection bucket 5, first connecting pipe 51, second connecting pipe 52, third connecting pipe 53, table 6, oil passage structure 61, annular outer groove 62, transverse groove 63, longitudinal groove 64, center hole 65, annular inner groove 66, connecting pipe protrusion 661, annular protrusion 67, second oil outlet 68, spray gun assembly 7, spray gun cleaning box 71, lifting device 72, lifting device fixing plate 721, box bottom hole 73, spray gun 74, oil delivery pipeline 741, oil storage bottle 742, translation device 75. Detailed Implementation

[0030] like Figures 1 to 6 As shown, the oil mist recovery mechanism of the syringe oil spraying device includes an oil mist settling cylinder 3 disposed between the syringe rotary conveying mechanism 2 and the frame 1. An oil mist purification mechanism 4 for absorbing oil mist in the air is provided above the syringe rotary conveying mechanism 2. The oil mist purification mechanism 4 and the oil mist settling cylinder 3 are connected to the waste oil collection tank 5.

[0031] In this embodiment, when the syringe on the syringe rotating conveying mechanism 2 is sprayed with oil, a portion of the excess oil mist is deposited on the inner wall of the oil mist settling cylinder 3, while another portion of the oil mist escapes into the air and is collected by the oil mist purification mechanism 4. The oil mist purification mechanism 4 and the oil mist settling cylinder 3 transport the collected oil mist to the waste oil collection tank 5, thereby completing the oil mist recovery effect.

[0032] More specifically, the oil mist settling tube 3 has an opening at the top, and the syringe rotary conveying mechanism 2 is set inside the oil mist settling tube 3. A shaft hole 31 is provided in the center of the oil mist settling tube 3 for the shaft of the rotary conveying mechanism 2 to pass through. An oil leak-proof sleeve 32 is provided on the shaft hole 31. The oil mist settling tube 3 is connected to the waste oil collection tank 5 through a first oil outlet hole 33.

[0033] More specifically, a filter plate 34 is provided between the syringe rotary delivery mechanism 2 and the oil mist settling cylinder 3.

[0034] More specifically, the bottom of the oil mist settling cylinder 3 is provided with a table 6, and an oil channel structure 61 is provided on the table 6 to guide the flow of oil on the upper surface of the table 6. The oil channel structure 61 is connected to the waste oil collection tank 5 through a second oil outlet 68.

[0035] More specifically, the oil channel structure 61 includes an annular outer groove 62 disposed on the upper surface of the table plate 6. A transverse groove 63 and a longitudinal groove 64 are provided inside the annular outer groove 62. The transverse groove 63 and the longitudinal groove 64 are interconnected, and the two ends of the transverse groove 63 and the two ends of the longitudinal groove 64 are respectively connected to the annular outer groove 62. A second oil outlet 68 is provided on the transverse groove 63, the longitudinal groove 64 or the annular outer groove 62, which passes through the table plate 6. The second oil outlet 68 is connected to the waste oil collection tank 5.

[0036] More specifically, a central hole 65 is provided on the tabletop 6, an annular inner groove 66 is provided between the central hole 65 and the tabletop 6, an annular protrusion 67 is provided between the annular inner groove 66 and the central hole 65, the transverse groove 63 and the longitudinal groove 64 are interconnected through the annular inner groove 66, and the second oil outlet 68 is provided in the annular inner groove 66.

[0037] In this embodiment, the bottoms of the transverse groove 63, longitudinal groove 64, annular inner groove 66, and annular outer groove 62 are respectively provided with slopes so that the second oil outlet 68 is located at the lowest point.

[0038] like Figure 4 As shown, the first connector 51 passes through the oil passage structure 61, and a connector protrusion 661 is provided around the first connector 51 at the position where the first connector 51 contacts the oil passage structure 61.

[0039] More specifically, the bottom of the spray gun assembly 7 on one side of the syringe rotary delivery mechanism 2 is provided with a spray gun cleaning box 71. The spray gun cleaning box 71 is connected to the lifting device 72. The bottom of the spray gun cleaning box 71 is provided with a box bottom hole 73 that allows oil to fall into the oil passage structure 61.

[0040] In this embodiment, the spray gun assembly 7 includes a spray gun 74 located at the end. The spray gun 74 is connected to an oil storage bottle 742 located above the spray gun 74 via an oil supply pipe 741. Above the lifter 72 is a translator 75 that can control the translation of the spray gun 74. The lifter 72 is fixed to the table 6 via a lifter fixing plate 721, which is located at the top of the longitudinal groove 64.

[0041] More specifically, the oil mist purification mechanism 4 includes a hollow cylinder 41, with an oil mist inlet 411 at the lower end and an air outlet 412 at the upper end. A negative pressure component 42 is provided between the oil mist inlet 411 and the air outlet 412, which allows oil mist outside the oil mist inlet 411 to be drawn into the hollow cylinder 41 and generate centrifugal motion. An air filter component 43 is provided between the negative pressure component 42 and the air outlet 412. A third oil outlet 44 is provided between the negative pressure component 42 and the oil mist inlet 411. A spiral oil guide channel 45 is provided between the third oil outlet 44 and the hollow cylinder 41. The third oil outlet 44 is connected to the waste oil collection tank 5.

[0042] In this embodiment, the first oil outlet 33 is connected to the waste oil collection tank 5 via the first connecting pipe 51; the second oil outlet 68 is connected to the waste oil collection tank 5 via the second connecting pipe 52; and the third oil outlet 44 is connected to the waste oil collection tank 5 via the third connecting pipe 53.

[0043] More specifically, the negative pressure assembly 42 includes a fan blade 421 and a motor 422. The motor 422 is connected to the hollow cylinder 41 via a motor frame 423. The motor frame 423 is provided with an air passage 413 that communicates with the oil mist inlet 411 and the air outlet 412.

[0044] The air filter assembly 43 includes two layers of oil mist filter elements 431 disposed between the negative pressure assembly 42 and the air outlet 412.

[0045] In this embodiment, a coarse oil mist filter element 431 is provided around the motor 423, and a fine oil mist filter element 431 is provided between the motor 423 and the air outlet 412. The hollow cylinder 41 is connected to the cylinder support plate 415 by three support legs 414 located at the bottom, and the cylinder support plate 415 is fixedly connected to the frame 1 through three connection points.

[0046] like Figures 1 to 6 As shown, this syringe oil spraying device includes a frame 1, which is covered by a partition 11. A syringe rotary conveying mechanism 2 is provided inside the frame 1. The syringe rotary conveying mechanism 2 is connected to the feed slide 21 and the discharge slide 22. The feed slide 21 and the discharge slide 22 extend to the outside through the partition 11 respectively. A spray gun assembly 7 is provided on one side of the syringe rotary conveying mechanism 2. An oil mist recovery mechanism as described above is provided between the syringe rotary conveying mechanism 2 and the frame 1.

[0047] In this embodiment, the syringe is conveyed by the feed chute 21, the discharge chute 22 and the syringe rotary conveying mechanism 2. The cover plate 11 is set on the outside of the frame 1 to form a closed environment inside the frame 1, thereby preventing the spread of oil mist and promoting the recovery of oil mist.

[0048] like Figure 1 As shown, the rack 1 includes multiple vertically and horizontally arranged rack beams 14. A partition 11, covering the outside of the rack, is disposed within a square frame formed by the rack beams 14. The partition 1 is closable to the rack 1 via hinges 111. The rack 1 includes a lower rack 12 and an upper rack 13. A table 6 is disposed between the lower rack 12 and the upper rack 13, connecting the two racks.

[0049] The working principle of this embodiment is that the unprocessed syringe is transported to the spray gun assembly 7 through the feeding slide 21, and then the processed syringe is sent out along the discharge slide 22 by the syringe rotation conveying mechanism 2. During this process, the spray gun assembly 7 continuously and evenly covers the inner surface of the syringe with silicone oil in a mist, and the lifting device 72 continuously controls the spray gun 74 to enter the spray gun cleaning box 71 for cleaning. The cleaned oil falls into the oil channel structure 61 directly below through the bottom hole 73 of the box.

[0050] Some oil mist is deposited on the inner wall of the oil mist settling cylinder 3. The deposited oil mist flows through the filter plate 34 between the syringe rotary conveying mechanism 2 and the oil mist settling cylinder 3, and finally flows into the waste oil collection tank 5 through the first oil outlet 33 at the bottom of the oil mist settling cylinder 3 and into the first connecting pipe 51.

[0051] Other deposited oil mist will be deposited on the table plate 6. The oil channel structure 61, through its slope design, will collect this part of the deposited oil mist from the outer annular groove 62 along the transverse groove 63 and the longitudinal groove 64 to the second oil outlet 68 at the inner annular groove 66, and then flow into the waste oil collection tank 5 through the second pipe 52.

[0052] Oil mist that does not settle and escape into the air will be drawn into the oil mist purification mechanism 4 by the negative pressure component 42 along the air passage 413. The fan blade 421 rotates, causing the oil mist to settle on the inner wall of the hollow cylinder 41. Under the combined action of suction and centrifugal force, the oil flows into the third oil outlet 44 along the spiral oil guide channel 45 set on the inner wall of the hollow cylinder 41, and then flows into the waste oil collection tank 5 through the third pipe 53.

[0053] The remaining air is drawn into the oil mist purification mechanism 4 by the fan blade 421, and after being filtered by the oil mist filter element 431, it is discharged to the outside through the air outlet 412. At this point, the oil mist recovery process is completed.

[0054] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0055] Although this article uses a lot of terms such as frame, partition, hinge, lower frame, upper frame, frame beam, syringe rotary conveyor, feed chute, discharge chute, oil mist settling cylinder, shaft hole, leak-proof sleeve, first oil outlet, filter plate, oil mist purification mechanism, hollow cylinder, oil mist inlet, air outlet, air duct, support leg, cylinder support plate, negative pressure assembly, fan blade, motor, motor frame, air filter assembly, oil mist filter element, third oil outlet, oil guide channel, waste oil collection tank, first connecting pipe, second connecting pipe, third connecting pipe, table, oil channel structure, annular outer groove, transverse groove, longitudinal groove, center hole, annular inner groove, connecting pipe protrusion, annular protrusion, second oil outlet, spray gun assembly, spray gun cleaning box, lifting device, lifting device fixing plate, box bottom hole, spray gun, oil pipeline, oil storage bottle, and translator, the possibility of using other terms cannot be ruled out. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model, and interpreting them as any kind of additional limitation would be contrary to the spirit of this utility model.

Claims

1. An oil mist recovery mechanism for a syringe oil spraying device, characterized in that, It includes an oil mist settling cylinder (3) disposed between the syringe rotary conveying mechanism (2) and the frame (1), and an oil mist purification mechanism (4) for absorbing oil mist in the air is provided above the syringe rotary conveying mechanism (2), and the oil mist purification mechanism (4) and / or the oil mist settling cylinder (3) are connected to the waste oil collection tank (5). The oil mist settling cylinder (3) has an opening at the top. The syringe rotary conveying mechanism (2) is set inside the oil mist settling cylinder (3). A shaft hole (31) for the rotating shaft of the rotary conveying mechanism (2) to pass through is provided in the center of the oil mist settling cylinder (3). An oil leak-proof sleeve (32) is provided on the shaft hole (31). The oil mist settling cylinder (3) is connected to the waste oil collection tank (5) through at least one first oil outlet hole (33).

2. The oil mist recovery mechanism of the syringe oil spraying device according to claim 1, characterized in that, A filter plate (34) is provided between the syringe rotary conveying mechanism (2) and the oil mist settling cylinder (3).

3. The oil mist recovery mechanism of the syringe oil spraying device according to claim 1, characterized in that, The bottom of the oil mist settling cylinder (3) is provided with a table (6), and an oil channel structure (61) is provided on the table (6) to guide the flow of oil on the upper surface of the table (6). The oil channel structure (61) is connected to the waste oil collection tank (5) through at least one second oil outlet (68).

4. The oil mist recovery mechanism of the syringe oil spraying device according to claim 3, characterized in that, The oil passage structure (61) includes an annular outer groove (62) provided on the upper surface of the table (6). At least one horizontal groove (63) and at least one vertical groove (64) are provided inside the annular outer groove (62). The horizontal groove (63) and the vertical groove (64) are interconnected. The two ends of the horizontal groove (63) and the two ends of the vertical groove (64) are respectively connected to the annular outer groove (62). The horizontal groove (63), the vertical groove (64) or the annular outer groove (62) are provided with a second oil outlet (68) passing through the table (6). The second oil outlet (68) is connected to the waste oil collection bucket (5).

5. The oil mist recovery mechanism of the syringe oil spraying device according to claim 4, characterized in that, The tabletop (6) has a central hole (65), and an annular inner groove (66) is provided between the central hole (65) and the tabletop (6). An annular protrusion (67) is provided between the annular inner groove (66) and the central hole (65). The transverse groove (63) and the longitudinal groove (64) are connected to each other through the annular inner groove (66). The second oil outlet (68) is located in the annular inner groove (66).

6. The oil mist recovery mechanism of the syringe oil spraying device according to claim 3, characterized in that, The bottom of the spray gun assembly (7) on one side of the syringe rotary delivery mechanism (2) is provided with a spray gun cleaning box (71). The spray gun cleaning box (71) is connected to the lifting device (72). The bottom of the spray gun cleaning box (71) is provided with a box bottom hole (73) that allows oil to fall into the oil passage structure (61).

7. The oil mist recovery mechanism of the syringe oil spraying device according to any one of claims 1-6, characterized in that, The oil mist purification mechanism (4) includes a hollow cylinder (41), with an oil mist inlet (411) at the lower end and an air outlet (412) at the upper end. A negative pressure component (42) is provided between the oil mist inlet (411) and the air outlet (412) to allow oil mist outside the oil mist inlet (411) to be drawn into the hollow cylinder (41) and generate centrifugal motion. An air filter component (43) is provided between the negative pressure component (42) and the air outlet (412). A third oil outlet (44) is provided between the negative pressure component (42) and the oil mist inlet (411). A spiral oil guide channel (45) is provided between the third oil outlet (44) and the hollow cylinder (41). The third oil outlet (44) is connected to a waste oil collection tank (5).

8. The oil mist recovery mechanism of the syringe oil spraying device according to claim 7, characterized in that, The negative pressure component (42) includes a fan blade (421) and a motor (422). The motor (422) is connected to the hollow cylinder (41) via a motor frame (423). The motor frame (423) is provided with an air passage (413) that communicates with the oil mist inlet (411) and the air outlet (412). The air filter assembly (43) includes at least one layer of oil mist filter element (431) disposed between the negative pressure assembly (42) and the air outlet (412).

9. A syringe oil spraying device, characterized in that, The device includes a frame (1), which is covered by a partition (11). A syringe rotary conveying mechanism (2) is provided inside the frame (1). The syringe rotary conveying mechanism (2) is connected to the feed slide (21) and the discharge slide (22). The feed slide (21) and the discharge slide (22) extend to the outside through the partition (11) respectively. A spray gun assembly (7) is provided on one side of the syringe rotary conveying mechanism (2). An oil mist recovery mechanism of the syringe oil spraying device as described in any one of claims 1-8 is provided between the syringe rotary conveying mechanism (2) and the frame (1).

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