Vacuum coating device for automobile accessories
By installing anti-sway and rotation coating components in the automotive trim coating equipment, the problems of uneven coating and the effects of shaking are solved, and rapid and uniform coating and efficient processing of automotive trims are achieved.
Patent Information
- Application Number
- CN202410801516.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-20
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2044-06-20
AI Technical Summary
During the coating process, existing automotive trim coating equipment has uneven coating due to the suspension of the automotive trim, and the shaking during rotation affects the coating quality.
Design a vacuum coating device for automobile trim parts. By setting up anti-sway components and rotating coating components, it ensures that metal materials are evenly condensed on the surface of automobile trim parts, and by alternately clamping and rotating components to ensure uniform coating at each position.
It achieves rapid and uniform coating of automotive trim parts, ensures coating quality, and shortens coating time by alternately clamping and rotating components to improve processing efficiency.
Smart Images

Figure CN118639186B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of automobile decoration processing, and in particular to a vacuum coating device for automobile decoration. Background Art
[0002] Automotive accessories have the function of decorating and beautifying cars. The quality of their decorative effects directly affects the interior and exterior image of the car. People will choose accessories in a targeted manner according to the actual situation of the car, based on the principles of beauty, coordination, practicality and safety, to ensure the decorative effect. In the process of producing automotive accessories, the automotive accessories need to be cleaned in a dust-free workshop first, then dried, and finally placed in a vacuum coating machine for coating.
[0003] In the prior art, when coating automobile accessories, the automobile accessories are usually placed in a vacuum coating machine, and then the metal material for evaporation is wrapped on a heating wire. The temperature of the heating wire is used to evaporate the metal material and then condense on the automobile accessories to form a thin film. However, when the automobile accessories are hung in the vacuum coating machine, since the automobile accessories are generally suspended statically on a placement rack, the distance between each surface of the automobile accessories and the heating wire is different, resulting in uneven coating of the automobile accessories after coating. In order to solve this problem, some existing equipment uses a motor to drive the placement rack to rotate, so that each surface of the automobile accessories can be evenly coated. However, when the automobile accessories rotate, since the automobile accessories are directly suspended on the placement rack, the automobile accessories will be in a shaking state, which will affect the quality of the coating on the automobile accessories. Therefore, it is necessary to design a vacuum coating device for automobile accessories to solve the above problem. Summary of the invention
[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art, and a vacuum coating device for automobile accessories is proposed. The device, through the setting of an anti-sway component and a rotating coating component, allows the evaporated metal material to condense quickly and evenly on the surface of the automobile accessories, while ensuring the quality of the coating of the automobile accessories. By alternately clamping the two clamping blocks, it can avoid the situation where the clamping area on the automobile accessories cannot be coated. Through the setting of the rotating component, each position of the automobile accessories can be evenly coated.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions:
[0006] A vacuum coating device for automobile accessories comprises a box body, a sliding door is rotatably connected to the front side of the box body, a rotating coating assembly is arranged in the box body, the rotating coating assembly comprises a driving motor installed at the upper end of the box body, the output shaft end of the driving motor extends into the box body and is fixedly connected to a short rod, the lower end of the short rod is fixedly connected to a first disk, the lower end of the first disk is rotatably connected to two thin rods, a plurality of placement racks are arranged on the two thin rods, a second disk is arranged at the lower end of the two thin rods, a circular opening is arranged on the second disk, two rectangular plates are arranged in the box body, a plurality of vertical rods are fixedly connected to adjacent sides of the two rectangular plates, and an electric heating rod is fixedly connected to adjacent sides of each two matching vertical rods.
[0007] Preferably, each of the placement racks is provided with an anti-sway component, and the anti-sway component includes two rectangular blocks fixedly connected to the lower end of the placement rack, and the adjacent sides of the two rectangular blocks are provided with rectangular grooves, and the two rectangular grooves are slidably connected with clamping blocks, and each of the clamping blocks is elastically connected to the inner wall of the corresponding rectangular groove by a spring, and an electromagnet is embedded on the side of each rectangular groove away from the electric heating rod.
[0008] Preferably, each of the placement racks is provided with a notch, a pressure sensor is installed at the inner bottom of each notch, a conductive rod is fixedly connected to the outer wall of the short rod, and two conductive blocks are fixedly connected to the inner top of the box body.
[0009] Preferably, it also includes a lifting assembly, which includes a threaded sleeve arranged in a box body, the threaded sleeve is rotatably connected to the inner bottom of the box body, the threaded sleeve is elastically connected to the inner bottom of the box body by a torsion spring, the threaded sleeve is internally threaded with a threaded rod, the upper end of the threaded rod is fixedly connected to a rectangular plate located below, two telescopic rods are fixedly connected to the inner bottom of the box body, the telescopic ends of the two telescopic rods are fixedly connected to the rectangular plate located below, the inner bottom of the box body is rotatably connected to a second rotating rod, the second rotating rod is provided with an incomplete gear, and the threaded sleeve is provided with a first gear.
[0010] Preferably, a guide rod is fixedly connected to the lower end of the first disc, and the lower end of the guide rod passes through the rectangular plate located above and is fixedly connected to the limiting disc.
[0011] Preferably, the inner top and the inner bottom of the box body are rotatably connected with a first rotating rod, the first rotating rod is connected to the short rod via a first transmission assembly, the first rotating rod is connected to the second rotating rod via a second transmission assembly, the first transmission assembly includes a first sprocket arranged on the short rod and the first rotating rod, the two first sprockets are connected via a first chain, the second transmission assembly includes a second sprocket arranged on the first rotating rod and the second rotating rod, the two second sprockets are connected via a second chain.
[0012] Preferably, a rotating assembly is provided above the second disc, and the rotating assembly includes two rotating boxes arranged above the second disc, the two thin rods both penetrate the rotating boxes, the parts of the two thin rods located in the rotating boxes are fixedly connected to the second gear, the rear inner walls of the two rotating boxes are fixedly connected to pneumatic rods, the telescopic ends of the two pneumatic rods are fixedly connected to moving blocks, and the front sides of the two moving blocks are provided with racks that match the second gear.
[0013] Preferably, a sensing block is fixedly connected to the lower end of the second disc, and an infrared counting sensor is installed at the inner bottom of the box.
[0014] Preferably, a negative pressure pump is installed on the left side of the box body, and the air inlet end of the negative pressure pump is connected with the top space of the box body through a connecting pipe.
[0015] The present invention has the following beneficial effects:
[0016] 1. Compared with the prior art, by rotating the coating assembly, when coating the automotive accessories, the evaporated metal material can be more quickly and evenly contacted with the automotive accessories and then condensed, thereby improving the coating efficiency of the automotive accessories;
[0017] 2. Compared with the prior art, the anti-sway component can be set to clamp the automobile accessories when coating them, so that the shaking of the automobile accessories can be avoided during the rotation of the clamped accessories, thereby ensuring the coating quality of the automobile accessories;
[0018] 3. Compared with the prior art, the setting of the bent pipe enables the two clamping blocks on the same side to contact the automobile accessories alternately when clamping the automobile accessories, so that the automobile accessories are alternately clamped, so that each position on the automobile accessories can be coated, thereby ensuring the coating quality of the automobile accessories;
[0019] 4. Compared with the prior art, by setting the lifting assembly, during vacuum coating, multiple electric heating rods will drive the metal material to move up and down continuously, so that the metal material can be quickly adhered to various positions of the automotive accessories after evaporation, thereby reducing the coating time of the automotive accessories and improving the processing efficiency of the automotive accessories;
[0020] 5. Compared with the prior art, by setting an infrared counting sensor, after the second disc rotates to a specified number of circles, the controller will control the pneumatic rod to stretch or contract, thereby rotating the thin rod, so that the other side of the automotive trim can be closer to the electric heating rod, so that the evaporated metal material can evenly form a thin film on all surfaces of the automotive trim.
[0021] In summary, the present application enables metal materials to be evenly coated on automobile accessories through the rotation of automobile accessories, and the anti-sway component can prevent the shaking during rotation from affecting the coating. At the same time, alternating clamping is used to ensure that all positions of the automobile accessories can be coated to ensure the quality of the coating, and the setting of the lifting component and the rotating component can shorten the coating time to a certain extent, thereby improving the processing efficiency of automobile accessories. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 A schematic structural diagram of a vacuum coating device for automobile accessories proposed by the present invention;
[0023] Figure 2 for Figure 1 Schematic diagram of the internal structure;
[0024] Figure 3 for Figure 2 A structural diagram from another perspective;
[0025] Figure 4 It is a schematic diagram of the structure of the anti-sway component;
[0026] Figure 5 for Figure 4 A cross-sectional view from another perspective;
[0027] Figure 6 for Figure 3 A partial enlarged view of
[0028] Figure 7 Schematic diagram of the internal structure of the rotating box.
[0029] In the figure: 1 box, 2 negative pressure pump, 3 connecting pipe, 4 driving motor, 5 sliding door, 6 first disc, 7 rectangular plate, 8 guide rod, 9 vertical rod, 10 electric heating rod, 11 thin rod, 12 placement rack, 13 second disc, 14 rotating box, 15 conductive block, 16 first transmission assembly, 17 conductive rod, 18 first rotating rod, 19 threaded rod, 20 notch, 21 pressure sensor, 22 rectangular block, 23 clamping block, 24 elbow, 25 electromagnet, 26 spring, 27 circular mouth, 28 telescopic rod, 29 threaded sleeve, 30 first gear, 31 torsion spring, 32 incomplete gear, 33 second rotating rod, 34 second transmission assembly, 35 rack, 36 second gear, 37 moving block, 38 pneumatic rod, 39 induction block, 40 infrared counting sensor. DETAILED DESCRIPTION
[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0031] Reference Figure 1-Figure 7A vacuum coating device for automobile accessories comprises a box body 1, a sliding door 5 is rotatably connected to the front side of the box body 1, a negative pressure pump 2 is installed on the left side of the box body 1, and the negative pressure pump 2 can evacuate the box body 1 into a vacuum state after the sliding door 5 is closed. The air inlet end of the negative pressure pump 2 is connected to the top space of the box body 1 through a connecting pipe 3. A rotating coating component is arranged in the box body 1, and the rotating coating component comprises a driving motor 4 installed at the upper end of the box body 1. The output shaft end of the driving motor 4 extends into the box body 1 and is fixedly connected to a short rod. The lower end of the short rod is fixedly connected to a first disc 6. The lower end of the first disc 6 is rotatably connected to two thin rods 11. A plurality of placement racks 12 are arranged on the two thin rods 11, a second disc 13 is arranged at the lower end of the two thin rods 11, the two thin rods 11 are rotatably connected to the second disc 13, a circular opening 27 is arranged on the second disc 13, so that the second disc 13 forms a circular ring, two rectangular plates 7 are arranged in the box body 1, adjacent sides of the two rectangular plates 7 are commonly fixedly connected with a plurality of vertical rods 9, and adjacent sides of every two matching vertical rods 9 are commonly fixedly connected with an electric heating rod 10. During vacuum coating, the metal material is wound on the electric heating rod 10, and the metal material is heated by the electric heating rod 10, so that the metal material evaporates.
[0032] Among them, each placement rack 12 is provided with an anti-sway component, and the anti-sway component includes two rectangular blocks 22 fixedly connected to the lower end of the placement rack 12, and the adjacent sides of the two rectangular blocks 22 are provided with rectangular grooves, and the two rectangular grooves are slidably connected with clamping blocks 23, and each clamping block 23 is elastically connected to the inner wall of the corresponding rectangular groove through a spring 26. An electromagnet 25 is embedded on the side of each rectangular groove away from the electric heating rod 10, and each placement rack 12 is provided with a notch 20. A pressure sensor 21 is installed at the inner bottom of each notch 20, and a plurality of control switches are provided. The pressure sensor 21 is squeezed and transmitted to the controller, and the controller controls the corresponding The control switch is closed, a conductive rod 17 is fixedly connected to the outer wall of the short rod, two conductive blocks 15 are fixedly connected to the inner top of the box body 1, the conductive rod 17 and the conductive block 15 located on the right side constitute a second conductive switch, a power supply is provided on the box body 1, the power supply, multiple control switches, a first conductive switch, a second conductive switch and multiple electromagnets 25 constitute a loop through wires, multiple control switches and corresponding electromagnets 25 are connected in series in the loop, the first conductive switch, multiple electromagnets 25 located on the front side and the corresponding control switch are connected in series in the loop, and the second conductive switch, multiple electromagnets 25 located on the rear side and the corresponding control switch are connected in series in the loop.
[0033] The lifting assembly further includes a threaded sleeve 29 disposed in the box body 1, the threaded sleeve 29 is rotatably connected to the inner bottom of the box body 1, the threaded sleeve 29 is elastically connected to the inner bottom of the box body 1 through a torsion spring 31, the threaded sleeve 29 is internally threadedly connected to a threaded rod 19, the upper end of the threaded rod 19 is fixedly connected to a rectangular plate 7 located below, the inner bottom of the box body 1 is fixedly connected to two telescopic rods 28, the telescopic ends of the two telescopic rods 28 are fixedly connected to the rectangular plate 7 located below, and the inner bottom of the box body 1 is rotatably connected to a second rotating rod 3 3. An incomplete gear 32 is provided on the second rotating rod 33, and a first gear 30 is provided on the threaded sleeve 29. When the incomplete gear 32 is meshed with the first gear 30, the threaded sleeve 29 rotates to make the threaded rod 19 move upward. When the incomplete gear 32 is not meshed with the first gear 30, the threaded sleeve 29 rotates in the opposite direction under the elastic action of the torsion spring 31, so that the threaded rod 19 moves downward. The lower end of the first disc 6 is fixedly connected with a guide rod 8, and the lower end of the guide rod 8 passes through the rectangular plate 7 located above and is fixedly connected with the limiting disc.
[0034] Among them, the inner top and inner bottom of the box body 1 are connected to the first rotating rod 18 for rotation together, the first rotating rod 18 is connected to the short rod through the first transmission assembly 16, the first rotating rod 18 is connected to the second rotating rod 33 through the second transmission assembly 34, the first transmission assembly 16 includes a first sprocket arranged on the short rod and the first rotating rod 18, the two first sprockets are connected through a first chain transmission, the second transmission assembly 34 includes a second sprocket arranged on the first rotating rod 18 and the second rotating rod 33, the two second sprockets are connected through a second chain transmission.
[0035] Among them, a rotating component is provided above the second disc 13, and the rotating component includes two rotating boxes 14 arranged above the second disc 13, and the two thin rods 11 both penetrate the rotating boxes 14, and the parts of the two thin rods 11 located in the rotating boxes 14 are fixedly connected to the second gear 36, and the rear inner walls of the two rotating boxes 14 are fixedly connected to the pneumatic rods 38, and the telescopic ends of the two pneumatic rods 38 are fixedly connected to the moving blocks 37, and the front sides of the two moving blocks 37 are provided with racks 35 that match the second gear 36, and the lower end of the second disc 13 is fixedly connected to the sensing block 39, and an infrared counting sensor 40 is installed at the inner bottom of the box body 1. The staff presets the counting trigger times of the infrared counting sensor 40. When the counting times reach the trigger times, an electrical signal is generated and transmitted to the controller, and the controller controls the pneumatic rod 38 to stretch or contract (depending on whether the pneumatic rod 38 is in a stretched state or a contracted state, thereby controlling the pneumatic rod 38 to stretch or contract), and the controller controls the counting times of the infrared counting sensor 40 to return to zero.
[0036] The functional principle of the present invention can be explained through the following operation mode: first, the automobile decoration is placed into the corresponding notch 20, and the automobile decoration is hung on the placement rack 12. At this time, the weight of the automobile decoration will squeeze the pressure sensor 21, so that the pressure sensor 21 will transmit an electrical signal to the controller, and the controller will control the circuit switches of the corresponding two electromagnets 25 to be turned on. Since the conductive rod 17 is in contact with the conductive block 15 on the left side at this time, the multiple electromagnets 25 on the front side are energized, so that the electromagnets 25 on the front side produce a repulsive force on the corresponding clamping blocks 23, so that the two clamping blocks 23 move relative to each other to clamp the automobile decoration;
[0037] At this time, the staff can wrap the metal material on the multiple electric heating rods 10, and then close the sliding door 5. Then the staff can control the operation of the negative pressure pump 2, so that the internal space of the box body 1 is in a vacuum state. At this time, the staff can start the drive motor 4 and control the multiple electric heating rods 10 to be energized, so that the multiple metal materials are heated and evaporated. At the same time, the operation of the drive motor 4 drives the first disc 6 and the second disc 13 to rotate, so that the thin rod 11 and the placement rack 12 drive the suspended automobile accessories to rotate, so that the evaporated metal material can condense on the automobile accessories to form a film;
[0038] When the driving motor 4 is running, the short rod drives the conductive rod 17 to rotate. When the conductive rod 17 contacts the conductive block 15 on the left, the multiple electromagnets 25 on the front side are all energized, so that the multiple clamping blocks 23 on the front side move toward the automobile decoration. When the conductive rod 17 contacts the conductive block 15 on the right side, the electromagnet 25 on the rear side is energized, and the electromagnet 25 on the front side is de-energized, so that the clamping block 23 on the rear side moves relatively, and the clamping block 23 on the front side is reset, so that different positions of the automobile decoration are alternately clamped, so that the clamped parts can also be plated.
[0039] During the rotation of the second disc 13, the induction block 39 will continuously pass over the infrared counting sensor 40. Each time the induction block 39 passes over the infrared counting sensor 40, the infrared counting sensor 40 will count once. When the infrared counting sensor 40 counts to a preset value, the infrared counting sensor 40 will generate an electrical signal to transmit to the controller. The controller controls the pneumatic rod 38 to contract, so that the moving block 37 drives the rack 35 to move, so that the second gear 36 drives the thin rod 11 to rotate, so that the other side of the suspended automobile decoration is close to the electric heating rod 10, so that the evaporated metal material on the electric heating rod 10 can be condensed on each side of the automobile decoration, thereby ensuring the quality of the coating of the automobile decoration;
[0040] When the controller controls the pneumatic rod 38 to retract, the controller will also control the infrared counting sensor 40 to reset to zero and recount. When the second disc 13 rotates again and recounts to a specified number of times, the controller will control the pneumatic rod 38 to extend, so that the thin rod 11 drives the automobile decoration to rotate.
[0041] During the operation of the driving motor 4, the first rotating rod 18 is driven to rotate through the first transmission component 16, and the rotation of the first rotating rod 18 drives the second rotating rod 33 to rotate through the second transmission component 34, so that the incomplete gear 32 rotates. When the incomplete gear 32 is engaged with the first gear 30, the first gear 30 drives the threaded sleeve 29 to rotate, so that the threaded rod 19 drives the rectangular plate 7, the vertical rod 9 and the multiple electric heating rods 10 to move upward. When the incomplete gear 32 is not engaged with the first gear 30, the threaded sleeve 29 rotates under the elastic action of the torsion spring 31, and then the threaded rod 19 drives the rectangular plate 7, the vertical rod 9 and the multiple electric heating rods 10 to move downward, so that the particles of the evaporated metal material can be distributed at different heights of the box 1, so that the metal particles can adhere to various positions of the automotive accessories more quickly, shortening the coating time of the automotive accessories and improving the efficiency of the processing of the automotive accessories;
[0042] When the coating of the automobile accessories reaches a certain time, the staff can turn off the drive motor 4, cut off the power of the multiple heating rods 10, open the sliding door 5, and lift the automobile accessories upwards. At this time, the pressure sensor 21 no longer generates an electrical signal, and the controller controls the circuit switches of the multiple electromagnets 25 to disconnect, thereby contacting the clamping of the automobile accessories, and the automobile accessories can be taken out.
[0043] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A vacuum coating device for automobile accessories, comprising a box (1), characterized in that: The front side of the box (1) is rotatably connected to a sliding door (5), and a rotating coating assembly is provided in the box (1), wherein the rotating coating assembly comprises a driving motor (4) mounted on the upper end of the box (1), the output shaft end of the driving motor (4) extends into the box (1) and is fixedly connected to a short rod, the lower end of the short rod is fixedly connected to a first disc (6), the lower end of the first disc (6) is rotatably connected to two thin rods (11), a plurality of placement racks (12) are provided on the two thin rods (11), a second disc (13) is provided at the lower end of the two thin rods (11), a circular opening (27) is provided on the second disc (13), and two rectangular plates (7) are provided in the box (1), the adjacent sides of the two rectangular plates (7) are commonly fixedly connected to a plurality of vertical rods (9), and an electric heating rod (10) is commonly fixedly connected between the adjacent sides of each two matching vertical rods (9); Each of the placement racks (12) is provided with a notch (20), and a pressure sensor (21) is installed at the inner bottom of each of the notches (20); a conductive rod (17) is fixedly connected to the outer wall of the short rod, and two conductive blocks (15) are fixedly connected to the inner top of the box body (1); The lifting assembly also includes a lifting assembly, which includes a threaded sleeve (29) arranged in the box body (1), the threaded sleeve (29) is rotatably connected to the inner bottom of the box body (1), the threaded sleeve (29) is elastically connected to the inner bottom of the box body (1) through a torsion spring (31), the threaded sleeve (29) is internally threadedly connected to a threaded rod (19), the upper end of the threaded rod (19) is fixedly connected to a rectangular plate (7) located below, the inner bottom of the box body (1) is fixedly connected to two telescopic rods (28), the telescopic ends of the two telescopic rods (28) are fixedly connected to the rectangular plate (7) located below, the inner bottom of the box body (1) is rotatably connected to a second rotating rod (33), and the second rotating rod (33) is provided with a non-retractable A complete gear (32), a first gear (30) is provided on the threaded sleeve (29), the inner top and the inner bottom of the box body (1) are connected to a first rotating rod (18) for common rotation, the first rotating rod (18) is connected to the short rod through a first transmission assembly (16), the first rotating rod (18) is connected to the second rotating rod (33) through a second transmission assembly (34), the first transmission assembly (16) includes a first sprocket arranged on the short rod and the first rotating rod (18), the two first sprockets are connected through a first chain, the second transmission assembly (34) includes a second sprocket arranged on the first rotating rod (18) and the second rotating rod (33), the two second sprockets are connected through a second chain.
2. The vacuum coating device for automobile accessories according to claim 1, characterized in that: Each of the placement racks (12) is provided with an anti-sway component, and the anti-sway component includes two rectangular blocks (22) fixedly connected to the lower end of the placement rack (12), and the adjacent sides of the two rectangular blocks (22) are provided with rectangular grooves, and the two rectangular grooves are slidably connected with clamping blocks (23), and each of the clamping blocks (23) is elastically connected to the inner wall of the corresponding rectangular groove through a spring (26), and an electromagnet (25) is embedded on the side of each rectangular groove away from the electric heating rod (10).
3. The vacuum coating device for automobile accessories according to claim 1, characterized in that: The lower end of the first disc (6) is fixedly connected to a guide rod (8), and the lower end of the guide rod (8) passes through the rectangular plate (7) located above and is fixedly connected to the limiting disc.
4. The vacuum coating device for automobile accessories according to claim 1, characterized in that: A rotating assembly is provided above the second disc (13), and the rotating assembly comprises two rotating boxes (14) arranged above the second disc (13); the two thin rods (11) both penetrate the rotating boxes (14); the parts of the two thin rods (11) located inside the rotating boxes (14) are fixedly connected to a second gear (36); the rear inner walls of the two rotating boxes (14) are fixedly connected to pneumatic rods (38); the telescopic ends of the two pneumatic rods (38) are fixedly connected to moving blocks (37); and the front sides of the two moving blocks (37) are provided with racks (35) that match the second gear (36).
5. The vacuum coating device for automobile accessories according to claim 4, characterized in that: The lower end of the second disc (13) is fixedly connected to a sensing block (39), and the inner bottom of the box body (1) is equipped with an infrared counting sensor (40).
6. The vacuum coating device for automobile accessories according to claim 4, characterized in that: A negative pressure pump (2) is installed on the left side of the box body (1), and the air inlet end of the negative pressure pump (2) is connected to the top space of the box body (1) through a connecting pipe (3).
Citation Information
Patent Citations
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