Negative pressure filling machine for perfume production

Abstract

The application discloses a negative pressure filling machine for perfume production and relates to the technical field of negative pressure filling machines.The negative pressure filling machine comprises a filling device, a centering device, a liquid supply device and a driving device.The driving device is used for pushing the filling head to drop to the bottle mouth.The liquid supply device is used for filling the perfume into the perfume bottle.The centering device is used for centering the perfume bottle and the filling head before filling, so that subsequent filling is facilitated.The filling device adopts a variable-diameter technology.In the process of filling the perfume under negative pressure, the diameter of the bottle mouth of the perfume bottle entering the working position is automatically detected through the setting of a recognition device.The recognition device drives the flared end of the filling head to be correspondingly adjusted in the radial direction, so that the opening size of the filling head can be self-adaptively matched with the diameter of the bottle mouth, the filling head does not need to be replaced for different specifications of bottle mouths, the compatible filling of various diameters of bottle mouths can be realized, and the production efficiency of the production line is improved.

Description

Technical Field

[0001] This invention relates to the field of negative pressure filling machine technology, specifically a negative pressure filling machine for perfume production. Background Technology

[0002] Perfume, as a highly volatile liquid product, is widely used in the daily chemical industry. Its production process has high requirements for filling accuracy, sealing performance and environmental control. It usually uses negative pressure filling, which creates a certain negative pressure in the container, allowing the liquid to enter the container under the action of pressure difference, thereby improving the stability and consistency of filling.

[0003] When filling perfumes, existing negative pressure filling machines usually require the selection of filling heads of appropriate specifications according to different filling needs. However, there is often a lack of versatility between different specifications of filling heads. When the production line needs to switch product types or change packaging specifications, the filling heads must be disassembled and replaced. This is not only cumbersome, but also takes up a lot of downtime, thus affecting the overall production efficiency. Summary of the Invention

[0004] The purpose of this invention is to solve the problem of replacing filling heads in the prior art, and to propose a negative pressure filling machine for perfume production.

[0005] To solve the above problems, the present invention provides the following technical solution: including a workbench, on which a filling device is installed, an alignment device is installed on one side of the filling device, and a liquid supply device is installed on one side of the alignment device; in use, the perfume bottle is placed on the alignment device, the alignment device automatically aligns the perfume bottle, the filling device descends to the mouth of the perfume bottle, and the liquid supply device fills the perfume into the perfume bottle.

[0006] The filling device includes a filling port and an anti-collision assembly. A liquid inlet cylinder is installed on one side of the anti-collision assembly. An inlet pipe and a return pipe are installed on the liquid inlet cylinder. The inlet pipe and the return pipe are connected to the liquid supply device through pipelines. The anti-collision assembly provides a buffer when the filling port contacts the bottle mouth, automatically adapts to the height error of the bottle mouth, and draws negative pressure into the perfume bottle through the return pipe. The perfume enters the perfume bottle through the inlet pipe, and excess perfume returns through the return pipe.

[0007] The filling port includes a housing, which is mounted on one side of the inlet cylinder. A recognition element is slidably installed inside the housing. A transmission element is mounted on one side of the recognition element, and a diameter-changing element is mounted on the other side of the transmission element. An air suction pipe is installed inside the diameter-changing element and is connected to the inlet cylinder. When the filling port descends, the recognition element first contacts the bottle mouth, driving the transmission element to move. The transmission element then drives the diameter-changing element to move, changing the diameter of the filling port according to the bottle mouth diameter, thus achieving an adaptive match between the opening size and the bottle mouth diameter.

[0008] The alignment device includes a support plate with a placement groove inside, and an alignment push rod circumferentially installed inside the placement groove. In use, the perfume bottle is placed into the placement groove, and the alignment push rod adjusts the position of the perfume bottle until it is aligned with the filling nozzle.

[0009] The identification element includes a sliding plate that slides inside the housing. A transmission element is mounted on the sliding plate. A conical block is mounted on one side of the sliding plate, and a first elastic element is mounted on the other side. One side of the first elastic element is mounted on the housing. The first elastic element includes a first spring. When the filling nozzle descends, the conical block contacts the mouth of the perfume bottle first. The smaller the diameter of the bottle mouth, the earlier the bottle mouth contacts the conical block. The bottle mouth drives the conical block to move closer to the liquid inlet cylinder. The conical block compresses the first spring, and simultaneously, the conical block drives the first connecting rod to move closer to the liquid inlet cylinder. When the filling nozzle descends a predetermined distance, the distance the conical block moves varies. The larger the bottle mouth diameter, the shorter the distance the conical block moves; the smaller the bottle mouth diameter, the longer the distance the conical block moves. A sealing gasket is provided on the surface of the conical block. When the conical block moves into position, it seals the bottle mouth, facilitating subsequent negative pressure filling.

[0010] The transmission element includes a middle ring mounted on the outer casing. A lever is rotatably mounted on the middle ring, and one end of the lever has a groove. A first connecting rod is mounted on a sliding plate, and a fulcrum is mounted on one side of the first connecting rod, sliding within the groove. A second connecting rod is rotatably mounted on the other end of the lever and is mounted on a reducing element. When the first connecting rod moves closer to the inlet cylinder, it causes the lever to rotate around the middle ring, and the lever causes the second connecting rod to move away from the inlet cylinder.

[0011] The reducing element includes a liquid inlet tube connected to the liquid inlet cylinder. A connecting tube is installed on one side of the liquid inlet tube, and a ring is slidably mounted on the connecting tube. A second connecting rod is mounted on the ring, and a third connecting rod is rotatably mounted on the ring. A flap is rotatably mounted on one side of the connecting tube, and an elastic sealing block is installed between the two flaps. One end of the third connecting rod rotates on the flap. When the second connecting rod moves away from the liquid inlet cylinder, it drives the ring to move away from the liquid inlet cylinder on the connecting tube. The ring drives the third connecting rod to rotate closer to the connecting tube, and the third connecting rod drives the flap to rotate closer to the connecting tube. The flap causes the elastic sealing block to contract. At this time, the filling channel area formed by all the flaps and the elastic sealing block becomes smaller, matching the diameter of the perfume bottle's mouth.

[0012] The anti-collision assembly includes a top cover, inside which a sliding post is slidably mounted. A liquid inlet cylinder is mounted on one side of the sliding post, and a second elastic element is sleeved on the outside of the sliding post. One end of the second elastic element is mounted on the top cover. The second elastic element includes a second spring. When there is an error in the height of the perfume bottle opening, the sliding post slides closer to the top cover inside the cover, at which point the second spring contracts.

[0013] The concentric push rod includes a guide rod that slides within a placement slot. A limit block is mounted on the guide rod, and a third elastic element is mounted on the limit block. The third elastic element is sleeved on the guide rod. A push block is mounted on one side of the guide rod, and one end of the push block has an arc-shaped surface. The third elastic element includes a third spring. When the perfume bottle is placed in the placement slot, the bottom of the perfume bottle contacts the arc-shaped surface of the push block. The bottom of the bottle pushes the push block to move away from the perfume bottle. The push block drives the guide rod to move away from the perfume bottle, compressing the limit block and the third spring. When the perfume bottle is in the placement slot, the four push blocks push the perfume bottle to adjust until the perfume bottle is coaxial with the conical block.

[0014] The liquid supply device includes a mounting frame mounted on a workbench. A first driving component is mounted on the mounting frame, and a liquid supply valve is mounted on one side of the first driving component. The liquid supply valve is connected to the inlet pipe and return pipe via pipelines. The first driving component is connected to the control system. A liquid supply bottle is mounted at one end of the liquid supply valve, and a vacuum generator is mounted at one end of the suction pipe. The vacuum generator is connected to the control system. When the second cylinder moves the filling device to the bottle mouth, a conical block seals the bottle mouth, activating the vacuum generator and the first cylinder. The vacuum generator creates negative pressure inside the perfume bottle through the suction pipe, causing the cylinder rod of the first cylinder to move and open the liquid supply valve. Perfume from the liquid supply bottle enters the inlet cylinder through the inlet pipe and flows out into the perfume bottle through the liquid passage pipe. When the perfume level in the perfume bottle completely seals the suction pipe, the pressure at the bottle neck increases, stopping the filling process. Liquid and air bubbles at the lower end of the suction pipe are drawn back into the return pipe along the pipe wall, preventing liquid from dripping onto the container or machine, thus completing the filling process.

[0015] The negative pressure filling machine also includes a drive unit, which consists of a lifting frame mounted on a worktable. A lifting plate is slidably mounted on the lifting frame, and a second drive component is mounted on the lifting plate. A fixed plate is mounted on the second drive component, and a top cover is mounted on the fixed plate. The second drive component is connected to the control system. A lead screw is rotatably mounted on the lifting frame, and a handwheel is mounted at one end of the lead screw. In use, the handwheel is manually turned, which drives the lead screw to rotate. The lead screw moves the lifting plate up and down until it reaches the predetermined position. At this point, the piston rod of the second cylinder retracts, causing the filling device to descend and fill the perfume bottles. After filling is complete, the piston rod of the second cylinder extends to reset the filling device.

[0016] The first driving component includes a first cylinder, and the second driving component includes a second cylinder.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention employs variable diameter technology. During the negative pressure filling process of perfume, an identification device is set up to automatically detect the diameter of the perfume bottle mouth entering the station. The identification device drives the flared end of the filling head to make corresponding radial adjustments, so that its opening size can adaptively match the bottle mouth diameter. There is no need to change the filling head for different bottle mouth sizes, which can achieve compatible filling for bottle mouths of various diameters, reduce equipment downtime for replacement and debugging, and improve the production efficiency of the production line. Attached Figure Description

[0018] Figure 1 This is a perspective view of the negative pressure filling machine of the present invention; Figure 2 This is a perspective view of the filling device of the present invention; Figure 3 This is a schematic diagram of the internal structure of the filling device of the present invention; Figure 4 This is a perspective view of the identification element of the present invention; Figure 5 This is a perspective view of the transmission element of the present invention; Figure 6 This is a perspective view of the variable diameter element of the present invention in its undeployed state; Figure 7 This is a perspective view of the centering push rod of the present invention; Figure 8 This is a perspective view of the liquid supply device and the driving device of the present invention.

[0019] In the diagram: 1. Filling device; 11. Filling port; 111. Outer shell; 112. Identification element; 1121. Sliding plate; 1122. Conical block; 1123. First elastic element; 113. Transmission element; 1131. Middle ring; 1132. First connecting rod; 1133. Lever; 1134. Second connecting rod; 114. Variable diameter element; 1141. Liquid passage pipe; 1142. Connecting pipe; 1143. Valve; 1144. Elastic sealing block; 1145. Circular ring; 1146. The first Three-link linkage; 115. Suction pipe; 12. Liquid inlet cylinder; 13. Anti-collision component; 131. Top cover; 132. Sliding column; 133. Second elastic element; 2. Centering device; 21. Placement slot; 22. Centering push rod; 221. Guide rod; 222. Limiting block; 223. Third elastic element; 224. Push block; 3. Liquid supply device; 31. Mounting bracket; 32. First driving component; 33. Liquid supply valve; 4. Driving device; 41. Lifting frame; 42. Lifting plate; 43. Second driving component. Detailed Implementation

[0020] The embodiments of the present invention will now be further described in conjunction with the accompanying drawings and examples.

[0021] Example: Figures 1-8As shown, the present invention provides a technical solution including a workbench, on which a filling device 1 is installed. A centering device 2 is installed on one side of the filling device 1, and a liquid supply device 3 is installed on one side of the centering device 2. In use, the perfume bottle is placed on the centering device 2, which automatically centers the perfume bottle. The filling device 1 descends to the mouth of the perfume bottle, and the liquid supply device 3 fills the perfume bottle with perfume.

[0022] The negative pressure filling machine also includes a drive unit 4, which includes a lifting frame 41 mounted on a workbench. A lifting plate 42 is slidably mounted on the lifting frame 41, and a second drive component 43 is mounted on the lifting plate 42. A fixing plate is mounted on the second drive component 43, and the top cover 131 is mounted on the fixing plate. The second drive component 43 is connected to the control system. A lead screw is rotatably mounted on the lifting frame 41, and a handwheel is mounted on one end of the lead screw. When in use, the handwheel is manually turned, which drives the lead screw to rotate. The lead screw drives the lifting plate 42 to move up and down until the lifting plate 42 moves to the predetermined position. The cylinder rod of the second cylinder is then retracted, and the cylinder rod drives the filling device 1 to descend. The filling device 1 fills the perfume bottle. After filling is completed, the cylinder rod of the second cylinder is extended to reset the filling device 1.

[0023] The liquid supply device 3 includes a mounting frame 31, which is mounted on a workbench. A first drive component 32 is mounted on the mounting frame 31. A liquid supply valve 33 is mounted on one side of the first drive component 32. The liquid supply valve 33 is connected to the inlet pipe and the return pipe through pipes. The first drive component 32 is connected to the control system. A liquid supply bottle is installed at one end of the liquid supply valve 33, and a vacuum generator is installed at one end of the suction pipe 115. The vacuum generator is connected to the control system. When the second cylinder drives the filling device 1 to the bottle mouth, the conical block 1122 seals the bottle mouth, controls the vacuum generator and the first cylinder to start. The vacuum generator draws negative pressure into the perfume bottle through the suction pipe 115. The cylinder rod of the first cylinder moves to open the liquid supply valve 33. The perfume in the liquid supply bottle enters the inlet cylinder 12 from the inlet pipe and flows out into the perfume bottle from the liquid passage pipe 1141. When the perfume liquid level in the perfume bottle seals the suction pipe 115, the air pressure at the neck increases, and filling stops. The liquid and air bubbles at the lower end of the suction pipe 115 are drawn back into the return pipe along the pipe wall of the suction pipe 115 to prevent the liquid from dripping onto the container or machine, thus completing the filling.

[0024] The filling device 1 includes a filling port 11 and an anti-collision component 13. An inlet cylinder 12 is installed on one side of the anti-collision component 13. An inlet pipe and a return pipe are installed on the inlet cylinder 12. The inlet pipe and the return pipe are connected to the liquid supply device 3 through pipes. The anti-collision component 13 provides a buffer when the filling port 11 contacts the bottle mouth, automatically adapts to the height error of the bottle mouth, and draws negative pressure into the perfume bottle through the return pipe. The perfume enters the perfume bottle through the inlet pipe, and the excess perfume returns through the return pipe.

[0025] The filling port 11 includes a housing 111, which is mounted on one side of the inlet cylinder 12. An identification element 112 is slidably installed inside the housing 111. A transmission element 113 is mounted on one side of the identification element 112, and a diameter-changing element 114 is mounted on one side of the transmission element 113. An air suction pipe 115 is installed inside the diameter-changing element 114 and communicates with the inlet cylinder 12. When the filling port 11 descends, the identification element 112 first contacts the bottle mouth, driving the transmission element 113 to move. The transmission element 113 then drives the diameter-changing element 114 to move. The diameter-changing element 114 changes the diameter of the filling port 11 according to the diameter of the bottle mouth, enabling its opening size to adaptively match the bottle mouth diameter.

[0026] The alignment device 2 includes a support plate with a placement groove 21 inside. An alignment push rod 22 is circumferentially installed inside the placement groove 21. In use, the perfume bottle is placed into the placement groove 21, and the alignment push rod 22 adjusts the position of the perfume bottle until the perfume bottle is aligned with the filling port 11.

[0027] The centering push rod 22 includes a guide rod 221, which slides within the placement groove 21. A limit block 222 is mounted on the guide rod 221, and a third elastic element 223 is mounted on the limit block 222. The third elastic element 223 is sleeved on the guide rod 221. A push block 224 is mounted on one side of the guide rod 221, and one end of the push block 224 has an arc-shaped surface. The third elastic element 223 includes a third spring. When the perfume bottle is placed in the placement groove 21, the bottom of the perfume bottle contacts the arc-shaped surface of the push block 224. The bottom of the bottle pushes the push block 224 to move away from the perfume bottle. The push block 224 drives the guide rod 221 to move away from the perfume bottle. The limit block 222 compresses the third spring. When the perfume bottle is located in the placement groove 21, the four push blocks 224 push the perfume bottle to adjust until the perfume bottle is coaxial with the conical block 1122.

[0028] The identification element 112 includes a sliding plate 1121 that slides inside the housing 111. A transmission element 113 is mounted on the sliding plate 1121. A conical block 1122 is mounted on one side of the sliding plate 1121, and a first elastic element 1123 is mounted on the other side of the sliding plate 1121. One side of the first elastic element 1123 is mounted on the housing 111. The first elastic element 1123 includes a first spring. When the filling port 11 descends, the conical block 1122 contacts the mouth of the perfume bottle first. The smaller the diameter of the bottle mouth, the earlier the bottle mouth contacts the conical block 1122. The bottle mouth drives the conical block 1122 to move closer to the liquid inlet cylinder 12. The conical block 1122 drives the first spring to compress. At the same time, the conical block 1122 drives the first connecting rod 1132 to move closer to the liquid inlet cylinder 12. When the filling port 11 descends a predetermined distance, the distance the conical block 1122 moves is different. The larger the diameter of the bottle mouth, the smaller the distance the conical block 1122 moves. The smaller the diameter of the bottle mouth, the larger the distance the conical block 1122 moves. The surface of the conical block 1122 is provided with a sealing gasket. When the conical block 1122 moves into place, the conical block 1122 seals the bottle mouth, which facilitates subsequent negative pressure filling.

[0029] The transmission element 113 includes a middle ring 1131, which is mounted on the outer casing 111. A lever 1133 is rotatably mounted on the middle ring 1131. One end of the lever 1133 has a groove. A first connecting rod 1132 is mounted on a sliding plate 1121. A fulcrum is mounted on one side of the first connecting rod 1132, and the fulcrum slides within the groove. A second connecting rod 1134 is rotatably mounted on the other end of the lever 1133 and is mounted on a variable diameter element 114. When the first connecting rod 1132 moves closer to the inlet cylinder 12, it drives the lever 1133 to rotate around the middle ring 1131. The lever 1133 then drives the second connecting rod 1134 to move away from the inlet cylinder 12.

[0030] The variable diameter element 114 includes a liquid inlet pipe 1141, which is connected to the liquid inlet cylinder 12. A connecting pipe 1142 is installed on one side of the liquid inlet pipe 1141. A ring 1145 is slidably installed on the connecting pipe 1142. A second connecting rod 1134 is installed on the ring 1145. A third connecting rod 1146 is rotatably installed on the ring 1145. A flap 1143 is rotatably installed on one side of the connecting pipe 1142. An elastic sealing block 1144 is installed between the two flaps 1143. One end of the third connecting rod 1146 rotates on the flap 1143. When the second connecting rod 1134 moves away from the liquid inlet cylinder 12, the second connecting rod 1134 drives the ring 1145 to move away from the liquid inlet cylinder 12 on the connecting pipe 1142. The ring 1145 drives the third connecting rod 1146 to rotate towards the connecting pipe 1142. The third connecting rod 1146 drives the flap 1143 to rotate towards the connecting pipe 1142. The flap 1143 drives the elastic sealing block 1144 to contract. At this time, the filling channel area formed by all the flaps 1143 and the elastic sealing block 1144 becomes smaller, which is compatible with the diameter of the perfume bottle mouth.

[0031] The anti-collision assembly 13 includes a top cover 131, a sliding post 132 slidably mounted inside the top cover 131, a liquid inlet cylinder 12 mounted on one side of the sliding post 132, and a second elastic element 133 sleeved on the outside of the sliding post 132. One end of the second elastic element 133 is mounted on the top cover 131. The second elastic element 133 includes a second spring. When there is an error in the height of the perfume bottle opening, the sliding post 132 slides closer to the top cover 131 inside the top cover, at which time the second spring contracts.

[0032] Working principle of the invention: When in use, the handwheel is manually turned, which drives the lead screw to rotate. The lead screw drives the lifting plate 42 to move up and down until the lifting plate 42 moves to the predetermined position. The perfume bottle is then placed into the placement slot 21. The bottom of the perfume bottle contacts the arc-shaped surface of the push block 224. The bottom of the bottle pushes the push block 224 to move away from the perfume bottle. The push block 224 drives the guide rod 221 to move away from the perfume bottle. The limit block 222 compresses the third spring. When the perfume bottle is in the placement slot 21, the four push blocks 224 push the perfume bottle to adjust until the perfume bottle is coaxial with the conical block 1122.

[0033] The piston rod of the second cylinder retracts, causing the filling port 11 to descend. The conical block 1122 of the filling port 11 contacts the mouth of the perfume bottle first. The smaller the diameter of the bottle mouth, the earlier the bottle mouth contacts the conical block 1122. The bottle mouth moves the conical block 1122 closer to the liquid inlet cylinder 12. The conical block 1122 compresses the first spring, and simultaneously moves the first connecting rod 1132 closer to the liquid inlet cylinder 12. The first connecting rod 1132 rotates the lever 1133 around the central ring 1131, and the lever 1133 moves the second connecting rod 1134 away from the liquid inlet cylinder 12. When the second connecting rod 1134 moves away from the liquid inlet cylinder 12, the second connecting rod 1134 drives the ring 1145 to move away from the liquid inlet cylinder 12 on the connecting pipe 1142. The ring 1145 drives the third connecting rod 1146 to rotate closer to the connecting pipe 1142. The third connecting rod 1146 drives the flap 1143 to rotate closer to the connecting pipe 1142. The flap 1143 drives the elastic sealing block 1144 to contract. At this time, the filling channel area formed by the flap 1143 and the elastic sealing block 1144 becomes smaller, which is compatible with the diameter of the perfume bottle opening.

[0034] When the filling port 11 descends a predetermined distance, the distance the conical block 1122 moves varies. The larger the bottle mouth diameter, the smaller the distance the conical block 1122 moves, and the smaller the bottle mouth diameter, the larger the distance the conical block 1122 moves. The surface of the conical block 1122 is provided with a sealing gasket. When the conical block 1122 moves into place, it seals the bottle mouth, facilitating subsequent negative pressure filling.

[0035] When the second cylinder moves the filling device 1 to the bottle mouth, the conical block 1122 seals the bottle mouth, controlling the vacuum generator and the first cylinder to start. The vacuum generator draws negative pressure into the perfume bottle through the suction pipe 115. The cylinder rod of the first cylinder moves to open the liquid supply valve 33. The perfume in the liquid supply bottle enters the liquid inlet cylinder 12 through the liquid inlet pipe and flows out into the perfume bottle through the liquid outlet pipe 1141. When the perfume liquid level in the perfume bottle seals the suction pipe 115, the air pressure at the neck increases, and filling stops. The liquid and air bubbles at the lower end of the suction pipe 115 are drawn back into the return pipe along the pipe wall of the suction pipe 115 to prevent the liquid from dripping onto the container or machine, thus completing the filling process.

[0036] The above description is merely a preferred embodiment of the present invention. Any modifications and / or equivalent substitutions and / or improvements made within the scope of the technical solutions claimed in the claims of this application should be included within the protection scope of the present invention. The protection scope of this application is determined by the technical solutions in the claims and their equivalents, and is not limited by the specific description in the specification.

Claims

1. A negative pressure filling machine for perfume production, characterized in that: Includes a workbench, on which a filling device (1) is installed, a centering device (2) is installed on one side of the filling device (1), and a liquid supply device (3) is installed on one side of the centering device (2). The filling device (1) includes a filling port (11) and an anti-collision component (13). An inlet cylinder (12) is installed on one side of the anti-collision component (13). An inlet pipe and a return pipe are installed on the inlet cylinder (12). The inlet pipe and the return pipe are connected to the liquid supply device (3) through pipes. The filling port (11) includes a shell (111), which is installed on one side of the liquid inlet cylinder (12). An identification element (112) is slidably installed inside the shell (111). A transmission element (113) is installed on one side of the identification element (112). A diameter-changing element (114) is installed on one side of the transmission element (113). An air suction pipe (115) is installed inside the diameter-changing element (114). The air suction pipe (115) is connected to the liquid inlet cylinder (12). The identification element (112) includes a sliding plate (1121) that slides inside the housing (111), a transmission element (113) that is mounted on the sliding plate (1121), a conical block (1122) that is mounted on one side of the sliding plate (1121), and a first elastic element (1123) that is mounted on the other side of the sliding plate (1121), with one side of the first elastic element (1123) mounted on the housing (111). The transmission element (113) includes a middle ring (1131), which is mounted on the outer shell (111). A lever (1133) is rotatably mounted on the middle ring (1131). One end of the lever (1133) is provided with a sliding groove. A first connecting rod (1132) is mounted on the sliding plate (1121). A fulcrum is mounted on one side of the first connecting rod (1132), and the fulcrum slides in the sliding groove. A second connecting rod (1134) is rotatably mounted on the other end of the lever (1133). The second connecting rod (1134) is mounted on the variable diameter element (114). The variable diameter element (114) includes a liquid inlet pipe (1141) which is connected to the liquid inlet cylinder (12). A connecting pipe (1142) is installed on one side of the liquid inlet pipe (1141). A ring (1145) is slidably installed on the connecting pipe (1142). A second connecting rod (1134) is installed on the ring (1145). A third connecting rod (1146) is rotatably installed on the ring (1145). A flap (1143) is rotatably installed on one side of the connecting pipe (1142). An elastic sealing block (1144) is installed between the two flaps (1143). One end of the third connecting rod (1146) rotates on the flap (1143).

2. The negative pressure filling machine for perfume production according to claim 1, characterized in that: The centering device (2) includes a support plate, and a placement groove (21) is provided in the support plate. A centering push rod (22) is installed circumferentially in the placement groove (21).

3. The negative pressure filling machine for perfume production according to claim 1, characterized in that: The anti-collision component (13) includes a top cover (131), a sliding column (132) is slidably installed inside the top cover (131), the liquid inlet cylinder (12) is installed on one side of the sliding column (132), and a second elastic element (133) is sleeved on the outside of the sliding column (132), with one end of the second elastic element (133) installed on the top cover (131).

4. A negative pressure filling machine for perfume production according to claim 2, characterized in that: The centering push rod (22) includes a guide rod (221), which slides in the placement groove (21). A limit block (222) is installed on the guide rod (221), and a third elastic element (223) is installed on the limit block (222). The third elastic element (223) is sleeved on the guide rod (221). A push block (224) is installed on one side of the guide rod (221), and one end of the push block (224) is an arc-shaped surface.

5. A negative pressure filling machine for perfume production according to claim 3, characterized in that: The liquid supply device (3) includes a mounting frame (31), which is mounted on a workbench. A first drive component (32) is mounted on the mounting frame (31). A liquid supply valve (33) is mounted on one side of the first drive component (32). The liquid supply valve (33) is connected to the inlet pipe and the return pipe through pipes. The first drive component (32) is connected to the control system.

6. A negative pressure filling machine for perfume production according to claim 5, characterized in that: The negative pressure filling machine also includes a drive device (4), which includes a lifting frame (41). The lifting frame (41) is installed on the workbench. A lifting plate (42) is slidably installed on the lifting frame (41). A second drive component (43) is installed on the lifting plate (42). A fixing plate is installed on the second drive component (43). The upper cover (131) is installed on the fixing plate. The second drive component (43) is connected to the control system.

7. A negative pressure filling machine for perfume production according to claim 6, characterized in that: The first drive member (32) includes a first cylinder, and the second drive member (43) includes a second cylinder.

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