Negative pressure filling machine with quantitative injection function

Abstract

The invention discloses a negative pressure filling machine with a quantitative injection function, and relates to the technical field of filling machines, the negative pressure filling machine with the quantitative injection function comprises a bottom plate, a vacuum pump and a negative pressure tank are mounted on the bottom plate, a filling head is mounted on the negative pressure tank, and an air exhaust hole and a liquid inlet hole are formed in the filling head; the end, away from the bottom plate, of the liquid inlet hole is provided with a liquid inlet pipe, the end, close to the bottom plate, of the liquid inlet hole is provided with a flow meter, the filling head is provided with an air inlet valve, the vacuum pump extracts air in the negative pressure tank to enable the air pressure in the negative pressure tank to be lower than the external air pressure, and liquid is pressed into the liquid inlet pipe by the external air pressure. When the flow meter installed at the end of the liquid inlet hole detects that the liquid inlet amount reaches a preset value, an electric signal can be sent out, the air inlet valve is controlled to be opened, the air pressure in the negative pressure tank and the external air pressure are balanced, liquid does not enter the negative pressure tank any more, quantitative liquid inlet of the negative pressure tank is achieved, the liquid inlet amount can be accurately controlled, and the filling quality can be improved.

Description

Technical Field

[0001] This invention relates to the field of filling machine technology, specifically a negative pressure filling machine with quantitative injection function. Background Technology

[0002] Negative pressure filling is a liquid filling technology that utilizes the principle of vacuum. By creating negative pressure (lower than atmospheric pressure) in the working chamber, a pressure difference is generated inside and outside the container, thereby quickly and accurately drawing the liquid into the container. It is suitable for volatile, high-viscosity, or gaseous liquids (such as alcohol, pharmaceuticals, and fruit juices). It can reduce oxidation and foaming, ensuring hygiene and stability. Its core equipment includes a vacuum pump, a sealing filling head, and a control system. It is widely used in the food, pharmaceutical, and cosmetic industries. Its characteristics include high efficiency, low loss, and leak-proof design, and it is especially suitable for small-diameter containers or high-requirement aseptic environments.

[0003] Quantitative feeding effectively reduces raw material waste, lowers production costs, and improves production efficiency and product qualification rates. In industries such as food, pharmaceuticals, and cosmetics, precise quantitative control can also prevent underfilling or overfilling, protect consumer rights, and comply with stringent industry standards.

[0004] Current technologies often do not focus on controlling the amount of material fed, but only on controlling the filling time. This control method has low precision and cannot effectively achieve quantitative feeding, which seriously affects the filling quality. Summary of the Invention

[0005] The purpose of this invention is to provide a negative pressure filling machine with quantitative injection function to solve the problems raised in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The negative pressure filling machine with quantitative injection function includes a base plate, on which a vacuum pump and two electric telescopic rods are installed. The two electric telescopic rods are connected through a filling head. A negative pressure tank is placed on the base plate. The negative pressure tank is coaxial with the filling head. The filling head has an air extraction hole and a liquid inlet hole. The air extraction hole and the vacuum pump are connected through an air extraction pipe. A liquid inlet pipe is installed on the end of the liquid inlet hole away from the base plate. A flow meter is installed on the end of the liquid inlet hole closer to the base plate. An air inlet valve is installed on the filling head.

[0007] As a preferred technical solution, the vacuum pump is electrically connected to the electric telescopic rod, and the flow meter is electrically connected to the inlet valve.

[0008] As a preferred technical solution, the filling head is equipped with a pressure stabilizing component and an adjusting component. The pressure stabilizing component works in conjunction with the vacuum pump to achieve staged filling, and the adjusting component adjusts the liquid inlet flow rate to ensure accurate filling.

[0009] As a preferred technical solution, the voltage stabilizing assembly includes a three-way valve, a voltage stabilizing pump, a detection hole, a mounting ring, a connecting spring, a sealing plate, a connecting rod, a coil, a mounting frame, a magnetic plate, and a rectifier;

[0010] The suction pipe and suction port are connected via a three-way valve. A pressure stabilizing pump is installed on the three-way valve. A detection hole is provided on the filling head. An installation ring is installed on the side of the detection hole near the base plate. A sealing plate is slidably installed inside the detection hole. The sealing plate and the installation ring are connected by a connecting spring. An installation frame is installed on the filling head. Each magnetic plate is symmetrically installed inside the installation frame. A connecting rod is installed on the sealing plate. A coil is installed at the upper end of the connecting rod. A rectifier is installed on the installation frame. The coil is connected to the rectifier. The rectifier is electrically connected to the pressure stabilizing pump.

[0011] As a preferred technical solution, the voltage stabilizing component further includes a first slide bar, a trigger block, a reset spring, a second slide bar, and a trigger switch;

[0012] A first slide rod is slidably installed inside the filling head. The mounting groove of the first slide rod is connected to the detection hole. A trigger block is installed at the end of the first slide rod away from the detection hole. The trigger block and the wall surface near the first slide rod are connected by a return spring. A second slide rod is slidably installed inside the filling head. The lower end of the second slide rod is in contact with the trigger block. A trigger switch is installed on the filling head. The trigger switch is located above the second slide rod.

[0013] As a preferred technical solution, the contact surface between the trigger block and the second slide rod is an inclined surface, and the trigger switch is electrically connected to both the vacuum pump and the pressure stabilizing pump.

[0014] As a preferred technical solution, the contact surface between the trigger block and the second slide rod is an inclined surface, and the trigger switch is electrically connected to both the vacuum pump and the pressure stabilizing pump.

[0015] As a preferred technical solution, an angle sensor is installed at one end of the rotating rod near the bevel gear. The angle sensor is used to detect the angle through which the rotating rod has rotated, and the angle sensor is electrically connected to the adjusting motor.

[0016] As a preferred technical solution, the adjustment assembly further includes a transmission rod, a rotating plate, and a current limiter;

[0017] A transmission rod is coaxially mounted on the output shaft of the regulating motor. A rotating plate is mounted on the end of the transmission rod. A flow limiter is mounted on the rotating plate. The diameter of the flow limiter is larger than the diameter of the liquid inlet. The vacuum pump is electrically connected to the regulating motor.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. By using a flow meter installed at the inlet to detect the liquid flow rate in real time, the liquid flow rate can be accurately controlled, thereby improving the filling quality.

[0020] 2. The electric telescopic rod is placed in the negative pressure tank to seal it, and then the vacuum pump is automatically controlled to work, which improves the automation level of filling and effectively improves filling efficiency.

[0021] 3. By controlling the increase or decrease of the air pressure in the negative pressure tank relative to the normal working state, the power of the pressure stabilizing pump is controlled in real time to maintain the air pressure in the negative pressure tank, that is, to maintain the stability of the liquid inlet speed. On the one hand, this prevents liquid from overflowing or getting out of control due to excessively fast liquid inlet, and on the other hand, it prevents liquid from affecting the filling efficiency due to excessively slow liquid inlet.

[0022] 4. By monitoring the air pressure inside the negative pressure tank in real time, the start and stop of the vacuum pump and the pressure stabilizing pump are controlled to achieve a smooth transition of the two-stage negative pressure pump, improve the degree of automation, and prevent large changes in air pressure inside the negative pressure tank from affecting the filling effect.

[0023] 5. Install flow restrictors and flow limiters to slow down the fluid flow rate and reduce the diameter of the inlet hole when the filling volume is about to be reached. This helps control the amount of liquid entering the fluid and further ensures the accuracy of the filling volume. When the filling volume is reached, the flow limiter will block the inlet hole in time to stop the liquid entering the fluid and prevent residual liquid from dripping due to gravity, thus further ensuring the filling quality. Attached Figure Description

[0024] Figure 1 This is a first-view structural diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of the second perspective structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the first cross-sectional structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the second cross-sectional structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the third cross-sectional structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the fourth cross-sectional structure of the present invention;

[0030] Figure 7 For the present invention Figure 3 Enlarged structural diagram at point A;

[0031] Figure 8 For the present invention Figure 4 Enlarged structural diagram at point B;

[0032] Figure 9For the present invention Figure 5 A magnified structural diagram at point C.

[0033] In the diagram: 1. Base plate; 2. Vacuum pump; 3. Electric telescopic rod; 4. Filling head; 5. Negative pressure tank; 6. Air extraction port; 7. Air extraction pipe; 8. Liquid inlet port; 9. Liquid inlet pipe; 10. Air inlet valve; 11. Flow meter;

[0034] 12. Voltage stabilizing assembly; 1201. Three-way valve; 1202. Voltage stabilizing pump; 1203. Detection hole; 1204. Mounting ring; 1205. Connecting spring; 1206. Sealing plate; 1207. Connecting rod; 1208. Coil; 1209. Mounting frame; 1210. Magnetic plate; 1211. Rectifier; 1212. First slide bar; 1213. Trigger block; 1214. Return spring; 1215. Second slide bar; 1216. Trigger switch;

[0035] 13. Adjustment assembly; 1301. Adjustment motor; 1302. Drive gear; 1303. Driven gear ring; 1304. Bevel gear ring; 1305. Rotating rod; 1306. Flow restrictor; 1307. Angle sensor; 1308. Transmission rod; 1309. Rotating plate; 1310. Flow limiter; 1311. Bevel gear. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example: Figures 1-6 As shown, the present invention provides a negative pressure filling machine with quantitative injection function, characterized in that: the negative pressure filling machine with quantitative injection function includes a base plate 1, a vacuum pump 2 and two electric telescopic rods 3 are installed on the base plate 1, the two electric telescopic rods 3 are connected through a filling head 4, a negative pressure tank 5 is placed on the base plate 1, the negative pressure tank 5 is coaxial with the filling head 4, the filling head 4 is provided with an air extraction hole 6 and a liquid inlet hole 8, the air extraction hole 6 and the vacuum pump 2 are connected through an air extraction pipe 7, a liquid inlet pipe 9 is installed on the end of the liquid inlet hole 8 away from the base plate, a flow meter 11 is installed on the end of the liquid inlet hole 8 near the base plate 1, and an air inlet valve 10 is installed on the filling head 4.

[0038] When filling the negative pressure tank 5, the vacuum pump 2 is started first. The vacuum pump 2 extracts the gas in the negative pressure tank 5 through the suction pipe 7 and the suction port 6, so that the gas pressure in the negative pressure tank 5 is lower than the external gas pressure. At this time, the filling liquid is forced into the liquid inlet pipe 9 by the external gas pressure, flows through the liquid inlet port 8 and the flow meter 11 into the negative pressure tank 5. When the flow meter 11 detects that the liquid inlet volume has reached the preset value, it will send an electrical signal to control the air inlet valve 10 to open, so that the gas pressure in the negative pressure tank 5 is balanced with the external gas pressure, and the liquid no longer enters, thus realizing the quantitative liquid inlet of the negative pressure tank 5. By detecting the liquid inlet volume in real time through the flow meter 11, the liquid inlet volume can be accurately controlled, which can improve the filling quality.

[0039] Vacuum pump 2 is electrically connected to electric telescopic rod 3, and flow meter 11 is electrically connected to inlet valve 10.

[0040] Before filling, the electric telescopic rod 3 is in the extended state, and an empty negative pressure tank 5 is placed on the base plate 1. Then, the electric telescopic rod 3 is controlled to retract at regular intervals so that the filling head 4 matches the negative pressure tank 5. After the electric telescopic rod 3 has retracted, it will send an electrical signal to control the vacuum pump 2 to start the evacuation operation. The electric telescopic rod 3 is placed in the negative pressure tank 5 and seals the negative pressure tank 5. Then, it autonomously controls the vacuum pump 2 to work, which improves the automation level of filling and effectively improves filling efficiency.

[0041] The filling head 4 is equipped with a pressure stabilizing component 12 and an adjusting component 13. The pressure stabilizing component 12 works in conjunction with the vacuum pump 2 to achieve staged filling, and the adjusting component 13 adjusts the liquid inlet flow rate to ensure accurate filling.

[0042] like Figures 1-8 As shown, the voltage stabilizing assembly 12 includes a three-way valve 1201, a voltage stabilizing pump 1202, a detection hole 1203, a mounting ring 1204, a connecting spring 1205, a sealing plate 1206, a connecting rod 1207, a coil 1208, a mounting frame 1209, a magnetic plate 1210, and a rectifier 1211;

[0043] The suction pipe 7 is connected to the suction port 6 via a three-way valve 1201. A pressure stabilizing pump 1202 is installed on the three-way valve 1201. A detection hole 1203 is opened on the filling head 4. An installation ring 1204 is installed on the side of the detection hole 1203 near the base plate 1. A sealing plate 1206 is slidably installed inside the detection hole 1203. The sealing plate 1206 and the installation ring 1204 are connected by a connecting spring 1205. An installation frame 1209 is installed on the filling head 4. Each magnetic plate 1210 is symmetrically installed inside the installation frame 1209. A connecting rod 1207 is installed on the sealing plate 1206. A coil 1208 is installed at the upper end of the connecting rod 1207. A rectifier 1211 is installed on the installation frame 1209. The coil 1208 is connected to the rectifier 1211. The rectifier 1211 is electrically connected to the pressure stabilizing pump 1202.

[0044] Initially, coil 1208 is entirely above magnetic plate 1210, and the magnetic flux within coil 1208 is zero. When vacuum pump 2 evacuates air, the air pressure inside negative pressure tank 5 is lower than the external air pressure, and sealing plate 1206 is pressed downwards. As sealing plate 1206 slides downwards, it drives coil 1208 to move downwards synchronously via connecting rod 1207. After evacuation, half of coil 1208 is located within the uniform magnetic field generated by magnetic plate 1210. Simultaneously, pressure stabilizing pump 1202 starts working. When the air pressure inside negative pressure tank 5 decreases, sealing plate 1206 moves downwards, increasing the magnetic flux through coil 1208. Coil 1208 generates a positive induced current, which is then rectified by rectifier 1211 to generate a positive electrical current. The pressure stabilizing pump 1202 is controlled to reduce its power to maintain stable air pressure in the negative pressure tank 5. When the air pressure in the negative pressure tank 5 increases, the sealing plate 1206 moves upward, reducing the magnetic flux through the coil 1208. The coil 1208 generates a reverse induced current, which is then rectified by the rectifier 1211 to generate a reverse electrical signal, controlling the pressure stabilizing pump 1202 to increase its power and maintain the air pressure in the tank. By controlling the increase or decrease of the air pressure in the negative pressure tank 5 relative to the normal operating state, the power of the pressure stabilizing pump 1202 is controlled in real time to maintain stable air pressure in the negative pressure tank 5, that is, to maintain a stable liquid inlet speed. This prevents liquid from overflowing or becoming uncontrolled due to excessively fast liquid inlet, and also prevents liquid from affecting filling efficiency due to excessively slow liquid inlet.

[0045] The voltage regulator assembly 12 also includes a first slide bar 1212, a trigger block 1213, a reset spring 1214, a second slide bar 1215, and a trigger switch 1216;

[0046] A first slide rod 1212 is slidably installed inside the filling head 4. The mounting groove of the first slide rod 1212 is connected to the detection hole 1203. A trigger block 1213 is installed at the end of the first slide rod 1212 away from the detection hole 1203. The trigger block 1213 is connected to the wall surface near the first slide rod 1212 by a return spring 1214. A second slide rod 1215 is slidably installed inside the filling head 4. The lower end of the second slide rod 1215 is in contact with the trigger block 1213. A trigger switch 1216 is installed on the filling head 4. The trigger switch 1216 is located above the second slide rod 1215.

[0047] The contact surface between the trigger block 1213 and the second slide bar 1215 is an inclined surface, and the trigger switch 1216 is electrically connected to both the vacuum pump 2 and the pressure stabilizing pump 1202.

[0048] In the initial state, the sealing plate 1206 is located above the first slide rod 1212. When the vacuum pump 2 starts working, the sealing plate 1206 moves down and exerts a squeezing force on the first slide rod 1212. The first slide rod 1212 pushes the trigger block 1213 to move away from the detection hole 1203. The movement of the trigger block 1213 will squeeze the second slide rod 1215 to move upward. When the first slide rod 1212 is completely squeezed into the slide groove, the upper end of the second slide rod 1215 contacts the trigger switch 1216, and the working air pressure is reached in the negative pressure tank 5. The trigger switch 1216 sends an electrical signal to stop the vacuum pump 2 and start the pressure stabilizing pump 1202. By detecting the air pressure in the negative pressure tank 5 in real time, the start and stop of the vacuum pump 2 and the pressure stabilizing pump 1202 are controlled to achieve a smooth transition of the two-stage negative pressure pump, improve the degree of automation, and prevent large changes in air pressure in the negative pressure tank 5 from affecting the filling effect.

[0049] like Figures 1-9 As shown, the adjustment assembly 13 includes an adjustment motor 1301, a drive gear 1302, a driven gear ring 1303, a bevel gear ring 1304, a rotating rod 1305, a flow restrictor 1306, an angle sensor 1307, and a bevel gear 1311.

[0050] An adjusting motor 1301 is installed inside the filling head 4. A drive gear 1302 is installed on the output shaft of the adjusting motor 1301. A driven gear ring 1303 is coaxially installed on the outside of the liquid inlet hole 8. The driven gear ring 1303 is rotatably installed inside the filling head 4 and meshes with the drive gear 1302. A bevel gear ring 1304 is installed on the driven gear ring 1303. Several rotating rods 1305 are rotatably installed on the wall of the liquid inlet hole 8. The rotating rods 1305 penetrate the wall of the liquid inlet hole 8. A bevel gear 1311 is installed at one end of the rotating rod 1305 outside the liquid inlet hole 8. The bevel gear 1311 meshes with the bevel gear ring 1304. A flow restrictor 1306 is installed at the other end of the rotating rod 1305.

[0051] The flow meter 11 has two preset thresholds: one for when the filling volume is about to be reached, and the other for when the filling volume is actually reached. The flow meter 11 will emit different electrical signals. The flow restrictor 1306 consists of rhomboid blocks with adjacent angles of different sizes. Initially, the two tips of the flow restrictor 1306 with smaller angles are in a vertical position, having almost no impact on the flow of the liquid. When the filling volume is about to be reached, the electrical signal emitted by the flow meter 11 will control the regulating motor 1301 to start. The output shaft of the regulating motor 1301 will drive the drive gear 1302 to rotate. The drive gear 1302 meshes with the driven gear ring 1303. The drive gear 1302 drives the bevel gear ring 1304 to rotate through the driven gear ring 1303. The bevel gear ring 1304 meshes with the bevel gear 1311. The bevel gear ring 1304 drives the flow obstructor 1306 to rotate through the bevel gear 1311 and the rotating rod 1305. The rotation of the flow obstructor 1306 increases the obstruction area of ​​the flow obstructor 1306 on the fluid, and the fluid velocity begins to decrease. The amount of fluid entering the negative pressure tank 5 per unit time decreases. When filling stops, the amount of liquid entering the negative pressure tank 5 instantaneously will decrease, making the control of the liquid inlet more precise, improving the accuracy of quantitative filling, and further improving the filling quality.

[0052] An angle sensor 1307 is installed at the end of one of the rotating rods 1305 near the bevel gear 1311. The angle sensor 1307 is used to detect the angle through which the rotating rod 1305 has rotated. The angle sensor 1307 is electrically connected to the adjusting motor 1301.

[0053] When the rotating rod 1305 drives the flow obstructor 1306 to rotate 90 degrees and 270 degrees, the flow obstruction effect of the flow obstructor 1306 is most obvious. When the flow obstructor 1306 rotates through 90 degrees, the angle sensor 1307 sends an electrical signal to control the regulating motor 1301 to stop running, thereby minimizing the fluid flow rate and improving accuracy.

[0054] The regulating assembly 13 also includes a transmission rod 1308, a rotating plate 1309, and a current limiter 1310;

[0055] A transmission rod 1308 is coaxially mounted on the output shaft of the regulating motor 1301. A rotating plate 1309 is mounted on the end of the transmission rod 1308. A flow limiter 1310 is mounted on the rotating plate 1309. The diameter of the flow limiter 1310 is larger than the diameter of the liquid inlet hole 8. The vacuum pump 2 is electrically connected to the regulating motor 1301.

[0056] When the regulating motor 1301 controls the flow restrictor 1306 to rotate, the output shaft of the regulating motor 1301 drives the transmission rod 1308 to rotate synchronously. The transmission rod 1308 drives the flow limiter 1310 to rotate via the rotating plate 1309. When the flow restrictor 1306 rotates 90 degrees, the flow limiter 1310 partially blocks the liquid inlet 8. When the filling volume threshold is reached, the electrical signal from the flow meter 11 controls the regulating motor 1301 to restart, and the regulating motor 1301 drives the flow limiter 1310 to fully rotate. When the liquid inlet hole 8 is blocked, the flow restrictor 1310 will reduce the diameter of the liquid inlet when it is about to reach the preset value, which helps to control the liquid inlet volume and further ensure the accuracy of the filling volume. When the filling volume is reached, the liquid inlet hole 8 will be closed in time to prevent residual liquid from dripping due to gravity, further ensuring the filling quality. When the vacuum pump 2 is started, the regulating motor 1301 rotates in the opposite direction, driving the flow restrictor 1306 to rotate 180 degrees and return to the initial angle. At this time, the flow restrictor 1310 will also unblock the liquid inlet hole 8 and return to the initial position.

[0057] Working principle of the invention:

[0058] When the flow meter 11 detects that the liquid inlet volume has reached the preset value, it will send an electrical signal to control the air inlet valve 10 to open, so that the air pressure inside the negative pressure tank 5 is balanced with the external air pressure, and no more liquid will enter, thus realizing the quantitative liquid inlet to the negative pressure tank 5. By detecting the liquid inlet volume in real time through the flow meter 11, the liquid inlet volume can be accurately controlled, which can improve the filling quality.

[0059] The electric telescopic rod 3 is placed in position in the negative pressure tank 5 to seal the negative pressure tank 5, and then the vacuum pump 2 is operated autonomously, which improves the automation level of filling and effectively improves filling efficiency.

[0060] By increasing or decreasing the air pressure inside the negative pressure tank 5 relative to the normal working state, the sealing plate 1206 drives the coil 1208 to move synchronously, changing the induced current through the coil 1208, and controlling the power of the pressure stabilizing pump 1202 in real time to maintain the air pressure inside the negative pressure tank 5, that is, to maintain the stability of the liquid inlet speed. On the one hand, this prevents liquid from overflowing or getting out of control due to excessively fast liquid inlet, and on the other hand, it prevents liquid from affecting the filling efficiency due to excessively slow liquid inlet.

[0061] By sliding the first slide rod 1212 on the wall of the detection hole 1203, when the working negative pressure is reached, the detection of the air pressure in the negative pressure tank 5 controls the start and stop of the vacuum pump 2 and the pressure stabilizing pump 1202, realizes the smooth transition of the secondary negative pressure pump, improves the degree of automation, and prevents large changes in the air pressure in the negative pressure tank 5 from affecting the filling effect.

[0062] The flow restrictor 1306 and the flow limiter 1310 are set up to slow down the flow rate of the fluid and the diameter of the inlet hole 8 when the filling volume is about to be reached, which helps to control the amount of liquid entering the fluid and further ensures the accuracy of the filling volume. When the filling volume is reached, the flow limiter 1310 will block the inlet hole 8 in time to stop the liquid entering the fluid and prevent residual liquid from dripping due to gravity, thus further ensuring the filling quality.

[0063] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A negative pressure filling machine with quantitative injection function, characterized in that: The negative pressure filling machine with quantitative injection function includes a base plate (1), on which a vacuum pump (2) and two electric telescopic rods (3) are installed. The two electric telescopic rods (3) are connected through a filling head (4). A negative pressure tank (5) is placed on the base plate (1). The negative pressure tank (5) is coaxial with the filling head (4). The filling head (4) is provided with an air extraction hole (6) and a liquid inlet hole (8). The air extraction hole (6) and the vacuum pump (2) are connected through an air extraction pipe (7). A liquid inlet pipe (9) is installed on the end of the liquid inlet hole (8) away from the base plate. A flow meter (11) is installed on the end of the liquid inlet hole (8) near the base plate (1). An air inlet valve (10) is installed on the filling head (4).

2. The negative pressure filling machine with quantitative injection function according to claim 1, characterized in that: The vacuum pump (2) is electrically connected to the electric telescopic rod (3), and the flow meter (11) is electrically connected to the air inlet valve (10).

3. A negative pressure filling machine with quantitative injection function according to claim 1, characterized in that: The filling head (4) is equipped with a pressure stabilizing component (12) and an adjusting component (13). The pressure stabilizing component (12) works in conjunction with the vacuum pump (2) to achieve graded filling. The adjusting component (13) adjusts the liquid inlet flow rate to ensure accurate filling.

4. A negative pressure filling machine with quantitative injection function according to claim 3, characterized in that: The voltage stabilizing assembly (12) includes a three-way valve (1201), a voltage stabilizing pump (1202), a detection hole (1203), a mounting ring (1204), a connecting spring (1205), a sealing plate (1206), a connecting rod (1207), a coil (1208), a mounting frame (1209), a magnetic plate (1210), and a rectifier (1211); The suction pipe (7) and the suction port (6) are connected by a three-way valve (1201). A pressure stabilizing pump (1202) is installed on the three-way valve (1201). A detection hole (1203) is provided on the filling head (4). An installation ring (1204) is installed on the side of the detection hole (1203) near the bottom plate (1). A sealing plate (1206) is slidably installed in the detection hole (1203). The sealing plate (1206) and the installation ring (1204) are connected by a connecting spring (1205). A mounting frame (1209) is installed on the filling head (4). Each magnetic plate (1210) is symmetrically installed in the mounting frame (1209). A connecting rod (1207) is installed on the sealing plate (1206). A coil (1208) is installed on the upper end of the connecting rod (1207). A rectifier (1211) is installed on the mounting frame (1209). The coil (1208) is connected to the rectifier (1211). The rectifier (1211) is electrically connected to the pressure stabilizing pump (1202).

5. A negative pressure filling machine with quantitative injection function according to claim 4, characterized in that: The voltage stabilizing assembly (12) also includes a first slide bar (1212), a trigger block (1213), a reset spring (1214), a second slide bar (1215), and a trigger switch (1216); A first slide rod (1212) is slidably installed inside the filling head (4). The mounting groove of the first slide rod (1212) is connected to the detection hole (1203). A trigger block (1213) is installed at the end of the first slide rod (1212) away from the detection hole (1203). The trigger block (1213) and the wall surface near the first slide rod (1212) are connected by a return spring (1214). A second slide rod (1215) is slidably installed inside the filling head (4). The lower end of the second slide rod (1215) is in contact with the trigger block (1213). A trigger switch (1216) is installed on the filling head (4). The trigger switch (1216) is located above the second slide rod (1215).

6. A negative pressure filling machine with quantitative injection function according to claim 4, characterized in that: The contact surface between the trigger block (1213) and the second slide bar (1215) is an inclined surface, and the trigger switch (1216) is electrically connected to both the vacuum pump (2) and the pressure stabilizing pump (1202).

7. A negative pressure filling machine with quantitative injection function according to claim 3, characterized in that: The adjustment assembly (13) includes an adjustment motor (1301), a drive gear (1302), a driven gear ring (1303), a bevel gear ring (1304), a rotating rod (1305), a flow restrictor (1306), an angle sensor (1307), and a bevel gear (1311); An adjusting motor (1301) is installed inside the filling head (4). A drive gear (1302) is installed on the output shaft of the adjusting motor (1301). A driven gear ring (1303) is coaxially installed on the outside of the liquid inlet (8). The driven gear ring (1303) is rotatably installed inside the filling head (4). The driven gear ring (1303) meshes with the drive gear (1302). A drive gear ring (1303) is mounted on the driven gear ring (1303). A bevel gear ring (1304) is provided, and several rotating rods (1305) are rotatably mounted on the wall of the liquid inlet (8). The rotating rods (1305) penetrate the wall of the liquid inlet (8). A bevel gear (1311) is installed at one end of the rotating rod (1305) outside the liquid inlet (8). The bevel gear (1311) meshes with the bevel gear ring (1304). A flow restrictor (1306) is installed at the other end of the rotating rod (1305).

8. A negative pressure filling machine with quantitative injection function according to claim 7, characterized in that: An angle sensor (1307) is installed at the end of one of the rotating rods (1305) near the bevel gear (1311). The angle sensor (1307) is used to detect the angle through which the rotating rod (1305) has rotated. The angle sensor (1307) is electrically connected to the adjusting motor (1301).

9. A negative pressure filling machine with quantitative injection function according to claim 7, characterized in that: The adjustment assembly (13) also includes a transmission rod (1308), a rotating plate (1309), and a flow limiter (1310); A transmission rod (1308) is coaxially mounted on the output shaft of the regulating motor (1301). A rotating plate (1309) is mounted on the end of the transmission rod (1308). A flow limiter (1310) is mounted on the rotating plate (1309). The diameter of the flow limiter (1310) is larger than the diameter of the liquid inlet (8). The vacuum pump (2) is electrically connected to the regulating motor (1301).

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