Anti-dripping quantitative filling device for pesticide filling

Abstract

The utility model relates to the technical field of pesticide packaging machines, and discloses an anti-dripping quantitative filling device for pesticide filling, which comprises a material box, a three-way control valve, an injection device and a filling head, the injection device comprises a cylinder barrel and a piston, the piston is slidably arranged in the cylinder barrel, one end of the piston is fixedly connected with a piston rod, and the other end of the piston is fixedly connected with the filling head. The piston rod extends out of one end of the cylinder barrel, the filling head is located below the liquid level in the material box, the three ends of the three-way control valve are communicated with the bottom end of the material box, the end, away from the piston rod, of the cylinder barrel and the filling head respectively, and the passive valve is arranged between the three-way control valve and the filling head and has opening pressure. In a natural state, the three-way control valve and the filling head are disconnected through the passive valve, and when the pressure of the side, close to the three-way control valve, of the passive valve is higher than the opening pressure, the three-way control valve and the filling head are communicated. The quantitative filling device can prevent materials from dripping and splashing in the filling process, and the quantitative precision is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of pesticide packaging machine technology, specifically to an anti-drip and splash quantitative filling device for pesticide filling. Background Technology

[0002] A liquid pesticide filling machine is a batch filling production equipment used to quantitatively fill liquid pesticides into packaging bottles. Existing liquid pesticide filling machines include a material tank, a three-way control valve, an injection device, and a filling head. The injection device includes a cylinder and a piston, with the piston slidably mounted inside the cylinder. A piston rod is fixedly connected to one end of the piston. The three ends of the three-way control valve are respectively connected to the bottom of the material tank, the top of the filling head, and the end of the cylinder furthest from the piston rod via pipelines. During operation, the injection device operates similarly to a syringe. First, the three-way control valve connects the material tank to the cylinder, and the piston rod moves the piston to quantitatively extract material from the material tank. Then, the three-way control valve connects the cylinder to the filling head, and the piston rod moves the piston in the opposite direction to expel the extracted material through the filling head, thus completing one filling cycle.

[0003] Existing pesticide filling machines consistently suffer from issues such as material splashing and inaccurate dosing during filling. In the pesticide packaging industry, splashing not only leads to material waste and environmental pollution, but also affects dosing accuracy as some material spills into the next bottle. Inaccurate dosing directly results in quality defects in the filled products. Avoiding material splashing and ensuring accurate dosing have become common technical challenges in the industry. The main reasons for these problems can be analyzed as follows:

[0004] Firstly, pesticide filling production is typically done in batches, requiring the feed hopper to have a large capacity and volume. Furthermore, to reduce the suction load on the injection unit, the feed hopper in existing liquid pesticide filling machines is usually positioned at the top or middle. This means that during operation, the liquid level in the feed hopper is often above the filling head. The three-way control valve achieves switching through valve core displacement, which requires a displacement time. During this displacement time, a certain amount of transient time occurs, causing the feed hopper to directly connect with the filling head. During this transient period, a small amount of material, under its own weight, flows from the feed hopper into the filling head and is then discharged, resulting in splashing.

[0005] Secondly, most existing liquid pesticide filling machines use cylinders to drive piston rods. The cylinder movement is not smooth enough, and impacts are easily generated inside the cylinder during operation. At the same time, the accuracy of cylinder stroke control is low, making it difficult to guarantee the quantitative accuracy of the injection device. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a drip-proof quantitative filling device for pesticide filling, which can prevent material dripping and ensure quantitative accuracy during filling.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] A drip-proof, splash-proof quantitative filling device for pesticide filling includes a hopper, a three-way control valve, an injection device, and a filling head. The injection device includes a cylinder and a piston. The piston is slidably disposed inside the cylinder, and a piston rod is fixedly connected to one end of the piston, extending beyond one end of the cylinder. The filling head is located below the liquid level in the hopper. The three ends of the three-way control valve are respectively connected to the bottom of the hopper, the end of the cylinder away from the piston rod, and the filling head. The device is characterized by further including a passive valve, which is disposed between the three-way control valve and the filling head. The passive valve has an opening pressure. In its natural state, the passive valve disconnects the three-way control valve from the filling head. When the pressure on the side of the passive valve closer to the three-way control valve is higher than the opening pressure, the three-way control valve connects to the filling head.

[0009] Specifically, the passive valve is a one-way valve, which is used to ensure that the material can only flow in one direction from the three-way control valve to the filling head.

[0010] Furthermore, it also includes a bracket, the cylinder is fixedly mounted on the bracket, a lead screw is rotatably mounted on the bracket, a push block is threadedly connected to the lead screw, and the push block is fixedly connected to the piston rod.

[0011] Furthermore, it also includes a servo motor, which is used to drive the lead screw to rotate.

[0012] Furthermore, a discharge pipe is connected to the end of the cylinder away from the piston rod, and a valve is installed on the discharge pipe.

[0013] The beneficial effects of this utility model are:

[0014] This anti-splash quantitative filling device for pesticide filling is an improved design based on existing filling devices. It adds a passive valve between the three-way control valve and the filling head of the existing filling device. This passive valve remains disconnected from the filling head under no-pressure or low-pressure conditions, effectively sealing off the three-way control valve during switching, preventing material splashing during filling, avoiding material waste and environmental pollution, and also preventing splashed material from affecting filling accuracy and ensuring product quality. During filling, the passive valve is opened by the piston rod and piston pushing the liquid in the cylinder, connecting the three-way control valve to the filling head without affecting normal filling. A screw motor and screw nut mechanism are also included to drive the piston rod, making its movement smoother and further ensuring quantitative accuracy during filling. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the anti-drip and splash quantitative filling device for pesticide filling according to this utility model;

[0016] In the diagram, 1-material bin, 2-three-way control valve, 3-filling head, 4-cylinder, 5-piston rod, 6-passive valve, 7-support, 8-lead screw, 9-push block, 10-servo motor, 11-discharge pipe, 12-valve. Detailed Implementation

[0017] The technical solution of this utility model is described in further detail below with reference to the accompanying drawings, but the scope of protection of this utility model is not limited to the following description.

[0018] like Figure 1 As shown, the anti-drip and splash quantitative filling device for pesticide filling is an improved design based on the existing filling device. The existing filling device includes a material tank 1, a three-way control valve 2, an injection device, and a filling head 3. The injection device includes a cylinder 4 and a piston. The piston is slidably disposed inside the cylinder 4. One end of the piston is fixedly connected to a piston rod 5, which extends out of one end of the cylinder 4. The filling head 3 is located below the liquid surface in the material tank 1. The three ends of the three-way control valve 2 are respectively connected to the bottom end of the material tank 1, the end of the cylinder 4 away from the piston rod 5, and the filling head 3. As mentioned above, it is similar to the principle of a syringe and can quantitatively fill materials by suction and extrusion.

[0019] Based on this, a passive valve 6 is also provided. The passive valve 6 is located between the three-way control valve 2 and the filling head 3. The passive valve 6 has an opening pressure. Under normal conditions, the passive valve 6 disconnects the three-way control valve 2 from the filling head 3. When the pressure on the side of the passive valve 6 closer to the three-way control valve 2 is higher than its opening pressure, the three-way control valve 2 and the filling head 3 are connected. By setting this passive valve 6, during use, although there is a transient period when the three-way control valve 2 switches directions, causing the material tank 1 to connect directly to the side of the passive valve 6 away from the filling head 3, this transient period is short. The liquid leaking from the valve core of the three-way control valve 2 is insufficient to build up pressure to open the passive valve 6. At this time, a blockage is formed at the passive valve 6, which can effectively prevent the material from dripping into the filling head 3. During the filling operation, the liquid in the cylinder is injected outward by the piston rod 5 and the piston. During this pushing process, the opening pressure can be overcome to open the passive valve 6, so that the material in the cylinder 4 flows into the filling head 3 through the passive valve 6 to achieve normal filling. Therefore, by adding passive valve 6, material splashing during filling can be eliminated, avoiding material waste and pollution of the production environment. At the same time, it also avoids the impact of splashed material on filling accuracy and ensures product quality.

[0020] In specific implementation, the aforementioned passive valve 6 can be a commercially available check valve. The installation direction of the check valve is to ensure that the material can only flow in one direction from the three-way control valve 2 to the filling head 3. Based on the structure of the check valve itself, when there is no liquid flow inside, the valve core is reset and closed under the action of the spring. Opening requires overcoming the elastic force of the spring, which just forms the aforementioned opening pressure. A conventional check valve can be used as the passive valve 6. It is easy to obtain and extremely convenient to modify existing filling machines.

[0021] Furthermore, it also includes a bracket 7, with the cylinder 4 fixedly mounted on the bracket 7. A lead screw 8 is rotatably mounted on the bracket 7, and a push block 9 is threadedly connected to the lead screw 8. The push block 9 is fixedly connected to the piston rod 5, forming a lead screw and nut mechanism. When the lead screw 8 rotates, the piston rod 5 and the piston can be driven to slide back and forth through the push block 9. The setting of this lead screw and nut mechanism makes the movement of the piston rod 5 more stable. Compared with the conventional cylinder drive method, it can reduce the impact of liquid flow in the cylinder 4 during operation, which is conducive to ensuring the stable operation of the passive valve 6.

[0022] Furthermore, it also includes a servo motor 10, which drives the lead screw 8 to rotate, so as to make the movement control of the piston rod 5 more accurate, thereby ensuring the accuracy of quantitative filling.

[0023] Furthermore, a discharge pipe 11 is connected to the end of the cylinder 4 away from the piston rod 5. A valve 12 is installed on the discharge pipe 11. When the machine is stopped, such as when changing the filling product, the valve 12 can be opened to discharge the residual material in the cylinder 4, so as to facilitate the cleaning of the cylinder 4.

[0024] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A drip-proof metering filling device for pesticide filling, comprising a tank, a three-way control valve, an injection device and a filling head, the injection device comprising a cylinder and a piston, the piston being slidably arranged in the cylinder, one end of the piston being fixedly connected with a piston rod, the piston rod extending out of one end of the cylinder, the filling head being located below the liquid level in the tank, three ends of the three-way control valve being respectively communicated with the bottom end of the tank, the end of the cylinder away from the piston rod and the filling head, characterized in that, The passive valve is arranged between the three-way control valve and the filling head, has an opening pressure, and disconnects the three-way control valve from the filling head in a natural state, and connects the three-way control valve with the filling head when the pressure on the side close to the three-way control valve is higher than the opening pressure.

2. The anti-dripping metering filling device for pesticide filling according to claim 1, characterized in that, The passive valve is a one-way valve, which is used to allow the material to flow only from the three-way control valve to the filling head.

3. The anti-dripping metering filling device for pesticide filling according to claim 1, characterized in that, The cylinder is fixedly arranged on a bracket, a screw rod is rotatably arranged on the bracket, a push block is threadedly connected to the screw rod, and the push block is fixedly connected with the piston rod.

4. The anti-dripping metering filling device for pesticide filling according to claim 3, characterized in that, A servo motor is arranged to drive the screw rod to rotate.

5. The anti-splash metering and filling device for pesticide filling according to claim 1, characterized in that, An exhaust pipe is further arranged at the end of the cylinder away from the piston rod, and a valve is arranged on the exhaust pipe.

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