Pneumatic injection filling valve

Abstract

The utility model discloses a pneumatic injection filling valve. The filling valve comprises an injection mechanism; the injection mechanism comprises a hollow piston rod, a sealing piston and an injection ball head which are connected in sequence; the hollow piston rod can be mounted in a cylinder barrel and can do telescopic motion in the cylinder barrel; the sealing piston and the injection ball head can be mounted in an injection head body and can do telescopic motion in the injection head body; the hollow piston rod is communicated with a middle through hole of the sealing piston to form a gas path channel, and an annular gap is formed between the injection ball head and the sealing piston, so that gas in the gas path channel flows out to purge the spherical surface of the injection ball. The problem of leakage in the filling process can be solved, participated materials are cleaned in time, equipment and follow-up materials are prevented from being polluted, waste of resources is avoided, and automatic application of the filling industry is met.

Description

Technical Field

[0001] The utility model relates to the technical field of filling, in particular to a pneumatic injection filling valve. Background Art

[0002] Filling valves are widely used in many industries such as daily necessities filling. Traditional filling valves are mainly composed of pneumatic valves and extended hollow filling rods. One end of the pneumatic valve is the material feed end, and the other end is connected to the filling rod. The drainage of the filling rod is directly facing the container mouth, and the precise filling of the material is achieved by controlling the opening and closing of the pneumatic valve. During the filling process, the residual material on the inner wall of the filling rod will cause the filling equipment to leak. The current mainstream valve heads in the industry have obvious leakage during use, and it is often necessary to add additional items such as basins and bowls to the automated equipment to deal with the dripping phenomenon. In order to solve the dripping problem, the prior art recovers the residual material into the material cavity to avoid dripping. Utility Model Content

[0003] Improving the problem of dripping of the filling valve by sucking back the residual material will have the following problems: on the one hand, if the sealing effect of the filling valve is not good, the residual material stored in the material chamber will still cause dripping; on the other hand, after the filling is completed, if the residual material remaining on the inner wall of the filling rod is not cleaned in time, it will pollute the equipment environment and the subsequent canned materials, which is not conducive to the cleaning of the equipment. At the same time, the recovered residual material will be discharged during the subsequent filling, resulting in a waste of resources. In short, when using the existing technology for filling, there will be problems such as material dripping, equipment and material pollution, resource waste and cleaning.

[0004] In view of the above problems, the present utility model is proposed to provide a pneumatic injection filling valve that overcomes the above problems or at least partially solves the above problems.

[0005] The embodiment of the utility model provides a pneumatic injection filling valve, comprising: an injection mechanism;

[0006] The injection mechanism comprises a hollow piston rod, a sealing piston and an injection ball head which are connected in sequence;

[0007] A hollow piston rod can be installed in a cylinder and can move telescopically in the cylinder;

[0008] The sealing piston and the injection ball head can be installed in an injection head body and can move telescopically in the injection head body;

[0009] The hollow piston rod and the middle through hole of the sealing piston are connected to form an air passage, and an annular gap is provided between the injection ball head and the sealing piston so that the gas in the air passage flows out to purge the spherical surface of the injection ball.

[0010] In some optional embodiments, the pneumatic injection filling valve further includes: a cylinder, an injection head body and a gas injection mechanism;

[0011] The cylinder barrel and the injection head body are detachably connected, and the injection head body has a hollow material cavity and is provided with a feed inlet and a discharge outlet;

[0012] The hollow piston rod is installed in the cylinder, and its outer end extends out of the cylinder to connect to the gas injection mechanism; its inner end extends out of the cylinder to extend into the injection head body;

[0013] The sealing piston and the injection ball head are installed in the injection head body.

[0014] In some optional embodiments, the hollow piston rod of the pneumatic injection filling valve can telescopically move in the cylinder;

[0015] The hollow piston rod extends, driving the sealing piston and the injection ball head to extend, so as to push out the material in the hollow cavity;

[0016] The hollow piston rod retracts, driving the sealing piston and the injection ball head to retract, so that the feed port is connected with the hollow material cavity.

[0017] In some optional embodiments, the cylinder of the pneumatic injection filling valve is provided with an extending air inlet and a retracting air inlet;

[0018] The piston on the hollow piston rod is located in the cylinder. Under the action of the intake airflow extending from the air inlet, the piston drives the hollow piston rod, the sealing piston and the injection ball head to extend to push out the material in the hollow material cavity; under the action of the intake airflow retracting from the air inlet, the piston drives the hollow piston rod, the sealing piston and the injection ball head to retract to connect the feed port with the hollow material cavity.

[0019] In some optional embodiments, a sealing assembly is provided at one end of the sealing piston of the pneumatic injection filling valve connected to the hollow piston rod, and the sealing assembly includes a clamping ring, a pan seal, a pan seal mounting sheet, and a pan seal spacer;

[0020] The pan-seal is arranged at intervals by a pan-seal spacer, and the pan-seal and the pan-seal spacer are nested and installed on the sealing piston;

[0021] The installation piece of the pan seal is nested with the sealing piston and installed on the outside of the pan seal;

[0022] The clamping ring is installed in the clamping ring installation groove on the sealing piston to limit the installation piece of the pan plug seal.

[0023] In some optional embodiments, the end of the sealing piston of the pneumatic injection filling valve connected to the injection ball head is provided with an outer chamfered portion, and the hollow material cavity of the injection head body is provided with an inner chamfered portion;

[0024] The outer chamfered portion cooperates with the inner chamfered portion to achieve sealing of the hollow material cavity.

[0025] In some optional embodiments, a ball head mounting hole is provided at one end of the sealing piston of the pneumatic injection filling valve connected to the injection ball head, and the injection ball head has a ball head mounting shaft, which can be fixedly mounted in the ball head mounting hole.

[0026] In some optional embodiments, the pneumatic injection filling valve is characterized in that the injection ball head includes a ball head mounting shaft and a ball head having a hemispherical curved surface;

[0027] The ball head mounting shaft is provided with a middle through hole and a plurality of air holes connected with the middle through hole; the plurality of air holes are evenly distributed around the circumference.

[0028] In some optional embodiments, the gas injection mechanism of the pneumatic injection filling valve includes an air pipe quick-connect connector, which is connected to an external air source; the gas injected from the external air source flows out through the air hole and flows along the hemispherical surface of the ball head to purge residual materials attached to the hemispherical surface.

[0029] In some optional embodiments, the pneumatic injection filling valve further comprises:

[0030] A cylinder installation transition block and a clamp connecting the cylinder barrel and the injection head body, the cylinder installation transition block is connected to the cylinder barrel, and the cylinder installation transition block is detachably connected to the injection head body through the clamp;

[0031] and / or

[0032] Reinforced connecting block between cylinder barrel and gas injection mechanism.

[0033] The beneficial effects of the above technical solution provided by the embodiment of the utility model at least include:

[0034] The pneumatic injection filling valve provided by the embodiment of the utility model is provided with an injection mechanism, which includes a hollow piston rod, a sealing piston and an injection ball head connected in sequence; the hollow piston rod can be installed in a cylinder and can telescopically move in the cylinder; when the hollow piston rod is extended, it can drive the sealing piston and the injection ball head to push out the material, and with the cooperation of the sealing piston and the inner wall of the injection head body, during the injection process, the material will not adhere to the inner wall of the injection head body, and when pushed out by the injection ball head, the material will only adhere to the surface of the ball head, thereby avoiding the dripping problem caused by the back-sucking of the material.

[0035] The middle through hole of the hollow piston rod and the sealing piston is connected to form an air passage, and there is an annular gap between the injection ball head and the sealing piston, so that the gas in the air passage can flow out to purge the spherical surface of the injection ball; for the residual material remaining on the surface of the ball head, the gas is injected into the tail by high-pressure gas, and the gas flows out through the air passage. Under the action of the wall effect, the direction of the gas is guided so that the gas flows along the spherical surface of the ball head to clean the surface of the ball head, and at the same time, it will not cause a large amount of material waste. During the injection process, gas is introduced into the hollow piston rod, and the gas is ejected from the annular gap. Under the dual stimulation of the high-pressure gas and the piston rod, the material forms a gas-liquid-solid three-phase mixture, which can also reduce the viscosity of the original solid-liquid two-phase mixture, which can effectively reduce material adhesion, reduce the waste of resources, and clean the equipment in time without causing pollution to the equipment and materials.

[0036] The sealing piston and the injection ball head can be installed in an injection head body and can move telescopically in the injection head body; the sealing piston and the injection head body fan surface are provided with chamfered parts, which can realize the close combination of the sealing piston and the injection head body, so that the sealing performance of the filling valve is better.

[0037] Other features and advantages of the utility model will be described in the subsequent description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings.

[0038] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0040] Figure 1 It is a schematic cross-sectional structure diagram of a pneumatic injection filling valve in an embodiment of the utility model;

[0041] Figure 2 It is a three-dimensional structural schematic diagram of a pneumatic injection filling valve in an embodiment of the utility model;

[0042] Figure 3 It is a schematic diagram of the retraction of the hollow piston rod in the embodiment of the utility model;

[0043] Figure 4 This is a specific structural example diagram of the sealing component in the embodiment of the utility model;

[0044] Figure 5This is a schematic diagram of the specific structure of the chamfered portion in the embodiment of the utility model;

[0045] Figure 6 The specific structural diagram of the injection ball head in the embodiment of the utility model is shown in FIG.

[0046] In the attached picture:

[0047] 1. Air pipe quick-connect connector; 2. Extend the air inlet; 3. Retract the air inlet; 4. Strengthen the connecting block; 6. Hollow piston rod; 7. Sealing piston; 8. Injection ball head; 9. Cylinder barrel; 10. Injection head body; 11. Pan seal; 12. Snap ring; 13. Pan seal mounting plate; 14. Pan seal spacer; 15. Cylinder mounting transition block; 16. Clamp; 17. Ball head mounting shaft. DETAILED DESCRIPTION

[0048] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0049] In order to solve the dripping problem, the existing filling valve adopts the method of sucking the remaining material back into the material chamber for storage after the filling work is completed. However, if the sealing effect of the filling valve is not good, this recycling method will still have leakage problems. In addition, storing the residual material in the material chamber will cause the equipment and materials to be contaminated, making the equipment difficult to clean.

[0050] In order to solve the problems of filling valve leakage and material and equipment pollution in the prior art, the present utility model provides a pneumatic injection filling valve, the structure of which is as follows: Figure 1 , Figure 2 , Figure 3 As shown, Figure 1 is a cross-sectional view of the filling valve. Figure 2 It is a three-dimensional structural schematic diagram of the canning valve. Figure 3 It is a cross-sectional view of the filling valve in a non-sealed state. The pneumatic injection filling valve includes: an injection mechanism.

[0051] The injection mechanism comprises a hollow piston rod 6, a sealing piston 7 and an injection ball head 8 which are connected in sequence;

[0052] The hollow piston rod 6 can be installed in a cylinder and can move telescopically in the cylinder;

[0053] The sealing piston 7 and the injection ball head 8 can be installed in an injection head body and can telescopically move in the injection head body;

[0054] The hollow piston rod 7 and the middle through hole of the sealing piston 6 are connected to form an air passage, and an annular gap is provided between the injection ball head 8 and the sealing piston 6 so that the gas in the air passage flows out to purge the spherical surface of the injection ball.

[0055] The injection mechanism can be designed as a component that can be removed from the valve body of the filling valve. The injection mechanism can be designed to be detachable as a whole, or a part of it can be designed to be detachable, such as the sealing piston 7 and the injection ball head 8 are designed to be detachable, and the hollow piston rod can directly use the piston rod of the double-head cylinder. Optionally, the pneumatic injection filling valve can also include: a cylinder 9, an injection head body 10 and an air injection mechanism;

[0056] The cylinder 9 and the injection head body 10 are detachably connected. The injection head body has a hollow material cavity and is provided with a feed port and a discharge port. The hollow piston rod 6 is installed in the cylinder 9, and its outer end extends out of the cylinder to connect to the gas injection mechanism; its inner end extends out of the cylinder and extends into the injection head body. The sealing piston 7 and the injection ball head 8 are installed in the injection head body 10.

[0057] The cylinder barrel 9 and the hollow piston rod 6 can form a cylinder part, and the injection head body 10, the sealing piston 7, and the injection ball head 8 can form a material injection part. The two parts can be connected by a cylinder installation transition block.

[0058] See also Figure 1 and Figure 2 As shown, the injection head body 10 includes two sections, one of which is in the shape of a straight cylinder, and the other end is in the shape of a bullet head. The internal hollow cavity is a through-hole structure that is connected as a whole. The feed port is set on the section shaped like a bullet head, and the discharge port is at one end of the hollow cavity. Figure 1 and Figure 2 The state is the sealing state, at this time, the injection ball head 8 is extended, the discharge port is sealed by the sealing piston 7, the sealing piston and the inner wall of the injection head body cooperate to form a closed structure, which improves the sealing performance of the filling valve.

[0059] Preferably, the hollow piston rod of the pneumatic injection filling valve can move telescopically in the cylinder;

[0060] The hollow piston rod extends, driving the sealing piston and the injection ball head to extend, so as to push out the material in the hollow cavity;

[0061] The hollow piston rod retracts, driving the sealing piston and the injection ball head to retract, so that the feed port is connected with the hollow material cavity.

[0062] Preferably, the cylinder of the pneumatic injection filling valve is provided with an extending air inlet 2 and a retracting air inlet 3;

[0063] A piston is provided in the middle of the hollow piston rod, and the piston is sealed with the cylinder barrel. The piston on the hollow piston rod is located in the cylinder barrel. Under the action of the intake airflow extending from the air inlet, the piston drives the hollow piston rod, the sealing piston and the injection ball head to extend to push out the material in the hollow material cavity; under the action of the intake airflow retracting the air inlet, the piston drives the hollow piston rod, the sealing piston and the injection ball head to retract to connect the feed port with the hollow material cavity.

[0064] Figure 1 This is a schematic diagram of the hollow piston rod extending out. When the material is to be injected, gas is injected into the extended air inlet, so that the piston drives the hollow piston rod to move, and the hollow piston rod drives the sealing piston and the injection ball head to push out the material in the material chamber. After the injection is completed, the sealing piston is in the material chamber, and the injection head extends out of the discharge port to complete the material sealing. The sealing piston and the inner wall of the injection head body cooperate to form a closed structure. Therefore, in the process of pushing out the material, no material will adhere to the inner wall of the injection head body, and only a small amount of material will adhere to the injection ball head. After the sealing is completed, there is no need to recover the material remaining on the surface of the injection ball head. Instead, the residual material on the surface of the ball head is purged by injecting high-pressure gas into the tail gas injection mechanism. Compared with the traditional back-suction method, this method is cleaner and avoids the dripping problem caused by the back-suction method. It will not contaminate subsequent materials and will not cause waste of resources.

[0065] Figure 3 This is a schematic diagram of the retraction of the hollow piston rod. When the feed port is to be fed, gas is injected into the retraction air inlet, so that the piston drives the hollow piston rod to move, and the hollow piston rod drives the sealing piston and the injection ball head to retract until the discharge port is completely exposed, facilitating the smooth entry of materials.

[0066] See also Figure 1 and Figure 3 As shown, the sealing piston is a columnar structure with a middle through hole, which can move in the hollow material cavity of the injection head body. The inner end of the sealing piston is provided with a piston rod connecting part connected to the hollow piston rod to connect the hollow piston rod.

[0067] Preferably, a sealing assembly is provided at one end of the sealing piston of the pneumatic injection filling valve connected to the hollow piston rod, and the sealing assembly includes a clamp ring 12, a flood seal 11, a flood seal mounting plate 13 and a flood seal spacer 14;

[0068] The pan-seal is arranged at intervals by a pan-seal spacer, and the pan-seal and the pan-seal spacer are nested and installed on the sealing piston;

[0069] The installation piece of the pan seal is nested with the sealing piston and installed on the outside of the pan seal;

[0070] The clamping ring is installed in the clamping ring installation groove on the sealing piston to limit the installation piece of the pan plug seal.

[0071] Figure 4 The specific structure of the sealing component is that the inner end of the sealing piston is designed as a step shaft structure and is provided with a snap ring mounting groove. The step shaft structure includes two step surfaces, on which a snap ring 12, a pan-seal mounting piece 13 and a pan-seal spacer 14 are installed in sequence. The pan-seal spacer is installed on the first step surface, and the second step surface includes one end of the pan-seal mounting piece and one end of the snap ring. The snap ring is used to limit the pan-seal mounting piece and the pan-seal spacer so that the position of the pan-seal mounting piece is fixed and does not move. One end of the pan-seal mounting piece is connected to the bayonet, and the other end is connected to the pan-seal spacer. The sealing component is installed in coordination to fix the sealing piston, so that the sealing effect of the sealing piston is better.

[0072] Preferably, the end of the sealing piston of the pneumatic injection filling valve connected to the injection ball head is provided with an outer chamfered portion, and the hollow material cavity of the injection head body is provided with an inner chamfered portion;

[0073] The outer chamfered portion cooperates with the inner chamfered portion to achieve sealing of the hollow material cavity.

[0074] Figure 5 For the specific structure of the chamfered part, see Figure 5 As shown, the end of the sealing piston connected to the ball head is provided with an outer chamfer, and the hollow material cavity of the injection head body is provided with an inner chamfer. The purpose of this design is that when sealing, under the action of the tail cylinder, the sealing piston and the cylinder body are tightly fitted to prevent a small amount of residual material from dripping, so that the sealing effect of the filling valve is better. Figure 5 It can be seen that there is an annular gap between the sealing piston and the injection ball head, which facilitates the outflow of gas. The chamfer angle should be reasonably designed according to the size of the workpiece. For example, in this embodiment, the chamfer can be designed to be 45°, which has a better sealing effect.

[0075] Preferably, the end of the sealing piston of the pneumatic injection filling valve connected to the injection ball head is provided with a ball head mounting hole, and the injection ball head has a ball head mounting shaft 17, and the ball head mounting shaft 17 can be fixedly mounted in the ball head mounting hole. The ball head mounting shaft and the ball head mounting hole can be connected in different ways, such as threaded connection, keyway connection, etc.

[0076] Preferably, the above-mentioned pneumatic injection filling valve, the injection ball head comprises a ball head mounting shaft and a ball head having a hemispherical curved surface;

[0077] The ball head mounting shaft has a middle through hole and a plurality of air holes connected to the middle through hole; the plurality of air holes are evenly distributed around the circumference. The number of air holes can be set as needed, and a gap between the air holes can be reserved at the position where the outer end of the sealing piston corresponds to the air hole. The ball head with a hemispherical curved surface includes a ball head bottom surface and a spherical surface, and an arc transition structure is designed at the connection between the ball head bottom surface and the spherical surface, so that the gas can be blown to the spherical surface more smoothly after flowing from the air hole to the annular gap.

[0078] Figure 6 For the specific structure of the injection ball head, see Figure 6 As shown, the ball head mounting shaft is a hollow structure with a middle through hole in the middle. One end of the ball head mounting head connected to the semicircular ball head has a plurality of circular air holes evenly distributed around the circumference. The air holes facilitate gas outflow to complete the task of cleaning residual materials.

[0079] Optionally, the inner wall of the outer end of the hollow material cavity of the injection head body is designed to be an arc structure that matches the spherical surface of the hemispherical curved ball head, so that the gas blown out from the air hole can be guided when blowing out along the annular gap between the ball head and the injection head body, thereby better blowing toward the spherical surface.

[0080] Preferably, the gas injection mechanism of the pneumatic injection filling valve comprises a trachea quick-connect connector 1, which is connected to an external gas source; the gas injected from the external gas source flows out through the gas hole and flows along the hemispherical surface of the ball head to purge the residual material attached to the hemispherical surface. Installing the trachea quick-connect connector can conveniently allow external gas to be injected into the middle through hole of the hollow piston rod, avoiding the problem of increased costs caused by gas waste.

[0081] When the piston rod moves in the direction of the retracted air inlet 3, the gas injection mechanism is started to introduce high-pressure gas into the tail trachea quick-connect fitting. The high-pressure gas reaches the air hole through the gas path and flows to the annular gap formed by the sealing piston and the injection ball head. Setting the trachea quick-connect fitting on the side will cause the equipment to be exposed, and the cleaning effect is not as good as the tail gas injection effect. Therefore, it is better to set the trachea quick-connect fitting at the tail than on the side. In the process of the hollow piston rod extending and pushing out the material, the material will form a gas-liquid-solid three-phase mixture under the dual impetus of high-pressure gas and piston. This will be lower than the viscosity of the original solid-liquid two-phase mixture, which can effectively reduce the adhesion of the material and eject it outward until it reaches the sealing state. The high-pressure gas flows out through the annular gap. Since the injection ball head is a curved surface structure, the gas will flow along the surface of the ball head under the action of the wall effect to blow away the residual material attached to the surface of the ball head.

[0082] Preferably, the pneumatic injection filling valve further comprises: a cylinder installation transition block 15 and a clamp 16 connecting the cylinder barrel 9 and the injection head body 10, the cylinder installation transition block is connected to the cylinder barrel, and the cylinder installation transition block is detachably connected to the injection head body through the clamp;

[0083] and / or

[0084] A reinforced connection block 4 connecting the cylinder barrel and the gas injection mechanism.

[0085] See also Figure 1 and Figure 2 As shown, the cylinder 9 and the injection head body 10 of the pneumatic injection filling valve are connected by a clamp, which facilitates the disassembly of the cylinder and the injection head body. Most of the existing filling valves cannot be disassembled, which is not conducive to the separate cleaning of the equipment. The cylinder and the injection head body are connected by a clamp, so that the two parts of the workpiece can be disassembled when necessary, which is conducive to the cleaning of the equipment. The purpose of setting the reinforced connection block is to better connect the external gas source and the central control piston rod. Other connection methods can also be used according to the actual working conditions to strengthen the connection between the external gas source and the hollow piston rod to ensure that the gas can smoothly enter the central control piston rod.

[0086] The actions that can be achieved by the above-mentioned pneumatic injection filling valve are described as follows:

[0087] Taking the cylinder barrel and the injection head body as the reference, the cylinder barrel and the injection head body are stationary;

[0088] The hollow piston rod 6 realizes telescopic movement under the action of the piston;

[0089] The sealing piston 7 and the injection ball head 8 are extended and retracted under the drive of the hollow piston rod 6;

[0090] According to the external air supply conditions, the above-mentioned pneumatic injection filling valve is based on the following actions to achieve joint actions:

[0091] Action 1: inject gas into the extended air inlet 2, and the hollow piston rod 6 extends;

[0092] Gas is injected into the extended air inlet 2, so that the piston drives the hollow piston rod 6 to extend, and the hollow piston rod 6 drives the sealing piston 7 and the injection ball head 8 to extend. When extending to the inner chamfered part of the injection head body 10, the outer chamfered part on the sealing piston 7 fits tightly with the inner chamfered part of the injection head body 10.

[0093] Action 2: inject gas into the retraction air inlet 3, and the hollow piston rod 6 retracts;

[0094] Gas is injected into the retraction air inlet 3, so that the piston drives the hollow piston rod 6 to retract, and the hollow piston rod 6 drives the sealing piston 7 and the injection ball head 8 to retract.

[0095] Action 3: Inject gas into the trachea quick-connect connector 1 to purge the residual material on the surface of the injection ball head;

[0096] Gas is injected into the air pipe quick-connect connector 1, and the gas moves in the air path formed by the middle through hole of the hollow piston rod 6 and the sealing piston 7, flows out from the annular gap between the sealing piston 7 and the injection ball head 8, and sweeps away the residual material on the surface of the ball head.

[0097] The pneumatic injection filling valve adopts a structure of a hollow piston rod, a sealing piston and an injection ball head. This structure will not suck back the material after filling. At the same time, by setting the inner and outer chamfers, the sealing effect of the filling valve is better. For the residual material remaining on the surface of the ball head after filling, the residual material on the surface of the ball head is purged by tail gas injection, avoiding the leakage of the filling valve and solving the problem of residual material contaminating the equipment. The filling valve has a clever structure, a smooth and coherent use process, good stability, and can meet the high-intensity automation requirements of the filling industry.

[0098] The cylinder barrel and the injection head body of the pneumatic injection filling are detachably connected, which is convenient for disassembly, storage and cleaning of the equipment and can ensure hygiene issues during the filling process.

[0099] The above-mentioned filling valve is used for filling daily necessities, and residual materials are cleaned by gas blowing during the filling process. It has been proved through repeated use experiments that compared with the traditional filling valve using material back suction, the filling valve does not produce any material dripping phenomenon, and there is no material residue after the injection ball head is blown.

[0100] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than those clearly stated in each claim. On the contrary, as reflected in the attached claims, the utility model is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the attached claims are hereby expressly incorporated into the detailed description, with each claim acting alone as a separate preferred embodiment of the utility model.

[0101] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A pneumatic injection filling valve, characterized in that: Including injection institutions; The injection mechanism comprises a hollow piston rod, a sealing piston and an injection ball head which are connected in sequence; The hollow piston rod can be installed in a cylinder and can move telescopically in the cylinder; The sealing piston and the injection ball head can be installed in an injection head body and can move telescopically in the injection head body; The middle through hole of the hollow piston rod and the sealing piston is connected to form an air passage, and an annular gap is provided between the injection ball head and the sealing piston so that the gas in the air passage flows out to purge the spherical surface of the injection ball.

2. The pneumatic injection filling valve according to claim 1, characterized in that: Also includes: Cylinder barrel, injection head body and gas injection mechanism; The cylinder barrel and the injection head body are detachably connected, and the injection head body has a hollow material cavity and is provided with a feed inlet and a discharge outlet; The hollow piston rod is installed in the cylinder, and its outer end extends out of the cylinder to connect to the gas injection mechanism; its inner end extends out of the cylinder to extend into the injection head body; The sealing piston and the injection ball head are installed in the injection head body.

3. The pneumatic injection filling valve according to claim 2, characterized in that: The hollow piston rod can move telescopically in the cylinder; The hollow piston rod extends, driving the sealing piston and the injection ball head to extend, so as to push out the material in the hollow material cavity; The hollow piston rod retracts, driving the sealing piston and the injection ball head to retract, so that the feed port is connected with the hollow material cavity.

4. The pneumatic injection filling valve according to claim 2, characterized in that: The cylinder is provided with an extending air inlet and a retracting air inlet; The piston on the hollow piston rod is located in the cylinder. Under the action of the intake airflow extending from the air inlet, the piston drives the hollow piston rod, the sealing piston and the injection ball head to extend to push out the material in the hollow material cavity; under the action of the intake airflow retracting the air inlet, the piston drives the hollow piston rod, the sealing piston and the injection ball head to retract to connect the feed port with the hollow material cavity.

5. The pneumatic injection filling valve according to claim 2, characterized in that: A sealing assembly is provided at one end of the sealing piston connected to the hollow piston rod, and the sealing assembly includes a clamping ring, a pan seal, a pan seal mounting sheet and a pan seal spacer; The pan-plug seal is arranged at intervals by a pan-plug seal spacer, and the pan-plug seal and the pan-plug seal spacer are nested and installed on the sealing piston; The pan-seal mounting piece is nested on the sealing piston and mounted on the outside of the pan-seal; The clamping ring is installed in the clamping ring installation groove on the sealing piston to limit the installation piece for the pan seal.

6. The pneumatic injection filling valve according to claim 2, characterized in that: An end of the sealing piston connected to the injection ball head is provided with an outer chamfered portion, and the hollow material cavity of the injection head body is provided with an inner chamfered portion; The outer chamfered portion cooperates with the inner chamfered portion to achieve sealing of the hollow material cavity.

7. The pneumatic injection filling valve according to claim 2, characterized in that: A ball head mounting hole is arranged at one end of the sealing piston connected to the injection ball head. The injection ball head has a ball head mounting shaft, and the ball head mounting shaft can be fixedly mounted in the ball head mounting hole.

8. The pneumatic injection filling valve according to claim 2, characterized in that: The injection ball head comprises a ball head mounting shaft and a ball head with a hemispherical curved surface; The ball head mounting shaft is provided with a middle through hole and a plurality of air holes connected with the middle through hole; the plurality of air holes are evenly distributed around the circumference.

9. The pneumatic injection filling valve according to claim 8, characterized in that: The gas injection mechanism includes a gas pipe quick-plug connector, which is connected to an external gas source; the gas injected from the external gas source flows out through the gas hole and flows along the hemispherical surface of the ball head to purge residual materials attached to the hemispherical surface.

10. The pneumatic injection filling valve according to claim 2, characterized in that: Also includes: A cylinder installation transition block and a clamp connecting the cylinder barrel and the injection head body, wherein the cylinder installation transition block is connected to the cylinder barrel, and the cylinder installation transition block is detachably connected to the injection head body through the clamp; and / or A reinforced connection block connecting the cylinder barrel and the gas injection mechanism.

Images