A pull-type reflux injection valve

Abstract

This invention provides a pull-type reflux injection valve, relating to the field of injection equipment technology. This pull-type reflux injection valve includes a valve body. A pull rod is internally located at one end of the valve body. A pull handle is fixedly connected to the end of the pull rod away from the valve body. A cap tail seat is fixedly connected to the end of the valve body near the pull handle. A pin connecting block is fixedly connected to the end of the pull rod away from the pull handle. A return spring is slidably sleeved on the outer side of the pull rod between the cap tail seat and the pin connecting block. By replacing the pneumatic structure with a mechanical pull-type structure, the influence of the air source on control factors is avoided. Furthermore, the built-in return spring, replacing the pneumatic mechanism with a rigid mechanism, solves the gas compression problem of the pneumatic mechanism, preventing the injection stability of the injection valve from decreasing due to air source instability, and effectively improving the injection performance of the injection valve.

Description

Technical Field

[0001] This invention relates to the field of filling equipment technology, specifically a pull-type reflux injection valve. Background Technology

[0002] The injection valve of a fully automatic injection equipment is a crucial component determining whether liquid can flow through, and it is also the last control port between liquid injection products. Currently, the injection valves commonly found on injection equipment in the market are either pneumatic or electric. Because pneumatic injection valves are relatively simple and inexpensive, there are more types of injection equipment equipped with pneumatic devices than those with electric devices. Therefore, pneumatic control is the primary method, using the movement of cylinders to achieve quantitative control of the liquid, assisting operators in more accurately controlling the injection volume, and thus achieving precise and rapid control of the injection valve. The air source needs to ensure high purity and stability, placing higher demands on the drive equipment.

[0003] While existing pneumatic injection valves utilize the principle of cylinders to control the valve switching speed through pneumatic pressure to achieve liquid injection, the compressibility of gas means that the valve switching speed cannot be arbitrarily controlled. This can easily lead to problems affecting mechanical operation over long periods of time. Furthermore, since the pneumatic control chamber is tightly connected to the liquid injection chamber, and the ejector pin and piston are moving parts, they are typically sealed with rubber rings. Over time, wear and tear can cause liquid to enter the pneumatic control chamber from the side, damaging the injection valve body. Residual air pressure inside the control chamber of the injection valve can also cause gas to enter the injection chamber, easily resulting in leakage. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a pull-type reflux injection valve, which adopts a more stable mechanical pull-type structure, avoids gas source instability, improves the injection performance of the injection valve, and designs a reflux channel so that the liquid material can circulate internally in the injection cavity, thereby improving the liquid material leakage problem and solving the problems of gas source instability and liquid material leakage.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A pull-up reflux injection valve includes a valve body. A pull rod is internally located at one end of the valve body. A pull handle is fixedly connected to the end of the pull rod away from the valve body. A cap tail seat is fixedly connected to the end of the valve body near the pull handle. A pin connecting block is fixedly connected to the end of the pull rod away from the pull handle. A reciprocating spring is slidably sleeved on the outer side of the pull rod between the cap tail seat and the pin connecting block. An opening / closing pin is fixedly connected to the center of the end of the pin connecting block away from the pull rod. A locking plate is located at the end of the valve body away from the cap tail seat. The valve body is also equipped with equidistant... The valve body has multiple connecting posts. The end of the valve body away from the end cap is fixedly connected to an injection chamber via a locking plate and connecting posts. A clamping screw is threadedly connected to the center of the end of the injection chamber near the valve body. A sliding seal is provided inside the injection chamber near the connecting post. A pin seal is fixedly connected to the inner side of the outlet of the injection chamber away from the connecting post. An injection channel is opened on one side of the middle of the injection chamber. A return channel is opened on the side of the middle of the injection chamber away from the injection channel. The return channel is connected to the feed pipe of the injection channel via a pipe. A locking screw is fixedly connected to the outer side of the outlet of the injection chamber away from the connecting post.

[0006] Preferably, the end of the lifting rod away from the ejector pin connecting block passes through the cap tail seat and is slidably connected to the cap tail seat.

[0007] Preferably, the sliding seal is integrally embedded in the top inner side of the injection cavity, and the end of the clamping screw away from the pin connecting block is provided with a pressure ring, and the outer diameter of the pressure ring corresponds to the outer diameter of the sliding seal.

[0008] Preferably, the end of the opening / closing pin away from the pin connecting block passes through the pressing screw and the sliding seal, and is in a sealed sliding connection with the sliding seal.

[0009] Preferably, the injection channel and the return channel are located between the sliding seal and the ejector pin seal, and the injection channel and the return channel completely penetrate the internal cavity of the injection chamber.

[0010] Preferably, a material passage hole is provided at the center of the ejector pin seal, and the diameter of the material passage hole is smaller than the diameter of the rod of the opening and closing ejector pin.

[0011] Preferably, the center of the locking screw is provided with a discharge port corresponding to the material passage hole, and the outer side of the end of the locking screw away from the injection cavity is provided with a hexagonal screw end face.

[0012] Preferably, the valve body is a hollow structure with a square outer shape and a round inner shape, and the outer side of the injection cavity is a square or rectangular structure. Both the valve body and the injection cavity are made of aluminum alloy that has undergone anodizing treatment.

[0013] Preferably, both the sliding seal and the ejector pin seal are made of the latest PTFE material currently available on the market.

[0014] Preferably, transverse mounting screw holes are provided on both sides of the injection cavity at positions corresponding to the sliding seal.

[0015] The improvements of this invention are as follows: 1. By replacing the pneumatic structure with a mechanical lifting structure, this invention avoids the influence of the air source on control factors. Furthermore, by using a built-in return spring, the problem of gas compression in the pneumatic mechanism is solved by replacing it with a rigid mechanism. This avoids the problem of reduced injection stability of the injection valve due to air source instability. Utilizing the high control precision, fast response speed, and structural stability of the rigid mechanism, the injection performance of the injection valve is effectively improved. This achieves rapid and accurate control of the injection valve, stable injection structure, low cost, and strong mechanism compatibility, meeting the usage requirements under different working conditions according to actual injection needs; 2. This invention... By setting a return channel in the injection chamber, redundant space can be formed through the return channel, which can alleviate the internal pressure of the injection chamber. Furthermore, the sealing performance is effectively improved by squeezing the seal through the extrusion component, reducing the problem of liquid leakage. At the same time, the liquid is circulated, avoiding the phenomenon of particle sedimentation inside the injection pipeline. Moreover, the sealing structure between the injection chambers of the injection valve is adopted, which is easy to seal and has high durability. 3. Through innovative design in mechanical structure, this invention has a compact structure, is easy to install and operate. It is easy to deploy on a fully automatic injection station. All injection valves can be controlled by a single lifting mechanism, which further reduces the supporting cost of this structure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the front section structure of the present invention; Figure 2 This is a side sectional view of the present invention; Figure 3 This is a schematic diagram of the connection structure of the connecting column of the present invention.

[0017] Figure 4 This is a bottom view of the valve body structure of the present invention; Figure 5 This is a top view of the locking plate structure of the present invention.

[0018] Reference numerals: 1. Lifting handle; 2. Lifting rod; 3. Cover tail seat; 4. Valve body; 5. Ejector pin connecting block; 6. Locking plate; 7. Opening and closing ejector pin; 8. Connecting column; 9. Pressing screw; 10. Sliding seal; 11. Injection chamber; 12. Ejector pin seal; 13. Locking screw; 14. Reciprocating spring; 15. Injection channel; 16. Return channel. Detailed Implementation

[0019] The following description is merely a preferred embodiment of the present invention, and the scope of protection is not limited to this embodiment. All technical solutions falling within the scope of the present invention should be considered within the protection scope of the present invention. It should also be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the protection scope of the present invention. Example

[0020] like Figure 1-4 As shown, this embodiment of the invention provides a pull-up reflux injection valve, including a valve body 4. A pull rod 2 is internally disposed at one end of the valve body 4. A pull handle 1 is fixedly connected to the end of the pull rod 2 away from the valve body 4. A cap tail seat 3 is fixedly connected to the end of the valve body 4 near the pull handle 1. A pin connecting block 5 is fixedly connected to the end of the pull rod 2 away from the pull handle 1. The end of the pull rod 2 away from the pin connecting block 5 passes through the cap tail seat 3 and is slidably connected to it. A reciprocating spring 14 is slidably sleeved between the cap tail seat 3 and the pin connecting block 5 on the outer side of the pull rod 2. An opening / closing pin 7 is fixedly connected to the center of the end of the pin connecting block 5 away from the pull rod 2. A locking plate 6 is disposed at the end of the valve body 4 away from the cap tail seat 3. Four connecting posts 8 are diagonally and equidistantly disposed at the end of the valve body 4 away from the cap tail seat 3. The locking plate 6 is connected to the valve body 4 by screws at the top of two diagonally opposite connecting posts 8. The valve body 4 is fixedly connected, and the end of the valve body 4 away from the end cap 3 is fixedly connected to the injection chamber 11 through the locking plate 6 and the connecting column 8. The valve body 4 is a hollow structure with a square outer shape and a round inner shape, and the injection chamber 11 has a square rectangular structure on the outside. Both the valve body 4 and the injection chamber 11 are made of aluminum alloy that has been anodized. This invention avoids the influence of the air source on the control factors by changing the pneumatic structure to a mechanical lifting structure. By using the built-in return spring 14, the problem of gas compression of the pneumatic mechanism is solved by replacing it with a rigid mechanism. This avoids the problem of reduced injection stability of the injection valve due to the instability of the air source. By utilizing the characteristics of high control precision, fast response speed and structural stability of the rigid mechanism, the injection performance of the injection valve is effectively improved. It realizes fast and accurate control of the injection valve, stable injection structure, low cost and strong mechanism compatibility. According to the actual injection needs, it can meet the usage requirements under different working conditions.

[0021] A clamping screw 9 is threadedly connected to the center of the injection chamber 11 near the valve body 4. A sliding seal 10 is provided inside the injection chamber 11 near the connecting post 8. The sliding seal 10 is embedded in the top inner side of the injection chamber 11. A pressure ring is provided at the end of the clamping screw 9 away from the pin connecting block 5, and the outer diameter of the pressure ring corresponds to the outer diameter of the sliding seal 10. The end of the opening / closing pin 7 away from the pin connecting block 5 passes through the clamping screw 9 and the sliding seal 10, and is slidably connected to the sliding seal 10. A pin seal 12 is fixedly connected to the inner side of the outlet at the end of the injection chamber 11 away from the connecting post 8. Both the sliding seal 10 and the pin seal 12 are made of the latest PTFE material currently available on the market. The cavity 11 adopts a sealed structure between the cavities, which is easy to seal and has high durability. The center of the ejector pin seal 12 is provided with a material passage hole. The diameter of the material passage hole is smaller than the diameter of the rod of the opening and closing ejector pin 7. A locking screw 13 is fixedly connected to the outer side of the outlet of the injection cavity 11 away from the connecting column 8. The center of the locking screw 13 is provided with an outlet corresponding to the material passage hole. The outer side of the locking screw 13 away from the injection cavity 11 is provided with a hexagonal screw end face. The closing structure adopts a return spring 14 to press the opening and closing ejector pin 7 into the ejector pin seal 12 to close the material passage hole. The effective injection cross-sectional control area is minimized. The injection is closed and sealed immediately, effectively reducing the liquid material remaining in the outlet and solving the problems of dripping and injection stringing during movement.

[0022] An injection channel 15 is provided on one side of the middle of the injection chamber 11, and a return channel 16 is provided on the side of the middle of the injection chamber 11 away from the injection channel 15. The injection channel 15 and the return channel 16 are located between the sliding seal 10 and the ejector pin seal 12. The injection channel 15 and the return channel 16 completely penetrate the internal cavity of the injection chamber 11. The return channel 16 is connected to the feed pipe of the injection channel 15 through a pipe. Horizontal mounting screw holes are provided on both sides of the injection chamber 11 at positions corresponding to the sliding seal 10. By setting the return channel 16 in the injection chamber 11, the present invention can form redundant space through the return channel 16, relieve the internal pressure of the injection chamber 11, reduce the problem of liquid leakage, and at the same time allow the liquid to circulate, avoiding the phenomenon of particle sedimentation inside the injection pipeline.

[0023] Working principle: The injection valve consists of a valve body 4, a connecting column 8, and an injection chamber 11 connected vertically. The lifting rod 2 and the opening / closing pin 7 pass through the entire injection valve via the pin connecting block 5. The valve body 4 is separated from the connecting column 8 by a locking plate 6, which prevents liquid from seeping into the body chamber. The pin inside the body is fixed to the lifting rod 2. The opening / closing pin 7 is used to open and close the liquid injection. In particular, the closing structure uses a return spring 14 to press the opening / closing pin 7 into the pin seal 12 to close the material passage, minimizing the effective injection cross-sectional control area and closing the injection. Simultaneously, it immediately seals, effectively reducing the amount of liquid remaining inside the outlet and solving problems such as dripping and injection stringing during operation. The valve body is made of aluminum alloy with anodized hardening treatment, and the sealing parts are made of the latest PTFE material. All parts in contact with the liquid are made of corrosion-resistant materials. The injection valve is generally used in conjunction with a fully automatic injection station. Through innovative design in mechanical structure, it is compact, easy to install, and simple to operate. It is easy to deploy in a fully automatic injection station, and all injection valves can be controlled by a single lifting mechanism, further reducing the cost of this structure.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pull-out reflux injection valve, comprising a valve body (4), characterized in that: A lifting rod (2) is provided inside one end of the valve body (4). A lifting handle (1) is fixedly connected to the end of the lifting rod (2) away from the valve body (4). A cap tail seat (3) is fixedly connected to the end of the valve body (4) near the lifting handle (1). A pin connecting block (5) is fixedly connected to the end of the lifting rod (2) away from the lifting handle (1). A reciprocating spring (14) is slidably sleeved between the cap tail seat (3) and the pin connecting block (5) on the outside of the lifting rod (2). An opening and closing pin (7) is fixedly connected to the center of the end of the pin connecting block (5) away from the lifting rod (2). A locking plate (6) is provided at the end of the valve body (4) away from the cap tail seat (3). Multiple connecting posts (8) are equidistantly arranged at the end of the valve body (4) away from the cap tail seat (3). One end of the cap tail seat (3) is fixedly connected to an injection chamber (11) via a locking plate (6) and a connecting post (8). A pressing screw (9) is threadedly connected to the center of the injection chamber (11) near the valve body (4). A sliding seal (10) is provided inside the injection chamber (11) near the connecting post (8). A pin seal (12) is fixedly connected to the inner side of the outlet of the injection chamber (11) away from the connecting post (8). An injection channel (15) is opened on one side of the middle of the injection chamber (11). A return channel (16) is opened on the side of the middle of the injection chamber (11) away from the injection channel (15). The return channel (16) is connected to the feed pipe of the injection channel (15) via an external material pipe. A locking screw (13) is fixedly connected to the outer side of the outlet of the injection chamber (11) away from the connecting post (8).

2. The pull-out reflux injection valve according to claim 1, characterized in that: The end of the lifting rod (2) away from the pin connecting block (5) passes through the cap tail seat (3) and is slidably connected to the cap tail seat (3).

3. A pull-out reflux injection valve according to claim 1, characterized in that: The sliding seal (10) is embedded in the top inner side of the injection cavity (11). The end of the pressing screw (9) away from the pin connecting block (5) is provided with a pressing ring, and the outer diameter of the pressing ring corresponds to the outer diameter of the sliding seal (10).

4. A pull-out reflux injection valve according to claim 1, characterized in that: The end of the opening and closing pin (7) away from the pin connecting block (5) passes through the pressing screw (9) and the sliding seal (10) and is in a sealed sliding connection with the sliding seal (10).

5. A pull-out reflux injection valve according to claim 1, characterized in that: The injection channel (15) and the return channel (16) are located between the sliding seal (10) and the ejector pin seal (12), and the injection channel (15) and the return channel (16) completely penetrate the internal chamber of the injection cavity (11).

6. A pull-out reflux injection valve according to claim 1, characterized in that: The center of the ejector pin seal (12) has a material passage hole, the diameter of which is smaller than the diameter of the rod of the opening and closing ejector pin (7).

7. A pull-out reflux injection valve according to claim 6, characterized in that: The center of the locking screw (13) is provided with a discharge port corresponding to the material passage hole, and the outer side of the end of the locking screw (13) away from the injection cavity (11) is provided with a hexagonal screw end face.

8. A pull-out reflux injection valve according to claim 1, characterized in that: The valve body (4) is a hollow structure with a square outer shape and a round inner shape. The outer side of the injection cavity (11) is a square rectangular structure. The valve body (4) and the injection cavity (11) are both made of aluminum alloy that has been anodized.

9. A pull-out reflux injection valve according to claim 1, characterized in that: The sliding seal (10) and the pin seal (12) are both made of the latest PTFE material currently available on the market.

10. A pull-out reflux injection valve according to claim 1, characterized in that: The injection cavity (11) has transverse mounting screw holes on both sides at positions corresponding to the sliding seal (10).

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