Air cylinder capable of preventing valve needle from retreating

Abstract

The utility model discloses an air cylinder capable of preventing a valve needle from retreating, which relates to the technical field of air cylinders, and comprises a mechanism capable of preventing the valve needle from retreating, the mechanism capable of preventing the valve needle from retreating comprises a cylinder body, a piston main body and a spring, a movable cavity is arranged inside the cylinder body, and the inside of the movable cavity is in sliding connection with the piston main body; the spring is connected to one end of the piston body; the end of the cylinder body is connected with a cylinder cover, and a connecting assembly is arranged between the cylinder body and the cylinder cover. By arranging the mechanism for preventing the valve needle from retreating and adding the spring on the piston main body, when the air pressure is insufficient and the piston main body cannot reach the bottom, an elastic external force is applied to the piston main body through the pre-pressure of the spring, so that the piston main body can be pressed to reach the bottom, and the sealing state of the valve needle is maintained; according to the design, the mechanism for preventing the valve needle from retreating is arranged, so that the problem of retreating of the valve needle is solved, the stability and the reliability of the injection molding system are improved, and the cylinder cover and the cylinder body can be connected through the connecting assembly.

Description

Technical Field

[0001] This utility model relates to the field of cylinder technology, and in particular to a cylinder for preventing valve needle retraction. Background Technology

[0002] Currently, various types of cylinders are frequently used in the machinery industry. A cylinder is a cylindrical metal component that guides a piston to perform linear reciprocating motion within the cylinder. In an engine cylinder, air expands, converting thermal energy into mechanical energy; in a compressor cylinder, gas is compressed by the piston, increasing its pressure.

[0003] The cylinder block is the cavity in which the piston is housed. It is the piston's path, where the combustion gases burn and expand. Some of the residual heat from the combustion gases dissipates through the cylinder walls, maintaining the engine's normal operating temperature. Cylinders come in two types: integral and single-cast. Single-cast cylinders are further divided into dry and wet types. When the cylinder and cylinder block are cast as a single unit, it is called an integral cylinder; when the cylinder and cylinder block are cast separately, the single-cast cylinder barrel is called a cylinder liner. Cylinder liners that are in direct contact with cooling water are called wet cylinder liners; those that are not in direct contact with cooling water are called dry cylinder liners.

[0004] Cylinders are often used in existing injection molding systems to perform various actions and ensure the normal operation of the injection molding system. However, there is a significant problem with existing integrated cylinder technology: when the cylinder is in use, the piston will move back and forth inside the cylinder for a long time. During the continuous and repeated movement of the piston for a long time, the piston may not be able to reach the bottom. This will cause the valve needle to retract, resulting in a decrease in system stability and control accuracy. To address this, we propose a cylinder that prevents the valve needle from retracting. Utility Model Content

[0005] The purpose of this utility model is to provide a cylinder that prevents valve needle retraction. By setting an anti-valve needle retraction mechanism, the piston body and the spring can be used to press the piston body to the bottom under the pre-pressure given by the spring, thereby maintaining the sealing state of the valve needle and thus facilitating the maintenance of system stability and control accuracy.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cylinder for preventing valve needle retraction, comprising a valve needle retraction prevention mechanism, wherein the valve needle retraction prevention mechanism includes a cylinder body, a piston body, and a spring.

[0007] The cylinder body has a movable chamber inside, and the interior of the movable chamber is slidably connected to the piston body;

[0008] The spring is connected to one end of the piston body;

[0009] The cylinder block is connected to a cylinder head at one end, and a connecting component is provided between the cylinder block and the cylinder head.

[0010] Preferably, the connecting assembly includes a plurality of first screws threaded to one end of the cylinder head and a plurality of second screws threaded to the end face of the cylinder head, wherein the number of the first screws and the number of the second screws are both set to four.

[0011] Preferably, a Gladley ring is provided on the outer side of the piston body, and the Gladley ring is used to seal the gap between the piston body and the moving cavity.

[0012] Preferably, the cylinder body is further provided with a fixed sealing ring, and the other end of the piston body is provided with an internal retaining spring.

[0013] Preferably, a plug nut is threaded onto the outer surface of the cylinder, and a KY sealing ring is fixedly connected to the side of the piston body end.

[0014] The technical effects and advantages of this utility model are as follows:

[0015] By setting up a mechanism to prevent valve needle retraction, a spring is added to the piston body. When the piston body moves inside the moving chamber and the air pressure is insufficient, causing the piston body to fail to reach the bottom, the preload of the spring provides an elastic external force to the piston body, allowing it to reach the bottom and maintaining the valve needle's sealing state. This design, by setting up a mechanism to prevent valve needle retraction, not only solves the problem of valve needle retraction but also improves the stability and reliability of the injection molding system. Furthermore, the cylinder head and cylinder body can be connected using a connecting assembly. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the planar structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0018] In the diagram: 1. Glyd ring; 2. Fixed seal ring; 3. Inner snap ring; 4. KY seal ring; 5. Plug nut; 6. First screw; 7. Second screw; 8. Spring; 9. Piston body; 10. Cylinder block; 11. Cylinder head. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] This utility model provides, for example Figure 1-2The cylinder shown includes a valve needle retraction prevention mechanism, comprising a cylinder body 10, a piston body 9, and a spring 8. The cylinder body 10 has an internal movable chamber that is slidably connected to the piston body 9. The spring 8 is connected to one end of the piston body 9. A cylinder head 11 is connected to the end of the cylinder body 10, and a connecting assembly is provided between the cylinder body 10 and the cylinder head 11. By providing the valve needle retraction prevention mechanism and adding a spring 8 to the piston body 9, when the piston body 9 moves within the movable chamber and the air pressure is insufficient, preventing the piston body 9 from reaching the bottom, the preload of the spring 8 provides an elastic external force to the piston body 9, allowing it to reach the bottom and maintain the valve needle's sealing state. This design, by providing the valve needle retraction prevention mechanism, not only solves the valve needle retraction problem but also improves the stability and reliability of the injection molding system. Furthermore, the connecting assembly can be used to connect the cylinder head 11 to the cylinder body 10.

[0021] It should be noted that the connecting assembly includes a plurality of first screws 6 threaded to one end of the cylinder head 11 and a plurality of second screws 7 threaded to the end face of the cylinder head 11. The number of first screws 6 and the number of second screws 7 are both set to four. The cylinder head 11 and the cylinder block 10 are connected by the plurality of first screws 6 and the plurality of second screws 7.

[0022] It should be further explained that a Gladley ring 1 is provided on the outer side of the piston body 9, and the Gladley ring 1 is used to seal the gap between the piston body 9 and the moving cavity; by providing the Gladley ring 1, the piston body 9 can move easily and has a certain sealing effect, thereby avoiding leakage.

[0023] Furthermore, a fixed sealing ring 2 is provided inside the cylinder body 10, and an inner retaining spring 3 is provided at the other end of the piston body 9; by providing the fixed sealing ring 2, the cylinder body 10 is sealed, thereby preventing leakage.

[0024] It should be noted that the outer surface of the cylinder body 10 is threaded with a plug nut 5, and the piston body 9 is fixedly connected to the side of the end with a KY sealing ring 4. By setting the KY sealing ring 4, the piston body 9 can also have a good sealing effect under low pressure. At the same time, the plug nut 5 can also play a good sealing role, thereby avoiding leakage.

[0025] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A cylinder for preventing valve needle retraction, characterized in that, Includes a valve needle retraction prevention mechanism, which comprises a cylinder (10), a piston body (9), and a spring (8): The cylinder body (10) has a movable cavity inside, and the interior of the movable cavity is slidably connected to the piston body (9); The spring (8) is connected to one end of the piston body (9); The cylinder body (10) is connected to a cylinder head (11) at its end, and a connecting component is provided between the cylinder body (10) and the cylinder head (11).

2. A cylinder for preventing valve needle retraction according to claim 1, characterized in that, The connecting assembly includes a plurality of first screws (6) threaded to one end of the cylinder head (11) and a plurality of second screws (7) threaded to the end face of the cylinder head (11), wherein the number of the first screws (6) and the number of the second screws (7) are both set to four.

3. A cylinder for preventing valve needle retraction according to claim 1, characterized in that, A Gladley ring (1) is provided on the outer side of the piston body (9), and the Gladley ring (1) is used to seal the gap between the piston body (9) and the moving cavity.

4. A cylinder for preventing valve needle retraction according to claim 1, characterized in that, The cylinder body (10) is also provided with a fixed sealing ring (2), and the other end of the piston body (9) is provided with an inner retaining spring (3).

5. A cylinder for preventing valve needle retraction according to claim 1, characterized in that, The cylinder body (10) is threaded with a plug nut (5), and the piston body (9) is fixedly connected to the side of the end with a KY sealing ring (4).

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