Double-spring self-locking normally-closed pneumatic pinch valve

Abstract

The invention discloses a double-spring self-locking normally-closed pneumatic pinch valve, which belongs to the field of pneumatic pinch valves, and comprises a valve body, a cover plate, a screw, a rubber neck bush, a spring sheath, an air cylinder piston connecting rod, a movable plate base, an air cylinder, an air tap, a spring, a lower pressing rod connecting rod, an upper pressing rod guide sleeve, an upper pressing rod, a lower pressing rod and a fixing frame. By designing the double-spring structure, the two ends of the pressing rod are evenly stressed, and pressure is evenly applied. Springs are designed to be dispersed on the two sides of the air cylinder, the overall size of the valve body is not increased, and standard performance is improved. The designed rectangular (cross-section) spring is longer in service life than a round (cross-section) spring, and is more durable. The clamping device is installed in a floating mode, centering bidirectional symmetrical extrusion of the neck bush is guaranteed, rubber stress is symmetrically distributed, and the service life is prolonged to the maximum extent.

Description

Technical Field

[0001] This invention relates to the field of pneumatic pinch valves, and in particular to a double-spring self-locking normally closed pneumatic pinch valve. Background Technology

[0002] Traditional normally closed pinch valves utilize a single-acting pneumatic actuator to achieve their normally closed, self-locking function. A thrust spring is installed inside or outside the cylinder; the spring's thrust keeps the pinch valve closed. When compressed air is input into the cylinder, it overcomes the spring's thrust, opening the pinch valve. This design suffers from the following problems: 1. The lateral pressure rod experiences force at a single point, making it impossible to ensure uniform pressure on the rubber hose, thus compromising the reliability of the closure. 2. Because the thrust is concentrated on a single spring, the pinch valve is bulky and heavy, subject to space constraints in installation environments. 3. The lifespan of the standard spring in a single-acting pneumatic actuator is insufficient for the long-term, high-frequency switching operation of the pinch valve. Therefore, a double-spring self-locking normally closed pneumatic pinch valve needs to be designed. Summary of the Invention

[0003] The purpose of this invention is to solve the problems mentioned in the background art by designing a double-spring self-locking normally closed pneumatic pinch valve.

[0004] The technical solution of the present invention to achieve the above objectives is as follows: a double-spring self-locking normally closed pneumatic pinch valve, comprising a valve body, a cover plate, screws, a rubber inner sleeve, a spring sleeve, a cylinder piston connecting rod, a moving plate base, a cylinder, a nozzle, a spring, a lower pressure rod connecting rod, an upper pressure rod guide sleeve, an upper pressure rod, a lower pressure rod, and a fixing frame. The valve body is fixedly connected to the upper and lower ends of the cover plate. The valve body consists of two parts, fixedly connected in the middle by screws on both sides. A rubber inner sleeve is fitted in the center of the valve body. Spring sleeves are fixedly connected to the left and right ends of the upper cover plate. A cylinder piston connecting rod is fixedly connected between the two spring sleeves. A cylinder is fixedly connected above the piston connecting rod. The cylinder is placed above the moving plate base. An air nozzle is fixedly connected to one side of the cylinder. Springs are fixedly connected inside the two spring sleeves. A lower pressure rod connecting rod is fixedly connected in the middle of each spring. An upper pressure rod guide sleeve is slidably connected to the lower pressure rod connecting rod below each spring. An upper pressure rod is fixedly connected in the middle of the two pressure rod guide sleeves. A lower pressure rod is welded to the two lower pressure rod connecting rods with a circular tube below the upper pressure rod. A fixing bracket is fixedly connected to one side of the upper pressure rod and the lower pressure rod. A rubber inner liner is fixedly connected in the middle of the two fixing brackets.

[0005] Preferably, the rubber inner liner is floatingly installed between the upper pressure rod and the lower pressure rod.

[0006] Preferably, the two springs are rectangular (section) springs.

[0007] Preferably, the upper and lower cover plates and the valve body are an integral unit.

[0008] Beneficial effects:

[0009] This invention provides a double-spring self-locking normally closed pneumatic pinch valve, which has the following advantages: The device utilizes a double-spring structure to ensure uniform force distribution at both ends of the pressure rod, resulting in even pressure application. The springs are distributed on both sides of the cylinder, without increasing the valve body's overall dimensions, thus improving standardization. The rectangular (section) springs have a longer lifespan than circular (section) springs, making them more durable. The floating installation with a clamping device ensures symmetrical bidirectional compression of the inner bushing, resulting in symmetrical force distribution on the rubber and maximizing its service life. Attached Figure Description

[0010] Figure 1 This is a front structural schematic diagram of a double-spring self-locking normally closed pneumatic pinch valve according to the present invention;

[0011] Figure 2 This is a schematic diagram of the back structure of a double-spring self-locking normally closed pneumatic pinch valve according to the present invention;

[0012] Figure 3 This is a schematic diagram of the internal structure of a double-spring self-locking normally closed pneumatic pinch valve according to the present invention.

[0013] In the diagram, 1. Valve body; 2. Cover plate; 3. Screw; 4. Rubber inner sleeve; 5. Spring sleeve; 6. Cylinder piston connecting rod; 7. Moving plate base; 8. Cylinder; 9. Air nozzle; 10. Spring; 11. Lower pressure rod connecting rod; 12. Upper pressure rod guide sleeve; 13. Upper pressure rod; 14. Lower pressure rod; 15. Fixing bracket. Detailed Implementation

[0014] 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.

[0015] In the description of this invention, it should be noted that the terms "upper / lower end," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "set / sleeved," "sleeved," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0017] Please see Figure 1-3 This invention provides a double-spring self-locking normally closed pneumatic pinch valve, comprising a valve body 1, a cover plate 2, screws 3, a rubber inner sleeve 4, a spring sleeve 5, a cylinder piston connecting rod 6, a moving plate base 7, a cylinder 8, an air nozzle 9, a spring 10, a lower pressure rod connecting rod 11, an upper pressure rod guide sleeve 12, an upper pressure rod 13, a lower pressure rod 14, and a fixing bracket 15. The valve body 1 is fixedly connected to the upper and lower ends of the cover plate 2. The valve body 1 consists of two parts, fixedly connected in the middle by screws 3 on both sides. A rubber inner sleeve 4 is fitted in the middle of the valve body 1. Spring sleeves 5 are fixedly connected to the left and right ends of the upper cover plate 2. A cylinder piston connecting rod 6 is fixedly connected between the two spring sleeves 5. A cylinder 8 is fixedly connected to the top, and the cylinder 8 is placed above the moving plate base 7. An air nozzle 9 is fixedly connected to one side of the cylinder 8. A spring 10 is fixedly connected inside each of the two spring sleeves 5. A lower pressure rod connecting rod 11 is fixedly connected in the middle of each spring 10. An upper pressure rod guide sleeve 12 is slidably connected to the lower pressure rod connecting rod 11 below each spring 10. An upper pressure rod 13 is fixedly connected in the middle of the two pressure rod guide sleeves 12. A lower pressure rod 14 is welded to the two lower pressure rod connecting rods 11 below the upper pressure rod 13. A fixing bracket 15 is fixedly connected to one side of the upper pressure rod 13 and the lower pressure rod 14. A rubber inner liner 4 is fixedly connected in the middle of the two fixing brackets 15.

[0018] Furthermore, the rubber inner bushing 4 is floatingly installed between the upper pressure rod 13 and the lower pressure rod 14. This ensures that the inner bushing is centered and subjected to bidirectional symmetrical compression, resulting in symmetrical force distribution on the rubber and maximizing its service life.

[0019] Furthermore, both springs 10 are rectangular (section) springs. They have a longer lifespan and are more durable than round (section) springs.

[0020] Furthermore, the upper and lower cover plates 2 and the valve body 1 are integrated as a whole.

[0021] Those skilled in the art should connect all electrical components and their compatible power supplies in this case via wires, and should select appropriate controllers according to actual conditions to meet control requirements. The specific connection and control sequence should refer to the working principle described below, where the electrical connections between the various electrical components are completed in sequence. The detailed connection methods are well-known technologies in the field. The following mainly introduces the working principle and process, and will not describe the electrical control further.

[0022] In this implementation plan:

[0023] Gas enters and exits through the nozzle 9 into the cylinder 8 above the moving plate base 7, causing the lower series of devices to rise and fall. This drives the piston connecting rod 6 of the lower cylinder and the upper pressure rod 13 in the middle of the upper pressure rod guide sleeve 12 sleeved on the lower pressure rod connecting rod 11. Together with the lower pressure rod 14 welded below, it compresses the rubber inner sleeve 4 fixed in the middle by the fixing frame 15, achieving closure. The double spring structure 10 ensures that the two ends of the pressure rod are evenly stressed, resulting in uniform pressure.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] 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 double-spring self-locking normally closed pneumatic pinch valve, comprising a valve body (1), a cover plate (2), a screw (3), a rubber inner sleeve (4), a spring sleeve (5), a cylinder piston connecting rod (6), a moving plate base (7), a cylinder (8), an air nozzle (9), a spring (10), a lower pressure rod connecting rod (11), an upper pressure rod guide sleeve (12), an upper pressure rod (13), a lower pressure rod (14), and a fixing frame (15), characterized in that, The valve body (1) is fixedly connected to the upper and lower ends with cover plates (2). The valve body (1) is composed of two parts, which are fixedly connected in the middle by screws (3) on both sides. A rubber inner sleeve (4) is fitted in the middle of the valve body (1). Spring sleeves (5) are fixedly connected to the left and right ends of the upper cover plate (2). A cylinder piston rod (6) is fixedly connected in the middle of the two spring sleeves (5). A cylinder (8) is fixedly connected above the cylinder piston rod (6). The cylinder (8) is placed above the moving plate base (7). An air nozzle (9) is fixedly connected to one side of the cylinder (8). The two spring sleeves (5) are both fixedly connected inside. A spring (10) is connected to the spring (10). A lower pressure rod connecting rod (11) is fixedly connected in the middle of each spring (10). An upper pressure rod guide sleeve (12) is slidably connected to the lower pressure rod connecting rod (11) below each spring (10). An upper pressure rod (13) is fixedly connected in the middle of the two pressure rod guide sleeves (12). A lower pressure rod (14) is welded to the two lower pressure rod connecting rods (11) below the upper pressure rod (13). A fixing frame (15) is fixedly connected to one side of the upper pressure rod (13) and the lower pressure rod (14). A rubber inner liner (4) is fixedly connected in the middle of the two fixing frames (15).

2. The double-spring self-locking normally closed pneumatic pinch valve according to claim 1, characterized in that, The rubber inner liner (4) is floatingly installed between the upper pressure rod (13) and the lower pressure rod (14).

3. A double-spring self-locking normally closed pneumatic pinch valve according to claim 1, characterized in that, The two springs (10) are rectangular (section) springs.

4. A double-spring self-locking normally closed pneumatic pinch valve according to claim 1, characterized in that, The upper and lower cover plates (2) and the valve body (1) are an integral unit.

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