Valve rod extension mechanism

Abstract

The utility model belongs to the technical field of valve rods, and particularly relates to a valve rod extension mechanism which comprises a fixed sleeve rod, a sliding rod is slidably connected into the fixed sleeve rod, two threaded frames are fixedly connected to the outer surface of the sliding rod, and the two side faces of each threaded frame make contact with the inner wall of the fixed sleeve rod. A controller, two threaded rods and two band-type brake motors are arranged on the outer side of the fixed sleeve rod, the power output end of each band-type brake motor is fixedly connected with the bottom end of the corresponding threaded rod, and the outer surface of each threaded rod is in threaded connection with the inner wall of the threaded frame. A valve can be conveniently connected with a hand wheel, an electric actuator and other driving devices for use, meanwhile, a controller is matched with a band-type brake motor, a threaded rod can be driven to rotate forwards and backwards on a limiting frame, a threaded frame can be driven to slide in a fixed sleeve rod through threaded transmission, and then a sliding rod can be driven to achieve precise lifting sliding in the fixed sleeve rod.

Description

Technical Field

[0001] This utility model belongs to the field of valve stem technology, and specifically relates to a valve stem extension mechanism. Background Technology

[0002] The valve stem is a key transmission component in a valve that connects the drive device and the opening and closing parts. It is mostly a cylindrical rod, with the upper end connected to the handwheel or electric actuator via a key or thread, and the lower end fixed to the gate, valve core, and other opening and closing parts. Its core function is to transmit the rotational or linear motion of the drive device to the opening and closing parts, thereby realizing the opening, closing, or flow regulation of the valve. At the same time, the stem body and the packing at the stuffing box form a seal to prevent media leakage. The material and structural design directly affect the reliability of the valve.

[0003] However, in actual valve applications, traditional extension mechanisms are often limited by structural designs such as bolt tightening, welding processes, or multi-stage mechanical clamping. They often require disassembling valve glands and stuffing boxes to adjust the length. Such operations not only require specialized tools such as wrenches and welding machines, but also involve cumbersome procedures. From disassembling accessories to positioning and debugging, multiple steps are usually required, and each adjustment takes a long time.

[0004] To address the aforementioned problems, this application proposes a valve stem extension mechanism. Utility Model Content

[0005] To address the aforementioned problems in the existing technology, this utility model provides a valve stem extension mechanism, which improves the ease of valve stem adjustment.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a valve stem extension mechanism, comprising a fixed sleeve rod, a sliding rod slidably connected inside the fixed sleeve rod, two threaded brackets fixedly connected to the outer surface of the sliding rod, both sides of each threaded bracket contacting the inner wall of the fixed sleeve rod, a controller, two threaded rods and two brake motors respectively provided on the outer side of the fixed sleeve rod, the power output end of each brake motor being fixedly connected to the bottom end of the threaded rod, the outer surface of each threaded rod being threadedly connected to the inner wall of the threaded bracket, and two limiting brackets rotatably connected to the outer surface of each threaded rod, with one side of each set of limiting brackets close to each other being fixedly connected to the outer surface of the fixed sleeve rod.

[0007] As a preferred embodiment of this utility model, a support plate is provided on the outer side of the fixed sleeve rod, and a fixing ring is fixedly connected to the inner wall of the support plate. The inner wall of the fixing ring is fixedly connected to the outer surface of the fixed sleeve rod.

[0008] As a preferred embodiment of this utility model, a mounting plate is fixedly connected to the bottom surface of the support plate, and the front side of the mounting plate is fixedly connected to the back side of the controller.

[0009] As a preferred embodiment of this utility model, two support seats are fixedly connected to the upper surface of the support plate, and the side of the two support seats that are close to each other is fixedly connected to the side of the two brake motors that are far apart from each other.

[0010] As a preferred embodiment of this utility model, two protective shells are fixedly connected to the upper surface of the support plate, and each protective shell is fitted over the outside of the brake motor.

[0011] As a preferred embodiment of this utility model, a protective ring is fixedly connected to the top end of the fixed sleeve rod, and the inner wall of the protective ring is in contact with the outer surface of the sliding rod.

[0012] As a preferred embodiment of this utility model, a limiting ring is fixedly connected to the outer surface of the sliding rod, and the bottom surface of the limiting ring is in contact with the upper surface of the protective ring.

[0013] As a preferred technical solution of this utility model, a protective ring is fixedly connected to the outer surface of each threaded rod, and the side of each group of protective rings that is close to each other is in contact with the side of each group of limiting frames that is far from each other.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting a fixed sleeve rod and a sliding rod, the valve can be conveniently connected to drive devices such as handwheels and electric actuators. At the same time, by using the controller in conjunction with the brake motor, the threaded rod can be driven to rotate in both directions on the limit frame. Through thread transmission, the threaded frame can be driven to slide within the fixed sleeve rod, thereby driving the sliding rod to achieve precise lifting and sliding within the fixed sleeve rod. This design does not require disassembling valve accessories and allows for quick adjustment of the overall length of the fixed sleeve rod and the sliding rod directly through the electronic control system, significantly improving the convenience and efficiency of valve rod adjustment. It is especially suitable for application scenarios that require frequent adjustments or are in space-constrained. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

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

[0017] Figure 2 This is a cross-sectional view of the fixed sleeve rod in this utility model;

[0018] Figure 3 This is a schematic diagram of the protective ring structure in this utility model;

[0019] Figure 4This is a schematic diagram of the structure of the brake motor in this utility model;

[0020] Figure 5 This is a cross-sectional view of the threaded rod in this utility model;

[0021] In the diagram: 1. Fixed sleeve rod; 2. Threaded rod; 3. Threaded bracket; 4. Limit bracket; 5. Protective shell; 6. Support plate; 7. Controller; 8. Mounting plate; 9. Protective ring; 10. Sliding rod; 11. Limit ring; 12. Support seat; 13. Brake motor; 14. Fixed ring; 15. Protective ring. Detailed Implementation

[0022] 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. Example

[0023] Please see Figure 1-5 The present invention provides the following technical solution: a valve stem extension mechanism, including a fixed sleeve rod 1, a sliding rod 10 slidably connected inside the fixed sleeve rod 1, two threaded brackets 3 fixedly connected to the outer surface of the sliding rod 10, both sides of each threaded bracket 3 contacting the inner wall of the fixed sleeve rod 1, a controller 7, two threaded rods 2 and two brake motors 13 respectively provided on the outer side of the fixed sleeve rod 1, the power output end of each brake motor 13 fixedly connected to the bottom end of the threaded rod 2, the outer surface of each threaded rod 2 threadedly connected to the inner wall of the threaded bracket 3, and two limiting brackets 4 rotatably connected to the outer surface of each threaded rod 2, the side of each set of limiting brackets 4 that is close to each other being fixedly connected to the outer surface of the fixed sleeve rod 1;

[0024] In this embodiment, the forward and reverse rotation of the threaded rod 2 and its thread transmission characteristics can drive the threaded frame 3 to slide up and down along the inner wall of the fixed sleeve rod 1. At the same time, with the help of the linear displacement of the threaded frame 3, the sliding rod 10 can be driven to extend and retract synchronously within the fixed sleeve rod 1, thereby realizing the combined length adjustment of the fixed sleeve rod 1 and the sliding rod 10 to accurately match the length requirements of the valve rod.

[0025] Specifically, a support plate 6 is provided on the outer side of the fixed sleeve rod 1, and a fixing ring 14 is fixedly connected to the inner wall of the support plate 6. The inner wall of the fixing ring 14 is fixedly connected to the outer surface of the fixed sleeve rod 1. In this embodiment, the support plate 6 can be stably installed on the fixed sleeve rod 1 through the fixing ring 14, thereby improving the stability of the support plate 6.

[0026] Specifically, a mounting plate 8 is fixedly connected to the bottom surface of the support plate 6. The front of the mounting plate 8 is fixedly connected to the back of the controller 7. In this embodiment, the controller 7 can be fixed by the mounting plate 8. The controller 7 is a PLC (Programmable Logic Controller), which is a digital computing and operating electronic system designed for industrial automation control scenarios. It stores instructions through a programmable memory and performs functions such as logical operations, sequential control, timing, counting, and arithmetic operations to control various industrial equipment in digital or analog form.

[0027] Specifically, two support seats 12 are fixedly connected to the upper surface of the support plate 6. The side of the two support seats 12 that are close to each other is fixedly connected to the side of the two brake motors 13 that are far apart from each other. In this embodiment, the brake motors 13 can be fixed by the support seats 12. At the same time, the brake motors 13 are special motors that integrate electromagnetic braking devices. Their core feature is that when the power is cut off or the machine needs to be stopped, the rotor can be quickly locked by electromagnetic brake to achieve precise positioning and prevent inertial slippage.

[0028] Specifically, two protective shells 5 are fixedly connected to the upper surface of the support plate 6. Each protective shell 5 is fitted over the outside of the brake motor 13. In this embodiment, the brake motor 13 can be protected inside by the protective shell 5, and the heat dissipation effect of the brake motor 13 can be guaranteed by the opening design of the protective shell 5.

[0029] Specifically, a protective ring 9 is fixedly connected to the top of the fixed sleeve rod 1. The inner wall of the protective ring 9 is in contact with the outer surface of the sliding rod 10. In this embodiment, the connection between the fixed sleeve rod 1 and the sliding rod 10 can be protected by the protective ring 9, thereby reducing the impact of dust on the sliding effect.

[0030] Specifically, a limiting ring 11 is fixedly connected to the outer surface of the sliding rod 10. The bottom surface of the limiting ring 11 is in contact with the upper surface of the protective ring 9. In this embodiment, the limiting ring 11 can limit the sliding rod 10 to a position that is fixed to the sliding rod 10 and can move the sliding rod 10 downward.

[0031] Specifically, a protective ring 15 is fixedly connected to the outer surface of each threaded rod 2. The side of each set of protective rings 15 that is close to each other is in contact with the side of each set of limiting frames 4 that is far from each other. In this embodiment, the protective rings 15 can limit and protect the threaded rod 2 within the limiting frame 4, thereby enabling the threaded rod 2 to rotate stably.

[0032] The working principle and usage process of this utility model are as follows: In use, firstly, connect the bottom end of the fixed sleeve rod 1 to the gate or valve core of the valve, and simultaneously connect the top end of the sliding rod 10 to the handwheel or electric actuator. Then, connect the brake motor 13 and controller 7 to the power supply via wires. When it is necessary to adjust the length of the valve rod, start the brake motor 13 through the controller 7. The brake motor 13 drives the threaded rod 2 to rotate forward or backward. Since the threaded rod 2 is threadedly connected to the threaded frame 3, and the threaded frame 3 is fixedly connected to the sliding rod 10, and the two sides of the threaded frame 3 are connected to the fixed sleeve... The inner wall of rod 1 restricts the rotation of threaded bracket 3. Therefore, the rotation of threaded rod 2 will cause threaded bracket 3 to slide up and down along the inner wall of fixed sleeve rod 1, thereby driving sliding rod 10 to extend and retract synchronously within fixed sleeve rod 1. This achieves combined length adjustment of fixed sleeve rod 1 and sliding rod 10 to accurately match the length requirements of valve rod. When the appropriate length is reached, controller 7 stops the brake motor 13, and the electromagnetic brake device of brake motor 13 is activated to quickly lock the rotor, prevent inertial slippage, maintain the stability of the adjusted length, and further improve the convenience of valve rod extension.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A valve stem extension mechanism, characterized in that: The device includes a fixed sleeve rod (1), which is slidably connected to a sliding rod (10). Two threaded brackets (3) are fixedly connected to the outer surface of the sliding rod (10). Both sides of each threaded bracket (3) are in contact with the inner wall of the fixed sleeve rod (1). A controller (7), two threaded rods (2) and two brake motors (13) are respectively provided on the outer side of the fixed sleeve rod (1). The power output end of each brake motor (13) is fixedly connected to the bottom end of the threaded rod (2). The outer surface of each threaded rod (2) is threadedly connected to the inner wall of the threaded bracket (3). Two limit brackets (4) are rotatably connected to the outer surface of each threaded rod (2). The side of each set of limit brackets (4) that are close to each other is fixedly connected to the outer surface of the fixed sleeve rod (1).

2. The valve stem extension mechanism according to claim 1, characterized in that: A support plate (6) is provided on the outer side of the fixed sleeve rod (1), and a fixing ring (14) is fixedly connected to the inner wall of the support plate (6). The inner wall of the fixing ring (14) is fixedly connected to the outer surface of the fixed sleeve rod (1).

3. The valve stem extension mechanism according to claim 2, characterized in that: The bottom surface of the support plate (6) is fixedly connected to the mounting plate (8), and the front of the mounting plate (8) is fixedly connected to the back of the controller (7).

4. The valve stem extension mechanism according to claim 2, characterized in that: Two support seats (12) are fixedly connected to the upper surface of the support plate (6). The side of the two support seats (12) that are close to each other is fixedly connected to the side of the two brake motors (13) that are far away from each other.

5. A valve stem extension mechanism according to claim 2, characterized in that: Two protective shells (5) are fixedly connected to the upper surface of the support plate (6), and each of the protective shells (5) is sleeved on the outside of the brake motor (13).

6. The valve stem extension mechanism according to claim 1, characterized in that: A protective ring (9) is fixedly connected to the top of the fixed sleeve rod (1), and the inner wall of the protective ring (9) is in contact with the outer surface of the sliding rod (10).

7. A valve stem extension mechanism according to claim 6, characterized in that: A limiting ring (11) is fixedly connected to the outer surface of the sliding rod (10), and the bottom surface of the limiting ring (11) is in contact with the upper surface of the protective ring (9).

8. A valve stem extension mechanism according to claim 1, characterized in that: Each of the threaded rods (2) has a protective ring (15) fixedly connected to its outer surface. The side of each set of protective rings (15) that is close to each other is in contact with the side of each set of limit frames (4) that is far away from each other.

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