Valve rod anti-rotation mechanism for electric gate valve

Abstract

The utility model relates to the technical field of electric gate valves, in particular to a valve rod anti-rotation mechanism for an electric gate valve, which comprises a transmission support, a valve rod and a valve rod nut, and further comprises a transition disc and a thrust clamping plate, an installation cavity is arranged between the outer wall of the upper end of the valve rod nut and the inner wall of the transmission support, and a backing ring is arranged at the bottom of the installation cavity. The backing ring is fixedly connected with the transmission support through a sunk screw, the transition disc is fixedly arranged on the backing ring, and a through hole allowing the valve rod nut to penetrate through is formed in the middle of the transition disc. The thrust clamping plate is detachably arranged on the transition disc, and a limiting structure for conducting rotation limiting on the valve rod nut is arranged on the side, close to the valve rod nut, of the thrust clamping plate. The transition disc and the thrust clamping plate are arranged between the transmission support and the valve rod nut, the valve rod nut is limited through the thrust clamping plate before the gate valve is transported, the valve rod nut is prevented from rotating freely, and therefore the situation that a sealing face is damaged due to the fact that the gate plate is opened in the transportation process is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of electric gate valves, and more specifically to a valve stem anti-rotation mechanism for electric gate valves. Background Art

[0002] Valve products are widely used in metallurgy, coking, electric power, petroleum and other industries, accounting for a considerable proportion of industrial products. In the valve industry, the connection parts with electric devices are mostly connected by valve stems, valve stem nuts, and thrust bearings. When the finished product is transported, the valve stem may be loose, which may easily cause the product to bump and damage the sealing surface after the gate is opened freely during transportation, thereby affecting the sealing performance of the product.

[0003] Therefore, it is necessary to design a valve stem anti-rotation mechanism. Utility Model Content

[0004] In order to overcome the deficiencies in the prior art, a valve stem anti-rotation mechanism for an electric gate valve is provided.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A valve stem anti-rotation mechanism for an electric gate valve, comprising a transmission support, a valve stem and a valve stem nut, wherein the valve stem nut is rotatably arranged on the transmission support, the valve stem is arranged in the valve stem nut and is threadedly connected to the valve stem nut, a toothed interface is arranged at the upper end of the valve stem nut, and further comprising a transition plate and a thrust clamping plate, an installation cavity is arranged between the outer wall of the upper end of the valve stem nut and the inner wall of the transmission support, a gasket is arranged at the bottom of the installation cavity, the gasket is fixedly connected to the transmission support by a countersunk screw, the transition plate is fixedly arranged on the gasket, and a through hole for the valve stem nut to penetrate is arranged in the middle of the transition plate;

[0007] The thrust clamping plate is detachably arranged on the transition plate, and a limiting structure for limiting the rotation of the valve stem nut is arranged on one side of the thrust clamping plate close to the valve stem nut.

[0008] Preferably, the thrust clamp includes a fan-shaped ring structure, and the inner end of the fan-shaped ring structure is plugged into a toothed interface on the valve stem nut.

[0009] Preferably, the thrust clamp includes a thrust ring, the inner side of which is provided with a plurality of sliding holes evenly distributed along the circumferential direction, a sliding rod is slidably arranged in the sliding hole and the sliding direction points to the axis of the thrust ring, and a position control mechanism is connected to one end of the sliding rod away from the axis of the thrust ring.

[0010] Preferably, the position control mechanism includes a control ring, a spring and a push block. The control ring is rotatably arranged on the thrust ring, and a planar thread is arranged on the lower end surface of the control ring. The spring and the push block are both arranged in the sliding hole. One end of the spring is fixedly connected to the end of the sliding rod away from the axis of the thrust ring, and the other end of the spring is fixedly connected to the push block. The upper end of the push block extends out of the thrust ring and cooperates with the planar thread at the lower end of the control ring.

[0011] Preferably, a slot is provided on one side of the transmission support, a control rod is fixedly connected to one side of the control ring, one end of the control rod extends out of the transmission support through the slot, and a locking mechanism is provided between the control rod and the transmission bracket.

[0012] Preferably, a thrust bearing is provided between the valve stem nut and the transmission support.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model is provided with a transition plate and a thrust plate between the transmission support and the valve stem nut. Before the gate valve is transported, the valve stem nut is limited by the thrust plate to prevent the valve stem nut from rotating freely, thereby avoiding damage to the sealing surface due to the gate opening during transportation.

[0015] 2. The utility model is provided with multiple sliding rods. By rotating the control ring, the plane thread on the lower end face of the control ring drives the multiple push blocks to move synchronously, and then the spring drives the sliding rod to move. When part of the sliding rod is inserted into the tooth interface, the valve stem nut is limited. The structural design of multiple sliding rods makes it convenient to limit the valve stem nut at multiple angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The specific implementation of the utility model will be further described in detail below with reference to the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the thrust plate structure of Example 1;

[0019] Figure 3 This is a schematic diagram of the thrust plate structure of Example 2;

[0020] Figure 4 Schematic diagram of thrust ring structure;

[0021] Figure 5 Schematic diagram of the control loop structure.

[0022] In the figure: 1-transmission support, 2-valve stem, 3-valve stem nut, 4-toothed interface, 5-transition plate, 6-fan ring structure, 7-installation cavity, 8-gasket, 9-thrust ring, 10-sliding hole, 11-sliding rod, 12-control ring, 13-spring, 14-push block, 15-plane thread, 16-control rod, 17-thrust bearing. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Embodiment 1:

[0025] like Figure 1 to Figure 2 As shown, a valve stem anti-rotation mechanism for an electric gate valve includes a transmission support 1, a valve stem 2, a valve stem nut 3, a transition plate 5 and a thrust clamp. The valve stem nut 3 is rotatably arranged on the transmission support 1, and a thrust bearing 17 is arranged between the valve stem nut 3 and the transmission support 1. The upper end of the thrust bearing 17 is limited by a pressure ring fixedly connected to the transmission support 1, and the lower end of the valve stem nut 3 is limited by a retaining ring and the lower end of the thrust bearing 17. The valve stem 2 is arranged in the valve stem nut 3 and is threadedly connected to the valve stem nut 3. The upper end of the valve stem nut 3 is provided with a toothed interface 4 for connecting to a motor.

[0026] An installation cavity 7 is provided between the outer wall of the upper end of the valve stem nut 3 and the inner wall of the transmission support 1. A gasket 8 is provided at the bottom of the installation cavity 7. The gasket 8 is fixedly connected to the transmission support 1 through a countersunk screw. The transition plate 5 is fixedly provided on the gasket 8. A through hole for the valve stem nut 3 to pass through is provided in the middle of the transition plate 5. The thrust clamp is detachably provided on the transition plate 5. Preferably, the thrust clamp includes a fan ring structure 6. The fan ring structure 6 is connected to the transition plate 5 through bolts. The inner end of the fan ring structure 6 is plugged into the tooth interface 4 on the valve stem nut 3. The gasket 8 is used to ensure that the height of the upper end surface of the transition plate 5 is higher than the lower bottom surface of the tooth interface 4, so that the inner end of the fan ring structure 6 can be smoothly inserted into the groove of the tooth interface 4. The bolts are used to prevent the fan ring structure 6 and the transition plate 5 from rotating relative to each other, thereby preventing the valve stem nut 3 from rotating relative to the transmission support 1. The valve stem is prevented from rotating.

[0027] Embodiment 2:

[0028] In the first embodiment, the inner end of the fan ring structure 6 must be aligned with the groove of the toothed interface 4 to be inserted, which is a complicated operation. Therefore, based on the first embodiment, the thrust plate structure is modified in the present embodiment.

[0029] like Figures 3 to 5 As shown, the thrust clamp includes a thrust ring 9, and the inner side of the thrust ring 9 is uniformly distributed with a plurality of sliding holes 10 along the circumferential direction. A sliding rod 11 is slidably arranged in the sliding hole 10 and the sliding direction points to the axis of the thrust ring 9. The end of the sliding rod 11 away from the axis of the thrust ring 9 is connected with a position control mechanism. Preferably, the position control mechanism includes a control ring 12, a spring 13 and a push block 14. The control ring 12 is rotatably arranged on the thrust ring 9, and a planar thread 15 is arranged on the lower end surface of the control ring 912. The spring 13 and the push block 14 are both arranged in the sliding hole 10, one end of the spring 13 is fixedly connected to the end of the sliding rod 11 away from the axis of the thrust ring 9, and the other end of the spring 13 is fixedly connected to the push block 14. The upper end of the push block 14 extends out of the thrust ring 9 and cooperates with the planar thread 15 at the lower end of the control ring 912. When the control ring 912 rotates, the planar thread 15 pushes the multiple push blocks 14 to move synchronously toward or away from the center of the thrust ring 9, and then drives the corresponding sliding rods 11 to move through the spring 13. When one end of some sliding rods 11 contacts the raised portion of the toothed interface 4, the corresponding sliding rods 11 no longer move with the push blocks 14, and the remaining sliding rods 11 are inserted into the groove portion of the toothed interface 4 and limit the rotation of the valve stem nut 3.

[0030] The push block 14 and the planar thread 15 cooperate with each other in a structure similar to a three-jaw chuck, and the rotating planar thread drives the multiple push blocks to move inward or outward synchronously.

[0031] Preferably, a slot is provided on one side of the transmission support 1, and a control rod 16 is fixedly connected to one side of the control ring 12. One end of the control rod 16 extends out of the transmission support 1 through the slot, and the control ring 912 can be driven to rotate by the control rod 16 without disassembly. A locking mechanism is provided between the control rod 16 and the transmission support 1 of the transmission bracket. The locking mechanism can be locked by a nut, and a thread is provided on the outer end of the control rod 16. The nut is threadedly connected to the control rod 16, and one end of the nut is pressed against the outer wall of the transmission support 1 to achieve locking.

[0032] Only the preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the protection scope of the present invention.

Claims

1. A valve stem anti-rotation mechanism for an electric gate valve, comprising a transmission support (1), a valve stem (2) and a valve stem nut (3), wherein the valve stem nut (3) is rotatably arranged on the transmission support (1), the valve stem (2) is arranged in the valve stem nut (3) and is threadedly connected to the valve stem nut (3), and a toothed interface (4) is arranged at the upper end of the valve stem nut (3), characterized in that: It also includes a transition plate (5) and a thrust clamping plate, an installation cavity (7) is provided between the outer wall of the upper end of the valve stem nut (3) and the inner wall of the transmission support (1), a gasket (8) is provided at the bottom of the installation cavity (7), the gasket (8) is fixedly connected to the transmission support (1) by a countersunk screw, the transition plate (5) is fixedly arranged on the gasket (8), and a through hole for the valve stem nut (3) to pass through is provided in the middle of the transition plate (5); The thrust clamping plate is detachably arranged on the transition plate (5), and a limiting structure for limiting the rotation of the valve stem nut (3) is arranged on a side of the thrust clamping plate close to the valve stem nut (3).

2. The valve stem anti-rotation mechanism for an electric gate valve according to claim 1, characterized in that: The thrust clamp comprises a fan-shaped ring structure (6), the inner end of the fan-shaped ring structure (6) being plugged into a toothed interface (4) on the valve stem nut (3).

3. The valve stem anti-rotation mechanism for an electric gate valve according to claim 1, characterized in that: The thrust clamp comprises a thrust ring (9), the inner side of the thrust ring (9) is provided with a plurality of sliding holes (10) evenly distributed along the circumferential direction, a sliding rod (11) is slidably arranged in the sliding hole (10) and the sliding direction points to the axis of the thrust ring (9), and one end of the sliding rod (11) away from the axis of the thrust ring (9) is connected to a position control mechanism.

4. The valve stem anti-rotation mechanism for an electric gate valve according to claim 3, characterized in that: The position control mechanism comprises a control ring (12), a spring (13) and a push block (14); the control ring (12) is rotatably arranged on the thrust ring (9); a planar thread (15) is arranged on the lower end surface of the control ring (12); the spring (13) and the push block (14) are both arranged in the sliding hole (10); one end of the spring (13) is fixedly connected to an end of the sliding rod (11) away from the axis of the thrust ring (9); the other end of the spring (13) is fixedly connected to the push block (14); the upper end of the push block (14) extends out of the thrust ring (9) and cooperates with the planar thread (15) at the lower end of the control ring (12).

5. The valve stem anti-rotation mechanism for an electric gate valve according to claim 4, characterized in that: A slot is provided on one side of the transmission support (1), a control rod (16) is fixedly connected to one side of the control ring (12), one end of the control rod (16) extends out of the transmission support (1) through the slot, and a locking mechanism is provided between the control rod (16) and the transmission support (1).

6. The valve stem anti-rotation mechanism for an electric gate valve according to claim 1, characterized in that: A thrust bearing (17) is provided between the valve stem nut (3) and the transmission support (1).

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