Mechanical lock for gate valve

Abstract

The utility model relates to the related field of gate valves, in particular to a mechanical lock for a gate valve, which comprises a gate valve body, a valve rod, a fixed cover, a lock rod, a first through hole, a second through hole, a support plate, a spring, a long screw, a locking ring, a pull ring, an eccentric wheel, a rotating rod, a special-shaped lock hole and the like. The eccentric wheel and the pull ring are arranged, when the gate valve needs to be prevented from being operated by mistake, the lock rod can be pulled to move through the pull ring, so that opening and closing of the locking ring and the valve rod are achieved, and when higher safety guarantee needs to be provided for the gate valve, the lock rod can be opened and closed by rotating the pull ring to be separated from the lock rod. The special-shaped lock hole is formed in the lock rod, so that the lock rod can slide to open the locking ring and the valve rod only by using a special key to be matched with the special-shaped lock hole, opening and closing of the gate valve by unauthorized personnel are reduced, the safety of the gate valve is improved, different use conditions are met by using two opening modes through the mechanical lock, and the flexibility and practicability of the mechanical lock are improved.

Description

Technical Field

[0001] The utility model relates to the field of gate valves, in particular to a mechanical lock for gate valves. Background Art

[0002] Gate valve, also known as disc valve or gate valve, is a common type of valve, mainly used to regulate the flow of fluids (such as water, oil, gas, etc.) in pipeline systems. The opening and closing parts of the gate valve are gate plates, and the movement direction of the gate plates is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. In order to prevent misoperation, some gate valves will be equipped with mechanical locks. The mechanical locks provide limit positions for the gate valves to reduce the occurrence of misoperation.

[0003] The existing mechanical lock has a relatively simple opening method. Sometimes the gate valve is only used to prevent accidental opening and closing of the gate valve due to inadvertent touch. At this time, the mechanical lock design is relatively simple. However, for some gate valves with higher safety requirements, the simple mechanical lock is difficult to provide better protection, thereby reducing the flexibility of the mechanical lock and reducing the practicality of the mechanical lock. Summary of the invention

[0004] Therefore, in order to solve the above-mentioned shortcomings, the utility model provides a mechanical lock for a gate valve to solve the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a mechanical lock for a gate valve, comprising a gate valve body and a valve stem rotatably installed in the gate valve body, a mechanical lock structure is arranged on the gate valve body, and the mechanical lock structure comprises a fixed cover movably installed on the valve stem and connected to the top of the gate valve body, a locking ring arranged in the fixed cover and locked and fixed on the valve stem by a long screw, and a locking rod slidably installed in the fixed cover;

[0006] The locking rod matches the inner side of the groove formed on the side surface of the locking ring, and the end of the locking rod away from the locking ring movably penetrates the inner side wall of the fixed cover, and a second through hole is formed on the locking rod;

[0007] A pull ring is threadedly mounted on one end of the locking rod away from the locking ring;

[0008] An eccentric wheel is movably installed in the second through hole, and a rotating rod rotatably connected to the inner side of the fixed cover is fixedly installed on the inner ring of the eccentric wheel. The rotating rod movably penetrates the top end surface of the fixed cover, and a special-shaped locking hole is opened on the top end surface of the rotating rod.

[0009] Preferably, the end of the locking rod away from the locking rod is flush with the side surface of the fixing cover.

[0010] Preferably, the locking rod is provided with a first through hole, a support plate connected to the inner wall of the fixed cover movably passes through the first through hole, and the support plate is connected to the inner end surface of the first through hole through a spring.

[0011] Preferably, the locking ring is provided with two grooves matching the locking rod, and the two grooves correspond to the opening and closing states of the gate valve body respectively.

[0012] Preferably, the special-shaped lock hole is a Y-shaped structure.

[0013] Preferably, an arc-shaped groove is formed on the inner wall of the second through hole near one end of the locking ring, and the eccentric wheel presses against the inner end surface of the arc-shaped groove after rotating 90° counterclockwise.

[0014] Preferably, a spacing is provided between the eccentric wheel and the inner front end and the inner left end of the second through hole, and the spacing between the left end surface of the eccentric wheel and the inner left end surface of the second through hole is greater than the depth of the groove on the locking ring.

[0015] Beneficial effects of the utility model:

[0016] The utility model is provided with an eccentric wheel and a pull ring. When it is only necessary to prevent the gate valve from being operated incorrectly, the lock rod can be pulled to move by the pull ring, thereby realizing the opening and closing of the locking ring and the valve stem. When it is necessary to provide higher security for the gate valve, the pull ring can be separated from the lock rod by rotating the pull ring, so that the lock rod can only slide to open the locking ring and the valve stem by using a special key in conjunction with the special-shaped lock hole, thereby reducing the opening and closing of the gate valve by unauthorized personnel and improving the safety of the gate valve. The mechanical lock uses two opening modes to meet different usage conditions, thereby improving the flexibility and practicality of the mechanical lock. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 The utility model Figure 1 A schematic diagram of the structure enlargement in the middle;

[0019] Figure 3 It is a schematic diagram of the locking ring connection structure viewed from above of the utility model;

[0020] Figure 4 It is a schematic diagram of the second perforated connection structure viewed from above of the utility model.

[0021] Among them: gate valve body-1, valve stem-2, fixed cover-3, locking rod-4, first through hole-5, second through hole-6, support plate-7, spring-8, long screw-9, locking ring-10, pull ring-11, eccentric wheel-12, rotating rod-13, special-shaped locking hole-14. DETAILED DESCRIPTION

[0022] In order to further explain the technical solution of the present utility model, it is described in detail through specific embodiments below.

[0023] like Figure 1 As shown, the utility model provides a mechanical lock for a gate valve, comprising a gate valve body 1 and a valve stem 2 rotatably mounted in the gate valve body 1, and a mechanical lock structure is arranged on the gate valve body 1;

[0024] like Figures 1 to 4 As shown, the mechanical lock structure in this embodiment includes a fixed cover 3 movably mounted on the valve stem 2 and connected to the top of the gate valve body 1, a locking ring 10 arranged in the fixed cover 3 and locked and fixed on the valve stem 2 by a long screw 9, and a locking rod 4 slidably mounted in the fixed cover 3, and the locking rod 4 can move horizontally along the inner side of the fixed cover 3;

[0025] The locking rod 4 matches the inner side of the groove formed on the side surface of the locking ring 10, and the locking rod 4 matches the groove to lock and fix the locking ring 10, so that the locking ring 10 and the valve stem 2 can rotate freely, thereby improving the safety of the gate valve. The right end of the locking rod 4 moves horizontally through the inner right end of the fixed cover 3, and the locking rod 4 is provided with a second through hole 6 that passes through its upper and lower end surfaces;

[0026] A pull ring 11 is threadedly mounted on one end of the lock rod 4 away from the locking ring 10, so that the lock rod 4 can be driven to move horizontally by pulling the pull ring 11;

[0027] An eccentric wheel 12 is movably mounted in the second through hole 6, and a rotating rod 13 is vertically fixed to the inner ring of the eccentric wheel 12 and is horizontally rotatably connected to the inner side of the fixed cover 3. The rotating rod 13 movably penetrates the top surface of the fixed cover 3, and a special-shaped lock hole 14 is provided on the top surface of the rotating rod 13, so that the rotating rod 13 can be driven to rotate by opening the special-shaped lock hole 14 with a special key;

[0028] The end of the locking rod 4 away from the locking rod 4 is flush with the side surface of the fixed cover 3 to prevent the locking rod 4 from protruding outward and causing an outsider to pull the locking rod 4;

[0029] There is a gap between the eccentric wheel 12 and the inner front end and the inner left end of the second through hole 6, and the gap between the left end surface of the eccentric wheel 12 and the inner left end surface of the second through hole 6 is greater than the depth of the groove on the locking ring 10, so that the eccentric wheel 12 can rotate horizontally stably inside the second through hole 6;

[0030] In this embodiment, the lock rod 4 is provided with a first through hole 5, through which a support plate 7 connected to the inner wall of the fixed cover 3 movably passes, and the support plate 7 is connected to the inner end surface of the first through hole 5 through a spring 8, so that the lock rod 4 is stably fitted in the groove on the locking ring 10 by the elastic force of the spring 8;

[0031] In this embodiment, the locking ring 10 is provided with two grooves matching the locking rod 4, and the two grooves correspond to the open and closed states of the gate valve body 1 respectively, so that the locking rod 4 cooperates with the grooves to provide positioning for the valve stem 2 when the gate valve is in different states;

[0032] In this embodiment, the special-shaped lock hole 14 is a Y-shaped structure;

[0033] In this embodiment, an arc groove is formed on the inner wall of the second through hole 6 near one end of the locking ring 10, and when the eccentric wheel 12 rotates 90° counterclockwise, it presses against the inner end surface of the arc groove, so that the eccentric wheel 12 presses against the arc groove to prevent the locking rod 4 from moving at will;

[0034] Specifically, when in use, the locking rod 4 cooperates with the groove on the locking ring 10 to provide locking positioning for the valve stem 2 to prevent the valve stem 2 from being rotated at will, thereby preventing the gate valve body 1 from being opened and closed at will. When the gate valve needs to be opened and closed, the locking rod 4 can be driven to move to the right by pulling the pull ring 11, so that the locking rod 4 is separated from the groove on the locking ring 10. At this time, the locking rod 4 does not provide locking positioning for the valve stem 2, and the locking rod 4 compresses the spring 8 when moving, and then the valve stem 2 can be rotated to open and close the gate valve. When the gate valve is opened and closed, the pulling force on the pull ring 11 is cancelled. At this time, the locking rod 4 is reset by the elastic force of the spring 8 and enters the inner side of another groove on the locking ring 10. The locking rod 4 cooperates with another groove to continue to provide locking positioning for the valve stem 2 to prevent the valve stem 2 from rotating at will.

[0035] When it is necessary to provide higher security for the gate valve, the pull ring 11 can be rotated. Since the pull ring 11 and the locking rod 4 are threadedly connected, the pull ring 11 and the locking rod 4 are separated. At this time, when the mechanical lock needs to be unlocked, a special key needs to be inserted into the special-shaped lock hole 14, and the key is rotated to cooperate with the special-shaped lock hole 14 to drive the rotating rod 13 and the eccentric wheel 12 to rotate clockwise. When the eccentric wheel 12 rotates, it pushes the second perforation 6 and drives the locking rod 4 to move to the right. At this time, the locking rod 4 can be disengaged from the groove on the locking ring 10, and then the gate valve can be opened and closed. After the operation is completed, the rotating rod 13 can be rotated counterclockwise to drive the eccentric wheel 12 to support the arc groove at the left end of the inner side of the second perforation 6. The eccentric wheel 12 cooperates with the arc groove to provide further limitation for the locking rod 4 to prevent external unauthorized personnel from using the pull ring 11 to connect the locking rod 4 and then pull the locking rod 4 to move, so as to further improve the safety of the gate valve.

[0036] The above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mechanical lock for a gate valve, comprising a gate valve body and a valve stem rotatably mounted in the gate valve body, wherein the gate valve body is provided with a mechanical lock structure; It is characterized in that The mechanical lock structure includes a fixed cover movably mounted on the valve stem and connected to the top of the gate valve body, a locking ring arranged in the fixed cover and fixed to the valve stem by long screws, and a locking rod slidably mounted in the fixed cover; The locking rod matches the inner side of the groove formed on the side surface of the locking ring, and the end of the locking rod away from the locking ring movably penetrates the inner side wall of the fixed cover, and a second through hole is formed on the locking rod; A pull ring is threadedly mounted on one end of the locking rod away from the locking ring; An eccentric wheel is movably installed in the second through hole, and a rotating rod rotatably connected to the inner side of the fixed cover is fixedly installed on the inner ring of the eccentric wheel. The rotating rod movably penetrates the top end surface of the fixed cover, and a special-shaped locking hole is opened on the top end surface of the rotating rod.

2. A mechanical lock for a gate valve according to claim 1, characterized in that: One end of the locking rod away from the locking rod is flush with the side surface of the fixing cover.

3. A mechanical lock for a gate valve according to claim 1, characterized in that: The locking rod is provided with a first through hole, and a support plate connected to the inner wall of the fixed cover movably passes through the first through hole, and the support plate is connected to the inner end surface of the first through hole through a spring.

4. A mechanical lock for a gate valve according to claim 1, characterized in that: The locking ring is provided with two grooves matching the locking rod, and the two grooves correspond to the opening and closing states of the gate valve body respectively.

5. According to claim 1, a mechanical lock for a gate valve is characterized in that: The special-shaped lock hole is a Y-shaped structure.

6. A mechanical lock for a gate valve according to claim 1, characterized in that: An arc groove is formed on the inner wall of the second through hole near one end of the locking ring, and the eccentric wheel presses against the inner end surface of the arc groove after rotating 90° counterclockwise.

7. A mechanical lock for a gate valve according to claim 1, characterized in that: The eccentric wheel is provided with a spacing from the inner front end and the inner left end of the second through hole, and the spacing between the left end surface of the eccentric wheel and the inner left end surface of the second through hole is greater than the depth of the groove on the locking ring.

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