Opening degree indicating and rust preventing device for lead screw gate valve and lead screw gate valve

Abstract

The utility model provides an opening degree indicating and rust preventing device for a lead screw gate valve and the lead screw gate valve, and belongs to the technical field of gate valves. The opening degree indicating and rust preventing device for the lead screw gate valve comprises an indicating and rust preventing cover, a pointer and a material pressing and rust preventing sleeve; the indicating and rust-proof cover is used for enclosing the valve rod nut and the valve rod which are positioned above the hand wheel; the pointer is used for being fixed to the valve rod located above the hand wheel. And the pressing and rust-proof sleeve is used for enclosing the valve rod between the sealing filler mounting hole and the valve rod nut mounting hole. The anti-rust protection device can perform anti-rust protection on the common lead screw gate valve under the coal mine, meanwhile, the valve opening degree display is added, and the safe use state and the field practicability of the gate valve are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gate valves, and specifically discloses an opening degree indicating and rust-proof device for a lead screw gate valve and a lead screw gate valve. Background Technique

[0002] According to Article 249 of the "Coal Mine Safety Regulations": A surface fire fighting water pool and an underground fire fighting pipeline system must be provided in the mine. The underground fire fighting pipeline system should be laid to the excavation and working faces, with branch pipes and valves provided every 100 m, but in the belt conveyor roadway, branch pipes and valves should be provided every 50 m. Article 687: A compressed air pipeline should be provided on the disaster avoidance route in the mining area. The diameter of the main pipeline should not be less than 100 mm, and the diameter of the pipeline in the excavation and working faces should not be less than 50 mm. The air supply valves provided on the compressed air pipeline are spaced no more than 200 m apart. In mines with complex and extremely complex hydrogeological conditions, compressed air pipelines should be laid at the highest points of each level, mining area, and uphill roadway, and air supply valves should be provided. A water supply pipeline should be laid on the disaster avoidance route in the mining area, and a water supply valve should be installed near the air supply valve.

[0003] According to the above regulations, it can be seen that the pipeline network system in coal mines plays a crucial role and is related to the life safety of a large number of coal mine workers. At present, the pipeline gate valves used in most underground coal mines in China are lead screw gate valves. As Figure 1 shown, the lead screw gate valve includes a valve body, a valve plate, a valve cover, fastening bolts, sealing packing, a packing gland, articulated bolts, a valve stem, a valve stem nut, a handwheel, and a locking nut; flanges are provided on the top surface of the valve body and the bottom surface of the valve cover, and the two are connected by fastening bolts; the valve cover is provided with a sealing packing installation hole and a valve stem nut installation hole, and there is a hollow area between the sealing packing installation hole and the valve stem nut installation hole. Hinged ears are provided on both sides of the sealing packing installation hole, and the bottom ends of the articulated bolts are hinged to the hinged ears; the sealing packing is installed in the sealing packing installation hole; the packing gland is provided with a threaded hole for cooperating with the articulated bolt and a valve stem hole for cooperating with the valve stem; the packing gland is located in the hollow area, passes through the articulated bolt to compress the sealing packing, and the articulated bolt above the packing gland is fastened by a nut; the valve stem nut is provided with external threads and internal threads, and a limiting ring extending outward is provided on the bottom surface; the valve stem nut passes through the valve stem nut installation hole and the handwheel, and the limiting ring presses the lower end surface of the valve stem nut installation hole; the locking nut is installed on the external threads of the valve stem nut above the handwheel to press the handwheel; the valve plate is located in the valve body; the valve stem passes through the valve stem nut, the valve stem hole of the packing gland, and the sealing packing, and the bottom end is connected to the valve plate. Rotating the handwheel, the valve stem nut rotates accordingly, the valve stem that cooperates with the internal threads of the valve stem nut rises and falls, and the valve plate connected to the valve stem rises and falls accordingly.

[0004] The material of the lead screw gate valve is mostly ordinary steel or cast steel. During use, due to the harsh production environment in the coal mine, the valve stem of the lead screw gate valve is extremely prone to corrosion and rust. The surface of the rusted valve stem is severely damaged, resulting in the inability of the lead screw gate valve to open or close normally, which is likely to pose a safety hazard to the safe production of the coal mine. In case of an emergency, it will directly endanger the lives of coal mine workers. Moreover, the existing lead screw gate valve cannot visually observe the opening and closing degree of the valve plate, making it inconvenient to use. Summary of the Invention

[0005] The present invention provides an opening and closing degree indicating and rust-proof device for a lead screw gate valve and a lead screw gate valve to improve the problems that the valve stem of the existing lead screw gate valve is extremely prone to corrosion and rust and that the existing lead screw gate valve cannot visually observe the opening and closing degree of the valve plate.

[0006] The opening and closing degree indicating and rust-proof device for a lead screw gate valve provided by the present invention includes an indicating and rust-proof cover, a pointer, and a pressing and rust-proof sleeve. The indicating and rust-proof cover is used to enclose the valve stem nut and the valve stem above the handwheel. It is a tubular structure with a closed first end and an open second end. An internal thread is provided on the inner wall near the second end, and the internal thread cooperates with the external thread of the valve stem nut. An observation hole and scale lines for indicating the opening and closing degree of the valve plate are axially provided on the side wall. The pointer is used to be fixed on the valve stem above the handwheel. The pressing and rust-proof sleeve is used to enclose the valve stem between the packing installation hole and the valve stem nut installation hole. It includes a tubular structure and hinge platforms provided on both sides of the tubular structure. Both the first end and the second end of the tubular structure are open, and threaded holes for cooperating with hinge bolts are provided on the hinge platforms.

[0007] In the above opening and closing degree indicating and rust-proof device for a lead screw gate valve, a transparent partition is installed on the observation hole.

[0008] In the above opening and closing degree indicating and rust-proof device for a lead screw gate valve, the transparent partition is made of plexiglass or resin.

[0009] In the above opening and closing degree indicating and rust-proof device for a lead screw gate valve, the pointer is fixed on the top surface of the valve stem through a pointer fixing screw.

[0010] In the above opening and closing degree indicating and rust-proof device for a lead screw gate valve, an oil injection hole is provided on the tubular structure of the pressing and rust-proof sleeve, and an oil plug is installed on the oil injection hole.

[0011] The lead screw gate valve provided by the present utility model includes a valve body, a valve plate, a valve cover, a sealing packing, a hinge bolt, a valve stem, a valve stem nut, a handwheel, and an opening / closing degree indicating and rust-proof device for the above lead screw gate valve; the valve plate is located in the valve body; the top surface of the valve body is connected to the bottom surface of the valve cover; the valve cover is provided with a sealing packing installation hole and a valve stem nut installation hole, and there is a hollow area between the sealing packing installation hole and the valve stem nut installation hole. Hinge ears are arranged on both sides of the sealing packing installation hole, and the hinge ears are hinged to the bottom end of the hinge bolt; the sealing packing is installed in the sealing packing installation hole; the valve stem nut is provided with an external thread and an internal thread, and a limiting ring extending outward is arranged on the bottom surface; the valve stem nut passes through the valve stem nut installation hole and the handwheel, and the limiting ring presses the lower end surface of the valve stem nut installation hole; the pointer is fixed on the valve stem above the handwheel; the pressing and rust-proof sleeve is located in the hollow area, passes through the hinge bolt to press the sealing packing, and the hinge bolt above the hinge table is fastened by a nut; the valve stem passes through the valve stem nut, the pressing and rust-proof sleeve, and the sealing packing, and the bottom end is connected to the valve plate; the indicating and rust-proof cover is sleeved outside the valve stem nut and the valve stem above the handwheel, and the internal thread is matched with the external thread of the valve stem nut to press the handwheel.

[0012] In the above lead screw gate valve, flanges are provided on both the top surface of the valve body and the bottom surface of the valve cover, and the flanges are connected by fastening bolts.

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

[0014] The present utility model can carry out rust prevention for the commonly used lead screw gate valves in coal mines, and at the same time increase the display of the opening / closing degree of the valve, improving the safe use state and on-site practicability of the gate valve. Description of the Drawings

[0015] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 It is a structural schematic diagram of an existing lead screw gate valve;

[0017] Figure 2 It is a structural schematic diagram of the lead screw gate valve provided in Embodiment 2;

[0018] Figure 3 is Figure 2 exploded view of.

[0019] In the figure: 1 - valve body; 2 - valve cover; 3 - fastening bolt; 4 - packing gland; 5 - hinge bolt; 6 - valve stem; 7 - valve stem nut; 8 - handwheel; 9 - lock nut; 10 - indicating and rust - proof cover; 10.1 - observation hole; 10.2 - scale line; 11 - pointer; 12 - packing and rust - proof sleeve; 13 - pointer fixing screw. Specific implementation mode

[0020] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0021] Embodiment 1

[0022] In view of the actual situation of on - site production and in combination with the commonly used screw - driven gate valves in China, this embodiment provides an opening - closing degree indicating and rust - proof device for screw - driven gate valves. The following key objectives are required to be achieved during the design process:

[0023] 1. It is used in combination with the commonly used valves on the domestic market at present.

[0024] 2. The structure should be designed to be extremely simple and the principle should be simple, which is convenient for installation and replacement.

[0025] 3. It should be an accessory for the supporting screw - driven gate valve and can be produced and sold separately.

[0026] 4. Its practicability should be increased. The opening - closing degree indication scale of the gate valve should be increased, and the opening and closing size of the valve can be intuitively seen through the scale indication.

[0027] The above - mentioned opening - closing degree indicating and rust - proof device for screw - driven gate valves includes an indicating and rust - proof cover 10, a pointer 11 and a packing and rust - proof sleeve 12. The indicating and rust - proof cover 10 is used to enclose the valve stem nut 7 and the valve stem 6 above the handwheel 8. It is a tubular structure, with the first end being a spherical closed end and the second end being open. An internal thread is provided on the inner wall near the second end, and the internal thread cooperates with the external thread of the valve stem nut 7. An observation hole 10.1 and a scale line 10.2 for indicating the opening - closing degree of the valve plate are axially arranged on the side wall. The pointer 11 is used to be fixed on the valve stem 6 above the handwheel 8, rises and falls with the valve stem 6, and the position of the pointer 11 can be observed through the observation hole 10.1 and the corresponding scale value can be read. The packing and rust - proof sleeve 12 is used to enclose the valve stem 6 between the packing installation hole and the valve stem nut installation hole, includes a tubular structure and hinge platforms arranged on both sides of the tubular structure. Both the first end and the second end of the tubular structure are open, and threaded holes for cooperating with the hinge bolts 5 are provided on the hinge platforms.

[0028] In the above-mentioned opening / closing degree indicating and rust-proof device for the lead screw gate valve, a transparent partition is installed on the observation hole 10.1. The transparent partition is made of plexiglass or resin.

[0029] In the above-mentioned opening / closing degree indicating and rust-proof device for the lead screw gate valve, the pointer 11 is fixed to the top surface of the valve stem 6 through the pointer fixing screw 13 for easy installation.

[0030] In the above-mentioned opening / closing degree indicating and rust-proof device for the lead screw gate valve, an oil injection hole is provided on the tubular structure of the pressing and rust-proof sleeve 12, and an oil plug is installed on the oil injection hole. Lubricating oil can be poured into the pressing and rust-proof sleeve 12 through the oil injection hole to lubricate the valve stem 6.

[0031] Embodiment 2

[0032] This embodiment provides a lead screw gate valve, which includes a valve body 1, a valve plate, a valve cover 2, a sealing packing, a hinge bolt 5, a valve stem 6, a valve stem nut 7, a handwheel 8, and the above-mentioned opening / closing degree indicating and rust-proof device for the lead screw gate valve; the valve plate is located in the valve body 1; the top surface of the valve body 1 is connected to the bottom surface of the valve cover 2; the valve cover 2 is provided with a sealing packing installation hole and a valve stem nut installation hole, and there is a hollow area between the sealing packing installation hole and the valve stem nut installation hole. Hinge ears are provided on both sides of the sealing packing installation hole, and the hinge ears are hinged to the bottom end of the hinge bolt 5; the sealing packing is installed in the sealing packing installation hole; the valve stem nut 7 is provided with an external thread and an internal thread, and a limiting ring extending outward is provided on the bottom surface; the valve stem nut 7 passes through the valve stem nut installation hole and the handwheel 8, and the limiting ring presses the lower end surface of the valve stem nut installation hole; the pointer 11 is fixed to the valve stem 6 above the handwheel 8; the pressing and rust-proof sleeve 12 is located in the hollow area, passes through the hinge bolt 5 to press the sealing packing, and the hinge bolt 5 above the hinge platform is fastened by a nut; the valve stem 6 passes through the valve stem nut 7, the pressing and rust-proof sleeve 12, and the sealing packing, and the bottom end is connected to the valve plate; the indicating and rust-proof cover 10 is sleeved outside the valve stem nut 7 and the valve stem 6 above the handwheel 8, and the internal thread cooperates with the external thread of the valve stem nut 7 to press the handwheel 8.

[0033] In the above-mentioned lead screw gate valve, flanges are provided on both the top surface of the valve body 1 and the bottom surface of the valve cover 2, and the flanges are connected by fastening bolts 3.

[0034] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An opening and closing degree indicating and rust-proof device for a screw gate valve, characterized in that: Including indicating and rust-proof cover, pointer and pressing and rust-proof sleeve; The indicating and anti-rusting cover is used to enclose the valve stem nut and the valve stem above the hand wheel, and is a tubular structure, with a first end closed and a second end open, and an internal thread is provided on the inner wall near the second end, and the internal thread cooperates with the external thread of the valve stem nut, and an observation hole and a scale line for indicating the opening and closing degree of the valve plate are provided on the side wall along the axial direction; the pointer is used to be fixed on the valve stem above the hand wheel; The pressing and anti-rust sleeve is used to enclose the outside of the valve stem located between the sealing packing installation hole and the valve stem nut installation hole, and includes a tubular structure and a hinged platform arranged on both sides of the tubular structure. The first end and the second end of the tubular structure are both open, and the hinged platform is provided with a threaded hole that cooperates with the hinge bolt.

2. The opening and closing degree indicating and rust-proofing device for a screw gate valve according to claim 1 is characterized in that: A transparent partition is installed on the observation hole.

3. The opening and closing degree indicating and rust-proofing device for a screw gate valve according to claim 2 is characterized in that: The transparent partition is made of organic glass or resin.

4. The opening and closing degree indicating and rust-proofing device for a screw gate valve according to claim 1, characterized in that: The pointer is fixed on the top surface of the valve stem by a pointer fixing screw.

5. The opening and closing degree indicating and rust-proofing device for a screw gate valve according to claim 1, characterized in that: The tubular structure of the material pressing and rust-proof sleeve is provided with an oil filling hole, and an oil plug is installed on the oil filling hole.

6. A screw gate valve, comprising a valve body, a valve plate, a valve cover, a sealing packing, a hinge bolt, a valve stem, a valve stem nut and a hand wheel; The valve plate is located in the valve body; The top surface of the valve body is connected to the bottom surface of the valve cover; The valve cover is provided with a sealing packing installation hole and a valve stem nut installation hole, a hollow area is formed between the sealing packing installation hole and the valve stem nut installation hole, hinged ears are provided on both sides of the sealing packing installation hole, and the hinged ears are hinged to the bottom end of the hinged bolt; The sealing filler is installed in the sealing filler installation hole; The valve stem nut is provided with an external thread and an internal thread, and a limiting ring extending outward is provided on the bottom surface; The valve stem nut passes through the valve stem nut mounting hole and the hand wheel, and the limiting ring presses the lower end surface of the valve stem nut mounting hole; it is characterized in that: It also includes the opening and closing degree indicating and anti-rust device for the screw gate valve according to any one of claims 1 to 5; The pointer is fixed on the valve stem above the hand wheel; The material pressing and anti-rust sleeve is located in the hollow area, passes through the hinge bolts to press the sealing filler, and the hinge bolts located above the hinge platform are fastened by nuts; The valve stem passes through the valve stem nut, the pressing and rust-proof sleeve, and the sealing packing, and the bottom end is connected to the valve plate; The indicating and anti-rusting cover is sleeved on the valve stem nut and the outside of the valve stem located above the hand wheel, and the internal thread cooperates with the external thread of the valve stem nut to press the hand wheel.

7. The screw gate valve according to claim 6, characterized in that: The top surface of the valve body and the bottom surface of the valve cover are both provided with flanges, which are connected by fastening bolts.

Images