Round plane valve hand wheel movable forcing device

Abstract

The utility model discloses a circular plane valve hand wheel movable forcing device, and relates to the technical field of general mechanical equipment. Comprising a force arm, a guide through groove formed in the length direction of the force arm, a sliding strip arranged in the guide through groove in a sliding mode, a driving device for driving the sliding strip to move, a fixed jaw arranged below the front end of the guide through groove, and a movable jaw movably arranged below the sliding strip and matched with the fixed jaw. The fixed jaw and the movable jaw form a clamping mechanism for clamping a valve hand wheel, and an auxiliary force application mechanism for controlling the rotating direction of the movable jaw and increasing clamping force is arranged on the sliding strip. The valve hand wheel stress application device replaces traditional common tools such as crowbars, wrenches and screwdrivers which are inconvenient to apply stress on valve hand wheels, and has the advantages of being convenient and fast to operate, stable and high in safety.

Description

Technical Field

[0001] The utility model relates to the technical field of general mechanical equipment, and more specifically to the technical field of a circular plane valve hand wheel movable force adding device. Background Art

[0002] In daily production and life, valves are important control components of pipeline systems. They can control the flow, pressure, direction and cutoff function of the medium, ensure the normal operation of the pipeline, and improve the safety and efficiency of the pipeline. At the same time, valves can also quickly close the pipeline in an emergency and effectively avoid accidents.

[0003] The valve handwheel is a rotating handle installed on the valve. It is connected to the valve so that the operator can easily open or close the valve. The size and arm length of the valve handwheel directly affect the opening or closing torque of the valve, and can also control the flow rate, pressure and other factors of the pipeline medium. In special cases such as internal jamming, the opening or closing torque of the valve becomes larger. If the valve is to be opened or closed normally, it is necessary to increase the size and arm length of the valve handwheel. Since the handwheel and the body of the valve are matched when they leave the factory, it is inconvenient to temporarily replace them during operation. Usually, the valve handwheel is temporarily increased. However, most valve handwheels are round on the outside, lacking fixed supports specifically for temporary external force measures, and have a smooth and rounded appearance. It is inconvenient to add force to them with common tools such as crowbars, wrenches, and screwdrivers. Even if they can be barely added, they are unstable and lack safety during operation. Utility Model Content

[0004] The purpose of the utility model is to solve the above technical problems and provide a circular plane valve hand wheel movable force adding device.

[0005] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0006] The utility model provides a movable force-adding device for a circular plane valve handwheel, comprising a force arm, a guide groove arranged along the length direction of the force arm, a sliding bar slidably arranged in the guide groove, a driving device for driving the sliding bar to move, a fixed jaw arranged below the front end of the guide groove, and a movable jaw movably arranged below the sliding bar and cooperating with the fixed jaw. The fixed jaw and the movable jaw constitute a clamping mechanism for clamping the valve handwheel, and the sliding bar is provided with an auxiliary force-adding mechanism for controlling the rotation direction of the movable jaw and increasing the clamping force.

[0007] In one embodiment, the driving device is a manual driving mechanism, which includes a rack arranged at the top of the sliding bar along the moving direction, two worm supports fixedly arranged at the upper end of the force arm, and a manual rotating core rotatably installed at both ends between the two worm supports. The manual rotating core is a worm with a spiral shape and meshing with the rack, and the rack is provided with a plurality of worm wheel grooves meshing with the worm.

[0008] Specifically, the worm is fixed to the upper part of the lever arm by a worm support, and the worm meshes with the rack on the upper part of the sliding bar (the meshing principle of the worm and the rack is similar to the driving principle of an adjustable wrench). When the worm rotates, it drives the sliding bar to slide back and forth in the guide slot of the lever arm, thereby driving the movable jaw to move back and forth to adjust the size of the jaw.

[0009] In one embodiment, a movable jaw limit block is fixedly provided at the front bottom of the sliding bar, and a movable area for installing the movable jaw exists between the movable jaw limit block and the sliding bar, so that the movable jaw can only move horizontally within the movable area.

[0010] Specifically, the movable jaw limit block and the sliding bar form an active area limited in the vertical direction, and the movable jaw is located in the active area at the bottom of the front end of the sliding bar, so that the movable jaw can only move horizontally in the active area.

[0011] In one embodiment, the movable jaw includes a clamping portion and a mounting plate arranged on the top rear side of the clamping portion, the mounting plate is located in the movable area, and a left rotating column and a right rotating column are symmetrically arranged at the left and right ends of the top rear side of the mounting plate, and a left guide groove and a right guide groove are symmetrically arranged on the left and right sides of the front end of the upper surface of the sliding bar, which respectively cooperate with the left rotating column and the right rotating column. The left rotating column and the right rotating column extend out of the upper surface of the sliding bar through the left guide groove and the right guide groove, respectively, and cooperate with the auxiliary force application mechanism.

[0012] In one embodiment, the auxiliary force-applying mechanism includes a reversing paddle, which is triangular in shape, and the lower surface of one corner of the rear end of the reversing paddle is rotatably connected to the upper surface of the sliding bar through a fixing bolt, and the lower surfaces of the left and right corners of the front end of the reversing paddle are respectively provided with a left limiting column and a right limiting column, the left limiting column and the right limiting column are respectively located in the left guide groove and the right guide groove, and the left limiting column and the right limiting column are respectively used for limiting the left rotating column and the right rotating column;

[0013] It also includes a sliding bar limiting block arranged on the upper surface of the sliding block located between the reversing paddle and the rack, and the sliding bar limiting block is located at the front end of the worm support.

[0014] In one embodiment, the movable jaws are symmetrically arranged. When in operation, the line between the center of the left rotating column and the left edge of the clamping portion is located to the right of the line between the center of the left rotating column and the rotation center line of the valve handwheel; the line between the center of the right rotating column and the right edge of the clamping portion is located to the left of the line between the center of the right rotating column and the rotation center line of the valve handwheel.

[0015] Specifically, there are left-rotating columns and right-rotating columns on the top of the movable jaw, respectively. The movable jaw is clamped on the valve handwheel by adjusting the manual drive mechanism, and the manual drive mechanism is stopped. When the movable jaw clamps the valve handwheel clockwise (valve closing direction) rotating force arm, the reversing paddle is manually rotated to the right, and the right limit column of the reversing paddle clamps the right rotating column. The movable jaw will rotate clockwise with the right rotating column as the center under the friction force of the valve handwheel to the right, which will make the movable jaw further clamp the valve handwheel, which is conducive to the device to close the valve more smoothly; and if the force arm is rotated counterclockwise (valve opening direction) at this time, the movable jaw will rotate counterclockwise with the right rotating column as the center under the friction force of the valve handwheel to the left, which will make the movable jaw tend to loosen the valve handwheel, which is conducive to removing the device from the valve handwheel;

[0016] When the movable jaw clamps the valve handwheel and rotates the force arm counterclockwise (valve opening direction), the reversing paddle is manually rotated to the left, and the left limit column of the reversing paddle clamps the left rotating column. The movable jaw will rotate counterclockwise around the left rotating column under the friction force of the valve handwheel to the left, which will further clamp the valve handwheel and facilitate the device to open the valve. At this time, if the force arm is rotated clockwise (valve closing direction), the movable jaw will rotate clockwise around the left rotating column under the friction force of the valve handwheel to the right, which will tend to loosen the valve handwheel and facilitate the removal of the device from the valve handwheel.

[0017] When working, the line between the center of the left rotating column and the left edge of the clamping part is located on the right side of the line between the center of the left rotating column and the rotation center line of the valve handwheel; the line between the center of the right rotating column and the right edge of the clamping part is located on the left side of the line between the center of the right rotating column and the rotation center line of the valve handwheel. This structure is set up so that after locking one of the rotating columns, the movable jaw can further tighten the valve handwheel or relatively loosen the valve handwheel around the locked rotating column.

[0018] In one embodiment, a handle is further included at the end of the lever arm.

[0019] In one embodiment, the handle is made of plastic or rubber, so that the palm can hold the lever arm more comfortably. The overall size of the device is not limited and can be adjusted in proportion according to actual conditions.

[0020] In one embodiment, the material of the lever arm is one of carbon steel, cast iron or aluminum alloy, and both side walls of the guide slot of the lever arm are provided with sliding bar rails that cooperate with the sliding bar.

[0021] Specifically, the material of the lever arm is high-strength material such as carbon steel, cast iron or aluminum alloy. The lever arm has a hollow structure, and the hollowness forms a sliding bar rail to facilitate the sliding of the sliding bar back and forth. At the same time, when the two jaws clamp the valve handwheel, the guide groove can allow the lever arm to bypass the raised part of the center axis of the valve handwheel, so that the bottom of the lever arm fits the valve handwheel, which is more conducive to stable and safe operation.

[0022] In one embodiment, the sliding bar is a rectangular parallelepiped structure and can slide back and forth in the sliding bar rail. The fixed jaw is located at the front end of the lever arm and is made of the same material as the lever arm and is integrally formed with the lever arm.

[0023] The beneficial effects of the utility model are as follows:

[0024] 1. The utility model replaces the traditional crowbars, wrenches, screwdrivers and other commonly used tools that are inconvenient to apply force to the valve handwheel. At the same time, it is easy to operate, stable and safe. The overall size of the device is controllable and can be applied to all circular plane valve handwheels. The size of the jaws can also be adjusted. One device can be applied to valve handwheels of various radii. The solution has a simple structure and low cost, and can improve work efficiency and safety to a certain extent.

[0025] 2. Hold the handle with your palm and pick up the device. Put the bottom of the force arm against the top of the valve handwheel and move it slowly so that the fixed jaw clamps one side of the valve handwheel; rotate the worm with your fingers to adjust the movement of the sliding bar so that the movable jaw clamps the other side of the valve handwheel. To open the valve, turn the reversing paddle at the top of the sliding bar counterclockwise, rotate the force arm counterclockwise, and drive the valve handwheel to rotate counterclockwise; to close the valve, turn the reversing paddle at the top of the sliding bar clockwise, rotate the force arm clockwise, and drive the valve handwheel to rotate clockwise. Rotate the force arm in the opposite direction to remove the device from the top of the valve handwheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of a circular plane valve hand wheel movable force adding device;

[0028] Figure 2It is a top view of a circular plane valve hand wheel movable force device;

[0029] Figure 3 It is a front view of a circular plane valve hand wheel movable force device;

[0030] Figure 4 It is a bottom view of a circular plane valve hand wheel movable force device;

[0031] Figure 5 It is a right view of a hand wheel movable force adding device for a circular plane valve;

[0032] Figure 6 It is a left view of a circular plane valve hand wheel movable force device;

[0033] Figure 7 It is a schematic diagram of a circular plane valve hand wheel movable force device (with valve);

[0034] Figure 8 It is a front view of a circular plane valve hand wheel movable force device (with valve);

[0035] Fig. 9 It is a top view of a circular plane valve hand wheel movable force device (with valve);

[0036] Fig.10 A schematic diagram of a reversing paddle;

[0037] Fig.11 is a schematic diagram of the movable jaws;

[0038] Fig.12 yes Figure 2 Schematic diagram without the reversing paddle;

[0039] Figure markings: 1-lever arm, 2-fixed jaw, 3-movable jaw, 4-movable jaw limit block, 5-sliding bar, 6-sliding bar limit block, 7-reversing paddle, 8-fixing bolt, 9-worm, 10-worm support, 11-rack, 12-handle, 13-valve handwheel, 14-valve body, 15-sliding bar rail, 16-left limit column, 17-right limit column, 18-left rotating column, 19-right rotating column. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] Example 1

[0045] like Figures 1 to 12 As shown, this embodiment provides a movable force-applying device for a circular plane valve handwheel, comprising a force arm 1, a guide groove arranged along the length direction of the force arm 1, a sliding bar 5 slidably arranged in the guide groove, a driving device for driving the sliding bar 5 to move, a fixed jaw 2 arranged below the front end of the guide groove, and a movable jaw 3 movably arranged below the sliding bar 5 and cooperating with the fixed jaw 2. The fixed jaw 2 and the movable jaw 3 constitute a clamping mechanism for clamping the valve handwheel 13, and the sliding bar 5 is provided with an auxiliary force-applying mechanism for controlling the rotation direction of the movable jaw 3 and increasing the clamping force.

[0046] Example 2

[0047] like Figures 1 to 12 As shown, this embodiment provides a movable force-applying device for a circular plane valve handwheel, comprising a force arm 1, a guide groove arranged along the length direction of the force arm 1, a sliding bar 5 slidably arranged in the guide groove, a driving device for driving the sliding bar 5 to move, a fixed jaw 2 arranged below the front end of the guide groove, and a movable jaw 3 movably arranged below the sliding bar 5 and cooperating with the fixed jaw 2. The fixed jaw 2 and the movable jaw 3 constitute a clamping mechanism for clamping the valve handwheel 13, and the sliding bar 5 is provided with an auxiliary force-applying mechanism for controlling the rotation direction of the movable jaw 3 and increasing the clamping force.

[0048] The driving device is a manual driving mechanism, which includes a rack 11 arranged at the top of the sliding bar 5 along the moving direction, two worm supports 10 fixedly arranged at the upper end of the force arm 1, and a manual rotating core rotatably installed between the two worm supports 10 at both ends. The manual rotating core is a worm 9 with a spiral shape and meshing with the rack 11, and a plurality of worm wheel grooves meshing with the worm 9 are arranged on the rack 11.

[0049] Specifically, the worm 9 is fixed to the upper part of the lever arm 1 by the worm support 10, and the worm 9 is meshed with the rack 11 on the upper part of the slide bar 5 (the meshing principle of the worm 9 and the rack 11 is similar to the driving principle of an adjustable wrench). When the worm 9 rotates, it drives the slide bar 5 to slide back and forth in the guide slot of the lever arm 1, thereby driving the movable jaw 3 to move back and forth, thereby adjusting the size of the jaw.

[0050] Example 3

[0051] This embodiment is further optimized on the basis of embodiment 2, specifically:

[0052] A movable jaw limit block 4 is fixedly arranged at the front bottom of the sliding bar 5. There is a movable area for installing the movable jaw 3 between the movable jaw limit block 4 and the sliding bar 5, so that the movable jaw 3 can only move horizontally within the movable area.

[0053] Specifically, the movable jaw limit block 4 and the sliding bar 5 form an active area limited in the vertical direction, and the movable jaw 3 is located in the active area at the bottom of the front end of the sliding bar 5, so that the movable jaw 3 can only move horizontally in the active area.

[0054] The movable jaw 3 includes a clamping portion and a mounting plate arranged on the top rear side of the clamping portion, the mounting plate is located in the movable area, and a left rotating column 18 and a right rotating column 19 are symmetrically arranged at the left and right ends of the top rear side of the mounting plate, and a left guide groove and a right guide groove respectively cooperating with the left rotating column 18 and the right rotating column 19 are symmetrically arranged on the left and right sides of the front end of the upper surface of the sliding bar 5, and the left rotating column 18 and the right rotating column 19 extend out of the upper surface of the sliding bar 5 through the left guide groove and the right guide groove respectively, and cooperate with the auxiliary force application mechanism.

[0055] Example 4

[0056] This embodiment is further optimized on the basis of embodiment 3, specifically:

[0057] The auxiliary force-applying mechanism includes a reversing paddle 7, which is triangular in shape. The lower surface of one corner of the rear end of the reversing paddle 7 is rotatably connected to the upper surface of the sliding bar 5 through a fixing bolt 8. The lower surfaces of the left and right corners of the front end of the reversing paddle 7 are respectively provided with a left limiting column 16 and a right limiting column 17. The left limiting column 16 and the right limiting column 17 are respectively located in the left guide groove and the right guide groove. The left limiting column 16 and the right limiting column 17 are respectively used for limiting the left rotating column 18 and the right rotating column 19;

[0058] The slide block is located between the reversing paddle 7 and the rack 11 and is provided with a slide bar limit block 6 on its upper surface. The slide bar limit block 6 is located at the front end of the worm support 10 at the front end.

[0059] The movable jaws 3 are symmetrically arranged. When working, the line between the center of the left rotating column 18 and the left edge of the clamping part is located on the right side of the line between the center of the left rotating column 18 and the rotation center line of the valve handwheel 13; the line between the center of the right rotating column 19 and the right edge of the clamping part is located on the left side of the line between the center of the right rotating column 19 and the rotation center line of the valve handwheel 13.

[0060] Specifically, there are left rotating column 18 and right rotating column 19 on the top of movable jaw 3, respectively. The movable jaw 3 is clamped on valve hand wheel 13 by adjusting manual driving mechanism, and the manual driving mechanism is stopped. When movable jaw 3 clamps valve hand wheel 13 and rotates force arm 1 clockwise (valve closing direction), the reversing paddle 7 is manually rotated on the right, and the right limit column 17 of reversing paddle 7 clamps right rotating column 19. Under the friction force of valve hand wheel 13 to the right, movable jaw 3 will rotate clockwise around right rotating column 19 as the center, which will make movable jaw 3 further clamp valve hand wheel 13, which is conducive to more stable closing of valve by device. If force arm 1 is rotated counterclockwise (valve opening direction) at this time, movable jaw 3 will rotate counterclockwise around right rotating column 19 as the center under the friction force of valve hand wheel 13 to the left, which will make movable jaw 3 tend to loosen valve hand wheel 13, which is conducive to removing device from valve hand wheel 13.

[0061] When the movable jaw 3 clamps the valve handwheel 13 and rotates the force arm 1 counterclockwise (in the direction of valve opening), the reversing paddle 7 is manually rotated to the left, and the left limit column 16 of the reversing paddle 7 clamps the left rotating column 18. The movable jaw 3 will rotate counterclockwise around the left rotating column 18 under the friction force of the valve handwheel 13 to the left, which will further clamp the valve handwheel 13, which is beneficial to the device to open the valve. At this time, if the force arm 1 is rotated clockwise (in the direction of valve closing), the movable jaw 3 will rotate clockwise around the left rotating column 18 under the friction force of the valve handwheel 13 to the right, which will tend to loosen the valve handwheel 13, which is beneficial to remove the device from the valve handwheel 13.

[0062] During operation, the line between the center of the left rotating column 18 and the left edge of the clamping part is located on the right side of the line between the center of the left rotating column 18 and the rotation center line of the valve handwheel 13; the line between the center of the right rotating column 19 and the right edge of the clamping part is located on the left side of the line between the center of the right rotating column 19 and the rotation center line of the valve handwheel 13. This structure is set up to enable the movable jaw 3 to further tighten the valve handwheel 13 or relatively loosen the valve handwheel 13 around the locked rotating column after one of the rotating columns is locked.

[0063] Example 5

[0064] This embodiment is further optimized on the basis of any one of Embodiments 1 to 4, specifically:

[0065] A handle 12 is also included at the end of the lever arm 1 .

[0066] The handle 12 is made of plastic or rubber, so that the palm can hold the lever 1 more comfortably. The overall size of the device is not limited and can be adjusted in proportion according to actual conditions.

[0067] The material of the lever arm 1 is one of carbon steel, cast iron or aluminum alloy. The side walls of both sides of the guide slot of the lever arm 1 are provided with sliding bar rails 15 matched with the sliding bar 5 .

[0068] Specifically, the material of the lever arm 1 is high-strength material such as carbon steel, cast iron or aluminum alloy. The lever arm 1 is a hollow structure, and the hollowness forms a sliding bar rail 15 to facilitate the sliding of the sliding bar 5 back and forth. At the same time, when the two jaws clamp the valve handwheel 13, the guide groove can allow the lever arm 1 to bypass the raised part of the central axis of the valve handwheel 13, so that the bottom of the lever arm 1 fits the valve handwheel 13, which is more conducive to stable and safe operation.

[0069] The slide bar 5 is a rectangular parallelepiped structure and can slide back and forth in the slide bar rail 15 . The fixed jaw 2 is located at the front end of the lever arm 1 , and is made of the same material as the lever arm 1 and is integrally formed with the lever arm 1 .

Claims

1. A circular plane valve hand wheel active force device, characterized in that: The invention comprises a force arm (1), a guide slot arranged along the length direction of the force arm (1), a sliding bar (5) slidably arranged in the guide slot, a driving device for driving the sliding bar (5) to move, a fixed jaw (2) arranged below the front end of the guide slot, and a movable jaw (3) movably arranged below the sliding bar (5) and cooperating with the fixed jaw (2); the fixed jaw (2) and the movable jaw (3) constitute a clamping mechanism for holding a valve hand wheel (13); and the sliding bar (5) is provided with an auxiliary force-applying mechanism for controlling the rotation direction of the movable jaw (3) and increasing the clamping force.

2. A circular plane valve hand wheel movable force adding device according to claim 1, characterized in that: The driving device is a manual driving mechanism, comprising a rack (11) arranged at the top of the sliding bar (5) along the moving direction, two worm supports (10) fixedly arranged at the upper end of the force arm (1), and a manual rotating core with two ends rotatably installed between the two worm supports (10), the manual rotating core is a worm (9) with a spiral shape and meshing with the rack (11), and the rack (11) is provided with a plurality of worm wheel grooves meshing with the worm (9).

3. A circular plane valve hand wheel movable force adding device according to claim 2, characterized in that: A movable jaw limit block (4) is fixedly arranged at the bottom of the front end of the sliding bar (5), and a movable area for installing the movable jaw (3) exists between the movable jaw limit block (4) and the sliding bar (5), so that the movable jaw (3) can only move horizontally within the movable area.

4. A circular plane valve hand wheel movable force adding device according to claim 3, characterized in that: The movable jaw (3) comprises a clamping portion and a mounting plate arranged on the rear side of the top of the clamping portion, the mounting plate being located in the movable area, a left rotating column (18) and a right rotating column (19) being symmetrically arranged at the left and right ends of the rear side of the top of the mounting plate, a left guide groove and a right guide groove respectively cooperating with the left rotating column (18) and the right rotating column (19) being symmetrically arranged on the left and right sides of the front end of the upper surface of the sliding bar (5), the left rotating column (18) and the right rotating column (19) respectively extending out of the upper surface of the sliding bar (5) through the left guide groove and the right guide groove, and cooperating with the auxiliary force applying mechanism.

5. A circular plane valve hand wheel movable force adding device according to claim 4, characterized in that: The auxiliary force-applying mechanism comprises a reversing paddle (7), the reversing paddle (7) is triangular in shape, the lower surface of one corner of the rear end of the reversing paddle (7) is rotatably connected to the upper surface of the sliding bar (5) through a fixing bolt (8), and the lower surfaces of the left and right corners of the front end of the reversing paddle (7) are respectively provided with a left limiting column (16) and a right limiting column (17), the left limiting column (16) and the right limiting column (17) are respectively located in the left guide groove and the right guide groove, and the left limiting column (16) and the right limiting column (17) are respectively used for limiting the left rotating column (18) and the right rotating column (19); It also includes a sliding bar limit block (6) disposed on the upper surface of the sliding block located between the reversing paddle (7) and the rack (11), and the sliding bar limit block (6) is located at the front end of the worm support (10) at the front end.

6. A circular plane valve hand wheel movable force adding device according to claim 5, characterized in that: The movable jaws (3) are symmetrically arranged. When in operation, the line between the center of the left rotating column (18) and the left edge of the clamping portion is located on the right side of the line between the center of the left rotating column (18) and the rotation center line of the valve handwheel (13); the line between the center of the right rotating column (19) and the right edge of the clamping portion is located on the left side of the line between the center of the right rotating column (19) and the rotation center line of the valve handwheel (13).

7. A circular plane valve hand wheel movable force adding device according to claim 1, characterized in that: It also includes a handle (12) located at the end of the lever arm (1).

8. A circular plane valve hand wheel movable force adding device according to claim 7, characterized in that: The handle (12) is made of plastic or rubber.

9. The circular plane valve hand wheel movable force adding device according to claim 1, characterized in that: The material of the force arm (1) is one of carbon steel, cast iron or aluminum alloy, and the side walls of the guide slot of the force arm (1) are both provided with sliding bar rails (15) that cooperate with the sliding bar (5).

10. The circular plane valve hand wheel movable force adding device according to claim 1, characterized in that: The sliding bar (5) is a rectangular parallelepiped structure and can slide back and forth in the sliding bar rail (15). The fixed jaw (2) is located at the front end of the lever arm (1) and is made of the same material as the lever arm (1) and is integrally formed with the lever arm (1).

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