CN118009088A - Valve gear box capable of positioning valve to rotate at any angle and method - Google Patents

Abstract

The invention relates to a valve gear box capable of positioning a valve to rotate at any angle and a method thereof, and relates to the technical field of valves. The invention can adjust the opening angle of the valve, so that the valve body can control the flow of the fluid, and further can control the flow of some fluids in industrial production, thereby improving the quality of the produced products.

Description

Valve gear box capable of positioning valve to rotate at any angle and method

Technical Field

The invention relates to the technical field of valves, in particular to a valve gear box capable of positioning the rotation of a valve at any angle and a method thereof.

Background

The valve is a control component in the fluid conveying system and has the functions of stopping, adjusting, guiding, preventing backflow, stabilizing pressure, splitting flow or overflow pressure relief and the like.

Currently, the publication number CN114776792a is 22, and the chinese patent application published in 2022 is 07, which proposes a ball valve gear box, comprising a top cover, an upper box, a middle box, a lower box, a double-idler gear mechanism arranged between the top cover and the upper box, a first planetary gear mechanism arranged between the upper box and the middle box, and a second planetary gear mechanism arranged between the middle box and the lower box, wherein the double-idler gear mechanism comprises a driving wheel, a first idler gear, a second idler gear, a driven wheel and a driving shaft for driving the driving wheel to rotate, the driving wheel is sleeved outside the driving shaft, the first idler gear and the second idler gear are engaged with the driving wheel and the driven wheel, the upper part of the first planetary gear mechanism is connected with the driven wheel, the lower part of the first planetary gear mechanism is connected with the upper part of the second planetary gear mechanism, and the lower part of the second planetary gear mechanism is used for connecting with the top of a valve rod of the ball valve under water. The function of operating the high torque valve can be realized.

However, the valve is a necessary device for controlling the flow rate of the fluid in the fluid conveying operation, and at present, some factories need to control the flow rate of the fluid through the valve in the process of producing the product, when the flow rate of the fluid is larger or smaller, the production order of the factories is easily disturbed, and the production quality of the product is further reduced.

Disclosure of Invention

In order to control the rotation angle of the valve, the invention provides a valve gear box capable of positioning the rotation of the valve at any angle and a method thereof.

In a first aspect, the invention provides a valve gear box capable of positioning a valve to rotate at any angle, the valve gear box capable of positioning the valve to rotate at any angle comprises a bracket, a valve body, a transmission rod, an opening and closing plate, an adjusting mechanism and a driving mechanism, wherein the adjusting mechanism comprises an adjusting knob, an angle disc, a pointer and a fixing assembly, the fixing assembly comprises a rotating disc and a fixing rod, the valve body is arranged on the bracket, the transmission rod is rotationally connected to the valve body, the opening and closing plate is arranged on the transmission rod, the opening and closing plate is positioned in the valve body, the angle disc is arranged on the valve body, the adjusting knob is rotationally connected to the angle disc, one end of the pointer is arranged on the adjusting knob, the other end of the pointer is in butt joint with the angle disc, the rotating disc is coaxially arranged on one end of the transmission rod far away from the plate, a first tooth is arranged on the outer circumferential surface of the rotating disc, the fixing rod is arranged on the rotating disc, and the driving mechanism is arranged on the bracket and is used for driving the rotating disc to rotate.

Through adopting above-mentioned technical scheme, when the angle of opening and shutting of needs governing valve, through rotating adjust knob, drive the pointer rotation, make the pointer point to the angle that needs on the calibrated scale, and with the pointer is fixed, afterwards, it rotates to drive the rotary disk through actuating mechanism, the rotary disk drives the dead lever and rotates when rotating, when dead lever and pointer contact, the drive rotary disk is stopped, at this moment, the rotary disk passes through the transfer line and drives the board that opens and shuts and rotate, because the board that opens and shuts, transfer line and rotary disk are coaxial setting, when the rotary disk rotates certain angle, the board that opens and shuts rotates certain angle along with the rotary disk, and then make the valve body can control the flow of fluid, and then make in industrial production can control the flow of some fluid, and then improve the product quality of production.

Optionally, fixed subassembly still includes the slide bar, through-hole and a plurality of first recess have been seted up on the angle scale, the slide bar passes through-hole and angle scale sliding connection, adjust knob sets up on the slide bar, and adjust knob is located the angle scale top, the one side that adjust knob is close to the angle scale is provided with the second tooth.

Through adopting above-mentioned technical scheme, when angle regulation, upwards mention adjust knob for slide bar slides in the through-hole of seting up on the angle scale, and then makes the pointer keep away from the angle scale, when the degree of opening and shutting of need governing valve, aim at the angle on the angle scale with the pointer, afterwards move adjust knob downwards, make the second tooth on the adjust knob mesh with the first recess on the angle scale, when the dead lever on the rotary disk contacts with the pointer, reduce because the drive rotary disk rotates too fast, make the probability that the pointer takes place the displacement, and then improve the fixed precision of angle that opens and shuts of valve.

Optionally, a plurality of second grooves are further formed in the angle disc, and the second grooves and the first grooves are the same in pointing direction.

Through adopting above-mentioned technical scheme, when the flow of the angle control fluid that opens and shuts of valve is adjusted to needs, drive the directional angle of confirming of pointer through removing adjust knob, afterwards, make the pointer enter into the second recess, because every second recess all prescribes an angle, when the dead lever contacted the pointer, and then reduce under the contact of dead lever for the probability that the pointer takes place the displacement, and then improve the fixed precision of angle that opens and shuts of valve.

Optionally, actuating mechanism includes box, worm and drive assembly, the box sets up on the support, drive assembly sets up inside the box, the worm rotates to be connected on the box, the worm through first tooth with rotary disk meshing transmission.

Through adopting above-mentioned technical scheme, drive assembly drives the worm and rotates, and worm and the first tooth meshing on the rotary disk, and then drive the rotary disk and rotate, and then drive dwang and the board that opens and shuts rotate, and then realize controlling opening and shutting of the board.

Optionally, the drive assembly includes first gear, second gear, third gear, first transmission shaft, second transmission shaft and rotation handle, first transmission shaft and second transmission shaft all rotate and connect on the box, first transmission shaft with coaxial fixed connection of worm, first gear coaxial arrangement is on first transmission shaft, second gear and third gear all coaxial arrangement is on the second transmission shaft, first gear with second gear meshing transmission, the number of teeth of first gear is greater than the number of teeth of second gear, rotation handle sets up on the second transmission shaft is kept away from the one end of second gear.

Through adopting above-mentioned technical scheme, when adjusting the angle of opening and shutting of valve, the workman drives the second transmission shaft through rotating the handle and rotates, and then drives second gear and third gear and rotate, and the second gear drives first gear and rotates for first transmission shaft drives the worm and rotates, and then makes the worm drive the rotary disk rotate, because the number of teeth of first gear is greater than the number of teeth of second gear, and then reduces the angular velocity of worm, and then reduces the rotation speed of rotary disk, and then reduces under the striking of dead lever, the cracked probability of pointer emergence.

Optionally, the actuating mechanism still includes locking dish and locking bolt, locking dish coaxial coupling is on the second transmission shaft, set up the screw hole on the locking dish, locking bolt passes through screw hole threaded connection on the locking dish, and locking bolt with box butt.

Through adopting above-mentioned technical scheme, after the angle adjustment that opens and shuts of valve is accomplished, with locking bolt threaded connection on the locking dish to continue to twist and move locking bolt, make locking bolt's screw thread portion and box butt, and then realize the fixed to the second pivot, and then realize the fixed to the worm, and then reduce the probability of opening and shutting board opposite direction pivoted under fluidic impact, and then stabilize the angle that opens and shuts of opening and shutting board.

In a second aspect, the present invention provides a method for positioning a valve to rotate by any angle, the method comprising the steps of;

s-1: primary unlocking: unscrewing the locking bolt so that the locking bolt is far away from the box body;

s-2: primary angle adjustment: lifting the adjusting knob upwards to enable the sliding rod to slide in a through hole formed in the angle disc, further enabling the pointer to be far away from the angle disc, enabling the pointer to be aligned with the angle on the angle disc, then moving the adjusting knob downwards to enable the second tooth on the adjusting knob to be meshed with the first groove on the angle disc, enabling the pointer to enter the second groove, driving the second transmission shaft to rotate through the rotating handle, further driving the second gear and the third gear to rotate, enabling the second gear to drive the first gear to rotate, enabling the first transmission shaft to drive the worm to rotate, further enabling the worm to drive the rotating disc to rotate, and stopping driving the rotating disc to rotate when the fixed rod is in contact with the pointer;

S-3: and (3) angle locking: and (3) connecting the locking bolt on the locking disc in a threaded manner, and continuously screwing the locking bolt so that the threaded part of the locking bolt is abutted with the box body.

Optionally, a secondary unlocking step and a restoring step are further arranged after the angle locking step;

S-4: secondary unlocking: lifting the adjusting knob upwards to enable the sliding rod to slide in a through hole formed in the angle dial, enabling the pointer to be far away from the angle dial, enabling the pointer to be aligned with zero graduation on the angle dial, unscrewing the locking bolt, and enabling the locking bolt to be far away from the box body;

S-5: and (3) restoration: the handle is rotated in the opposite direction drives the second transmission shaft to rotate, and then drives the second gear and the third gear to rotate, and the second gear drives the first gear to rotate, so that the first transmission shaft drives the worm to rotate, and then the worm drives the rotating disk to rotate, when the fixed rod contacts with the pointer, the rotating disk is stopped to be driven to rotate, the locking bolt is in threaded connection with the locking disk, and the locking bolt is continuously screwed, so that the threaded part of the locking bolt is abutted with the box body.

In summary, the present invention includes at least one of the following beneficial technical effects:

1. Because opening and closing plate, transfer line and rotary disk are coaxial setting, when the rotary disk rotated certain angle, the opening and closing plate rotated certain angle along with the rotary disk, and then made the valve body can control the flow of fluid, and then made in industrial production can control the flow of some fluid, and then improved the product quality of production.

2. When angle is adjusted, upwards mention adjust knob for slide bar slides in the through-hole of seting up on the angle scale, and then makes the pointer keep away from the angle scale, when the degree of opening and shutting of need governing valve, aim at the angle on the angle scale with the pointer, afterwards move adjust knob downwards, make the second tooth on the adjust knob mesh with the first recess on the angle scale, when the dead lever on the rotary disk contacts with the pointer, reduce when the rotary disk is rotated too fast owing to the drive, make the probability that the pointer takes place the displacement, and then improve the fixed precision of angle that opens and shuts of valve.

3. After the opening and closing angle of the valve is adjusted, the locking bolt is in threaded connection with the locking disc, and the locking bolt is continuously screwed, so that the threaded part of the locking bolt is abutted with the box body, the second rotating shaft is fixed, the worm is fixed, the probability of reverse rotation of the opening and closing plate under fluid impact is reduced, and the opening and closing angle of the opening and closing plate is stabilized.

Drawings

FIG. 1 is a schematic overall structure of embodiment 1;

FIG. 2 is a schematic view of the overall structure of embodiment 1 from another view;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is a schematic view of the internal structure of the valve body;

fig. 5 is a schematic view of the internal structure of the case.

Reference numerals illustrate: 100. a bracket; 200. a valve body; 300. a transmission rod; 400. an opening plate; 500. a driving mechanism; 510. a case; 520. a worm; 530. a drive assembly; 531. a first gear; 532. a second gear; 533. a third gear; 534. a first drive shaft; 535. a second drive shaft; 536. rotating the handle; 540. a locking plate; 541. a threaded hole; 550. a locking bolt; 600. an adjusting mechanism; 610. an adjustment knob; 611. a second tooth; 620. an angle scale; 621. a through hole; 622. a first groove; 623. a second groove; 630. a pointer; 640. a fixing assembly; 641. a rotating disc; 642. a fixed rod; 643. a slide bar; 644. a first tooth.

Detailed Description

The invention is described in further detail below in connection with fig. 1-5.

Example 1:

The embodiment discloses a valve gear box that can fix a position valve rotation arbitrary angular position: referring to fig. 1-5, a valve gear box capable of positioning a valve to rotate at any angle comprises a bracket 100, a valve body 200, a transmission rod 300, an opening and closing plate 400, an adjusting mechanism 600 and a driving mechanism 500, wherein the valve body 200 is connected to the bracket 100 through bolts, the transmission rod 300 is rotatably connected to the valve body 200, the opening and closing plate 400 is connected to the transmission rod 300 through bolts, and the driving mechanism 500 is used for driving the adjusting mechanism 600 to adjust the opening and closing angle of the opening and closing plate 400.

Referring to fig. 1-5, the driving mechanism 500 includes a housing 510, a worm 520, a locking plate 540, a locking bolt 550, and a driving assembly 530; the adjustment mechanism 600 includes an adjustment knob 610, an angle dial 620, a pointer 630, and a securing assembly 640; the drive assembly 530 includes a first gear 531, a second gear 532, a third gear 533, a first drive shaft 534, a second drive shaft 535, and a rotating handle 536; the fixing assembly 640 includes a rotating plate 641, a fixing rod 642, and a sliding rod 643.

Referring to fig. 1-5, the box 510 is connected to the bracket 100 by a bolt, the worm 520 is rotatably connected to the box 510, the first transmission shaft 534 and the second transmission shaft 535 are both rotatably connected to the box 510, the first transmission shaft 534 is fixedly connected coaxially with the worm 520, the first gear 531 is coaxially arranged on the first transmission shaft 534, the second gear 532 and the third gear 533 are coaxially arranged on the second transmission shaft 535, the first gear 531 and the second gear 532 are engaged and driven, the number of teeth of the first gear 531 is greater than the number of teeth of the second gear 532, and the rotating handle 536 is arranged at one end of the second transmission shaft 535 away from the second gear 532; the locking plate 540 is coaxially connected to the second transmission shaft 535, a threaded hole 541 is formed in the locking plate 540, the locking bolt 550 is screwed to the locking plate 540 through the threaded hole 541, and the locking bolt 550 abuts against the box 510.

Referring to fig. 1-5, the angle disc 620 is connected to the valve body 200 by a bolt, the adjusting knob 610 is rotatably connected to the angle disc 620, one end of the pointer 630 is disposed on the adjusting knob 610, the angle disc 620 is provided with a through hole 621, a plurality of first grooves 622 and a plurality of second grooves 623, the second grooves 623 are the same as the first grooves 622 in direction, the slide rod 643 is slidably connected to the angle disc 620 by the through hole 621, the adjusting knob 610 is disposed on the slide rod 643, the adjusting knob 610 is located above the angle disc 620, a second tooth 611 is disposed on a surface of the adjusting knob 610 close to the angle disc 620, the rotary disc 641 is coaxially disposed on an end of the transmission rod 300 away from the opening and closing plate 400, a first tooth 644 is disposed on an outer circumferential surface of the rotary disc 641, the fixed rod 642 is fixedly connected to the rotary disc 641, and the worm 520 is meshed with the rotary disc 641.

When the opening and closing angle of the valve is adjusted, the adjusting knob 610 is lifted upwards, the sliding rod 643 slides in the through hole 621 formed in the angle dial 620, the pointer 630 is further away from the angle dial 620, when the opening and closing degree of the adjusting valve is needed, the pointer 630 is aligned with the angle on the angle dial 620, then the adjusting knob 610 is moved downwards, the second teeth 611 on the adjusting knob 610 are meshed with the first groove 622 on the angle dial 620, the pointer 630 enters into the second groove 623, because each second groove 623 is assigned an angle, a worker drives the second transmission shaft 535 to rotate through the rotating handle 536, the second gear 532 and the third gear 533 to rotate, the second gear 532 drives the first gear 531 to rotate, the first transmission shaft 534 drives the worm 520 to rotate, the worm 520 drives the rotating disc 641 to rotate, the fixed rod 642 is driven to rotate when the fixed rod 642 is in contact with the pointer 630, at this moment, the rotating disc 641 drives the opening and closing plate 400 to rotate through the transmission rod 300, and the opening and closing plate 300 and the rotating disc 641 are coaxially arranged, and the flow rate of fluid can be controlled to be improved, and the flow rate of the fluid can be controlled to be in a certain degree, and the valve body can be further rotated; after the opening and closing angle of the valve is adjusted, the locking bolt 550 is in threaded connection with the locking disc 540, and the locking bolt 550 is continuously screwed, so that the threaded portion of the locking bolt 550 is abutted against the box 510, the second rotating shaft is further fixed, the worm 520 is further fixed, the probability of reverse rotation of the opening and closing plate 400 under fluid impact is further reduced, and the opening and closing angle of the opening and closing plate 400 is further stabilized.

In this embodiment 1, the implementation principle of a valve gear case capable of positioning a valve to rotate at any angle is as follows:

When the opening and closing angle of the valve is adjusted, the adjusting knob 610 is lifted upwards, the sliding rod 643 slides in the through hole 621 formed in the angle dial 620, the pointer 630 is further away from the angle dial 620, when the opening and closing degree of the adjusting valve is needed, the pointer 630 is aligned with the angle on the angle dial 620, then the adjusting knob 610 is moved downwards, the second teeth 611 on the adjusting knob 610 are meshed with the first groove 622 on the angle dial 620, the pointer 630 enters into the second groove 623, because each second groove 623 is assigned an angle, a worker drives the second transmission shaft 535 to rotate through the rotating handle 536, the second gear 532 and the third gear 533 to rotate, the second gear 532 drives the first gear 531 to rotate, the first transmission shaft 534 drives the worm 520 to rotate, the worm 520 drives the rotating disc 641 to rotate, the fixed rod 642 is driven to rotate when the fixed rod 642 is in contact with the pointer 630, at this moment, the rotating disc 641 drives the opening and closing plate 400 to rotate through the transmission rod 300, and the opening and closing plate 300 and the rotating disc 641 are coaxially arranged, and the flow rate of fluid can be controlled to be improved, and the flow rate of the fluid can be controlled to be in a certain degree, and the valve body can be further rotated; after the opening and closing angle of the valve is adjusted, the locking bolt 550 is in threaded connection with the locking disc 540, and the locking bolt 550 is continuously screwed, so that the threaded portion of the locking bolt 550 is abutted with the box 510, and further the second rotating shaft is fixed, and further the worm 520 is fixed.

Example 2:

The embodiment discloses a method for positioning a valve to rotate by any angle, which comprises the following steps of;

S-1: primary unlocking: unscrewing the locking bolt 550 so that the locking bolt 550 is away from the case 510;

S-2: primary angle adjustment: lifting the adjusting knob 610 upwards to enable the sliding rod 643 to slide in the through hole 621 formed in the angle dial 620, further enabling the pointer 630 to be far away from the angle dial 620, aligning the pointer 630 with the angle on the angle dial 620, then moving the adjusting knob 610 downwards to enable the second tooth 611 on the adjusting knob 610 to be meshed with the first groove 622 on the angle dial 620, enabling the pointer 630 to enter the second groove 623, enabling the second transmission shaft 535 to rotate through the rotating handle 536, further enabling the second gear 532 and the third gear 533 to rotate, enabling the second gear 532 to drive the first gear 531 to rotate, enabling the first transmission shaft 534 to drive the worm 520 to rotate, further enabling the worm 520 to drive the rotating disc 641 to rotate, and stopping driving the rotating disc 641 to rotate when the fixed rod 642 is in contact with the pointer 630;

s-3: and (3) angle locking: the locking bolt 550 is screwed to the locking plate 540, and the locking bolt 550 is continued to be screwed so that the threaded portion of the locking bolt 550 abuts against the case 510.

S-4: secondary unlocking: lifting the adjusting knob 610 upward to slide the slide bar 643 in the through hole 621 formed on the angle dial 620, keeping the pointer 630 away from the angle dial 620, aligning the pointer 630 with the zero scale on the angle dial 620, unscrewing the locking bolt 550, and keeping the locking bolt 550 away from the box 510;

S-5: and (3) restoration: the handle 536 is rotated in the opposite direction to drive the second transmission shaft 535 to rotate, and then drive the second gear 532 and the third gear 533 to rotate, and the second gear 532 drives the first gear 531 to rotate, so that the first transmission shaft 534 drives the worm 520 to rotate, and then the worm 520 drives the rotating disc 641 to rotate, when the fixed rod 642 contacts with the pointer 630, the rotating disc 641 stops being driven to rotate, the locking bolt 550 is in threaded connection with the locking disc 540, and the locking bolt 550 is continuously screwed, so that the threaded portion of the locking bolt 550 is abutted against the box 510.

In this embodiment 2, a method for positioning a valve to rotate by any angle is implemented according to the following principle:

When positioning the rotation angle of the valve, a worker first unscrews the locking bolt 550 so that the locking bolt 550 is far from the case 510; lifting the adjusting knob 610 upwards to enable the sliding rod 643 to slide in the through hole 621 formed in the angle dial 620, further enabling the pointer 630 to be far away from the angle dial 620, aligning the pointer 630 with the angle on the angle dial 620, then moving the adjusting knob 610 downwards to enable the second tooth 611 on the adjusting knob 610 to be meshed with the first groove 622 on the angle dial 620, enabling the pointer 630 to enter the second groove 623, enabling the second transmission shaft 535 to rotate through the rotating handle 536, further enabling the second gear 532 and the third gear 533 to rotate, enabling the second gear 532 to drive the first gear 531 to rotate, enabling the first transmission shaft 534 to drive the worm 520 to rotate, further enabling the worm 520 to drive the rotating disc 641 to rotate, and stopping driving the rotating disc 641 to rotate when the fixed rod 642 is in contact with the pointer 630; the locking bolt 550 is screwed to the locking plate 540, and the locking bolt 550 is continued to be screwed so that the threaded portion of the locking bolt 550 abuts against the case 510. Lifting the adjusting knob 610 upward to slide the slide bar 643 in the through hole 621 formed on the angle dial 620, keeping the pointer 630 away from the angle dial 620, aligning the pointer 630 with the zero scale on the angle dial 620, unscrewing the locking bolt 550, and keeping the locking bolt 550 away from the box 510; the handle 536 is rotated in the opposite direction to drive the second transmission shaft 535 to rotate, and then drive the second gear 532 and the third gear 533 to rotate, and the second gear 532 drives the first gear 531 to rotate, so that the first transmission shaft 534 drives the worm 520 to rotate, and then the worm 520 drives the rotating disc 641 to rotate, when the fixed rod 642 contacts with the pointer 630, the rotating disc 641 stops being driven to rotate, the locking bolt 550 is in threaded connection with the locking disc 540, and the locking bolt 550 is continuously screwed, so that the threaded portion of the locking bolt 550 is abutted against the box 510.

The above embodiments are not intended to limit the scope of the present invention, so: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.

Claims (8)

1. The utility model provides a valve gear box of valve rotation arbitrary angular position which can fix a position valve which characterized in that: comprises a bracket (100), a valve body (200), a transmission rod (300), an opening and closing plate (400) and an adjusting mechanism (600) and a driving mechanism (500), wherein the adjusting mechanism (600) comprises an adjusting knob (610), an angle dial (620), a pointer (630) and a fixing assembly (640), the fixing assembly (640) comprises a rotating disc (641) and a fixing rod (642), the valve body (200) is arranged on the bracket (100), the transmission rod (300) is rotationally connected to the valve body (200), the opening and closing plate (400) is arranged on the transmission rod (300), the opening and closing plate (400) is positioned inside the valve body (200), the angle dial (620) is arranged on the valve body (200), one end of the pointer (630) is arranged on the adjusting knob (610), the other end of the pointer (630) is abutted to the angle dial (620), the valve body (641) is coaxially arranged at one end, far away from the rotating disc (400), of the transmission rod (300), the first tooth (641) is arranged on the outer circumferential surface of the rotating disc (641), and the driving mechanism (644) is arranged on the outer circumferential surface of the rotating disc (100), for driving the rotary disk (641) to rotate.

2. A valve gear box capable of positioning a valve to rotate at any angular position according to claim 1, wherein: the fixed subassembly (640) still includes slide bar (643), through-hole (621) and a plurality of first recess (622) have been seted up on angle scale (620), slide bar (643) are through-hole (621) and angle scale (620) sliding connection, adjust knob (610) set up on slide bar (643), and adjust knob (610) are located angle scale (620) top, the one side that adjust knob (610) is close to angle scale (620) is provided with second tooth (611).

3. A valve gear box capable of positioning a valve to rotate at any angular position according to claim 2, wherein: the angle disc (620) is also provided with a plurality of second grooves (623), and the second grooves (623) and the first grooves (622) have the same direction.

4. A valve gear box capable of positioning a valve for rotation at any angular position according to any one of claims 1-3, wherein: the driving mechanism (500) comprises a box body (510), a worm (520) and a driving assembly (530), wherein the box body (510) is arranged on the support (100), the driving assembly (530) is arranged inside the box body (510), the worm (520) is rotationally connected to the box body (510), and the worm (520) is in meshed transmission with the rotating disc (641) through a first tooth (644).

5. A valve gear box capable of positioning a valve to rotate at any angular position as claimed in claim 4, wherein: the drive assembly (530) comprises a first gear (531), a second gear (532), a third gear (533), a first transmission shaft (534), a second transmission shaft (535) and a rotating handle (536), wherein the first transmission shaft (534) and the second transmission shaft (535) are both rotationally connected to the box body (510), the first transmission shaft (534) is fixedly connected with the worm (520) coaxially, the first gear (531) is coaxially arranged on the first transmission shaft (534), the second gear (532) and the third gear (533) are coaxially arranged on the second transmission shaft (535), the first gear (531) is in meshing transmission with the second gear (532), the number of teeth of the first gear (531) is larger than that of the second gear (532), and the rotating handle (536) is arranged at one end, far away from the second gear (532), of the second transmission shaft (535).

6. A valve gear box capable of positioning a valve to rotate at any angular position according to claim 5, wherein: the driving mechanism (500) further comprises a locking disc (540) and a locking bolt (550), the locking disc (540) is coaxially connected to the second transmission shaft (535), a threaded hole (541) is formed in the locking disc (540), the locking bolt (550) is in threaded connection with the locking disc (540) through the threaded hole (541), and the locking bolt (550) is in butt joint with the box body (510).

7. A method of positioning a valve gear box capable of positioning a valve to rotate any angular position as claimed in any one of claims 1 to 6, wherein: comprises the following steps of;

S-1: primary unlocking: unscrewing the locking bolt (550) so that the locking bolt (550) is away from the case (510);

S-2: primary angle adjustment: lifting the adjusting knob (610) upwards to enable the sliding rod (643) to slide in a through hole (621) formed in the angle dial (620), further enabling the pointer (630) to be far away from the angle dial (620), enabling the pointer (630) to be aligned with the angle on the angle dial (620), then moving the adjusting knob (610) downwards to enable a second tooth (611) on the adjusting knob (610) to be meshed with a first groove (622) on the angle dial (620), enabling the pointer (630) to enter into the second groove (623), enabling the second transmission shaft (535) to rotate through rotating the handle (536), further enabling the second gear (532) and the third gear (533) to rotate, enabling the second gear (532) to enable the first gear (531) to rotate, enabling the worm (534) to enable the worm (520) to enable the rotating disc (641) to rotate, and stopping driving the rotating disc (641) to rotate when the fixing rod (642) is in contact with the pointer (630);

S-3: and (3) angle locking: the locking bolt (550) is screwed onto the locking plate (540), and the locking bolt (550) is continued to be screwed so that the threaded portion of the locking bolt (550) abuts against the case (510).

8. A method of positioning a valve gear case according to claim 7, wherein: a secondary unlocking step and a restoring step are further arranged after the angle locking step;

S-4: secondary unlocking: lifting the adjusting knob (610) upwards to enable the sliding rod (643) to slide in a through hole (621) formed in the angle dial (620), enabling the pointer (630) to be far away from the angle dial (620), enabling the pointer (630) to be aligned with a zero scale on the angle dial (620), unscrewing the locking bolt (550), and enabling the locking bolt (550) to be far away from the box body (510);

S-5: and (3) restoration: the handle (536) is rotated in opposite direction drives second transmission shaft (535) and then drives second gear (532) and third gear (533) to rotate, second gear (532) drive first gear (531) rotate, make first transmission shaft (534) drive worm (520) rotate, and then make worm (520) drive rotary disk (641) rotate, when dead lever (642) and pointer (630) contact, stop driving rotary disk (641) and rotate, with locking bolt (550) threaded connection on locking dish (540), and continue to twist locking bolt (550), make the screw portion and box (510) butt of locking bolt (550).