CN113503394A

CN113503394A - Double-ball valve

Info

Publication number: CN113503394A
Application number: CN202110786026.3A
Authority: CN
Inventors: 蒋健
Original assignee: Nantong Shifa Ship Machinery Co ltd
Current assignee: Nantong Shifa Ship Machinery Co ltd
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2021-10-15

Abstract

The invention discloses a double-ball valve, which realizes the simultaneous opening and closing of two ball valve components through a main driving device, utilizes the main driving device to drive a translation block A and a translation block B to move along opposite directions, leads the moving directions of two racks to be opposite, and leads the racks to be meshed with an adjusting gear to drive a valve rod to rotate, thereby realizing the opening and closing. The auxiliary driving device is used for realizing independent opening and closing of the two ball valve assemblies, the lifting seat is driven to move along the Z direction through the adjusting handle, the limiting column drives the annular belt to move between the first belt pulley and the second belt pulley, when the limiting column drives the annular belt to move to the first belt pulley, the annular belt is in friction transmission with the first belt pulley and the third belt pulley, and the auxiliary driving device is in a non-working state; when the limiting column drives the annular belt to move to the first belt pulley, the annular belt is in friction transmission with the first belt pulley and the third belt pulley, the auxiliary driving device is in a working state, the auxiliary handle is rotated, the valve rod and the ball body rotate through belt transmission and gear meshing.

Description

Double-ball valve

Technical Field

The invention particularly relates to a double-ball valve.

Background

Valves are accessories for pipes used to open and close the pipe, control flow direction, regulate and control parameters of the transport medium. The valve is a control part in a fluid conveying system and has the functions of stopping, adjusting, guiding, placing counter flow, stabilizing pressure, shunting or overflowing and relieving pressure and the like. Valves used in fluid control systems range in variety and size from the simplest shut-off valves to the variety of valves used in extremely complex autonomous systems.

The ball valve is a valve whose opening and closing piece is driven by valve rod and can make rotary motion around the axis of ball valve, and can control regulation and control of fluid. The multi-way ball valve can flexibly control the confluence, the diversion and the flow direction switching of the medium on the pipeline. However, the existing double-ball valve is inconvenient to operate and adjust, and can not simultaneously open and close two valve balls or independently open and close two valve balls according to needs.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a double-ball valve.

The technical scheme for solving the problems comprises the following steps: a double-ball valve comprises a valve body, wherein a channel penetrating along the X direction is arranged in the valve body, a pair of valve chambers distributed along the X direction is arranged in the channel, a ball valve assembly positioned in each valve chamber, a fixed block arranged at the top of the valve body, a partition plate arranged on the fixed block, a valve cover arranged on the fixed block, a driving area formed between the partition plate and the valve cover, a main driving device arranged in the driving area and used for driving the two ball valve assemblies to move simultaneously, and a pair of auxiliary driving devices arranged in the driving area and used for driving the two ball valve assemblies to move respectively;

the ball valve assembly comprises a ball body positioned in the valve chamber, a valve rod with one end arranged at the top of the ball body and the other end sequentially penetrating through the valve body and the partition plate, and the top of the valve rod is rotatably arranged on the valve cover;

the main driving device comprises a fixing frame which is arranged at the top of the valve cover and located between the two ball valve assemblies, the fixing frame is of a U-shaped structure, a fixing plate which is arranged at the bottom of the U-shaped frame, a main driving assembly which is arranged on the fixing plate, racks which are arranged on the main driving assembly and move along the X direction, the two racks are opposite in moving direction, and adjusting gears which are arranged on the valve rod and are meshed with the racks are arranged.

Further, the main driving assembly comprises a rotating shaft A rotatably mounted at the top of the fixing frame through a rolling bearing, a rotating shaft B rotatably mounted on the rotating shaft A, a gear A mounted on the rotating shaft A, a worm wheel mounted on the rotating shaft B and positioned above the gear A, a rotating shaft C rotatably mounted on the fixing frame and positioned in front of the worm wheel through a rolling bearing, a worm mounted on the rotating shaft C and engaged with the worm wheel, a first bevel gear mounted on the rotating shaft C, a rotating shaft D rotatably mounted on the fixing frame through a rolling bearing and having the top penetrating through the valve cover, a second bevel gear mounted on the rotating shaft D and engaged with the first bevel gear, a first driving rod rotatably mounted on the rotating shaft A and positioned below the gear A through a rolling bearing, a second driving rod mounted on the rotating shaft B and positioned between the gear A and the worm wheel, the first driving rod and the second driving rod are vertically symmetrical, a rotating shaft E and a rotating shaft F which are respectively positioned at two ends of the first driving rod, the top parts of the rotating shaft E and the rotating shaft F are rotatably arranged on the second driving rod through rolling bearings, the bottom parts of the rotating shaft E and the rotating shaft F are rotatably arranged on the first driving rod through rolling bearings, a gear B which is arranged on the rotating shaft E and is meshed with the gear A, a gear C which is arranged on the rotating shaft F and is meshed with the gear A, a pair of third driving rods and a fourth driving rod, one end of which is hinged with the rotating shaft E and is distributed along the Z direction, a rotating shaft G, two ends of which are respectively rotatably arranged on the third driving rod and the fourth driving rod through rolling bearings, a gear D which is arranged on the rotating shaft G and is meshed with the gear B, a pair of fifth driving rod and a sixth driving rod, one end of which is hinged with the rotating shaft F and is distributed along the Z direction, a rotating shaft H, and a gear E which is arranged on the rotating shaft H and is meshed with the gear C, the translation block A is rotatably installed at the bottom of the rotating shaft G through a rolling bearing and movably installed on the fixing plate, the translation block B is rotatably installed at the bottom of the rotating shaft H through a rolling bearing and movably installed on the fixing plate, and the translation block A and the translation block B are always in bilateral symmetry about the rotating shaft A;

the two racks are respectively arranged at the bottoms of the translation block A and the translation block B.

Further, the gear B and the gear C are always in central symmetry about the rotating shaft A, and the gear D and the gear E are always in left-right symmetry about the rotating shaft A;

the third driving rod and the fifth driving rod are centrosymmetric about the rotating shaft A, and the fourth driving rod and the sixth driving rod are centrosymmetric about the rotating shaft A;

the mechanical parameters of the gear A, the gear B, the gear C, the gear D and the gear E are the same, the lengths of the first driving rod and the second driving rod are L1, the lengths of the third driving rod, the fourth driving rod, the fifth driving rod and the sixth driving rod are L2, and L2 is 0.5L 1.

Furthermore, the bottom of the fixed plate is provided with a sliding chute which is matched with the translation block A and the translation block B in shape; the top of the fixed plate is provided with a through groove for the rotating shaft G and the rotating shaft H to pass through, and the through groove is communicated with the sliding groove.

Further, the auxiliary driving device comprises a first driving gear which is arranged on the valve rod and is positioned above the adjusting gear, an auxiliary shaft A which is rotatably arranged at the top of the valve cover through a rolling bearing, an auxiliary shaft B which is rotatably arranged on the auxiliary shaft A through the rolling bearing, a first belt pulley which is arranged on the auxiliary shaft A, a second belt pulley which is arranged on the auxiliary shaft B and is positioned below the first belt pulley, a second driving gear which is arranged on the auxiliary shaft B and is meshed with the first driving gear, an auxiliary shaft C which is rotatably arranged at the top of the valve cover through the rolling bearing, a third belt pulley which is arranged on the auxiliary shaft C, an annular belt which is in friction transmission with the first belt pulley and the third belt pulley, a stand column which is arranged at the top of the valve cover, a lifting seat which is movably arranged on the stand column, an adjusting rod which is arranged on the stand column through the valve cover and is rotatably arranged through the rolling bearing, and the adjusting rod is in threaded connection with the lifting seat, install both sides and a pair of spacing post along the Z direction distribution around the seat that goes up and down, the endless belt is located two spacing posts all the time, and endless belt and two spacing post butt.

Furthermore, the upright post is provided with a slot matched with the lifting seat in shape, and the lifting seat is inserted into the slot; the lifting seat is provided with a groove body for the adjusting rod to pass through.

Furthermore, an auxiliary handle is arranged on the auxiliary shaft C and is positioned above the valve cover.

Furthermore, a main handle is installed on the rotating shaft D and is positioned above the valve cover.

The invention has the following beneficial effects: the two ball valve assemblies are opened and closed simultaneously through the main driving device, the main driving device drives the translation block A and the translation block B to move in opposite directions, so that the two racks move in opposite directions, the racks are meshed with the adjusting gear to drive the valve rod to rotate, and therefore the two balls rotate simultaneously to open and close. The auxiliary driving device is used for realizing independent opening and closing of the two ball valve assemblies, the lifting seat is driven to move along the Z direction through the adjusting handle, the limiting column drives the annular belt to move between the first belt pulley and the second belt pulley, when the limiting column drives the annular belt to move to the first belt pulley, the annular belt is in friction transmission with the first belt pulley and the third belt pulley, the auxiliary driving device is in a non-working state, and interference between the main driving device and the auxiliary driving device is avoided; when the limiting column drives the annular belt to move to the first belt pulley, the annular belt is in friction transmission with the first belt pulley and the third belt pulley, the auxiliary driving device is in a working state, the auxiliary handle is rotated, the valve rod and the ball body rotate through belt transmission and gear meshing.

Drawings

FIG. 1 is a front cross-sectional view of the present invention;

FIG. 2 is a front view of the main drive assembly of the present invention;

FIG. 3 is a bottom plan view of the primary drive assembly of the present invention;

FIG. 4 is a front view of the secondary drive of the present invention;

FIG. 5 is a schematic view of the third pulley, the first pulley, and the spacing column of the present invention.

In the figure:

1-valve body, 2-channel, 3-valve chamber, 4-ball valve assembly, 5-fixed block, 6-partition plate, 7-valve cover, 8-drive zone, 9-main drive device, 10-auxiliary drive device, 11-ball, 12-valve stem, 13-fixed frame, 14-main drive assembly, 15-rack, 16-adjusting gear, 17-rotating shaft A, 18-rotating shaft B, 20-gear A, 21-worm gear, 22-rotating shaft C, 23-worm, 24-first bevel gear, 25-second bevel gear, 26-first drive rod, 27-second drive rod, 28-rotating shaft E, 29-rotating shaft F, 30-gear B, 31-gear C, 32-third drive rod, 33-a fourth driving rod, 34-a rotating shaft G, 35-a gear D, 36-a fifth driving rod, 37-a sixth driving rod, 38-a rotating shaft H, 39-a gear E, 40-a translation block A, 41-a translation block B, 42-a main handle, 43-a first driving gear, 44-an auxiliary shaft A, 45-an auxiliary shaft B, 46-a first belt pulley, 47-a second belt pulley, 48-a second driving gear, 49-an auxiliary shaft C, 50-a third belt pulley, 51-an annular belt, 52-an upright post, 53-a lifting seat, 54-an adjusting rod, 55-a limiting post, 56-a slot, 57-a groove body, 58-an auxiliary handle, 59-an adjusting handle and 60-a fixing plate.

Detailed Description

The invention is further described with reference to the following drawings and detailed description.

A double-ball valve comprises a valve body 1, wherein a channel 2 which penetrates through the valve body 1 along the X direction is arranged in the valve body 1, a pair of valve chambers 3 which are distributed along the X direction are arranged in the channel 2, ball valve assemblies 4 which are positioned in the valve chambers 3, a fixed block 5 which is arranged at the top of the valve body 1, a partition plate 6 which is arranged on the fixed block 5, a valve cover 7 which is arranged on the fixed block 5, a driving area 8 which is formed between the partition plate 6 and the valve cover 7, a main driving device 9 which is arranged in the driving area 8 and drives the two ball valve assemblies 4 to move simultaneously, and a pair of auxiliary driving devices 10 which are arranged in the driving area 8 and drive the two ball valve assemblies 4 to move respectively;

the ball valve assembly 4 comprises a ball body 11 positioned in the valve chamber 3, a valve rod 12 with one end installed on the top of the ball body 11 and the other end sequentially penetrating through the valve body 1 and the partition plate 6, and the top of the valve rod 12 is rotatably installed on the valve cover 7.

The main driving device 9 comprises a fixing frame 13 which is arranged at the top of the valve cover 7 and is positioned between the two ball valve assemblies 4, the fixing frame 13 is of a U-shaped structure, a fixing plate 60 which is arranged at the bottom of the U-shaped frame, a main driving assembly 14 which is arranged on the fixing plate 60, a rack 15 which is arranged on the main driving assembly 14 and moves along the X direction, the moving directions of the two racks 15 are opposite, and an adjusting gear 16 which is arranged on the valve rod 12 and is meshed with the rack 15.

The main driving assembly 14 comprises a rotating shaft A17 rotatably mounted on the top of the fixed frame 13 through a rolling bearing, a rotating shaft B18 rotatably mounted on the rotating shaft A17, a gear A20 mounted on the rotating shaft A17, a worm wheel 21 mounted on the rotating shaft B18 and positioned above the gear A20, a rotating shaft C22 rotatably mounted on the fixed frame 13 and positioned in front of the worm wheel 21 through the rolling bearing, a worm 23 mounted on the rotating shaft C22 and engaged with the worm wheel 21, a first bevel gear 24 mounted on the rotating shaft C22, a rotating shaft D rotatably mounted on the fixed frame 13 through the rolling bearing and having its top penetrating through the valve cover 7, a second bevel gear 25 mounted on the rotating shaft D and engaged with the first bevel gear 24, a first driving rod 26 rotatably mounted on the rotating shaft A17 and positioned below the gear A20 through the rolling bearing, a second driving rod 27 mounted on the rotating shaft B18 and positioned between the gear A20 and the worm wheel 21, wherein the first driving rod 26 and the second driving rod 27 are vertically symmetrical, a rotating shaft E28 and a rotating shaft F29 respectively positioned at two ends of the first driving rod 26, a rotating shaft E28 and a rotating shaft F29, the tops of which are rotatably mounted on the second driving rod 27 through rolling bearings and the bottoms of which are rotatably mounted on the first driving rod 26 through rolling bearings, a gear B30 which is mounted on the rotating shaft E28 and is meshed with the gear A20, a gear C31 which is mounted on the rotating shaft F29 and is meshed with the gear A20, a pair of third driving rods 32 and fourth driving rods 33 which are hinged with the rotating shaft E28 and distributed along the Z direction, a rotating shaft G34 which is mounted on the third driving rod 32 and fourth driving rod 33 through rolling bearings at two ends respectively, a gear D35 which is mounted on the rotating shaft G34 and is meshed with the gear B30, a pair of fifth driving rod 36 and a sixth driving rod 37 which are hinged with the rotating shaft F29 and distributed along the Z direction at one end, a rotating shaft H38 which is rotatably mounted on the fifth driving rod 36 and the sixth driving rod 37 at two ends respectively through rolling bearings, a gear E39 which is installed on the rotating shaft H38 and is meshed with the gear C31, a translation block A40 which is rotatably installed at the bottom of the rotating shaft G34 through a rolling bearing and is movably installed on the fixing plate 60, and a translation block B41 which is rotatably installed at the bottom of the rotating shaft H38 through a rolling bearing and is movably installed on the fixing plate 60, wherein the translation block A40 and the translation block B41 are always in bilateral symmetry about a rotating shaft A17;

the two racks 15 are respectively installed at the bottoms of the translation block A40 and the translation block B41.

Gear a20, gear B30, gear C31, gear D35 and gear E39 all have the same mechanical parameters, first drive rod 26 and second drive rod 27 are all L1 in length, third drive rod 32, fourth drive rod 33, fifth drive rod 36 and sixth drive rod 37 are all L2 in length, and L2 is 0.5L 1. The gear B30 and the gear C31 are always in central symmetry with respect to the rotating shaft A17, and the gear D35 and the gear E39 are always in left-right symmetry with respect to the rotating shaft A17. The third driving lever 32 and the fifth driving lever 36 are symmetrical with respect to the rotation axis a17, and the fourth driving lever 33 and the sixth driving lever 37 are symmetrical with respect to the rotation axis a 17. The bottom of the fixed plate 60 is provided with a sliding chute which is matched with the translation block A40 and the translation block B41 in shape; the top of the fixing plate 60 is provided with a through groove for the rotating shaft G34 and the rotating shaft H38 to pass through, and the through groove is communicated with the through groove.

The rotating shaft D is provided with a main handle 42, and the main handle 42 is positioned above the valve cover 7.

The two ball valve assemblies 4 are opened and closed simultaneously through the main driving device 9, the main driving assembly 14 is used for driving the translation block A40 and the translation block B41 to move in opposite directions, the moving directions of the two racks 15 are opposite, the racks 15 are meshed with the adjusting gear 16, the valve rod 12 is driven to rotate, and therefore the two spheres 11 rotate simultaneously to open or close the channel 2. By rotating the main handle 42, the first bevel gear 24 is engaged with the second bevel gear 25, the worm wheel 21 and the worm 23 are driven, the rotating shaft B18 rotates, the first driving rod 26 and the second driving rod 27 rotate along with the rotating shaft a17, the gear B30 and the gear C31 rotate around the central axis of the rotating shaft B18, the gear B30 is engaged with the gear a20 to drive the gear a20 to rotate, the gear B30 and the gear C31 rotate, the rotating shaft E28 and the rotating shaft F29 rotate to drive the third driving rod 32, the fourth driving rod 33, the fifth driving rod 36 and the sixth driving rod 37 to move, the gear D35 is engaged with the gear B30, the gear E39 is engaged with the gear C31, the translation block a40 and the translation block B41 move along the X direction, the rack 15 is engaged with the adjusting gear 16, and the valve rod 12 rotates.

The sub-drive device 10 includes a first drive gear 43 mounted on the valve stem 12 above the adjustment gear 16, a sub-shaft a44 rotatably mounted on the top of the valve cover 7 by a rolling bearing, a sub-shaft B45 rotatably mounted on the sub-shaft a44 by a rolling bearing, a first pulley 46 mounted on the sub-shaft a44, a second pulley 47 mounted on the sub-shaft B45 below the first pulley 46, a second drive gear 48 mounted on the sub-shaft B45 and engaged with the first drive gear 43, a sub-shaft C49 rotatably mounted on the top of the valve cover 7 by a rolling bearing, a third pulley 50 mounted on the sub-shaft C49, an endless belt 51 frictionally driven with the first pulley 46 and the third pulley 50, a column 52 mounted on the top of the valve cover 7, a lifting seat 53 movably mounted on the column 52, an adjustment lever 54 passing through the valve cover 7 and rotatably mounted on the column 52 by a rolling bearing, the adjusting rod 54 is in threaded connection with the lifting seat 53, is mounted on the front side and the rear side of the lifting seat 53 and is provided with a pair of limiting columns 55 distributed along the Z direction, the annular belt 51 is always located on the two limiting columns 55, and the annular belt 51 is abutted to the two limiting columns 55.

The upright column 52 is provided with a slot 56 which is matched with the lifting seat 53 in shape, and the lifting seat 53 is inserted into the slot 56; the lifting seat 53 is provided with a groove 57 for the adjusting rod 54 to pass through.

The auxiliary shaft C49 is provided with an auxiliary handle 58, and the auxiliary handle 58 is positioned above the valve cover 7. The adjusting rod 54 is provided with an adjusting handle 59, and the adjusting handle 59 is positioned above the valve cover 7.

The auxiliary driving device 10 realizes the independent opening and closing of the two ball valve assemblies 4. The lifting seat 53 is driven to move along the Z direction by the adjusting handle 59, the limit column 55 drives the annular belt 51 to move between the first belt pulley 46 and the second belt pulley 47, when the limit column 55 drives the annular belt 51 to move to the first belt pulley 46, the annular belt 51 simultaneously performs friction transmission with the first belt pulley 46 and the third belt pulley 50, and at the moment, the auxiliary driving device 10 is in a non-working state, so that the interference between the main driving device 9 and the auxiliary driving device 10 is avoided; when the limiting column 55 drives the endless belt 51 to move to the first belt pulley 46, the endless belt 51 simultaneously performs friction transmission with the first belt pulley 46 and the third belt pulley 50, at this time, the auxiliary driving device 10 is in a working state, the auxiliary handle 58 is rotated, the second belt pulley 47 rotates through belt transmission, the first driving gear 43 is meshed with the second driving gear 48, the valve rod 12 rotates, and the ball body 11 rotates to realize opening and closing.

The working principle of the invention is as follows:

s1: when two ball valve assemblies 4 need to be opened and closed simultaneously, the auxiliary driving device 10 is in a non-working state; then, the main handle 42 is rotated to drive the two racks 15 to move along the X direction, the moving directions are opposite, the racks 15 are close to the adjusting gear 16, then the racks 15 are meshed with the adjusting gear 16, the valve rod 12 rotates, and the ball 11 rotates;

s2: when the two ball valve assemblies 4 need to be opened and closed independently, the main handle 42 is rotated, the main driving device 9 is restored to the initial state, and the rack 15 is far away from the adjusting gear 16; then, the adjustment handle 59 is rotated to make the auxiliary driving device 10 in the working state; then, the sub-handle 58 is rotated, the third pulley 50 and the first pulley 46 are rotated, the second driving gear 48 is engaged with the first driving gear 43, the valve stem 12 is rotated, and the ball 11 is rotated.

Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.

Claims

1. A double-ball valve is characterized by comprising a valve body (1), a channel (2) which is arranged in the valve body (1) in a penetrating mode along the X direction is arranged in the channel (2), a pair of valve chambers (3) which are distributed along the X direction are arranged in the channel (2), ball valve assemblies (4) which are located in the valve chambers (3), a fixed block (5) which is installed at the top of the valve body (1), a partition plate (6) which is installed on the fixed block (5), a valve cover (7) which is installed on the fixed block (5), a driving area (8) which is formed between the partition plate (6) and the valve cover (7), a main driving device (9) which is installed in the driving area (8) and drives the two ball valve assemblies (4) to move simultaneously, and a pair of auxiliary driving devices (10) which are installed in the driving area (8) and drive the two ball valve assemblies (4) to move respectively;

the ball valve assembly (4) comprises a ball body (11) positioned in the valve chamber (3), a valve rod (12) with one end installed at the top of the ball body (11) and the other end sequentially penetrating through the valve body (1) and the partition plate (6), and the top of the valve rod (12) is rotatably installed on the valve cover (7);

the main driving device (9) comprises a fixing frame (13) which is arranged at the top of a valve cover (7) and located between two ball valve assemblies (4), the fixing frame (13) is of a U-shaped structure, a fixing plate (60) which is arranged at the bottom of the U-shaped frame, a main driving assembly (14) which is arranged on the fixing plate (60), racks (15) which are arranged on the main driving assembly (14) and move along the X direction, the moving directions of the two racks (15) are opposite, and adjusting gears (16) which are arranged on a valve rod (12) and are meshed with the racks (15) are arranged.

2. The double ball valve according to claim 1, wherein the main driving assembly (14) comprises a rotating shaft A (17) rotatably mounted on the top of the fixing frame (13) through a rolling bearing, a rotating shaft B (18) rotatably mounted on the rotating shaft A (17), a gear A (20) mounted on the rotating shaft A (17), a worm wheel (21) mounted on the rotating shaft B (18) and located above the gear A (20), a rotating shaft C (22) rotatably mounted on the fixing frame (13) and located in front of the worm wheel (21) through a rolling bearing, a worm (23) mounted on the rotating shaft C (22) and engaged with the worm wheel (21), a first bevel gear (24) mounted on the rotating shaft C (22), a rotating shaft D rotatably mounted on the fixing frame (13) through a rolling bearing and having a top penetrating through the valve cover (7), a second bevel gear (25) mounted on the rotating shaft D and engaged with the first bevel gear (24), install first actuating lever (26) on pivot A (17) and be located gear A (20) below through antifriction bearing rotation, install on pivot B (18) and be located second actuating lever (27) between gear A (20) and worm wheel (21), first actuating lever (26) and second actuating lever (27) longitudinal symmetry, be located pivot E (28) at first actuating lever (26) both ends respectively, pivot F (29), pivot E (28), the top of pivot F (29) is installed on second actuating lever (27) through antifriction bearing rotation and the bottom is installed on first actuating lever (26) through antifriction bearing rotation, install on pivot E (28) and with gear A (20) meshed gear B (30), install on pivot F (29) and with gear A (20) meshed gear C (31), a pair of third actuating lever (32) that one end and pivot E (28) articulated and distribute along the Z direction, A fourth driving rod (33), a rotating shaft G (34) with two ends respectively rotatably installed on the third driving rod (32) and the fourth driving rod (33) through rolling bearings, a gear D (35) installed on the rotating shaft G (34) and engaged with the gear B (30), a pair of fifth driving rod (36) and a sixth driving rod (37) with one ends hinged with the rotating shaft F (29) and distributed along the Z direction, a rotating shaft H (38) with two ends respectively rotatably installed on the fifth driving rod (36) and the sixth driving rod (37) through rolling bearings, a gear E (39) installed on the rotating shaft H (38) and engaged with the gear C (31), a translation block A (40) rotatably installed at the bottom of the rotating shaft G (34) and movably installed on the fixing plate (60) through rolling bearings, and a translation block B (41) rotatably installed at the bottom of the rotating shaft H (38) and movably installed on the fixing plate (60) through rolling bearings, the translation block A (40) and the translation block B (41) are always in bilateral symmetry about the rotating shaft A (17);

the two racks (15) are respectively arranged at the bottoms of the translation block A (40) and the translation block B (41).

3. A double ball valve according to claim 2, wherein the gear B (30) and the gear C (31) are always centrosymmetric about the rotation axis a (17), and the gear D (35) and the gear E (39) are always bilaterally symmetric about the rotation axis a (17);

the third driving rod (32) and the fifth driving rod (36) are centrosymmetric about the rotating shaft A (17), and the fourth driving rod (33) and the sixth driving rod (37) are centrosymmetric about the rotating shaft A (17);

the mechanical parameters of the gear A (20), the gear B (30), the gear C (31), the gear D (35) and the gear E (39) are the same, the lengths of the first driving rod (26) and the second driving rod (27) are L1, the lengths of the third driving rod (32), the fourth driving rod (33), the fifth driving rod (36) and the sixth driving rod (37) are L2, and L2 is equal to 0.5L 1.

4. A double ball valve according to claim 2 or 3, characterized in that the bottom of the fixed plate (60) is provided with a sliding groove which is matched with the translation blocks a (40) and B (41) in shape; the top of the fixing plate (60) is provided with a through groove for the rotating shaft G (34) and the rotating shaft H (38) to pass through, and the through groove is communicated with the sliding groove.

5. A double ball valve according to claim 1, characterised in that the secondary drive means (10) comprise a first driving gear (43) mounted on the valve stem (12) and above the regulating gear (16), a secondary shaft a (44) mounted on top of the valve cover (7) by means of a rolling bearing, a secondary shaft B (45) mounted on the secondary shaft a (44) by means of a rolling bearing, a first pulley (46) mounted on the secondary shaft a (44), a second pulley (47) mounted on the secondary shaft B (45) and below the first pulley (46), a second driving gear (48) mounted on the secondary shaft B (45) and meshing with the first driving gear (43), a secondary shaft C (49) mounted on top of the valve cover (7) by means of a rolling bearing, a third pulley (50) mounted on the secondary shaft C (49), a third pulley (46) mounted with the first pulley (46), Third belt pulley (50) friction drive's endless belt (51), install stand (52) at valve gap (7) top, install lift seat (53) on stand (52) with moving, pass valve gap (7) and rotate regulation pole (54) of installing on stand (52) through antifriction bearing, adjust pole (54) and lift seat (53) threaded connection, install a pair of spacing post (55) of just following the Z direction distribution in lift seat (53) front and back both sides, endless belt (51) are located two spacing posts (55) all the time, and endless belt (51) and two spacing post (55) butt.

6. A double ball valve according to claim 5, characterized in that the upright (52) is provided with a slot (56) which is matched with the lifting seat (53) in shape, and the lifting seat (53) is inserted into the slot (56); the lifting seat (53) is provided with a groove body (57) for the adjusting rod (54) to pass through.

7. A double ball valve according to claim 5, characterized in that an auxiliary handle (58) is mounted on the auxiliary shaft C (49), the auxiliary handle (58) being located above the valve cover (7).

8. A double ball valve according to claim 2, characterized in that the spindle D is provided with a main handle (42), the main handle (42) being located above the valve cover (7).