CN210739417U

CN210739417U - Novel gate valve

Info

Publication number: CN210739417U
Application number: CN201921298591.XU
Authority: CN
Inventors: 姜亚平; 李建红; 王晓凯
Original assignee: SHITE VALVE CO Ltd
Current assignee: SHITE VALVE CO Ltd
Priority date: 2019-08-12
Filing date: 2019-08-12
Publication date: 2020-06-12
Anticipated expiration: 2029-08-12

Abstract

The utility model relates to a novel gate valve. The valve comprises a main valve body, an auxiliary valve body, a valve plate assembly, a driving device and a transmission mechanism assembly, wherein the main valve body and the auxiliary valve body are of box body type structures, and the main valve body is positioned right below the auxiliary valve body; the valve plate assembly comprises a frame, a blind plate piece, a connecting rod mechanism and a spring mechanism, the driving device is installed on the outer surface of one side of the upper portion of the auxiliary valve body, and two closed-loop chain transmissions are formed between the transmission mechanism assembly and the valve plate assembly. The utility model discloses a link mechanism and the spring mechanism that set up on the valve plate subassembly, can be at the vertical back horizontal migration that targets in place of downward operation of the blind plate spare of valve plate subassembly, make the blind plate spare closely laminate sealedly at the disk seat of the horizontal direction with the main valve body, when the valve is opened, the blind plate spare of valve plate subassembly makes horizontal migration earlier and breaks away from with the disk seat of the main valve body, do vertical upward movement again and open until the valve plate subassembly and target in place, a drive arrangement can realize the vertical reciprocating motion of valve plate subassembly and the horizontal migration of blind plate spare promptly.

Description

Novel gate valve

Technical Field

The utility model relates to a novel push-pull valve especially is used for metallurgical industry, chemical industry or vacuum simulation experiment system, realizes valve plate subassembly up-and-down motion and horizontal motion's push-pull valve through a drive arrangement.

Background

The gate valve that metallurgical industry used at present generally sets up two drive arrangement, and a drive arrangement drives the valve plate and realizes the switching of through-hole and blind plate, and another drive arrangement realizes laminating or breaking away from of valve plate and disk seat. Compared with the arrangement of one driving device, the two driving devices not only increase the manufacturing cost, but also increase the complexity of the opening and closing control of the valve, and easily cause the operation accidents of the valve.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an invention aim at provides a novel push-pull valve, it has overcome prior art traditional push-pull valve and has set up the not enough of two drive arrangement, the utility model discloses reduce production manufacturing cost, simplified valve operation control procedure, the valve is opened and close the operation simpler, more reliable.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a novel gate valve, its includes the main valve body (1), with the vertical vice valve body (2) that is connected of the main valve body (1), the main valve body (1) is located vice valve body (2) under, its characterized in that: a driving device (3) is arranged on one side of the upper end outside the auxiliary valve body (2), a transmission mechanism component connected with the driving device (3) is arranged inside the auxiliary valve body (2), a valve plate component (10) connected with the transmission mechanism component is arranged in a shell formed by the main valve body (1) and the auxiliary valve body (2), the main valve body (1) and the auxiliary valve body (2) are both box-type structures, the upper and lower butt joint parts of the auxiliary valve body (2) and the main valve body (1) are provided with openings as passages for the valve plate assembly (10) to run up and down, the front end and the rear end of the main valve body (1) are respectively provided with an end flange (28), the end flanges (28) are respectively connected with a front panel (29) and a rear panel (30) of the main valve body (1) through cylinders, a circular valve seat (31) concentric with the end flange (28) is arranged on the inner side of the rear panel (30), and the sealing surface of the valve seat (31) is parallel to the up-and-down running plane of the valve plate assembly (10);

the valve plate assembly (10) comprises a frame (11), a spring mechanism (12), a connecting rod mechanism (13) and a blind plate piece (14);

the frame (11) comprises a left vertical frame, a right vertical frame, an upper transverse frame and a lower transverse frame, diagonal corner section steel is arranged at four corners between the vertical frame and the transverse frame, chain joints (15) in transmission connection with the transmission mechanism assembly are respectively arranged at the left side and the right side of the upper part of the frame (11), and the vertical frames at the left side and the right side of the frame (11) are used as vertical guide rails (16);

the number of the spring mechanisms (12) is 4, the spring mechanisms are uniformly arranged around a round blind plate piece (14), each spring mechanism (12) comprises a left spring seat (24), a pressure spring (25) and a right spring seat (26), the left spring seats (24) are fixedly connected with a frame (11), the right spring seats (26) are fixedly connected with a pressure plate base (20) arranged on the blind plate piece (14) through pressure plates (27), the arrangement positions of 4 groups of pressure plate bases (20) correspond to the positions of 4 spring mechanisms (12) arranged on a valve plate assembly (10), the central line of the pressure spring (25) and the horizontal plane form a certain acute angle in the opening state of the valve, and the size of the acute angle is determined by the horizontal design size of the centers of two hinge points of the left spring seat and the right spring seat of the spring mechanism (12) and the vertical distance of the centers of the two hinge points of the left spring seat;

the number of the connecting rod mechanisms (13) is 8, two of the connecting rod mechanisms are uniformly arranged between the adjacent spring mechanisms (12) in a group, each connecting rod mechanism (13) comprises a left connecting rod base (21), a connecting rod (22) and a right connecting rod base (23), the left connecting rod base (21) is fixedly connected with the blind plate piece (14), the right connecting rod base (23) is fixedly connected with the frame (11) through a steel plate, the central connecting line of two hinged holes of each connecting rod (22) forms a certain acute angle with the horizontal plane in the closing and opening states of the valve, the acute angle in the opening state is larger than that in the closing state, and when the vertical downward acting force of the frame (11) on the connecting rods (22) is a certain value in the closing state of the valve, the size of the acute angle is determined by the size of the component force required by the connecting rods (22) in;

a limiting block (17) is arranged on the frame (11), a limiting rod (18) is arranged on the blind plate piece (14), the arrangement position of the limiting rod (18) corresponds to that of the limiting block (17), the limiting block (17) and the limiting rod (18) are attached and limited in the vertical direction in the opening state of the valve, and a top rod (19) is arranged at the lower part of the blind plate piece (14);

eight sets of guide wheel assemblies (9) are arranged in a box inner cavity formed by the main valve body (1) and the auxiliary valve body (2), the guide wheel assemblies (9) are vertically arranged in two rows, the horizontal distance between the two rows of guide wheel assemblies (9) is equal to the horizontal distance between guide rails (16) on the frame (11), the guide wheel assemblies (9) are respectively arranged in two rows on the main valve body (1) and the auxiliary valve body (2), the horizontal arrangement position of the four rows of guide wheel assemblies (9) meets the contact positioning requirement of at least two different rows of guide wheel assemblies (9) on the guide rails (16) on the frame (11) when the valve plate assembly (10) is at any operation position, each set of guide wheel assembly (9) comprises two guide wheels, and the horizontal positioning distance between the two guide wheels is equal to the structural outer surface distance of the guide rails (16) on the frame (11).

Furthermore, the transmission mechanism component of the utility model comprises a bearing seat (4), a transmission shaft (5), a driving sprocket (6), a chain (7) and a driven sprocket (8); two ends of a transmission shaft (5) are respectively symmetrically provided with a bearing seat (4) and a driving sprocket (6), the bearing seats (4) are installed on a cross beam arranged in an inner cavity of an auxiliary valve body (2), one end of the transmission shaft (5) is connected with an output end of a driving device (3), two side edges of the lower end part of the inner cavity of the auxiliary valve body (2) are respectively symmetrically provided with a driven sprocket (8), and a chain (7) is assembled on the driving sprocket (6) and the driven sprocket (8);

the left side and the right side of the upper part of the frame (11) are respectively provided with a connecting part which is in transmission connection with the transmission mechanism assembly and is a chain joint (15), and the chain joint (15) is connected with a chain (7) of the transmission mechanism assembly.

The transmission mechanism assembly comprises a bearing seat (4), a transmission shaft (5), a driving chain wheel (6), a chain (7) and a driven chain wheel (8), wherein the two ends of the transmission shaft (5) are symmetrically provided with the bearing seat (4) and the driving chain wheel (6) respectively, the bearing seat (4) is installed on a cross beam arranged in an inner cavity of the auxiliary valve body (2), one end of the transmission shaft (5) is connected with the output end of the driving device (3), two side edges of the end part of the inner cavity of the auxiliary valve body (2) are symmetrically provided with the driven chain wheel (8) respectively, the chain (7) is assembled on the driving chain wheel (6) and the driven chain wheel (8), the chain (7) is connected with a chain joint (15) of the valve plate assembly (10), and two closed-loop chain transmissions are.

The utility model discloses a theory of operation and process are: the driving device (3) drives the transmission shaft (5) of the transmission mechanism component and the driving sprocket (6) to synchronously rotate, the chain (7) meshed with the driving sprocket (6) drives the driven sprocket (8) to synchronously rotate, and the chain (7) drives the valve plate component (10) to synchronously move up and down in a reciprocating manner through the chain joint (15) arranged on the valve plate component (10); the guide wheels of at least two sets of guide wheel assemblies (9) on each guide rail (16) are clamped on the outer surface of the structure of the guide rail (16) to ensure the vertical running track of the frame (11).

When the valve is in an opening state, a limiting block (17) arranged on a frame (11) of the valve plate assembly (10) and a limiting rod (18) arranged on the blind plate piece (14) are attached and limited in the vertical direction. When the closing operation process of the valve is executed, the driving device (3) drives the transmission mechanism assembly and drives the valve plate assembly (10) to move vertically and downwards, after the valve plate assembly (10) moves downwards to a proper position, the ejector rod (19) arranged at the lower part of the blind plate (14) abuts against the inner surface of the bottom plate of the main valve body (1) to cause the blind plate (14) to stop moving downwards, under the continuous vertical and downward action of the driving device (3) on the frame (11), the frame (11) drives the connecting rod (22) of the connecting rod mechanism (13) to tend to move horizontally, the connecting rod (22) pushes the blind plate (14) to move horizontally towards the direction of the valve seat and cling to the valve seat through the left connecting rod base (21), and finally the valve is closed to the proper position; meanwhile, a limiting block (17) arranged on a frame (11) of the valve plate assembly (10) is separated from a limiting rod (18) arranged on a blind plate piece (14) in the vertical direction, in the process that the blind plate piece (14) stops moving downwards and the frame (11) continues to move downwards, the blind plate piece (14) moves horizontally towards the valve seat direction to drive a pressing plate (27) fixedly connected with a pressing plate base (20) to move horizontally towards the valve seat direction synchronously until the valve is closed in place, meanwhile, a pressure spring (25) of a spring mechanism (12) is compressed, and the central line of the pressure spring (25) tends to the horizontal position.

When the opening operation process of the valve is executed, the driving device (3) drives the transmission mechanism assembly and drives the valve plate assembly (10) to move vertically upwards, when the frame (11) moves vertically upwards, the compression spring (25) of the spring mechanism (12) releases compression potential energy to push the blind plate (14) to move horizontally towards the opposite direction of the valve seat and separate from the valve seat, the stroke of the blind plate (14) moving horizontally towards the opposite direction of the valve seat is controlled by the vertical distance between the limiting block (17) arranged on the frame (11) and the limiting rod (18) arranged on the blind plate (14), and when the limiting block (17) and the limiting rod (18) are attached in the vertical direction for limiting, the blind plate (14) moves horizontally in place and moves vertically upwards synchronously along with the frame (11) until the valve is opened in place.

The utility model adopts the above scheme beneficial effect who produces does:

the utility model discloses a link mechanism and the spring mechanism that set up on the valve plate subassembly adopt a drive arrangement alright realize the up-and-down motion of valve plate subassembly and the horizontal migration of blind plate spare, have reduced drive arrangement's purchase or manufacturing cost, have simplified drive arrangement's operation control procedure, and the valve is opened and close the operation simpler, more reliable.

The utility model discloses a novel gate valve, at the valve plate subassembly laminating or the in-process that breaks away from the disk seat, the valve plate subassembly only makes the motion of vertical direction for the sealed face of disk seat, has avoided rubber seal's slant friction and scraping to the scissors in sealed vice, has prolonged rubber seal's life greatly.

The utility model discloses a novel push-pull valve, valve plate subassembly adopt a blind plate spare to replace the blind plate that traditional technique push-pull valve set up with the spectacle-frame structure of expert's board, have reduced the manufacturing cost of product.

Drawings

Fig. 1 is a schematic structural view of an embodiment of the novel gate valve of the present invention.

Fig. 2 is the structure schematic diagram of the valve plate assembly in the open state according to the embodiment of the novel gate valve of the present invention.

Fig. 3 is a schematic structural diagram of a frame in a valve plate assembly according to an embodiment of the novel gate valve of the present invention.

Fig. 4 is a schematic structural diagram of a blind plate member in a valve plate assembly according to an embodiment of the novel gate valve of the present invention.

Fig. 5 is a sectional view of the present invention from fig. 4A-a.

Fig. 6 is a cross-sectional view of the present invention from fig. 2B-B.

Fig. 7 is a cross-sectional view of the present invention taken along the line of fig. 2C-C.

Fig. 8 is a schematic structural view of a valve plate assembly in a closed state according to an embodiment of the novel gate valve of the present invention.

Fig. 9 is a cross-sectional view of the present invention in the direction of fig. 8D-D.

Fig. 10 is a cross-sectional view of the present invention taken along the line of fig. 8E-E.

Fig. 11 is a cross-sectional view of the present invention in fig. 1F-F.

In the figure: 1. a main valve body; 2. a sub-valve body; 3. a drive device; 4. a bearing seat; 5. a drive shaft; 6. a drive sprocket; 7. a chain; 8. a driven sprocket; 9. a guide wheel assembly; 10. a valve plate assembly; 11. a frame; 12. a spring mechanism; 13. a link mechanism; 14. a blind plate member; 15. a chain joint; 16. a guide rail; 17. a limiting block; 18. a limiting rod; 19. a top rod; 20. a platen base; 21. a left connecting rod base; 22. a connecting rod; 23. a right link base; 24. a left spring seat; 25. a pressure spring; 26. a right spring seat; 27. pressing a plate; 28. an end flange; 29. a front panel; 30. a rear panel; 31. a valve seat; 32. the base is convex.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings:

as shown in fig. 1, 2, 3, 11, the novel gate valve of the embodiment of the present invention includes a main valve body 1, an auxiliary valve body 2 vertically connected to the main valve body 1, the main valve body 1 is located under the auxiliary valve body 2, a driving device 3 is disposed on one side of the upper end outside the auxiliary valve body 2, a transmission mechanism assembly connected to the driving device 3 is disposed inside the auxiliary valve body 2, the transmission mechanism assembly includes a bearing seat 4, a transmission shaft 5, a driving sprocket 6, a chain 7, and a driven sprocket 8, two ends of the transmission shaft 5 are respectively symmetrically provided with a bearing seat 4 and a driving sprocket 6, the bearing seat 4 is mounted on a cross beam disposed in the inner cavity of the auxiliary valve body 2, one end of the transmission shaft 5 is connected to the output end of the driving device 3, two side edges of the end in the inner cavity of the auxiliary valve body 2 are respectively symmetrically provided with a; a valve plate assembly 10 is arranged in a shell formed by a main valve body 1 and an auxiliary valve body 2, the valve plate assembly 10 comprises a frame 11, a spring mechanism 12, a connecting rod mechanism 13 and a blind plate member 14, the frame 11 comprises a left vertical frame, a right vertical frame, an upper transverse frame and a lower transverse frame, diagonal corner section steel is arranged at four corners between the vertical frame and the transverse frame, chain joints 15 are respectively arranged at the left side and the right side of the upper part of the frame 11 and connected with a chain 7 of a transmission mechanism assembly, and the vertical frames at the left side and the right side of the frame 11 are used as vertical guide rails (16); the main valve body 1 and the auxiliary valve body 2 are both box-type structures, the upper and lower butt joint part of the auxiliary valve body 2 and the main valve body 1 is provided with an opening as a channel for the valve plate assembly 10 to move up and down, the front end and the rear end of the main valve body 1 are respectively provided with an end flange 28, the end flanges 28 are respectively connected with a front panel 29 and a rear panel 30 of the main valve body 1 through cylinders, the inner side of the rear panel 30 is provided with a circular valve seat 31 concentric with the end flange 28, the sealing surface of the valve seat 31 is parallel to the upper and lower moving planes of the valve plate assembly 10, eight sets of guide wheel assemblies 9 are arranged in a box inner cavity formed by the main valve body 1 and the auxiliary valve body 2, the guide wheel assemblies 9 are vertically arranged in two rows, the horizontal distance between the two rows of guide wheel assemblies 9 is equal to the horizontal distance between the guide rails 16 on the frame 11, the guide wheel assemblies 9 are respectively provided with two rows and four rows on the main valve body The contact positioning of the members 9 on the guide rails 16 of the frame 11 requires that each set of guide wheel assemblies 9 comprises two guide wheels, the horizontal positioning distance between the two guide wheels being equal to the structural outer surface distance of the guide rails 16 of the frame 11.

As shown in fig. 2, 3, 4, 5, 6, and 7, the valve plate assembly 10 is in an open state. The number of the spring mechanisms 12 on the valve plate assembly 10 is 4, the spring mechanisms 12 are uniformly arranged around the round blind plate member 14, each spring mechanism 12 comprises a left spring seat 24 and a pressure spring 25, the left spring seat 24 and the right spring seat 26 are respectively provided with a guide pin shaft and a guide pin hole along the central line of the pressure spring 25 so as to meet the requirement of the compression amount of the pressure spring 25, the left spring seat 24 is fixedly connected with the frame 11, the right spring seat 26 is fixedly connected with a pressure plate base 20 arranged on the blind plate piece 14 through a pressure plate 27, the arrangement positions of 4 groups of pressure plate bases 20 correspond to the positions of 4 spring mechanisms 12 arranged on the valve plate assembly 10, the central line of the pressure spring 25 and the horizontal plane form a certain acute angle (the size of the acute angle is determined by the horizontal design size of the centers of two hinged points of the left spring seat and the right spring seat of the spring mechanism (12) and the vertical distance of the centers of the two hinged points of the left spring seat and the right spring seat), and the vertical distance of the centers; the number of the connecting rod mechanisms 13 on the valve plate assembly 10 is 8, two of the connecting rod mechanisms are a group and are uniformly arranged between the adjacent spring mechanisms 12, each connecting rod mechanism 13 comprises a left connecting rod base 21, a connecting rod 22 and a right connecting rod base 23, the left connecting rod base 21 is fixedly connected with a base bulge 32 on the blind plate piece 14 (if the base bulge 32 is not arranged on the blind plate piece 14, the outer diameter size of a sealing ring plate at the left end of the blind plate piece 14 can be increased so as to meet the structural requirement of fixed connection with the left connecting rod base 21), the right connecting rod base 23 is fixedly connected with the frame 11 through a steel plate, a connecting line of the centers of two hinged holes of the connecting rod 22 forms a certain acute angle with the horizontal plane, the horizontal distance of the centers of the two hinged holes of the connecting rod 22 is H1, and the vertical distance; a limiting block (17) is arranged on the frame (11), a limiting rod (18) is arranged on the blind plate piece (14), the arrangement position of the limiting rod (18) corresponds to the limiting block (17), and the limiting block (17) and the limiting rod (18) are attached in the vertical direction for limiting; the lower part of the blind plate part (14) is provided with a mandril (19).

As shown in fig. 8, 9 and 10, the valve plate assembly 10 is in a closed state. The spacing between a limiting block 17 arranged on the frame 11 and a limiting rod 18 arranged on the blind plate part 14 in the vertical direction is V; the horizontal distance between the centers of the two hinged holes of the connecting rod 22 of the link mechanism 13 is H2, the vertical distance between the centers of the two hinged holes of the connecting rod 22 is V2, and V2-V1 is equal to V; the center line of a compression spring 25 of the spring mechanism 12 is in a horizontal state, and the vertical distance between the centers of two hinged points of a left spring seat 24 and a right spring seat 26 is 0; namely, when the valve is in a closed position, the frame 11 moves downwards by a distance V in the vertical direction relative to the blind plate member 14, the translation distance of the blind plate member 14 relative to the frame 11 in the horizontal direction towards the direction of the valve seat 31 of the main valve body 1 is H2-H1, the horizontal distance from the left side sealing surface of the blind plate member 14 to the sealing surface of the valve seat is designed to be H2-H1 when the given valve plate assembly 10 runs up and down, and after the valve is closed to a certain position, the distance from the left side sealing surface of the blind plate member 14 to the direction of the valve seat 31 of the main valve body 1 is H2-H1, so that the left side sealing surface of the blind; when the valve plate assembly 10 is in the closed state, the connecting line of the centers of the two hinged holes of the connecting rod 22 on the connecting rod mechanism 13 still forms a certain acute angle (when the vertical downward force of the frame 11 on the connecting rod 22 is a certain value, the size of the acute angle is determined by the size of the component force required by the connecting rod 22 in the horizontal direction), and the acute angle is generally larger than 0 degrees and smaller than or equal to 45 degrees, and can be larger than 45 degrees in special cases.

The utility model discloses a novel push-pull valve's working process does: taking the valve in the open state as an example, the frame 11 of the valve plate assembly 10 moves up and down in the space defined by the guide wheel assembly 9 and cannot move in the horizontal direction, and the left sealing surface of the blind plate member 14 of the valve plate assembly 10 keeps a certain distance from the sealing surface of the valve seat 31 of the main valve body 1, so that the rubber sealing ring on the blind plate member 14 is not scratched when the valve plate assembly 10 moves up and down in the opening and closing process. Starting a motor of a driving device 3, the driving device 3 drives a transmission shaft 5 and a driving sprocket 6 of a transmission mechanism assembly to synchronously rotate, a chain 7 meshed with the driving sprocket 6 and a driven sprocket 8 is connected with a chain joint 15 of a valve plate assembly 10 to drive the valve plate assembly 10 to vertically move downwards, when two ejector rods 19 arranged at the lower part of a blind plate 14 abut against the inner surface of a bottom plate of a main valve body 1, the blind plate 14 stops moving downwards, the driving device 3 drives a frame 11 to continuously vertically move downwards, 8 connecting rod mechanisms 13 arranged on the valve plate assembly 10 push connecting rods 22 to move towards a horizontal position through a right connecting rod base 23, the connecting rods 22 synchronously push the blind plate 14 to translate towards a valve seat 31 through a left connecting rod base 21 until the blind plate is closed to a certain position, the horizontal movement of the blind plate 14 drives a pressing plate 27 fixedly connected with the pressing plate base 20 to synchronously move horizontally, the pressing plate 27 compresses a pressure spring 25, so as to complete the action process from opening to closing. When the valve is opened, the motor of the driving device 3 is started, the driving device 3 drives the transmission shaft 5 and the driving chain wheel 6 of the transmission mechanism component to synchronously rotate in opposite directions, the chain 7 meshed with the driving chain wheel 6 and the driven chain wheel 8 is connected with the chain joint 15 of the valve plate assembly 10 to drive the frame 11 of the valve plate assembly 10 to move vertically upwards, under the self-weight action of the blind plate member 14, the compression springs 25 of the 4 spring mechanisms 12 uniformly distributed on the valve plate assembly 10 release compression potential energy to push the blind plate member 14 to horizontally move to separate from the valve seat, the horizontal distance of the blind plate member 14 separating from the valve seat 31 is determined by the vertical distance V between the limiting block 17 and the limiting rod 18, when the limiting block 17 and the limiting rod 18 are attached and limited in the vertical direction, the blind plate 14 moves horizontally in place, the blind plate 14 synchronously moves vertically upwards along with the frame 11 until the blind plate is opened in place, and the action process of the valve from being closed in place to being opened in place is completed.

The utility model discloses a novel push-pull valve can adopt lead screw drive to replace the chain drive in the drive mechanism subassembly, and the quantity of the spring mechanism 12 that set up on the valve plate subassembly 10 and link mechanism 13 can change along with the difference of valve bore, and the quantity of the leading wheel subassembly 9 that main valve body 1 and auxiliary valve body 2 set up can change along with the difference of valve bore, and the change of above-mentioned project organization is patent protection's scope.

Claims

1. The utility model provides a novel gate valve, includes the main valve body (1), with the vertical vice valve body (2) that is connected of the main valve body (1), the main valve body (1) is located vice valve body (2) under, its characterized in that: a driving device (3) is arranged on one side of the upper end of the outer part of the auxiliary valve body (2), a transmission mechanism assembly connected with the driving device (3) is arranged in the auxiliary valve body (2), and a valve plate assembly (10) connected with the transmission mechanism assembly is arranged in a shell formed by the main valve body (1) and the auxiliary valve body (2); the main valve body (1) and the auxiliary valve body (2) are both of a box type structure, the upper and lower butt joint parts of the auxiliary valve body (2) and the main valve body (1) are provided with openings as passages for the valve plate assembly (10) to run up and down, the front end and the rear end of the main valve body (1) are respectively provided with an end flange (28), the end flanges (28) are respectively connected with a front panel (29) and a rear panel (30) of the main valve body (1) through cylinders, the inner side of the rear panel (30) is provided with a circular valve seat (31) concentric with the end flanges (28), and the sealing surface of the valve seat (31) is parallel to the plane of the valve plate assembly (10) to run;

the frame (11) comprises a left vertical frame, a right vertical frame, an upper transverse frame and a lower transverse frame, diagonal corner section steel is arranged at four corners between the vertical frame and the transverse frames, connecting parts which are in transmission connection with the transmission mechanism assembly are respectively arranged at the left side and the right side of the upper part of the frame (11), and the vertical frames at the left side and the right side of the frame (11) are used as vertical guide rails (16);

the number of the connecting rod mechanisms (13) is 8, two of the connecting rod mechanisms are uniformly arranged between the adjacent spring mechanisms (12) in a group, each connecting rod mechanism (13) comprises a left connecting rod base (21), a connecting rod (22) and a right connecting rod base (23), the left connecting rod base (21) is fixedly connected with the blind plate piece (14), the right connecting rod base (23) is fixedly connected with the frame (11) through a steel plate, the central connecting line of two hinged holes of each connecting rod (22) forms an acute angle with the horizontal plane in the closing and opening states of the valve, the acute angle in the opening state is larger than that in the closing state, and when the vertical downward acting force of the frame (11) on the connecting rods (22) is a certain value in the closing state of the valve, the size of the acute angle is determined by the size of the component force required by the connecting rods (22;

a limiting block (17) is arranged on the frame (11), a limiting rod (18) is arranged on the blind plate piece (14), the arrangement position of the limiting rod (18) corresponds to the limiting block (17), and a top rod (19) is arranged at the lower part of the blind plate piece (14);

2. A novel gate valve as claimed in claim 1, wherein: the transmission mechanism component comprises a bearing seat (4), a transmission shaft (5), a driving chain wheel (6), a chain (7) and a driven chain wheel (8); two ends of a transmission shaft (5) are respectively symmetrically provided with a bearing seat (4) and a driving sprocket (6), the bearing seats (4) are installed on a cross beam arranged in an inner cavity of an auxiliary valve body (2), one end of the transmission shaft (5) is connected with an output end of a driving device (3), two side edges of the lower end part of the inner cavity of the auxiliary valve body (2) are respectively symmetrically provided with a driven sprocket (8), and a chain (7) is assembled on the driving sprocket (6) and the driven sprocket (8);