Gate valve

Abstract

The utility model belongs to the technical field of valves, and discloses a gate valve. The gate valve comprises a valve body and a gate mechanism, the valve body comprises a circulation part and an installation part which are arranged in an intersecting mode, and a gate channel is formed in the installation part and intersects with the circulation channel; the brake mechanism comprises a mounting box body, a rotary driving piece, a torque limiting assembly, a transmission assembly and a brake body, the box body is mounted on the mounting part, the rotary driving piece is mounted on the mounting box body, the torque limiting assembly comprises a connecting piece, two clamping pieces and a pressing piece, and an output shaft of the rotary driving piece is coaxially connected with the connecting piece; the two clamping pieces are arranged on the periphery of the connecting piece in a sleeving mode at intervals, the pressing piece is connected with the end, deviating from the rotary driving piece, of the connecting piece in an axial position adjustable mode, the input end of the transmission assembly is clamped between the two clamping pieces, the output end of the transmission assembly is provided with a stud, and the brake body is in threaded connection with the stud. According to the gate valve, the torque can be limited, and the maximum torque outwards output by the driving piece can be adjusted.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially relates to a gate valve. BACKGROUND

[0002] In the use of the conventional regulating type electric gate valve, there is no effective protection mechanism against misoperation or abnormal conditions, and in the closing or opening process of the gate valve, the internal components of the gate valve can be damaged due to excessive force or abnormal resistance, affecting the service life and safety of the gate valve. For example, when the gate valve encounters abnormal conditions such as jamming, if the electric actuator continues to apply excessive torque, it can cause irreparable damage to the gate plate, valve body or sealing structure of the gate valve. In addition, when the operator makes a mistake, this uncontrolled torque output can also pose a safety hazard. In the prior art, the torque adjusting structure is relatively complex, and the maximum torque value cannot be adjusted.

[0003] Therefore, there is an urgent need to design a gate valve to solve the above problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a gate valve which can limit the torque when the torque of the driving part is too large, prevent the damage of the internal components of the gate valve caused by excessive force or abnormal resistance, and adjust the maximum torque outputted by the driving part.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] The gate valve comprises:

[0007] The valve body comprises a flow-through part and a mounting part arranged in intersection, the flow-through part forms a flow-through channel inside, liquid can flow from one end to the other end of the flow-through channel, and the mounting part forms a gate channel inside, the gate channel is arranged in intersection with the flow-through channel;

[0008] The gate mechanism comprises a mounting box body, a rotary driving part, a torque limiting assembly, a transmission assembly and a gate body, the mounting box body is mounted on the mounting part, the rotary driving part is mounted on the mounting box body, the torque limiting assembly comprises a connecting piece, two clamping pieces and a pressing piece, the output shaft of the rotary driving part is coaxially connected with the connecting piece, two clamping pieces are spaced apart and sleeved on the outer periphery of the connecting piece, and the pressing piece is adjustably connected with the connecting piece in the axial position away from the rotary driving part, the pressing piece is used for applying clamping force to one of the clamping pieces, the input end of the transmission assembly is clamped between the two clamping pieces, the output end of the transmission assembly is configured as a threaded stud, the threaded stud extends into the gate channel, and the gate body is threadedly connected with the threaded stud to reciprocate in the gate channel along with the rotation of the threaded stud to open or cut off the flow-through channel.

[0009] Optionally, the transmission assembly comprises:

[0010] The first transmission member is arranged around the connecting member and clamped between the two clamping members.

[0011] The second transmission member is in the shape of a box, at least part of the torque limiting assembly is located in the second transmission member, the stud is connected to the second transmission member, one of the second transmission member and the first transmission member is provided with a first protrusion, and the other is provided with a first recess, and at least part of the first protrusion is located in the first recess.

[0012] Optionally, the mounting box comprises a first mounting member mounted on the mounting portion, the first mounting member is provided with a first hole and a second hole connected to each other, the first hole is arranged close to the second transmission member and has a diameter larger than that of the second hole, the stud comprises a threaded portion and a limiting portion connected to each other, at least part of the threaded portion is located in the gate channel, the diameter of the position where the threaded portion is connected to the limiting portion is matched with the diameter of the second hole, the diameter of the limiting portion is matched with the diameter of the first hole, the limiting portion can be limited to the bottom of the first hole, and the end of the limiting portion away from the threaded portion is connected to the second transmission member.

[0013] Optionally, the bottom outer wall of the second transmission member is recessed inward to form a slot, the end of the limiting portion away from the threaded portion forms a connecting portion, the cross section of the connecting portion is in the shape of a step, the connecting portion is inserted into the slot, and the shoulder of the connecting portion abuts against the bottom outer wall of the second transmission member and is arranged higher than the first mounting member.

[0014] Optionally, the connecting member is provided with an insertion hole along the axial direction, the output shaft of the rotary drive member is inserted into the insertion hole and forms a plane on the outer periphery, and the connecting member is further provided with a threaded hole arranged at an included angle with the insertion hole, a locking member is threadedly connected with the threaded hole and can abut against the plane.

[0015] Optionally, the connecting member comprises a flange portion and a shaft portion connected to each other, the pressing member is connected to the shaft portion, the threaded hole is arranged in the shaft portion, the two clamping members are respectively a first clamping member and a second clamping member, one side of the first clamping member abuts against the flange portion, and the other side is used for clamping the input end of the transmission assembly, and the pressing member can apply force to the side of the second clamping member away from the first clamping member.

[0016] Optionally, the compression member is a polygon nut, and is threadedly connected with the shaft portion, the torque limiting assembly further comprises a clamping sheet, the clamping sheet is arranged between the compression member and the second clamping member, an outer peripheral edge of the clamping sheet is configured as a plurality of spaced teeth, and an inner ring of the clamping sheet is non-circular, and the plurality of teeth can be bent to be attached to an outer periphery of the compression member.

[0017] Optionally, the torque limiting assembly further comprises an elastic compression ring, the elastic compression ring is located between the clamping sheet and the second clamping member, and an inner ring and an outer ring of the elastic compression ring are different in axial position.

[0018] Optionally, the torque limiting assembly further comprises a uniform force member, the uniform force member is located between the elastic compression ring and the second clamping member, and an axial projection of the second clamping member falls into the uniform force member.

[0019] Optionally, the gate body comprises a first gate member and a second gate member, one of the first gate member and the second gate member is provided with a second protrusion, and the other is provided with a second recess, and the second protrusion and the second recess are inserted and matched.

[0020] The gate valve has the advantages that:

[0021] The utility model provides a kind of gate valve, when the output shaft of rotary drive part rotates, it drives torque limiting assembly to rotate, since two clamping members clamp the input end of transmission assembly, transmission assembly rotates in turn, to drive stud to rotate, so that gate body moves along the extension direction of stud, to realize the reciprocating movement of gate body in gate passage, to realize the opening or cut-off of flow passage, when the torque of output shaft is too large, the clamping force of two clamping members is limited, cannot drive the input end of transmission assembly to follow, that is, output shaft rotates, two clamping members rotate, but the input end of transmission assembly "slips" between two clamping members and does not rotate in turn, to guarantee that the linear motion of gate body in gate passage is limited, and in the torque limiting assembly, the axial position of compression member in connecting piece is adjustable, the change of the clamping force of two clamping members is realized, and the clamping force can be adjusted according to different gate valve to realize the maximum torque of rotary drive part to transmission assembly. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structure diagram of the gate valve provided by the utility model embodiment Figure 1 ;

[0023] Figure 2 It is the structure diagram of the gate valve provided by the utility model embodiment Figure 2 ;

[0024] Figure 3 It is Figure 2a sectional view taken along A-A in FIG.

[0025] Figure 4 is Figure 2 a sectional view taken along A-A in FIG.

[0026] Figure 5 is an exploded view of the first transmission member and the second transmission member according to an embodiment of the present application;

[0027] Figure 6 is a structural schematic view of the rotary driving member and the partial torque limiting assembly according to an embodiment of the present application;

[0028] Figure 7 is an exploded view of the rotary driving member, the transmission assembly and the gate body according to an embodiment of the present application.

[0029] in the drawing:

[0030] 10, valve body; 11, flow-through part; 111, flow-through channel; 12, mounting part; 121, gate channel;

[0031] 20, gate mechanism; 21, mounting box body; 211, first mounting member; 2111, first hole; 2112, second hole; 212, second mounting member; 213, third mounting member; 214, stop member;

[0032] 22, rotary driving member; 221, output shaft; 2211, flat surface;

[0033] 23, torque limiting assembly; 231, connecting member; 2311, insertion hole; 2312, flange part; 2313, shaft part; 23131, threaded hole; 232, first clamping member; 233, pressing member; 234, locking member; 235, hoop piece; 2351, tooth part; 236, elastic compression ring; 237, uniform force member; 238, second clamping member; 239, protection member;

[0034] 24, transmission assembly; 241, stud; 2411, threaded part; 2412, limiting part; 2413, connecting part; 242, first transmission member; 2421, first protrusion; 243, second transmission member; 2431, first recess; 2432, insertion slot; 25, gate body; 251, first gate member; 2511, second protrusion; 252, second gate member; 2521, second recess. DETAILED DESCRIPTION

[0035] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0036] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements internal communication or two element's mutual action relation.For the ordinary skill in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0037] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional feature between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the first feature horizontal height is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the first feature horizontal height is less than the second feature.

[0038] In the description of the embodiment, the terms "on", "under", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0039] The embodiment provides a gate valve, which can limit torque when the torque of a driving member is too large, to prevent damage to internal components of the gate valve caused by excessive force or abnormal resistance. Figures 1-4As shown, the gate valve comprises a valve body 10 and a gate mechanism 20, the valve body 10 comprises a flow-through part 11 and a mounting part 12, the flow-through part 11 is internally formed with a flow-through channel 111, liquid can flow from one end to the other end of the flow-through channel 111, the mounting part 12 is internally formed with a gate channel 121, the gate channel 121 is arranged intersecting the flow-through channel 111; the gate mechanism 20 comprises a mounting box body 21, a rotary drive 22, a torque limiting assembly 23, a transmission assembly 24 and a gate body 25, the mounting box body 21 is mounted on the mounting part 12, the rotary drive 22 is mounted on the mounting box body 21, the torque limiting assembly 23 comprises a connecting piece 231, two clamping pieces (see the first clamping piece 232 and the second clamping piece 238 in the figure) and a pressing piece 233, the output shaft 221 of the rotary drive 22 is coaxially connected with the connecting piece 231, the two clamping pieces are spaced and sleeved on the outer periphery of the connecting piece 231, the pressing piece 233 is adjustably connected with the connecting piece 231 in the axial position away from the rotary drive 22, the pressing piece 233 is used to apply clamping force to one of the clamping pieces, the input end of the transmission assembly 24 is clamped between the two clamping pieces, the output end of the transmission assembly 24 is configured as a threaded stud 241, the threaded stud 241 extends into the gate channel 121, and the gate body 25 is threadedly connected with the threaded stud 241 to reciprocate in the gate channel 121 to open or cut off the flow-through channel 111 along with the rotation of the threaded stud 241.

[0040] When the output shaft 221 of the rotary drive 22 rotates, the torque limiting assembly 23 is driven to rotate, since the input end of the transmission assembly 24 is clamped by the two clamping pieces, the transmission assembly 24 is driven to rotate, and further drives the threaded stud 241 to rotate, so that the gate body 25 moves along the extension direction of the threaded stud 241, and further realizes the reciprocating movement of the gate body 25 in the gate channel 121 to open or cut off the flow-through channel 111. When the torque of the output shaft 221 is too large, the clamping force of the two clamping pieces is limited, and the input end of the transmission assembly 24 cannot be driven to rotate, that is, the output shaft 221 rotates, the two clamping pieces rotate, but the input end of the transmission assembly 24 "slides" between the two clamping pieces and does not rotate, thereby limiting the linear motion of the gate body 25 in the gate channel 121, and in the torque limiting assembly 23, the axial position of the pressing piece 233 on the connecting piece 231 is adjustable, the clamping force of the two clamping pieces can be changed, and the maximum torque of the rotary drive 22 to the transmission assembly 24 can be adjusted according to different gate valve conditions.

[0041] Optionally, the rotary drive 22 is an electric actuator, when the torque of the electric actuator is too large due to failure, the torque limiting assembly 23 can protect the internal structure of the gate valve.

[0042] For convenience of description, one of the clamping pieces close to the pressing piece 233 is defined as the second clamping piece 238, and the other is defined as the first clamping piece 232.

[0043] Optionally, as shown in Figures 3-5 The transmission assembly 24 includes a first transmission member 242 and a second transmission member 243. The first transmission member 242 is arranged around the outer periphery of the connecting member 231 and clamped between the two clamping members. The second transmission member 243 is in the shape of a box, and at least part of the torque limiting assembly 23 is located inside the second transmission member 243. The stud 241 is connected to the second transmission member 243. One of the second transmission member 243 and the first transmission member 242 is provided with a first protrusion 2421, and the other is provided with a first recess 2431. At least part of the first protrusion 2421 is located in the first recess 2431. With the above arrangement, the first transmission member 242 is clamped by the first clamping member 232 and the second clamping member 238, serving as the input end of the transmission assembly 24. When the torque is too large, the first transmission member 242 "slips", and through the limiting cooperation of the first protrusion 2421 and the first recess 2431, the second transmission member 243 is driven to rotate. The internal space of the second transmission member 243 is used to accommodate part of the torque limiting assembly 23.

[0044] Optionally, as shown in Figure 3 and Figure 4 The mounting box 21 includes a first mounting member 211 mounted on the mounting portion 12. The first mounting member 211 is provided with a first hole 2111 and a second hole 2112 connected to each other. The first hole 2111 is arranged close to the second transmission member 243 and has a diameter larger than that of the second hole 2112. The stud 241 includes a threaded portion 2411 and a limiting portion 2412 connected to each other. At least part of the threaded portion 2411 is located in the gate passage 121. The diameter of the position where the threaded portion 2411 is connected to the limiting portion 2412 is adapted to the diameter of the second hole 2112. The diameter of the limiting portion 2412 is adapted to the diameter of the first hole 2111. The limiting portion 2412 can be limited to the bottom of the first hole 2111. The end of the limiting portion 2412 away from the threaded portion 2411 is connected to the second transmission member 243. With the above arrangement, the limiting portion 2412 can support the parts above it, so as to balance the stress of the suspended parts in the entire gate valve.

[0045] Optionally, as shown in Figure 4 The mounting box 21 further includes a stop member 214 mounted on the side of the first mounting member 211 away from the mounting portion 12. The other side of the limiting portion 2412 is limited by the stop member, that is, both sides of the limiting portion 2412 are correspondingly limited, so as to prevent the stud 241 from moving axially.

[0046] Optionally, as shown in Figure 4As shown, the mounting box 21 further comprises a second mounting member and a third mounting member 213, the second mounting member 212 is buckled to the first mounting member 211, and the stopper 214 is located inside the second mounting member 212, the third mounting member 213 is buckled to the second mounting member 212, and the third mounting member 213 is provided with a mounting position for mounting the rotary driving member 22, which can facilitate the quick alignment of the rotary driving member 22 during installation. After the rotary driving member 22 is installed, the output shaft 221 thereof extends into the second mounting member 212, and the torque limiting assembly 23, the first transmission member 242, the second transmission member 243 and part of the stud 241 are located inside the second mounting member 212. That is, for internal parts, the rotary driving member 22 is fixed, and the limiting portion 2412 is limited to achieve force balance of the internal parts of the mounting box 21.

[0047] Optionally, as shown in Figure 4 The bottom outer wall of the second transmission member 243 is recessed inward to form a slot 2432, and the end of the limiting portion 2412 away from the threaded portion 2411 forms a connecting portion 2413. The cross section of the connecting portion 2413 is stepped, the connecting portion 2413 is inserted into the slot 2432, and the shoulder of the connecting portion 2413 abuts against the bottom outer wall of the second transmission member 243 and is higher than the first mounting member 211. Through the above setting, when the transmission assembly 24 is installed, after the stud 241 is installed, the position of the limiting portion 2412 is fixed due to the setting of the limiting portion 2412, and then the second transmission assembly 24 is inserted into the top of the connecting portion 2413. The bottom outer wall of the second transmission member 243 is higher than the first mounting member 211, which ensures the gap setting between the second transmission member 243 and the stopper 214. During rotation, the bottom of the second transmission member 243 will not be worn. Then the rotary driving member 22 is installed on the second mounting member 212, the torque limiting assembly 23 and the first transmission member 242 are assembled, the second mounting member 212 is installed on the first mounting member 211, and the third mounting member 213 is buckled in place to complete the installation.

[0048] Optionally, as shown in Figure 3 And Figure 4 The connecting member 231 is provided with a threaded hole 23131 at an angle with the insertion hole 2311, and the locking member 234 is threadedly connected with the threaded hole 23131 and can abut against the flat surface 2211. Through the above setting, the output shaft 221 is inserted into the insertion hole 2311, the output shaft 221 has a flat surface 2211, and the locking member 234 abuts against the flat surface 2211 to fix the connecting member 231 and the output shaft 221.

[0049] Optionally, the connecting piece 231 comprises a flange part 2312 and a shaft part 2313 connected with each other, the pressing piece 233 is connected with the shaft part 2313, the threaded hole 23131 is arranged on the shaft part 2313, one side of the first clamping piece 232 abuts against the flange part 2312, and the other side is used for clamping the input end of the transmission assembly 24, and the pressing piece 233 can apply force to the side of the second clamping piece 238 away from the first clamping piece 232. The flange part 2312 plays a role of limiting the first clamping piece 232, and the shaft part 2313 is fixed with the output shaft 221 through the locking piece 234.

[0050] Optionally, referring to Figure 3 , Figure 4 and Figure 6 , the pressing piece 233 is a polygon nut (hexagonal nut in this embodiment, and in other embodiments, the shape can be polygonal, as long as it is not circular), and is in threaded connection with the shaft part 2313, and the torque limiting assembly 23 further comprises a hoop piece 235, the hoop piece 235 is arranged between the pressing piece 233 and the second clamping piece 238, the outer peripheral edge of the hoop piece 235 is configured as a plurality of spaced tooth parts 2351, and the inner ring of the hoop piece 235 is non-circular, and the plurality of tooth parts 2351 can be bent to be attached to the outer periphery of the pressing piece 233. Through the above arrangement, after the torque limiting assembly 23 is assembled, the tooth parts 2351 of the hoop piece 235 are bent and attached to the polygon nut, and it can be seen from Figure 4 that the inner ring of the shaft part 2313 and the hoop piece 235 is non-circular, that is, the hoop piece 235 cannot rotate relative to the shaft part 2313, and when the tooth parts 2351 are bent and attached to the outer peripheral surface of the polygon nut, the pressing piece 233 is prevented from rotating relative to the shaft part 2313, thereby avoiding rotation of the pressing piece 233 in the use process, causing insufficient clamping force, and thereby ensuring that the maximum torque output by the rotary driving piece 22 remains stable and unchanged.

[0051] Optionally, as shown in Figure 3 , the torque limiting assembly 23 further comprises an elastic pressing ring 236, the elastic pressing ring 236 is located between the hoop piece 235 and the second clamping piece 238, and the inner ring and the outer ring of the elastic pressing ring 236 are different in axial position. The above arrangement plays a role of buffering during the process in which the pressing piece 233 applies force to the second clamping piece 238 by the elastic pressing ring 236.

[0052] Optionally, as shown in Figure 3 , the torque limiting assembly 23 further comprises a uniform force piece 237, the uniform force piece 237 is located between the elastic pressing ring 236 and the second clamping piece 238, and the projection of the second clamping piece 238 in the axial direction falls within the uniform force piece 237. It can be understood that, if the uniform force piece 237 is not arranged, the elastic pressing ring 236 and the second clamping piece 238 are in line contact, and the uniformity of clamping of the second clamping piece 238 to the first transmission piece 242 is poor, and the above arrangement avoids this.

[0053] Optionally, as shown in Figure 3 The torque limiting assembly 23 further comprises a protection piece 239, which is sleeved outside the shaft portion 2313 and between the first clamping piece 232 and the second clamping piece 238, and the first transmission piece 242 is sleeved outside the protection piece 239. With the above arrangement, the first transmission piece 242 can be prevented from directly contacting the shaft portion 2313, thereby avoiding abrasion of the shaft portion 2313.

[0054] Optionally, as shown in Figure 7 The gate body 25 comprises a first gate piece 251 and a second gate piece 252, one of the first gate piece 251 and the second gate piece 252 is provided with a second protrusion 2511, and the other is provided with a second recess 2521, and the second protrusion 2511 is inserted and matched with the second recess 2521. With the above arrangement, the first gate piece 251 and the second gate piece 252 can be conveniently formed. It can be understood that, if the gate body 25 is integrally provided, the threads and other features inside it cannot meet the mold opening angle, and it is not easy to be injection molded.

[0055] In addition, the gate valve as a whole adopts a rotary driving form to drive the gate body 25 to move up and down, and there is no part moving in the axial direction except the gate body 25, thereby shortening the size of the gate valve in the height direction and being able to adapt to smaller installation space.

[0056] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A gate valve, characterized by The utility model relates to a valve body (10) and a gate mechanism (20), and the valve body (10) comprises a flow passage (111) and a gate passage (121), and the gate mechanism (20) comprises a mounting box body (21), a rotating drive part (22), a torque limiting assembly (23), a transmission assembly (24) and a gate body (25). The utility model relates to a valve body (10) and a gate mechanism (20), and the valve body (10) comprises a flow passage (111) and a gate passage (121), and the gate mechanism (20) comprises a mounting box body (21), a rotating drive part (22), a torque limiting assembly (23), a transmission assembly (24) and a gate body (25). The transmission assembly (24) comprises:

2. The gate valve of claim 1, wherein, A first transmission part (242) is arranged around the outer periphery of the connecting part (231) and clamped between the two clamping parts. A second transmission part (243) is in the shape of a box, at least part of the torque limiting assembly (23) is located in the second transmission part (243), the threaded stud (241) is connected to the second transmission part (243), one of the second transmission part (243) and the first transmission part (242) is provided with a first protrusion (2421), and the other is provided with a first recess (2431), and at least part of the first protrusion (2421) is located in the first recess (2431). ​ 3. The gate valve of claim 2, wherein, The mounting box body (21) comprises a first mounting piece (211) mounted on the mounting portion (12), the first mounting piece (211) is provided with a first hole (2111) and a second hole (2112) connected with each other, the first hole (2111) is arranged close to the second transmission piece (243), and a diameter of the first hole (2111) is greater than that of the second hole (2112); the stud (241) comprises a threaded portion (2411) and a limiting portion (2412) connected with each other, at least part of the threaded portion (2411) is located in the gate channel (121), a diameter of a position where the threaded portion (2411) is connected with the limiting portion (2412) is matched with the diameter of the second hole (2112), a diameter of the limiting portion (2412) is matched with the diameter of the first hole (2111), the limiting portion (2412) can be limited on a hole bottom of the first hole (2111), and one end of the limiting portion (2412) away from the threaded portion (2411) is connected with the second transmission piece (243).

4. The gate valve of claim 3, wherein, A bottom outer wall of the second transmission piece (243) is inwardly recessed to form a slot (2432), the one end of the limiting portion (2412) away from the threaded portion (2411) forms a connecting portion (2413), a cross section of the connecting portion (2413) is in a stepped shape, the connecting portion (2413) is inserted into the slot (2432), and a shoulder of the connecting portion (2413) abuts against the bottom outer wall of the second transmission piece (243) and is arranged higher than the first mounting piece (211).

5. The gate valve according to any one of claims 1 to 4, characterized in that The connecting piece (231) is provided with an insertion hole (2311) along an axial direction thereof, the output shaft (221) of the rotary driving piece (22) is inserted into the insertion hole (2311) and forms a flat surface (2211) on an outer periphery, and the connecting piece (231) is further provided with a threaded hole (23131) arranged at an angle with the insertion hole (2311), a locking piece (234) is threadedly connected with the threaded hole (23131) and can abut against the flat surface (2211).

6. The gate valve of claim 5, wherein, The connecting piece (231) comprises a flange portion (2312) and a shaft portion (2313) connected with each other, the pressing piece (233) is connected with the shaft portion (2313), the threaded hole (23131) is arranged on the shaft portion (2313), the two clamping pieces are respectively a first clamping piece (232) and a second clamping piece (238), one side of the first clamping piece (232) abuts against the flange portion (2312), and the other side is used for clamping an input end of the transmission assembly (24), and the pressing piece (233) can apply force to one side of the second clamping piece (238) away from the first clamping piece (232).

7. The gate valve of claim 6, wherein, The pressing member (233) is a polygon nut and is threadedly connected with the shaft portion (2313), the torque limiting assembly (23) further comprises a hoop piece (235) arranged between the pressing member (233) and the second clamping member (238), an outer peripheral edge of the hoop piece (235) is configured as a plurality of spaced teeth (2351), and an inner ring of the hoop piece (235) is non-circular, and the plurality of teeth (2351) can be bent to be attached to an outer periphery of the pressing member (233).

8. The gate valve of claim 7, wherein, The torque limiting assembly (23) further comprises an elastic pressing ring (236) located between the hoop piece (235) and the second clamping member (238), and an inner ring and an outer ring of the elastic pressing ring (236) are different in axial position.

9. The gate valve of claim 8, wherein, The torque limiting assembly (23) further comprises a uniform force member (237) located between the elastic pressing ring (236) and the second clamping member (238), and an axial projection of the second clamping member (238) falls into the uniform force member (237).

10. The gate valve according to any one of claims 1-4, characterized in that The gate body (25) comprises a first gate member (251) and a second gate member (252), one of the first gate member (251) and the second gate member (252) is provided with a second protrusion (2511), and the other is provided with a second recess (2521), the second protrusion (2511) and the second recess (2521) are inserted and matched.

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