阅读说明：本技术 一种凸轮式快速安全阀 (Cam type quick safety valve ) 是由 张治国 嵇南洋 于 2019-10-31 设计创作，主要内容包括：本发明公开一种凸轮式快速安全阀,安全阀包括上阀体和下阀体,上阀体和下阀体之间移动设有盲板,所述上阀体和下阀体之间、盲板的一侧设有控制装置,控制装置包括对称分布的第一固定轴,第一固定轴的两端均设有偏心轴,偏心轴的一端与第一固定轴紧固连接,另一端设有转动轴。本发明安全阀通过控制装置控制上方阀体之间的间隙,使得盲板产生移动,缩短了盲封的时间,无需吊装设备进行吊装,降低了操作难度,降低了工作人员的劳动强度,提高的效率；采用盲板进行分割,有效的隔绝管道的上游和下游,没有泄露的风险,为安全生产提供保障；通过弹性连接件对扣动件进行挤压,实现自锁,确保安全。(The invention discloses a cam type rapid safety valve which comprises an upper valve body and a lower valve body, wherein a blind plate is movably arranged between the upper valve body and the lower valve body, a control device is arranged between the upper valve body and the lower valve body and on one side of the blind plate, the control device comprises first fixed shafts which are symmetrically distributed, eccentric shafts are arranged at two ends of each first fixed shaft, one end of each eccentric shaft is fixedly connected with the corresponding first fixed shaft, and a rotating shaft is arranged at the other end of each eccentric shaft. According to the safety valve, the gap between the upper valve bodies is controlled through the control device, so that the blind plate moves, the blind sealing time is shortened, hoisting equipment is not needed for hoisting, the operation difficulty is reduced, the labor intensity of workers is reduced, and the efficiency is improved; the blind plate is adopted for segmentation, so that the upstream and the downstream of the pipeline are effectively isolated, the risk of leakage is avoided, and the safety production is guaranteed; the buckling piece is extruded through the elastic connecting piece, self-locking is achieved, and safety is guaranteed.)

1. A cam type rapid safety valve comprises an upper valve body (1) and a lower valve body (2), wherein a blind plate (3) is movably arranged between the upper valve body (1) and the lower valve body (2), and is characterized in that a control device (5) is arranged between the upper valve body (1) and the lower valve body (2) and on one side of the blind plate (3);

the control device (5) comprises first fixed shafts (51) which are symmetrically distributed, two ends of each first fixed shaft (51) are respectively provided with an eccentric shaft (512), one end of each eccentric shaft (512) is fixedly connected with the corresponding first fixed shaft (51), and the other end of each eccentric shaft (512) is provided with a rotating shaft (513);

one end of any one of the rotating shafts (513) is fixedly connected with the eccentric shaft (512), the other end of the rotating shaft is provided with a first connecting plate (514), and the first connecting plate (514) is provided with a clamping shaft (515) and a second fixed shaft (516);

the control device (5) comprises a connecting piece (52), the connecting piece (52) comprises a connecting piece main body (521), third through holes (522) which are symmetrically distributed are formed in the connecting piece main body (521), a third fixing shaft (523) is arranged on the connecting piece main body (521), one end of the third fixing shaft (523) is fixedly connected with the connecting piece main body (521), a first limiting block (524) is arranged at the other end of the third fixing shaft, a fourth fixing shaft (525) is arranged on the connecting piece main body (521), one end of the fourth fixing shaft (525) is fixedly connected with the connecting piece main body (521), and a second limiting block (526) is arranged at the other;

the connecting piece (52) is rotatably provided with a buckling piece (54), the buckling piece (54) comprises a buckling piece main body (541), a fourth through hole (542) is formed in the buckling piece main body (541), the buckling piece (54) is rotatably connected with a fourth fixed shaft (525) through the fourth through hole (542), a clamping groove (543) is formed in the buckling piece main body (541), and the clamping groove (543) is matched with the clamping shaft (515) on one side;

the buckling piece main body (541) is provided with a second connecting block (544), and the second connecting block (544) is provided with a fifth through hole (545).

2. The cam type quick safety valve according to claim 1, wherein the upper valve body (1) comprises a first pipe body (11), one end of the first pipe body (11) is provided with a first flange (12) connected with an external pipeline, the other end of the first pipe body is provided with a first supporting plate (13), the first supporting plate (13) is fixed on the outer wall of the first pipe body (11), a first sealing ring (14) is arranged below the first supporting plate (13), first supporting rods (15) are symmetrically distributed above the first supporting plate (13) and on two sides of the first pipe body (11), symmetrical supporting rods (16) are arranged between the first supporting rods (15), and the supporting rods (16) are positioned on two sides of the first pipe body (11);

be equipped with second bracing piece (17) of symmetric distribution on first bracing piece (15), the one end and first bracing piece (15) fastening connection of second bracing piece (17), the other end is equipped with first perforation hole (18), the below of first bracing piece (13), the both sides of first body (11) all are equipped with first gag lever post (19) of symmetric distribution, the one end and first bracing piece (13) fastening connection of first gag lever post (19), the other end is equipped with first contact piece (191).

3. The cam type rapid safety valve according to claim 1, wherein the lower valve body (2) comprises a second pipe body (21), one end of the second pipe body (21) is provided with a second flange (22) connected with an external pipeline, the other end of the second pipe body is provided with a second support plate (23), the second support plate (23) is provided with a second sealing ring (24), the second support plate (23) is fixed on the outer wall of the second pipe body (21), third support rods (25) are symmetrically distributed below the second support plate (23), and second through holes (26) are symmetrically distributed on the third support rods (25);

second limiting rods (27) are symmetrically distributed above the second supporting plate (23) and on two sides of the second pipe body (21), one end of each second limiting rod (27) is fixedly connected with the second supporting plate (23), and the other end of each second limiting rod is provided with a second contact block;

an extrusion sleeve (28) is arranged above the second supporting plate (23) and between the second limiting rods (27), a first buffer hole (281) is formed in the extrusion sleeve (28), a first sliding hole (282) is formed in the extrusion sleeve (28), and the first sliding hole (282) is communicated with the first buffer hole (281);

a contact rod (29) is arranged in the extrusion sleeve (28), the contact rod (29) comprises a first sliding rod (291) which is positioned in a first sliding hole (282) and slides, one end of the first sliding rod (291) is provided with a first buffering contact block (293) which is positioned in a first buffering hole (281) and slides, the other end of the first sliding rod is provided with a third contact block (292), and the contact rod (29) is in contact with the first supporting plate (13) through the third contact block (292);

a first elastic piece (20) is arranged in the first buffer hole (281), one end of the first elastic piece (20) is fixedly connected with the inner wall of the first buffer hole (281), and the other end of the first elastic piece is fixedly connected with the first buffer contact block (293).

4. The cam type rapid safety valve according to claim 1, wherein the blind plate (3) comprises a square plate main body (31), a first sealing groove (34) and a second sealing groove (35) are respectively arranged on two sides of the square plate main body (31), a circulation hole (36) is arranged in the second sealing groove (35), first connecting blocks (32) are respectively arranged on two ends of the square plate main body (31), a handle (33) is arranged on each first connecting block (32), and the first sealing groove (34) and the second sealing groove (35) are matched with the first sealing ring (14) and the second sealing ring (24) for use.

5. The cam type rapid safety valve according to claim 1, wherein a dust cover (4) is arranged on the blind plate (3), the dust cover (4) comprises a square frame body (41), a threaded hole (42) is formed in one side of the square frame body (41), an extrusion part (43) is rotatably arranged in the threaded hole (42), the dust cover (4) is sleeved on the square plate main body (31) through the square frame body (41), the first sealing groove (34) and the second sealing groove (35) are prevented from dust, and the extrusion part (43) is screwed to fix the dust cover (4) on the blind plate (3).

6. The cam type rapid relief valve according to claim 1, wherein the rotation shaft (513) is coaxial with the first fixed shaft (51), and the eccentric shaft (512) is located on a different straight line from the first fixed shaft (51);

the first fixed shaft (51) is positioned in the first through hole (18) through a rotating shaft (513) to rotate, and the eccentric shaft (512) is positioned in the second through hole (26).

7. The cam type quick safety valve according to claim 1, wherein the connecting member (52) is rotatably connected with the two second fixing shafts (516) through two third through holes (522), and the handle (53) is fixedly connected to the first connecting plate (514) of any one of the first fixing shafts (51).

8. The cam type rapid safety valve according to claim 1, wherein the control device (5) is provided with an elastic connecting piece (6), the elastic connecting piece (6) comprises an elastic fixed connecting piece (61), an elastic movable connecting piece (62) and a second elastic piece (63), one end of the elastic fixed connecting piece (61) is provided with a sixth through hole (611), the other end of the elastic fixed connecting piece is provided with a second sliding hole (613), and a second buffer hole (612) is arranged in the second sliding hole (613).

9. The cam type rapid safety valve according to claim 8, wherein the elastic moving connecting member (62) comprises a second slide rod (621) sliding in the second slide hole (613), one end of the second slide rod (621) is provided with a second buffer contact block (622) sliding in the second buffer hole (612), the other end is provided with a fifth fixed shaft (623), and the elastic moving connecting member (62) is rotatably connected with the fifth through hole (545) through the fifth fixed shaft (623).

10. The cam type rapid safety valve according to claim 8, wherein the elastic connecting member (6) is rotatably connected with the third fixed shaft (523) through a sixth through hole (611), one end of the second elastic member (63) is tightly connected with the inner wall of the second buffer hole (612), and the other end is tightly connected with the second buffer contact block (622).

Technical Field

The invention relates to a safety valve, in particular to a cam type quick safety valve.

Background

Important production pipe fitting during the valve, adopt different valves to use on the body very according to the needs of production, blind among the prior art seals and needs to adopt lifting device to hoist, many people install the operation, it is consuming time hard, and is slow in speed, and is inefficient, adopts other valves to replace mostly, and valve among the prior art lacks self-lock device, in liquid impact and vibrations in-process, very easily leads to sealed not tight, exists and reveals the risk, and the reliability is low, is unfavorable for going on in order of safety in production.

Disclosure of Invention

The invention aims to provide a cam type rapid safety valve, wherein an extrusion piece is twisted, a dust cover is taken down from a blind plate, a buckling piece is rotated to separate a clamping groove from a clamping shaft, an eccentric shaft is positioned in a second through hole to rotate through a rotating handle, a lower valve body is extruded by a contact rod to generate a gap between an upper valve body and the lower valve body, the blind plate is pushed/pulled to enable a circulation hole to be communicated with a first pipe body and a second pipe body, a second sealing groove is matched with a first sealing ring and a second sealing ring, or the first pipe body and the second pipe body are intercepted through a square plate main body, the first sealing groove is matched with the first sealing ring and the second sealing ring, after the operation is finished, the eccentric shaft is positioned in the second through hole to rotate through the rotating handle, the upper valve body and the lower valve body fixedly extrude the blind plate, the clamping groove of the piece is clamped in the clamping shaft, the dust cover is sleeved on the extended blind plate of, the blind sealing time is shortened, hoisting equipment is not needed for hoisting, the operation difficulty is reduced, the labor intensity of workers is reduced, and the efficiency is improved; the blind plate is adopted for segmentation, so that the upstream and the downstream of the pipeline are effectively isolated, the risk of leakage is avoided, and the safety production is guaranteed; the buckling piece is extruded through the elastic connecting piece, self-locking is achieved, and safety is guaranteed.

The purpose of the invention can be realized by the following technical scheme:

a cam type rapid safety valve comprises an upper valve body and a lower valve body, a blind plate is movably arranged between the upper valve body and the lower valve body, and a control device is arranged between the upper valve body and the lower valve body and on one side of the blind plate.

The control device comprises first fixing shafts which are symmetrically distributed, eccentric shafts are arranged at two ends of each first fixing shaft, one ends of the eccentric shafts are fixedly connected with the first fixing shafts, and rotating shafts are arranged at the other ends of the eccentric shafts.

One end of any one of the rotating shafts is fixedly connected with the eccentric shaft, the other end of the rotating shaft is provided with a first connecting plate, and the first connecting plate is provided with a clamping shaft and a second fixing shaft.

The control device comprises a connecting piece, the connecting piece comprises a connecting piece main body, third through holes which are symmetrically distributed are formed in the connecting piece main body, a third fixed shaft is arranged on the connecting piece main body, one end of the third fixed shaft is in fastening connection with the connecting piece main body, a first limiting block is arranged at the other end of the third fixed shaft, a fourth fixed shaft is arranged on the connecting piece main body, one end of the fourth fixed shaft is in fastening connection with the connecting piece main body, and a second limiting block is arranged at.

The connecting piece is rotatably provided with a buckling piece, the buckling piece comprises a buckling piece main body, a fourth through hole is formed in the buckling piece main body, the buckling piece is rotatably connected with a fourth fixed shaft through the fourth through hole, a clamping groove is formed in the buckling piece main body, and the clamping groove is matched with the clamping shaft on one side.

And a second connecting block is arranged on the buckling piece main body, and a fifth through hole is formed in the second connecting block.

Further, go up the valve body and include first body, the one end of first body is equipped with the first flange of being connected with external pipeline, and the other end is equipped with first backup pad, and the outer wall at first body is fixed to first backup pad, and the below of first backup pad is equipped with first sealing ring, and the top of first backup pad, the both sides of first body are equipped with the first bracing piece of symmetric distribution, are equipped with the support column of symmetry between the first bracing piece of symmetric distribution, and the support column is located the both sides of first body.

The first support rod is provided with second support rods which are symmetrically distributed, one end of each second support rod is fixedly connected with the corresponding first support rod, the other end of each second support rod is provided with a first through hole, first limiting rods which are symmetrically distributed are arranged below the first support plate and on two sides of the first pipe body, one end of each first limiting rod is fixedly connected with the corresponding first support plate, and the other end of each first limiting rod is provided with a first contact block.

Further, the lower valve body comprises a second pipe body, a second flange connected with an external pipeline is arranged at one end of the second pipe body, a second supporting plate is arranged at the other end of the second pipe body, a second sealing ring is arranged on the second supporting plate, the second supporting plate is fixed on the outer wall of the second pipe body, third supporting rods which are symmetrically distributed are arranged below the second supporting plate, and second through holes which are symmetrically distributed are formed in the third supporting rods.

The top of second backup pad, the both sides of second body all are equipped with the second gag lever post of symmetric distribution, and the one end and the second backup pad fastening of second gag lever post are connected, and the other end is equipped with the second and contacts the piece.

An extrusion sleeve is arranged between the upper portion of the second supporting plate and the second limiting rod, a first buffer hole is formed in the extrusion sleeve, a first sliding hole is formed in the extrusion sleeve, and the first sliding hole is communicated with the first buffer hole.

The extrusion sleeve is internally provided with a contact rod, the contact rod comprises a first sliding rod which is positioned in a first sliding hole and slides, one end of the first sliding rod is provided with a first buffering contact block which is positioned in the first buffering hole and slides, the other end of the first sliding rod is provided with a third contact block, and the contact rod is contacted with a first supporting plate through the third contact block.

And a first elastic piece is arranged in the first buffer hole, one end of the first elastic piece is fixedly connected with the inner wall of the first buffer hole, and the other end of the first elastic piece is fixedly connected with the first buffer contact block.

Further, the blind plate comprises a square plate main body, a first sealing groove and a second sealing groove are formed in the two sides of the square plate main body, a circulation hole is formed in the second sealing groove, first connecting blocks are arranged at the two ends of the square plate main body, handles are arranged on the first connecting blocks, and the first sealing groove and the second sealing groove are matched with the first sealing ring and the second sealing ring.

Further, be equipped with the dust cover on the blind plate, the dust cover includes square frame, and one side of square frame is equipped with the screw hole, and threaded hole internal rotation is equipped with the extruded article, and the dust cover passes through square frame suit in square board main part, prevents dust first seal groove and second seal groove, twists and moves the extruded article, fixes the dust cover on the blind plate.

Furthermore, the rotating shaft and the first fixed shaft are coaxial, and the eccentric shaft and the first fixed shaft are located on different straight lines.

The first fixing shaft is positioned in the first through hole through the rotating shaft to rotate, and the eccentric shaft is positioned in the second through hole.

Furthermore, the connecting piece is respectively connected with the two second fixing shafts in a rotating mode through the two third through holes, and the handle is fixedly connected to the first connecting plate of any one first fixing shaft.

Furthermore, the control device is provided with an elastic connecting piece, the elastic connecting piece comprises an elastic fixed connecting piece, an elastic movable connecting piece and a second elastic piece, one end of the elastic fixed connecting piece is provided with a sixth through hole, the other end of the elastic fixed connecting piece is provided with a second sliding hole, and a second buffer hole is formed in the second sliding hole.

Furthermore, the elastic movable connecting piece comprises a second sliding rod which is positioned in the second sliding hole and slides, one end of the second sliding rod is provided with a second buffering contact block which is positioned in the second buffering hole and slides, the other end of the second sliding rod is provided with a fifth fixing shaft, and the elastic movable connecting piece is rotatably connected with the fifth through hole through the fifth fixing shaft.

Furthermore, the elastic connecting piece is rotatably connected with the third fixed shaft through the sixth through hole, one end of the second elastic piece is fixedly connected with the inner wall of the second buffer hole, and the other end of the second elastic piece is fixedly connected with the second buffer contact block.

The invention has the beneficial effects that:

1. according to the safety valve, the gap between the upper valve bodies is controlled through the control device, so that the blind plate moves, the blind sealing time is shortened, hoisting equipment is not needed for hoisting, the operation difficulty is reduced, the labor intensity of workers is reduced, and the efficiency is improved;

2. the safety valve is divided by the blind plate, so that the upstream and the downstream of the pipeline are effectively isolated, the risk of leakage is avoided, and the safety production is guaranteed;

3. the safety valve provided by the invention can extrude the buckling piece through the elastic connecting piece, realizes self-locking and ensures safety.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of the safety valve of the present invention;

FIG. 2 is a schematic view of the safety valve of the present invention;

FIG. 3 is a schematic view of the upper valve body structure of the present invention;

FIG. 4 is a schematic view of the lower valve body of the present invention;

FIG. 5 is a sectional view showing a partial structure of the safety valve of the present invention;

FIG. 6 is a schematic view of the blind structure of the present invention;

FIG. 7 is a schematic view of a dust boot construction of the present invention;

FIG. 8 is a schematic view of a first stationary shaft construction of the present invention;

FIG. 9 is a schematic view of a connector configuration of the present invention;

FIG. 10 is a schematic view of a fastener of the present invention;

FIG. 11 is a schematic view of a partial structure of the safety valve of the present invention;

FIG. 12 is a schematic view of a partial structure of the safety valve of the present invention;

fig. 13 is a partial structural sectional view of the safety valve of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A cam type rapid safety valve comprises an upper valve body 1 and a lower valve body 2, as shown in figures 1 and 2, a blind plate 3 is movably arranged between the upper valve body 1 and the lower valve body 2, and a control device 5 is arranged between the upper valve body 1 and the lower valve body 2 and on one side of the blind plate 3.

Go up valve body 1 and include first body 11, the one end of first body 11 is equipped with the first flange 12 of being connected with external pipeline, the other end is equipped with first backup pad 13, first backup pad 13 is fixed at the outer wall of first body 11, the below of first backup pad 13 is equipped with first sealing ring 14, the top of first backup pad 13, the both sides of first body 11 are equipped with the first bracing piece 15 of symmetric distribution, be equipped with the support column 16 of symmetry between the first bracing piece 15 of symmetric distribution, support column 16 is located the both sides of first body 11.

The first support rod 15 is provided with a second support rod 17 which is symmetrically distributed, one end of the second support rod 17 is fastened with the first support rod 15, the other end of the second support rod 17 is provided with a first through hole 18, the lower part of the first support plate 13 and the two sides of the first pipe body 11 are both provided with a first limiting rod 19 which is symmetrically distributed, one end of the first limiting rod 19 is fastened with the first support plate 13, and the other end of the first limiting rod is provided with a first contact block 191.

The lower valve body 2 comprises a second pipe body 21, one end of the second pipe body 21 is provided with a second flange 22 connected with an external pipeline, the other end of the second pipe body is provided with a second supporting plate 23, a second sealing ring 24 is arranged on the second supporting plate 23, the second supporting plate 23 is fixed on the outer wall of the second pipe body 21, a third supporting rod 25 which is symmetrically distributed is arranged below the second supporting plate 23, and a second through hole 26 which is symmetrically distributed is formed in the third supporting rod 25.

The second limiting rods 27 which are symmetrically distributed are arranged above the second supporting plate 23 and on two sides of the second pipe body 21, one end of each second limiting rod 27 is fixedly connected with the second supporting plate 23, and the other end of each second limiting rod 27 is provided with a second contact block.

An extrusion sleeve 28 is arranged between the second limiting rod 27 and the upper portion of the second support plate 23, a first buffer hole 281 is arranged in the extrusion sleeve 28, a first sliding hole 282 is arranged on the extrusion sleeve 28, and the first sliding hole 282 is communicated with the first buffer hole 281.

The contact rod 29 is disposed in the pressing sleeve 28, the contact rod 29 includes a first sliding rod 291 sliding in the first sliding hole 282, one end of the first sliding rod 291 is disposed with a first buffer contact block 293 sliding in the first buffer hole 281, the other end is disposed with a third contact block 292, and the contact rod 29 contacts the first support plate 13 through the third contact block 292.

The first buffer hole 281 is provided therein with a first elastic member 20, one end of the first elastic member 20 is fastened to the inner wall of the first buffer hole 281, and the other end is fastened to the first buffer contact block 293.

The blind plate 3 includes a square plate main body 31, as shown in fig. 6, the two sides of the square plate main body 31 are both provided with a first sealing groove 34 and a second sealing groove 35, a flow hole 36 is provided in the second sealing groove 35, the two ends of the square plate main body 31 are both provided with a first connecting block 32, the first connecting block 32 is provided with a handle 33, and the first sealing groove 34 and the second sealing groove 35 are used in cooperation with the first sealing ring 14 and the second sealing ring 24.

The dust cover 4 is arranged on the blind plate 3, as shown in fig. 7, the dust cover 4 comprises a square frame body 41, a threaded hole 42 is formed in one side of the square frame body 41, an extrusion piece 43 is arranged in the threaded hole 42 in a rotating mode, the dust cover 4 is sleeved on the square plate main body 31 through the square frame body 41, the first sealing groove 34 and the second sealing groove 35 are prevented from dust, the extrusion piece 43 is screwed, and the dust cover 4 is fixed on the blind plate 3.

The control device 5 includes first fixed shafts 51 symmetrically distributed, as shown in fig. 8, two ends of each first fixed shaft 51 are provided with eccentric shafts 512, one end of each eccentric shaft 512 is fixedly connected with the first fixed shaft 51, the other end of each eccentric shaft 512 is provided with a rotating shaft 513, the rotating shafts 513 are coaxial with the first fixed shafts 51, and the axes of the eccentric shafts 512 and the first fixed shafts 51 are located on different straight lines.

One end of any rotating shaft 513 is fixedly connected with the eccentric shaft 512, the other end is provided with a first connecting plate 514, and the first connecting plate 514 is provided with a clamping shaft 515 and a second fixed shaft 516.

The first fixed shaft 51 rotates in the first through hole 18 through the rotation shaft 513, and the eccentric shaft 512 is located in the second through hole 26.

The control device 5 includes a connecting member 52, as shown in fig. 9, the connecting member 52 includes a connecting member main body 521, third through holes 522 symmetrically distributed are disposed on the connecting member main body 521, a third fixing shaft 523 is disposed on the connecting member main body 521, one end of the third fixing shaft 523 is fastened to the connecting member main body 521, a first limiting block 524 is disposed at the other end of the third fixing shaft, a fourth fixing shaft 525 is disposed on the connecting member main body 521, one end of the fourth fixing shaft 525 is fastened to the connecting member main body 521, and a second limiting block 526 is disposed at the other end.

The connecting member 52 is rotatably connected to the two second fixing shafts 516 through the two third through holes 522, and the handle 53 is fixedly connected to the first connecting plate 514 of any one of the first fixing shafts 51.

As shown in fig. 10, the fastening member 54 includes a fastening member body 541, the fastening member body 541 is provided with a fourth through hole 542, the fastening member 54 is rotatably connected to the fourth fixed shaft 525 through the fourth through hole 542, the fastening member body 541 is provided with a locking groove 543, and the locking groove 543 is engaged with the locking shaft 515 on one side.

The latching body 541 has a second connection block 544, and the second connection block 544 has a fifth through hole 545.

The control device 5 is provided with an elastic connecting member 6, as shown in fig. 13, the elastic connecting member 6 includes an elastic fixing connecting member 61, an elastic moving connecting member 62 and a second elastic member 63, one end of the elastic fixing connecting member 61 is provided with a sixth through hole 611, the other end is provided with a second sliding hole 613, and a second buffering hole 612 is provided in the second sliding hole 613.

The elastic moving connecting member 62 includes a second sliding rod 621 sliding in the second sliding hole 613, one end of the second sliding rod 621 is provided with a second buffer contact block 622 sliding in the second buffer hole 612, the other end is provided with a fifth fixing shaft 623, and the elastic moving connecting member 62 is rotatably connected to the fifth through hole 545 through the fifth fixing shaft 623.

The elastic connecting member 6 is rotatably connected to the third fixing shaft 523 through the sixth through hole 611, one end of the second elastic member 63 is fixedly connected to the inner wall of the second buffer hole 612, and the other end is fixedly connected to the second buffer contact block 622.

When the dustproof cover is used, the extrusion piece 43 is screwed, the dustproof cover 4 is taken down from the blind plate 3, the buckling piece 54 is rotated, the clamping groove 543 is separated from the clamping shaft 515, the eccentric shaft 512 is positioned in the second through hole 26 to rotate through the rotation handle 53, as shown in fig. 11 and 12, the lower valve body 2 is extruded by the contact rod 29, a gap is generated between the upper valve body 1 and the lower valve body 2, the blind plate 3 is pushed/pulled, the circulation hole 36 is communicated with the first pipe body 11 and the second pipe body 21, the second sealing groove 35 is matched with the first sealing ring 14 and the second sealing ring 24, or the first pipe body 11 and the second pipe body 21 are cut off through the square plate main body 31, the first sealing groove 34 is matched with the first sealing ring 14 and the second sealing ring 24, after the operation is finished, the eccentric shaft 512 is positioned in the second through hole 26 to rotate through the rotation handle 53, so that the upper valve body 1 and the lower valve body 2 fixedly extrude the blind plate 3, the fitting engaging groove 543 is engaged with the engaging shaft 515, and the dust cover 4 is fitted around the blind plate 3 extending out of the valve body.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.