Four-eccentric blind plate quick switching device

Abstract

The invention discloses a four-eccentric type blind plate rapid switching device which comprises a lower valve body assembly, an upper valve body assembly, a sliding plate assembly, a four-eccentric synchronous clamping mechanism, a center positioning sliding guide mechanism, a driving mechanism and a safety lock mechanism. The lower valve body assembly and the upper valve body assembly are basically the same in structure, a flange is arranged on one side and is in butt joint with an installed pipeline flange, the other side is a sealing face, and the face, with the sealing face, of the lower valve body assembly and the face, with the sealing face, of the upper valve body assembly are oppositely installed. The sliding plate assembly is located between the lower valve body assembly and the upper valve body assembly, a through hole is formed in the center of one section, and the other section is used for cutting off media. The four-eccentric synchronous clamping mechanism is used for clamping the lower valve body assembly and the upper valve body assembly; the center positioning sliding guide mechanism is located on the periphery of the sliding plate assembly and can guarantee that the working position of the sliding plate assembly is coaxially centered and limited. And the safety lock mechanism prevents misoperation. The invention has the advantages of simple operation, good sealing performance, rapid switching, small size and light weight.

Description

Technical Field

[0001] This patent relates to a four-eccentric blind plate quick switching device, and in particular to a blind plate device with strict control over installation dimensions and weight, belonging to the technical field of pipeline connection and disconnection. Background Art

[0002] The blind plate device is a pipeline cutting device used to completely isolate the production medium to prevent the production from being affected or even causing an accident due to the loose closure of the cut-off valve. A blind plate device is mentioned in CN 114110191 A, which includes a left valve body, a right valve body, a slide plate with a sealing structure, an eccentric connecting rod actuator and a driving mechanism, wherein the slide plate device is half open and half is a solid plate, and the slide plate can be loosened and clamped by the eccentric connecting rod mechanism and the driving mechanism, and the open and blind working positions of the slide plate can be switched without removing the pipeline docking bolts. However, the shortcomings of this invention are: the pipeline flange and the flange with a sealing surface are connected by a section of pipeline, without integrated processing, and a pressure block and a shaft are set in the middle area, resulting in a large overall size and weight, and the blind plate can only play the role of isolating and conducting the medium at present, and the function is relatively limited.

[0003] At present, low-pressure working conditions such as oil and gas valve devices, acetaldehyde recovery devices, atmospheric pressure storage tank devices, maleic anhydride heat exchanger devices, etc. have strict control over the weight of blind plates. If the blind plate is too heavy, it may cause a heavy burden on the supporting pipelines of the low-pressure working conditions, making it impossible to put it into safe use. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and provide a four-eccentric blind plate quick switching device, which drives the clamping mechanism through a driving mechanism to clamp or loosen the slide plate assembly so that it can quickly switch between the through end and the blind end, thereby realizing the rapid isolation and connection of the low-pressure working medium.

[0005] The technical solution of the present invention is: a four-eccentric blind plate quick switching device, comprising: a lower valve body assembly, an upper valve body assembly, a slide plate assembly, a four-eccentric synchronous clamping mechanism, a center positioning sliding guide mechanism, a driving mechanism and a safety lock mechanism; wherein:

[0006] The lower valve body assembly and the upper valve body assembly have the same shape and structure, and the main body is a rectangular plate structure with a through hole in the middle. A flange is provided on one side of the through hole to butt with the flange of the installed pipeline, and the other side is a sealing surface. The lower valve body assembly and the upper valve body assembly are installed opposite to each other with the sealing surface.

[0007] The slide plate assembly is located between the sealing surfaces of the lower valve body assembly and the upper valve body assembly and is capable of sliding. It is divided into two sections: a through hole is set at the center of one section, and the center of the other section is not hollowed out to cut off the medium;

[0008] The four-eccentric synchronous clamping mechanism is located on both sides of the lower valve body assembly and the upper valve body assembly, and is used to clamp the lower valve body assembly and the upper valve body assembly;

[0009] The center positioning sliding guide mechanism is located around the slide assembly, and is used to align the working positions of the lower valve body assembly, the upper valve body assembly and the middle slide assembly coaxially, and at the same time enable the slide assembly to slide and position quickly along the predetermined track;

[0010] The driving mechanism is located on the four-eccentric synchronous clamping mechanism, and drives the four-eccentric synchronous clamping mechanism to clamp the lower valve body assembly and the upper valve body assembly;

[0011] The safety lock mechanism is fixed to one side of the four-eccentric synchronous clamping mechanism. When the lower valve body assembly and the upper valve body assembly are clamped, the safety lock mechanism can make the drive mechanism unable to operate, thereby preventing the occurrence of misoperation.

[0012] Preferably, the lower valve body assembly includes a lower valve body and a lower pressing block, and the upper valve body assembly includes an upper valve body and an upper pressing block;

[0013] The through hole of the lower valve body assembly is equal in diameter to the diameter of the tubular structure;

[0014] Four lower pressing blocks with through holes are arranged at the four corners of the rectangular plate structure of the lower valve body, and four upper pressing blocks with through holes are arranged at the four corners of the rectangular plate structure in the middle of the upper valve body, and the axial directions of the through holes are perpendicular to the sliding direction of the slide assembly.

[0015] Preferably, the slide plate assembly includes a blind plate, a perforated plate and a sealing ring, specifically:

[0016] Half of the through hole of the slide assembly is an orifice plate, and the half used to cut off the medium is a blind plate. The through hole has the same size as the through hole of the lower valve body assembly and the upper valve body assembly.

[0017] The blind plate is only provided with a sealing ring groove having the same size as the through holes on the upper valve body assembly and the lower valve body assembly, and a sealing ring is installed in the sealing ring groove;

[0018] The blind plate and the orifice plate are connected together by installing the pin shaft. After removing the pin shaft, the blind plate and the orifice plate can be used separately.

[0019] Preferably, the four-eccentric synchronous clamping mechanism comprises: four eccentric shafts, four concentric shafts, and four shaft connecting rods. These structures ensure the clamping characteristics of the four-eccentric synchronous clamping mechanism, wherein:

[0020] Each eccentric shaft corresponds to a through hole passing through a lower pressure block. Each eccentric shaft is divided into four sections, and the shaft diameter of each section is different. From thick to thin, they are recorded as the first section, the second section, the third section, and the fourth section; the first section of the eccentric shaft cooperates with the lower pressure block, and the end of the thickest section has a groove for installing a retaining ring; the second section of the eccentric shaft is provided with a pin shaft hole;

[0021] The four concentric shafts pass through the through holes of the four upper pressing blocks respectively. The concentric shafts are divided into two sections. The thicker section of the concentric shaft cooperates with the upper pressing block. Grooves are provided at the ends of the thicker section and the thinner section for installing retaining rings.

[0022] The shaft connecting rod is in the shape of a channel steel, and a through hole is arranged at each end. The diameter of one through hole is the same as the diameter of the second section of the eccentric shaft, and the size of the other through hole is the same as the thinner section of the concentric shaft. Each shaft connecting rod connects a set of corresponding eccentric shafts and concentric shafts. The relative position of the concentric shaft and the upper valve body assembly is kept fixed by the shaft connecting rod, the upper pressure block and the retaining rings at the end grooves of the thicker section and the thinner section of the concentric shaft. The lower valve body assembly and the upper valve body assembly are connected by the eccentric shaft, the concentric shaft and the shaft connecting rod in the four-eccentric synchronous clamping mechanism. At the same time, the relative position of the first eccentric shaft, the second eccentric shaft and the lower valve body assembly is kept fixed by the action of the pin shaft and the retaining ring installed at the end of the thickest section of the shaft.

[0023] Preferably, the four-eccentric synchronous clamping mechanism further comprises: a first crank, a second crank, two third cranks, a crank shaft welded on the crank, two crank connecting rods, and a crank synchronous connecting rod to ensure the synchronization characteristics of the four-eccentric synchronous clamping mechanism; wherein:

[0024] On one side parallel to the sliding direction of the sliding assembly, the first crank is connected to an axle connecting rod, one end of which is connected to one end of the crank connecting rod through the crank shaft, the other end of the crank connecting rod is connected to a third crank through the crank shaft, and the third crank is connected to another axle connecting rod on the same side;

[0025] The first crank is provided with a through hole for welding the crank shaft, a through hole with keyways at both ends, a square hole, and a regular through hole, the regular through hole being matched with the second section of the corresponding eccentric shaft; one end of the driving mechanism is located in the square hole; the third crank is provided with a through hole for welding the crank shaft, a regular through hole, the regular through hole being matched with the second section of the corresponding eccentric shaft;

[0026] Similarly, on the other side parallel to the sliding direction of the sliding assembly, the second crank is connected to an axle connecting rod, one end of which is connected to one end of the crank connecting rod through the crank shaft, and the other end of the crank connecting rod is connected to the third crank through the crank shaft, and the third crank is connected to another axle connecting rod on the same side;

[0027] The second crank is provided with a through hole for welding the crank shaft, a through hole with keyways at both ends, and a regular through hole, the regular through hole being matched with the second section of the corresponding eccentric shaft, and the third crank on the side is also provided with a through hole for welding the crank shaft, a regular through hole, the regular through hole being matched with the second section of the corresponding eccentric shaft;

[0028] Four keyways are arranged at both ends of the crank synchronous connecting rod, and threaded holes are arranged at the two end faces; the crank synchronous connecting rod passes through the through holes with keyways of the first crank and the second crank, is connected to the first crank and the second crank through a flat key, and is fixed at both ends by screw-tightening shaft end retaining rings.

[0029] Preferably, the center positioning sliding guide mechanism includes a limit plate, a flanged sleeve, a valve body guide column and a handle, specifically:

[0030] The limit plates are fastened to both ends of the slide assembly by bolts. When the slide assembly slides to the position where the blind plate or the orifice plate is concentric with the through holes of the lower valve body and the upper valve body, the limit plates stick to the side of the upper valve body to limit the extreme sliding of the slide assembly.

[0031] The flanged sleeves are installed on the lower valve body and the upper valve body parallel to the two sides of the slide assembly to form two slide rails, and the sliding direction of the slide assembly is limited by the flanged sleeves;

[0032] One end of the valve body guide column is a smooth axis, and the other end is threaded, located between the lower valve body and the upper valve body, parallel to the axial direction of the through holes of the lower valve body and the upper valve body, restricting the lower valve body and the upper valve body to move only along the axial direction of the through holes on them;

[0033] The handle is mounted on the limiting plate and is used for pushing or pulling the slide plate assembly.

[0034] Preferably, the driving mechanism is a square rod wrench, the end of which is bent to match the square hole of the first crank. The first crank is rotated by rotating the wrench, and the four eccentric shafts are rotated synchronously through the combined action of the crank connecting rod and the crank synchronous connecting rod.

[0035] On both sides parallel to the sliding direction of the skateboard assembly, the eccentric shaft corresponding to one side of the wrench is the first eccentric shaft, and the eccentric shaft on the opposite side is the second eccentric shaft. The difference between the first eccentric shaft and the second eccentric shaft is only that the angle between the center line of the pin hole for connecting the crank and the connecting line of the axis of each section of the eccentric shaft is different:

[0036] If the angle between the center line of the pin hole of the first eccentric shaft and the line connecting the axis centers of its various sections is α, then the angle between the center line of the pin hole of the second eccentric shaft and the line connecting the axis centers of the various sections of the eccentric shaft is -α, ensuring that when the wrench is rotated on one side, the directions and distances of the displacements generated by the rotation of the first eccentric shaft and the second eccentric shaft on both sides are the same, and the directions and distances of the displacements transmitted to the concentric shafts through the four-axis connecting rods are also the same, thereby driving the lower valve body and the upper valve body to move closer or farther from each other, thereby achieving the loosening and clamping of the slide assembly.

[0037] Preferably, the safety lock mechanism is composed of a lock plate and a retaining spring, and is arranged on the crank connecting rod near the side of the third crank;

[0038] The lock plate is provided with a notch, a through hole and a threaded hole; a hexagon socket head cylindrical shoulder screw is passed through the through hole to cooperate with the threaded hole on the crank connecting rod, and a knurled high head screw is installed at the threaded hole of the lock plate; an elastic cylindrical pin is provided at the blind hole near the lock plate on the crank connecting rod, and two circular rings of the retaining spring are respectively sleeved on the hexagon socket head cylindrical shoulder screw and the elastic cylindrical pin on the crank connecting rod, and the other section is against the knurled high head screw;

[0039] When the four-eccentric synchronous clamping mechanism clamps the slide plate assembly, the notch of the locking plate can lock the fourth section of the eccentric shaft away from the wrench, thereby limiting the movement of the wrench; when loosening the slide plate assembly, the retaining spring must be moved first so that the notch of the locking plate no longer locks the thinnest section of the eccentric shaft before the wrench can be operated.

[0040] Compared with the prior art, the present invention has the following advantages:

[0041] (1) The present invention performs lightweight processing on parts such as the valve body, blind plate assembly, pressure block and shaft, making the structure more compact, reducing the overall size and weight, and can be applied to the use environment with strict requirements on the overall weight of the blind plate device.

[0042] (2) The present invention has specially designed a four-eccentric synchronous clamping mechanism, in which two short eccentric shafts are arranged at one end of the upper and lower valve body assemblies, and two short eccentric shafts are also arranged at the same position at the other end. Under the action of the crank synchronous connecting rod, these four short eccentric shafts replace the two long eccentric shafts of the traditional four-eccentric synchronous clamping mechanism. Through this design, the volume of the middle part of the long eccentric shaft can be avoided from conflicting with the position of the flange surface of the upper and lower valve bodies, and there is no need to increase the size of the valve body and bring additional weight.

[0043] (3) The present invention has specially designed the slide plate assembly, which consists of a blind plate and a perforated plate, which can be assembled together to facilitate rapid plugging and removal; or they can be used alone to reduce the overall weight of the device. Threaded holes are set on the side of the blind plate to facilitate air source access and realize online detection and other purposes. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0045] Figure 2 This is a front view of the overall structure of the device of the present invention;

[0046] Figure 3 It is a rear view of the overall structure of the device of the present invention;

[0047] Figure 4 It is a side view of the overall structure of the device of the present invention;

[0048] Figure 5It is a cross-sectional view of the overall structure of the device of the present invention;

[0049] Figure 6 : are cross-sectional views of the pin holes of the eccentric shafts; (a) is a cross-sectional view of the pin hole of the first eccentric shaft, and (b) is a cross-sectional view of the pin hole of the second eccentric shaft;

[0050] Figure 7 It is a cross-sectional view of a skateboard assembly of the present invention. DETAILED DESCRIPTION

[0051] The technical solution of the present invention is:

[0052] A four-eccentric blind plate quick switching device includes upper and lower valve body assemblies, a slide plate assembly, a four-eccentric synchronous clamping mechanism, a center positioning sliding guide mechanism, a driving mechanism and a safety lock mechanism. The upper valve body assembly is composed of an upper valve body and an upper pressure block. The lower valve body assembly is composed of a lower valve body and a lower pressure block. The slide plate assembly is composed of a blind plate, a hole plate and a sealing ring embedded in the grooves on both sides of the blind plate and the hole plate, wherein a threaded hole is provided on the side of the blind plate to facilitate the access of the air source and realize the purpose of online detection. The four-eccentric synchronous clamping mechanism is composed of an eccentric shaft, a concentric shaft, a shaft connecting rod, a crank, etc., and the four-eccentric synchronous clamping mechanism can be driven to quickly clamp or release the slide plate assembly by operating the driving mechanism. The center positioning sliding guide mechanism is composed of a valve body guide column, a flanged shaft sleeve, a limit plate and a handle, which can ensure that the valve bodies on both sides and the blind plate or hole plate in the middle are coaxially aligned, and the slide plate assembly can quickly slide and position along a predetermined track. The driving mechanism is a wrench. The safety lock device includes a lock plate and a retaining spring.

[0053] The technical solutions for the main functions are as follows:

[0054] (1) The present invention provides sealing ring grooves on both sides of the blind plate and the orifice plate. After the sealing ring is installed, the blind plate assembly is quickly clamped and released by the eccentric clamping mechanism driven by the sliding plate assembly and the operating driving mechanism, thereby realizing rapid connection and isolation of the medium.

[0055] (2) The upper and lower valve bodies of the present invention have basically the same appearance, with both ends being tubular structures and the middle part being a rectangular plate structure, on which a through hole having the same diameter as the tubular structure is provided. The tubular structure on one side is a pipeline flange, which is connected to the flange of the butted process system pipeline; the tubular structure on the other side is a middle flange with a sealing surface, which forms a seal with the slide assembly clamping seal ring.

[0056] (3) The present invention has specially designed a four-eccentric synchronous clamping mechanism, in which two short eccentric shafts are arranged at one end of the upper and lower valve body assemblies, and two short eccentric shafts are also arranged at the same position at the other end. Under the action of the crank synchronous connecting rod, the four short eccentric shafts replace the two long eccentric shafts of the traditional blind plate quick switching device. Through this design, the volume of the middle part of the long eccentric shaft can be avoided from conflicting with the position of the flange surface of the upper and lower valve bodies, and there is no need to increase the size of the valve body and bring additional weight.

[0057] (4) The blind plate and the orifice plate of the present invention can be assembled together or used separately. A portion of the cylinder is dug out at the center of the blind plate, a threaded hole is set on its side, and a through hole is set at the center of the threaded hole to connect to the central hollowed-out part, so as to facilitate the access of the gas source and realize the purpose of online detection, etc.

[0058] (5) The present invention only requires one operator to complete the process from clamping to loosening the slide assembly, effectively reducing time and labor costs.

[0059] like Figure 1 As shown, the device is mainly composed of a lower valve body assembly 1, an upper valve body assembly 2, a slide assembly 3, a four-eccentric synchronous clamping mechanism 4, a center positioning sliding guide mechanism 5, a driving mechanism 6 and a safety lock mechanism 7.

[0060] The shape and structure of the lower valve body assembly 1 and the upper valve body assembly 2 are basically the same, one side of which is provided with a flange to dock with the installed pipeline flange, and the other side is a sealing surface, and the lower valve body assembly 1 and the upper valve body assembly 2 are installed with the sealing surface on one side opposite to each other. The slide plate assembly 3 is located between the sealing surfaces of the lower valve body assembly 1 and the upper valve body assembly 2, and can be divided into two sections, a through hole is provided at the center of one section, and a part of the center of the other section is dug out but not hollowed out, which can play a role in cutting off the medium. The four-eccentric synchronous clamping mechanism 4 is located on both sides of the lower valve body assembly 1 and the upper valve body assembly 2, and is used to clamp the lower valve body assembly 1 and the upper valve body assembly 2; the center positioning sliding guide mechanism 5 is located around the slide plate assembly 3, which can ensure that the working positions of the lower valve body assembly 1, the upper valve body assembly 2 and the middle slide plate assembly 3 are coaxially aligned, and the slide plate assembly 3 can slide and position quickly along the predetermined track; the driving mechanism 6 is located at the edge of the four-eccentric synchronous clamping mechanism. In the present invention, the driving mechanism 6 is a square rod wrench, which cooperates with the square hole of the four-eccentric synchronous clamping mechanism 4 to drive the four-eccentric synchronous clamping mechanism 4 to clamp the lower valve body assembly 1 and the upper valve body assembly 2; the safety lock mechanism 7 is fixed to one side of the four-eccentric synchronous clamping mechanism by screws and elastic cylindrical pins. When the lower valve body assembly 1 and the upper valve body assembly 2 are clamped, the safety lock mechanism 7 can buckle the eccentric shaft. At this time, the driving mechanism 6 cannot be operated, which effectively prevents the occurrence of misoperation.

[0061] like Figure 1 and Figure 4As shown, the lower valve body assembly 1 includes a lower valve body 101 and a lower pressing block 102, and the upper valve body assembly 2 includes an upper valve body 201 and an upper pressing block 202. The lower valve body 101 and the upper valve body 201 have basically the same appearance, and the main body is a rectangular plate-like structure, and the two sides of the rectangular plate-like structure are tubular structures: a through hole with the same diameter as the tubular structure is set on the plate-like structure, wherein the tubular structure part on one side of the through hole is a pipeline flange, which is connected to the flange of the butted process system pipeline; the tubular structure on the other side is a middle flange with a sealing surface. Through threaded holes are set at both ends of the pipeline flange of the lower valve body 101, and on the side of the sealing surface, the rectangular plate is set with 4 threaded holes, and the depth is the same as the thickness of the rectangular plate; through holes are set at both ends of the pipeline flange of the upper valve body 201, and on the side of the sealing surface, the rectangular plate is set with 8 threaded holes, and the depth is the same as the thickness of the rectangular plate. Four lower pressing blocks 102 with through holes are set at the four corners of the rectangular plate structure of the lower valve body 101 by welding, and four upper pressing blocks 202 with through holes are set at the four corners of the middle rectangular plate structure of the upper valve body 201 by welding. The axial directions of the through holes on the pressing blocks are perpendicular to the sliding direction of the slide assembly 3.

[0062] like Figure 7 As shown, the slide plate assembly 3 includes a blind plate 301, an orifice plate 302 and a sealing ring 303. A through hole with the same diameter as the tubular structure of the upper valve body 101 and the lower valve body is provided in the middle position of the orifice plate 302, a sealing ring groove is provided at the edge of the through hole, and a sealing ring is installed in the sealing ring groove; only a sealing ring groove with the same diameter as the tubular structure of the upper valve body assembly and the lower valve body assembly is provided in the middle position of the blind plate 301, and a sealing ring is installed in the sealing ring groove; the blind plate 301 and the orifice plate 302 are connected together by installing a pin shaft, and after removing the pin shaft, the blind plate 301 and the orifice plate 302 can be used separately.

[0063] like Figure 2 and Figure 3As shown, the four-eccentric synchronous clamping mechanism 4 includes a first eccentric shaft 401, a second eccentric shaft 402, a concentric shaft 403, a shaft connecting rod 404, a first crank 405, a second crank 406, a third crank 407, a crank shaft 408 welded on the crank, a crank connecting rod 409, and a crank synchronous connecting rod 410. For the lower valve body assembly 1, it has two symmetry planes, and the symmetry plane perpendicular to the through-hole direction of the lower pressure block 102 is selected as the reference plane. The reference plane divides the lower valve body assembly 1 into two sides, and the driving mechanism 6, which is a wrench 601 in this device, can be located on either side. On the side where the wrench 601 is located, the first eccentric shaft 401 close to the wrench passes through the through hole of the lower pressing block 102 close to the wrench, and the first eccentric shaft 401 away from the wrench passes through the through hole of the lower pressing block 102 away from the wrench; on the opposite side of the wrench 601, the second eccentric shaft 402 close to the wrench passes through the through hole of the lower pressing block 102 close to the wrench, and the second eccentric shaft 402 away from the wrench passes through the through hole of the lower pressing block 102 away from the wrench. The first eccentric shaft 401 and the second eccentric shaft 402 are divided into four sections, each with a different shaft diameter. The thickest section of the first eccentric shaft 401 and the second eccentric shaft 402 is matched with the lower pressing block 102. There is a groove at the end of the thickest section, and a retaining ring can be installed. The second thickest section of the first eccentric shaft 401 and the second eccentric shaft 402 is provided with a pin hole. The difference between the two is that the center line of the pin hole used to connect the crank is at a different angle to the axis line connecting the sections of the eccentric shaft. Otherwise, the two are exactly the same.

[0064] The four concentric shafts 403 pass through the through holes of the four upper pressing blocks respectively. The concentric shaft 403 is divided into two sections. The thicker section of the concentric shaft 403 cooperates with the upper pressing block 202. Grooves are set at the ends of the thicker section and the thinner section for installing retaining rings.

[0065] The shape of the shaft connecting rod 404 is similar to that of a channel steel, and a through hole is set at each end position. The size of one through hole is the same as the second thick section of the first eccentric shaft 401 and the second eccentric shaft 402, and the size of the other through hole is the same as the thin section of the concentric shaft 403. The through holes of the four shaft connecting rods 404 are respectively connected: the first eccentric shaft 401 and the concentric shaft 403 close to the wrench, the first eccentric shaft 401 and the concentric shaft 403 far from the wrench, the second eccentric shaft 401 and the concentric shaft 403 close to the wrench, and the second eccentric shaft 401 and the concentric shaft 403 far from the wrench. Through the action of the shaft connecting rod 404, the upper pressing block 202, and the retaining ring at the end groove of the thick section and the thin section of the concentric shaft 403, the relative position of the concentric shaft 403 and the upper valve body assembly 2 is kept fixed. The lower valve body assembly 1 and the upper valve body assembly 2 are connected by the first eccentric shaft 401 , the second eccentric shaft 402 , the coaxial shaft 403 and the shaft connecting rod 404 in the four-eccentric synchronous clamping mechanism 4 .

[0066] like Figure 2 , Figure 3 , Figure 4 , Figure 5 The first crank 405 is provided with a through hole for welding the crank shaft 408, a through hole with keyways at both ends, a square hole, and a regular through hole; the second crank 406 is provided with a through hole for welding the crank shaft 408, a through hole with keyways at both ends, and a regular through hole; the third crank 407 is provided with a through hole for welding the crank shaft 408 and a regular through hole. The first crank 405, the second crank 406, and the third crank 407 are all opened from the side and provided with a pin hole, and the axis of the pin hole intersects the axis of the regular through hole perpendicularly. Among them, the conventional through hole of the first crank 405 cooperates with the sub-thick section of the first eccentric shaft 401 close to the wrench, the conventional through hole of the second crank 406 cooperates with the sub-thick section of the second eccentric shaft 402 close to the wrench, the conventional through hole of the third crank 407 on one side of the wrench 601 cooperates with the sub-thick section of the first eccentric shaft 401 away from the wrench 601, and the conventional through hole of the third crank 407 on the opposite side of the wrench 601 cooperates with the sub-thick section of the second eccentric shaft 402 away from the wrench 601. Four pins are used to pass through the pin holes of the crank and the shaft to keep their axial relative positions fixed. Through the action of installing retaining rings at the ends of the pins and the thickest sections of the shaft, the relative positions of the first eccentric shaft 401, the second eccentric shaft 402 and the lower valve body assembly 1 are kept fixed. The crank and the crank shaft can also be integrated, and the welding components in the present invention can all be integrally formed.

[0067] There are two crank connecting rods 409 in the device, with through holes at both ends, and a blind hole and a bolt hole. The two through holes of one crank connecting rod 409 are respectively matched with the first crank 405 and the crank shaft 408 welded to the third crank 407 on the wrench side, and the rectangular protrusion on the crank connecting rod 409 is close to the first crank 405 and faces downward, and the blind hole of the crank connecting rod 409 is installed with an elastic cylindrical pin; the two through holes of the other crank connecting rod 409 are respectively matched with the second crank 406 and the crank shaft 408 welded to the third crank 407 on the opposite side of the wrench, and the rectangular protrusion is close to the second crank 406 and faces downward. 4 keyways are set at both ends of the crank synchronous connecting rod 410, and threaded holes are set on the two end faces. The crank synchronous connecting rod 410 passes through the through holes with keyways of the first crank 405 and the second crank 406, and is connected to the first crank 405 and the second crank 406 via a flat key, and is fixed at both ends by screw-tightening shaft end retaining rings.

[0068] like Figure 2As shown, the center positioning sliding guide mechanism 5 includes a limit plate 501, a flanged sleeve 502, a valve body guide column 503 and a handle 504. The limit plate 501 is fastened to both ends of the slide assembly 3 by bolts. When the slide assembly 3 slides to the position where the blind plate 301 or the orifice plate 302 is concentric with the lower valve body 101 and the upper valve body 201, the limit plate 501 sticks to the side position of the upper valve body 201 to limit the extreme sliding position of the slide assembly 3. The flanged sleeve 502 is installed at the threaded holes of the rectangular plates of the lower valve body 101 and the upper valve body 201 by means of bolts and nuts to form two slide rails. The axial position of the slide plate assembly 3 is limited by the flanged sleeve to position the slide plate assembly 3 in the middle of the middle flange sealing surfaces of the lower valve body 101 and the upper valve body 201; one end of the valve body guide column 503 is a smooth axis and the other end is threaded, which respectively cooperate with the threaded hole of the lower valve body 101 and the through hole of the upper valve body 201, and is located between the lower valve body 101 and the upper valve body 201, parallel to the axial direction of the inner hole of the lower valve body 101 and the upper valve body 201, limiting the lower valve body 101 and the upper valve body 201 to move only along the axial direction. The handle 504 is installed on the limit plate 501, which can push or pull the slide assembly 3. The design of the center positioning sliding guide mechanism 5 can ensure that the lower valve body 101, the upper valve body 201 and the blind plate 301 or the orifice plate 302 are coaxially aligned. During push-pull operations, the slide assembly 3 can slide quickly along the predetermined track and be accurately positioned.

[0069] like Figure 1 As shown, the driving mechanism 6 in this device is a wrench 601. The wrench 601 is a square rod with a bent end to match the square hole of the first crank 405. The first crank 405 can be rotated by rotating the wrench. Through the joint action of the crank connecting rod 409 and the crank synchronous connecting rod 410, the first eccentric shaft 401 close to the wrench, the first eccentric shaft 401 far from the wrench, the second eccentric shaft 402 close to the wrench and the second eccentric shaft 402 far from the wrench can be rotated synchronously. The difference between the first eccentric shaft 401 and the second eccentric shaft 402 is that the angle between the center line of the pin hole used to connect the crank and the line connecting the axis of each section of the eccentric shaft is different, as shown in FIG. Figure 6 As shown, if the angle between the center line of the pin hole of the first eccentric shaft 401 and the line connecting the axis centers of the eccentric shaft sections is α, then the angle between the center line of the pin hole of the second eccentric shaft 402 and the line connecting the axis centers of the eccentric shaft sections is -α. Through this design, it can be ensured that when the wrench 601 is rotated on one side, the direction and distance of the displacement generated by the rotation of the first eccentric shaft 401 and the second eccentric shaft 402 on both sides are the same, and the direction and distance of the displacement transmitted to the concentric shaft 403 through the four-axis connecting rod 404 are also the same, thereby driving the lower valve body 101 and the upper valve body 201 to move closer to or away from each other, thereby realizing the loosening and clamping of the slide assembly 3.

[0070] like Figure 2As shown, the safety lock mechanism 7 is composed of a lock plate 701 and a retaining ring 702. The lock plate 701 is provided with a notch, a through hole and a threaded hole. A hexagon socket head shoulder screw passes through the through hole and cooperates with the threaded hole on the crank connecting rod 409. A knurled high head screw is installed at the threaded hole of the lock plate 701. The two rings of the retaining ring 702 are respectively sleeved on the hexagon socket head shoulder screw and the elastic cylindrical pin on the crank connecting rod, and the other section is against the knurled high head screw. When the four-eccentric synchronous clamping mechanism 4 clamps the slide plate assembly 3, the notch of the lock plate 701 can hold the thinnest section of the first eccentric shaft 401 away from the wrench, thereby limiting the movement of the wrench 601, making it unable to be operated, preventing misoperation, and ensuring safety. When the slide plate assembly 3 needs to be loosened, the retaining spring 702 must be moved first so that the notch of the locking plate 701 no longer locks the thinnest section of the first eccentric shaft 401 away from the wrench, and then the wrench 601 can be operated.

[0071] When the medium is in a connected state, the four-eccentric synchronous clamping mechanism 4 clamps the orifice plate 302 to form a seal; when the medium needs to be isolated, the blind plate 301 and the orifice plate 302 can be assembled together by installing the pin shaft, and then the retaining spring 702 is first turned to make the notch of the lock plate 701 no longer clamp the thinnest section of the first eccentric shaft 401 away from the wrench, and then the wrench 601 is operated counterclockwise to drive the four-eccentric synchronous clamping mechanism 4, so that the lower valve body 101 and the upper valve body 201 move away from each other, and the slide plate assembly 3 is released. When the four-eccentric synchronous clamping mechanism 4 completes the release step, the slide plate assembly 3 is smoothly moved in a direction perpendicular to the pipeline under the guidance of the flanged shaft sleeve 502 by pushing and pulling the handle 504, and the orifice plate 302 is moved out by the movement of the slide plate assembly 3, and the blind plate 301 is moved together until the limit plate 501 of the blind plate 301 is attached to the side position of the upper valve body 201, which indicates that the blind plate 301 has moved to the correct position. The wrench 601 is operated clockwise to drive the four-eccentric synchronous clamping mechanism 4 to clamp the blind plate 301 to form a seal, thereby realizing medium isolation.

[0072] like Figure 5 and Figure 7 As shown, a part of the cylinder is dug out at the center of the blind plate 301, the diameter of the cylinder is the diameter of the through hole, and the height of the cylinder determines the thickness of the thinnest part of the blind plate, which only needs to meet the strength requirements; threaded holes are set on the side of the blind plate 301, and a through hole is set at the center of each threaded hole, which is directly connected to the hollowed-out part in the center of the blind plate, so as to facilitate the access to the gas source and realize online detection and other purposes.

[0073] The sealing ring 303 in the present invention may also be a wound gasket, a sealing block, a non-metallic gasket, a metal gasket or a combined double seal or other sealing components.

[0074] The accompanying drawings are marked as: 1-lower valve body assembly, 2-upper valve body assembly, 3-slide plate assembly, 4-eccentric parallel connecting rod clamping mechanism, 5-center positioning sliding guide mechanism, 6-driving mechanism, 7-safety lock mechanism;

[0075] 101-lower valve body, 102-lower pressure block, 201-upper valve body, 202-upper pressure block, 301-blind plate, 302-orifice plate; 303-sealing ring, 401-first eccentric shaft, 402-second eccentric shaft, 403-concentric shaft, 404-shaft connecting rod, 405-first crank, 406-second crank, 407-third crank, 408-crank shaft, 409-crank connecting rod, 410-crank synchronous connecting rod, 501-limiting plate, 502-flanged shaft sleeve, 503-valve body guide column, 504-handle, 601-wrench, 701-locking plate, 702-circlip;

[0076] Taking the atmospheric pressure storage tank, one of the typical applications, as an example, the device involved in the present invention is set between the tank top flange and the breathing valve of the atmospheric pressure storage tank, which can quickly isolate the storage tank from the breathing valve. The device is provided with an interface, which can be connected to the detection instrument and the detection gas source. After the isolation, the portable breathing valve detection device is connected to realize the online detection of the breathing valve. Compared with the traditional offline detection method of the breathing valve, the process of hoisting and disassembling the breathing valve, transportation and returning the hoisting installation is reduced, which has great advantages in safety, convenience, environmental protection and economy, and the advantages are more obvious in the large-scale detection process. Compared with the online detection method with a detection auxiliary valve, the isolation time of the breathing valve is reduced from tens of minutes to only 3 to 5 seconds, which greatly reduces the time for the medium in the atmospheric pressure storage tank to leak into the atmosphere. It has great advantages in safety and is the best solution to meet the compliance requirements of the breathing valve for annual inspection. Therefore, it is necessary to provide a lightweight blind plate device that can not only realize the rapid switching of the pipeline conduction and blind sealing state, but also have an online detection function to meet the current requirements of industrial pipelines for lighter weight, smaller size and more functions of blind plate devices.

[0077] The invention provides a four-eccentric blind plate quick switching device, which has the advantages of simple operation, good sealing, rapid switching and light weight, and can be widely used in oil and gas valve devices, acetaldehyde recovery devices, atmospheric pressure storage tank devices, maleic anhydride heat exchanger devices and other working conditions where the weight of the blind plate is strictly controlled. Compared with the traditional 8-shaped blind plate, the device saves the tedious process of disassembling bolts and nuts, and only one person can easily and quickly complete the conversion between the through end and the blind end, which has obvious advantages in economy, safety and convenience.

[0078] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in this field.

Claims

1. A four-eccentric blind plate quick switching device, characterized in that include: A lower valve body assembly (1), an upper valve body assembly (2), a slide assembly (3), a four-eccentric synchronous clamping mechanism (4), a center positioning sliding guide mechanism (5), a driving mechanism (6) and a safety lock mechanism (7); wherein: The lower valve body assembly (1) and the upper valve body assembly (2) have the same shape and structure, and the main body is a rectangular plate structure, and the middle position thereof is a through hole; a flange is provided on one side of the through hole to butt against the flange of the installed pipeline, and the other side is a sealing surface, and the lower valve body assembly (1) and the upper valve body assembly (2) are installed with the sealing surfaces facing each other; The slide plate assembly (3) is located between the sealing surfaces of the lower valve body assembly (1) and the upper valve body assembly (2) and is capable of sliding. The slide plate assembly (3) is divided into two sections: a through hole is provided at the center of one section, and the center of the other section is not hollowed out and is used to cut off the medium. The four-eccentric synchronous clamping mechanism (4) is located on both sides of the lower valve body assembly (1) and the upper valve body assembly (2), and is used to clamp the lower valve body assembly (1) and the upper valve body assembly (2); The central positioning sliding guide mechanism (5) is located around the slide assembly (3) and is used to align the working positions of the lower valve body assembly (1), the upper valve body assembly (2) and the middle slide assembly (3) coaxially, and at the same time enable the slide assembly (3) to slide quickly and position along a predetermined track; The driving mechanism (6) is located on the four-eccentric synchronous clamping mechanism (4) and drives the four-eccentric synchronous clamping mechanism (4) to clamp the lower valve body assembly (1) and the upper valve body assembly (2); The safety lock mechanism (7) is fixed to one side of the four-eccentric synchronous clamping mechanism. When the lower valve body assembly (1) and the upper valve body assembly (2) are clamped, the safety lock mechanism (7) can make the driving mechanism (6) inoperable, thereby preventing the occurrence of erroneous operation.

2. A four-eccentric blind plate quick switching device according to claim 1, characterized in that: The lower valve body assembly (1) comprises a lower valve body (101) and a lower pressing block (102), and the upper valve body assembly (2) comprises an upper valve body (201) and an upper pressing block (202); The through hole of the lower valve body assembly (1) is equal in size to the diameter of the tubular structure; Four lower pressing blocks (102) with through holes are arranged at the four corners of the rectangular plate structure of the lower valve body (101), and four upper pressing blocks (202) with through holes are arranged at the four corners of the middle rectangular plate structure of the upper valve body (201), and the axial directions of the through holes are perpendicular to the sliding direction of the slide assembly (3).

3. A four-eccentric blind plate fast switching device according to claim 1, characterized in that: The slide plate assembly (3) includes a blind plate (301), a perforated plate (302) and a sealing ring (303), specifically: Half of the through hole of the slide assembly (3) is provided as an orifice plate (302), and the half used for cutting off the medium is a blind plate (301), and the through hole has the same size as the through holes of the lower valve body assembly (1) and the upper valve body assembly (2); The blind plate (301) is only provided with a sealing ring groove having the same size as the through holes on the upper valve body assembly and the lower valve body assembly, and a sealing ring is installed in the sealing ring groove; The blind plate (301) and the orifice plate (302) are connected together by installing a pin shaft. After the pin shaft is removed, the blind plate (301) and the orifice plate (302) can be used separately.

4. A four-eccentric blind plate fast switching device according to claim 1, characterized in that: The four-eccentric synchronous clamping mechanism (4) comprises: four eccentric shafts, four concentric shafts (403), and four shaft connecting rods (404). These structures ensure the clamping characteristics of the four-eccentric synchronous clamping mechanism, wherein: Each eccentric shaft passes through a through hole of a lower pressing block (102), and each eccentric shaft is divided into four sections, each section has a different shaft diameter, and is recorded as the first section, the second section, the third section, and the fourth section from thick to thin; the first section of the eccentric shaft cooperates with the lower pressing block (102), and the end of the thickest section has a groove for installing a retaining ring; the second section of the eccentric shaft is provided with a pin shaft hole; Four concentric shafts (403) pass through the through holes of the four upper pressing blocks respectively. The concentric shaft (403) is divided into two sections. The thicker section of the concentric shaft (403) cooperates with the upper pressing block (202). Grooves are provided at the ends of the thicker section and the thinner section for installing a retaining ring. The shaft connecting rod (404) is in the shape of a channel steel, and a through hole is arranged at each end position. The diameter of one through hole is the same as the diameter of the second section of the eccentric shaft, and the size of the other through hole is the same as the thinner section of the concentric shaft. Each shaft connecting rod (404) connects a set of corresponding eccentric shafts and concentric shafts. Through the action of the shaft connecting rod (404), the upper pressure block (202) and the retaining ring at the end grooves of the thicker section and the thinner section of the concentric shaft (403), the relative position of the concentric shaft (403) and the upper valve body assembly (2) is kept fixed. The lower valve body assembly (1) and the upper valve body assembly (2) are connected through the eccentric shaft, the concentric shaft (403) and the shaft connecting rod (404) in the four-eccentric synchronous clamping mechanism (4). At the same time, through the action of the pin shaft and the retaining ring installed at the end of the thickest section of the shaft, the relative position of the first eccentric shaft (401), the second eccentric shaft (402) and the lower valve body assembly (1) is kept fixed.

5. A four-eccentric blind plate fast switching device according to claim 4, characterized in that: The four-eccentric synchronous clamping mechanism (4) also includes: a first crank (405), a second crank (406), two third cranks (407), a crank shaft (408) welded on the crank, two crank connecting rods (409), and a crank synchronous connecting rod (410), which ensure the synchronization characteristics of the four-eccentric synchronous clamping mechanism; wherein: On a side parallel to the sliding direction of the sliding assembly (3), a first crank (405) is connected to an axial connecting rod (404), one end of which is connected to one end of a crank connecting rod (409) via a crank shaft (408), the other end of the crank connecting rod (409) is connected to a third crank (407) via the crank shaft (408), and the third crank (407) is connected to another axial connecting rod (404) on the same side; The first crank (405) is provided with a through hole for welding the crank shaft (408), a through hole with keyways at both ends, a square hole, and a regular through hole, wherein the regular through hole cooperates with the second section of the corresponding eccentric shaft; one end of the driving mechanism (6) is located in the square hole; the third crank (407) is provided with a through hole for welding the crank shaft (408), and a regular through hole, wherein the regular through hole cooperates with the second section of the corresponding eccentric shaft; Similarly, on the other side parallel to the sliding direction of the sliding assembly (3), the second crank (406) is connected to an axial connecting rod (404), one end of which is connected to one end of a crank connecting rod (409) via a crank shaft (408), and the other end of the crank connecting rod is connected to a third crank (407) via the crank shaft (408), and the third crank (407) is connected to another axial connecting rod (404) on the same side; The second crank (406) is provided with a through hole for welding the crank shaft (408), a through hole with keyways at both ends, and a regular through hole, the regular through hole being matched with the second section of the corresponding eccentric shaft, and the third crank (407) on the side is also provided with a through hole for welding the crank shaft (408), and a regular through hole, the regular through hole being matched with the second section of the corresponding eccentric shaft; Four keyways are arranged at both ends of the crank synchronous connecting rod (410), and threaded holes are arranged at two end faces; the crank synchronous connecting rod (410) passes through the through holes with keyways of the first crank (405) and the second crank (406), is connected to the first crank (405) and the second crank (406) via a flat key, and is fixed at both ends by screw-tightening shaft end retaining rings.

6. A four-eccentric blind plate fast switching device according to claim 2, characterized in that: The center positioning sliding guide mechanism (5) comprises a limit plate (501), a flanged shaft sleeve (502), a valve body guide column (503) and a handle (504), and is specifically: The limit plate (501) is fastened to both ends of the slide plate assembly (3) by bolts. When the slide plate assembly (3) slides to a position where the blind plate (301) or the orifice plate (302) is concentric with the through holes of the lower valve body (101) and the upper valve body (201), the limit plate (501) sticks to the side of the upper valve body (201) to limit the extreme sliding of the slide plate assembly (3); The flanged sleeves (502) are installed on the lower valve body (101) and the upper valve body (201) parallel to the two sides of the slide assembly (3) to form two slide rails, and the sliding direction of the slide assembly (3) is limited by the flanged sleeves; The valve body guide column (503) has a smooth axis at one end and a thread at the other end, and is located between the lower valve body (101) and the upper valve body (201), parallel to the axial direction of the through holes of the lower valve body (101) and the upper valve body (201), and restricts the lower valve body (101) and the upper valve body (201) to move only along the axial direction of the through holes thereon; The handle (504) is mounted on the limiting plate (501) and is used to push or pull the slide plate assembly (3).

7. A four-eccentric blind plate fast switching device according to claim 5, characterized in that: The driving mechanism (6) is a square rod-shaped wrench (601), the end of which is bent to match the square hole of the first crank (405). The first crank (405) is rotated by rotating the wrench, and then the four eccentric shafts are rotated synchronously through the combined action of the crank connecting rod (409) and the crank synchronous connecting rod (410); On both sides parallel to the sliding direction of the slide plate assembly (3), the eccentric shaft corresponding to one side of the wrench (601) is the first eccentric shaft (401), and the eccentric shaft on the opposite side is the second eccentric shaft (402). The difference between the first eccentric shaft (401) and the second eccentric shaft (402) is only that the angle between the center line of the pin hole for connecting the crank and the axis line of each section of the eccentric shaft is different: If the angle between the center line of the pin hole of the first eccentric shaft (401) and the line connecting the axis centers of its various sections is α, then the angle between the center line of the pin hole of the second eccentric shaft (402) and the line connecting the axis centers of the various sections of the eccentric shaft is -α, ensuring that when the wrench (601) is rotated on one side, the direction and distance of the displacement generated by the rotation of the first eccentric shaft (401) and the second eccentric shaft (402) on both sides are the same, and the direction and distance of the displacement transmitted to the concentric shaft (403) through the four-axis connecting rod (404) are also the same, thereby driving the lower valve body (101) and the upper valve body (201) to move closer to or away from each other, thereby achieving the loosening and clamping of the slide assembly (3).

8. A four-eccentric blind plate fast switching device according to claim 7, characterized in that: The safety lock mechanism (7) is composed of a lock plate (701) and a retaining spring (702), and is arranged on a crank connecting rod (409) close to a side of the third crank (407); The lock plate (701) is provided with a notch, a through hole and a threaded hole; a hexagon socket head cylindrical shoulder screw is passed through the through hole and matched with the threaded hole on the crank connecting rod (409); a knurled high head screw is installed at the threaded hole of the lock plate (701); an elastic cylindrical pin is provided at a blind hole near the lock plate (701) on the crank connecting rod (409); two circular rings of the retaining ring (702) are respectively sleeved on the hexagon socket head cylindrical shoulder screw and the elastic cylindrical pin on the crank connecting rod, and the other section is against the knurled high head screw; When the four-eccentric synchronous clamping mechanism (4) clamps the slide plate assembly (3), the notch of the locking plate (701) can lock the fourth section of the eccentric shaft away from the wrench, thereby limiting the movement of the wrench (601); when releasing the slide plate assembly (3), the retaining spring (702) must be moved first so that the notch of the locking plate (701) no longer locks the thinnest section of the eccentric shaft, and then the wrench (601) can be operated.

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