Device and method for detecting sealing performance of PTFE rubber composite gasket for butterfly valve seat

Abstract

The invention discloses a sealing performance detection device of a polytetrafluoroethylene composite gasket for a butterfly valve seat and a detection method of the sealing performance detection device, and relates to the technical field of gasket sealing performance detection. An inflation assembly and a positioning assembly are installed on the machine box body workbench. A detection assembly is cooperatively installed in the positioning assembly. The detection assembly comprises an upper die and a lower die; two semicircular plates are integrally arranged in each of the upper die and the lower die; the upper die and the lower die are movably mounted on a plurality of supporting rods through lug plates, and each supporting rod comprises a threaded section and a groove section; a shifting column is integrally arranged in a lug plate at the edge of the upper die; the shifting column is matched with a groove section formed in the supporting rod. Firstly, the gasket is placed in the groove in the placing seat, and the connecting part of the gasket is placed between the two semicircular plates, so that the semicircular plates in the upper die and the lower die are effectively attached when the upper die and the lower die are matched, and cavities in the two sides of the connecting part of the gasket are effectively filled; and the one-time overall detection effect of the gasket is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gasket sealing detection, and in particular to a sealing detection device for a butterfly valve seat four-fluorine rubber composite gasket and a detection method thereof. BACKGROUND

[0002] The four-fluorine rubber composite gasket uses four-fluorine as a medium contact layer to play the advantages of corrosion resistance, temperature resistance and low friction, and to isolate the erosion of the gasket by the medium; and uses rubber as an elastic support layer to compensate for the gap between the sealing surfaces by using the high resilience characteristics to ensure stable sealing specific pressure and to alleviate the cold flow problem of four-fluorine.

[0003] The conventional gasket sealing detection device can only effectively detect the circular or sheet-shaped gaskets during detection, but the gasket used in the butterfly valve seat has a connecting part integrally arranged inside, so that the conventional device can detect the edge position of the gasket by gas or liquid during detection, but the sealing property of the connecting part inside the gasket cannot be detected and needs to be detected again by other auxiliary equipment, which causes a large pressure difference and wind condition during detection on both sides, cannot effectively ensure the consistency of the gasket during detection on both sides, and causes defects in detection and cannot effectively ensure the detection quality of the gasket. SUMMARY

[0004] The present application aims to provide a sealing detection device for a butterfly valve seat four-fluorine rubber composite gasket and a detection method thereof, which places the gasket in the groove of the placing seat during detection, and the surfaces of the upper mold and the lower mold are attached to the placing seat, and the semicircular plates inside the upper mold and the lower mold effectively fill the cavities on both sides of the connecting part of the gasket, and then the cavity composed of the upper mold and the lower mold is inflated by the inflation head, and the pressure gauge is used to observe whether the gasket leaks or not, to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] The utility model provides a kind of sealing detection device for four fluorine rubber composite gasket of butterfly valve seat;Including cabinet body;The workbench inside the cabinet body is equipped with inflation assembly and positioning assembly;Wherein;The positioning assembly inside cooperation and installation are equipped with detection assembly;The detection assembly includes upper die and lower die;The upper die and lower die inside are integrally provided with two semicircular plates;This semicircular plate protrudes the opening end of upper die and lower die;The upper die and lower die are movably installed on a plurality of support rods by lug plate, wherein;A plurality of the support rod includes thread section and groove section;The upper die is installed with groove section;The lower die is connected with thread section;Wherein;The lug plate in the edge of the upper die is integrally provided with a push rod;The push rod is matched with the groove section of support rod;

[0007] The inflation assembly includes frame body;The frame body is fixedly installed on the workbench of cabinet body;Two symmetrical slide rails are fixedly installed on the frame body;The slide rail is movably installed with slide plate by sliding block;Inflation head is fixedly installed on the slide plate;Frame body one end fixedly installs the contact sensor of detection inflation head positioning;Wherein, movable contact is fixedly installed on the bottom of slide plate;

[0008] As a further technical solution of the utility model, the top of one of the support rods is fixedly installed with a first gear;The first gear is meshed with a second gear plate on one side;The second gear plate is movably installed with a connecting plate on the side away from the first gear through a guide rail;The connecting plate is fixedly installed on the bottom of the top plate of the cabinet body;

[0009] As a further technical solution of the utility model, the end of the second gear plate away from the first gear is meshed with a second gear;The second gear is fixedly installed on the top of a connecting rod;The connecting rod is movably installed with the top plate of the cabinet body and the frame body through bearings on both ends;The bottom of the connecting rod is also fixedly installed with a third gear;The third gear is meshed with a first gear plate;The first gear plate is fixedly installed on the bottom of the slide plate;

[0010] As a further technical solution of the utility model, the sidewall of the upper die is provided with an inflation port matched with the inflation head;The bottom of the upper die is fixedly installed with a pressure gauge;The lower die is arranged in the positioning assembly;The positioning assembly includes a base;The base is fixedly installed with a support cylinder on the workbench of the cabinet body;The support cylinder is fixedly installed with a support ring on the top through a connecting sleeve;The support ring is provided with a placing seat inside;The placing seat is provided with a groove on the edge for placing gasket;The placing seat edge is fixedly installed with the top of the support ring through Z-shaped plate and bolt;

[0011] As a further technical solution of the utility model, the bottom of the thread section of the support rod is fixedly installed in the gap between the outer edge of the placing seat and the inner wall of the support ring at the bottom of the support cylinder.

[0012] As a further technical scheme of the present application, the inflation port on the upper die is coaxially arranged with the inflation head during detection; the end of the inflation head is provided with a rubber plug; the upper die and the lower die are respectively arranged on the upper and lower sides of the placing seat;

[0013] As a further technical scheme of the present application, the top of the upper die is fixedly installed with a push rod of an electric push cylinder; the top of the electric push cylinder is installed on the top of the case body;

[0014] As a further technical scheme of the present application, the air pump is fixedly installed between the bottom of the frame body and the working tank of the case body; the air pump is electrically connected with the sensor through the controller; the controller is also electrically connected with the electric push cylinder;

[0015] As a further technical scheme of the present application, a detection method of a sealing detection device for a four-fluorine rubber composite gasket of a butterfly valve seat comprises the following steps:

[0016] S1, open the side door of the case body, and place the gasket to be detected in the groove opened in the placing seat; when placing, the connecting part in the middle of the gasket is placed in the middle position of the semicircular plates in the upper die and the lower die;

[0017] S2, realize the work of the electric push cylinder through the controller; the electric push cylinder drives the upper die to move downward along the support rod; when the upper die moves, the push rod in the ear plate at the edge of the upper die cooperates with the groove section to realize the rotation of the support rod, and at the same time, the lower die of the threaded section of the support rod moves upward to realize that the upper die and the lower die respectively fit the top surface and the bottom surface of the placing seat; at the same time, the semicircular plates in the upper die and the lower die fit each other to effectively fill the cavities on both sides of the connecting part of the gasket;

[0018] S3, when the upper die and the lower die move synchronously along the plurality of support rods, the first gear installed on one of the support rods drives the second tooth plate to move; the second tooth plate moves along the guide rail away from the side of the first gear away from the upper die; at the same time, the second tooth plate realizes that the first tooth plate drives the sliding plate to move along the sliding rail to the side of the positioning assembly through the second gear and the third gear installed on the connecting rod;

[0019] S4, during the movement of the sliding plate, after the movable contact at the bottom of the sliding plate contacts the sensor, the sensor realizes that the air pump inflates the cavity between the upper die and the lower die through the inflation head and the inflation port through the controller;

[0020] S5, during the inflation, the air pressure is observed through the pressure gauge at the top of the upper die; after the air pressure reaches a certain value, the air pump stops working, and the cavities in the upper die and the lower die are pressure-kept; during the pressure-keeping process, the worker observes the change of the pressure gauge to effectively judge the quality of the gasket;

[0021] S6, after the detection is completed, first, the inside of the upper die and the lower die is depressurized through the air pump, then the upper die is driven to move upward by the electric push cylinder, and the lower die and the inflation head move synchronously to the side away from the upper die, so that the gasket after detection is taken out and replaced;

[0022] Compared with the prior art, the present application has the following advantages:

[0023] 1. In use, first, the gasket is placed in the groove in the placing seat, and the connecting part of the gasket is placed between the two semicircular plates, so that the semicircular plates inside the upper die and the lower die are effectively attached when the upper die and the lower die are matched, and the cavities on both sides of the gasket connecting part are effectively filled, facilitating one-time overall detection of the gasket;

[0024] 2. In detection, the upper die is driven by the electric push cylinder to move downward along the groove section on the plurality of support rods through the lug plate, when the lug plate moves, the lug plate inside the lug plate drives the groove section to rotate the support rod, when the support rod rotates, the threaded section of the support rod is matched with the thread inside the lug plate of the lower die, the lower die moves upward along the plurality of support rods, the upper die and the lower die are attached to the top and bottom of the placing seat at the same time, and the semicircular plates are attached to each other, thereby effectively detecting the sealed cavity through the stroke of the upper die and the lower die;

[0025] 3. In the synchronous movement of the upper die and the lower die, the first gear installed on one of the support rods is matched with the second tooth plate inside, so that the second tooth plate moves along the guide rail to one side, the end of the second tooth plate away from the first gear is engaged with the second gear, and the second gear is coaxially provided with the third gear through the connecting rod to realize the synchronous rotation effect;

[0026] 4. In the rotation of the third gear, the third gear is engaged with the first tooth plate on the bottom of the sliding plate, so that the sliding plate moves along the slide rail to one side of the positioning assembly, in the process of moving the sliding plate, the movable contact on the bottom of the sliding plate is in contact with the contact on the sensor, at this time, the inflation head on the sliding plate is inserted into the inflation port on the side wall of the upper die, the sensor sends a stop signal to the controller, the controller realizes that the air pump forms a cavity in the upper die and the lower die through the inflation head, in the process of inflation, the pressure gauge is observed, after the pressure reaches a certain value, the air pump stops working and effectively maintains the pressure;

[0027] 5. In the present invention, during the pressure maintaining process, the staff observes the value on the pressure gauge. When the pressure on the pressure gauge drops, it proves that the gasket being tested is leaking. When the pressure gauge does not change, the surface gasket is qualified. After the inspection is completed, the cavity formed by the upper mold and the lower mold is first depressurized by the air pump and the inflation head, and then the upper mold is driven to move upward by the electric push cylinder. At this time, the ear plate of the lower mold is moved downward by cooperating with the threaded section, and at the same time, the first gear on the top of the support rod cooperates with the second tooth plate to move in the opposite direction. At the same time, the engagement between the third gear and the first tooth plate is realized, so that the slide plate drives the inflation head away from the inflation port opened on the upper mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0029] Figure 2 In the present invention Figure 1 Schematic diagram of the internal structure;

[0030] Figure 3 In the present invention Figure 2 The main view;

[0031] Figure 4 In the present invention Figure 2 Another perspective structural diagram;

[0032] Figure 5 In the present invention Figure 2 Schematic diagram of the internal structure assembly;

[0033] Figure 6 In the present invention Figure 5 Another perspective structural diagram;

[0034] Figure 7 In the present invention Figure 5 Schematic diagram of the splitting;

[0035] Figure 8 In the present invention Figure 7 Bottom view of the bottom structure of the detection component;.

[0036] Figure 9 In the present invention Figure 8 Another perspective top view;

[0037] Figure 10 In the present invention Figure 6 Assembly diagram of the positioning component and the detection component;

[0038] Figure 11 In the present invention Figure 10 Right view of;

[0039] Figure 12 This inventionFigure 11 A-A sectional view in the middle;

[0040] Figure 13 is the positioning assembly in the present application Figure 11 Right view of the positioning assembly in the middle;

[0041] Figure 14 is the positioning assembly in the present application Figure 13 B-B sectional view in the middle;

[0042] Figure 15 is the positioning assembly in the present application Figure 13 Another perspective split schematic view in the middle;

[0043] Figure 16 is the positioning assembly in the present application Figure 5 Local structure enlargement view at C in the middle;

[0044] Figure 17 is the positioning assembly in the present application Figure 6 Local structure enlargement view at D in the middle;

[0045] Figure 18 is the positioning assembly in the present application Figure 9 Local structure enlargement view at E in the middle.

[0046] In the figure: 1 - cabinet body, 2 - electric push cylinder, 3 - inflation assembly, 30 - frame body, 31 - air pump, 32 - slide rail, 33 - slide plate, 34 - inflation head, 35 - first toothed plate, 36 - sensor, 4 - positioning assembly, 40 - base, 41 - support cylinder, 42 - connected sleeve, 43 - placing seat, 44 - support ring, 5 - detection assembly, 50 - upper die, 51 - pressure gauge, 52 - support rod, 53 - first gear, 54 - second toothed plate, 55 - second gear, 56 - guide rail, 57 - connecting rod, 58 - connecting plate, 59 - semicircular plate, 510 - third gear, 511 - ear plate, 512 - lower die, 513 - inflation port, 514 - threaded segment, 515 - recess segment, 516 - shifting column, 6 - gasket. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0048] Please refer to Figures 1-10The utility model discloses a butterfly valve seat four fluorine rubber composite gasket's leakproofness detection device, including the machine box body 1, the workstation inside the machine box body 1 is equipped with the inflation assembly 3 and the positioning assembly 4, wherein, the positioning assembly 4 inside cooperation and installation have detection assembly 5, detection assembly 5 includes upper die 50 and lower die 512, the upper die 50 and lower die 512 inside all are integrally provided with two semicircular plates 59, and the semicircular plate 59 protrudes the opening end of upper die 50 and lower die 512, the upper die 50 and lower die 512 all are through the ear plate 511 movable installation on a plurality of support rods 52, wherein, a plurality of support rods 52 includes screw thread section 514 and recess section 515, the upper die 50 is installed with recess section 515 cooperation, and lower die 512 is connected with screw thread section 514 cooperation, wherein, the ear plate 511 of upper die 50 edge is integrally provided with the push rod 516, and the push rod 516 is connected with the recess section 515 of the groove section 515 of support rod 52,

[0049] The inflation assembly 3 includes the frame body 30, and the frame body 30 is fixedly installed on the workstation of the machine box body 1, two symmetrical slide rails 32 are fixedly installed on the frame body 30, a sliding plate 33 is movably installed on the slide rail 32 through a sliding block, an inflation head 34 is fixedly installed on the sliding plate 33, a contact sensor 36 for positioning the inflation head 34 is fixedly installed on one end of the frame body 30, and a movable contact is fixedly installed at the bottom of the sliding plate 33,

[0050] One of the support rods 52 is fixedly installed with a first gear 53, the first gear 53 is meshed with a second toothed plate 54 on one side, the second toothed plate 54 is movably installed on the connecting plate 58 through a guide rail 56 on the side away from the first gear 53, and the connecting plate 58 is fixedly installed at the bottom of the top plate of the machine box body 1.

[0051] By adopting the above technical scheme, when in use, the gasket 6 is placed in the groove in the placing seat 43, and the connecting portion of the gasket 6 is placed between the two semicircular plates 59, so that the semicircular plates 59 in the upper die 50 and the lower die 512 are closely fitted when the upper die 50 and the lower die 512 are matched, the cavities on both sides of the connecting portion of the gasket 6 are effectively filled, and the one-time overall detection effect of the gasket 6 is facilitated.

[0052] Please refer to Figures 1-18In the embodiment, one end of the second toothed plate 54 away from the first gear 53 is meshed and connected with the second gear 55; the second gear 55 is fixedly installed on the top of the connecting rod 57; the connecting rod 57 is movably installed on the top plate of the cabinet body 1 and the frame body 30 through bearings at two ends thereof; the third gear 510 is further fixedly installed on the bottom of the connecting rod 57; the third gear 510 is meshed and connected with the first toothed plate 35; and the first toothed plate 35 is fixedly installed on the bottom of the sliding plate 33.

[0053] In the embodiment, the side wall of the upper die 50 is provided with the inflation port 513 matched with the inflation head 34; the pressure gauge 51 is fixedly installed on the bottom of the upper die 50; the lower die 512 is arranged inside the positioning assembly 4; the positioning assembly 4 comprises the base 40; the base 40 is fixedly installed on the workbench of the cabinet body 1 at the bottom; the support cylinder 41 is fixedly installed on the base 40; the support ring 44 is fixedly installed on the top of the support cylinder 41 through the connecting sleeve 42; the placing seat 43 is arranged inside the support ring 44; the recess for placing the gasket 6 is formed on the placing seat 43; and the edge of the placing seat 43 is fixedly installed on the top of the support ring 44 through the Z-shaped plate and the bolt.

[0054] By adopting the above technical scheme, when detecting, the upper die 50 is driven by the electric push cylinder 2 to move downward along the groove segment 515 on the plurality of support rods 52 through the lug plate 511; when the lug plate 511 moves, the rotating rod 516 inside the lug plate 511 drives the groove segment 515 to rotate the support rod 52; when the support rod 52 rotates, the threaded segment 514 of the support rod 52 is matched with the thread inside the lug plate 511 of the lower die 512 to move the lower die 512 upward along the plurality of support rods 52, so as to realize that the upper die 50 and the lower die 512 are simultaneously attached to the top and the bottom of the placing seat 43; at the same time, the semicircular plates 59 are attached to each other, so as to effectively seal the cavity through the stroke detection of the upper die 50 and the lower die 512.

[0055] Furthermore, the top of the plurality of support rods 52 is movably installed on the top plate of the cabinet body 1; when the upper die 50 and the lower die 512 move synchronously, the first gear 53 installed on one of the support rods 52 is synchronously matched with the inside of the second toothed plate 54, so that the second toothed plate 54 moves to one side along the guide rail 56; one end of the second toothed plate 54 away from the first gear 53 is meshed with the second gear 55; and the second gear 55 is coaxially provided with the third gear 510 through the connecting rod 57 to realize the synchronous rotation effect.

[0056] In the embodiment, the threaded segment 514 of the support rod 52 is fixedly installed on the bottom of the support cylinder 41 through the gap between the outer edge of the placing seat 43 and the inner wall of the support ring 44.

[0057] The inflation port 513 on the upper die 50 is coaxially arranged with the inflation head 34 during detection; the end of the inflation head 34 is provided with a rubber plug; the upper die 50 and the lower die 512 are respectively located on the upper and lower sides of the placing seat 43;

[0058] By adopting the technical scheme, when the third gear 510 rotates, the third gear 510 meshes with the first toothed plate 35 at the bottom of the sliding plate 33, so that the sliding plate 33 moves along the slide rail 32 to one side of the positioning assembly 4; during the movement of the sliding plate 33, the movable contact at the bottom of the sliding plate 33 contacts the contact on the sensor 36; at this time, the inflation head 34 on the sliding plate 33 is inserted into the inflation port 513 arranged on the side wall of the upper die 50; the sensor 36 sends a stop signal to the controller; the controller controls the air pump 31 to pressurize and inflate the cavity formed by the upper die 50 and the lower die 512 through the inflation head 34; during the inflation process, the pressure gauge 51 is observed; when the pressure reaches a certain value, the air pump 31 stops working and effectively maintains the pressure;

[0059] In the embodiment, the top of the upper die 50 is fixedly installed with the push rod of the electric push cylinder 2; the top of the electric push cylinder 2 is installed on the top of the case body 1;

[0060] The bottom of the frame body 30 is fixedly installed with the air pump 31 between the case body 1 and the working table; the air pump 31 is electrically connected with the sensor 36 through the controller; the controller is also electrically connected with the electric push cylinder 2;

[0061] By adopting the technical scheme, during the pressure maintaining process, when the pressure of the pressure gauge 51 decreases, it is proved that the detected gasket 6 has a leakage; when the pressure gauge 51 has no change, the surface gasket 6 is qualified; after the detection is completed, the cavity formed by the upper die 50 and the lower die 512 is depressurized through the air pump 31 and the inflation head 34; then the upper die 50 is moved upward by the electric push cylinder 2; at this time, the ear plate 511 of the lower die 512 is moved downward by cooperating with the threaded section 514; the first gear 53 at the top of the supporting rod 52 cooperates with the second toothed plate 54 to move in the opposite direction; meanwhile, the inflation head 34 is moved away from the inflation port 513 arranged on the upper die 50 by the meshing between the third gear 510 and the first toothed plate 35;

[0062] A detection method of a butterfly valve seat four-fluorine rubber composite gasket sealing detection device, comprising the following steps:

[0063] S1, open the side door of the case body 1, and place the gasket 6 to be detected in the groove arranged in the placing seat 43; during the placing, the connecting part in the middle of the gasket 6 is placed at the middle position of the semicircular plate 59 inside the upper die 50 and the lower die 512;

[0064] S2, the electric push cylinder 2 is driven to move the upper die 50 downward along the support rod 52, when the upper die 50 moves, the push rod 516 in the lug plate 511 on the edge of the upper die 50 cooperates with the groove section 515 to realize the rotation of the support rod 52, and the threaded section 514 of the support rod 52 is moved upward, the upper die 50 and the lower die 512 are respectively attached to the top and bottom surfaces of the placing seat 43, and the semicircular plates 59 in the upper die 50 and the lower die 512 are attached to each other, so that the cavities on both sides of the connecting part of the gasket 6 are effectively filled;

[0065] S3, when the upper die 50 and the lower die 512 move synchronously along the plurality of support rods 52, the first gear 53 installed on one of the support rods 52 drives the second toothed plate 54 to move, the second toothed plate 54 moves away from the side of the first gear 53 along the guide rail 56, and the second toothed plate 54 drives the first toothed plate 35 to move the sliding plate 33 along the sliding rail 32 to one side of the positioning assembly 4 through the second gear 55 and the third gear 510 installed on the connecting rod 57;

[0066] S4, during the movement of the sliding plate 33, the movable contact at the bottom of the sliding plate contacts the sensor 36, and the sensor 36 realizes inflation of the cavity between the upper die 50 and the lower die 512 through the air pump 31 and the inflation head 34 and the inflation port 513 through the controller;

[0067] S5, during inflation, the air pressure is observed through the pressure gauge 51 on the top of the upper die 50, and when the air pressure reaches a certain value, the air pump 31 stops working, and the cavity in the upper die 50 and the lower die 512 is pressure maintained, during the pressure maintaining process, the worker observes the change of the pressure gauge 51, which can effectively judge the quality of the gasket 6;

[0068] S6, after the detection is completed, the pressure in the upper die 50 and the lower die 512 is released through the air pump 31, and then the upper die 50 is moved upward through the electric push cylinder 2, and the lower die 512 and the inflation head 34 are moved away from the upper die 50 at the same time, so as to facilitate the taking out and replacement of the detected gasket 6;

[0069] The working principle of the application is: in use, first, the gasket 6 is placed in the groove in the placing seat 43, and the connecting part of the gasket 6 is placed between the two semicircular plates 59, so that the semicircular plates 59 in the upper die 50 and the lower die 512 are attached to each other when the upper die 50 and the lower die 512 cooperate, the cavities on both sides of the connecting part of the gasket 6 are effectively filled, and the one-time overall detection effect of the gasket 6 is facilitated;

[0070] In the detection, the upper die 50 is driven by the electric push cylinder 2 to move downward along the groove section 515 on the plurality of support rods 52 through the lug plate 511. When the lug plate 511 moves, the shift column 516 inside the lug plate 511 shifts the groove section 515 to realize the rotation of the support rod 52. When the support rod 52 rotates, the threaded section 514 of the support rod 52 cooperates with the thread inside the lug plate 511 of the lower die 512 to realize the upward movement of the lower die 512 along the plurality of support rods 52, so that the upper die 50 and the lower die 512 are simultaneously attached to the top and bottom of the placement seat 43, and the semicircular plates 59 are attached to each other, thereby effectively sealing the cavity through the stroke detection of the upper die 50 and the lower die 512.

[0071] When the upper die 50 and the lower die 512 move synchronously, the first gear 53 installed on one of the support rods 52 synchronously cooperates with the inside of the second toothed plate 54, so that the second toothed plate 54 moves along the guide rail 56 to one side. The end of the second toothed plate 54 away from the first gear 53 is engaged with the second gear 55, and the second gear 55 is coaxially provided with the third gear 510 through the connecting rod 57 to realize the synchronous rotation effect.

[0072] When the third gear 510 rotates, the third gear 510 is engaged with the first toothed plate 35 on the bottom of the sliding plate 33 to realize the movement of the sliding plate 33 along the sliding rail 32 to one side of the positioning assembly 4. In the process of moving the sliding plate 33, the movable contact on the bottom of the sliding plate 33 contacts the contact on the sensor 36. At this time, the inflation head 34 on the sliding plate 33 is inserted into the inflation port 513 on the side wall of the upper die 50, the sensor 36 sends a stop signal to the controller, and the controller realizes that the air pump 31 pressurizes and inflates the cavity formed by the upper die 50 and the lower die 512 through the inflation head 34. In the process of inflation, the pressure gauge 51 is observed, and when the pressure reaches a certain value, the air pump 31 stops working and effectively maintains the pressure.

[0073] In the process of maintaining the pressure, the worker observes the value on the pressure gauge 51. When the pressure of the pressure gauge 51 decreases, it proves that the detected gasket 6 has a leakage. When the pressure gauge 51 does not change, it means that the surface gasket 6 is qualified. After the detection is completed, the cavity formed by the upper die 50 and the lower die 512 is first depressurized through the air pump 31 and the inflation head 34, and then the upper die 50 is moved upward by the electric push cylinder 2. At this time, the lug plate 511 of the lower die 512 moves downward through the cooperation with the threaded section 514, and the first gear 53 on the top of the support rod 52 cooperates with the second toothed plate 54 to move in the opposite direction. At the same time, through the engagement between the third gear 510 and the first toothed plate 35, the sliding plate 33 drives the inflation head 34 to move away from the inflation port 513 on the upper die 50.

[0074] After the upper mold 50 and the lower mold 512 are separated, the workers take out the gaskets 6 for which the detection is completed, and recycle the above steps to realize the detection of the sealing property of the remaining gaskets 6.

[0075] It is obvious to a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than the above description, and it is therefore intended that all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced by the application. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0076] Furthermore, it should be understood that although the present specification describes exemplary embodiments, not every exemplary embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A sealing detection device for a polytetrafluoroethylene composite gasket for a butterfly valve seat, characterized by: The invention comprises a chassis (1); an inflation component (3) and a positioning component (4) are installed on a workbench inside the chassis (1); wherein a detection component (5) is installed inside the positioning component (4); the detection component (5) comprises an upper mold (50) and a lower mold (512); two semicircular plates (59) are integrally provided inside the upper mold (50) and the lower mold (512); the semicircular plates (59) protrude from the open ends of the upper mold (50) and the lower mold (512); the upper mold (50) and the lower mold (512) are provided with a plurality of semicircular plates (59 ... 512) are movably mounted on a plurality of support rods (52) through ear plates (511), wherein the plurality of support rods (52) include threaded sections (514) and groove sections (515); the upper die (50) is mounted in cooperation with the groove sections (515); the lower die (512) is connected in cooperation with the threaded sections (514); wherein a shifting post (516) is integrally provided in the ear plate (511) at the edge of the upper die (50); the shifting post (516) is engaged with the groove sections (515) provided on the support rods (52); The inflation component (3) includes a frame (30); the frame (30) is fixedly mounted on the workbench of the chassis (1); two symmetrical slide rails (32) are fixedly mounted on the frame (30); a slide plate (33) is movably mounted on the slide rail (32) via a slider; an inflation head (34) is fixedly mounted on the slide plate (33); a contact sensor (36) for detecting the positioning of the inflation head (34) is fixedly mounted on one end of the frame (30); wherein the movable contact is fixedly mounted on the bottom of the slide plate (33).

2. The sealing detection device for a polytetrafluoroethylene composite gasket for a butterfly valve seat according to claim 1, characterized in that: A first gear (53) is fixedly mounted on the top of one of the support rods (52); one side of the first gear (53) is meshedly connected with a second tooth plate (54); a side of the second tooth plate (54) away from the first gear (53) is movably mounted on a connecting plate (58) via a guide rail (56); and the top of the connecting plate (58) is fixedly mounted on the bottom of the top plate of the chassis (1).

3. The sealing detection device for a polytetrafluoroethylene composite gasket for a butterfly valve seat according to claim 2, characterized in that: The end of the second toothed plate (54) away from the first gear (53) is meshed with the second gear (55); the second gear (55) is fixedly mounted on the top of the connecting rod (57); the two ends of the connecting rod (57) are movably mounted on the top plate and the frame (30) of the chassis (1) through bearings; a third gear (510) is also fixedly mounted on the bottom of the connecting rod (57); the third gear (510) is meshed with the first toothed plate (35); the first toothed plate (35) is fixedly mounted on the bottom of the slide (33).

4. The sealing detection device for a polytetrafluoroethylene composite gasket for a butterfly valve seat according to claim 1, characterized in that: The side wall of the upper mold (50) is provided with an inflation port (513) that cooperates with the inflation head (34); a pressure gauge (51) is fixedly installed on the bottom of the upper mold (50); the lower mold (512) is arranged inside the positioning assembly (4); the positioning assembly (4) includes a base (40); the bottom of the base (40) is fixedly installed on the workbench of the chassis (1); a support tube (41) is fixedly installed on the base (40); a support ring (44) is fixedly installed on the top of the support tube (41) through a one-piece sleeve (42); a placement seat (43) is provided inside the support ring (44); a groove is provided on the placement seat (43) for facilitating the placement of the gasket (6); the edge of the placement seat (43) is fixedly installed with the top of the support ring (44) through a Z-shaped plate and bolts.

5. The sealing detection device for a tetrafluororubber composite gasket for a butterfly valve seat according to claim 4, characterized in that: The bottom of the support rod (52) is a threaded section (514) that passes through the gap between the outer edge of the placement seat (43) and the inner wall of the support ring (44) and is fixedly installed on the bottom of the support tube (41).

6. The sealing detection device for a polytetrafluoroethylene composite gasket for a butterfly valve seat according to claim 5, characterized in that: The inflation port (513) on the upper mold (50) is coaxially arranged with the inflation head (34) during testing; a rubber plug is provided at the end of the inflation head (34); the upper mold (50) and the lower mold (512) are respectively located on the upper and lower sides of the placement seat (43).

7. The sealing detection device for a polytetrafluoroethylene composite gasket for a butterfly valve seat according to claim 6, characterized in that: The top of the upper die (50) is fixedly mounted on the push rod of the electric push cylinder (2); the top of the electric push cylinder (2) is mounted on the top of the chassis (1).

8. The sealing detection device for a polytetrafluoroethylene composite gasket for a butterfly valve seat according to claim 7, characterized in that: An air pump (31) is fixedly installed between the bottom of the frame (30) and the working surface of the chassis (1); the air pump (31) is electrically connected to the sensor (36) through a controller; and the controller is also electrically connected to the electric push cylinder (2).

9. A method for detecting the sealing performance of a polytetrafluoroethylene (PTFE) rubber composite gasket for a butterfly valve seat according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Open the side door of the chassis (1), and place the gasket (6) to be tested in the groove provided inside the placement seat (43). When placing the gasket (6), the connecting portion in the middle is placed in the middle position of the semicircular plate (59) inside the upper mold (50) and the lower mold (512); S2. The electric push cylinder (2) is operated by the controller, and the electric push cylinder (2) drives the upper mold (50) to move downward along the support rod (52). When the upper mold (50) moves, the shifting post (516) in the ear plate (511) at the edge of the upper mold (50) cooperates with the groove section (515) to realize the rotation of the support rod (52), and at the same time, the lower mold (512) of the threaded section (514) of the support rod (52) moves upward, so that the upper mold (50) and the lower mold (512) are respectively fitted with the top and bottom surfaces of the placement seat (43). At the same time, the semicircular plates (59) inside the upper mold (50) and the lower mold (512) are fitted with each other, so that the cavities on both sides of the connecting part of the gasket (6) are effectively filled; S3. When the upper mold (50) and the lower mold (512) move synchronously along the plurality of support rods (52), the first gear (53) installed on one of the support rods (52) drives the second tooth plate (54) to move, and the second tooth plate (54) moves along the guide rail (56) toward the side of the first gear (53) away from the upper mold (50). At the same time, the second tooth plate (54) realizes the first tooth plate (35) driving the slide plate (33) to move along the slide rail (32) toward the side of the positioning assembly (4) through the second gear (55) and the third gear (510) installed on the connecting rod (57); S4, when the slide plate (33) moves, the movable contact at the bottom of the slide plate contacts the sensor (36), and the sensor (36) controls the air pump (31) to inflate the cavity between the upper mold (50) and the lower mold (512) through the inflation head (34) and the inflation port (513); S5. During inflation, the air pressure is observed through the pressure gauge (51) on the top of the upper mold (50). After reaching a certain pressure, the air pump (31) stops working and the pressure in the cavity inside the upper mold (50) and the lower mold (512) is maintained. During the pressure maintenance process, the staff observes the changes in the pressure gauge (51) to effectively judge the quality of the gasket (6); S6. After the inspection is completed, the air pump (31) is used to depressurize the interior of the upper mold (50) and the lower mold (512), and then the electric push cylinder (2) drives the upper mold (50) to move upward. Similarly, the lower mold (512) and the inflation head (34) are synchronously moved to the side away from the upper mold (50), so that the gasket (6) that has been inspected can be taken out and replaced.

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