A plastic valve sealing detection device

Abstract

The present invention relates to the field of valve testing technology, and specifically proposes a plastic valve sealing test device, comprising a test bench, a supporting mechanism, an inflation test mechanism, a pressure sealing mechanism, a sealing locking mechanism, and a guide mechanism. The present invention achieves reverse pressure sealing at both ends of the valve by cooperating with the pressure sealing mechanism, the sealing locking mechanism, and the guide mechanism, thereby achieving a bidirectional pressure sealing effect at both ends of the valve, greatly improving the sealing performance and accuracy of the valve during testing. Furthermore, when the valve is placed, the supporting mechanism horizontally positions and supports the valve axis, thereby not only improving the accuracy of sealing at both ends of the valve, but also avoiding the problem of damaging the valve during sealing.

Description

Technical Field

[0001] The invention relates to the technical field of valve detection, and particularly proposes a plastic valve sealing detection device. Background Art

[0002] Testing the sealing performance of plastic valves is a critical step in ensuring they do not leak during use. Currently, testing the sealing performance of plastic valves involves directly sealing both ends of the valve using a sealing and inflation device. The valve is then immersed in water and inflated with air to observe whether bubbles form in the water, thereby determining whether the valve is qualified.

[0003] However, the above detection process still has the following problems: 1. The sealing operation at both ends of the valve is carried out on the basis of manual continuous holding of the valve for positioning. In this way, the valve may be offset due to human factors such as unstable manual support, which may cause the sealing fixing mechanism to squeeze and damage the plastic valve when pressing and sealing the valve, making it impossible to carry out the valve sealing test; 2. Both ends of the valve are only subjected to the guide pressure. Once the sealing pressure is insufficient, it will directly lead to inaccurate valve detection. Therefore, the sealing effect of the sealing and inflation equipment on both ends of the valve needs to be improved. Summary of the Invention

[0004] In view of the above problems, an embodiment of the present invention provides a plastic valve sealing detection device to solve the technical problems in the related art.

[0005] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides the following technical solution: a plastic valve sealing detection device, including a test bench, one side of which is an immersion test box, a lifting drive mechanism is installed in the immersion test box, a U-shaped frame is installed on the top of the lifting drive mechanism, and a support mechanism for horizontally supporting and axially positioning the valve is installed on the horizontal section of the U-shaped frame.

[0006] A fixed plate and a hydraulic cylinder are installed on the U-shaped frame. A movable plate concentric with the fixed plate is installed at the telescopic end of the hydraulic cylinder. An inflation test mechanism for inflating the valve is installed between the fixed plate and the movable plate.

[0007] A pressing seal which slides along the axial direction is installed on the fixed disk, a pressing seal is also fixedly installed on the movable disk, and a sealing gasket is installed on the pressing seal.

[0008] In one possible implementation, the vertical cross-section of the pressure seal is convex with the small diameter end toward the middle of the U-shaped frame, and the end of the small diameter section of the pressure seal is conical to facilitate the insertion of the pressure seal into the end of the valve, and the sealing gasket is arranged at the transition position between the large diameter end and the small diameter end of the pressure seal.

[0009] The pressure sealing mechanism includes pressure rods slidably mounted on the fixed disk and evenly arranged along its circumference. The pressure rods are connected to corresponding pressure sealing members, and a connecting ring is commonly installed at one end of the multiple pressure rods away from the pressure sealing members.

[0010] The sealing locking mechanism includes a moving ring and a moving rod installed on one side of the moving ring and evenly arranged along its circumference. One end of the moving rod slides through the moving disk and is slidably installed with an outer resistance plate through an elastic connecting piece. The horizontal section of the U-shaped frame is installed with a retraction guide that adaptively drives the outer resistance plate to move toward the valve axis. An elastic limiter (such as a spring) is installed between the moving ring and the moving disk. The elastic connecting piece (such as a spring) is used to drive the outer resistance plate to reset when the outer resistance plate is disengaged from the retraction guide.

[0011] In one possible implementation, the fixed disk is also equipped with a reverse pressure member, which includes a plurality of T-shaped pressure rods, which are evenly arranged along the circumference of the fixed disk and slide through the fixed disk. The pressure seal is located between the plurality of T-shaped pressure rods arranged circumferentially, and the end face of the fixed disk close to the vertical section of the U-shaped frame is provided with a plurality of circumferentially evenly arranged push rods, the middle part of the push rod is hinged to the fixed disk, the T-shaped pressure rod is used to push one end of the push rod to rotate the push rod, and the other end of the push rod is used to push the connecting ring to move linearly.

[0012] A guide mechanism is installed on the immersion test box. The guide mechanism is used to guide and drive the connecting ring to move toward the fixed disk and guide and drive the moving ring to move away from the moving disk when the U-shaped frame moves downward, thereby applying bidirectional sealing pressure to both ends of the valve.

[0013] In one possible implementation, the retraction guide includes a guide ring, the inner ring surface of the guide ring is conical with a diameter gradually increasing toward the movable disk, a guide groove is provided in the horizontal section of the U-shaped frame, a support seat fixedly connected to the guide ring is slidably connected to the guide groove, the support seat is connected to the inner wall of the guide groove by a reset spring, and a ball is rollingly installed on the end of the outer plate away from the axis of the movable disk.

[0014] In one possible implementation, the guide mechanism includes four guide bars arranged in a rectangular shape, and the side walls of the connecting ring and the movable ring are both equipped with fixed frames symmetrically arranged along the width direction of the U-shaped frame, and guide rods are installed on the fixed frames. The guide bars correspond to the guide rods one by one, and the guide bars and guide rods on the same side are distributed alternately, and an inclined surface inclined toward the guide rod is provided on the upper end of the guide bar close to the side of the corresponding guide rod.

[0015] In a possible implementation, the fixing frame is Y-shaped, both ends of the Y-shaped opening of the fixing frame are connected to corresponding connecting rings or movable rings, and the guide rod is connected to the other end side wall of the fixing frame.

[0016] In one possible implementation, the supporting mechanism includes two supporting seats, Z-shaped connecting rods are installed on the opposite surfaces of the two supporting seats, a fixed box is installed on the horizontal section of the U-shaped frame, the Z-shaped connecting rod slides away from the end of the corresponding supporting seat and passes through the fixed box, and a limiting spring is installed between the Z-shaped connecting rod and the inner wall of the fixed box.

[0017] In one possible implementation, a drainage channel penetrating the U-shaped frame is provided at the lower end of the guide groove.

[0018] In one possible implementation, a mounting seat is installed on the horizontal section of the U-shaped frame, a pull rod is slidably connected to the mounting seat, and a hinged rod is hinged between the pull rod and the two Z-shaped connecting rods, and the two hinged rods are arranged in a V shape.

[0019] In one possible implementation, the inflation test mechanism includes a ventilation tube installed on the vertical section of the U-shaped frame near one side of the fixed plate. The ventilation tube slides through the fixed plate and the pressure seal installed thereon. The movable plate and the pressure seal connected thereto are jointly provided with air flow holes. A connecting tube connected to the air flow hole is installed between the vertical section of the U-shaped frame and the movable plate, and both vertical sections of the U-shaped frame are provided with air flow channels.

[0020] The above one or more technical solutions in the embodiments of the present invention have at least one of the following beneficial effects: 1. The present invention realizes reverse pressure sealing on both ends of the valve by cooperating with the pressure sealing mechanism, the sealing locking mechanism and the guiding mechanism, so that both ends of the valve can obtain the effect of two-way pressure sealing, which greatly improves the sealing performance and detection accuracy of both ends of the valve during detection, and when the valve is placed, the valve axis is horizontally positioned and supported by the supporting mechanism, which not only improves the accuracy of sealing at both ends of the valve, but also avoids the problem of damaging the valve when sealing.

[0021] 2. In the present invention, before the lifting drive mechanism drives the valve to be immersed in water, the pressing sealing mechanism and the sealing locking mechanism further apply reverse pressing force to both ends of the valve under the action of the adaptive driving force of the guide mechanism, without the need for external driving force, which greatly improves the smoothness and efficiency of the two-way pressure application and immersion operation process at both ends of the valve, and also ensures the sealing of both ends of the valve.

[0022] 3. In the present invention, when the movable disk moves to seal the valve end, the outer abutment plate and the retraction guide cooperate to automatically retract under the action of adaptation, which reduces the driving source and realizes the integration of the retraction of the outer abutment plate and the movement of the movable disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the first partial three-dimensional structure of the present invention.

[0026] Figure 3 It is a schematic diagram of a second partial three-dimensional structure of the present invention.

[0027] Figure 4 It is a schematic cross-sectional view of the present invention when sealing both ends of the valve.

[0028] Figure 5 yes Figure 4 A partial enlarged view of point A.

[0029] Figure 6 yes Figure 4 A partial enlarged view of point B.

[0030] Figure 1: Test bench; 11: Test chamber; 2: Lifting drive mechanism; 3: U-shaped frame; 30: Fixed plate; 31: Hydraulic cylinder; 32: Moving plate; 33: Reverse pressure member; 331: T-shaped pressure rod; 332: Push rod; 340: Mounting seat; 341: Pull rod; 4: Support mechanism; 40: Support seat; 41: Z-shaped connecting rod; 42: Limit spring; 5: Inflatable test mechanism; 50: Ventilation pipe; 51: Air flow hole; 52: Connecting pipe ; 6. Pressure seal; 60. Sealing gasket; 7. Pressure seal mechanism; 71. Pressure rod; 72. Connecting ring; 8. Sealing locking mechanism; 80. Moving ring; 81. Moving rod; 82. Outer pressure plate; 83. Elastic connecting member; 84. Retraction guide; 840. Guide ring; 841. Guide groove; 842. Support seat; 843. Reset spring; 9. Guide mechanism; 90. Guide strip; 91. Fixed frame; 92. Guide rod; 10. Valve. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] See Figure 1 、 Figure 2 and Figure 4 A plastic valve sealing detection device includes a test bench 1, a pressure sealing mechanism 7 and a sealing locking mechanism 8. One side of the test bench 1 is an immersion test box 11. A lifting drive mechanism 2 is installed in the immersion test box 11. A U-shaped frame 3 is installed on the top of the lifting drive mechanism 2. The horizontal section of the U-shaped frame 3 is installed with a supporting mechanism 4 for horizontally supporting and axially positioning the valve 10.

[0034] See Figure 1 and Figure 2 A fixed plate 30 and a hydraulic cylinder 31 are installed on the U-shaped frame 3, and a movable plate 32 concentric with the fixed plate 30 is installed at the telescopic end of the hydraulic cylinder 31. An inflation test mechanism 5 for inflating the valve 10 is installed between the fixed plate 30 and the movable plate 32.

[0035] See Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 The fixed disk 30 is provided with a pressing seal 6 that slides along its axial direction. The movable disk 32 is also provided with a pressing seal 6 that is fixedly installed. A sealing gasket 60 is provided on the pressing seal 6.

[0036] The valve 10 is placed on the supporting mechanism 4, which supports and positions the valve 10 along its axis, so that the valve 10 is concentric with the fixed disk 30 and the movable disk 32, thereby avoiding the need to manually hold the valve 10 for alignment when sealing both ends of the valve 10. At the same time, the accuracy of the alignment and sealing between the pressing seal 6 on the fixed disk 30 and the movable disk 32 and the valve 10 is also improved, thereby preventing the valve 10 from shifting, which would cause the plastic valve 10 to be squeezed and damaged when the movable disk 32 moves to seal and fix the valve 10.

[0037] See Figure 3 、 Figure 4 and Figure 5 The vertical cross-section of the pressure seal 6 is convex with the small diameter end facing the middle of the U-shaped frame 3, and the end of the small diameter section of the pressure seal 6 is conical, so that the pressure seal 6 can be inserted into the end of the valve 10. The sealing gasket 60 is arranged at the transition position between the large diameter end and the small diameter end of the pressure seal 6.

[0038] See Figure 4 and Figure 5The pressure sealing mechanism 7 includes pressure rods 71 ​​slidably mounted on the fixed disk 30 and evenly arranged along its circumference. The pressure rods 71 ​​are connected to the corresponding pressure sealing members 6. A connecting ring 72 is commonly installed at one end of the multiple pressure rods 71 ​​away from the pressure sealing member 6. A reverse pressure member 33 is also provided on the fixed disk 30.

[0039] See Figure 4 、 Figure 5 and Figure 6 The sealing locking mechanism 8 includes a moving ring 80 and a moving rod 81 evenly arranged along its circumference installed on one side of the moving ring 80. The moving rod 81 slides away from the end of the moving ring 80 and passes through the moving disk 32, and then is slidably installed with an outer push plate 82 through an elastic connecting member 83. The horizontal section of the U-shaped frame 3 is installed with a retraction guide 84 that adaptively drives the outer push plate 82 to move toward the axis of the valve 10. An elastic limiter (such as a spring, used to prevent the moving ring 80 from moving at will, causing the outer push plate 82 to be difficult to press against the end of the valve 10) is installed between the moving ring 80 and the moving disk 32. The elastic connecting member 83 (such as a spring) is used to drive the outer push plate 82 to reset when the outer push plate 82 is disengaged from the retraction guide 84.

[0040] The hydraulic cylinder 31 drives the movable disk 32 to move toward the valve 10 and cooperates with the fixed disk 30 to press and seal the two ends of the valve 10 through the two pressing seals 6. During the movement of the movable disk 32, when the outer pressing plate 82 contacts the retraction guide 84, the outer pressing plate 82 automatically moves toward the axial direction of the valve 10 under the resistance of the retraction guide 84 to retract, so that the end of the outer pressing plate 82 close to the axis of the valve 10 is located within the outer diameter of the end of the valve 10, so that the outer pressing plate 82 can press the end of the valve 10 later.

[0041] See Figure 4 and Figure 5 The reverse pressure member 33 includes a plurality of T-shaped pressure rods 331, which are evenly arranged along the circumference of the fixed disk 30 and slide through the fixed disk 30. The pressure seal 6 is located between the plurality of T-shaped pressure rods 331 arranged circumferentially. The end surface of the fixed disk 30 close to the vertical section of the U-shaped frame 3 is provided with a plurality of circumferentially evenly arranged push rods 332. The middle part of the push rod 332 is hinged to the fixed disk 30. The T-shaped pressure rod 331 is used to push one end of the push rod 332 to rotate the push rod 332, and the other end of the push rod 332 is used to push the connecting ring 72 to move linearly.

[0042] After the valve 10 is placed on the supporting mechanism 4, the supporting mechanism 4 drives the valve 10 to contact the pressure seal 6 on the fixed disk 30. In the process of the movable disk 32 pushing the valve 10 and the pressure seal 6 on the fixed disk 30 to press tightly, the valve 10 also pushes the T-shaped pressure rod 331. The T-shaped pressure rod 331 pushes the end of the push rod 332 close to it, causing the push rod 332 to rotate. The other end of the push rod 332 presses the connecting ring 72. The connecting ring 72 pushes the pressure seal 6 on the fixed disk 30 toward the valve 10 through the pressure rod 71 and presses tightly against the valve 10, so that the end of the valve 10 close to the fixed disk 30 and the corresponding pressure seal 6 are subjected to preliminary two-way pressure sealing, which greatly improves the sealing performance of the end of the valve 10.

[0043] See Figure 1 、 Figure 2 and Figure 5 A guide mechanism 9 is installed on the immersion test box 11. The guide mechanism 9 is used to guide and drive the connecting ring 72 to move toward the fixed disk 30 when the U-shaped frame 3 moves downward, and guide and drive the movable ring 80 to move away from the movable disk 32, thereby applying a bidirectional sealing pressure to both ends of the valve 10.

[0044] When the lifting drive mechanism 2 drives the valve 10 to move into the water of the immersion test box 11, the guide mechanism 9 cooperates with the connecting ring 72 and the movable ring 80 to guide and drive the connecting ring 72 to move toward the fixed disk 30. The connecting ring 72 pushes the pressing seal 6 to move toward the end of the valve 10 through the pressing rod 71. The valve 10 applies pressure to the pressing seal 6 on the fixed disk 30 under the action of the pressing force of the movable disk 32. The pressing rod 71 pushes the pressing seal 6 to apply a reverse pressing force to the valve 10, so that the end of the valve 10 close to the fixed disk 30 and the corresponding pressing seal 6 are subjected to a bidirectional pressing pressure seal, which greatly improves the sealing performance of the end of the valve 10.

[0045] The guide mechanism 9 also guides and drives the movable ring 80 to move away from the movable disk 32. The movable ring 80 pulls the outer abutment plate 82 to move together via the movable rod 81. The outer abutment plate 82 presses the end of the valve 10 against the abutment seal 6 connected to the movable disk 32, thereby causing the end of the valve 10 closest to the movable disk 32 to be sealed with the corresponding abutment seal 6 by a bidirectional abutment pressure, thereby achieving a bidirectional sealing pressure at both ends of the valve 10. It should be noted that although the outer abutment plate 82 moves slightly toward the movable disk 32, it still abuts the end of the valve 10 under the elastic force of the elastic connector 83.

[0046] See Figure 2 、 Figure 4 and Figure 6The retraction guide 84 includes a guide ring 840, the inner surface of which is tapered, its diameter gradually increasing toward the movable disk 32. A guide groove 841 is defined in the horizontal section of the U-shaped frame 3. The lower end of the guide groove 841 is provided with a drainage channel extending through the U-shaped frame 3. A support seat 842, fixedly connected to the guide ring 840, is slidably connected to the guide groove 841. The support seat 842 is connected to the inner wall of the guide groove 841 via a return spring 843. A ball bearing is rotatably mounted on the end of the outer support plate 82, distal from the axis of the movable disk 32. When the ball bearing contacts the guide ring 840, it rolls along the inner wall of the guide ring 840. When placing the valve 10, the guide ring 840 is first pushed toward the movable disk 32, compressing the return spring 843 to facilitate placement of the valve 10 on the support mechanism 4. Once the valve 10 is placed, the guide ring 840 returns to its original position under the rebound force of the return spring 843, pressing against the end of the guide groove 841.

[0047] When the movable disk 32 moves toward the valve 10, when the ball on the outer resistance plate 82 contacts the inner ring surface of the guide ring 840, the ball moves along the inner ring surface of the guide ring 840 and gradually pushes the outer resistance plate 82 to move toward the axial direction of the valve 10 until the pressure seal 6 on the movable disk 32 is tightly pressed against the end of the valve 10. At this time, the end of the outer resistance plate 82 close to the axis of the valve 10 is located inside the end of the valve 10, so that the guide mechanism 9 can guide and drive the movable ring 80 to drive the outer resistance plate 82 to lock and seal the valve 10. The outer resistance plate 82 cooperates with the guide ring 840 to automatically retract under the action of adaptation, which reduces the driving source and realizes the integration of the retraction of the outer resistance plate 82 and the movement of the movable disk 32, thereby improving the smoothness and efficiency of the valve 10 sealing and the retraction of the outer resistance plate 82.

[0048] See Figure 1 、 Figure 2 、 Figure 3 and Figure 5 The guide mechanism 9 includes four guide bars 90 arranged in a rectangular shape. The side walls of the connecting ring 72 and the movable ring 80 are both equipped with fixed frames 91 arranged symmetrically along the width direction of the U-shaped frame 3. A guide rod 92 is installed on the fixed frame 91. The guide bars 90 correspond to the guide rods 92 one by one, and the guide bars 90 and the guide rods 92 on the same side are alternately distributed. The upper end of the guide bar 90 is close to the side of the corresponding guide rod 92 and is provided with an inclined surface inclined to the guide rod 92.

[0049] During the downward movement of the U-shaped frame 3, the connecting ring 72 and the movable ring 80 contact the corresponding guide bar 90 through the guide rod 92 connected to the fixed frame 91. A ball is installed at the end of the guide rod 92. The ball on the guide rod 92 moves along the inclined surface of the guide bar 90. The inclined surface of the guide bar 90 squeezes and pushes the corresponding connecting ring 72 or the movable ring 80 to move in a straight line, thereby realizing bidirectional pressure sealing at both ends of the valve 10. The guide bar 90 and the guide rod 92 cooperate to drive the connecting ring 72 and the movable ring 80 without external drive and external operation, which greatly improves the smoothness and efficiency of the bidirectional pressure and water immersion operation process at both ends of the valve 10.

[0050] See Figure 3 and Figure 5 The fixing frame 91 is Y-shaped, and both ends of the Y-shaped opening of the fixing frame 91 are connected to the corresponding connecting ring 72 or the movable ring 80. The guide rod 92 is connected to the side wall of the other end of the fixing frame 91. The Y-shaped fixing frame 91 is distributed on the side wall of the connecting ring 72 or the movable ring 80 to improve the uniformity of the force when the fixing frame 91 drives the connecting ring 72 or the movable ring 80 to move.

[0051] See Figure 2 、 Figure 3 and Figure 4 The supporting mechanism 4 includes two supporting seats 40, and the opposite surfaces of the two supporting seats 40 are installed with Z-shaped connecting rods 41. The horizontal section of the U-shaped frame 3 is installed with a fixed box. The end of the Z-shaped connecting rod 41 away from the corresponding supporting seat 40 slides through the fixed box, and a limiting spring 42 is installed between the Z-shaped connecting rod 41 and the inner wall of the fixed box.

[0052] See Figure 2 、 Figure 3 and Figure 4 The horizontal section of the U-shaped frame 3 is equipped with a mounting seat 340, and a pull rod 341 is slidably connected to the mounting seat 340. A hinged rod is hinged between the pull rod 341 and the two Z-shaped connecting rods 41, and the two hinged rods are arranged in a V shape.

[0053] Manually pull the pull rod 341 to drive the two Z-shaped connecting rods 41 and the two supporting seats 40 to move toward the middle of the fixed box through the hinged rod and squeeze the limit spring 42, so that the valve 10 can be placed on the two supporting seats 40; after the valve 10 is placed on the supporting seat 40, release the pull rod 341, and the Z-shaped connecting rod 41 drives the supporting seat 40 to move toward the end of the valve 10 under the elastic force of the limit spring 42 until the supporting seat 40 conflicts with the side wall of the end of the valve 10, thereby realizing the center positioning and support of the valve 10, and at the same time preliminarily limiting the freedom of movement of the valve 10 along its own axis.

[0054] See Figure 2 and Figure 4The inflation test mechanism 5 includes a vent pipe 50 installed on the vertical section of the U-shaped frame 3 near one side of the fixed plate 30. The vent pipe 50 slides through the fixed plate 30 and the pressure seal 6 installed thereon. The movable plate 32 and the pressure seal 6 connected thereto are both provided with an air flow hole 51. A connecting pipe 52 connected to the air flow hole 51 is installed between the vertical section of the U-shaped frame 3 and the movable plate 32. Both vertical sections of the U-shaped frame 3 are provided with air flow channels, and the two air flow channels are respectively connected to the exhaust valve and the air pump through flexible tubes (not shown in the figure).

[0055] After the valve 10 is immersed in water, air is inflated into the valve 10 through the air pump, the air flow channel, the connecting pipe 52 and the air flow hole 51 to perform a sealing test on the valve 10 .

[0056] See Figures 1-6 Working principle: First, the valve 10 is placed on the supporting mechanism 4, and the valve 10 is supported and positioned on the axis by the supporting mechanism 4, so that the valve 10 is concentric with the fixed disk 30 and the movable disk 32, thereby improving the accuracy of the pressure seal 6 on the fixed disk 30 and the movable disk 32 and the valve 10.

[0057] Next, the hydraulic cylinder 31 drives the movable disk 32 to move toward the valve 10 and cooperates with the fixed disk 30 to press and seal the two ends of the valve 10 through the two pressing seals 6. During the movement of the movable disk 32, when the outer pressing plate 82 contacts the retraction guide 84, the outer pressing plate 82 automatically moves toward the axial direction of the valve 10 and retracts under the resistance of the retraction guide 84, so that the outer pressing plate 82 can press the end of the valve 10 until the movable disk 32 presses and seals the valve 10 on the fixed disk 30.

[0058] Afterwards, when the lifting drive mechanism 2 drives the valve 10 to move into the water of the immersion test box 11, the guiding mechanism 9 cooperates with the connecting ring 72 and the moving ring 80 to guide and drive the connecting ring 72 to move toward the fixed disk 30. The connecting ring 72 pushes the pressing seal 6 to move toward the end of the valve 10 through the pressing rod 71. The valve 10 applies pressure to the pressing seal 6 on the fixed disk 30 under the pressing force of the moving disk 32. The pressing rod 71 pushes the pressing seal 6 to apply a reverse pressing force to the valve 10, so that the end of the valve 10 close to the fixed disk 30 and the corresponding pressing seal 6 are subjected to a bidirectional pressing pressure seal; the moving ring 80 pulls the outer pressing plate 82 through the moving rod 81 to press the end of the valve 10 against the pressing seal 6 connected to the moving disk 32, and then the end of the valve 10 close to the moving disk 32 and the corresponding pressing seal 6 are subjected to a bidirectional pressing pressure seal, and both ends of the valve 10 are subjected to a bidirectional sealing pressing pressure.

[0059] After the valve 10 is immersed in water, the air is inflated into the valve 10 through the air pump, connecting pipe 52, and air flow hole 51 in both the closed and open states to perform a sealing test. Specifically: Closed: When the valve core of the valve 10 is in close contact with the valve seat, the valve 10 is in the closed state. In this state, the air pump inflates the valve 10 to a certain value and then stops inflating. The air is sealed inside the valve 10. After a certain period of time, the water is observed for bubbles to detect whether the valve 10 is leaking and determine whether the valve 10 is qualified. If there are bubbles in the water, it means that the valve 10 is leaking and unqualified.

[0060] Open: By operating the rotating handwheel or pulling the handle on the valve 10, the valve core is removed from the valve seat to open the internal channel of the valve 10, and then the valve 10 is inflated. The gas can escape through the internal channel of the valve 10. After the air pump inflates the valve 10 to a certain value, stop inflating and observe whether there are bubbles in the water to determine whether the connection of the valve 10 itself is qualified. If there are bubbles in the water, it means that there is a leak in the connection of the valve 10 itself (such as the valve body, valve cover, etc.).

[0061] Both ends of the valve 10 are subjected to bidirectional sealing pressure and are in a stable and efficient sealing state. By testing the sealing performance of the valve 10's own connection and the sealing performance of the valve core and valve seat of the valve 10, the sealing performance and quality of the valve 10 are comprehensively evaluated.

[0062] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0063] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "connected," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0064] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A plastic valve sealing test device, comprising a test bench, one side of which is a water immersion test box, and a lifting drive mechanism installed in the water immersion test box, characterized in that: include: A U-shaped frame is installed on the top of the lifting drive mechanism, and a supporting mechanism for horizontally supporting the valve and positioning the axis is installed on the U-shaped frame; A fixed plate and a hydraulic cylinder are installed on the U-shaped frame, a movable plate concentric with the fixed plate is installed at the telescopic end of the hydraulic cylinder, and an inflation test mechanism for inflating the valve is installed between the fixed plate and the movable plate; The fixed disk is provided with a pressure seal member which slides along its axial direction, and the movable disk is also provided with a pressure seal member which is fixedly provided with a sealing gasket. The pressure sealing mechanism includes pressure rods slidably mounted on the fixed plate and evenly arranged along its circumference, the pressure rods being connected to corresponding pressure sealing members, and a connecting ring being commonly mounted on one end of the plurality of pressure rods away from the pressure sealing members; The sealing locking mechanism includes a moving ring and moving rods evenly arranged along its circumference installed on one side of the moving ring. One end of the moving rod slides through the moving disk and is slidably mounted with an outer abutment plate via an elastic connector. The horizontal section of the U-shaped frame is mounted with a retraction guide that adaptively drives the outer abutment plate to move toward the valve axis. A guide mechanism is installed on the immersion test box, and the guide mechanism is used to guide and drive the connecting ring and the moving ring to apply bidirectional sealing pressure to both ends of the valve.

2. A plastic valve sealing detection device according to claim 1, characterized in that: The retraction guide includes a guide ring, the inner ring surface of the guide ring is conical with a diameter gradually increasing toward the movable disk, the horizontal section of the U-shaped frame is provided with a guide groove, a support seat fixedly connected to the guide ring is slidably connected to the guide groove, and the support seat is connected to the inner wall of the guide groove by a reset spring.

3. The plastic valve sealing detection device according to claim 1, characterized in that: It also includes a reverse pressure piece, which includes a plurality of T-shaped pressure rods, which are evenly arranged along the circumference of the fixed disk and slide through the fixed disk. The pressure seal is located between the plurality of T-shaped pressure rods arranged circumferentially. The end surface of the fixed disk close to the vertical section of the U-shaped frame is provided with a plurality of circumferentially evenly arranged push rods. The middle part of the push rod is hinged to the fixed disk. The T-shaped pressure rod is used to push one end of the push rod to rotate the push rod, and the other end of the push rod is used to push the connecting ring to move linearly.

4. The plastic valve sealing detection device according to claim 1, characterized in that: The supporting mechanism includes two supporting seats, and Z-shaped connecting rods are installed on the opposite surfaces of the two supporting seats. A fixing box is installed on the horizontal section of the U-shaped frame. The end of the Z-shaped connecting rod away from the corresponding supporting seat slides through the fixing box, and a limiting spring is installed between the Z-shaped connecting rod and the inner wall of the fixing box.

5. The plastic valve sealing detection device according to claim 1, characterized in that: The inflation test mechanism includes a vent pipe installed on the vertical section of the U-shaped frame close to one side of the fixed plate. The vent pipe slides through the fixed plate and the pressure seal installed thereon. The movable plate and the pressure seal connected thereto are both provided with air flow holes. A connecting pipe connected to the air flow hole is installed between the vertical section of the U-shaped frame and the movable plate.

6. The plastic valve sealing detection device according to claim 1, characterized in that: The guiding mechanism includes four guide bars arranged in a rectangular shape. The side walls of the connecting ring and the movable ring are both equipped with fixed frames arranged symmetrically along the width direction of the U-shaped frame. Guide rods are installed on the fixed frames. The guide bars correspond to the guide rods one by one, and the guide bars and guide rods on the same side are distributed alternately. The upper end of the guide bar is close to the side of the corresponding guide rod and is provided with an inclined surface inclined toward the guide rod.

7. A plastic valve sealing detection device according to claim 4, characterized in that: The horizontal section of the U-shaped frame is provided with a mounting seat, a pull rod is slidably connected to the mounting seat, and a hinged rod is hinged between the pull rod and the two Z-shaped connecting rods, and the two hinged rods are arranged in a V shape.

8. The plastic valve sealing detection device according to claim 1, characterized in that: The vertical cross section of the pressure seal is convex with the small diameter end facing the middle of the U-shaped frame, and the end of the small diameter section of the pressure seal is conical. The sealing gasket is set at the transition position between the large diameter end and the small diameter end of the pressure seal.

9. The plastic valve sealing detection device according to claim 6, characterized in that: The fixing frame is Y-shaped, and both ends of the Y-shaped opening of the fixing frame are connected to corresponding connecting rings or movable rings, and the guide rod is connected to the side wall of the other end of the fixing frame.

10. The plastic valve sealing detection device according to claim 2, characterized in that: The lower end of the guide groove is provided with a drainage channel which passes through the U-shaped frame.

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