Plastic valve sealing performance detection device

Abstract

The invention relates to the technical field of valve detection, and particularly provides a plastic valve sealing performance detection device which comprises a test bed, a bearing mechanism, an inflation test mechanism, an abutting sealing mechanism, a sealing locking mechanism and a guide mechanism. According to the invention, through the cooperation of the pressing sealing mechanism, the sealing locking mechanism and the guiding mechanism, the two ends of the valve are pressed and sealed reversely, so that the two ends of the valve are pressed and sealed bidirectionally, the sealing performance of the two ends of the valve and the detection accuracy during detection are greatly improved, and when the valve is placed, the sealing performance of the valve is greatly improved. And the bearing mechanism is used for horizontally positioning and bearing the axis of the valve, so that the sealing accuracy of the two ends of the valve is improved, and the problem that the valve is damaged when the valve is sealed is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of valve detection, and specifically provides a sealing performance detection device for plastic valves. Background Art

[0002] The detection of the sealing performance of plastic valves is a key step to ensure that there is no leakage during their use. Currently, when detecting the sealing performance of plastic valves, the two ends of the valve are often directly sealed by a sealing and inflating device, and then the valve is immersed in water and inflated into the valve, and whether there are bubbles in the water is observed to determine 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 manually holding the valve continuously for alignment and placement. In this way, the valve may be offset due to human factors such as unstable manual support, resulting in the plastic valve being easily squeezed and damaged when the sealing and fixing mechanism presses and seals the valve, and the sealing performance detection operation of the valve cannot be carried out anymore; 2. Only guiding pressing forces are applied to both ends of the valve. Once the sealing pressing force is insufficient, it will directly lead to inaccurate valve detection. Therefore, the sealing effect of the sealing and inflating device on both ends of the valve needs to be improved. Summary of the Invention

[0004] In view of the above problems, the embodiments of the present invention provide a sealing performance detection device for plastic valves to solve the technical problems in the related art.

[0005] To achieve the above object, the embodiments of the present invention provide the following technical solutions: A sealing performance detection device for plastic valves includes a test bench. One side of the test bench is an immersion test tank, and a lifting drive mechanism is installed in the immersion test tank. A U-shaped frame is installed on the top of the lifting drive mechanism, and a supporting mechanism for horizontally supporting and axially positioning the valve is installed on the horizontal section of the U-shaped frame.

[0006] A fixed disk and a hydraulic cylinder are installed on the U-shaped frame. A moving disk concentric with the fixed disk is installed at the telescopic end of the hydraulic cylinder, and an inflating test mechanism for inflating the valve is installed between the fixed disk and the moving disk.

[0007] A pressing and sealing member that slides axially along the fixed disk is installed on the fixed disk, and a pressing and sealing member is also fixedly installed on the moving disk. A sealing gasket is installed on the pressing and sealing member.

[0008] In a possible implementation manner, the vertical cross-section of the pressing and sealing member 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 pressing and sealing member is conical, so as to facilitate the pressing and sealing member to be inserted into the end of the valve, and the sealing gasket is sleeved at the transition position between the large-diameter end and the small-diameter end of the pressing and sealing member.

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

[0010] The sealing and locking mechanism includes a moving ring and moving rods that are installed on one side of the moving ring and are evenly arranged along its circumference. One end of the moving rod slidably penetrates through the moving disk and is slidably installed with an outer pressing plate through an elastic connecting member. A closing and guiding member for adaptively driving the outer pressing plate to move towards the axis of the valve is installed on the horizontal section of the U-shaped frame. An elastic limiting member (such as a spring) is installed between the moving ring and the moving disk. The elastic connecting member (such as a spring) is used to drive the outer pressing plate to reset when the outer pressing plate disengages from the closing and guiding member.

[0011] In a possible implementation manner, the fixed disk is further installed with a reverse pressing member. The reverse pressing member includes a plurality of T-shaped pressing rods. The plurality of T-shaped pressing rods are evenly arranged along the circumference of the fixed disk and slidably penetrate through the fixed disk. The pressing and sealing member is located between the circumferentially arranged plurality of T-shaped pressing rods. The end face of the fixed disk close to the vertical section of the U-shaped frame is provided with a plurality of pressing rods that are evenly arranged in the circumferential direction. The middle of the pressing rod is hinged to the fixed disk. The T-shaped pressing rod is used to push one end of the pressing rod to make the pressing rod rotate. The other end of the pressing rod is used to push the connecting ring to move linearly.

[0012] A guiding mechanism is installed on the immersion test chamber. The guiding mechanism is used to guide and drive the connecting ring to move towards the fixed disk and guide and drive the moving ring to move away from the moving disk when the U-shaped frame moves downward, and apply a two-way sealing pressing force to both ends of the valve.

[0013] In a possible implementation manner, the closing and guiding member includes a guiding ring. The inner ring surface of the guiding ring is a cone with a diameter gradually increasing towards the moving disk. A guiding groove is opened on the horizontal section of the U-shaped frame. A support seat fixedly connected to the guiding ring is slidably connected to the guiding groove. A return spring is connected between the support seat and the inner wall of the guiding groove. A ball is rotatably installed at one end of the outer pressing plate away from the axis of the moving disk.

[0014] In a possible implementation manner, the guiding mechanism includes four guiding strips arranged in a rectangle. Fixed frames symmetrically arranged along the width direction of the U-shaped frame are installed on the side walls of the connecting ring and the moving ring. A guiding rod is installed on the fixed frame. The guiding strips and the guiding rods are in one-to-one correspondence, and the guiding strips and the guiding rods on the same side are alternately distributed. An inclined surface inclined towards the guiding rod is provided on one side of the upper end of the guiding strip close to the corresponding guiding rod.

[0015] In a possible implementation manner, the fixed frame is in a Y shape. The two ends at the opening of the Y shape of the fixed frame are connected to the corresponding connecting ring or moving ring, and the guiding rod is connected to the side wall at the other end of the fixed frame.

[0016] In a possible implementation manner, 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. One end of the Z-shaped connecting rod away from the corresponding supporting seat slides 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 a possible implementation manner, a drainage channel penetrating the U-shaped frame is provided at the lower end of the guiding groove.

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

[0019] In a possible implementation manner, the inflation test mechanism includes an air pipe installed on the vertical section of the U-shaped frame close to one side of the fixed disk. The air pipe slidably penetrates the fixed disk and the pressure-resistant seal installed thereon. Air flow holes are jointly formed on the moving disk and the pressure-resistant seal connected thereto. A connecting pipe communicating with the air flow holes is installed between the vertical section of the U-shaped frame and the moving disk. Air flow channels are formed in both vertical sections of the U-shaped frame.

[0020] One or more of the above technical solutions in the embodiments of the present invention have at least one of the following beneficial effects: 1. By cooperating the pressure-resistant sealing mechanism, the sealing and locking mechanism and the guiding mechanism, the present invention realizes reverse pressure-resistant sealing at both ends of the valve, so that both ends of the valve obtain the effect of double-sided pressure-resistant sealing, greatly improving the sealing performance at both ends of the valve during detection and the accuracy of detection. And when the valve is placed, the supporting mechanism horizontally positions and supports the axis of the valve, not only improving the accuracy of sealing both ends of the valve, but also avoiding the problem of damaging the valve when sealing the valve.

[0021] 2. Before the lifting drive mechanism drives the valve to immerse in water, the pressure-resistant sealing mechanism and the sealing and locking mechanism further apply reverse pressure to both ends of the valve under the action of the adaptive driving force of the guiding mechanism, without external driving force, greatly improving the smoothness and efficiency of the double-sided pressure application and immersion operation process at both ends of the valve, and also ensuring the sealing performance at both ends of the valve.

[0022] 3. When the moving disk moves to seal the end of the valve, the outer pressing plate and the closing guiding member cooperate to automatically close under the action of self-adaptation, reducing the driving source and realizing the function of integrating the closing of the outer pressing plate and the movement of the moving disk. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

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

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

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

[0027] Figure 4 is the cross-sectional structure schematic diagram when the two ends of the valve of the present invention are sealed.

[0028] Figure 5 is Figure 4 the partial enlarged view at position A of

[0029] Figure 6 is Figure 4 the partial enlarged view at position B of

[0030] Reference numerals: 1, test bench; 11, test chamber; 2, lifting drive mechanism; 3, U-shaped frame; 30, fixed disk; 31, hydraulic cylinder; 32, moving disk; 33, reverse pressing member; 331, T-shaped pressing rod; 332, pushing rod; 340, mounting seat; 341, pull rod; 4, supporting mechanism; 40, supporting seat; 41, Z-shaped connecting rod; 42, limiting spring; 5, inflation test mechanism; 50, ventilation pipe; 51, air flow hole; 52, connecting pipe; 6, pressing and sealing member; 60, sealing washer; 7, pressing and sealing mechanism; 71, pressing rod; 72, connecting ring; 8, sealing and locking mechanism; 80, moving ring; 81, moving rod; 82, outer pressing plate; 83, elastic connecting member; 84, folding guiding member; 840, guiding ring; 841, guiding groove; 842, supporting seat; 843, reset spring; 9, guiding mechanism; 90, guiding strip; 91, fixed frame; 92, guiding rod; 10, valve. Detailed implementation manners

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

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

[0033] Refer to Figure 1 and Figure 2 and Figure 4 , a plastic valve sealing performance detection device, including a test bench 1, a pressing and sealing mechanism 7 and a sealing and locking mechanism 8. One side of the test bench 1 is an immersion test chamber 11, and a lifting drive mechanism 2 is installed in the immersion test chamber 11. A U-shaped frame 3 is installed at the top of the lifting drive mechanism 2, and a supporting mechanism 4 for horizontally supporting and axially positioning the valve 10 is installed on the horizontal section of the U-shaped frame 3.

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

[0035] Refer to Figure 2 and Figure 3 and Figure 4 and Figure 5 and Figure 6 , a pressing and sealing member 6 sliding axially along it is installed on the fixed disk 30, and a pressing and sealing member 6 is also fixedly installed on the moving disk 32. A sealing washer 60 is installed on the pressing and sealing member 6.

[0036] The valve 10 is placed on the supporting mechanism 4. The supporting mechanism 4 supports and axially positions the valve 10, making the valve 10 concentric with the fixed disk 30 and the moving disk 32. This avoids the need to manually hold the valve 10 for alignment and placement all the time when sealing both ends of the valve 10. At the same time, it also improves the accuracy of the pressing and sealing members 6 on the fixed disk 30 and the moving disk 32 for pressing and sealing against the valve 10, preventing the valve 10 from shifting, and preventing the plastic valve 10 from being damaged by extrusion when the moving disk 32 moves to seal and fix the valve 10.

[0037] Refer to Figure 3 and Figure 4 and Figure 5 , the vertical cross-section of the pressing and sealing member 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 pressing and sealing member 6 is conical, so as to facilitate the insertion of the pressing and sealing member 6 into the end of the valve 10. The sealing washer 60 is sleeved at the transition position between the large-diameter end and the small-diameter end of the pressing and sealing member 6.

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

[0039] Refer to Figure 4 , Figure 5 and Figure 6 , the sealing and locking mechanism 8 includes a moving ring 80 and moving rods 81 that are installed on one side of the moving ring 80 and are evenly arranged along its circumference. One end of the moving rod 81 away from the moving ring 80 slidably penetrates through the moving disk 32 and is slidably installed with an outer pressing plate 82 through an elastic connecting member 83. A closing guiding member 84 for adaptively driving the outer pressing plate 82 to move towards the axis of the valve 10 is installed on the horizontal section of the U-shaped frame 3. An elastic limiting member (such as a spring, used to prevent the moving ring 80 from moving randomly, resulting in difficulty for the outer pressing plate 82 to press 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 pressing plate 82 to reset when the outer pressing plate 82 is separated from the closing guiding member 84.

[0040] The hydraulic cylinder 31 drives the moving disk 32 to move towards the valve 10 and cooperates with the fixed disk 30 to tightly seal both ends of the valve 10 through two pressing and sealing members 6. During the movement of the moving disk 32, when the outer pressing plate 82 comes into contact with the closing guiding member 84, the outer pressing plate 82 automatically moves towards the axis direction of the valve 10 for closing under the resistance of the closing guiding member 84, so that one end of the outer pressing plate 82 close to the axis of the valve 10 is located inside the outer diameter of the end of the valve 10, facilitating the subsequent pressing of the end of the valve 10 by the outer pressing plate 82.

[0041] Refer to Figure 4 and Figure 5 , the reverse pressing member 33 includes multiple T-shaped pressing rods 331. The multiple T-shaped pressing rods 331 are evenly arranged along the circumference of the fixed disk 30 and slidably penetrate through the fixed disk 30. The pressing and sealing member 6 is located between the circumferentially arranged multiple T-shaped pressing rods 331. A plurality of pushing rods 332 that are evenly arranged circumferentially are provided on the end face of the fixed disk 30 close to the vertical section of the U-shaped frame 3. The middle of the pushing rod 332 is hinged to the fixed disk 30. The T-shaped pressing rod 331 is used to push one end of the pushing rod 332 to make the pushing rod 332 rotate, and the other end of the pushing 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-resistant seal 6 on the fixed disk 30. During the process of the moving disk 32 pushing the valve 10 to press tightly against the pressure-resistant seal 6 on the fixed disk 30, the valve 10 also pushes the T-shaped pressure rod 331. The T-shaped pressure rod 331 pushes the pressure rod 332 at its closer end, causing the pressure rod 332 to rotate. The other end of the rotating pressure rod 332 presses against the connecting ring 72. The connecting ring 72 pushes the pressure-resistant seal 6 on the fixed disk 30 to move towards the valve 10 through the pressure rod 71 and press tightly against the valve 10, so that the end of the valve 10 close to the fixed disk 30 and the corresponding pressure-resistant seal 6 are subjected to a preliminary two-way pressure-resistant seal, greatly improving the sealing performance of the end of the valve 10.

[0043] Refer to Figure 1 、 Figure 2 and Figure 5 , a guiding mechanism 9 is installed on the immersion test chamber 11. The guiding mechanism 9 is used to guide and drive the connecting ring 72 to move towards the fixed disk 30 and guide and drive the moving ring 80 to move away from the moving disk 32 when the U-shaped frame 3 moves downward, applying a two-way 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 chamber 11, the guiding mechanism 9 cooperates with the connecting ring 72 and the moving ring 80, guides and drives the connecting ring 72 to move towards the fixed disk 30. The connecting ring 72 pushes the pressure-resistant seal 6 towards the end of the valve 10 through the pressure rod 71. And the valve 10 applies pressure to the pressure-resistant seal 6 on the fixed disk 30 under the pressing force of the moving disk 32. The pressure rod 71 pushes the pressure-resistant seal 6 to apply a reverse pressure thrust to the valve 10, so that the end of the valve 10 close to the fixed disk 30 and the corresponding pressure-resistant seal 6 are subjected to a two-way pressure-resistant seal, greatly improving the sealing performance of the end of the valve 10.

[0045] The guiding mechanism 9 also guides and drives the moving ring 80 to move away from the moving disk 32. The moving ring 80 pulls the outer pressing plate 82 to move together through the moving rod 81. The outer pressing plate 82 presses the end of the valve 10 against the pressure-resistant seal 6 connected to the moving disk 32, so that the end of the valve 10 close to the moving disk 32 and the corresponding pressure-resistant seal 6 are subjected to a two-way pressure-resistant seal. Furthermore, both ends of the valve 10 are subjected to a two-way sealing pressure. It should be noted that although the outer pressing plate 82 will move slightly towards the moving disk 32, the outer pressing plate 82 will still press against the end of the valve 10 under the elastic force of the elastic connecting piece 83.

[0046] Refer to Figure 2 、 Figure 4 and Figure 6, the folding guide member 84 includes a guide ring 840. The inner ring surface of the guide ring 840 is conical with a diameter gradually increasing towards the moving disk 32. A guide groove 841 is formed in the horizontal section of the U-shaped frame 3. A drainage channel penetrating the U-shaped frame 3 is provided at the lower end of the guide groove 841. 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 by a return spring 843. A ball is rotatably installed at one end of the outer pressing plate 82 away from the axis of the moving disk 32. When the ball contacts the inner wall of the guide ring 840, it rolls along the inner wall of the guide ring 840; when placing the valve 10, first push the guide ring 840 towards the moving disk 32 to compress the return spring 843, so as to facilitate placing the valve 10 on the supporting mechanism 4. After the valve 10 is placed, the guide ring 840 will reset under the resilience of the return spring 843 and abut against the end of the guide groove 841.

[0047] During the process of the moving disk 32 moving towards the valve 10, when the ball on the outer pressing 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 pressing plate 82 towards the axis direction of the valve 10 until the pressing and sealing member 6 on the moving disk 32 abuts tightly against the end of the valve 10. At this time, one end of the outer pressing plate 82 close to the axis of the valve 10 is located inside the end of the valve 10, so as to facilitate the guiding mechanism 9 to guide and drive the moving ring 80 to drive the outer pressing plate 82 to lock and seal the valve 10 later. The outer pressing plate 82 and the guide ring 840 cooperate to automatically fold in an adaptive manner, reducing the drive source and realizing the function of integrating the folding of the outer pressing plate 82 and the movement of the moving disk 32, thereby improving the smoothness and efficiency of the sealing of the valve 10 and the folding of the outer pressing plate 82.

[0048] Refer to Figure 1 、 Figure 2 、 Figure 3 And Figure 5 , the guiding mechanism 9 includes four guide bars 90 arranged in a rectangular pattern. Fixed frames 91 symmetrically arranged along the width direction of the U-shaped frame 3 are installed on both the connecting ring 72 and the side wall of the moving ring 80. Guide rods 92 are installed on the fixed frames 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. An inclined surface inclined towards the corresponding guide rod 92 is provided on the upper end of the guide bar 90 close to one side of 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 linearly, thereby realizing two-way pressure sealing at both ends of the valve 10. The guide bar 90 cooperates with the guide rod 92 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 two-way pressure and water immersion operation process at both ends of the valve 10.

[0050] See also 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 moving 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 moving ring 80 to improve the uniformity of the force when the fixing frame 91 drives the connecting ring 72 or the moving ring 80 to move.

[0051] See also 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 fixing box. The end of the Z-shaped connecting rod 41 away from the corresponding supporting seat 40 slides through the fixing box, and a limiting spring 42 is installed between the Z-shaped connecting rod 41 and the inner wall of the fixing box.

[0052] See also Figure 2 , Figure 3 and Figure 4 The horizontal section of the U-shaped frame 3 is provided with a mounting seat 340, a pull rod 341 is slidably connected to the mounting seat 340, and 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 hinge 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 seats 40, release the pull rod 341, and the Z-shaped connecting rod 41 drives the supporting seats 40 to move toward the end of the valve 10 under the elastic force of the limit spring 42 until the supporting seats 40 are in conflict with the side walls 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 also Figure 2 and Figure 4, the inflation test mechanism 5 includes an air pipe 50 installed on the vertical section of the U-shaped frame 3 near one side of the fixed disk 30. The air pipe 50 slidably penetrates through the fixed disk 30 and the pressure-resistant seal 6 installed thereon. Airflow holes 51 are commonly opened on the moving disk 32 and the pressure-resistant seal 6 connected thereto. A connecting pipe 52 communicating with the airflow holes 51 is installed between the vertical section of the U-shaped frame 3 and the moving disk 32. Airflow channels are opened in both vertical sections of the U-shaped frame 3, and the two airflow channels are respectively connected to an exhaust valve and an air pump through flexible pipes (not shown in the figure).

[0055] After the valve 10 is immersed in water, the valve 10 is inflated through the air pump, the airflow channels, the connecting pipe 52, and the airflow holes 51 to detect the sealing performance of the valve 10.

[0056] Refer to Figures 1 - 6 , working principle: First, place the valve 10 on the supporting mechanism 4. The supporting mechanism 4 supports and positions the axis of the valve 10, making the valve 10 concentric with the fixed disk 30 and the moving disk 32, which improves the accuracy of the pressure-resistant seals 6 on the fixed disk 30 and the moving disk 32 to be in alignment and press against the valve 10 for sealing.

[0057] Next, the hydraulic cylinder 31 drives the moving disk 32 to move towards the valve 10 and cooperates with the fixed disk 30 to tightly seal both ends of the valve 10 through the two pressure-resistant seals 6. When the outer pressing plate 82 contacts the folding guiding member 84 during the movement of the moving disk 32, the outer pressing plate 82 automatically moves towards the axis direction of the valve 10 for folding under the resistance of the folding guiding member 84, so as to facilitate the outer pressing plate 82 to press against the end of the valve 10 until the moving disk 32 presses and seals the valve 10 on the fixed disk 30.

[0058] After that, when the lifting drive mechanism 2 drives the valve 10 to move into the water in the immersion test tank 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 towards the fixed disk 30. The connecting ring 72 pushes the pressure-resistant seal 6 towards the end of the valve 10 through the pressure rod 71. And the valve 10 applies pressure to the pressure-resistant seal 6 on the fixed disk 30 under the pressing and pushing force of the moving disk 32. The pressure rod 71 pushes the pressure-resistant 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 pressure-resistant seal 6 are sealed under the action of double-sided pressing forces; 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 pressure-resistant seal 6 connected to the moving disk 32. Furthermore, the end of the valve 10 close to the moving disk 32 and the corresponding pressure-resistant seal 6 are sealed under the action of double-sided pressing forces, and both ends of the valve 10 are subjected to the action of double-sided sealing pressing forces.

[0059] After the valve 10 is immersed in water, air is inflated into the valve 10 through an air pump, a connecting pipe 52, and an air flow hole 51 in both the closed and open states of the valve 10 for leak detection. 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, after the air pump inflates the valve 10 to a certain value, the inflation stops, and the gas is sealed inside the valve 10. After a certain period of time, check whether there are bubbles in the water to detect whether the valve 10 leaks and determine whether the valve 10 is qualified. If there are bubbles in the water, it means that the valve 10 leaks and is unqualified.

[0060] Open: By operating the rotary handwheel or lever on the valve 10, move the valve core away from the valve seat to open the internal passage of the valve 10, and then inflate the valve 10. The gas can escape through the internal passage of the valve 10. After the air pump inflates the valve 10 to a certain value, stop the inflation and check whether there are bubbles in the water to determine whether the joints of the valve 10 itself are qualified. If there are bubbles in the water, it means that there are leaks at the joints of the valve 10 itself (such as the valve body, valve cover, etc.).

[0061] When both ends of the valve 10 are under the action of bidirectional sealing pressure and are in a stable and efficient sealing state, comprehensively evaluate the sealing performance and quality of the valve 10 by detecting the sealing performance of the joints of the valve 10 itself and the sealing performance of the valve core and valve seat of the valve 10.

[0062] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 should not be construed as a limitation to the present invention.

[0063] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connected", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] The embodiments of the specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A plastic valve sealing performance detection device, comprising a test bench, one side of the test bench is an immersion test box, and a lifting drive mechanism is installed in the immersion test box, characterized in that, Comprising: A U-shaped frame is installed at the top of the lifting drive mechanism, and a supporting mechanism for horizontally supporting and axially positioning the valve is installed on the U-shaped frame; A fixed disk and a hydraulic cylinder are installed on the U-shaped frame. A moving disk concentric with the fixed disk is installed at the telescopic end of the hydraulic cylinder. An air inflation test mechanism for inflating the valve is installed between the fixed disk and the moving disk; A pressing seal is installed on the fixed disk and slides axially thereon. A pressing seal is also fixedly installed on the moving disk, and a sealing gasket is installed on the pressing seal; A pressing and sealing mechanism, which includes pressing rods slidably installed on the fixed disk and evenly arranged circumferentially along it. The pressing rods are connected to the corresponding pressing seals. A connecting ring is commonly installed at one ends of the plurality of pressing rods away from the pressing seals; A sealing and locking mechanism, which includes a moving ring and moving rods evenly arranged circumferentially on one side of the moving ring. One end of the moving rod slidably penetrates through the moving disk and is slidably installed with an outer pressing plate through an elastic connecting piece. A closing guiding member for adaptively driving the outer pressing plate to move towards the axis of the valve is installed on the horizontal section of the U-shaped frame; A guiding mechanism is installed on the immersion test box. The guiding mechanism is used to guide and drive the connecting ring and the moving ring to apply a two-way sealing pressing force to both ends of the valve.

2. The plastic valve sealing performance detection device according to claim 1, characterized in that: The closing guiding member includes a guiding ring. The inner ring surface of the guiding ring is conical with a diameter gradually increasing towards the moving disk. A guiding groove is opened on the horizontal section of the U-shaped frame. A support seat fixedly connected to the guiding ring is slidably connected to the guiding groove. A return spring is connected between the support seat and the inner wall of the guiding groove.

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

4. The plastic valve sealing performance detection device according to claim 1, wherein: 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. One end of the Z-shaped connecting rod away from the corresponding supporting seat slidably penetrates into the fixed box, and a limiting spring is installed between the Z-shaped connecting rod and the inner wall of the fixed box.

5. The plastic valve sealing performance detection device according to claim 1, wherein: The air inflation test mechanism includes an air pipe installed on the vertical section of the U-shaped frame close to the fixed disk. The air pipe slidably penetrates through the fixed disk and the pressing seal installed thereon. Air flow holes are commonly opened on the moving disk and the pressing seal connected thereto. A connecting pipe communicating with the air flow holes is installed between the vertical section of the U-shaped frame and the moving disk.

6. The plastic valve sealing performance detection device according to claim 1, characterized in that: The guiding mechanism includes four guiding strips arranged in a rectangle. Fixed frames symmetrically arranged along the width direction of the U-shaped frame are installed on the side walls of the connecting ring and the moving ring. Guiding rods are installed on the fixed frames. The guiding strips and the guiding rods correspond one by one, and the guiding strips and the guiding rods on the same side are alternately distributed. An inclined surface inclined towards the guiding rod is provided on one side of the upper end of the guiding strip close to the corresponding guiding rod.

7. The plastic valve sealing performance detection device according to claim 4, wherein: An installation seat is installed on the horizontal section of the U-shaped frame. A pull rod is slidably connected to the installation seat. Articulated rods are respectively hinged between the pull rod and the two Z-shaped connecting rods, and the two articulated rods are arranged in a V shape.

8. The plastic valve sealing performance detection device according to claim 1, wherein: The vertical cross-section of the pressing and sealing member 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 pressing and sealing member is conical. The sealing gasket is sleeved at the transition position between the large-diameter end and the small-diameter end of the pressing and sealing member.

9. The plastic valve sealing performance detection device according to claim 6, characterized in that: The fixing frame is in a Y shape. Both ends at the opening of the Y shape of the fixing frame are connected to the corresponding connecting ring or moving ring, and the guiding rod is connected to the side wall at the other end of the fixing frame.

10. The plastic valve sealing performance detection device according to claim 2, wherein: A drainage channel penetrating the U-shaped frame is provided at the lower end of the guiding groove.

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