A pressure testing machine for airtightness testing of grooved elbow pipe fittings

Abstract

The present invention provides a pressure testing machine for air tightness of grooved elbow pipe fittings, which relates to the technical field of air tightness testing of elbow pipe fittings and includes a frame, a mounting groove and a pressure rod; the mounting groove includes two bases, and rubber pads are provided on the bases; a chuck is installed at the lower part of the pressure rod, and two clamping plates are connected to the chuck through spring pins and connecting pieces; a piston cylinder is provided on the frame, a gear pump capable of driving the rubber pad to rotate is provided on the base, and hoses are connected between the outlet side of the gear pump and the liquid inlet of the piston cylinder and between the inlet side of the gear pump and the liquid outlet of the piston cylinder. The clamping plates of the present invention can clamp and center the grooved elbow pipe fitting placed on the rubber pad of the base, and the gear pump can drive the rubber pad to rotate, which is beneficial to reducing the wear of the part near the lower end of the rubber pad due to long-term contact with the end face of the grooved elbow pipe fitting, and thus is beneficial to reducing the situation that the end face of the grooved elbow pipe fitting does not fit tightly with the rubber pad.

Description

Technical Field

[0001] The present invention relates to the technical field of airtightness testing for elbow pipe fittings, and particularly to a pressure testing machine for airtightness testing of grooved elbow pipe fittings. Background Art

[0002] Grooved elbow pipe fittings are a type of pipe connection component, mainly used at the turning points of pipelines to help achieve smooth connection of the pipeline system. Its main functions include connection transition and connection sealing, ensuring the stability and safety of the pipeline system. Since grooved elbow pipe fittings are often used at joints and there is liquid or gas flowing through them, once the airtightness is poor, leakage will occur, and the consequences may be very harmful. Therefore, before leaving the factory, grooved elbow pipe fittings usually need to be subjected to airtightness testing to make their sealing performance meet the technical requirements. In the prior art, the airtightness testing of grooved elbow pipe fittings usually adopts an airtightness testing pressure machine, injecting media such as compressed air or water into the pipe fittings, and then applying a certain pressure to observe whether there is air leakage or water leakage.

[0003] For example, the patent document with the publication number CN216207319U discloses a pipe fitting airtightness detection device. When in use, the grooved elbow pipe fitting is placed in the installation groove, the hydraulic cylinder pushes the connecting piece downward to make the disc on the connecting piece press tightly against the grooved elbow pipe fitting, and the two end faces of the grooved elbow pipe fitting are closely attached to the two end faces of the installation groove. Rubber gaskets are installed on the two end faces of the installation groove. The air in the air supply pipeline enters the grooved elbow pipe fitting through the port of the installation groove by opening the air supply pipeline. The oil cylinder drives the water tank to rise, and the water surface in the water tank submerges the two end faces of the grooved elbow pipe fitting. If no bubbles appear on the grooved elbow pipe fitting, it is determined that the airtightness detection of the grooved elbow pipe fitting is qualified.

[0004] The rubber gaskets on the end faces of the installation groove of the above pipe fitting airtightness detection device will be worn to varying degrees after long-term use. Since the two rubber gaskets on the installation groove are in a V shape and under the action of the gravity of the grooved elbow pipe fitting, the part of the rubber gasket closer to the lower part is more likely to be worn, resulting in different degrees of wear between the upper and lower parts of the rubber gasket, which will affect the tightness of the end face of the grooved elbow pipe fitting and the rubber gasket, thereby affecting the accuracy of the sealing performance test results. Summary of the Invention

[0005] In view of this, the present invention provides a pressure testing machine for airtightness testing of grooved elbow pipe fittings, which solves the technical problem that the tightness between the end face of the grooved elbow pipe fitting and the rubber pad in the prior art is not good, affecting the accuracy of the airtightness test results of the grooved elbow pipe fitting.

[0006] To solve the above technical problems, the present invention provides a leak tightness testing and pressure applying machine for grooved elbow pipe fittings, which includes a frame, a mounting groove arranged on the frame, and a pressure rod; the mounting groove includes two V-shaped bases, rubber pads are arranged on the bases, and a linear driver one for driving the pressure rod to lift and lower is arranged on the frame;

[0007] A connecting frame is installed at the lower part of the pressure rod, an inverted U-shaped chuck is slidably arranged on the connecting frame, a tension spring is connected between the upper end of the chuck and the connecting frame, two clamping plates are connected inside the chuck through spring pins, and a connecting member is also connected between the clamping plates and the chuck;

[0008] A piston cylinder is arranged on the frame, a piston rod is arranged inside the piston cylinder, a return spring one is connected between the piston rod and the piston cylinder, a locking member capable of abutting against the chuck is connected to the piston rod, a gear pump capable of driving the rubber pad to rotate is arranged on the base, and hoses are connected between the outlet side of the gear pump and the liquid inlet of the piston cylinder, and between the inlet side of the gear pump and the liquid outlet of the piston cylinder.

[0009] By adopting the above technical solution, the linear driver one drives the pressure rod and the chuck to move downward, and the clamping plates on the chuck can clamp and center the grooved elbow pipe fitting placed on the rubber pad on the base, which is beneficial to reducing the offset distance between the end face of the grooved elbow pipe fitting and the rubber pad, thereby facilitating reducing the time for manually adjusting the grooved elbow pipe fitting and improving the testing efficiency. After the test, the linear driver one drives the pressure rod and the chuck to move upward, the chuck abuts against the locking member, and then, the linear driver one drives the pressure rod and the chuck to move downward, the chuck drives the locking member and the piston rod to move downward synchronously, the oil liquid in the piston cylinder enters the inlet side of the gear pump from the liquid outlet, the gear pump drives the rubber pad to rotate, and the oil liquid enters the liquid inlet of the piston cylinder from the outlet side of the gear pump. After one test of the present invention, the gear pump drives the rubber pad to rotate once, which is beneficial to reducing the wear of the lower part of the rubber pad close to the lower end due to long-term contact with the end face of the grooved elbow pipe fitting, thereby facilitating reducing the situation that the end face of the grooved elbow pipe fitting does not fit tightly with the rubber pad, and further facilitating reducing the error of the leak tightness test of the grooved elbow pipe fitting.

[0010] Preferably, the connecting member includes a sleeve and a connecting column which are slidably connected, a return spring two is connected between the connecting column and the sleeve, spherical corners are arranged at the ends of the sleeve and the connecting column, and the chuck is connected to the sleeve and the clamping plate is connected to the connecting column through the spherical corners.

[0011] By adopting the above technical solution, when the two clamping plates clamp the grooved elbow pipe fitting, the lower part of the clamping plate first opens, the clamping plate inclines, as the clamping plate moves downward, the clamping plate clamps the two sides of the grooved elbow pipe fitting, and the clamping plate slowly returns to the vertical state, and the return spring two contracts, which is beneficial to realizing the clamping and centering of the grooved elbow pipe fitting.

[0012] Preferably, the locking member includes a locking frame installed at the lower end of the piston rod and a locking tongue provided at the lower end of the locking frame. The lower end of the locking frame is provided with an inverted U-shaped locking groove. A strip-shaped mounting post is rotatably connected in the locking groove. An arc surface is provided between two adjacent side surfaces of the mounting post. The two sides of the locking groove are rotatably connected with a rotating shaft penetrating through the locking groove. A torsion spring is connected between the mounting post and the rotating shaft. The locking tongue is connected to the mounting post. A limiting rod penetrating through the rotating shaft is provided below the piston cylinder.

[0013] By adopting the above technical solution, after testing, the linear actuator I drives the pressure rod and the chuck to move upward. During the upward movement of the chuck, the chuck pushes the locking tongue to retract. After the upper part of the chuck gradually moves above the locking tongue, the locking tongue resets. Then, the linear actuator I drives the pressure rod and the chuck to move downward. The downward movement of the chuck drives the locking tongue and the locking frame to move downward. The locking frame drives the piston rod to move downward, so that the hydraulic oil in the piston cylinder enters the gear pump. The gear pump drives the rubber pad to rotate, which is beneficial to reducing the wear of the part near the lower end of the rubber pad due to long-term contact with the end face of the grooved elbow pipe fitting, and thus is beneficial to reducing the situation that the end face of the grooved elbow pipe fitting does not fit tightly with the rubber pad.

[0014] Preferably, a piston plate is provided at the upper part of the piston rod. The piston plate divides the piston cylinder into an upper chamber and a lower chamber. A one-way valve is provided on the piston plate. The liquid outlet of the piston cylinder is arranged on the lower chamber, and the liquid inlet of the piston cylinder is arranged on the upper chamber.

[0015] By adopting the above technical solution, after the piston rod drives the piston plate to move downward, the lower chamber is compressed. The hydraulic oil in the lower chamber enters the inlet side of the gear pump through the liquid outlet. The gear pump drives the rubber pad to rotate. The hydraulic oil enters the upper chamber through the outlet side of the gear pump. The hydraulic oil in the upper chamber enters the lower chamber through the one-way valve.

[0016] Preferably, the connecting frame includes a connecting plate fixedly connected to the pressure rod and connecting rods provided on both sides of the connecting plate. A sliding groove is formed on one side of the connecting rod. Two connecting cylinders are provided on the upper end surface of the chuck. The two connecting cylinders and the two connecting rods correspond one by one. A convex block capable of being clamped in the sliding groove is provided in the connecting cylinder. A tension spring is arranged between the connecting rod and the connecting cylinder.

[0017] By adopting the above technical solution, during the process of the linear actuator I driving the pressure rod and the connecting frame to move downward, the lower end surface of the sliding groove contacts the convex block and drives the connecting cylinder and the chuck to move downward. When the chuck clamps the grooved elbow pipe fitting, as the pressure rod continues to move downward, the connecting rod moves downward, and the connecting cylinder and the chuck no longer move downward, while the convex block slides in the sliding groove, so that the pressure rod squeezes the grooved elbow pipe fitting. After testing, the linear actuator I drives the pressure rod and the connecting frame to move upward. The connecting cylinder and the chuck do not move upward at the beginning. The convex block slides in the sliding groove until the convex block contacts the lower end surface of the sliding groove, and then the connecting rod drives the connecting cylinder and the chuck to move upward. In this way, there is a gap between the grooved elbow pipe fitting and the lower end surface of the pressure rod, which is beneficial to removing the grooved elbow pipe fitting from the chuck.

[0018] Preferably, the installation groove includes two mounting plates provided on the frame. V-shaped grooves are formed on the upper end surfaces of the two mounting plates. Expansion rods are provided on both sides of the mounting plates. Ball heads connected to one end of the base are provided at the upper ends of the expansion rods. The other end of the base abuts against the V-shaped groove.

[0019] By adopting the above technical solution, the length of the expansion rod can be adjusted, and the included angle between the two bases can be adjusted, which can be used for the airtightness test of groove elbow pipe fittings with different bending angles.

[0020] Preferably, a water tank is slidably provided below the frame. A top head is provided on the side of the water tank. A linear actuator II for driving the top head to lift is provided on the frame.

[0021] By adopting the above technical solution, during detection, the linear actuator II drives the top head to move upward, and the top head drives the water tank to move upward, so that the two end faces of the groove elbow pipe fitting are submerged under the water surface of the water tank. After the groove elbow pipe fitting is ventilated, observe whether bubbles are generated on the water surface to judge the airtightness of the groove elbow pipe fitting.

[0022] Preferably, a hydraulic bottle is provided on one side of the frame. A universal rotary joint is installed on the rubber pad. A flexible air delivery pipe is connected between the air outlet of the hydraulic bottle and the universal rotary joint.

[0023] By adopting the above technical solution, during detection, the gas in the hydraulic bottle enters the groove elbow pipe fitting through the air delivery pipe, and observe whether bubbles are generated on the water surface of the water tank to judge the airtightness of the groove elbow pipe fitting.

[0024] The beneficial effects of the above technical solutions of the present invention are as follows:

[0025] 1. The clamping plate on the chuck of the present invention can clamp and center the groove elbow pipe fitting placed on the rubber pad of the base, which is beneficial to reducing the offset distance between the end face of the groove elbow pipe fitting and the rubber pad. After one test, the gear pump drives the rubber pad to rotate once, which is beneficial to reducing the wear of the lower part of the rubber pad close to the lower end due to long-term contact with the end face of the groove elbow pipe fitting, thereby being beneficial to reducing the situation where the end face of the groove elbow pipe fitting and the rubber pad do not fit tightly, and further being beneficial to reducing the error of the airtightness test of the groove elbow pipe fitting.

[0026] 2. When the chuck of the present invention clamps the groove elbow pipe fitting, the pressure rod extrudes the groove elbow pipe fitting. After the test, the pressure rod drives the chuck and the groove elbow pipe fitting to move upward, and there is a gap between the pressure rod and the groove elbow, which is beneficial to removing the groove elbow pipe fitting from the chuck.

[0027] 3. The included angle between the two bases of the present invention can be adjusted, which can be used for the airtightness test of groove elbow pipe fittings with different bending angles. Description of the Drawings

[0028] Figure 1 This is a schematic structural diagram of a airtightness test pressure machine for a grooved elbow pipe fitting of the present invention;

[0029] Figure 2 is Figure 1 an enlarged view of part A in;

[0030] Figure 3 This is a cross-sectional view of the pressure rod and the chuck of the present invention;

[0031] Figure 4 This is a schematic structural diagram of the pressure rod, the chuck and the piston cylinder of the present invention;

[0032] Figure 5 This is a cross-sectional view of the piston cylinder of the present invention;

[0033] Figure 6 This is a cross-sectional view of the clamping member of the present invention.

[0034] In the figure: 1, frame; 11, water tank; 12, top head; 13, linear driver II; 14, hydraulic bottle; 2, mounting groove; 21, mounting plate; 22, base; 23, telescopic rod; 24, rubber pad; 25, gear pump; 3, pressure rod; 31, pressure head; 4, linear driver I; 5, connecting frame; 51, connecting plate; 52, connecting rod; 521, sliding groove; 6, chuck; 61, top plate; 62, side plate; 63, clamping plate; 64, connecting cylinder; 641, convex block; 65, tension spring; 66, spring pin; 67, connecting member; 671, sleeve; 672, connecting column; 673, return spring II; 674, spherical angle; 7, piston cylinder; 71, piston rod; 72, return spring I; 73, piston plate; 74, one-way valve; 75, upper chamber; 751, liquid inlet; 76, lower chamber; 761, liquid outlet; 8, locking member; 81, locking frame; 811, locking groove; 812, mounting column; 813, arc surface; 814, rotating shaft; 815, torsion spring; 816, limiting rod; 82, locking tongue; 9, grooved elbow pipe fitting. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will combine the Figures 1-6 of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention fall within the scope of protection of the present invention.

[0036] Embodiment

[0037] This embodiment provides a airtightness test pressure machine for a grooved elbow pipe fitting, as shown in Figure 1 andFigure 2 As shown in the figure, it includes a frame 1, a mounting groove 2 and a pressing rod 3.

[0038] As Figure 1 and Figure 2 shown, the mounting groove 2 is arranged at the lower part of the frame 1 for placing the grooved elbow pipe fitting 9. The mounting groove 2 includes two mounting plates 21 and two bases 22. Multiple mounting grooves 2 are provided on the frame 1, and multiple grooved elbow pipe fittings 9 can be tested simultaneously.

[0039] As Figure 1 and Figure 2 shown, the two mounting plates 21 are arranged in parallel on the frame 1. V-shaped grooves are formed on the upper end faces of the two mounting plates 21. Each base 22 is installed on the same side of the two V-shaped grooves. Telescopic rods 23 are provided on both sides of the mounting plate 21. Ball heads connected to one end of the base 22 are provided at the upper ends of the telescopic rods 23. The other end of the base 22 abuts against the V-shaped groove.

[0040] As Figure 2 shown, a rubber pad 24 is provided on the base 22. The grooved elbow pipe fitting 9 is placed on the base 22, and the end face of the grooved elbow pipe fitting 9 abuts against the rubber pad 24. By adjusting the length of the telescopic rod 23, the included angle between the two bases 22 can be adjusted, which can be used for the airtightness test of grooved elbow pipe fittings 9 with different bending angles.

[0041] As Figure 1 and Figure 2 shown, a pressing rod 3 and a linear driver 1 4 for driving the pressing rod 3 to lift and lower are slidably arranged above the frame 1. As Figure 3 shown, a pressing head 31 is installed at the lower end of the pressing rod 3. An arc surface is provided below the pressing head 31 for squeezing the grooved elbow pipe fitting 9 placed on the base 22.

[0042] As Figure 1 and Figure 2 shown, the pressing rod 3 is arranged at the upper part of the mounting groove 2. The numbers of the linear driver 1 4, the pressing rod 3 and the mounting groove 2 are the same, and the pressing rod 3 and the mounting groove 2 correspond one by one. The linear driver 1 4 is a cylinder or a hydraulic cylinder.

[0043] As Figure 2 and Figure 3 shown, a connecting frame 5 is installed above the lower part of the pressing rod 3 where the pressing head 31 is located. The connecting frame 5 includes a connecting plate 51 fixedly connected to the pressing rod 3 and connecting rods 52 arranged on both sides of the connecting plate 51. A sliding groove 521 is formed on one side of the connecting rod 52.

[0044] As Figure 2 and Figure 3 shown, a connecting cylinder 64 is sleeved outside the connecting rod 52. A tension spring 65 is connected between the connecting rod 52 and the connecting cylinder 64. The lower parts of the two connecting cylinders 64 are connected with an inverted U-shaped chuck 6.

[0045] As shown Figure 3 in the figure, the chuck 6 includes a top plate 61 and two side plates 62 connected to both sides of the top plate 61. Above the top plate 61, there is a convex block 641. The convex block 641 is located inside the connecting cylinder 64 and can be clamped in the sliding groove 521 and slide within the sliding groove 521. A through hole is formed in the top plate 61, and the pressure rod 3 passes through the through hole. The pressing head 31 is located below the top plate 61.

[0046] As shown Figure 3 in the figure, two clamping plates 63 are arranged in parallel between the two side plates 62. The clamping plates 63 are parallel to the side plates 62, and each side plate 62 corresponds to each clamping plate 63 one by one. A spring pin 66 and a connecting member 67 are connected between each side plate 62 and each clamping plate 63. The connecting member 67 is located above the spring pin 66.

[0047] As shown Figure 3 in the figure, the connecting member 67 includes a sliding sleeve 671 and a connecting column 672. The sleeve 671 is sleeved outside the connecting column 672. A second return spring 673 is connected between the connecting column 672 and the sleeve 671. Ball corners 674 are provided at the ends of the sleeve 671 and the connecting column 672. The side plate 62 of the chuck 6 and the sleeve 671, and between the clamping plate 63 and the connecting column 672 are connected through the ball corners 674. Ball corner grooves are provided between the side plate 62 and the clamping plate 63. The two ball corners 674 are respectively installed in the two ball corner grooves and can rotate within the ball corner grooves.

[0048] As shown Figure 3 in the figure, the spring pin 66 and the connecting member 67 can drive the clamping plate 63 to move away from or close to the side plate 62 on one side.

[0049] As shown Figure 1 and Figure 2 in the figure, the linear actuator 4 drives the pressure rod 3 and the chuck 6 to move downward. When the two clamping plates 63 clamp the grooved elbow pipe fitting 9, as Figure 3 shown in the figure, the lower part of the clamping plate 63 first opens, and the clamping plate 63 is inclined. As the clamping plate 63 moves downward, the clamping plate 63 clamps the two sides of the grooved elbow pipe fitting 9. The clamping plate 63 slowly returns to the vertical state, and the second return spring 673 contracts, which is beneficial to realizing the clamping and centering of the grooved elbow pipe fitting 9 and is beneficial to reducing the offset distance between the end face of the grooved elbow pipe fitting 9 and the rubber pad 24.

[0050] As shown Figure 1 and Figure 2 in the figure, a piston cylinder 7 is provided at a position on the frame 1 close to the pressure rod 3. The number of piston cylinders 7 is the same as the number of pressure rods 3.

[0051] As shown Figure 4 and Figure 5As shown in the figure, a piston rod 71 is slidably arranged in a piston cylinder 7. A piston plate 73 is arranged on the upper part of the piston rod 71. The piston plate 73 divides the piston cylinder 7 into an upper chamber 75 and a lower chamber 76. A one-way valve 74 is arranged on the piston plate 73. The liquid outlet 761 of the piston cylinder 7 is arranged on the lower chamber 76, and the liquid inlet 751 of the piston cylinder 7 is arranged on the upper chamber 75. A first return spring 72 is connected between the piston rod 71 and the piston cylinder 7.

[0052] As Figure 5 shown in the figure, the lower end of the piston rod 71 passes through the lower chamber 76. A locking member 8 which can abut against the chuck 6 is connected to the lower end of the piston rod 71. The locking member 8 includes a locking frame 81 and a locking tongue 82.

[0053] Among them, as Figure 5 shown in the figure, the locking frame 81 is installed at the lower end of the piston rod 71. The locking frame 81 is L-shaped. A reverse U-shaped locking groove 811 is arranged at the lower part of the locking frame 81. A strip-shaped mounting post 812 is rotatably connected in the locking groove 811. As Figure 4 shown in the figure, an arc surface 813 is arranged between two adjacent side surfaces of the mounting post 812 near the upper part of the locking groove 811. Rotating shafts 814 penetrating through the locking groove 811 are rotatably connected to both sides of the locking groove 811. As Figure 6 shown in the figure, a torsion spring 815 is connected between the mounting post 812 and the rotating shaft 814. The locking tongue 82 is connected to the mounting post 812. A limiting rod 816 penetrating through the rotating shaft 814 is arranged below the piston cylinder 7. Relative sliding can occur between the limiting rod 816 and the rotating shaft 814.

[0054] As Figure 2 and Figure 5 shown in the figure, a gear pump 25 which can drive a rubber pad 24 to rotate is arranged on a base 22. Hoses (not marked in the figure) are connected between the outlet side of the gear pump 25 and the liquid inlet 751 of the piston cylinder 7, and between the inlet side of the gear pump 25 and the liquid outlet 761 of the piston cylinder 7.

[0055] After testing, as Figure 1 and Figure 2 shown in the figure, a linear actuator 4 drives a pressure rod 3 and a chuck 6 to move upward. As Figure 6 shown in the figure, during the upward movement of the chuck 6, the locking tongue 82 is pushed to retract. After the top plate 61 of the chuck 6 gradually moves above the locking tongue 82, the locking tongue 82 resets. Then the linear actuator 4 drives the pressure rod 3 and the chuck 6 to move downward. As Figure 5As shown, due to the limitation of the limiting rod 816, when the chuck 6 moves downward, it drives the lock tongue 82 and the locking frame 81 to move downward. The locking frame 81 drives the piston rod 71 to move downward, causing the hydraulic fluid in the piston cylinder 7 to enter the gear pump 25. The gear pump 25 drives the rubber pad 24 to rotate, which helps to reduce the wear of the lower part of the rubber pad 24 due to long-term contact with the end face of the grooved elbow pipe fitting 9, and thus helps to reduce the situation where the end face of the grooved elbow pipe fitting 9 does not fit tightly with the rubber pad 24.

[0056] As Figure 4 and Figure 5 shown, when the chuck 6 drives the locking frame 81 to move to the point where the rotating shaft 814 is disengaged from the limiting rod 816, the limiting rod 816 loses its limitation on the rotating shaft 814, the lock tongue 82 deflects downward. After the top plate 61 of the chuck 6 is disengaged from the lock tongue 82, the lock tongue 82 resets, and the top plate 61 is located below the lock tongue 82, and then the detection of the next grooved elbow pipe fitting 9 can be carried out.

[0057] As Figure 1 shown, a water tank 11 is slidably provided below the frame 1, a top head 12 is provided on the side of the water tank 11, and a linear actuator two 13 for driving the top head 12 to lift and lower is provided on the frame 1. The linear actuator two 13 is a cylinder or a hydraulic cylinder.

[0058] As Figure 1 shown, a hydraulic bottle 14 is provided on one side of the frame 1, a universal rotary joint (not marked in the figure) is installed on the rubber pad 24, and a flexible air delivery pipe (not marked in the figure) is connected between the air outlet of the hydraulic bottle 14 and the universal rotary joint.

[0059] During the detection, as Figure 1 and Figure 2 shown, the linear actuator two 13 drives the top head 12 to move upward, the top head 12 drives the water tank 11 to move upward, submerging the two end faces of the grooved elbow pipe fitting 9 under the water surface of the water tank 11. The gas in the hydraulic bottle 14 enters the grooved elbow pipe fitting 9 through the air delivery pipe, and observe whether bubbles are generated on the water surface of the water tank 11 to judge the air tightness of the grooved elbow pipe fitting 9.

[0060] The implementation principle of the air tightness test and pressure testing machine for the grooved elbow pipe fitting in this embodiment:

[0061] Place the grooved elbow fitting 9 on the base 22 of the installation groove 2. The linear actuator 4 drives the pressure rod 3 and the chuck 6 to move downward. When the two clamping plates 63 clamp the grooved elbow fitting 9, the lower part of the clamping plate 63 first opens, and the clamping plate 63 inclines. As the clamping plate 63 moves downward, the clamping plate 63 clamps the two sides of the grooved elbow fitting 9, and the clamping plate 63 slowly returns to the vertical state. When the chuck 6 clamps the grooved elbow fitting 9, as the pressure rod 3 continues to move downward, the connecting rod 52 moves downward, and the connecting cylinder 64 and the chuck 6 no longer move downward, while the convex block 641 slides in the chute 521, so that the pressure rod 3 squeezes the grooved elbow fitting 9;

[0062] During detection, the linear actuator 13 drives the top head 12 to move upward, and the top head 12 drives the water tank 11 to move upward, so that the two end faces of the grooved elbow fitting 9 are submerged under the water surface of the water tank 11. The gas in the hydraulic bottle 14 enters the grooved elbow fitting 9 through the air pipe, and observe whether bubbles are generated on the water surface of the water tank 11 to judge the airtightness of the grooved elbow fitting 9;

[0063] After testing, the linear actuator 4 drives the pressure rod 3 and the connecting frame 5 to move upward. The connecting cylinder 64 and the chuck 6 do not move upward at first, and the convex block 641 slides in the chute 521 until the convex block 641 contacts the lower end face of the chute 521, and then the connecting rod 52 drives the connecting cylinder 64 and the chuck 6 to move upward. There is a gap between the grooved elbow fitting 9 and the lower end face of the pressure rod 3, which is beneficial to remove the grooved elbow fitting 9 from the chuck 6;

[0064] The linear actuator 4 drives the pressure rod 3 and the chuck 6 to continue to move upward. During the upward movement of the chuck 6, the locking tongue 82 is pushed to retract, and when the top plate 61 of the chuck 6 gradually moves above the locking tongue 82, the locking tongue 82 resets. Then the linear actuator 4 drives the pressure rod 3 and the chuck 6 to move downward. Due to the limitation of the limiting rod 816, the downward movement of the chuck 6 drives the locking tongue 82 and the locking bracket 81 to move downward, and the locking bracket 81 drives the piston rod 71 to move downward, so that the oil in the piston cylinder 7 enters the gear pump 25, and the gear pump 25 drives the rubber pad 24 to rotate;

[0065] When the chuck 6 drives the locking bracket 81 to move to the position where the rotating shaft 814 is disengaged from the limiting rod 816, the limiting rod 816 loses the limitation on the rotating shaft 814, and the locking tongue 82 deflects downward. After the top plate 61 of the chuck 6 is disengaged from the locking tongue 82, the locking tongue 82 resets, and the top plate 61 is located below the locking tongue 82, and then the detection of the next grooved elbow fitting 9 can be carried out.

[0066] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] The above is the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle described in the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A leak tightness testing and pressure boosting machine for a grooved elbow pipe fitting, comprising a frame (1), a mounting groove (2) and a pressure rod (3) arranged on the frame (1); the mounting groove (2) includes two V-shaped bases (22), a rubber pad (24) is arranged on the base (22), and a linear actuator one (4) for driving the pressure rod (3) to lift and lower is arranged on the frame (1); it is characterized in that: A connecting frame (5) is installed at the lower part of the pressure rod (3), an inverted U-shaped chuck (6) is slidably arranged on the connecting frame (5), a tension spring (65) is connected between the upper end of the chuck (6) and the connecting frame (5), two clamping plates (63) are connected inside the chuck (6) through spring pins (66), and a connecting piece (67) is also connected between the clamping plate (63) and the chuck (6); A piston cylinder (7) is arranged on the frame (1), a piston rod (71) is arranged inside the piston cylinder (7), a return spring one (72) is connected between the piston rod (71) and the piston cylinder (7), a locking member (8) capable of abutting against the chuck (6) is connected to the piston rod (71), a gear pump (25) capable of driving the rubber pad (24) to rotate is arranged on the base (22), and hoses are connected between the outlet side of the gear pump (25) and the liquid inlet (751) of the piston cylinder (7), and between the inlet side of the gear pump (25) and the liquid outlet (761) of the piston cylinder (7).

2. The airtightness test pressure machine for the grooved elbow pipe fitting according to claim 1, wherein: The connecting piece (67) includes a sliding sleeve (671) and a connecting column (672), a return spring two (673) is connected between the connecting column (672) and the sleeve (671), spherical corners (674) are arranged at the ends of the sleeve (671) and the connecting column (672), and the chuck (6) and the sleeve (671), and the clamping plate (63) and the connecting column (672) are connected through the spherical corners (674).

3. The airtightness test pressure machine for the grooved elbow pipe fitting according to claim 2, characterized in that: The locking member (8) includes a locking frame (81) installed at the lower end of the piston rod (71) and a locking tongue (82) arranged at the lower end of the locking frame (81). An inverted U-shaped locking groove (811) is arranged at the lower end of the locking frame (81). A strip-shaped mounting column (812) is rotatably connected inside the locking groove (811). An arc surface (813) is arranged between two adjacent sides of the mounting column (812). A rotating shaft (814) passing through the locking groove (811) is rotatably connected to both sides of the locking groove (811). A torsion spring (815) is connected between the mounting column (812) and the rotating shaft (814). The locking tongue (82) is connected to the mounting column (812). A limiting rod (816) passing through the rotating shaft (814) is arranged below the piston cylinder (7).

4. The airtightness test pressure machine for the grooved elbow pipe fitting according to claim 3, characterized in that: A piston plate (73) is arranged at the upper part of the piston rod (71). The piston plate (73) divides the piston cylinder (7) into an upper chamber (75) and a lower chamber (76). A one-way valve (74) is arranged on the piston plate (73). The liquid outlet (761) of the piston cylinder (7) is arranged on the lower chamber (76), and the liquid inlet (751) of the piston cylinder (7) is arranged on the upper chamber (75).

5. The airtightness test and pressure application machine for the grooved elbow pipe fitting according to claim 4, characterized in that: The connecting frame (5) includes a connecting plate (51) fixedly connected to the pressure bar (3) and connecting rods (52) arranged on both sides of the connecting plate (51). A sliding groove (521) is formed on one side of the connecting rod (52). Two connecting cylinders (64) are provided on the upper end surface of the chuck (6). The two connecting cylinders (64) and the two connecting rods (52) correspond one by one. A convex block (641) capable of being clamped in the sliding groove (521) is provided in the connecting cylinder (64). A tension spring (65) is arranged between the connecting rod (52) and the connecting cylinder (64).

6. The airtightness test pressure machine for the grooved elbow pipe fitting according to claim 5, characterized in that: The installation groove (2) includes two installation plates (21) arranged on the frame (1). V-shaped grooves are formed on the upper end surfaces of the two installation plates (21). Expansion rods (23) are arranged on both sides of the installation plate (21). The upper end of the expansion rod (23) is provided with a ball head connected to one end of the base (22), and the other end of the base (22) abuts against the V-shaped groove.

7. The airtightness test pressure machine for grooved elbow pipe fittings according to claim 6, characterized in that: A water tank (11) is slidably arranged below the frame (1). A top head (12) is arranged on the side surface of the water tank (11). A linear actuator two (13) for driving the top head (12) to lift and lower is arranged on the frame (1).

8. The airtightness test pressure machine for the grooved elbow pipe fitting according to claim 7, characterized in that: A hydraulic bottle (14) is arranged on one side of the frame (1). A universal rotary joint is installed on the rubber pad (24). A flexible air pipe is connected between the air outlet of the hydraulic bottle (14) and the universal rotary joint.

Images