Universal riser tube leak hunting tool

Abstract

The utility model relates to a general riser tube leak hunting tool comprising the following structures: a support assembly comprising a bottom plate provided with an air inlet pedestal, the center of which is provided with a lower core head, and the air inlet pedestal is internally provided with a lower sealing gasket; the downward pressing assembly comprises a top plate which is parallel to the bottom plate, a guide column is connected between the top plate and the bottom plate in the vertical direction, a linear driving piece is arranged on the top plate, the output end of the linear driving piece is connected with a stabilizing plate parallel to the top plate, the stabilizing plate is movably assembled on the guide column through a guide sleeve, and an air outlet top seat is arranged at the bottom of the stabilizing plate; an upper core head coaxial with the lower core head is arranged in the center of the air outlet top seat, an upper sealing gasket is arranged in the air outlet top seat, and an air outlet channel is formed in the upper core head; and the positioning assembly comprises two positioning units which are fixedly arranged on the guide columns between the upper core head and the lower core head respectively. The device is suitable for riser tubes with different outer diameters through the positioning unit, and the to-be-tested piece and the core head connecting line are kept coaxial, so that the perpendicularity of the riser tubes is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness detection, in particular to a universal rising pipe leak detection tool. Background Art

[0002] Low-pressure casting is to place the mold on top of a closed furnace, and the bottom of the mold cavity is connected to the molten metal in the furnace through a tube (called a riser). If pressurized air is added to the surface of the molten metal in the furnace, the molten metal will flow into the cavity from the riser. After the molten metal solidifies, the compressed air in the furnace is released, and the unsolidified metal flows back into the furnace from the riser. The use of the riser is a very important part of low-pressure casting. Different low-pressure machine riser models have a variety of designs for different products. Whether the riser is leaking has a great impact on the quality of the casting, so it is very important to inspect the riser before entering the factory.

[0003] In the prior art, a leak detection tool is usually used to detect leaks on a riser tube. The existing leak detection tool has the following main problems: first, it can only be applied to one type of riser tube, which affects production efficiency. Secondly, leak detection tools include horizontal and vertical types. The vertical type is easier to lay out and has higher applicability. However, during the test of the vertical tool, due to the lack of concentricity between the test piece and the tool, the verticality of the test piece is poor, resulting in uneven force on the contact surface and gaps, which can easily lead to misjudgment. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a universal riser tube leak detection tool, which can be used to perform leak detection on riser tubes of different models, effectively improving test efficiency and preventing test misjudgments.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A universal riser pipe leak detection tool, comprising a support assembly, a pressing assembly and a positioning assembly;

[0007] The support assembly includes a bottom plate, on which an air intake base is arranged, a lower core head is arranged on the upper part of the central air intake passage of the air intake base, an air intake passage is arranged in the lower core head, the inlet of the air intake passage is connected with the outlet of the central air intake passage, the outlet of the air intake passage is located at the top surface of the lower core head, and a lower sealing gasket is arranged in the air intake base;

[0008] The down-pressing assembly is located below the supporting assembly, and the structure of the down-pressing assembly includes a top plate, which is arranged in parallel with the bottom plate, and a guide column is connected between the two in a vertical direction, a linear driving member is arranged on the top plate, and an output end of the linear driving member is connected to a stabilizing plate arranged in parallel with the top plate, which is movably assembled on the guide column through a guide sleeve, an air outlet top seat is arranged at the bottom of the stabilizing plate, an upper core head which is coaxially arranged with the lower core head is arranged at the lower part of the central air outlet passage of the air outlet top seat, an air outlet channel is arranged in the upper core head, the outlet of the air outlet channel is connected with the inlet of the central air outlet channel, the inlet of the air outlet channel is located at the bottom end surface of the upper core head, and an upper sealing gasket is arranged in the air outlet top seat;

[0009] The positioning assembly includes two positioning units spaced apart at an upper and a lower position. The two positioning units have the same structure and are respectively fixed on the guide pillars between the upper core head and the lower core head. The two positioning units are used to provide two groups of positioning points distributed along the axial direction for the test piece, so that the test piece maintains coaxiality with the axis of the upper core head and the lower core head, thereby ensuring verticality.

[0010] Further technical solutions are:

[0011] The guide pillars include two groups arranged at intervals, each group includes two guide pillars arranged at intervals, and the structure of the positioning unit is as follows: including a fixed block, the fixed block is fixedly sleeved on one group of guide pillars, one end of the fixed block is fixedly connected to one end of the first connecting rod, a V-shaped block is provided on the inner side of the first connecting rod, and the other end of the first connecting rod is rotatably connected to the first end of the screw pull rod;

[0012] The other end of the fixed block is rotatably connected to one end of the second connecting rod. An I-shaped block is provided on the inner side of the second connecting rod. The other end of the second connecting rod is used to cooperate and lock with the second end of the screw rod, thereby fixing the test piece between the V-shaped block and the I-shaped block.

[0013] A limiting column is provided at the second end of the screw rod, and a clearance groove is provided at the other end of the second connecting rod, which is used to vertically position it through the screw rod. A limiting groove matching the contour of the limiting column is provided on the outer side of the second connecting rod near the clearance groove.

[0014] The screw pull rod is provided with a handle means on the outer side of the limiting column.

[0015] A pressure transmitter is provided on one side of the stabilizing plate, and its inlet is connected to the air outlet on the air outlet top seat through a conduit, and the air outlet on the air outlet top seat is communicated with the outlet of the upper core head air outlet channel.

[0016] The inlet of the central air inlet is connected to an external air source, and a total pressure gauge and an intermediate pressure gauge are arranged on the connecting pipeline, and a regulating valve is arranged on the pipeline between the total pressure gauge and the intermediate pressure gauge.

[0017] The structure of the air intake base includes a guide pressure plate, which is provided with a lower mounting groove for positioning the lower core head. The outlet of the central air intake duct is located at the bottom surface of the lower mounting groove. The top of the guide pressure plate fixes the lower sealing gasket to the outer periphery of the lower core head through a lower pressure ring.

[0018] The structure of the air outlet top seat includes a floating sleeve, which is provided with an upper mounting groove for positioning the upper core head. The inlet of the central air outlet is located at the bottom surface of the upper mounting groove. The bottom of the floating sleeve fixes the upper sealing gasket to the outer periphery of the upper core head through an upper pressure ring.

[0019] The top end surface extends out of the upper surface of the lower sealing gasket.

[0020] The bottom end surface extends out of the lower surface of the upper sealing gasket.

[0021] The beneficial effects of the utility model are as follows:

[0022] The utility model can realize self-centering of liquid riser tubes with different outer diameters through the cooperation of the screw pull rod and the second connecting rod and the cooperation of the V-shaped block and the straight-shaped block, thereby ensuring the verticality of the liquid riser tube during the detection process. The utility model can be applied to liquid riser tubes with different heights through the adjustment of the linear drive member. The utility model can realize continuous testing of liquid riser tubes with different specifications, has strong versatility, and improves work efficiency.

[0023] The utility model ensures uniform contact between the upper and lower sealing pads and the end face of the pipe mouth by improving the verticality of the liquid riser, thereby ensuring uniform force on the liquid riser, which can greatly improve the air tightness of the pipe mouth position and prevent misjudgment of the test to the greatest extent.

[0024] The present invention can realize testing under different air pressures.

[0025] Other features and advantages of the present invention will be described in the following description or will be understood by implementing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the utility model.

[0027] Figure 2 for Figure 1 Another perspective of .

[0028] Figure 3 The figure is a schematic diagram of the installation structure of the positioning unit according to the embodiment of the utility model.

[0029] Figure 4 It is a schematic structural diagram of the second connecting rod of an embodiment of the utility model.

[0030] Figure 5 It is a schematic diagram of the working state of an embodiment of the utility model.

[0031] In the figure: 1. linear drive member; 2. stabilizing plate; 3. guide column; 4. positioning unit; 5. lower core head; 6. lower pressure ring; 7. lower sealing gasket; 8. guide pressure plate; 9. pressure transmitter; 10. conduit; 11. floating sleeve; 12. upper pressure ring; 13. upper sealing gasket; 14. riser pipe to be measured; 15. top plate; 16. bottom plate; 17. intermediate pressure gauge; 18. total pressure gauge; 19. upper core head; 41. fixing block; 42. first connecting rod; 43. V-shaped block; 44. second connecting rod; 45. straight block; 46. screw pull rod; 51. air inlet channel; 191. air outlet channel; 441. clearance groove; 442. limit groove; 462. limit column; 463. handle. DETAILED DESCRIPTION

[0032] The specific implementation of the present utility model is described below with reference to the accompanying drawings.

[0033] like Figure 1 , Figure 2 As shown, the universal riser tube leak detection tool of this embodiment includes a support assembly, a pressing assembly and a positioning assembly;

[0034] The support assembly includes a bottom plate 16, on which an air intake base is provided, a lower core head 5 is provided on the upper part of the central air intake passage of the air intake base, an air intake channel 51 is provided in the lower core head 5, the inlet of the air intake channel 51 is communicated with the outlet of the central air intake passage, the outlet of the air intake channel 51 is located at the top surface of the lower core head 5, and a lower sealing gasket 7 is provided in the air intake base;

[0035] The pressing down assembly is located below the supporting assembly, and the structure of the pressing down assembly includes a top plate 15, which is arranged in parallel with the bottom plate 16, and a guide column 3 is connected between the two in the vertical direction. A linear driving member 1 is provided on the top plate 15, and a stabilizing plate 2 arranged in parallel with the top plate 15 is connected to its output end, and the stabilizing plate 2 is movably assembled on the guide column 3 through a guide sleeve. An air outlet top seat is provided at the bottom of the stabilizing plate 2, and an upper core head 19 coaxially arranged with the lower core head 5 is provided at the lower part of the central air outlet of the air outlet top seat, and an air outlet channel 191 is provided in the upper core head 19, and the outlet of the air outlet channel 191 is connected with the inlet of the central air outlet, and the inlet of the air outlet channel 191 is located at the bottom end surface of the upper core head 19, and an upper sealing gasket 13 is provided in the air outlet top seat;

[0036] The positioning assembly includes two positioning units 4 spaced apart at an upper and a lower position. The two positioning units 4 have the same structure and are respectively fixed on the guide column 3 between the upper core head 19 and the lower core head 5. The two positioning units 4 are used to provide two groups of positioning points distributed along the axial direction for the test piece, so that the axis of the test piece and the lower core head 5 and the upper core head 19 remain coaxial (the axes coincide or are parallel), thereby ensuring verticality.

[0037] like Figure 1 , Figure 3 and Figure 4 As shown, the guide pillars 3 include two groups arranged at intervals, each group includes two guide pillars arranged at intervals, and the structure of the positioning unit 4 is as follows: including a fixing block 41, the fixing block 41 is fixedly sleeved on one group of guide pillars 3 at the same time, one end of the fixing block 41 is fixedly connected to one end of a first connecting rod 42, a V-shaped block 43 is provided on the inner side of the first connecting rod 42, and the other end of the first connecting rod 42 is rotatably connected to the first end of a screw pull rod 46;

[0038] The other end of the fixing block 41 is rotatably connected to one end of the second connecting rod 44. An I-shaped block 45 is provided on the inner side of the second connecting rod 44. The other end of the second connecting rod 44 is used to cooperate and lock with the second end of the screw rod 46, so as to fix the test piece between the V-shaped block 43 and the I-shaped block 45.

[0039] A limiting column 462 is provided at the second end of the screw rod 46, and a clearance groove 441 is provided at the other end of the second connecting rod 44, which is used to vertically position it through the screw rod 46. A limiting groove 442 matching the contour of the limiting column 462 is provided on the outer side of the second connecting rod 44 near the clearance groove 441.

[0040] The screw rod 46 is provided with a handle 463 on the outer side of the limiting column 462 for easy screwing.

[0041] Specifically, an upper mounting frame is provided on one side of the stabilizing plate 2, in which a pressure transmitter 9 is provided, and its inlet is connected to the air outlet on the air outlet top seat through a conduit 10, and the air outlet on the air outlet top seat is connected to the outlet of the air outlet channel 191 of the upper core head 19.

[0042] Specifically, the inlet of the central air inlet is connected to an external air source, and a total pressure gauge 18 and an intermediate pressure gauge 17 are arranged on the connecting pipeline, and a regulating valve is arranged on the pipeline between the total pressure gauge 18 and the intermediate pressure gauge 17.

[0043] The total pressure gauge 18 and the intermediate pressure gauge 17 are arranged in a lower mounting frame on one side of the bottom plate 16 .

[0044] Specifically, the structure of the air outlet top seat includes a floating sleeve 11, which is provided with an upper mounting groove for positioning the upper core head 19, the inlet of the central air outlet is located at the bottom of the upper mounting groove, and the bottom of the floating sleeve 11 fixes the upper sealing gasket 13 to the outer periphery of the upper core head 19 through the upper pressure ring 12. The upper sealing gasket 13 prevents air leakage from the connection between the outlet of the air outlet channel 191 and the inlet of the central air outlet, thereby reducing the air pressure.

[0045] Specifically, the bottom end surface extends out of the lower surface of the upper sealing gasket 13 .

[0046] Specifically, the structure of the air intake base includes a guide pressure plate 8, on which a lower mounting groove for positioning the lower core head 5 is provided, the outlet of the central air intake passage is located at the bottom surface of the lower mounting groove, and the top of the guide pressure plate 8 fixes the lower sealing gasket 7 to the outer periphery of the lower core head 5 through the lower pressure ring 6. The lower sealing gasket 7 prevents air leakage at the connection point between the outlet of the central air intake passage and the inlet of the air intake passage 51 of the lower core head 5, thereby reducing the air pressure in the air intake passage 51 of the lower core head 5.

[0047] Specifically, the top end surface extends out of the upper surface of the lower sealing gasket 7 .

[0048] Specifically, the linear drive member 1 is a hydraulic cylinder or a pneumatic cylinder.

[0049] The universal riser tube leak detection tool of this embodiment has the following working process:

[0050] First, pull out the second ends of the screw rods 46 of the upper and lower positioning units 4 from the clearance grooves 441 of the second connecting rod 44, and rotate the second connecting rod 44. Figure 5 The test riser pipe 14 (φ130x890 model) is placed in two positioning units 4, so that one side of the circumferential outer wall of the test riser pipe 14 is attached to the deepest groove of the V-shaped block 43, and the test riser pipe 14 is sleeved on the lower core head 5, with the bottom surface close to the lower sealing gasket 7, so that the outlet of the air inlet channel 51 is connected to the inner cavity of the test riser pipe 14, and the preliminary centering is completed;

[0051] Secondly, the second connecting rods 44 of the two positioning units 4 are rotated respectively, so that the straight block 45 is pressed against the rising tube 14 to be tested from the other side to press it into the deepest part of the groove of the V-shaped block 43, and then the screw pull rod 46 is tightened to complete the secondary centering. The coaxiality between the axis of the rising tube 14 to be tested and the connecting line of the upper and lower core heads can be ensured by the self-centering effect of the upper and lower V-shaped blocks 43 and the straight block 45, thereby ensuring the verticality. At this time, the state is as follows: Figure 5 As shown;

[0052] Next, the linear drive member 1 is adjusted, the stabilizing plate 2 is moved downward, the upper sealing gasket 13 is pressed against the top end surface of the riser tube 14 to be tested, and the upper core head 19 is extended into the tube body of the riser tube 14 to be tested, so that the inlet of the air outlet channel 191 is connected with the inner cavity of the riser tube 14 to be tested. Due to the good verticality, the force between the two end surfaces of the riser tube 14 to be tested and the sealing gasket is uniform, and no gap will appear, thereby ensuring the airtightness of the openings at both ends;

[0053] Finally, the external air source is connected, and the compressed gas is filled into the test riser tube 14 from the outlet of the air inlet channel 51 of the lower core head 5. After the pressure is maintained for a period of time, the air pressure is detected by the upper pressure transmitter 9 to determine whether the test riser tube 14 is leaking.

[0054] The test is now complete.

[0055] For the φ158x940 and φ150x940 riser tubes, the corresponding test results can be obtained by the same steps as above. Among them, the self-centering can be achieved by the cooperation between the screw rod 46 and the second connecting rod 44 and the cooperation between the V-shaped block 43 and the straight-shaped block 45, which is suitable for riser tubes with different outer diameters. The linear drive 1 can be adjusted to be suitable for riser tubes with different heights, and the versatility is very strong.

[0056] Specifically, the pressure of the external gas source is read out by the total pressure gauge 18, and the gas pressure filled into the test riser pipe 14 is read out by the intermediate pressure gauge 17. The gas pressure filled into the test riser pipe 14 can be adjusted by the regulating valve between the two pressure gauges to achieve testing under different gas pressures.

[0057] Those skilled in the art can understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A universal riser tube leak detection tool, characterized in that: It includes a supporting component, a pressing component and a positioning component; The support assembly comprises a bottom plate (16) on which an air intake base is arranged, a lower core head (5) is arranged on the upper part of the central air intake passage of the air intake base, an air intake passage (51) is arranged in the lower core head (5), an inlet of the air intake passage (51) is communicated with an outlet of the central air intake passage, the outlet of the air intake passage (51) is located at the top end surface of the lower core head (5), and a lower sealing gasket (7) is arranged in the air intake base; The pressing down assembly is located below the supporting assembly. The structure of the pressing down assembly includes a top plate (15), which is arranged in parallel with the bottom plate (16), and a guide column (3) is connected between the two in the vertical direction. A linear driving member (1) is provided on the top plate (15), and an output end of the linear driving member (1) is connected to a stabilizing plate (2) arranged in parallel with the top plate (15), which is movably assembled on the guide column (3) through a guide sleeve. An air outlet top seat is provided at the bottom of the stabilizing plate (2). An upper core head (19) coaxially arranged with the lower core head (5) is provided at the lower part of the central air outlet of the air outlet top seat. An air outlet channel (191) is provided in the upper core head (19). The outlet of the air outlet channel (191) is connected to the inlet of the central air outlet. The inlet of the air outlet channel (191) is located at the bottom end surface of the upper core head (19). An upper sealing gasket (13) is provided in the air outlet top seat. The positioning assembly comprises two positioning units (4) spaced apart from each other at an upper and a lower position. The two positioning units (4) have the same structure and are respectively fixed on the guide column (3) between the upper core head (19) and the lower core head (5). The two positioning units (4) are used to provide two groups of positioning points distributed along the axial direction for the test piece, so that the test piece and the axis of the upper core head (19) and the lower core head (5) are kept coaxial, thereby ensuring verticality.

2. The universal riser tube leak detection tool according to claim 1, characterized in that: The guide pillars (3) include two groups arranged at intervals, each group includes two guide pillars arranged at intervals, and the structure of the positioning unit (4) is as follows: it includes a fixed block (41), the fixed block (41) is fixedly sleeved on one group of guide pillars (3), one end of the fixed block (41) is fixedly connected to one end of a first connecting rod (42), a V-shaped block (43) is provided on the inner side of the first connecting rod (42), and the other end of the first connecting rod (42) is rotatably connected to the first end of a screw pull rod (46); The other end of the fixed block (41) is rotatably connected to one end of the second connecting rod (44), and an I-shaped block (45) is provided on the inner side of the second connecting rod (44). The other end of the second connecting rod (44) is used to cooperate and lock with the second end of the screw rod (46), so as to fix the test piece between the V-shaped block (43) and the I-shaped block (45).

3. The universal riser tube leak detection tool according to claim 2, characterized in that: The second end of the screw rod (46) is provided with a limiting column (462), and the other end of the second connecting rod (44) is provided with a clearance groove (441), which is used to vertically position it through the screw rod (46), and the outer side surface of the second connecting rod (44) is provided with a limiting groove (442) matching the contour of the limiting column (462) near the clearance groove (441).

4. The universal riser tube leak detection tool according to claim 3, characterized in that: The screw pull rod (46) is provided with a handle (463) on the outer side of the limiting column (462).

5. The universal riser tube leak detection tool according to claim 1, characterized in that: A pressure transmitter (9) is provided on one side of the stabilizing plate (2), the inlet of which is connected to the air outlet on the air outlet top seat through a conduit (10), and the air outlet on the air outlet top seat is connected to the outlet of the air outlet channel (191) of the upper core head (19).

6. The universal riser tube leak detection tool according to claim 1, characterized in that: The inlet of the central air inlet is connected to an external air source, and a total pressure gauge (18) and an intermediate pressure gauge (17) are arranged on the connecting pipeline, and a regulating valve is arranged on the pipeline between the total pressure gauge (18) and the intermediate pressure gauge (17).

7. The universal riser tube leak detection tool according to claim 1, characterized in that: The structure of the air intake base includes a guide pressure plate (8) on which a lower mounting groove for positioning the lower core head (5) is provided. The outlet of the central air intake passage is located at the bottom surface of the lower mounting groove. The top of the guide pressure plate (8) fixes the lower sealing gasket (7) to the outer periphery of the lower core head (5) through a lower pressure ring (6).

8. The universal riser tube leak detection tool according to claim 1, characterized in that: The structure of the air outlet top seat comprises a floating sleeve (11) on which an upper mounting groove for positioning an upper core head (19) is provided, the inlet of the central air outlet is located at the bottom surface of the upper mounting groove, and the bottom of the floating sleeve (11) fixes the upper sealing gasket (13) to the outer periphery of the upper core head (19) through an upper pressure ring (12).

9. The universal riser tube leak detection tool according to claim 1, characterized in that: The top end surface extends out of the upper surface of the lower sealing pad (7).

10. The universal riser tube leak detection tool according to claim 1, characterized in that: The bottom end surface extends out of the lower surface of the upper sealing gasket (13).

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