Connecting device for cast pipe detection device

Abstract

The utility model relates to the technical field of cast pipe detection, in particular to a connecting device for a cast pipe detection device, which comprises a base, an upper connecting piece is arranged on the base, the upper connecting piece extends along the axial direction of a cast pipe to be detected, two opposite ends of the upper connecting piece respectively extend out of two opposite ends of the base, and upper movable rods are hinged to the two opposite ends of the upper connecting piece. Lower movable rods are hinged to the ends, back on to the upper connecting pieces, of the upper movable rods, and a lower connecting piece used for being fixedly connected with a detection trolley is hinged between the two lower movable rods. The base is further connected with a supporting piece parallel to the upper connecting piece, the length of the supporting piece is larger than that of the lower connecting piece, and the upper movable rod makes contact with the supporting piece under the action of self-gravity. The included angle between the upper movable rod and the lower movable rod changes to resist bumping of the detection trolley caused by unevenness of the outer surface of the cast pipe, and the measurement result is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe body detection devices, and particularly to a connecting device for a cast pipe detection device. Background Art

[0002] Ductile iron pipes (cast pipes) have superior corrosion resistance and strength, can withstand high water transmission pressure, soil pressure and ground load, are safe and reliable, and are widely used in oil pipelines, water pipelines and gas pipelines. Among them, the wall thickness measurement of ductile iron pipes is the core detection process of cast pipes. If the wall thickness is uneven or locally too thin, it is easy to cause a decrease in the local bearing capacity and prone to pipeline bursting accidents.

[0003] At present, the cast pipe detection device for detecting the wall thickness of cast pipes includes a gantry bracket, a lifting mechanism and a detection trolley. The wall thickness measurement of cast pipes is completed by the detection trolley running on the outer wall of the cast pipe. The detection trolley and the lifting mechanism are connected by a connecting device. The lifting mechanism is used to drive the detection trolley to descend so that the detection trolley can contact the outer wall of the cast pipe. Of course, the lifting mechanism is slidably arranged along the axial direction of the cast pipe on the cross beam of the gantry bracket, and is driven by a driving mechanism arranged on the cross beam to slide along the axial direction of the cast pipe. For example, a detection device and a wall thickness measuring machine disclosed in a Chinese patent (publication number: CN213714244U). During detection, the lifting mechanism drives the vehicle body of the detection trolley to descend, so that the rollers of the trolley contact the outer wall of the cast pipe, and then the driving mechanism drives the vehicle body and the lifting mechanism to move along the axial direction of the cast pipe. During this process, the wall thickness of the cast pipe is detected by an electromagnetic ultrasonic probe.

[0004] However, due to the technological characteristics of the cast pipe surface, there are a large number of uneven points on its outer cylindrical surface, that is, there are large dense dot-like protrusions or curved curves on the outer surface of the cast pipe. When the rollers of the above-mentioned existing detection trolley move along the axial direction of the cast pipe on the outer surface of the cast pipe, the detection trolley cannot adapt to the complex spatial curved surface on the outer wall of the detected pipe in real time, resulting in large bumps of the detection trolley and affecting the measurement result of the wall thickness of the cast pipe. Summary of the Utility Model

[0005] One of the main purposes of the present utility model is to provide a connecting device for a cast pipe detection mechanism, which aims to solve the technical problem that when the rollers of the detection trolley for detecting the wall thickness of cast pipes move along the axial direction of the cast pipe on the outer surface of the cast pipe, the detection trolley cannot adapt to the complex spatial curved surface on the outer wall of the detected pipe in real time, resulting in large bumps of the detection trolley and affecting the measurement result.

[0006] To achieve the above object, the present utility model provides a connecting device for a cast pipe detection device, which includes a base for connecting with a lifting mechanism of the cast pipe detection device. An upper connecting member is provided on the base, and the upper connecting member extends along the axial direction of the cast pipe to be detected. The opposite ends of the upper connecting member respectively extend out of the opposite ends of the base. The opposite ends of the upper connecting member are hinged with upper movable rods. One end of the upper movable rod facing away from the upper connecting member is hinged with a lower movable rod. A lower connecting member is hinged between the two lower movable rods. The space formed by the hinged connection between the upper connecting member, the upper movable rods, the lower movable rods and the lower connecting member can be changed into a rhombus. The lower connecting member is used for connecting and fixing with a detection trolley of the cast pipe detection mechanism; a support member parallel to the upper connecting member and located in the space is also connected to the base. The length of the support member is greater than the length of the lower connecting member. The two upper movable rods respectively contact the opposite ends of the support member under the action of their own gravity, and the support member maintains the rhombus formed by the hinged connection between the upper connecting member, the upper movable rods, the lower movable rods and the lower connecting member unchanged.

[0007] Further, elastic buffer portions are provided at the opposite ends of the support member. The elastic buffer portions are arranged at an angle with the support member, and the included angle between the elastic buffer portions and the support member is an obtuse angle.

[0008] Further, the support member is connected to the base through a connecting rod; wherein, the connecting rod extends in the vertical direction, and the opposite ends of the connecting rod are respectively connected to the upper connecting member and the support member.

[0009] Further, a vertical first threaded hole is formed in the upper connecting member, and a vertical second threaded hole is formed in the support member. One end of the connecting rod passes through the base and is threadedly connected with the first threaded hole, and the connecting rod is locked with the connecting member through a first locking member. The other end of the connecting rod is threadedly connected with the second threaded hole, and the connecting rod is locked with the support member through a second locking member.

[0010] Further, a vertical sleeve is fixed on the support member. The sleeve penetrates through the opposite surfaces of the support member, and a linear guide rod fixed to the lower connecting member is slidably sleeved in the sleeve.

[0011] Further, the distance between the support member and the base is greater than the height of the linear guide rod.

[0012] Further, a vertical avoidance hole is formed in the base. The avoidance hole is opposite to the linear guide rod to prevent the linear guide rod from interfering with the base during the rising process.

[0013] Further, the relative two ends of the base along the axial direction of the cast pipe are hollow bases with open ends. The upper connecting member is arranged inside the base, and the relative two ends of the upper connecting member respectively extend outside the two open ends.

[0014] Further, the upper connecting member is placed inside the base. Adjusting members are provided on the relative two sides of the base along the horizontal direction perpendicular to the cast pipe. The adjusting members are threadedly connected to the base, and the adjusting members are used to adjust the displacement of the upper connecting member in the horizontal direction perpendicular to the cast pipe.

[0015] Further, positioning grooves are formed at the relative two ends of the upper surface of the upper connecting member. The two positioning grooves are symmetrical about the adjusting member. The positioning grooves extend along the horizontal direction perpendicular to the cast pipe. Guide pressure rods are threadedly connected to the relative two side walls of the base along the horizontal direction perpendicular to the cast pipe. The guide pressure rods are opposite to the positioning grooves, and the two guide pressure rods respectively press against the two positioning grooves.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] When the connecting device for the cast pipe detection device of the present utility model is in use, the lower connecting member is connected and fixed to the detection trolley of the cast pipe detection mechanism. At the same time, the base is connected to the lifting mechanism of the cast pipe detection device. When the lifting mechanism drives the base to descend and the rollers of the detection trolley just contact the outer surface of the cast pipe, at this time, the relative two ends of the support member just contact the two upper movable rods respectively. When the lifting mechanism continues to descend and the detection trolley is in interference fit with the outer surface of the cast pipe, the included angle between the upper movable rod and the lower movable rod decreases, causing the support member to separate from the upper movable rod. At this time, the rhombus shape formed by the upper connecting member, the upper movable rod, the lower movable rod, and the lower connecting member changes; in the state where the detection trolley is in interference fit with the outer surface of the cast pipe, the driving mechanism of the cast pipe detection device drives the lifting mechanism to move along the axial direction of the cast pipe on the cross beam of the gantry bracket, and the detection trolley follows. The rollers of the detection trolley move along the axial direction of the cast pipe on the outer surface of the cast pipe. If the outer surface of the cast pipe is uneven or bent, the included angle between the upper movable rod and the lower movable rod changes. The change in the included angle between the upper movable rod and the lower movable rod resists the bumps caused by the uneven outer surface of the cast pipe for the detection trolley. At the same time, the detection trolley will quickly respond and reset to closely fit the outer surface of the cast pipe under its own gravity, enabling the detection trolley to adapt to the complex spatial curved surface on the outer wall of the pipe to be detected in real time and improving the result of measuring the wall thickness of the cast pipe by the detection trolley. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the connecting device for the cast pipe detection device of the present utility model;

[0019] Figure 2 The figure for the embodiment is a schematic structural view of the connection device, the lifting mechanism and the gantry bracket;

[0020] Figure 3 The figure for the embodiment is a sectional structural view of the connection device for the cast pipe inspection device;

[0021] Figure 4 The figure for the embodiment is a top view of the connection device for the cast pipe inspection device;

[0022] Figure 5 The figure for the embodiment is a sectional structural view of the upper connection member.

[0023] Reference numerals in each figure:

[0024] 1, base; 10, adjusting member; 2, upper connection member; 20, positioning groove; 201, guiding pressure rod; 202, first threaded hole; 3, upper movable rod; 4, lower movable rod; 5, lower connection member; 50, linear guide rod; 501, bushing; 6, support member; 60, connecting rod; 61, first locking member; 62, second locking member; 63, elastic buffer portion; 64, second threaded hole; 7, gantry bracket; 70, cross beam; 71, lifting mechanism; 72, driving mechanism; 8, inspection trolley; 9, cast pipe. Specific embodiments

[0025] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "width", "upper", "lower", "front", "rear", "top", "bottom", 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 thus should not be construed as a limitation of the present invention.

[0027] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "set" 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, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between 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.

[0028] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include contact between the first and second features through additional features that are not in direct contact. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0029] Please refer to Figure 1 - Figure 5 , the present utility model provides a connecting device for a cast pipe detection device, including a base 1, an upper connecting member 2, an upper movable rod 3, a lower movable rod 4, a lower connecting member 5, and a support member 6.

[0030] Refer to Figure 1 and Figure 2 , the two opposite ends of the base 1 along the axial direction of the cast pipe 9 to be detected are hollow bases 1 with open ends. As Figure 2 shown, the base 1 is used to connect with the lifting mechanism 71 of the cast pipe 9 detection device.

[0031] The upper connecting member 2 is arranged on the base 1 and extends along the axial direction of the cast pipe 9 to be detected. The two opposite ends of the upper connecting member 2 respectively extend out of the two opposite ends of the base 1. Specifically, refer to Figure 1 and Figure 3 shown, the upper connecting member 2 is arranged inside the base 1, and the two opposite ends of the upper connecting member 2 respectively extend out of the two open ends of the base 1.

[0032] Refer to Figure 1 , the two opposite ends of the upper connecting member 2 are hinged with upper movable rods 3, and the ends of the upper movable rods 3 facing away from the upper connecting member 2 are hinged with the lower movable rods 4. Specifically, it can be understood that there are two upper movable rods 3 and two lower movable rods 4. The two upper movable rods 3 are centrosymmetric about the center of the upper connecting member 2, and the two lower movable rods 4 are centrosymmetric about the center of the upper connecting member 2. A lower connecting member 5 is hinged between the two lower movable rods 4, that is, the two opposite ends of the lower connecting member 5 are respectively hinged with the two lower movable rods 4. Among them, the lower connecting member 5 is used to connect and fix with the detection trolley 8 of the cast pipe detection device. The space formed by the hinging between the upper connecting member 2, the upper movable rods 3, the lower movable rods 4, and the lower connecting member 5 can change into a rhombus. When the detection trolley 8 is not in contact with the outer surface of the cast pipe 9, under the action of the gravity of the detection trolley 8, the space formed by the hinging between the upper connecting member 2, the upper movable rods 3, the lower movable rods 4, and the lower connecting member 5 is a rectangle.

[0033] In the process of the lifting mechanism 71 driving the inspection trolley 8 to descend until it contacts the outer surface of the cast iron pipe 9, in order to make the space formed by the hinged connection between the upper connecting member 2, the upper movable rod 3, the lower movable rod 4 and the lower connecting member 5 become a rhombus, a support member 6 needs to be arranged in the space formed by the hinged connection between the upper connecting member 2, the upper movable rod 3, the lower movable rod 4 and the lower connecting member 5. Specifically, referring to Figure 1 or Figure 3 , there is a spacing between the support member 6 and the base 1. The support member 6 is connected to the base 1 through a connecting rod 60. The connecting rod 60 extends in the vertical direction. One end of the connecting rod 60 is connected to the base 1 or passes through the base 1 and is connected to the upper connecting member 2. The other end of the connecting rod 60 is connected to the support member 6. In addition, the support member 6 is parallel to the upper connecting member 2. The length of the support member 6 is greater than the length of the lower connecting member 5. The included angle between the upper movable rod 3 and the lower movable rod 4 is an acute angle. The two upper movable rods 3 respectively contact the opposite ends of the support member 6 under the action of their respective gravities. In this way, the rhombus formed by the hinged connection between the upper connecting member 2, the upper movable rod 3, the lower movable rod 4 and the lower connecting member 5 can be maintained by the support member 6.

[0034] Exemplarily, two connecting rods 60 are provided, so that the stability performance of the support member 6 can be improved. Of course, in other embodiments, three or four connecting rods 60 can also be provided, which is not limited herein.

[0035] It should be noted that without the support of the support member 6, the space formed by the hinged connection between the upper connecting member 2, the upper movable rod 3, the lower movable rod 4 and the lower connecting member 5 can be a figure of any shape.

[0036] In summary, referring to Figure 1 and Figure 2, when the connecting device of the cast pipe 9 detection device of the present utility model is in use, the lower connecting member 5 is fixedly connected to the detection trolley 8 of the cast pipe detection device, and at the same time, the base 1 is connected to the lifting mechanism 71 of the cast pipe 9 detection device. When the lifting mechanism 71 drives the base 1 to descend so that the rollers of the detection trolley 8 just contact the outer surface of the cast pipe 9, at this time, the relative two ends of the support member 6 just contact the two upper movable rods 3 respectively. When the lifting mechanism 71 continues to descend and the detection trolley 8 is in interference fit with the outer surface of the cast pipe 9, the angle between the upper movable rod 3 and the lower movable rod 4 decreases, causing the support member 6 to separate from the upper movable rod 3. At this time, the rhombus shape formed by the upper connecting member 2, the upper movable rod 3, the lower movable rod 4, and the lower connecting member 5 changes; in the state where the detection trolley 8 is in interference fit with the outer surface of the cast pipe 9, the driving mechanism 72 of the cast pipe 9 detection device drives the lifting mechanism 71 to move along the axis direction of the cast pipe 9 on the cross beam 70 of the gantry bracket 7, and the detection trolley 8 follows, so that the rollers of the detection trolley 8 move along the axis direction of the cast pipe 9 on the outer surface of the cast pipe 9. When encountering unevenness or bending on the outer surface of the cast pipe 9, the angle between the upper movable rod 3 and the lower movable rod 4 changes, and the change in the angle between the upper movable rod 3 and the lower movable rod 4 resists the bumps of the detection trolley 8 caused by the uneven outer surface of the cast pipe 9. At the same time, the detection trolley 8 will quickly respond and reset to closely fit the outer surface of the cast pipe 9 under its own gravity, enabling the detection trolley 8 to adapt to the complex spatial curved surface on the outer wall of the pipeline to be detected in real time, and improving the result of measuring the wall thickness of the cast pipe 9 by the detection trolley 8.

[0037] It should be noted that the driving mechanism 72 of the cast pipe 9 detection device selects an existing driving structure, and the lifting mechanism 71 also selects an existing lifting structure, such as the driving mechanism 72 and the lifting mechanism 71 involved in a detection device and a wall thickness measuring machine disclosed in an existing patent (publication number: CN213714244U), which will not be elaborated here. In addition, how the detection trolley 8 detects the wall thickness of the cast pipe 9 belongs to the commonly used existing technology in the field of wall thickness detection of the cast pipe 9, and will not be described here.

[0038] In an embodiment, in order to be able to adjust the height of the support member 6, so as to be able to adjust the size of the rhombus formed by the hinged connection between the upper connecting member 2, the upper movable rod 3, the lower movable rod 4, and the lower connecting member 5 according to the actual working conditions, the support member 6 is vertically adjustably arranged on the connecting rod 60. Specifically, refer to Figure 3, a vertical first threaded hole 202 is formed in the upper connecting member 2, and a vertical second threaded hole 64 is formed in the support member 6. One end of the connecting rod 60 passes through the base 1 and is threadedly connected to the first threaded hole 202, and the connecting rod 60 is locked to the upper connecting member 2 by a first locking member 61. The other end of the connecting rod 60 is threadedly connected to the second threaded hole 64, and the connecting rod 60 is locked to the support member 6 by a second locking member 62. It can be understood that the connecting rod 60 and the upper connecting member 2 are in a locked state, the first locking member 61 is at the top of the upper connecting member 2, the support member 6 and the connecting rod 60 are in a locked state, and the second locking member 62 is at the bottom of the support member 6. When it is necessary to adjust the height of the support member 6, the first locking member 61 and / or the second locking member 62 can be loosened, and the support member 6 can be manually adjusted to the required height, and then the connecting rod 60 is locked to the upper connecting member 2 by the first locking member 61 and / or the support member 6 is locked to the connecting rod 60 by the second locking member 62.

[0039] In one embodiment, the first locking member 61 is a first locking nut, and the second locking member 62 is a second locking nut. The first locking nut and the second locking nut are respectively threadedly connected and locked to the threads at the opposite ends of the connecting rod 60. In other embodiments, the first locking member 61 and the second locking member 62 can also be pins. By forming through holes on the outer walls of the opposite ends of the connecting rod 60, and then inserting the pins into the through holes, the same effect of locking the connecting rod 60 to the support member 6 and the upper connecting member 2 respectively can be achieved. Therefore, for those skilled in the art, by reasonably changing the locking structure between the connecting rod 60 and the support member 6 and the locking structure between the connecting rod 60 and the upper connecting member 2, it should also fall within the protection scope of the present invention.

[0040] In one embodiment, referring to Figure 1 or Figure 3 , elastic buffer portions 63 are provided at the opposite ends of the support member 6, and the elastic buffer portions 63 are made of rubber material. Specifically, the elastic buffer portions 63 can be fixed to the support member 6 by screws. The elastic buffer portions 63 are arranged at an angle with the support member 6, and the included angle between the elastic buffer portions 63 and the support member 6 is an obtuse angle. The elastic buffer portions 63 can prevent the upper movable rod 3 from directly contacting the support member 6 rigidly, and improve the service life of the connecting device of the present invention.

[0041] In one embodiment, referring to Figure 1 or Figure 3, a vertical bushing 501 is fixed on the support member 6. The bushing 501 penetrates the opposite surfaces of the support member 6. A linear guide rod 50 fixed to the lower connecting member 5 is slidably sleeved inside the bushing 501. Specifically, one end of the linear guide rod 50 is fixed to the surface of the lower connecting portion facing the support member 6. The linear guide rod 50 can be fixed to the support member 6 by screws. The other end of the linear guide rod 50 is slidably connected to the bushing 501, and the linear guide rod 50 extends out of the bushing 501. Of course, the gap between the support member 6 and the base 1 is greater than the height of the linear guide rod 50. When the inspection trolley 8 bounces during movement due to uneven positions on the outer surface of the cast pipe 9, the linear guide rod 50 will vertically rise and fall along the bushing 501. At the same time, the linear guide rod 50 itself also has a gravity clamping force on the inspection trolley 8, improving the degree of fit between the inspection trolley 8 and the outer surface of the cast pipe 9 during movement.

[0042] It should be noted that the gap between the support member 6 and the base 1 is greater than the height of the linear guide rod 50 to prevent interference between the linear guide rod 50 and the base 1 during the rising process.

[0043] Of course, in other embodiments, a vertical avoidance hole can also be provided on the base 1. The avoidance hole is directly opposite to the linear guide rod 50 and is used to prevent interference between the linear guide rod 50 and the base 1 during the rising process. That is to say, it can be understood that there are through holes on the upper connecting member 2 and the base 1 that allow the linear guide rod 50 to pass through.

[0044] In this embodiment, multiple linear guide rods 50 are provided. In this embodiment, two or more linear guide rods 50 are provided, so as to improve the stability of the up and down movement of the lower connecting member 5.

[0045] In one embodiment, referring to Figure 2 and Figure 3 , the upper connecting member 2 is placed inside the base 1. Adjusting members 10 are provided on the opposite two sides of the base 1 along the horizontal direction perpendicular to the cast pipe 9. The adjusting members 10 extend along the horizontal direction perpendicular to the cast pipe 9. The adjusting members 10 are threadedly connected to the base 1 and are used to adjust the displacement of the upper connecting member 2 in the horizontal direction perpendicular to the cast pipe 9. Specifically, it can be understood that the upper connecting member 2 placed inside the base 1 is locked to the base 1 through the adjusting members 10. The adjusting members 10 are adjusting bolts. The adjusting bolts pass through the base 1 and abut against the side surface of the upper connecting member 2. By adjusting the adjusting bolts, the displacement of the upper connecting member 2 in the horizontal direction perpendicular to the cast pipe 9 can be adjusted, thereby horizontally micro-adjusting the spatial position of the overall diamond structure, so that the diamond structure formed by the hinged connection between the upper connecting member 2, the upper movable rod 3, the lower movable rod 4, and the lower connecting member 5 adapts to the horizontal axis position of the cast pipe 9, so that the inspection trolley 8 can adapt to the horizontal axis position of the cast pipe 9 to adapt to the inspection of cast pipes 9 with different diameters.

[0046] In one embodiment, referring toFigure 3 and Figure 4 , positioning grooves 20 are formed at opposite ends of the upper surface of the upper connecting member 2. The two positioning grooves 20 are symmetric with respect to the adjusting member 10. The positioning grooves 20 extend along a horizontal direction perpendicular to the cast pipe 9. Guide pressure rods 201 are threadedly connected to opposite side walls of the base 1 along a horizontal direction perpendicular to the cast pipe 9. The guide pressure rods 201 face the positioning grooves 20, and the two guide pressure rods 201 respectively press against the two positioning grooves 20. Specifically, it can be understood that opposite ends of the guide pressure rod 201 are respectively connected to the base 1, and the guide pressure rod 201 is adapted to the positioning groove 20. The cooperation between the positioning groove 20 and the guide pressure rod 201 can limit the movement of the upper connecting member 2 in the vertical direction and at the same time limit the lateral displacement of the upper connecting member 2. Exemplarily, the number of the guide pressure rods 201 is two, but not limited to two, which further avoids the jumping of the upper connecting member 2. Of course, in other embodiments, the above-mentioned guide pressure rod 201 can also vertically penetrate into the interior of the upper connecting member 2 to play a fixing role.

[0047] In one embodiment, in order to improve the stability performance of the connecting device, referring to Figure 4 , the upper connecting member 2 is a plate-like structure. Two upper movable rods 3 are hinged to one end of the upper connecting member 2 extending outside the base 1, and two upper movable rods 3 are also hinged to the other end of the upper connecting member 2 extending outside the base 1. Then the number of the upper movable rods 3 is four.

[0048] Since a lower movable rod 4 is hinged to one end of each upper movable rod 3 facing away from the upper connecting member 2, the number of the lower movable rods 4 is also four. A lower connecting member 5 is hinged between two of the lower movable rods 4 along the axial direction of the cast pipe 9. Then the number of the lower connecting members 5 is two. Among them, opposite sides of the inspection trolley 8 along a horizontal direction perpendicular to the axial direction of the cast pipe 9 are respectively connected and fixed to the two lower connecting members 5. In this way, the stability of the connecting device can be improved, so that the diamond structure formed by hinging the upper connecting member 2, the upper movable rods 3, the lower movable rods 4 and the lower connecting members 5 has a good lateral torsional resistance effect.

[0049] In summary, the connecting device for the cast pipe 9 detection device of the present utility model has the following beneficial effects:

[0050] 1. During the specific operation process, the lifting mechanism 71 descends. After the detection trolley 8 contacts the outer surface of the cast pipe 9, it continues to descend by 10 mm to 50 mm, so that an interference fit is generated between the rollers of the detection trolley and the outer surface of the cast pipe 9. At this time, the rhombus structure formed by the hinge connection between the upper connecting member 2, the upper movable rod 3, the lower movable rod 4 and the lower connecting member 5 will deform, and the included angle between the upper movable rod 3 and the lower movable rod 4 will decrease. However, the position of the trolley will be limited to the outer surface of the cast pipe 9 and there will be no lateral displacement. The synchronous lifting mechanism 71 moves along the axial direction of the cast pipe 9 on the cross beam 70 of the bracket. When encountering unevenness, the change in the included angle between the movable rods can resist the bumps caused by the unevenness. At the same time, the detection trolley 8 will quickly respond under its own gravity and return to be closely attached to the outer surface of the cast pipe 9 to maintain the detection accuracy and stability of the detection trolley 8.

[0051] 2. The displacement of the upper connecting member 2 in the horizontal direction perpendicular to the cast pipe 9 can be adjusted to achieve the effect of laterally micro-adjusting the spatial position of the overall rhombus structure, so that the rhombus structure formed by the hinge connection between the upper connecting member 2, the upper movable rod 3, the lower movable rod 4 and the lower connecting member 5 can adapt to the horizontal axis position of the cast pipe 9, thereby enabling the detection trolley 8 to adapt to the horizontal axis position of the cast pipe 9 to adapt to the detection of cast pipes 9 with different diameters.

[0052] 3. The elastic buffer part 63 can prevent the upper movable rod 3 from directly contacting the support member 6 hard, and improve the service life of the connecting device for the cast pipe 9 detection device of the present invention.

[0053] 4. The linear guide rod 50 improves the overall torsional strength of the connecting device, thereby improving the stability of the connecting device.

[0054] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A connecting device for a cast pipe inspection device, comprising a base for connecting to a lifting mechanism of the cast pipe inspection device, characterized in that: An upper connecting piece is provided on the base, and the upper connecting piece extends along the axial direction of the cast pipe to be inspected, and the opposite ends of the upper connecting piece extend out of the opposite ends of the base respectively, and the opposite ends of the upper connecting piece are hinged with upper movable rods, and one end of the upper movable rod facing away from the upper connecting piece is hinged with a lower movable rod, and a lower connecting piece is hinged between the two lower movable rods, and the space formed by the hinges between the upper connecting piece, the upper movable rod, the lower movable rod and the lower connecting piece can be changed into a rhombus, and the lower connecting piece is used to be connected and fixed with the inspection trolley of the cast pipe inspection mechanism; The base is also connected to a support member located in the space and parallel to the upper connecting member. The length of the support member is greater than the length of the lower connecting member. The two upper movable rods are in contact with the opposite ends of the support member respectively under the action of their respective gravity. The support member maintains the rhombus formed by the hinges between the upper connecting member, the upper movable rod, the lower movable rod and the lower connecting member unchanged.

2. The connection device for a cast pipe inspection device according to claim 1, characterized in that: Elastic buffer parts are arranged at opposite ends of the support member, the elastic buffer parts are arranged at an angle with the support member, and the angle between the elastic buffer parts and the support member is an obtuse angle.

3. The connection device for a cast pipe inspection device according to claim 1, characterized in that: The support member is connected to the base via a connecting rod, wherein the connecting rod extends in a vertical direction, and opposite ends of the connecting rod are respectively connected to the upper connecting member and the support member.

4. The connection device for a cast pipe inspection device according to claim 3, characterized in that: A first vertical threaded hole is provided on the upper connecting member, and a second vertical threaded hole is provided on the supporting member. One end of the connecting rod is passed through the base and is threadedly connected to the first threaded hole, and the connecting rod and the connecting member are locked by a first locking member. The other end of the connecting rod is threadedly connected to the second threaded hole, and the connecting rod and the supporting member are locked by a second locking member.

5. The connection device for a cast pipe inspection device according to claim 1, characterized in that: A vertical shaft sleeve is fixed on the support member, and the shaft sleeve passes through the relative surface of the support member. A sliding sleeve inside the shaft sleeve is provided with a linear guide rod fixed to the lower connecting member.

6. The connection device for a cast pipe inspection device according to claim 5, characterized in that: The distance between the support member and the base is greater than the height of the linear guide rod.

7. The connection device for a cast pipe inspection device according to claim 5, characterized in that: A vertical avoidance hole is provided on the base, the avoidance hole is directly opposite to the linear guide rod, and the avoidance hole is used to prevent the linear guide rod from interfering with the base during the rising process.

8. The connection device for a cast pipe inspection device according to claim 1, characterized in that: The base is a hollow base with open ends at two opposite ends along the axial direction of the casting pipe. The upper connecting piece is arranged in the base, and the opposite ends of the upper connecting piece extend to the outside of the two open ends respectively.

9. The connection device for a cast pipe inspection device according to claim 8, characterized in that: The upper connecting member is placed in the base, and the base is provided with adjusting members on opposite sides along a horizontal direction perpendicular to the casting pipe. The adjusting members are threadedly connected to the base, and the adjusting members are used to adjust the displacement of the upper connecting member in a horizontal direction perpendicular to the casting pipe.

10. The connection device for a cast pipe inspection device according to claim 9, characterized in that: Positioning grooves are provided at opposite ends of the upper surface of the upper connecting member, and the two positioning grooves are symmetrical about the adjusting member. The positioning grooves extend along a horizontal direction perpendicular to the casting pipe. The base is threadedly connected with guide pressure rods along opposite side walls perpendicular to the horizontal direction of the casting pipe. The guide pressure rods are opposite to the positioning grooves, and the two guide pressure rods are respectively pressed against the two positioning grooves.

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