Small-diameter pipeline inner wall automatic detection device

Abstract

The utility model relates to a kind of small-diameter pipeline inner wall automatic detection device, including mounting bracket and drive trolley, the both ends of mounting bracket are respectively provided with first support pipe and second support pipe, the pipe body of first support pipe and second support pipe is all provided with several righting arms with gyro wheel, first drive motor with output end and mounting bracket fixation is set in first support pipe, mounting bracket is provided with several probes or camera, cable connected with probe or camera is inserted into the inner cavity of one end of second support pipe after being passed through, drive trolley is fixed with second support pipe.The small-diameter pipeline inner wall automatic detection device of the utility model, overall radial dimension is smaller and cable is not easy to twist, suitable for the detection of smaller pipe diameter pipeline.

Description

Technical Field

[0001] This utility model relates to pipeline inspection devices, and more particularly to an automatic inspection device for the inner wall of small-diameter pipelines. Background Technology

[0002] Currently, pipeline inspection mainly includes two methods: external pipeline inspection and internal pipeline inspection. Among them, the method of inspecting the pipeline wall from the inside has higher sensitivity, detection rate and reliability for damage near the inner wall of the pipeline. Damage near the inner wall of the pipeline has a greater impact on the overall quality of the pipeline. Therefore, the method of inspecting pipelines from the inside is widely used in high-reliability pipeline inspection scenarios.

[0003] Existing methods for inspecting pipes from the inside are mainly used for inspecting the inner walls of large-diameter pipes. However, when inspecting small-diameter pipes, due to their smaller diameter, internal inspection requires either a manual inspection device with fewer probes, which is cumbersome and has poor inspection results. When using automated walking inspection devices, such as the pipe scanning device disclosed in Chinese Patent Publication No. CN222209544U, the overall radial dimension of the inspection device is relatively large because it includes a drive motor for the overall movement of the device, multiple probes for flaw detection, a video camera, and a centering device. Therefore, it can only be applied to the internal inspection of large pipes. At the same time, the cables connecting multiple probes and cameras run directly from the outside of the device and transmit data to the host computer. On the one hand, the multiple external cables further increase the overall external area of ​​the inspection device, making it difficult to apply to the internal inspection of small-diameter pipes. On the other hand, during inspection, the probes and their cables driven by the motor to rotate are prone to twisting when passing through the motor assembly. This reduces the reliability of the connection between the probes and cameras and the external equipment, and in severe cases, may even cause cable breakage, thus affecting the normal scanning of the pipe. Utility Model Content

[0004] To address the technical problems in existing technologies, such as the large overall radial dimension of the device, the easy tangling of the cables connecting the probe and camera due to direct external wiring, and the inability to be applied to the internal inspection of small-diameter pipes, this utility model provides an automatic inspection device for the inner wall of small-diameter pipes with a smaller overall radial dimension and less prone to cable tangling.

[0005] The present invention relates to an automatic detection device for the inner wall of small-diameter pipes, comprising a mounting frame and a drive trolley. The mounting frame is provided with a first support pipe and a second support pipe at its two ends respectively. The first support pipe and the second support pipe are each provided with a number of straightening arms with rollers. The first support pipe is provided with a first drive motor whose output end is fixed to the mounting frame. The mounting frame is provided with a number of probes or cameras. The cables connected to the probes or cameras pass through the inner cavity of the second support pipe from one end and exit from the other end. The drive trolley is fixed to the second support pipe.

[0006] The advantage of this automatic detection device for the inner wall of small-diameter pipes is that its probe or camera is set between the first support pipe and the second support pipe via a mounting bracket. The first support pipe and the second support pipe are in contact with the inner wall of the pipe via their upper straightening arms. The first drive motor that drives the mounting bracket to rotate is set inside the first support pipe. The cable connecting the probe or camera passes through the inner cavity of the second support pipe on the other side of the mounting bracket and is connected to the upstream equipment. The drive trolley is fixed to the pipe body of the second support pipe, thereby realizing the displacement drive of the mounting bracket and other components.

[0007] Compared to existing pipe inspection devices, this automatic pipe inner wall inspection device for small diameter pipes places the first drive motor that drives the mounting bracket to rotate inside the first support pipe, while the cables connected to several probes or cameras on the mounting bracket pass through the second support pipe on the other side. This not only separates the cables from the first drive motor, avoiding cable tangling when the mounting bracket rotates, but also further reduces the risk of cable tangling by transmitting the cables through the inner cavity of the pipe. In addition, the built-in cables also reduce the overall radial dimension of the device. Combined with the horizontal coaxial layout of the drive trolley, the first support pipe, the mounting bracket, and the second support pipe, it can be applied to small-diameter pipe inspection applications.

[0008] Furthermore, in the small-diameter pipe inner wall automatic detection device of this utility model, both the first support pipe and the second support pipe are provided with a straightening device. The straightening device includes two connecting rings sleeved on the pipe body, and a plurality of straightening arm assemblies are provided between the two connecting rings. The straightening arm assembly includes a straightening arm and a support arm that are hinged to each other. The ends of the straightening arm and the support arm are respectively hinged to the two connecting rings on the front and rear sides. The roller is provided at the end of the straightening arm.

[0009] The straightening device straightens the first and second support pipes so that the center of the device is basically aligned with the central axis of the pipe, which facilitates the probe and camera to perform a circumferential scan of the inner wall of the pipe.

[0010] Furthermore, in the small-diameter pipe inner wall automatic detection device of this utility model, one end of the straightening device is provided with a limit ring and the other end is provided with a locking assembly. The limit ring is located outside one of the connecting rings and is sleeved on the pipe body of the first support pipe or the second support pipe. The locking assembly includes a locking ring and a limiting wheel located on both sides of the other connecting ring. The locking ring and the limiting wheel are connected to the pipe body of the first support pipe or the second support pipe by threads.

[0011] The setting of the limiting ring enables axial limiting of one of the limiting rings, and the setting of the locking component enables axial locking of the other limiting ring and adjustment of the expansion angle of the straightening device to adapt it to pipes of different diameters.

[0012] Furthermore, in the automatic detection device for the inner wall of small-diameter pipes of this utility model, the locking assembly also includes a spring, which is disposed between the locking wheel and the connecting ring, with its two ends connected to the locking wheel and the connecting ring respectively.

[0013] The spring positioned between the locking wheel and the connecting ring allows the operator to adjust the axial position of the connecting ring simply by adjusting the position of the locking ring, thus facilitating quick adjustment of the expansion angle of the straightening device.

[0014] Furthermore, in the small-diameter pipe inner wall automatic detection device of this utility model, the mounting frame includes a mounting plate, and a positioning plate and a connecting frame are respectively provided at both ends of the mounting plate. The two ends of the mounting plate are fixed to the positioning plate and the connecting frame respectively. The connecting frame is fixed to the output end of the first drive motor. The positioning plate is connected to the pipe body of the second support pipe through a bearing.

[0015] The mounting plate enables the installation and positioning of the probe and camera, the positioning plate enables the connection between the mounting plate and the second support tube, and the connecting bracket enables the connection between the mounting plate and the first drive motor.

[0016] Furthermore, in the small-diameter pipe inner wall automatic detection device of this utility model, guide grooves are provided on the surface of the positioning plate and the end face of the connecting frame, and the two ends of the mounting plate are respectively set in the guide grooves on the surface of the positioning plate and the connecting frame.

[0017] The guide grooves on the surface of the connecting frame and positioning plate enable the positioning function of the mounting plate, allowing the operator to adjust the radial position of the mounting plate according to the size of the pipe, thereby adapting the probe on it to the inner wall of the pipe.

[0018] Furthermore, in the small-diameter pipe inner wall automatic detection device of this utility model, the first support pipe and the second support pipe are both provided with bearings at the end near the mounting frame. The inner ring of the bearing is fixed on the first support pipe or the second support pipe, and a connecting plate is fixed on the outer ring of the bearing. The positioning plate is fixed on the surface of the connecting plate. One end of the connecting frame passes through the through hole in the middle of the connecting plate and is fixed to the output shaft of the first drive motor. Several reinforcing rods are provided between the two connecting plates.

[0019] The connecting plate facilitates the installation of the positioning plate and reinforcing rod by the operator. The reinforcing rod improves the overall stability and structural reliability of the mounting frame. The bearing enables the rotatable connection between the mounting frame and the first and second support tubes.

[0020] Furthermore, in the small-diameter pipe inner wall automatic detection device of this utility model, the drive trolley includes a housing, with walking wheels on both sides of the housing, a second drive motor and a drive shaft connected to the central shaft of the walking wheels are installed inside the housing, a first gear is installed on the drive shaft, and a second gear meshing with the first gear is installed at the output end of the second drive motor, both the first gear and the second gear are bevel gears.

[0021] The arrangement of components such as the traveling wheels, the second drive motor, and the drive shaft enables the trolley to move. The housing protects the internal components. Since the second drive motor, including the motor body and reducer, is quite long, directly connecting its output shaft to the central axle of the traveling wheels would result in an excessively long radial dimension of the trolley. By using bevel gears for the first and second gears, the output shaft of the second drive motor is perpendicular to the drive shaft, significantly reducing the overall radial dimension of the trolley and allowing the detection device to adapt to small-sized pipes.

[0022] Furthermore, in the small-diameter pipe inner wall automatic detection device of this utility model, the end of the drive trolley is provided with a connecting block, the surface of the connecting block is provided with a positioning connecting groove extending from the bottom surface, the inner wall of the positioning connecting groove is provided with a flange, and a drag rod is also provided between the drive trolley and the second support pipe. One end of the drag rod is connected to the second support pipe, and the other end is provided with an annular groove adapted to the flange.

[0023] The design of components such as connecting blocks, flanges, and trailing rods enables quick assembly and disassembly of the drive trolley and the second support tube.

[0024] Furthermore, in the small-diameter pipe inner wall automatic detection device of this utility model, the end of the second support pipe is provided with a connecting cap with two open ends, and a connecting rod fixed to the connecting cap is provided on the connecting cap. One end of the drag rod is threaded to the middle of the connecting rod.

[0025] The connecting cap and connecting rod enable the connection between the tow rod and the second support tube.

[0026] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the following describes the embodiments of this utility model in detail. Attached Figure Description

[0027] Figure 1 This is the front view of an automatic detection device for the inner wall of small-diameter pipes.

[0028] Figure 2 This is a cross-sectional view of an automatic inspection device for the inner wall of small-diameter pipes, where the drive trolley is not shown.

[0029] Figure 3 This is a 3D diagram of an automatic detection device for the inner wall of small-diameter pipes.

[0030] Figure 4 yes Figure 2 A magnified view of part A in the middle.

[0031] Figure 5 It is a three-dimensional view of the mounting bracket and its components.

[0032] Figure 6 This is a 3D view of the mounting bracket.

[0033] Figure 7 This is another 3D view of the mounting bracket.

[0034] Figure 8 This is an exploded view of the mounting bracket.

[0035] Figure 9 It is a diagram showing the assembly of the probe, probe holder, and probe base.

[0036] Figure 10 This is a diagram showing the fit between the connecting bracket and the connecting plate.

[0037] Figure 11 This is a three-dimensional view of the second support tube and its components.

[0038] Figure 12 It is a three-dimensional view of the first support tube and its components.

[0039] Figure 13 This is a three-dimensional diagram of the straightening device.

[0040] Figure 14 This is a diagram of the internal structure of the first support tube.

[0041] Figure 15 It is a 3D view of the driving vehicle, in which the shell is not fully shown.

[0042] Figure 16 This is a diagram showing the fit between the connecting block and the towing rod.

[0043] Figure 17 It is a 3D diagram of the tow bar.

[0044] Figure 18 This is a diagram showing the operational status of an automatic inspection device for the inner wall of small-diameter pipes.

[0045] In the diagram, 1 is the mounting frame, 2 is the drive trolley, 3 is the first support tube, 4 is the second support tube, 5 is the roller, 6 is the first drive motor, 7 is the probe, 8 is the camera, 9 is the connecting ring, 10 is the straightening arm assembly, 11 is the straightening arm, 12 is the support arm, 13 is the limit ring, 14 is the locking ring, 15 is the limit wheel, 16 is the annular spring groove, 17 is the mounting plate, 18 is the positioning plate, 19 is the connecting frame, 20 is the bearing, 21 is the probe seat, 22 is the probe, 23 is the probe frame, 24 is the fixed seat, 25 is the movable seat, 26 is the spring, 27 is the camera mounting seat, 28 is the guide groove, 29 is the connecting column, 30 is the rectangular plate, 31 is the connecting plate, 32 is the reinforcing rod, 33 is the housing, 34 is the traveling wheel, 35 is the drive shaft, 36 is the first gear, 37 is the second gear, 38 is the belt, 39 is the connecting block, 40 is the positioning connecting groove, 41 is the flange, 42 is the drag bar, 43 is the annular groove, 44 is the connecting cap, and 45 is the connecting rod. Detailed Implementation

[0046] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0047] Example 1: See Figures 1 to 18 The automatic detection device for the inner wall of small-diameter pipes in this embodiment includes a mounting frame 1 and a drive trolley 2. A first support pipe 3 and a second support pipe 4 are respectively provided at both ends of the mounting frame. Several straightening arms 11 with rollers 5 are provided on the pipe bodies of the first support pipe and the second support pipe. A first drive motor 6 with its output end fixed to the mounting frame is provided inside the first support pipe. Several probes 7 or cameras 8 are provided on the mounting frame. The cables connected to the probes or cameras pass through the inner cavity of the second support pipe from one end and exit from the other end. The drive trolley is fixed to the second support pipe.

[0048] The automatic detection device for the inner wall of small-diameter pipes has a probe or camera mounted between a first support pipe and a second support pipe via a mounting bracket. The first and second support pipes contact the inner wall of the pipe via their upper straightening arms. A first drive motor that drives the mounting bracket to rotate is located inside the first support pipe. The cable connecting the probe or camera passes through the inner cavity of the second support pipe on the other side of the mounting bracket and is connected to the upstream equipment. The drive trolley is fixed to the pipe body of the second support pipe, thereby realizing the displacement drive of the mounting bracket and other components.

[0049] Compared to existing pipe inspection devices, this automatic pipe inner wall inspection device for small diameter pipes places the first drive motor that drives the mounting bracket to rotate inside the first support pipe, while the cables connected to several probes or cameras on the mounting bracket pass through the second support pipe on the other side. This not only separates the cables from the first drive motor, avoiding cable tangling when the mounting bracket rotates, but also further reduces the risk of cable tangling by transmitting the cables through the inner cavity of the pipe. In addition, the built-in cables also reduce the overall radial dimension of the device. Combined with the horizontal coaxial layout of the drive trolley, the first support pipe, the mounting bracket, and the second support pipe, it can be applied to small-diameter pipe inspection applications.

[0050] The mounting bracket is used to mount probes or cameras for scanning and flaw detection or video recording of the inner wall of the pipe. One end of the bracket is fixed to the output shaft of the first drive motor inside the first support pipe, and the other end is connected to the second support pipe via a bearing. In this embodiment, both ends of the mounting bracket are connected to the first and second support pipes respectively via bearings. Several probes are mounted on the mounting bracket and positioned opposite the inner wall of the pipe to scan the inner wall. The camera is fixed in the middle of the mounting bracket to record video of the inner wall of the pipe.

[0051] The first and second support pipes are used to mount the rollers and connect the mounting frame and the drive trolley. Specifically, the first support pipe, the mounting frame, the second support pipe, and the drive trolley are connected in sequence to reduce the overall radial dimension of the device, thereby enabling it to crawl within smaller pipes and scan and photograph the inner wall of the pipe. The first support pipe also mounts the first drive motor, and the second support pipe is used for cable routing.

[0052] The first drive motor drives the mounting bracket and its several probes and cameras to rotate in both directions, enabling it to scan and inspect the inner wall of the pipe. Its body is fixed inside the first support pipe, and its output end is fixed to the mounting bracket. The wire connecting the first drive motor to the upstream equipment passes through the first support pipe and connects to the external equipment.

[0053] The cable is used to connect the probe or camera to the upstream equipment, so that the data acquired by the probe or camera can be uploaded to the host computer. The host computer can automatically or with manual assistance determine whether the pipeline is damaged based on the data analysis results.

[0054] The drive trolley is used to move the entire device inside the pipe, and the drive trolley is fixed to the second support pipe.

[0055] Preferably, both the first support pipe and the second support pipe are equipped with a straightening device, as shown in the reference. Figure 11-13The straightening device includes two connecting rings 9 fitted on the pipe body, and a plurality of straightening arm assemblies 10 are arranged between the two connecting rings. The straightening arm assembly includes a straightening arm 11 and a support arm 12 that are hinged to each other. The ends of the straightening arm and the support arm are respectively hinged to two connecting rings on the front and rear sides. The roller is arranged at the end of the straightening arm.

[0056] The straightening device straightens the first and second support pipes so that the center of the device is basically aligned with the central axis of the pipe, which facilitates the probe and camera to perform a circumferential scan of the inner wall of the pipe.

[0057] The two connecting rings are used to connect the straightening arm and the support arm, respectively. They can be fixedly installed on the outer wall of the pipe body, or locked or limited on the first support pipe or the second support pipe by locking or limiting devices, so that the straightening device can adapt to pipes with different diameters.

[0058] The straightening arm is used to install rollers and straighten the pipe. One end of it is hinged to a connecting ring on one side, and the middle part is hinged to the outer end of the support arm.

[0059] The support arm is used to support the straightening arm, thereby improving the stability of the straightening mechanism. One end of the support arm is hinged to another connecting ring, and the other end is hinged to the middle of the straightening arm. During straightening, the support arm and the straightening arm are staggered at a certain angle so that the support arm can provide stable support for the straightening arm.

[0060] In this embodiment, each straightening device includes four sets of straightening arm assemblies, which are evenly distributed around the circumference of the pipe body with the central axis as the center. This enables the straightening device to stably straighten the first support pipe or the second support pipe to the center of the pipe being inspected.

[0061] Preferably, one end of the straightening device is provided with a limiting ring 13 and the other end is provided with a locking assembly. The limiting ring is located outside one of the connecting rings and is sleeved on the body of the first support tube or the second support tube. The locking assembly includes a locking ring 14 and a limiting wheel 15 located on both sides of the other connecting ring. The locking ring and the limiting wheel are connected to the body of the first support tube or the second support tube by threads.

[0062] The setting of the limiting ring enables axial limiting of one of the limiting rings, and the setting of the locking component enables axial locking of the other limiting ring and adjustment of the expansion angle of the straightening device to adapt it to pipes of different diameters.

[0063] In this embodiment, a bearing is provided at one end of the first support tube and the second support tube connected to the mounting bracket. The inner ring of the bearing is fixed to the tube body of the first support tube or the second support tube, and the outer ring of the bearing is fixed to the mounting bracket. The outer diameter of the outer ring of the bearing is larger than the outer diameter of the first support tube and the second support tube, and its surface protrudes from the outer peripheral surface of the tube body, thereby serving as the aforementioned limiting ring to limit the connection ring.

[0064] The aforementioned locking ring and limiting wheel are located at the other end of the pipe body and on both sides of another connecting ring. They are threaded onto the pipe body. By adjusting the position of the locking ring and limiting wheel, the operator can adjust the axial position of the connecting ring, thereby changing the angle between the straightening arm and the support arm, and thus changing the degree of expansion of the entire straightening device. This allows the roller at the end of the straightening arm to adapt to the pipe with the corresponding diameter, thereby improving the applicability of the detection device.

[0065] Preferably, the locking assembly further includes a spring (not shown in the figure), which is disposed between the locking wheel and the connecting ring, with its two ends connected to the locking wheel and the connecting ring respectively.

[0066] The spring positioned between the locking wheel and the connecting ring allows the operator to adjust the axial position of the connecting ring simply by adjusting the position of the locking ring, thus facilitating quick adjustment of the expansion angle of the straightening device.

[0067] refer to Figure 14 In this embodiment, an annular spring groove 16 is provided on the inner end face of the locking wheel. The end of the spring is located in the spring groove, and the other end of the spring contacts the connecting ring. Under the action of the spring force, the connecting ring is pressed against the locking ring, thereby realizing the adjustment of the axial position of the connecting ring and the expansion angle of the locking assembly. To further secure the locking ring, the operator can lock the locking ring onto the pipe body with a locking screw. When it is necessary to adjust the axial position of the connecting ring, the operator only needs to loosen the locking screw, rotate the locking ring and adjust it to the predetermined position of the pipe body until the roller moves to the corresponding radial position. The operation is relatively convenient.

[0068] As a preferred option, refer to Figure 5-7 The mounting frame includes a mounting plate 17, with a positioning plate 18 and a connecting frame 19 respectively provided at both ends of the mounting plate. The two ends of the mounting plate are fixed to the positioning plate and the connecting frame respectively. The connecting frame is fixed to the output end of the first drive motor. The positioning plate is connected to the tube body of the second support tube through a bearing 20.

[0069] The mounting plate enables the installation and positioning of the probe and camera, the positioning plate enables the connection between the mounting plate and the second support tube, and the connecting bracket enables the connection between the mounting plate and the first drive motor.

[0070] Specifically, the mounting plate is provided with several probe seats 21, and the probe holder 23 with the probe 22 is fixed on the probe seat. The probe seat is fixed in the slot of the mounting plate by bolts. The operator can adjust the probe and the axial position of the probe by adjusting the position of the probe seat.

[0071] refer to Figure 9 The probe holder includes a fixed base 24 that is fixed to the mounting plate and a movable base 25 that is hinged to the fixed base. A spring 26 is also provided on the hinge shaft of the probe holder, with both ends of the spring connected to the fixed base and the movable base, respectively. During operation, the probe holder is pressed against the inner wall of the pipe under the action of the spring, thereby achieving close contact between the probe and the pipe. The camera is fixed at a predetermined position on the mounting plate via a camera mounting base 27, thereby enabling the imaging of the interior of the pipe.

[0072] The aforementioned positioning plate enables the positioning of the mounting plate and its connection to the second support tube. Specifically, the end of the mounting plate is fixed to the positioning plate with bolts, and the positioning plate is connected to the body of the second support tube via bearings.

[0073] The connecting bracket is used to connect the mounting plate and the output shaft of the first drive motor. The end of the mounting plate is fixed to one end of the connecting bracket, and the other end of the connecting bracket is fixed to the output shaft of the first motor by means of coupling, key connection or other means.

[0074] During operation, the output shaft of the first drive motor drives the mounting plate and its components such as probes and cameras to rotate through the connecting frame. The positioning plate at the other end of the mounting plate rotates on the second support pipe through the bearing, thereby inspecting the pipeline.

[0075] Preferably, referring to 7-8 and 10, guide grooves 28 are provided on the surface of the positioning plate and the end face of the connecting frame, and the two ends of the mounting plate are respectively disposed in the guide grooves on the surface of the positioning plate and the connecting frame.

[0076] The guide grooves on the surface of the connecting frame and positioning plate enable the positioning function of the mounting plate, allowing the operator to adjust the radial position of the mounting plate according to the size of the pipe, thereby adapting the probe on it to the inner wall of the pipe.

[0077] In this embodiment, the positioning plate has a broken ring structure with two mutually perpendicular guide grooves on its surface. The connecting frame includes a connecting column 29 fixed to the motor output shaft, and two mutually perpendicular rectangular plates 30 are fixed to the other end of the connecting column. The surfaces of the two rectangular plates are respectively provided with mutually perpendicular guide grooves. There are two mounting plates for mounting two different types of probes. One end of the mounting plate is set in the horizontal or vertical guide groove of the positioning plate, and the other end of the mounting plate is correspondingly set in the guide groove on the surface of the rectangular plate and fixed with bolts. After installation, the surfaces of the two mounting plates are basically perpendicular to each other to install the two types of probes respectively. The camera is mounted on one of the mounting plates.

[0078] Preferably, the first support tube and the second support tube are each provided with a bearing at one end near the mounting bracket. The inner ring of the bearing is fixed on the first support tube or the second support tube, and a connecting plate 31 is fixed on the outer ring of the bearing. The positioning plate is fixed on the surface of the connecting plate. One end of the connecting bracket passes through the through hole in the middle of the connecting plate and is fixed to the output shaft of the first drive motor. Several reinforcing rods 32 are provided between the two connecting plates.

[0079] The connecting plate facilitates the installation of the positioning plate and reinforcing rod by the operator. The reinforcing rod improves the overall stability and structural reliability of the mounting frame. The bearing enables the rotatable connection between the mounting frame and the first and second support tubes.

[0080] The connecting plate has a ring-shaped or hollow structure to facilitate cable transmission. Its front and rear sides have several bolt holes for connecting the bearing outer ring, mounting plate, positioning plate or reinforcing column. The connecting column of the connecting frame can be integrally formed with the connecting plate on the side of the first drive motor.

[0081] As a preferred option, refer to Figure 15 The drive trolley includes a housing 33, with wheels 34 on both sides of the housing. Inside the housing is a second drive motor and a drive shaft 35 connected to the central shaft of the wheels. A first gear 36 is mounted on the drive shaft. A second gear 37 that meshes with the first gear is mounted on the output end of the second drive motor. Both the first gear and the second gear are bevel gears.

[0082] The arrangement of components such as the traveling wheels, the second drive motor, and the drive shaft enables the trolley to move. The housing protects the internal components. Since the second drive motor, including the motor body and reducer, is quite long, directly connecting its output shaft to the central axle of the traveling wheels would result in an excessively long radial dimension of the trolley. By using bevel gears for the first and second gears, the output shaft of the second drive motor is perpendicular to the drive shaft, significantly reducing the overall radial dimension of the trolley and allowing the detection device to adapt to small-sized pipes.

[0083] During operation, the second drive motor drives the second gear to rotate, which in turn drives the first gear meshing with it and the drive shaft to rotate, ultimately causing the traveling wheels and the entire drive trolley to move inside the pipe.

[0084] To increase the friction between the traveling wheels and the inner wall of the pipe, the front and rear traveling wheels of the housing are connected by a belt 38. The belt not only connects the front and rear traveling wheels, but also, the belt made of rubber and other materials can greatly increase the friction with the pipe wall and prevent it from slipping.

[0085] Preferably, the end of the drive trolley is provided with a connecting block 39, the surface of the connecting block is provided with a positioning connecting groove 40 extending from the bottom surface, the inner wall of the positioning connecting groove is provided with a flange 41, and a drag rod 42 is also provided between the drive trolley and the second support tube. One end of the drag rod is connected to the second support tube, and the other end is provided with an annular groove 43 adapted to the flange.

[0086] The design of components such as connecting blocks, flanges, and trailing rods enables quick assembly and disassembly of the drive trolley and the second support tube.

[0087] During installation, the operator places the end of the tow rod under the connecting block, aligning its upper annular groove with the flange in the positioning connecting groove. After alignment, the tow rod is moved upward to insert the flange into the annular groove, thus axially connecting the tow rod to the drive trolley. The operator then connects the other end of the tow rod to the connector at the end of the second support tube via a threaded connection, achieving quick installation of the second support tube and the drive trolley. Disassembly is performed by reversing the procedure, making it very convenient to use.

[0088] As a preferred option, refer to Figure 11 The second support tube is provided with a connecting cap 44 with openings at both ends at its end. A connecting rod 45 fixed to the connecting cap is provided on the connecting cap. One end of the drag rod is threaded to the middle of the connecting rod.

[0089] The connecting cap and connecting rod enable the connection between the tow rod and the second support tube.

[0090] The above description is merely a preferred embodiment of this utility model, used to assist those skilled in the art in implementing the corresponding technical solutions, and is not intended to limit the scope of protection of this utility model. The scope of protection of this utility model is defined by the appended claims. It should be noted that, for those skilled in the art, several equivalent improvements and modifications can be made based on the technical solutions of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Furthermore, it should be understood that although this specification describes the embodiments as described above, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions of each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automatic detection device for the inner wall of a small-diameter pipe, comprising a mounting frame (1) and a drive trolley (2), characterized in that: The mounting frame is provided with a first support tube (3) and a second support tube (4) at both ends. The first support tube and the second support tube are each provided with a number of straightening arms (11) with rollers (5). The first support tube is provided with a first drive motor (6) whose output end is fixed to the mounting frame. The mounting frame is provided with a number of probes (7) or cameras (8). The cables connected to the probes or cameras pass through the inner cavity of the second support tube from one end and then pass out from the other end. The drive trolley is fixed to the second support tube.

2. The automatic detection device for the inner wall of small-diameter pipes according to claim 1, characterized in that: Both the first support pipe and the second support pipe are equipped with a straightening device. The straightening device includes two connecting rings (9) sleeved on the pipe body. A plurality of straightening arm assemblies (10) are arranged between the two connecting rings. The straightening arm assembly includes a straightening arm (11) and a support arm (12) that are hinged to each other. The ends of the straightening arm and the support arm are respectively hinged to the two connecting rings on the front and rear sides. The roller is arranged at the end of the straightening arm.

3. The automatic detection device for the inner wall of small-diameter pipes according to claim 2, characterized in that: One end of the straightening device is provided with a limiting ring (13), and the other end is provided with a locking assembly. The limiting ring is located outside one of the connecting rings and is sleeved on the body of the first support pipe or the second support pipe. The locking assembly includes a locking ring (14) and a limiting wheel (15) located on both sides of the other connecting ring. The locking ring and the limiting wheel are connected to the body of the first support pipe or the second support pipe by threads.

4. The automatic detection device for the inner wall of small-diameter pipes according to claim 3, characterized in that: The locking assembly also includes a spring, which is disposed between the locking wheel and the connecting ring, with its two ends connected to the locking wheel and the connecting ring respectively.

5. The automatic detection device for the inner wall of small-diameter pipes according to claim 1, characterized in that: The mounting frame includes a mounting plate (17), with a positioning plate (18) and a connecting frame (19) respectively provided at both ends of the mounting plate. The two ends of the mounting plate are fixed to the positioning plate and the connecting frame respectively. The connecting frame is fixed to the output end of the first drive motor. The positioning plate is connected to the tube body of the second support tube through a bearing (20).

6. The automatic detection device for the inner wall of small-diameter pipes according to claim 5, characterized in that: Guide grooves (28) are provided on the surface of the positioning plate and the end face of the connecting frame, and the two ends of the mounting plate are respectively located in the guide grooves on the surface of the positioning plate and the connecting frame.

7. The automatic detection device for the inner wall of small-diameter pipes according to claim 6, characterized in that: The first support tube and the second support tube are each provided with a bearing at one end near the mounting bracket. The inner ring of the bearing is fixed on the first support tube or the second support tube, and a connecting plate (31) is fixed on the outer ring of the bearing. The positioning plate is fixed on the surface of the connecting plate. One end of the connecting bracket passes through the through hole in the middle of the connecting plate and is fixed to the output shaft of the first drive motor. Several reinforcing rods (32) are provided between the two connecting plates.

8. The automatic detection device for the inner wall of small-diameter pipes according to claim 1, characterized in that: The drive trolley includes a housing (33), with wheels (34) on both sides of the housing. Inside the housing is a second drive motor and a drive shaft (35) connected to the central shaft of the wheels. A first gear (36) is provided on the drive shaft. A second gear (37) meshes with the first gear is provided at the output end of the second drive motor. Both the first gear and the second gear are bevel gears.

9. The automatic detection device for the inner wall of small-diameter pipes according to claim 1 or 8, characterized in that: The end of the drive trolley is provided with a connecting block (39), the surface of the connecting block is provided with a positioning connecting groove (40) extending from the bottom surface, the inner wall of the positioning connecting groove is provided with a flange (41), and a drag rod (42) is also provided between the drive trolley and the second support pipe. One end of the drag rod is connected to the second support pipe, and the other end is provided with an annular groove (43) adapted to the flange.

10. The automatic detection device for the inner wall of a small-diameter pipe according to claim 9, characterized in that: The end of the second support tube is provided with a connecting cap (44) with openings at both ends, and a connecting rod (45) fixed to the connecting cap is provided on the connecting cap. One end of the drag rod is threaded to the middle of the connecting rod.

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