A pipe inner wall cleaning device

Abstract

The application provides a pipe inner wall cleaning device, which comprises a movable frame, at least one supporting frame, a supporting rod, a pipe limiting mechanism and a cleaning head. The supporting rod is installed on the movable frame, the pipe limiting mechanism is arranged on the supporting frame to restrict the position state of the pipe during the cleaning process, and the cleaning head is installed on the end of the supporting rod. The cleaning head comprises a shell and a nozzle movably arranged in the shell. The nozzle has a retracted position and an extended position. The cleaning head forms a first pressure cavity, the internal hydraulic medium of which is in contact with the force bearing structure of the nozzle to provide hydraulic pressure, thereby driving the nozzle to tend to the retracted position. The cleaning head is provided with a channel for the flushing medium to enter. The flushing medium at least partially acts on the force bearing structure through the channel, so that the nozzle tends to move to the extended position. The pipe inner wall cleaning device of the application can realize the linkage adjustment of the target distance and the flushing pressure through the cooperation of the flushing medium and the hydraulic medium.

Description

Technical Field

[0001] This invention relates to the field of pipe cleaning technology, and more specifically to a pipe inner wall cleaning device. Background Technology

[0002] Many pipes or fittings have varying inner diameters. When cleaning the inner walls of pipes using high-pressure water jet cleaning devices, existing pipe inner wall cleaning devices typically use cleaning heads with fixed target distances. During the cleaning process, it is necessary to frequently change cleaning heads of different lengths to clean different parts of the inner wall of the pipes or fittings. This results in poor adaptability of the cleaning heads and low cleaning efficiency.

[0003] To address the aforementioned problems, several retractable cleaning head solutions exist in the prior art. For example, CN213727199U discloses an automatic retractable high-pressure cleaning head, comprising a connecting body, a limiting body, a telescopic body, a return spring, and a limiting nut. The connecting body has a water hole connected to a high-pressure water source. The return spring is sleeved on the outside of the telescopic body, with its upper end abutting against the protruding edge at the top of the telescopic body and its lower end abutting against the bottom of the limiting nut. High-pressure water enters through the water hole and pushes against the tapered portion at the lower end of the guide hole of the telescopic body, causing the telescopic body to move downwards against the tension of the return spring. This solution achieves telescopic movement by directly pushing the telescopic body against the spring force using high-pressure water, thus solving the problem of poor adaptability of fixed cleaning heads to a certain extent.

[0004] However, the existing technology described above struggles to achieve coordinated adjustment of target distance and pressure: because the spring is directly sleeved on the outside of the telescopic body, the change in spring force is linearly related to the displacement of the telescopic body. When the inner diameter of the pipe changes, the telescopic body can only be moved by changing the water pressure, making it impossible to achieve precise target distance control over a wide pressure range, thus limiting the cleaning effect. Therefore, it is necessary to propose a pipe inner wall cleaning device that can achieve coordinated adjustment of target distance and flushing pressure. Summary of the Invention

[0005] The main objective of this invention is to provide a pipe inner wall cleaning device that can achieve linkage adjustment of target distance and flushing pressure.

[0006] To achieve the above objectives, the present invention proposes a pipe inner wall cleaning device, comprising a movable frame, at least one supporting frame, a support rod, a pipe limiting mechanism, and a cleaning head; the support rod is mounted on the movable frame, the pipe limiting mechanism is disposed on the supporting frame to constrain the position of the pipe during the cleaning process, and the cleaning head is mounted on the end of the support rod; The cleaning head includes a housing and a nozzle movably disposed in the housing, the nozzle having a retracted position and an extended position; the cleaning head forms a first pressure chamber, the internal hydraulic medium of which contacts the bearing structure of the nozzle to provide hydraulic pressure, thereby driving the nozzle toward the retracted position, the first pressure chamber being an open cavity, allowing the force-applying component to push the internal hydraulic medium to provide hydraulic pressure; the cleaning head is provided with a channel for flushing medium to enter, the flushing medium acting at least partially on the bearing structure of the nozzle through the channel, causing the nozzle to move toward the extended position.

[0007] Optionally, the support rod is set horizontally, and the pipe inner wall cleaning device also includes an elastic pre-tightening element, which is set inside the support rod. The elastic pre-tightening element connects the support rod and the movable frame and applies a pre-tightening force to the support rod.

[0008] Optionally, the elastic preload is arranged along the length of the support rod, and the elastic preload is set at an inclined angle relative to the axis of the support rod.

[0009] Optionally, the support frame includes a first support frame and a second support frame arranged opposite to each other, and the pipe limiting mechanism includes two spaced axial limiting mechanisms respectively installed on the first support frame and the second support frame to limit the axial displacement of the pipe; and a clamping mechanism installed on the first support frame and / or the second support frame to limit the vertical runout of the pipe.

[0010] Optionally, the axial limiting mechanism includes a fixed plate and rolling elements. The fixed plate is fixed to the corresponding support frame and has several positioning holes; the rolling elements are disposed in the positioning holes and can rotate freely and roll in contact with the end of the pipe to limit the axial displacement of the pipe while allowing the pipe to rotate.

[0011] Optionally, the axial limiting mechanism includes a cover plate with limiting grooves corresponding to the positioning holes, and the rolling elements are installed in the space formed by the positioning holes and the limiting grooves.

[0012] Optionally, the clamping mechanism includes a drive component and a clamping component. The drive component is mounted on a corresponding support frame, and the clamping component is connected to the drive component in a transmission manner. The drive component drives the clamping component to move closer to or away from the pipe surface, and the clamping component can roll as the pipe rotates.

[0013] Optionally, the pipe inner wall cleaning device also includes a pipe driving mechanism, which includes a driving source, a first driving wheel and a second driving wheel. The first driving wheel and the second driving wheel are arranged opposite to each other on both sides of the pipe and form an included angle. The driving source drives at least one of the first driving wheel and the second driving wheel to rotate, thereby driving the pipe to rotate and move axially.

[0014] Optionally, the pipe inner wall cleaning device also includes a flushing medium supply mechanism, which is connected to the cleaning head through a flushing medium pipeline. A guide chain is provided on the movable frame, and the flushing medium pipeline passes through the guide chain and the inside of the support rod before connecting to the cleaning head.

[0015] Optionally, the pipe inner wall cleaning device also includes a flushing medium circulation system, which includes a collection tank, a filtration mechanism, and a storage tank. The collection tank is located below the support frame and is used to collect the flushing medium and impurities after cleaning. The filtration mechanism is connected to the collection tank and is used to filter the collected flushing medium. The storage tank is connected to the filtration mechanism and is used to store the filtered flushing medium for recycling.

[0016] In the technical solution of the present invention, a portion of the flushing medium flows through the spray channel of the nozzle and is sprayed outward, while another portion acts on the bearing structure of the nozzle to provide thrust, causing the nozzle to tend to move toward the extended position. When the hydraulic pressure is less than or equal to the hydraulic pressure provided by the hydraulic medium inside the first pressure chamber, the nozzle remains in the retracted position or moves toward the retracted position. When the impact force is greater than the hydraulic pressure, the nozzle moves toward the extended position. While the flushing medium is cleaning, its pressure changes can directly drive the nozzle to extend and retract. When the inner diameter of the pipe increases, the high-pressure water pressure increases. When the pressure exceeds the hydraulic pressure, the nozzle automatically extends and the target distance decreases. Combined with the increase in flushing pressure, effective cleaning of the inner wall of the pipe can be achieved. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an embodiment of the pipe inner wall cleaning device of the present invention; Figure 2 This is a schematic diagram of the working state of the pipe inner wall cleaning device of the present invention; Figure 3 for Figure 2 A magnified view of a portion of the image; Figure 4 This is a schematic diagram of the movable frame in this invention; Figure 5 This is a schematic diagram of the axial limiting mechanism in this invention; Figure 6 This is a schematic diagram of the clamping mechanism in this invention; Figure 7 This is a schematic diagram of the cleaning head in this invention.

[0019] Explanation of icon numbers: 1. First support frame; 2. Pipe; 3. Second support frame; 4. Cleaning head; 401. Housing; 402. First sealing element; 403. First pressure chamber; 404. Nozzle; 405. Second sealing element; 406. Limiting element; 407. Third sealing element; 408. Oil passage; 409. Second pressure chamber; 410. Fourth sealing element; 411. Force transmission element; 412. Vent; 413. Spring cover plate; 414. Fixed guide rod; 415. Elastic element; 416. Flushing medium interface; 417. Fifth sealing element; 418. Channel; 418a. First flushing medium chamber; 418b, Through hole; 418c, Second flushing medium chamber; 5, Support rod; 6, Flushing medium pipeline; 7, Elastic pre-tightening component; 8, Movable frame; 9, Flushing medium supply mechanism; 10, Storage tank; 11, Filtration mechanism; 12, Collection tank; 13, Guide chain; 14, Support frame; 15, Guide rail; 16, Drive source; 17, First drive wheel; 18, Second drive wheel; 19, Axial limiting mechanism; 191, Fixed plate; 192, Cover plate; 193, Rolling element; 194, Positioning hole; 195, Limiting groove; 20, Pressing mechanism; 201, Drive component; 202, Connecting component; 203, Pressing component.

[0020] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0023] This invention proposes a pipe inner wall cleaning device.

[0024] Please refer to Figures 1 to 7The pipe inner wall cleaning device includes a movable frame 8, at least one support frame, a support rod 5, a pipe limiting mechanism, and a cleaning head 4. The support rod 5 is mounted on the movable frame 8, and the pipe limiting mechanism is set on the support frame to constrain the position of the pipe 2 during the cleaning process. The cleaning head 4 is mounted on the end of the support rod 5. The cleaning head 4 includes a housing 401 and a nozzle 404 movably disposed on the housing 401. The nozzle 404 has a retracted position and an extended position. The cleaning head 4 forms a first pressure chamber 403, in which the internal hydraulic medium contacts the load-bearing structure of the nozzle 404 to provide hydraulic pressure, thereby driving the nozzle 404 to tend towards the retracted position. The first pressure chamber 403 is an open cavity, allowing the force-applying component to push the internal hydraulic medium to provide hydraulic pressure. The cleaning head 4 is provided with a channel 418 for the flushing medium to enter. The flushing medium acts at least partially on the load-bearing structure of the nozzle 404 through the channel 418, causing the nozzle 404 to tend to move towards the extended position. The pipe inner wall cleaning device also includes a guide rail 15. When the pipe 2 is placed on the work station, its axis is consistent with the length direction of the guide rail 15, and the movable frame 8 can slide along the guide rail 15.

[0025] In this embodiment, channel 418 receives external flushing medium through flushing medium interface 416, and the hydraulic medium in the first pressure chamber 403 is hydraulic oil. While the flushing medium pushes the nozzle 404 to extend, a portion of it flows through the spray channel of the nozzle 404 and sprays outward to perform cleaning operations, thereby achieving "one medium for two purposes". It serves as both a cleaning power source and a driving source for the extension and retraction of the nozzle 404, eliminating the need for additional driving devices and making the structure more compact.

[0026] While the flushing medium is cleaning, its pressure changes can directly drive the nozzle 404 to extend and retract. When the inner diameter of the pipe 2 increases, the flushing pressure increases. When the flushing pressure exceeds the hydraulic pressure, the nozzle 404 automatically extends and the target distance decreases. In conjunction with the increase in flushing pressure, the target distance and flushing pressure can be linked and adjusted, resulting in a better cleaning effect and effective cleaning of the inner wall of the pipe 2.

[0027] In the technical solution of this invention, a portion of the flushing medium flows through the spray channel of the nozzle 404 and is sprayed outward, while another portion acts on the load-bearing structure of the nozzle 404, providing thrust to make the nozzle 404 tend to move towards the extended position. When the flushing pressure is less than or equal to the hydraulic pressure provided by the hydraulic medium inside the first pressure chamber 403, the nozzle 404 remains in the retracted position or moves towards the retracted position. When the flushing pressure is greater than the hydraulic pressure, the nozzle 404 moves towards the extended position. While the flushing medium is cleaning, its pressure change can directly drive the nozzle 404 to extend and retract. When the inner diameter of the pipe 2 increases, the flushing pressure increases. After the flushing pressure exceeds the hydraulic pressure, the nozzle 404 automatically extends, and the target distance decreases. With the increase in flushing pressure, effective cleaning of the inner wall of the pipe 2 can be achieved.

[0028] Optionally, the support rod 5 is horizontally positioned. The pipe inner wall cleaning device also includes an elastic pre-tensioner 7, which is installed inside the support rod 5. The elastic pre-tensioner 7 connects the support rod 5 to the movable frame 8 and applies a pre-tension force to the support rod 5 to enhance its rigidity and vibration resistance. The pipe 2 is horizontally positioned. During the cleaning operation, the support rod 5 extends into the pipe 2 and bears the reaction force of the high-pressure water jet. This reaction force can easily cause the support rod 5 to vibrate and bend, affecting the positioning accuracy and cleaning effect of the nozzle 404. By installing the elastic pre-tensioner 7 inside the support rod 5, the pre-tension force of the elastic pre-tensioner 7 keeps the support rod 5 in a taut state, effectively counteracting the bending deformation caused by the jet reaction force, suppressing vibration, and thus improving the cleaning accuracy and service life of the support rod 5.

[0029] In addition, when cleaning long pipes 2, the support rod 5 needs to be of a large length, which causes the support rod 5 to have obvious bending deflection. The elastic pre-tightening member 7 can increase the strength of the support rod 5 and increase the range of lengths of pipes 2 that can be cleaned.

[0030] Optionally, the elastic preload 7 is arranged along the length of the support rod 5, and the elastic preload 7 is set at an inclined angle relative to the axis of the support rod 5. By arranging the elastic preload 7 at an inclined angle, the tension of the elastic preload 7 can be decomposed into an axial component along the axis of the support rod 5 and a radial component perpendicular to the axis of the support rod 5. The axial component is used to resist the axial compressive deformation of the support rod 5, while the radial component is used to increase the lateral stiffness of the support rod 5 and resist the lateral bending caused by the jet reaction force. Compared with the parallel arrangement along the axis, the inclined arrangement can apply bidirectional preload force of axial and radial to the support rod 5 at the same time, and the bending and vibration resistance is more significant.

[0031] Optionally, the elastic pretensioner 7 can be configured as one or more. When multiple elastic pretensioners 7 are configured, they can be evenly distributed along the circumference of the support rod 5 or distributed at a predetermined angle.

[0032] Optionally, the support frame includes a first support frame 1 and a second support frame 3 arranged opposite to each other, and the pipe limiting mechanism includes two spaced-apart axial limiting mechanisms 19 and a clamping mechanism 20; wherein, the axial limiting mechanisms 19 are respectively installed on the first support frame 1 and the second support frame 3 to limit the axial displacement of the pipe 2; the clamping mechanism 20 is installed on the first support frame 1 and / or the second support frame 3 to limit the vertical runout of the pipe 2; the synergistic effect of the above structures ensures that the pipe 2 maintains a stable rotational state during the cleaning process, ensuring the relative positional accuracy between the cleaning head 4 and the inner wall of the pipe 2, thereby ensuring the uniformity and consistency of the cleaning effect. In this embodiment, the first support frame 1 can slide along the guide rail 15, and the second support frame 3 is fixedly arranged to cooperate in limiting pipes 2 of different lengths.

[0033] Optionally, the axial limiting mechanism 19 includes a fixed plate 191 and a rolling element 193. The fixed plate 191 is fixed on the corresponding support frame. The fixed plate 191 is provided with a plurality of positioning holes 194. The rolling element 193 is disposed in the positioning holes 194. The rolling element 193 can rotate freely and roll in contact with the end of the pipe 2, so as to allow the pipe 2 to rotate while limiting the axial displacement of the pipe 2.

[0034] Specifically, the rolling element 193 is preferably a ball or roller; when the end of the tube 2 contacts the rolling element 193, the axial movement of the tube 2 is blocked by the rolling element 193, thereby realizing the axial limiting function; at the same time, since the rolling element 193 can rotate freely in the positioning hole 194, when the tube 2 rotates around its own axis, the end of the tube 2 and the rolling element 193 have rolling friction rather than sliding friction, the frictional resistance is small, effectively avoiding wear on the end of the tube 2, and also reducing the power consumption required to drive the tube 2 to rotate; in addition, the multi-point contact method between the rolling element 193 and the end of the tube 2 makes the force distribution on the end of the tube 2 more uniform, avoiding deformation of the tube 2 caused by local stress concentration.

[0035] Optionally, the axial limiting mechanism 19 also includes a cover plate 192, on which a limiting groove 195 corresponding to the positioning hole 194 is provided. The rolling element 193 is installed in the space formed by the positioning hole 194 and the limiting groove 195. Through the cooperation of the positioning hole 194 and the limiting groove 195, the rolling element 193 is held in a predetermined position, which ensures that the rolling element 193 can rotate freely and prevents the rolling element 193 from falling out of the fixed plate 191.

[0036] In this embodiment, the positioning hole 194 is preferably a hemispherical hole, and the limiting groove 195 is preferably a hemispherical groove. The space formed by the combination of the two matches the shape of the rolling element 193, so that a part of the rolling element 193 protrudes from the surface of the fixing plate 191 so as to contact the end of the pipe 2, while ensuring that the rolling element 193 will not come out when subjected to pressure from the end of the pipe 2. The fixing plate 191 and the cover plate 192 are both annular plates, with an opening in the middle for the support rod 5 and the cleaning head 4 to pass through.

[0037] Optionally, the clamping mechanism 20 includes a driving component 201 and a clamping component 203. The driving component 201 is mounted on a corresponding support frame, and the clamping component 203 is connected to the driving component 201 in a transmission manner. The driving component 201 drives the clamping component 203 to approach or move away from the surface of the pipe 2, and the clamping component 203 can roll as the pipe 2 rotates.

[0038] Specifically, the driving component 201 and the clamping component 203 are connected by the connecting component 202. The driving component 201 is preferably an electric cylinder, a pneumatic cylinder or a hydraulic cylinder, which has the advantages of controllable stroke and stable output force, making it easy to accurately control the clamping force of the clamping component 203 on the surface of the pipe 2.

[0039] The clamping element 203 is preferably a roller or a wheel. When the clamping element 203 is pressed against the outer surface of the pipe 2 and the pipe 2 rotates, the clamping element 203 rotates along with it under the action of friction, thereby converting the sliding friction between the pipe 2 and the clamping element 203 into rolling friction, which reduces frictional resistance and avoids scratches on the outer surface of the pipe 2.

[0040] The clamping mechanism 20 is symmetrically installed on both sides of the support frame. It applies downward clamping force from above the pipe 2. Together with the self-weight of the pipe 2 and the supporting force of the support frame on the pipe 2, it effectively suppresses the up-and-down jumping caused by mass eccentricity or speed fluctuation when the pipe 2 rotates.

[0041] Optionally, the pipe inner wall cleaning device further includes a pipe driving mechanism, which includes a drive source 16, a first drive wheel 17, and a second drive wheel 18. The rotation axis of the first drive wheel 17 is parallel to the axis of the pipe 2 to drive the pipe 2 to rotate around its own axis. The rotation axis of the second drive wheel 18 forms an angle with the axis of the pipe 2 on the horizontal plane to drive the pipe 2 to move along its own axis. The drive source 16 drives at least one of the first drive wheel 17 and the second drive wheel 18 to rotate.

[0042] Specifically, the drive source 16 is preferably a drive motor. Multiple first drive wheels 17 and second drive wheels 18 are provided, arranged opposite to each other on both sides of the pipe 2 to restrict the pipe 2 from deviating from its own axis. In this embodiment, the drive source 16 drives the first drive wheel 17 to rotate. The rotation axis of the first drive wheel 17 is parallel to and spaced apart from the axis of the pipe 2, and its outer wall contacts the outer wall of the pipe 2, causing the pipe 2 to rotate around its own axis. The pipe 2 then drives the second drive wheel 18 to rotate. The rotation axis of the second drive wheel 18 forms an angle with the axis of the pipe 2 on the horizontal plane, thereby providing the pipe 2 with an axial movement component along its own axis, realizing the composite motion of rotation and axial movement of the pipe 2. Before cleaning, the drive mechanism drives the pipe 2 to move towards the second support frame 3, so that one end of the pipe 2 abuts against the axial limiting mechanism 19 on the second support frame 3. Then, the first support frame 1 moves, and the axial limiting mechanism 19 on it abuts against the other end of the pipe 2, thereby completing the axial limiting of the pipe 2.

[0043] By adjusting the rotational speed of the drive source 16, the rotational speed and axial movement speed of the pipe 2 can be precisely controlled; by adjusting the angle between the second drive wheel 18 and the axis of the pipe 2, the ratio of the rotational speed to the axial movement speed of the pipe 2 can be adjusted to adapt to the needs of different cleaning processes. The first drive wheel 17 and the second drive wheel 18 are both mounted on the support frame 14 and are spaced apart from the ground.

[0044] Optionally, the pipe inner wall cleaning device also includes a flushing medium supply mechanism 9, which is connected to the cleaning head 4 via a flushing medium pipeline 6. A guide chain 13 is provided on the movable frame 8. The flushing medium pipeline 6 passes through the guide chain 13 and the support rod 5 before connecting to the cleaning head 4. The flushing medium supply mechanism 9 pressurizes the flushing medium (such as water or cleaning fluid) to a predetermined pressure and delivers it to the cleaning head 4 through the flushing medium pipeline 6. The flushing medium pipeline 6 passes sequentially through the guide chain 13 and the support rod 5. The guide chain 13 has a U-shaped structure and guides and protects the flushing medium pipeline 6, preventing it from becoming entangled, bent, or worn during the movement of the movable frame 8. The flushing medium pipeline 6 is arranged inside the support rod 5, using the support rod 5 as a protective sleeve, preventing the flushing medium pipeline 6 from being exposed to the external environment, effectively protecting the pipeline, and also making the overall structure simpler and more aesthetically pleasing.

[0045] Optionally, the pipe inner wall cleaning device also includes a flushing medium circulation system. The flushing medium circulation system includes a collection tank 12, a filter mechanism 11, and a storage tank 10. The collection tank 12 is located below the support frame and is used to collect the flushing medium and impurities after cleaning. The filter mechanism 11 is connected to the collection tank 12 and is used to filter the collected flushing medium. The storage tank 10 is connected to the filter mechanism 11 and is used to store the filtered flushing medium for recycling.

[0046] Specifically, during the cleaning process, the flushing medium, carrying detached dirt, rust, and other impurities, flows out from the end of pipe 2 and falls into the collection tank 12 located below the support frame. The flushing medium containing impurities is collected in the collection tank 12 and flows into a sedimentation ditch (not shown in the figure) for preliminary sedimentation, causing large particles to settle. The settled flushing medium then enters the filtration mechanism 11 for fine filtration to remove suspended fine particles. The purified flushing medium is then temporarily stored in the storage tank 10, awaiting re-extraction and pressurization by the flushing medium supply mechanism 9, thus achieving the recycling of the flushing medium. This recycling system significantly reduces water consumption and wastewater discharge during cleaning operations, lowers operating costs, and meets environmental protection requirements.

[0047] Optionally, the channel 418 includes a first flushing medium chamber 418a, a through hole 418b, and a second flushing medium chamber 418c connected in sequence. One end of the load-bearing structure of the nozzle 404 is in contact with the hydraulic medium in the first pressure chamber 403, and the other end is in contact with the flushing medium in the second flushing medium chamber 418c.

[0048] The volume of the first flushing medium cavity 418a is greater than the volume of the second flushing medium cavity 418c. The first flushing medium cavity 418a constitutes the main cavity for containing the flushing medium. The shape of the cavity wall of the second flushing medium cavity 418c is adapted to the load-bearing structure of the nozzle 404 to increase the contact area between the flushing medium and the load-bearing structure of the nozzle 404.

[0049] Because the shape of the second flushing medium chamber 418c is adapted to the load-bearing structure of the nozzle 404, the effective pressure-bearing contact area between the flushing medium and the load-bearing structure can be increased. Under the same flushing pressure, the flushing medium exerts a greater thrust on the nozzle 404, or in other words, the flushing pressure required to achieve the same thrust is lower, making it easier for the nozzle 404 to overcome the hydraulic pressure provided by the hydraulic medium in the first pressure chamber 403 and extend. At the same time, the volume of the first flushing medium chamber 418a is larger than that of the second flushing medium chamber 418c, which can serve as the main receiving chamber, which is beneficial for stabilizing the liquid supply and buffering pressure fluctuations. The second flushing medium chamber 418c is small in volume and adapted to the load-bearing structure, which is beneficial for the compact structure of the cleaning head 4. Thus, in conjunction with the pressure balance relationship on the hydraulic side of the first pressure chamber 403, the critical pressure for the retraction and extension of the nozzle 404 can be set more accurately, realizing the linkage adjustment of the target distance and flushing pressure, and improving the cleaning effect on the inner wall of pipes 2 with different inner diameters.

[0050] The load-bearing structure of the nozzle 404 is a ring-shaped structure, which is fixedly sleeved on one end of the nozzle 404 at the liquid inlet. A first sealing element 402 is arranged around its periphery to form a seal with the first pressure chamber 403.

[0051] Optionally, the nozzle 404 is retractably disposed within the first pressure chamber 403, and the flow direction of the flushing medium in the channel 418 is perpendicular to the retraction direction of the nozzle 404. The retraction direction of the nozzle 404 needs to be consistent with the radial direction of the pipe 2 to clean the inner wall of the pipe 2 and adjust the target distance, while the cleaning head 4 needs to travel along the length of the pipe 2 to accommodate cleaning pipes of different lengths. The flow direction of the flushing medium in the channel 418 is perpendicular to the retraction direction of the nozzle 404 to facilitate connection to an external water pump via pipeline.

[0052] Optionally, the housing 401 also forms a second pressure chamber 409, and the first pressure chamber 403 and the second pressure chamber 409 are connected through an oil passage 408. The diameter of the oil passage 408 is smaller than the diameter of the first pressure chamber 403 and the second pressure chamber 409, thereby ensuring pressure transmission while damping the flow of hydraulic oil and preventing the nozzle 404 from being too sensitive in its extension and retraction movements, thus avoiding oscillations.

[0053] Optionally, a force-applying component is disposed within the housing 401 to provide driving force to the hydraulic medium within the second pressure chamber 409, causing the nozzle 404 to tend toward the retracted position.

[0054] Optionally, the force-applying component includes a force-transmitting element 411 and an elastic element 415. The force-transmitting element 411 is used to close the second pressure chamber 409 and is in contact with the hydraulic medium inside the second pressure chamber 409. The elastic element 415 is used to push the force-transmitting element 411 to provide hydraulic pressure to the second pressure chamber 409. One end of the elastic element 415 abuts against the end face of the force-transmitting element 411 away from the second pressure chamber 409, and the other end abuts against the spring cover plate 413. The elastic element 415 is in a compressed state and always applies elastic force to the force-transmitting element 411. This elastic force is transmitted to the hydraulic medium in the second pressure chamber 409 through the force-transmitting element 411, and then to the first pressure chamber 403 through the oil passage 408, and finally acts on the load-bearing structure of the nozzle 404. Through the synergistic action of the elastic element 415 and the hydraulic medium, the elastic force can be smoothly and continuously transmitted to the nozzle 404, avoiding the mechanical impact and wear caused by the elastic element 415 directly hitting the nozzle 404, and extending the service life of the cleaning head 4.

[0055] By setting up a first pressure chamber 403 and a second pressure chamber 409, which are connected through an oil passage and filled with a fluid pressure transmission medium, the preload of the elastic element 415 is transmitted to the fluid medium via the force transmission element 411 (in this embodiment, an annular movable guide sleeve), and then transmitted to the nozzle 404 by the fluid medium. Compared with the prior art where the return spring is directly sleeved on the outside of the telescopic body and the spring force acts directly on the telescopic body, the hydraulic force transmission method of the present invention makes the force transmission of the elastic element 415 more stable and uniform, avoids the impact and wear caused by direct mechanical contact of the elastic element 415, and makes the extension and retraction action of the nozzle 404 more stable and reliable.

[0056] Furthermore, based on Pascal's principle, this invention sets up a first pressure chamber 403 and a second pressure chamber 409 and connects them through an oil passage 408, so that the driving force generated by the elastic element 415 is transmitted to the hydraulic medium through the force transmission element 411 and can act on the load-bearing structure of the nozzle 404 in a manner of equal pressure. In the application scenario of the pipe inner wall cleaning device, the cleaning head 4 needs to be inserted into the pipe 2 for operation. Its outer diameter is strictly limited by the inner diameter of the pipe. The radial and axial space inside the housing 401 for arranging force-applying elements such as elastic element 415 is extremely limited. If the transmission method of the elastic element 415 directly abutting the nozzle 404 is adopted, in order to obtain sufficient driving force to balance the thrust of the high-pressure flushing medium on the nozzle 404, it is often necessary to select a large-size, high-rigidity elastic element 415. This not only contradicts the compact design requirements of the cleaning head 4, but also limits the maximum flushing pressure that the cleaning head 4 can withstand. This invention cleverly resolves this contradiction by introducing a hydraulic medium as an intermediate force transmission medium: the elastic force of the elastic element 415 first acts on the force transmission element 411, and then is transmitted to the first pressure chamber 403 through the hydraulic medium in the second pressure chamber 409 and the oil passage 408, and finally acts on the load-bearing structure of the nozzle 404. In this indirect transmission path, by using hydraulic constant pressure and variable area, it is possible to adapt to higher flushing pressures under the conditions of limited volume of the cleaning head 4 and limited strength and volume of the elastic element 415. Meanwhile, because the hydraulic medium is incompressible, it can efficiently and without loss transmit the driving force of the elastic element 415 to the nozzle 404, so that the cleaning head 4 can still provide sufficient driving force to match the thrust requirements of the high-pressure flushing medium while maintaining a compact shape, thereby significantly improving the high-pressure operation capability of the cleaning head 4.

[0057] In this embodiment, the force transmission element 411 is surrounded by a fourth sealing element 410 and a fifth sealing element 417 to seal the second pressure chamber 409.

[0058] Optionally, a mounting cavity is formed within the housing 401. The force transmission element 411 divides the mounting cavity into a second pressure chamber 409 and a movable cavity for accommodating the elastic element 415. The movable cavity has a vent hole 412 to connect to an external air pump. The external air pump and the elastic element 415 work together to drive the force transmission element 411. The elastic element 415 provides a basic thrust to the force transmission element 411, so that when the cleaning head 4 is not in use, the nozzle 404 is also retracted into the housing 401. When the cleaning head 4 is working, the external air pump can easily adjust the overall driving force, thereby adjusting the extension and retraction position of the nozzle 404 to adjust the target distance. In this embodiment, the force transmission element 411 is a ring-shaped structural component, which is movably sleeved on the fixed guide rod 414 in the mounting cavity. The fixed guide rod 414 and the housing 401 are integrally formed.

[0059] Optionally, the mounting cavity is arranged parallel to the first flushing medium cavity 418a, and both the mounting cavity and the first flushing medium cavity 418a are arranged perpendicular to the first pressure cavity 403, making the overall structure of the cleaning head 4 more compact.

[0060] Optionally, the driving force is adjustable to accommodate the cleaning needs of pipes with different inner diameters. For pipes with small changes in inner diameter, a smaller driving force can be used, allowing the nozzle 404 to extend with a lower thrust; for pipes with large changes in inner diameter, a larger driving force can be used, allowing the nozzle to extend with a higher thrust, thus ensuring a suitable target distance at each thrust level.

[0061] Optionally, the driving force can be adjusted by replacing the elastic element 415 with different parameters. By replacing the elastic element 415 with different stiffness coefficients, the magnitude of the driving force acting on the nozzle 404 can be changed. In another embodiment, the spring cover plate 413 is threaded to the end of the movable cavity away from the force transmission element 411. By turning the spring cover plate 413, the preset distance between it and the force transmission element 411 can be changed (i.e., the distance between the spring cover plate 413 and the force transmission element 411 when the cleaning head 4 is not connected to the flushing medium), thereby adjusting the compression and preload of the elastic element 415.

[0062] Optionally, the cleaning head 4 further includes a limiting member 406 disposed at the front end of the first pressure chamber 403. The limiting member 406 is used to limit the maximum extension amount of the nozzle 404 when it extends to the extended position. In this embodiment, a second sealing element 405 is provided between the limiting member 406 and the housing 401, and a third sealing element 407 is provided between the limiting member 406 and the nozzle 404 to ensure the sealing of the first pressure chamber 403 and prevent hydraulic oil leakage.

[0063] A method for cleaning the inner wall of a pipe, using any of the cleaning heads 4 described above, includes the following steps: A flushing medium is supplied to the nozzle 404 at a first pressure. The thrust of the flushing medium on the nozzle 404 is less than or equal to the driving force. The nozzle 404 remains in a retracted state and cleans the inner wall of the pipe at a first target distance. A flushing medium is supplied to the nozzle 404 at a second pressure. The thrust of the flushing medium on the nozzle 404 is greater than the driving force. The nozzle 404 extends and cleans the inner wall of the pipe 2 at a second target distance. The second pressure is greater than the first pressure, and the second target distance is less than the first target distance.

[0064] In this method, the specific values ​​of the first and second pressures are determined based on the degree of change in the inner diameter of the pipe 2. When the inner diameter of the pipe 2 is within the normal range, the first pressure is used, and the nozzle 404 retracts, cleaning with a smaller pressure and a larger target distance. When the inner diameter of the pipe 2 increases, the second pressure is switched on. At this time, the nozzle 404 extends, the target distance decreases, and the flushing medium pressure increases, compensating for the jet attenuation caused by the increase in inner diameter and ensuring that the impact force of the jet on the pipe wall remains within the effective range. The operator can adjust the supply pressure in real time according to the change in the inner diameter of the pipe 2, so that the cleaning head 4 extends or retracts adaptively without stopping the machine to replace the cleaning head 4, achieving continuous and efficient cleaning operations.

[0065] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A pipe inner wall cleaning device, comprising a movable frame (8), at least one supporting frame, a support rod (5), a pipe limiting mechanism, and a cleaning head (4); the support rod (5) is mounted on the movable frame (8), the pipe limiting mechanism is disposed on the supporting frame for constraining the position of the pipe (2) during the cleaning process, and the cleaning head (4) is mounted on the end of the support rod (5), characterized in that: The cleaning head (4) includes a housing (401) and a nozzle (404) movably disposed in the housing (401), the nozzle (404) having a retracted position and an extended position; The cleaning head (4) has a first pressure chamber (403) in which the internal hydraulic medium contacts the load-bearing structure of the nozzle (404) to provide hydraulic pressure, thereby driving the nozzle (404) toward the retracted position. The first pressure chamber (403) is an open cavity, which allows the force application component to push the internal hydraulic medium to provide hydraulic pressure. The cleaning head (4) is provided with a channel (418) for the flushing medium to enter. The flushing medium acts at least partially on the load-bearing structure of the nozzle (404) through the channel (418), causing the nozzle (404) to tend to move toward the extended position.

2. The pipe inner wall cleaning device according to claim 1, characterized in that, The support rod (5) is set horizontally. The pipe inner wall cleaning device also includes an elastic pre-tightening member (7) which is set inside the support rod (5). The elastic pre-tightening member (7) connects the support rod (5) and the movable frame (8) and applies a pre-tightening force to the support rod (5).

3. The pipe inner wall cleaning device according to claim 2, characterized in that, The elastic pretensioner (7) is arranged along the length of the support rod (5), and the elastic pretensioner (7) is set at an inclined angle relative to the axis of the support rod (5).

4. The pipe inner wall cleaning device according to claim 1, characterized in that, The support frame includes a first support frame (1) and a second support frame (3) arranged opposite to each other, and the pipe limiting mechanism includes: Two spaced axial limiting mechanisms (19) are respectively installed on the first support frame (1) and the second support frame (3) to limit the axial displacement of the pipe (2) during cleaning; A clamping mechanism (20), mounted on the first support frame (1) and / or the second support frame (3), is used to limit the vertical movement of the pipe (2).

5. The pipe inner wall cleaning device according to claim 4, characterized in that: The axial limiting mechanism (19) includes: A fixing plate (191) is fixed to the corresponding support frame, and the fixing plate (191) is provided with a plurality of positioning holes (194). A rolling element (193) is disposed in the positioning hole (194). The rolling element (193) can rotate freely and roll in contact with the end of the pipe (2) to allow the pipe (2) to rotate while restricting the axial displacement of the pipe (2).

6. The pipe inner wall cleaning device according to claim 5, characterized in that: The axial limiting mechanism (19) includes a cover plate (192), and the cover plate (192) is provided with a limiting groove (195) corresponding to the positioning hole (194). The rolling element (193) is installed in the space formed by the positioning hole (194) and the limiting groove (195).

7. The pipe inner wall cleaning device according to claim 4, characterized in that: The clamping mechanism (20) includes: The drive unit (201) is mounted on the corresponding support frame; The clamping member (203) is connected to the driving member (201) in a transmission manner. The driving member (201) drives the clamping member (203) to approach or move away from the surface of the pipe (2). The clamping member (203) can roll as the pipe (2) rotates.

8. The pipe inner wall cleaning device according to claim 1, characterized in that: It also includes a pipe driving mechanism, which includes a driving source (16), a first driving wheel (17) and a second driving wheel (18). The rotation axis of the first driving wheel (17) is parallel to the axis of the pipe (2) to drive the pipe (2) to rotate around its own axis. The rotation axis of the second driving wheel (18) forms an angle with the axis of the pipe (2) on the horizontal plane to drive the pipe (2) to move along its own axis. The driving source (16) drives at least one of the first driving wheel (17) and the second driving wheel (18) to rotate.

9. The pipe inner wall cleaning device according to claim 1, characterized in that: It also includes a flushing medium supply mechanism (9), which is connected to the cleaning head (4) via a flushing medium pipeline (6); The movable frame (8) is provided with a guide chain (13), and the flushing medium pipeline (6) passes through the guide chain (13) and the support rod (5) and then connects to the cleaning head (4).

10. The pipe inner wall cleaning device according to claim 1, characterized in that, It also includes a flushing medium circulation system, which comprises: A collection tank (12) is located below the support frame and is used to collect the rinsing medium and impurities after cleaning. The filtration mechanism (11) is connected to the collection tank (12) and is used to filter the collected rinsing medium; The liquid storage tank (10) is connected to the filtration mechanism (11) and is used to store the filtered rinsing medium for recycling.

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