Stainless steel pipe polishing device

Abstract

A stainless steel pipe polishing device relates to the technical field of stainless steel pipe polishing, is used for polishing the inner wall of a round stainless steel pipe fitting, and comprises a polishing wheel, a rotation driving mechanism, a feeding sliding table, a carrier roller and a hydraulic centering mechanism, the rotation driving mechanism is fixedly connected with the polishing wheel to drive the polishing wheel to rotate, and the rotation driving mechanism is installed on the feeding sliding table and can ascend or descend. The feeding sliding table can slide front and back to drive the polishing wheel to stretch into or retreat from the pipe fitting, the carrier roller is used for bearing and driving the pipe fitting to rotate, the hydraulic centering mechanism comprises a pipe pressing assembly, a lifting assembly and a quantitative driving assembly, the pipe pressing assembly is used for pressing the pipe fitting from the position over the pipe fitting, and the lifting assembly is used for lifting the pipe fitting. The lifting assembly is used for driving the rotation driving mechanism and the polishing wheel to ascend or descend. The quantitative driving assembly is used for driving the pipe pressing assembly and the lifting assembly. After the pipe fitting is fed to the carrier roller, the polishing wheel can be automatically aligned to the center of the pipe fitting, the time needed by manual adjustment is shortened, and the polishing operation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of metal polishing technology, and more specifically to a stainless steel tube polishing device. Background Technology

[0002] After stainless steel pipes are manufactured, they require surface treatment, and polishing is one of the common surface treatment processes. Some stainless steel pipes require polishing not only on the outer surface but also on the inner surface; internal polishing is a process used to improve the smoothness and quality of the inner surface of the stainless steel pipe. Current technology typically uses specialized internal polishing tools, such as polishing wheels or rotating brushes with flexible grinding heads. These are aligned with the center of the stainless steel pipe and inserted into the inner wall for polishing by rotating and pushing. However, when polishing stainless steel pipes of different diameters using polishing wheels, operators often need to manually adjust the equipment based on experience and visual observation to ensure the center of the polishing wheel is aligned with the center of the stainless steel pipe. This often requires a significant amount of time for repeated adjustments, resulting in low polishing efficiency. Summary of the Invention

[0003] In view of this, the present invention provides a stainless steel pipe polishing device, which can automatically align the polishing wheel with the center of the pipe, thereby reducing the time required for manual adjustment and improving the efficiency of polishing operations.

[0004] To achieve the above objectives, the present invention provides the following technical solutions.

[0005] A stainless steel pipe polishing device is used to polish the inner wall of a circular stainless steel pipe fitting. It includes a polishing wheel, a drive mechanism, a feed slide, a support roller, and a hydraulic centering mechanism. The drive mechanism is fixedly connected to the polishing wheel to drive its rotation. The drive mechanism is mounted on the feed slide and can rise or fall. The feed slide can slide back and forth to drive the polishing wheel into or out of the pipe fitting. The support roller supports and drives the pipe fitting to rotate. The hydraulic centering mechanism includes: A pipe clamping assembly for clamping the pipe fitting from directly above includes a pipe clamping wheel, a pipe clamping cylinder, and a pipe clamping line. The pipe clamping wheel is used to contact the pipe fitting and is rotatable. The pipe clamping cylinder is connected to the pipe clamping wheel to drive the pipe clamping wheel to rise or fall. Lifting components, including lifting cylinders, are used to drive the drive mechanism and polishing wheel to rise or fall; A quantitative drive assembly is used to drive the pressing assembly and the lifting assembly. It includes a quantitative hydraulic cylinder, which is connected to the pressing cylinder and the lifting cylinder respectively. The quantitative hydraulic cylinder is connected to the pressing cylinder through the pressing pipeline. Before the pipe is fed to the idler roller, the hydraulic oil in the quantitative hydraulic cylinder can drive the pressing wheel to descend to the position of the bottom of the pipe after it has been fed to the idler roller. After the pipe fitting is fed onto the idler roller, the bottom end of the pipe fitting is aligned with the center of the polishing wheel. The metering cylinder first presses hydraulic oil into the pressing cylinder to drive the pressing wheel to descend. After the pressing wheel descends and contacts the pipe fitting, the metering cylinder then presses hydraulic oil into the lifting cylinder to drive the drive mechanism and polishing wheel to rise. After all the remaining oil in the metering cylinder is pressed into the lifting cylinder, the drive mechanism and polishing wheel are driven to rise by half the outer diameter of the pipe fitting, so that the center of the polishing wheel is aligned with the center of the pipe fitting. The feed slide drives the polishing wheel to extend into the pipe fitting for polishing.

[0006] After the pipe fitting is loaded, its bottom end is aligned with the center of the polishing wheel. Since the driving mechanism and the polishing wheel are relatively heavy, when the quantitative oil cylinder presses the hydraulic oil, the hydraulic oil will first go through the pressure pipe with a relatively smaller load. In other cases, valves can also be set to control the pressurization sequence of the hydraulic oil. The metering cylinder first drives the pressure roller to descend until it contacts the pipe fitting. At this point, the remaining stroke of the pressure roller is equal to the outer diameter of the pipe fitting. After contacting the pipe fitting, the pressure roller cannot descend further, and the pressure roller cylinder cannot continue to supply oil. The remaining hydraulic oil in the metering cylinder is then pumped to the lifting cylinder, which in turn drives the drive mechanism and polishing wheel to rise from the bottom of the pipe fitting. By selecting appropriate parameters such as the volume and stroke of the lifting cylinder, the remaining oil in the metering cylinder is just enough to drive the lifting cylinder to a stroke equal to half the outer diameter of the pipe fitting. That is, the stroke driving the drive mechanism and polishing wheel to rise is equal to the radius of the pipe fitting. This causes the center of the polishing wheel to rise from the bottom of the pipe fitting by the radius of the pipe fitting, thus aligning it with the center of the pipe fitting. Then, the feed slide drives the polishing wheel to extend into the pipe fitting for polishing. The entire process is hydraulically controlled, enabling the polishing wheel to automatically align with the center of the pipe fitting, which helps reduce the time required for manual adjustment and improves the efficiency and quality of the polishing operation.

[0007] Furthermore, the hydraulic centering mechanism also includes a positioning assembly, which comprises: A synchronous cylinder is located below the roller and is equipped with a synchronous piston rod. The synchronous piston rod is used to contact the pipe from directly below, and its upper end face is flush with the center of the polishing wheel in the initial position. The positioning cylinder is connected to the quantitative cylinder and is connected to the drive mechanism to drive the drive mechanism and polishing wheel to rise or fall. It is also fixedly connected to the upper end of the lifting cylinder so that the lifting cylinder can drive the positioning cylinder, drive mechanism and polishing wheel to rise or fall. The positioning pipeline connects the positioning cylinder and the synchronization cylinder respectively, so that the positioning cylinder can drive the synchronization piston rod to rise or fall. Before the pipe fitting is fed onto the idler roller, the hydraulic oil in the metering cylinder can drive the pressure roller to descend just to contact the upper end face of the synchronous piston rod; After the pipe fitting is fed onto the idler roller, the metering cylinder first presses hydraulic oil into the pressing cylinder to drive the pressing wheel to descend. After the pressing wheel descends and contacts the pipe fitting, the metering cylinder then presses hydraulic oil into the positioning cylinder to drive the drive mechanism and polishing wheel to rise. The positioning cylinder drives the synchronous piston rod to rise synchronously to contact the pipe fitting through the positioning pipeline, so that the center of the polishing wheel is aligned with the bottom end of the pipe fitting. Finally, the metering cylinder presses hydraulic oil into the lifting cylinder to drive the positioning cylinder, drive mechanism, and polishing wheel to rise. After all the remaining oil in the metering cylinder is pressed into the lifting cylinder, the stroke of the positioning cylinder, drive mechanism, and polishing wheel is half the outer diameter of the pipe fitting, so that the center of the polishing wheel is aligned with the center of the pipe fitting. The feed slide drives the polishing wheel to extend into the pipe fitting for polishing.

[0008] When pipes of different sizes are fed onto the idler rollers, their bottom ends will be at different positions. This causes the center of the polishing wheel to be at different heights from the bottom end of the pipe, further preventing the polishing wheel from aligning with the center of the pipe after it rises to the required radius. By setting a positioning component, the center of the polishing wheel is first driven by a positioning cylinder to align with the bottom end of the pipe before being driven to rise to the required radius. This determines the reference height for the subsequent rise of the polishing wheel. The remaining stroke between the pressure wheel and the synchronous piston rod at this point is the outer diameter of the pipe. Therefore, when internal polishing of pipes of different sizes is required, the center of the polishing wheel can adaptively remain flush with the bottom end of different pipes, ensuring that it can rise correctly to align with the center of the pipe, thus improving the accuracy and versatility of the device.

[0009] Furthermore, both the pressure-reducing pipeline and the positioning pipeline are equipped with pressure-reducing valves, which include: The pressure reducing valve body has a pressure reducing valve chamber, an oil inlet chamber, an oil outlet chamber, an oil inlet channel, and a one-way channel inside. The two ends of the oil inlet channel are connected to the oil inlet chamber and the oil outlet chamber, respectively. The oil outlet chamber is connected to the pressure reducing valve chamber. The one-way channel is equipped with a one-way valve core. The conduction direction of the one-way channel is from the oil outlet chamber to the oil inlet chamber. The pressure reducing valve core is slidably connected to the pressure reducing valve cavity and extends into the oil inlet channel, so that it can open or close the oil inlet channel by sliding out or retracting. A pressure-reducing spring, which is connected to the pressure-reducing valve core, to provide the elastic force required for the pressure-reducing valve core to return to its original position and extend. When the metering cylinder pumps hydraulic oil into the pressure cylinder, the hydraulic oil enters the pressure reducing valve located in the pressure pipeline from the inlet chamber and flows out from the outlet chamber. After the pressure roller descends to contact the pipe fitting, the pressure cylinder stops pumping oil. When the oil pressure in the outlet chamber is greater than the spring force of the pressure reducing spring, the hydraulic oil in the outlet chamber is forced into the pressure reducing valve chamber to push the pressure reducing valve core to retract and block the oil inlet channel, thus closing the pressure pipeline. When the positioning cylinder presses hydraulic oil into the synchronizing cylinder, the hydraulic oil enters the pressure reducing valve located in the positioning pipeline from the oil inlet chamber and flows out from the oil outlet chamber. After the synchronizing piston rod rises to contact the pipe, the synchronizing cylinder stops feeding oil. When the oil pressure in the oil outlet chamber is greater than the elastic force of the pressure reducing spring, the hydraulic oil in the oil outlet chamber is forced into the pressure reducing valve chamber to push the pressure reducing valve core to retract and block the oil inlet channel, and the positioning pipeline is closed. When the quantitative hydraulic cylinder retracts hydraulic oil, the hydraulic oil in the pressure reducing valve located in the pressure line and the positioning line both enter from the oil outlet chamber and flow to the oil inlet chamber through the one-way channel to be drawn out and reset the pressure reducing valve body. When the oil pressure in the oil outlet chamber is less than the elastic force of the pressure reducing spring, the pressure reducing spring pushes the pressure reducing valve core to reset and extend to reopen the oil inlet channel.

[0010] Because the pressure output by the metering cylinder needs to increase significantly to overcome the gravity of the drive mechanism, polishing wheel, and positioning cylinder to lift them, this pressure is also transmitted through the pipeline to the pressure roller and synchronizing piston rod. This causes the pressure roller and synchronizing piston rod to also forcefully squeeze the pipe fitting, which may deform thin-walled pipe fittings. By installing pressure reducing valves in the pressure and positioning pipelines, the corresponding pipelines can be closed after the pressure roller and synchronizing piston rod are in position, thereby preventing the pressure from the metering cylinder from continuing to be transmitted to the pipe fitting and causing it to be squeezed and deformed.

[0011] Furthermore, the hydraulic alignment mechanism also includes a hydraulic oil sequence valve, which is used to control the sequence of hydraulic oil delivery by the quantitative hydraulic cylinder. The quantitative hydraulic cylinder is connected to the pressure cylinder, positioning cylinder and lifting cylinder respectively through the hydraulic oil sequence valve. The hydraulic sequence valve includes: The sequence valve body has a sequence valve chamber inside that is connected to a quantitative oil cylinder. The sequence valve chamber has a first oil port and a second oil port. The first oil port is connected to a positioning oil cylinder and a pressure pipe oil cylinder, and the second oil port is connected to a lifting oil cylinder. The sequence valve core is slidably connected in the sequence valve chamber so that it can block or open the first oil port and the second oil port by sliding. A return spring, which is connected to the sequence valve spool, provides the elastic force required for the sequence valve spool to return to its original position. The lifting cylinder is equipped with a return oil pipeline for one-way return oil to the metering cylinder, and its conduction direction is from the lifting cylinder to the metering cylinder; When the metering cylinder presses hydraulic oil, the sequence valve core opens the first oil port and blocks the second oil port. The hydraulic oil is first pressed to the pressure cylinder through the first oil port. After the pressure wheel is driven down to contact the pipe fitting, the metering cylinder presses the hydraulic oil to the positioning cylinder to drive the synchronous piston rod, the drive mechanism and the polishing wheel to rise. After the synchronous piston rod rises to contact the pipe fitting, the oil pressure in the sequence valve chamber increases. The hydraulic oil in the sequence valve chamber overcomes the elastic force of the return spring and pushes the sequence valve core to open the second oil port and block the first oil port, so that the hydraulic oil is finally pressed to the lifting cylinder. When the quantitative hydraulic cylinder retracts hydraulic oil, the return spring pushes the sequence valve core to reset, opening the first oil port and closing the second oil port. Hydraulic oil in the synchronization cylinder is drawn back to the positioning cylinder. Hydraulic oil in the pipe-pressing cylinder and the positioning cylinder is drawn back to the quantitative hydraulic cylinder through the first oil port. Hydraulic oil in the lifting cylinder is drawn back to the quantitative hydraulic cylinder through the return oil line. The pipe-pressing cylinder, positioning cylinder, and lifting cylinder must operate in sequence. If the sequence is disrupted, it will be impossible to align the center of the polishing wheel with the center of the pipe fitting. Hydraulic oil typically flows to areas of lower resistance; therefore, under normal circumstances, the operating sequence of the pipe-pressing cylinder, positioning cylinder, and lifting cylinder will not be disrupted. However, to avoid accidents, a hydraulic sequence valve is installed to control their operating sequence, ensuring this order.

[0012] Furthermore, the crimp assembly also includes: A buffer cylinder is provided with a buffer piston rod, which can slide up and down and is fixedly connected to the pressure pipe cylinder. Locking component, used to lock the crimping cylinder, preventing the crimping cylinder from rising or falling; Before the pressure roller contacts the fitting, the locking assembly locks the pressure cylinder. After the pressure roller contacts the fitting, the locking assembly unlocks the pressure cylinder, allowing the pressure cylinder to push the buffer piston rod upward to compress the air in the buffer cylinder, or to extend the buffer piston rod downward, as the pressure roller rises or falls with the surface of the fitting. The outer surface of the fitting may not be completely flat, and its surface may have undulations. Since hydraulic oil is not easily compressed, the pressure roller rigidly presses against the fitting. Therefore, during the rotation of the fitting, collisions, jamming, or even damage to the product or equipment may occur between the pressure roller and the fitting. By connecting the pressure cylinder with a buffer cylinder, utilizing the principle that gas is easily compressible, the pressure roller, when encountering undulations, can compress the buffer cylinder upward or downward to a certain extent while maintaining contact. This ensures flexible contact between the pressure roller and the fitting, thus preventing collisions or damage due to unevenness on the outer surface of the fitting.

[0013] Furthermore, the locking assembly includes two fixed solenoid valves. These two valves lock the buffer piston rod in the middle position of the buffer cylinder from both above and below. Before the pressure roller contacts the pipe fitting, the two fixed solenoid valves lock the buffer piston rod to prevent it from sliding up and down. After the pressure roller contacts the pipe fitting, the two fixed solenoid valves unlock the buffer piston rod. When the pressure roller rises or falls with the surface of the pipe fitting, the fixed solenoid valves unlock the buffer piston rod, allowing the pressure cylinder to push the buffer piston rod upward to compress the air in the buffer cylinder, or to extend the buffer piston rod. The air in the buffer cylinder acts as a buffer, similar to a shock absorber in a car. When the surface of the pipe fitting is uneven or there is slight displacement during processing, the buffer cylinder can absorb the impact force generated by these changes. Before the pressure roller contacts the pipe fitting, two fixed solenoid valves lock the buffer piston rod from the top and bottom directions respectively. The buffer piston rod will not descend due to its own weight and the weight of the pressure assembly, thus avoiding affecting the operation of the hydraulic centering mechanism. It also prevents the buffer piston rod from being accidentally driven to the upper limit position of the buffer cylinder. When the buffer piston rod is at the upper limit position in the buffer cylinder, it means that the buffer piston rod can no longer rise. At this time, the buffer cylinder cannot play a buffering role.

[0014] Furthermore, the positioning assembly also includes a lifting cylinder, a lifting platform, and a guide frame. The guide frame is fixedly located below the idler roller, and the lifting platform is slidably connected to the guide frame. The lifting cylinder is connected to the lifting platform to drive the lifting platform to rise and fall. A synchronizing cylinder is mounted on the lifting platform. After the feed slide drives the polishing wheel to extend into the pipe, the lifting cylinder drives the lifting platform to fall, thereby causing the synchronizing piston rod to disengage from the pipe. Since the pressure cylinder, positioning cylinder, and lifting cylinder still need to maintain pressure after the polishing wheel extends into the pipe, the synchronizing cylinder cannot lower the synchronizing piston rod by depressurizing. By separately setting up a lifting cylinder, lifting platform, and guide frame to drive the synchronizing cylinder and synchronizing piston rod to rise and fall, the synchronizing piston rod can be driven to fall by the lifting cylinder after the polishing wheel extends into the pipe, thereby disengaging from the pipe and preventing the pipe from colliding with the synchronizing piston rod during rotation.

[0015] Furthermore, the stainless steel pipe polishing device of the present invention also includes a shaft support mechanism. The drive mechanism includes a drive motor, a drive shaft, and a bushing. The drive motor is fixedly connected to the drive shaft, the drive shaft is fixedly connected to the polishing wheel, and the bushing is sleeved outside the drive shaft and rotatably connected to the drive shaft. The shaft support mechanism includes: Support rollers are used to support the drive shaft; The lifting slide rail is located on both sides of the drive shaft, and the support rollers are slidably connected to the lifting slide rail; The roller lifting assembly is used to drive the support rollers to rise or fall. The locking wheel assembly is used to lock the support wheel, preventing it from rising or falling. When the drive mechanism rises or falls, the locking wheel assembly unlocks the supporting wheel, and the supporting wheel lifting assembly drives the supporting wheel to rise or fall synchronously with the drive shaft. When the drive mechanism stops rising or falling, the locking wheel assembly locks the supporting wheel so that the supporting wheel continues to support the drive shaft.

[0016] The drive shaft is typically quite long, with one end fixed to the drive motor and the rest suspended in the air. Due to its own weight and the centrifugal force generated during rotation, the drive shaft is prone to vibration, affecting the stability of the device and resulting in poor polishing performance. Furthermore, the suspended portion of the drive shaft is susceptible to bending and deformation due to prolonged exposure to its own weight and external forces during operation, and may even experience fatigue fracture. By incorporating a shaft support mechanism to provide support for the suspended portion of the drive shaft, bending can be prevented, thereby improving the stability of the device and the polishing effect.

[0017] Furthermore, the support roller lifting assembly includes a counterweight, a fixed pulley, and a connecting belt. The fixed pulley is fixed to the upper end of the lifting slide rail. One end of the connecting belt is connected to the counterweight, and the other end passes around the fixed pulley and connects to the support roller. The locking roller assembly includes a locking roller cylinder, a locking roller piston rod, a locking roller solenoid valve, and a self-locking pipeline. The locking roller piston rod is fixedly connected to the support roller and slidably connected inside the locking roller cylinder to allow it to slide up and down. The locking roller piston rod divides the inside of the locking roller cylinder into upper and lower chambers, and the self-locking pipeline connects to the two chambers respectively. The locking wheel solenoid valve is located in the self-locking pipeline to open and close the self-locking pipeline. When the drive shaft rises, the locking wheel solenoid valve opens the self-locking pipeline, allowing the hydraulic oil in the two chambers to flow freely, so that the locking wheel piston rod can slide up and down, and the counterweight can descend to drive the support wheel to rise synchronously with the drive shaft. After the drive shaft stops rising, the locking wheel solenoid valve closes the self-locking pipeline, the hydraulic oil in the two chambers cannot flow, and the locking wheel piston rod and the support wheel are locked so that the support wheel keeps supporting the drive shaft.

[0018] Furthermore, the effective piston area ratio of the pressure cylinder, synchronization cylinder, positioning cylinder, and lifting cylinder is 1:1:1:2. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the stainless steel tube polishing device of the present invention.

[0020] Figure 2 This is a three-dimensional structural schematic diagram of the stainless steel tube polishing device of the present invention from another perspective.

[0021] Figure 3 This is a three-dimensional structural diagram of the stainless steel pipe polishing device of the present invention, after concealing the idler roller, feed slide, and frame.

[0022] Figure 4 for Figure 3A front view of the stainless steel pipe polishing device under certain conditions.

[0023] Figure 5 for Figure 3 A cross-sectional view of a stainless steel pipe polishing device under certain conditions.

[0024] Figure 6 for Figure 5 Enlarged diagram of point A in the middle.

[0025] Figure 7 for Figure 5 Enlarged diagram of point B in the middle.

[0026] Figure 8 for Figure 4 A cross-sectional view of a stainless steel pipe polishing device along the CC direction under the condition of being in operation.

[0027] Figure 9 for Figure 8 Enlarged diagram of point E in the middle.

[0028] Figure 10 for Figure 4 A cross-sectional view of the stainless steel pipe polishing device along the DD direction under the condition.

[0029] Figure 11 for Figure 10 Enlarged schematic diagram at point F in the middle.

[0030] The reference numerals in the figures include: Drive mechanism 1, drive motor 11, drive shaft 12, bushing 13; Pipe pressing assembly 2, pipe pressing cylinder 21, pipe pressing wheel 22, pipe pressing pipeline 23, buffer cylinder 24, buffer piston rod 241, fixed solenoid valve 25; Positioning cylinder 3, synchronizing cylinder 31, synchronizing piston rod 32, lifting cylinder 33, lifting platform 34, guide frame 35, positioning pipeline 36; Lifting cylinder 4, return oil line 41; Pressure reducing valve 5, pressure reducing valve body 51, pressure reducing valve chamber 511, oil inlet chamber 512, oil outlet chamber 513, oil inlet channel 514, one-way channel 515, one-way valve core 5151, pressure reducing valve core 52, pressure reducing spring 53. Oil pressure sequence valve 6, sequence valve body 61, sequence valve chamber 611, first oil port 6111, second oil port 6112, sequence valve core 62, return spring 63; Supporting shaft mechanism 7, supporting roller 71, connecting block 711, lifting slide rail 72, counterweight block 73, fixed pulley 74, connecting belt 75, locking wheel cylinder 76, locking wheel piston rod 77, locking wheel solenoid valve 78, self-locking pipeline 79. 8. Metering cylinder; 9. Polishing wheel; 10. Feed slide; 14 idler rollers, 15 frame, 151 support bracket, 16 pipe fittings. Detailed Implementation

[0031] The invention will be described in detail below with reference to specific embodiments.

[0032] Combination Figure 1 and Figure 2 The stainless steel pipe polishing device of Example 1 includes a polishing wheel 9, a drive mechanism 1, a feed slide 10, a support roller 14, a frame 15, and a hydraulic centering mechanism, combined with Figure 3 and Figure 5 The drive mechanism 1 includes a drive motor 11, a drive shaft 12, and a bushing 13. The drive motor 11 is fixedly connected to the drive shaft 12, and the drive shaft 12 is fixedly connected to the polishing wheel 9. The bushing 13 is sleeved on the drive shaft 12 and is rotatably connected to the drive shaft 12 through a bearing. The drive motor 11 is mounted on the feed slide 10 and is slidably connected to the feed slide 10 through a guide rod so that it can rise or fall. The feed slide 10 is slidably connected to the frame 15 so that it can drive the polishing wheel 9 to extend into or out of the tube 16. The roller 14 is used to support and drive the tube 16 to rotate. The frame 15 is provided with a bracket 151.

[0033] Combination Figures 1-5 The hydraulic centering mechanism includes a pipe pressing assembly 2, a positioning assembly, a lifting assembly, and a quantitative drive assembly. The pipe pressing assembly 2 is mounted on the bracket 151 and includes a pipe pressing wheel 22, a pipe pressing cylinder 21, and a pipe pressing pipe 23. The pipe pressing wheel 22 is located directly above the pipe fitting 16 and can rotate. The pipe pressing cylinder 21 is connected to the pipe pressing wheel 22 to drive the pipe pressing wheel 22 to rise or fall. The positioning assembly includes a synchronizing cylinder 31, a positioning cylinder 3, and a positioning pipe 36. The synchronizing cylinder 31 is located below the idler roller 14 and has a synchronizing piston rod 32. The synchronizing piston rod 32 is used to contact the pipe fitting 16 from directly below. Figure 4As shown, in the initial position, the upper end face of the synchronous piston rod 32 is flush with the center of the polishing wheel 9 (dashed line). The positioning cylinder 3 is connected to the drive motor 11 to drive the drive mechanism 1 and the polishing wheel 9 to rise or fall. The lifting assembly includes a lifting cylinder 4, and the positioning cylinder 3 is installed on the upper end of the lifting cylinder 4, so that the lifting cylinder 4 can drive the positioning cylinder 3, the drive mechanism 1, and the polishing wheel 9 to rise or fall. The positioning pipe 36 is connected to the positioning cylinder 3 and the synchronous cylinder 31 respectively, so that the positioning cylinder 3 can drive the synchronous piston rod 32 to rise or fall. The quantitative drive assembly includes a quantitative cylinder 8, which is connected to the pressure pipe cylinder 21, the positioning cylinder 3, and the lifting cylinder 4 respectively. The quantitative cylinder 8 is connected to the pressure pipe cylinder 21 through the pressure pipe 23 and to the positioning cylinder 3 through the positioning pipe 36. Among them, the effective piston area ratio of the hydraulic cylinder 21, the synchronizing hydraulic cylinder 31, the positioning hydraulic cylinder 3 and the lifting hydraulic cylinder 4 is 1:1:1:2. The effective piston area ratio represents the ratio of the piston rod stroke of the cylinder under the same injection or extraction of the same amount of oil.

[0034] Before the pipe fitting 16 is fed onto the idler roller 14, the hydraulic oil level in the metering cylinder 8 is set just high enough to drive the pressure roller 22 down to contact the upper end of the synchronous piston rod 32. After the pipe fitting 16 is fed onto the idler roller 14, the metering cylinder 8 first pumps hydraulic oil to the pressure roller 21 with the least load to drive the pressure roller 22 down. After the pressure roller 22 down to contact the pipe fitting 16, the metering cylinder 8 then pumps hydraulic oil to the positioning cylinder 3 with a relatively small load, causing the drive mechanism 1 and the polishing wheel 9 to rise. At the same time, the positioning cylinder 3 drives the synchronous piston rod 32 to rise synchronously through the positioning pipe 36 until it contacts the pipe fitting 16. At this time, the center of the polishing wheel 9 is aligned with the bottom end of the pipe fitting 16, and the remaining stroke between the pressure roller 22 and the synchronous piston rod 32 is the outer diameter of the pipe fitting 16. Finally, the metering cylinder 8 pressurizes hydraulic oil to the lifting cylinder 4, which is under the heaviest load, causing the positioning cylinder 3, the drive mechanism 1, and the polishing wheel 9 to rise. After all the remaining oil in the metering cylinder 8 is pressurized to the lifting cylinder 4, due to the effective piston area ratio of the above cylinders, the stroke of the positioning cylinder 3, the drive mechanism 1, and the polishing wheel 9 being driven to rise is half of the remaining stroke between the pressure roller 22 and the synchronous piston rod 32, which is the size of the radius of the pipe fitting 16. This makes the center of the polishing wheel 9 aligned with the center of the pipe fitting 16, and the feed slide 10 drives the polishing wheel 9 to extend into the pipe fitting 16 for polishing.

[0035] Hydraulic oil flows under the action of pressure difference. When there are different paths in the system, the hydraulic oil tends to flow to the place with relatively less resistance. Since the drive mechanism 1, polishing wheel 9 and metering cylinder 8 all have a certain weight, the resistance is relatively large for metering cylinder 8. Therefore, when metering cylinder 8 presses hydraulic oil, the hydraulic oil will first go through the pressure pipe 23 with the least load, then be pressed to the positioning cylinder 3 with the least load, and finally be pressed to the lifting cylinder 4 with the greatest load. In other cases, the pressing sequence of hydraulic oil can also be controlled by setting valves. When the pressure roller 22 descends to contact the pipe fitting 16 and the synchronous piston rod 32 rises to contact the pipe fitting 16, the center of the polishing wheel 9 aligns with the bottom end of the pipe fitting 16. The remaining stroke between the pressure roller 22 and the synchronous piston rod 32 is the outer diameter of the pipe fitting 16. With a constant hydraulic oil volume, the stroke of the cylinder is inversely proportional to the effective piston area. By setting the effective piston area ratio of the pressure cylinder 21, synchronous cylinder 31, positioning cylinder 3, and lifting cylinder 4 to 1:1:1:2, the pressure roller... When the remaining stroke between wheel 22 and synchronous piston rod 32 is equal to the outer diameter of pipe 16, the metering cylinder 8 pressurizes the remaining hydraulic oil into the lifting cylinder 4, which has twice the effective piston area. At this time, the lifting cylinder 4 can drive the polishing wheel 9 to rise to half the outer diameter of pipe 16, i.e., the radius of pipe 16. This allows the center of the polishing wheel 9 to rise from the bottom of pipe 16 to a height equal to the radius of pipe 16, aligning with the center of pipe 16. Then, the feed slide 10 drives the polishing wheel 9 to extend into pipe 16 for polishing. The entire process is hydraulically controlled, enabling the polishing wheel 9 to automatically align with the center of pipe 16, reducing the time required for manual adjustment and improving the efficiency and quality of polishing operations. When pipes 16 of different sizes are fed onto roller 14, their bottom positions will be different. This will cause the center of the polishing wheel 9 to be at different heights from the bottom of pipe 16, further preventing the polishing wheel 9 from aligning with the center of pipe 16 after rising to the radius of pipe 16. By using a positioning component, the center of the polishing wheel 9 is driven by the positioning cylinder 3 to rise to align with the bottom of the pipe 16 before being driven to rise to the radius of the pipe 16. This determines the reference height for the subsequent rise of the polishing wheel 9. Therefore, when internal polishing of pipes 16 of different sizes is required, the center of the polishing wheel 9 can also adaptively remain flush with the bottom of the different pipes 16, thereby ensuring that it can rise correctly to align with the center of the pipe 16, improving the accuracy and versatility of the device.

[0036] Of course, in the case of internal polishing of only one size of pipe fitting 16 for a long time, the positioning component can be omitted on the basis of this embodiment. By setting the center position of the polishing wheel 9 so that it is aligned with the bottom end of the pipe fitting 16 in the initial position, and then by selecting appropriate parameters such as the volume and stroke of the lifting cylinder 4, for example, making the effective piston area ratio of the pressing cylinder 21 and the lifting cylinder 4 1:2, the remaining oil in the metering cylinder 8 can be just enough to drive the lifting cylinder 4 to half the outer diameter of the pipe fitting 16, and the polishing wheel 9 can also be automatically aligned with the center of the pipe fitting 16.

[0037] Because the pressure output by the quantitative hydraulic cylinder 8 needs to increase to overcome the gravity of the drive mechanism 1, polishing wheel 9, and positioning cylinder 3 to lift them, this pressure is also transmitted through the pipeline to the pressure roller 22 and synchronous piston rod 32, causing the pressure roller 22 and synchronous piston rod 32 to also forcefully squeeze the pipe fitting 16. For pipe fittings 16 with thin walls, this may cause deformation. Figure 5 and Figure 6 In this embodiment, both the pressure pipe 23 and the positioning pipe 36 are equipped with pressure reducing valves 5. The pressure reducing valve 5 includes a pressure reducing valve body 51, a pressure reducing valve core 52, and a pressure reducing spring 53. The pressure reducing valve body 51 is provided with a pressure reducing valve chamber 511, an oil inlet chamber 512, an oil outlet chamber 513, an oil inlet channel 514, and a one-way channel 515. The two ends of the oil inlet channel 514 are respectively connected to the oil inlet chamber 512 and the oil outlet chamber 513. The oil outlet chamber 513 is connected to the pressure reducing valve chamber 511. The one-way channel 515 is provided with a one-way valve core 5151. The conduction direction of the one-way channel 515 is from the oil outlet chamber 513 to the oil inlet chamber 512. The pressure reducing valve core 52 is slidably connected to the pressure reducing valve chamber 511 and extends into the oil inlet channel 514 so that it can open or close the oil inlet channel 514 by sliding out or retracting. The pressure reducing spring 53 is connected to the pressure reducing valve core 52 to provide the elastic force required for the pressure reducing valve core 52 to reset and extend.

[0038] When the metering cylinder 8 presses hydraulic oil into the pressure cylinder 21, the hydraulic oil enters the pressure reducing valve 5 located in the pressure pipe 23 from the inlet chamber 512 and flows out from the outlet chamber 513. After the pressure roller 22 descends to contact the pipe fitting 16, the pressure cylinder 21 stops supplying oil, and the oil pressure in the outlet chamber 513 begins to rise. When the pressure exceeds the spring force of the pressure reducing spring 53, the hydraulic oil in the outlet chamber 513 is forced into the pressure reducing valve chamber 511, pushing the pressure reducing valve core 52 to retract and block the inlet passage 514, thus closing the pressure pipe 23. When the position cylinder 3 presses hydraulic oil into the synchronizing cylinder 31, the hydraulic oil enters the pressure reducing valve 5 located in the positioning pipeline 36 from the inlet chamber 512 and flows out from the outlet chamber 513. After the synchronizing piston rod 32 rises to the contact pipe 16, the synchronizing cylinder 31 stops feeding oil, and the oil pressure in the outlet chamber 513 begins to rise. When it exceeds the elastic force of the pressure reducing spring 53, the hydraulic oil in the outlet chamber 513 is forced into the pressure reducing valve chamber 511 to push the pressure reducing valve core 52 to retract and block the oil inlet channel 514, and the positioning pipeline 36 is closed.

[0039] When the quantitative hydraulic cylinder 8 retracts hydraulic oil, the hydraulic oil in the pressure reducing valve 5 located in the pressure pipe 23 and the positioning pipe 36 both enter from the outlet chamber 513 and flow through the one-way channel 515 to the inlet chamber 512 to be drawn out and reset the pressure reducing valve body 51. When the oil pressure in the outlet chamber 513 is less than the elastic force of the pressure reducing spring 53, the pressure reducing spring 53 pushes the pressure reducing valve core 52 to reset and extend, thereby reopening the inlet channel 514. By setting pressure reducing valves 5 in the pressure pipe 23 and the positioning pipe 36, the corresponding pipes can be closed after the pressure roller 22 and the synchronous piston rod 32 are in position, thereby preventing the pressure of the quantitative hydraulic cylinder 8 from continuing to be transmitted to the fitting 16 and causing the fitting 16 to be squeezed and deformed. The compressive force borne by the fitting 16 is equal to the elastic force of the pressure reducing spring 53 when it is pushed. By selecting an appropriate elastic force, the compressive force borne by the fitting 16 can be selected.

[0040] The pressure cylinder 21, positioning cylinder 3, and lifting cylinder 4 need to operate in sequence. If the sequence is disrupted, it will be impossible to align the center of the polishing wheel 9 with the center of the fitting 16. Figure 5 and Figure 7The hydraulic alignment mechanism in this embodiment also includes a hydraulic sequence valve 6. The metering cylinder 8 is connected to the pipe pressing cylinder 21, the positioning cylinder 3, and the lifting cylinder 4 through the hydraulic sequence valve 6. The hydraulic sequence valve 6 includes a sequence valve body 61, a sequence valve core 62, and a return spring 63. The sequence valve body 61 has a sequence valve chamber 611 connected to the metering cylinder 8. The sequence valve chamber 611 has a first oil port 6111 and a second oil port 6112. The first oil port 6111 is connected to the positioning cylinder 3 and the pipe pressing cylinder 21, and the second oil port 6112 is connected to the lifting cylinder 4. The lifting cylinder 4 has a sequence valve core 62 slidably connected to the sequence valve chamber 611, which can block or open the first oil port 6111 and the second oil port 6112 by sliding. The sequence valve core 62 has a channel inside. When in the initial position, the channel connects the metering cylinder 8 and the first oil port 6111. The return spring 63 is connected to the sequence valve core 62 to provide the elastic force required for the sequence valve core 62 to reset. The lifting cylinder 4 is provided with a return oil pipeline 41 for unidirectional return oil to the metering cylinder 8. Its conduction direction is from the lifting cylinder 4 to the metering cylinder 8.

[0041] When the metering cylinder 8 presses hydraulic oil, the sequence valve core 62 opens the first oil port 6111 and blocks the second oil port 6112. The hydraulic oil is first pressed to the pressure cylinder 21 through the first oil port 6111. After the pressure roller 22 is driven down to the contact pipe 16, the metering cylinder 8 turns to press the hydraulic oil to the positioning cylinder 3 to drive the synchronous piston rod 32, the drive mechanism 1 and the polishing wheel 9 to rise. After the synchronous piston rod 32 rises to the contact pipe 16, the oil pressure in the sequence valve chamber 611 increases. The hydraulic oil in the sequence valve chamber 611 overcomes the elastic force of the return spring 63 to push the sequence valve core 62 to open the second oil port 6112 and block the first oil port 6111, so that the hydraulic oil is finally pressed to the lifting cylinder 4. When the fixed displacement cylinder 8 retracts hydraulic oil, the return spring 63 pushes the sequence valve core 62 to reset, opening the first oil port 6111 and closing the second oil port 6112. The hydraulic oil in the synchronization cylinder 31 is drawn back to the positioning cylinder 3. The hydraulic oil in the pressure cylinder 21 and the positioning cylinder 3 is drawn back to the fixed displacement cylinder 8 through the first oil port 6111. The hydraulic oil in the lifting cylinder 4 is drawn back to the fixed displacement cylinder 8 through the return oil line 41. Hydraulic oil typically flows to areas of lower resistance; therefore, under normal circumstances, the sequence of actions of the pressure cylinder 21, positioning cylinder 3, and lifting cylinder 4 will not be disrupted. However, to avoid accidents, the hydraulic sequence valve 6 is installed to control their sequence, thus ensuring this order.

[0042] The outer surface of the fitting 16 may not be completely flat; its surface may have undulations or slight deformation. The cross-section of the outer surface is not perfectly circular but somewhat elliptical. Since hydraulic oil is not easily compressed, and the pressure roller 22 maintains rigid pressure on the fitting 16, collisions, jamming, or even damage to the product or equipment may occur between the pressure roller 22 and the fitting 16 during rotation. Combined with... Figure 8 and Figure 9 The crimping assembly 2 in this embodiment also includes a buffer cylinder 24 and a locking assembly. The buffer cylinder 24 is provided with a buffer piston rod 241, which can slide up and down and is fixedly connected to the crimping cylinder 21. The locking assembly includes two fixed solenoid valves 25, which lock the buffer piston rod 241 in the middle position of the buffer cylinder 24 from the upper and lower directions respectively (the middle position between the fully retracted and fully extended position of the buffer piston rod 241), so that the crimping cylinder 21 cannot rise or fall when locked. Before the crimping wheel 22 contacts the fitting 16, the fixed solenoid valves 25 lock the buffer piston rod 241. After the crimping wheel 22 contacts the fitting 16, the fixed solenoid valves 25 unlock the buffer piston rod 241, so that when the crimping wheel 22 rises or falls with the surface of the fitting 16, the crimping cylinder 21 can push the buffer piston rod 241 upward to compress the air in the buffer cylinder 24, or drive the buffer piston rod 241 downward to extend. A buffer cylinder 24 is connected to the pressure cylinder 21. Utilizing the principle that gas is easily compressible, the pressure roller 22 acts as a buffer when encountering uneven surfaces, similar to a shock absorber in a car. When the surface of the pipe fitting 16 is uneven or there is slight displacement during processing, the buffer cylinder 24 absorbs the impact force generated by these changes, thus preventing collisions or damage to the pipe fitting 16 due to unevenness on its outer surface. Before the pressure roller 22 contacts the pipe fitting 16, two fixed solenoid valves 25 lock the buffer piston rod 241 from both above and below. The buffer piston rod 241 will not descend due to its own weight and the weight of the pressure assembly 2, thus avoiding interference with the hydraulic centering mechanism. It also prevents the buffer piston rod 241 from being accidentally driven to the upper limit position of the buffer cylinder 24. When the buffer piston rod 241 is at the upper limit position within the buffer cylinder 24, it means that the buffer piston rod 241 can no longer rise, and the buffer cylinder 24 cannot provide a buffering effect.

[0043] Because the polishing wheel 9 extends into the pipe fitting 16, the pressing cylinder 21, positioning cylinder 3, and lifting cylinder 4 still need to maintain pressure, causing the synchronizing cylinder 31 to be unable to lower the synchronizing piston rod 32 by releasing pressure. When the pipe fitting 16 is driven to rotate, it may rub or collide with the synchronizing piston rod 32. Figure 3 and Figure 8The positioning assembly in this embodiment also includes a lifting cylinder 33, a lifting platform 34, and a guide frame 35. The guide frame 35 is fixedly disposed below the idler roller 14. The lifting platform 34 is slidably connected to the guide frame 35. The lifting cylinder 33 is connected to the lifting platform 34 to drive the lifting platform 34 to rise and fall. The synchronous cylinder 31 is mounted on the lifting platform 34. After the feed slide 10 drives the polishing wheel 9 to extend into the pipe 16, the lifting cylinder 33 drives the lifting platform 34 to fall, thereby causing the synchronous piston rod 32 to disengage from the contact pipe 16. By additionally setting the lifting cylinder 33, the lifting platform 34, and the guide frame 35 to drive the synchronous cylinder 31 and the synchronous piston rod 32 to rise and fall, the synchronous piston rod 32 can be driven to fall by the lifting cylinder 33 after the polishing wheel 9 extends into the pipe 16, thereby disengaging from the contact pipe 16 and preventing the pipe 16 from rubbing or colliding with the synchronous piston rod 32 during rotation. Alternatively, a roller can be installed at the top of the synchronous piston rod 32, so that it does not need to be lowered. However, unlike the pressure roller 22, the synchronous piston rod 32 does not need to contact the tube 16 during the polishing process, so it is better to lower it to reduce an unnecessary contact point for the tube 16.

[0044] The drive shaft 12 is typically quite long, with one end fixed to the drive motor 11 and the rest suspended in the air. Due to its own weight and the centrifugal force generated during rotation, the drive shaft 12 is prone to vibration, affecting the stability of the device and resulting in poor polishing performance. Furthermore, due to prolonged exposure to its own weight and external forces during operation, the suspended portion of the drive shaft 12 is also susceptible to bending deformation and may even experience fatigue fracture. In conjunction with... Figure 3 , Figure 10 and Figure 11The stainless steel pipe polishing device in this embodiment also includes a shaft support mechanism 7. The shaft support mechanism 7 includes a support wheel 71, a lifting slide rail 72, a support wheel lifting assembly, and a locking wheel assembly. In this embodiment, there are two support wheels 71, which are connected by a connecting block 711. The support wheels 71 are slidably connected to the lifting slide rail 72, which is located on both sides of the drive shaft 12. The support wheel lifting assembly includes a counterweight block 73, a fixed pulley 74, and a connecting belt 75. The weight of the counterweight block 73 can be set according to the weight of the support wheel 71 and the drive mechanism 1. For example, it can provide support for the drive shaft 12 without tilting the drive shaft 12. A fixed pulley 74 is fixed to the upper end of the lifting slide rail 72. One end of the connecting belt 75 is connected to the counterweight 73, and the other end passes around the fixed pulley 74 and is connected to the support wheel 71. The locking wheel assembly includes a locking wheel cylinder 76, a locking wheel piston rod 77, a locking wheel solenoid valve 78, and a self-locking pipe 79. The locking wheel piston rod 77 is fixedly connected to the support wheel 71 and slidably connected to the locking wheel cylinder 76 so as to be able to slide up and down. The locking wheel piston rod 77 divides the inside of the locking wheel cylinder 76 into upper and lower chambers. The self-locking pipe 79 connects to the two chambers respectively. The locking wheel solenoid valve 78 is located in the self-locking... The self-locking pipe 79 can be opened and closed. When the drive shaft 12 rises, the locking wheel solenoid valve 78 opens the self-locking pipe 79, allowing the hydraulic oil in the two chambers to flow freely. This allows the locking wheel piston rod 77 to slide up and down, and the counterweight 73 to descend, driving the support wheel 71 to rise synchronously with the drive shaft 12. After the drive shaft 12 stops rising, the locking wheel solenoid valve 78 closes the self-locking pipe 79, preventing the hydraulic oil in the two chambers from flowing. The locking wheel piston rod 77 and the support wheel 71 are locked, keeping the support wheel 71 supporting the drive shaft 12. By setting the shaft support mechanism 7, support is provided for the part of the drive shaft 12 suspended in the air, preventing the drive shaft 12 from bending, thereby improving the stability of the device and the polishing effect.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions created by the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions created by the present invention without departing from the essence and scope of the technical solutions created by the present invention.

Claims

1. A stainless steel pipe polishing device, used for polishing the inner wall of a round stainless steel pipe, comprising a polishing wheel, a driving mechanism, a feed slide and a roller, wherein the driving mechanism is fixedly connected to the polishing wheel to drive the polishing wheel to rotate, the driving mechanism is mounted on the feed slide and can rise or fall, the feed slide can slide back and forth to drive the polishing wheel to extend into or exit the pipe, and the roller is used to support and drive the pipe to rotate, and is characterized in that: Also included is a hydraulic centering mechanism, which includes: A pipe pressing assembly is used to press the pipe fitting from directly above the pipe fitting, comprising a pipe pressing wheel, a pipe pressing cylinder and a pipe pressing pipeline, wherein the pipe pressing wheel is used to contact the pipe fitting and can rotate, and the pipe pressing cylinder is connected to the pipe pressing wheel to drive the pipe pressing wheel to rise or fall; A lifting assembly, including a lifting cylinder, is used to drive the driving mechanism and the polishing wheel to rise or fall; A quantitative drive assembly, used to drive the pipe pressing assembly and the lifting assembly, including a quantitative oil cylinder, which is respectively connected to the pipe pressing oil cylinder and the lifting oil cylinder, the quantitative oil cylinder is connected to the pipe pressing oil cylinder through a pipe pressing pipeline, and when the pipe fitting has not been loaded onto the roller, the hydraulic oil in the quantitative oil cylinder can drive the pipe pressing wheel to just drop to the bottom of the pipe fitting after the pipe fitting is loaded onto the roller; After the pipe fitting is loaded onto the roller, the bottom end of the pipe fitting is aligned with the center of the polishing wheel. The metering cylinder first presses hydraulic oil to the pipe pressing cylinder to drive the pipe pressing wheel to descend. After the pipe pressing wheel descends to contact the pipe fitting, the metering cylinder presses hydraulic oil to the lifting cylinder to drive the rotating mechanism and the polishing wheel to rise. After all the remaining oil in the metering cylinder is pressed to the lifting cylinder, the rotating mechanism and the polishing wheel are driven to rise by a stroke of half the outer diameter of the pipe fitting, so that the center of the polishing wheel is aligned with the center of the pipe fitting, and the feed slide drives the polishing wheel to extend into the pipe fitting for polishing.

2. The stainless steel pipe polishing device according to claim 1, characterized in that: The hydraulic centering mechanism also includes a positioning assembly, which includes: A synchronous oil cylinder is arranged below the roller and is provided with a synchronous piston rod, the synchronous piston rod is used to contact the pipe fitting from directly below, and its upper end surface is flush with the center of the polishing wheel in the initial position; The positioning cylinder is connected to the quantitative cylinder, the positioning cylinder is connected to the driving mechanism so as to be able to drive the driving mechanism and the polishing wheel to rise or fall, and is fixedly connected to the upper end of the lifting cylinder so that the lifting cylinder can drive the positioning cylinder, the driving mechanism and the polishing wheel to rise or fall; The positioning pipeline is connected to the positioning cylinder and the synchronous cylinder respectively, so that the positioning cylinder can drive the synchronous piston rod to rise or fall; When the pipe has not been loaded onto the roller, the hydraulic oil in the metering cylinder can drive the pipe pressing wheel to just drop down to contact the upper end surface of the synchronous piston rod; After the pipe fitting is loaded onto the roller, the metering cylinder first presses hydraulic oil to the pipe pressing cylinder to drive the pipe pressing wheel to descend. After the pipe pressing wheel descends to contact the pipe fitting, the metering cylinder presses hydraulic oil to the positioning cylinder again to drive the rotating mechanism and the polishing wheel to rise. The positioning cylinder drives the synchronous piston rod to rise synchronously to contact the pipe fitting through the positioning pipeline, so that the center of the polishing wheel is aligned with the bottom of the pipe fitting. Finally, the metering cylinder presses hydraulic oil to the lifting cylinder to drive the positioning cylinder, the rotating mechanism and the polishing wheel to rise. After all the remaining oil in the metering cylinder is pressed and sent to the lifting cylinder, the positioning cylinder, the rotating mechanism and the polishing wheel are driven to rise by a stroke of half the outer diameter of the pipe fitting, so that the center of the polishing wheel is aligned with the center of the pipe fitting, and the feed slide drives the polishing wheel to extend into the pipe fitting for polishing.

3. The stainless steel pipe polishing device according to claim 2, characterized in that: Both the pressure pipe and the positioning pipe are equipped with pressure reducing valves, which include: The pressure reducing valve body is provided with a pressure reducing valve cavity, an oil inlet cavity, an oil outlet cavity, an oil inlet passage and a one-way passage. The two ends of the oil inlet passage are connected to the oil inlet cavity and the oil outlet cavity respectively. The oil outlet cavity is connected to the pressure reducing valve cavity. A one-way valve core is provided in the one-way passage. The conducting direction of the one-way passage is from the oil outlet cavity to the oil inlet cavity. A pressure reducing valve core is slidably connected to the pressure reducing valve cavity and extends into the oil inlet passage so as to be able to open or block the oil inlet passage by sliding out or retracting; A pressure reducing spring connected to the pressure reducing valve core to provide the elastic force required for the pressure reducing valve core to return and extend; When the metering cylinder delivers hydraulic oil to the pipe-pressing cylinder, the hydraulic oil enters the pressure reducing valve located in the pipe-pressing pipeline from the oil inlet chamber and flows out from the oil outlet chamber. After the pipe-pressing wheel descends to contact the pipe fitting, the pipe-pressing cylinder stops supplying oil. When the oil pressure in the oil outlet chamber is greater than the elastic force of the pressure reducing spring, the hydraulic oil in the oil outlet chamber is pressed into the pressure reducing valve chamber to push the pressure reducing valve core to retract and block the oil inlet channel, and the pipe-pressing pipeline is closed. When the positioning cylinder presses the hydraulic oil to the synchronous cylinder, the hydraulic oil enters the pressure reducing valve located in the positioning pipeline from the oil inlet chamber and flows out from the oil outlet chamber. After the synchronous piston rod rises to contact the pipe fitting, the synchronous cylinder stops supplying oil. When the oil pressure in the oil outlet chamber is greater than the elastic force of the pressure reducing spring, the hydraulic oil in the oil outlet chamber is pressed into the pressure reducing valve chamber to push the pressure reducing valve core to retract and block the oil inlet channel, and the positioning pipeline is closed. When the metering cylinder draws back the hydraulic oil, the hydraulic oil in the pressure reducing valve located in the pressure pipe line and the positioning pipe enters from the oil outlet chamber and flows to the oil inlet chamber through the one-way channel to be drawn out to reset the pressure reducing valve body. When the oil pressure in the oil outlet chamber is less than the elastic force of the pressure reducing spring, the pressure reducing spring pushes the pressure reducing valve core to reset and extend to reopen the oil inlet channel.

4. The stainless steel pipe polishing device according to claim 2, characterized in that: The hydraulic centering mechanism also includes an oil pressure sequence valve, which is used to control the order in which the quantitative oil cylinders pressurize the hydraulic oil. The quantitative oil cylinders are connected to the pressure pipe oil cylinder, the positioning oil cylinder and the lifting oil cylinder respectively through the oil pressure sequence valve; The oil pressure sequence valve includes: A sequence valve body is provided with a sequence valve cavity connected to the quantitative oil cylinder inside, and the sequence valve cavity is provided with a first oil port and a second oil port, the first oil port is connected to the positioning oil cylinder and the pressure pipe oil cylinder, and the second oil port is connected to the lifting oil cylinder; A sequence valve core is slidably connected in the sequence valve cavity so as to be able to block or open the first oil port and the second oil port by sliding; A return spring connected to the sequence valve core to provide the elastic force required for returning the sequence valve core; The lifting cylinder is provided with an oil return pipeline for one-way oil return to the quantitative cylinder, and the conducting direction is from the lifting cylinder to the quantitative cylinder; When the metering cylinder presses the hydraulic oil, the sequential valve core opens the first oil port and blocks the second oil port. The hydraulic oil is first pressed to the pipe pressing cylinder through the first oil port. After the pipe pressing wheel is driven down to contact the pipe fitting, the metering cylinder turns to press the hydraulic oil to the positioning cylinder to drive the synchronous piston rod, the driving mechanism and the polishing wheel to rise. After the synchronous piston rod rises to contact the pipe fitting, the oil pressure in the sequential valve cavity increases. The hydraulic oil in the sequential valve cavity overcomes the elastic force of the return spring to push the sequential valve core to open the second oil port and block the first oil port, so that the hydraulic oil is finally pressed to the lifting cylinder. When the metering cylinder draws back the hydraulic oil, the return spring pushes the sequence valve core to reset to open the first oil port and close the second oil port. The hydraulic oil in the synchronous cylinder is drawn back to the positioning cylinder, the hydraulic oil in the pipe pressing cylinder and the positioning cylinder is drawn back to the metering cylinder through the first oil port, and the hydraulic oil in the lifting cylinder is drawn back to the metering cylinder through the return oil pipeline.

5. The stainless steel pipe polishing device according to claim 1, characterized in that: The compression tube assembly also includes: A buffer cylinder, which is provided with a buffer piston rod, which can slide up and down and is fixedly connected to the pressure pipe cylinder; The locking assembly is used to lock the pipe pressing cylinder so that the pipe pressing cylinder cannot rise or fall; Before the pipe pressing wheel contacts the pipe fitting, the locking assembly locks the pipe pressing cylinder. After the pipe pressing wheel contacts the pipe fitting, the locking assembly unlocks the pipe pressing cylinder so that when the pipe pressing wheel rises or falls with the surface of the pipe fitting, the pipe pressing cylinder can push the buffer piston rod to slide up to compress the air in the buffer cylinder, or drive the buffer piston rod to slide down and extend.

6. The stainless steel pipe polishing device according to claim 5, characterized in that: The locking assembly includes two fixed solenoid valves, which lock the buffer piston rod in the middle position of the buffer cylinder from the upper and lower directions respectively. Before the pipe pressing wheel contacts the pipe fitting, the two fixed solenoid valves lock the buffer piston rod so that the buffer piston rod cannot slide up and down. After the pipe pressing wheel contacts the pipe fitting, the two fixed solenoid valves unlock the buffer piston rod.

7. The stainless steel pipe polishing device according to claim 2, characterized in that: The positioning assembly also includes a lifting cylinder, a lifting platform and a guide frame. The guide frame is fixedly arranged under the roller. The lifting platform is slidably connected to the guide frame. The lifting cylinder is connected to the lifting platform so as to be able to drive the lifting platform to rise and fall. The synchronous cylinder is installed on the lifting platform. After the feed slide drives the polishing wheel to extend into the pipe fitting, the lifting cylinder drives the lifting platform to descend to drive the synchronous piston rod to disengage from the pipe fitting.

8. The stainless steel pipe polishing device according to claim 1, characterized in that: The shaft support mechanism also includes a shaft drive mechanism, which includes a shaft drive motor, a shaft drive shaft and a sleeve, wherein the shaft drive motor is fixedly connected to the shaft drive shaft, the shaft drive shaft is fixedly connected to the polishing wheel, the sleeve is sleeved outside the shaft drive shaft and is rotatably connected to the shaft drive shaft, and the shaft support mechanism includes: The supporting wheel is used to support the driving shaft; Lifting rails are located on both sides of the driving shaft, and the supporting wheels are slidably connected to the lifting rails; The supporting wheel lifting assembly is used to drive the supporting wheel to rise or fall; The wheel lock assembly is used to lock the supporting wheel so that the supporting wheel cannot rise or fall; When the driving mechanism rises or falls, the locking wheel assembly unlocks the supporting wheel, and the supporting wheel lifting assembly drives the supporting wheel to rise or fall synchronously with the driving shaft. When the driving mechanism stops rising or falling, the locking wheel assembly locks the supporting wheel to enable the supporting wheel to keep supporting the driving shaft.

9. The stainless steel pipe polishing device according to claim 8, characterized in that: The supporting wheel lifting assembly includes a counterweight, a fixed pulley and a connecting belt. The fixed pulley is fixed to the upper end of the lifting slide rail. One end of the connecting belt is connected to the counterweight, and the other end bypasses the fixed pulley and is connected to the supporting wheel. The locking wheel assembly includes a locking wheel cylinder, a locking wheel piston rod, a locking wheel solenoid valve and a self-locking pipeline. The locking wheel piston rod is fixedly connected to the supporting wheel and slidably connected to the locking wheel cylinder so as to be able to slide up and down. The locking wheel piston rod divides the interior of the locking wheel cylinder into two upper and lower chambers. The self-locking pipeline connects the two chambers respectively. The locking wheel cylinder The wheel solenoid valve is arranged on the self-locking pipeline so as to be able to open and block the self-locking pipeline. When the driving shaft rises, the wheel locking solenoid valve opens the self-locking pipeline, and the hydraulic oil in the two chambers can flow freely, so that the wheel locking piston rod can slide up and down, and the counterweight block can be lowered to drive the supporting wheel to rise synchronously with the driving shaft. After the driving shaft stops rising, the wheel locking solenoid valve closes the self-locking pipeline, and the hydraulic oil in the two chambers cannot flow, and the wheel locking piston rod and the supporting wheel are locked, so that the supporting wheel keeps supporting the driving shaft.

10. The stainless steel pipe polishing device according to claim 2, characterized in that: The effective area ratio of the pistons of the pipe pressing cylinder, the synchronous cylinder, the positioning cylinder and the lifting cylinder is 1:1:1:2.

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