Stainless steel pipe polishing device

Abstract

The stainless steel pipe polishing device relates to the technical field of stainless steel pipe polishing, and is used for polishing the inner wall of a circular stainless steel pipe fitting, comprising a polishing wheel, a driving mechanism, a feed slide, a roller and a hydraulic centering mechanism, wherein the driving mechanism is fixedly connected to the polishing wheel to drive the polishing wheel to rotate, the driving mechanism is installed 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 withdraw from the pipe fitting, the roller is used to support and drive 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 to press the pipe fitting from directly above the pipe fitting, the lifting assembly is used to drive the driving mechanism and the polishing wheel to rise or fall, and the quantitative driving assembly is used to drive the pipe pressing assembly and the lifting assembly. After the pipe fitting is fed to the roller, the polishing wheel can be automatically aligned with the center of the pipe fitting, which is beneficial to reducing the time required for manual adjustment and improving the efficiency of the polishing operation.

Description

Technical Field

[0001] The invention relates to the technical field of metal polishing, and in particular to a stainless steel pipe polishing device. Background Art

[0002] After stainless steel pipes are made, they need to be surface treated, and polishing is one of the surface treatment processes that usually needs to be done. Some stainless steel pipes need to be polished not only on the outer surface but also on the inner surface. Internal polishing is a process used to improve the surface finish and quality of the inner surface of stainless steel pipes. In the prior art, special internal polishing tools are usually used, such as polishing wheels, rotating brushes and other flexible grinding heads, which are aligned with the center of the stainless steel pipe and extended into the inner wall for polishing by rotating and pushing. However, when polishing stainless steel pipes of different diameters using polishing wheels in the prior art, the operator is usually required to manually adjust the equipment based on experience and visual observation so that the center of the polishing wheel is aligned with the center of the stainless steel pipe. It often takes a lot of time to adjust repeatedly, 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 realize automatic alignment of the polishing wheel with the center of the pipe, which is beneficial to reducing the time required for manual adjustment and improving the efficiency of the polishing operation.

[0004] In order to achieve the above object, the present invention provides the following technical solutions.

[0005] The stainless steel pipe polishing device is used to polish the inner wall of a round stainless steel pipe fitting, and includes a polishing wheel, a driving mechanism, a feed slide, a roller and a hydraulic centering mechanism. The driving mechanism is fixedly connected to the polishing wheel to drive the polishing wheel to rotate. The driving mechanism is installed on the feed slide and can rise or fall. The feed slide can slide forward and backward to drive the polishing wheel to extend into or exit the pipe fitting. The roller is used to support and drive the pipe fitting to rotate. The hydraulic centering mechanism includes:

[0006] 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;

[0007] A lifting assembly, including a lifting cylinder, is used to drive the driving mechanism and the polishing wheel to rise or fall;

[0008] 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;

[0009] 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.

[0010] After the pipe is loaded, its bottom end is aligned with the center of the polishing wheel. Since the driving mechanism and the polishing wheel are heavy, when the metering cylinder presses the hydraulic oil, the hydraulic oil will first go through the pressure pipe pipeline with a relatively smaller load. In other cases, valves can also be set to control the order of hydraulic oil pressure delivery. The metering cylinder first drives the pipe pressing wheel to descend until it contacts the pipe fitting. At this time, the remaining stroke of the pipe pressing cylinder is the outer diameter of the pipe fitting. After the pipe pressing wheel contacts the pipe fitting, it cannot continue to descend, and the pipe pressing cylinder cannot continue to supply oil. The remaining hydraulic oil in the metering cylinder is transferred and pressed to the lifting cylinder, thereby driving the driving mechanism and the polishing wheel to start rising based on the bottom position 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 can just drive the stroke of the lifting cylinder to be half of the outer diameter of the pipe fitting, that is, the stroke of driving the driving mechanism and the polishing wheel to rise is the radius of the pipe fitting, so that the center of the polishing wheel rises to the height of the radius of the pipe fitting based on the bottom position of the pipe fitting, thereby aligning with the center of the pipe fitting, and then the feed slide drives the polishing wheel to extend into the pipe fitting for polishing. The entire process is controlled by hydraulic pressure, which can realize the automatic alignment of the polishing wheel to the center of the pipe fitting, which is conducive to reducing the time required for manual adjustment and improving the efficiency and quality of polishing operations.

[0011] Furthermore, the hydraulic centering mechanism also includes a positioning assembly, which includes:

[0012] 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;

[0013] 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;

[0014] 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;

[0015] 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;

[0016] 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.

[0017] When pipes of different sizes are fed to the rollers, the positions of their lowest ends will be different, which will cause the center of the polishing wheel to be at different heights than the lowest end of the pipe, which will further cause the subsequent polishing wheel to be unable to align with the center of the pipe after it rises to the height of the pipe radius. By setting a positioning assembly, the center of the polishing wheel is driven by the positioning cylinder to rise to the height of the pipe radius before being driven to rise to the height of the pipe radius, thereby determining the reference height for the subsequent rise of the polishing wheel. At this time, the remaining stroke between the pipe pressing wheel and the synchronous piston rod is the outer diameter of the pipe. Therefore, when it is necessary to perform internal polishing on pipes of different sizes, the center of the polishing wheel can also adaptively remain flush with the lowest ends of different pipes, thereby ensuring that it can be correctly risen to align with the center of the pipe, thereby improving the accuracy and versatility of the device.

[0018] Furthermore, both the pressure pipe line and the positioning pipe line are provided with a pressure reducing valve, and the pressure reducing valve comprises:

[0019] 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.

[0020] 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;

[0021] 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;

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Since the pressure output by the metering cylinder needs to be larger and larger to overcome the gravity of the driving mechanism, polishing wheel and positioning cylinder to lift them, this pressure will also be transmitted to the pipe pressing wheel and synchronous piston rod through the pipeline, causing the pipe pressing wheel and synchronous piston rod to also squeeze the pipe fittings vigorously. For pipe fittings with thinner walls, they may be squeezed and deformed. By setting a pressure reducing valve on the pipe pressing pipeline and the positioning pipeline, the corresponding pipeline can be closed after the pipe pressing wheel and the synchronous piston rod are in place, thereby preventing the pressure of the metering cylinder from continuing to be transmitted to the pipe fittings, causing the pipe fittings to be squeezed and deformed.

[0026] Furthermore, the hydraulic centering mechanism also includes an oil pressure sequence valve for controlling the order in which the quantitative cylinders pressurize the hydraulic oil, and the quantitative cylinders are respectively connected to the pressure pipe cylinder, the positioning cylinder and the lifting cylinder through the oil pressure sequence valve;

[0027] The oil pressure sequence valve includes:

[0028] 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;

[0029] 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;

[0030] A return spring connected to the sequence valve core to provide the elastic force required for returning the sequence valve core;

[0031] 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;

[0032] 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 toward 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 in turn presses the hydraulic oil toward 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 toward the lifting cylinder.

[0033] When the metering cylinder withdraws the hydraulic oil, the reset 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 withdrawn to the positioning cylinder, the hydraulic oil in the tube pressing cylinder and the positioning cylinder is withdrawn to the metering cylinder through the first oil port, and the hydraulic oil in the lifting cylinder is withdrawn to the metering cylinder through the return oil pipeline. The tube pressing cylinder, the positioning cylinder and the lifting cylinder need to act in sequence. If the sequence is messed up, the purpose of aligning the center of the polishing wheel with the center of the pipe fitting cannot be achieved. Hydraulic oil usually flows to places with less resistance. Therefore, under normal circumstances, the action sequence of the tube pressing cylinder, the positioning cylinder and the lifting cylinder will not be messed up. However, in order to avoid accidents, setting an oil pressure sequence valve to control their action sequence can ensure this sequence.

[0034] Furthermore, the compression tube assembly also includes:

[0035] 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;

[0036] The locking assembly is used to lock the pipe pressing cylinder so that the pipe pressing cylinder cannot rise or fall;

[0037] 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. The outer side of the pipe fitting may not be completely flat, and its surface may have ups and downs. Since the hydraulic oil is not easily compressed, the pipe pressing wheel maintains rigid compression of the pipe fitting. Then, during the rotation of the pipe fitting, the pipe pressing wheel and the pipe fitting may collide, get stuck, or even damage the product or equipment. By setting a buffer cylinder to connect the pipe pressing cylinder, the principle that gas is easily compressed is used, so that when the pipe pressing wheel encounters ups and downs, it can compress the buffer cylinder upward to a certain extent or drive the buffer cylinder downward while maintaining contact, so that the pipe pressing wheel and the pipe fitting maintain flexible contact, thereby avoiding the situation where the pipe pressing wheel and the pipe fitting collide or are damaged due to the uneven outer side of the pipe fitting when they are in contact.

[0038] Furthermore, 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. When the pipe pressing wheel rises or falls with the surface of the pipe fitting, the fixed solenoid valve unlocks the buffer piston rod, and the pipe pressing cylinder can push the buffer piston rod up to compress the air in the buffer cylinder, or drive the buffer piston rod to extend. The air in the buffer cylinder plays a buffering role here, similar to the shock absorber of a car. When the surface of the pipe fitting is uneven or there is a slight displacement during the processing process, the buffer cylinder can absorb the impact force caused by these changes. Before the pipe pressing wheel contacts the pipe fitting, two fixed solenoid valves lock the buffer piston rod from the upper and lower directions respectively. The buffer piston rod will not drop due to its own gravity and the pipe pressing assembly, thereby avoiding affecting the execution of the hydraulic centering mechanism. It also avoids 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, and the buffer cylinder cannot play a buffering role at this time.

[0039] Furthermore, the positioning assembly also includes a lifting cylinder, a lifting platform and a guide frame, the guide frame is fixedly arranged below 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, and the synchronous oil 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, so as to drive the synchronous piston rod to disengage from the pipe fitting. Since the pipe pressing cylinder, the positioning cylinder and the lifting cylinder still need to maintain pressure after the polishing wheel extends into the pipe fitting, the synchronous oil cylinder cannot lower the synchronous piston rod by pressure relief. By separately arranging a lifting cylinder, a lifting platform and a guide frame to drive the synchronous oil cylinder and the synchronous piston rod to rise and fall, the synchronous piston rod can be driven to descend by the lifting cylinder after the polishing wheel extends into the pipe fitting, thereby disengaging from the pipe fitting and avoiding the pipe fitting from colliding with the synchronous piston rod when rotating.

[0040] Furthermore, the stainless steel pipe polishing device of the present invention further comprises a shaft supporting mechanism, the driving mechanism comprises a driving motor, a driving shaft and a sleeve, the driving motor is fixedly connected to the driving shaft, the driving shaft is fixedly connected to the polishing wheel, the sleeve is sleeved outside the driving shaft and is rotatably connected to the driving shaft, and the shaft supporting mechanism comprises:

[0041] The supporting wheel is used to support the driving shaft;

[0042] Lifting rails are located on both sides of the driving shaft, and the supporting wheels are slidably connected to the lifting rails;

[0043] The supporting wheel lifting assembly is used to drive the supporting wheel to rise or fall;

[0044] The wheel lock assembly is used to lock the supporting wheel so that the supporting wheel cannot rise or fall;

[0045] 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.

[0046] The length of the drive shaft is usually long, one end of which is fixed to the drive motor, and the rest of the shaft is suspended in the air. Due to the gravity of the drive shaft itself and the centrifugal force generated during rotation, the drive shaft is prone to vibration during rotation, which affects the stability of the device and leads to poor polishing effect. At the same time, due to the long-term exposure to its own gravity and external forces during operation, the part of the drive shaft suspended in the air is also prone to bending and deformation, and may also suffer from fatigue fracture. By providing a shaft support mechanism to provide support for the part of the drive shaft suspended in the air, the drive shaft is prevented from bending, thereby improving the stability of the device and the polishing effect.

[0047] Furthermore, 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 is 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, and the self-locking pipelines are respectively connected to the two chambers The wheel locking solenoid valve is arranged in the self-locking pipeline 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.

[0048] Furthermore, the effective area ratio of the pistons of the tube pressing cylinder, the synchronization cylinder, the positioning cylinder and the lifting cylinder is 1:1:1:2. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic diagram of the three-dimensional structure of the stainless steel pipe polishing device of the present invention.

[0050] Figure 2 It is a schematic diagram of the three-dimensional structure of the stainless steel pipe polishing device of the present invention at another viewing angle.

[0051] Figure 3 The present invention is a schematic diagram of the three-dimensional structure of the stainless steel pipe polishing device after hiding the rollers, the feed slide and the frame.

[0052] Figure 4 for Figure 3 Front view of the stainless steel pipe polishing device in the state.

[0053] Figure 5 for Figure 3 Cross-sectional view of the stainless steel tube polishing device in the state.

[0054] Figure 6 for Figure 5 A magnified schematic diagram of center A.

[0055] Figure 7 for Figure 5 A magnified schematic diagram of point B in the middle.

[0056] Figure 8 for Figure 4 Cross-sectional view of the stainless steel pipe polishing device along the CC direction in the state.

[0057] Fig. 9 for Figure 8Enlarged schematic diagram of point E in the middle.

[0058] Fig.10 for Figure 4 Cross-sectional view of the stainless steel tube polishing device along the DD direction in the state.

[0059] Fig.11 for Fig.10 Enlarged schematic diagram of point F in the middle.

[0060] Reference numerals include:

[0061] A driving mechanism 1, a driving motor 11, a driving shaft 12, and a shaft sleeve 13;

[0062] A pipe pressing assembly 2, a pipe pressing oil cylinder 21, a pipe pressing wheel 22, a pipe pressing pipeline 23, a buffer cylinder 24, a buffer piston rod 241, and a fixed solenoid valve 25;

[0063] Positioning cylinder 3, synchronous cylinder 31, synchronous piston rod 32, lifting cylinder 33, lifting platform 34, guide frame 35, positioning pipeline 36;

[0064] Lifting cylinder 4, oil return line 41;

[0065] Pressure reducing valve 5, pressure reducing valve body 51, pressure reducing valve chamber 511, oil inlet chamber 512, oil outlet chamber 513, oil inlet passage 514, one-way passage 515, one-way valve core 5151, pressure reducing valve core 52, pressure reducing spring 53;

[0066] The oil pressure sequence valve 6, the sequence valve body 61, the sequence valve chamber 611, the first oil port 6111, the second oil port 6112, the sequence valve core 62, and the return spring 63;

[0067] Axle supporting mechanism 7, supporting wheel 71, connecting block 711, lifting slide rail 72, counterweight block 73, fixed pulley 74, connecting belt 75, wheel locking cylinder 76, wheel locking piston rod 77, wheel locking solenoid valve 78, self-locking pipeline 79;

[0068] Dosing cylinder 8, polishing wheel 9, feed slide 10;

[0069] Roller 14, frame 15, bracket 151, pipe fitting 16. DETAILED DESCRIPTION

[0070] The present invention is described in detail below in conjunction with specific embodiments.

[0071] Combination Figure 1 and Figure 2 The stainless steel pipe polishing device of embodiment 1 comprises a polishing wheel 9, a driving mechanism 1, a feed slide 10, a roller 14, a frame 15 and a hydraulic centering mechanism, Figure 3 and Figure 5The driving mechanism 1 includes a driving motor 11, a driving shaft 12 and a sleeve 13. The driving motor 11 is fixedly connected to the driving shaft 12, and the driving shaft 12 is fixedly connected to the polishing wheel 9. The sleeve 13 is sleeved outside the driving shaft 12 and is rotatably connected to the driving shaft 12 through a bearing. The driving motor 11 is installed 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 the polishing wheel 9 can be driven to extend into or exit the pipe 16. The roller 14 is used to support and drive the pipe 16 to rotate, and the frame 15 is provided with a bracket 151.

[0072] Combination Figure 1-Figure 5 The hydraulic centering mechanism includes a pipe pressing assembly 2, a positioning assembly, a lifting assembly and a quantitative driving assembly. The pipe pressing assembly 2 is installed on the bracket 151. The pipe pressing assembly 2 includes a pipe pressing wheel 22, a pipe pressing cylinder 21 and a pipe pressing pipeline 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 synchronous cylinder 31, a positioning cylinder 3 and a positioning pipeline 36. The synchronous cylinder 31 is arranged below the roller 14 and is provided with a synchronous piston rod 32. The synchronous piston rod 32 is used to contact the pipe fitting 16 from directly below, such as Figure 4 As shown, in the initial position, the upper end surface of the synchronous piston rod 32 is flush with the center of the polishing wheel 9 (indicated by the dotted line), the positioning cylinder 3 is connected to the driving motor 11 to be able to drive the driving mechanism 1 and the polishing wheel 9 to rise or fall, the lifting assembly includes the lifting cylinder 4, 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 driving mechanism 1 and the polishing wheel 9 to rise or fall, and the positioning pipeline 36 connects 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 the quantitative cylinder 8, which is connected to the pressure pipe cylinder 21, the positioning cylinder 3 and the lifting cylinder 4 respectively, wherein the quantitative cylinder 8 is connected to the pressure pipe cylinder 21 through the pressure pipe pipeline 23, and is connected to the positioning cylinder 3 through the positioning pipeline 36. Among them, the piston effective area ratio of the compression cylinder 21, the synchronization cylinder 31, the positioning cylinder 3 and the lifting cylinder 4 is 1:1:1:2. The piston effective area ratio represents the ratio of the stroke of the piston rod of the cylinder when the same amount of oil is injected or extracted.

[0073] When the pipe 16 has not been loaded onto the roller 14, the amount of hydraulic oil in the metering cylinder 8 is set to just be able to drive the pipe pressing wheel 22 to descend to contact the upper end surface of the synchronous piston rod 32. After the pipe 16 is loaded onto the roller 14, the metering cylinder 8 first presses the hydraulic oil to the pipe pressing cylinder 21 with the smallest load to drive the pipe pressing wheel 22 to descend. After the pipe pressing wheel 22 descends to contact the pipe 16, the metering cylinder 8 presses the hydraulic oil to the positioning cylinder 3 with a relatively small load, so that the driving mechanism 1 and the polishing wheel 9 are driven to rise. At the same time, the positioning cylinder 3 drives the synchronous piston rod 32 to rise synchronously through the positioning pipeline 36 until it contacts the pipe 16. At this time, the center of the polishing wheel 9 is aligned with the bottom end of the pipe 16, and the remaining stroke between the pipe pressing wheel 22 and the synchronous piston rod 32 is the outer diameter of the pipe 16. Finally, the metering cylinder 8 presses hydraulic oil to the lifting cylinder 4 with the heaviest load, so that the positioning cylinder 3, the driving mechanism 1 and the polishing wheel 9 are driven to rise. After the remaining oil in the metering cylinder 8 is all pressed to the lifting cylinder 4, due to the effective area ratio of the pistons of the above-mentioned cylinders, the positioning cylinder 3, the driving mechanism 1 and the polishing wheel 9 are driven to rise by a stroke that is half of the remaining stroke between the pipe pressing wheel 22 and the synchronous piston rod 32, that is, the size of the radius of the pipe fitting 16, so that the center of the polishing wheel 9 is 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.

[0074] Hydraulic oil will flow under the action of pressure difference. When there are different paths in the system, hydraulic oil will tend to flow to places where resistance is relatively small. Since the driving mechanism 1, polishing wheel 9 and metering cylinder 8 all have a certain weight, the resistance to the metering cylinder 8 is relatively large. Therefore, when the metering cylinder 8 is pressurizing the hydraulic oil, the hydraulic oil will first go through the pressure pipe line 23 with the relatively smallest load, and then be pressed to the positioning cylinder 3 with a relatively small load, and finally be pressed to the lifting cylinder 4 with the largest load. In other cases, the hydraulic oil pressure delivery order can also be controlled by setting valves. When the pipe pressing wheel 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 is aligned with the bottom end of the pipe fitting 16, and the remaining stroke between the pipe pressing wheel 22 and the synchronous piston rod 32 is the outer diameter of the pipe fitting 16. When the amount (volume) of hydraulic oil is constant, the stroke of the cylinder is inversely proportional to the effective area of ​​the piston of the cylinder. By setting the effective area ratio of the pistons of the pipe pressing cylinder 21, the synchronous cylinder 31, the positioning cylinder 3 and the lifting cylinder 4 to 1:1:1:2, When the remaining stroke between the wheel 22 and the synchronous piston rod 32 is equal to the size of the outer diameter of the pipe 16, the metering cylinder 8 presses the remaining hydraulic oil to the lifting cylinder 4 with twice the effective piston area. At this time, the lifting cylinder 4 can drive the polishing wheel 9 to rise to a height of half the outer diameter of the pipe 16, that is, the size of the radius of the pipe 16, so that the center of the polishing wheel 9 is aligned with the center of the pipe 16 based on the bottom position of the pipe 16 by the size of the radius of the pipe 16, and then the feed slide 10 drives the polishing wheel 9 to extend into the pipe 16 for polishing. The whole process is controlled by hydraulic pressure, which can realize the automatic alignment of the polishing wheel 9 with the center of the pipe 16, which is conducive to reducing the time required for manual adjustment and improving the efficiency and quality of the polishing operation. When pipes 16 of different sizes are fed to the roller 14, their bottom positions will also be different, which will cause the center of the polishing wheel 9 and the bottom position of the pipe 16 to be not at the same height, which will further cause the subsequent polishing wheel 9 to rise to the height of the radius of the pipe 16 and fail to align with the center of the pipe 16. By setting up the positioning assembly, the center of the polishing wheel 9 is first driven by the positioning cylinder 3 to rise to the height of the radius of the pipe fitting 16 before being driven to rise to the height of the radius of the pipe fitting 16, thereby determining the reference height for the subsequent rise of the polishing wheel 9. Therefore, when internal polishing of pipe fittings 16 of different sizes is required, the center of the polishing wheel 9 can also adaptively remain flush with the bottom ends of different pipe fittings 16, thereby ensuring that it can be correctly risen to align with the center of the pipe fitting 16, thereby improving the accuracy and versatility of the device.

[0075] Of course, in the case where only one size of pipe 16 is internally polished for a long time, the positioning component may not be provided on the basis of the present embodiment, and the center position of the polishing wheel 9 may be set so that it is aligned with the bottom of the pipe 16 at the initial position, and then by selecting appropriate parameters such as the volume and stroke of the lifting cylinder 4, for example, the effective piston area ratio of the tube pressing cylinder 21 and the lifting cylinder 4 is set to 1:2, so that the remaining oil amount in the metering cylinder 8 is just enough to drive the lifting cylinder 4 to a stroke of half the outer diameter of the pipe 16, and the polishing wheel 9 can also be automatically aligned with the center of the pipe 16.

[0076] Since the pressure output by the metering cylinder 8 needs to be larger and larger to overcome the gravity of the driving mechanism 1, the polishing wheel 9 and the positioning cylinder 3 to lift them, this pressure will also be transmitted to the pipe pressing wheel 22 and the synchronous piston rod 32 through the pipeline, causing the pipe pressing wheel 22 and the synchronous piston rod 32 to squeeze the pipe 16 vigorously. For the pipe 16 with a thinner wall, it may be squeezed and deformed. Figure 5 and Figure 6 In this embodiment, the pressure pipe line 23 and the positioning line 36 are both provided with a pressure reducing valve 5, which includes a pressure reducing valve body 51, a pressure reducing valve core 52 and a pressure reducing spring 53. A pressure reducing valve chamber 511, an oil inlet chamber 512, an oil outlet chamber 513, an oil inlet passage 514 and a one-way passage 515 are provided inside the pressure reducing valve body 51. The two ends of the oil inlet passage 514 are respectively connected to the oil inlet chamber 512 and the oil outlet chamber 513, and the oil outlet chamber 513 is connected to the pressure reducing valve chamber 511. A one-way valve core 5151 is provided in the one-way passage 515. The conducting direction of the one-way passage 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 passage 514, so that it can be extended or retracted by sliding to open or block the oil inlet passage 514. 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.

[0077] When the metering cylinder 8 presses the hydraulic oil to the pipe-pressing cylinder 21, the hydraulic oil enters the pressure reducing valve 5 located in the pipe-pressing pipeline 23 from the oil inlet chamber 512 and flows out from the oil outlet chamber 513. After the pipe-pressing wheel 22 descends to contact the pipe fitting 16, the pipe-pressing cylinder 21 stops supplying oil, and the oil pressure in the oil outlet chamber 513 begins to increase. When the oil pressure is greater than the elastic force of the pressure reducing spring 53, the hydraulic oil in the oil outlet chamber 513 is pressed into the pressure reducing valve chamber 511 to push the pressure reducing valve core 52 to retract and block the oil inlet passage 514, and the pipe-pressing pipeline 23 is closed. When the positioning cylinder 3 presses the hydraulic oil to the synchronization cylinder 31, the hydraulic oil enters the pressure reducing valve 5 located in the positioning pipeline 36 from the oil inlet chamber 512 and flows out from the oil outlet chamber 513. After the synchronization piston rod 32 rises to contact the pipe fitting 16, the synchronization cylinder 31 stops supplying oil, and the oil pressure in the oil outlet chamber 513 begins to increase until it is greater than the elastic force of the pressure reducing spring 53. The hydraulic oil in the oil outlet chamber 513 is pressed 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.

[0078] When the metering cylinder 8 withdraws the hydraulic oil, the hydraulic oil of the pressure reducing valve 5 located in the pressure pipe line 23 and the positioning line 36 enters from the oil outlet chamber 513, and flows to the oil inlet chamber 512 through the one-way channel 515 to be drawn out and the pressure reducing valve body 51 is reset. When the oil pressure in the oil 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 to reopen the oil inlet channel 514. By arranging the pressure reducing valve 5 in the pressure pipe line 23 and the positioning line 36, the corresponding pipeline can be closed after the pressure pipe wheel 22 and the synchronous piston rod 32 are in place, thereby preventing the pressure of the metering cylinder 8 from continuing to be transmitted to the pipe fitting 16, causing the pipe fitting 16 to be squeezed and deformed. The extrusion force on the pipe fitting 16 is equal to the elastic force when the pressure reducing spring 53 is pushed. By selecting the appropriate elastic force, the extrusion force on the pipe fitting 16 can be selected.

[0079] The pipe pressing cylinder 21, the positioning cylinder 3 and the lifting cylinder 4 need to act in sequence. If the sequence is messed up, the purpose of aligning the center of the polishing wheel 9 with the center of the pipe 16 cannot be achieved. Figure 5 and Figure 7The hydraulic centering mechanism of the present embodiment further comprises an oil pressure sequence valve 6, through which the quantitative oil cylinder 8 is respectively connected to the pressure pipe oil cylinder 21, the positioning oil cylinder 3 and the lifting oil cylinder 4, the oil pressure sequence valve 6 comprises a sequence valve body 61, a sequence valve core 62 and a return spring 63, a sequence valve chamber 611 connected to the quantitative oil cylinder 8 is provided inside the sequence valve body 61, the sequence valve chamber 611 is provided with a first oil port 6111 and a second oil port 6112, the first oil port 6111 is connected to the positioning oil cylinder 3 and the pressure pipe oil cylinder 21, the second oil port 6112 is connected to the lifting oil cylinder 4, and the pressure pipe oil cylinder 21 is connected to the positioning oil cylinder 3 and the pressure pipe oil cylinder 21. The lifting cylinder 4 and the sequential valve core 62 are slidably connected in the sequential valve chamber 611 so as to be able to block or open the first oil port 6111 and the second oil port 6112 by sliding. There is a channel inside the sequential valve core 62. When it is in the initial position, the channel connects the metering cylinder 8 and the first oil port 6111. The reset spring 63 is connected to the sequential valve core 62 to provide the elastic force required for resetting the sequential valve core 62. The lifting cylinder 4 is provided with an oil return pipeline 41 for one-way oil return to the metering cylinder 8, and its conducting direction is from the lifting cylinder 4 to the metering cylinder 8.

[0080] When the metering cylinder 8 presses the hydraulic oil, the sequential valve core 62 opens the first oil port 6111 and blocks the second oil port 6112. The hydraulic oil is first pressed to the tube pressing cylinder 21 through the first oil port 6111. After the tube pressing wheel 22 is driven down to contact the pipe fitting 16, the metering cylinder 8 turns to press the hydraulic oil to the positioning cylinder 3 to drive the synchronous piston rod 32, the driving mechanism 1 and the polishing wheel 9 to rise. After the synchronous piston rod 32 rises to contact the pipe fitting 16, the oil pressure in the sequential valve chamber 611 increases. The hydraulic oil in the sequential valve chamber 611 overcomes the elastic force of the reset spring 63 to push the sequential 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 metering cylinder 8 withdraws the hydraulic oil, the reset spring 63 pushes the sequence valve core 62 to reset, so as to open the first oil port 6111 and close the second oil port 6112, and the hydraulic oil in the synchronous cylinder 31 is withdrawn to the positioning cylinder 3, the hydraulic oil in the pipe-pressing cylinder 21 and the positioning cylinder 3 is withdrawn to the metering cylinder 8 through the first oil port 6111, and the hydraulic oil in the lifting cylinder 4 is withdrawn to the metering cylinder 8 through the return oil line 41. The hydraulic oil usually flows to the place with less resistance, so under normal circumstances, the action sequence of the pipe-pressing cylinder 21, the positioning cylinder 3 and the lifting cylinder 4 will not be disordered, but in order to avoid accidents, the oil-pressing sequence valve 6 is set to control their action sequence, so that this sequence can be ensured.

[0081] The outer side of the pipe 16 may not be completely flat, and its surface may be undulating or slightly deformed. The cross section of the outer side is not a perfect circle, but a little elliptical. Since the hydraulic oil is not easily compressed, the pipe pressing wheel 22 keeps the pipe 16 rigidly pressed. In the process of the pipe 16 rotating, the pipe pressing wheel 22 and the pipe 16 may collide, get stuck, or even damage the product or equipment. Figure 8 and Fig. 9 The pipe pressing assembly 2 of this embodiment also includes a buffer cylinder 24 and a locking assembly. The buffer cylinder 24 is provided with a buffer piston rod 241. The buffer piston rod 241 can slide up and down and is fixedly connected to the pipe pressing oil cylinder 21. The locking assembly includes two fixed solenoid valves 25. The two fixed solenoid valves 25 lock the buffer piston rod 241 in the middle position of the buffer cylinder 24 (the middle position between the buffer piston rod 241 being fully retracted and fully extended) from the upper and lower directions respectively, so that the pipe pressing oil cylinder 21 cannot rise or fall when locked. Before the pipe pressing wheel 22 contacts the pipe fitting 16, the fixed solenoid valve 25 locks the buffer piston rod 241. After the pipe pressing wheel 22 contacts the pipe fitting 16, the fixed solenoid valve 25 unlocks the buffer piston rod 241, so that when the pipe pressing wheel 22 rises or falls with the surface of the pipe fitting 16, the pipe pressing oil cylinder 21 can push the buffer piston rod 241 to slide up to compress the air in the buffer cylinder 24, or drive the buffer piston rod 241 to slide down and extend. By setting a buffer cylinder 24 to connect the pipe pressing cylinder 21, the principle that gas is easily compressed is used to make the pipe pressing wheel 22 play a buffering role when encountering ups and downs, similar to the shock absorber of a car. When the surface of the pipe fitting 16 is uneven or there is a slight displacement during the processing, the buffer cylinder 24 can absorb the impact force generated by these changes, thereby avoiding the pipe pressing wheel 22 and the pipe fitting 16 from colliding or being damaged due to the uneven outer surface of the pipe fitting 16 when in contact. Before the pipe pressing wheel 22 contacts the pipe fitting 16, the two fixed solenoid valves 25 lock the buffer piston rod 241 from the upper and lower directions respectively, and the buffer piston rod 241 will not fall due to the gravity of itself and the pipe pressing assembly 2, thereby avoiding affecting the execution of the hydraulic centering mechanism, and also avoiding 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 in the buffer cylinder 24, it means that the buffer piston rod 241 can no longer rise, and the buffer cylinder 24 cannot play a buffering role at this time.

[0082] After the polishing wheel 9 extends into the pipe 16, the pipe pressing cylinder 21, the positioning cylinder 3 and the lifting cylinder 4 still need to maintain pressure, which makes it impossible for the synchronous cylinder 31 to lower the synchronous piston rod 32 by relieving pressure. When the pipe 16 is driven to rotate, it may rub or collide with the synchronous piston rod 32. Figure 3 and Figure 8The positioning assembly of this embodiment further includes a lifting cylinder 33, a lifting platform 34 and a guide frame 35. The guide frame 35 is fixedly arranged below the 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 so as to be able to drive the lifting platform 34 to rise and fall. The synchronous oil cylinder 31 is installed 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 descend, so as to drive the synchronous piston rod 32 to break away from the contact with the pipe 16. By additionally arranging the lifting cylinder 33, the lifting platform 34 and the guide frame 35 to drive the synchronous oil 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, so as to break away from the contact with the pipe 16, and avoid friction or collision between the pipe 16 and the synchronous piston rod 32 when rotating. A roller may also be provided at the top of the synchronous piston rod 32 so that it does not need to be lowered. However, unlike the pipe pressing wheel 22, the synchronous piston rod 32 does not need to contact the pipe 16 during the polishing process. Therefore, it is better to lower it so that the pipe 16 has one less unnecessary contact point.

[0083] The drive shaft 12 is usually long, with one end fixed to the drive motor 11, and the rest of the shaft is suspended in the air. Due to the gravity of the drive shaft 12 and the centrifugal force generated during rotation, the drive shaft 12 is prone to vibration during rotation, which affects the stability of the device and leads to poor polishing effect. At the same time, due to the long-term exposure to its own gravity and external forces during operation, the part of the drive shaft 12 suspended in the air is also prone to bending and deformation, and may also suffer fatigue fracture. Figure 3 , Fig.10 and Fig.11The stainless steel pipe polishing device of this embodiment also includes a shaft supporting mechanism 7, which includes a supporting wheel 71, a lifting rail 72, a supporting wheel lifting assembly and a locking wheel assembly. Two supporting wheels 71 of this embodiment are provided and are connected by a connecting block 711. The supporting wheel 71 is slidably connected to the lifting rail 72, and the lifting rail 72 is located on both sides of the driving shaft 12. The supporting 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 supporting wheel 71 and the driving mechanism 1, for example, it can provide support for the driving shaft 12 without lifting the driving shaft 12. The 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 block 73, and the other end bypasses the fixed pulley 74 and is connected to the supporting 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 pipeline 79. The locking wheel piston rod 77 is fixedly connected to the supporting wheel 71 and is slidably connected to the locking wheel cylinder 76 so that it can slide up and down. The locking wheel piston rod 77 divides the interior of the locking wheel cylinder 76 into two upper and lower chambers. The self-locking pipeline 79 connects the two chambers respectively. The locking wheel solenoid valve 78 is arranged at the self-locking The pipeline 79 can open and block the self-locking pipeline 79. When the drive shaft 12 rises, the wheel locking solenoid valve 78 opens the self-locking pipeline 79, and the hydraulic oil in the two chambers can flow freely, so that the wheel locking piston rod 77 can slide up and down, and the counterweight block 73 can be lowered to drive the supporting wheel 71 to rise synchronously with the drive shaft 12. After the drive shaft 12 stops rising, the wheel locking solenoid valve 78 closes the self-locking pipeline 79, and the hydraulic oil in the two chambers cannot flow. The wheel locking piston rod 77 and the supporting wheel 71 are locked, so that the supporting wheel 71 keeps supporting the drive shaft 12. The shaft supporting mechanism 7 is provided to provide support for the part of the drive shaft 12 suspended in the air to prevent the drive shaft 12 from bending, thereby improving the stability and polishing effect of the device.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of 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 toward 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 in turn presses the hydraulic oil toward 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 toward 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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