A synchronous polishing device for the inner and outer surfaces of a PE pipe

Abstract

The application discloses a synchronous polishing equipment for the inner and outer surfaces of a PE pipe and relates to the technical field of intelligent manufacturing equipment. The synchronous polishing equipment comprises centrifugal polishing components, two horizontally-arranged knife shafts, polishing knives radially arranged at one end of each of the two knife shafts, hydraulic motor reducers I connected to the other ends of the two knife shafts and used for driving the rotation of the two knife shafts, a supporting component, a cantilever base used for suspension and fixation, a mounting rack mounted on the cantilever base, a main shaft rotatably connected to the mounting rack and a swing arm fixedly connected to one end of the main shaft. The polishing equipment is capable of quickly adapting to different pipe diameters and floatingly following the oval deformation of the pipe wall through a knife shaft spacing adjusting mechanism formed by arranging floating guide wheels, thereby ensuring the uniformity and consistency of the polishing layer thickness. The polishing equipment is also capable of being conveniently used and being guaranteed by stable existing mature engineering equipment systems through the design of quick connectors and the integration of hydraulic power paths.

Description

Technical Field

[0001] This invention relates to the field of intelligent manufacturing equipment technology, and more specifically, to a device for synchronous internal and external grinding of PE pipes. Background Technology

[0002] With the widespread application of polyethylene (PE) pipes in municipal water supply and drainage, gas transmission and other fields, the quality of pipe connection directly affects the safety and service life of the project. Before hot-melt welding or electrofusion welding of pipes, it is necessary to grind the pipe end face to remove surface oil and irregular burrs, and ensure the cleanliness and flatness of the weld end face. Existing grinding equipment usually uses handheld angle grinders or fixed belt sanders. During operation, the grinding head needs to be moved manually along the circumference of the pipe opening to perform rough grinding and fine grinding on the inner and outer walls of the pipe respectively. In order to improve grinding efficiency, in recent years, special equipment for simultaneous grinding of inner and outer walls has emerged. It uses a rotating arm to drive the inner and outer grinding heads to move along the pipe wall at the same time, so as to complete the inner and outer grinding in one clamping. The key technologies of this type of equipment are the adaptability of the grinding head to the pipe wall, the consistent control of the grinding depth, and the lightweight of the drive system.

[0003] However, existing internal and external synchronous grinding equipment still has the following technical shortcomings: First, pipes are prone to out-of-roundness during production, transportation, and storage, i.e., ellipticity deviation or irregular deformation. Most existing grinding heads adopt a rigid fixed structure, which cannot automatically adjust the radial position according to the pipe wall contour, resulting in uneven grinding pressure and over-grinding or under-grinding at elliptical pipe walls, affecting the consistency of grinding quality. Second, the control of grinding depth usually relies on mechanical limits or manual adjustment, which is difficult to dynamically adjust during the grinding process. When there are local protrusions or depressions in the pipe wall, the grinding head is prone to jamming or detachment, making adaptive grinding impossible. Third, existing equipment is mostly driven by motors and requires an external power cord, which limits its use in field construction sites. For example, the hoisting procedure and power wiring procedure are relatively cumbersome.

[0004] To address the aforementioned issues, a device for simultaneous internal and external grinding of PE pipes is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, a device for simultaneous internal and external grinding of PE pipes is provided. This technical solution solves the problems mentioned in the background technology.

[0006] To achieve the above objectives, the present invention can be implemented using the following technical solutions: This invention provides a device for simultaneous internal and external grinding of PE pipes, comprising: The centrifugal grinding assembly includes two horizontally arranged cutter shafts, each cutter shaft having a radially retractable grinding cutter at one end, and a hydraulic motor reducer connected to the other end of each cutter shaft to drive its rotation. The support assembly includes a cantilever base for suspension and a mounting bracket mounted on the cantilever base. A main shaft is rotatably connected inside the mounting bracket. A swing arm is fixedly connected to one end of the main shaft, and a hydraulic motor reducer II that drives its rotation is connected to the other end. The housing of the hydraulic motor reducer II is fixedly connected to the mounting bracket. The adjustment assembly includes a slide plate that can move along the length of the swing arm, a second hydraulic cylinder for driving the slide plate, the second hydraulic cylinder being fixedly mounted on the swing arm, and a cutter shaft adjustment mechanism provided on the slide plate for supporting two cutter shafts and adjusting the distance between the two cutter shafts. Each cutter shaft is also rotatably connected to a floating guide wheel at its end.

[0007] Furthermore, a slide is fixedly connected to one end of each cutter shaft, and the grinding cutter is slidably connected to the slide along the radial direction of the cutter shaft. The side of the grinding cutter facing the cutter shaft is connected to the cutter shaft through a spring. Under normal conditions, the spring retracts the grinding cutter into the slide.

[0008] Furthermore, the cutter shaft adjustment mechanism includes two sliders slidably connected to both sides inside the slide plate, two cutter shafts rotatably connected to the two sliders respectively, the housings of two hydraulic motor reducers are fixedly connected to the two sliders respectively, and springs are provided on the side of the two sliders that are far apart from each other. One end of the spring is connected to the slider and the other end is connected to the corresponding end of the slide plate. A bidirectional extending hydraulic cylinder is fixedly connected to the middle of the slide plate to push the two sliders away from each other to adjust the distance between the cutter shafts. Under normal conditions, the elastic force of spring two causes the two sliders to move closer together.

[0009] Furthermore, under normal conditions, the elastic force of spring one causes the distance D1 between the farthest end of the carriage away from the cutter shaft and the center of the cutter shaft to satisfy the following condition with respect to the radius R1 of the floating guide wheel: D1 < R1.

[0010] Furthermore, it also includes an intelligent hydraulic control system, which is connected to the centrifugal grinding assembly, the support assembly, and the adjustment assembly. The intelligent hydraulic control system includes an electronic control unit, a hydraulic parameter detection unit electrically connected to the electronic control unit, and an electro-hydraulic control valve fixedly installed on the top of the mounting bracket. The hydraulic parameter detection unit is used to detect the working parameters of the hydraulic system in real time and feed them back to the electronic control unit. The electro-hydraulic control valve adjusts the hydraulic output according to the instructions of the electronic control unit. The electronic control unit controls the output of the electro-hydraulic control valve in a closed loop according to the signal fed back by the hydraulic parameter detection unit, so as to precisely adjust the grinding speed and torque.

[0011] Furthermore, the electro-hydraulic control valve is an intelligent digital flow control valve, and the hydraulic parameter detection unit is a pressure sensor integrated into the valve body of the intelligent digital flow control valve. The intelligent digital flow control valve forms a closed-loop control circuit based on preset parameters and real-time feedback from the pressure sensor to compensate for load fluctuations.

[0012] Furthermore, two horizontal bars are fixedly connected side by side to the top of the mounting frame, and a base is fixedly connected to the cantilever part of the cantilever base. A fixed hook is fixedly connected to one end of the bottom of the base, and a movable hook is rotatably connected to the other end. A hydraulic cylinder is rotatably connected to one side of the movable hook. The cylinder body of the hydraulic cylinder is rotatably connected inside the base. The fixed hook and the movable hook abut against the two horizontal bars respectively to form a stable connection.

[0013] As described above, the features and advantages of the synchronous internal and external grinding equipment for PE pipes in this invention are: By setting two horizontally parallel cutter shafts, each with a radially retractable grinding blade at its end, and a floating guide wheel on the cutter shaft, along with a cutter shaft spacing adjustment mechanism consisting of a bidirectional extending hydraulic cylinder and two springs, the grinding equipment can quickly adapt to different pipe diameters and float to follow the elliptical deformation of the pipe wall. When the pipe has ellipticity or local unevenness, the floating guide wheel always keeps close to the pipe wall under the elastic force of the two springs, guiding the grinding blade to automatically adjust its radial position. This solves the defects of existing rigid grinding heads, such as uneven grinding pressure, missed grinding, or over-grinding caused by pipe wall deformation, and ensures the uniformity and consistency of the grinding layer thickness.

[0014] By incorporating a spring to retract the grinding blade into the carriage when not in operation, and utilizing the centrifugal force generated by the rotation of the blade shaft to overcome the spring force and extend the grinding blade, a closed-loop control circuit is formed using an intelligent digital flow control valve and a pressure sensor. This circuit detects load fluctuations in real time and automatically adjusts the hydraulic motor speed, achieving self-adjustment of centrifugal force and constant speed control for grinding depth. The operator can steplessly adjust the radial extension of the grinding blade by controlling the speed of the hydraulic motor. This solves the shortcomings of existing equipment that rely on mechanical limits or manual adjustment for grinding depth and cannot dynamically respond, significantly improving the adaptability to pipes of different wall thicknesses and the grinding accuracy. Furthermore, this grinding equipment is compatible with the quick-connect coupling system of existing excavators, ensuring fast and stable existing mature system support for both lifting and transferring pipes and providing hydraulic power for hydraulic grinding when used on outdoor construction sites, making it more convenient to use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the synchronous internal and external grinding equipment for PE pipes as shown in this invention. Figure 2 for Figure 1 Another perspective diagram of the structure; Figure 3 This is a schematic diagram of the centrifugal grinding component structure of the internal and external synchronous grinding equipment for PE pipes shown in this invention. Figure 4 This is a schematic diagram of the support component structure of the internal and external synchronous grinding equipment for PE pipes shown in this invention. Figure 5 for Figure 4 A schematic diagram of the exploded structure of the middle part; Figure 6 This is a schematic diagram of the adjustment component structure of the internal and external synchronous grinding equipment for PE pipes shown in this invention. Figure 7 for Figure 6 A schematic diagram of the exploded structure of the middle part; Figure 8 This is a schematic diagram of the state in which the spring one retracts the grinding blade inside the carriage under normal conditions in an embodiment of the present invention.

[0016] The reference numerals in the accompanying drawings of this invention are as follows: Centrifugal grinding assembly: 11. Cutter shaft; 12. Carriage; 13. Grinding cutter; 14. Spring 1; 15. Hydraulic motor reducer 1; Support components: 21. Mounting bracket; 22. Spindle; 23. Swing arm; 24. Hydraulic motor reducer II; 25. Crossbar; 26. Cantilever base; 27. Fixed hook; 28. Movable hook; 29. ​​Hydraulic cylinder I; Adjustment components: 31. Slide plate; 32. Hydraulic cylinder II; 33. Slider; 34. Spring II; 35. Bidirectional extension hydraulic cylinder; 36. Floating guide wheel; Intelligent hydraulic control system: 41. Electro-hydraulic control valve. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] See Figures 1-8 As shown in the figure, an embodiment of the present invention is provided, and a PE pipe internal and external synchronous grinding device will be described in detail below: See Figures 1-2 As shown, a device for simultaneous internal and external grinding of PE pipes includes: Centrifugal grinding components, see Figures 1-3As shown, it includes two horizontally arranged cutter shafts 11. Each cutter shaft 11 has a radially retractable grinding blade 13 at one end, and the other end of each cutter shaft 11 is connected to a hydraulic motor reducer 15 that drives its rotation. The hydraulic motor reducer 15 is an integrated hydraulic drive unit, consisting of a low-speed, high-torque hydraulic motor and a planetary reducer. Its output shaft is fixedly connected to the cutter shaft 11 via a flat key or spline, and is used to convert hydraulic energy into rotational mechanical energy to drive the grinding blade 13 to rotate at high speed. This integrated structure is a conventional design in the field of hydraulic transmission and will not be described in detail here.

[0019] Supporting components, see Figures 4-5 As shown, the device includes a cantilever base 26 for suspension and fixation (the cantilever base 26 integrates a hydraulic station to provide hydraulic driving force, which is prior art), and a mounting bracket 21 mounted on the cantilever base 26. A main shaft 22 is rotatably connected inside the mounting bracket 21. One end of the main shaft 22 is fixedly connected to a swing arm 23, and the other end is connected to a hydraulic motor reducer 24 that drives its rotation. The housing of the hydraulic motor reducer 24 is fixedly connected to the mounting bracket 21. The cantilever base 26 is a welded steel structure, and the mounting bracket 21 is welded from high-strength steel plates. The main shaft 22 is supported internally by a pair of tapered roller bearings to withstand radial loads and axial thrust. The hydraulic motor reducer 24 adopts an integrated unit of the same model as the hydraulic motor reducer 15, which is used to drive the main shaft 22 and the swing arm 23 to move around the axis of the main shaft 22, thereby driving the grinding blade 13 to move circumferentially along the PE pipe. The above bearing selection and hydraulic motor installation method are well known in the art and will not be described in detail.

[0020] Adjustment components, see Figures 6-7 As shown, the system includes a slide plate 31 that can move along the length of the swing arm 23, a second hydraulic cylinder 32 for driving the slide plate 31, the second hydraulic cylinder 32 being fixedly mounted on the swing arm 23, and a cutter shaft 11 adjustment mechanism mounted on the slide plate 31 for supporting two cutter shafts 11 and adjusting the distance between the two cutter shafts 11. Each cutter shaft 11 is also rotatably connected to a floating guide wheel 36 at its end. The second hydraulic cylinder 32 is a double-acting hydraulic cylinder, with its cylinder body fixedly connected to the swing arm 23 via a trunnion, and its piston rod end being threadedly connected to the slide plate 31. By controlling the direction and flow of hydraulic oil, the position of the slide plate 31 on the swing arm 23 can be precisely adjusted, thereby adjusting the axial feed of the grinding cutter 13 relative to the pipe end face. The floating guide wheel 36 is made of wear-resistant nylon or polyurethane material, and its rim makes rolling contact with the inner and outer walls of the pipe, used to guide the grinding cutter 13 to move circumferentially along the pipe and maintain a constant gap with the pipe wall. The axle of the floating guide wheel 36 is fixedly connected to the end of the cutter shaft 11 via a bearing seat. This is a conventional mechanical design and will not be described in detail.

[0021] Furthermore, a slide 12 is fixedly connected to one end of each cutter shaft 11. The grinding cutter 13 is slidably connected to the slide 12 along the radial direction of the cutter shaft 11. The side of the grinding cutter 13 facing the cutter shaft 11 is connected to the cutter shaft 11 by a spring 14. Under normal conditions, the spring 14 causes the grinding cutter 13 to be retracted inside the slide 12. The slide 12 has a structure with a guide groove. One end of the slide is fixed to the cutter shaft 11 by welding. The inner wall of the slide 12 is machined with a straight slide rail extending radially along the cutter shaft 11 to ensure that the grinding cutter 13 can only move radially and cannot rotate. The spring 14 is a cylindrical helical compression spring. One end of the spring is connected to the spring seat on the back of the grinding cutter 13, and the other end is connected to the side of the cutter shaft 11.

[0022] For further details, please refer to [link / reference]. Figures 6-7 As shown, the cutter shaft 11 adjustment mechanism includes two sliders 33 slidably connected to both sides inside the slide plate 31. Two cutter shafts 11 are rotatably connected to the two sliders 33 respectively. The housings of two hydraulic motor reducers 15 are fixedly connected to the two sliders 33 respectively. A spring 34 is provided on the side of each slider 33 that is far apart from each other. One end of the spring 34 is connected to the slider 33, and the other end is connected to the corresponding end of the slide plate 31. A bidirectional extending hydraulic cylinder 35 is fixedly connected to the middle of the slide plate 31, used to push the two sliders 33 away from each other to adjust the distance between the cutter shafts 11. In the normal state, the elastic force of the spring 34 causes the two sliders 33 to move closer together. The cylindrical helical compression spring pushes the two sliders 33 toward each other, keeping the floating guide wheel 36 pressing against the inside and outside of the pipe wall. The bidirectional extension hydraulic cylinder 35 is a double piston rod hydraulic cylinder, with its middle cylinder body fixedly connected to the slide plate 31. When the bidirectional extension hydraulic cylinder 35 supplies oil, the piston rods extend to both sides simultaneously, overcoming the elastic force of the second spring 34 to push the sliders 33 to both sides, thereby increasing the distance between the two cutter shafts 11 so as to clamp the pipe wall or withdraw them. When the hydraulic cylinder is unloaded, the elastic force of the second spring 34 pushes the sliders 33 back to their original position, causing the floating guide wheel 36 to press against the pipe wall again. The control method of this bidirectional hydraulic cylinder is a conventional hydraulic circuit design and will not be described in detail.

[0023] For further details, please refer to [link / reference]. Figure 8 As shown, under normal conditions, the elastic force of spring 14 causes the distance D1 between the farthest end of the slide 12 away from the cutter shaft 11 and the center of the cutter shaft 11 to satisfy the radius R1 of the floating guide wheel 36: D1 < R1. This relationship ensures that in the non-working state, the rim of the floating guide wheel 36 protrudes beyond the farthest end of the slide 12. When the grinding equipment is close to the pipe, the floating guide wheel 36 contacts the pipe wall first, while the grinding blade 13 remains retracted inside the slide 12. Only when the cutter shaft 11 rotates and generates sufficient centrifugal force will the grinding blade 13 extend to contact the pipe wall for grinding. This geometric relationship can prevent the grinding blade 13 from accidentally scratching the pipe wall in the non-working state, while ensuring that the floating guide wheel 36 always plays a guiding and supporting role.

[0024] For further details, please refer to [link / reference]. Figures 1-2 As shown, it also includes an intelligent hydraulic control system, which is connected to the centrifugal grinding assembly, support assembly, and adjustment assembly respectively. The intelligent hydraulic control system includes an electronic control unit, a hydraulic parameter detection unit electrically connected to the electronic control unit, and an electro-hydraulic control valve 41 fixedly installed on the top of the mounting bracket 21. The hydraulic parameter detection unit is used to detect the working parameters of the hydraulic system in real time and feed them back to the electronic control unit. The electro-hydraulic control valve 41 adjusts the hydraulic output according to the instructions of the electronic control unit. The electronic control unit controls the output of the electro-hydraulic control valve 41 in a closed loop according to the signal fed back by the hydraulic parameter detection unit, so as to accurately adjust the grinding speed and torque. The electronic control unit is a programmable logic controller or an embedded microcontroller, which has preset grinding speed, feed speed, and clamping force parameters corresponding to different pipe diameters and materials. The hydraulic parameter detection unit includes a pressure sensor, a flow sensor, and a temperature sensor installed in the hydraulic pipeline, which are used to collect system pressure, hydraulic motor flow rate, and oil temperature in real time. The electro-hydraulic control valve 41 is a proportional directional valve or a servo valve, which can continuously adjust the valve opening according to the control current, thereby controlling the speed of the hydraulic motor and the thrust of the hydraulic cylinder. The above-mentioned sensors and proportional control technology are common knowledge in the field of hydraulic servo, and will not be described in detail here.

[0025] Furthermore, the electro-hydraulic control valve 41 is an intelligent digital flow control valve. The hydraulic parameter detection unit is a pressure sensor integrated into the valve body of the intelligent digital flow control valve. The intelligent digital flow control valve forms a closed-loop control circuit based on preset parameters and real-time feedback from the pressure sensor to compensate for load fluctuations. The intelligent digital flow control valve integrates a microprocessor, flow meter, and pressure sensor, and can independently complete flow setting and adjustment. The pressure sensor feeds back the detected load pressure signal to the microprocessor inside the valve. The microprocessor automatically adjusts the valve core opening according to the preset flow-pressure characteristic curve, so that the output flow is not affected by load fluctuations, thereby maintaining a constant speed of the grinding tool 13. This digital flow control technology is the development direction of the hydraulic control field in recent years. Specific models, such as Bosch Rexroth's ED type digital valve or similar products, belong to existing technology and will not be described in detail.

[0026] For further details, please refer to [link / reference]. Figures 4-5As shown, two horizontal bars 25 are fixedly connected side-by-side to the top of the mounting frame 21. A base is fixedly connected to the cantilever portion of the cantilever base 26. A fixed hook 27 is fixedly connected to one end of the bottom of the base, and a movable hook 28 is rotatably connected to the other end. A hydraulic cylinder 29 is rotatably connected to one side of the movable hook 28. The cylinder body of the hydraulic cylinder 29 is rotatably connected inside the base. The fixed hook 27 and the movable hook 28 abut against the two horizontal bars 25 to form a stable connection. The horizontal bars 25 are cylindrical steel rods, with both ends welded to the mounting frame 21 or fixed by bolts. The base is a welded steel plate box, and the fixed hook 27 is an L-shaped claw. Its hook abuts against the lower edge of a crossbar 25; the movable hook 28 is a swingable claw, the middle part of which is rotatably connected to the base through a pin, and the tail of the movable hook 28 is hinged to the piston rod of the hydraulic cylinder 29; the hydraulic cylinder 29 is a single-acting spring-return hydraulic cylinder. When it is filled with oil, the piston rod extends, pushing the movable hook 28 to swing toward another crossbar 25 and hook the crossbar 25; when the hydraulic cylinder 29 is unloaded, the spring pushes the piston rod back, and the movable hook 28 is automatically released. This quick-change connection structure facilitates the rapid loading and unloading between grinding equipment and existing engineering equipment such as excavators. It is a conventional hydraulic clamping design and will not be described in detail.

[0027] When the equipment is in normal grinding operation, each hydraulic actuator is connected to the hydraulic station through the electro-hydraulic control valve 41. When the equipment is in an outdoor construction site, each hydraulic actuator is connected to the hydraulic system of excavators and other construction equipment through the electro-hydraulic control valve 41. The excavators and other construction equipment can be used to move the grinding equipment conveniently and adapt to more complex working conditions (excavators and other construction equipment can use quick couplings to quickly connect different hydraulic equipment, which is an existing technical solution).

[0028] Working principle The working process of this equipment is divided into three stages: installation and positioning, parameter setting, and automatic grinding.

[0029] During installation and positioning, the equipment is moved to the end of the pipe to be ground via the cantilever base 26, or the end of the pipe to be ground is moved toward the equipment. Then, according to the outer diameter of the pipe, the hydraulic cylinder 2 32 drives the slide plate 31 to move along the swing arm 23 to adjust the starting position of the grinding blade 13. The two sliders 33 are pushed to move in opposite directions by the bidirectional extension hydraulic cylinder 35 to adjust the distance between the two blade shafts 11 and insert the pipe wall between the two blade shafts 11. Then the bidirectional extension hydraulic cylinder 35 retracts and the spring 2 34 releases its elasticity, so that the floating guide wheel 36 is in close contact with the inner and outer walls of the pipe.

[0030] During the parameter setting stage, the operator inputs parameters such as pipe diameter, wall thickness and material through the electronic control unit. The system automatically calculates the required grinding speed and feed rate. The hydraulic system supplies oil to the hydraulic motor reducer 24, driving the main shaft 22 and swing arm 23 to rotate slowly. At the same time, the hydraulic motor reducer 15 drives the cutter shaft 11 to rotate the grinding cutter 13. At this time, due to the low speed, the centrifugal force is insufficient to overcome the elastic force of the spring 14. The grinding cutter 13 is still retracted inside the slide 12, and only the floating guide wheel 36 rolls along the pipe wall for pre-inspection.

[0031] During the automatic grinding stage, the control system instructs the hydraulic motor reducer 15 to accelerate to the working speed. The centrifugal force generated by the high-speed rotation of the cutter shaft 11 overcomes the elastic force of the spring 14, throwing the grinding cutter 13 radially out, so that the cutting edge of the grinding cutter 13 presses against the pipe wall. At the same time, the hydraulic motor reducer 24 drives the swing arm 23 to swing around the pipe circumferentially at a set speed (it should be noted that the number of continuous rotations of the swing arm 23 in the same direction should be controlled, for example, 1 or 2 rotations, to avoid excessive winding of the pipe). The grinding cutter 13 grinds the inner and outer walls of the pipe synchronously with the movement of the swing arm 23. During the grinding process, since the pipe wall is between the two cutter shafts 11, i.e., the slider 33, under the action of the spring 24, the floating guide wheel 36 will always be in contact with the pipe wall. The pressure sensor integrated into the intelligent digital flow control valve detects the load pressure in real time. For example, when there is a protrusion on the pipe wall, the load on the rotation of the cutter shaft 11 increases, i.e., the rotational resistance. The microprocessor in the valve automatically adjusts the valve core opening and increases the hydraulic motor flow to compensate for the decrease in speed and keep the grinding linear speed constant. After grinding, the hydraulic motor reducer 15 slows down, the centrifugal force decreases, and the spring 14 pulls the grinding cutter 13 back into the slide 12. The cutter shaft 11 stops rotating, and the bidirectional hydraulic cylinder 35 pushes the two sliders 33 to move back and forth again, adjusting the distance between the two cutter shafts 11 and removing the pipe wall between the two cutter shafts 11.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for simultaneous internal and external grinding of PE pipes, characterized in that, include: The centrifugal grinding assembly includes two horizontally arranged cutter shafts (11), one end of each cutter shaft (11) is provided with a radially extendable grinding cutter (13), and the other end of each cutter shaft (11) is connected to a hydraulic motor reducer (15) that drives its rotation. The support assembly includes a cantilever base (26) for suspension and fixation, and a mounting bracket (21) mounted on the cantilever base (26). A main shaft (22) is rotatably connected inside the mounting bracket (21). A swing arm (23) is fixedly connected to one end of the main shaft (22), and a hydraulic motor reducer (24) that drives its rotation is connected to the other end. The adjustment assembly includes a slide plate (31) that can move along the length of the swing arm (23), a hydraulic cylinder (32) for driving the slide plate (31) to move, and a cutter shaft (11) adjustment mechanism provided on the slide plate (31) for supporting two cutter shafts (11) and adjusting the distance between the two cutter shafts (11). Each cutter shaft (11) is also rotatably connected to a floating guide wheel (36) at its end.

2. The internal and external synchronous grinding equipment for PE pipes according to claim 1, characterized in that: Each cutter shaft (11) is fixedly connected to a slide (12) at one end. The grinding cutter (13) is slidably connected to the slide (12) along the radial direction of the cutter shaft (11). The side of the grinding cutter (13) facing the cutter shaft (11) is connected to the cutter shaft (11) through a spring (14). Under normal conditions, the spring (14) causes the grinding cutter (13) to be retracted inside the slide (12).

3. The internal and external synchronous grinding equipment for PE pipes according to claim 1, characterized in that: The cutter shaft (11) adjustment mechanism includes two sliders (33) slidably connected to both sides inside the slide plate (31). The two cutter shafts (11) are rotatably connected to the two sliders (33). A spring (34) is provided on the side of the two sliders (33) that are far apart from each other. One end of the spring (34) is connected to the slider (33), and the other end is connected to the corresponding end of the slide plate (31). A bidirectional extending hydraulic cylinder (35) is fixedly connected to the middle of the slide plate (31) to push the two sliders (33) away from each other to adjust the distance between the cutter shafts (11). Under normal conditions, the elastic force of spring 2 (34) causes the two sliders (33) to move closer together.

4. The internal and external synchronous grinding equipment for PE pipes according to claim 1, characterized in that: Under normal conditions, the elastic force of spring 1 (14) causes the distance D1 between the farthest end of the slide (12) away from the cutter shaft (11) and the center of the cutter shaft (11) to satisfy the radius R1 of the floating guide wheel (36): D1 < R1.

5. A synchronous internal and external grinding device for PE pipes according to claim 1, characterized in that: It also includes an intelligent hydraulic control system, which is connected to the centrifugal grinding assembly, the support assembly and the adjustment assembly respectively. The intelligent hydraulic control system includes an electronic control unit, a hydraulic parameter detection unit electrically connected to the electronic control unit, and an electro-hydraulic control valve (41) fixedly installed on the top of the mounting bracket (21). The hydraulic parameter detection unit is used to detect the working parameters of the hydraulic system in real time and feed them back to the electronic control unit. The electro-hydraulic control valve (41) adjusts the hydraulic output according to the instructions of the electronic control unit. The electronic control unit controls the output of the electro-hydraulic control valve (41) in a closed loop according to the signal fed back by the hydraulic parameter detection unit, so as to accurately adjust the grinding speed and torque.

6. A synchronous internal and external grinding device for PE pipes according to claim 5, characterized in that: The electro-hydraulic control valve (41) is an intelligent digital flow control valve. The hydraulic parameter detection unit is a pressure sensor integrated into the valve body of the intelligent digital flow control valve. The intelligent digital flow control valve forms a closed-loop control circuit based on the preset parameters and the real-time feedback of the pressure sensor to compensate for load fluctuations.

7. A synchronous internal and external grinding device for PE pipes according to claim 1, characterized in that: Two horizontal bars (25) are fixedly connected side by side to the top of the mounting bracket (21). The cantilever part of the cantilever base (26) is fixedly connected to the base. A fixed hook (27) is fixedly connected to one end of the bottom of the base, and a movable hook (28) is rotatably connected to the other end. A hydraulic cylinder (29) is rotatably connected to one side of the movable hook (28). The cylinder body of the hydraulic cylinder (29) is rotatably connected inside the base. The fixed hook (27) and the movable hook (28) abut against the two horizontal bars (25) respectively to form a stable connection.

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