Grinding device

Abstract

The invention discloses a grinding device which is used for grinding the end face of the inner wall of a steel pipe, the grinding device comprises a positioning mechanism and a grinding seat connected with the positioning mechanism, the grinding seat abuts against the end face of the inner wall of the steel pipe, and the grinding seat can rotate relative to the axis of the steel pipe so as to grind the end face of the inner wall of the steel pipe; the positioning mechanism comprises a screw rod, an expansion sleeve and an elastic piece, and one end of the screw rod is connected with the grinding seat; the expansion sleeve is arranged at the end, away from the grinding base, of the screw and abuts against the end face of the inner wall of the steel pipe, and a containing groove is formed in the middle of the expansion sleeve. The elastic piece is arranged in the containing groove, and the elastic piece and the expansion sleeve abut against the inner wall of the steel pipe. The elastic pieces are arranged to be springs, and the number of the springs is configured to be at least two. According to the grinding device, high-precision coaxial positioning and stable supporting of the end face of the inner wall of the steel pipe are achieved, the problem of poor sealing caused by eccentric grinding is solved, and the clamping efficiency is improved. The whole device is suitable for inner wall end face machining in deep hole or space limited occasions.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pipeline processing, and particularly relates to a grinding device. BACKGROUND

[0002] In key fields such as hydraulic systems and precision machinery, the smoothness of the inner wall and the port of the steel pipe plays a crucial role, as it directly affects the sealing effect, fluid resistance and fatigue life of the components. Currently, the grinding technology for the inner wall and the end face of the steel pipe mainly relies on manual grinding or the method of fixing sandpaper with a simple clamp. However, these traditional methods have obvious shortcomings: 1. Insufficient positioning accuracy: Whether it is manual operation or the use of a simple clamp, it is difficult to ensure that the grinding tool is strictly coaxial with the steel pipe, which can easily lead to eccentric grinding and affect the installation and sealing effect of the sealing element.

[0003] 2. Low efficiency and poor consistency: Manual grinding not only has high labor intensity, but also highly depends on the experience of the operator, making it difficult to ensure the consistency of batch products.

[0004] Therefore, there is an urgent need to design a grinding device to solve the above-mentioned problems. SUMMARY

[0005] One object of the present application is to provide a grinding device that can improve positioning accuracy.

[0006] Another object of the present application is to provide a grinding device that does not require external clamps or complex adjustments, improving clamping efficiency.

[0007] To achieve the above objects, the specific technical scheme of a grinding device of the present application is as follows: A grinding device for grinding the inner wall and end face of a steel pipe, the grinding device comprising a positioning mechanism and a grinding seat connected to the positioning mechanism, the grinding seat abutting against the inner wall and end face of the steel pipe, and the grinding seat being capable of rotating relative to the axis of the steel pipe to grind the inner wall and end face of the steel pipe; The positioning mechanism comprises: a screw, one end of the screw being connected to the grinding seat; a sleeve, the sleeve being provided at the end of the screw away from the grinding seat, the sleeve abutting against the inner wall of the steel pipe, and a receiving groove being provided at the middle position of the sleeve; a resilient member, the resilient member being provided in the receiving groove, the resilient member and the sleeve both abutting against the inner wall of the steel pipe, the resilient member being configured as a spring and the number of the springs being configured as at least two.

[0008] Furthermore, the positioning mechanism also includes a conical nut and a conical shaft, the conical nut and the conical shaft respectively abutting against the expansion sleeve, and both the conical nut and the conical shaft are sleeved on the screw.

[0009] Furthermore, tapered grooves are provided on both sides of the expansion sleeve, and the tapered nut and the tapered shaft are respectively provided in the tapered grooves.

[0010] Furthermore, the grinding base includes a grinding base and a conical part. The inclined end of the conical part abuts against the inner wall end face of the steel pipe. An avoidance groove is provided in the grinding base. The end of the conical shaft away from the conical groove can extend into the avoidance groove and abut against the grinding base.

[0011] Furthermore, the grinding seat also includes a guide sleeve, which is connected to the tapered portion and is sleeved on the outside of the tapered shaft and abuts against the tapered shaft.

[0012] Furthermore, the screw includes a first limiting section and a second limiting section, which are located at both ends of the screw. Each of the first and second limiting sections is provided with a limiting part, which is used to prevent the expansion sleeve and the grinding seat from disengaging from the screw.

[0013] Furthermore, the screw also includes a first mounting section and a second mounting section. The first mounting section is provided with threads and is close to the first limiting section. The second mounting section is close to the second limiting section. The first mounting section is used for threaded connection with the tapered nut, and the second mounting section is inserted into the tapered shaft.

[0014] Furthermore, the grinding device also includes a transmission mechanism connected to the grinding seat, which drives the grinding seat to rotate relative to the axis of the steel pipe to grind the inner wall end face of the steel pipe.

[0015] Furthermore, the transmission mechanism includes: A drive rod, the end of which is provided with a universal ball; A connecting seat is provided with a spherical groove for matching the universal ball, and the connecting seat is detachably connected to the grinding seat; The drive rod is connected to the connecting seat via the universal ball and the spherical groove, thereby driving the connecting seat and the grinding seat to rotate.

[0016] Furthermore, the transmission mechanism also includes a limiting pin, which passes through the connecting seat and the universal ball in sequence. The limiting pin can limit the universal ball to be located in the spherical groove, and the universal ball can rotate around the limiting pin in the spherical groove.

[0017] The grinding device of this invention has the following advantages: It achieves high-precision coaxial positioning and stable support for the inner wall end face of steel pipes. By directly contacting the grinding seat against the inner wall end face of the steel pipe, and with a rotatable design, it ensures that the grinding tool remains aligned with the steel pipe axis throughout the grinding process, avoiding sealing problems caused by eccentric grinding. The positioning mechanism adopts a combination structure of "screw + expansion sleeve + elastic element," utilizing the elastic tension of the expansion sleeve on the inner wall of the steel pipe to achieve rapid centering and clamping, eliminating the need for external clamps or complex adjustments, thus improving clamping efficiency. The overall structure is compact, suitable for inner wall end face machining in deep holes or space-constrained situations, and particularly suitable for the post-processing of precision steel pipes used in hydraulic systems. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the grinding apparatus of the present invention; Figure 2 This is a schematic diagram of the screw structure of the present invention; Figure 3 This is a schematic diagram of the grinding device of the present invention; Figure 4 This is a schematic diagram of the transmission mechanism of the present invention.

[0019] Explanation of markings in the diagram: Positioning mechanism; 11. Screw; 111. First limiting section; 112. Second limiting section; 113. First mounting section; 114. Second mounting section; 12. Expansion sleeve; 13. Elastic element; 141. Conical nut; 142. Conical shaft; 2. Grinding base; 21. Grinding substrate; 22. Conical part; 23. Guide seat sleeve; 3. Transmission mechanism; 31. Drive rod; 311. Universal ball joint; 32. Connecting seat; 33. Limit pin; 100. Steel pipe. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0022] The following is a reference to the appendix. Figure 1 To be continued Figure 4 A grinding apparatus of the present invention is described.

[0023] This embodiment provides a grinding device. Figure 1 This is a cross-sectional view of the grinding apparatus in this embodiment, as shown below. Figure 1 As shown, the grinding device is used to grind the inner wall end face of the steel pipe 100. The grinding device includes a positioning mechanism 1 and a grinding seat 2 connected to the positioning mechanism 1. The grinding seat 2 abuts against the inner wall end face of the steel pipe 100, and the grinding seat 2 can rotate relative to the axis of the steel pipe 100 to grind the inner wall end face of the steel pipe 100. The positioning mechanism 1 includes a screw 11, an expansion sleeve 12, and an elastic element 13. One end of the screw 11 is connected to the grinding seat 2. The expansion sleeve 12 is located at the end of the screw 11 away from the grinding seat 2 and abuts against the inner wall end face of the steel pipe 100. A receiving groove is provided in the middle of the expansion sleeve 12. The elastic element 13 is located in the receiving groove, and both the elastic element 13 and the expansion sleeve 12 abut against the inner wall of the steel pipe 100. The elastic element 13 is a spring, and the number of springs is configured to be at least two.

[0024] Understandably, this grinding device achieves high-precision coaxial positioning and stable support for the inner wall end face of the steel pipe 100. By directly abutting the grinding seat 2 against the inner wall end face of the steel pipe 100, and with its rotatable design, it ensures that the grinding tool remains aligned with the axis of the steel pipe 100 during the grinding process, avoiding sealing problems caused by eccentric grinding. The positioning mechanism 1 adopts a combination structure of "screw 11 + expansion sleeve 12 + elastic element 13". It utilizes the elastic tension of the expansion sleeve 12 on the inner wall of the steel pipe 100 to achieve rapid centering and clamping, eliminating the need for external fixtures or complex adjustments, thus improving clamping efficiency. The overall structure is compact and suitable for inner wall end face processing in deep hole or space-constrained situations, and is particularly suitable for the post-processing of precision steel pipes 100 used in hydraulic systems.

[0025] It should be noted that when dealing with steel pipes of different specifications 100, expansion sleeves of different specifications 12 can be used to adapt to changes in pipe diameter.

[0026] Furthermore, such as Figure 1As shown, the positioning mechanism 1 also includes a conical nut 141 and a conical shaft 142. The conical nut 141 and the conical shaft 142 abut against the expansion sleeve 12 respectively, and both the conical nut 141 and the conical shaft 142 are sleeved on the screw 11.

[0027] It is understandable that by applying axial pressure to the expansion sleeve 12 from both sides through the conical nut 141 and the conical shaft 142, the expansion sleeve 12 will undergo radial expansion deformation, thereby firmly fitting the inner wall of the steel pipe 100 and significantly improving the clamping rigidity and torsional resistance.

[0028] It should be noted that the tapered surface fit between the tapered nut 141 and the expansion sleeve 12 typically has a self-locking function, maintaining a clamped state even under grinding and vibration environments to prevent loosening and falling off. The double-sided clamping method makes the expansion sleeve 12 more evenly stressed, avoiding uneven loads or localized wear caused by unilateral compression, thus extending its service life. The threaded connection method facilitates disassembly and replacement of components, making maintenance convenient and reducing operating costs.

[0029] Furthermore, such as Figure 1 As shown, tapered grooves are provided on both sides of the expansion sleeve 12, and tapered nut 141 and tapered shaft 142 are respectively provided in the tapered grooves.

[0030] Understandably, the tapered groove and the tapered nut 141 form a precise tapered surface fit, guiding the expansion sleeve 12 to generate controllable radial expansion during axial compression, ensuring a smooth and jam-free tightening process. The groove structure restricts the position of the tapered nut 141, preventing it from shifting or tilting during rotation, improving assembly accuracy and repeatability. This structure effectively concentrates the stress transmission path, reducing the risk of cracking of the expansion sleeve 12 due to localized stress concentration, and enhancing the overall structural reliability. It provides good guiding and centering performance, further ensuring the coaxiality of the grinding seat 2 and the steel pipe 100 axis.

[0031] Furthermore, such as Figure 1 As shown, the grinding base 2 includes a grinding base 21 and a conical part 22. The inclined end of the conical part 22 abuts against the inner wall end face of the steel pipe 100. A relief groove is provided in the grinding base 21. The end of the conical shaft 142 away from the conical groove can extend into the relief groove and abut against the grinding base 21.

[0032] During assembly, the elastic element is first inserted into the receiving grooves at both ends of the expansion sleeve 12 to make it an easy-to-remove component. Then, each piece of abrasive paper is attached to the outer end face of the conical part 22. Next, the conical nut 141 and the conical shaft 142 are placed in the conical grooves on both sides of the expansion sleeve 12 to make the three align. The abrasive paper can contact and grind the inner wall end face of the steel pipe 100 during the rotation of the grinding seat 2. It should be noted that in actual operation, different specifications of abrasive paper can be selected according to the needs of different working conditions. This embodiment does not make specific limitations.

[0033] It should be noted that the conical structure has a certain degree of self-alignment capability. Even if there is a slight deviation in the initial installation, it can automatically correct the position during the clamping process, improving the consistency of grinding quality. The design of the clearance groove allows the screw 11 to penetrate deep into the grinding substrate 21 for connection, ensuring connection strength without protruding beyond the grinding surface, thus avoiding interference with the end face of the steel pipe 100 or affecting the grinding trajectory. The high degree of structural integration simplifies the connection structure and reduces the number of parts and potential failure points.

[0034] Furthermore, such as Figure 1 As shown, the grinding seat 2 also includes a guide sleeve 23, which is connected to the conical part 22. The guide sleeve 23 is sleeved on the outside of the conical shaft 142 and abuts against the conical shaft 142.

[0035] It is understandable that the guide seat sleeve 23 is provided with a guide hole, the conical shaft 142 includes a cylindrical surface, the guide hole of the grinding seat 2 contacts the cylindrical surface of the conical shaft 142 to form a stable support point, and prevent the grinding seat 2 from shaking or sinking during the grinding process.

[0036] Understandably, the guide sleeve 23 acts as a force transmission bridge between the grinding seat 2 and the positioning mechanism 1, effectively transferring the axial and radial loads generated during the grinding process to the tapered nut 141 and the screw 11. This prevents the grinding seat 2 from bearing the entire load alone, which could lead to deformation or damage. The abutment structure enhances the rigid connection of the overall structure and improves stability under dynamic operation, making it particularly suitable for high-speed or heavy-duty grinding scenarios. It also facilitates modular design; the grinding seat 2 can be quickly installed or replaced via the guide sleeve 23 to adapt to different grinding needs (such as rough grinding and fine grinding).

[0037] Figure 2 This is a schematic diagram of the screw structure in this embodiment; Furthermore, such as Figure 1 and Figure 2 As shown, the screw 11 includes a first limiting section 111 and a second limiting section 112. The first limiting section 111 and the second limiting section 112 are located at both ends of the screw 11. Each of the first limiting section 111 and the second limiting section 112 is provided with a limiting part, which is used to prevent the expansion sleeve 12 and the grinding seat 2 from disengaging from the screw 11.

[0038] Understandably, the limiting parts (such as steps or retaining rings) form physical barriers at both ends of the screw 11, effectively preventing key components such as the expansion sleeve 12 and grinding seat 2 from accidentally dislodging during installation, disassembly, or high-speed rotation, greatly improving operational safety and avoiding safety accidents caused by flying parts. The limiting structure is simple and reliable, reducing costs and maintenance workload. It ensures that all components are arranged and fixed in an orderly manner in the axial direction, improving assembly accuracy and operational stability.

[0039] Specifically, such as Figure 1 and Figure 2 As shown, the screw 11 also includes a first mounting section 113 and a second mounting section 114. The first mounting section 113 is provided with threads and is close to the first limiting section 111. The second mounting section 114 is close to the second limiting section 112. The first mounting section 113 is used to be threadedly connected to the conical nut 141, and the second mounting section 114 is inserted into the conical shaft 142.

[0040] Understandably, the segmented screw 11 design achieves functional zoning: the first mounting section 113 and the second mounting section 114 are used to support the expansion sleeve 12, the tapered nut 141, and the tapered shaft 142; the first limiting section 111 and the second limiting section 112 provide stops. Each part has a clear division of labor, optimizing mechanical performance. The threaded design of the first mounting section 113 facilitates free adjustment of the expansion sleeve 12, reducing frictional resistance and assembly damage, while ensuring the uniformity of the expansion sleeve 12's expansion.

[0041] It should be noted that by tightening the conical nut 141 and the conical shaft 142 respectively, the clamping force on both sides of the expansion sleeve 12 can be adjusted independently, achieving fine adjustment of the clamping force to adapt to steel pipes 100 of different materials or wall thicknesses. Those skilled in the art will understand that the threaded connection facilitates preload control, and combined with a torque wrench, quantitative clamping can be achieved, improving process controllability. The overall structure supports repeated disassembly and assembly, making it suitable for mass production and multiple batch changeover operations.

[0042] Furthermore, the grinding device also includes a transmission mechanism 3, which is connected to the grinding seat 2 and is used to drive the grinding seat 2 to rotate relative to the axis of the steel pipe 100 in order to grind the inner wall end face of the steel pipe 100.

[0043] Understandably, the above structure introduces a dedicated transmission mechanism 3 to replace manual rotation, thereby mechanizing the grinding process and significantly improving work efficiency and grinding consistency.

[0044] It should be noted that the electric or pneumatic drive method can be set to a constant speed to ensure stable grinding speed and avoid quality fluctuations caused by human factors. The transmission mechanism 3 directly drives the grinding seat 2 to rotate, resulting in a short power transmission path, low loss, fast response, and high energy utilization. It can be integrated with a control system to achieve intelligent control such as timing, speed, and forward / reverse rotation, meeting the grinding processes of different materials and surface roughness requirements.

[0045] Figure 3 This is a schematic diagram of the grinding apparatus in this embodiment; Figure 4 This is a schematic diagram of the transmission mechanism in this embodiment.

[0046] Specifically, such as Figure 1 , Figure 3 andFigure 4 As shown, the transmission mechanism 3 includes a drive rod 31 and a connecting seat 32. The end of the drive rod 31 is provided with a universal ball 311. The connecting seat 32 is provided with a spherical groove for matching the universal ball 311. The connecting seat 32 is detachably connected to the grinding seat 2. The drive rod 31 is connected to the connecting seat 32 through the universal ball 311 and the spherical groove, thereby driving the connecting seat 32 and the grinding seat 2 to rotate.

[0047] Understandably, the universal ball 311 and the spherical groove form a universal joint structure, allowing for a certain angular deviation between the drive rod 31 and the grinding seat 2, thus solving the problem of transmission misalignment caused by installation errors or bending of the steel pipe 100. The connecting seat 32 is detachably connected to the grinding seat 2, facilitating the replacement of suitable grinding heads according to different pipe diameters or grinding tasks, thereby improving equipment flexibility.

[0048] It should be noted that during the grinding process, even if the axis of the steel pipe 100 is slightly offset or slightly bent, the transmission system can still smoothly transmit power, avoiding jamming or shaft breakage. The universal structure absorbs vibration and impact, reducing the impact of dynamic loads on the drive source during the grinding process and protecting the motor or pneumatic motor.

[0049] Alternatively, in some embodiments, such as Figure 1 and Figure 4 As shown, the transmission mechanism 3 also includes a limiting pin 33, which passes through the connecting seat 32 and the universal ball 311 in sequence. The limiting pin 33 can limit the universal ball 311 in the spherical groove, and the universal ball 311 can rotate around the limiting pin 33 in the spherical groove.

[0050] Understandably, the limiting pin 33 serves to fix the axial direction, preventing the universal ball 311 from dislodging from the spherical groove and ensuring the long-term reliability of the transmission connection. The universal ball 311 can rotate freely on the limiting pin 33, achieving flexible swinging in three-dimensional space, further enhancing the system's fault tolerance and adaptability. The limiting pin 33 has a simple yet extremely effective structure, is more durable than adhesive or snap ring methods, and is suitable for high-frequency, high-intensity operating environments.

[0051] It should be noted that this design balances safety and flexibility, and is a key guarantee for achieving stable universal joint transmission.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A grinding apparatus for grinding the inner wall end face of a steel pipe, characterized in that, The grinding device includes a positioning mechanism and a grinding seat connected to the positioning mechanism. The grinding seat abuts against the inner wall end face of the steel pipe, and the grinding seat is rotatable relative to the axis of the steel pipe to grind the inner wall end face of the steel pipe. The positioning mechanism includes: A screw, one end of which is connected to the grinding seat; An expansion sleeve is provided at the end of the screw away from the grinding seat, the expansion sleeve abuts against the inner wall end face of the steel pipe, and a receiving groove is provided in the middle position of the expansion sleeve; An elastic element is disposed within the receiving groove, and both the elastic element and the expansion sleeve abut against the inner wall of the steel pipe; the elastic element is configured as a spring and the number of springs is configured to be at least two.

2. The grinding apparatus according to claim 1, characterized in that, The positioning mechanism further includes a conical nut and a conical shaft, the conical nut and the conical shaft respectively abutting against the expansion sleeve, and both the conical nut and the conical shaft are sleeved on the screw.

3. The grinding apparatus according to claim 2, characterized in that, The expansion sleeve has conical grooves on both sides, and the conical nut and the conical shaft are respectively disposed in the conical grooves.

4. The grinding apparatus according to claim 2, characterized in that, The grinding base includes a grinding base and a conical part. The inclined end of the conical part abuts against the inner wall end face of the steel pipe. A relief groove is provided in the grinding base. The end of the conical shaft away from the conical groove can extend into the relief groove and abut against the grinding base.

5. The grinding apparatus according to claim 4, characterized in that, The grinding seat also includes a guide sleeve, which is connected to the conical portion and is sleeved on the outside of the conical shaft and abuts against the conical shaft.

6. The grinding apparatus according to claim 4, characterized in that, The screw includes a first limiting section and a second limiting section, which are located at both ends of the screw. Each of the first and second limiting sections is provided with a limiting part, which is used to prevent the expansion sleeve and the grinding seat from disengaging from the screw.

7. The grinding apparatus according to claim 6, characterized in that, The screw also includes a first mounting section and a second mounting section. The first mounting section is provided with threads and is close to the first limiting section. The second mounting section is close to the second limiting section. The first mounting section is used for threaded connection with the tapered nut, and the second mounting section is inserted into the tapered shaft.

8. The grinding apparatus according to claim 1, characterized in that, The grinding device also includes a transmission mechanism connected to the grinding base, which drives the grinding base to rotate relative to the axis of the steel pipe to grind the inner wall end face of the steel pipe.

9. The grinding apparatus according to claim 8, characterized in that, The transmission mechanism includes: A drive rod, the end of which is provided with a universal ball; A connecting seat is provided with a spherical groove for matching the universal ball, and the connecting seat is detachably connected to the grinding seat; The drive rod is connected to the connecting seat via the universal ball and the spherical groove, thereby driving the connecting seat and the grinding seat to rotate.

10. The grinding apparatus according to claim 9, characterized in that, The transmission mechanism also includes a limiting pin, which passes through the connecting seat and the universal ball in sequence. The limiting pin can limit the universal ball to be located in the spherical groove, and the universal ball can rotate around the limiting pin in the spherical groove.

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