All-around sander for elongated tubes

Abstract

The application discloses a universal polishing machine suitable for an elongated pipe, which comprises a rack, a profile polishing unit, an end face polishing unit and an inner hole polishing unit. On one hand, based on the position switching of a pressing wheel, the elongated pipe is polished by two profile polishing heads in turn, so that the grinding dead angle is effectively eliminated, the profile polishing forming of the elongated pipe can be realized by one-time clamping, the operation is simple, and the polishing efficiency is high. On the other hand, based on the cooperation of the two profile polishing heads, the positioning limitation in the axial direction of the elongated pipe can be formed synchronously during polishing, the axial deviation generated during the profile polishing of the elongated pipe is effectively reduced, the overall covering polishing is realized, and the position precision of the elongated pipe after the profile polishing is ensured, so that the end face and the inner hole of the elongated pipe can be accurately polished subsequently, and the universal burr removal rate of the elongated pipe is improved.

Description

Technical Field

[0001] This invention belongs to the field of grinding machines, and specifically relates to an all-around grinding machine suitable for slender tubes. Background Technology

[0002] Existing pipe products, such as oil pipes that deliver lubricating oil to automotive gearboxes, require that surface burrs be thoroughly cleaned during processing. Otherwise, if burrs enter the gearbox, it will seriously affect the gearbox's service life and quality.

[0003] Currently, conventional pipe grinding equipment typically uses a set of support wheels and a set of pressure wheels to circumferentially position the pipe product. Then, a grinding head is used, and the contour surface, end face, or inner hole of the pipe product is ground based on the rotation of the grinding head and its axial movement along the pipe product.

[0004] However, in actual processing, the existing technology has the following drawbacks:

[0005] 1. When grinding the contour surface of pipe products, there are grinding dead angles due to the limitation of the pressure roller. After grinding part of the contour surface, the pipe product needs to be removed and clamped again (the product direction needs to be manually adjusted) before the remaining contour surface of the pipe product can be ground. Therefore, it is not only impossible to achieve one-time grinding and forming, but also cumbersome and inefficient.

[0006] 2. As the grinding head moves axially to grind the product's contour surface, the lack of axial restriction on the product makes it prone to axial displacement due to force. This changes the grinding reference, making it difficult to achieve the required grinding accuracy. Furthermore, the grinding stroke formed by the grinding head cannot cover the entire contour surface, directly affecting the implementation of subsequent grinding processes. Consequently, it is difficult to ensure complete burr removal, thus affecting the product yield. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide an improved omnidirectional grinding machine suitable for slender tubes.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] An omnidirectional grinding machine suitable for slender tubes includes a frame, a contour grinding unit, an end face grinding unit, and an internal hole grinding unit. The contour grinding unit includes a support assembly, a pressing assembly, and a contour grinding head. The support assembly includes multiple support wheel sets spaced apart along the length of the slender tube. Each support wheel set includes two support wheels whose axis is parallel to the axis of the slender tube, wherein the two support wheels are side-by-side and roll to support the slender tube. The pressing assembly includes multiple pressing wheels corresponding one-to-one with the support wheel sets and capable of being movably switched to press down on top of the support wheel sets. The slender tube is driven to rotate around its own centerline in cooperation with the rotation of the pressure roller, and the grinding section and the positioning section are formed on the slender tube based on the position switching of the pressure roller; there are two contour grinding heads and their rotation is opposite to that of the slender tube. The grinding stroke formed by the two contour grinding heads extends from both ends of the slender tube to the middle and coincides in the middle of the slender tube. The grinding stroke formed by the two contour grinding heads is less than the length of the grinding section, and the two contour grinding heads grind one after the other. At the same time, one contour grinding head forms the end restriction of the positioning section, and the other contour grinding head grinds along the grinding stroke.

[0010] According to a specific embodiment and preferred aspect of the present invention, the center of the overlapping portion of the section to be ground formed by the sequential switching of the position of the pressure roller, the support center formed by multiple support roller sets, and the center of the slender tube are aligned. This ensures stable support in the middle of the slender tube while grinding the central contour, reducing the probability of deformation.

[0011] Preferably, the length of the slender tube is L, and the length of the section to be ground is L1, where 0.5L≤L1≤0.6L. With this arrangement, the end-contact restraint effect of the positioning section formed by the other contour grinding head is optimal when one contour grinding head is grinding.

[0012] Preferably, there are two support roller sets and two pressure rollers, and in the orthographic projection on the horizontal plane, the two pressure rollers are located between the two support roller sets. Here, the short distance between adjacent pressure rollers facilitates the formation of the optimal grinding stroke when switching the positions of the pressure rollers one after another, and the staggered layout of the upper and lower support rollers and pressure rollers improves the stability of the rotation of the slender tube during grinding.

[0013] Preferably, the pressing assembly further includes multiple power components corresponding to each pressing wheel. Each power component includes a transverse seat that reciprocates horizontally along the direction perpendicular to the length of the slender tube, and a lifting seat that is movably connected to the transverse seat. The pressing wheel is mounted on the corresponding lifting seat and presses down or detaches from the slender tube based on the horizontal transverse movement and the lifting motion.

[0014] According to another specific embodiment and preferred aspect of the present invention, any support wheel assembly further includes a driving member connected to the corresponding support wheel, wherein the driving member drives the support wheel to rotate around its own centerline, and based on the pressing wheel pressing down on the slender tube, each support wheel and the corresponding pressing wheel rotate in the same direction to cooperatively drive the slender tube to rotate. Here, the structure is simple and easy to install and implement.

[0015] According to another specific embodiment and preferred aspect of the present invention, the end face grinding unit and the inner hole grinding unit each include a support mechanism, a pressing mechanism and a grinding mechanism, wherein the structure of the support mechanism is the same as that of the support assembly, and the pressing mechanism includes a plurality of pressure rollers pressing down on the support mechanism and simultaneously pressing down or disengaging from the slender tube, wherein the pressing position formed by the plurality of pressure rollers is aligned vertically with the support position formed by the support mechanism.

[0016] Preferably, the grinding mechanism of the inner hole grinding unit includes two inner hole grinding heads correspondingly disposed at both ends of the slender tube and matching the inner hole of the slender tube. The rotation direction of the two inner hole grinding heads is opposite to that of the slender tube. The grinding stroke formed by the two inner hole grinding heads extends from both ends of the inner hole of the slender tube towards the middle, and the two inner hole grinding heads maintain an end gap and reciprocate along the length of the slender tube to form a grinding zone covering the inner hole wall of the slender tube. Here, because the diameter of the slender tube is small (e.g., the diameter of the oil pipe of an automotive gearbox does not exceed 10 mm) and the tube body is long, any slight vibration caused by external force can easily cause deformation or shaking of the tube body. Therefore, by adopting the bidirectional grinding stroke layout of the two inner hole grinding heads of this application, the full coverage grinding of the inner hole wall is achieved by the end gap of the two grinding heads while reducing tube body offset, and no damage is caused to the inner hole wall of the slender tube.

[0017] Preferably, each internal grinding head has a circumferentially formed grinding body that extends spirally around the centerline of the grinding head, with the two grinding bodies rotating in opposite directions. This facilitates the removal of grinding debris and, based on the opposing rotation directions, creates mutually canceling axial forces, reducing tube body offset.

[0018] Preferably, the support mechanism, pressing mechanism, and grinding mechanism of the internal hole grinding unit constitute an internal hole grinding group, and there are at least two internal hole grinding groups with progressively increasing grinding precision. Here, a precision-progressive grinding method is adopted to reduce damage to the internal hole wall.

[0019] Preferably, the grinding mechanism of the end face grinding unit includes two end face grinding heads correspondingly disposed at both ends of the slender tube. The two end face grinding heads rotate in the opposite direction to the slender tube, and are synchronously moved towards each other to grind or detach from the end faces of the slender tube. Here, bidirectional synchronous grinding or detachment of the end faces of the slender tube enables further correction of the axial position of the slender tube, facilitating the next step of precise internal hole grinding.

[0020] According to another specific embodiment and preferred aspect of the present invention, a contour grinding unit, an end face grinding unit, and an inner hole grinding unit are arranged side by side on a frame to form a contour grinding station, an end face grinding station, and an inner hole grinding station. The grinding machine also includes a transfer unit disposed above each station. The transfer unit includes multiple grippers corresponding to each station and used for picking up and placing slender tubes, and a transfer drive component for driving the grippers to move between each station. During transfer, the multiple grippers move synchronously with a movement distance equal to the distance between adjacent stations, and the slender tubes at each station are synchronously transferred to the adjacent station. Here, multiple slender tubes can simultaneously and sequentially undergo each grinding process.

[0021] According to another specific embodiment and preferred aspect of the invention, the grinding machine further includes a dust collection unit, which includes dust collection pipes correspondingly disposed below the contour grinding unit, the end face grinding unit, and the inner hole grinding unit. The dust collection ports of the dust collection pipes are V-shaped with their openings facing upwards. During grinding, each slender pipe extends into its corresponding dust collection port. This collects the dust generated during grinding, preventing pollution of the workshop environment.

[0022] According to another specific embodiment and preferred aspect of the present invention, the grinding machine further includes a feeding unit connected to the contour grinding unit and a receiving unit connected to the inner hole grinding unit, wherein the feeding unit includes a feeding trough, a centering component for centering the slender tubes, and a loading robot for transferring the slender tubes one by one from the feeding trough to the centering component; the receiving unit includes a receiving trough and a unloading robot for transferring the slender tubes that have completed inner hole grinding one by one to the receiving trough.

[0023] In addition, the centering component includes a support base with multiple V-shaped grooves spaced apart along the length of the slender tube, and centering modules disposed on opposite sides of the support base. The slender tube is transferred from the feeding trough into the V-shaped grooves, and the two centering modules move towards each other along the length of the slender tube and push the two ends of the slender tube to center it.

[0024] Due to the implementation of the above technical solutions, the present invention has the following advantages compared with the prior art:

[0025] Existing technologies for grinding the contour surfaces of pipe products suffer from grinding dead zones due to the limitations of the pressure rollers. After grinding part of the contour surface, the pipe product needs to be removed and re-clamped (requiring manual adjustment of the product orientation) before the remaining contour surface can be ground. Therefore, it is impossible to achieve one-time grinding and forming, which is cumbersome and inefficient. As the grinding head moves axially to grind the product contour surface, the lack of axial restriction causes the product to easily shift in the same direction due to axial force. This not only makes it difficult to achieve the required grinding accuracy, but also prevents the grinding stroke formed by the grinding head from covering the entire contour surface, directly affecting the implementation of subsequent grinding processes. Consequently, it is difficult to ensure complete removal of burrs, which affects the product yield. This application presents a comprehensive structural design for an all-around grinding machine suitable for slender tubes, cleverly addressing the shortcomings and defects of existing technologies. Using this grinding machine, the contour, end face, and inner hole of the slender tube are sequentially ground through a contour grinding unit, an end face grinding unit, and an inner hole grinding unit. During contour grinding, the slender tube is first placed on multiple support roller sets, with two support rollers in each set providing rolling support. Multiple pressure rollers press down on top of the support roller sets, and the rotation of the support rollers and pressure rollers in tandem drives the slender tube to rotate around its centerline. Then, the position of the pressure rollers is switched... A grinding section and a positioning section are formed on a slender tube. One contour grinding head restricts the end of the positioning section, while another contour grinding head grinds the grinding section along the grinding stroke. Then, the position of the pressure roller is switched to form a subsequent grinding section and a positioning section on the slender tube. The first contour grinding head restricts the end of the subsequent positioning section, while another contour grinding head grinds the subsequent grinding section along the grinding stroke. The grinding strokes formed by the sequential grinding extend from both ends of the slender tube toward the middle and coincide in the middle of the slender tube. The sequential grinding strokes are both less than the length of the sequential grinding sections. Therefore, compared with the prior art, the present invention has two advantages. First, based on the position switching of the pressure roller, two contour grinding heads grind the slender tube successively, effectively eliminating grinding dead angles. This allows the slender tube to be contoured and shaped in one clamping, making the operation simple and the grinding efficiency high. Second, based on the cooperation of the two contour grinding heads, positioning constraints can be formed synchronously in the axial direction of the slender tube during grinding, effectively reducing the axial offset caused by contour grinding of the slender tube, achieving full coverage grinding, and ensuring the positional accuracy of the slender tube after contour grinding. This facilitates the subsequent precise grinding of the end face and inner hole of the slender tube, thereby improving the all-round burr removal rate of the slender tube. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the omnidirectional polishing machine suitable for slender tubes in this embodiment;

[0027] Figure 2 for Figure 1 Enlarged schematic diagram of a local part of the structure;

[0028] Figure 3 for Figure 2 Enlarged schematic diagram of a portion of the mid-contour grinding unit;

[0029] Figure 4 This is a schematic diagram showing the pre-grinding of the contour of a slender tube.

[0030] Figure 5 This is a schematic diagram showing the post-grinding of the slender tube's outline.

[0031] The components include: 1. Frame; 2. Feeding unit; 20. Feeding trough; 200. Material replenishment transmission line; 201. Receiving seat; 21. Centering component; 210. Bearing seat; 211. Centering module; 22. Loading robot; 3. Contour grinding unit; 30. Support assembly; z. Support wheel set; 300. Support wheel; 301. Drive component; 31. Pressing assembly; 310. Pressing wheel; 311. Power component; 3110. Transverse moving seat; 3111. Lifting seat; 32. Contour grinding unit. 4. Grinding head; 5. End face grinding unit; 6. Inner hole grinding unit; a. Support mechanism; b. Pressing mechanism; b0. Pressure roller; c. Grinding mechanism; c0. End face grinding head; c1. Inner hole grinding head; d. Dust blowing unit; 6. Dust suction unit; 60. Dust suction pipe; 61. Dust suction hood; 7. Transfer unit; 70. Gripper; 71. Transfer drive; 8. Material receiving unit; 80. Material receiving trough; 81. Unloading robot; G. Slender tube; G1. Grinding section; G2. Positioning section. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0038] like Figures 1 to 5 As shown, the omnidirectional grinding machine for slender tubes in this embodiment includes a frame 1, a feeding unit 2, a contour grinding unit 3, an end face grinding unit 4, an inner hole grinding unit 5, a dust extraction unit 6, a transfer unit 7, and a receiving unit 8.

[0039] Specifically, the contour grinding unit 3, the end face grinding unit 4, and the inner hole grinding unit 5 are arranged side by side and sequentially on the frame 1 to form the contour grinding station, the end face grinding station, and the inner hole grinding station.

[0040] In this example, the feeding unit 2 is connected to the contour grinding unit 3, and the feeding unit 2 includes a feeding trough 20, a centering component 21 for centering the slender tubes G, and a loading robot 22 for transferring the slender tubes G one by one from the feeding trough 20 to the centering component 21.

[0041] In some specific embodiments, the bottom of the feeding trough 20 is inclined, wherein a feeding transmission line 200 is provided on the side of the feeding trough 20 near the upper side of the bottom, and a receiving seat 201 that can move up and down and can receive materials one by one from the feeding trough 20 is provided on the side of the feeding trough 20 near the lower side of the bottom. The feeding transmission line 200 is used to supplement the slender tubes G into the feeding trough 20, and the slender tubes G roll downward and fall one by one onto the receiving seat 201 based on the movement of the receiving seat 201; the centering component 21 includes forming along the length of the slender tube G. The carrier 210 has multiple V-shaped grooves spaced apart in the direction of the slender tube G, and centering modules 211 are set on opposite sides of the carrier 210 along the length of the slender tube G. The loading robot 22 uses conventional grippers, and the slender tube G is transferred from the receiving seat 201 to the V-shaped grooves on the carrier 210 based on the lifting, rotating and lateral movements of the grippers. The two centering modules 211 at both ends move towards each other along the length of the slender tube G and push the two ends of the slender tube G to achieve centering, ensuring accurate transfer and grinding in the subsequent process.

[0042] In this example, the contour grinding unit 3 includes a support assembly 30, a pressing assembly 31, and a contour grinding head 32. The support assembly 30 includes multiple support wheel sets z spaced apart along the length of the slender tube G. Each support wheel set z includes two support wheels 300 whose axis is parallel to the axis of the slender tube G. The two support wheels 300 are side by side and roll to support the slender tube G. The pressing assembly 31 includes multiple pressing wheels 310 that correspond one-to-one with the support wheel sets z and can be switched to press down on the support wheel sets z. The rotational cooperation between the support wheels 300 and the pressing wheels 310 drives the slender tube G to rotate around itself. The centerline rotates, and based on the position switching of the pressure roller 310, a grinding section G1 and a positioning section G2 are formed on the slender tube G. There are two contour grinding heads 32, and their rotation direction is opposite to that of the slender tube G. The grinding strokes formed by the two contour grinding heads 32 extend from both ends of the slender tube G to the middle and coincide in the middle of the slender tube G. The grinding strokes formed by the two contour grinding heads 32 are less than the length of the grinding section G1. The two contour grinding heads 32 grind one after the other. At the same time, one contour grinding head 32 forms the end of the positioning section G2, which is restricted, while the other contour grinding head 32 grinds along the grinding stroke.

[0043] In some specific embodiments, there are two support roller sets z and two pressure rollers 310, and in the orthographic projection on the horizontal plane, the two pressure rollers 310 are located between the two support roller sets z. Here, the short distance between adjacent pressure rollers facilitates the formation of the optimal grinding stroke when switching the positions of the pressure rollers one after another, and the staggered layout of the upper and lower support rollers and pressure rollers improves the stability of the rotation of the slender tube during grinding.

[0044] For ease of implementation, any support wheel group z also includes a drive component 301 connected to the corresponding support wheel 300. Adjacent support wheel groups z are synchronously driven by a synchronous shaft. The drive component 301 drives the support wheel 300 to rotate around its own center line through a transmission belt. Based on the pressing wheel 310 pressing down on the slender tube G, each support wheel 300 and the corresponding pressing wheel 310 rotate in the same direction to drive the slender tube G to rotate. The pressing assembly 31 also includes multiple power components 311 corresponding to each pressing wheel 310. Each power component 311 includes a transverse seat 3110 that reciprocates horizontally along the direction perpendicular to the length of the slender tube G, and a lifting seat 3111 that is movably connected to the transverse seat 3110. The pressing wheel 310 is mounted on the corresponding lifting seat 3111 and presses down or detaches from the slender tube based on the horizontal transverse and lifting motion.

[0045] In some specific embodiments, during contour grinding, the center of the overlapping portion of the section G1 to be ground, formed by the sequential switching of the position of the pressure roller 310, the support center formed by the multiple support roller sets z, and the center of the slender tube G are aligned. Here, the grinding of the central contour is carried out under stable support in the middle of the slender tube, reducing the probability of deformation.

[0046] Meanwhile, the length of the slender tube G is L, and the length of the section to be ground is L1, where 0.5L≤L1≤0.6L. Under this arrangement, when one contour grinding head is grinding, the end constraint effect of the positioning section formed by the other contour grinding head is optimal.

[0047] It should be noted that the contour grinding head 32 in this embodiment is a conventional tube contour grinding head, driven by conventional lateral and lifting cylinders to contact or disengage from the contour surface of the slender tube and move along the length of the slender tube. When restricting the end of the positioning segment G2, the corresponding contour grinding head 32 can contact the circumferential end of the positioning segment G2 and use the friction between the rough surface of the grinding head and the slender tube G to form axial restriction, or it can directly contact the end face of the positioning segment G2 to form axial restriction. In this embodiment, during sequential grinding, the corresponding contour grinding head 32 contacts the circumferential end of the positioning segment G2 to form axial restriction. In this way, the other contour grinding head 32 can perform grinding in the forward or reverse direction along the axial direction of the slender tube G, which simplifies the movement path of the grinding head and improves efficiency.

[0048] In this example, the end face grinding unit 4 and the inner hole grinding unit 5 each include a support mechanism a, a pressing mechanism b, and a grinding mechanism c. The structure of the support mechanism a is the same as that of the support assembly 30. The pressing mechanism b includes two pressure rollers b0 that press down on or disengage from the slender tube simultaneously above the support mechanism a. The pressing positions formed by the two pressure rollers b0 are aligned vertically with the supporting positions formed by the support rollers in the support mechanism a. It should be explained that because the pressing positions of the pressure rollers do not interfere with the grinding of the end face and the inner hole, this arrangement provides the best clamping effect for the slender tube, avoids displacement during grinding, and reduces deformation of the slender tube.

[0049] To further facilitate implementation, the grinding mechanism c of the end face grinding unit 4 includes two end face grinding heads c0 correspondingly disposed at both ends of the slender tube G. The two end face grinding heads c0 rotate in the opposite direction to the slender tube G, and are synchronously displaced towards each other to grind or detach from the end faces of the slender tube. Here, bidirectional synchronous grinding or detachment of the end faces of the slender tube enables further correction of the axial position of the slender tube, facilitating the next step of precise internal hole grinding.

[0050] Meanwhile, the grinding mechanism c of the inner hole grinding unit 5 includes two inner hole grinding heads c1 correspondingly disposed at both ends of the slender tube G and matching the inner hole of the slender tube G. The rotation direction of the two inner hole grinding heads c1 is opposite to that of the slender tube G. The grinding stroke formed by the two inner hole grinding heads c1 extends from both ends of the inner hole of the slender tube towards the middle. The two inner hole grinding heads c1 maintain an end gap and reciprocate along the length direction of the slender tube G to form a grinding zone covering the inner hole wall of the slender tube. Here, because the diameter of the slender tube is small (for example, the diameter of the oil pipe of an automotive gearbox does not exceed 10 mm) and the tube body is long, any slight vibration caused by external force can easily cause deformation or shaking of the tube body. Therefore, by adopting the bidirectional grinding stroke layout of the two inner hole grinding heads of this application, the inner hole wall can be fully covered by grinding with the end gap of the two grinding heads while reducing the tube body offset, and no damage to the inner hole wall of the slender tube is caused.

[0051] In some specific embodiments, each internal grinding head c1 forms a grinding body circumferentially (not shown in the figure, but it is easy to imagine), the grinding body extending spirally around the centerline of the internal grinding head (or slender tube), and the two grinding bodies rotate in opposite directions. This facilitates the removal of grinding debris, and at the same time, the opposing rotation directions create mutually canceling axial forces, reducing tube body offset.

[0052] To further improve the grinding effect, the support mechanism a, the pressing mechanism b, and the grinding mechanism c of the inner hole grinding unit 5 constitute an inner hole grinding group. There are at least two inner hole grinding groups, and the grinding accuracy increases progressively. Specifically, the diameter of the grinding brush filaments on the grinding head gradually decreases. Here, a progressive precision grinding method is adopted to reduce damage to the inner hole wall.

[0053] Meanwhile, the inner hole grinding unit 5 also includes a dust blowing unit d connected to the next stage inner hole grinding group. The dust blowing unit d adopts the same support and pressing structure to clamp the slender tube, and a dust blowing pipe is set at one end of the slender tube and a dust collecting pipe is set at the other end to form an airflow along the axial direction of the slender tube, thereby removing burrs and debris from the contour surface and inner hole of the slender tube.

[0054] In this example, the dust collection unit 6 includes dust collection pipes 60 correspondingly located below the contour grinding unit 3, the end face grinding unit 4, and the inner hole grinding unit 5. The dust collection ports of the dust collection pipes 60 are V-shaped with their openings facing upwards. During grinding, both ends of the slender pipes in each grinding station extend into the corresponding dust collection ports. This collects the flying dust generated during grinding, preventing pollution of the workshop environment.

[0055] To further facilitate implementation, the vacuuming unit 6 also includes a vacuuming hood cavity 61. The vacuuming hood cavity 61 is provided with multiple V-shaped grooves arranged side by side and corresponding to the middle section of the slender tube in each grinding station. A notch is formed on the groove wall of each V-shaped groove. The aforementioned support component 30, pressing component 31, support mechanism a, and pressing mechanism b are all installed in the vacuuming hood cavity 61. Each support wheel, pressing wheel, and pressing wheel extends out from the corresponding notch to cooperate with the slender tube.

[0056] In this example, the transfer unit 7 is positioned above each grinding station. The transfer unit 7 includes multiple grippers 70 corresponding to the support base 210 and each grinding station, used for picking up and placing the slender tubes G, and a transfer drive unit 71 that drives the grippers 70 to move between the grinding stations. During transfer, the multiple grippers 70 move synchronously with a distance equal to the distance between adjacent grinding stations, and the slender tubes G at each grinding station are synchronously transferred to the adjacent grinding station. Here, multiple slender tubes can be simultaneously and sequentially aligned and subjected to each grinding process.

[0057] In addition, the receiving unit 8 is connected to the dust blowing unit d of the inner hole grinding unit 5, including the receiving trough 80 and the unloading robot 81 used to transfer the slender tubes that have completed inner hole grinding to the receiving trough 80 one by one. These are conventional technical means, which will not be described in detail here, and are also clearly feasible.

[0058] In summary, using this grinding machine, the contour grinding unit, end face grinding unit, and inner hole grinding unit sequentially grind the contour, end face, and inner hole of the slender tube. During contour grinding, the slender tube is first placed on multiple support roller sets, with two support rollers in each set providing rolling support. Multiple pressure rollers press down on top of the support roller sets, and the rotation of the support rollers and pressure rollers in tandem drives the slender tube to rotate around its centerline. Then, by switching the position of the pressure rollers, a section to be ground and a positioning section are formed on the slender tube. A... One contour grinding head restricts the end of the first positioning section, while another contour grinding head grinds the first section to be ground along the grinding stroke. Then, the position of the pressure roller is switched to form the second section to be ground and the positioning section on the slender tube. The first contour grinding head restricts the end of the second positioning section, while another contour grinding head grinds the second section to be ground along the grinding stroke. The grinding strokes formed by the first and second grindings extend from both ends of the slender tube to the middle and coincide in the middle of the slender tube. The first and second grinding strokes are both less than the length of the first and second sections to be ground. Therefore, compared with the prior art, this invention has several advantages. First, based on the position switching of the pressure rollers, two contour grinding heads grind the slender tube sequentially, effectively eliminating grinding dead angles. This allows the slender tube to be contour-ground and shaped in a single clamping operation, simplifying operation and increasing grinding efficiency. Second, based on the cooperation of the two contour grinding heads, positioning constraints can be simultaneously formed along the axial direction of the slender tube during grinding, effectively reducing axial offset caused by contour grinding, achieving full-coverage grinding, and ensuring the positional accuracy of the slender tube after contour grinding. This facilitates subsequent precise grinding of the end face and inner hole of the slender tube, thereby improving the all-round burr removal rate of the slender tube. Third, the short distance between adjacent pressure rollers facilitates the formation of the optimal grinding stroke when switching the positions of the pressure rollers sequentially, and based on the above... The staggered arrangement of the lower support roller and the lower pressure roller improves the stability of the slender tube's rotation during grinding. Fourthly, the bidirectional grinding stroke layout of the two internal grinding heads in this application reduces tube body offset and achieves full coverage grinding of the inner hole wall through the spacing between the ends of the two grinding heads, without damaging the inner hole wall of the slender tube. Fifthly, it facilitates the removal of grinding debris, and the mutually canceling axial forces formed by the grinding bodies with opposite rotation directions reduce tube body offset. Sixthly, the use of bidirectional synchronous grinding or detachment from the end face of the slender tube enables further correction of the axial position of the slender tube, facilitating the next step of precise internal hole grinding. Seventhly, it can effectively collect the flying dust generated during all-round grinding, avoiding pollution to the workshop environment.

[0059] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. A universal polisher for elongated tubes, comprising a frame, a profile polishing unit, an end face polishing unit and an inner bore polishing unit, characterized in that, The profile polishing unit comprises a supporting assembly, a pressing assembly, and profile polishing heads. The supporting assembly comprises a plurality of supporting wheel sets arranged along the length direction of the elongated tube. Each supporting wheel set comprises two supporting wheels with their axis parallel to the axis of the elongated tube. The two supporting wheels are arranged side by side and roll to support the elongated tube. The pressing assembly comprises a plurality of pressing wheels corresponding to the supporting wheel sets. Each pressing wheel is arranged above a corresponding supporting wheel set and can be switched between pressing and releasing the elongated tube. The rotation of the supporting wheels and the pressing wheels cooperates to drive the elongated tube to rotate around its center line. The position of the pressing wheels determines the polishing section and the positioning section on the elongated tube. The profile polishing heads are arranged in opposite directions to the elongated tube. The polishing paths formed by the two profile polishing heads extend from both ends to the middle of the elongated tube and overlap in the middle. The length of the polishing paths is less than the length of the polishing section. The two profile polishing heads polish the elongated tube in sequence. One profile polishing head forms the end limit of the positioning section, and the other profile polishing head polishes along the polishing path. The profile polishing unit, the end face polishing unit, and the inner hole polishing unit form the profile polishing station, the end face polishing station, and the inner hole polishing station. The polishing machine further comprises a transfer unit arranged above each station.

2. The all-around sander for an elongated pipe according to claim 1, characterized in that, The center of the overlapping part of the polishing section, the supporting center of the supporting wheel sets, and the center of the elongated tube are aligned. The length of the elongated tube is L, and the length of the polishing section is L1, where 0.5L≤L1≤0.6L.

3. The all-around sander for an elongated pipe according to claim 1, characterized in that, The supporting wheel sets and the pressing wheels each have two, and in the horizontal projection, the two pressing wheels are located between the two supporting wheel sets.

4. The all-around sander for an elongated pipe according to claim 1 or 3, characterized in that, The pressing assembly further comprises a plurality of power units corresponding to the pressing wheels. Each power unit comprises a horizontal displacement seat that horizontally reciprocates along a direction perpendicular to the length direction of the elongated tube, and a lifting seat that is movably connected to the horizontal displacement seat. The pressing wheel is installed on the corresponding lifting seat and cooperates with the horizontal displacement and lifting motion to press or release the elongated tube.

5. The all-around sander for elongated pipes according to claim 1, characterized in that, Each supporting wheel set further comprises a driving unit connected to the corresponding supporting wheel. The driving unit drives the supporting wheel to rotate around its center line. When the pressing wheel presses the elongated tube, the supporting wheel and the corresponding pressing wheel rotate in the same direction to drive the elongated tube to rotate.

6. The all-around sander for elongated pipes according to claim 1, characterized in that, The end face polishing unit and the inner hole polishing unit each comprise a supporting mechanism, a pressing mechanism, and a polishing mechanism. The structure of the supporting mechanism is the same as that of the supporting assembly. The pressing mechanism comprises a plurality of pressing wheels that press above the supporting mechanism and synchronously press or release the elongated tube. The pressing positions formed by the pressing wheels are aligned with the supporting positions formed by the supporting mechanism.

7. The all-around sander for elongated pipes according to claim 6, characterized in that, The polishing mechanism of the inner hole polishing unit comprises two inner hole polishing heads arranged at the two ends of the elongated tube and matched with the inner hole of the elongated tube, wherein the rotation directions of the two inner hole polishing heads are opposite to the rotation direction of the elongated tube, the grinding stroke of the two inner hole polishing heads respectively extends from the two ends to the middle of the inner hole of the elongated tube, and the two inner hole polishing heads are kept spaced at the ends and reciprocate along the length direction of the elongated tube to form a grinding area covering the inner hole wall of the elongated tube.

8. The all-around sander for elongated pipes according to claim 7, characterized in that, The circumferential direction of each inner hole polishing head forms a grinding body, which spirally extends around the center line of the inner hole polishing head, and the rotation directions of the two grinding bodies are opposite.

9. The all-around sander for elongated tubes according to claim 6 or 7 or 8, characterized in that, The supporting mechanism, the pressing mechanism and the polishing mechanism of the inner hole polishing unit form an inner hole polishing group, the inner hole polishing group has at least two groups and the grinding accuracy gradually increases; and / or the polishing mechanism of the end face polishing unit comprises two end face polishing heads arranged at the two ends of the elongated tube, wherein the rotation directions of the two end face polishing heads are opposite to the rotation direction of the elongated tube, and the two end face polishing heads are synchronously displaced towards each other to polish or separate from the end faces of the two ends of the elongated tube.

10. The all-around sander for elongated pipes according to claim 1, characterized in that, The profile polishing unit, the end face polishing unit and the inner hole polishing unit are arranged side by side on the rack; the polishing machine further comprises a transfer unit arranged above each station, the transfer unit comprises a plurality of clamping jaws corresponding to each station and used for taking and placing the elongated tube, a transfer driving member for driving the clamping jaws to displace between the stations, when transferring, the plurality of clamping jaws synchronously move and the moving distance is equal to the distance between adjacent stations, and the elongated tubes in each station are synchronously transferred to the adjacent station; and / or the polishing machine further comprises a dust collection unit, the dust collection unit comprises a dust collection pipeline arranged below the profile polishing unit, the end face polishing unit and the inner hole polishing unit, wherein the dust suction port of the dust collection pipeline is in a V shape with the opening upward, and when grinding, each elongated tube extends into the corresponding dust suction port.

11. The all-around sander for elongated pipes according to claim 1, characterized in that, The polishing machine further comprises a feeding unit connected with the profile polishing unit and a receiving unit connected with the inner hole polishing unit, wherein the feeding unit comprises a feeding groove, a centering component for the pair of elongated tubes and an upper feeding manipulator for transferring the elongated tubes from the feeding groove to the centering component one by one; the receiving unit comprises a receiving groove and a lower feeding manipulator for transferring the elongated tubes with the polished inner hole to the receiving groove one by one.

12. The all-around sander for elongated pipes according to claim 11, characterized in that, The centering component comprises a bearing seat formed with a plurality of V-shaped grooves spaced along the length direction of the elongated tube, and centering modules arranged at the opposite sides of the bearing seat, the elongated tube is transferred from the feeding groove to the V-shaped groove, and the two centering modules move towards each other along the length direction of the elongated tube and push the two ends of the elongated tube to be centered.

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