Synchronous cooling and grinding device for the inner hole of tubular castings

Abstract

This utility model relates to the field of machining equipment technology, specifically a synchronous cooling and grinding device for the inner hole of a tubular casting. It includes a single-axis feed mechanism clamping mechanism, a tubular casting, a grinding assembly, a fixed bracket, a drive assembly, a dual-flow rotary joint, a connecting flange, and a coupling. The single-axis feed mechanism includes a lead screw and a moving platform. The clamping mechanism on the moving platform is equipped with a double-jaw pneumatic clamp and a hydraulic lifting rod with a displacement sensor. The rotating central shaft of the grinding assembly is equipped with a flow-dividing platform, a hydraulic channel, and a coolant channel. Its outer circumference has 120° distributed mounting slots and hydraulic devices. The hydraulic devices drive three grinding units spaced 120° apart and equipped with springs. The dual-flow rotary joint enables synchronous fluid transmission, allowing for simultaneous cooling of the grinding area during grinding, preventing thermal deformation, and improving machining accuracy and efficiency. The springs in the grinding units provide radial elastic extension and contraction capabilities for the grinding head, enabling full-circumference grinding of the inner hole without dead angles. It is suitable for various specifications of tubular castings.

Description

Technical Field

[0001] This utility model relates to the field of machining equipment technology, and in particular to a device for synchronous cooling and grinding of the inner hole of tubular castings. Background Technology

[0002] Tubular castings are products made by injecting molten metal or alloy into a pre-set tubular mold, cooling and solidifying it. They have a hollow tubular or cylindrical structure and their core functions are to realize fluid transportation, pressure bearing or to serve as core support components of equipment. Tubular castings are widely used in the automotive, aerospace, hydraulic and other fields. The roundness, roughness and coaxiality of their inner holes directly determine the assembly performance and service life of the product.

[0003] Traditional internal hole grinding often employs a separate process of grinding first and then cooling. However, during the grinding process, frictional heat can easily cause thermal deformation of the inner hole of the casting, resulting in the final accuracy exceeding the design requirements. The additional cooling process also increases the production cycle, and the cooling medium cannot be accurately applied to the grinding area, resulting in poor cooling effect. Tubular castings may have diameter deviations or uneven inner walls. However, existing grinding heads are mostly rigid structures and cannot adaptively adjust radial pressure, which can easily lead to hard contact that damages the grinding head or the casting. The grinding consistency of irregular areas on the inner wall is poor, requiring multiple reworks. Utility Model Content

[0004] To address the issues of low precision and inability of the grinding head to self-adapt in synchronous cooling and grinding devices for the inner holes of tubular castings, this invention provides a synchronous cooling and grinding device for the inner holes of tubular castings. The technical solution adopted by this invention to solve the above problems is as follows: A synchronous cooling and grinding device for the inner holes of tubular castings includes a single-axis feed mechanism, a clamping mechanism, a tubular casting, a grinding assembly, a fixed bracket, a drive assembly, a dual-flow rotary joint, a connecting flange, and a coupling. The single-axis feed mechanism includes a lead screw and a moving platform. A clamping mechanism is provided on the moving platform. The clamping mechanism includes a pneumatic clamp, a pneumatic opening and closing cylinder, and a hydraulic lifting rod. The pneumatic clamp is in contact with the outer circumference of the tubular casting. The drive assembly includes a first drive motor and a second drive motor. The first drive motor is connected to the lead screw, and a fixed bracket is provided between the first drive motor and the single-axis feed mechanism. The grinding assembly includes a fixed outer sleeve, a rotating central shaft, and a grinding unit. The fixed outer sleeve is connected to a fixed bracket. One end of the coupling is connected to a second drive motor, and the other end is connected to a connecting flange. The connecting flange is fixedly connected to one end of a dual-flow rotary joint, and the other end of the dual-flow rotary joint is interference-fitted to the non-grinding end of the rotating central shaft. The rotating central shaft includes a distribution platform, a mounting slot hydraulic device, a hydraulic channel, and a coolant channel. Multiple mounting slots and hydraulic devices are provided and are distributed at 120° intervals along the outer circumference of the rotating central shaft. The hydraulic device includes a hydraulic cylinder and a hydraulic push rod. The hydraulic push rod is connected to the grinding unit. The inlet ends of the hydraulic channel and the coolant channel are connected to the distribution platform, wherein the outlet end of the coolant channel is inclined at 15° to 20° along the circumference of the rotating central shaft.

[0005] In the aforementioned synchronous cooling and grinding device for the inner hole of the tubular casting, the fixed outer sleeve has two radially symmetrical input holes near the connection point with the fixed support. These holes are for hydraulic oil and coolant, respectively. The central axis of the input holes coincides with the radial direction of the fixed outer sleeve, and the central axes of the two input holes are offset by 180° in the circumference of the fixed outer sleeve. The two input pipelines are connected to two interfaces in the dual-flow rotary joint through the two input holes. The central axis of the input holes coincides with the radial direction of the fixed outer sleeve, which clarifies the opening direction of the holes and avoids deviation in the pipeline connection angle caused by oblique opening. This ensures the perpendicular connection between the external pipeline and the fixed outer sleeve. The 180° offset of the two input holes in the circumference of the fixed outer sleeve ensures balanced force on the fixed outer sleeve.

[0006] The aforementioned synchronous cooling and grinding device for the inner hole of tubular castings includes a flow-dividing platform on the rotating central shaft comprising a hydraulic oil chamber and a coolant chamber that are isolated from each other. The hydraulic oil chamber is connected to the inlet end of the hydraulic channel through a radial oil hole, and the coolant chamber is connected to the inlet end of the coolant channel through a radial water hole. Furthermore, the axes of the radial oil hole and the radial water hole are offset by 30° in the circumferential direction. The hydraulic oil chamber and the coolant chamber are isolated from each other, achieving physical separation of hydraulic oil and coolant from the source. This ensures that the hydraulic drive and synchronous cooling functions do not interfere with each other. The 30° circumferential offset hole design avoids the overlap of the two holes in the radial direction of the rotating central shaft and makes the fluid turn from the chamber to the channel more gently through the small angle offset, reducing local turbulence and pressure loss, and ensuring the stability of the grinding head feed.

[0007] The aforementioned synchronous cooling and grinding device for the inner hole of tubular castings includes a rear end connection of the grinding unit to the end of the hydraulic push rod in the hydraulic device. The bottom of the hydraulic cylinder is interference-fitted into the mounting groove. The movement of the hydraulic push rod is radial along the rotating central axis. The interference fit between the bottom of the hydraulic cylinder and the mounting groove forms a tight mechanical lock. When the rotating central axis rotates at high speed, it can counteract the radial load generated by centrifugal force, preventing the hydraulic cylinder from axial movement or circumferential deflection due to vibration and impact, ensuring the positioning accuracy of the grinding unit. The radial movement trajectory limits the driving force of the hydraulic push rod to be transmitted entirely along the inner hole radius direction, avoiding uneven wear of the grinding unit caused by oblique force. At the same time, with the cooperation of multiple sets of hydraulic devices distributed 120° circumferentially, uniform grinding in the circumferential direction of the inner hole can be achieved, significantly improving the roundness of the inner hole.

[0008] The aforementioned synchronous cooling and grinding device for the inner hole of a tubular casting includes a grinding unit comprising an arc-shaped grinding head, a connecting base, and a spring. Three grinding units are arranged at 120° intervals along the grinding end of the rotating shaft. Each grinding head is mounted on the connecting base. One end of each spring is connected to the inner arc boss of the arc-shaped grinding head, and the other end is connected to a spring seat on the connecting base. The connecting base has a groove that connects to a limiting shaft of the arc-shaped grinding head. The three 120° intervals ensure that the grinding force is evenly distributed along the circumference of the inner hole. With the rotation of the central axis, the inner hole can be ground without dead angles around the entire circumference. The spring gives the grinding head radial elastic extension and contraction capability, which can adapt to the casting error, local unevenness or ovality of the inner hole of the tubular casting. It avoids jamming, workpiece damage or incomplete grinding caused by rigid grinding. The sliding groove of the connecting base and the limiting shaft of the grinding head form a precise guide, which restricts the grinding head to move only radially along the central axis of rotation. It avoids the circumferential wobble of the grinding head caused by the centrifugal force of rotation or uneven spring force, ensures the stability of the grinding trajectory and improves the surface roughness of the inner hole.

[0009] The aforementioned synchronous cooling and grinding device for the inner hole of tubular castings features a pneumatic clamping mechanism with a double-jaw symmetrical structure. The clamping surface of the pneumatic clamp is provided with a grid-like anti-slip texture, and the clamping body is made of high-strength aluminum alloy and has undergone hard anodizing treatment. The double-jaw symmetrical structure ensures that the clamping force is symmetrically distributed radially along the tubular casting, which can accurately position the coincidence of the workpiece axis and the rotation axis, avoiding workpiece sway caused by unilateral force, reducing radial runout during inner hole grinding from the source, and significantly improving the roundness of the machining. The grid-like anti-slip texture can increase the friction between the clamping surface and the outer circle of the tubular casting, especially for smooth aluminum alloy and copper alloy castings, effectively preventing workpiece movement during high-speed rotation or axial feeding.

[0010] The aforementioned synchronous cooling and grinding device for the inner hole of tubular castings features a hollow piston rod hydraulic lifting rod with an internal displacement sensor. This sensor detects the extension and retraction of the lifting rod in real time to control the height positioning accuracy of the clamping mechanism. The built-in displacement sensor, in conjunction with the control system, can control the height positioning error of the clamping mechanism to within ±0.02mm, ensuring that the axis of the inner hole of the tubular casting coincides with the axis of rotation. The real-time detection by the displacement sensor allows the lifting rod to be precisely adjusted according to the diameter of the tubular casting without changing the clamping fixture. This solves the problem of manually replacing pads or recalibrating in traditional devices, adapting to the needs of multi-variety, small-batch production and reducing changeover time by more than 60%.

[0011] As described above, the beneficial effects of the synchronous cooling and grinding device for the inner hole of tubular castings provided by this utility model are as follows: In this utility model, the cooling medium is directly and directionally transported to the contact area between the grinding unit and the inner hole through the 120° circumferentially distributed coolant channels on the inner shaft of the rotating shaft. The grinding position is cooled by the swirling flow, and the cooling efficiency is more than 60% higher than that of the traditional external spraying. Cooling can be achieved simultaneously during the inner hole grinding process, avoiding the deviation of the inner hole size caused by thermal deformation of the tubular casting. The three grinding units evenly distributed at 120° can elastically expand and contract in the radial direction, which can not only adapt to tubular castings with different hole diameters, but also fit the local unevenness of the inner hole, achieving full circumference grinding without dead angles. The buffering effect of the spring avoids the workpiece outer circle crushing and grinding head breakage caused by rigid grinding, especially protecting the structural integrity of thin-walled castings and improving the workpiece qualification rate. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the present invention; Figure 2 This is a schematic diagram from another perspective of the present invention; Figure 3 This is an exploded view of the present invention; Figure 4 This is a partial sectional view of the present invention; Figure 5 for Figure 4 A magnified view of part I; Figure 6 for Figure 4 A magnified view of part II.

[0014] Summary of figure labels and their descriptions: 1. Single-axis feed mechanism; 11. Lead screw; 12. Moving platform; 2. Clamping mechanism; 21. Pneumatic clamp; 22. Pneumatic opening and closing cylinder; 23. Hydraulic lifting rod; 3. Tubular casting; 4. Grinding assembly; 41. Fixed outer sleeve; 411. Hydraulic oil inlet; 412. Coolant inlet; 42. Rotating central shaft; 421. Diverting platform; 422. Mounting slot; 423. Hydraulic device; 4231. Hydraulic cylinder; 4232. Hydraulic push rod; 424. Hydraulic channel; 425. Coolant channel; 43. Grinding unit; 431. Arc-shaped grinding head; 432. Connecting base; 433. Spring; 5. Fixed bracket; 6. Drive assembly; 61. First drive motor; 62. Second drive motor; 7. Dual-flow rotary joint; 8. Connecting flange; 9. Coupling. Detailed Implementation

[0015] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0016] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0018] Please refer to Figure 1 and Figure 3A synchronous cooling and grinding device for the inner hole of a tubular casting includes a single-axis feed mechanism 1, a clamping mechanism 2, a tubular casting 3, a grinding assembly 4, a fixed bracket 5, a drive assembly 6, a dual-flow rotary joint 7, a connecting flange 8, and a coupling 9. The single-axis feed mechanism 1 includes a lead screw 11 and a moving platform 12. The clamping mechanism 2 is provided on the moving platform 12. The clamping mechanism 2 includes a pneumatic clamp 21, a pneumatic opening and closing cylinder 22, and a hydraulic lifting rod 23. The pneumatic clamp 21 fits against the outer circumference of the tubular casting 3. The drive assembly 6 includes a first drive motor 61 and a second drive motor 62. The first drive motor 61 is connected to the lead screw 11. A fixed bracket 5 is provided between the first drive motor 61 and the single-axis feed mechanism 1. Grinding assembly 4 includes a fixed outer sleeve 41, a rotating central shaft 42, and a grinding unit 43. The fixed outer sleeve 41 is connected to a fixed bracket 5. One end of the coupling 9 is connected to a second drive motor, and the other end is connected to a connecting flange 8. The connecting flange 8 is fixedly connected to one end of a dual-flow rotary joint 7, and the other end of the dual-flow rotary joint 7 is interference-fitted to the non-grinding end of the rotating central shaft 42. The rotating central shaft 42 includes a flow distribution platform 421, a mounting groove 422, a hydraulic device 423, a hydraulic channel 424, and a cooling system. Multiple cooling channels 425, mounting slots 422, and hydraulic devices 423 are provided and are distributed at 120° intervals along the outer circumference of the rotating central axis 42. The hydraulic device 423 includes a hydraulic cylinder 4231 and a hydraulic push rod 4232. The hydraulic push rod 4232 is connected to the grinding unit 43. The inlet ends of the hydraulic channel 424 and the coolant channel 425 are connected to the diversion platform 421. The outlet end of the coolant channel 425 is inclined at 15° to 20° along the circumference of the rotating central axis 42.

[0019] Please refer to Figure 1 and Figure 2 The fixed outer sleeve 41, near the connection point with the fixed bracket 5, has two radially symmetrical input holes, namely a hydraulic oil input hole 411 and a coolant input hole 412. The central axis of the input holes coincides with the radial direction of the fixed outer sleeve 41. The central axes of the two input holes are offset by 180° in the circumference of the fixed outer sleeve 41. The two input pipelines are connected to the two interfaces in the double-flow rotary joint 7 through the two input holes respectively. The central axis of the input holes coincides with the radial direction of the fixed outer sleeve 41, which clarifies the opening direction of the holes and avoids the deviation of the pipeline connection angle caused by the oblique opening. It ensures the vertical connection between the external pipeline and the fixed outer sleeve 41. The 180° offset of the two input holes in the circumference of the fixed outer sleeve 41 ensures that the fixed outer sleeve 41 is subjected to balanced force.

[0020] Please refer to Figure 6The flow-diverting platform 421 of the rotating central shaft 42 includes a hydraulic oil chamber and a coolant chamber that are isolated from each other. The hydraulic oil chamber is connected to the inlet end of the hydraulic channel 424 through a radial oil hole, and the coolant chamber is connected to the inlet end of the coolant channel 425 through a radial water hole. The axes of the radial oil hole and the radial water hole are offset by 30° in the circumferential direction. The hydraulic oil chamber and the coolant chamber are isolated from each other, realizing the physical separation of hydraulic oil and coolant from the source, ensuring that the hydraulic drive and synchronous cooling functions do not interfere with each other. The hole position design with an offset of 30° in the circumferential direction not only avoids the overlap of the two holes in the radial direction of the rotating central shaft 42, but also makes the direction of fluid turning from the chamber to the channel more gentle by the small angle offset, reducing local turbulence and pressure loss, and ensuring the stability of the feed of the arc-shaped grinding head 431.

[0021] Please refer to Figure 3 and Figure 5 The end of the hydraulic push rod 4232 in the hydraulic device 423 is connected to the rear end of the grinding unit 43. The bottom of the hydraulic cylinder 4231 is interference-fitted into the mounting groove 422. The movement of the hydraulic push rod 4232 is radial along the rotating central axis 42. The interference fit between the bottom of the hydraulic cylinder 4231 and the mounting groove 422 can form a tight mechanical lock. When the rotating central axis 42 rotates at high speed, it can counteract the radial load generated by centrifugal force, and prevent the hydraulic cylinder 4231 from axial movement or circumferential deflection due to vibration and impact, thus ensuring the positioning accuracy of the grinding unit 43. The radial movement trajectory limits the driving force of the hydraulic push rod 4232 to be transmitted entirely along the inner hole radius direction, avoiding uneven wear of the grinding unit 43 caused by oblique force. At the same time, with the cooperation of multiple sets of hydraulic devices 423 distributed 120° circumferentially, uniform grinding in the circumferential direction of the inner hole can be achieved, significantly improving the roundness of the inner hole.

[0022] Please refer to Figure 5The grinding unit 43 includes an arc-shaped grinding head 431, a connecting base 432, and a spring 433. Three grinding units 43 are arranged at 120° intervals along the grinding end of the rotating shaft 42. The arc-shaped grinding head 431 is mounted on the connecting base 432. One end of the spring 433 is connected to the inner arc boss of the arc-shaped grinding head 431, and the other end is connected to the spring seat of the connecting base 432. The connecting base 432 has a sliding groove that connects to a limiting shaft on the arc-shaped grinding head 431. The three grinding units 43 are distributed at 120° intervals, ensuring that the grinding force is evenly distributed along the circumference of the inner hole, cooperating with the rotation of the rotating shaft 42. The rotating head 431 can achieve full-circumference grinding of the inner hole without dead angles. The spring 433 enables the arc-shaped grinding head 431 to have radial elastic extension and contraction capabilities, which can adapt to the casting error, local unevenness or ovality of the inner hole of the tubular casting 3, and avoid jamming, workpiece damage or incomplete grinding caused by rigid grinding. The sliding groove of the connecting base 432 cooperates with the limiting shaft of the arc-shaped grinding head 431 to form a precise guide, restricting the arc-shaped grinding head 431 to move only radially along the rotating central axis 42, avoiding circumferential sway of the arc-shaped grinding head 431 caused by the centrifugal force of the rotating central axis 42 or uneven elasticity of the spring 433, ensuring stable grinding trajectory and improving the surface roughness of the inner hole.

[0023] Please refer to Figure 1 and Figure 3 The pneumatic clamp 21 of the clamping mechanism 2 has a double-claw symmetrical structure. The clamping surface of the pneumatic clamp 21 is provided with a grid-like anti-slip texture, and the clamping body is made of high-strength aluminum alloy and has undergone hard anodizing treatment. The double-claw symmetrical structure makes the clamping force symmetrically distributed radially along the tubular casting 3, which can accurately position the coincidence of the workpiece axis and the axis of the rotating central axis 42, avoid workpiece swaying caused by unilateral force, reduce radial runout during inner hole grinding from the source, and significantly improve the roundness of the machining. The grid-like anti-slip texture can increase the friction between the clamping surface and the outer circle of the tubular casting 3, especially for smooth aluminum alloy and copper alloy castings, which can effectively prevent workpiece movement during high-speed rotation or axial feeding.

[0024] Please refer to Figure 5 and Figure 6 The hydraulic lifting rod 23 has a hollow piston rod structure and is equipped with a displacement sensor inside. It detects the extension and retraction of the hydraulic lifting rod 23 in real time to control the height positioning accuracy of the clamping mechanism 2. The built-in displacement sensor can detect the extension and retraction of the hydraulic lifting rod 23 in real time. Together with the control system, it can control the height positioning error of the clamping mechanism 2 within ±0.02mm, ensuring that the height of the inner hole axis of the tubular casting 3 coincides with the axis of the rotating central shaft 42. The real-time detection of the displacement sensor allows the hydraulic lifting rod 23 to accurately adjust its height according to the diameter of the tubular casting 3 without changing the clamping fixture. This solves the problem of manually replacing the pads or recalibrating in traditional devices, adapting to the needs of multi-variety, small-batch production, and reducing changeover time by more than 60%.

[0025] A specific application of this embodiment is as follows: A cast tubular part 3 is placed on the moving platform 12 of the single-axis feed mechanism 1. The clamping mechanism 2 is activated, at which point the pneumatic clamp 21 automatically closes, fitting the outer circumference of the tubular part 3. The hydraulic lifting rod 23 automatically adjusts its height according to the diameter of the tubular part 3, and the amount of extension / retraction is detected in real time and fed back to the control system. The coaxiality of the inner hole axis of the tubular part 3 with the axis of the rotating central shaft 42 is calibrated to ≤0.03mm. The second drive motor drives the rotating central shaft 42 to rotate through the coupling 9 and connecting flange 8. Three sets of 120° distributed... The grinding unit 43 rotates synchronously with the rotating central shaft 42. The hydraulic push rod 4232 pushes the arc-shaped grinding head 431 to extend radially under the oil supply of the hydraulic channel 424, and fits against the inner hole of the tubular casting 3. The first drive motor 61 drives the single-axis feed mechanism 1 to move the tubular casting 3 along the axial direction at a uniform speed to achieve grinding of the entire length of the inner hole. At the same time, coolant is sprayed out of the outlet of the coolant channel 425 to form a spiral vortex, which precisely covers the contact area between the grinding unit 43 and the inner hole of the tubular casting 3, removes frictional heat in real time, and carries the grinding debris generated by grinding out of the inner hole of the tubular casting 3 with the vortex.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A synchronous cooling and grinding device for the inner hole of a tubular casting, comprising a single-axis feed mechanism (1), a clamping mechanism (2), a tubular casting (3), a grinding assembly (4), a fixed bracket (5), a drive assembly (6), a dual-flow rotary joint (7), a connecting flange (8), and a coupling (9), characterized in that: The single-axis feed mechanism (1) includes a lead screw (11) and a moving platform (12). A clamping mechanism (2) is provided on the moving platform (12). The clamping mechanism (2) includes a pneumatic clamp (21), a pneumatic opening and closing cylinder (22), and a hydraulic lifting rod (23). The pneumatic clamp (21) is in contact with the outer circumference of the tubular casting (3). The drive assembly (6) includes a first drive motor (61) and a second drive motor (62). The first drive motor (61) is connected to the lead screw (11). A fixed bracket (5) is provided between the first drive motor (61) and the single-axis feed mechanism (1). The grinding assembly (4) includes a fixed outer sleeve (41), a rotating central shaft (42), and a grinding unit (43). The fixed outer sleeve (41) is connected to a fixed bracket (5). One end of the coupling (9) is connected to a second drive motor (62), and the other end is connected to a connecting flange (8). The connecting flange (8) is fixedly connected to one end of a double-flow rotary joint (7), and the other end of the double-flow rotary joint (7) is interference-fitted to the non-grinding end of the rotating central shaft (42). The rotating central shaft (42) includes a flow distribution platform (421), a mounting groove (422), a hydraulic device (423), and a hydraulic channel (424). The mounting groove (422) and the hydraulic device (423) are provided in multiple ways and are distributed at 120° intervals along the outer circumference of the rotating central axis (42). The hydraulic device (423) includes a hydraulic cylinder (4231) and a hydraulic push rod (4232). The hydraulic push rod (4232) is connected to the grinding unit (43). The inlet ends of the hydraulic channel (424) and the coolant channel (425) are connected to the diversion platform (421). The outlet end of the coolant channel (425) is inclined at 15° to 20° along the circumference of the rotating central axis (42).

2. The device for synchronous cooling and grinding of the inner hole of a tubular casting according to claim 1, characterized in that: The fixed outer sleeve (41) has two radially symmetrical input holes near the connection part of the fixed bracket (5), namely a hydraulic oil input hole (411) and a coolant input hole (412). The central axis of the input hole coincides with the radial direction of the fixed outer sleeve (41), and the central axes of the two input holes are offset by 180° in the circumference of the fixed outer sleeve (41). The two input pipes are connected to the two interfaces in the double flow rotary joint (7) through the two input holes respectively.

3. The device for synchronous cooling and grinding of the inner hole of a tubular casting according to claim 2, characterized in that: The diversion platform (421) of the rotating central shaft (42) includes a hydraulic oil chamber and a coolant chamber that are isolated from each other. The hydraulic oil chamber is connected to the inlet end of the hydraulic channel (424) through a radial oil hole, and the coolant chamber is connected to the inlet end of the coolant channel (425) through a radial water hole. The axes of the radial oil hole and the radial water hole are offset by 30° in the circumferential direction.

4. The device for synchronous cooling and grinding of the inner hole of a tubular casting according to claim 3, characterized in that: The hydraulic push rod (4232) in the hydraulic device (423) is connected to the rear end of the end grinding unit (43), and the bottom of the hydraulic cylinder (4231) is interference-fitted into the mounting groove (422), wherein the movement of the hydraulic push rod (4232) moves radially along the central axis of rotation (42).

5. The device for synchronous cooling and grinding of the inner hole of a tubular casting according to claim 4, characterized in that: The grinding unit (43) includes an arc-shaped grinding head (431), a connecting base (432), and a spring (433). There are three grinding units (43), which are distributed at 120° intervals in the grinding end of the rotating central shaft (42). The grinding head (431) is mounted on the connecting base (432). One end of the spring (433) is connected to the inner arc boss of the arc-shaped grinding head (431), and the other end is connected to the spring seat of the connecting base (432). The connecting base (432) is provided with a sliding groove, which is connected to the limiting shaft of the arc-shaped grinding head (431).

6. The device for synchronous cooling and grinding of the inner hole of a tubular casting according to claim 1, characterized in that: The pneumatic clamp (21) of the clamping mechanism (2) has a double-claw symmetrical structure. The clamping surface of the pneumatic clamp (21) is provided with a grid-like anti-slip texture, and the clamping body is made of high-strength aluminum alloy and is treated with hard anodizing.

7. The device for synchronous cooling and grinding of the inner hole of a tubular casting according to claim 6, characterized in that: The hydraulic lifting rod (23) is a hollow piston rod structure with a displacement sensor inside to detect the extension and retraction of the lifting rod in real time to control the height positioning accuracy of the clamping mechanism (2).

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