Valve guide centerless cylindrical grinder device

Abstract

This invention discloses a centerless cylindrical grinding machine device for valve guides, belonging to the field of valve guide grinding. The device is used for infeed grinding of valve guides and includes a machine table, an adjusting frame and a grinding head holder respectively disposed on both sides of the machine table, and a workpiece support frame disposed between the adjusting frame and the grinding head holder and fixedly mounted above the machine table. This invention achieves axial elastic limiting of the valve guide through a clamping assembly and a reversing assembly, and, in conjunction with radial support from the workpiece support frame, effectively suppresses grinding movement and wobble of slender workpieces, improving grinding stability, coaxiality, and dimensional accuracy. After processing, it can automatically switch to a clamping and transfer mode for automatic unloading, achieving a high degree of automation. Simultaneously, cutting fluid can be directionally introduced into the inner hole of the valve guide and overflowed from a high position, forming internal convection heat transfer and significantly improving the cooling effect. After grinding, by flipping the drain hole, residual fluid in the inner hole is quickly drained by gravity, further stabilizing machining accuracy.

Description

Technical Field

[0001] This invention relates to the field of valve guide grinding technology, and in particular to a centerless external cylindrical grinding machine apparatus for valve guides. Background Technology

[0002] The valve guide is a core component of the engine valve mechanism. It is a cylindrical, thick-walled, hollow sleeve with a through hole in the middle and open ends. It is mainly used to guide the valve stem to perform reciprocating linear motion and has a significant impact on the engine's sealing performance, intake efficiency, and service life.

[0003] Among them, valve guides used in heavy-duty diesel engines, model aircraft engines, small general-purpose gasoline engines and some two-stroke engines generally have the characteristics of large length-to-diameter ratio, weak rigidity and high material hardness (hardened material). They have high processing requirements for their outer roundness, cylindricity, coaxiality and surface roughness. At the same time, defects such as burns, deformation and chipping must be strictly controlled during processing.

[0004] Currently, the outer diameter machining of this type of valve guide is mostly carried out using centerless cylindrical grinding machines with a plunge grinding process. During machining, the workpiece is placed directly between the grinding wheel, guide wheel and support plate for grinding. Because these workpieces are slender and have high surface quality requirements, and production is mostly in small batches and multiple varieties, coupled with the extensive use of general-purpose machining equipment on site, factories mostly use manual unloading and storage after machining this type of valve guide. Due to the limitations of manual operation, the overall automation level of the process is low. Summary of the Invention

[0005] The purpose of this invention is to provide a centerless external cylindrical grinding machine for valve guides, which can solve the problem that in the prior art, valve guides that are slender and have high surface quality requirements are mostly cut and stored manually, which is limited by the operation method and has a low degree of automation in the overall process.

[0006] The technical problem to be solved by this invention can be achieved through the following technical solution: A centerless cylindrical grinding machine for valve guides is provided for infeed grinding of valve guides. It includes a machine table, an adjusting frame and a grinding head frame respectively disposed on both sides of the machine table, a workpiece support frame disposed between the adjusting frame and the grinding head frame and fixedly mounted above the machine table, and a conveying fixture disposed above the workpiece support frame for automatically unloading the valve guides. The conveying fixture includes an adjusting frame mounted in the middle of the machine table, a hydraulic cylinder disposed below the adjusting frame, a first moving part for adjusting the reciprocating movement of the hydraulic cylinder disposed at the top of the adjusting frame, a second moving part disposed at the extended end of the hydraulic cylinder, and two sets of clamping plates symmetrically disposed inside the second moving part. One set of clamping plates has a clamping assembly at the end near the valve guide, and another set of clamping plates has a reversing assembly at the end near the valve guide. The clamping assembly and the reversing assembly cooperate with each other to elastically limit the valve guide axially and to facilitate convective heat transfer within its inner bore.

[0007] Furthermore, the grinding head holder is provided with a grinding wheel for grinding valve guides, the adjusting frame is provided with an adjusting wheel for adjusting valve guides, and the width of the clamping plate is less than the shortest vertical distance from the outer surface of the grinding wheel to the outer surface of the adjusting wheel.

[0008] Furthermore, the adjusting frame is equipped with a water pump, the output end of the water pump is equipped with a delivery pipe, the output end of the delivery pipe is connected to a cooling plate for discharging coolant, and the output end of the cooling plate is positioned towards the valve guide.

[0009] Furthermore, the clamping assembly includes a clamping post fixedly connected to a clamping plate, a push plate slidably disposed inside the clamping post, a thrust spring disposed between one end of the push plate and the clamping post, a push rod fixedly connected to the other end of the push plate, the extended end of the push rod extending to the outside of the clamping post and fixedly connected to a baffle plate, and an inlet pipe extending into the valve guide is vertically disposed on the inner wall of the center of the baffle plate.

[0010] Furthermore, an elastic hose is vertically inserted into the top wall of the injection tube near the clamping column, and a receiving cover that is sealed and communicates with the elastic hose is fixed on the clamping plate.

[0011] Furthermore, the receiving port of the receiving cover is positioned directly opposite the output end of the cooling plate.

[0012] Furthermore, the reversing assembly includes a clamping post two fixedly connected to the bottom of another clamping plate. A push plate two is slidably provided on the inner wall of the clamping post two. A thrust spring two is provided between one end of the push plate two and the clamping plate. A push rod two is fixedly connected to the other end of the push plate two. The extended end of the push rod two extends to the outside of the clamping post two and is fixedly connected to a stop plate two. A guide post extending into the valve guide is provided on the side wall of the stop plate two.

[0013] Furthermore, the top of the second baffle plate is provided with a drain hole that communicates with the inside of the valve guide.

[0014] Furthermore, a gear sleeve is fitted on the outer wall of the push rod two and fixedly connected to the stop plate two. A drive gear is meshed on the outer wall of the gear sleeve. A connecting shaft is fixedly provided at the center of the drive gear. A servo motor for driving the connecting shaft to rotate is fixedly provided on the clamping column two.

[0015] Furthermore, ball grooves are provided on the side walls of the first and second baffles opposite to the valve guide end face, and ball grooves are embedded with freely rolling balls.

[0016] The beneficial effects of this invention are: 1. This invention forms an axial elastic limit by clamping components and reversing components, and works in conjunction with the radial support of the workpiece support frame to effectively suppress the slender valve guide's movement and wobble during grinding, significantly improving grinding stability, coaxiality and dimensional accuracy. After grinding, the device can automatically switch the clamping state from the limiting mode to the reliable clamping mode, and automatically unload the valve guide by moving the workpiece to the unloading conveyor through lifting and translating actions. The device has a high degree of automation.

[0017] 2. In the grinding process, the cutting fluid is directionally introduced into the inner hole of the valve guide through the receiving cover, elastic hose and flushing pipe. The high-positioned drain hole allows the cutting fluid to fill the inner cavity of the workpiece and overflow, thereby forming a convective heat exchange circuit inside the slender inner hole. Compared with the traditional cooling method of external spraying only, this structure can improve the heat exchange efficiency of the valve guide inner hole. After grinding, the servo motor drives the gear transmission mechanism to rotate the baffle plate 180°, so that the drain hole switches to the lower position. Residual cutting fluid in the inner hole is quickly drained by gravity, avoiding residual liquid from dripping and contaminating the equipment and affecting subsequent clamping and unloading processes. This is beneficial to the stable control of the valve guide machining accuracy. Attached Figure Description

[0018] Figure 1 This is a three-dimensional view of the overall structure of a centerless cylindrical grinding machine device for valve guides.

[0019] Figure 2 This is a side sectional view of a centerless cylindrical grinding machine device for valve guides.

[0020] Figure 3 This is a perspective view of the external structure of the conveying fixture in a centerless cylindrical grinding machine for valve guides.

[0021] Figure 4 This is a three-dimensional structural view of the clamping component and the reversing component in a centerless cylindrical grinding machine device for valve guides.

[0022] Figure 5 This is a three-dimensional structural view of a reversing assembly in a centerless cylindrical grinding machine for valve guides.

[0023] Figure 6 This is a schematic diagram of the "overflow state" of the valve guide coolant in a centerless cylindrical grinding machine device for valve guides.

[0024] Figure 7This is a schematic diagram of the "direct discharge state" of the valve guide coolant in a centerless cylindrical grinding machine device for valve guides.

[0025] Explanation of reference numerals in the attached figures: 1. Grinding headstock; 2. Adjusting frame; 3. Workpiece support frame; 4. Machine tool table; 6. Material conveyor; 9. Grinding wheel; 10. Water pump; 11. Conveying pipe; 12. Recycling tank; 13. Adjusting wheel; 7. Conveying fixture; 71. Adjusting frame; 72. Hydraulic cylinder; 73. Moving part one; 74. Clamping plate; 75. Moving part two; 81. Cooling plate; 82. Receiving cover; 83. Flexible hose; 84. Clamping assembly; 841. Push plate one; 842. Thrust spring one; 843. Push rod one; 844. Baffle plate one; 845. Injection pipe; 85. Reversing assembly; 851. Guide post; 852. Baffle plate two; 853. Push plate two; 854. Thrust spring two; 855. Drain hole; 856. Gear sleeve; 857. Drive gear; 858. Servo motor; 859. Push rod two. Detailed Implementation

[0026] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0027] Example 1: Please refer to Figures 1-7 As shown, this embodiment discloses a centerless cylindrical grinding machine for valve guides, used for infeed grinding of valve guides. It includes a machine table 4, an adjustment frame 2 and a grinding head frame 1 respectively arranged on both sides of the machine table 4, a workpiece support frame 3 arranged between the adjustment frame 2 and the grinding head frame 1 and fixedly installed above the machine table 4, and a conveying fixture 7 arranged above the workpiece support frame 3 for automatically unloading valve guides. The conveying fixture 7 includes an adjustment frame 71 mounted in the middle of the machine table 4, a hydraulic cylinder 72 below the adjustment frame 71, a moving part 73 at the top of the adjustment frame 71 for adjusting the reciprocating movement of the hydraulic cylinder 72, a moving part 75 at the extended end of the hydraulic cylinder 72, and two sets of clamping plates 74 symmetrically arranged inside the moving part 75. It should be noted that: a feeding conveyor 6 for automatically feeding and receiving valve guides is provided on one side of the machine tool table 4, which is existing technology; and a recovery tank 12 for recovering cutting fluid is provided in the middle of the machine tool table 4, which is existing technology.

[0028] A set of clamping plates 74 is provided with clamping components 84 at the end near the valve guide, and another set of clamping plates 74 is provided with reversing components 85 at the end near the valve guide. The clamping components 84 and reversing components 85 cooperate with each other to elastically limit the valve guide axially and to facilitate convective heat transfer in its inner hole.

[0029] It should be noted that the internal structure of moving part 1 73 and moving part 2 75 includes a threaded rod, a drive device, a limiting plate, and a limiting block. The threaded rod is rotatably installed inside the limiting plate, and the drive device is fixedly installed at the end of the limiting plate and fixedly connected to the threaded rod by bolts and nuts. The outer side of the threaded rod is threadedly connected to the limiting block, which slides inside the limiting plate. The bottom of the limiting block is fixedly connected to the hydraulic cylinder 72 below moving part 1 73. The threaded rod in moving part 2 75 is threadedly engaged with the clamping plate 74, which is existing technology. The threaded rod that is threadedly engaged with the clamping plate 74 has bidirectional threads on both sides, which are used to synchronously control the two clamping plates 74 to move closer and further apart. Therefore, moving part 1 73 is a functional device that controls the reciprocating movement of the hydraulic cylinder 72, and moving part 2 75 is a functional device that adjusts the two clamping plates 74 to move closer and further apart. Both are existing technologies, so as to adapt to different types of valve guide elastic clamping and unloading. To further clarify the above, a control adjustment frame 2 and a grinding head frame 1 are provided above the machine tool table 4. The moving equipment moves along the X-axis to adjust the distance between the adjusting wheel 13 and the grinding wheel 9, which facilitates the grinding of valve guides of different diameters. The adjustment is completed before grinding the valve guides, which is existing technology.

[0030] Please see Figures 1-3 As shown, the grinding head holder 1 is equipped with a grinding wheel 9 for grinding valve guides, and the adjusting frame 2 is equipped with an adjusting wheel 13 for adjusting the position of valve guides. The width of the clamping plate 74 is less than the shortest vertical distance from the outer surface of the grinding wheel 9 to the outer surface of the adjusting wheel 13.

[0031] Please see Figures 1-2 , Figure 4 As shown, the regulating frame 2 is equipped with a water pump 10, which is existing technology and is used to transport cutting fluid. The output end of the water pump 10 is equipped with a delivery pipe 11, and the output end of the delivery pipe 11 is connected to a cooling plate 81 for discharging coolant. The output end of the cooling plate 81 is oriented towards the valve guide. The input end of the water pump 10 is connected to an external cutting fluid inlet device and to the filtered cutting fluid in the recovery tank 12.

[0032] It should be noted that the hydraulic cylinder 72, moving part one 73, and moving part two 75 mentioned above are all controlled by a PLC control system.

[0033] In this embodiment, the grinding process of the valve guide is as follows: the valve guide is transferred above the workpiece support frame 3 by external equipment; then, the hydraulic cylinder 72 is moved to the machining station of the valve guide by controlling the moving part 1 73; then, the extension end of the hydraulic cylinder 72 is extended to move the clamping assembly 84 and the reversing assembly 85 to both sides of the valve guide, and the clamping assembly 84, the reversing assembly 85 and the valve guide are kept on the same axis; then, the two clamping plates 74 are moved closer to each other to the limit position by the moving part 2 75, and the axial elastic limit of the valve guide is completed by the elastic squeezing of the clamping assembly 84 and the reversing assembly 85, which cooperates with the workpiece support frame 3 at the bottom to ensure the stability of the valve guide during grinding; then, the grinding of the valve guide is completed by the grinding of the grinding wheel 9, the reversing of the adjusting wheel 13, the radial support of the workpiece support frame 3, the axial elastic clamping limit of the conveying fixture 7, and the discharge of the cutting fluid throughout the grinding process. After the grinding process is completed, the distance between the two clamping plates 74 is further reduced by the control of the second moving part 75, and the plates are moved to the clamping position. The extended end of the hydraulic cylinder 72 retracts, driving the valve guide to move upward. Then, the valve guide is transferred to the top of the unloading conveyor 6 by the first moving part 73. At this time, the extended end of the hydraulic cylinder 72 extends again, completing the automatic unloading of the valve guide. Thus, the fully automated unloading of the valve guide can be completed by following the above steps, and the overall process has a high degree of automation.

[0034] The following is a supplementary explanation of the above valve guide grinding steps: When performing axial elastic limiting grinding on the valve guide, the axial compressive force applied to the valve guide sidewall by the clamping assembly 84 and the reversing assembly 85 is controllable and moderate, achieving only the axial floating limiting function. This does not hinder the normal rotation of the valve guide with the adjusting wheel 13 during the grinding process, and effectively constrains the axial movement and swing deviation of the slender rod-shaped valve guide. This completely solves the technical problems of easy wobbling, poor coaxiality, and low grinding accuracy when grinding slender valve guides. Combined with the radial support of the bottom workpiece support frame 3, it comprehensively ensures the stability and processing accuracy of the grinding process.

[0035] When the grinding is completed and the automatic unloading process begins, the second moving part 75 controls the distance between the two sets of clamping plates 74 to be further reduced. At this time, the clamping assembly 84 and the reversing assembly 85 switch to the elastic clamping mode, applying an increased axial force to the outer wall of the valve guide. This not only firmly clamps the valve guide to achieve reliable transfer and avoids falling or being damaged during the transfer process, but also prevents the valve guide from deforming or scratching due to excessive clamping force. It balances clamping stability and workpiece integrity. With the linkage action of the hydraulic cylinder 72 and the first moving part 73, the fully automatic transfer and unloading of the valve guide after grinding is achieved.

[0036] Example 2, building upon Example 1, addresses the characteristics of this type of valve guide. During grinding, it generates significant heat. Insufficient cooling or uneven temperature distribution can easily lead to localized overheating, posing risks such as minor thermal deformation and grinding burns. Current machining methods often employ external pouring of cutting fluid for cooling. While a small amount of cutting fluid can enter the inner bore, it fails to create effective convection heat transfer within the slender bore, hindering stable control of machining accuracy. This example aims to optimize the process. Please refer to [link to example]. Figures 4-7 As shown, the clamping assembly 84 includes a clamping post fixedly connected to the clamping plate 74. A push plate 841 is slidably disposed inside the clamping post. A thrust spring 842 is disposed between one end of the push plate 841 and the clamping post. A push rod 843 is fixedly connected to the other end of the push plate 841. The extended end of the push rod 843 extends to the outside of the clamping post and is fixedly connected to a baffle plate 844. A flushing pipe 845 extending into the valve guide is vertically disposed on the inner wall of the center of the baffle plate 844. The flushing pipe 845 extends coaxially into the inner hole of the valve guide, with an outer diameter smaller than the inner hole diameter of the valve guide, ensuring smooth flow of cutting fluid.

[0037] Please see Figures 4-7 As shown, an elastic hose 83 is vertically inserted into the top wall of the injection tube 845 near the clamping column 1, and a receiving cover 82 that is sealed and connected to the elastic hose 83 is fixed on the clamping plate 74.

[0038] Please see Figures 4-7 As shown, the receiving port of the receiving cover 82 is positioned directly opposite the output end of the cooling plate 81. Part of the cutting fluid discharged from the cooling plate 81 is diverted into the receiving cover 82.

[0039] It should be noted that the cutting fluid is discharged through the cooling plate 81, most of which completes the grinding of the valve guide, and a small portion is discharged into the inside of the receiving cover 82.

[0040] Please see Figures 4-7 As shown, the reversing assembly 85 includes a second clamping post fixedly connected to the bottom of another clamping plate 74. A second push plate 853 is slidably provided on the inner wall of the second clamping post. A second thrust spring 854 is provided between one end of the second push plate 853 and the clamping plate 74. A second push rod 859 is fixedly connected to the other end of the second push plate 853. The protruding end of the second push rod 859 extends to the outside of the second clamping post and is fixedly connected to a second abutment plate 852. A guide post 851 extending into the valve guide is provided on the side wall of the second abutment plate 852. Both the first abutment plate 844 and the second abutment plate 852 are disc structures of the same size.

[0041] It should be noted that air holes are provided on the outer walls of clamping column one and clamping column two to prevent the stability of the movement of push plate one 841 and push plate two 853 from being affected by air pressure during movement.

[0042] When the equipment switches to the elastic clamping unloading mode, the moving part 2 75 drives the clamping plates 74 on both sides to move synchronously towards the valve guide axis. The two ends of the valve guide push against the first baffle 844 and the second baffle 852 respectively. After the first baffle 844 is subjected to force, it retracts towards the clamping column 1 and squeezes the push rod 843. The push rod 843 simultaneously pushes the push plate 841 to slide along the inner cavity of the clamping column 1, thereby compressing the thrust spring 842 and causing the thrust spring 842 to accumulate elastic restoring force. Similarly, the second baffle 852 is subjected to force. The retraction and synchronous compression of the corresponding thrust spring 854 result in elastic reaction forces on both sides acting symmetrically on both ends of the valve guide, forming an elastic clamping. This structure achieves clamping through elastic force, without rigid hard contact, and the clamping force is uniform and controllable. This ensures the clamping stability during material handling and avoids deformation and scratches on the valve guide end face due to pressure. Furthermore, the baffle plate 844 and the baffle plate 852 adopt a symmetrical elastic assembly structure, and their working principles of force retraction and elastic clamping are completely consistent, ensuring that the valve guide clamping force is balanced and centrally stable.

[0043] Please see Figures 4-7 As shown, the top of the baffle plate 2 852 is provided with a drain hole 855 that communicates with the inside of the valve guide.

[0044] Please see Figures 5-7 As shown, a gear sleeve 856 is fitted on the outer wall of the push rod 2 859 and fixedly connected to the stop plate 2 852. A drive gear 857 is meshed on the outer wall of the gear sleeve 856. A connecting shaft is fixedly provided at the center of the drive gear 857. A servo motor 858 for driving the connecting shaft to rotate is fixedly provided on the clamping column 2.

[0045] It should be noted that the servo motor 858 is existing technology. After the valve guide grinding is completed and before the automatic unloading process, the servo motor 858 controls the rotation of the connecting shaft. The connecting shaft drives the drive gear 857 to rotate, and the drive gear 857 drives the gear sleeve 856 to rotate. The gear sleeve 856 is fixedly connected to the baffle plate 852. Therefore, the baffle plate 852 rotates 180 degrees along the axis of the push rod 859, adjusting the drain hole 855 to be directly below the baffle plate 852, which facilitates the direct discharge of cutting fluid. Since the baffle plate 852 has ball bearings on the side wall opposite to the valve guide, it ensures that the drain hole 855 rotates smoothly.

[0046] Please see Figure 6 As shown, ball grooves are provided on the side walls of the first baffle plate 844 and the second baffle plate 852 opposite to the valve guide end face. Balls that can roll freely are embedded in the ball grooves. The balls protrude to the outside of the end face of the first baffle plate 844 and the second baffle plate 852 in a partial manner to reduce the frictional resistance when the valve guide rotates and reverses.

[0047] The operating principle of this embodiment is as follows: During the grinding of the valve guide, a small portion of the cutting fluid enters the interior of the elastic hose 83 through the receiving cover 82, and then enters the flushing pipe 845 through the elastic hose 83. Since the drain hole 855 is located above the baffle plate 852, the cutting fluid gradually fills the interior of the valve guide, and then overflows and is discharged through the drain hole 855, forming effective convection heat transfer in the slender inner hole, which is beneficial to the stable control of the valve guide machining accuracy. After grinding, before the automatic unloading process, the servo motor 858 drives the drive gear 857 to rotate, which in turn drives the gear sleeve 856 to rotate, rotating the drain hole 855 180 degrees and moving it directly below the baffle plate 852 to drain the cutting fluid inside the valve guide. That is, under the grinding condition, the drain hole 855 is in a high position, realizing the overflow of liquid in the valve guide. Before unloading, the position of the drain hole 855 can be switched to quickly drain the residual cutting fluid in the inner hole by gravity, avoiding residual liquid from dripping and contaminating the equipment and affecting the subsequent clamping and unloading processes, which is conducive to the stable control of the machining accuracy of the valve guide.

[0048] The operating principle of this embodiment is further explained as follows: During the grinding process, although the axial extrusion force applied to the valve guide by the baffle 1 844 and the baffle 2 852 is controllable and moderate, a small amount of cutting fluid will leak through the gap between the baffle 1 844, the baffle 2 852 and the valve guide. This leakage is negligible and does not affect the effective convective heat transfer to the valve guide.

[0049] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A centerless cylindrical grinding machine for valve guides, used for infeed grinding of valve guides, comprising a machine table (4), an adjustment frame (2) and a grinding head frame (1) respectively disposed on both sides of the machine table (4), and a workpiece support frame (3) disposed between the adjustment frame (2) and the grinding head frame (1) and fixedly mounted above the machine table (4), characterized in that, It also includes a conveying fixture (7) set above the workpiece support frame (3) for automatically unloading valve guides; the conveying fixture (7) includes an adjustment frame (71) mounted in the middle of the machine tool table (4), a hydraulic cylinder (72) is provided below the adjustment frame (71), a moving part (73) is provided at the top of the adjustment frame (71) to adjust the reciprocating movement of the hydraulic cylinder (72), a moving part (75) is provided at the extended end of the hydraulic cylinder (72), and two sets of clamping plates (74) are symmetrically arranged inside the moving part (75); a clamping assembly (84) is provided at the end of one set of clamping plates (74) near the valve guide, and a reversing assembly (85) is provided at the end of the other set of clamping plates (74) near the valve guide. The clamping assembly (84) and the reversing assembly (85) cooperate with each other to elastically limit the valve guide axially and to convect and transfer heat to its inner hole.

2. The valve guide centerless cylindrical grinding machine apparatus as described in claim 1, characterized in that, The grinding head holder (1) is provided with a grinding wheel (9) for grinding valve guides, and the adjusting frame (2) is provided with an adjusting wheel (13) for adjusting valve guides. The width of the clamping plate (74) is less than the shortest vertical distance from the outer surface of the grinding wheel (9) to the outer surface of the adjusting wheel (13).

3. The valve guide centerless cylindrical grinding machine apparatus as described in claim 2, characterized in that, The regulating frame (2) is equipped with a water pump (10), and the output end of the water pump (10) is equipped with a delivery pipe (11). The output end of the delivery pipe (11) is connected to a cooling plate (81) for discharging coolant, and the output end of the cooling plate (81) is set towards the valve guide.

4. The valve guide centerless cylindrical grinding machine apparatus as described in claim 1, characterized in that, The clamping assembly (84) includes a clamping post fixedly connected to the clamping plate (74). A push plate (841) is slidably provided inside the clamping post. A thrust spring (842) is provided between one end of the push plate (841) and the clamping post. A push rod (843) is fixedly connected to the other end of the push plate (841). The extended end of the push rod (843) extends to the outside of the clamping post and is fixedly connected to a baffle plate (844). An inlet pipe (845) extending into the valve guide is vertically provided on the inner wall of the center of the baffle plate (844).

5. The valve guide centerless cylindrical grinding machine apparatus as described in claim 4, characterized in that, An elastic hose (83) is vertically inserted into the top wall of the injection tube (845) near the clamping column, and a receiving cover (82) that is sealed and communicates with the elastic hose (83) is fixed on the clamping plate (74).

6. The valve guide centerless cylindrical grinding machine apparatus as described in claim 5, characterized in that, The receiving port of the receiving cover (82) is arranged opposite to the output end of the cooling plate (81).

7. The valve guide centerless cylindrical grinding machine apparatus as described in claim 6, characterized in that, The reversing assembly (85) includes a clamping post two fixedly connected to the bottom of another clamping plate (74). A push plate two (853) is slidably provided on the inner wall of the clamping post two. A thrust spring two (854) is provided between one end of the push plate two (853) and the clamping plate (74). A push rod two (859) is fixedly connected to the other end of the push plate two (853). The extended end of the push rod two (859) extends to the outside of the clamping post two and is fixedly connected to a stop plate two (852). A guide post (851) extending into the valve guide is provided on the side wall of the stop plate two (852).

8. The valve guide centerless cylindrical grinding machine apparatus as described in claim 7, characterized in that, The top of the second baffle (852) is provided with a drain hole (855) that communicates with the inside of the valve guide.

9. The valve guide centerless cylindrical grinding machine apparatus as described in claim 8, characterized in that, The outer wall of the push rod 2 (859) is fitted with a gear sleeve (856) which is fixedly connected to the baffle plate 2 (852). The outer wall of the gear sleeve (856) is meshed with a drive gear (857). A connecting shaft is fixedly provided at the center of the drive gear (857). A servo motor (858) for driving the connecting shaft to rotate is fixedly provided on the clamping column 2.

10. The valve guide centerless cylindrical grinding machine apparatus as described in claim 7, characterized in that, Both the first baffle plate (844) and the second baffle plate (852) have ball grooves on their sidewalls opposite to the valve guide end face, and the ball grooves are fitted with freely rolling balls.

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