A grinding machine headstock structure

Abstract

This invention discloses a grinding machine headstock structure, relating to the field of grinding machine technology. It includes a horizontally positioned base plate with a headstock positioning module for positioning one end of the workpiece. A tailstock positioning module is also provided on the base plate for positioning the other end of the workpiece. The headstock positioning module includes a headstock support mounted on the base plate, with a headstock tip at one end of the headstock support facing the tailstock positioning module. A mandrel is housed within the headstock support and fixed therein by a connecting seat. Positioning chucks for driving workpiece rotation are symmetrically positioned on both sides of the headstock tip. A positioning frame is fixedly mounted on one side of the rotating part, which is rotatably sleeved on the mandrel. A rotating module is also provided within the headstock support. This invention uses a sealing mechanism to prevent external contaminants from entering, thus avoiding any impact on the rotating module within the headstock support.

Description

Technical Field

[0001] This invention relates to the field of grinding machine technology, specifically to a grinding machine headstock structure. Background Technology

[0002] The grinding headstock is one of the core components of precision grinding equipment such as cylindrical grinding machines and thread grinding machines. Its main functions include: holding the workpiece in place (usually in conjunction with the tailstock, positioned by a center), driving the workpiece rotation, and achieving automatic indexing in multi-start thread grinding. The working environment of the grinding headstock is extremely harsh. During the grinding process, a large amount of cutting oil (or coolant) is used for cooling and lubrication, while a large amount of grinding wheel dust and metal chips are generated. These contaminants mix to form a high concentration of oil mist and sludge, which can easily penetrate into the interior of the headstock.

[0003] Currently, in common grinding machine headstock structures, the sealing method between the rotating spindle and the headstock housing mostly uses contact seals, such as skeleton oil seals, rubber sealing rings, or felt rings. These contact seals rely on the tight fit and relative sliding between the sealing lip and the rotating surface to prevent contaminants from entering. Under ideal operating conditions, contact seals can meet certain protection requirements.

[0004] However, in actual use, the above-mentioned grinding machines have the following defects: First, contact seals are inevitably subject to wear. Due to continuous sliding friction between the sealing lip and the rotating part, the sealing lip will gradually wear down as the headstock operates, leading to an increase in the sealing gap and a decrease in sealing effectiveness. This wear is an inherent defect of contact seals and cannot be avoided.

[0005] Secondly, grinding wheel dust and metal chips significantly accelerate the wear of seals. The large number of fine grinding wheel particles (such as silicon carbide or corundum) and metal chips generated during grinding are suspended in the cutting oil, forming a cutting fluid with an abrasive effect. When this cutting fluid containing hard particles comes into contact with contact seals, the particles become embedded in the sealing lip or rotate with the shaft, accelerating the wear of the sealing lip like an abrasive, and even grinding grooves into the rotating part, further damaging the sealing effect.

[0006] Third, after the seal fails, contaminants directly enter the bearings, leading to loss of headstock accuracy and shortened lifespan. Once the contact seal fails, cutting oil containing dust will quickly enter the headstock, contaminating the grease in the rolling bearings and causing abrasive wear, pitting, or even seizing of the bearing raceways and rolling elements. Simultaneously, contaminants will also enter the gear transmission pairs (especially precision gears used for indexing), causing a decrease in transmission accuracy. Ultimately, the entire headstock must be prematurely scrapped or undergo costly repairs. Summary of the Invention

[0007] The purpose of this invention is to provide a grinding headstock structure to solve the problems of the contact-type sealing structure used in existing grinding headstocks, which has obvious defects such as rapid wear of seals, short protection life, and easy damage to bearings in harsh grinding environments containing a large amount of grinding wheel dust and metal chips.

[0008] The technical problem to be solved by the present invention can be achieved by the following technical solution: a grinding headstock structure, including a horizontally arranged base plate, a headstock positioning module is provided on the base plate, the headstock positioning module is used to position one end of the workpiece to be processed, and a tailstock positioning module is also provided on the base plate, the tailstock positioning module is used to position the other end of the workpiece to be processed. The head frame positioning module includes a head frame support mounted on the base plate. A head frame tip is provided at one end of the head frame support that is close to the tail frame positioning module. A mandrel is provided inside the head frame support, and the mandrel is fixed in the head frame support by a connecting seat. The headstock tip is symmetrically provided with positioning chucks on both sides for driving the workpiece to rotate. The positioning frame is fixedly arranged on one side of the rotating part. The rotating part is rotatably sleeved on the spindle. The headstock support is also provided with a rotating module for driving the rotating part to rotate. A sealing mechanism is provided between the rotating part and the head frame support, which is used to seal the space between the rotating part and the head frame support.

[0009] Preferably, the rotating module includes a driven gear rotatably arranged on the spindle, a servo motor fixedly installed on one side of the inner side of the head frame support, and a driving gear fixedly connected to the output end of the servo motor, with the driving gear and the driven gear meshing with each other; The sealing mechanism is located between the rotating part and the driven gear.

[0010] Preferably, both the driving gear and the driven gear are configured as helical gears.

[0011] Preferably, the sealing mechanism includes multiple first sealing rings fixedly arranged between the rotating part and the driven gear, with each first sealing ring closely arranged, and also includes multiple second sealing rings arranged on the spindle, with each second sealing ring closely arranged and corresponding to the first sealing rings one by one. Multiple intersecting annular protrusions and grooves are respectively machined on the first sealing rings and the second sealing rings to form a non-contact labyrinth sealing structure. The first sealing ring is also provided with a pressure cap around its periphery.

[0012] Preferably, the bottom of the head support is provided with an oil drain for conveying lubricating oil; Among them, a precision throttle valve is also provided on the outside of the head frame support, and the other end of the precision throttle valve is connected to a compressed air pump.

[0013] Preferably, a dial is fixedly arranged on the side of the rotating part away from the head frame support, and a through groove for the top of the head frame to pass through is opened at the center end of the dial. The dials on both sides of the through groove have sliding grooves, and slide seats are slidably embedded in the sliding grooves. The opposite ends of the positioning clamps on both sides are fixedly connected to the positioning seats, and the positioning seats are fixedly connected to the slide seats by positioning bolts.

[0014] Preferably, the end of the headstock tip away from the tailstock positioning module is fixedly connected to the headstock top rod, and a headstock core groove for embedding the headstock top rod is provided at the axis of the mandrel; The end of the spindle facing the tailstock positioning module is screwed with a nut.

[0015] Preferably, the tailstock positioning module includes a tailstock support mounted on the base plate, a tailstock tip is provided at one end of the tailstock support near the headstock support, and the end of the tailstock tip away from the headstock support is fixedly connected to the tailstock top rod. The tailstock support has a positioning groove, in which a tailstock fixing shaft is fixedly embedded. The central end of the tailstock fixing shaft has a tailstock core groove for embedding the tailstock top rod.

[0016] Preferably, a support plate is slidably arranged on the base plate, and the connecting seat is fixed on the support plate; The base plate is also equipped with a drive module, which is used to drive the tray to slide on the base plate.

[0017] Preferably, the driving assembly includes a cylinder mounted on the base plate, with one end of the cylinder fixedly connected to the support plate, the driving end of the cylinder fixedly connected to the floating joint, the other end of the floating joint fixedly connected to the push rod, a limiting seat fixedly mounted on the base plate, the end of the push rod away from the floating joint slidingly through the limiting seat, a stop seat threadedly fixed on the push rod, and a return spring provided on the push rod between the stop seat and the limiting seat.

[0018] Compared with the prior art, the beneficial effects of this application are as follows: 1. When processing a workpiece, the present invention first uses the headstock positioning module and the tailstock positioning module to position the workpiece from both ends. Then, the rotating module drives the rotating part to rotate on the mandrel. During the rotation of the mandrel, the positioning chuck can be driven to rotate synchronously. The positioning chuck can drive the positioned workpiece to rotate around the top of the headstock. During the cutting process of the workpiece, the sealing mechanism seals the rotating part and the headstock support to ensure the sealing of the headstock support.

[0019] 2. When the grinding machine of the present invention is working, a large amount of cooling oil (or cutting fluid) and grinding wheel dust and metal dust form highly polluting oil mist and sludge. These pollutants can easily penetrate into the headstock support through the gap of the rotating part, causing wear of the rotating module and greatly shortening its life. The present invention prevents external pollutants from entering through the sealing mechanism, so as to avoid pollutants affecting the rotating module in the headstock support.

[0020] 3. Current technologies typically employ contact-type sealing structures, but contact-type seals (such as oil seals) wear out extremely quickly in dusty environments. This invention, however, uses a non-contact labyrinth sealing structure, causing contaminants to change their flow direction multiple times in the tortuous channels, resulting in kinetic energy attenuation and making it difficult for them to penetrate deep into the interior. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of a grinding machine headstock structure according to the present invention. Figure 1 ; Figure 2 This is a three-dimensional structural diagram of a grinding machine headstock structure according to the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the main structure of a grinding machine headstock according to the present invention; Figure 4 This is a schematic diagram of the internal structure of a grinding machine headstock structure according to the present invention; Figure 5 This is a cross-sectional schematic diagram of a grinding machine headstock structure according to the present invention; Figure 6 This is a three-dimensional structural diagram of the headstock support in a grinding machine headstock structure according to the present invention; Figure 7 This is a schematic diagram of the cylinder structure in a grinding machine headstock structure according to the present invention; Figure 8 This is a schematic diagram of the servo motor in a grinding machine headstock structure according to the present invention; Figure 9 This is a schematic diagram of the gear structure in a grinding headstock structure of the present invention.

[0022] Explanation of reference numerals in the attached figures: 1. Base plate; 2. Headstock positioning module; 3. Tailstock positioning module; 4. Driven gear; 5. Oil drain; 6. Dial; 7. Servo motor; 8. Cylinder; 101. Support plate; 201. Headstock support; 202. Headstock center; 203. Connecting seat; 204. Mandrel; 205. Headstock core groove; 206. Headstock push rod; 207. Precision throttle valve; 301. Tailstock support; 302. Tailstock center; 303. Tailstock push rod; 304. Tailstock fixing shaft; 305. Positioning groove; 306. 401. Tailstock core groove; 402. Second sealing ring; 403. First sealing ring; 404. Labyrinth seal structure; 405. Nut; 406. Pressure cap; 607. Floating joint; 608. Slide groove; 609. Slide seat; 6000. Positioning seat; 6001. Positioning bolt; 6002. Positioning chuck; 601. Rotating part; 702. Drive gear; 803. Through groove; 804. Limit seat; 805. Stop seat; 806. Return spring; 807. Guide rail; 808. Guide seat; 808. Push rod. Detailed Implementation

[0023] 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.

[0024] Example 1 The contact-type sealing structure used in the headstock of the current grinding machine has obvious defects such as rapid wear of the seal, short protection life, and easy damage to the bearings in the harsh grinding environment containing a large amount of grinding wheel dust and metal chips.

[0025] like Figures 1 to 4 as well as Figure 6 In this embodiment, a grinding machine headstock structure includes a horizontally arranged base plate 1. A headstock positioning module 2 is provided on the base plate 1. The headstock positioning module 2 is used to position one end of the workpiece to be processed. A tailstock positioning module 3 is also provided on the base plate 1. The tailstock positioning module 3 is arranged opposite to the headstock positioning module 2 and is used to position the other end of the workpiece to be processed. Specifically, before processing the workpiece, the workpiece to be processed is first placed between the headstock positioning module 2 and the tailstock positioning module 3. Then, the headstock positioning module 2 and the tailstock positioning module 3 cooperate to position and fix the workpiece to be processed from both ends, so as to facilitate subsequent processing. In this embodiment, the head frame positioning module 2 includes a head frame support 201 arranged on the base plate 1. A head frame tip 202 is provided at one end of the head frame support 201 that is close to the tail frame positioning module 3. A spindle 204 is provided inside the head frame support 201. The spindle 204 is fixed in the head frame support 201 by a connecting seat 203. In one embodiment of this invention, positioning chucks 606 for driving workpiece rotation are symmetrically arranged on both sides of the headstock tip 202. The positioning frame 606 is fixedly arranged on one side of the rotating part 607, which is rotatably sleeved on the spindle 204. The headstock support 201 is also provided with a rotating module for driving the rotating part 607 to rotate. Specifically, after the workpiece to be processed in this embodiment is positioned, the rotating part 607 can be driven to rotate on the spindle 204 by the rotating module. During the rotation of the spindle 204, the positioning chucks 606 can be driven to rotate synchronously. The positioning chucks 606 can drive the positioned workpiece to rotate around the headstock tip 202 to achieve subsequent processing.

[0026] Furthermore, in order to prevent cutting oil containing dust from entering the headstock support 201 and causing contamination during the workpiece cutting process, in this embodiment, a sealing mechanism is provided between the rotating part 607 and the headstock support 201. The sealing mechanism is used to seal the space between the rotating part 607 and the headstock support 201. The working principle of this embodiment is as follows: When processing the workpiece, the headstock positioning module 2 and the tailstock positioning module 3 are used to position the workpiece from both ends. Then, the rotating module drives the rotating part 607 to rotate on the spindle 204. During the rotation of the spindle 204, the positioning chuck 606 can be driven to rotate synchronously. The positioning chuck 606 can drive the positioned workpiece to rotate around the headstock tip 202. During the cutting process of the workpiece, the sealing mechanism is used to seal the rotating part 607 and the headstock support 201 to ensure the sealing of the headstock support 201. It should be emphasized that the core improvement of this embodiment is that when the grinding machine in this embodiment is working, a large amount of cooling oil (or cutting fluid) and grinding wheel dust and metal dust form highly polluting oil mist and sludge. These pollutants can easily enter the headstock support 201 through the gap of the rotating part 607, causing wear of the rotating module and greatly shortening its life. This embodiment prevents external pollutants from entering by setting a sealing mechanism, so as to avoid pollutants affecting the rotating module in the headstock support 201.

[0027] It should be noted that, such as Figures 5-9 As shown, the rotating module includes a driven gear 4 rotatably mounted on the spindle 204, a servo motor 7 fixedly mounted on one side of the inner side of the head frame support 201, and a driving gear 701 fixedly connected to the output end of the servo motor 7. The driving gear 701 and the driven gear 4 mesh with each other. The sealing mechanism is arranged between the rotating part 607 and the driven gear 4. Specifically, in this embodiment, when driving the rotating part 607 to move, the servo motor 7 is started first. During the rotation of the servo motor 7, the driving gear 701 is driven to rotate first. The driving gear 701 can synchronously drive the driven gear 4 to rotate on the spindle 204. Finally, the rotating part 607 can be driven to move through the driven gear 4. As a further embodiment, both the driving gear 701 and the driven gear 4 are configured as helical gears. It should be noted that both the driving gear 701 and the driven gear 4 are helical gears to improve transmission smoothness and indexing accuracy. The servo motor 7 drives the workpiece to be processed to rotate or index according to a set angle according to the instructions of the CNC system. It should be further explained that the existing belt drive has poor indexing accuracy, the direct drive motor is expensive and generates a lot of heat, and the traditional spur gear drive is noisy and has limited load-bearing capacity. In contrast, the helical gear drive of this embodiment has a large overlap, runs smoothly and has low noise, making it suitable for precision grinding. Moreover, its indexing accuracy is significantly higher than that of the belt drive, meeting the requirements of multi-start thread grinding. Compared with the direct drive motor solution, it has lower cost, is easier to maintain, and distributes heat. At the same time, the helical gear drive has high rigidity and strong impact resistance, making it suitable for intermittent grinding conditions.

[0028] Please refer to Figures 5-7 The sealing mechanism of this embodiment includes multiple first sealing rings 402 fixedly arranged between the rotating part 607 and the driven gear 4, with each first sealing ring 402 closely arranged. It also includes multiple second sealing rings 401 arranged on the spindle 204, with each second sealing ring 401 closely arranged and corresponding to the first sealing rings 402 one by one. Multiple intersecting annular protrusions and grooves are respectively machined on the first sealing rings 402 and the second sealing rings 401 to form a non-contact labyrinth sealing structure 403. The first sealing rings 402 are also provided with a pressure cap 405. Specifically, the pressure cap 405 is fixed to the head frame support 201, and the end of the pressure cap 405 that is close to the first sealing rings 402 is also provided with a non-contact labyrinth sealing structure 403 to further ensure the sealing performance.

[0029] The core improvement of this embodiment is that the existing technology usually adopts a contact sealing structure, and contact seals (such as oil seals) wear out very quickly in dusty environments. However, this embodiment sets a non-contact labyrinth sealing structure 403, which causes pollutants to change their flow direction multiple times in the tortuous channel, resulting in kinetic energy attenuation and making it difficult for them to penetrate deep into the interior.

[0030] As a further embodiment, the bottom of the head support 201 is provided with an oil drain 5 for conveying lubricating oil; Specifically, by setting up oil drain 5, lubricating oil can be delivered to the moving parts for lubrication. During operation, a drainage port is provided at the bottom of the head support 201. Even if some oil enters the head support 201 along the labyrinth seal structure 403, these small amounts of liquid can flow out naturally along the drainage port.

[0031] In addition, a precision throttle valve 207 is provided on the outside of the head frame support 201 in this embodiment, and the other end of the precision throttle valve 207 is connected to a compressed air pump. It should be noted that in this embodiment, clean compressed air is input into the head frame support 201 through the precision throttle valve 207 by the compressed air pump, so that there is a slight positive pressure gas in the head frame support 201. Under the action of positive pressure, it can further prevent external pollutants from entering.

[0032] It should be noted that, in order to install the positioning chuck 606, in this embodiment, you can refer to... Figures 7-9 A dial 6 is fixedly arranged on the side of the rotating part 607 away from the headstock support 201. A through groove 801 for the headstock tip 202 to pass through is opened at the center end of the dial 6. Slide grooves 602 are respectively opened on the dial 6 on both sides of the through groove 801. A slide seat 603 is slidably embedded in the slide groove 602. The opposite ends of the positioning clamps 606 on both sides are fixedly connected to the positioning seat 604. The positioning seat 604 is fixedly connected to the slide seat 603 by the positioning bolt 605. Specifically, for different workpieces, in this embodiment, the position of the slide seat 603 can be adjusted in the slide groove 602 first. After adjustment, the positioning seat 604 is fixedly connected to the slide seat 603 by the positioning bolt 605, thereby achieving the effect of adjusting the distance between the positioning clamps 606 on both sides.

[0033] like Figures 5 to 6 In this embodiment, in order to install the headstock tip 202, the end of the headstock tip 202 away from the tailstock positioning module 3 is fixedly connected to the headstock top rod 206, and the headstock core groove 205 for embedding the headstock top rod 206 is provided at the axis of the mandrel 204; wherein, the end of the mandrel 204 facing the tailstock positioning module 3 is screwed with a nut 404; It should be noted that in this embodiment, the inner diameter of the head frame core groove 205 gradually decreases in the direction away from the tail frame positioning module 3, which further improves the installation stability of the head frame top rod 206 when installing the head frame top rod 206.

[0034] As another embodiment of this example, the tail frame positioning module 3 includes a tail frame support 301 arranged on the base plate 1. A tail frame tip 302 is provided at one end of the tail frame support 301 that is close to the head frame support 201. The end of the tail frame tip 302 that is away from the head frame support 201 is fixedly connected to the tail frame top rod 303. A positioning groove 305 is provided in the tail frame support 301. A tail frame fixing shaft 304 is fixedly embedded in the positioning groove 305. A tail frame core groove 306 for embedding the tail frame top rod 303 is provided at the axial end of the tail frame fixing shaft 304. It should be noted that in this embodiment, the inner diameter of the tailstock core groove 306 gradually decreases in the direction away from the headstock support 201, which further improves the installation stability of the tailstock top rod 303 when installing the tailstock top rod 303.

[0035] Example 2 It is understandable that, in Embodiment 1, when positioning the workpiece to be processed, the prior art requires manual adjustment of the distance between the tailstock tip 302 and the headstock tip 202, which has low adjustment accuracy and is not convenient to operate.

[0036] like Figures 5 to 9 To solve the above problems, a support plate 101 is slidably arranged on the base plate 1, and a connecting seat 203 is fixed on the support plate 101. The base plate 1 is also provided with a drive module, which is used to drive the support plate 101 to slide on the base plate 1. Specifically, in this embodiment, when positioning the workpiece to be processed, the workpiece to be processed can be placed between the tailstock tip 302 and the headstock tip 202. Then, the support plate 101 is driven to slide towards the tailstock support 301 by the drive module. During the movement of the support plate 101, the headstock support 201 can be moved synchronously, thereby driving the headstock tip 202 and the tailstock tip 302 to press against both ends of the workpiece.

[0037] To improve the stability of the pallet 101 moving on the base plate 1, in this embodiment, two sets of guide rails 805 are symmetrically fixedly arranged on the base plate 1, and guide seats 806 that are fixedly connected to the pallet 101 are slidably sleeved on the guide rails 805 on both sides; specifically, when the drive module drives the pallet 101 to move, it can guide and limit the movement through the guide seats 806 and the guide rails 805 to ensure the stability of its movement.

[0038] Specifically, the driving assembly in this embodiment includes a cylinder 8 mounted on a base plate 1. The end of the cylinder 8 is fixedly connected to a support plate 101. The driving end of the cylinder 8 is fixedly connected to a floating joint 601. The other end of the floating joint 601 is fixedly connected to a push rod 807. A limiting seat 802 is fixedly mounted on the base plate 1. The end of the push rod 807 away from the floating joint 601 slides through the limiting seat 802. A stop 803 is also threadedly fixed on the push rod 807. A return spring 804 is provided on the push rod 807 between the stop 803 and the limiting seat 802. The working principle of this embodiment is as follows: When the head frame tip 202 moves, gas can be input or output into the cylinder 8 first. Based on the air pressure, the cylinder 8 can be driven to move on the base plate 1. During the movement of the cylinder 8, the support plate 101 can be driven to slide on the base plate 1 simultaneously, thereby realizing the position adjustment of the head frame tip 202.

[0039] It should be emphasized that the core improvement of this embodiment is that: the cylinder body of the cylinder 8 in this embodiment is fixed on the support plate 101 by a fixing block, and the piston rod of the cylinder 8 is connected to the push rod 807 through a floating joint 601. The floating joint 601 allows for a small radial offset and angular deviation between the push rod 807 and the piston rod, thereby compensating for installation errors or workpiece center hole position errors. When the cylinder 8 is inlet, it pushes the headstock tip 202 forward to press against the workpiece center hole; when the cylinder 8 is outlet, the headstock tip 202 retracts and releases the workpiece.

[0040] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed application.

Claims

1. A grinding machine headstock structure, characterized by, The system includes a horizontally arranged base plate (1), on which a headstock positioning module (2) is provided. The headstock positioning module (2) is used to position one end of the workpiece to be processed. The base plate (1) is also provided with a tailstock positioning module (3), which is used to position the other end of the workpiece to be processed. The head frame positioning module (2) includes a head frame support (201) arranged on the base plate (1), a head frame tip (202) is provided at one end of the head frame support (201) that is close to the tail frame positioning module (3), and a mandrel (204) is provided inside the head frame support (201). The mandrel (204) is fixed in the head frame support (201) through a connecting seat (203). The headstock tip (202) is symmetrically provided with positioning chucks (606) on both sides for driving the workpiece to rotate. The positioning frame (606) is fixedly arranged on one side of the rotating part (607). The rotating part (607) is rotatably sleeved on the spindle (204). The headstock support (201) is also provided with a rotating module for driving the rotating part (607) to rotate. A sealing mechanism is provided between the rotating part (607) and the head frame support (201), and the sealing mechanism is used to seal the rotating part (607) and the head frame support (201).

2. A grinding machine headstock structure as claimed in claim 1, characterised in that, The rotating module includes a driven gear (4) rotatably arranged on the spindle (204), and a servo motor (7) is fixedly installed on one side of the inner side of the head frame support (201). The output end of the servo motor (7) is fixedly connected to the driving gear (701), and the driving gear (701) meshes with the driven gear (4). The sealing mechanism is located between the rotating part (607) and the driven gear (4).

3. A grinding machine headstock structure as claimed in claim 2, characterised in that, Both the driving gear (701) and the driven gear (4) are configured as helical gears.

4. A grinding machine headstock structure as claimed in claim 2, wherein The sealing mechanism includes multiple first sealing rings (402) fixedly arranged between the rotating part (607) and the driven gear (4), with each first sealing ring (402) closely arranged. It also includes multiple second sealing rings (401) arranged on the spindle (204), with each second sealing ring (401) closely arranged and corresponding to the first sealing rings (402). Multiple intersecting annular protrusions and grooves are respectively machined on the first sealing rings (402) and the second sealing rings (401) to form a non-contact labyrinth sealing structure (403). The first sealing ring (402) is also provided with a pressure cap (405) around its periphery.

5. A grinding machine headstock structure as claimed in claim 4, characterised in that, The bottom of the head support (201) is provided with an oil drain (5) for conveying lubricating oil; Among them, a precision throttle valve (207) is also provided on the outside of the head frame support (201), and the other end of the precision throttle valve (207) is connected to a compressed air pump.

6. A grinding machine headstock structure as claimed in claim 4, wherein The rotating part (607) is fixedly provided with a dial (6) on the side away from the head frame support (201), and a through groove (801) for the head frame tip (202) is opened at the center end of the dial (6). Among them, the dials (6) on both sides of the through groove (801) are respectively provided with sliding grooves (602), and sliding seats (603) are slidably embedded in the sliding grooves (602). The opposite ends of the positioning clamps (606) on both sides are fixedly connected to the positioning seat (604). The positioning seat (604) is fixedly connected to the sliding seat (603) by positioning bolts (605).

7. A grinding machine headstock structure as claimed in claim 1, characterised in that, The end of the head frame tip (202) away from the tail frame positioning module (3) is fixedly connected to the head frame top rod (206), and the head frame core groove (205) for embedding the head frame top rod (206) is provided at the axis of the mandrel (204). The mandrel (204) is screwed with a nut (404) at one end toward the tailstock positioning module (3).

8. A grinding machine headstock structure as claimed in claim 1, characterised in that, The tail frame positioning module (3) includes a tail frame support (301) arranged on the base plate (1), and a tail frame tip (302) is provided at one end of the tail frame support (301) that is close to the head frame support (201). The end of the tail frame tip (302) that is away from the head frame support (201) is fixedly connected to the tail frame top rod (303). The tailstock support (301) has a positioning groove (305) and a tailstock fixing shaft (304) is fixedly embedded in the positioning groove (305). The core end of the tailstock fixing shaft (304) has a tailstock core groove (306) for embedding the tailstock top rod (303).

9. A grinding machine headstock structure as claimed in claim 1, characterised in that, A support plate (101) is slidably arranged on the base plate (1), and a connecting seat (203) is fixed on the support plate (101); The base plate (1) is also provided with a drive module, which is used to drive the tray (101) to slide on the base plate (1).

10. A grinding machine headstock structure as claimed in claim 9, characterised in that, The drive assembly includes a cylinder (8) mounted on a base plate (1). The end of the cylinder (8) is fixedly connected to a support plate (101). The drive end of the cylinder (8) is fixedly connected to a floating joint (601). The other end of the floating joint (601) is fixedly connected to a push rod (807). A limiting seat (802) is fixedly mounted on the base plate (1). The end of the push rod (807) away from the floating joint (601) slides through the limiting seat (802). A stop (803) is also threaded onto the push rod (807). A return spring (804) is provided on the push rod (807) between the stop (803) and the limiting seat (802).

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