Center device and grinding machine

Abstract

According to the center device and the grinding machine provided by the utility model, the pre-tightening pressure regulating mechanism for forwards pushing the center seat and the pushing mechanism for reversely pushing the center seat back are arranged on the tailstock of the grinding machine, so that during feeding of the grinding machine, only the threaded screw rod needs to be rotated to drive the second spring seat to move towards the first spring seat; and the pre-tightening spring located between the first spring seat and the second spring seat is compressed, and the compressed pre-tightening spring can push the center on the center seat to be ejected towards the workpiece until the center plays a role in ejecting and positioning the workpiece with the preset pre-tightening force. And when the grinding machine is used for discharging, the pushing mechanism only needs to push the center seat to move towards the direction far away from the workpiece, so that the center can automatically return quickly and stably. Therefore, in the feeding and discharging process of the grinding machine, the center can be rapidly, stably and automatically retreated without being controlled to retreat manually, the requirement for automation of the numerical control grinding machine can be met, and the machining efficiency of the grinding machine can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of machine tool equipment, in particular to a top device and a grinding machine. Background Art

[0002] A grinder is a multi-purpose machine tool that is suitable for grinding outer circles, inner holes and planes, and is also suitable for sharpening general cutting tools such as reamers, sleeve-type reamers, various milling cutters and gear hobs. During the use of the grinder, the function of the center device is to hold one end of the workpiece to be processed to limit the position, so as to facilitate the grinding of the workpiece. Currently, when the center device holds and positions the workpiece, the center on the center device is usually quickly pushed into place by an elastic mechanism. However, when the grinder needs to load and unload materials, it is usually necessary to manually control the elastic mechanism to achieve the retraction of the center, which is not only difficult to meet the automation requirements of the CNC grinder, but also difficult to achieve a fast and smooth retraction of the center, resulting in low processing efficiency of the grinder. Utility Model Content

[0003] Based on the above-mentioned problems existing in the prior art, one of the purposes of the embodiments of the utility model is to provide a center device to solve the problem that the center device in the prior art relies on manual operation to control the retraction of the center, which not only cannot meet the automation requirements of CNC grinders, but also cannot achieve the retraction of the center quickly and smoothly.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is: to provide a top device, including:

[0005] Grinding machine tailstock;

[0006] A center seat, slidably arranged on the tailstock of the grinder;

[0007] A top point, arranged on the top point seat;

[0008] A preload pressure regulating mechanism, used for driving the center seat to move toward the workpiece, so that the center can hold and position the workpiece with a preset preload force; and

[0009] A pushing mechanism, used for pushing the center seat to move in a direction away from the workpiece, so that the center seat drives the center seat to retract, and the pushing mechanism is arranged on the tailstock of the grinder;

[0010] Among them, the preload pressure regulating mechanism includes a first spring seat connected to the top seat, a threaded screw rotatably set on the tail stock of the grinder, a second spring seat with an internal threaded hole, and a preload spring arranged between the first spring seat and the second spring seat, and the second spring seat is screwed onto the threaded screw through the internal threaded hole.

[0011] Furthermore, a guide sleeve for guiding the center seat to move along the axial direction of the center is provided on the tailstock of the grinding machine, and the center seat is slidably installed in the guide sleeve.

[0012] Furthermore, a pre-tensioning cavity is provided on the top seat, the first spring seat is fixedly arranged in the pre-tensioning cavity, the second spring seat is slidably arranged in the pre-tensioning cavity, the pre-tensioning spring is located in the pre-tensioning cavity, the first end of the pre-tensioning spring abuts against the first spring seat, and the second end of the pre-tensioning spring abuts against the second spring seat.

[0013] Furthermore, the preload pressure regulating mechanism also includes a pressure regulating handle for driving the threaded screw to rotate, and the pressure regulating handle is connected to the tail end of the threaded screw.

[0014] Furthermore, the preload pressure regulating mechanism also includes a stopper for cooperating with and stopping the second spring seat to limit the moving position of the second spring seat, and the stopper is arranged at the head end of the threaded screw.

[0015] Further, the pushing mechanism includes a hydraulic chamber provided on the tailstock of the grinder, a piston slidably provided in the hydraulic chamber, a first rack provided on the piston, a linkage gear rotatably provided on the tailstock of the grinder, and a second rack provided on the top seat, the first rack is parallel to the second rack and is spaced apart, and the linkage gear is respectively meshed with the first rack and the second rack.

[0016] Furthermore, a gear cavity is provided on the tailstock of the grinding machine, and the linkage gear is rotatably installed in the gear cavity through a rotating shaft, and the linkage gear is fixedly sleeved on the rotating shaft.

[0017] Furthermore, the tip device also includes a rotating handle for driving the rotating shaft to rotate so as to manually push the tip seat to move, and the rotating handle is connected to the rotating shaft.

[0018] Furthermore, the tailstock of the grinding machine includes a first seat body and a second seat body, the second seat body can be slidably arranged on the first seat body along the radial direction of the top point, the top point device also includes a radial fine-tuning and anti-backlash assembly for driving the second seat body to slide radially along the top point, the radial fine-tuning and anti-backlash assembly includes an internal threaded sleeve fixedly arranged on the first seat body, a screw rotatably arranged on the second seat body and screwed into the internal threaded sleeve, and an elastic member for eliminating the reverse clearance generated when the screw rotates, and the elastic member is supported between the internal threaded sleeve and the screw.

[0019] Based on the above problems existing in the prior art, a second purpose of the embodiment of the utility model is to provide a grinding machine having a top device in any of the above solutions.

[0020] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a grinding machine, including the top device provided by any of the above-mentioned solutions.

[0021] Compared with the prior art, the above one or more technical solutions in the embodiments of the present invention have at least one of the following beneficial effects:

[0022] The center device and grinder in the embodiment of the utility model are provided with a preload pressure regulating mechanism for pushing the center seat forward and a pushing mechanism for pushing the center seat back in the opposite direction on the tailstock of the grinder. When loading on the grinder, it is only necessary to rotate the threaded screw so that the threaded screw drives the second spring seat to move toward the first spring seat, compressing the preload spring between the first spring seat and the second spring seat. The compressed preload spring can push the center on the center seat toward the workpiece until the center plays a stable supporting and positioning role on the workpiece with a preset preload force. When unloading from the grinder, it is only necessary to overcome the elastic force of the preload spring on the center seat through the pushing mechanism so that the pushing mechanism pushes the center seat to move in a direction away from the workpiece, thereby realizing the automatic retraction of the center quickly and smoothly. Therefore, during the unloading and loading process of the grinder, the center can be automatically retracted quickly and smoothly without the need for manual control of the retraction of the center, which can meet the automation requirements of the CNC grinder and is conducive to improving the processing efficiency of the grinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A schematic diagram of the structure of the top device provided by the utility model;

[0025] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along line AA.

[0026] Among them, the reference numerals in the figure are:

[0027] 1- grinder tailstock; 11- first seat body; 12- second seat body; 13- guide sleeve; 14- gear cavity;

[0028] 2- radial fine adjustment anti-backlash assembly; 21- internal thread sleeve; 22- screw rod; 23- elastic member; 24- anti-backlash nut; 25- rotating sleeve; 26- rotating cover;

[0029] 3-top seat; 4-top;

[0030] 5-preload pressure regulating mechanism; 51-first spring seat; 52-threaded screw; 53-second spring seat; 54-preload spring; 55-pressure regulating handle; 56-stopper;

[0031] 6-driving mechanism; 61-hydraulic chamber; 62-piston; 63-first rack; 64-linked gear; 65-second rack;

[0032] 7-preload chamber; 8-rotating axis; 9-rotating handle;

[0033] 10-bearing; 20-support. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] It should be noted that when an element is referred to as being "connected to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a dedicated orientation, be constructed and operated in a dedicated orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] Reference throughout the specification to "one embodiment" or "an embodiment" means that the specialized features, structures, or characteristics described in connection with the embodiment are included in at least one embodiment of the present application. Thus, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, not all of which refer to the same embodiment. Furthermore, in one or more embodiments, the specialized features, structures, or characteristics may be combined in any suitable manner.

[0040] Please also read Figure 1 to Figure 2The top device provided by the embodiment of the utility model is now described. The top device provided by the embodiment of the utility model includes a grinder tailstock 1, a top seat 3, a top 4, a pre-tightening pressure regulating mechanism 5 and a pushing mechanism 6. The top seat 3 can be slidably arranged on the grinder tailstock 1 along the axial direction of the top 4. The top 4 is arranged on the top seat 3. The position of the top 4 can be adjusted by moving and adjusting the position of the top seat 3, and the top 4 can be pushed out so that the top 4 can play a supporting and positioning role on the workpiece. The pre-tightening pressure regulating mechanism 5 is used to drive the top seat 3 to move toward the workpiece, so that the top 4 can support and position the workpiece with a preset pre-tightening force. Specifically, the pre-tightening pressure regulating mechanism 5 includes a first spring seat 51 connected to the top seat 3, a threaded screw 52 rotatably arranged on the grinder tailstock 1 through a bearing 10 and a support 20, a second spring seat 53 with an internal threaded hole, and a pre-tightening spring 54 arranged between the first spring seat 51 and the second spring seat 53, and the second spring seat 53 is screwed on the threaded screw 52 through the internal threaded hole. When in use, it is only necessary to rotate the threaded screw 52. Under the cooperation of the external thread of the threaded screw 52 and the internal thread hole of the second spring seat 53, the threaded screw 52 drives the second spring seat 53 to move toward the first spring seat 51 to achieve the compression of the preload spring 54. The compressed preload spring 54 can push the first spring seat 51 and the top seat 3. The top seat 3 then drives the top 4 to be ejected toward the workpiece until the top 4 is in close contact with the workpiece with a preset preload force. Under the elastic force of the preload spring 54, the top 4 can achieve a stable holding and positioning effect on the workpiece. Since the grinding machine tailstock 1 is provided with a pushing mechanism 6, when it is necessary to release the holding and positioning effect of the top 4 on the workpiece, it is only necessary to overcome the elastic force of the preload spring 54 through the pushing mechanism 6 and push the top seat 3 to move in the direction away from the workpiece, so that the top 4 can be automatically retracted quickly and smoothly, which is convenient for the unloading operation of the grinding machine. When the workpiece needs to be held and positioned by the top 4 again, the thrust of the pushing mechanism 6 on the top seat 3 only needs to be cancelled, and the compressed preload spring 54 can push the first spring seat 51 and the top seat 3 again, and the top seat 3 then drives the top 4 to be pushed out toward the workpiece until the top 4 has a stable holding and positioning effect on the workpiece with a preset preload force. In addition, during the process of the top 4 holding and positioning the workpiece, the second spring seat 53 can be driven to move toward or away from the first spring seat 51 by rotating the threaded screw 52, ​​so as to adjust the holding pressure of the preload pressure regulating mechanism 5 on the workpiece.

[0041] Compared with the prior art, the centering device provided by the embodiment of the utility model is provided with a preload pressure regulating mechanism 5 for positively pushing the centering seat 3 and a pushing mechanism 6 for reversely pushing the centering seat 3 on the tailstock 1 of the grinder. When loading the grinder, it is only necessary to rotate the threaded screw 52 so that the threaded screw 52 drives the second spring seat 53 to move toward the first spring seat 51, compressing the preload spring 54 located between the first spring seat 51 and the second spring seat 53. The compressed preload spring 54 can push the centering seat 4 on the centering seat 3 toward the workpiece until the centering seat 4 plays a stable supporting and positioning role on the workpiece with a preset preload force. When unloading the grinder, it is only necessary to overcome the elastic force of the preload spring 54 on the centering seat 3 through the pushing mechanism 6 so that the pushing mechanism 6 pushes the centering seat 3 to move in a direction away from the workpiece, so that the automatic retraction of the centering seat 4 can be realized quickly and smoothly. Therefore, during the unloading and loading process of the grinder, the centering seat 4 can be automatically retracted quickly and smoothly without manually controlling the retraction of the centering seat 4, which can meet the automation requirements of the CNC grinder and is conducive to improving the processing efficiency of the grinder.

[0042] Please refer to Figure 1 and Figure 2 In some of the embodiments, a guide sleeve 13 is provided on the tailstock 1 of the grinder to guide the center seat 3 to move along the axial direction of the center seat 4. The center seat 3 is slidably installed in the guide sleeve 13, which can improve the stability and reliability of the center seat 3 driving the center seat 4 to eject, and effectively prevent the center seat from deflecting when driving the center seat 4 to eject, thereby affecting the coaxiality of the center seat 4 and the workpiece.

[0043] Please refer to Figure 1 and Figure 2 In some embodiments, a preload cavity 7 is provided on the top seat 3, a first spring seat 51 is fixedly disposed in the preload cavity 7, a second spring seat 53 is slidably disposed in the preload cavity 7, a preload spring 54 is located in the preload cavity 7, a first end of the preload spring 54 abuts against the first spring seat 51, and a second end of the preload spring 54 abuts against the second spring seat 53. In this example, by fixing the first spring seat 51 in the preload cavity 7, slidably disposing the second spring seat 53 in the preload cavity 7, and disposing the preload spring 54 in the preload cavity 7 between the first spring seat 51 and the second spring seat 53, the preload spring 54 can be stably compressed by the first spring seat 51 and the second spring seat 53, and the compressed preload spring 54 can stably push the top 4 on the top seat 3 toward the workpiece to be ejected, thereby preventing the preload spring 54 from swinging and bouncing during the compression process.

[0044] Please refer to Figure 1 and Figure 2In some of the embodiments, in order to facilitate the rotation of the threaded screw 52 , the preload pressure regulating mechanism 5 also includes a pressure regulating handle 55 for driving the threaded screw 52 to rotate, and the pressure regulating handle 55 is connected to the tail end of the threaded screw 52 .

[0045] Please refer to Figure 1 and Figure 2 In some embodiments, in order to prevent the first spring seat 51 and the second spring seat 53 from over-compressing the preload spring 54 and causing damage to the top seat 3, the preload pressure regulating mechanism 5 also includes a stopper 56 for cooperating with the second spring seat 53 to stop the second spring seat 53 to limit the moving position of the second spring seat 53, and the stopper 56 is arranged at the head end of the threaded screw 52.

[0046] Please refer to Figure 1 and Figure 2 In some embodiments, the pushing mechanism 6 includes a hydraulic chamber 61 provided on the tailstock 1 of the grinder, a piston 62 slidably provided in the hydraulic chamber 61, a first rack 63 provided on the piston 62, a linkage gear 64 rotatably provided on the tailstock 1 of the grinder, and a second rack 65 provided on the center seat 3. The first rack 63 and the second rack 65 are parallel and spaced apart, and the linkage gear 64 is meshed with the first rack 63 and the second rack 65, respectively. In this embodiment, by providing the hydraulic chamber 61 on the tailstock 1 of the grinder, the compactness of the center device is improved, which is conducive to reducing the volume of the center device. When hydraulic oil is pumped into the hydraulic chamber 61 by the hydraulic pump, the hydraulic oil pushes the piston 62 to move in the hydraulic chamber 61, and the piston 62 drives the first rack 63 to move at the same time. Since the linkage gear 64 is meshed with the first rack 63 and the second rack 65 at the same time, the second rack 65 can drive the center seat 3 to move in the direction away from the workpiece, so that the center 4 can be automatically retracted quickly and smoothly.

[0047] Please refer to Figure 1 and Figure 2 In some of the embodiments, in order to ensure the accuracy and efficiency of the transmission of the linkage gear 64 and avoid gear jumping during the transmission of the linkage gear 64, a gear cavity 14 is provided on the tailstock 1 of the grinding machine, and the linkage gear 64 is rotatably installed in the gear cavity 14 through the rotating shaft 8, and the linkage gear 64 is fixedly mounted on the rotating shaft 8.

[0048] Please refer to Figure 1 and Figure 2 In some embodiments, the top device also includes a rotating handle 9 for driving the rotating shaft 8 to rotate so as to manually push the tip seat to move. The rotating handle 9 is connected to the rotating shaft 8. When the pressure in the hydraulic chamber 61 is released, the rotating shaft 8 can be manually rotated by the rotating handle 9, and the second rack 65 can be driven to move by the linkage gear 64. The moving second rack 65 can drive the top seat 3 to move in a direction away from the workpiece, so that the automatic retraction of the top 4 can be achieved quickly and smoothly.

[0049] Please refer to Figure 1 and Figure 2 In some embodiments, the tailstock 1 of the grinding machine includes a first seat body 11 and a second seat body 12. The second seat body 12 can be slidably arranged on the first seat body 11 along the radial direction of the top 4. The pushing mechanism 6 and the preload pressure regulating mechanism 5 are both arranged on the second seat body 12. The top device also includes a radial fine-tuning anti-backlash assembly 2 for driving the second seat body 12 to slide along the radial direction of the top 4. The radial fine-tuning anti-backlash assembly 2 includes an internal thread sleeve 21 fixedly arranged on the first seat body 11, a screw 22 rotatably arranged on the second seat body 12 and screwed into the internal thread sleeve 21, and an elastic member 23 for eliminating the reverse gap generated when the screw 22 rotates. The elastic member 23 is held between the internal thread sleeve 21 and the screw 22. Since the top 4 of the second seat body 12 is radially slidably arranged on the first seat body 11, the second seat body 12 can be driven to slide a small distance along the radial direction of the top 4 by rotating the screw 22, so that the top 4 on the second seat body 12 can be fine-tuned along the radial direction of the top 4. Moreover, in the process of rotating the screw 22, the elastic force of the elastic member 23 can eliminate the reverse clearance generated when the screw 22 rotates to drive the second seat body 12 to move, thereby effectively preventing the screw 22 from driving the second seat body 12 to slide radially along the top 4 while walking in idle motion. This makes the radial fine-tuning of the top 4 on the second seat body 12 more precise, and enables the top 4 on the tailstock mechanism to maintain high-precision coaxiality with the spindle or workpiece on the grinder, thereby facilitating improving the accuracy of workpiece processing on the grinder.

[0050] Please refer to Figure 1 and Figure 2 In some embodiments, the elastic member 23 is an anti-backlash spring sleeved on the screw rod 22, the first end of the anti-backlash spring abuts against the internal thread sleeve 21, and the second end of the anti-backlash spring abuts against the abutment portion on the screw rod 22. Since the anti-backlash spring abuts between the internal thread sleeve 21 and the screw rod 22, the energy of the anti-backlash spring can be slowly released to better absorb slight vibrations and weak impact energy. In the process of rotating the screw rod 22, the reverse clearance generated when the screw rod 22 rotates and drives the second seat body 12 to move can be eliminated by the elastic force of the anti-backlash spring, effectively avoiding the screw rod 22 driving the second seat body 12 to slide radially along the top 4. It should be noted that the elastic member 23 can be but is not limited to an anti-backlash spring, and the elastic member 23 can also be an elastic sheet or elastic pad abutted between the internal thread sleeve 21 and the screw rod 22.

[0051] Please refer to Figure 1 and Figure 2In some embodiments, the radial fine-tuning anti-backlash assembly 2 further includes an anti-backlash nut 24 sleeved on the screw rod 22, and the second end of the anti-backlash spring abuts against the anti-backlash nut 24, and the anti-backlash nut 24 constitutes an abutment portion. The anti-backlash nut 24 cooperates with the internal threaded sleeve 21 to abut against both ends of the spring, so that the energy of the anti-backlash spring can be released slowly, stably and evenly to better absorb slight vibration and weak impact energy.

[0052] Please refer to Figure 1 and Figure 2 In some of the embodiments, the anti-backlash nut 24 is fixed on the screw rod 22 at a position close to the internal threaded sleeve 21, which can shorten the distance between the anti-backlash nut 24 and the internal threaded sleeve 21, so that the anti-backlash spring has a smaller expansion and contraction amount, thereby enhancing the buffering performance of the anti-backlash spring in absorbing slight vibrations and weak impact energy, and effectively eliminating the reverse clearance generated when the screw rod 22 rotates to drive the second seat body 12 to move.

[0053] Please refer to Figure 1 and Figure 2 In some embodiments, the radial fine-tuning and anti-backlash assembly 2 also includes a rotating sleeve 25 sleeved on the end of the screw 22 away from the internal threaded sleeve 21 and a rotating cover 26 fixedly arranged on the rotating sleeve 25. The rotating sleeve 25 is rotatably installed on the second seat body 12, which is conducive to rotating the screw 22 and driving the second seat body 12 to slide a small distance along the radial direction of the top 4, so that the top 4 on the second seat body 12 can be fine-tuned along the radial direction of the top 4.

[0054] The embodiment of the utility model also provides a grinding machine, which includes the top device provided in any of the above embodiments. Since the grinding machine has all the technical features of the top device provided in any of the above embodiments, it has the same technical effects as the above top device.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A top device, characterized in that, include: Grinding machine tailstock; A center seat, slidably arranged on the tailstock of the grinder; A top point, arranged on the top point seat; A preload pressure regulating mechanism, used for driving the center seat to move toward the workpiece, so that the center can hold and position the workpiece with a preset preload force; and A pushing mechanism, used for pushing the center seat to move in a direction away from the workpiece, so that the center seat drives the center seat to retract, and the pushing mechanism is arranged on the tailstock of the grinder; Among them, the preload pressure regulating mechanism includes a first spring seat connected to the top seat, a threaded screw rotatably set on the tail stock of the grinder, a second spring seat with an internal threaded hole, and a preload spring arranged between the first spring seat and the second spring seat, and the second spring seat is screwed onto the threaded screw through the internal threaded hole.

2. The tip device according to claim 1, characterized in that: The tailstock of the grinding machine is provided with a guide sleeve for guiding the center seat to move along the axial direction of the center seat, and the center seat is slidably installed in the guide sleeve.

3. The tip device according to claim 1, characterized in that: A preload cavity is provided on the top seat, the first spring seat is fixedly disposed in the preload cavity, the second spring seat is slidably disposed in the preload cavity, the preload spring is located in the preload cavity, the first end of the preload spring abuts against the first spring seat, and the second end of the preload spring abuts against the second spring seat.

4. The tip device according to claim 1, characterized in that: The preload pressure regulating mechanism also includes a pressure regulating handle for driving the threaded screw to rotate, and the pressure regulating handle is connected to the tail end of the threaded screw.

5. The tip device according to claim 1, characterized in that: The preload pressure regulating mechanism also includes a stopper for cooperating with and stopping the second spring seat to limit the moving position of the second spring seat, and the stopper is arranged at the head end of the threaded screw.

6. The tip device according to claim 1, characterized in that: The pushing mechanism includes a hydraulic chamber arranged on the tailstock of the grinder, a piston slidably arranged in the hydraulic chamber, a first rack arranged on the piston, a linkage gear rotatably arranged on the tailstock of the grinder, and a second rack arranged on the top seat, the first rack is parallel to the second rack and is arranged at intervals, and the linkage gear is respectively meshed with the first rack and the second rack.

7. The tip device according to claim 6, characterized in that The tailstock of the grinding machine is provided with a gear cavity, the linkage gear is rotatably installed in the gear cavity through a rotating shaft, and the linkage gear is fixedly sleeved on the rotating shaft.

8. The tip device according to claim 7, characterized in that: The tip device also includes a rotating handle for driving the rotating shaft to rotate so as to manually push the tip seat to move, and the rotating handle is connected to the rotating shaft.

9. The tip device according to any one of claims 1 to 8, characterized in that: The tailstock of the grinding machine includes a first seat body and a second seat body, the second seat body can be slidably arranged on the first seat body along the radial direction of the top point, the top point device also includes a radial fine-tuning and anti-backlash assembly for driving the second seat body to slide radially along the top point, the radial fine-tuning and anti-backlash assembly includes an internal threaded sleeve fixedly arranged on the first seat body, a screw rod rotatably arranged on the second seat body and screwed into the internal threaded sleeve, and an elastic member for eliminating the reverse clearance generated when the screw rod rotates, and the elastic member is supported between the internal threaded sleeve and the screw rod.

10. A grinding machine, characterized in that: Comprising a top device as described in any one of claims 1 to 9.

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