Tailstock mechanism for radially adjusting center and grinding machine

Abstract

The utility model provides a tailstock mechanism for radially adjusting a centre and a grinding machine, a radial fine-tuning clearance-eliminating assembly is arranged on a grinding machine tailstock, the radial fine-tuning clearance-eliminating assembly comprises an internal thread bushing, a screw rod and an elastic piece, and the internal thread bushing only needs to be fixedly arranged on a first seat body of the grinding machine tailstock; and the first end of the screw rod is rotationally arranged on the second seat body of the grinding machine tailstock, the second end of the screw rod is screwed in the internal thread sleeve, and the elastic piece abuts against the position between the internal thread sleeve and the screw rod. As the second seat body can be arranged on the first seat body in a sliding manner along the radial direction of the tip of the tip assembly, the second seat body can be driven to slide for a small distance along the radial direction of the tip only by rotating the screw rod, so that the tip on the second seat body can be subjected to position fine adjustment along the radial direction of the tip; and the coaxiality of the center and a main shaft or a workpiece on a grinding machine is effectively ensured. Moreover, in the process of rotating the screw rod, a reverse gap generated when the screw rod rotates to drive the second seat body to move can be eliminated through the elastic force action of the elastic piece.

Description

Technical Field

[0001] The utility model belongs to the technical field of machine tool equipment, and in particular relates to a tailstock mechanism and a grinder for radially adjusting a center. Background Art

[0002] A grinder is a multi-purpose machine tool, which is suitable for grinding external circles, internal holes and planes, and is also suitable for sharpening general cutting tools, such as reamers, sleeve reamer drills, various milling cutters and gear hobs, etc. At present, a tailstock mechanism is usually installed on a grinder to position the workpiece. Since the center assembly on the tailstock mechanism can only be extended axially and cannot be fine-tuned radially, and the center assembly needs to have strict coaxiality with the spindle or workpiece, it is difficult to ensure the coaxiality between the center and the spindle or workpiece, resulting in a large deviation in the accuracy of the grinder processing workpiece and affecting product quality. 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 tailstock mechanism for radially adjusting the center, so as to solve the problem that the center on the tailstock mechanism in the prior art cannot achieve radial fine-tuning, resulting in difficulty in ensuring the coaxiality of the center and the spindle or workpiece.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a tailstock mechanism for radially adjusting the center, comprising:

[0005] A tailstock of a grinding machine, comprising a first seat body and a second seat body for mounting a center assembly, wherein the second seat body can be slidably arranged on the first seat body along the radial direction of the center of the center assembly; and

[0006] A radial fine-tuning anti-backlash assembly is used to drive the second seat body to slide along the radial direction of the top, so that the top on the second seat body can achieve position fine-tuning without reverse backlash along the radial direction of the top;

[0007] Among them, the radial fine-tuning and anti-backlash assembly includes an internally threaded sleeve fixedly set on the first seat body, a screw rotatably set on the second seat body and screwed into the internally threaded sleeve, and an elastic member for eliminating the reverse gap generated when the screw rotates, and the elastic member is supported between the internally threaded sleeve and the screw.

[0008] Furthermore, the elastic member is an anti-backlash spring sleeved on the screw rod, the first end of the anti-backlash spring abuts against the internal threaded sleeve, and the second end of the anti-backlash spring abuts against the abutment portion on the screw rod.

[0009] Furthermore, the radial fine-tuning anti-backlash assembly also includes an anti-backlash nut sleeved on the screw rod, the second end of the anti-backlash spring abuts against the anti-backlash nut, and the anti-backlash nut constitutes the abutting portion.

[0010] Furthermore, the anti-backlash nut is fixed on the screw rod at a position adjacent to the internal threaded sleeve.

[0011] Furthermore, the radial fine-tuning backlash-eliminating assembly further comprises a rotating sleeve sleeved on one end of the screw away from the internal thread sleeve and a rotating cover fixedly arranged on the rotating sleeve, and the rotating sleeve is rotatably mounted on the second seat body.

[0012] Furthermore, the rotating cover is provided with a dial for indicating the rotation angle of the rotating cover, and the second base is provided with an indicating portion corresponding to the scale on the dial.

[0013] Furthermore, a positioning piece is provided on the internal threaded sleeve along its radial direction, a positioning hole for inserting the positioning piece and a first threaded hole connected to the positioning hole are provided on the first seat body, the radial fine-tuning and anti-backlash assembly also includes a bolt screwed into the first threaded hole, a second threaded hole connected to the positioning hole is provided on the positioning piece, and an end of the bolt away from its head is screwed into the second thread.

[0014] Furthermore, the positioning member and the internal threaded sleeve are integrally formed.

[0015] Furthermore, the tailstock mechanism for radially adjusting the center also includes a center assembly matched with the second seat body, and the center assembly includes a center seat axially slidably arranged on the second seat body, a center axially slidably arranged in the center seat, a pushing mechanism for pushing the center seat to move in a direction away from the workpiece, and a pre-tightening pressure regulating mechanism for pressing the center toward the outside of the center seat.

[0016] 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 tailstock mechanism for radially adjusting the center in any of the above solutions.

[0017] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a grinding machine, including the tailstock mechanism for radially adjusting the center provided by any of the above-mentioned solutions.

[0018] 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:

[0019] The tailstock mechanism and grinder for radially adjusting the top in the embodiment of the utility model are provided with a radial fine-tuning anti-backlash assembly on the tailstock of the grinder. The radial fine-tuning anti-backlash assembly includes an internal thread sleeve, a screw and an elastic member. The internal thread sleeve only needs to be fixedly provided on the first seat body of the tailstock of the grinder, the first end of the screw rod is rotated and provided on the second seat body of the tailstock of the grinder, the second end of the screw rod is screwed into the internal thread sleeve, and the elastic member is supported between the internal thread sleeve and the screw rod. Since the second seat body equipped with the top assembly can be slidably provided on the first seat body along the radial direction of the top of the top assembly, the second seat body only needs to be rotated to slide a small distance along the radial direction of the top, so that the top on the second seat body can be fine-tuned along the radial direction of the top. Moreover, in the process of rotating the screw, the elastic force of the elastic member can eliminate the reverse clearance generated when the screw rotates and drives the second seat body to move, thereby effectively avoiding the idle travel in the process of the screw driving the second seat body to slide along the radial direction of the center point, thereby making the radial fine-tuning of the center point on the second seat body more precise, and allowing the center point on the tailstock mechanism to maintain high-precision coaxiality with the spindle or workpiece on the grinder, which is beneficial to improving the accuracy of workpiece processing on the grinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 A schematic diagram of the structure of the tailstock mechanism for radially adjusting the center provided by the utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along line AA;

[0023] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure along the HH line.

[0024] Among them, the reference numerals in the figure are:

[0025] 1-grinding machine tailstock; 11-first seat body; 12-second seat body; 13-slider; 14 slide groove; 15-indicator;

[0026] 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; 261- dial; 27- positioning member; 28- bolt;

[0027] 3- Positioning hole;

[0028] 4-top assembly; 41-top seat; 42-top;

[0029] 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;

[0030] 6-driving mechanism; 61-hydraulic chamber; 62-piston; 63-first rack; 64-linked gear; 65-second rack. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] Please also read Figures 1 to 3 The tailstock mechanism for radially adjusting the center provided in the embodiment of the utility model is now described. The tailstock mechanism for radially adjusting the center provided in the embodiment of the utility model is suitable for radially fine-tuning the center 42 on the tailstock mechanism, so that the center 42 on the tailstock mechanism can maintain good coaxiality with the spindle or workpiece on the grinding machine, so as to improve the accuracy of workpiece processing by the grinding machine.

[0038] Please refer to further Figure 1 , Figure 2 and Figure 3The tailstock mechanism for radially adjusting the top provided by the embodiment of the utility model comprises a grinder tailstock 1 and a radial fine-tuning anti-backlash assembly 2. The grinder tailstock 1 comprises a first seat body 11 and a second seat body 12 for matching and mounting the top assembly 4. The first seat body 11 is provided with a slider 13, and the second seat body 12 is provided with a slide groove 14 slidably matched with the slider 13. The slider 13 is slidably installed in the slide groove 14, so that the second seat body 12 can be slidably arranged on the first seat body 11 along the radial direction of the top 42 of the top assembly 4. The radial fine-tuning anti-backlash assembly 2 can drive the second seat body 12 to slide along the radial direction of the top 42, so that the top 42 on the second seat body 12 can realize position fine-tuning without reverse clearance along the radial direction of the top 42, so that the top 42 on the tailstock mechanism can maintain good coaxiality with the spindle or workpiece on the grinder. Specifically, the radial fine-tuning and anti-backlash assembly 2 includes an internal threaded sleeve 21, a screw 22 and an elastic member 23. The internal threaded sleeve 21 is fixedly arranged on the first seat body 11, and the first end of the screw 22 is rotatably arranged on the second seat body 12. The second end of the screw 22 is screwed into the internal threaded sleeve 21, and the elastic member 23 is supported between the internal threaded sleeve 21 and the screw 22. In the process of rotating the screw 22, the reverse clearance generated when the screw 22 rotates can be eliminated by the elastic force of the elastic member 23, thereby preventing the screw 22 from driving the second seat body 12 to slide radially along the top 42. In this way, the radial fine-tuning of the top 42 on the second seat body 12 is more precise, so that the top 42 on the tailstock mechanism is precisely aligned with the spindle or workpiece on the grinding machine.

[0039] Compared with the prior art, the tailstock mechanism for radially adjusting the top provided by the embodiment of the utility model is characterized by providing a radial fine-tuning anti-backlash assembly 2 on the tailstock 1 of the grinder, wherein the radial fine-tuning anti-backlash assembly 2 includes an internal thread sleeve 21, a screw rod 22 and an elastic member 23. It is only necessary to fix the internal thread sleeve 21 on the first seat body 11 of the tailstock 1 of the grinder, rotate the first end of the screw rod 22 on the second seat body 12 of the tailstock 1 of the grinder, screw the second end of the screw rod 22 into the internal thread sleeve 21, and hold the elastic member 23 between the internal thread sleeve 21 and the screw rod 22. Since the second seat body 12 equipped with the top assembly 4 can be slidably provided on the first seat body 11 along the radial direction of the top 42 of the top assembly 4, it is only necessary to rotate the screw rod 22 to drive the second seat body 12 to slide a small distance along the radial direction of the top 42, so that the top 42 on the second seat body 12 can be finely adjusted in position along the radial direction of the top 42. 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 and drives 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 point 42 while walking in idle motion. This makes the radial fine-tuning of the top point 42 on the second seat body 12 more precise, and enables the top point 42 on the tailstock mechanism to maintain good coaxiality with the spindle or workpiece on the grinder, which is beneficial to improving the accuracy of workpiece processing on the grinder.

[0040] Please refer to Figure 1 , Figure 2 and Figure 3 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 42. 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.

[0041] Please refer to Figure 1 , Figure 2 and Figure 3 In 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 anti-backlash 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.

[0042] Please refer to Figure 1 , Figure 2 and Figure 3 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.

[0043] Please refer to Figure 1 , Figure 2 and Figure 3 In some embodiments, the radial fine-tuning 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 42, so that the top 42 on the second seat body 12 can be fine-tuned along the radial direction of the top 42.

[0044] Please refer to Figure 1 , Figure 2 and Figure 3 In some embodiments, a dial 261 for indicating the rotation angle of the rotating cover 26 is provided on the rotating cover 26, and an indicating portion 15 corresponding to the scale on the dial 261 is provided on the second seat body 12. When the second seat body 12 needs to be adjusted to a preset position according to the debugging requirements of the fine adjustment of the top 42, it is only necessary to rotate the rotating cover 26 to drive the screw 22 to rotate until the corresponding scale on the dial 261 on the rotating cover 26 is aligned or aligned with the indicating portion 15 on the second seat body 12, so that the rotation angle of the screw 22 can be adjusted quickly and accurately, which is conducive to the user to accurately adjust the centering position of the top 42 on the second seat body 12 according to the processing requirements, and makes the fine adjustment debugging of the top 42 on the second seat body 12 more convenient and accurate. It should be noted that the indicating portion 15 can be, but is not limited to, an indicating mark such as an indicating arrow, an indicating line or an indicating protrusion provided on the second seat body 12.

[0045] Please refer to Figure 1 , Figure 2 and Figure 3 In some embodiments, a positioning member 27 is provided on the internal threaded sleeve 21 along its radial direction, a positioning hole 3 for inserting the positioning member 27 and a first threaded hole connected to the positioning hole 3 are provided on the first seat body 11, and the radial fine-tuning anti-backlash assembly 2 also includes a bolt 28 screwed into the first threaded hole, and a second threaded hole connected to the positioning hole 3 is provided on the positioning member 27, and the end of the bolt 28 away from the head thereof is screwed into the second thread. In this embodiment, it is only necessary to insert the positioning member 27 into the positioning hole 3 on the first seat body 11, and then rotate the head of the bolt 28 so that the bolt 28 can pull the positioning member 27 to be firmly embedded in the positioning hole 3, so that the internal threaded sleeve 21 can be firmly positioned on the first positioning seat, and the internal threaded sleeve 21 can be quickly disassembled and assembled conveniently. It should be noted that the positioning member 27 is integrally formed with the internal threaded sleeve 21, which further enhances the stability of the installation of the internal threaded sleeve 21.

[0046] Please refer to Figure 1 , Figure 2 and Figure 3In some embodiments, the tailstock mechanism for radially adjusting the center also includes a preload pressure regulating mechanism 5 and a pushing mechanism 6, which are arranged on the second seat body 12 of the tailstock 1 of the grinder. The preload pressure regulating mechanism 5 is used to drive the center seat 3 to move toward the workpiece, so that the center 42 can hold and position the workpiece with a preset preload force. Specifically, the preload pressure regulating mechanism 5 includes a first spring seat 51 connected to the center seat 3, a threaded screw 52 rotatably arranged on the tailstock 1 of the grinder through a bearing 10 and a support 20, a second spring seat 53 with an internal threaded hole, and a preload 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. In this embodiment, by setting a preload pressure regulating mechanism 5 for positively pushing the top seat 3 and a pushing mechanism 6 for reversely pushing the top 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, and the compressed preload spring 54 can push the top 42 on the top seat 3 toward the workpiece until the top 42 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 top seat 3 through the pushing mechanism 6, so that the pushing mechanism 6 pushes the top seat 3 to move in a direction away from the workpiece, and the automatic retraction of the top 42 can be realized quickly and smoothly. Therefore, during the unloading and loading process of the grinder, the top 42 can be automatically retracted quickly and smoothly without manually controlling the retraction of the top 42, which can meet the automation requirements of the CNC grinder and is conducive to improving the processing efficiency of the grinder.

[0047] Please refer to Figure 1 , Figure 2 and Figure 3 In 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 .

[0048] Please refer to Figure 1 , Figure 2 and Figure 3 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.

[0049] Please refer to Figure 1 , Figure 2 and Figure 3In 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 structure 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 automatic retraction of the center 42 can be realized quickly and smoothly.

[0050] The embodiment of the utility model also provides a grinding machine, which includes the tailstock mechanism for radially adjusting the top provided in any of the above embodiments. Since the grinding machine has all the technical features of the tailstock mechanism for radially adjusting the top provided in any of the above embodiments, it has the same technical effect as the tailstock mechanism for radially adjusting the top.

[0051] 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 tailstock mechanism for radially adjusting a center, characterized in that: include: The tailstock of the grinding machine comprises a first seat body and a second seat body for matching and mounting a top assembly, wherein the second seat body can be slidably arranged on the first seat body along the radial direction of the top of the top assembly; as well as A radial fine-tuning anti-backlash assembly is used to drive the second seat body to slide along the radial direction of the top, so that the top on the second seat body can achieve position fine-tuning without reverse backlash along the radial direction of the top; Among them, the radial fine-tuning and anti-backlash assembly includes an internally threaded sleeve fixedly set on the first seat body, a screw rotatably set on the second seat body and screwed into the internally threaded sleeve, and an elastic member for eliminating the reverse gap generated when the screw rotates, and the elastic member is supported between the internally threaded sleeve and the screw.

2. The tailstock mechanism for radially adjusting the center according to claim 1, characterized in that: The elastic member is an anti-backlash spring sleeved on the screw rod, the first end of the anti-backlash spring abuts against the internal thread sleeve, and the second end of the anti-backlash spring abuts against the abutment portion on the screw rod.

3. The tailstock mechanism for radially adjusting the center as claimed in claim 2, characterized in that: The radial fine-tuning anti-backlash assembly also includes an anti-backlash nut sleeved on the screw rod, the second end of the anti-backlash spring abuts against the anti-backlash nut, and the anti-backlash nut constitutes the abutting portion.

4. The tailstock mechanism for radially adjusting the center as claimed in claim 3, characterized in that: The anti-backlash nut is fixed on the screw rod at a position adjacent to the internal thread sleeve.

5. The tailstock mechanism for radially adjusting the center as claimed in claim 1, characterized in that: The radial fine-tuning anti-backlash assembly also includes a rotating sleeve sleeved on one end of the screw away from the internal thread sleeve and a rotating cover fixedly arranged on the rotating sleeve, and the rotating sleeve is rotatably mounted on the second seat body.

6. The tailstock mechanism for radially adjusting the center according to claim 5, characterized in that: The rotating cover is provided with a dial for indicating the rotation angle of the rotating cover, and the second seat body is provided with an indicating portion corresponding to the scale on the dial.

7. The tailstock mechanism for radially adjusting the center as claimed in claim 1, characterized in that: The internal threaded sleeve is provided with a positioning piece along its radial direction, the first seat body is provided with a positioning hole for inserting the positioning piece and a first threaded hole connected with the positioning hole, the radial fine-tuning anti-backlash assembly also includes a bolt screwed into the first threaded hole, the positioning piece is provided with a second threaded hole connected with the positioning hole, and the end of the bolt away from its head is screwed into the second thread.

8. The tailstock mechanism for radially adjusting the center as claimed in claim 7, characterized in that: The positioning member and the internal thread sleeve are integrally formed.

9. The tailstock mechanism for radially adjusting the center according to any one of claims 1 to 8, characterized in that: The tailstock mechanism for radially adjusting the center also includes a center assembly matched with the second seat body, and the center assembly includes a center seat axially slidably arranged on the second seat body, a center axially slidably arranged in the center seat, a pushing mechanism for pushing the center seat to move in a direction away from the workpiece, and a pre-tightening pressure regulating mechanism for pressing the center toward the outside of the center seat.

10. A grinding machine, characterized in that: It comprises a tailstock mechanism for radially adjusting a center as claimed in any one of claims 1 to 9.

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