A fixed-point processing fixture for columnar products based on a three-point contact centerless grinder

Abstract

The present invention relates to the technical field of grinder fixtures, and more particularly to a fixed-point area processing fixture for columnar products for a three-point contact centerless grinder, comprising a grinder operating table and a columnar workpiece, a protective box fixedly mounted on the surface of the grinder operating table, a rotating member rotatably connected to the interior of the protective box, the rotating member being a cylindrical structure with circular holes at both ends, a driving mechanism for driving the rotating member to rotate being arranged inside the protective box, a connecting tube rotatably penetrating the surface of the rotating member at the positions of the circular holes at both ends, a connector fixedly mounted on the end of the connecting tube. The present invention provides a connecting tube with both ends of the connecting tube being open, so that the columnar workpiece can be directly passed through the connecting tube, and the position to be processed can be placed near the fixed clamping rod, thereby reducing the vibration of the workpiece during the processing and adapting to the use of workpieces of different lengths.

Description

Technical Field

[0001] The invention relates to the technical field of grinder fixtures, in particular to a fixed-point area processing fixture for columnar products used in three-point contact centerless grinders. Background Art

[0002] A grinder is a machine tool that uses abrasive tools to grind the surface of a workpiece. Most grinders use high-speed rotating grinding wheels for grinding, while a few use other grinding tools such as oilstones and abrasive belts and free abrasives for processing, such as honing machines, superfinishing machines, belt grinders, grinders and polishers. When grinding, a triangular clamp is needed to fix the workpiece.

[0003] Traditional grinding machine fixtures generally use triangular jaws to directly place the end of the columnar workpiece against the chuck of the triangular jaws, and then use three jaws to clamp and fix the side wall of the columnar workpiece. However, many columnar workpieces are relatively long, and the triangular jaws can only fix their ends. Therefore, when processing the columnar product in an area far away from the fixed position, due to the toughness of the columnar product itself and the long distance between the processing position and the fixed position, the processing process is prone to large vibrations, resulting in processing difficulties and poor accuracy. Summary of the invention

[0004] The purpose of the present invention is to provide a fixed-point area processing fixture for columnar products based on a three-point contact centerless grinder, which solves the problem that many columnar workpieces in the prior art have a long length, and the triangular claws can only fix their ends. Therefore, when processing operations are performed on an area of ​​the columnar product far away from a fixed position, due to the toughness of the columnar product itself and the long distance between the processing position and the fixed position, the processing process is prone to large vibrations, resulting in processing difficulties and poor precision.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A fixed-point area processing fixture for a columnar product based on a three-point contact centerless grinder, comprising a grinder operating table and a columnar workpiece, wherein a protective box is fixedly installed on the surface of the grinder operating table, a rotating part is rotatably connected inside the protective box, the rotating part is a cylindrical structure with circular holes at both ends, a driving mechanism for driving the rotating part to rotate is arranged inside the protective box, a connecting cylinder is rotatably penetrated on the surface of the rotating part at the positions of the circular holes at both ends, a connecting head is fixedly installed on the end of the connecting cylinder, the columnar workpiece penetrates the connecting cylinder and the connecting head, three clamping rods are slidably penetrated on the surface of the connecting head, a movable ring is sleeved on the surface of the connecting cylinder, three second electric cylinders are fixedly installed on the side wall of the connecting head, the output ports of the three second electric cylinders are fixedly connected to the movable ring, three connecting rods are rotatably connected on the surface of the movable ring, the three connecting rods are respectively rotatably connected to the three clamping rods, and an auxiliary mechanism for assisting the movement of the columnar workpiece and a linkage mechanism for pushing the columnar workpiece are arranged on the surface of the connecting cylinder.

[0007] Preferably, the auxiliary mechanism includes a fixing ring, three first electric cylinders are fixedly installed on the side wall of the fixing ring, a connecting ring is sleeved on the surface of the connecting tube, the output ports of the three first electric cylinders are fixedly connected to the connecting ring, three connecting rods are fixedly installed on the side wall of the connecting ring, three through holes are opened on the surface of the connecting tube, the surfaces of the three through holes are slidably connected with sliders, the top of the slider is opened with an inclined groove, and the port of the slider located inside the connecting tube is evenly rotated and connected with a clamping wheel.

[0008] Preferably, the end of the connecting rod close to the slider is rotatably connected to a roller, a second spring is fixedly installed on the top of the slider, and the end of the second spring away from the slider is fixedly connected to the connecting tube.

[0009] Preferably, the three connecting rods all slide through the movable ring.

[0010] Preferably, the linkage mechanism includes two third electric cylinders, and the two third electric cylinders are respectively fixedly installed on both sides of the movable ring, and the output ports of the two third electric cylinders are fixedly installed with clamping blocks, and the sides of the two clamping blocks away from each other are fixedly installed with limiting rods, and the limiting rods slide through the movable ring, and the sides of the two clamping blocks close to each other are provided with "V"-shaped grooves, and the surface of the connecting tube is provided with through holes to achieve a state where the clamping blocks can extend into the interior of the connecting tube to clamp the cylindrical workpiece.

[0011] Preferably, three guide rods are fixedly mounted on the surface of the connector, and the three clamping rods slide through the three guide rods respectively.

[0012] Preferably, the driving mechanism includes a motor, the motor is fixedly mounted inside the protective box, a driving gear is fixedly mounted on the output shaft port of the motor, a driven gear is fixedly mounted on the surface of the rotating part, and the driving gear and the driven gear are meshed.

[0013] Preferably, a push rod is slidably inserted into the bottom end of the clamp rod, and the bottom end of the clamp rod is located on both sides of the push rod and is rotatably connected to movable rods, both sides of the push rod are provided with teeth, and the two movable rods are respectively engaged with the two sides of the push rod.

[0014] Preferably, the movable rod comprises a clamping plate and a cylindrical gear, the cylindrical gear is welded to the top of the clamping plate, and the cylindrical gear is rotatably connected to the clamping rod, and the cylindrical gears in the movable rods on both sides are respectively meshed with both sides of the top rod.

[0015] Preferably, a first spring is fixedly mounted on the top of the push rod, and one end of the first spring away from the push rod is fixedly connected to the clamping rod.

[0016] The present invention has at least the following beneficial effects:

[0017] By setting up a connecting tube with openings at both ends of the connecting tube, the columnar workpiece can directly pass through the connecting tube, and the position to be processed can be placed near the fixed clamping rod, thereby reducing the vibration of the workpiece during the processing. Compared with the method of directly using triangular claws in the prior art, this method can adapt to the use of workpieces of different lengths and has higher stability.

[0018] By setting a movable ring, it can move on the surface of the connecting tube under the action of the second electric cylinder, thereby driving the clamping rod to move and clamping the workpiece. The mechanical structure is simple and the failure rate is low. Compared with the method of manually tightening the triangular claws in the prior art, this method is more convenient to operate, and the movement of the movable ring can not only fix the workpiece, but also cooperate with the clamping block and the third electric cylinder to realize the movement of the workpiece, so that the worker does not need to move the workpiece manually, and the movement is horizontal movement, which will not cause the workpiece to rotate, thereby making it more convenient to perform processing operations.

[0019] By setting up structures such as the first electric cylinder, the connecting ring, the connecting rod and the slider, when the workpiece needs to be slid to achieve processing at other positions, the first electric cylinder can drive the connecting ring and the connecting rod to move, thereby squeezing the slider, so that the three sliders clamp the workpiece, and the slider is clamped by the clamping wheel, so it will not affect the movement of the workpiece along the rotation direction of the clamping wheel, thereby guiding the movement of the workpiece, and when one end of the workpiece needs to be tightened, the connecting rod can be used to squeeze the slider into the inside of the connecting tube, and then the workpiece is inserted into the inside of the connecting tube, so that one end of the workpiece is abutted by the slider, thereby facilitating the processing operation on the end of the workpiece, so that the workpiece will not move during the processing. Therefore, the slider not only has the function of clamping the workpiece, but also can play the function of tightening the end of the workpiece according to different usage environments.

[0020] By arranging a push rod and a movable rod at the ends of the three clamping rods, it is convenient to clamp the workpiece with the push rod and the two movable rods to achieve three-point contact. Compared with the method of directly using triangular claws in the prior art, only the claws themselves are in contact with the workpiece, and the stability is relatively poor. This method can enhance the clamping effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 For the present invention Figure 1 Side view;

[0024] Figure 3 It is a cross-sectional view of the protection box of the present invention;

[0025] Figure 4 It is a cross-sectional view of the rotating member of the present invention;

[0026] Figure 5 It is a schematic diagram of the connecting rod structure of the present invention;

[0027] Figure 6 It is a schematic diagram of the movable ring structure of the present invention;

[0028] Figure 7 It is a cross-sectional view of the connecting tube of the present invention;

[0029] Figure 8 This is a schematic diagram of the structure of the slider of the present invention;

[0030] Fig. 9 It is a cross-sectional view of the slider of the present invention;

[0031] Fig.10 It is a cross-sectional view of the clamp rod of the present invention;

[0032] Fig.11 It is a cross-sectional view of the movable ring of the present invention.

[0033] In the figure: 1. grinding machine operating table; 2. protective box; 3. columnar workpiece; 4. rotating part; 5. driven gear; 6. driving gear; 7. motor; 8. connecting tube; 9. connecting head; 10. movable ring; 11. connecting rod; 12. clamping rod; 13. fixed ring; 14. first electric cylinder; 15. connecting ring; 16. connecting rod; 17. second electric cylinder; 18. clamping block; 19. third electric cylinder; 20. limiting rod; 21. movable rod; 22. first spring; 23. push rod; 24. roller; 25. slider; 26. clamping wheel; 27. second spring; 28. inclined groove; 29. ​​through hole; 30. through hole; 31. guide rod. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0037] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0038] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They 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 specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] Reference Figure 1-11 A fixed-point area processing fixture for a columnar product based on a three-point contact centerless grinder comprises a grinder operating table 1 and a columnar workpiece 3. A protective box 2 is fixedly installed on the surface of the grinder operating table 1. A rotating member 4 is rotatably connected inside the protective box 2. The rotating member 4 is a cylindrical structure with round holes at both ends. A driving mechanism for driving the rotating member 4 to rotate is arranged inside the protective box 2. A connecting tube 8 is rotatably penetrated on the surface of the rotating member 4 at the position of the round holes at both ends. A connecting head 9 is fixedly installed on the end of the connecting tube 8. The columnar workpiece 3 penetrates the connecting tube 8 and the connecting head 9. Three clamping rods 12 are slidably penetrated on the surface of the connecting head 9. A movable ring 10 is sleeved on the surface of the connecting tube 8. Three second electric cylinders 17 are fixedly installed on the side wall of the connecting head 9. The output ports of the three second electric cylinders 17 are all fixedly connected to the movable ring 10. Three connecting rods 11 are rotatably connected on the surface of the movable ring 10. The three connecting rods 11 are respectively rotatably connected with the three clamping rods 12 Dynamic connection, the surface of the connecting tube 8 is provided with an auxiliary mechanism for assisting the movement of the columnar workpiece 3 and a linkage mechanism for pushing the columnar workpiece 3, the columnar workpiece 3 is inserted into the circular hole of the rotating part 4, and is fixed according to the length of the columnar workpiece 3 and the position to be processed. When fixing, the second electric cylinder 17 is directly started, and the second electric cylinder 17 drives the movable ring 10 to move in the direction away from the connecting head 9, thereby driving the connecting rod 11 to move, and the other end of the connecting rod 11 is rotatably connected to the clamping rod 12, and the clamping rod 12 and the connecting head 9 are slidably connected, so the movement of the connecting rod 11 can make the clamping rod 12 slide, and the three clamping rods 12 move synchronously toward the center of the connecting head 9, thereby clamping and fixing the columnar workpiece 3, after the columnar workpiece 3 is fixed, the driving mechanism can be used to drive the entire rotating part 4 to rotate in the protective box 2, thereby driving the columnar workpiece 3 to rotate synchronously, thereby facilitating processing.

[0040] Furthermore, the auxiliary mechanism includes a fixed ring 13, on the side wall of which three first electric cylinders 14 are fixedly installed, a connecting ring 15 is sleeved on the surface of the connecting tube 8, the output ports of the three first electric cylinders 14 are fixedly connected to the connecting ring 15, and three connecting rods 16 are fixedly installed on the side wall of the connecting ring 15. The surface of the connecting tube 8 is provided with three through holes 29, and the surfaces of the three through holes 29 are slidably connected with sliders 25, and the top of the slider 25 is provided with an inclined groove 28. The port of the slider 25 located inside the connecting tube 8 is evenly rotated and connected with a clamping wheel 26. In the process of processing the columnar workpiece 3, a milling cutter is generally required. The working state of the milling cutter and the grinder cooperate with each other, and there are two operating modes. The first is that the milling cutter does not move and the columnar workpiece 3 rotates to achieve processing. The second is that the columnar workpiece 3 does not move and the milling cutter rotates, and processing can also be achieved.For the second processing method, after processing one position of the columnar workpiece 3, the columnar workpiece 3 needs to be moved, so as to move another position of the columnar workpiece 3 to the processing position of the milling cutter. At this time, the columnar workpiece 3 needs to be moved, and in order to ensure that the milling cutter is in the same straight line as the previous processing, the columnar workpiece 3 needs to be moved horizontally and cannot be rotated. At this time, if the fastening of the columnar workpiece 3 is directly released and it is moved manually, the processing position will not be in the same straight line as the previous processing position, so the fixed-point area processing cannot be achieved. By setting an auxiliary mechanism, the first electric cylinder 14 is started, and the first electric cylinder 14 drives the connecting ring 15 to move toward the connecting head 9, thereby driving the three connecting rods 16 to move synchronously. The three connecting rods 16 will squeeze the inclined grooves 28 of the three sliders 25. After the three inclined grooves 28 are squeezed, the three sliders 25 will slide toward the inside of the connecting tube 8, and then the three sliders 25 will squeeze the columnar workpiece 3. The end of the slider 25 is provided with a clamping wheel 26, so the slider 25 contacts the columnar workpiece 3 by the clamping wheel 26. At this time, when the second electric cylinder 17 is started, the first electric cylinder 17 is started. The second electric cylinder 17 drives the movable ring 10 to move in the direction close to the connecting head 9, so that the connecting rod 11 drives the clamping rod 12 to move in the direction away from the columnar workpiece 3, thereby releasing the clamping rod 12 from the columnar workpiece 3. At this moment, the columnar workpiece 3 is supported by only three sets of clamping wheels 26, and the arrangement of each set of clamping wheels 26 is consistent with the length direction of the columnar workpiece 3. Therefore, the columnar workpiece 3 can be directly pushed to move along the rotation direction of the clamping wheels 26. When the columnar workpiece 3 has finished moving, the clamping rod 12 is used again to clamp and fix it, so as to facilitate processing. A traditional three-jaw chuck can clamp and fix shorter workpieces, and because the workpiece is abutted against the chuck, the workpiece will not move even if the end of the workpiece is processed. In the present application, the provided slider 25 can not only assist in clamping the workpiece so that the workpiece can be moved and guided, but also, for shorter workpieces, the slider 25 can be directly moved toward the center of the connecting tube 8. In this way, after the workpiece is inserted into the connecting tube 8 and clamped and fixed by the clamping rod 12, the slider 25 can also be used to abut the end of the workpiece, thereby improving functionality.

[0041] Furthermore, one end of the connecting rod 16 close to the slider 25 is rotatably connected to a roller 24, and a second spring 27 is fixedly installed on the top of the slider 25. The second spring 27 is fixedly connected to the connecting tube 8 at one end away from the slider 25. By arranging the second spring 27 on the slider 25, the slider 25 can be located away from the center of the connecting tube 8 under the action of the second spring 27 when not in use, so that the columnar workpiece 3 will not be blocked by the slider 25 during the insertion of the columnar workpiece 3. Therefore, the use of the slider 25 needs to be coordinated with the squeezing of the connecting rod 16. By arranging the roller 24, the connecting rod 16 can be in contact with the inclined groove 28 by using the roller 24, and then the rotation of the roller 24 can be used to reduce the friction during the pushing process.

[0042] Furthermore, the three connecting rods 16 all slide through the movable ring 10. The connecting rods 16 serve to push the slider 25 and also serve to limit the movable ring 10 so that the movable ring 10 can only move along the length direction of the connecting rods 16, thereby making the movable ring 10 work more stably.

[0043] Furthermore, the linkage mechanism includes two third electric cylinders 19, which are respectively fixedly mounted on both sides of the movable ring 10, and the output ports of the two third electric cylinders 19 are fixedly mounted with clamping blocks 18, and the sides of the two clamping blocks 18 that are away from each other are fixedly mounted with limiting rods 20, and the limiting rods 20 slide through the movable ring 10, and the sides of the two clamping blocks 18 that are close to each other are provided with "V"-shaped grooves, and the surface of the connecting tube 8 is provided with through holes 30 to achieve a state in which the clamping blocks 18 can extend into the interior of the connecting tube 8 to clamp the columnar workpiece 3, and the column When the workpiece 3 is processed, it needs to be moved. When the workpiece needs to be moved toward the outside of the rotating member 4, the slider 25 and the clamping wheel 26 in the auxiliary mechanism are first used to clamp the workpiece, and then the third electric cylinder 19 is started. The third electric cylinder 19 drives the clamping block 18 to clamp the workpiece, and then the second electric cylinder 17 is started. The second electric cylinder 17 drives the movable ring 10 to move toward the connecting head 9. When the movable ring 10 moves toward the connecting head 9, it will directly cause the clamping rod 12 to disengage from the clamping of the workpiece, and at the same time, it will drive the clamping block 18 to move synchronously. , and the clamping block 18 clamps the workpiece, and the workpiece is now clamped by the clamping wheel 26, and the clamping wheel 26 itself has a guiding function for the horizontal movement of the workpiece. Therefore, the movement of the movable ring 10 can directly drive the workpiece to move. After moving to the maximum distance, the third electric cylinder 19 drives the clamping block 18 to disengage from the clamping of the workpiece, and then the second electric cylinder 17 drives the movable ring 10 to move in the direction away from the connector 9. After moving, the above actions are repeated again, so that the movable ring 10 drives the workpiece to move outward, and this is repeated, and it can be automatically realized. There is no need for workers to manually push the workpiece to move it, and it can be used directly for longer and heavier workpieces, reducing the labor intensity of workers. When the workpiece needs to be pushed toward the inside of the rotating part 4, the movable ring 10 can be moved toward the connecting head 9 first, and then the clamping block 18 can be used to clamp the workpiece. After clamping, the movable ring 10 is used to move away from the connecting head 9, thereby driving the workpiece to move toward the inside of the rotating part 4. Therefore, the movable ring 10 cooperates with the clamping block 18 in the linkage mechanism to automatically realize the movement of the workpiece in two directions.

[0044] Furthermore, three guide rods 31 are fixedly installed on the surface of the connecting head 9, and the three clamping rods 12 slide through the three guide rods 31 respectively. The clamping rod 12 slides through the movement of the connecting rod 11, and the connecting rod 11 has a pulling force or a pushing force on the clamping rod 12. Therefore, the setting of the guide rods 31 can enhance the channel for the movement of the clamping rod 12, thereby enhancing the stability during movement.

[0045] Furthermore, the driving mechanism includes a motor 7, which is fixedly installed inside the protective box 2. A driving gear 6 is fixedly installed on the output shaft port of the motor 7, and a driven gear 5 is fixedly installed on the surface of the rotating part 4. The driving gear 6 and the driven gear 5 are meshed. After the columnar workpiece 3 is clamped and fixed, it is sometimes necessary to rotate it to facilitate its processing. By setting up a driving mechanism, the rotation of the entire rotating part 4 can be achieved. In specific operations, it is only necessary to start the motor 7. The motor 7 drives the driving gear 6 to rotate, the driving gear 6 drives the driven gear 5 to rotate, and the driven gear 5 drives the rotating part 4 to rotate, thereby driving the columnar workpiece 3 to rotate.

[0046] The two movable rods 21 are respectively meshed with the two sides of the push rod 23, and the three clamping rods 12 use their ends to clamp and fix the workpiece. By setting an upper push rod 23 and a movable rod 21 at the bottom end of each clamping rod 12, when the clamping rod 12 approaches the workpiece, the end of the push rod 23 contacts the workpiece first. As the clamping rod 12 continues to move, the push rod 23 moves, thereby driving the movable rods 21 on both sides to rotate until the movable rods 21 on both sides contact the workpiece. At this time, the push rod 23 and the two movable rods 21 are in a relatively balanced state, and as the clamping rod 12 moves, the three will not shake, and then the bottom end of each clamping rod 12 is in contact with the push rod 23 and the two movable rods 21, so that each clamping rod 12 is in three-point contact with the workpiece, thereby enhancing the clamping stability of the workpiece.

[0047] Furthermore, the movable rod 21 includes a clamping plate and a cylindrical gear, the cylindrical gear is welded to the top of the clamping plate, and the cylindrical gear is rotatably connected to the clamping rod 12, and the cylindrical gears in the movable rods 21 on both sides are respectively meshed with the two sides of the top rod 23.

[0048] Furthermore, a first spring 22 is fixedly installed on the top of the push rod 23, and one end of the first spring 22 away from the push rod 23 is fixedly connected to the clamping rod 12. By setting the first spring 22, when the push rod 23 no longer presses the workpiece, the push rod 23 will be pushed out by the first spring 22, so that the two movable rods 21 are in an open state, which is convenient for clamping next time and enhances practicality.

[0049] In summary, during use, the columnar workpiece 3 is inserted into the circular hole of the rotating member 4, and the columnar workpiece 3 is fixed according to its length and the position to be processed. When fixed, the second electric cylinder 17 is directly started, and the second electric cylinder 17 drives the movable ring 10 to move in a direction away from the connecting head 9, thereby driving the connecting rod 11 to move. The other end of the connecting rod 11 is rotatably connected to the clamping rod 12, and the clamping rod 12 and the connecting head 9 are slidably connected, so the movement of the connecting rod 11 can make the clamping rod 12 slide, and the three clamping rods 12 are synchronously moved toward the connecting head 9 The center position of the circle is moved, so as to clamp and fix the columnar workpiece 3. After the columnar workpiece 3 is fixed, the driving mechanism can be used to drive the entire rotating part 4 to rotate in the protective box 2, thereby driving the columnar workpiece 3 to rotate synchronously, thereby facilitating the processing. In the process of processing the columnar workpiece 3, a milling cutter is generally required. The working state of the milling cutter and the grinder cooperate with each other. There are two operating modes. The first is that the milling cutter does not move and the columnar workpiece 3 rotates to realize processing. The second is that the columnar workpiece 3 does not move and the milling cutter rotates, which can also realize processing. For the second processing method, after processing one position of the columnar workpiece 3, it is necessary to move the columnar workpiece 3, so as to move another position of the columnar workpiece 3 to the processing position of the milling cutter. At this time, the columnar workpiece 3 needs to be moved, and in order to ensure that the milling cutter is in the same straight line as the previous processing, the columnar workpiece 3 needs to be moved horizontally and cannot be rotated. At this time, if the fastening of the columnar workpiece 3 is directly released and it is moved manually, the processing position will not be in the same straight line as the previous processing position, so that the fixed-point area processing cannot be achieved. By setting an auxiliary mechanism, the first electric cylinder 14 is started, and the first electric cylinder 14 drives the connecting ring 15 to move toward the direction of the connecting head 9, thereby driving the three connecting rods 16 to move synchronously. The three connecting rods 16 will squeeze the inclined grooves 28 of the three sliders 25. After the three inclined grooves 28 are squeezed, the three sliders 25 will slide toward the inside of the connecting tube 8. Then, the three sliders 25 squeeze the columnar workpiece 3, and the end of the slider 25 is provided with a clamping wheel 26, so the slider 25 contacts the columnar workpiece 3 by means of the clamping wheel 26. At this time, when the second electric cylinder 17 is started, the second electric cylinder 17 drives the movable ring 10 to move in the direction close to the connecting head 9, so that the connecting rod 11 drives the clamping rod 12 to move in the direction away from the columnar workpiece 3, thereby releasing the clamping of the columnar workpiece 3 by the clamping rod 12. At this moment, the columnar workpiece 3 is supported by only three groups of clamping wheels 26, and the arrangement of each group of clamping wheels 26 is consistent with the length direction of the columnar workpiece 3. Therefore, the columnar workpiece 3 can be directly pushed to move along the rotation direction of the clamping wheel 26. When the columnar workpiece 3 finishes moving, it is clamped and fixed by the clamping rod 12 again, so as to facilitate processing. The traditional three-jaw chuck can clamp and fix shorter workpieces, and because the workpiece is abutted against the chuck,Therefore, even if the end of the workpiece is processed, the workpiece will not move. In the present application, the slider 25 provided can not only assist in clamping the workpiece so that the workpiece can be moved and guided, but also, for a shorter workpiece, the slider 25 can be directly moved toward the center of the connecting tube 8. In this way, after the workpiece is inserted into the connecting tube 8 and clamped and fixed by the clamping rod 12, the slider 25 can also be used to abut the end of the workpiece, thereby improving functionality. By providing a second spring 27 on the slider 25, the slider 25 can be located away from the center of the connecting tube 8 under the action of the second spring 27 when it is not needed, so that the columnar workpiece 3 will not be blocked by the slider 25 during the insertion of the columnar workpiece 3. The use of 25 needs to cooperate with the extrusion of the connecting rod 16. By setting the roller 24, the connecting rod 16 can be made to contact the inclined groove 28 by using the roller 24, and then the friction can be reduced by the rotation of the roller 24 during the pushing process. The connecting rod 16 serves the purpose of pushing the slider 25, and can also serve the purpose of limiting the movable ring 10, so that the movable ring 10 can only move along the length direction of the connecting rod 16, so that the work of the movable ring 10 is more stable. When the columnar workpiece 3 is processed, it needs to be moved. When the workpiece needs to be moved toward the outside of the rotating part 4, the slider 25 and the clamping wheel 26 in the auxiliary mechanism are first clamped, and then the third electric cylinder 19 is started. The third electric cylinder 19 drives the clamping block 18 to clamp the workpiece The movable ring 10 is clamped and then the second electric cylinder 17 is started. The second electric cylinder 17 drives the movable ring 10 to move toward the connecting head 9. When the movable ring 10 moves toward the connecting head 9, the clamp rod 12 will be directly disengaged from the clamping of the workpiece, and the clamp block 18 will be driven to move synchronously. The clamp block 18 will clamp the workpiece, and the workpiece is now in the clamping of the clamping wheel 26, and the clamping wheel 26 itself has a guiding function for the horizontal movement of the workpiece. Therefore, the movement of the movable ring 10 can directly drive the workpiece to move. After moving to the maximum distance, the third electric cylinder 19 drives the clamp block 18 to disengage from the clamping of the workpiece, and then the second electric cylinder 17 is used to drive the movable ring 10 to move in the direction away from the connecting head 9. After moving, the above actions are repeated again. , so that the movable ring 10 drives the workpiece to move outward, and this is repeated to automatically realize the movement of the workpiece without manual pushing by workers. Moreover, it can be directly used for longer and heavier workpieces, reducing the labor intensity of workers. When the workpiece needs to be pushed toward the inside of the rotating part 4, the movable ring 10 can be moved toward the connecting head 9 first, and then the clamping block 18 can be used to clamp the workpiece. After clamping, the movable ring 10 is used to move away from the connecting head 9, thereby driving the workpiece to move toward the inside of the rotating part 4. Therefore, the movable ring 10 cooperates with the clamping block 18 in the linkage mechanism to automatically realize the movement of the workpiece in two directions. The clamping rod 12 slides through the movement of the connecting rod 11, and the connecting rod 11 has a pulling force or a pushing force on the clamping rod 12.Therefore, the guide rod 31 is provided to increase the channel area for the movement of the clamping rod 12, thereby enhancing the stability during movement. After the columnar workpiece 3 is clamped and fixed, it is sometimes necessary to rotate it to facilitate its processing. The rotation of the entire rotating part 4 can be achieved by providing a driving mechanism. In specific operations, it is only necessary to start the motor 7, the motor 7 drives the active gear 6 to rotate, the active gear 6 drives the driven gear 5 to rotate, and the driven gear 5 drives the rotating part 4 to rotate, thereby driving the columnar workpiece 3 to rotate. The three clamping rods 12 use their ends to clamp and fix the workpiece. By providing an upper push rod 23 and a movable rod 21 at the bottom end of each clamping rod 12, when the clamping rod 12 approaches the workpiece, first the end of the push rod 23 is in contact with the workpiece As the clamp rod 12 continues to move, the push rod 23 will move, thereby driving the movable rods 21 on both sides to rotate, until the movable rods 21 on both sides are in contact with the workpiece. At this time, the push rod 23 and the two movable rods 21 are in a relatively balanced state, and as the clamp rod 12 moves, the three will not shake, and then the bottom end of each clamp rod 12 is in contact with the push rod 23 and the two movable rods 21, so that each clamp rod 12 is in three-point contact with the workpiece, and the clamping stability of the workpiece is enhanced. By setting the first spring 22, when the push rod 23 no longer squeezes the workpiece, the push rod 23 will be pushed out by the first spring 22, so that the two movable rods 21 are in an open state, which is convenient for clamping next time and enhances practicality.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A fixture for processing a fixed-point area of ​​a columnar product based on a three-point contact centerless grinder, characterized in that: The invention comprises a grinding machine operating table (1) and a columnar workpiece (3), wherein a protective box (2) is fixedly mounted on the surface of the grinding machine operating table (1), a rotating member (4) is rotatably connected inside the protective box (2), the rotating member (4) is a cylindrical structure with circular holes at both ends, a driving mechanism for driving the rotating member (4) to rotate is arranged inside the protective box (2), a connecting tube (8) is rotatably penetrated through the surface of the rotating member (4) at the positions of the circular holes at both ends, a connecting head (9) is fixedly mounted on the end of the connecting tube (8), the columnar workpiece (3) penetrates the connecting tube (8) and the connecting head (9), three clamping rods (12) are slidably penetrated through the surface of the connecting head (9), and a movable ring (10) is sleeved on the surface of the connecting tube (8) The side wall of the connecting head (9) is fixedly mounted with three second electric cylinders (17), the output ports of the three second electric cylinders (17) are fixedly connected to the movable ring (10), the surface of the movable ring (10) is rotatably connected with three connecting rods (11), the three connecting rods (11) are rotatably connected with three clamping rods (12) respectively, the surface of the connecting tube (8) is provided with an auxiliary mechanism for assisting the movement of the columnar workpiece (3) and a linkage mechanism for pushing the columnar workpiece (3), the auxiliary mechanism comprises a fixed ring (13), the side wall of the fixed ring (13) is fixedly mounted with three first electric cylinders (14), the surface of the connecting tube (8) is sleeved with a connecting ring (15), the three first electric cylinders The output ports of the connecting ring (14) are fixedly connected to the connecting ring (15), the side wall of the connecting ring (15) is fixedly mounted with three connecting rods (16), the surface of the connecting tube (8) is provided with three through holes (29), the surfaces of the three through holes (29) are slidably connected with sliders (25), the top of the slider (25) is provided with an inclined groove (28), the port of the slider (25) located inside the connecting tube (8) is evenly rotatably connected with a clamping wheel (26), the end of the connecting rod (16) close to the slider (25) is rotatably connected with a roller (24), the top of the slider (25) is fixedly mounted with a second spring (27), the end of the second spring (27) away from the slider (25) is fixedly connected to the connecting tube (8). The three connecting rods (16) are all slidably passed through the movable ring (10), and the linkage mechanism includes two third electric cylinders (19). The two third electric cylinders (19) are respectively fixedly mounted on both sides of the movable ring (10), and the output ports of the two third electric cylinders (19) are both fixedly mounted with clamping blocks (18). The two clamping blocks (18) are both fixedly mounted with limiting rods (20) on the sides away from each other, and the limiting rods (20) are slidably passed through the movable ring (10). The two clamping blocks (18) are both provided with "V"-shaped grooves on the sides close to each other. The surface of the connecting tube (8) is provided with a through hole (30) so that the clamping blocks (18) can extend into the interior of the connecting tube (8) to clamp the columnar workpiece (3).Three guide rods (31) are fixedly mounted on the surface of the connector (9), the three clamping rods (12) slide through the three guide rods (31) respectively, the bottom end of the clamping rod (12) is slidably inserted with a push rod (23), the bottom end of the clamping rod (12) is located on both sides of the push rod (23) and is rotatably connected to a movable rod (21), both sides of the push rod (23) are provided with teeth, and the two movable rods (21) are respectively meshed with the two sides of the push rod (23).

2. According to claim 1, a cylindrical product fixed-point area processing fixture for a three-point contact centerless grinder is characterized in that: The driving mechanism comprises a motor (7), the motor (7) being fixedly mounted inside the protective box (2), a driving gear (6) being fixedly mounted on an output shaft port of the motor (7), a driven gear (5) being fixedly mounted on a surface of the rotating member (4), and the driving gear (6) and the driven gear (5) being meshed.

3. According to claim 1, a cylindrical product fixed-point area processing fixture for a three-point contact centerless grinder is characterized in that: The movable rod (21) comprises a clamping plate and a cylindrical gear, the cylindrical gear is welded to the top of the clamping plate, and the cylindrical gear is rotatably connected to the clamping rod (12), and the cylindrical gears in the movable rods (21) on both sides are respectively meshed with the two sides of the top rod (23).

4. The fixture for processing a fixed-point area of ​​a columnar product based on a three-point contact centerless grinder according to claim 1 is characterized in that: A first spring (22) is fixedly mounted on the top of the push rod (23); one end of the first spring (22) away from the push rod (23) is fixedly connected to the clamping rod (12).

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