High-precision hollow pin grinding machine

Abstract

The application provides a high-precision hollow pin grinding machine, and relates to the technical field of hollow pin processing. The machine comprises a machine base, two machine supports vertically arranged above the machine base, a material rotating driving element fixedly connected to the front surface of the front machine support through bolts, and a hollow pin rotating disc rotatably connected between the two machine supports through bearings. The machine has the functions of automatic feeding and unloading, realizes continuous grinding, and can continuously feed multiple hollow pins into the machine. The machine can effectively reduce the time waste caused by the traditional single-piece assembly and disassembly process, and solve the problem that the existing hollow pin end face grinding machine relies on manual or mechanical hand to clamp and position single pieces, and then disassembles and removes the single pieces after the grinding process is completed. The single-piece serial processing mode causes repeated clamping and disassembly operations during batch processing, and the processing process is difficult to run continuously, which restricts the improvement of production efficiency.

Description

Technical Field

[0001] This invention relates to the field of hollow pin processing technology, and in particular to a high-precision hollow pin grinding machine. Background Technology

[0002] Hollow pins are mechanical connectors with a hollow structure, typically manufactured using rolling or stamping processes. During manufacturing, burrs and sharp edges are easily generated on both ends. If these burrs are not treated, they will scratch the inner wall or mating surface of mechanical parts when pressed into the mating hole, affecting the smoothness of assembly, damaging critical moving parts surfaces, and reducing the overall assembly accuracy and reliability of the machine. Therefore, grinding the two ends of hollow pins is an indispensable finishing process. Through fine chamfering or polishing, the sharp edges at the ends can be completely eliminated, forming a smooth and flat transition surface, avoiding scratching problems during assembly.

[0003] Existing hollow pin end face grinding machines generally rely on manual or robotic arms for single-piece clamping and positioning during operation. After the grinding process is completed, the parts are disassembled and removed. This single-piece serial processing method requires repeated clamping and disassembly operations during batch processing, which increases labor intensity and time consumption. The processing process is difficult to run continuously, which restricts the improvement of production efficiency. Summary of the Invention

[0004] This invention provides a high-precision hollow pin grinding machine to solve the problem that existing hollow pin end face grinding machines generally rely on manual or robotic arms for single-piece clamping and positioning during operation, and then disassemble and remove the pin after the grinding process is completed. This single-piece serial processing method leads to repeated clamping and disassembly operations during batch processing, which increases labor intensity and time consumption, makes it difficult to operate the processing continuously, and restricts the improvement of production efficiency.

[0005] This invention provides a high-precision hollow pin grinding machine, specifically comprising: a machine base; two machine supports vertically mounted above the machine base; a material transfer drive component is bolted to the front surface of the front machine support; a hollow pin rotating disk is rotatably connected between the two machine supports via bearings; the front end of the rotating shaft of the hollow pin rotating disk is fixedly connected to the rotating shaft of the material transfer drive component; a support plate is fixedly connected to the top of the machine support; a hollow pin loading track and a hollow pin unloading track are fixedly connected below the support plate via supports; the hollow pin loading track is inclined to the right of the hollow pin rotating disk, and a 1-2mm gap is provided between the left end of the hollow pin loading track and the hollow pin rotating disk; the hollow pin unloading track is inclined to the left of the hollow pin rotating disk; and the hollow pin... The right end of the unloading roller is separated from the hollow pin rotary table by a 1-2mm gap. Both the hollow pin loading roller and the hollow pin unloading roller are inclined with the left side lower than the right side. The machine tool support has a rectangular groove structure support adjustment slot at its center. A tensioning push plate is slidably connected inside the support adjustment slot. Four tensioning top springs are fixedly connected between the tensioning push plate and the support adjustment slot. A grinding drive is fixedly connected to the tensioning push plate. The rotating shaft of the grinding drive is fixedly connected to a hollow pin end face grinding disc. A grinding disc wedge is provided at the edge of the abrasive surface of the hollow pin end face grinding disc. Six hollow pin insertion holes are evenly distributed on the outer edge of the hollow pin rotary table. A pin locking frame is provided below the support connecting plate. A limit locking band is movably connected below the pin locking frame. The limit locking band is movably connected to the hollow pin rotary table.

[0006] Furthermore, the upper and lower surfaces of the bracket adjustment groove are provided with guide protrusions, and the upper and lower surfaces of the bracket adjustment groove are provided with limiting groove edges near the hollow pin disc. The upper and lower surfaces of the tensioning push plate are respectively provided with a push plate slide groove, which is slidably connected to the guide protrusions. The wall of the bracket adjustment groove is provided with a drive component insertion port.

[0007] Furthermore, the outer circular surface of the hollow pin disc is recessed with a limiting groove.

[0008] Furthermore, the two edges of the hollow pin feeding raceway are bent upward to form raceway side edges. A limiting arc plate is fixedly connected to the left end of the raceway side edge. The distance between the two limiting arc plates is equal to the distance between the two raceway side edges of the hollow pin feeding raceway. The two limiting arc plates are located in front of and behind the hollow pin rotating disc, respectively.

[0009] Furthermore, two locking belt wheels are rotatably connected to the lower part of the pin lock frame, and the limiting lock belt is movably connected to the outside of the two locking belt wheels. The outer surface of the lower half of the limiting lock belt is tightly fitted into the groove surface of the limiting belt.

[0010] Furthermore, two lock frame guide rods are vertically welded above the pin lock frame. The lock frame guide rods are slidably connected to the drive component socket. A lock frame top spring is sleeved on the lock frame guide rod. The lower end of the lock frame top spring is fixedly connected to the pin lock frame, and the upper end of the lock frame top spring is fixedly connected to the bracket connecting plate.

[0011] Furthermore, an airflow nozzle is provided between the hollow pin rotary disk and the two grinding drive components, with the opening of the airflow nozzle facing downwards.

[0012] Furthermore, the lower opening of the airflow nozzle has an arc-shaped structure, and the two airflow nozzles are connected by an air supply pipe, with a compressed air interface provided above the air supply pipe.

[0013] Furthermore, a dust collection box is fixedly connected to the upper surface of the machine tool base, an exhaust filter plate is covered above the dust collection box, and two exhaust pipes are fixedly connected above the dust collection box, with the two exhaust pipes located in front of and behind the hollow pin rotary table, respectively.

[0014] Furthermore, the top of the exhaust pipe is provided with a dust collection arc opening with an arc structure, the dust collection arc opening is located below the hollow pin end face grinding disc, and the lower end of the exhaust pipe is connected to the interior of the dust collection box.

[0015] This invention provides a high-precision hollow pin grinding machine tool, which has the following beneficial effects:

[0016] In the hollow pin grinding machine of this invention, a disc-shaped hollow pin rotary table, together with hollow pin loading and unloading rollers, enables continuous automatic loading and unloading of hollow pins. The hollow pin loading and unloading rollers, while serving as material conveying channels, can also act as temporary storage areas for multiple hollow pins. Combined with the automatic loading and unloading functions, continuous grinding processing is achieved. Multiple hollow pins can be loaded at once and automatically and continuously enter the machine tool sequentially, allowing the processing to run smoothly and effectively reducing the time wasted by traditional single-piece assembly and disassembly processes, thus significantly improving production efficiency.

[0017] Furthermore, a pin locking frame is provided above the hollow pin rotating disc, and a limit locking band is installed below the pin locking frame via a locking band wheel. Under normal conditions, the limit locking band is tightly engaged with the limit band groove by the push of the locking frame top spring. As the hollow pin rotating disc rotates, the limit locking band moves with the hollow pin rotating disc under the action of friction. The hollow pin located inside the hollow pin socket contacts the limit locking band as the hollow pin rotating disc rotates and is pressed and fixed by the limit locking band, realizing the automatic locking of the hollow pin and avoiding vibration during the hollow pin grinding process. After grinding, the hollow pin separates from the limit locking band again as the hollow pin rotating disc rotates, and the contact control pin is fixed. Compared with existing grinding machine tools, this application has an automatic locking function for hollow pins, which does not require manual or robotic operation, nor does it require additional locking and driving mechanisms. It realizes the function of fixed-point automatic locking and fixed-point automatic unlocking of hollow pins, reducing the intensity of manual labor.

[0018] Furthermore, it features simultaneous grinding of both ends of hollow pins. Compared to existing machine tools, it eliminates the need for multiple assembly and disassembly to switch grinding surfaces, making it suitable for hollow pins requiring double-end grinding. As the rotary table rotates, the hollow pin passes through the end-face grinding area at a uniform speed, first contacting the grinding disc wedge edge. The wedge surface then pushes the grinding disc outwards, ensuring full contact between the pin end face and the high-speed rotating grinding surface. Under the continuous pressure of the tension spring, stable contact and uniform grinding are guaranteed during the grinding process, significantly improving the quality and consistency of the end-face machining.

[0019] Furthermore, the integrated airflow nozzles and dust collection box form an effective cooling and waste disposal mechanism. Compressed air is sprayed downwards through the airflow nozzles, cooling the grinding surface and blowing away processing waste, which then enters the dust collection box through the dust collection arc and exhaust pipe. The air is discharged through the filter plate, while the waste is trapped and collected, maintaining a clean processing environment, extending equipment life, and possessing excellent environmental protection and practical performance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0021] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0022] In the attached diagram:

[0023] Figure 1 A schematic diagram of the overall structure of this application is shown;

[0024] Figure 2 A schematic diagram of the front view structure of this application is shown;

[0025] Figure 3 A schematic diagram of the left-side structure of this application is shown;

[0026] Figure 4 A schematic diagram of the hollow pin rotary disk of this application is shown;

[0027] Figure 5 This diagram shows the structure of the hollow pin disc when it is separated from the pin lock frame.

[0028] Figure 6 A schematic diagram of the airflow nozzle of this application is shown;

[0029] Figure 7 This shows a structural schematic diagram of the bracket adjustment groove in this application when disassembled;

[0030] Figure 8 This paper shows a schematic diagram of the structure of the tensioning pusher plate in the separated state.

[0031] Figure 9 A schematic diagram of the dust collection box of this application is shown;

[0032] Figure 10 This application shows Figure 4 A magnified structural diagram of point A in the middle;

[0033] Figure 11 This application shows Figure 4 A magnified structural diagram of point B in the middle section;

[0034] Figure 12 This application shows Figure 8 A magnified structural diagram of point C in the middle.

[0035] Figure label:

[0036] 1. Machine tool base; 2. Machine tool bracket; 201. Bracket adjustment groove; 202. Limiting groove edge; 203. Guide convex plate; 204. Drive component socket; 205. Bracket connecting plate; 3. Tensioning push plate; 301. Push plate slide groove; 302. Tensioning top spring; 4. Grinding drive component; 401. Hollow pin end face grinding disc; 402. Grinding disc wedge edge; 5. Material transfer drive component; 6. Hollow pin swivel; 601. Hollow pin socket; 602. 7. Limiting groove; 8. Hollow pin feeding roller; 9. Limiting arc plate; 10. Hollow pin unloading roller; 11. Pin lock frame; 12. Lock frame guide rod; 13. Lock frame top spring; 14. Lock belt wheel; 15. Limiting lock belt; 16. Airflow nozzle; 17. Air supply pipe; 18. Compressed air interface; 19. Dust collection box; 10. Exhaust filter plate; 11. Exhaust pipe; 12. Dust collection arc. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1: Please refer to Figures 1 to 12 :

[0039] This invention proposes a high-precision hollow pin grinding machine, comprising: a machine base 1, two machine support brackets 2 vertically mounted above the machine base 1, a material transfer drive component 5 fixedly connected to the front surface of the front machine support bracket 2 by bolts, a hollow pin rotating disk 6 rotatably connected between the two machine support brackets 2 by bearings, the front end of the rotating shaft of the hollow pin rotating disk 6 being fixedly connected to the rotating shaft of the material transfer drive component 5, a support connecting plate 205 fixedly connected to the top of the machine support bracket 2, and a hollow pin feeding roller track fixedly connected below the support connecting plate 205 by a bracket. Hollow pin loading roller 7 and hollow pin unloading roller 8 are inclined and located to the right of hollow pin rotating disc 6. The left end of hollow pin loading roller 7 has a 1-2mm gap from hollow pin rotating disc 6. Hollow pin unloading roller 8 is inclined and located to the left of hollow pin rotating disc 6. The right end of hollow pin unloading roller 8 has a 1-2mm gap from hollow pin rotating disc 6. Both hollow pin loading roller 7 and hollow pin unloading roller 8 are inclined with the left side lower than the right side. Six hollow pin insertion holes 601 are evenly distributed along the outer edge of hollow pin rotating disc 6. Support connecting plate 2. Below 05, a pin locking frame 9 is provided. A limit locking band 904 is movably connected below the pin locking frame 9. The limit locking band 904 is movably connected to the hollow pin rotating disc 6. When the hollow pin rotating disc 6 rotates counterclockwise, the hollow pins located in the hollow pin feeding track 7 roll into the hollow pin insertion slot 601 as the hollow pin rotating disc 6 rotates and the hollow pin insertion slot 601 rises, thus achieving automatic feeding. Furthermore, as the hollow pin rotating disc 6 rotates, the hollow pin insertion slot 601, which stores hollow pins, rolls into the hollow pin insertion slot 601, achieving automatic feeding. 01 After the end face grinding is completed and the hollow pin turntable 6 is adjusted to be above the hollow pin unloading raceway 8 as it rotates, the hollow pins inside the hollow pin insert 601 roll into the hollow pin unloading raceway 8 as the opening of the hollow pin insert 601 rotates downwards, thus realizing the automatic unloading of the hollow pins. The hollow pin loading raceway 7 and the hollow pin unloading raceway 8 can serve as material conveying channels and also as temporary storage areas for hollow pins, storing multiple hollow pins. With the automatic loading and unloading functions, the continuous grinding processing function is realized.

[0040] In this embodiment, the machine tool support 2 has a rectangular slot adjustment groove 201 at its center. A tensioning push plate 3 is slidably connected inside the support adjustment groove 201. Four tensioning top springs 302 are fixedly connected between the tensioning push plate 3 and the support adjustment groove 201. A grinding drive component 4 is fixedly connected to the tensioning push plate 3. A hollow pin end face grinding disc 401 is fixedly connected to the rotating shaft of the grinding drive component 4. A grinding disc wedge 402 is provided at the edge of the abrasive surface of the hollow pin end face grinding disc 401. Guide protrusions 203 are provided on both the upper and lower groove surfaces of the support adjustment groove 201. Limiting groove edges 202 are provided near the edges of the hollow pin disc 6 on the upper and lower groove surfaces of the support adjustment groove 201. The upper end of the tensioning push plate 3... A push plate groove 301 is provided on the top and bottom surfaces respectively. The push plate groove 301 is slidably connected to the guide protrusion 203. The support adjustment groove 201 has a drive component insertion port 204 through the groove wall. The distance between the two hollow pin end face grinding discs 401 is 1-2mm less than the distance between the two ends of the hollow pin being ground. When the hollow pin passes between the two hollow pin end face grinding discs 401 through the movement of the hollow pin rotary disc 6, it first contacts the grinding disc wedge edge 402. Under the action of the inclined surface of the grinding disc wedge edge 402, the hollow pin end face grinding disc 401 is pushed outward. Under the action of the tension top spring 302, the tension push plate 3, the grinding drive component 4 and the hollow pin end face grinding disc 401 are pushed towards the hollow pin end face to maintain the grinding effect on the hollow pin.

[0041] In this embodiment, the outer circumferential surface of the hollow pin disc 6 is recessed with a limiting groove 602. Two locking rollers 903 are rotatably connected to the lower part of the pin lock frame 9. A limiting locking band 904 is movably connected to the two locking rollers 903. The lower half of the outer surface of the limiting locking band 904 is tightly fitted into the groove surface of the limiting groove 602. The limiting groove 602 limits the limiting locking band 904, preventing it from deviating during operation and disengaging from the locking rollers 903. Two lock frame guide rods 901 are vertically welded to the upper part of the pin lock frame 9. The lock frame guide rods 901 are slidably connected to the drive component insertion port 204. A lock frame top spring 902 is sleeved on the lock frame guide rods 901. The lower end of the lock frame top spring 902 is fixedly connected to the pin lock frame 9, and the upper end of the lock frame top spring 902 is fixedly connected to the bracket connecting plate 205. The lower part of the pin lock frame 9 is connected to the locking rollers 903. The device is equipped with a limit locking band 904. Under normal conditions, the limit locking band 904 is tightly engaged with the limit band groove 602 by the push of the lock frame top spring 902. As the hollow pin rotary table 6 rotates, the limit locking band 904 moves with the hollow pin rotary table 6 under the action of friction. The hollow pin located inside the hollow pin socket 601 contacts the limit locking band 904 as the hollow pin rotary table 6 rotates and is pressed and fixed by the limit locking band 904, realizing the automatic locking of the hollow pin and avoiding vibration during the grinding process. After grinding, the hollow pin separates from the limit locking band 904 again as the hollow pin rotary table 6 rotates, and the contact control pin is fixed. Compared with existing grinding machines, this application has an automatic locking function for hollow pins, which does not require manual or robotic operation, nor does it require additional locking and driving mechanisms. It realizes the function of fixed-point automatic locking and fixed-point automatic unlocking of hollow pins.

[0042] In this embodiment, the two edges of the hollow pin feeding raceway 7 are bent upward to form raceway side edges. The left end of the raceway side edge is fixedly connected to a limiting arc plate 701. The distance between the two limiting arc plates 701 is equal to the distance between the two raceway side edges of the hollow pin feeding raceway 7. The distance between the two limiting arc plates 701 is 1-2 mm greater than the distance between the two end faces of the hollow pin being ground. The two limiting arc plates 701 are located in front of and behind the hollow pin rotating disk 6, respectively. By setting the limiting arc plates 701, the hollow pins that enter the hollow pin insertion port 601 but have not contacted the limiting locking band 904 are limited, so as to prevent the hollow pins from shifting before they are fixed by the limiting locking band 904.

[0043] In Example 2, based on Example 1, an airflow nozzle 10 is provided between the hollow pin rotary table 6 and the two grinding drive components 4. The opening of the airflow nozzle 10 faces downward, and the lower opening of the airflow nozzle 10 has an arc-shaped structure. The two airflow nozzles 10 are connected through an air supply pipe 1001. A compressed air interface 1002 is provided above the air supply pipe 1001. A dust collection box 11 is fixedly connected to the upper surface of the machine tool base 1. An exhaust filter plate 1101 is covered on top of the dust collection box 11. Two exhaust pipes 1102 are fixedly connected to the top of the dust collection box 11. The two exhaust pipes 1102 are located in front of and behind the hollow pin rotary table 6, respectively. The top of the exhaust pipe 1102 has a dust collection arc vent 1103 with an arc-shaped opening. 1103 is located below the hollow pin end face grinding disc 401, and the lower end of the exhaust pipe 1102 is connected to the inside of the dust collection box 11. When the grinding machine is running, the compressed air interface 1002 is connected to the compressed air pipeline in the workshop, and compressed air is introduced into the airflow nozzle 10. The compressed air is sprayed downward through the airflow nozzle 10, and the airflow cools the grinding surface. At the same time, it can carry away the waste generated during the grinding process and enter the dust collection arc 1103. It is transported to the inside of the dust collection box 11 through the exhaust pipe 1102. The air entering the dust collection box 11 passes through the exhaust filter plate 1101 and is discharged. The waste in the airflow is intercepted and collected into the dust collection box 11, which prevents metal waste from leaking and splashing. It realizes the function of auxiliary cooling and automatically cleans and collects the waste.

[0044] The working principle of this embodiment is as follows: First, the material transfer drive 5 is turned on, which drives the hollow pin rotating disk 6 to rotate slowly counterclockwise. The compressed air interface 1002 is connected to the compressed air pipeline. The grinding drive 4 is turned on, and the hollow pins with burrs on the end face are arranged and placed inside the hollow pin loading raceway 7. Under the action of the inclined surface of the hollow pin loading raceway 7, the hollow pins roll to the left and come into contact with the outer surface of the hollow pin rotating disk 6. When the hollow pin insertion port 601 rotates counterclockwise with the hollow pin rotating disk 6, When connected to the hollow pin feeding roller 7, the hollow pins located in the hollow pin feeding roller 7 roll into the hollow pin insertion port 601, realizing the automatic feeding function. As the hollow pin rotary disc 6 rotates, the hollow pins located inside the hollow pin insertion port 601 come into contact with the limiting lock band 904 and are pressed and fixed by the limiting lock band 904. During the process of the hollow pin slowly passing through the hollow pin end face grinding disc 401 at a uniform speed with the rotation of the hollow pin rotary disc 6, the hollow pin first comes into contact with the grinding disc. The wedge edge 402 contacts the hollow pin end face grinding disc 401, and the pressure from the wedge surface pushes the disc outward. After entering the hollow pin end face grinding disc 401, the hollow pin end face is in contact with the abrasive surface of the hollow pin end face grinding disc 401. The hollow pin end face grinding disc 401 rotates at high speed under the drive of the grinding drive component 4, realizing the grinding of both ends of the hollow pin. At the same time, compressed air is sprayed downward through the airflow nozzle 10, and the airflow cools the grinding surface. It can also carry away the waste generated during the grinding process and enter the dust collection arc. 1103, the air is transported to the dust collection box 11 through the exhaust pipe 1102. The air entering the dust collection box 11 is discharged through the exhaust filter plate 1101, and the waste in the airflow is intercepted and collected into the dust collection box 11. After the hollow pin is polished, it separates from the limit lock band 904 as the hollow pin disc 6 rotates. When the opening of the hollow pin insertion port 601 rotates to face downwards, the hollow pin rolls into the hollow pin unloading track 8 for automatic discharge. This completes the entire process of polishing the double end face of the hollow pin.

[0045] The following points should be noted in this article:

[0046] 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0047] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0048] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A high-precision hollow pin grinding machine tool, comprising: A machine tool base (1), two machine tool supports (2) vertically arranged above the machine tool base (1), a material transfer drive (5) is fixedly connected to the front surface of the front machine tool support (2) by bolts, characterized in that a hollow pin turntable (6) is rotatably connected between the two machine tool supports (2) by bearings, the front end of the rotating shaft of the hollow pin turntable (6) is fixedly connected to the rotating shaft of the material transfer drive (5), a support plate (205) is fixedly connected to the top of the machine tool support (2), and a hollow pin loading roller is fixedly connected to the bottom of the support plate (205) by a support. 7) Hollow pin unloading raceway (8), the hollow pin loading raceway (7) is inclinedly arranged to the right of the hollow pin rotary table (6), the left end of the hollow pin loading raceway (7) and the hollow pin rotary table (6) have a gap of 1-2mm, the hollow pin unloading raceway (8) is inclinedly arranged to the left of the hollow pin rotary table (6), the right end of the hollow pin unloading raceway (8) and the hollow pin rotary table (6) have a gap of 1-2mm, the hollow pin loading raceway (7) and the hollow pin unloading raceway (8) are both inclined to the left and right, the machine tool support (2) has a cuboid groove in the center. The support adjustment groove (201) of the body structure is slidably connected to a tensioning push plate (3). Four tensioning top springs (302) are fixedly connected between the tensioning push plate (3) and the support adjustment groove (201). A grinding drive (4) is fixedly connected to the tensioning push plate (3). A hollow pin end face grinding disc (401) is fixedly connected to the rotating shaft of the grinding drive (4). A grinding disc wedge (402) is provided at the edge of the abrasive surface of the hollow pin end face grinding disc (401). Six hollow pin inserts are evenly distributed on the outer edge of the hollow pin rotating disc (6). Below the bracket connecting plate (205), there is a pin lock frame (9). Two locking belt wheels (903) are rotatably connected below the pin lock frame (9). The two locking belt wheels (903) are connected to a limit lock belt (904). Two lock frame guide rods (901) are vertically welded above the pin lock frame (9). Lock frame top springs (902) are sleeved on the lock frame guide rods (901). The lower end of the lock frame top springs (902) is fixedly connected to the pin lock frame (9), and the upper end of the lock frame top springs (902) is fixedly connected to the bracket connecting plate (205).

2. The high-precision hollow pin grinding machine tool according to claim 1, characterized in that, The upper and lower groove surfaces of the bracket adjustment groove (201) are provided with guide protrusions (203). The upper and lower groove surfaces of the bracket adjustment groove (201) near the edge of the hollow pin disc (6) are provided with limiting groove edges (202). The upper and lower end surfaces of the tensioning push plate (3) are respectively provided with a push plate slide groove (301). The push plate slide groove (301) is slidably connected to the guide protrusions (203). The groove wall of the bracket adjustment groove (201) is provided with a drive component insertion port (204).

3. The high-precision hollow pin grinding machine tool according to claim 1, characterized in that, The outer circular surface of the hollow pin disc (6) is provided with a limiting groove (602).

4. A high-precision hollow pin grinding machine tool according to claim 1, characterized in that, The hollow pin feeding raceway (7) has two edges bent upwards to form raceway side edges. The left end of the raceway side edge is fixedly connected to a limiting arc plate (701). The distance between the two limiting arc plates (701) is equal to the distance between the two raceway side edges of the hollow pin feeding raceway (7). The two limiting arc plates (701) are located in front of and behind the hollow pin spinning disc (6), respectively.

5. A high-precision hollow pin grinding machine tool according to claim 3, characterized in that, The lower half of the outer surface of the limiting lock band (904) is tightly fitted into the groove surface of the limiting band groove (602).

6. A high-precision hollow pin grinding machine tool according to claim 1, characterized in that, An airflow nozzle (10) is provided between the hollow pin rotary disc (6) and the two grinding drive components (4), with the opening of the airflow nozzle (10) facing downwards.

7. A high-precision hollow pin grinding machine tool according to claim 6, characterized in that, The lower opening of the airflow nozzle (10) is arc-shaped, and the two airflow nozzles (10) are connected by an air supply pipe (1001). A compressed air interface (1002) is provided above the air supply pipe (1001).

8. A high-precision hollow pin grinding machine tool according to claim 7, characterized in that, A dust collection box (11) is fixedly connected to the upper surface of the machine tool base (1). An exhaust filter plate (1101) is covered above the dust collection box (11). Two exhaust pipes (1102) are fixedly connected above the dust collection box (11). The two exhaust pipes (1102) are located in front of and behind the hollow pin rotary table (6), respectively.

9. A high-precision hollow pin grinding machine tool according to claim 8, characterized in that, The top of the exhaust pipe (1102) is provided with a dust collection arc mouth (1103) with an arc-shaped opening. The dust collection arc mouth (1103) is located below the hollow pin end face grinding disc (401). The lower end of the exhaust pipe (1102) is connected to the inside of the dust collection box (11).

Images