A centerless grinding machine and a screw assembly automatic feeding processing method

Abstract

This invention relates to the field of centerless grinding technology and discloses an automatic feeding and machining method for a centerless grinding machine and a screw assembly. A single material is clamped and fixed in the middle by a clamping pad and conveyed to the machining position. Since the heavier end of the material is heavier, after being lifted by the clamping pad, the material rotates with the clamping pad, causing the heavier end to face downwards. When conveyed to the machining position, the heavier end is further away from the clamping pad than the lighter end, allowing it to be placed in the machining position. A limiting inclined rod restricts the material at the machining position, ensuring the material is horizontally positioned. The grinding wheel and guide wheel then process the material. When machining the screw assembly, the centerless grinding machine automatically corrects the machining position of the screw assembly and automatically calibrates its level, thereby improving the machining quality and processing efficiency of the centerless grinding machine.

Description

Technical Field

[0001] This invention relates to the field of centerless grinding technology, specifically to an automatic feeding method for a centerless grinding machine and screw assembly. Background Technology

[0002] A centerless grinder is a type of grinder that does not require workpiece axis positioning for grinding. It mainly consists of three mechanisms: a grinding wheel, an adjusting wheel, and a workpiece support. The grinding wheel is responsible for the actual grinding work, the adjusting wheel controls the rotation of the workpiece and the feed rate, and the workpiece support supports the workpiece during grinding. These three components can be combined in several ways, except when grinding is stopped, but the principle is the same.

[0003] In existing centerless grinders, such as the Chinese patent application CN119794982A, a dynamically extended inner shaft, a media cylinder, a slider vertical shaft, and a swing control mechanism work together to automatically extend the dynamically extended inner shaft during the lifting and return of the cylinder liner. This extends the length of the return lifting shaft, keeping the return position away from the grinding wheel and guide wheel, thus improving safety. Furthermore, during placement and processing, the dynamically extended inner shaft retracts, resulting in a shorter overall length of the return lifting shaft and avoiding interference with the cylinder liner's placement and processing. The electromagnet module, contact springs, and spiral wires allow for power control of the electromagnet module without affecting the extension and retraction of the dynamically extended inner shaft. During the cylinder liner's slide, when it moves near the electromagnet module, the module generates magnetic restraint, achieving a deceleration effect and facilitating the operator's handling of the cylinder liner.

[0004] However, the following problems still exist: When machining the screw assembly, because the screw assembly has an integrated assembly part, the screw assembly cannot be directly fed in for machining like a round rod. This makes it time-consuming for the device to correct the machining position of the screw assembly, resulting in low processing efficiency of the device. Using manual-assisted semi-automatic machining also leads to a decrease in the processing efficiency of the device. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an automatic feeding and processing method for a centerless grinder and a screw assembly. This method automatically corrects the machining position of the screw assembly during processing and automatically calibrates the level of the screw assembly, thereby improving the machining quality and processing efficiency of the centerless grinder. It solves the problem that when machining a screw assembly, the presence of integrally assembled parts prevents the screw assembly from being directly fed in for processing like a round rod, leading to time-consuming position correction and low processing efficiency. Furthermore, using manual assistance in semi-automatic processing also results in reduced processing efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a centerless grinder, comprising a machine body, a machining mechanism disposed on the machine body, and an auxiliary mechanism disposed on the machine body. The machining mechanism includes a grinding wheel and a guide wheel. The grinding wheel is disposed on the machine body, and the guide wheel is disposed on the machine body. The grinding wheel and the guide wheel are adjacent to each other, and the grinding wheel and the guide wheel perform material processing between them.

[0007] The auxiliary mechanism includes a clamping pad and a limiting angled rod. The clamping pad is located next to the machine body and clamps and conveys the material. The limiting angled rod is located on the machine body and is positioned directly above the machining position between the grinding wheel and the guide wheel. The clamping pad conveys the material to the machining position and simultaneously positions the ends of the material in the same direction so that when the material is conveyed to the machining position, the limiting angled rod limits the material to control the processing orientation.

[0008] Preferably, the processing mechanism further includes a first stepper motor, the grinding wheel is rotatably fitted on the machine body, the grinding wheel is located on one side of the machine body, the first stepper motor is fixedly installed on one side of the machine body, and the first stepper motor is poweredly connected to the grinding wheel.

[0009] Preferably, a rail frame is fixedly installed on the other side of the machine body, the rail frame is located below the guide wheel, a bracket is slidably fitted on the rail frame, a second stepper motor is fixedly installed on the other side of the machine body, a first screw is fixedly installed on the shaft of the second stepper motor, the first screw passes through the bracket, the first screw is threadedly fitted with the bracket, and the length of the first screw is adapted to the length of the rail frame.

[0010] Preferably, the bracket is rotatably fitted with the guide wheel, and the bracket is rotatably fitted with the first pulley, which is poweredly connected to the guide wheel. A rotary cylinder is fixedly mounted on the bracket, and a second pulley is fixedly mounted on the shaft of the rotary cylinder. The second pulley and the first pulley are located at the same height, and a belt is tensioned on the second pulley and the first pulley.

[0011] Preferably, a sprayer is slidably fitted at the top of the bracket, the sprayer is located above the guide wheel, the movement range of the sprayer is adapted to the width of the guide wheel, the sprayer is used to spray lubricant onto the processing position, a second screw is rotatably fitted on the bracket, the second screw is adjacent to the movement trajectory of the sprayer, the length of the second screw is adapted to the length of the movement trajectory of the sprayer, a moving part is fixedly installed on the sprayer, the second screw passes through the moving part, the second screw and the moving part are threadedly engaged, a third stepper motor is fixedly installed on the bracket, the third stepper motor is poweredly connected to the second screw.

[0012] Preferably, a guide rail is fixedly installed on the machine body. The guide rail is divided into two parts located on both sides of the processing position. The guide rail is adjacent to the grinding wheel and the guide wheel. The guide rail is used to guide the material to the processing position and to discharge the material. A support plate is fixedly installed on the machine body. The support plate has the same length as the guide rail. The support plate passes through the guide rail from the bottom end to the material guide trajectory of the guide rail. The support plate supports the bottom end of the material in the material guide trajectory of the guide rail.

[0013] Preferably, the auxiliary mechanism further includes a feeding platform, which is fixedly installed on the other side of the machine body. The feeding platform is at the same height as the guide rail. A limiting groove is provided on the feeding platform to prevent a single material from shaking.

[0014] Preferably, a rotating arm is rotatably fitted on the unloading platform. The rotating arm is located between the limiting groove and the guide rail. The rotating arm is symmetrically arranged in two parts, each part of which is opposite to the two sides of the limiting groove. A hydraulic rod is fixedly installed on each part of the rotating arm, located between the two parts of the rotating arm. The clamping pad is rotatably fitted on the extension rod of the hydraulic rod. The deflection trajectory of the clamping pad covers the limiting groove and the guide rail. A clamping pad is fixedly installed on each part of the rotating arm. A detector is used to detect the distance between the clamping pads. A rotating cylinder is fixedly installed on the feeding platform and is poweredly connected to the rotating arm. A limiting inclined rod is fixedly installed on the machine body. The limiting inclined rod is located between the grinding wheel and the guide wheel and is directly above the guide rail. The limiting inclined rod is inclined and the end of the limiting inclined rod near the feeding platform is higher than the other end of the limiting inclined rod. The bottom end of the limiting inclined rod is sized to match the larger end of the material with the guide rail.

[0015] Preferably, a side frame is fixedly installed next to the feeding platform, and multiple conveying rollers are rotatably fitted on the side frame. A conveyor belt is tensioned on the conveying rollers. The conveyor belt is used to sequentially and intermittently convey each material into the limiting groove. A servo motor is fixedly installed on the side frame, and the servo motor is poweredly connected to the conveying rollers.

[0016] An automatic feeding and machining method for screw assemblies, using the aforementioned centerless grinder, includes the following steps:

[0017] S1: The clamping pad holds and fixes the middle of a single material and conveys the material to the processing position;

[0018] S2: Since the larger end of the material is heavier, after the clamping pad lifts the material, the material will rotate with the clamping pad, so that the larger end of the material faces down. When it is conveyed to the processing position, the larger end of the material is farther away from the clamping pad than the smaller end so that it can be placed in the processing position.

[0019] S3: The limiting angled bar restricts the material at the processing position, so that the material is placed horizontally at the processing position, so that the grinding wheel and the guide wheel can be used to process the material.

[0020] Compared with the prior art, the present invention provides a centerless grinding machine with the following advantages:

[0021] 1. This centerless grinder uses a clamping pad to hold and fix the middle of a single material and conveys the material to the processing position. Since the larger end of the material is heavier, after the clamping pad lifts the material, the material will rotate with the clamping pad, so that the larger end of the material faces downward. When conveyed to the processing position, the larger end of the material is farther away from the clamping pad than the smaller end, so that it is placed in the processing position. The limiting inclined rod restricts the material in the processing position, so that the entire material is placed horizontally in the processing position, so that the grinding wheel and guide wheel can process the material. When processing the screw assembly, the centerless grinder automatically corrects the processing position of the screw assembly and automatically calibrates the level of the screw assembly, thereby improving the processing quality and processing efficiency of the centerless grinder.

[0022] 2. This centerless grinder uses a second stepper motor to drive the first screw to rotate. The first screw drives the support to move on the rail frame. This support drives the guide wheel to move. Therefore, when it is necessary to adjust the distance between the guide wheel and the grinding wheel, the distance between the guide wheel and the grinding wheel can be changed, so that the centerless grinder can adapt to materials of different sizes and improve the applicability of the centerless grinder.

[0023] 3. This centerless grinder, through the setting of conveyor belt and limit groove, allows the screw assembly to be conveyed intermittently, so as to adapt to the rotating arm to send the screw assembly into the centerless grinder in sequence, thereby improving the smoothness of the overall processing of the centerless grinder and improving the processing efficiency of the centerless grinder. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the centerless grinding machine of the present invention;

[0025] Figure 2 This is a schematic diagram of the processing mechanism structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the body structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the structural distribution at the guide rail of the present invention;

[0028] Figure 5 This is a schematic diagram of the structural distribution at the moving part of the present invention;

[0029] Figure 6 This is a schematic diagram of the structural distribution at the belt section of the present invention;

[0030] Figure 7 This is a schematic diagram of the auxiliary mechanism structure of the present invention;

[0031] Figure 8 This is a schematic diagram of the structural distribution at the material feeding platform of the present invention;

[0032] Figure 9 for Figure 8 Enlarged structural diagram at point A in the middle;

[0033] Figure 10 This is a schematic diagram of the structural distribution at the rotating arm of the present invention;

[0034] Figure 11 for Figure 10 Enlarged structural diagram at point B;

[0035] Figure 12 This is a schematic diagram of the structural distribution at the conveyor belt of the present invention.

[0036] In the diagram: 1. Machine body; 2. Machining mechanism; 21. Grinding wheel; 22. First stepper motor; 23. Rail frame; 24. Support; 25. Second stepper motor; 26. First screw; 27. Guide wheel; 28. First pulley; 29. ​​Rotary cylinder; 210. Second pulley; 211. Belt; 212. Sprayer; 213. Second screw; 214. Moving part; 215. Third stepper motor; 216. Guide rail; 217. Support plate; 3. Auxiliary mechanism; 31. Feeding platform; 32. Limiting groove; 33. Rotating arm; 34. Hydraulic rod; 35. Clamping pad; 36. Detector; 37. Rotating shaft cylinder; 38. Limiting diagonal bar; 39. Side frame; 310. Conveyor roller; 311. Conveyor belt; 312. Servo motor. Detailed Implementation

[0037] 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 embodiments of the present invention, and not all embodiments. Based on the 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] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes an automatic feeding and processing method for a centerless grinder and screw assembly.

[0039] Example 1, a typical implementation of this application, such as Figure 1 As shown, a centerless grinder includes a machine body 1, a machining mechanism 2 disposed on the machine body 1, and an auxiliary mechanism 3 disposed on the machine body 1. The machining mechanism 2 includes a grinding wheel 21 and a guide wheel 27. The grinding wheel 21 and the guide wheel 27 are disposed on the machine body 1. The grinding wheel 21 and the guide wheel 27 are adjacent to each other, and the grinding wheel 21 and the guide wheel 27 process the material.

[0040] The auxiliary mechanism 3 includes a clamping pad 35 and a limiting angle bar 38. The clamping pad 35 is provided next to the machine body 1. The clamping pad 35 clamps and conveys the material. The limiting angle bar 38 is provided on the machine body 1. The limiting angle bar 38 is located directly above the processing position between the grinding wheel 21 and the guide wheel 27. The clamping pad 35 conveys the material to the processing position. At the same time, the clamping pad 35 places the ends of the material in the same direction in a uniform orientation so that when the material is conveyed to the processing position, the limiting angle bar 38 limits the material to control the processing orientation.

[0041] Specifically, the material being processed is a screw assembly, which, after assembly, has a large end and a small end.

[0042] When using this invention:

[0043] The clamping pad 35 clamps and fixes the middle of a single material and conveys the material to the processing position. Since the larger end of the material is heavier, after the clamping pad 35 lifts the material, the material will rotate with the clamping pad 35, so that the larger end of the material faces downward. When it is conveyed to the processing position, the larger end of the material is farther away from the clamping pad 35 than the smaller end, so that it is placed in the processing position. The limiting inclined rod 38 restricts the material in the processing position, so that the material is placed horizontally in the processing position, so that the grinding wheel 21 and the guide wheel 27 can be used to process the material. Thus, when processing the screw assembly, the centerless grinder automatically corrects the processing position of the screw assembly and automatically calibrates the level of the screw assembly, thereby improving the processing quality of the centerless grinder and improving the processing efficiency of the centerless grinder.

[0044] Example 2, as Figures 2-6 As shown, the difference from the above embodiment is that the processing mechanism 2 also includes a first stepper motor 22, the grinding wheel 21 is rotatably fitted on the machine body 1, the grinding wheel 21 is located on one side of the machine body 1, and the first stepper motor 22 is fixedly installed on one side of the machine body 1. The first stepper motor 22 is poweredly connected to the grinding wheel 21.

[0045] Furthermore, a sprocket can be used to drive the first stepper motor 22 and the grinding wheel 21, thereby improving the stability of the power transmission.

[0046] Furthermore, a rail frame 23 is fixedly installed on the other side of the machine body 1. The rail frame 23 is located below the guide wheel 27. A bracket 24 is slidably fitted on the rail frame 23. A second stepper motor 25 is fixedly installed on the other side of the machine body 1. A first screw 26 is fixedly installed on the shaft of the second stepper motor 25. The first screw 26 passes through the bracket 24 and is threadedly fitted with the bracket 24. The length of the first screw 26 is adapted to the length of the rail frame 23.

[0047] Furthermore, a guide wheel 27 is rotatably fitted on the bracket 24, and a first pulley 28 is rotatably fitted on the bracket 24. The first pulley 28 is poweredly connected to the guide wheel 27. A rotary cylinder 29 is fixedly installed on the bracket 24, and a second pulley 210 is fixedly installed on the shaft of the rotary cylinder 29. The second pulley 210 and the first pulley 28 are located at the same height, and a belt 211 is tensioned on the second pulley 210 and the first pulley 28.

[0048] Furthermore, a sprayer 212 is slidably fitted at the top of the bracket 24. The sprayer 212 is located above the guide wheel 27, and the range of motion of the sprayer 212 is adapted to the width of the guide wheel 27. The sprayer 212 is used to spray lubricant onto the processing position. A second screw 213 is rotatably fitted on the bracket 24. The second screw 213 is adjacent to the movement trajectory of the sprayer 212, and the length of the second screw 213 is adapted to the length of the movement trajectory of the sprayer 212. A moving part 214 is fixedly installed on the sprayer 212, and the second screw 213 passes through the moving part 214. The second screw 213 and the moving part 214 are threadedly engaged. A third stepper motor 215 is fixedly installed on the bracket 24, and the third stepper motor 215 is poweredly connected to the second screw 213.

[0049] Furthermore, a guide rail 216 is fixedly installed on the machine body 1. The guide rail 216 is divided into two parts located on both sides of the processing position. The guide rail 216 is adjacent to the grinding wheel 21 and the guide wheel 27. The guide rail 216 is used to guide the material to the processing position and to discharge the material. A support plate 217 is fixedly installed on the machine body 1. The support plate 217 has the same length as the guide rail 216. The support plate 217 passes through the bottom of the guide rail 216 into the material guide trajectory of the guide rail 216. The support plate 217 supports the bottom end of the material in the material guide trajectory of the guide rail 216.

[0050] During processing, the screw assembly is placed on the guide rail 216. As the screw assemblies are fed one by one along the guide rail 216, they move between the grinding wheel 21 and the guide wheel 27. The first stepper motor 22 is then activated, driving the grinding wheel 21 to rotate. Simultaneously, the rotary cylinder 29 is activated, driving the second pulley 210 to rotate. The second pulley 210 drives the belt 211 to rotate, which in turn drives the first pulley 28 to rotate. The first pulley 28 then drives the guide wheel 27 to rotate, thus utilizing the guide wheel 27, grinding wheel 21, and support plate 217 to form a three-point co-positioning mechanism. This, combined with the rotational friction of the grinding wheel 21, processes the screw assembly. At the same time, the third stepper motor 215 is activated. The third stepper motor 215 drives the second screw 213 to rotate, the second screw 213 drives the moving part 214 to move, and the moving part 214 drives the sprayer 212 to move, so that the sprayer 212 moves back and forth above the guide wheel 27, so as to spray lubricant onto the processing position. When it is necessary to adjust the distance between the guide wheel 27 and the grinding wheel 21, the second stepper motor 25 is started. The second stepper motor 25 drives the first screw 26 to rotate, and the first screw 26 drives the bracket 24 to move on the rail frame 23. The bracket 24 drives the guide wheel 27 to move, thereby changing the distance between the guide wheel 27 and the grinding wheel 21, so that the centerless grinder can adapt to materials of different sizes and improve the applicability of the centerless grinder.

[0051] Example 3, as Figures 7-12As shown, the difference from the above embodiment is that the auxiliary mechanism 3 also includes a feeding platform 31, which is fixedly installed on the other side of the machine body 1. The feeding platform 31 and the guide rail 216 are at the same height. A limit groove 32 is provided on the feeding platform 31 to limit the movement of a single material.

[0052] Furthermore, a rotating arm 33 is rotatably fitted on the feeding platform 31. The rotating arm 33 is located between the limiting groove 32 and the guide rail 216. The rotating arm 33 is symmetrically arranged in two parts, each part of which is opposite to the two sides of the limiting groove 32. A hydraulic rod 34 is fixedly installed on each part of the rotating arm 33. The hydraulic rod 34 is located between the two parts of the rotating arm 33. A clamping pad 35 is rotatably fitted on the extension rod of the hydraulic rod 34. The deflection trajectory of the clamping pad 35 covers the limiting groove 32 and the guide rail 216. A hydraulic rod 34 is fixedly installed on each part of the rotating arm 33. A detector 36 is provided to detect the distance between the clamping pads 35. A rotating cylinder 37 is fixedly installed on the feeding table 31. The rotating cylinder 37 is poweredly connected to the rotating arm 33. A limiting rod 38 is fixedly installed on the machine body 1. The limiting rod 38 is located between the grinding wheel 21 and the guide wheel 27. The limiting rod 38 is located directly above the guide rail 216. The limiting rod 38 is inclined. The height of the end of the limiting rod 38 near the feeding table 31 is higher than the other end of the limiting rod 38. The size between the bottom end of the limiting rod 38 and the guide rail 216 is adapted to the larger end size of the material.

[0053] Furthermore, a side frame 39 is fixedly installed next to the feeding platform 31. Multiple conveyor rollers 310 are rotatably mounted on the side frame 39. A conveyor belt 311 is tensioned on the overall conveyor rollers 310. The conveyor belt 311 is used to sequentially and intermittently convey various materials into the limiting groove 32. A servo motor 312 is fixedly installed on the side frame 39. The servo motor 312 is poweredly connected to the conveyor rollers 310.

[0054] Furthermore, the conveying structure formed by the conveyor belt 311 is connected to the conveying system of the screw assembly, so that the screw assembly line in the conveying system is conveyed to the conveyor belt 311, and then conveyed by the conveyor belt 311.

[0055] During automatic screw assembly transfer, the servo motor 312 is activated, driving the transfer roller 310 to rotate. The transfer roller 310 then drives the conveyor belt 311 to rotate, causing the conveyor belt 311 to intermittently transfer the screw assemblies one by one onto the unloading table 31. The screw assemblies falling from the conveyor belt 311 will fall into the limiting groove 32 of the unloading table 31. The limiting groove 32 will only effectively restrain one screw assembly at a time, while the screw assemblies in the limiting groove 32 that have not been transferred will remain untransferred. At this time, the conveyor belt 311 will no longer convey the next screw assembly into the limiting groove 32. Then, the rotating cylinder 37 is activated, which drives the rotating arm 33 to rotate. The rotating arm 33 drives the hydraulic rod 34 to deflect, and the hydraulic rod 34 drives the clamping pad 35 to deflect, so that the clamping pad 35 moves to both sides of the middle part of the screw assembly in the limiting groove 32. The hydraulic rod 34 is activated, and the hydraulic rod 34 drives the clamping pad 35 to clamp and fix the two sides of the middle part of the screw assembly. Then, the rotating arm 33 drives the clamping pad 35 to... The screw assembly is conveyed onto the guide rail 216. During this process, the screw assembly is lifted by the clamping pad 35, and due to its own weight, the large end of the screw assembly will fall to the bottom due to gravity while it is being lifted and deflected. Then, the large end of the screw assembly will first contact the guide rail 216. As the rotating arm 33 continues to deflect, it pushes the large end of the screw assembly onto the guide rail 216, allowing it to slide. With the rotation of the rotating arm 33, the small end of the screw assembly will then fall onto the guide rail. On 216, the screw assemblies on the guide rail 216 are all oriented with their small ends facing the feeding table 31. Then, as the rotating arm 33 intermittently places the screw assemblies on the guide rail 216, the screw assembly is pushed to the processing position. At the processing position, the screw assembly is restricted by the limiting inclined rod 38, causing the large end of the screw assembly to be squeezed by the limiting inclined rod 38 and the small end to be lifted. This makes the screw assembly horizontal in the processing position, thus ensuring the quality of the screw assembly processing.

[0056] Working principle of the invention:

[0057] The clamping pad 35 clamps and fixes the middle of a single material and conveys the material to the processing position. Since the larger end of the material is heavier, after the clamping pad 35 lifts the material, the material will rotate with the clamping pad 35, so that the larger end of the material faces downward. When it is conveyed to the processing position, the larger end of the material is farther away from the clamping pad 35 than the smaller end, so that it is placed in the processing position. The limiting inclined bar 38 restricts the material in the processing position, so that the material is placed horizontally in the processing position. The grinding wheel 21 and the guide wheel 27 are used to process the material. When processing the screw assembly, the centerless grinder automatically corrects the processing position of the screw assembly and automatically calibrates the level of the screw assembly, thereby improving the processing quality of the centerless grinder and improving the processing efficiency of the centerless grinder.

[0058] During processing, the screw assembly is placed on the guide rail 216. As the screw assemblies are fed one by one along the guide rail 216, they move between the grinding wheel 21 and the guide wheel 27. The first stepper motor 22 is then activated, driving the grinding wheel 21 to rotate. Simultaneously, the rotary cylinder 29 is activated, driving the second pulley 210 to rotate. The second pulley 210 drives the belt 211 to rotate, which in turn drives the first pulley 28 to rotate. The first pulley 28 then drives the guide wheel 27 to rotate, thus utilizing the guide wheel 27, grinding wheel 21, and support plate 217 to form a three-point co-positioning mechanism. This, combined with the rotational friction of the grinding wheel 21, processes the screw assembly. At the same time, the third stepper motor 215 is activated. The third stepper motor 215 drives the second screw 213 to rotate, the second screw 213 drives the moving part 214 to move, and the moving part 214 drives the sprayer 212 to move, so that the sprayer 212 moves back and forth above the guide wheel 27, so as to spray lubricant onto the processing position using the sprayer 212. When it is necessary to adjust the distance between the guide wheel 27 and the grinding wheel 21, the second stepper motor 25 is started, the second stepper motor 25 drives the first screw 26 to rotate, the first screw 26 drives the bracket 24 to move on the rail frame 23, and the bracket 24 drives the guide wheel 27 to move, thereby changing the distance between the guide wheel 27 and the grinding wheel 21, so that the centerless grinder can adapt to materials of different sizes and improve the applicability of the centerless grinder;

[0059] When automatically conveying the screw assembly, the servo motor 312 is started, driving the conveyor roller 310 to rotate. The conveyor roller 310 drives the conveyor belt 311 to rotate, causing the conveyor belt 311 to carry the screw assemblies one by one intermittently onto the unloading table 31. The screw assemblies falling from the conveyor belt 311 will fall into the limiting groove 32 of the unloading table 31. The limiting groove 32 will only effectively restrain one screw assembly at a time. If a screw assembly in the limiting groove 32 is not conveyed away, the conveyor... The feeder 311 will no longer feed the next screw assembly into the limiting groove 32. Then, the rotating cylinder 37 is activated, which drives the rotating arm 33 to rotate. The rotating arm 33 drives the hydraulic rod 34 to deflect, and the hydraulic rod 34 drives the clamping pad 35 to deflect, so that the clamping pad 35 moves to both sides of the middle part of the screw assembly in the limiting groove 32. The hydraulic rod 34 is activated, and the hydraulic rod 34 drives the clamping pad 35 to clamp and fix the middle part of the screw assembly. Then, the rotating arm 33 drives the clamping pad 35 to hold the screw... The assembly is conveyed onto guide rail 216. During this process, the screw assembly is lifted by clamping pad 35, and due to its own weight, the large end of the screw assembly will fall to the bottom due to gravity while being lifted and deflected. Then, the large end of the screw assembly will first contact guide rail 216. As the rotating arm 33 continues to deflect, it pushes the large end of the screw assembly onto guide rail 216, allowing it to slide. With the rotation of the rotating arm 33, the small end of the screw assembly will then fall onto guide rail 216. On 16, the screw assemblies on the guide rail 216 are all oriented with their small ends facing the feeding table 31. Then, as the rotating arm 33 intermittently places the screw assemblies on the guide rail 216, the screw assembly is pushed to the processing position. At the processing position, the screw assembly is restricted by the limiting inclined rod 38, causing the large end of the screw assembly to be squeezed by the limiting inclined rod 38 and the small end to be lifted. This makes the screw assembly horizontal in the processing position, thus ensuring the quality of the screw assembly processing.

[0060] An automatic feeding and machining method for screw assemblies, using the aforementioned centerless grinder, includes the following steps:

[0061] S1: Clamping pad 35 clamps and fixes the middle of a single material and transfers the material to the processing position;

[0062] S2: Since the larger end of the material is heavier, after the clamping pad 35 lifts the material, the material will rotate with the clamping pad 35, so that the larger end of the material faces down. When it is conveyed to the processing position, the larger end of the material is farther away from the clamping pad 35 than the smaller end so that it can be placed in the processing position.

[0063] S3: The limiting diagonal bar 38 restricts the material at the processing position, so that the material is placed horizontally at the processing position, so that the grinding wheel 21 and the guide wheel 27 can be used to process the material.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A centerless grinding machine, comprising a machine body, a machining mechanism disposed on the machine body, and an auxiliary mechanism disposed on the machine body, characterized in that: The processing mechanism includes a grinding wheel and a guide wheel. The grinding wheel is mounted on the machine body, and the guide wheel is mounted on the machine body. The grinding wheel and the guide wheel are adjacent to each other, and the grinding wheel and the guide wheel process the material. The auxiliary mechanism includes a clamping pad and a limiting angled bar. The clamping pad is located next to the machine body and clamps and conveys the material. The limiting angled bar is located on the machine body and is positioned directly above the processing position between the grinding wheel and the guide wheel. The clamping pad conveys the material to the processing position and simultaneously positions the ends of the material in the same direction so that when the material is conveyed to the processing position, the limiting angled bar limits the material to control the processing orientation. The auxiliary mechanism also includes a feeding platform, which is fixedly installed on the other side of the machine body. A limit groove is provided on the feeding platform to prevent a single material from shaking. A guide rail is fixedly installed on the machine body. The feeding platform is at the same height as the guide rail. The guide rail is divided into two parts located on both sides of the processing position. A rotating arm is rotatably fitted on the feeding platform. The rotating arm is located between the limiting groove and the guide rail. The rotating arm is symmetrically arranged in two parts. Each part of the rotating arm is opposite to the two sides of the limiting groove. A hydraulic rod is fixedly installed on each part of the rotating arm. The hydraulic rod is located between the two parts of the rotating arm. The clamping pad is rotatably fitted on the extension rod of the hydraulic rod. The deflection trajectory of the clamping pad covers the limiting groove and the guide rail. A limiting inclined rod is fixedly installed on the machine body. The limiting inclined rod is located between the grinding wheel and the guide wheel. The limiting inclined rod is located directly above the guide rail. The limiting inclined rod is inclined. The end of the limiting inclined rod near the feeding platform is higher than the other end of the limiting inclined rod. The bottom end of the limiting inclined rod is sized to match the larger end of the material of the guide rail.

2. The centerless grinding machine according to claim 1, characterized in that: The processing mechanism also includes a first stepper motor. The grinding wheel is rotatably mounted on the machine body. The grinding wheel is located on one side of the machine body. The first stepper motor is fixedly installed on one side of the machine body. The first stepper motor is poweredly connected to the grinding wheel.

3. A centerless grinding machine according to claim 2, characterized in that: A rail frame is fixedly installed on the other side of the machine body. The rail frame is located below the guide wheel. A bracket is slidably fitted on the rail frame. A second stepper motor is fixedly installed on the other side of the machine body. A first screw is fixedly installed on the shaft of the second stepper motor. The first screw passes through the bracket and is threadedly engaged with the bracket. The length of the first screw is adapted to the length of the rail frame.

4. A centerless grinding machine according to claim 3, characterized in that: The bracket is rotatably fitted with the guide wheel, and the bracket is rotatably fitted with the first pulley. The first pulley is poweredly connected to the guide wheel. The bracket is fixedly mounted with a rotary cylinder, and the shaft of the rotary cylinder is fixedly mounted with a second pulley. The second pulley and the first pulley are located at the same height, and a belt is tensioned on the second pulley and the first pulley.

5. A centerless grinding machine according to claim 4, characterized in that: A sprayer is slidably fitted at the top of the bracket, and the sprayer is located above the guide wheel. The range of motion of the sprayer is adapted to the width of the guide wheel. The sprayer is used to spray lubricant onto the processing position. A second screw is rotatably fitted on the bracket, and the second screw is adjacent to the movement trajectory of the sprayer. The length of the second screw is adapted to the length of the movement trajectory of the sprayer. A moving part is fixedly installed on the sprayer, and the second screw passes through the moving part. The second screw and the moving part are threadedly engaged. A third stepper motor is fixedly installed on the bracket, and the third stepper motor is poweredly connected to the second screw.

6. A centerless grinding machine according to claim 5, characterized in that: The guide rail is adjacent to the grinding wheel and the guide wheel. The guide rail is used to guide the material to the processing position and the material exit. A support plate is fixedly installed on the machine body. The support plate has the same length as the guide rail. The support plate passes through the guide rail from the bottom end to the material guide track of the guide rail. The support plate supports the bottom end of the material in the material guide track of the guide rail.

7. A centerless grinding machine according to claim 6, characterized in that: Each part of the rotating arm is fixedly equipped with a detector, which is used to detect the distance between the clamping pads. A rotating shaft cylinder is fixedly installed on the feeding platform, and the rotating shaft cylinder is poweredly connected to the rotating arm.

8. A centerless grinding machine according to claim 7, characterized in that: A side frame is fixedly installed next to the feeding platform. Multiple conveying rollers are rotatably mounted on the side frame. A conveyor belt is tensioned on the conveying rollers. The conveyor belt is used to intermittently convey each material into the limiting groove. A servo motor is fixedly installed on the side frame. The servo motor is poweredly connected to the conveying rollers.

9. An automatic feeding and machining method for a screw assembly, using the centerless grinder as described in claim 8, characterized in that, Includes the following steps: S1: The clamping pad holds and fixes the middle of a single material and conveys the material to the processing position; S2: Since the larger end of the material is heavier, after the clamping pad lifts the material, the material will rotate with the clamping pad, so that the larger end of the material faces down. When it is conveyed to the processing position, the larger end of the material is farther away from the clamping pad than the smaller end so that it can be placed in the processing position. S3: The limiting angled bar restricts the material at the processing position, so that the material is placed horizontally at the processing position, so that the grinding wheel and the guide wheel can be used to process the material.

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