A bar clamping and guiding wheel mechanism for a precision grinder

Abstract

The present application discloses a bar clamping and guiding wheel mechanism for a precision grinding machine, which includes a fixed seat. A bar placement mechanism, a guiding wheel mechanism, and a pressing wheel limiting mechanism are provided on the fixed seat. The bar placement mechanism is used to place the bar to be processed. The guiding wheel mechanism is used to drive the bar to be processed to rotate. The pressing wheel limiting mechanism is used to limit the bar to be processed on the bar placement mechanism. The guiding wheel mechanism includes a rotation driving mechanism and a guiding wheel. The rotation driving mechanism is connected to the fixed seat, and the output end of the rotation driving mechanism is connected to the guiding wheel. The rotation driving mechanism is used to drive the guiding wheel to rotate. In the present application, the rotation driving mechanism drives the guiding wheel to rotate, and the guiding wheel drives the bar to rotate synchronously on the bar placement mechanism, so that the precision grinding machine can evenly grind the outer circumferential surface of the drill bit, improve the concentricity between the bar and the drill bit, and meet the processing requirements of high-precision micro drills.

Description

Technical Field

[0001] This application belongs to the field of precision tool processing, and more specifically, relates to a bar clamping guide wheel mechanism for a precision grinding machine. Background Art

[0002] A drill bit with a diameter less than 3.175 mm is usually called a micro drill bit, or simply a micro drill. The micro drill mainly consists of a bar at the bottom and a drill needle at the upper part. During the production process of the micro drill, grinding and grooving need to be performed on the drill needle part of the micro drill. Traditional grinding equipment is difficult to meet the requirements of mass production and processing, and the defective rate is relatively high. Using a precision grinding machine can well solve these problems.

[0003] During the process of the precision grinding machine processing the micro drill, the bar needs to be clamped and fixed to the grinding workstation to facilitate the grinding process of the bar. To ensure that the outer circumferential surface of the drill needle is evenly polished during the grinding process, the drill needle needs to be in a rotating state during grinding; in other words, the clamping mechanism of the precision grinding machine needs to drive the bar to rotate. Currently, the clamping mechanisms that can achieve rotation all clamp the workpiece through jaws and then drive the jaws to rotate to drive the workpiece to rotate; during the processing of this kind of clamping mechanism, the workpiece is prone to shift within the jaws, resulting in a low concentricity between the bar and the drill needle in the processed micro drill, and unable to meet the processing requirements of high-precision micro drills. Summary of the Invention

[0004] To meet the processing requirements of high-precision micro drills, this application provides a bar clamping guide wheel mechanism for a precision grinding machine, including a fixed seat. A bar placement mechanism, a guide wheel mechanism, and a pressure wheel limiting mechanism are provided on the fixed seat. The bar placement mechanism is used to place the bar to be processed, the guide wheel mechanism is used to drive the bar to be processed to rotate, and the pressure wheel limiting mechanism is used to limit the bar to be processed on the bar placement mechanism; the guide wheel mechanism includes a rotation driving mechanism and a guide wheel. The rotation driving mechanism is connected to the fixed seat, and the output end of the rotation driving mechanism is connected to the guide wheel. The rotation driving mechanism is used to drive the guide wheel to rotate.

[0005] As a further improvement of this application, the rotation driving mechanism includes a driving motor and a transmission shaft. The driving motor is connected to the fixed seat. One end of the transmission shaft is connected to the guide wheel, and the other end of the transmission shaft is connected to the output end of the driving motor.

[0006] As a further improvement of this application, the pressure wheel limiting mechanism includes a pressure wheel cylinder and a push rod. The pressure wheel cylinder and the push rod are respectively connected to the fixed seat. One end of the push rod is connected to the output end of the pressure wheel cylinder, and a pressure wheel is provided at the other end of the push rod. The pressure wheel is rotatably and limitably connected to the push rod.

[0007] As a further improvement of the present application, the bar placement mechanism includes a blank pushing cylinder and a ejector pin. The blank pushing cylinder is connected to the fixed seat, and the ejector pin is connected to the output end of the blank pushing cylinder.

[0008] As a further improvement of the present application, a bar aligning mechanism is provided on the fixed seat. The bar aligning mechanism includes a base and an alignment adjusting block. The base is connected to the fixed seat, the alignment adjusting block is adjustably and limit-connected to the base, and a first wear-resistant block is provided at one end of the alignment adjusting block.

[0009] As a further improvement of the present application, a card slot adapted to the alignment adjusting block is provided on the base. The alignment adjusting block is limited in the card slot. An internal thread hole is provided on the card slot, a waist-shaped hole is provided on the alignment adjusting block, and the waist-shaped hole and the internal thread hole are connected by a screw.

[0010] As a further improvement of the present application, an adjusting screw is provided at the end of the alignment adjusting block away from the first wear-resistant block. The adjusting screw is adjustably and thread-connected to the alignment adjusting block. The other end of the adjusting screw is connected to the base. An elastic member is sleeved on the adjusting screw, and both ends of the elastic member are respectively connected to the base and the alignment adjusting block.

[0011] As a further improvement of the present application, a drill bit aligning mechanism is provided on the fixed seat. The drill bit aligning mechanism is used to correct the concentricity between the bar and the drill bit. The drill bit aligning mechanism includes an alignment fixing block. The alignment fixing block is connected to the fixed seat. An alignment pushing mechanism is provided on the alignment fixing block. A drill bit alignment rod is provided on the alignment pushing mechanism. The alignment pushing mechanism is used to push the drill bit alignment rod to abut against the drill bit.

[0012] As a further improvement of the present application, the alignment pushing mechanism includes a pulling cylinder, a pushing connecting rod, and an alignment rod mounting block. The pulling cylinder is connected to the alignment fixing block. The middle of the pushing connecting rod is hinged to the alignment fixing block. One end of the pushing connecting rod is connected to the output end of the pulling cylinder. The other end of the pushing connecting rod is connected to the alignment rod mounting block. The drill bit alignment rod is adjustably and limit-connected to the alignment rod mounting block.

[0013] As a further improvement of the present application, an adjusting mechanism is provided on the alignment fixing block. The adjusting mechanism is used to adjust the pushing stroke of the pushing connecting rod. The adjusting mechanism includes an adjusting fixing block. The adjusting fixing block is connected to the alignment fixing block. A micrometer is provided on the adjusting fixing block. The screw of the micrometer can abut against one end of the pushing connecting rod close to the pulling cylinder.

[0014] Compared with the prior art, the beneficial effects of the present application are:

[0015] Through the cooperation of the bar placement mechanism and the pressure wheel limiting mechanism, the present application can limit the bar on the bar placement mechanism, prevent the bar from shifting during the processing, and ensure the stability of the bar clamping. During the processing of the fine grinder, the bar is tangent to and abuts against the guide wheel and the pressure wheel limiting mechanism respectively. By driving the guide wheel to rotate through the rotary driving mechanism, the guide wheel drives the bar to rotate synchronously on the bar placement mechanism, enabling the fine grinder to grind the outer circumferential surface of the drill bit evenly, improving the concentricity between the bar and the drill bit, and meeting the processing requirements of high-precision micro drills. Description of the Drawings

[0016] In order to more clearly illustrate the solutions in the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is the overall structural schematic diagram of the embodiment of the present application;

[0018] Figure 2 is the exploded structural schematic diagram of the guide wheel mechanism in the embodiment of the present application;

[0019] Figure 3 is the exploded structural schematic diagram of the bar centering mechanism in the embodiment of the present application;

[0020] Figure 4 is the structural schematic diagram of the drill bit centering mechanism in the embodiment of the present application;

[0021] Figure 5 is the exploded structural schematic diagram of the centering rod mounting block and the drill bit centering rod in the embodiment of the present application. Detailed Embodiments

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used in the description of the present application in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order.

[0023] Reference to "embodiments" in this document means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0024] To enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0025] As Figures 1-5 shown, a bar clamping and guiding wheel mechanism for a precision grinder, the precision grinder includes a machine table and a controller, and a manipulator for loading and unloading is provided on the machine table, and the manipulator is connected to the controller. This bar clamping and guiding wheel mechanism is used to clamp the bar to be processed when the precision grinder processes micro drills, so as to facilitate the grinding mechanism of the precision grinder to grind the bar. The micro drill mainly consists of a bar at the bottom and a drill bit at the upper part.

[0026] The bar clamping and guiding wheel mechanism includes a fixed seat 1, which is fixedly installed on the machine table. The fixed seat 1 is provided with a bar placement mechanism 2, a guiding wheel mechanism 3, a pressing wheel limiting mechanism 4, a bar straightening mechanism 5, and a drill bit straightening mechanism 6. The bar placement mechanism 2, the guiding wheel mechanism 3, the pressing wheel limiting mechanism 4, and the drill bit straightening mechanism 6 are respectively connected to the controller; the bar placement mechanism 2 is used to place the bar during processing, plays a role in supporting the bar during processing, and is also used to push the bar out of this bar clamping and guiding wheel mechanism; the bar straightening mechanism 5 is used to support the side wall of the bar. When the bar clamping and guiding wheel mechanism is feeding, the bar straightening mechanism 5 plays a role in supporting the side wall of the bar, and can ensure that the bar is placed upright on the bar placement mechanism 2; when the precision grinder is processing, the bar straightening mechanism 5 cooperates with the guiding wheel mechanism 3 and the pressing wheel limiting mechanism 4 to limit the bar on the bar placement mechanism 2, and can ensure that the bar does not shift within the bar placement mechanism 2, facilitating the precision grinder to grind the bar; the guiding wheel mechanism 3 is used to drive the bar to rotate, and by driving the bar to rotate, it can ensure that the circumferential surface of the side wall of the drill bit can be ground evenly, improving the concentricity between the drill bit and the bar; the pressing wheel limiting mechanism 4 is used to limit the bar to be processed on the bar placement mechanism 2. During processing, the pressing wheel limiting mechanism 4 can rotate with the bar, so as to ensure that the circumferential surface of the side wall of the drill bit can be ground evenly; the drill bit straightening mechanism 6 is used to correct the concentricity between the bar and the drill bit, and can support the drill bit during processing, preventing the drill bit from bending sideways during processing, and improving the concentricity between the drill bit and the bar.

[0027] When loading the bar stock clamping guide wheel mechanism, the manipulator grabs the bar stock and places it on the bar stock placement mechanism 2. At this time, the bar stock straightening mechanism 5 and the guide wheel mechanism 3 are respectively in contact with the side wall of the bar stock to ensure that the bar stock stands upright on the bar stock placement mechanism 2. Then, the controller controls the movement of the pressure wheel limiting mechanism 4, so that the pressure wheel limiting mechanism 4 moves closer to the guide wheel mechanism 3 and the bar stock straightening mechanism 5 until the pressure wheel limiting mechanism 4 is in contact with the side wall of the bar stock, completing the loading. At this time, the bar stock is limited between the bar stock straightening mechanism 5, the guide wheel mechanism 3 and the pressure wheel limiting mechanism 4, and the support column at the bottom of the bar stock is supported by the bar stock placement mechanism 2, ensuring that the bar stock is stably clamped in the bar stock clamping guide wheel mechanism and not easily displaced. During processing, the controller controls the guide wheel mechanism 3 and the drill bit straightening mechanism 6 to work respectively. The drill bit straightening mechanism 6 moves to be in contact with the outer wall of the drill bit, providing support for the drill bit to prevent the drill bit from bending during grinding. The guide wheel mechanism 3 works to drive the bar stock to rotate in place. At this time, the pressure wheel limiting mechanism 4 will rotate with the bar stock, and the precision grinder then grinds the drill bit. The rotation of the bar stock can ensure that the circumferential side wall of the drill bit is evenly ground, improving the concentricity between the bar stock and the drill bit.

[0028] The guide wheel mechanism 3 includes a driving motor 31, a transmission shaft 32 and a guide wheel 33. The driving motor 31 is connected to the controller and is fixedly installed on the fixed seat 1. The output end of the driving motor 31 is fixedly connected to one end of the transmission shaft 32, and the other end of the transmission shaft 32 is fixedly connected to the guide wheel 33. The transmission shaft 32 is limited and fixedly connected to the fixed seat 1 through a bearing 34, and the transmission shaft 32 can rotate within the fixed seat 1. During operation, the outer side wall of the guide wheel 33 is in contact with the side wall of the bar stock. The controller controls the driving motor 31 to work, and the driving motor 31 drives the transmission shaft 32 to rotate. The transmission shaft 32 drives the guide wheel 33 to rotate synchronously, and the guide wheel 33 drives the bar stock to rotate in place. The guide wheel 33 can not only limit the bar stock but also drive the bar stock to rotate, ensuring that the circumferential side surface of the drill bit can be evenly ground.

[0029] The bar placement mechanism 2 includes a blank ejecting cylinder 21 and a ejector pin 22. The blank ejecting cylinder 21 is fixedly installed on the fixed seat 1 and is connected to the controller. The blank ejecting cylinder 21 is fixed below one side of the guide wheel 33. The ejector pin 22 is fixedly connected to the output end of the blank ejecting cylinder 21. A sensor 23 is provided at the corresponding position of the fixed seat 1 for the ejector pin 22, and the sensor 23 is connected to the controller to detect whether the bar on the ejector pin 22 is in place. During loading, the blank ejecting cylinder 21 operates to push the ejector pin 22 upward. The manipulator of the precision grinder places the bar on the ejector pin 22, and the ejector pin 22 can support the bottom end of the bar. Control the blank ejecting cylinder 21 to reset, driving the ejector pin 22 and the bar to descend to the processing position. When the sensor 23 detects that the bar on the ejector pin 22 is in place, it feeds back a signal to the controller, and the controller makes the guide wheel mechanism 3 and the pressure wheel limiting mechanism 4 operate to limit the bar on the ejector pin 22. During unloading, the blank ejecting cylinder 21 operates to push the ejector pin 22 upward, and the ejector pin 22 lifts the bar to facilitate the manipulator to grab the processed bar.

[0030] The pressure wheel limiting mechanism 4 includes a pressure wheel cylinder 41 and a push rod 42. The pressure wheel cylinder 41 is connected to the controller and is fixedly installed on the fixed seat 1. The output end of the pressure wheel cylinder 41 is provided with a connecting rod 43. The middle of the push rod 42 is hinged to the fixed seat 1. One end of the push rod 42 is fixedly connected to the end of the connecting rod 43 away from the pressure wheel cylinder 41, and the other end of the push rod 42 is provided with a pressure wheel 44. The pressure wheel 44 is rotatably and limit-connected to the push rod 42. During loading, the controller controls the pressure wheel cylinder 41 to operate. The pressure wheel cylinder 41 pushes the push rod 42 to swing around the hinge point through the connecting rod 43, thereby pushing the pressure wheel 44 to move towards the direction close to the guide wheel 33 until the pressure wheel 44 abuts against the side wall of the bar on the ejector pin 22. During processing, the rotation of the bar can drive the pressure wheel 44 to rotate on the push rod 42, ensuring that the side wall of the drill bit can be ground evenly. During unloading, the controller controls the pressure wheel cylinder 41 to reset. The pressure wheel cylinder 41 pulls the push rod 42 to swing around the hinge point through the connecting rod 43, thereby pulling the pressure wheel 44 to move away from the guide wheel 33 until the guide wheel 33 separates from the bar on the ejector pin 22, facilitating the manipulator to grab the bar.

[0031] The bar aligning mechanism 5 is installed on one side of the bar placement mechanism 2. The bar aligning mechanism 5 includes a base 51 and an alignment adjusting block 52. The base 51 is fixedly installed on the fixed seat 1 by screws. The alignment adjusting block 52 is adjustably and limit-connected to the base 51. One end of the alignment adjusting block 52 close to the thimble 22 is provided with a first wear-resistant block 53. The first wear-resistant block 53 is fixedly connected to the alignment adjusting block 52 by screws. The first wear-resistant block 53 is made of polycrystalline diamond material and has good wear resistance. During operation, the first wear-resistant block 53 abuts against the bar. The bar rotates on the thimble 22 and is in a friction sliding state with the first wear-resistant block 53. The setting of the first wear-resistant block 53 can prevent wear, improve the stability of micro-drill machining, and ensure the accuracy of micro-drill machining.

[0032] The alignment adjusting block 52 and the base 51 adopt an adjustable connection method to meet the needs of processing bars with different diameters. Specifically, the base 51 is provided with a slot 511 adapted to the outer dimension of the alignment adjusting block 52. The alignment adjusting block 52 is limited in the slot 511. The slot 511 is provided with an internal threaded hole 512. The alignment adjusting block 52 is provided with a kidney-shaped hole 521. The kidney-shaped hole 521 and the internal threaded hole 512 are connected by screws. One end of the alignment adjusting block 52 away from the first wear-resistant block 53 is provided with an adjusting screw 54. The adjusting screw 54 is adjustably thread-connected to the alignment adjusting block 52. The other end of the adjusting screw 54 is clamped and fixed to the base 51. A spring 55 is sleeved on the adjusting screw 54. The two ends of the spring 55 are respectively connected to the base 51 and the alignment adjusting block 52. The setting of the spring 55 is convenient for pushing the alignment adjusting block 52 on the one hand, and on the other hand, it is to prevent the connection between the alignment adjusting block 52 and the base 51 from loosening and improve the structural stability. When adjustment is required, loosen the connection screw between the kidney-shaped hole 521 and the internal threaded hole 512, and then rotate the adjusting screw 54. The adjusting screw 54 pushes or pulls the alignment adjusting block 52 to slide in the slot 511. After reaching the appropriate position, tighten the connection screw between the kidney-shaped hole 521 and the internal threaded hole 512, so as to adjust the distance between the first wear-resistant block 53 and the thimble 22 to meet the processing requirements of bars with different diameters.

[0033] The drill needle alignment mechanism 6 includes an alignment fixing block 61, a pulling cylinder 62, a pushing connecting rod 63, and a drill needle rod mounting block 64. The alignment fixing block 61 is fixedly connected to the fixed seat 1 by screws. The pulling cylinder 62 is fixedly installed on the alignment fixing block 61 and is connected to the controller. The middle of the pushing connecting rod 63 is hinged to the alignment fixing block 61, and the pushing connecting rod 63 can swing back and forth with the hinge point as the axis. One end of the pushing connecting rod 63 is fixedly connected to the output end of the pulling cylinder 62, and the other end of the pushing connecting rod 63 is fixedly connected to the drill needle rod mounting block 64. A drill needle alignment rod 65 is provided on the drill needle rod mounting block 64, and the drill needle alignment rod 65 is connected to the drill needle rod mounting block 64 in an adjustable and limited manner. In the normal state, the piston of the pulling cylinder 62 is in the extended state. During processing, the controller controls the pulling cylinder 62 to work. The retraction of the piston of the pulling cylinder 62 drives the pushing connecting rod 63 to swing with the hinge point as the axis. The pushing connecting rod 63 drives the drill needle rod mounting block 64 and the drill needle alignment rod 65 to move towards the thimble 22 until the end of the drill needle alignment rod 65 abuts against the drill needle. After the processing is completed, the controller controls the pulling cylinder 62 to return to its original position, driving the drill needle alignment rod 65 to separate from the drill needle, which is convenient for the manipulator of the precision grinder to pick up and unload the workpiece.

[0034] The drill needle alignment rod 65 is installed on the side of the drill needle away from the processing surface. That is, during the grinding process of the precision grinder, the grinding wheel of the precision grinder and the drill needle alignment rod 65 are located on both sides of the drill needle respectively. This enables the drill needle alignment rod 65 to play a role in resisting the drill needle during processing, preventing the drill needle from bending sideways and ensuring the concentricity between the drill needle and the rod material. Since the drill needle is always in a rotating state during processing, to improve the processing stability and extend the service life of the drill needle alignment rod 65, a second wear-resistant block 66 is provided on the end face of the drill needle alignment rod 65 close to the thimble 22. The second wear-resistant block 66 is fixedly connected to the drill needle alignment rod 65, and the second wear-resistant block 66 abuts against the drill needle during operation. The second wear-resistant block 66 is made of polycrystalline diamond material and has good wear resistance.

[0035] The straightening fixed block 61 is provided with an adjustment mechanism, which is used to adjust the pushing stroke of the push link 63, thereby changing the abutment force of the drill straightening rod 65 on the drill; the adjustment mechanism includes an adjustment fixed block 67, which is fixedly connected to the straightening fixed block 61 by screws, and a micrometer 68 is provided on the adjustment fixed block 67. When the pulling cylinder 62 drives the push link 63 to move, the screw of the micrometer 68 can abut against one end of the push link 63 close to the pulling cylinder 62, thereby limiting the movement stroke of the push link 63. The micrometer 68 can use a screw micrometer without a frame in the prior art, and a scale is provided on the ruler, and the adjustment accuracy can reach 0.01 mm. When it is necessary to reduce the contact force of the drill needle straightening rod 65 on the drill needle, the user can twist the micrometer 68 to make the screw extend out of the ruler body, that is, the extended length of the screw increases, and the push-link rod 63 is limited by the screw of the micrometer 68 when it swings, so that the movement stroke of the push-link rod 63 is shortened, that is, the forward moving distance of the drill needle straightening rod 65 is also shortened, so that the contact force of the drill needle straightening rod 65 on the drill needle is reduced; conversely, retracting the screw into the ruler body can expand the movement stroke of the push-link rod 63, thereby increasing the contact force of the drill needle straightening rod 65 on the drill needle.

[0036] The drill needle straightening rod 65 and the straightening rod mounting block 64 are connected in an adjustable manner in order to facilitate the adjustment of the contact position and strength between the drill needle straightening rod 65 and the drill needle.

[0037] Specifically, a long strip slot 641 is provided on the straightening rod mounting block 64, and a first limiting screw 642 is provided on the long strip slot 641. The first limiting screw 642 is connected to the pushing link 63. By tightening the first limiting screw 642, the straightening rod mounting block 64 and the pushing link 63 are limited and fixed; an adjusting screw 643 is provided on one side of the straightening rod mounting block 64, and the adjusting screw 643 is adjustably threadedly connected to the straightening rod mounting block 64, and the end face of the adjusting screw 643 abuts against the pushing link 63; when it is necessary to adjust the installation position of the straightening rod mounting block 64, the user can loosen the first limiting screw 642, and then rotate the adjusting screw 643 to make the first limiting screw 642 slide on the long strip slot 641, thereby changing the installation position of the straightening rod mounting block 64 on the pushing link 63. After reaching the appropriate position, the first limiting screw 642 can be tightened again.

[0038] The upright rod mounting block 64 is provided with a first through hole 644 and a second through hole 645. The first through hole 644 communicates with the second through hole 645, and the first through hole 644 and the second through hole 645 are vertically distributed. An elevation adjustment block 69 is arranged in the first through hole 644. The elevation adjustment block 69 is in clearance fit with the first through hole 644. A second limit screw 646 is arranged on the upright rod mounting block 64. The end face of the second limit screw 646 abuts against the side wall of the elevation adjustment block 69. A third through hole 691 is arranged in the elevation adjustment block 69. The drill needle upright rod 65 sequentially passes through the second through hole 645 and the third through hole 691. The drill needle upright rod 65 is in clearance fit with the third through hole 691. A third limit screw 692 is arranged on the elevation adjustment block 69. The end face of the third limit screw 692 abuts against the drill needle upright rod 65. The inner diameter of the second through hole 645 is larger than the outer diameter of the drill needle upright rod 65, so that the drill needle upright rod 65 can swing up and down in the second through hole 645. When adjustment is needed, the user can loosen the second limit screw 646, and the elevation adjustment block 69 can rotate in the first through hole 644, thereby driving the drill needle upright rod 65 to swing up and down in the second through hole 645, so as to adjust the installation angle of the drill needle upright rod 65. Loosen the third limit screw 692, and the drill needle upright rod 65 can slide in the second through hole 645, thereby adjusting the length of the drill needle upright rod 65 extending out of the upright rod mounting block 64, so as to change the abutting force of the drill needle upright rod 65 against the drill needle. In order to facilitate the adjustment of the drill needle upright rod 65, a handle 610 is arranged at one end of the drill needle upright rod 65 away from the second wear-resistant block 66. The handle 610 is fixedly connected to the drill needle upright rod 65, which is convenient for the user to manually adjust.

[0039] Working principle:

[0040] When the bar stock clamping guide wheel mechanism is feeding, the controller controls the ejector cylinder 21 to work, pushing the ejector pin 22 to rise. The manipulator of the precision grinder places the bar stock on the ejector pin 22. Then the controller controls the ejector cylinder 21 to reset, driving the ejector pin 22 and the bar stock to descend to the processing position. When the sensor 23 detects that the bar stock on the ejector pin 22 is in place, it feeds back a signal to the controller. At this time, the first wear-resistant block 53 and the guide wheel 33 are respectively in contact with the side wall of the bar stock. Then, the controller controls the pressure wheel cylinder 41 to work. The pressure wheel cylinder 41 works to push the push rod 42 to swing around the hinge point through the connecting rod 43, thereby pushing the pressure wheel 44 to move towards the guide wheel 33 until the pressure wheel 44 abuts against the side wall of the bar stock on the ejector pin 22.

[0041] During processing, the controller controls the pulling cylinder 62 and the driving motor 31 to work respectively. When the pulling cylinder 62 works, it drives the pushing connecting rod 63 to swing around the hinge point. The pushing connecting rod 63 drives the drill needle mounting block 64 and the drill needle aligning rod 65 to move towards the direction close to the thimble 22 until the second wear-resistant block 66 abuts against the drill needle. When the driving motor 31 works, it drives the transmission shaft 32 to rotate. The transmission shaft 32 drives the guide wheel 33 to rotate synchronously. The guide wheel 33 drives the bar stock to rotate in place and drives the pressure wheel 44 to rotate together with the bar stock. The precision grinding machine grinds the drill needle. The drill needle aligning rod 65 abuts against the drill needle to prevent the drill needle from bending sideways.

[0042] After processing is completed, the controller controls the pressure wheel cylinder 41 and the pulling cylinder 62 to work. The pressure wheel cylinder 41 drives the pressure wheel 44 to move away from the guide wheel 33, so that the pressure wheel 44 is separated from the bar stock. The pulling cylinder 62 drives the drill needle aligning rod 65 to move away from the thimble 22, so that the drill needle aligning rod 65 is separated from the drill needle. Then, the controller controls the ejector cylinder 21 to work, pushing the thimble 22 and the processed product to rise. The manipulator of the precision grinding machine takes away the processed product from the thimble 22.

[0043] Obviously, the embodiments described above are only a part of the embodiments of the present application, rather than all of them. The accompanying drawings show the preferred embodiments of the present application, but do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent substitution on some of the technical features. Any equivalent structure directly or indirectly using the content of the specification and drawings of the present application in other related technical fields is similarly within the scope of the patent protection of the present application.

Claims

1. A bar clamping and guiding wheel mechanism for a fine grinding machine, characterized in that: It includes a fixed seat, on which there are a bar stock placement mechanism, a guide wheel mechanism, and a pressure wheel limiting mechanism. The bar stock placement mechanism is used to place the bar stock to be processed. The guide wheel mechanism is used to drive the bar stock to be processed to rotate. The pressure wheel limiting mechanism is used to limit the bar stock to be processed on the bar stock placement mechanism; The guide wheel mechanism includes a rotation driving mechanism and a guide wheel. The rotation driving mechanism is connected to the fixed seat, and the output end of the rotation driving mechanism is connected to the guide wheel. The rotation driving mechanism is used to drive the guide wheel to rotate; The rotation driving mechanism includes a driving motor and a transmission shaft. The driving motor is connected to the fixed seat. One end of the transmission shaft is connected to the guide wheel, and the other end of the transmission shaft is connected to the output end of the driving motor; The pressure wheel limiting mechanism includes a pressure wheel cylinder and a push rod. The pressure wheel cylinder and the push rod are respectively connected to the fixed seat. One end of the push rod is connected to the output end of the pressure wheel cylinder, and a pressure wheel is provided at the other end of the push rod. The pressure wheel is rotatably and limitably connected to the push rod; The bar stock placement mechanism includes a jacking cylinder and a jacking pin. The jacking cylinder is connected to the fixed seat, and the jacking pin is connected to the output end of the jacking cylinder.

2. The bar clamping and guide wheel mechanism for a fine grinding machine according to claim 1, wherein: A bar stock straightening mechanism is provided on the fixed seat. The bar stock straightening mechanism includes a base and a straightening adjustment block. The base is connected to the fixed seat, and the straightening adjustment block is adjustably and limitably connected to the base. A first wear-resistant block is provided at one end of the straightening adjustment block.

3. The bar clamping and guiding wheel mechanism for a precision grinder according to claim 2, characterized in that: A slot adapted to the straightening adjustment block is provided on the base. The straightening adjustment block is limited in the slot. An internal thread hole is provided on the slot, and a kidney-shaped hole is provided on the straightening adjustment block. The kidney-shaped hole and the internal thread hole are connected by a screw.

4. The bar clamping and guiding wheel mechanism for a fine grinding machine according to claim 3, wherein: An adjustment screw is provided at the end of the straightening adjustment block away from the first wear-resistant block. The adjustment screw is adjustably threadedly connected to the straightening adjustment block. The other end of the adjustment screw is connected to the base. An elastic member is sleeved on the adjustment screw, and the two ends of the elastic member are respectively connected to the base and the straightening adjustment block.

5. The bar clamping and guiding wheel mechanism for a fine grinding machine according to any one of claims 1 or 3-4, characterized in that: A drill bit straightening mechanism is provided on the fixed seat. The drill bit straightening mechanism is used to correct the concentricity between the bar stock and the drill bit. The drill bit straightening mechanism includes a straightening fixed block. The straightening fixed block is connected to the fixed seat. A straightening pushing mechanism is provided on the straightening fixed block. A drill bit straightening rod is provided on the straightening pushing mechanism. The straightening pushing mechanism is used to push the drill bit straightening rod to abut against the drill bit.

6. The bar clamping and guiding wheel mechanism for a fine grinding machine according to claim 5, wherein: The straightening pushing mechanism includes a pulling cylinder, a pushing connecting rod, and a straightening rod mounting block. The pulling cylinder is connected to the straightening fixed block. The middle of the pushing connecting rod is hinged to the straightening fixed block. One end of the pushing connecting rod is connected to the output end of the pulling cylinder, and the other end of the pushing connecting rod is connected to the straightening rod mounting block. The drill bit straightening rod is adjustably and limitably connected to the straightening rod mounting block.

7. The bar clamping and guiding wheel mechanism for a precision grinding machine according to claim 6, characterized in that: The upright fixing block is provided with an adjusting mechanism for adjusting the pushing stroke of the pushing connecting rod. The adjusting mechanism includes an adjusting fixed block connected to the upright fixing block. The adjusting fixed block is provided with a micrometer, and the screw of the micrometer can abut against one end of the pushing connecting rod close to the pulling cylinder.

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