A hob loading mechanism and a hob grinding machine

Abstract

The present invention provides a hob feeding mechanism and a hob grinding machine. The hob feeding mechanism is used to install a hob with a shaft hole in the center onto a positioning shaft, and the positioning shaft is driven by a positioning shaft driving member to move forward and backward along its axial direction. Among them, the hob feeding mechanism includes a radial transfer assembly and an axial tightening assembly; among them, the radial transfer assembly is configured to clamp the hob and transfer the hob to the axis of the positioning shaft, so that the shaft hole of the hob is aligned with the positioning shaft; the positioning shaft driving member is configured to drive the positioning shaft to move forward along its axial direction to pre-insert into the shaft hole of the hob; the axial tightening assembly is configured to drive the hob to move along the axial direction of the positioning shaft to tightly fit the hob onto the positioning shaft by interference fit after the positioning shaft and the hob are pre-inserted; the positioning shaft is configured to be driven by the hob interference-fitted thereon to rotate around its axis. The hob feeding mechanism provided by the present invention can realize automatic feeding of the hob, and has a high degree of automation.

Description

Technical Field

[0001] The present invention relates to the technical field of automated grinding equipment, and particularly to a hob loading mechanism and a hob grinding machine. Background Art

[0002] A hob is a cutting tool that realizes cutting during the process of rotating in relative contact with the workpiece to be cut. Usually, the hob is in a cylindrical shape, and cutting edges are formed on its peripheral wall, and the cutting edges are often in a spiral shape. After the cutting edges are formed, they usually need to be polished to increase their sharpness. Since the cutting edges of the hob are usually in a spiral shape, it is difficult to polish them. The prior art usually uses a hand-held electric grinding wheel to travel along the helical cutting edge for polishing; or uses a hand-held or semi-automatic tooling to clamp the hob and rotate the hob to make the helical cutting edge travel on the electric grinding wheel for polishing. However, in the prior art, the accuracy of traveling along the helical cutting edge during hob polishing is low, the polishing efficiency is low, and the risk is high.

[0003] In view of this, it is necessary to propose a new technical solution to overcome the problems existing in the prior art. Summary of the Invention

[0004] The present invention provides a hob loading mechanism and a hob grinding machine, which can realize automatic loading of the hob and have a high degree of automation.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A hob loading mechanism is used to install a hob with a shaft hole in the center onto a positioning shaft, and the positioning shaft is driven by a positioning shaft driving member to move forward and backward along its axial direction. Among them, the hob loading mechanism includes a radial transfer assembly and an axial tightening assembly; among them,

[0006] The radial transfer assembly is configured to clamp the hob and transfer the hob to the axis of the positioning shaft, so that the shaft hole of the hob is aligned with the positioning shaft;

[0007] The positioning shaft driving member is configured to drive the positioning shaft to move forward along its axial direction to be pre-inserted into the shaft hole of the hob;

[0008] The axial tightening assembly is configured to drive the hob to move along the axial direction of the positioning shaft after the positioning shaft and the hob are pre-inserted, so as to tightly fit the hob onto the positioning shaft by interference fit;

[0009] The positioning shaft is configured to be driven by the hob that is interference-fitted on it to rotate around its axis.

[0010] Optionally, the positioning shaft includes an equal-diameter section with a constant diameter and a variable-diameter section connected to the equal-diameter section and having a gradually increasing diameter. The equal-diameter section of the positioning shaft is pre-inserted into the shaft hole of the hob, and the axial tightening assembly drives the hob to be interference-fitted with the variable-diameter section of the positioning shaft.

[0011] Optionally, the radial transfer assembly includes a sliding seat, a clamping member mounted on the sliding seat for clamping the hob, and a first driving member for driving the sliding seat and the clamping member mounted thereon to move synchronously in the radial direction of the positioning shaft.

[0012] Optionally, the clamping member is connected with an elastic reset member, the elastic reset member applies a force to the clamping member to keep the clamping member in the initial position, and the clamping member is configured to be movable relative to the sliding seat on either side of the initial position in the axial direction of the positioning shaft.

[0013] Optionally, a guiding shaft is provided between the clamping member and the sliding seat, and the elastic reset member is sleeved on the guiding shaft.

[0014] Optionally, a sensing element is mounted on the clamping member, and a detecting element cooperating with the sensing element is mounted on the sliding seat, and the detecting element cooperates with the sensing element to detect whether the clamping member moves away from the initial position.

[0015] Optionally, the cooperation between the detecting element and the sensing element is configured as follows: when the clamping member is pushed by the pre-insertion movement of the positioning shaft and deviates from the initial position, the detecting element and the sensing element are misaligned compared with the initial position, triggering an alarm and a stop feeding instruction.

[0016] Optionally, the axial tightening assembly includes a second driving assembly mounted on the sliding seat, and the second driving assembly pushes the clamping member to move from the initial position in a direction opposite to the movement direction when the positioning shaft is pre-inserted to tighten the hob on the positioning shaft.

[0017] Optionally, the second driving assembly includes a second driving member and a wedge-shaped rod, a wedge-shaped block is provided on the clamping member, the second driving member pushes the wedge-shaped rod to move, and the wedge-shaped rod pushes the wedge-shaped block to drive the clamping member to move.

[0018] Optionally, the structures of the two ends of the hob are different, the clamping member has a clamping cavity for accommodating the hob, the clamping cavity is configured with a detection cavity that can accommodate one end of the hob but cannot accommodate the other end of the hob, and a detector for detecting whether the end of the hob enters the detection cavity is arranged in the detection cavity.

[0019] Optionally, the positioning shaft driving member includes a driving shaft sleeved outside one end of the positioning shaft, the positioning shaft and the driving shaft are relatively fixed in the axial direction, and the positioning shaft can rotate relative to the driving shaft around the axis.

[0020] Optionally, a radially penetrating limiting hole is provided on the side wall of the driving shaft, and an annular groove corresponding to the limiting hole is provided on the positioning shaft. A limiting member is installed in the limiting hole and protrudes into the annular groove to limit the relative displacement between the positioning shaft and the driving shaft in the axial direction.

[0021] Optionally, balls are further provided inside the driving shaft, and the balls abut against the end face of the positioning shaft.

[0022] The present invention also provides a hob grinding machine, which includes the hob loading mechanism as described in any one of the above.

[0023] The hob loading mechanism provided by the present invention can realize the radial transfer, pre-insertion positioning and axial tightening of the hob through the actions of the radial transfer assembly, the positioning shaft driving member, and the axial tightening assembly. The positioning shaft is configured to be driven by the hob sleeved thereon with interference fit to rotate around its axis. In this way, automatic loading of the hob can be realized, and the positioning effect between the loaded hob and the positioning shaft is good. During grinding, the positioning shaft is driven to rotate by the hob, rather than the positioning shaft actively applying force to drive the hob to rotate. Its rotation path during grinding is more accurate and the grinding effect is good. The hob grinding machine provided by the present invention includes the above-mentioned hob loading mechanism and of course has the above-mentioned beneficial effects. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention and do not limit the present invention.

[0025] Figure 1 is a perspective view of an embodiment of the hob grinding machine of the present invention.

[0026] Figure 2 is a perspective view of the internal structure of an embodiment of the hob grinding machine of the present invention.

[0027] Figure 3 is a top view of the internal structure of an embodiment of the hob grinding machine of the present invention.

[0028] Figure 4 is a perspective view of the hob loading mechanism in an embodiment of the hob grinding machine of the present invention.

[0029] Figure 5 is a perspective combined view of the components for realizing hob positioning in an embodiment of the hob grinding machine of the present invention.

[0030] Figure 6 is Figure 5 a perspective exploded view of a part of the components shown in.

[0031] Figure 7 is Figure 5 a partial cross-sectional view of the first positioning assembly in.

[0032] Figure 8 It is a three-dimensional view of a grinding wheel in an embodiment of the hob grinding machine of the present invention.

[0033] Figure 9 It is a three-dimensional view of a hob blanking mechanism in an embodiment of the hob grinding machine of the present invention.

[0034] Figure 10 It is a three-dimensional view of a hob suitable for grinding by the hob grinding machine of the present invention.

[0035] Reference numerals: 100 - hob grinding machine; 1 - positioning shaft driving member; 11 - driving shaft; 110 - limiting hole; 111 - ball; 12 - positioning shaft; 120 - annular groove; 121 - equal-diameter section; 122 - variable-diameter section; 123 - concave hole; 14 - slide table; 15 - positioning rod; 151 - tip; 16 - stepped shaft; 17 - workbench; 2 - hob loading mechanism; 21 - conveying pipe; 22 - clamping member; 221 - wedge block; 23 - wedge rod; 24 - sliding seat; 251 - detection element; 252 - induction element; 261 - first driving member; 262 - second driving member; 27 - elastic reset member; 3 - pre-positioning ejector rod; 4 - indexing ejector rod; 5 - circumferential positioning assembly; 51 - floating positioning member; 511 - roller; 512 - movable connecting member; 513 - floating guide rod; 514 - fixed connecting seat; 52 - fixed positioning member; 521 - fixed guide rod; 6 - hob blanking mechanism; 61 - guide rail; 610 - front port; 611 - bottom wall; 612 - side wall; 6121 - stop portion; 613 - notch; 614 - rear port; 62 - conveyor belt assembly; 621 - rack driving cylinder; 622 - rack; 623 - driving gear; 624 - driven wheel; 625 - conveyor belt; 63 - tail stop member; 65 - third driving member; 7 - grinding wheel; 8 - hob; 801 - shaft hole; 81 - cutting edge; 82 - cutting valley. Detailed implementation manners

[0036] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0037] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] Unless otherwise defined, technical terms or scientific terms used in this patent document shall have the ordinary meanings understood by those of ordinary skill in the art to which this invention pertains. The terms "first", "second" and similar words used in the description of this invention patent specification and claims do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a", "an" or "the" do not denote a quantity limitation, but mean that there is at least one. Words such as "comprising" or "including" mean that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. Terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly. It is only for the convenience of describing this invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on this invention.

[0039] In the description of this invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this invention can be understood according to specific circumstances.

[0040] The following will describe in detail some embodiments of this invention with reference to the accompanying drawings. Without conflict, the features in the following embodiments can be combined with each other.

[0041] Please refer to Figures 1 to 10 As shown, this invention provides a hob loading mechanism 2 and a hob grinding machine 100. The hob grinding machine 100 is used for grinding hobs 8, and can realize automatic loading, precise positioning, automatic grinding and automatic unloading of the hobs 8. The hob grinding machine 100 includes a workbench 17, a grinding wheel 7, a hob loading mechanism 2, a positioning component for positioning the hob 8 during grinding, and a hob unloading mechanism 6 for removing the ground hob 8. It can be understood that the naming of the hob loading mechanism 2, the positioning component and the hob unloading mechanism 6 is a general description based on the action process achieved by the overall cooperation of multiple components or structures. The components included in the hob loading mechanism 2, the positioning component and the hob unloading mechanism 6 are not necessarily different, and may include one or more identical components or structures. The following will describe the hob grinding machine 100 of this application in detail.

[0042] First, the structure of the hob 8 ground by the hob grinding machine 100 applicable to the present invention will be described. Please refer to Figure 10 As shown, the hob 8 is a cylinder, with a shaft hole 801 provided at its center. On the circumferential wall surface thereof, there are several helical cutting edges 81 arranged at intervals. Between adjacent cutting edges 81, there are formed helical blade valleys 82. Both the cutting edges 81 and the blade valleys 82 extend simultaneously along the axial direction and the circumferential direction of the hob 8. In this embodiment, each of the helical cutting edges 81 is a helix less than one turn, and even a helix less than half a turn. The two ends of the hob 8 have different shapes and sizes, and the hob 8 needs to be fed in a specific direction during loading.

[0043] Next, please refer to Figures 1 to 4 The hob loading mechanism 2 of the hob grinding machine 100 of the present application and the hob loading process will be introduced. The hob loading mechanism 2 is used to mount the hob 8 onto the positioning shaft 12. The positioning shaft 12 is driven by a positioning shaft driving member 1 to move forward and backward along its axial direction. The hob loading mechanism 2 includes a radial transfer assembly and an axial tightening assembly. The radial transfer assembly is arranged beside the positioning shaft 12 in the axial direction of the positioning shaft 12, and is configured to clamp the hob 8 and transfer the hob 8 radially to the axis of the positioning shaft 12, so that the shaft hole 801 of the hob 8 is aligned with the positioning shaft 12. The positioning shaft driving member 1 is configured to drive the positioning shaft 12 to move forward along its axial direction to pre-insert into the shaft hole 801 of the hob 8. The axial tightening assembly is configured to drive the hob 8 to move along the axial direction of the positioning shaft 12 to tightly fit the hob 8 onto the positioning shaft 12 by interference fit after the positioning shaft 12 and the hob 8 are pre-inserted. The positioning shaft 12 is configured to be driven by the hob 8 interference-fitted thereon to rotate around its axis.

[0044] Please refer to Figure 7As shown, the positioning shaft 12 includes an equal-diameter section 121 with a constant diameter and a variable-diameter section 122 connected to the equal-diameter section 121 and with a gradually increasing diameter. During the process of loading the hob, the positioning shaft driving member 1 drives the positioning shaft 12 to move axially so that the equal-diameter section 121 of the positioning shaft 12 is pre-inserted into the shaft hole 801 of the hob 8. Then, the axial clamping assembly drives the hob 8 to further perform interference fit with the variable-diameter section 122 of the positioning shaft 12 to be clamped on the positioning shaft 12. That is, starting from the end of the positioning shaft 12 for the hob 8 to be sleeved inwards, it successively includes an equal-diameter section 121 and a variable-diameter section 122; the clamping of the positioning shaft 12 and the hob 8 requires two sleeving actions. The first sleeving action is the movement of the positioning shaft 12. At this time, the equal-diameter section 121 of the positioning shaft 12 is inserted into the shaft hole 801 of the hob 8. The diameter of the equal-diameter section 121 is slightly smaller than the diameter of the shaft hole 801 so that the two are in clearance or transition fit. This fit mainly plays a role of pre-insertion positioning and does not yet play a role of circumferentially fixing the two. The second sleeving action is the movement of the hob 8. At this time, the hob 8 is sleeved on the variable-diameter section 122. Since the diameter of the variable-diameter section 122 gradually increases, the hob 8 is sleeved tighter and tighter. The fit on the variable-diameter section 122 mainly plays a role of making the two relatively fixed circumferentially and preventing relative rotation between the two.

[0045] Please continue to refer to Figure 7 As shown, the positioning shaft driving member 1 includes a driving shaft 11 sleeved outside one end of the positioning shaft 12. The positioning shaft 12 and the driving shaft 11 are relatively fixed axially, and the positioning shaft 12 can rotate around the axis relative to the driving shaft 11. A radially penetrating limiting hole 110 is provided on the side wall of the driving shaft 11, and an annular groove 120 corresponding to the limiting hole 110 is provided on the positioning shaft 12. A limiting member that protrudes into the annular groove 120 to limit the relative displacement of the positioning shaft 12 and the driving shaft 11 in the axial direction is installed in the limiting hole 110. The limiting member is, for example, a screw, a pin, etc. A ball 111 is also provided inside the driving shaft 11. The ball 111 abuts against the end face of the positioning shaft 12. The setting of the ball 111 makes the rotation of the positioning shaft 12 relative to the driving shaft 11 smoother. After the hob 8 is clamped on the positioning shaft 12, the positioning shaft 12 needs to rotate synchronously with the hob 8 to implement subsequent grinding processes. In this embodiment, the positioning shaft 12 is driven to rotate passively by the hob 8.

[0046] Please refer to Figures 2 to 4 As shown, the radial transfer assembly includes a sliding seat 24, a clamping member 22 installed on the sliding seat 24 for clamping the hob 8, and a first driving member 261 for driving the sliding seat 24 and the clamping member 22 installed thereon to move synchronously in the radial direction of the positioning shaft 12.

[0047] After the hob 8 is regularized by the regularization mechanism, they are arranged in sequence along the axial direction of the hob 8 in the conveying pipe 21 and are conveyed one by one into the clamping member 22. The structures of both ends of the hob 8 are different. The clamping member 22 has a clamping cavity for accommodating the hob 8, and the clamping cavity is configured with a detection cavity that can accommodate one end of the hob 8 but not the other end. A detector for detecting whether the end of the hob 8 enters the detection cavity is arranged in the detection cavity. If the end of the hob 8 is not detected to enter the detection cavity of the clamping member 22, it is determined that the feeding direction of the hob 8 is incorrect, and then an alarm is given and the feeding is stopped. Specifically, the two ends of the hob 8 can be set such that the diameter of one end is larger than that of the other end. The detection cavity is set to have a size larger than the smaller-diameter end of the hob 8 and smaller than the larger-diameter end of the hob 8. In this way, when the hob 8 feeds forward with the smaller-diameter end, it can be fed in place, and when it feeds forward with the larger-diameter end, it cannot be fed in place. When the detector detects this situation, it can give an alarm and stop the feeding.

[0048] The clamping member 22 is connected with an elastic reset member 27. The elastic reset member 27 applies a force to the clamping member 22 to keep the clamping member 22 in the initial position. The clamping member 22 is configured to be movable relative to the sliding seat 24 in the axial direction of the positioning shaft 12 to either side of the initial position. A guiding shaft is arranged between the clamping member 22 and the sliding seat 24. The clamping member 22 slides on the sliding seat 24 along the guiding shaft, and the elastic reset member 27 is sleeved on the guiding shaft. In this embodiment, the elastic reset member 27 is two springs, which are arranged on the left and right sides of the clamping member 22. When the clamping member 22 is moved to one side by an external force, the spring on that side is compressed, and the compressed spring provides a restoring force to return the clamping member 22 to the initial position when no external force is applied.

[0049] The clamping member 22 is arranged to be movable to either side of the initial position. Accordingly, whether the feeding process of the hob 8 is normal can be judged according to the movement condition of the clamping member 22. Specifically, an induction element 252 is installed on the clamping member 22, and a detection element 251 cooperating with the induction element 252 is installed on the sliding seat 24. The detection element 251 and the induction element 252 cooperate to detect whether the clamping member 22 moves away from the initial position. Among them, the cooperation between the detection element 251 and the induction element 252 is configured as follows: when the clamping member 22 is pushed by the pre-insertion movement of the positioning shaft 12 and deviates from the initial position, the detection element 251 and the induction element 252 are misaligned compared with the initial position, triggering an alarm and a stop feeding instruction. Please refer to Figure 4 As shown, after the clamping member 22 clamps the hob 8 and radially moves to the axis of the positioning shaft 12, the positioning shaft driving member 1 drives the positioning shaft 12 to move forward along its axial direction, that is, towards Figure 4The rightward movement indicated therein. When the position of the shaft hole 801 of the hob 8 is directly opposite the axis of the positioning shaft 12 and the size of the shaft hole 801 matches the size of the positioning shaft 12, the pre-insertion action of the positioning shaft 12 will not push the clamping member 22 that holds the hob 8 to move to the right, which means the pre-insertion action during the feeding process is normal. When there is a deviation between the position of the shaft hole 801 of the hob 8 and the axis of the positioning shaft 12, or when the aperture of the shaft hole 801 of the hob 8 is too small due to machining dimensional errors, the positioning shaft 12 cannot be inserted into the shaft hole 801 during pre-insertion, and thus the rightward movement of the positioning shaft 12 will push the clamping member 22 that holds the hob 8 to move to the right, which means the pre-insertion action during feeding is abnormal; at this time, the detection element 251 and the sensing element 252 are misaligned, and it is determined that the pre-insertion action of the positioning shaft 12 is abnormal, then an alarm and a stop feeding instruction are triggered.

[0050] Please continue to refer to Figure 4 As shown, the clamping member 22 is arranged to be movable to the left of the initial position, and is used to drive the clamping member 22 to drive the hob 8 to move axially to the left along the positioning shaft 12 to be tightly sleeved with the positioning shaft 12 after the pre-insertion action. Specifically, the axial tightening assembly includes a second driving assembly installed on the sliding seat 24, and the second driving member pushes the clamping member 22 to move in a direction opposite to the movement direction when the positioning shaft 12 is pre-inserted from the initial position to tightly sleeve the hob 8 on the positioning shaft 12. The second driving assembly includes a second driving member 262 and a wedge rod 23. A wedge block 221 is provided on the clamping member 22. The second driving member 262 pushes the wedge rod 23 to move, and the wedge rod 23 pushes the wedge block 221 to drive the clamping member 22 to move. The cooperation between the detection element 251 and the sensing element 252 can also be used to detect whether the tightening action is normal. Specifically, when the second driving assembly drives the clamping member 22 to move to the left, if there is an offset caused by the leftward movement between the detection element 251 and the sensing element 252, it is determined that the tightening action is normal; if there is no offset caused by the leftward movement or the offset amount is less than the preset value between the detection element 251 and the sensing element 252, it is determined that the tightening action is abnormal, and then an alarm is issued and the feeding is stopped.

[0051] Next, refer to Figure 2 、 Figure 3 、 Figures 5 to 7Introduce the positioning process of the hob 8 by the hob grinding machine 100 during the grinding process. The hob grinding machine 100 includes a workbench 17, a grinding wheel 7, as well as a first positioning component and a second positioning component. The first positioning component is configured to position the hob 8 in the axial direction of the positioning shaft 12 to form an axial positioning state. In this axial positioning state, the hob 8 can rotate around its axis; the second positioning component is configured to position the hob 8 in the circumferential direction of the positioning shaft 12 to form a circumferential positioning state. In this circumferential positioning state, the hob 8 can maintain the contact between its cutting edge 81 and the grinding wheel 7 to grind the cutting edge 81 along the extension direction of the cutting edge 81. Among them, the first positioning component is engaged with the workbench 17 in a manner that can reciprocate in the axial direction, and the second positioning component is engaged with the workbench 17 in a manner that is stationary relative to the workbench 17 in the axial direction.

[0052] The first positioning component includes a slide table 14, a positioning shaft 12, and a positioning rod 15. The slide table 14 is arranged on the workbench 17 through a sliding structure; the positioning shaft 12 is arranged on the slide table 14 and can move along with the slide table 14; the positioning rod 15 is arranged on the slide table 14 and can move along with the slide table 14. The positioning shaft 12 is as described above, and it is configured to be able to rotate around its axis. The hob 8 is detachably sleeved on the positioning shaft 12 and can drive the positioning shaft 12 to rotate. The positioning rod 15 has an end that abuts against the positioning shaft 12, and this abutment is set to limit the radial movement of the positioning shaft 12 while allowing the positioning shaft 12 to rotate. By the positioning rod 15 abutting against the positioning shaft 12, the problem that the positioning shaft 12 has a large flexibility due to one end being suspended and is prone to radial offset during the grinding process can be avoided, so that the position accuracy of the positioning shaft 12 is higher, and thus the grinding accuracy of the hob 8 sleeved on it is high. Specifically, a concave hole 123 is provided on the end face of the positioning shaft 12 that abuts against the positioning rod 15, and the end of the positioning rod 15 is a tip 151 inserted into the concave hole 123.

[0053] The second positioning component is a circumferential positioning component 5 for achieving circumferential positioning. It includes a floating positioning member 51, which is configured to move upward to a height opposite to the front end of the blade groove 82 before being inserted into the blade groove 82 of the hob 8, and move downward to a height in contact with the inner bottom surface of the blade groove 82 after being inserted into the blade groove 82. The setting of the second positioning component can convert the translational motion of the hob 8 into the rotational motion of the hob 8. It needs to maintain continuous contact with one of the two groove side walls of the blade groove 82, otherwise, it cannot provide the external force for the rotation of the hob 8. If contact is maintained immediately when the second positioning component is inserted into the blade groove 82 through the front end of the blade groove 82, it will make the insertion fit difficult and may cause the second positioning component not to be inserted into the blade groove 82. In this embodiment, by setting the upward and downward movements of the floating positioning member 51, the above problems are overcome. Further, the floating positioning member 51 is tightly pulled by an elastic member to be in close contact with the inner bottom surface of the blade groove 82. In one embodiment, a roller 511 is connected to the bottom of the floating positioning member 51. The hob grinding machine 100 includes a stepped shaft 16 that reciprocates horizontally. When the thick section of the stepped shaft 16 is inserted below the roller 511, it drives the floating positioning member 51 to move upward, and when the thin section of the stepped shaft 16 is inserted below the roller 511, the floating positioning member 51 moves downward; it can be understood that in order to make the upward and downward movements of the roller 511 smooth, the thick section and the thin section of the stepped shaft 16 are connected by a frustum-shaped transition section. The floating positioning member 51 includes a floating guide rod 513, a fixed connection seat 514, and a movable connection member 512. The floating guide rod 513 is fixed to the upper end of the movable connection member 512, the roller 511 is installed at the lower end of the movable connection member 512, and the movable connection member 512 is pivotally connected to the fixed connection seat 514. The stepped shaft 16 drives the roller 511, the movable connection member 512, and the floating guide rod 513 to reciprocally rotate within a certain angle range above and below the pivotal position relative to the fixed connection seat 514 to achieve floating. Further, the stepped shaft 16 and the positioning rod 15 are fixed to the same slide 14. During the grinding process, the positioning shaft 12, the positioning rod 15, and the stepped shaft 16 move synchronously. In another embodiment, the upward and downward movements can also be achieved through the cooperation structure of a push rod and a wedge body. Specifically, a wedge body is connected to the bottom of the floating positioning member 51, and the hob grinding machine 100 includes a push rod that reciprocates horizontally to push against the wedge body.

[0054] The second positioning component further includes a fixed positioning member 52. In the circumferential positioning state, the fixed positioning member 52 is vertically inserted into a blade valley 82 of the hob 8, and the floating positioning member 51 is horizontally inserted into another blade valley 82 of the hob 8. Specifically, the fixed positioning member 52 includes a fixed guide rod 521 which is inserted into a blade valley 82 of the hob 8, and the floating guide rod 513 of the floating positioning member 51 is inserted into another blade valley 82 of the hob 8. By positioning with two positioning members, one floating and one fixed, in two blade valleys 82, the positioning of the hob 8 is more reliable, enabling the cutting edge 81 of the hob 8 to maintain contact with the grinding wheel 7 and travel along the extension direction of the cutting edge 81.

[0055] Please refer to Figure 2 , Figure 3 and Figure 5 As shown, the hob grinding machine 100 further includes an indexing ejector rod 4. Before grinding each cutting edge 81, the hob 8 needs to be positioned by the indexing ejector rod 4 to a position where a cutting edge 81 to be ground is facing the grinding surface of the grinding wheel 7. The indexing ejector rod 4 abuts within the blade valley 82, and the positioning shaft 12 drives the hob 8 to feed axially. The feeding hob 8 is driven by the relative sliding of the indexing ejector rod 4 within the blade valley 82 to rotate by the indexing of one cutting edge 81, so as to achieve sequential grinding of each cutting edge 81.

[0056] The hob grinding machine 100 further includes a pre-positioning ejector rod 3. The working position of the pre-positioning ejector rod 3 is in front of the working position of the indexing ejector rod 4. The pre-positioning ejector rod 3 is configured to push the hob 8 to rotate to adjust the initial angle of the hob 8. Since the circumferential state of the hob 8 is uncertain when it is transported from the conveying pipe 21 to the clamping member 22. For example, when the hob 8 is sleeved and fixed on the positioning shaft 12, the position on the circumferential surface of the hob 8 facing the indexing ejector rod 4 may be a cutting edge 81, or a blade valley 82, or a position above or below the blade valley 82. Therefore, a pre-positioning ejector rod 3 is provided to push the hob 8 to drive the positioning shaft 12 to rotate by an angle, so that the initial state of the hob 8 fed to the indexing ejector rod 4 is the same, to ensure the accuracy of subsequent grinding. In this embodiment, the pre-positioning ejector rod 3 pushes the hob 8 in an inclined upward manner, facilitating driving the hob 8 to rotate.

[0057] Please continue to refer to Figure 2 , Figure 3 and Figure 5As shown, the grinding process of the hob 8 is as follows: After the above-mentioned feeding and positioning, the hob 8 reciprocates on the sliding table 14. Driven by the second positioning component, the movement of the hob 8 is a rotational movement along the extension direction of the cutting edge 81 while translating axially. During this movement process, the grinding wheel 7 contacts and grinds the cutting edge 81 of the hob 8, and one reciprocating movement completes the grinding of one cutting edge 81; when the hob 8 moves to the corresponding position of the indexing ejector rod 4, the indexing ejector rod 4 abuts against the wall surface of the hob 8 to drive the hob 8 to rotate by the indexing of one cutting edge 81 during each abutment; then continue to move in the above-mentioned manner to realize the grinding of another cutting edge 81; repeat this process until all the cutting edges 81 are ground, then the hob 8 can be removed, and then the feeding and grinding of the next hob 8 can be carried out.

[0058] The following refers to Figure 2 , Figure 3 and Figure 9 to introduce the hob blanking mechanism 6 and the blanking process. The hob blanking mechanism 6 is used to remove the ground hob 8 that is interference-fitted on the positioning shaft 12. The hob blanking mechanism 6 includes a guide rail 61 and a third driving member 65 for driving the movement of the guide rail 61. The guide rail 61 has a front port 610 for accommodating the hob 8 in a horizontal state, and a stop portion 6121 that blocks the end of the hob 8 is provided at the front port 610. When the positioning shaft 12 drives the hob 8 to move backward along the axis of the positioning shaft 12, the end of the hob 8 impacts the stop portion 6121 so that the hob 8 falls off the positioning shaft 12 and enters the guide rail 61. The guide rail 61 includes a bottom wall 611 and side walls 612, and the bottom wall 611 and the side walls 612 enclose a "U" shape. A notch 613 for avoiding the positioning shaft 12 is provided on the side wall 612 at the front port 610. The part of the side wall 612 around the notch 613 at the front port 610 forms the stop portion 6121.

[0059] Furthermore, the width of the guide rail 61 is equivalent to the axial length of the hob 8, so that the hob 8 can roll in the guide rail 61 and is not prone to turning. The equivalence includes that the width of the guide rail 61 is equal to or slightly greater than the axial length of the hob 8. In a specific embodiment, the width of the guide rail 61 is greater than the axial length of the hob 8 and less than the axial diagonal length of the hob 8. The guide rail 61 is inclined downward from the front port 610 to the rear port 614 opposite to the front port 610, so that the hob 8 can roll down by gravity.

[0060] Further, the hob blanking mechanism 6 further includes a tail stopper 63 disposed at the rear port 614 of the guide rail 61. The lower end of the tail stopper 63 forms an opening, and the hob 8 rolling downward along the guide rail 61 is blocked by the tail stopper 63 and drops from the opening. The hob blanking mechanism 6 further includes a conveyor belt assembly 62. The conveyor belt assembly 62 is located below the opening, and the hob 8 drops from the opening onto the conveyor belt assembly 62. The conveyor belt assembly 62 includes a driving assembly and a conveyor belt 625. The driving assembly drives the conveyor belt 625 to move step by step. The so-called step-by-step movement means a movement that alternates between movement, stop, movement, and stop. Specifically, the driving assembly includes a rack driving cylinder 621, a rack 622, a driving gear 623, and a driven wheel 624. The rack driving cylinder 621 drives the rack 622 to reciprocate. The rack 622 meshes with the driving gear 623. A ratchet structure is configured inside the driving gear 623, so that the forward rotation of the driving gear 623 drives the driven wheel 624 and the conveyor belt 625 to move, and the reverse rotation of the driving gear 623 does not drive the driven wheel 624 and the conveyor belt 625 to move.

[0061] After all the cutting edges 81 of a hob 8 are ground, the positioning shaft 12 drives the hob 8 to move to a position opposite to the guide rail 61. The guide rail 61 is driven to move obliquely upward, so that part of the hob 8 is located inside the guide rail 61. The guide rail 61 is a strip-shaped groove in a "U" shape with a bottom wall 611 and side walls 612. After the guide rail 61 moves obliquely upward in place, the positioning shaft 12 moves backward. At this time, the end face of the hob 8 impacts against the side wall 612 of the guide rail 61 and then falls off the positioning shaft 12 and rolls down along the guide rail 61. Blocked by the tail stopper 63, it drops onto the conveyor belt 625. The conveyor belt 625 is driven by the combination of the driving gear 623 and the rack 622. The rack 622 is driven by the rack driving cylinder 621 to move back and forth. The driving gear 623 cooperates with the rack 622 and is driven by the reciprocating rack 622 to perform an alternating movement of forward rotation and reverse rotation. When the driving gear 623 rotates in reverse, it does not drive the driven wheel 624 to rotate. In this way, the step-by-step transmission of the conveyor belt 625 can be realized, that is, it moves forward for a certain distance and stops. When the ground hob 8 drops onto the conveyor belt 625, it moves forward for a certain distance and stops again, waiting for the next ground hob 8 to drop onto the conveyor belt 625.

[0062] As can be seen from the above description, the hob loading mechanism 2 provided by the present invention can achieve the radial transfer, pre-insertion positioning, and axial clamping of the hob 8 through the actions of the radial transfer assembly, the positioning shaft driving member, and the axial clamping assembly. Thus, automatic loading of the hob can be realized, and the positioning effect between the loaded hob 8 and the positioning shaft is good; the positioning shaft 12 is configured to be driven to rotate around its axis by the hob 8 sleeved thereon with interference fit. During grinding, the positioning shaft 12 is driven to rotate by the hob 8, rather than the positioning shaft 12 actively applying force to drive the hob 8 to rotate. Its rotation path during grinding is more accurate and the grinding effect is good. The hob grinding machine 100 provided by the present application can achieve automatic loading, automatic grinding, and automatic unloading of the hob 8, and can realize fully automatic grinding of the hob 8.

[0063] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A hob feeding mechanism for installing a hob with a shaft hole in the center onto a positioning shaft, wherein the positioning shaft is driven by a positioning shaft driving member to move axially forward and backward, and is characterized in that, The hob loading mechanism includes a radial transfer component and an axial clamping component; wherein, The radial transfer component is configured to clamp the hob and transfer the hob to the axis of the positioning shaft, so that the shaft hole of the hob is aligned with the positioning shaft; the radial transfer component includes a sliding seat, a clamping member installed on the sliding seat for clamping the hob, and a first driving member for driving the sliding seat and the clamping member installed thereon to move synchronously along the radial direction of the positioning shaft; The positioning shaft driving member is configured to drive the positioning shaft to move forward axially to pre-insert into the shaft hole of the hob; The axial clamping component is configured to drive the hob to move backward along the axis of the positioning shaft to press-fit the hob onto the positioning shaft after the positioning shaft and the hob are pre-inserted; the axial clamping component includes a second driving component installed on the sliding seat, and the second driving component pushes the clamping member to move from the initial position in the direction opposite to the movement direction when the positioning shaft is pre-inserted to clamp the hob onto the positioning shaft; the second driving component includes a second driving member and a wedge rod, a wedge block is provided on the clamping member, the second driving member pushes the wedge rod to move, and the wedge rod pushes the wedge block to drive the clamping member to move; The positioning shaft is configured to be driven by the hob press-fitted thereon to rotate around its axis.

2. The hob feeding mechanism according to claim 1, characterized in that, The positioning shaft includes an equal-diameter section with a constant diameter and a variable-diameter section connected to the equal-diameter section and with a gradually increasing diameter. The equal-diameter section of the positioning shaft is pre-inserted into the shaft hole of the hob, and the axial clamping component drives the hob to be press-fitted with the variable-diameter section of the positioning shaft.

3. The hob feeding mechanism according to claim 1, characterized in that, The clamping member is connected with an elastic resetting member, and the elastic resetting member applies force to the clamping member so that the clamping member is maintained at the initial position. The clamping member is configured to be movable relative to the sliding seat on either side of the initial position in the axial direction of the positioning shaft.

4. The hob feeding mechanism according to claim 3, characterized in that, A guiding shaft is provided between the clamping member and the sliding seat, and the elastic resetting member is sleeved on the guiding shaft.

5. The hob feeding mechanism according to claim 3, characterized in that, An induction element is installed on the clamping member, and a detection element cooperating with the induction element is installed on the sliding seat. The detection element cooperates with the induction element to detect whether the clamping member moves away from the initial position.

6. The hob feeding mechanism according to claim 5, characterized in that, The cooperation between the detection element and the induction element is configured as follows: when the clamping member is pushed by the pre-insertion movement of the positioning shaft and deviates from the initial position, the detection element and the induction element are misaligned compared with the initial position, triggering an alarm and a stop loading instruction.

7. The hob feeding mechanism according to claim 1, characterized in that, The structures of the two ends of the hob are different. The clamping member has a clamping cavity for accommodating the hob, and the clamping cavity is configured with a detection cavity that can accommodate one end of the hob but not the other end. A detector for detecting whether the end of the hob enters the detection cavity is configured in the detection cavity.

8. The hob feeding mechanism according to claim 1, characterized in that, The positioning shaft driving member includes a driving shaft sleeved outside one end of the positioning shaft. The positioning shaft and the driving shaft are relatively fixed in the axial direction, and the positioning shaft can rotate relative to the driving shaft around the axis.

9. The hob feeding mechanism according to claim 8, characterized in that, A limiting hole penetrating radially is provided on the side wall of the driving shaft, an annular groove corresponding to the limiting hole is provided on the positioning shaft, and a limiting member is installed in the limiting hole and protrudes into the annular groove to limit the relative displacement of the positioning shaft and the driving shaft in the axial direction.

10. The hob feeding mechanism according to claim 8, characterized in that, The driving shaft further includes balls which abut against the end face of the positioning shaft.

11. A hob grinding machine, characterized in that, It includes a hob loading mechanism according to any one of claims 1 to 10.

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