Automatic knife locking device

Abstract

The present invention relates to the technical field of numerical control machine tools, and in particular to an automatic tool locking device, comprising a knife arm with a knife claw and a knife locking assembly, the knife locking assembly comprising a push rod, a push block elastically lifted in the knife arm and used for pushing the push rod toward the knife tool, and a lifting and lowering driving mechanism for driving the push block to lift and lower, the lifting and lowering driving mechanism comprising a rotatable turntable and a lower plate supported below the turntable, the bottom surface of the lower plate being an unlocking surface, the turntable protruding downward to form a lower protrusion, the outer edge of the lower plate being recessed to form a receiving groove for accommodating the lower protrusion and allowing it to rotate, and during the rotation of the lower protrusion, its side wall and the groove wall of the receiving groove enclose a locking groove for accommodating the elastically reset push block so that the push block moves up and pushes the push rod; the present invention utilizes the mutual cooperation between the turntable and the lower plate to form a locking groove for the push block to enter, and then the tool is locked by the cooperation between the push block and the push rod to change the tool, thereby avoiding the occurrence of tool falling and improving the strength of the knife arm clamping the tool.

Description

Technical Field

[0001] The invention relates to the technical field of numerically controlled machine tools, and in particular to an automatic tool locking device. Background Art

[0002] With the continuous development of industry, CNC machine tools are becoming more powerful and their precision is constantly improving. The molding process of a single part often involves multiple processing techniques such as boring, milling, cutting, cutting, drilling, etc. The tools required for various processes are different, so it is necessary to change tools in time during the processing. In the prior art, an automatic tool changing mechanism is usually used to transfer the tools in the tool magazine to the spindle. However, when changing tools, the tool usually falls off, resulting in interruption of the processing process and reducing the processing efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in order to solve the problem that the automatic tool changing mechanism in the prior art usually drops the tool when changing the tool, resulting in interruption of the processing process and reduced processing efficiency, an automatic tool locking device is now provided.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: an automatic knife locking device, comprising a knife arm with a knife claw and a knife locking assembly for locking a knife in the knife claw;

[0005] The knife locking assembly includes a push rod for supporting the knife to lock the knife, a push block elastically lifted in the knife arm and used to push the push rod toward the knife, and a lifting drive mechanism for driving the push block to lift and lower, the push block is provided with a pushing inclined surface, and the push rod is provided with a matching inclined surface matching the pushing inclined surface;

[0006] The lifting drive mechanism includes a rotatable turntable and a lower plate supported under the turntable, the bottom surface of the lower plate is an unlocking surface for pressing down a push block to separate the push rod from the tool, the turntable protrudes downward to form a lower protrusion, the outer edge of the lower plate is recessed to form a receiving groove for accommodating the lower protrusion and allowing it to rotate, and during the rotation of the lower protrusion, its side wall and the groove wall of the receiving groove are surrounded to form a locking groove for accommodating an elastically reset push block so that the push block moves upward to push the push rod.

[0007] Furthermore, an abutment block is formed on the outer wall of the turntable in a radial direction, and an abutment pin is installed on the knife arm for abutting against the abutment block to drive the turntable to rotate along the first direction.

[0008] Furthermore, an upper plate is provided above the turntable, and an installation cavity is formed between the upper plate and the lower plate. A first elastic member is installed in the installation cavity for driving the turntable to rotate along the second direction to reset the lower protrusion after the abutment pin shaft is separated from the abutment block.

[0009] Furthermore, a first positioning ring is formed on the central portion of the lower plate protruding toward the upper plate, and a second positioning ring for cooperating with the first positioning ring is formed on the upper plate protruding toward the lower plate.

[0010] Furthermore, the outer edge of the second positioning ring is recessed to form a mounting groove, the inner wall of the turntable is protruding to form an inner convex block, and one end of the first elastic member is connected to the groove wall of the mounting groove, and the other end is connected to the inner convex block.

[0011] Furthermore, the push block includes a push column formed with the above-mentioned push inclined surface and a locking pin located at the top of the push column to cooperate with the locking groove.

[0012] Furthermore, a top cover is provided above the upper plate, and a central portion of the top cover protrudes toward the upper plate to form a third positioning ring that cooperates with the second positioning ring.

[0013] Furthermore, the automatic knife locking device also includes a mounting seat and a rotary drive mechanism for driving the knife arm to lift and rotate, a rotating shaft is connected between the output end of the rotary drive mechanism and the knife arm, and the top cover is fixedly connected to the mounting seat.

[0014] Furthermore, the top cover is provided with an inserting portion for inserting into the interior of the mounting seat, and the inserting portion is in a cone shape that is smaller at the top and larger at the bottom.

[0015] Furthermore, a second elastic member is sleeved on the push rod, one end of the second elastic member is connected to the first step surface on the push rod, and the other end is connected to the second step surface in the knife arm.

[0016] Beneficial effects of the present invention: The present invention utilizes the cooperation between the turntable and the lower plate to form a locking groove for the push block to enter, and then the push block cooperates with the push rod to lock the tool and then change the tool, thereby avoiding the occurrence of tool falling and improving the strength of the tool arm clamping the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 is a three-dimensional schematic diagram of the present invention;

[0019] Figure 2 is a three-dimensional schematic diagram of the present invention without the mounting seat;

[0020] Figure 3 yes Figure 2 A partial enlarged view of part A;

[0021] Figure 4 It is an exploded diagram of the lifting drive structure;

[0022] Figure 5 is a bottom view of the present invention;

[0023] Figure 6 yes Figure 5 Cross-sectional view in the BB direction;

[0024] Figure 7 yes Figure 6 A partial enlarged view of part C.

[0025] In the figure:

[0026] 1. knife arm; 101. knife claw; 102. abutment pin; 103. second step surface;

[0027] 2. ejector pin; 201. matching inclined surface; 202. first step surface; 203. second elastic member;

[0028] 3. Push block; 301. Pushing inclined surface; 302. Pushing column; 303. Lock pin; 304. Third elastic member;

[0029] 4. Lifting drive mechanism; 401. Lower plate; 4011. Unlocking surface; 4012. First positioning ring; 402. Turntable; 4021. Lower convex block; 4022. Inner convex block; 4023. Locking groove; 4024. Abutment block; 403. Upper plate; 4031. Second positioning ring; 4032. Mounting groove; 404. Top cover; 4041. Third positioning ring; 4042. Insertion portion; 405. First elastic member;

[0030] 5. Mounting seat;

[0031] 6. Rotation drive mechanism; 601. Rotating shaft;

[0032] 7. Cutting tools. DETAILED DESCRIPTION

[0033] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner only, and therefore only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0034] like Figure 1-Figure 7 As shown, an automatic knife locking device comprises a knife arm 1 having a knife claw 101 and a knife locking assembly for locking a knife 7 in the knife claw 101;

[0035] The knife locking assembly includes a push rod 2 for holding the tool 7 to lock the tool 7, a push block 3 elastically lifted in the knife arm 1 and used to push the push rod 2 toward the tool 7, and a lifting drive mechanism 4 for driving the push block 3 to lift and lower. The push block 3 is provided with a pushing inclined surface 301, and the push rod 2 is provided with a matching inclined surface 201 that matches the pushing inclined surface 301. The pushing inclined surface 301 and the matching inclined surface 201 are both inclined from top to bottom toward the direction of the tool 7. The tool 7 and the lifting drive mechanism 4 are respectively located on both sides of the push rod 2. The push rod 2 can move laterally under the action of the lifting drive mechanism 4 to hold the tool 7;

[0036] The lifting drive mechanism 4 includes a rotatable turntable 402 and a lower plate 401 supported under the turntable 402, the bottom surface of the lower plate 401 is an unlocking surface 4011 for pressing down the push block 3 to make the push rod 2 disengage from the tool 7; the turntable 402 protrudes downward to form a lower protrusion 4021, and the lower protrusion 4021 is flush with the bottom surface of the lower plate 401, and the outer edge of the lower plate 401 is recessed to form a receiving groove for accommodating the lower protrusion 4021 and allowing it to rotate, and during the rotation of the lower protrusion 4021, its side wall and the groove wall of the receiving groove are surrounded to form a locking groove 4023 for accommodating the elastically reset push block 3 so that the push block 3 moves up to push the push rod 2, and the groove width of the receiving groove is not less than the sum of the widths of the lower protrusion 4021 and the locking groove 4023.

[0037] In the initial state, there is no tool 7 in the tool claw 101, the unlocking surface 4011 is in a continuous contact state with the push block 3, and the push block 3 is in the lower limit position, and does not apply a thrust to the push rod 2;

[0038] When the tool needs to be changed, the tool arm 1 rotates, and the two tool claws 101 thereon rotate toward the direction of the main shaft and the tool magazine respectively to transfer the tool 7 of the main shaft and the tool magazine to the inside, and when it rotates to a certain position, the turntable 402 starts to rotate, and the lower protrusion 4021 rotates synchronously, and the original position of the lower protrusion 4021 is vacated to form the above-mentioned locking groove 4023, and the rotating push block 3 disengages from the unlocking surface 4011 and produces elastic reset and moves upward into the locking groove 4023. During its upward movement, the push rod 2 is driven to move in the direction of the tool 7 through the cooperation of the pushing inclined surface 301 and the matching inclined surface 201 to support the tool 7 in the tool claw 101 and thereby lock the tool 7.

[0039] In some examples, the outer wall of the turntable 402 is radially protruded to form an abutment block 4024, and the knife arm 1 is equipped with an abutment pin 102 for abutting against the abutment block 4024 to drive the turntable 402 to rotate along the first direction. A spring is provided at the bottom of the abutment pin 102, which can be raised and lowered under the action of the spring force; during the rotation of the knife arm 1, when the abutment pin 102 abuts against the abutment block 4024, the turntable 402 can be driven to rotate, and the lower protrusion 4021 rotates synchronously, and the original position of the lower protrusion 4021 is vacated to form the above-mentioned locking groove 4023.

[0040] In some examples, an upper plate 403 is provided above the turntable 402, and an installation cavity is enclosed between the upper plate 403 and the lower plate 401. A first elastic member 405 is installed in the installation cavity for driving the turntable 402 to rotate in a second direction opposite to the first direction after the abutment pin 102 is disengaged from the abutment block 4024 to reset the lower protrusion 4021. At this time, the lower protrusion 4021 blocks the locking groove 4023.

[0041] In some examples, a first positioning ring 4012 is formed at the center of the lower plate 401 protruding toward the upper plate 403, and a second positioning ring 4031 is formed on the upper plate 403 protruding toward the lower plate 401 for cooperating with the first positioning ring 4012. The first positioning ring 4012 is clamped on the inner side of the second positioning ring 4031 to achieve initial positioning of the two, and then the lower plate 401 and the upper plate 403 are locked by bolts.

[0042] In some examples, the outer edge of the second positioning ring 4031 is recessed to form a mounting groove 4032, the inner wall of the turntable 402 is protruding to form an inner protrusion 4022, one end of the first elastic member 405 is connected to the groove wall of the mounting groove 4032, and the other end is connected to the inner protrusion 4022. When the abutment pin shaft 102 abuts against the abutment block 4024 to drive the turntable 402 to rotate along the first direction, the first elastic member 405 is compressed. When the abutment pin shaft 102 is disengaged from the abutment block 4024, the first elastic member 405 is reset to drive the turntable 402 to rotate along the second direction.

[0043] In some examples, the push block 3 includes a pushing column 302 formed with the above-mentioned pushing slope 301 and a locking pin 303 located at the top of the pushing column 302 to cooperate with the locking groove 4023, the cross-sectional area of ​​the locking pin 303 is smaller than the cross-sectional area of ​​the pushing column 302, and a third elastic member 304 is provided at the bottom of the pushing column 302.

[0044] In some examples, a top cover 404 is provided above the upper plate 403, and a central portion of the top cover 404 protrudes toward the upper plate 403 to form a third positioning ring 4041 that cooperates with the second positioning ring 4031. The third positioning ring 4041 is clamped on the inner side of the second positioning ring 4031 to achieve initial positioning of the two, and then the lower plate 401, the upper plate 403 and the top cover 404 are fixed by bolts.

[0045] In some examples, the automatic knife locking device also includes a mounting seat 5 and a rotating drive mechanism 6 for driving the knife arm 1 to rise and fall and rotate. A rotating shaft 601 is connected between the output end of the rotating drive mechanism 6 and the knife arm 1, and the top cover 404 is fixedly connected to the mounting seat 5.

[0046] In some examples, the top cover 404 is provided with a plug-in portion 4042 for inserting into the interior of the mounting base 5, and a plug-in hole is provided at the bottom of the mounting base 5. The plug-in portion 4042 is a cone with a small top and a large bottom, and the cone structure is easy to insert into the plug-in hole.

[0047] In some examples, a second elastic member 203 is sleeved on the push rod 2, one end of the second elastic member 203 is connected to the first step surface 202 on the push rod 2, and the other end is connected to the second step surface 103 in the knife arm 1; when the push block 3 moves upward and pushes the push rod 2 to move in the direction of the tool 7 to lock the tool 7, the second elastic member 203 is stretched; when the push block 3 moves downward, the push block 3 loses the thrust on the push rod 2, and the second elastic member 203 is reset to drive the push rod 2 to move in the direction away from the tool 7.

[0048] Working principle:

[0049] In the initial state, there is no tool 7 in the knife claw 101, the unlocking surface 4011 and the locking pin 303 are in a continuous contact state, the third elastic member 304 is compressed, and the push block 3 is in the lower limit position, and does not apply a thrust to the push rod 2;

[0050] When the tool needs to be changed, the tool arm 1 rotates, and the two tool claws 101 thereon rotate toward the direction of the main shaft and the tool magazine respectively to transfer the tool 7 of the main shaft and the tool magazine to the inside, and when the tool arm 1 rotates to a certain position, the abutment pin shaft 102 abuts against the abutment block 4024 to drive the turntable 402 to rotate, and the lower protrusion 4021 rotates synchronously, and the original position of the lower protrusion 4021 is vacated to form a locking groove 4023, and the locking pin 303 gradually disengages from the unlocking surface 4011 during the rotation process and faces the locking groove 4023, and it moves upward into the locking groove 4023 under the elastic force of the third elastic member 304, and in the process of moving upward, the push rod 2 is driven toward the tool 7 through the cooperation of the pushing inclined surface 301 and the matching inclined surface 201. The tool 7 in the knife claw 101 is moved in the direction of rotation to support the knife 7 in the knife claw 101, thereby locking the knife 7. Then the rotating shaft 601 drives the knife arm 1 to move downward and away from the lower plate 401, and the locking pin 303 disengages from the locking groove 4023. At the same time, the lower protrusion 4021 is reset under the elastic force of the first elastic member 405, and the rotating shaft 601 drives the knife arm 1 to rotate 180° to exchange the positions of the knives 7 in the two knife claws 101. Then the knife arm 1 moves upward toward the lower plate 401, the locking pin 303 abuts against the unlocking surface 4011, and the push block 3 moves downward to unlock the knife 7. The tool 7 in the knife claw 101 is transferred to the spindle and the tool magazine respectively. Finally, the rotating shaft 601 drives the knife arm 1 to rotate to make the knife claw 101 away from the spindle, and the spindle starts to work.

[0051] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An automatic knife locking device, characterized in that: It comprises a knife arm (1) having a knife claw (101) and a knife locking assembly for locking a knife (7) in the knife claw (101); The knife locking assembly comprises a push rod (2) for supporting the knife (7) to lock the knife (7), a push block (3) elastically raised and lowered in the knife arm (1) and used to push the push rod (2) toward the knife (7), and a lifting drive mechanism (4) for driving the push block (3) to rise and fall, the push block (3) being provided with a pushing inclined surface (301), and the push rod (2) being provided with a matching inclined surface (201) matching with the pushing inclined surface (301); The lifting drive mechanism (4) comprises a rotating disk (402) which is rotatably arranged and a lower disk (401) supported below the rotating disk (402); the bottom surface of the lower disk (401) is an unlocking surface (4011) for pressing down the push block (3) so that the push rod (2) is separated from the tool (7); the rotating disk (402) protrudes downward to form a lower protrusion (4021); the outer edge of the lower disk (401) is recessed to form a receiving groove for accommodating the lower protrusion (4021) and allowing it to rotate; during the rotation of the lower protrusion (4021), the side wall of the lower protrusion (4021) and the groove wall of the receiving groove enclose a locking groove (4023) for accommodating the elastically reset push block (3) so that the push block (3) moves upward to push the push rod (2); An abutment block (4024) is formed on the outer wall of the rotating disk (402) in a radially protruding manner, and an abutment pin shaft (102) is mounted on the knife arm (1) for abutting against the abutment block (4024) to drive the rotating disk (402) to rotate in a first direction.

2. The automatic knife locking device according to claim 1, characterized in that: An upper plate (403) is provided above the rotating plate (402), and an installation cavity is formed between the upper plate (403) and the lower plate (401). A first elastic member (405) is installed in the installation cavity and is used to drive the rotating plate (402) to rotate in a second direction to reset the lower protrusion (4021) after the abutment pin (102) and the abutment block (4024) are disengaged.

3. The automatic knife locking device according to claim 2, characterized in that: A first positioning ring (4012) is formed on the central portion of the lower plate (401) protruding in the direction of the upper plate (403), and a second positioning ring (4031) is formed on the upper plate (403) protruding in the direction of the lower plate (401) for cooperating with the first positioning ring (4012).

4. The automatic knife locking device according to claim 3, characterized in that: The outer edge of the second positioning ring (4031) is recessed to form a mounting groove (4032), the inner wall of the rotating disk (402) is protruding to form an inner convex block (4022), and one end of the first elastic member (405) is connected to the groove wall of the mounting groove (4032), and the other end is connected to the inner convex block (4022).

5. The automatic knife locking device according to claim 1, characterized in that: The push block (3) comprises a push column (302) formed with the above-mentioned push inclined surface (301) and a lock pin (303) located at the top of the push column (302) to cooperate with the locking groove (4023).

6. The automatic knife locking device according to claim 3, characterized in that: A top cover (404) is provided above the upper plate (403), and a central portion of the top cover (404) protrudes in the direction of the upper plate (403) to form a third positioning ring (4041) that cooperates with the second positioning ring (4031).

7. The automatic knife locking device according to claim 6, characterized in that: The automatic knife locking device further comprises a mounting seat (5) and a rotary drive mechanism (6) for driving the knife arm (1) to rise and fall and to rotate, a rotating shaft (601) being connected between an output end of the rotary drive mechanism (6) and the knife arm (1), and the top cover (404) being fixedly connected to the mounting seat (5).

8. The automatic knife locking device according to claim 7, characterized in that: The top cover (404) is provided with an inserting portion (4042) for inserting into the interior of the mounting seat (5), and the inserting portion (4042) is in a conical shape that is smaller at the top and larger at the bottom.

9. The automatic knife locking device according to claim 1, characterized in that: A second elastic member (203) is sleeved on the push rod (2); one end of the second elastic member (203) is connected to the first step surface (202) on the push rod (2), and the other end is connected to the second step surface (103) in the knife arm (1).

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