Wire cutting mechanism for thread insert machine

Abstract

The utility model relates to the technical field of thread insert machining, and particularly discloses a thread cutting mechanism for a thread insert machine, which comprises a driving motor, a fixed tool apron and a movable tool, the fixed tool apron is used for being connected with an external thread insert machine, the movable tool is rotationally arranged on the fixed tool apron, the movable tool is provided with a first cutter used for shearing a wire rod, the fixed tool apron is provided with a second cutter used in cooperation with the first cutter, and the wire cutting mechanism further comprises a cam connected with the driving motor. The central axis of the cam and the central axis of the output shaft of the driving motor do not coincide, and a strip-shaped notch used for being arranged on the outer side of the cam in a sleeving mode is formed in the end, away from the first cutter, of the movable cutter. The driving motor drives the movable cutter to swing in a reciprocating mode relative to the fixed cutter holder through the cam so that the first cutter and the second cutter can clamp and cut off wires on the thread insert machine. The mechanism is reasonable in design, compact in structure and convenient to install and maintain, and the automation degree and the production efficiency of the thread insert machine are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field, and in particular discloses a thread cutting mechanism for a screw threading machine. Background Art

[0002] In the thread insert machine process, accurate and efficient wire cutting is a key step in ensuring product quality and production efficiency. However, when the thread insert machine is used to make certain thread insert products, two cutters need to move relative to each other to perform the cutting action. This structural design not only requires two sets of drive mechanisms, but also tends to occupy a large amount of workspace, which is not conducive to the integrated design of the thread insert machine. In addition, the process of installing the cutters is cumbersome, which reduces the production efficiency of the thread insert machine. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a tangent mechanism for a screw thread machine to solve the above technical problems.

[0004] To achieve the above-mentioned purpose, the utility model provides a tangent mechanism for a screw threading machine, comprising a driving motor, a fixed knife seat, and a movable tool; the fixed knife seat is used to connect to an external screw threading machine, and the movable tool is rotatably arranged on the fixed knife seat, the movable tool is provided with a first cutter for shearing wire, and the fixed knife seat is provided with a second cutter used in conjunction with the first cutter. The tangent mechanism also includes a cam connected to the driving motor, the central axis of the cam and the central axis of the output shaft of the driving motor do not coincide with each other, and the end of the movable tool away from the first cutter is provided with a long strip notch for being sleeved on the outside of the cam; the driving motor drives the movable tool to swing back and forth relative to the fixed knife seat via the cam so that the first cutter and the second cutter clamp and cut the wire on the screw threading machine.

[0005] Furthermore, the driving motor is a servo motor, and the tangent mechanism also includes a reducer connected to the driving motor. The cam has a transmission shaft, which is connected to the output shaft of the reducer. The central axis of the transmission shaft does not coincide with the central axis of the output shaft of the reducer. The driving motor drives the cam to rotate eccentrically via the reducer.

[0006] Furthermore, a needle bearing is rotatably provided on the outer side of the cam, and the strip-shaped notch is arranged in a racetrack shape, and the strip-shaped notch is sleeved on the outer side of the needle bearing.

[0007] Furthermore, the fixed knife seat is provided with a pivot shaft, the movable knife is provided with a pivot hole that rotates with the pivot shaft, and the movable knife is rotatably connected to the fixed knife seat via the pivot shaft.

[0008] Furthermore, a stop protrusion is provided at one end of the pivot shaft close to the movable tool, and the stop protrusion has a first arc segment concentric with the pivot shaft and a first stop plane, and an end of the movable tool close to the pivot hole is provided with a stop groove connected to the pivot hole, and a second stop plane is provided on the inner side of the stop groove for blocking and interfering with the first stop plane, and the stop groove is used to accommodate the stop protrusion, and the stop groove has a second arc segment concentric with the pivot hole, the radius of the second arc segment is larger than the radius of the first arc segment, and the area of ​​the second stop plane is larger than the area of ​​the first stop plane.

[0009] Furthermore, the first cutter is provided with a first tenon, the movable tool is provided with a first slot for accommodating the first tenon, and two first limiting plates are detachably connected to the movable tool, and the two first limiting plates are respectively located at the two ends of the first slot, and the first limiting plates are used to stop and interfere with the first tenon in the first slot to limit the first cutter on the movable tool.

[0010] Furthermore, two stop blocks are provided on the fixed tool holder, and the two stop blocks are respectively located on both sides of the movable tool. Both stop blocks are provided with fastening bolts, and a flexible buffer portion is provided at one end of the fastening bolt close to the movable tool.

[0011] Furthermore, the second cutter is provided with a second tenon, and the fixed knife seat is provided with a second slot for accommodating the second tenon. Two second limiting plates are detachably connected to the fixed knife seat, and the two second limiting plates are respectively located at the two ends of the second slot. The second limiting plates are used to stop and interfere with the second tenon in the second slot to limit the second cutter on the fixed knife seat.

[0012] Furthermore, the free end of the first cutter is provided with a first blade portion for cutting wire rods, and the free end of the second cutter is provided with a second blade portion for use with the first blade portion, and the first blade portion and the second blade portion are arranged alternately.

[0013] Furthermore, the tangent mechanism also includes a support seat, which is arranged in an "L" shape. The fixed knife seat is detachably connected to one end of the support seat, and the other end of the support seat is reciprocatingly arranged on the external screw threading machine.

[0014] Furthermore, a movable plate is provided at the bottom of the fixed knife seat, and the movable plate is set on the support seat for reciprocating movement. The moving direction of the movable plate is cross-set with the moving direction of the support seat. The movable plate is provided with two arc-shaped holes for accommodating external bolt fasteners, and the movable plate is detachably connected to the bottom of the fixed knife seat via external bolt fasteners.

[0015] The present invention's tangent mechanism for a thread inserter utilizes a drive motor to rotate a cam, which in turn drives a movable cutter to swing back and forth on a fixed cutter holder. This mechanism achieves alternating clamping and shearing between the first and second cutters, effectively shearing the wire on the thread inserter. Its unique feature is the use of a cam mechanism to achieve power conversion and transmission, ensuring precise and efficient shearing. Furthermore, a speed reducer reduces torque and increases torque in the drive motor, ensuring stable shearing force output. This mechanism features a rational design, a compact structure, and ease of installation and maintenance, significantly improving the automation and production efficiency of the thread inserter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the tangent mechanism of the present invention;

[0017] Figure 2 This is a schematic diagram of the exploded structure of the tangent mechanism of the present invention;

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the fixed tool holder and the movable tool of the utility model;

[0019] Figure 4 This is a schematic diagram of the exploded structure of the fixed tool holder and the movable tool of the present invention;

[0020] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of part A.

[0021] Reference numerals include:

[0022] 1. Driving motor; 2. Fixed knife holder; 3. Movable knife; 4. Cam; 5. Reducer; 6. Support seat; 7. Moving plate; 8. Fixed plate; 20. Induction switch; 21. Second cutter; 211. Second tenon; 22. Pivot shaft; 221. Stop protrusion; 222. First arc segment; 223. First stop plane; 23. Second notch; 24. Second limiting plate; 25. Stop block; 26. Fastening bolt; 31. First cutter; 311. First tenon; 32. Strip notch; 33. Pivot hole; 331. Stop groove; 332. Second arc segment; 333. Second stop plane; 34. First notch; 35. First limiting plate; 41. Transmission shaft; 42. Needle roller bearing. DETAILED DESCRIPTION

[0023] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0024] See also Figures 1 to 5As shown, the utility model is a tangent mechanism for a screw threading machine, comprising a driving motor 1, a fixed knife seat 2, and a movable tool 3; the fixed knife seat 2 is used to connect to an external screw threading machine, and the movable tool 3 is rotatably set on the fixed knife seat 2, and the movable tool 3 is provided with a first cutter 31 for shearing wire, and the fixed knife seat 2 is provided with a second cutter 21 used in conjunction with the first cutter 31. The tangent mechanism also includes a cam 4 connected to the driving motor 1, the central axis of the cam 4 and the central axis of the output shaft of the driving motor 1 do not coincide with each other, and the end of the movable tool 3 away from the first cutter 31 is provided with a strip notch 32 for being sleeved on the outside of the cam 4; the driving motor 1 drives the movable tool 3 to swing back and forth relative to the fixed knife seat 2 via the cam 4 so that the first cutter 31 and the second cutter 21 clamp and cut the wire on the screw threading machine.

[0025] In this embodiment, the drive motor 1 is a servo motor. The bottom of the fixed blade holder 2 is a cube with a hollowed-out center. The upper portion of the fixed blade holder 2 can be mounted with a second cutter 21. When in use, the fixed blade holder 2 can be directly connected to a screw threading machine. The movable cutter 3 is rotatably connected to the upper center of the fixed blade holder 2. The groove of the cam 4 closely matches the cam 4 to reduce the gap between operations and improve the accuracy of shearing. A PLC is used to control the start and stop and speed of the servo motor. The fixed blade holder 2 is provided with a sensor switch 20 connected to the PLC controller. The sensor switch 20 is used to detect the position of the wire, thereby ensuring synchronization and accuracy during cutting.

[0026] Specifically, the tangent mechanism also includes a reducer 5 connected to the drive motor 1, and the cam 4 has a transmission shaft 41, which is connected to the output shaft of the reducer 5. The central axis of the transmission shaft 41 does not coincide with the central axis of the output shaft of the reducer 5. The drive motor 1 drives the cam 4 to rotate eccentrically via the reducer 5.

[0027] Combined with the high speed and low torque characteristics of the motor, the function of the reducer 5 is to reduce the speed and increase the output torque. The output shaft of the reducer 5 is connected to the transmission shaft 41, but the central axes of the two do not coincide. This design allows the cam 4 to rotate in a specific eccentric manner while transmitting power. The cam 4 then transmits power to the movable tool 3, and the movable tool 3 produces a linear swing away from the end of the first cutter 31, thereby driving the first cutter 31 to move back and forth relative to the second cutter 21 to achieve the function of cutting the wire.

[0028] Specifically, a needle roller bearing 42 is rotatably mounted on the outer side of the cam 4, and the strip-shaped notches 32 are arranged in a racetrack pattern, sleeved on the outer side of the needle roller bearing 42. This structural design means that rolling friction is adopted between the cam 4 and the supporting structure, reducing wear and improving movement efficiency. At the same time, the racetrack-shaped notches 32 provide better guidance, making the mating components move more smoothly.

[0029] Specifically, the fixed knife seat 2 is provided with a pivot shaft 22 , and the movable knife 3 is provided with a pivot hole 33 rotatably matched with the pivot shaft 22 . The movable knife 3 is rotatably connected to the fixed knife seat 2 via the pivot shaft 22 .

[0030] Specifically, a stop protrusion 221 is provided at one end of the pivot shaft 22 close to the movable tool 3, and the stop protrusion 221 has a first arc segment 222 and a first stop plane 223 which are concentric with the pivot shaft 22. The movable tool 3 is provided with a stop groove 331 which is connected to the pivot hole 33 at one end close to the pivot hole 33, and a second stop plane 333 which blocks and interferes with the first stop plane 223 is provided on the inner side of the stop groove 331. The stop groove 331 is used to accommodate the stop protrusion 221, and the stop groove 331 has a second arc segment 332 which is concentric with the pivot hole 33, and the radius of the second arc segment 332 is larger than the radius of the first arc segment 222, and the area of ​​the second stop plane 333 is larger than the area of ​​the first stop plane 223.

[0031] The pivot shaft 22 is designed to fit tightly with the pivot hole 33 on the movable cutter 3, ensuring effective rotation between them. A first stop surface 223 is provided on the pivot shaft 22, while a second stop surface 333 is provided in the pivot hole 33 of the movable cutter 3. The mutual interference between these two surfaces effectively limits the range of motion of the movable cutter 3, preventing it from exceeding its designed trajectory, thereby ensuring the stability and safety of the device.

[0032] This structure allows the movable tool 3 to rotate freely within a certain angle range, making the machining process more flexible. The design of the stop surface can effectively prevent the movable tool 3 from accidentally falling off or swinging excessively, thereby improving the safety of the operation.

[0033] Specifically, the first cutter 31 is provided with two first tenons 311, and the movable tool 3 is provided with two first notches 34 for accommodating the first tenons 311. The movable tool 3 is detachably connected to two first limiting plates 35, and the two first limiting plates 35 are respectively located at the two ends of the first notches 34. The first limiting plates 35 are used to block and resist the first tenons 311 in the first notches 34 to limit the first cutter 31 on the movable tool 3.

[0034] Specifically, the second cutter 21 is provided with two second tenons 211, and the fixed knife seat 2 is provided with two second notches 23 for accommodating the second tenons 211. Two second limiting pieces 24 are detachably connected to the fixed knife seat 2. The two second limiting pieces 24 are respectively located at the two ends of the second notches 23. The second limiting pieces 24 are used to block and resist the second tenons 211 in the second notches 23 to limit the second cutter 21 to the fixed knife seat 2.

[0035] In this embodiment, the two first limiting plates 35 are fixed to the movable cutter 3 by hexagon socket head screws, and the two second limiting plates 24 are also fixed to the fixed cutter seat 2 by hexagon socket head screws. The first cutter 31 and the movable cutter 3 are matched by the first tenon 311 and the first notch 34 to achieve an active connection. The first tenon 311 and the second tenon 211 are arranged in an arc shape, and correspondingly, the first notch 34 and the second notch 23 are also arranged in an arc shape. The design of the first tenon 311 enables it to slide within the first notch 34 while ensuring relative stability. The first limiting plate 35 is designed to be detachable, which is convenient for quick disassembly and assembly when replacing the cutter head. This design improves the flexibility and maintainability of the equipment. Each limiting plate fits tightly with both ends of the first notch 34, which can effectively prevent the first cutter 31 from accidentally falling off when in operation.

[0036] Specifically, the fixed tool holder 2 is provided with two stop blocks 25, one located on either side of the movable tool 3. Each stop block 25 is provided with a fastening bolt 26, and the end of the fastening bolt 26 closest to the movable tool 3 is provided with a flexible buffer portion. The fixed tool holder 2 is the main support portion of the equipment, while the two stop blocks 25 stabilize the position of the movable tool 3 to prevent it from excessive displacement during use. The flexible buffer portion of the fastening bolt 26 is made of silicone and is used to absorb the vibration and impact force generated by the movable tool 3 during the machining process. This effectively reduces tool wear, helps extend the tool's service life, and also improves the stability and precision of the machining process.

[0037] Specifically, the free end of the first cutter 31 is provided with a first blade for shearing the wire, and the free end of the second cutter 21 is provided with a second blade for use with the first blade. The cutting planes of the first blade and the second blade are not coplanar. This staggered arrangement of the two blades can help reduce friction and resistance during the shearing process by clamping and cutting the wire, thereby improving efficiency.

[0038] The non-coplanar blade design allows for more precise control of the shear angle and shear force distribution, especially when processing wires of different diameters, hardness or material properties. This helps to reduce deviations in the shearing process and improve product consistency and quality. Compared to the synchronous displacement of two blades to perform shearing, since only one blade part (usually the one that moves) is mainly subjected to wear, while the other blade part remains stationary, the wear rate can be significantly reduced, thereby extending the service life of the entire tool system. In addition, the static blade part can also serve as a support surface to help maintain stability during the shearing process.

[0039] Specifically, the tangent mechanism also includes a support base 6, which is arranged in an "L" shape. The fixed blade holder 2 is detachably connected to one end of the support base 6, and the other end of the support base 6 is reciprocally mounted on an external screw threading machine. The "L"-shaped support base 6 is compact in design, effectively saving space, making the entire tangent mechanism more compact and flexible, and easy to install and use in limited spaces.

[0040] The support base 6 is constructed in an "L" shape, which not only provides a stable support base, but also cleverly utilizes the spatial layout. One end of the support base 6 is connected to the fixed tool holder 2 in a detachable manner. This connection method is convenient for replacing or maintaining the tool, and improves the flexibility and maintainability of the equipment. At the other end, the support base 6 is connected to the external screw threading machine through a slide rail to achieve reciprocating movement. This connection is driven by a mechanical transmission system (such as a motor, a reducer, a connecting rod mechanism, etc.) to achieve precise control of the position and speed of the support base 6 and the fixed tool holder 2.

[0041] Specifically, a movable plate 7 is provided at the bottom of the fixed knife seat 2, and the movable plate 7 is set on the support seat 6 for reciprocating movement. The moving direction of the movable plate 7 is cross-set with the moving direction of the support seat 6. The movable plate 7 is provided with two arc-shaped holes for accommodating external bolt fasteners. The movable plate 7 is detachably connected to the bottom of the fixed knife seat 2 via external bolt fasteners.

[0042] The fixed knife holder 2 is connected to the support seat 6 through a movable plate 7. The movable plate 7 is designed to be able to move back and forth on the support seat 6, and its moving direction intersects with the moving direction of the support seat 6 itself. This design realizes the possibility of multi-dimensional adjustment. The movable plate 7 is provided with two arc holes, which are used to accommodate external bolt fasteners, such as screws or bolts. By passing the bolt fasteners through the arc holes and fixing them to the bottom of the fixed knife holder 2, a detachable connection between the movable plate 7 and the fixed knife holder 2 is realized. The design of the arc holes allows the position of the bolt to be adjusted within a certain range to adapt to different installation requirements or to adjust the position of the fixed knife holder 2. In the present embodiment, the support seat 6 is slidably connected to the screw sleeve machine through a fixed plate 8.

[0043] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A tangent mechanism for a screw thread machine, characterized in that: The invention comprises a driving motor (1), a fixed blade seat (2), and a movable blade (3); the fixed blade seat (2) is used to be connected to an external screw threading machine; the movable blade (3) is rotatably arranged on the fixed blade seat (2); the movable blade (3) is provided with a first cutter (31) for cutting wire rods; the fixed blade seat (2) is provided with a second cutter (21) used in conjunction with the first cutter (31); the wire cutting mechanism further comprises a cam (4) connected to the driving motor (1); the central axis of the cam (4) and the central axis of the output shaft of the driving motor (1) do not overlap with each other; an end of the movable blade (3) away from the first cutter (31) is provided with a strip-shaped notch (32) for being sleeved on the outside of the cam (4); the driving motor (1) drives the movable blade (3) to swing back and forth relative to the fixed blade seat (2) via the cam (4) so ​​that the first cutter (31) and the second cutter (21) clamp and cut the wire rods on the screw threading machine.

2. The thread cutting mechanism for a screw thread inserting machine according to claim 1, characterized in that: The tangent mechanism further comprises a reducer (5) connected to the drive motor (1); the cam (4) has a transmission shaft (41); the transmission shaft (41) is connected to the output shaft of the reducer (5); the central axis of the transmission shaft (41) and the central axis of the output shaft of the reducer (5) do not coincide with each other; the drive motor (1) drives the cam (4) to rotate eccentrically via the reducer (5).

3. The thread cutting mechanism for a screw thread inserting machine according to claim 1, characterized in that: A needle roller bearing (42) is provided on the outside of the cam (4), and the strip-shaped notch (32) is arranged in a racetrack shape, and the strip-shaped notch (32) is sleeved on the outside of the needle roller bearing (42).

4. The thread cutting mechanism for a screw thread inserting machine according to claim 1, characterized in that: The fixed knife seat (2) is provided with a pivot shaft (22), the movable knife (3) is provided with a pivot hole (33) that is rotatably matched with the pivot shaft (22), and the movable knife (3) is rotatably connected to the fixed knife seat (2) via the pivot shaft (22).

5. The thread cutting mechanism for a screw thread inserting machine according to claim 4, characterized in that: The pivot shaft (22) is provided with a stop protrusion (221) at one end close to the movable tool (3), and the stop protrusion (221) has a first stop plane (223) and a first arc segment (222) arranged concentrically with the pivot shaft (22). The movable tool (3) is provided with a stop groove (331) connected to the pivot hole (33), and the stop groove (331) is used to accommodate the stop protrusion (221). The stop groove (331) has a second arc segment (332) arranged concentrically with the pivot hole (33) and a second stop plane (333) used to stop and contact the first stop plane (223). The radius of the second arc segment (332) is greater than the radius of the first arc segment (222), and the area of ​​the second stop plane (333) is greater than the area of ​​the first stop plane (223).

6. The thread cutting mechanism for a screw thread inserting machine according to claim 1, characterized in that: The first cutter (31) is provided with a first tenon (311), the movable cutter (3) is provided with a first notch (34) for accommodating the first tenon (311), and the movable cutter (3) is detachably connected to two first limiting pieces (35), the two first limiting pieces (35) being respectively located at two ends of the first notch (34), and the first limiting pieces (35) being used to block and abut the first tenon (311) in the first notch (34) so ​​as to limit the first cutter (31) on the movable cutter (3).

7. The thread cutting mechanism for a screw thread inserting machine according to claim 1, characterized in that: The second cutter (21) is provided with a second tenon (211), the fixed knife seat (2) is provided with a second notch (23) for accommodating the second tenon (211), and the fixed knife seat (2) is detachably connected with two second limiting pieces (24), the two second limiting pieces (24) are respectively located at the two ends of the second notch (23), and the second limiting pieces (24) are used to block and resist the second tenon (211) in the second notch (23) to limit the second cutter (21) on the fixed knife seat (2).

8. The thread cutting mechanism for a screw thread inserting machine according to claim 1, characterized in that: The fixed knife seat (2) is provided with two stop blocks (25), which are respectively located on both sides of the movable knife (3). The two stop blocks (25) are both provided with a fastening bolt (26), and a flexible buffer portion is provided at one end of the fastening bolt (26) close to the movable knife (3).

9. The thread cutting mechanism for a screw thread inserting machine according to claim 1, characterized in that: The free end of the first cutter (31) is provided with a first blade portion for cutting wire rods, and the free end of the second cutter (21) is provided with a second blade portion for use with the first blade portion, and the cutting plane of the first blade portion and the cutting plane of the second blade portion are not in the same plane.

10. The thread cutting mechanism for a screw thread inserting machine according to claim 1, characterized in that: The tangent mechanism further comprises a support seat (6), which is arranged in an "L" shape. The fixed knife seat (2) is detachably connected to one end of the support seat (6), and the other end of the support seat (6) is reciprocatingly arranged on an external screw threading machine.

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