A nut production internal thread processing equipment

Abstract

The application relates to the technical field of nut machining devices, in particular to a nut production internal thread machining device. The nut production internal thread machining device comprises a tapping mechanism, a limiting mechanism, a first transmission mechanism and a second transmission mechanism. The tapping mechanism comprises a tapping column, the tapping mechanism is first in a first working stage, the first transmission mechanism makes the diameter of the tapping column reach a first target value, then the tapping mechanism is in a second working stage, and the second transmission mechanism makes the diameter of the tapping column increase to a second target value. The limiting mechanism realizes automatic compensation of the wear of the tap block by limiting the maximum diameter of the tapping column, ensures that the tapping column can expand to the second target diameter, and thus qualified products can be produced, so that the service life is prolonged and the working efficiency is improved. The nut production internal thread machining device provided by the application can solve the problem that, after the tapping head of an existing nut tapping machine is worn, unqualified products are continuously produced, and the production efficiency is low.

Description

Technical Field

[0001] This invention relates to the field of nut processing equipment technology, and more specifically to an internal thread processing device for nut production. Background Technology

[0002] A nut tapping machine is a machining device that processes internal threads, screws, or threads, on the inner surface of holes in various parts such as nuts and flanges, which have through holes or blind holes of various specifications. Its function is similar to tapping internal threads with a tap. Nut tapping machines are also called nut threading machines, automatic nut tapping machines, fully automatic nut tapping machines, tapping machines, or threading machines.

[0003] Based on the type of driving power, nut tapping machines can be divided into pneumatic tapping machines, electric tapping machines, and hydraulic tapping machines. Based on the number of spindles, they can be divided into single-axis, two-axis, four-axis, and six-axis nut tapping machines. Based on the type of nut being processed, nut tapping machines can be further divided into hot-forged nut tapping machines, flange nut tapping machines, round nut tapping machines, hexagonal nut tapping machines, blind hole nut tapping machines, and anti-theft nut tapping machines, among others. Based on the degree of automation in the processing, nut tapping machines can be divided into fully automatic, semi-automatic, and general-purpose nut tapping machines.

[0004] For example, the invention patent application CN119368833A discloses a nut tapping machine. By incorporating a vibration device to vibrate the nut blank before fixing it, it prevents the bottom surface of the nut blank from being unevenly positioned on the rotating plate when pushed by the pushing device, thus improving the stability of the tapping process. However, a more fundamental problem is that the tapping head, as the core component directly performing the cutting function, inevitably experiences wear after prolonged operation. Once the tapping head wears down, its machining accuracy becomes difficult to guarantee, resulting in the continuous production of products with substandard dimensions or threads. This not only lowers the production yield but also causes a continuous negative impact on production efficiency due to the interruption of the production process for tool replacement and adjustment, thereby limiting further improvements in the overall efficiency of the equipment. Summary of the Invention

[0005] This invention provides an internal thread processing device for nut production, which solves the problem that existing nut tapping machines continuously produce substandard products after the tapping head wears down, resulting in low production efficiency.

[0006] The present invention provides an internal thread processing device for nut production, comprising a machine body, a tapping mechanism, a limiting mechanism, a first transmission mechanism, and a second transmission mechanism. The tapping mechanism includes a tapping pin, which comprises a triangular pyramid and multiple tap blocks. The centerline of the triangular pyramid is arranged along a first direction, and the triangular pyramid is rotatably mounted on the machine body and can slide along the first direction, which is horizontal. Each tap block is slidably disposed on one side of the triangular pyramid in the circumferential direction, and the tap block abuts against the inner wall of the nut. The tap block taps the nut when it rotates around the centerline of the triangular pyramid. The first transmission mechanism pushes the triangular pyramid and tap blocks closer together, thereby reducing the diameter of the tapping pin. The second transmission mechanism pushes the triangular pyramid and tap blocks further apart, thereby increasing the diameter of the tapping pin.

[0007] Initially, the diameter of the tapping pin is a set value. The tapping mechanism has two sequential working stages. In the first stage, a first transmission mechanism adjusts the tapping pin diameter to a first target value, which is less than the inner diameter of the nut to be machined. In the second stage, with the tapping pin inside the nut, the second transmission mechanism increases the tapping pin diameter to a second target value, which is greater than the inner diameter of the nut to be machined but less than the set value. A limiting mechanism prevents the tapping pin diameter from exceeding the second target value.

[0008] Furthermore, a first slide rail is provided on the machine body. The first slide rail is arranged along a first direction, and its two ends along the first direction are a first end and a second end, respectively. The first transmission mechanism, the nut, and the tapping mechanism are all disposed within the first slide rail and are distributed sequentially from the first end to the second end of the first slide rail. The first slide rail is used to restrict the rotation of the nut and restrict the movement of the tap block.

[0009] Along the direction from the first end to the second end of the first slide, the cross-sectional area of ​​the truncated pyramid perpendicular to the first direction gradually increases, while the cross-sectional area of ​​the tap block perpendicular to the first direction gradually decreases. When the end of the truncated pyramid near the second end of the first slide and the end of the tap block near the second end of the first slide are close to each other, the diameter of the tapping post decreases. When the end of the truncated pyramid near the second end of the first slide and the end of the tap block near the second end of the first slide are far apart, the diameter of the tapping post increases.

[0010] Furthermore, the first transmission mechanism includes a push tube, a top connecting rod, and a transmission assembly. The push tube is arranged along a first direction and is slidably disposed within a first slide rail along the first direction. One end of the top connecting rod is slidably disposed within the push tube, and the other end of the top connecting rod is used to abut against the truncated triangular pyramid.

[0011] The transmission assembly includes a first spring, a slip ring, and a spring. The first spring is fixedly mounted inside the push tube. The slip ring and the top connecting rod are coaxially arranged, with the slip ring slidably sleeved on the top connecting rod and slidably positioned inside the push tube. The spring connects the slip ring and the top connecting rod.

[0012] When the tapping mechanism is in its first working stage, the slip ring is positioned on the side of the first spring piece closest to the second end of the first slide, and abuts against the first spring piece; the push tube and the top connecting rod move synchronously. When the tapping mechanism is in its second working stage, the slip ring is positioned on the side of the first spring piece closest to the first end of the first slide, and the push tube moves relative to the top connecting rod.

[0013] Furthermore, a limiting groove is formed on the top connecting rod, the limiting groove is set along the first direction, and along the direction from the first end to the second end of the first slide, the two ends of the limiting groove are the third end and the fourth end, respectively. A limiting rod is fixedly set on the machine body, the limiting rod is set vertically, and the limiting rod is located in the limiting groove.

[0014] Furthermore, the first transmission mechanism also includes a hydraulic rod, which is fixedly mounted on the machine body and arranged along a first direction. One end of the hydraulic rod is fixedly connected to the push tube.

[0015] Furthermore, the second transmission mechanism includes a second spring plate, which connects the triangular pyramid frustum and the tap block.

[0016] Furthermore, the limiting mechanism includes a limiting ring, which is rotatably disposed at one end of the push tube near the second end of the first slide. The limiting ring is used to abut against the nut. The inner diameter of the limiting ring is a second target value. The inner ring of the limiting ring is used to abut against the tapping post to limit the diameter of the tapping post from exceeding the second target value.

[0017] Furthermore, a T-shaped block is fixedly installed on each side of the truncated pyramid in the circumferential direction. Along the direction from the first end to the second end of the first slide, the width of the T-shaped block gradually increases along the circumferential direction of the truncated pyramid. The outer wall of the tap block is concave and arc-shaped, facing the truncated pyramid. Each tap block includes an elastic block and two alloy blades. The alloy blades are fixedly installed on the elastic block, and the two alloy blades are respectively located on both sides of the elastic block along the circumferential direction of the truncated pyramid.

[0018] Each elastic block has a T-slot, and each T-block is slidably disposed within a T-slot. A first arc surface is formed on the side of the T-slot away from the truncated pyramid, with the concave surface of the first arc surface facing the truncated pyramid. Along the direction from the first end to the second end of the first slide, the arc length and diameter of the first arc surface gradually increase, so that when the truncated pyramid and the tap block approach each other, the diameter of the elastic block on the side away from the truncated pyramid increases under the action of the T-block, thus accommodating the increased diameter of the tapping post.

[0019] Furthermore, an internal thread processing device for nut production also includes a rotating mechanism, which comprises a motor and a discharge block. The motor is fixedly mounted on the machine body. The discharge block is rotatably mounted on the machine body and is located at the second end of the first slide rail. The output shaft of the motor and the discharge block are fixedly connected.

[0020] The discharge block has a curved groove, within which a bent-shank tap is installed. A threaded rod is fixedly installed at one end of the triangular pyramid near the second end of the first slide. The threaded rod and the bent-shank tap are connected by a threaded drive. The machined nut is located within the curved groove and slidably mounted on the bent-shank tap.

[0021] Furthermore, a feeding box is fixedly installed on the machine body, and a feeding channel communicating with the first slide is opened on the feeding box. The feeding channel is located between the tapping mechanism and the first transmission mechanism.

[0022] The beneficial effects of this invention are as follows: The internal thread processing equipment for nut production of this invention, through the set tapping mechanism, first operates in a first working stage, where a first transmission mechanism causes the diameter of the tap post to reach a first target value. Then, the tapping mechanism operates in a second working stage, where the nut to be processed is fitted onto the tap post, and the second transmission mechanism causes the diameter of the tap post to first increase until it abuts against the inner wall of the nut to be processed. The tap post rotates to tap the nut, and during the tapping process, the diameter of the tap post gradually increases to a second target value.

[0023] The limiting mechanism automatically compensates for tap wear by restricting the maximum diameter of the tap pin. When the tap wears down, the truncated pyramid and the tap block need to move further apart to contact the limiting ring. This compensates for the wear, ensuring that the tap pin can expand to the second target diameter, thus producing qualified products, extending its service life, and reducing the need for frequent tap pin replacements, thereby improving production efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of an internal thread processing device for nut production provided in an embodiment of the present invention;

[0026] Figure 2 This is a partial structural schematic diagram of an internal thread processing device for nut production provided in an embodiment of the present invention;

[0027] Figure 3This is a partial structural cross-sectional view of an internal thread processing device for nut production provided in an embodiment of the present invention;

[0028] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0029] Figure 5 for Figure 3 Enlarged view of point B in the middle;

[0030] Figure 6 for Figure 3 Enlarged view of point C in the middle;

[0031] Figure 7 This is a schematic diagram of the tapping mechanism of an internal thread processing equipment for nut production in the second working stage, provided by an embodiment of the present invention.

[0032] Figure 8 for Figure 7 Enlarged view at point D;

[0033] Figure 9 for Figure 7 Enlarged view at point E in the middle;

[0034] Figure 10 An exploded view of the tapping mechanism of an internal thread processing equipment for nut production provided in an embodiment of the present invention;

[0035] Figure 11 for Figure 10 Enlarged view at point F;

[0036] Figure 12 This is a schematic diagram of the structure of a triangular pyramid and a tap block for an internal thread processing device for nut production, provided in an embodiment of the present invention.

[0037] In the diagram: 101, machine body; 102, feeding box; 1021, feeding channel; 103, hydraulic rod; 104, motor; 105, collecting box; 201, push tube; 2011, first clearance groove; 2012, first spring; 2013, limiting ring; 202, first slide rail; 2021, limiting rod; 203, discharge block; 2031, curved groove; 204, top connecting rod; 2041, slip ring; 2042, spring; 2043, limiting groove; 300, bent shank tap; 302, triangular pyramid frustum; 3021, T-block; 303, tap block; 3032, T-slot; 304, second spring; 305, threaded rod. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Reference Figures 1 to 12 As shown in the embodiment of the present invention, an internal thread processing device for nut production includes a machine body 101, a tapping mechanism, a limiting mechanism, a first transmission mechanism, and a second transmission mechanism. The tapping mechanism includes a tapping post, which comprises a triangular pyramid 302 and multiple tap blocks 303. The centerline of the triangular pyramid 302 is arranged along a first direction, and the triangular pyramid 302 is rotatably mounted on the machine body 101 and can slide along the first direction, which is horizontal. Each tap block 303 is slidably disposed on one side of the triangular pyramid 302 in the circumferential direction. The tap block 303 abuts against the inner wall of the nut, and taps the nut by rotating around the centerline of the triangular pyramid 302. The first transmission mechanism is used to push the triangular pyramid 302 and the tap blocks 303 closer together, thereby reducing the diameter of the tapping post. The second transmission mechanism is used to push the triangular pyramid 302 and the tap blocks 303 further apart, thereby increasing the diameter of the tapping post.

[0040] Initially, the diameter of the tapping pin is a set value. The tapping mechanism has two sequential working stages. In the first stage, a first transmission mechanism adjusts the tapping pin diameter to a first target value, which is less than the inner diameter of the nut to be machined. In the second stage, with the tapping pin inside the nut, the second transmission mechanism increases the tapping pin diameter to a second target value, which is greater than the inner diameter of the nut to be machined but less than the set value. A limiting mechanism prevents the tapping pin diameter from exceeding the second target value.

[0041] The tapping mechanism first operates in the first stage, where the first transmission mechanism brings the diameter of the tap pin to a first target value. Then, in the second stage, the nut to be machined is fitted onto the tap pin, and the second transmission mechanism increases the diameter of the tap pin until it abuts against the inner wall of the nut. The tap pin rotates to tap the nut, and during the tapping process, the diameter of the tap pin gradually increases to a second target value.

[0042] The limiting mechanism automatically compensates for the wear of the tap block 303 by limiting the maximum diameter of the tap post. When the tap block 303 wears down, the triangular pyramid 302 and the tap block 303 need to move further apart to contact the limiting ring 2013. This compensates for the wear and ensures that the tap post can expand to the second target diameter, thereby extending its service life.

[0043] In this embodiment, a first slide rail 202 is provided on the body 101. The first slide rail 202 is arranged along a first direction, and its two ends along the first direction are a first end and a second end, respectively. The first transmission mechanism, the nut, and the tapping mechanism are all disposed within the first slide rail 202 and are distributed sequentially from the first end to the second end of the first slide rail 202. The first slide rail 202 is used to restrict the rotation of the nut and restrict the movement of the tap block 303.

[0044] Along the direction from the first end to the second end of the first slide rail 202, the cross-sectional area of ​​the triangular pyramid 302 perpendicular to the first direction gradually increases, while the cross-sectional area of ​​the tap block 303 perpendicular to the first direction gradually decreases. When the end of the triangular pyramid 302 near the second end of the first slide rail 202 and the end of the tap block 303 near the second end of the first slide rail 202 approach each other, the diameter of the tapping post decreases. When the end of the triangular pyramid 302 near the second end of the first slide rail 202 and the end of the tap block 303 near the second end of the first slide rail 202 move away from each other, the diameter of the tapping post increases.

[0045] In this embodiment, the first transmission mechanism includes a push tube 201, a top connecting rod 204, and a transmission assembly. The push tube 201 is disposed along a first direction and is slidably disposed within a first slide rail 202 along the first direction. One end of the top connecting rod 204 is slidably disposed within the push tube 201, and the other end of the top connecting rod 204 is used to abut against the triangular pyramid 302.

[0046] The transmission assembly includes a first spring plate 2012, a slip ring 2041, and a spring 2042. The first spring plate 2012 is fixedly disposed inside the push tube 201. The slip ring 2041 and the top connecting rod 204 are coaxially disposed, with the slip ring 2041 slidably sleeved on the top connecting rod 204 and slidably disposed inside the push tube 201. The spring 2042 connects the slip ring 2041 and the top connecting rod 204.

[0047] When the tapping mechanism is in its first working stage, the slip ring 2041 is positioned on the side of the first spring piece 2012 near the second end of the first slide rail 202 and abuts against the first spring piece 2012, while the push tube 201 and the top connecting rod 204 move synchronously. When the tapping mechanism is in its second working stage, the slip ring 2041 is positioned on the side of the first spring piece 2012 near the first end of the first slide rail 202, while the push tube 201 moves relative to the top connecting rod 204.

[0048] In this embodiment, a limiting groove 2043 is formed on the top connecting rod 204. The limiting groove 2043 is arranged along a first direction and along the direction from the first end to the second end of the first slide rail 202. The two ends of the limiting groove 2043 are the third end and the fourth end, respectively. A limiting rod 2021 is fixedly arranged on the machine body 101. The limiting rod 2021 is arranged vertically and is located in the limiting groove 2043. A first clearance groove 2011 is formed on the push tube 201 along the first direction. The limiting rod 2021 is slidably arranged in the first clearance groove 2011.

[0049] When the tapping mechanism is in the first working stage, the limiting rod 2021 is at the fourth end of the limiting groove 2043, and the limiting rod 2021 and the top connecting rod 204 can slide relative to each other. When the tapping mechanism is in the second working stage, the limiting rod 2021 is at the third end of the limiting groove 2043 to restrict the movement of the top connecting rod 204 along the path from the first end to the second end of the first slide rail 202.

[0050] In this embodiment, the first transmission mechanism further includes a hydraulic rod 103, which is fixedly mounted on the machine body 101. The hydraulic rod 103 is arranged along a first direction, and the hydraulic rod 103 is fixedly connected to one end of the push tube 201 near the first end of the first slide rail 202. When the hydraulic rod 103 extends, it pushes the push tube 201 to move along the direction from the first end to the second end of the first slide rail 202.

[0051] In this embodiment, the second transmission mechanism includes a second spring plate 304, which is connected to the triangular pyramid 302 and the tap block 303.

[0052] In other embodiments, each tap block 303 has an arc groove at one end near the first end of the first slide 202, with the concave surface of the arc groove facing the triangular pyramid 302. One side of the second spring piece 304 is fixedly mounted on the triangular pyramid 302, and the other side of the second spring piece 304 is slidably disposed within the multiple arc grooves. In the initial state, the second spring piece 304 and the sidewall of the arc groove near the triangular pyramid 302 abut against each other, causing the diameter of the tapping post to be at a set value.

[0053] In this embodiment, the limiting mechanism includes a limiting ring 2013, which is rotatably disposed at one end of the push tube 201 near the second end of the first slide rail 202. The limiting ring 2013 is used to abut against the nut. The inner diameter of the limiting ring 2013 is a second target value. The inner ring of the limiting ring 2013 is used to abut against the tapping post to limit the diameter of the tapping post from exceeding the second target value.

[0054] In this embodiment, a T-shaped block 3021 is fixedly provided on each side of the triangular pyramid 302 in the circumferential direction. Along the direction from the first end to the second end of the first slide rail 202, the width of the T-shaped block 3021 gradually increases in the circumferential direction of the triangular pyramid 302.

[0055] The outer wall of the tap block 303 is concave and arc-shaped towards the triangular pyramid 302. Along the direction gradually moving away from the triangular pyramid 302, the width of the tap block 303 gradually increases circumferentially around the triangular pyramid 302. Each tap block 303 includes an elastic block and two alloy blades. The elastic block is elastic, and the alloy blades are fixedly mounted on the elastic block, with the two alloy blades located on opposite sides of the elastic block along the circumference of the triangular pyramid 302.

[0056] Each elastic block has a T-slot 3032, and each T-block 3021 is slidably disposed within a T-slot 3032. A first arc surface is formed on the side of the T-slot 3032 away from the truncated pyramid 302, with the concave surface of the first arc surface facing the truncated pyramid 302. Along the direction from the first end to the second end of the first slide rail 202, both the arc length and diameter of the first arc surface gradually increase, so that when the truncated pyramid 302 and the tap block 303 approach each other, the diameter of the side of the elastic block away from the truncated pyramid 302 increases under the action of the T-block 3021, to accommodate the increased diameter tapping post. Both the elastic block and the two alloy inserts have clearance grooves on the side away from the truncated pyramid 302 for clearance.

[0057] In this embodiment, an internal thread processing device for nut production further includes a rotating mechanism, which includes a motor 104 and a discharge block 203. The motor 104 is fixedly mounted on the machine body 101. The discharge block 203 is rotatably mounted on the machine body 101 and is located at the second end of the first slide rail 202. The output shaft of the motor 104 and the discharge block 203 are fixedly connected.

[0058] A curved groove 2031 is formed inside the discharge block 203, and a bent-shank tap 300 is installed inside the curved groove 2031. A threaded rod 305 is fixedly installed at one end of the triangular pyramid 302 near the second end of the first slide rail 202. The threaded rod 305 and the bent-shank tap 300 are connected by a threaded drive. The machined nut is located in the curved groove 2031 and is slidably mounted on the bent-shank tap 300.

[0059] Start the motor 104, which drives the discharge block 203 to rotate. The discharge block 203 drives the bent shank tap 300 to rotate. The bent shank tap 300 drives the triangular pyramid 302 to rotate through the threaded rod 305. The triangular pyramid 302 drives multiple tap blocks 303 to rotate synchronously.

[0060] In this embodiment, a feeding box 102 is fixedly installed on the machine body 101. The feeding box 102 has a feeding channel 1021 that communicates with the first slide rail 202. The feeding channel 1021 is located between the tapping mechanism and the first transmission mechanism. A collection box 105 is fixedly installed on the machine body 101. The discharge block 203 is rotatably disposed in the collection box 105. The collection box 105 is used to collect the processed nuts that fall from the curved groove 2031.

[0061] Working process: In the initial state, the second spring 304 keeps the tapping post at the set diameter. At this time, the slip ring 2041 abuts against the side of the first spring 2012 near the second end of the first slide 202, and the limiting rod 2021 is located at the fourth end of the limiting groove 2043, allowing the top connecting rod 204 and the limiting rod 2021 to slide relative to each other.

[0062] During operation, multiple nuts are placed into the feeding box 102, and the nuts enter the first slide rail 202 through the feeding channel 1021. The motor 104 is started, and the motor 104 drives the discharge block 203 to rotate. The discharge block 203 drives the bent shank tap 300 to rotate. The bent shank tap 300 drives the triangular pyramid 302 to rotate through the threaded rod 305. The triangular pyramid 302 drives multiple tap blocks 303 to rotate synchronously.

[0063] The hydraulic rod 103 is activated, and it extends to push the push tube 201 along the direction from the first end to the second end of the first slide rail 202. The push tube 201 pushes the slip ring 2041 to move synchronously through the first spring plate 2012, which compresses the spring 2042, and then the spring 2042 pushes the top connecting rod 204 to move in the same direction.

[0064] The top connecting rod 204 passes through the nut and abuts against the triangular pyramid 302 (at this time, the limiting ring 2013 has not yet contacted the nut). Because the tap block 303 is constrained by the first slide rail 202 and can only rotate, the thrust of the top connecting rod 204 causes the triangular pyramid 302 to slide relative to the tap block 303 towards the second end of the first slide rail 202. The end of the triangular pyramid 302 near the second end of the first slide rail 202 and the end of the tap block 303 near the second end of the first slide rail 202 approach each other, and the diameter of the tapping post gradually decreases to the first target value. This process causes the second spring 304 to deform. At this point, the tapping mechanism enters the first working stage.

[0065] As the diameter of the tapping pin gradually decreases to the first target value, the push tube 201 pushes the limit ring 2013 against the nut and pushes the nut to move, so that the nut is fitted onto the tapping pin with the reduced diameter.

[0066] When the tapping pin diameter reaches the first target value, the limiting rod 2021 slides to the third end of the limiting groove 2043, restricting the further movement of the top connecting rod 204. The push tube 201 continues to advance, forcing the slip ring 2041 past the first spring plate 2012. Subsequently, the spring 2042 releases, driving the top connecting rod 204 to reset, disengaging it from the triangular pyramid 302. Under the restoring force of the second spring plate 304, the triangular pyramid 302 resets and moves towards the first end of the first slide 202, moving away from the tap block 303, and the diameter of the tapping pin begins to gradually increase.

[0067] The diameter of the tapping pin first increases to the same as the inner diameter of the nut, meaning the inner diameters of the tapping pin and the nut are aligned, and the tapping pin taps the nut as it rotates. Under the continuous action of the second spring 304, the diameter of the tapping pin continues to expand during the cutting process. Meanwhile, the push tube 201 moves relative to the fixed top rod 204, pushing the limit ring 2013 forward until the tapping pin is incorporated into its inner ring, after which the hydraulic rod 103 is closed. This stage is the second working stage of the tapping mechanism.

[0068] When the diameter of the tapping post expands to contact the inner wall of the limiting ring 2013, it reaches the second target value and stops increasing due to its limitation. At this time, the tapping post forms a threaded engagement with the machined nut. The continuous rotation of the tapping post pushes the nut from it to the bent shank tap 300, and the nut finally slides down along the curved groove 2031 into the collection box 105.

[0069] The limiting ring 2013 automatically compensates for the wear of the tap block 303 by limiting the maximum diameter of the tap post. When the tap block 303 wears down, the triangular pyramid 302 and the tap block 303 need to move further apart to contact the limiting ring 2013. This compensates for the wear and ensures that the tap post can expand to the second target diameter, thereby extending its service life.

[0070] As the triangular pyramid 302 and the tap block 303 move away from each other, the T-block 3021 and the T-slot 3032 cooperate to increase the diameter of the side of the elastic block away from the triangular pyramid 302, thereby increasing the outer diameter of the entire tap block 303 synchronously to match the overall diameter expansion of the tapping column.

[0071] During the tapping process, the cutting resistance between the nut and the tap pin gradually increases. This resistance is more significant if the diameter of the nut hole to be machined is small. In the second working stage, excessive cutting resistance hinders the rotation of the tap pin relative to the bent shank tap 300, causing relative rotation between the two. Through the transmission of the threaded rod 305, this relative rotation is converted into a tendency for the triangular pyramid 302 to move towards the second end of the first slide 202. This tendency counteracts the force of the second spring 304 pushing the triangular pyramid 302 back towards the first end of the first slide 202, thereby suppressing the expansion of the tap pin diameter, which is equivalent to reducing the tapping feed. The reduction in feed reduces the cutting resistance, providing overload protection and further extending the service life of the tap pin.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An internal thread processing device for nut production, characterized in that: The device includes a body, a tapping mechanism, a limiting mechanism, a first transmission mechanism, and a second transmission mechanism. The tapping mechanism includes a tapping pin, which comprises a triangular pyramid and multiple tap blocks. The centerline of the triangular pyramid is set along a first direction, and the triangular pyramid is rotatably mounted on the body and can slide along the first direction, which is horizontal. Each tap block is slidably mounted on one side of the triangular pyramid in the circumferential direction. The tap block is used to abut against the inner wall of the nut, and taps the nut when the tap block rotates around the centerline of the triangular pyramid. The first transmission mechanism is used to push the triangular pyramid and the tap blocks closer together, so as to reduce the diameter of the tapping pin. The second transmission mechanism is used to push the triangular pyramid and the tap blocks further apart, so as to increase the diameter of the tapping pin. In the initial state, the diameter of the tapping pin is a set value. The tapping mechanism has a first working stage and a second working stage that are performed sequentially. The first working stage is as follows: the first transmission mechanism causes the diameter of the tapping pin to be at a first target value, which is less than the inner diameter of the nut to be processed. The second working stage is as follows: the tapping pin is inside the nut, and the second transmission mechanism causes the diameter of the tapping pin to increase to a second target value, which is greater than the inner diameter of the nut to be processed but less than the set value. A limiting mechanism prevents the diameter of the tapping pin from exceeding the second target value. The body has a first slide rail, which is arranged along a first direction, and the two ends of the first slide rail along the first direction are a first end and a second end, respectively. The first transmission mechanism includes a push tube, a top connecting rod, and a transmission assembly; the push tube is arranged along a first direction and is slidably arranged in a first slide rail along the first direction; one end of the top connecting rod is slidably arranged in the push tube, and the other end of the top connecting rod is used to abut against the triangular pyramid frustum; The transmission assembly includes a first spring, a slip ring, and a spring; the first spring is fixedly installed inside the push tube, the slip ring and the top connecting rod are coaxially arranged, the slip ring is slidably sleeved on the top connecting rod, and the slip ring is slidably installed inside the push tube; the spring connects the slip ring and the top connecting rod. When the tapping mechanism is in the first working stage, the slip ring is on the side of the first spring piece near the second end of the first slide and abuts against the first spring piece, and the push tube and the top connecting rod move synchronously; when the tapping mechanism is in the second working stage, the slip ring is on the side of the first spring piece near the first end of the first slide, and the push tube moves relative to the top connecting rod. The limiting mechanism includes a limiting ring, which is rotatably disposed at one end of the push tube near the second end of the first slide. The limiting ring is used to abut against the nut. The inner diameter of the limiting ring is a second target value. The inner ring of the limiting ring is used to abut against the tapping post to limit the diameter of the tapping post from exceeding the second target value.

2. The internal thread processing equipment for nut production according to claim 1, characterized in that: The first transmission mechanism, the nut, and the tapping mechanism are all located within the first slide rail and are distributed sequentially from the first end to the second end of the first slide rail. The first slide rail is used to restrict the rotation of the nut and the movement of the tap block. Along the direction from the first end to the second end of the first slide, the cross-sectional area of ​​the triangular pyramid perpendicular to the first direction gradually increases, while the cross-sectional area of ​​the tap block perpendicular to the first direction gradually decreases. When the end of the triangular pyramid near the second end of the first slide and the end of the tap block near the second end of the first slide are close to each other, the diameter of the tapping post decreases. When the end of the triangular pyramid near the second end of the first slide and the end of the tap block near the second end of the first slide are far apart, the diameter of the tapping post increases.

3. The internal thread processing equipment for nut production according to claim 1, characterized in that: A limiting groove is provided on the top connecting rod. The limiting groove is set along the first direction and along the direction from the first end to the second end of the first slide. The two ends of the limiting groove are the third end and the fourth end, respectively. A limiting rod is fixedly set on the machine body. The limiting rod is set vertically and is located in the limiting groove.

4. The internal thread processing equipment for nut production according to claim 1, characterized in that: The first transmission mechanism also includes a hydraulic rod, which is fixedly mounted on the machine body and arranged along a first direction. One end of the hydraulic rod is fixedly connected to the push tube.

5. The internal thread processing equipment for nut production according to claim 1, characterized in that: The second transmission mechanism includes a second spring plate, which is connected to a triangular pyramid and a tap block.

6. The internal thread processing equipment for nut production according to claim 1, characterized in that: A T-shaped block is fixedly installed on each side of the circumferential direction of the triangular pyramid. Along the direction from the first end to the second end of the first slide, the width of the T-shaped block gradually increases along the circumferential direction of the triangular pyramid. The outer wall of the tap block is an arc with a concave surface facing the triangular pyramid. Each tap block includes an elastic block and two alloy blades. The alloy blades are fixedly installed on the elastic block, and the two alloy blades are respectively located on both sides of the elastic block along the circumferential direction of the triangular pyramid. Each elastic block has a T-slot, and each T-block is slidably disposed in a T-slot. A first arc surface is formed on the side of the T-slot away from the triangular pyramid, and the concave surface of the first arc surface faces the triangular pyramid. Along the direction from the first end to the second end of the first slide, the arc length and diameter of the first arc surface gradually increase, so that when the triangular pyramid and the tap block approach each other, under the action of the T-block, the diameter of the side of the elastic block away from the triangular pyramid increases, so as to accommodate the tapping post with an increased diameter.

7. The internal thread processing equipment for nut production according to claim 1, characterized in that: It also includes a rotating mechanism, which includes a motor and a discharge block. The motor is fixedly mounted on the machine body; the discharge block is rotatably mounted on the machine body and is located at the second end of the first slide; the output shaft of the motor and the discharge block are fixedly connected. The discharge block has a curved groove, and a bent tap is installed in the curved groove; a threaded rod is fixedly installed at one end of the triangular pyramid near the second end of the first slide; the threaded rod and the bent tap are connected by a threaded drive; the machined nut is located in the curved groove and is slidably installed on the bent tap.

8. The internal thread processing equipment for nut production according to claim 1, characterized in that: A feeding box is fixedly installed on the machine body. The feeding box has a feeding channel that communicates with the first slide rail. The feeding channel is located between the tapping mechanism and the first transmission mechanism.

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