Metal bellows end fitting inner hole broaching equipment

Abstract

This invention discloses a broaching machine for the inner hole of a metal bellows end connector, relating to the field of inner hole broaching technology. It includes a broaching machine body and a broaching mechanism, the broaching mechanism being located on the top of the broaching machine body. The broaching mechanism includes a broach main rod, a broach groove, a sliding tool block, an arc ring, and a buffer surface. The broach groove is located inside the broach main rod, the sliding tool block slides inside the broach groove, and the arc ring rotates inside the broach main rod. Combined with a core rod linkage adjustment structure, the working outer diameter of the broach can be precisely controlled, adapting to rework conditions with different inner diameter deviations. It offers high processing adaptability and precision, avoiding the many drawbacks of traditional rework methods that involve cutting and secondary welding, such as complex processes, easy workpiece deformation, unstable secondary welding quality, and poor dimensional correction accuracy. This improves the efficiency of bellows coupling inner diameter rework, the finished product qualification rate, and the aesthetic appearance of the product.

Description

Technical Field

[0001] This invention relates to the field of internal hole broaching technology, specifically to a broaching machine for the internal hole of a metal bellows end connector. Background Technology

[0002] The metal bellows end joint is a rigid hub component that is welded and fixed to the end of the metal bellows. It has a pre-made through bottom hole and an internal spline hole is formed by broaching. It relies on the internal spline to mesh with the drive shaft to transmit alternating torque. At the same time, it cooperates with the bellows to realize shaft misalignment compensation. This component is a thin-walled welded assembly. After welding, it is prone to end face warping deformation. The bellows body connected to the rear end has high flexibility and low rigidity.

[0003] Metal bellows end joints, also known as metal bellows couplings, are typically broached and then welded to the metal bellows in actual production. Metal bellows couplings use a thin-walled, corrugated metal bellows as the elastic transmission base, with zero-backlash transmission components fixed to both ends. During operation, they transmit alternating torque through the torsional deformation of the bellows and compensate for axial, radial, and angular installation deviations between the two shafts using the elastic deformation of the bellows. They feature low transmission backlash and resistance to alternating loads, and are often used in high-precision servo drive applications. The broaching process allows for the machining of precision-compliant internal splines in the pre-drilled through holes of the end joint, enabling meshing transmission with the drive shaft.

[0004] However, existing broaching equipment for the inner hole of metal bellows end fittings has the following shortcomings: However, during the later quality inspection of some finished metal bellows, the spline dimensions on the inner side do not meet the standards, thus requiring secondary rework. However, the inner diameter of the metal bellows and the pipe end joint are the same. Therefore, the broach will directly affect the inner wall of the metal bellows during broaching. Furthermore, cutting and welding the finished coupling will directly affect the product's appearance and quality. In summary, the pipe end joint cannot be reworked by traditional broaching after welding. As a result, there is a lack of broaching equipment for metal bellows end joints under this situation.

[0005] Therefore, we propose a broaching machine for the inner hole of a metal bellows end connector to solve the problems mentioned above. Summary of the Invention

[0006] This invention discloses a broaching device for precise rework of the inner diameter of metal bellows couplings. It solves the problems of traditional bellows couplings requiring cutting and re-welding when the inner diameter is substandard, which is cumbersome, wasteful, and prone to precision deviations and workpiece deformation due to secondary welding. This device uses a pipe-end bearing clamping method to fix the workpiece, preventing deformation of the bellows body under pressure. Through staggered half-gear transmission and a motor operating in both directions, it drives the upper and lower sliding cutter blocks to reciprocate broach the inner walls of both ends of the coupling for rework. Simultaneously, the core rod adjusts the extension and retraction stroke of the cutter blocks to precisely control the broached outer diameter, adapting to the repair work of workpieces with different dimensional deviations. It eliminates the need for secondary welding and reassembly, simplifying the rework process and improving the accuracy and efficiency of coupling inner diameter rework.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a broaching machine for the inner hole of a metal bellows end connector, comprising a broaching machine body and a broaching mechanism, wherein the broaching mechanism is disposed on the top of the broaching machine body; The broaching mechanism includes a broach main rod, a broach groove, a sliding tool block, an arc ring, and a buffer surface. The broach groove is located on the inner side of the broach main rod, the sliding tool block slides on the inner side of the broach groove, the arc ring rotates on the inner side of the broach main rod, and the buffer surface is located on the outer side of one end of the broach main rod. The arc ring is used to drive the sliding tool block to move outward, the sliding tool block is used to broach the metal bellows end connector, and the buffer surface is used to install the metal bellows end connector and to provide unilateral buffering during broaching.

[0008] Preferably, the broaching mechanism further includes a clamping module, which is installed on the top of the broaching machine body. A turntable is provided on the inner side of the clamping module, and a finished metal bellows coupling is provided on the inner side of the turntable. A first stepper motor is installed inside the broaching machine body. The top output end of the first stepper motor passes through the broaching machine body and is equipped with a conventional rod. A second half gear is installed on the outer side of the conventional rod.

[0009] Preferably, a first half gear is installed at the outer top of the conventional rod, and a protective cover is installed on the top of the broaching bed body. The protective cover is located outside the first half gear, the second half gear and the conventional rod.

[0010] Preferably, a lifting head is installed on the top rear side of the broaching machine body, a buffer surface is installed on the outer side of the output end of the lifting head, the top end of the broaching main rod passes through the buffer surface and slides on the inner side of the buffer surface, and a limiting ring is installed on the top of the broaching main rod.

[0011] Preferably, a second stepper motor is installed on the top of the buffer surface, an external threaded tube is installed on the outer side of the main bar of the cutter, an internal threaded tube is provided on the outer side of the external threaded tube, the internal threaded tube is threadedly connected to the external threaded tube, two turntables are installed on the outer side of the internal threaded tube, small toothed rings are installed on the inner side of the two turntables, the small toothed rings are sleeved on the outer side of the internal threaded tube, and a limit shaft is rotatably connected to the outer side of the two turntables.

[0012] Preferably, the second stepper motor, the main puller rod, the buffer smooth surface, the limiting shaft, the turntable, the small gear ring, the internally threaded pipe fitting, and the externally threaded pipe fitting are all located inside the output end of the lifting head, so that the lifting head can drive the second stepper motor, the main puller rod, the buffer smooth surface, the limiting shaft, the turntable, the small gear ring, the internally threaded pipe fitting, and the externally threaded pipe fitting to move upward. The outer side of the main puller rod is provided with multiple puller slide grooves at equal intervals. Each puller slide groove is slidably connected to a sliding blade block on its inner side. Multiple limiting base blocks are installed at equal intervals on the inner side of the puller slide groove. Multiple limiting sliders are installed at equal intervals on both sides of the sliding blade block. The multiple limiting sliders slide on the inner side of the adjacent limiting base blocks respectively.

[0013] Preferably, the inner sides of the plurality of sliding blade blocks are provided with arc surfaces, the inner side of the arc ring is provided with a core rod, the top end of the core rod is provided at the bottom output end of the second stepper motor, and the arc ring rotates within the inner side of the plurality of arc surfaces and the main puller rod.

[0014] Preferably, the main puller rod, external threaded pipe fitting, internal threaded pipe fitting, limiting ring, puller guard ring, limiting shaft, puller slide groove, limiting base block, sliding blade block, limiting slider, turntable and small gear ring are combined to form a puller module structure. Another set of puller module structures is provided at the bottom of the puller module structure. The other set of puller module structures has the opposite component layout to the puller module structure and is located at the bottom of the puller module structure.

[0015] Preferably, the first half gear meshes with the top small gear ring, the second half gear meshes with the bottom small gear ring, and a buffer smooth surface is provided on the outer side of the other end of the broach main rod.

[0016] Preferably, a first fixing frame is installed on the inner side of the broaching machine body, a second fixing frame is installed at the bottom of the first fixing frame, the bottom limiting pivot is installed on the inner side of the first fixing frame, the bottom end of the bottom broach main rod is slidably connected to the inner side of the second fixing frame, an opening is opened at the top of the broaching machine body, and the bottom broach main rod is located inside the opening.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This device eliminates the need for cutting and secondary welding of bellows couplings with substandard dimensions, significantly simplifying the rework process, reducing material waste and precision errors caused by secondary welding. It employs a pipe-end bearing clamping and positioning structure to avoid deformation of the bellows body during clamping, protecting the workpiece's structural shape. Through staggered half-gear transmission and motor forward / reverse rotation, it achieves alternating reciprocating broaching of the upper and lower inner walls of the coupling, resulting in complete rework coverage and uniform processing. Combined with a core rod linkage adjustment structure, the working outer diameter of the broach can be precisely controlled, adapting to rework conditions with different inner diameter deviations. It boasts high processing adaptability and precision, avoiding the numerous drawbacks of traditional rework methods that involve cutting and secondary welding, such as complex processes, easy workpiece deformation, unstable secondary welding quality, and poor dimensional correction accuracy. This improves the efficiency of bellows coupling inner diameter rework, the finished product qualification rate, and the aesthetic appearance of the product. Attached Figure Description

[0018] Figure 1 This is a perspective view of the main structure of a metal bellows end connector inner hole broaching machine according to the present invention; Figure 2 This is a three-dimensional exploded view of the structure in the metal bellows end connector inner hole broaching equipment of the present invention; Figure 3 This is a three-dimensional view of the broaching mechanism in a metal bellows end-joint inner hole broaching equipment according to the present invention; Figure 4 This is a three-dimensional exploded view of the broaching mechanism in a metal bellows end-joint broaching equipment according to the present invention. Figure 5 for Figure 4 Enlarged view of point A in the image; Figure 6 This is a partially exploded perspective view of the broaching mechanism in a metal bellows end-joint inner hole broaching processing equipment according to the present invention; Figure 7 for Figure 6 Enlarged view of point B in the image; Figure 8 This is a diagram illustrating the arc ring used in a metal bellows end-joint inner hole broaching machine according to the present invention. Figure 9 A partial structural cross-sectional view of a metal bellows end-joint inner hole broaching machine according to the present invention; Figure 10 for Figure 9 Enlarged view of point C in the image; Figure 11 This is a diagram showing the loading status of a metal bellows end-joint inner hole broaching processing equipment according to the present invention.

[0019] In the diagram: 1. Broaching machine body; 2. Broaching mechanism; 201. Clamping module; 202. Finished metal bellows coupling; 203. First stepper motor; 204. Traditional rod; 205. First half gear; 206. Second half gear; 207. Second stepper motor; 208. Broach main rod; 209. External threaded pipe fitting; 210. Internal threaded pipe fitting; 211. Limiting ring; 212. Broach guard ring; 213. Limiting shaft; 214. Broach slide groove; 215. Limiting base block; 216. Sliding tool block; 217. Limiting slider; 218. Core rod; 219. Arc ring; 220. Arc surface; 221. First fixed frame; 222. Second fixed frame; 223. Protective cover; 224. Turntable; 225. Small gear ring; 226. Buffer smooth surface; 3. Lifting head; 4. Opening. Detailed Implementation

[0020] 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.

[0021] Example 1, according to Figure 1 - Figure 9As shown, a broaching machine for the inner hole of a metal bellows end connector includes a broaching machine body 1 and a broaching mechanism 2. The broaching mechanism 2 is disposed on the top of the broaching machine body 1. The broaching mechanism 2 includes a broach main rod 208, a broach groove 214, a sliding tool block 216, an arc ring 219, and a buffer surface 226. The broach groove 214 is formed inside the broach main rod 208. The sliding tool block 216 slides inside the broach groove 214. The arc ring 219 rotates inside the broach main rod 208. The buffer surface 226 is formed outside one end of the broach main rod 208. The arc ring 219 is used to drive the sliding tool block 216 to move outward. The sliding tool block 216 is used to broach the metal bellows end connector. The buffer surface 226 is used to install the metal bellows end connector and to smooth its surface. The broaching mechanism 2 also includes a clamping module 201, which acts as a unilateral buffer during broaching. The clamping module 201 is mounted on the top of the broaching machine body 1. A turntable 224 is provided on the inner side of the clamping module 201, and a finished metal bellows coupling 202 is provided on the inner side of the turntable 224. A first stepper motor 203 is installed inside the broaching machine body 1. The top output end of the first stepper motor 203 passes through the broaching machine body 1 and is mounted on a conventional rod 204. A second half-gear 206 is mounted on the outer side of the conventional rod 204, and a first half-gear 205 is mounted on the top of the conventional rod 204. A protective cover 223 is installed on the top of the broaching machine body 1, located outside the first half-gear 205, the second half-gear 206, and the conventional rod 204. The top of the broaching machine body 1 is rear... A lifting head 3 is mounted on the side. A buffer surface 226 is mounted on the outer side of the output end of the lifting head 3. The top end of the puller main rod 208 passes through the buffer surface 226 and slides on the inner side of the buffer surface 226. A limit ring 211 is mounted on the top of the puller main rod 208. A second stepper motor 207 is mounted on the top of the buffer surface 226. An external threaded pipe fitting 209 is mounted on the outer side of the puller main rod 208. An internal threaded pipe fitting 210 is provided on the outer side of the external threaded pipe fitting 209. The internal threaded pipe fitting 210 is threadedly connected to the external threaded pipe fitting 209. Two turntables 224 are mounted on the outer side of the internal threaded pipe fitting 210. Small gear rings 225 are mounted on the inner side of the two turntables 224. The small gear rings 225 are sleeved on the outer side of the internal threaded pipe fitting 210. A rotatable limiting shaft 213 is connected to the second stepper motor 207, the main cutter rod 208, the buffer smooth surface 226, the limiting shaft 213, the turntable 224, the small gear ring 225, the internally threaded pipe fitting 210, and the externally threaded pipe fitting 209 are all located inside the output end of the lifting head 3. This allows the lifting head 3 to drive the second stepper motor 207, the main cutter rod 208, the buffer smooth surface 226, the limiting shaft 213, the turntable 224, the small gear ring 225, the internally threaded pipe fitting 210, and the externally threaded pipe fitting 209 to move upward. Multiple cutter grooves 214 are equidistantly spaced on the outer side of the main cutter rod 208. Each cutter groove 214 has a sliding cutter block 216 slidably connected to its inner side, and multiple limiting base blocks 215 are equidistantly installed on the inner side of the cutter groove 214.Multiple limiting sliders 217 are equidistantly mounted on both sides of the sliding cutter block 216. These limiting sliders 217 slide within adjacent limiting base blocks 215. Each sliding cutter block 216 has an arc surface 220 on its inner side. A core rod 218 is mounted on the inner side of an arc ring 219. The top of the core rod 218 is mounted at the bottom output end of the second stepper motor 207. The arc ring 219 rotates within the arc surfaces 220 and the main cutter rod 208.

[0022] The overall effect of Embodiment 1 is as follows: After the metal bellows and pipe ends are welded to form the finished metal bellows coupling 202, an endoscopic dimensional quality inspection is required. When the inspection reveals that the inner diameter of the coupling is smaller than the process standard and there is a dimensional deviation, in order to avoid the cumbersome process, material loss, and reduced welding accuracy caused by cutting the workpiece and re-welding and assembling it in the traditional rework method, the unqualified coupling is placed vertically inside the turntable 224 inside the clamping module 201. The clamping module 201 is activated to complete the workpiece positioning and clamping. Relying on the exclusive inner groove structure design of the turntable 224, the clamping force and the weight of the workpiece are both borne by the pipe ends of the coupling, avoiding deformation damage caused by pressure and force on the main body of the bellows, and ensuring the workpiece With the main structure intact and the workpiece clamped and fixed, the lifting head 3 is activated to drive the top broach module downwards. At this time, the coupling is stably positioned inside the turntable 224, and its bottom is fitted onto the outer side of the buffer smooth surface 226 of the bottom broach module. During the downward movement of the top broach module, the end arc ring 219 is precisely inserted into the center position of the bottom broach module. The arc ring 219 slides smoothly along the corresponding mating arc surface 220 to the bottom, so that the top broach module and the buffer smooth surface 226 of the bottom broach module are precisely mated. At this time, the bottom of the coupling is fitted onto the outer side of the bottom buffer smooth surface 226, and the top is fitted onto the outer side of the top buffer smooth surface 226. The upper and lower ends of the workpiece are positioned and mated, completing the pre-rework assembly preparation work. After assembly, the first step of power supply is activated. Machine 203 drives the rotating rod to rotate, which synchronously drives the first half gear 205 and the second half gear 206 to rotate. Due to the staggered tooth arrangement of the two sets of half gears, the top and bottom small gear rings 225 are driven to operate independently and in staggered shifts. When the top small gear ring 225 rotates, the internal threaded pipe fitting 210 and the turntable 224 rotate synchronously. The turntable 224 rotates stably with the limit shaft 213 to ensure the coaxiality and operational stability of the overall transmission structure. The rotation of the internal threaded pipe fitting 210 drives the external threaded pipe fitting 209 to move axially upward through the threaded transmission, which synchronously drives the broach main rod 208 and the sliding cutter block 216 to move upward. The upward sliding cutter block 216 is used to perform friction broaching on the inner wall of the upper end of the coupling to complete the coupling. During the secondary rework of the inner diameter of the top of the coupling, the second half gear 206 engages with the bottom small gear ring 225 while maintaining rotation in the same direction. This drives the bottom sliding cutter block 216 to feed to the inner side of the bottom end of the coupling. Then, the first step motor 203 is started in reverse, and the second half gear 206 reverses to drive the bottom small gear ring 225 to rotate, driving the bottom sliding cutter block 216 back to its initial position, completing the broaching operation of the inner wall of the bottom end of the coupling. At the same time, the first half gear 205 reverses synchronously, driving the top sliding cutter block 216 to reset to the inner side of the upper end of the coupling. By switching the forward and reverse rotation of the motor, the sliding cutter block 216 reciprocates at the upper and lower ends of the coupling, completing the cyclic and precise broaching rework of the inner diameter of both ends of the coupling.

[0023] Example 2, according to Figure 2 - Figure 11 As shown, the main broach 208, externally threaded pipe fitting 209, internally threaded pipe fitting 210, limiting ring 211, broach guard ring 212, limiting rotating shaft 213, broach slide groove 214, limiting base block 215, sliding blade block 216, limiting slider 217, turntable 224, and small gear ring 225 are combined to form a broach module structure. Another broach module structure is located at the bottom of the broach module structure. This other broach module structure has the opposite component layout to the broach module structure and is located at the bottom of the broach module structure. The first half gear 205 is connected to the top... The small gear 225 meshes with the second half gear 206 and the bottom small gear 225. A buffer smooth surface 226 is provided on the outer side of the other end of the broach main rod 208. A first fixed frame 221 is installed on the inner side of the broaching machine body 1. A second fixed frame 222 is installed at the bottom of the first fixed frame 221. The bottom limiting shaft 213 is installed on the inner side of the first fixed frame 221. The bottom end of the bottom broach main rod 208 is slidably connected to the inner side of the second fixed frame 222. An opening 4 is provided on the top of the broaching machine body 1. The bottom broach main rod 208 is located on the inner side of the opening 4.

[0024] The effect achieved by the entire embodiment 2 is as follows: During the broaching process, the second stepper motor 207 can drive the core rod 218 to rotate. The rotation of the core rod 218 changes the contact position between the outer arc ring 219 and the arc surface 220, and precisely adjusts the extension and retraction stroke of the sliding tool block 216 inside the broach slide groove 214. This allows for flexible adjustment of the overall working outer diameter of the broach module, adapting to the rework requirements of couplings with different inner diameter deviations, and achieving refined and precise broaching finishing operations.

[0025] The working principle of the entire equipment is as follows: When the metal bellows and its pipe end are welded to form the finished metal bellows coupling 202, if its inner diameter drawing dimension is lower than the standard value during quality inspection, in order to avoid repeated welding and assembly after cutting, it is placed vertically in the turntable 224 opened inside the clamping module 201. The clamping module 201 is activated to clamp and fix it. Through the special inner groove shape of the turntable 224, when the clamping module 201 clamps the metal bellows coupling, the clamping weight is borne by its pipe end, avoiding deformation of the metal bellows due to stress. After the clamping work is completed, the lifting head 3 is activated to drive the broaching module structure to move downward synchronously. At this time, the metal bellows coupling is located inside the turntable 224 and on the bottom broaching module structure. On the outer side of the buffer smooth surface 226, when the lifting head 3 drives the top drawer module structure to move downward, the arc ring 219 inserts into the inner center position of the bottom drawer module structure, so that the arc ring 219 moves closely to each arc surface 220 towards the bottom of the bottom drawer module structure, and finally the top drawer module structure contacts the buffer smooth surface 226 on the bottom drawer module structure. At this time, the bottom sleeve of the metal bellows coupling is located on the outer side of the buffer smooth surface 226 on the bottom drawer module structure, and the top sleeve of the metal bellows coupling is located on the outer side of the buffer smooth surface 226 on the top drawer module structure. At this time, the installation and preparation work is completed. The first stepper motor 203 is turned on to drive the traditional rod 204 to rotate, so that the traditional rod 204 synchronously drives the first half gear 2. The rotation of the first half gear 205 and the second half gear 206 drives the rotation of the top and bottom small gear rings 225, respectively. Because the teeth of the first half gear 205 and the second half gear 206 are staggered, the top and bottom small gear rings 225 rotate separately. When the top small gear ring 225 rotates, it rotates synchronously with the internal threaded pipe fitting 210 and the turntable 224. The turntable 224 rotates within the limiting shaft 213 to ensure the overall stability of the small gear ring 225, the internal threaded pipe fitting 210, and the turntable 224. When the internal threaded pipe fitting 210 rotates, it drives the external threaded pipe fitting 209 to move upwards through the threaded connection. The external threaded pipe fitting 209 synchronously drives the broaching main rod 208 to move upwards. This causes the sliding cutter block 216 to move upwards. Through friction within the metal bellows coupling, the sliding cutter block 216 performs a secondary broaching rework on the top end of the metal bellows coupling. Simultaneously, the conventional rod 204 drives the second half-gear 206 to rotate until it meshes with the bottom small gear ring 225. When the rotation directions of the second half-gear 206 and the first half-gear 205 are the same, the sliding cutter block 216 on the bottom broaching module structure is moved to the inner side of the bottom end of the metal bellows coupling. At this point, the first stepper motor 203 is started in reverse, causing the second half-gear 206 to rotate in the opposite direction, which in turn drives the small gear ring 225 to rotate in the opposite direction, thus causing the bottom sliding cutter block 216 to move downwards.This allows the bottom sliding cutter block 216 to perform broaching on the bottom of the metal bellows coupling. Simultaneously, because the conventional rod 204 is in a reverse state, the first half-gear 205 also reverses synchronously. The reversed first half-gear 205 drives the top small gear ring 225 to rotate in the opposite direction, causing the top sliding cutter block 216 to return to the inner top of the metal bellows coupling. This process is repeated to achieve broaching on the inner top and bottom of the metal bellows coupling. Furthermore, the second stepper motor 207 drives the core rod 218 to rotate, changing the contact position between its outer arc ring 219 and the arc surface 220, thus altering the sliding distance of the sliding cutter block 216 within the broach groove 214. This allows for precise adjustment of the working outer diameter of the entire broach module structure, enabling precise broaching adjustments.

[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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. A broaching machine for the inner hole of a metal bellows end connector, characterized in that: It includes a broaching machine body (1) and a broaching mechanism (2), wherein the broaching mechanism (2) is disposed on the top of the broaching machine body (1); The broaching mechanism (2) includes a broach main rod (208), a broach groove (214), a sliding tool block (216), an arc ring (219), and a buffer surface (226). The broach groove (214) is located inside the broach main rod (208). The sliding tool block (216) slides inside the broach groove (214). The arc ring (219) rotates inside the broach main rod (208). The buffer surface (226) is located outside one end of the broach main rod (208). The arc ring (219) is used to drive the sliding tool block (216) to move outward. The sliding tool block (216) is used to broach the metal bellows end joint. The buffer surface (226) is used to install the metal bellows end joint and to provide unilateral buffering during broaching.

2. The metal bellows end connector inner hole broaching equipment according to claim 1, characterized in that: The broaching mechanism (2) further includes a clamping module (201), which is installed on the top of the broaching machine body (1). A turntable (224) is provided on the inner side of the clamping module (201), and a finished metal bellows coupling (202) is provided on the inner side of the turntable (224). A first stepper motor (203) is installed inside the broaching machine body (1). The top output end of the first stepper motor (203) passes through the broaching machine body (1) and is equipped with a conventional rod (204). A second half gear (206) is installed on the outer side of the conventional rod (204).

3. The metal bellows end joint inner hole broaching equipment according to claim 2, characterized in that: The first half gear (205) is installed at the top outer side of the conventional rod (204), and a protective cover (223) is installed at the top of the tufting bed body (1). The protective cover (223) is located outside the first half gear (205), the second half gear (206) and the conventional rod (204).

4. The metal bellows end joint inner hole broaching equipment according to claim 3, characterized in that: The broaching machine body (1) is provided with a lifting head (3) on the top rear side. A buffer surface (226) is provided on the outer side of the output end of the lifting head (3). The top end of the broaching main rod (208) passes through the buffer surface (226) and slides on the inner side of the buffer surface (226). A limit ring (211) is provided on the top of the broaching main rod (208).

5. The metal bellows end-joint inner hole broaching equipment according to claim 4, characterized in that: A second stepper motor (207) is installed on the top of the buffer surface (226). An external threaded pipe fitting (209) is installed on the outside of the main bar (208). An internal threaded pipe fitting (210) is provided on the outside of the external threaded pipe fitting (209). The internal threaded pipe fitting (210) is threadedly connected to the external threaded pipe fitting (209). Two turntables (224) are installed on the outside of the internal threaded pipe fitting (210). Small toothed rings (225) are installed on the inside of the two turntables (224). The small toothed rings (225) are sleeved on the outside of the internal threaded pipe fitting (210). A limit shaft (213) is rotatably connected to the outside of the two turntables (224).

6. The metal bellows end-joint inner hole broaching equipment according to claim 5, characterized in that: The second stepper motor (207), the main puller rod (208), the buffer smooth surface (226), the limiting shaft (213), the turntable (224), the small gear ring (225), the internal threaded pipe fitting (210), and the external threaded pipe fitting (209) are all located inside the output end of the lifting head (3), so that the lifting head (3) can drive the second stepper motor (207), the main puller rod (208), the buffer smooth surface (226), the limiting shaft (213), the turntable (224), the small gear ring (225), the internal threaded pipe fitting (210), and the external threaded pipe fitting (209). 10) and the external threaded pipe fitting (209) move upward. Multiple puller grooves (214) are equidistantly provided on the outer side of the puller main rod (208). Each puller groove (214) is slidably connected to a sliding blade block (216) on its inner side. Multiple limiting blocks (215) are equidistantly installed on the inner side of the puller groove (214). Multiple limiting sliders (217) are equidistantly installed on both sides of the sliding blade block (216). The multiple limiting sliders (217) slide on the inner side of the adjacent limiting blocks (215).

7. The metal bellows end connector inner hole broaching equipment according to claim 6, characterized in that: The inner sides of the multiple sliding blade blocks (216) are provided with arc surfaces (220), and the inner side of the arc ring (219) is provided with a core rod (218). The top of the core rod (218) is installed at the bottom output end of the second stepper motor (207). The arc ring (219) rotates and is located inside the multiple arc surfaces (220) and the main puller rod (208).

8. The metal bellows end joint inner hole broaching equipment according to claim 7, characterized in that: The main bar (208), external threaded pipe fitting (209), internal threaded pipe fitting (210), limiting ring (211), broach guard ring (212), limiting rotating shaft (213), broach slide groove (214), limiting base block (215), sliding blade block (216), limiting slider (217), turntable (224) and small gear ring (225) are combined to form a broach module structure. Another broach module structure is provided at the bottom of the broach module structure. The layout of the other broach module structure is opposite to that of the broach module structure. The other broach module structure is located at the bottom of the broach module structure.

9. The metal bellows end joint inner hole broaching equipment according to claim 8, characterized in that: The first half gear (205) meshes with the top small gear ring (225), the second half gear (206) meshes with the bottom small gear ring (225), and a buffer smooth surface (226) is provided on the outer side of the other end of the main bar of the cutter (208).

10. The metal bellows end joint inner hole broaching equipment according to claim 9, characterized in that: The broaching machine body (1) is provided with a first fixed frame (221) on the inner side, and a second fixed frame (222) is provided at the bottom of the first fixed frame (221). The bottom limiting pivot (213) is located inside the first fixed frame (221). The bottom end of the bottom broaching main rod (208) is slidably connected to the inner side of the second fixed frame (222). The broaching machine body (1) is provided with an opening (4) at the top, and the bottom broaching main rod (208) is located inside the opening (4).

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