A riveting machine for exercise bicycle

Abstract

The application belongs to the technical field of exercise bikes, and discloses a riveting machine for an exercise bike, which comprises a riveting machine body, a hydraulic cylinder fixedly arranged in the riveting machine body, a riveting head fixedly connected to a movable end of the hydraulic cylinder, a plurality of foot pedals arranged below the riveting head, and a foot pedal core shaft fixedly connected to a center position of each foot pedal. The motor drives the rotating disc to realize 90-degree intermittent rotation, and the riveting head is driven by the hydraulic cylinder to complete the riveting operation of the foot pedal core shaft. Manual positioning is not needed, and human operation errors are avoided. Meanwhile, after riveting is completed, the threaded polishing cylinder can automatically polish the riveting part at the top end of the core shaft, effectively removing burrs and flash generated during riveting, so that the surface is smoother. The friction loss during subsequent use is reduced, riveting stress is dispersed, and fault hidden dangers such as cracks and looseness are reduced, so that the structural stability of the foot pedal is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of exercise bike technology, specifically a riveting machine for exercise bikes. Background Technology

[0002] In the field of sports science, exercise bikes are called "power bikes." They come in two types: upright and recumbent (also known as backrest) exercise bikes. They allow you to adjust the intensity (power) of your workout to achieve a fitness effect, hence the name exercise bike.

[0003] Exercise bikes, also known as cardio-training equipment, are a typical type of aerobic fitness equipment that simulates outdoor sports. They primarily promote cardiovascular exercise, accelerate metabolism, and enhance heart and lung function through prolonged, moderate-intensity exercise, thereby improving physical fitness. The foot pedals are a crucial component of the exercise bike. The user's movement on the pedals generates power through gear meshing. The metal foot pedals undergo riveting during production. A machine tool (riveting machine) and fieldbus control system are used to mechanically fix the connection between the foot pedal spindle and the pedal body. The riveting location is specifically at the center of the foot pedal, at the root where the metal spindle meets the aluminum alloy foot pedal housing. The spindle passes through the bearings and bushings inside the foot pedal, and is then secured with riveting to prevent the spindle from coming loose. The riveting process involves inserting the pre-riveted section at the end of the foot pedal spindle into the pedal assembly, then using a riveting machine to radially roll and flange the spindle end. This achieves a finished product where the spindle, bearings, bushings, and housing are locked together, preventing axial detachment and allowing rotation. Currently, the existing technology for riveting foot pedals generally uses a single-station manual placement and clamping (limiting the workpiece) combined with the downward pressure riveting of a hydraulic riveting machine. This inevitably leads to problems such as slow cycle time, poor consistency, and high labor costs. Furthermore, during the cold rolling process of the riveting machine, due to the uneven flow of the metal material under pressure, it is impossible to ensure that each riveting end face is flat and free of burrs. If such a situation occurs, the consequences are that the assembly is rough to the touch, the appearance is poor, and it affects the assembly of the dust cover, resulting in defective products. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention provides a riveting machine for exercise bikes.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a riveting machine for exercise bikes, comprising a riveting machine body, wherein the riveting machine body includes a fixed hydraulic cylinder, a riveting rotary head is fixedly connected to the movable end of the hydraulic cylinder, a plurality of foot pedals are provided below the riveting rotary head, a foot pedal spindle is fixedly connected to the center of each foot pedal, the riveting rotary head can intermittently engage with the top end of each foot pedal spindle, a T-shaped storage tube is clamped onto each foot pedal, a turntable is fixedly connected to the bottom end of each T-shaped storage tube, and a rotating fixing structure is provided together with the turntable and the body of each T-shaped storage tube for clamping and fixing each foot pedal located on the T-shaped storage tube; Each of the foot pedal spindles has a threaded grinding cylinder that can be rotatably connected to its top. The threaded grinding cylinder is passively moved to contact the foot pedal spindle by the reciprocating movement of the hydraulic cylinder, and is used to grind the top riveted part. The threaded grinding cylinder and the turntable are provided with a spring-loaded structure, which is used to eject the riveted and ground foot pedal and foot pedal spindle from the T-shaped storage tube.

[0006] Preferably, a rotating rod is fixedly connected to the bottom plate of the turntable, a motor is fixedly connected to the end of the rotating rod away from the turntable, and a chassis is fixedly connected to the housing of the motor.

[0007] Preferably, the rotating fixing structure includes a small motor fixedly connected to the top surface of the turntable, a shaft fixedly connected to the output shaft of the small motor, a circular disk fixedly connected to the end of the shaft away from the small motor, and a plurality of arc-shaped grooves are formed around the circular disk, and a T-shaped block is slidably connected in each arc-shaped groove. Each T-shaped block has a T-shaped plate fixedly connected to its bottom end rod. A ring plate is rotatably connected to the disc body of the circular disk. The plate body of each T-shaped plate is slidably connected to the plate body of the ring plate. Multiple support plates are fixedly connected around the bottom end plate body of the ring plate, and the bottom end plate body of each support plate is fixedly connected to the top end disc body surface of the turntable.

[0008] Preferably, a T-plate frame is fixedly connected to the end of each T-shaped plate away from the shaft, and clamping plates are slidably connected to both sides of the end of each T-plate frame away from the corresponding T-shaped plate. Two elastic telescopic rods are fixedly connected to one side of the two clamping plates, and the two clamping plates can be intermittently connected to the foot pedal. An arc-shaped groove is provided on one side of the T-shaped storage tube to be slidably connected to a portion of the two clamping plates.

[0009] Preferably, the inner wall of the threaded grinding cylinder is connected to a conical threaded rod, and an oblique connecting rod is fixedly connected to the rod body near the top and the movable end of the hydraulic cylinder. Four positioning arc-shaped plates are jointly fitted and connected to the outer wall of the threaded grinding cylinder, and a notched ring is fixedly connected to the end of each positioning arc-shaped plate away from the conical threaded rod.

[0010] Preferably, a shaped bracket is fixedly connected to the outer wall of the missing corner ring, and the plate at one end of the shaped bracket away from the missing corner ring is fixedly connected to the plate of the chassis.

[0011] Preferably, the pop-up structure includes an electric telescopic rod fixedly connected to the irregular bracket. The movable end of the electric telescopic rod is fixedly connected to a support plate on the irregular bracket. A corrugated pipe is fixedly connected between the two support plates. An irregular air pipe for gas flow is fixedly connected to the support plate fixedly mounted on the irregular bracket below.

[0012] Preferably, an annular sleeve is fixedly connected to the end of the irregularly shaped air tube away from the corrugated tube. The annular sleeve and the bottom plate of the turntable are rotatably connected. A T-shaped groove is provided on the top plate of the turntable at each of the T-shaped storage tubes.

[0013] Preferably, a second spring is fixedly connected to the bottom wall of each T-shaped groove in the turntable, and a top plate is fixedly connected to the top of each second spring.

[0014] Preferably, the top plate is slidably connected to the inner wall of the T-shaped groove, and the top plate is also intermittently connected to the inner wall of each T-shaped storage tube and the bottom end of the foot pedal spindle.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention uses a motor-driven turntable to achieve 90-degree intermittent rotation, which, in conjunction with a hydraulic cylinder, drives the riveting head to complete the riveting operation of the foot pedal spindle. This eliminates the need for manual positioning, avoiding human error. Furthermore, after riveting, a thread grinding cylinder automatically grinds the riveted part at the top of the spindle, effectively removing burrs and flash generated during riveting, resulting in a smoother surface. This not only reduces frictional wear during subsequent use but also disperses riveting stress, reducing the risk of cracks, loosening, and other malfunctions, and significantly improving the structural stability of the foot pedal. This invention uses a rotating fixed structure to drive a circular disk to rotate via a small motor. The arc-shaped inclined groove drives the T-shaped block and T-shaped plate to translate, thereby pushing the clamping plate to fix the foot pedal. During the clamping process, the elastic telescopic rod can prevent the workpiece from shifting during riveting. This adaptive clamping method replaces manual fixing, reduces labor intensity, and ensures the consistency of the workpiece position during each riveting. After grinding, the turntable rotates 45 degrees, and the electric telescopic rod squeezes the corrugated pipe to generate high-pressure gas. The gas is sent into the T-shaped groove through the special-shaped air pipe, which pushes the top plate to push the foot pedal out of the T-shaped storage cylinder, completing the automatic unloading. The unloaded workpiece can be attracted and transferred by the magnetic suction plate on the conveying component, realizing the full automation of the process from processing to unloading without manual intervention, and further improving the continuity of production. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall planar front view structure of the present invention; Figure 3 This is a schematic diagram of the overall bottom view of the small motor of the present invention; Figure 4 This is a schematic diagram of the arc-shaped inclined groove structure of the present invention; Figure 5 This is a schematic diagram of the oblique connecting rod structure of the present invention; Figure 6 For the present invention Figure 5 A magnified view of the structure at point A in the middle; Figure 7 This is a top view schematic diagram of the cross-sectional planar structure of the foot pedal of the present invention; Figure 8 This is a partial top-view planar structural diagram of the present invention; Figure 9 This is a schematic diagram of the positioning arc corner plate structure of the present invention; Figure 10 This is a schematic diagram of a partial cross-sectional structure of the turntable of the present invention; Figure 11 For the present invention Figure 10 A magnified schematic diagram of the structure at point B in the middle.

[0017] In the picture: 1. Riveting machine body; 101. Hydraulic cylinder; 102. Riveting rotor; 103. Foot pedal; 104. Foot pedal spindle; 2. Chassis; 201. Motor; 202. Rotating rod; 203. Turntable; 204. T-shaped storage cylinder; 205. Small motor; 206. Shaft; 207. Circular disc; 208. Arc-shaped inclined groove; 209. T-shaped block; 210. T-shaped plate; 211. Ring plate; 212. Support plate; 213. T-plate frame; 214. Clamping plate; 215. Elastic telescopic rod; 216. Diagonal connecting rod; 217. Conical threaded rod; 218. Thread grinding cylinder; 219. Irregular bracket; 220. Notched corner ring; 221. Positioning arc corner plate; 223. Electric telescopic rod; 224. Support plate; 225. Corrugated pipe; 226. Irregular air pipe; 227. Annular sleeve plate; 228. T-shaped circular groove; 229. Spring II; 230. Top plate. Detailed Implementation

[0018] 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.

[0019] like Figures 1 to 11 As shown, the present invention provides a riveting machine for exercise bikes, including a riveting machine body 1. The riveting machine body 1 includes a fixed hydraulic cylinder 101. A riveting head 102 is fixedly connected to the movable end of the hydraulic cylinder 101. A plurality of foot pedals 103 are provided below the riveting head 102. A foot pedal spindle 104 is fixedly connected to the center of each foot pedal 103. The riveting head 102 can intermittently fit and connect with the top of each foot pedal spindle 104. A T-shaped storage tube 204 is clamped on each foot pedal 103. A turntable 203 is fixedly connected to the bottom end of each T-shaped storage tube 204. The turntable 203 and the cylinder of each T-shaped storage tube 204 are provided with a rotating fixing structure for clamping and fixing each foot pedal 103 located on the T-shaped storage tube 204. A rotating rod 202 is fixedly connected to the bottom plate of the turntable 203. A motor 201 is fixedly connected to the end of the rotating rod 202 away from the turntable 203. A base plate 2 is fixedly connected to the housing of the motor 201. The rotating rod 202 and the turntable 203 are driven to rotate by the motor 201. The rotating and fixed structure includes a small motor 205 fixedly connected to the top plate of the turntable 203. A shaft 206 is fixedly connected to the output shaft of the small motor 205. A circular plate 207 is fixedly connected to the end of the shaft 206 away from the small motor 205. Multiple arc-shaped inclined grooves 208 are circumferentially formed on the plate of the circular plate 207. A T-shaped block 209 is slidably connected in each arc-shaped inclined groove 208. A T-shaped plate 210 is fixedly connected to the bottom plate of each T-shaped block 209. The circular plate 207 is rotatably connected to... There is a ring plate 211, and the plate body of each T-shaped plate 210 is slidably connected to the plate body of the ring plate 211. Multiple support plates 212 are fixedly connected around the bottom plate body of the ring plate 211, and the bottom plate body of each support plate 212 is fixedly connected to the top plate surface of the turntable 203. A T-plate frame 213 is fixedly connected to the plate body of each T-shaped plate 210 away from the shaft 206. Clamping plates 214 are slidably connected to the plates on both sides of the end of each T-plate frame 213 away from the corresponding T-shaped plate 210. Two elastic telescopic rods 215 are fixedly connected to the plate body on the side of the two clamping plates 214 that are close to each other, and the two clamping plates 214 can be intermittently connected to the foot pedal 103. An arc groove is opened on one side of the T-shaped storage tube 204 to be slidably connected to a part of the plate body of the two clamping plates 214.

[0020] Using the above method: Workers sequentially place multiple foot pedals 103 into the corresponding T-shaped storage cylinders 204 (one of the T-shaped storage cylinders 204 is temporarily left empty of foot pedals 103), such as... Figure 2 As shown, by starting the motor 201 on the chassis 2, the rotating rod 202 and the turntable 203 are driven to rotate synchronously. The motor 201, as the power source, is pre-programmed with existing technology so that the turntable 203 stops rotating after each passive rotation of 90 degrees. This, in conjunction with the hydraulic cylinder 101 on the riveting machine body 1, drives the riveting head 102 to rotate and move downward, riveting the top of the foot pedal spindle 104 inside the foot pedal 103, thus riveting the two together. Figure 3 and Figure 4As shown, when the turntable 203 rotates passively, the small motor 205 fixed on its top surface is synchronously and passively started, driving the shaft 206 and its fixed circular disk 207 to rotate in the opposite direction to the turntable 203. This causes the multiple arc-shaped grooves 208 on the circular disk 207 to rotate synchronously and passively, driving the T-shaped blocks 209 within the groove walls to slide in a limiting and guiding manner. Thus, one end of the arc-shaped groove 208 contacts the other end, pushing the T-shaped plate 210 at the bottom of the T-shaped block 209 to move in a guiding translation under the limiting of the ring plate 211. Multiple support plates 212 installed on the bottom of the ring plate 211 are fixed to the turntable 203, providing support and positioning. The T-shaped plate 210, which passively extends from the ring plate 211, synchronously drives the pushing of the T-plate frame 213. Figure 6 and Figure 7 As shown, the passively translating T-plate frame 213 translates on the plates of the two clamping plates 214. After moving past the smooth protrusions of the two clamping plates 214, the elastic telescopic rod 215 fixed between the two clamping plates 214 will immediately retract, changing the original state of the rod being resisted and elastically stretched. When the T-plate frame 213 passes through the smooth protrusions of the clamping plates 214 and gets closer to the foot pedal 103, the elastic telescopic rod 215 will immediately retract and reset after the resistance is gone, so that the two clamping plates 214 will once again contact the two ends of the T-plate frame 213. At the same time, the two elastic telescopic rods 21... The retraction of 5 will also cause the two clamping plates 214 to contact the local cylindrical plate part of the foot pedal 103, fixing and limiting it, effectively preventing the foot pedal spindle 104 and foot pedal 103 from being displaced by fluctuations when the riveting head 102 rivets the foot pedal spindle 104. This more automatically replaces the manual operation of fixing it. Then the turntable 203 rotates 90 degrees again, so that the foot pedal 103 that has not been riveted replaces the position of the foot pedal 103 that has been riveted. At this time, the staff can put the foot pedal 103 into the T-shaped storage tube 204 that was not previously put into the foot pedal 103 for replenishment.

[0021] A threaded grinding cylinder 218 is provided above the turntable 203. The threaded grinding cylinder 218 is passively moved to contact the foot pedal spindle 104 by the reciprocating movement of the hydraulic cylinder 101, and is used to grind the top riveted part. A tapered threaded rod 217 is threadedly connected to the inner wall of the threaded grinding cylinder 218. An oblique connecting rod 216 is fixedly connected to the rod near the top of the tapered threaded rod 217 and the movable end of the hydraulic cylinder 101. Four positioning arc-shaped plates 221 are attached to the outer wall of the tapered threaded rod 217 and the threaded grinding cylinder 218. A notched ring 220 is fixedly connected to the end of each positioning arc-shaped plate 221 away from the tapered threaded rod 217. A shaped bracket 219 is fixedly connected to the outer wall of the notched ring 220. The end of the shaped bracket 219 away from the notched ring 220 is fixedly connected to the disc of the chassis 2.

[0022] The above solution is adopted: such as Figure 5 and Figure 8 , Figure 9 As shown, when the hydraulic cylinder 101 drives the riveting head 102 to move downward, the extension of the movable end will also simultaneously drive the inclined connecting rod 216 and the tapered thread rod 217 to move downward. The downward movement of the tapered thread rod 217 will drive the threaded grinding cylinder 218 to move downward simultaneously, thereby causing the bottom end of the threaded grinding cylinder 218 to contact the top end of the riveted foot pedal spindle 104 (at this time, the riveted foot pedal spindle 104 has been passively rotated 90 degrees by the turntable 203). During the synchronous downward movement of the tapered threaded rod 217 and the thread grinding cylinder 218, they continuously slide against and engage with multiple positioning arc-shaped plates 221 installed within the notched ring 220. Then, as the hydraulic cylinder 101 continues to drive the downward movement, the force received by the tapered threaded rod 217 moves downward within the thread grinding cylinder 218, causing the thread grinding cylinder 218 to rotate at a fixed point on the top of the foot pedal spindle 104, thereby achieving the riveting of the foot pedal spindle 104. The rotational grinding of the joint effectively removes burrs, flash, and micro-unevenness generated during the riveting process. Without structural grinding, if there are sharp edges or stress concentration points at the riveting joint, long-term stress can easily lead to micro-cracks or loosening. Grinding can smoothly transition these areas, evenly distribute mechanical stress, improve the fatigue resistance of the joint, and reduce the risk of loosening or breakage during use. When the movable end of the hydraulic cylinder 101 returns to its original position and moves upward, the conical thread rod 217 and the thread grinding cylinder 218 move upward simultaneously until the top part of the thread grinding cylinder 218 contacts multiple positioning arc plates 221. The presence of multiple positioning arc plates 221 exerts a resistance pressure on the passively moving and returning thread grinding cylinder 218. At that time, under the action of continuous upward force, the thread grinding cylinder 218 will be rotated on the rod of the conical thread rod 217, thereby shortening the thread engagement part with the conical thread rod 217 and returning to the initial state.

[0023] Furthermore, a pop-up structure is provided between the thread grinding cylinder 218 and the turntable 203 to eject the riveted and ground foot pedal 103 and foot pedal spindle 104 from the T-shaped storage cylinder 204. The conveying assembly located on the side of the turntable 203 is used to transfer the processed and riveted workpiece, and the magnetic suction plate installed on the conveying assembly is used to attract the metal workpiece and make it adhere to the conveying assembly. The pop-up structure includes an electric telescopic rod 223 fixedly connected to a shaped bracket 219. A support plate 224 is fixedly connected to the movable end of the electric telescopic rod 223 and the shaped bracket 219, respectively. A corrugated pipe 225 is fixedly connected between the two support plates 224. A shaped air pipe 226 for gas flow is fixedly connected to the support plate 224 fixedly mounted on the shaped bracket 219 below. An annular sleeve plate 227 is fixedly connected to the end of the air pipe 226 away from the corrugated pipe 225. The annular sleeve plate 227 and the turntable 203 are also connected. The bottom plate is rotated and sleeved, and a T-shaped groove 228 is opened on the top plate surface of the turntable 203 at each T-shaped storage tube 204. A spring 229 is fixedly connected to the bottom groove wall of each T-shaped groove 228 in the turntable 203, and a top plate 230 is fixedly connected to the top of each spring 229. The plate body of the top plate 230 is in close sliding connection with the inner wall of the T-shaped groove 228, and the plate body of the top plate 230 is also intermittently in close contact with the inner wall of each T-shaped storage tube 204 and the bottom end of the foot pedal spindle 104.

[0024] The above solution is adopted: such as Figure 10 and Figure 11After the riveted foot pedal spindle 104 is ground by the threaded grinding cylinder 218, when the turntable 203 is passively rotated 45 degrees, the electric telescopic rod 223 installed on the irregular bracket 219 is activated by the computer programming system, causing its movable end to move down and drive a support plate 224 fixed to it to move down, thereby squeezing the bellows 225 and causing a sudden squeezing gas to be generated in its inner cavity. The gas will directly enter the irregular air pipe 226 fixed on the lower support plate 224, thereby passively rotating to a 45-degree angle. The turntable 203, T-shaped storage cylinder 204, and corresponding foot pedal 103 and foot pedal spindle 104 (after grinding) are directly positioned at one end of the irregularly shaped air pipe 226 on the turntable 203. The gas ejected through the irregularly shaped air pipe 226 passes through the T-shaped groove 228 in the turntable 203 and directly pushes against the sliding top plate 230 in the T-shaped groove 228. The top plate 230, under pressure, moves directly upward into the cylindrical space of the T-shaped storage cylinder 204, simultaneously stretching the bottom... The spring 229 on the end deforms under force, facilitating the automatic reset of the top plate 230 when no force is applied. The top plate 230, rising under impact, pushes the foot pedal spindle 104, disengaging it and the foot pedal 103 from the T-shaped storage tube 204. It should be noted that when the foot pedal spindle 104, after being polished, is passively rotated, during the process of rotating from the polished area to a 45-degree angle, the small motor 205 will reverse, causing the two clamping plates 214 to be unable to engage. The foot pedal 103 provides additional clamping force, and the gas impact pressure generated by the force on the bellows 225 can completely make the foot pedal 103 bounce off the T-shaped storage tube 204. Since the ejected foot pedal 103 is made of metal, the conveying component is located directly above the foot pedal 103. Therefore, when it is suspended, it will be attracted by the magnetic plate installed on the conveying component and thus passively transported. Subsequently, the foot pedal 103 workpiece can be directly removed and stacked one by one at the other end of the conveying component. It is worth noting that: initially, the foot pedal 103 was placed into the T-shaped storage tube 204. The T-shaped storage tube 204 that was deliberately left empty was the one located below the thread grinding tube 218.

[0025] It is worth noting that: the foot pedal 103 was placed manually from one side during the entire riveting process. The entire process is automated. The motor 201 starts and drives the workpiece to rotate 90 degrees. The riveting head 102 moves down to rivet the workpiece. The thread grinding cylinder 218 moves down with the riveting head 102 and rotates and grinds the riveted workpiece synchronously. After grinding, the small motor 205 is passively rotated again at the same time. The reverse rotation releases the fixation of the workpiece. When the bellows 225 is rotated 45 degrees, the pressure generated by the force will cause the workpiece to break away from the T-shaped storage cylinder 204 and eject the workpiece.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A riveting machine for exercise bikes, comprising a riveting machine body (1), characterized in that: The riveting machine body (1) includes a fixed hydraulic cylinder (101). A riveting head (102) is fixedly connected to the movable end of the hydraulic cylinder (101). Multiple foot pedals (103) are provided below the riveting head (102). A foot pedal spindle (104) is fixedly connected to the center of each foot pedal (103). The riveting head (102) can intermittently fit and connect with the top of each foot pedal spindle (104). A T-shaped storage tube (204) is clamped on each foot pedal (103). A turntable (203) is fixedly connected to the bottom end of each T-shaped storage tube (204). The turntable (203) and the cylinder of each T-shaped storage tube (204) are provided with a rotating fixing structure for clamping and fixing each foot pedal (103) located on the T-shaped storage tube (204). Each of the foot pedal spindles (104) has a threaded grinding cylinder (218) that can be rotatably connected to its top. The threaded grinding cylinder (218) is passively moved to contact the foot pedal spindle (104) by the reciprocating movement of the hydraulic cylinder (101) for grinding the top riveted part. The threaded grinding cylinder (218) and the turntable (203) are provided with a spring-loaded structure for ejecting the riveted and ground foot pedal (103) and foot pedal spindle (104) from the T-shaped storage tube (204).

2. The riveting machine for exercise bikes according to claim 1, characterized in that: A rotating rod (202) is fixedly connected to the bottom plate of the turntable (203). A motor (201) is fixedly connected to the end of the rotating rod (202) away from the turntable (203). A chassis (2) is fixedly connected to the housing of the motor (201).

3. The riveting machine for exercise bikes according to claim 2, characterized in that: The rotating fixed structure includes a small motor (205) fixedly connected to the top surface of the turntable (203). A shaft (206) is fixedly connected to the output shaft of the small motor (205). A circular disk (207) is fixedly connected to the end of the shaft (206) away from the small motor (205). Multiple arc-shaped grooves (208) are opened around the disk body of the circular disk (207). A T-shaped block (209) is slidably connected in each arc-shaped groove (208). Each T-shaped block (209) has a T-shaped plate (210) fixedly connected to its bottom end rod. The circular disk (207) has a ring plate (211) rotatably connected to its disk body. Each T-shaped plate (210) is slidably connected to the ring plate (211). Multiple support plates (212) are fixedly connected around the bottom end plate of the ring plate (211), and the bottom end plate of each support plate (212) is fixedly connected to the top end disk surface of the turntable (203).

4. The riveting machine for exercise bikes according to claim 3, characterized in that: Each T-shaped plate (210) has a T-plate frame (213) fixedly connected to one end of the plate away from the shaft (206). Each T-plate frame (213) has a clamping plate (214) slidably connected to both sides of the end of the plate away from the corresponding T-shaped plate (210). Two elastic telescopic rods (215) are fixedly connected to one side of the two clamping plates (214). The two clamping plates (214) can be intermittently connected to the foot pedal (103). An arc groove is provided on one side of the T-shaped storage tube (204) to be slidably connected to a portion of the plates of the two clamping plates (214).

5. The riveting machine for exercise bikes according to claim 1, characterized in that: The inner wall of the threaded grinding cylinder (218) is threaded with a conical threaded rod (217). The conical threaded rod (217) near the top end and the movable end of the hydraulic cylinder (101) are jointly and fixedly connected with an oblique connecting rod (216). The outer wall of the conical threaded rod (217) and the threaded grinding cylinder (218) are jointly and fitted with four positioning arc-shaped plates (221). Each positioning arc-shaped plate (221) is jointly and fixedly connected with a notched ring (220) on the end plate away from the conical threaded rod (217).

6. The riveting machine for exercise bikes according to claim 5, characterized in that: A shaped bracket (219) is fixedly connected to the outer wall of the notched ring (220). The plate of the shaped bracket (219) away from the notched ring (220) is fixedly connected to the plate of the chassis (2).

7. The riveting machine for exercise bikes according to claim 6, characterized in that: The pop-up structure includes an electric telescopic rod (223) fixedly connected to the irregular bracket (219). The movable end of the electric telescopic rod (223) is fixedly connected to a support plate (224) on the irregular bracket (219). A corrugated pipe (225) is fixedly connected between the two support plates (224). The support plate (224) fixedly mounted on the irregular bracket (219) below is fixedly connected to an irregular air pipe (226) for gas flow.

8. The riveting machine for exercise bikes according to claim 7, characterized in that: An annular sleeve plate (227) is fixedly connected to the end of the irregular air tube (226) away from the corrugated tube (225). The annular sleeve plate (227) and the bottom plate of the turntable (203) are rotated and connected. A T-shaped circular groove (228) is opened on the top plate of the turntable (203) at each of the T-shaped storage tubes (204).

9. The riveting machine for exercise bikes according to claim 8, characterized in that: Each of the T-shaped grooves (228) in the turntable (203) is fixedly connected to the bottom wall of the groove, and a top plate (230) is fixedly connected to the top of each of the springs (229).

10. The riveting machine for exercise bikes according to claim 9, characterized in that: The top plate (230) is slidably connected to the inner wall of the T-shaped groove (228), and the top plate (230) is also intermittently connected to the inner wall of each T-shaped storage tube (204) and the bottom end of the foot pedal spindle (104).

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