Angle-adjustable bicycle frame welding and fixing tool

Abstract

The present invention relates to the field of welding and fixing equipment, and specifically to an angle-adjustable bicycle frame welding and fixing tool, comprising a base, a five-way fixing workpiece, a seat tube fixing workpiece, a head tube fixing workpiece and an adjustment tool, wherein the head tube fixing workpiece is installed on a movable seat, the movable seat is slidably installed on the base and moves horizontally along the radial direction of the five-way tube, and the adjustment tool comprises two vertically arranged support columns and two sliding seats, each sliding seat is provided with a clamping piece, and the clamping piece is provided with a horizontal shaft rod, which is rotatably installed in the sliding seat. In this technical solution, the sliding seat in the adjustment tool slides on the support column, and the clamping piece can rotate around the shaft rod, so that the tool can flexibly adjust the position and angle of the head tube, upper tube, down tube and other components of the frame according to the geometric shapes of different styles of bicycle frames, thereby adapting to the welding needs of various styles of frames.

Description

Technical Field

[0001] The invention relates to the field of welding and fixing equipment, in particular to an angle-adjustable bicycle frame welding and fixing tool. Background Art

[0002] At present, bicycles are a convenient means of transportation and are widely loved by people of all walks of life. In order to ensure the rigid structure of the bicycle frame during the processing, welding technology needs to be used for processing. During the welding process, a fixing device is needed to clamp the frame body for welding and fixing.

[0003] Because different bicycle frames have different geometries, the top and down tubes need to be aligned with the seat tube at different inclination angles when welding different bicycle frames. The clamping angles of the fixtures for different frames also need to be changed. Otherwise, the factory would need a large number of fixtures of different sizes, which would be costly. After aligning the various frame components, the clamps would need to be used to lock each frame component one by one to ensure the stability of the pipe during welding, which is a complicated operation. Summary of the Invention

[0004] In view of the above problems, it is necessary to provide an angle-adjustable bicycle frame welding and fixing tool to address the existing technical problems.

[0005] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0006] The adjusting device is characterized in that: the adjusting device is provided with a first locking unit for fixing the sliding seat to the supporting column and the second locking unit for locking the sliding seat.

[0007] Preferably, the first locking unit includes two piston cylinders vertically mounted on the movable seat, the piston cylinders are filled with hydraulic oil, a bottom column is coaxially mounted on the bottom of the piston cylinder, a first piston rod is coaxially mounted on the top of the piston cylinder, the top of the first piston rod is fixedly connected through a horizontal connecting seat, and a linear driver for driving the connecting seat to move along the axis of the piston cylinder is fixedly mounted on the outside of the piston cylinder; the two piston cylinders are connected by oil pipes at positions between the bottom column and the first piston rod, and the two oil pipes are respectively connected to the second locking units of the two sliding seats.

[0008] Preferably, the cross-section of the support column is rectangular, and limiting grooves are provided on both sides of the sliding seat. The sliding seat is slidably installed between the support columns through the limiting grooves. A through hole is provided on one side of the limiting groove. The second locking unit includes a locking block slidably installed in the sliding seat and flush with the through hole. When the locking block is in contact with the support column, the position of the sliding seat on the support column is locked.

[0009] Preferably, an inclined surface is provided at one end of the locking block away from the through hole, and the second locking unit includes a mounting seat arranged above the locking block, and a second piston rod extending vertically is slidably mounted on the bottom of the mounting seat. The mounting seat is provided with an oil channel above the second piston rod, and the oil pipe is connected to the oil channel on the sliding seat. The first piston rod moves downward to allow the hydraulic oil to enter the mounting seat through the oil pipe and push the second piston rod to move downward. The second piston rod moves downward in contact with the inclined surface of the locking block, pushing the locking block through the through hole to fit the support column.

[0010] Preferably, the inner wall of the sliding seat and the locking block are elastically connected by a first spring, and the elastic force of the first spring causes the locking block to move to the side away from the through hole. A limit block is provided in the sliding seat to limit the moving position of the locking block; a second spring is provided in the mounting seat, and the second spring is elastically connected to the second piston rod, and the elastic force of the second spring causes the second piston rod to move upward.

[0011] Preferably, the side of the support column facing the through hole is provided with friction lines, and the side of the locking block facing the support column is provided with friction lines.

[0012] Preferably, the width of the limiting groove is greater than the width of the supporting column, and balls are rotatably installed at both ends of the width of the limiting groove, and the balls protrude from the surface of the limiting groove and contact the outer wall of the supporting column.

[0013] Preferably, a guide sleeve is provided in the sliding seat, the shaft rod is inserted into the guide sleeve, and a friction ring is coaxially provided on the shaft rod. The third locking unit includes two clamping plates slidably installed in the sliding seat, and a "V"-shaped opening is provided on the clamping plate. The two clamping plates are staggered along the axis direction of the shaft rod, and the clamping plates are respectively arranged on both sides of the friction ring to make synchronous movements symmetrical about the axis of the friction ring; a vertically extending pressure relief chamber is provided on one side of the mounting seat, and the pressure relief chamber is connected to the oil channel through a pressure relief oil channel, and a pressure relief valve core for blocking the pressure relief oil channel is coaxially provided in the pressure relief chamber; a third piston rod extending vertically upward is provided on the clamping plate located above, and the third piston rod is inserted in the pressure relief chamber and coaxially connected to the pressure relief valve core.

[0014] Preferably, the two ends of the clamping plate are slidably mounted on the first slide rail provided in the sliding seat, and the two ends of the clamping plate are provided with horizontally extending connecting columns, which extend to the outside of the sliding seat through the vertically extending waist-shaped holes provided on the first slide rail and are connected to the rack slidably mounted on the outside of the sliding seat. The two racks at the same end of the two clamping plates are vertically arranged and meshed with the central gear rotatably mounted on the outside of the sliding seat; the axis of the central gear is horizontally arranged and perpendicular to the axis of the shaft.

[0015] Preferably, a guide rod extending vertically upward is provided on the top of the clamping plate located on the upper side. The guide rod is inserted into the sliding seat and extends to the outside of the sliding seat. A limit head is coaxially provided on the top of the guide rod. A third spring is sleeved on the guide rod. The third spring elastically connects the outside of the sliding seat and the limit head. The elastic force of the third spring causes the clamping plate to move upward.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] First, the head tube fixing workpiece in the present invention is installed on a movable seat that can move horizontally along the radial direction of the bottom bracket tube, and the sliding seat in the adjustment tool can slide on the support column. At the same time, the clamping part can rotate around the shaft, so that the tool can flexibly adjust the position and angle of the head tube, upper tube, down tube and other components of the frame according to the geometric shapes of different styles of bicycle frames, thereby adapting to the welding requirements of various styles of frames, and solving the problem that the existing equipment cannot adjust the clamping angle according to the geometry of the frame.

[0018] Secondly, in the present invention, the action of driving the first piston rod downward by the linear drive increases the oil pressure in the piston cylinder, thereby locking the position of the movable seat. The oil pressure is transmitted through the oil pipe to achieve locking of the position of the clamp by the second locking unit and locking of the rotation angle of the clamp by the third locking unit, thereby ensuring the stability of the various components of the frame during welding.

[0019] Third, the meshing transmission between the rack and the central gear enables precise, synchronous, and symmetrical, movement of the two clamping plates in opposite directions about the shaft axis. This precise movement ensures that the two clamping plates apply uniform clamping force to the friction ring, balancing the locking force on the shaft and preventing tilting or rotation of the shaft due to uneven force. This improves the accuracy of the clamp's rotational angle locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional welding fixture for bicycle frame with adjustable angle in unlocked state. Figure 1 ;

[0021] Figure 2 It is a three-dimensional welding fixture for bicycle frame with adjustable angle in unlocked state. Figure 2 ;

[0022] Figure 3 yes Figure 2 3D structural decomposition diagram;

[0023] Figure 4 yes Figure 3 A local enlarged view of point A;

[0024] Figure 5 It is a side view of an angle-adjustable bicycle frame welding fixture in an unlocked state;

[0025] Figure 6 yes Figure 5 A partial enlarged view of point B;

[0026] Figure 7 yes Figure 5 Cross-sectional view at CC of FIG;

[0027] Figure 8 yes Figure 7 A partial enlarged view of point D;

[0028] Figure 9 It is a side view of an angle-adjustable bicycle frame welding fixture in a locked state;

[0029] Figure 10 yes Figure 9 Cross-sectional view at EE of ;

[0030] Figure 11 yes Figure 10 A partial enlarged view of point F;

[0031] Figure 12 yes Figure 9 Cross-sectional view at GG.

[0032] The numbers in the figure are: 1. base; 11. bottom bracket fixing workpiece; 12. seat tube fixing workpiece; 13. head tube fixing workpiece; 131. moving seat; 14. first locking unit; 141. piston cylinder; 142. bottom column; 143. first piston rod; 144. connecting seat; 145. linear actuator; 147. oil pipe; 2. adjustment tool; 21. support column; 22. sliding seat; 221. limiting groove; 222. ball bearing; 223. through hole; 225. guide sleeve; 226. first slide rail; 227. waist-shaped hole; 228 , center gear; 23, clamping member; 231, shaft; 232, friction ring; 24, second locking unit; 241, locking block; 242, mounting seat; 243, second piston rod; 244, oil channel; 245, first spring; 246, second spring; 247, pressure relief chamber; 248, pressure relief oil channel; 249, pressure relief valve core; 25, third locking unit; 251, clamping plate; 252, third piston rod; 253, connecting column; 254, rack; 255, guide rod; 256, limit head; 257, third spring. DETAILED DESCRIPTION

[0033] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Reference Figures 1 to 12 :

[0035] An angle-adjustable bicycle frame welding fixture comprises a base 1, a five-way fixing workpiece 11 for horizontally fixing the five-way tube is provided on the base 1, a riser fixing workpiece 12 is provided above the five-way fixing workpiece 11, a head tube fixing workpiece 13 is provided on one side of the five-way fixing workpiece 11, the head tube fixing workpiece 13 is installed on a movable seat 131, the movable seat 131 is slidably installed on the base 1 and moves horizontally along the radial direction of the five-way tube, and a first locking unit 14 is provided on the movable seat 131 for locking the position of the movable seat 131; the base 1 is provided with an adjustment tool between the five-way fixing workpiece 11 and the head tube fixing workpiece 13 Device 2, the adjustment tool 2 includes two vertically arranged support columns 21, and two sliding seats 22 are slidably installed between the support columns 21. Each sliding seat 22 is provided with a clamping member 23 for clamping the upper tube and the lower tube, and the clamping member 23 is provided with a horizontal shaft rod 231 at one end facing the sliding seat 22. The axis of the shaft rod 231 is parallel to the five-way tube fixed by the five-way fixing workpiece 11, and the shaft rod 231 is rotatably installed in the sliding seat 22. The sliding seat 22 is provided with a second locking unit 24 for fixing the position of the sliding seat 22 on the support column 21, and a third locking unit 25 for locking the rotation angle of the shaft rod 231.

[0036] When using this application, the bottom bracket tube of the bicycle frame is first placed horizontally on the bottom bracket fixing workpiece 11 on the base 1. This fixes the bottom bracket tube using the bottom bracket fixing workpiece 11, establishing a basic position for the frame during welding. The riser fixing workpiece 12 above the bottom bracket fixing workpiece 11 is used to secure the riser tube to the proper installation position. The upper and lower tubes of the bicycle frame are then placed in the clamping members 23 on the two sliding seats 22 of the adjustment fixture 2. Since the sliding seat 22 can slide between the two support columns 21, the height position of the sliding seat 22 on the support column 21 is first adjusted according to the specific structure of the frame. Since the shaft 231 of the clamping member 23 is rotatably installed in the sliding seat 22, the staff can rotate the shaft 231 to make the upper tube and the down tube fit with the seat tube at a suitable angle. Finally, the movable seat 131 on which the head tube fixing workpiece 13 is installed is horizontally moved along the radial direction of the bottom bracket tube, so that the head tube on the head tube fixing workpiece 13 fits the end of the upper tube and the down tube away from the seat tube, splicing to form the part of the frame except the rear fork. Subsequently, the position of the movable seat 131 is locked by the first locking unit 14, and the position of the sliding seat 22 on the support column 21 is fixed by the second locking unit 24. Finally, the rotation angle of the shaft 231 is locked by the third locking unit 25, thereby realizing precise angle adjustment and fixation between the upper tube and the down tube and the seat tube. The bottom bracket fixing workpiece 11, the seat tube fixing workpiece 12 and the head tube fixing workpiece 13 in this embodiment can all be made of existing technology. The bottom bracket fixing workpiece 11 and the head tube fixing workpiece 13 are usually threaded rods with the same inner diameter as the bottom bracket tube and the head tube. The threaded rods cooperate with threaded fastening rings located at both ends of the bottom bracket tube and the head tube to fix the bottom bracket tube and the head tube. The seat tube fixing workpiece 12 can be a tapered block installed above the bottom bracket fixing workpiece 11. By changing the height position of the tapered block, it is inserted into the upper end of the seat tube, and the seat tube is pressed against the bottom bracket tube to maintain a tight fit. The head tube fixing workpiece 13 in this embodiment is mounted on a movable seat 131 that can move horizontally along the radial direction of the bottom bracket tube, and the sliding seat 22 in the adjustment tool 2 can slide on the support column 21, while the clamping member 23 can rotate around the shaft 231. This allows the tool to flexibly adjust the position and angle of the head tube, top tube, down tube and other components of the frame according to the geometric shapes of different styles of bicycle frames, thereby adapting to the welding requirements of various styles of frames and solving the problem that existing equipment cannot adjust the clamping angle according to the geometry of the frame.

[0037] In order to achieve the purpose of locking the position of the movable seat 131, the following features are specifically set:

[0038] The first locking unit 14 includes two piston cylinders 141 vertically mounted on the movable seat 131. The piston cylinders 141 are filled with hydraulic oil. A bottom column 142 (such as Figure 12As shown in the figure, a first piston rod 143 is coaxially mounted on the top of the piston cylinder 141, and the top of the first piston rod 143 is fixedly connected via a horizontal connecting seat 144, and a linear driver 145 for driving the connecting seat 144 to move along the axis of the piston cylinder 141 is fixedly mounted on the outside of the piston cylinder 141; the two piston cylinders 141 are connected to an oil pipe 147 at a position between the bottom column 142 and the first piston rod 143, and the two oil pipes 147 are respectively connected to the second locking units 24 of the two sliding seats 22.

[0039] In this embodiment, when the position of the movable seat 131 needs to be adjusted, the linear driver 145 drives the first piston rod 143 to move upward, and the bottom column 142 at the bottom of the piston cylinder 141 is not pressurized, so that the movable seat 131 can move horizontally along the radial direction of the five-way pipe on the base 1. After the movable seat 131 moves to the appropriate position, the linear driver 145 drives the connecting seat 144 to move downward along the axis of the piston cylinder 141, and the first piston rod 143 moves downward in the piston cylinder 141 accordingly. The downward movement of the first piston rod 143 will cause the hydraulic oil in the piston cylinder 141 to generate pressure on the bottom column 142, and the friction between the bottom column 142 and the surface of the base 1 will increase, thereby locking the movable seat 131 in the current position. The linear driver 145 in this embodiment can be an electric push rod, a pneumatic cylinder, or an oil cylinder. Since the two piston cylinders 141 are located between the bottom column 142 and the first piston rod 143 and are connected by an oil pipe 147, when the bottom column 142 is in contact with the surface of the base 1, the bottom column 142 cannot move further. As the first piston rod 143 moves downward, the hydraulic oil transmits the pressure to the second locking unit 24 through the oil pipe 147. The second locking unit 24 uses the pressure transmitted by the hydraulic oil to lock the position of the sliding seat 22 on the support column 21. The first locking unit 14 is connected to the second locking units 24 of the two sliding seats 22 through the oil pipe 147, thereby realizing the linkage of the position locking of the moving seat 131 and the sliding seat 22. While locking the position of the moving seat 131, the position of the sliding seat 22 can be locked synchronously, which reduces the operation steps and improves work efficiency.

[0040] In order to solve the problem of how to switch between the sliding state and the locked state of the sliding seat 22 on the support column 21, the following features are specifically set:

[0041] The cross section of the support column 21 is rectangular, and the sliding seat 22 is provided with a limiting groove 221 on both sides (combined with Figure 5 and Figure 6 ), the sliding seat 22 is slidably installed between the supporting columns 21 through the limiting groove 221, and a through hole 223 is provided on one side of the limiting groove 221 (such as Figure 4 As shown), the second locking unit 24 includes a locking block 241 slidably mounted in the sliding seat 22 and flush with the through hole 223. When the locking block 241 is in contact with the support column 21, the position of the sliding seat 22 on the support column 21 is locked.

[0042] In this embodiment, when the position of the sliding seat 22 on the support column 21 needs to be adjusted, since the cross-section of the support column 21 is rectangular, the sliding seat 22 can slide freely between the support columns 21 through the limiting grooves 221 on both sides. The limiting grooves 221 limit and guide the sliding seat 22, so that it can only move along the direction of the support column 21. At this time, the locking block 241 is in an unlocked state and will not hinder the sliding of the sliding seat 22. After the sliding seat 22 moves to the appropriate position, the locking block 241 slides in the through hole 223 and fits the support column 21, thereby generating friction, and tightly locking the sliding seat 22 at the current position on the support column 21, thereby locking the position of the sliding seat 22 on the support column 21, and ensuring that the sliding seat 22 will not be displaced during the welding process. This embodiment utilizes a support column 21 with a rectangular cross section in conjunction with a sliding seat 22 with a limiting groove 221, and a hydraulically driven locking block 241, which can stably achieve switching between the sliding and locking states of the sliding seat 22 with high reliability.

[0043] In order to solve the problem of how to use the pressure of the hydraulic oil to lock the locking block 241 to the sliding seat 22, the following features are specifically set:

[0044] The locking block 241 is provided with an inclined surface at one end away from the through hole 223. The second locking unit 24 includes a mounting seat 242 arranged above the locking block 241. A second piston rod 243 extending vertically is slidably installed at the bottom of the mounting seat 242. The mounting seat 242 is provided with an oil channel 244 above the second piston rod 243. The oil pipe 147 is connected to the oil channel 244 on the sliding seat 22. The first piston rod 143 moves downward so that the hydraulic oil enters the mounting seat 242 through the oil pipe 147 to push the second piston rod 243 to move downward. The second piston rod 243 moves downward in contact with the inclined surface of the locking block 241, pushing the locking block 241 through the through hole 223 to fit the support column 21.

[0045] In this embodiment, the downward movement of the first piston rod 143 will cause the hydraulic oil in the piston cylinder 141 to generate pressure. The hydraulic oil is transmitted to the oil channel 244 on the sliding seat 22 through the oil pipe 147. The oil channel 244 is connected to the mounting seat 242, and the hydraulic oil entering the oil channel 244 pushes the second piston rod 243 in the mounting seat 242 to move vertically downward. During the downward movement of the second piston rod 243, its bottom is in contact with the inclined surface of the locking block 241 away from the through hole 223. Due to the action of the inclined surface, the vertical downward movement of the second piston rod 243 is converted into horizontal movement of the locking block 241, pushing the locking block 241 through the through hole 223, and finally making the locking block 241 in contact with the support column 21. As the locking block 241 is in close contact with the support column 21, friction is generated, thereby locking the sliding seat 22 in its current position on the support column 21. In this embodiment, the hydraulic oil pressure from the first locking unit 14 is transmitted to the second locking unit 24 via the oil pipe 147, achieving a coordinated locking of the movable seat 131 and the sliding seat 22. The inclined surface of the locking block 241 converts the vertical downward movement of the second piston rod 243 into horizontal movement of the locking block 241. The friction generated by the contact between the locking block 241 and the support column 21 provides a reliable locking force, ensuring that the sliding seat 22 does not move during the bicycle frame welding process. This helps to ensure the docking accuracy of the frame components and improve the welding quality.

[0046] In order to achieve the purpose of automatically resetting the locking block 241 and the second piston rod 243 when the first piston rod 143 moves upward, the following features are specifically provided:

[0047] The inner wall of the sliding seat 22 and the locking block 241 are elastically connected by a first spring 245. The elastic force of the first spring 245 causes the locking block 241 to move to the side away from the through hole 223. A limit block is provided in the sliding seat 22 to limit the movement position of the locking block 241; a second spring 246 is provided in the mounting seat 242, and the second spring 246 is elastically connected to the second piston rod 243. The elastic force of the second spring 246 causes the second piston rod 243 to move upward.

[0048] In this embodiment, the locking block 241 may be provided with several guide rods, which are inserted into guide sleeves provided on the inner wall of the sliding seat 22 to stabilize the movement path of the locking block 241. When the first piston rod 143 moves upward and the hydraulic oil pressure in the piston cylinder 141 decreases, the first spring 245, which is sleeved on the guide rods and in a compressed state, will push the locking block 241 away from the through hole 223 due to its elastic force, separating the locking block 241 from the support column 21, unlocking the sliding seat 22 and restoring the sliding state. At the same time, the second spring 246, which is in a compressed state, will also push the second piston rod 243 upward due to its elastic force, returning it to its initial position and preparing for the next locking. The limit block limits the movement of the locking block 241 throughout the process, ensuring that its inclined surface is always located below the second piston rod 243.

[0049] In order to ensure the locking effect of the locking block 241 on the sliding seat 22, the following features are specifically set:

[0050] A friction pattern is provided on a side of the support column 21 facing the through hole 223 , and a friction pattern is provided on a side of the locking block 241 facing the support column 21 .

[0051] The friction pattern in this embodiment significantly increases the friction between the locking block 241 and the support column 21. During the welding process, the frame is subject to various external forces. The greater friction can effectively resist these external forces and prevent the sliding seat 22 from moving, thereby ensuring the relative position accuracy of the various frame components during welding and improving the welding quality.

[0052] In order to reduce the difficulty of the sliding seat 22 moving along the support column 21 due to the friction lines, the following features are specifically provided:

[0053] The width of the limiting groove 221 is greater than that of the supporting column 21 . Balls 222 are rotatably mounted at both ends of the limiting groove 221 . The balls 222 protrude from the surface of the limiting groove 221 and contact the outer wall of the supporting column 21 .

[0054] In this embodiment, when the position of the sliding seat 22 on the support column 21 needs to be adjusted, because the width of the limiting groove 221 is greater than the width of the support column 21, and balls 222 are rotatably mounted at both ends of the limiting groove 221, protruding from the surface and contacting the outer wall of the support column 21, the sliding seat 22 and the support column 21 are not in surface contact, but rather in rolling contact via the balls 222. When the sliding seat 22 is pushed, the balls 222 roll on the outer wall of the support column 21, greatly reducing the friction force during the movement of the sliding seat 22. Even if the support column 21 is provided with friction grooves, it will not significantly hinder the movement of the sliding seat 22, allowing the sliding seat 22 to move to the appropriate position on the support column 21 relatively easily.

[0055] In order to achieve the purpose of locking the rotation angle of the clamping member 23 by utilizing the oil pressure of the hydraulic oil, the following features are specifically provided:

[0056] A guide sleeve 225 is provided in the sliding seat 22, and a shaft 231 is inserted into the guide sleeve 225. A friction ring 232 is coaxially provided on the shaft 231. The third locking unit 25 includes two clamping plates 251 slidably installed in the sliding seat 22. The clamping plates 251 are provided with a "V"-shaped opening. The two clamping plates 251 are staggered along the axis direction of the shaft 231. The clamping plates 251 are respectively provided on both sides of the friction ring 232 to make contact with the axis of the friction ring 232. Symmetrical synchronous movement; a vertically extending pressure relief chamber 247 is provided on one side of the mounting seat 242, and the pressure relief chamber 247 is connected to the oil channel 244 through a pressure relief oil channel 248, and a pressure relief valve core 249 for blocking the pressure relief oil channel 248 is coaxially provided in the pressure relief chamber 247; a third piston rod 252 extending vertically upward is provided on the clamping plate 251 located above, and the third piston rod 252 is inserted in the pressure relief chamber 247 and coaxially connected to the pressure relief valve core 249.

[0057] In this embodiment, the second piston rod 243 moves downward, causing the locking block 241 to pass through the through hole 223 and abut against the support column 21. After the sliding seat 22 is locked in position on the support column 21, the first piston rod 143 continues to move downward. As the oil pressure in the oil passage 244 continues to increase, when the oil pressure reaches a certain value, the oil pressure acts on the pressure relief valve core 249, overcoming its blocking force and allowing hydraulic oil to enter the pressure relief chamber 247 through the pressure relief oil passage 248. The hydraulic oil entering the pressure relief chamber 247 pushes the pressure relief valve core 249 and the third piston rod 252 connected to the pressure relief valve core 249 downward. The third piston rod 252 is connected to the clamping plate 251 located above. The downward movement of the third piston rod 252 drives the clamping plate 251 downward. Because the two clamping plates 251 are staggered along the axis of the shaft 231 and move synchronously and symmetrically about the axis of the friction ring 232, the movement of the upper clamping plate 251 drives the lower clamping plate 251 to move upward, and the "V"-shaped openings on the two clamping plates 251 gradually clamp the friction ring 232. As the clamping force increases, the rotation of the shaft 231 is restricted, thereby locking the rotation angle of the clamping member 23. This embodiment achieves the linkage between the position locking of the sliding seat 22 and the rotation angle locking of the clamping member 23 through the transmission of hydraulic oil pressure. When the position of the sliding seat 22 is adjusted, the rotation angle of the clamping member 23 can be automatically locked without the need for additional operating steps, thereby improving the efficiency of the tooling and reducing operation time.

[0058] In order to achieve the purpose of synchronously moving the two clamping plates 251 in symmetric relation to the axis of the shaft 231 in opposite directions, the following features are specifically provided:

[0059] The two ends of the clamping plate 251 are slidably mounted on the first slide rail 226 set in the sliding seat 22. The two ends of the clamping plate 251 are provided with horizontally extending connecting columns 253. The connecting columns 253 extend to the outside of the sliding seat 22 through the vertically extending waist-shaped holes 227 set on the first slide rail 226, and are connected to the rack 254 slidably mounted on the outside of the sliding seat 22. The two racks 254 at the same end of the two clamping plates 251 are vertically arranged and meshed with the center gear 228 rotatably mounted on the outside of the sliding seat 22; the axis of the center gear 228 is horizontally arranged and perpendicular to the axis of the shaft 231.

[0060] In this embodiment, the third piston rod 252 drives the upper clamping plate 251 downward. Because the connecting posts 253 at each end of the clamping plate 251 extend through the waist-shaped holes 227 on the first slide rail 226 and connect to the rack 254, the downward movement of the upper clamping plate 251 drives the connected rack 254 downward. This rack 254 engages with the center gear 228, driving the center gear 228 to rotate. Because both racks 254 at the same end of the two clamping plates 251 engage with the center gear 228, the rotation of the center gear 228 causes the other rack 254 to move upward, thereby driving the lower clamping plate 251 upward. Ultimately, the two clamping plates 251 move synchronously in opposite directions, symmetrically about the axis of the shaft 231. The "V"-shaped openings on these plates gradually clamp the friction ring 232, locking the shaft 231 and thereby locking the rotation angle of the clamping member 23. This embodiment, through the meshing transmission of the rack 254 and the central gear 228, precisely achieves synchronous, symmetrical, and opposite movement of the two clamping plates 251 about the axis of the shaft 231. This precise movement ensures that the two clamping plates 251 apply a uniform clamping force to the friction ring 232, resulting in a balanced locking force on the shaft 231. This prevents the shaft 231 from tilting or rotating due to uneven force, thereby improving the accuracy of locking the rotation angle of the clamping member 23.

[0061] In order to achieve the purpose of automatically returning the clamping plate 251 to release the locking of the rotation angle of the clamping member 23 after the first piston rod 143 moves upward, the following features are specifically provided:

[0062] A guide rod 255 extending vertically upward is provided on the top of the clamping plate 251 located on the upper side. The guide rod 255 is inserted into the sliding seat 22 and extends to the outside of the sliding seat 22. A limit head 256 is coaxially provided on the top of the guide rod 255. A third spring 257 is sleeved on the guide rod 255. The third spring 257 elastically connects the outside of the sliding seat 22 and the limit head 256. The elastic force of the third spring 257 causes the clamping plate 251 to move upward.

[0063] In this embodiment, the linear actuator 145 moves the first piston rod 143 upward, reducing the hydraulic oil pressure within the piston cylinder 141. The oil pressure within the oil passage 244 and the pressure relief chamber 247 also decreases, reducing the hydraulic thrust acting on the third piston rod 252. At this point, the compressed third spring 257, due to its own elastic force, pushes the stopper 256 upward, which in turn drives the clamping plate 251 upward. Due to the synchronous, opposing movements of the two clamping plates 251, the lower clamping plate 251 moves downward, separating the two clamping plates 251 and releasing the grip on the friction ring 232. The shaft 231 returns to a free-rotating state, effectively releasing the rotational angle lock on the clamping member 23. Simultaneously, the third piston rod 252 on the clamping plate 251 drives the pressure relief valve core 249 upward, restoring its sealing effect on the pressure relief oil passage 248 and discharging the hydraulic oil previously in the pressure relief chamber 247, ensuring that subsequent operations can proceed.

[0064] Working Principle: First, the bicycle frame's bottom bracket is horizontally placed on the bottom bracket fixture 11 on the base 1. This secures the bottom bracket, establishing a basic position for frame welding. The riser fixture 12, located above the bottom bracket fixture 11, secures the riser to the proper installation position. The top and bottom brackets of the bicycle frame are then placed in the clamps 23 on the two sliding seats 22 of the adjustment fixture 2. Since the sliding seat 22 can slide between the two support columns 21, the height position of the sliding seat 22 on the support column 21 is first adjusted according to the specific structure of the frame. Since the shaft 231 of the clamping member 23 is rotatably installed in the sliding seat 22, the staff can rotate the shaft 231 to make the upper and lower tubes fit with the seat tube at a suitable angle. Finally, the movable seat 131 on which the head tube fixing workpiece 13 is installed is horizontally moved along the radial direction of the bottom bracket tube, so that the head tube on the head tube fixing workpiece 13 fits the end of the upper and lower tubes away from the seat tube, splicing to form the part of the frame except the rear fork. Then, the linear actuator 145 of the first locking unit 14 is activated, and the first piston rod 143 moves downward to increase the pressure of the hydraulic oil. The pressure is transmitted through the oil pipe 147 to lock the position of the movable seat 131. The oil pressure is transmitted to the second locking unit 24 to fix the position of the sliding seat 22 on the support column 21. Finally, the oil pressure is transmitted to the third locking unit 25 to lock the rotation angle of the shaft 231, thereby achieving precise angular adjustment and fixation between the upper and lower tubes and the seat tube.

[0065] The above embodiments merely represent one or several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An angle-adjustable bicycle frame welding fixture, comprising a base, a five-way fixing workpiece for horizontally fixing the five-way tube is provided on the base, and a riser fixing workpiece is provided above the five-way fixing workpiece, characterized in that: A head tube fixing workpiece is provided on one side of the bottom bracket fixing workpiece. The head tube fixing workpiece is mounted on a movable seat. The movable seat is slidably mounted on the base and moves horizontally along the radial direction of the bottom bracket. The movable seat is provided with a first locking unit for locking the position of the movable seat. The base is provided with an adjustment tooling between the bottom bracket fixing workpiece and the head tube fixing workpiece, the adjustment tooling comprises two vertically arranged support columns, two sliding seats are slidably installed between the support columns, each sliding seat is provided with a clamping piece for clamping the upper tube and the lower tube, a horizontal shaft is provided at one end of the clamping piece facing the sliding seat, the axis of the shaft is parallel to the bottom bracket tube fixed by the bottom bracket fixing workpiece, the shaft is rotatably installed in the sliding seat, and a second locking unit for fixing the position of the sliding seat on the support column and a third locking unit for locking the rotation angle of the shaft; The first locking unit includes two piston cylinders vertically mounted on a movable seat, the piston cylinders are filled with hydraulic oil, a bottom column is coaxially mounted on the bottom of the piston cylinder, a first piston rod is coaxially mounted on the top of the piston cylinder, the top of the first piston rod is fixedly connected via a horizontal connecting seat, and a linear actuator for driving the connecting seat to move along the axis of the piston cylinder is fixedly mounted on the outside of the piston cylinder; The two piston cylinders are located between the bottom column and the first piston rod and are connected to oil pipes, which are respectively connected to the second locking units of the two sliding seats; The cross section of the support column is rectangular, and limiting grooves are provided on both sides of the sliding seat. The sliding seat is slidably installed between the support columns through the limiting grooves. A through hole is provided on one side of the limiting groove. The second locking unit includes a locking block slidably installed in the sliding seat and flush with the through hole. When the locking block is in contact with the support column, the position of the sliding seat on the support column is locked; The locking block is provided with an inclined surface at one end away from the through hole, and the second locking unit includes a mounting seat arranged above the locking block, and a second piston rod extending vertically is slidably mounted on the bottom of the mounting seat. The mounting seat is provided with an oil channel above the second piston rod, and the oil pipe is connected to the oil channel on the sliding seat. When the first piston rod moves downward, the hydraulic oil enters the mounting seat through the oil pipe and pushes the second piston rod downward. The second piston rod moves downward in contact with the inclined surface of the locking block, pushing the locking block through the through hole to fit the support column; A guide sleeve is provided in the sliding seat, and a shaft is inserted into the guide sleeve. A friction ring is coaxially provided on the shaft. The third locking unit includes two clamping plates slidably installed in the sliding seat. The clamping plates are provided with "V"-shaped openings. The two clamping plates are staggered along the axis of the shaft. The clamping plates are respectively provided on both sides of the friction ring and move synchronously symmetrically about the axis of the friction ring. A vertically extending pressure relief chamber is provided on one side of the mounting seat, the pressure relief chamber is connected to the oil channel via a pressure relief oil channel, and a pressure relief valve core is coaxially provided in the pressure relief chamber for blocking the pressure relief oil channel; A third piston rod extending vertically upward is provided on the upper clamping plate. The third piston rod is inserted into the pressure relief chamber and is coaxially connected to the pressure relief valve core.

2. The angle-adjustable bicycle frame welding fixture according to claim 1, characterized in that: The inner wall of the sliding seat and the locking block are elastically connected via a first spring, and the elastic force of the first spring causes the locking block to move to a side away from the through hole. A limit block is provided in the sliding seat to limit the movement position of the locking block; A second spring is arranged in the mounting seat, and the second spring is elastically connected to the second piston rod. The elastic force of the second spring causes the second piston rod to move upward.

3. The angle-adjustable bicycle frame welding fixture according to claim 2, characterized in that: The side of the support column facing the through hole is provided with a friction pattern, and the side of the locking block facing the support column is provided with a friction pattern.

4. The angle-adjustable bicycle frame welding fixture according to claim 3, characterized in that: The width of the limiting groove is greater than the width of the supporting column. Balls are rotatably installed at both ends of the width of the limiting groove. The balls protrude from the surface of the limiting groove and contact the outer wall of the supporting column.

5. The angle-adjustable bicycle frame welding fixture according to claim 4, characterized in that: The two ends of the clamping plate are slidably mounted on the first slide rails provided in the sliding seat, and the two ends of the clamping plate are provided with horizontally extending connecting columns, which extend to the outside of the sliding seat through the vertically extending waist-shaped holes provided on the first slide rails and are connected to the racks slidably mounted on the outside of the sliding seat. The two racks at the same end of the two clamping plates are vertically arranged and meshed with the central gear rotatably mounted on the outside of the sliding seat; The axis of the central gear is arranged horizontally and perpendicular to the axis of the shaft.

6. The angle-adjustable bicycle frame welding fixture according to claim 5, characterized in that: A guide rod extending vertically upward is provided on the top of the clamping plate located on the upper side. The guide rod is inserted into the sliding seat and extends to the outside of the sliding seat. A limit head is coaxially provided on the top of the guide rod. A third spring is sleeved on the guide rod. The third spring elastically connects the outside of the sliding seat and the limit head. The elastic force of the third spring causes the clamping plate to move upward.

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