Angle-adjustable bicycle frame welding and fixing tool

Abstract

The invention relates to the field of welding fixing equipment, in particular to an angle-adjustable bicycle frame welding fixing tool which comprises a base, a five-way pipe fixing workpiece, a vertical pipe fixing workpiece, a head pipe fixing workpiece and an adjusting tool, the head pipe fixing workpiece is installed on a movable seat, and the movable seat is installed on the base in a sliding mode and horizontally moves in the radial direction of a five-way pipe; the adjusting tool comprises two supporting stand columns which are vertically arranged and two sliding seats, each sliding seat is provided with a clamping piece, each clamping piece is provided with a horizontal shaft rod, and the shaft rods are rotatably installed in the sliding seats. According to the technical scheme, the sliding seats in the adjusting tool slide on the supporting stand columns, and meanwhile the clamping pieces can rotate around the shaft rods; the tool can flexibly adjust the positions and angles of a head tube, an upper tube, a lower tube and the like of all parts of the bicycle frame according to the geometrical shapes of bicycle frames of different styles, and therefore the welding requirements of the bicycle frames of various styles are met.

Description

Technical Field

[0001] The present invention relates to the field of welding and fixing equipment, and specifically relates to an angle-adjustable welding and fixing tooling for a bicycle frame. Background Art

[0002] At present, bicycles are a convenient means of transportation and are widely loved by people of all ages. During the processing of bicycle frames, in order to ensure their rigid structure, welding technology is required for processing. During the welding process, a fixing device is needed to clamp the main body of the frame for welding and fixing.

[0003] Since the geometries of bicycle frames of different models are different, when welding different models of bicycle frames, the upper tube and the lower tube need to be attached to the vertical tube at different inclination angles. The clamping angle of the fixing tooling for different frames also needs to be changed. Otherwise, the factory needs a large number of fixing toolings of different sizes, which is costly. And after aligning the components of the frame, it is necessary to use clamping parts to lock each component of the frame one by one to ensure the stability of the pipe during welding, and the operation is complex. Summary of the Invention

[0004] In view of the above problems, it is necessary to provide an angle-adjustable welding and fixing tooling for a bicycle frame to solve the problems of the prior art.

[0005] To solve the problems of the prior art, the technical solution adopted by the present invention is as follows:

[0006] An angle-adjustable welding and fixing tooling for a bicycle frame, including a base. A bottom bracket fixing workpiece for horizontally fixing the bottom bracket tube is arranged on the base. A vertical tube fixing workpiece is arranged above the bottom bracket fixing workpiece. A head tube fixing workpiece is arranged on one side of the bottom bracket fixing workpiece. The head tube fixing workpiece is installed on a moving seat. The moving seat is slidably installed on the base and horizontally moves along the radial direction of the bottom bracket tube. A first locking unit for locking the position of the moving seat is arranged on the moving seat. An adjusting tooling is arranged between the base at the positions of the bottom bracket fixing workpiece and the head tube fixing workpiece. The adjusting tooling includes two vertically arranged support columns. Two sliding seats are slidably installed between the support columns. A clamping part for clamping the upper tube and the lower tube is arranged on each sliding seat. One end of the clamping part facing the sliding seat is provided with a horizontal shaft rod. The axis of the shaft rod is parallel to the bottom bracket tube fixed by the bottom bracket fixing workpiece. The shaft rod is rotatably installed in the sliding seat. 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 rod are arranged in the sliding seat.

[0007] Preferably, the first locking unit includes two piston cylinders vertically installed on the moving seat. The piston cylinders are filled with hydraulic oil. A bottom column is coaxially installed at the bottom of the piston cylinder, and a first piston rod is coaxially installed at the top of the piston cylinder. The top of the first piston rod is fixedly connected through a horizontal connecting seat. A linear actuator for driving the connecting seat to move along the axis of the piston cylinder is fixedly installed outside the piston cylinder; the two piston cylinders are communicated with an oil pipe at the position between the bottom column and the first piston rod, and the two oil pipes are respectively communicated to the second locking units of the two sliding seats.

[0008] Preferably, the cross-section of the support column is rectangular. 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 fits against the support column, the position of the sliding seat on the support column is locked.

[0009] Preferably, an inclined slope is provided at one end of the locking block away from the through hole. The second locking unit includes a mounting seat provided above the locking block. A second piston rod extending vertically is slidably installed at the bottom of the mounting seat. An oil passage is provided above the mounting seat at the second piston rod. The oil pipe is communicated to the oil passage on the sliding seat. When the first piston rod moves downward, the hydraulic oil enters the mounting seat through the oil pipe to push the second piston rod downward. The second piston rod moves downward along the slope of the locking block to push the locking block through the through hole to fit against the support column.

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

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

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

[0013] Preferably, a guide sleeve is arranged inside the sliding seat, the shaft rod is inserted on the guide sleeve, a friction ring is coaxially arranged on the shaft rod, the third locking unit includes two clamping plates slidably installed inside the sliding seat, a "V"-shaped opening is arranged on the clamping plate, the two clamping plates are arranged staggeredly along the axial direction of the shaft rod, and the clamping plates are respectively arranged on both sides of the friction ring and move synchronously symmetrically about the axis of the friction ring; a pressure relief cavity extending vertically is arranged on one side of the mounting seat, the pressure relief cavity is communicated with the oil passage through a pressure relief oil passage, and a pressure relief valve core for blocking the pressure relief oil passage is coaxially arranged inside the pressure relief cavity; a third piston rod extending vertically upward is arranged on the upper clamping plate, and the third piston rod is inserted into the pressure relief cavity and coaxially connected with the pressure relief valve core.

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

[0015] Preferably, a guide rod extending vertically upward is arranged at the top of the upper clamping plate, the guide rod is inserted into the sliding seat and extends to the outside of the sliding seat, a limit head is coaxially arranged at the top end 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, and the elastic force of the third spring makes the clamping plate move upward.

[0016] The beneficial effects of the present invention compared with the prior art are as follows:

[0017] First, the head tube fixing workpiece in the present invention is installed on the moving seat that can move horizontally along the radial direction of the bottom bracket tube, and the sliding seat in the adjusting tooling can slide on the support column, and at the same time, the clamping member can rotate around the shaft rod, so that the tooling can flexibly adjust the positions and angles of the head tube, the upper tube, the lower tube and other components of the frame according to the geometric shapes of different styles of bicycle frames, so as to adapt to the welding requirements of various styles of frames, and solve the problem that the existing equipment cannot adjust the clamping angle according to the frame geometry.

[0018] Second, in the present invention, the action of driving the first piston rod to move downward by the linear driver increases the oil pressure in the piston cylinder, so as to lock the position of the moving seat. The oil pressure is transmitted through the oil pipe to realize the locking of the position of the clamping member by the second locking unit and the locking of the rotation angle of the clamping member by the third locking unit, ensuring the stability of each component of the frame during welding.

[0019] Thirdly, through the meshing transmission between the rack and the central gear, the present invention can accurately achieve the synchronous reverse movement of the two clamping plates symmetrically with respect to the axis of the shaft rod. This precise movement mode can ensure that the two clamping plates apply a uniform clamping force to the friction ring, making the locking force received by the shaft rod balanced, and avoiding the shaft rod from tilting or rotating due to uneven force, thereby improving the accuracy of locking the rotation angle of the clamping member. Description of the Drawings

[0020] Figure 1 is a three-dimensional view of an angle-adjustable bicycle frame welding and fixing tooling in an unlocked state Figure 1 ;

[0021] Figure 2 is a three-dimensional view of an angle-adjustable bicycle frame welding and fixing tooling in an unlocked state Figure 2 ;

[0022] Figure 3 is Figure 2 exploded three-dimensional structure diagram of;

[0023] Figure 4 is Figure 3 partial enlarged view at A of;

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

[0025] Figure 6 is Figure 5 partial enlarged view at B of;

[0026] Figure 7 is Figure 5 sectional view taken along line C-C of;

[0027] Figure 8 is Figure 7 partial enlarged view at D of;

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

[0029] Figure 10 is Figure 9 sectional view taken along line E-E of;

[0030] Figure 11 is Figure 10 partial enlarged view at F of;

[0031] Figure 12 is Figure 9 sectional view taken along line G-G of.

[0032] The reference numerals in the figure are: 1, base; 11, five-way fixed workpiece; 12, riser fixed workpiece; 13, head tube fixed 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 tooling; 21, support column; 22, sliding seat; 221, limiting groove; 222, ball; 223, through hole; 225, guide sleeve; 226, first slide rail; 227, kidney-shaped hole; 228, central gear; 23, clamping piece; 231, shaft rod; 232, friction ring; 24, second locking unit; 241, locking block; 242, mounting seat; 243, second piston rod; 244, oil passage; 245, first spring; 246, second spring; 247, pressure relief chamber; 248, pressure relief oil passage; 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, limiting head; 257, third spring. Detailed implementation manner

[0033] To further understand the features, technical means, specific purposes, and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0034] Refer to Figures 1 to 12 :

[0035] An angle-adjustable bicycle frame welding and fixing tooling, including a base 1, on which a five-way fixed workpiece 11 for horizontally fixing a five-way pipe is provided. Above the five-way fixed workpiece 11, a riser fixed workpiece 12 is provided. On one side of the five-way fixed workpiece 11, a head tube fixed workpiece 13 is provided. The head tube fixed workpiece 13 is installed on a moving seat 131, and the moving seat 131 is slidably installed on the base 1 and horizontally moves along the radial direction of the five-way pipe. A first locking unit 14 for locking the position of the moving seat 131 is provided on the moving seat 131. Between the five-way fixed workpiece 11 and the head tube fixed workpiece 13 on the base 1, an adjustment tooling 2 is provided. The adjustment tooling 2 includes two vertically arranged support columns 21. Two sliding seats 22 are slidably installed between the support columns 21. On each sliding seat 22, a clamping piece 23 for clamping an upper tube and a lower tube is provided. One end of the clamping piece 23 facing the sliding seat 22 is provided with a horizontal shaft rod 231. The axis of the shaft rod 231 is parallel to the five-way pipe fixed by the five-way fixed workpiece 11. The shaft rod 231 is rotatably installed in the sliding seat 22. In the sliding seat 22, 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 are provided.

[0036] When this application is in use, first, the bottom bracket tube of the bicycle frame is horizontally placed on the bottom bracket fixing workpiece 11 on the base 1, and the bottom bracket tube is fixed by the bottom bracket fixing workpiece 11, determining a basic position during the welding of the frame. The seat tube fixing workpiece 12 above the bottom bracket fixing workpiece 11 is used to fix the seat tube, making the seat tube in a suitable installation position. The top tube and the down tube of the bicycle frame are respectively placed in the clamping members 23 on the two sliding seats 22 of the adjusting tooling 2. Since the sliding seat 22 can slide between the two support columns 21, first, according to the specific structure of the frame, the height position of the sliding seat 22 on the support columns 21 is adjusted. Since the shaft rod 231 of the clamping member 23 is rotatably installed in the sliding seat 22, the staff can rotate the shaft rod 231 to make the top tube and the down tube fit the seat tube at a suitable angle. Finally, the moving seat 131 with the head tube fixing workpiece 13 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 ends of the top 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 moving seat 131 is locked by the first locking unit 14, the position of the sliding seat 22 on the support columns 21 is fixed by the second locking unit 24, and finally the rotation angle of the shaft rod 231 is locked by the third locking unit 25, thereby realizing the precise angle adjustment and fixation between the top tube, 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 of the prior art. 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 the thread tightening rings 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 presses the seat tube against the bottom bracket tube to keep it in close fit. The head tube fixing workpiece 13 in this embodiment is installed on the moving seat 131 that can horizontally move along the radial direction of the bottom bracket tube, and the sliding seat 22 in the adjusting tooling 2 can slide on the support columns 21, and at the same time the clamping member 23 can rotate around the shaft rod 231, enabling this tooling to flexibly adjust the positions and angles of the frame components such as the head tube, the top tube, and the down tube according to the geometric shapes of different styles of bicycle frames, thus 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 frame geometry.

[0037] For the purpose of locking the position of the moving seat 131, the following features are specifically set:

[0038] The first locking unit 14 includes two piston cylinders 141 vertically installed on the moving seat 131. The piston cylinders 141 are filled with hydraulic oil, and a bottom column 142 is coaxially installed at the bottom of the piston cylinder 141 (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 base 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. When the movable seat 131 moves to a suitable 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 causes 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 increases, 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, an oil cylinder, etc. 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 attached to 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 supporting 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, so that the linkage of the position locking of the moving seat 131 and the sliding seat 22 is realized. 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 the 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 supporting column 21, the following features are specifically set:

[0041] The cross section of the support column 21 is rectangular, and the two sides of the sliding seat 22 are provided with limiting grooves 221 (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 (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 supporting column 21, the position of the sliding seat 22 on the supporting column 21 is locked.

[0042] In this embodiment, when it is necessary to adjust the position of the sliding seat 22 on the support column 21, since the cross-section of the support column 21 is rectangular, the sliding seat 22 can freely slide between the support columns 21 through the limiting grooves 221 on both sides. The limiting grooves 221 play a role in limiting and guiding the sliding seat 22, enabling it to move only along the direction of the support column 21. At this time, the locking block 241 is in an unlocked state and does 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 against the support column 21, thereby generating frictional force to firmly lock the sliding seat 22 at the current position on the support column 21, realizing the locking of the position of the sliding seat 22 on the support column 21 and ensuring that the sliding seat 22 does not displace during the welding process. This embodiment utilizes the cooperation of the support column 21 with a rectangular cross-section and the sliding seat 22 with limiting grooves 221, as well as the hydraulically driven locking block 241, to stably achieve the switching between the sliding and locking states of the sliding seat 22, with high reliability.

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

[0044] One end of the locking block 241 away from the through hole 223 is provided with an inclined slope. The second locking unit 24 includes a mounting seat 242 arranged above the locking block 241. A vertically extending second piston rod 243 is slidably mounted at the bottom of the mounting seat 242. An oil passage 244 is provided above the mounting seat 242 at the second piston rod 243. The oil pipe 147 is connected to the oil passage 244 on the sliding seat 22. When the first piston rod 143 moves downward, the hydraulic oil enters the mounting seat 242 through the oil pipe 147 to push the second piston rod 243 downward. The second piston rod 243 moves downward while fitting against the slope of the locking block 241 to push the locking block 241 through the through hole 223 to fit against the support column 21.

[0045] In this embodiment, the downward movement of the first piston rod 143 causes the hydraulic oil in the piston cylinder 141 to generate pressure. The hydraulic oil is transmitted through the oil pipe 147 to the oil passage 244 on the sliding seat 22. The oil passage 244 communicates with the mounting seat 242, and the hydraulic oil entering the oil passage 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, the bottom thereof abuts against the inclined surface at one end of the locking block 241 away from the through hole 223. Due to the effect of the inclined surface, the vertical downward movement of the second piston rod 243 is converted into the horizontal movement of the locking block 241, pushing the locking block 241 through the through hole 223, and finally making the locking block 241 abut against the support column 21. As the locking block 241 is in close contact with the support column 21, frictional force is generated, thereby locking the sliding seat 22 at the current position on the support column 21. In this embodiment, the hydraulic oil pressure of the first locking unit 14 is transmitted to the second locking unit 24 through the oil pipe 147, realizing the linkage of the locking of the moving 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 the horizontal movement of the locking block 241. The frictional force generated by the contact between the locking block 241 and the support column 21 can provide a reliable locking force, ensuring that the sliding seat 22 does not displace during the welding process of the bicycle frame. 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 set:

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

[0048] In this embodiment, a plurality of guide rods can be provided on the locking block 241. The movement path of the locking block 241 is stabilized by inserting the guide rods into the guide sleeves provided on the inner wall of the sliding seat 22. When the first piston rod 143 moves upward and the hydraulic oil pressure in the piston cylinder 141 decreases. At this time, the first spring 245 sleeved on the guide rod and in a compressed state will, due to the elastic force, push the locking block 241 to move toward the side away from the through hole 223, causing the locking block 241 to separate from the support column 21, unlocking the sliding seat 22 and restoring its slidable state. At the same time, the second spring 246 in the compressed state will also, due to the elastic force, push the second piston rod 243 upward to return it to its initial position, preparing for the next locking. The limiting block limits the movement position of the locking block 241 throughout the process to ensure that its inclined surface is always 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] Friction lines are provided on one side of the support column 21 facing the through hole 223, and friction lines are provided on one side of the locking block 241 facing the support column 21.

[0051] In this embodiment, the setting of the friction lines significantly increases the friction force between the locking block 241 and the support column 21. During the welding process, the frame will be subjected to various external forces, and the relatively large friction force can effectively resist these external forces, preventing the sliding seat 22 from displacing, thereby ensuring the relative position accuracy of the 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 set:

[0053] The width of the limiting groove 221 is greater than the width of the support column 21. At both ends of the width of the limiting groove 221, balls 222 are rotatably installed, and the balls 222 protrude from the surface of the limiting groove 221 to contact the outer wall of the support column 21.

[0054] In this embodiment, when it is necessary to adjust the position of the sliding seat 22 on the support column 21, since the width of the limiting groove 221 is greater than the width of the support column 21, and balls 222 that protrude from its surface and contact the outer wall of the support column 21 are rotatably installed at both ends of the limiting groove 221, the sliding seat 22 and the support column 21 are not in surface contact, but rather achieve rolling contact through the balls 222. When the sliding seat 22 is pushed, the balls 222 will roll on the outer wall of the support column 21, greatly reducing the friction force when the sliding seat 22 moves. Even if the support column 21 is provided with friction lines, it will not cause a large obstacle to the movement of the sliding seat 22, enabling the sliding seat 22 to move relatively easily to a suitable position on the support column 21.

[0055] For the purpose of locking the rotation angle of the clamping member 23 by using the oil pressure of the hydraulic oil, the following features are specifically provided:

[0056] A guide sleeve 225 is arranged in the sliding seat 22. The shaft rod 231 is inserted on the guide sleeve 225. A friction ring 232 is coaxially arranged on the shaft rod 231. The third locking unit 25 includes two clamping plates 251 slidably mounted in the sliding seat 22. The clamping plates 251 are provided with "V"-shaped openings. The two clamping plates 251 are arranged staggered along the axial direction of the shaft rod 231. The clamping plates 251 are respectively arranged on both sides of the friction ring 232 and perform synchronous movement symmetric about the axis of the friction ring 232. One side of the mounting seat 242 is provided with a vertically extending pressure relief cavity 247. The pressure relief cavity 247 is communicated with the oil passage 244 through a pressure relief oil passage 248. A pressure relief valve core 249 for blocking the pressure relief oil passage 248 is coaxially arranged in the pressure relief cavity 247. A third piston rod 252 extending vertically upward is arranged on the upper clamping plate 251. The third piston rod 252 is inserted into the pressure relief cavity 247 and is coaxially connected with the pressure relief valve core 249.

[0057] In this embodiment, when the second piston rod 243 moves downward to make the locking block 241 pass through the through hole 223 and fit against the support column 21 to complete the locking of the position of the sliding seat 22 on the support column 21, the first piston rod 143 continues to move downward. As the oil pressure in the oil passage 244 continuously increases, when the oil pressure reaches a certain value, the oil pressure acts on the pressure relief valve core 249, overcoming its blocking force, so that the hydraulic oil enters the pressure relief cavity 247 through the pressure relief oil passage 248. The hydraulic oil entering the pressure relief cavity 247 pushes the pressure relief valve core 249 and the third piston rod 252 connected to the pressure relief valve core 249 to move downward. The third piston rod 252 is connected to the upper clamping plate 251. The downward movement of the third piston rod 252 drives the upper clamping plate 251 to move downward. Since the two clamping plates 251 are arranged staggered along the axial direction of the shaft rod 231 and perform synchronous movement symmetric about the axis of the friction ring 232, the movement of the upper clamping plate 251 will drive 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 rod 231 is restricted, thereby realizing the locking of the rotation angle of the clamping member 23. In this embodiment, through the transmission of the hydraulic oil pressure, the linkage of the position locking of the sliding seat 22 and the rotation angle locking of the clamping member 23 is realized. While adjusting the position of the sliding seat 22, the rotation angle of the clamping member 23 can be automatically locked without additional operation steps, improving the use efficiency of the tooling and reducing the operation time.

[0058] For the purpose of making the two clamping plates 251 perform synchronous reverse movement symmetric about the axis of the shaft rod 231, the following features are specifically provided:

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

[0060] In this embodiment, the third piston rod 252 drives the upper clamping plate 251 to move downward. Since the connecting columns 253 at both ends of the clamping plate 251 pass through the waist-shaped holes 227 on the first slide rail 226 and are connected to the racks 254, the downward movement of the upper clamping plate 251 will drive the connected rack 254 to move downward. This rack 254 meshes with the central gear 228 and will drive the central gear 228 to rotate. Since the two racks 254 at the same end of the two clamping plates 251 are both meshed with the central gear 228, the rotation of the central gear 228 will cause the other rack 254 to move upward, thereby driving the lower clamping plate 251 to move upward. Finally, the two clamping plates 251 perform synchronous reverse movements symmetric about the axis of the shaft rod 231, and the "V"-shaped openings on them gradually clamp the friction ring 232, realizing the locking of the shaft rod 231, and thus locking the rotation angle of the clamping member 23. In this embodiment, through the meshing transmission between the rack 254 and the central gear 228, the two clamping plates 251 can be accurately made to perform synchronous reverse movements symmetric about the axis of the shaft rod 231. This precise movement method can ensure that the two clamping plates 251 apply uniform clamping forces to the friction ring 232, making the locking force received by the shaft rod 231 balanced, and avoiding the shaft rod 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 that the clamping plate 251 can automatically reset 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 set:

[0062] A guide rod 255 extending vertically upward is provided at the top of the upper clamping plate 251. The guide rod 255 is inserted into the slide seat 22 and extends to the outside of the slide seat 22. A limit head 256 is coaxially provided at the top end of the guide rod 255. A third spring 257 is sleeved on the guide rod 255. The third spring 257 is elastically connected between the outside of the slide seat 22 and the limit head 256, and the elastic force of the third spring 257 makes the clamping plate 251 move upward.

[0063] In this embodiment, the linear actuator 145 moves the first piston rod 143 upward, reducing the hydraulic oil pressure inside the piston cylinder 141. The oil pressure in the oil passage 244 and the pressure relief chamber 247 also decreases accordingly, reducing the hydraulic thrust acting on the third piston rod 252. At this time, the third spring 257 in the compressed state will push the limit head 256 upward due to its own elastic force, and the limit head 256 drives the clamping plate 251 upward. Due to the synchronous reverse movement relationship of the two clamping plates 251, the lower clamping plate 251 will move downward, and the two clamping plates 251 separate, releasing the clamping of the friction ring 232, and the shaft rod 231 resumes the free rotation state, realizing the release of the rotation angle locking of the clamping member 23. At the same time, the third piston rod 252 on the clamping plate 251 drives the pressure relief valve core 249 to move upward synchronously. While the pressure relief valve core 249 restores the blocking effect on the pressure relief oil passage 248, it discharges the hydraulic oil that originally entered the pressure relief chamber 247, ensuring the progress of subsequent operations.

[0064] Working principle: First, place the bottom bracket tube of the bicycle frame horizontally on the bottom bracket fixing workpiece 11 on the base 1, and fix the bottom bracket tube through the bottom bracket fixing workpiece 11 to determine a basic position during the frame welding. The seat tube fixing workpiece 12 above the bottom bracket fixing workpiece 11 is used to fix the seat tube and place the seat tube in a suitable installation position. Place the top tube and down tube of the bicycle frame in the clamping member 23 on the two sliding seats 22 of the adjustment tooling 2 respectively. Since the sliding seat 22 can slide between the two support columns 21, first adjust the height position of the sliding seat 22 on the support columns 21 according to the specific structure of the frame. Since the shaft rod 231 of the clamping member 23 is rotatably installed in the sliding seat 22, the operator can rotate the shaft rod 231 to make the top tube and down tube fit the seat tube at a suitable angle. Finally, horizontally move the moving seat 131 equipped with the head tube fixing workpiece 13 along the radial direction of the bottom bracket tube, so that the head tube on the head tube fixing workpiece 13 fits the ends of the top tube and down tube far from the seat tube, splicing to form the part of the frame except the rear fork. Subsequently, start the linear actuator 145 of the first locking unit 14. The first piston rod 143 moves downward to increase the hydraulic oil pressure, and the pressure is transmitted through the oil pipe 147 to lock the position of the moving 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 columns 21. Finally, the oil pressure is transmitted to the third locking unit 25 to lock the rotation angle of the shaft rod 231, thereby realizing the precise angle adjustment and fixation between the top tube and down tube and the seat tube.

[0065] The above embodiments merely represent one or several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to 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 arranged on the base, and a riser fixing workpiece is arranged above the five-way fixing workpiece, characterized in that: A head pipe fixing workpiece is provided on one side of the bottom bracket fixing workpiece, the head pipe fixing workpiece is installed on a moving seat, the moving seat is slidably installed on the base and moves horizontally along the radial direction of the bottom bracket, and a first locking unit for locking the position of the moving seat is provided on the moving seat; The base is located between the five-way fixing workpiece and the head tube fixing workpiece and is provided with an adjustment tool. The adjustment tool includes two vertically arranged support columns, and 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, and a horizontal shaft rod is provided at one end of the clamping piece facing the sliding seat, and the axis of the shaft rod is parallel to the five-way tube fixed by the five-way fixing workpiece. The shaft rod 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 rod are provided in the sliding seat.

2. The angle-adjustable bicycle frame welding fixture according to claim 1, characterized in that: The first locking unit comprises two piston cylinders vertically mounted on the moving 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 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 to 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.

3. The angle-adjustable bicycle frame welding fixture according to claim 2, characterized in that: The cross-section of the supporting column is rectangular, and limiting grooves are arranged on both sides of the sliding seat. The sliding seat is slidably installed between the supporting columns through the limiting grooves. A through hole is arranged 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 supporting column, the position of the sliding seat on the supporting column is locked.

4. The angle-adjustable bicycle frame welding fixture according to claim 3, characterized in that: The locking block is provided with an inclined slope 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 installed at 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 to pass through the through hole and fit the supporting column.

5. The angle-adjustable bicycle frame welding fixture according to claim 4, characterized in that: The inner wall of the sliding seat is elastically connected to the locking block via a first spring, the elastic force of the first spring causes the locking block to move to a side away from the through hole, and a limit block is provided in the sliding seat to limit the moving position of the locking block; A second spring is arranged in the mounting seat, 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.

6. The angle-adjustable bicycle frame welding fixture according to claim 4, characterized in that: 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.

7. The angle-adjustable bicycle frame welding fixture according to claim 6, characterized in that: 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. The balls protrude from the surface of the limiting groove and contact the outer wall of the supporting column.

8. The angle-adjustable bicycle frame welding fixture according to claim 4, characterized in that: A guide sleeve is arranged in the sliding seat, the shaft rod is inserted on the guide sleeve, a friction ring is coaxially arranged on the shaft rod, the third locking unit includes two clamping plates slidably installed in the sliding seat, a "V"-shaped opening is arranged on the clamping plates, 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 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 through the 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; The third piston rod extending vertically upward is arranged on the clamping plate located at the top. The third piston rod is inserted into the pressure relief chamber and is coaxially connected with the pressure relief valve core.

9. The angle-adjustable bicycle frame welding fixture according to claim 8, 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, and 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.

10. The angle-adjustable bicycle frame welding fixture according to claim 8, characterized in that: A guide rod extending vertically upward is arranged 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 arranged 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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