A bicycle frame rear triangle lower fork and lug welding positioning clamping device
By optimizing the design of the welding positioning and clamping device between the rear triangle lower fork and the lugs of the bicycle frame, the problems of welding synchronization and component interference in bicycle frame production have been solved, achieving an efficient production process and high-quality products.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEBEI WELDINGJUE ROBOT TECHNOLOGY CO LTD
- Filing Date
- 2025-07-02
- Publication Date
- 2026-07-03
AI Technical Summary
In current bicycle frame production, the welding of the front triangle and rear triangle components is difficult to be carried out simultaneously, resulting in inconsistent production cycles. Furthermore, the tooling equipment with an integrated structure has many parts and is prone to interference, affecting work efficiency and product quality.
The design includes a welding and positioning clamping device for the rear triangle lower fork and lugs of a bicycle frame. The device comprises a base plate, a front support mechanism for the lower fork tube, a lower fork tube limiting mechanism, a lug positioning mechanism, and a workpiece clamping mechanism. Through optimized design, the device achieves accurate positioning and reliable fixation of the workpiece, adapts to bicycle frames of different sizes, improves work efficiency, and reduces production costs.
This technology enables synchronous welding of the rear triangle components of bicycle frames, improving the consistency of the production cycle, reducing production costs, avoiding component interference, and enhancing work efficiency and product quality.
Smart Images
Figure CN224445100U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bicycle manufacturing technology, specifically to a workpiece positioning and clamping device suitable for welding the rear triangle lower fork and lugs of a bicycle frame. Background Technology
[0002] As attached Figure 1 As shown, a bicycle frame typically consists of a front triangle component 1 and a rear triangle component 2. The rear triangle component 2 includes a top fork assembly 2-1, a bottom fork assembly 2-2, and lugs 2-3. Before welding the bicycle frame, the welding of the top fork assembly 2-1 and the bottom fork assembly 2-2 in both the front triangle component 1 and the rear triangle component 2 is usually completed first (welding the bottom fork assembly 2-2 involves welding the left and right bottom fork tubes to the lugs 2-3). Then, the front triangle component 1 and the rear triangle component 2 are welded together as a single unit. (See attached image.) Figure 2 As shown, the lower fork assembly 2-2 of the rear triangle component 2 of the bicycle frame consists of two lower fork tubes, left and right. The front ends of the two lower fork tubes are provided with curved tube sections 2-2-1 that approach the central axis of the bicycle frame. The rear ends of the two lower fork tubes are welded together with the lugs 2-3. The lugs 2-3 are provided with grooves 2-3-1 that cooperate with the rear wheel axle of the bicycle. According to the relevant process technology requirements, during the welding process of the left and right lower fork tubes and the lugs 3, it is necessary to ensure the perpendicularity of the lugs 2-3 to the plane where the central axis of the lower fork tube is located. Therefore, it is required to accurately position and reliably fix the workpiece.
[0003] In existing technologies, to adapt to orders of different specifications and improve the versatility of tooling equipment, manufacturers design the welding fixtures for the upper fork assembly 2-1 and the lower fork assembly 2-2 as an integrated structure. During use, it is necessary to first complete the batch welding of either the upper fork assembly 2-1 or the lower fork assembly 2-2, and then adjust the welding fixture to perform the welding operation on the other assembly. When order quantities are large and lead times are short, the welding of the upper fork assembly 2-1 and the lower fork assembly 2-2 cannot be carried out simultaneously, making it difficult to ensure the consistency of the entire production cycle. Furthermore, the integrated welding fixture structure also suffers from a large number of parts, and interference problems easily occur during the loading and unloading of workpieces, thus negatively impacting work efficiency. Utility Model Content
[0004] This utility model provides a welding positioning and clamping device for the rear triangle lower fork and lugs of a bicycle frame. It aims to meet the welding process requirements of the workpiece by optimizing the design of the base plate, the front end support mechanism of the lower fork tube, the lower fork tube limiting mechanism, the lug positioning mechanism and the workpiece clamping mechanism. It can also be matched with bicycle frames of different specifications and sizes, thereby improving work efficiency and product quality and reducing production costs.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A welding positioning and clamping device for the rear triangle fork and lugs of a bicycle frame includes a base plate, a fork tube front end support mechanism, a fork tube limiting mechanism, a lug positioning mechanism, and a workpiece clamping mechanism. The base plate is mounted on a rotary table at the welding station. The fork tube front end support mechanism includes a support plate and a support plate mounting seat. The support plate is mounted on one end of the base plate via the support plate mounting seat, and the height of the upper edge of the support plate matches the distance between the bent section of the fork tube and the central axis of the bicycle frame. The fork tube limiting mechanism is provided with several sets of limiting components, each set of limiting components consisting of two limiting blocks on the left and right sides. The lug positioning mechanism includes a positioning seat and a positioning block. The positioning block is mounted on the other end of the base plate via the positioning seat, and the shape and size of the positioning block match the notch on the lug. The workpiece clamping mechanism includes a fork tube clamping component and a lug clamping component, located in the middle of the base plate and at a position corresponding to the lug positioning mechanism, respectively.
[0007] The aforementioned bicycle frame rear triangle lower fork and lug welding positioning clamping device has welding part avoidance holes provided on the base plate. The welding part avoidance holes are located below the joint between the lug and the lower fork tube.
[0008] The aforementioned bicycle frame rear triangle lower fork and lug welding positioning clamping device also has an elongated hole for adjusting the front and rear position of the lower fork tube front end support mechanism on the base plate; the number of the elongated holes for adjusting the front and rear position of the lower fork tube front end support mechanism is not less than two sets, which cooperate with the support plate mounting seat in the lower fork tube front end support mechanism to realize the adjustment of the front and rear position of the support plate in the lower fork tube front end support mechanism.
[0009] The aforementioned bicycle frame rear triangle lower fork and lug welding positioning clamping device also has an elongated hole for adjusting the left and right positions of the lower fork tube limiting mechanism on the base plate; the elongated hole for adjusting the left and right positions of the lower fork tube limiting mechanism matches the number of limiting components in the lower fork tube limiting mechanism, and cooperates with the limiting block in the lower fork tube limiting mechanism to limit the two sides of the lower fork tube.
[0010] The aforementioned bicycle frame rear triangle lower fork and lug welding positioning and clamping device, wherein the support plate mounting seat in the front support mechanism of the lower fork tube is an L-shaped mounting seat, and an elongated hole for adjusting the height of the support plate is provided on its vertical wall; the number of the elongated holes for adjusting the height of the support plate is not less than two sets, which cooperate with the support plate in the front support mechanism of the lower fork tube to realize the adjustment of the height of the support plate.
[0011] The aforementioned bicycle frame rear triangle lower fork and lug welding positioning clamping device, wherein the workpiece clamping mechanism includes a lower fork tube clamping assembly and a lug clamping assembly, both of which are equipped with a lifting seat, a lifting drive element, and a pressing head; the lifting drive element is fixed on the base plate, and a lifting seat is mounted on the lifting drive element; the lifting seat extends to the left and right, and a vertically downward pressing head is installed at its left and right ends.
[0012] The aforementioned bicycle frame rear triangle lower fork and lug welding positioning clamping device, wherein the lifting drive element is a cylinder or a manual caliper.
[0013] The aforementioned bicycle frame rear triangle lower fork and lug welding positioning and clamping device has two sets of lower fork tube limiting mechanisms and lug positioning mechanisms symmetrically arranged on the base plate. It consists of a lower fork tube front end support mechanism, a workpiece pressing mechanism, and two sets of lower fork tube limiting mechanisms and lug positioning mechanisms symmetrically arranged on the left and right to form a workpiece positioning and clamping unit.
[0014] The aforementioned bicycle frame rear triangle lower fork and lug welding positioning and clamping device has two or more workpiece positioning and clamping units arranged on the base plate.
[0015] This utility model provides a welding positioning and clamping device for the rear triangle lower fork and lugs of a bicycle frame. It first positions the lugs using a lug positioning mechanism, then inserts the lug into the rear end of the lower fork tube at its mating point. Next, it uses a lower fork front support mechanism and a lower fork limiting mechanism to position the lower fork tube. Finally, a workpiece clamping mechanism clamps and fixes the lugs and lower fork tube workpiece, thus achieving accurate positioning and reliable fixation of the workpiece. The base plate of this utility model is mounted on a rotary table at the welding station, and welding clearance holes are provided on the base plate. Therefore, after one side of the workpiece is welded, it can be rotated 180 degrees, facilitating robot or manual handling of the workpiece. Welding is performed on the other side. Each workpiece positioning and clamping unit on the base plate can simultaneously complete the welding of two sets of lower fork tubes and lugs in the bicycle frame. The work efficiency can be further improved by setting two upper workpiece positioning and clamping units on the base plate, thereby greatly reducing production costs. The present invention also sets elongated holes for adjusting the front and rear positions of the lower fork tube front end support mechanism and the left and right positions of the lower fork tube limiting mechanism on the base plate. In addition, elongated holes for adjusting the height of the support plate are set on the support plate mounting seat in the lower fork tube front end support mechanism. This allows it to adapt to bicycle frame rear triangle lower fork assemblies of different sizes and specifications, improving the versatility of the present invention. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the bicycle frame structure involved in this utility model;
[0017] Figure 2 yes Figure 1 A schematic diagram of the lower fork assembly structure of the rear triangle component of a bicycle frame;
[0018] Figure 3 This is a schematic diagram of the structure of the first preferred embodiment of the present invention;
[0019] Figure 4 This is a schematic diagram of the working state of the first preferred embodiment of the present invention;
[0020] Figure 5 This is a schematic diagram of the structure and working state of the second preferred embodiment of the present invention;
[0021] Figure 6 yes Figure 5 Top view (after rotation).
[0022] Explanation of each label in the diagram:
[0023] 1 represents the front triangular component;
[0024] 2 is the rear triangle component, 2-1 is the upper fork assembly, 2-2 is the lower fork assembly, 2-2-1 is the curved tube section, 2-3 is the lug, and 2-3-1 is the notch;
[0025] 3 is the base plate, 3-1 is the welding part avoidance hole, 3-2 is the long hole for adjusting the front and rear positions of the lower fork tube front end support mechanism, and 3-3 is the long hole for adjusting the left and right positions of the lower fork tube limiting mechanism.
[0026] 4 is the front end support mechanism of the lower fork tube, 4-1 is the support plate, 4-2 is the support plate mounting seat, and 4-2-1 is the elongated hole for adjusting the height of the support plate.
[0027] 5 is the lower fork tube limiting mechanism;
[0028] 6 is the workpiece clamping mechanism, 6-1 is the lifting drive element, 6-2 is the lifting seat, and 6-3 is the lower pressure head;
[0029] 7 is the ear plate positioning mechanism, 7-1 is the positioning seat, and 7-2 is the positioning block. Detailed Implementation
[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0031] See Figure 1. Figure 2 A bicycle frame typically consists of a front triangle (1) and a rear triangle (2). The rear triangle (2) includes a top fork assembly (2-1), a bottom fork assembly (2-2), and lugs (2-3). Before welding the bicycle frame, the welding of the top fork assembly (2-1) and the bottom fork assembly (2-2) in both the front triangle (1) and rear triangle (2) is usually completed first (welding the bottom fork assembly (2-2) involves welding the left and right bottom fork tubes to the lugs (2-3)). Then, the front triangle (1) and rear triangle (2) are welded together as a single unit. (See attached image.) Figure 2As shown, the lower fork assembly 2-2 of the rear triangle component 2 of the bicycle frame consists of two lower fork tubes, left and right. The front ends of the two lower fork tubes are provided with curved tube sections 2-2-1 that approach the central axis of the bicycle frame. The rear ends of the two lower fork tubes are welded together with the lugs 2-3. The lugs 2-3 are provided with grooves 2-3-1 that cooperate with the rear wheel axle of the bicycle. According to the relevant process technology requirements, during the welding process of the left and right lower fork tubes and the lugs 3, it is necessary to ensure the perpendicularity of the lugs 2-3 to the plane where the central axis of the lower fork tube is located. Therefore, it is required to accurately position and reliably fix the workpiece.
[0032] The following is a reference to the appendix. Figure 3 , Figure 4 The structure of the first preferred embodiment of this utility model will be described in detail.
[0033] See Figure 3 , Figure 4 In its first preferred embodiment:
[0034] The system includes a base plate 3, a lower fork tube front end support mechanism 4, a lower fork tube limiting mechanism 5, an ear plate positioning mechanism 7, and a workpiece clamping mechanism 6. The base plate 3 is mounted on a rotary table at the welding station. The lower fork tube front end support mechanism 4 includes a support plate 4-1 and a support plate mounting seat 4-2. The support plate 4-1 is mounted on one end of the base plate 3 via the support plate mounting seat 4-2. The height of the upper edge of the support plate 4-1 matches the distance between the curved section 2-2-1 of the lower fork tube and the central axis of the bicycle frame. The lower fork tube limiting mechanism 5 is provided with several sets of limiting components, each set of limiting components consisting of two limiting blocks on the left and right sides. The ear plate positioning mechanism 7 includes a positioning seat 7-1 and a positioning block 7-2. The positioning block 7-2 is installed at the other end of the base plate 3 via the positioning seat 7-1. The shape and size of the positioning block 7-2 match the notch 2-3-1 on the ear piece 2-3. The workpiece clamping mechanism 6 includes a lower fork tube clamping assembly and an ear piece clamping assembly, which are located in the middle of the base plate 3 and at the position corresponding to the ear piece positioning mechanism 7, respectively. Both the lower fork tube clamping assembly and the ear piece clamping assembly are provided with a lifting seat 6-2, a lifting drive element 6-1, and a pressing head 6-3. The lifting drive element 6-1 is fixed to a cylinder on the base plate 3. The lifting seat 6-2 is mounted on the cylinder telescopic arm. The lifting seat 6-2 extends to the left and right, and the pressing head 6-3 is installed vertically downward at its left and right ends.
[0035] To accommodate welding operations on bicycle frames of different sizes and specifications, this utility model provides welding clearance holes 3-1, long holes 3-2 for adjusting the front and rear positions of the lower fork tube front end support mechanism, and long holes 3-3 for adjusting the left and right positions of the lower fork tube limiting mechanism on the base plate 3. The support plate mounting base 4-2 in the lower fork tube front end support mechanism 4 is designed as an L-shaped mounting base, with long holes 4-2-1 for adjusting the height of the support plate on the vertical wall of the L-shaped mounting base. The welding clearance holes 3-1 are located below the joint between the lug 2-3 and the lower fork tube. The front and rear positions of the lower fork tube front end support mechanism are... The number of adjusting elongated holes 3-2 is no less than two sets, which cooperate with the support plate mounting seat 4-2 in the lower fork tube front end support mechanism 4 to adjust the front and rear positions of the support plate 4-1 in the lower fork tube front end support mechanism; the number of adjusting elongated holes 3-3 for the left and right positions of the lower fork tube limiting mechanism matches the number of limiting components in the lower fork tube limiting mechanism 5, and cooperates with the limiting block in the lower fork tube limiting mechanism to limit the two sides of the lower fork tube; the number of adjusting elongated holes 4-2-1 for the height of the support plate is no less than two sets, which cooperate with the support plate 4-1 in the lower fork tube front end support mechanism 4 to adjust the height of the support plate.
[0036] In the first preferred embodiment of this utility model, two sets of lower fork tube limiting mechanisms 5 and ear plate positioning mechanisms 7 are symmetrically arranged on the base plate 3. A workpiece positioning and clamping unit is composed of a lower fork tube front end support mechanism 4, a workpiece clamping mechanism 6, and the two sets of lower fork tube limiting mechanisms and ear plate positioning mechanisms arranged symmetrically on the left and right. To further improve work efficiency, two or more workpiece positioning and clamping units can be arranged on the base plate 3.
[0037] The following is a reference to the appendix. Figure 5 , Figure 6 The structure of the second preferred embodiment of this utility model will be described.
[0038] See Figure 5 , Figure 6 The difference between the second preferred embodiment and the first preferred embodiment of this utility model is that the lifting drive element 6-1 in the workpiece clamping mechanism 6 is a manual caliper fixed on the base plate 3. The manual caliper adopts a downward pressing structure and is equipped with a lifting seat 6-2 on its driven arm. The lifting seat 6-2 extends to the left and right, and vertically downward pressing heads 6-3 are installed at its left and right ends.
[0039] Before welding the rear triangle lower fork and lugs of a bicycle frame using this utility model, the front-to-back and height positions of the support plate 4-1 in the front support mechanism of the lower fork tube and the left-to-right position of the lower fork tube limiting mechanism 5 are adjusted according to the size specifications of different batches of workpieces. Then, the lugs 2-3 are positioned by the lug positioning mechanism 7, and the lugs 2-3 are inserted into the rear end of the lower fork tube at the mating point, and the lower fork tube is positioned in cooperation with the front support mechanism 4 and the lower fork tube limiting mechanism 5. Then, the lugs 2-3 and the lower fork tube workpiece are pressed and fixed by the workpiece clamping mechanism 6, and the workpiece is positioned and clamped, and the welding operation can begin. After one side of the workpiece is welded, it can be rotated 180 degrees, and the other side of the workpiece can be welded by a robot or manually.
Claims
1. A welding, positioning, and clamping device for the rear triangle lower fork and lugs of a bicycle frame, characterized in that: The system includes a base plate (3), a lower fork tube front end support mechanism (4), a lower fork tube limiting mechanism (5), an ear plate positioning mechanism (7), and a workpiece clamping mechanism (6); the base plate (3) is mounted on a rotary table at the welding station; the lower fork tube front end support mechanism (4) includes a support plate (4-1) and a support plate mounting seat (4-2), the support plate (4-1) is mounted on one end of the base plate (3) through the support plate mounting seat (4-2), and the height of the upper edge of the support plate (4-1) matches the distance of the curved section (2-2-1) of the lower fork tube from the central axis of the bicycle frame; the lower fork tube front end support mechanism (4-1) includes a base plate (3), a lower fork tube front end support mechanism (4-1), a lower fork tube limiting mechanism (5), an ear plate positioning mechanism (7), and a workpiece clamping mechanism (6); the base plate (3) is mounted on a rotary table at the welding station; the lower fork tube front end support mechanism (4) includes a support plate (4-1) and a support plate mounting seat (4-2), the support plate (4-1) is mounted on one end of the base plate (3 ... The fork tube limiting mechanism (5) is provided with several sets of limiting components, each set of limiting components consists of two limiting blocks on the left and right; the ear plate positioning mechanism (7) includes a positioning seat (7-1) and a positioning block (7-2), the positioning block (7-2) is installed on the other end of the base plate (3) through the positioning seat (7-1), and the shape and size of the positioning block (7-2) match the notch (2-3-1) on the ear plate (2-3); the workpiece clamping mechanism (6) includes a lower fork tube clamping component and an ear plate clamping component, which are located in the middle of the base plate (3) and at the position corresponding to the ear plate positioning mechanism (7), respectively.
2. The rear triangle lower fork and lug welding positioning clamp device of claim 1, wherein: A welding part avoidance hole (3-1) is provided on the base plate (3), and the welding part avoidance hole (3-1) is located below the joint part between the ear piece (2-3) and the lower fork tube.
3. The rear triangle lower fork and lug welding positioning clamp device of claim 2, wherein: The base plate (3) is also provided with an adjustment elongated hole (3-2) for adjusting the front and rear positions of the lower fork tube front end support mechanism; the number of the adjustment elongated holes (3-2) for adjusting the front and rear positions of the lower fork tube front end support mechanism is not less than two sets, which cooperate with the support plate mounting seat (4-2) in the lower fork tube front end support mechanism (4) to adjust the front and rear positions of the support plate (4-1) in the lower fork tube front end support mechanism.
4. The bicycle frame rear triangle lower triangle and lug welding positioning clamp apparatus of claim 3 wherein: The bottom plate (3) is also provided with an adjustment elongated hole (3-3) for the left and right positions of the lower fork tube limiting mechanism; the adjustment elongated hole (3-3) for the left and right positions of the lower fork tube limiting mechanism matches the number of limiting components in the lower fork tube limiting mechanism (5), and cooperates with the limiting block in the lower fork tube limiting mechanism to limit the two sides of the lower fork tube.
5. The bicycle frame rear triangle lower triangle to lug welding positioning clamp apparatus of claim 4 wherein: The support plate mounting seat (4-2) in the lower fork tube front end support mechanism (4) is an L-shaped mounting seat, and there is a long hole (4-2-1) for adjusting the height of the support plate on its vertical wall; the number of the long holes (4-2-1) for adjusting the height of the support plate is not less than two sets, which cooperate with the support plate (4-1) in the lower fork tube front end support mechanism (4) to realize the adjustment of the height of the support plate.
6. The bicycle frame rear triangle lower triangle to lug welding positioning clamp apparatus of claim 5 wherein: The workpiece clamping mechanism (6) includes a lower fork clamping assembly and an ear clamping assembly, both of which are equipped with a lifting seat (6-2), a lifting drive element (6-1), and a lower pressure head (6-3). The lifting drive element (6-1) is fixed on the base plate (3), and the lifting seat (6-2) is mounted on the lifting drive element (6-1). The lifting seat (6-2) extends to the left and right, and vertically downward pressure heads (6-3) are installed at its left and right ends.
7. The bicycle frame rear triangle lower triangle to lug welding positioning clamp apparatus of claim 6 wherein: The lifting drive element (6-1) is a cylinder or a manual caliper.
8. The rear triangle lower fork and lug welding positioning clamp apparatus of any one of claims 1 to 7, wherein: Two sets of lower fork tube limiting mechanisms (5) and ear plate positioning mechanisms (7) are symmetrically arranged on the base plate (3). A workpiece positioning and clamping unit is composed of a lower fork tube front end support mechanism (4), a workpiece clamping mechanism (6), and two sets of lower fork tube limiting mechanisms and ear plate positioning mechanisms arranged symmetrically on the left and right.
9. The bicycle frame rear triangle lower triangle to lug welding positioning clamp apparatus of claim 8 wherein: Two or more workpiece positioning and clamping units are arranged on the base plate (3).