Static point riveting and static spring inserting machine

Abstract

The utility model relates to a stationary point riveting and stationary spring inserting machine, which comprises a rack and a turntable mechanism rotatably arranged on the rack, and a stationary spring pin splitting and riveting device used for inserting a stationary spring into a coil holder and then splitting and riveting the stationary spring into a whole is erected at the top of the rack close to the left rear side; a finished product static spring blanking device is movably arranged between the adjacent static spring pin splitting and riveting device and the turntable mechanism; a static spring feeding device, a first detection device, a contact feeding device, a second detection device, a contact riveting device and a visual detection device are sequentially arranged on the rotating peripheral side of the turntable mechanism; a station is arranged between the adjacent contact riveting device and the visual detection device; a soot blowing assembly is arranged between the finished product static spring discharging device and the static spring feeding device adjacent to the finished product static spring discharging device. According to the utility model, automation of operations such as static spring insertion and contact riveting is realized, all the devices work cooperatively, manual intervention is not needed, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to mechanical equipment, in particular to a static point riveting and static spring inserting machine, which is suitable for operations such as static spring insertion and contact riveting in relay production. Background Art

[0002] Inserting static springs and riveting contacts are critical steps in relay production. Traditional production methods typically rely on manual operation or single-function equipment, resulting in low efficiency, difficulty ensuring accuracy, and high labor intensity. To improve production efficiency and product quality while reducing labor intensity, this static point riveting and static spring insertion machine was designed. Summary of the Invention

[0003] The purpose of this utility model is to provide a machine for automating operations such as static spring insertion and contact riveting, with each device working in concert, eliminating the need for manual intervention and significantly improving production efficiency. The rotation of the turntable mechanism and the arrangement of various workstations allow multiple products to be operated simultaneously at different stages, further increasing overall production speed, thereby resolving the aforementioned technical problems.

[0004] In order to realize the above technical scheme, the technical scheme of the present invention is as follows: a static point riveting and static spring inserting machine, comprising a frame and a turntable mechanism rotatably arranged on the frame, and a static spring pin riveting device for inserting the static spring into the wire rack and then riveting it into one is set up on the top of the frame near the left rear side; a finished static spring unloading device is movably provided between the adjacent static spring pin riveting device and the turntable mechanism, for taking out the finished static spring on the turntable mechanism and rotating it 90° for output; a static spring loading device, a first detection device, a contact loading device, a second detection device, a contact riveting device and a visual detection device are sequentially arranged along the rotating side of the turntable mechanism; there is a work station between the adjacent contact riveting devices and the visual detection device; a soot blowing assembly is provided between the adjacent finished static spring unloading devices and the static spring loading devices.

[0005] Furthermore, the finished static spring unloading device includes a finished static spring unloading robot; a finished product direct vibration transport component is provided under the finished product static spring unloading robot; a finished product pushing component is movably inserted at one end of the finished product direct vibration transport component, and a blocking component is movably provided at the other end; a finished product grabbing and unloading component is movably provided in the output direction of the finished product direct vibration transport component.

[0006] Furthermore, the finished static spring unloading robot includes a finished static spring unloading horizontal moving component mounted on a frame; the output end of the finished static spring unloading horizontal moving component is provided with a finished static spring unloading lifting and moving component that can be lifted and moved in the vertical direction; the output end of the finished static spring unloading lifting and moving component is provided with a flip cylinder; the output end of the finished static spring unloading lifting and moving component is swingably provided with a finished static spring grabbing component; the flip cylinder can drive the finished static spring grabbing component to swing back and forth.

[0007] Furthermore, the static spring feeding device includes a static spring vibration feeding mechanism; a static spring distribution mechanism is provided at the output end of the static spring distribution mechanism; a static spring feeding moving assembly is provided in parallel on one side of the static spring feeding moving assembly; the output end of the static spring feeding moving assembly is provided with a static spring feeding lifting moving assembly that can be raised and lowered; the output end of the static spring feeding lifting moving assembly is provided with a rotatable rotating swing adsorption assembly; a fixture opening assembly is provided on one side of the static spring feeding lifting moving assembly;

[0008] The first detection device includes a first detection bracket; a pressing assembly is arrayed on the first detection bracket; and a reflective photoelectric sensor is provided on the first detection bracket.

[0009] Furthermore, the contact feeding device includes a contact vibration feeding mechanism; the output end of the contact vibration feeding mechanism is rotatably provided with a contact distribution mechanism; and a contact feeding manipulator is movably provided above the contact distribution mechanism;

[0010] The second detection device includes a second detection bracket; the second detection bracket array is provided with a contact detection sensor.

[0011] Furthermore, the contact riveting device includes a contact riveting bracket; a contact riveting upper jig is movably provided on the contact riveting bracket; an extrusion assembly is provided above the contact riveting upper jig and can move back and forth in the horizontal direction; the extrusion assembly can drive the contact riveting upper jig to move back and forth; a lifting assembly is provided at the bottom of the contact riveting bracket; a first contact riveting lower jig is provided below the contact riveting upper jig, which can move closer to or away from it; a second contact riveting lower jig is provided below the first contact riveting lower jig; a pressure detection assembly is provided between adjacent first contact riveting lower jigs and second contact riveting lower jigs; the lifting assembly can drive the second contact riveting lower jig to move back and forth.

[0012] Furthermore, the visual detection device includes a visual detection bracket; an upper camera and a lower camera are symmetrically provided on the visual detection bracket; and a contoured light source is provided along the upper camera / lower camera shooting light path.

[0013] Furthermore, the sootblowing assembly includes a sootblowing bracket; a soot collecting cover is provided on the sootblowing bracket; an opening and closing assembly is provided on the top of the sootblowing bracket, which can be raised and lowered and is used to open the carrying fixture on the turntable mechanism.

[0014] Furthermore, the static spring pin splitting riveting device includes a wire rack carrying track; one end of the wire rack carrying track is equipped with a static spring assembly; the wire rack carrying track is assumed to have a static spring splitting riveting assembly.

[0015] Furthermore, the static spring split rivet assembly includes a static spring split rivet bracket; an upper split rivet jig is provided on the static spring split rivet bracket; and a lower split rivet jig is provided below the upper split rivet jig.

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

[0017] 1) The utility model can effectively improve production efficiency:

[0018] The utility model realizes a fully automated process from static spring loading, inspection, contact loading, riveting, visual inspection to finished product unloading. The setting of the turntable mechanism enables multiple workstations to perform different operations at the same time, and the products pass through each workstation in turn under the rotation of the turntable, which greatly shortens the production cycle. Specifically, when one product is undergoing contact riveting, another product can be subjected to static spring loading at the same time, thereby improving the overall production efficiency. The static spring loading device, contact loading device, contact riveting device and other devices cooperate with each other and are seamlessly connected. The static spring vibration loading mechanism and the contact vibration loading mechanism can quickly and accurately transport materials to the corresponding positions, and the loading manipulator and the material distribution mechanism can efficiently grab and distribute materials, greatly reducing the material waiting time. At the same time, the finished product static spring unloading device can quickly take out and output the finished product without affecting the production of subsequent products, further improving production efficiency.

[0019] 2) This utility model can effectively guarantee product quality:

[0020] The static spring feeding device's static spring distribution mechanism, static spring feeding motion assembly, static spring feeding lifting and moving assembly, and rotary swing suction assembly precisely grasp and assemble the static springs, ensuring accurate positioning of the static springs. The contact feeding device's contact distribution mechanism and contact feeding manipulator accurately place the contacts on the static springs, ensuring precise fit between the contacts and the static springs. The first and second inspection devices, respectively, use a clamping assembly and various sensors to inspect the static springs and contacts, promptly identifying defective products. The visual inspection device utilizes upper and lower cameras and a contoured light source for comprehensive visual inspection of products, further ensuring product appearance quality. These rigorous inspection steps effectively eliminate defective products and ensure consistent and stable product quality. The contact riveting device's upper, first, and second contact riveting lower jigs, as well as the extrusion and lifting assemblies, work together to ensure precise contact riveting operations. The pressure detection assembly monitors riveting pressure in real time, ensuring a secure and reliable riveting process, thereby enhancing product reliability and service life.

[0021] 3) The utility model can effectively reduce labor intensity:

[0022] The fully automated production process of this equipment significantly reduces reliance on manual labor. Workers no longer need to perform arduous manual operations such as loading, assembly, testing, and unloading. Instead, they only need to monitor the equipment's operating status and perform necessary maintenance and adjustments. This reduces labor intensity and improves work comfort and safety. Automated production eliminates errors that can occur with manual operation, such as inaccurate material placement and inconsistent riveting pressure. This not only improves product quality but also reduces scrap and rework rates caused by human error, further reducing labor intensity.

[0023] 4) This utility model enhances the versatility and flexibility of the equipment:

[0024] Each component of this equipment boasts a degree of independence and versatility. For example, the static spring loading device and contact loading device can be adjusted and replaced to suit different product specifications. Furthermore, the carrier fixture on the turntable mechanism can be customized to suit the shape and size of the product, enhancing the equipment's versatility. The equipment can be expanded and upgraded based on production needs. For example, additional detection devices or loading devices can be added to increase production capacity and inspection accuracy. Furthermore, the equipment's control system can be upgraded to enable more complex production processes and a higher level of automation, enhancing the equipment's flexibility and scalability.

[0025] 5) This utility model improves the quality of the production environment:

[0026] The dust collection hood and opening and closing assembly in the sootblowing assembly effectively clean the transport fixtures on the turntable mechanism, preventing dust and impurities from affecting product quality. The dust collection hood also collects dust, maintaining a clean production environment and reducing health hazards to workers. The wire rack transport track, static spring loading assembly, and static spring splitting riveting assembly in the static spring pin splitting riveting device facilitate static spring insertion and splitting riveting operations, reducing the noise and dust pollution that can be caused by manual operations and improving the quality of the production environment.

[0027] In summary, the static point riveting and static spring inserting machine has significant beneficial effects in improving production efficiency, ensuring product quality, reducing labor intensity, enhancing equipment versatility and flexibility, and improving production environment quality through its unique structural design, providing relay manufacturers with an efficient and reliable production equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the disclosure of this invention and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of this invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0029] Figure 1 It is a top view of the static point riveting and static spring inserting machine;

[0030] Figure 2 It is a three-dimensional diagram of the static point riveting and static spring insertion machine;

[0031] Figure 3 It is a schematic diagram of the negative axis side of the static point riveting and static spring insertion machine;

[0032] Figure 4 Schematic diagram of the finished static spring unloading robot. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0035] Please see the attached Figures 1 to 4 As shown: A static point riveting and static spring inserting machine, comprising a frame 1 and a turntable mechanism 2 rotatably arranged on the frame 1, a static spring pin splitting and riveting device 3 for inserting the static spring into the wire rack and then splitting and riveting it into one is set up on the top of the frame 1 near the left rear side; a finished static spring unloading device 4 is movably provided between the adjacent static spring pin splitting and riveting device 3 and the turntable mechanism 2, for taking out the finished static spring on the turntable mechanism 2 and rotating it 90° for output; a static spring loading device 5, a first detection device 6, a contact loading device 7, a second detection device 8, a contact riveting device 9 and a visual inspection device 10 are sequentially arranged along the rotating side of the turntable mechanism 2; there is a work station between the adjacent contact riveting devices 9 and the visual inspection device 10; a soot blowing assembly 11 is provided between the adjacent finished static spring unloading device 4 and the static spring loading device 5.

[0036] Based on the above embodiment, the finished static spring unloading device 4 includes a finished static spring unloading robot 41; a finished product direct vibration transport component 42 is provided under the finished product static spring unloading robot 41; a finished product pushing component 43 is movably inserted at one end of the finished product direct vibration transport component 42, and a blocking component 44 is movably provided at the other end; a finished product grabbing and unloading component 45 is movably provided in the output direction of the finished product direct vibration transport component 42.

[0037] Based on the above embodiment, the finished static spring unloading robot 41 includes a finished static spring unloading horizontal moving component 411 mounted on the frame 1; the output end of the finished static spring unloading horizontal moving component 411 is provided with a finished static spring unloading lifting and moving component 412 that can be lifted and moved in the vertical direction; the output end of the finished static spring unloading lifting and moving component 412 is provided with a flip cylinder 413; the output end of the finished static spring unloading lifting and moving component 412 is swingably provided with a finished static spring grabbing component 414; the flip cylinder 413 can drive the finished static spring grabbing component 414 to swing back and forth.

[0038] Based on the above embodiment, the static spring feeding device 5 includes a static spring vibration feeding mechanism 51; a static spring distribution mechanism 52 is provided at the output end of the static spring distribution mechanism 51; a static spring feeding moving assembly 53 is provided in parallel on one side of the static spring distribution mechanism 52; the output end of the static spring feeding moving assembly 53 is provided with a static spring feeding lifting moving assembly 54 which can be raised and lowered; the output end of the static spring feeding lifting moving assembly 54 is provided with a rotatable rotating swing adsorption assembly 55; a fixture opening assembly is provided on one side of the static spring feeding lifting moving assembly 54;

[0039] The first detection device 6 includes a first detection bracket 61 ; a pressing assembly 62 is arranged in an array on the first detection bracket 61 ; and a reflective photoelectric sensor 63 is provided on the first detection bracket 61 .

[0040] Based on the above embodiment, the contact feeding device 7 includes a contact vibration feeding mechanism 71; the output end of the contact vibration feeding mechanism 71 is rotatably provided with a contact distribution mechanism 72; and a contact feeding manipulator 73 is movably provided above the contact distribution mechanism 72;

[0041] The second detection device 8 includes a second detection bracket 81 ; the second detection bracket 81 is provided with a contact detection sensor 82 in an array.

[0042] Based on the above embodiment, the contact riveting device 9 includes a contact riveting bracket 91; a contact riveting upper jig 92 is movably provided on the contact riveting bracket 91; an extrusion assembly 93 is provided above the contact riveting upper jig 92, which can move back and forth in the horizontal direction; the extrusion assembly 93 can drive the contact riveting upper jig 92 to move back and forth; a lifting assembly 94 is provided at the bottom of the contact riveting bracket 91; a first contact riveting lower jig 95 that can move closer to or away from the contact riveting upper jig 92 is provided below the contact riveting upper jig 92; a second contact riveting lower jig 96 is provided below the first contact riveting lower jig 95; a pressure detection assembly 97 is provided between the adjacent first contact riveting lower jigs 95 and the second contact riveting lower jigs 96; the lifting assembly 94 can drive the second contact riveting lower jig 96 to move back and forth.

[0043] Based on the above embodiment, the visual inspection device 10 includes a visual inspection bracket 101; an upper camera 102 and a lower camera 103 are symmetrically provided on the visual inspection bracket 101; and a profiling light source 104 is provided along the shooting light path of the upper camera 102 / lower camera 103.

[0044] Based on the above embodiment, the sootblowing assembly 11 includes a sootblowing bracket 111; a soot collecting cover 112 is provided on the sootblowing bracket 111; an opening and closing assembly 113 is provided on the top of the sootblowing bracket 111 for opening the carrying fixture on the turntable mechanism 2.

[0045] Based on the above embodiment, the static spring pin splitting riveting device 3 includes a wire rack carrying track 31; one end of the wire rack carrying track 31 is provided with a static spring assembly 32; the wire rack carrying track 31 is assumed to have a static spring splitting riveting assembly 33.

[0046] Based on the above embodiment, the static spring split rivet assembly 33 includes a static spring split rivet bracket 331; an upper split rivet jig 332 is provided on the static spring split rivet bracket 331; and a lower split rivet jig 332 is provided below the upper split rivet jig 332.

[0047] The utility model operates as follows: The static spring vibrating feeding mechanism conveys the static springs to the static spring dispensing mechanism. The various components of the static spring feeding mechanism work together to grab and assemble the static springs into a carrier jig on the turntable mechanism. The turntable mechanism rotates, moving the carrier jig carrying the static springs to the first inspection device, contact feeding device, second inspection device, contact riveting device, and visual inspection device, among other workstations. The contact vibrating feeding mechanism conveys the contacts to the contact dispensing mechanism. The contact feeding robot grabs and assembles the contacts onto the static springs in the carrier jig. The first and second inspection devices inspect the static springs and contacts, respectively. The contact riveting device performs riveting operations on the contacts. The visual inspection device performs visual inspection on the product. When the product completes all process steps, the turntable mechanism moves it to the finished static spring unloading device. The finished static spring unloading robot removes the finished static spring, rotates it 90°, and places it onto the finished product direct vibration transport assembly. The finished product is then discharged by the finished product pushing assembly and finished product grabbing and dispensing assembly. Between the finished static spring unloading device and the static spring loading device, a sootblowing assembly cleans the carrier jig on the turntable mechanism, preparing it for the next assembly. This utility model automates operations such as static spring insertion and contact riveting. The various devices work together, eliminating the need for manual intervention and significantly improving production efficiency. The rotation of the turntable mechanism and the arrangement of various workstations allow multiple products to undergo different stages of operation simultaneously, further increasing overall production speed. The precise design and coordinated operation of the various devices ensure accurate static spring insertion and secure contact riveting. The first inspection device, the second inspection device, and the visual inspection device perform comprehensive product inspections, promptly identifying and rejecting substandard products and ensuring stable and consistent product quality. The automated production process significantly reduces reliance on manual labor, eliminating the need for heavy manual labor, reducing labor intensity and improving work comfort. The various components of the equipment possess a degree of independence and versatility, allowing for adjustment and combination to suit diverse production needs. For example, the static spring loading device and the contact loading device can accommodate static springs and contacts of varying specifications. At the same time, the equipment can be expanded and upgraded according to changes in production processes, enhancing the flexibility and scalability of the equipment. Therefore, the utility model has the advantages of reasonable structure, convenient operation, high efficiency, good quality, and strong versatility. It can effectively improve the production efficiency and product quality of relays and reduce labor intensity.

[0048] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art should be able to utilize the technical contents disclosed above and make equivalent embodiments that are equivalent changes by making slight changes or modifications without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A static point riveting and static spring inserting machine, comprising a frame (1) and a turntable mechanism (2) rotatably arranged on the frame (1), characterized in that: A static spring pin riveting device (3) is installed on the top of the frame (1) near the left rear side, and is used to insert the static spring into the wire rack and then rivet it into one piece; a finished static spring unloading device (4) is movably installed between the adjacent static spring pin riveting device (3) and the turntable mechanism (2), and is used to take out the finished static spring on the turntable mechanism (2) and rotate it 90 degrees for output; a static spring loading device (5), a first detection device (6), a contact loading device (7), a second detection device (8), a contact riveting device (9) and a visual detection device (10) are arranged in sequence along the rotating side of the turntable mechanism (2); a work station is separated between the adjacent contact riveting device (9) and the visual detection device (10); a soot blowing assembly (11) is installed between the adjacent finished static spring unloading device (4) and the static spring loading device (5).

2. The static point riveting and static spring inserting machine according to claim 1, characterized in that: The finished static spring unloading device (4) comprises a finished static spring unloading manipulator (41); a finished product direct vibration transport assembly (42) is provided below the finished product static spring unloading manipulator (41); a finished product pushing assembly (43) is movably inserted at one end of the finished product direct vibration transport assembly (42), and a material blocking assembly (44) is movably provided at the other end; and a finished product grabbing unloading assembly (45) is movably provided in the output direction of the finished product direct vibration transport assembly (42).

3. The static point riveting and static spring inserting machine according to claim 2, characterized in that: The finished static spring blanking manipulator (41) comprises a finished static spring blanking horizontal moving assembly (411) mounted on a frame (1); an output end of the finished static spring blanking horizontal moving assembly (411) is provided with a finished static spring blanking lifting and moving assembly (412) capable of lifting and moving in a vertical direction; an output end of the finished static spring blanking lifting and moving assembly (412) is provided with a flip cylinder (413); a finished static spring grabbing assembly (414) is swingably provided on the output end of the finished static spring blanking lifting and moving assembly (412); and the flip cylinder (413) can drive the finished static spring grabbing assembly (414) to swing back and forth.

4. The static point riveting and static spring inserting machine according to claim 1, characterized in that: The static spring feeding device (5) comprises a static spring vibrating feeding mechanism (51); a static spring distributing mechanism (52) is provided at the output end of the static spring vibrating feeding mechanism (51); a static spring feeding moving assembly (53) is provided in parallel on one side of the static spring distributing mechanism (52); a static spring feeding lifting moving assembly (54) is provided at the output end of the static spring feeding moving assembly (53) in a manner that allows it to be lifted and lowered; a rotating swing adsorption assembly (55) is provided at the output end of the static spring feeding lifting moving assembly (54); a fixture opening assembly is provided on one side of the static spring feeding lifting moving assembly (54); The first detection device (6) comprises a first detection bracket (61); a pressing assembly (62) is arranged in an array on the first detection bracket (61); and a reflective photoelectric sensor (63) is provided on the first detection bracket (61).

5. The static point riveting and static spring inserting machine according to claim 1, characterized in that: The contact feeding device (7) comprises a contact vibration feeding mechanism (71); a contact distribution mechanism (72) is rotatably provided at the output end of the contact vibration feeding mechanism (71); and a contact feeding manipulator (73) is movably provided above the contact distribution mechanism (72); The second detection device (8) comprises a second detection bracket (81); the second detection bracket (81) array is provided with a contact detection sensor (82).

6. The static point riveting and static spring inserting machine according to claim 1, characterized in that: The contact riveting device (9) comprises a contact riveting bracket (91); a contact riveting upper jig (92) is movably provided on the contact riveting bracket (91); an extrusion assembly (93) is provided above the contact riveting upper jig (92) and can reciprocate in the horizontal direction; the extrusion assembly (93) can drive the contact riveting upper jig (92) to move back and forth; a lifting assembly (94) is provided at the bottom of the contact riveting bracket (91); a first contact riveting lower jig (95) is provided below the contact riveting upper jig (92) and can move toward or away from the contact riveting upper jig; a second contact riveting lower jig (96) is provided below the first contact riveting lower jig (95); a pressure detection assembly (97) is provided between the adjacent first contact riveting lower jig (95) and the second contact riveting lower jig (96); the lifting assembly (94) can drive the second contact riveting lower jig (96) to move back and forth.

7. The static point riveting and static spring inserting machine according to claim 1, characterized in that: The visual detection device (10) comprises a visual detection bracket (101); an upper camera (102) and a lower camera (103) are symmetrically provided on the visual detection bracket (101); and a profiling light source (104) is provided along the upper camera (102) / lower camera (103) shooting light path.

8. The static point riveting and static spring inserting machine according to claim 1, characterized in that: The soot blowing assembly (11) comprises a soot blowing bracket (111); a soot collecting cover (112) is provided on the soot blowing bracket (111); and an opening and closing assembly (113) is provided on the top of the soot blowing bracket (111) so as to be liftable and used for opening a carrying fixture on the turntable mechanism (2).

9. The static point riveting and static spring inserting machine according to claim 1, characterized in that: The static spring pin splitting riveting device (3) comprises a wire rack carrying track (31); one end of the wire rack carrying track (31) is provided with a static spring assembly (32); and the wire rack carrying track (31) is provided with a static spring splitting riveting assembly (33).

10. The static point riveting and static spring inserting machine according to claim 9, characterized in that: The static spring split rivet assembly (33) comprises a static spring split rivet bracket (331); an upper split rivet jig (332) is provided on the static spring split rivet bracket (331); and a lower split rivet jig (333) is provided below the upper split rivet jig (332).

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