Single shaft sectional riveting press

Abstract

The utility model provides a kind of single-shaft sectional riveting equipment, and it is suitable for riveting forming to battery cover plate.Single-shaft sectional riveting equipment includes rack and the positioning platform, riveting jig, pressing mechanism and riveting mechanism being set on rack.Positioning platform is provided with the discharge interval for positioning and discharge interval is adjustable.Riveting jig is placed on positioning platform and is located in discharge interval, and riveting jig is used to place pre-assembled battery cover plate, and can be positioned to battery cover plate.Pressing mechanism is slidably arranged in the side of positioning platform, and is provided with the positioning pressing plate for pre-pressing battery cover plate.Riveting mechanism is movably arranged above riveting jig, including riveting head for riveting battery cover plate, and riveting head passes through positioning pressing plate to rivet forming battery cover plate.The single-shaft sectional riveting equipment of the utility model can be suitable for riveting of small size battery cover plate, and riveting effect is good.

Description

Technical Field

[0001] This utility model relates to the field of battery cell manufacturing technology, and in particular to a single-axis segmented riveting device. Background Technology

[0002] The battery cell is the core component of a battery, a basic unit system capable of directly converting chemical energy into electrical energy. In the production and processing of prismatic battery cell casings, the positive and negative terminals on the cell top cover or casing are generally assembled using riveting. Because existing battery cell products are relatively large, the precision requirements for assembly are relatively low. Typically, all components are placed in a mold according to a predetermined order, and then a riveting rod is pressed down to rivet the pre-assembled components into a single structure. While experimental verification has shown that the compression of the inner and outer insulation components can reach the conventional requirement of 30%, the compression ratio of the inner and outer insulation is often random and cannot be precisely controlled.

[0003] As people increasingly pursue thinner and lighter devices, battery products are becoming smaller and smaller. With this reduction in size, the corresponding cover dimensions also decrease. Small-sized covers require significantly higher standards in structural design and dimensional accuracy. The flatness of both ends of the rivets must be precisely controlled. Simultaneously, the compression of both inner and outer insulation components must be effectively controlled to achieve better molding results. Current commercially available riveting machines, based on preliminary verification, have shown that direct riveting leads to excessive compression of the outer insulation, easily causing cracking, while the inner insulation often suffers from insufficient compression. Furthermore, the riveting process can damage the product, rendering the cover's insulation performance unsuitable for use.

[0004] Therefore, it is necessary to provide a single-axis segmented riveting device that can be applied to small-sized battery cell cover plates and has a good riveting effect. Utility Model Content

[0005] The purpose of this invention is to provide a single-axis segmented riveting device that is suitable for riveting small-sized battery cell cover plates and has a good riveting effect.

[0006] To achieve the above objectives, this utility model provides a single-axis segmented riveting device suitable for riveting and forming battery cell cover plates. The battery cell cover plate includes a rivet, an inner insulating component, a cover plate, an outer insulating component, and a gasket. One end of the rivet passes through the inner insulating component, the cover plate, the outer insulating component, and the gasket in sequence. The device includes a frame and components mounted on the frame. The positioning platform is equipped with a feeding range for positioning, and the feeding range is adjustable. The riveting fixture is placed on the positioning platform and located in the feeding area. The riveting fixture is used to place the pre-assembled battery cell cover and can position the battery cell cover. The pressing mechanism is slidably mounted on one side of the positioning platform and is equipped with a positioning pressure plate for pre-pressing the battery cell cover. The riveting mechanism is movably disposed above the riveting fixture, and includes a riveting head for riveting the battery cell cover plate. The riveting head passes through the positioning plate to rivet the battery cell cover plate into shape.

[0007] By adopting the above technical solution, the single-axis segmented riveting equipment of this utility model can pre-press the inner insulation component and the cover plate in the battery cell cover plate through the pressing mechanism, and then use the riveting head to press the rivets, forming in segments. This allows for better control of the compression amount of the inner and outer insulation components, preventing cracking of the outer or inner insulation components due to one-time overall riveting, resulting in a better overall forming effect for the battery cell cover plate. The single-axis segmented riveting equipment includes a positioning platform, a riveting fixture, a pressing mechanism, and a riveting mechanism. The positioning platform is used to place and position the riveting fixture, and can adjust the size of the feeding area according to the fixture size. The riveting fixture is used to place the pre-assembled battery cell cover plate and position it for the pressing mechanism to press the inner insulation component and the cover plate, and for the riveting mechanism to press the rivets. The pressing mechanism is located on one side of the positioning platform and includes a liftable positioning plate for pressing the inner insulation component and the cover plate. The riveting mechanism is movably mounted above the riveting fixture, and includes a riveting head for riveting the battery cell cover plate. The riveting head passes through a positioning plate to rivet the battery cell cover plate as a whole. This utility model's single-axis segmented riveting equipment is suitable for riveting small-sized battery cell cover plates and has a good riveting effect.

[0008] Preferably, the pressing mechanism includes a pressing power component, a positioning plate is installed at the output end of the pressing power component, and the pressing power component is activated to drive the positioning plate to press against the cell cover plate and press the inner insulation component onto the cover plate.

[0009] Preferably, the positioning plate has a forming hole for the riveting head to pass through. The positioning plate is pressed onto the riveting fixture and onto the cell cover to press the inner insulation component onto the cover component. The forming hole is aligned with the riveting position of the cell cover.

[0010] Preferably, the riveting fixture includes a base and a stop block. The base has a material groove and a positioning groove. The battery cell cover is placed in the material groove. The stop block cooperates with the positioning groove to cover the battery cell cover. The stop block has a positioning hole that cooperates with the forming hole. The riveting head passes through the forming hole and the positioning hole in sequence and rivets the battery cell cover into shape.

[0011] Preferably, a positioning protrusion is provided on the positioning plate, and a groove is provided on the stop block. The positioning protrusion presses the inner insulating part against the cover plate part in the groove and aligns the forming hole with the positioning hole.

[0012] Preferably, the riveting mechanism includes a riveting power assembly and a pressure sensor. The pressure sensor is connected to the riveting power assembly, and the riveting head is connected to the pressure sensor. The riveting power assembly actuates to drive the riveting head to rivet the battery cell cover plate. The pressure sensor enables precise control of the compression amount of the outer insulation component.

[0013] Preferably, the positioning platform includes a support base, a first base plate, and a second base plate. The first base plate is disposed on the support base, and the second base plate is disposed on the first base plate. The first base plate is provided with a first adjustment hole, which allows the first base plate to be adjusted and installed in different positions on the support base. The second base plate is provided with a second adjustment hole, which allows the second base plate to be adjusted and installed in different positions on the first base plate.

[0014] Preferably, the first base plate is connected to a first fine-tuning component, which is used to adjust the position of the first base plate on the support; the second base plate is connected to a second fine-tuning component, which is used to adjust the position of the second base plate on the first base plate.

[0015] Preferably, the positioning platform further includes a first positioning block and a second positioning block fixed to the second base plate, and a first positioning component and a second positioning component movably disposed on the side of the support base. The first positioning block, the second positioning block, the first positioning component, and the second positioning component enclose a feeding area for placing the riveting fixture.

[0016] Preferably, the first positioning component includes a first positioning cylinder and a first limiting structure, the first limiting structure being installed at the output end of the first positioning cylinder; the second positioning component includes a second positioning cylinder and a second limiting structure, the second limiting structure being installed at the output end of the second positioning cylinder, the riveting fixture is placed in the feeding zone and abuts against the first positioning block and the second positioning block, the first positioning cylinder and the second positioning cylinder are activated to move the first limiting structure and the second limiting structure closer to the riveting fixture and position the riveting fixture in the feeding zone. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural diagram of a single-axis segmented riveting device provided in an embodiment of the present invention.

[0019] Figure 2 yes Figure 1 The internal structure diagram with the outer frame removed.

[0020] Figure 3 yes Figure 2 Structure diagram of the positioning platform.

[0021] Figure 4 yes Figure 3 Structural diagram showing the combination of the central support, the first base plate, and the second base plate.

[0022] Figure 5 yes Figure 3 The structural diagram of the first positioning component.

[0023] Figure 6 yes Figure 3 The structural diagram of the second positioning component.

[0024] Figure 7 yes Figure 2 Structural diagram of the riveting fixture.

[0025] Figure 8 yes Figure 2 Structural diagram of the pressing mechanism.

[0026] Figure 9 yes Figure 8 Structural diagram of the center positioning pressure plate.

[0027] Figure 10 yes Figure 2 Structural diagram of the riveting mechanism.

[0028] Figure 11 yes Figure 7 Structural diagram of the cell cover plate.

[0029] Explanation of reference numerals in the attached figures: 100. Single-axis segmented riveting equipment; 101. Machine frame; 10. Positioning platform; 11. Support base; 110. Feeding area; 12. First base plate; 121. First adjustment hole; 13. Second base plate; 131. Second adjustment hole; 14. First fine-tuning component; 15. Second fine-tuning component; 16. First positioning block; 17. Second positioning block; 18. First positioning component; 181. First positioning cylinder; 182. First limiting structure; 19. Second positioning component; 191. Second positioning cylinder; 192. Second limiting structure; 20. Riveting fixture; 21. Base; 211. Material trough; 212. Positioning groove; 213. Groove body; 22. Stop block; 221. Positioning hole; 222. Groove; 30. Pressing mechanism; 31. Positioning plate; 311. Positioning protrusion; 312. Forming hole; 32. Pressing power assembly; 40. Riveting mechanism; 41. Riveting head; 42. Riveting power assembly; 43. Pressure sensor; 44. Guide structure; 50. Cell cover plate; 51. Cover plate component; 52. Rivet; 53. Inner insulation component; 54. Outer insulation component; 55. Gasket. Detailed Implementation

[0030] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0031] Please see Figures 1 to 3 and Figure 11 This utility model provides a single-axis segmented riveting device 100, suitable for riveting and forming a battery cell cover plate 50. The battery cell cover plate 50 includes a rivet 52, an inner insulating component 53, a cover plate component 51, an outer insulating component 54, and a gasket 55. One end of the rivet 52 passes through the inner insulating component 53, the cover plate component 51, the outer insulating component 54, and the gasket 55 in sequence. The single-axis segmented riveting device 100 includes a frame 101 and a positioning platform 10, a riveting fixture 20, a pressing mechanism 30, and a riveting mechanism 40 mounted on the frame 101. The positioning platform 10 is provided with a feeding section 110 for positioning the riveting fixture 20, and the feeding section 110 is adjustable and can be adaptively adjusted according to the specific size of the riveting fixture 20. A riveting fixture 20 is placed on the positioning platform 10 and located within the feeding area 110. The riveting fixture 20 is used to place the pre-assembled cell cover plate 50 and to position the cell cover plate 50. Furthermore, a pressing mechanism 30 is slidably disposed on one side of the positioning platform 10. The pressing mechanism 30 is provided with a positioning pressure plate 31 for pre-pressing the cell cover plate 50. The positioning pressure plate 31 is used to press the cover plate 51 and the inner insulation member 53 together. On the other hand, a riveting mechanism 40 is movably disposed above the riveting fixture 20. The riveting mechanism 40 includes a riveting head 41 for riveting the cell cover plate 50. The riveting head 41 passes through the positioning pressure plate 31 to rivet the cell cover plate 50 into shape.

[0032] By adopting the above technical solution, the single-axis segmented riveting equipment 100 of this utility model can pre-press the inner insulating component 53 and the cover plate component 51 in the battery cell cover plate 50 through the pressing mechanism 30, and then use the riveting head 41 to press the rivets 52, forming in segments. This allows for better control of the compression amount of the inner insulating component 54 and the outer insulating component 53, preventing cracking of the outer insulating component 53 or the inner insulating component 54 due to one-time riveting. The overall forming effect of the battery cell cover plate 50 is better. The single-axis segmented riveting equipment 100 includes a positioning platform 10, a riveting fixture 20, a pressing mechanism 30, and a riveting mechanism 40. The positioning platform 10 is used to place and position the riveting fixture 20, and can adjust the size of the feeding area 110 according to the size of the fixture. The riveting fixture 20 is used to place the pre-assembled battery cell cover 50 and position it so that the pressing mechanism 30 can press the inner insulation component 53 and the cover component 51 together, and the riveting mechanism 40 can rivet the rivets 52 together. The pressing mechanism 30 is located on one side of the positioning platform 10 and includes a lifting and movable positioning plate 31, which is used to press the inner insulation component 53 and the cover component 51 together. The riveting mechanism 40 is movably arranged above the riveting fixture 20 and includes a riveting head 41 for riveting the battery cell cover 50. The riveting head 41 passes through the positioning plate 31 to rivet the battery cell cover 50 as a whole. The single-axis segmented riveting equipment 100 of this utility model is suitable for riveting small-sized battery cell cover 50 and has a good riveting effect.

[0033] Please see Figure 1 , Figure 2 and Figures 7 to 11In some optional embodiments, the pressing mechanism 30 includes a pressing power assembly 32, and a positioning plate 31 is installed at the output end of the pressing power assembly 32. The pressing power assembly 32 actuates to drive the positioning plate 31 to move up and down along the slide rail and press against the cell cover plate 50 to press the inner insulation member 53 onto the cover plate 51. The positioning plate 31 has a forming hole 312 for the riveting head 41 to pass through. The positioning plate 31 presses against the riveting fixture 20 and the cell cover plate 50 to press the inner insulation member 53 onto the cover plate 51. The forming hole 312 is aligned with the riveting position of the cell cover plate 50. On the other hand, the riveting fixture 20 includes a base 21 and a stop 22. The base 21 has a material groove 211 and a positioning groove 212. The pre-assembled cell cover plate 50 is placed in the material groove 211, and the stop 22 cooperates with the positioning groove 212 to cover the cell cover plate 50. A positioning hole 221 is provided on the stop block 22 to cooperate with the forming hole 312. The riveting head 41 passes through the forming hole 312 and the positioning hole 221 in sequence to rivet the cell cover plate 50. Specifically, a positioning protrusion 311 is provided on the positioning plate 31, and a groove 222 is provided on the stop block 22. The riveting position of the cell cover plate 50 can partially protrude from the groove 222. The forming hole 312 in the positioning protrusion 311 passes through the gasket 55 and the outer insulating member 54. The positioning protrusion 311 acts on the cover plate 51 and presses the inner insulating member 53 at the bottom of the material groove 211 with the cover plate 51, and aligns the forming hole 312 with the positioning hole 221 so that the riveting head 41 can pass through the forming hole 312 to rivet the cell cover plate 50.

[0034] Please see Figure 7 In some optional embodiments, the riveting fixture 20 includes a base 21 and a stop 22. The base 21 also has a positioning top block for supporting the cell cover 50, and the top block can adjust the support position of the cell cover 50. The material groove 211 is also recessed inward to divide the material groove 211 into two areas, so as to effectively avoid direct rigid contact between the entire cell cover 50 and the material groove 211 during riveting, thereby releasing stress during riveting and effectively protecting the entire cell cover 50. The stop 22 is placed in the positioning groove 212 and covers the cell cover 50 in the material groove 211. The stop 22 has a positioning hole 221 for aligning the riveting position of the cell cover 50. The positioning pressure plate 31 and the riveting head 41 can pass through the positioning hole 221 to press the riveting position. On the other hand, a groove 213 is provided on the side of the base 21 to facilitate positioning. The first positioning component 18 and the second positioning component 19 on the positioning platform 10 act on the corresponding groove 213, which can more stably position the entire riveting fixture 20, resulting in better positioning and more stable placement.

[0035] Please see Figure 1 , Figure 2 and Figure 10In some optional embodiments, the riveting mechanism 40 includes a riveting power assembly 42, a pressure sensor 43, and a guide structure 44. The pressure sensor 43 is connected to the riveting power assembly 42, and the riveting head 41 is connected to the pressure sensor 43 and mounted on the guide structure 44. The riveting power assembly 42 actuates to drive the riveting head 41 to rivet the battery cell cover plate 50. The pressure sensor 43 allows for precise control of the compression amount of the outer insulation component 54. Specifically, the riveting power assembly 42 is a motor, which precisely controls the riveting action. The pressure sensor 43 monitors the riveting pressure in real time, precisely controlling the riveting amount and the compression amount of the outer insulation component 54, while also better controlling the overall height of the product.

[0036] Please see Figures 3 to 6 In some optional embodiments, the positioning platform 10 includes a support base 11, a first base plate 12, and a second base plate 13. The first base plate 12 is disposed on the support base 11, and the second base plate 13 is disposed on the first base plate 12. The first base plate 12 is used for lateral position adjustment and has a first adjustment hole 121, the length of which is arranged laterally, allowing the first base plate 12 to be adjusted and installed at different positions on the support base 11. The second base plate 13 is used for longitudinal position adjustment and has a second adjustment hole 131, the length of which is arranged longitudinally, allowing the second base plate 13 to be adjusted and installed at different positions on the first base plate 12. Specifically, a first fine-tuning component 14 is connected to the first base plate 12 to adjust the position of the first base plate 12 on the support base 11, and then it is installed on the support base 11 through the first adjustment hole 121. The second base plate 13 is connected to a second fine-tuning component 15, which is used to adjust the position of the second base plate 13 on the first base plate 12, and then it is installed on the first base plate 12 through the second adjustment hole 131. The adjustment of the first base plate 12 and the second base plate 13 allows the riveting fixture 20 to be better aligned with the pressing mechanism 30 and the riveting mechanism 40, and it is also suitable for riveting fixtures 20 of various sizes.

[0037] Please see Figures 3 to 6In some optional embodiments, the positioning platform 10 further includes a first positioning block 16 and a second positioning block 17 fixed to the second base plate 13, and a first positioning component 18 and a second positioning component 19 movably disposed on the side of the support base 11. The first positioning block 16, the second positioning block 17, and the first positioning component 18 and the second positioning component 19 enclose a feeding area 110 for placing the riveting fixture 20. The first positioning block 16 and the second positioning block 17 are fixed to the second base plate 13. On the other hand, the first positioning component 18 includes a first positioning cylinder 181 and a first limiting structure 182, the first limiting structure 182 being mounted on the output end of the first positioning cylinder 181. The second positioning component 19 includes a second positioning cylinder 191 and a second limiting structure 192, the second limiting structure 192 being mounted on the output end of the second positioning cylinder 191. Specifically, the riveting fixture 20 is placed within the feeding zone 110 and abuts against the first positioning block 16 and the second positioning block 17. The first base plate 12 and the second base plate 13 have spaces for the first limiting structure 182 and the second limiting structure 192 to move. The first positioning cylinder 181 and the second positioning cylinder 191 actuate to move the first limiting structure 182 and the second limiting structure 192 closer to the riveting fixture 20, and act on the groove 213 on the side of the support base 11 of the riveting fixture 20, thereby positioning the riveting fixture 20 within the feeding zone 110, and ensuring stable positioning.

[0038] like Figures 1 to 11As shown, the single-axis segmented riveting equipment 100 of this utility model can pre-press the inner insulation component 53 and the cover plate component 51 in the battery cell cover plate 50 through the pressing mechanism 30, and then use the riveting head 41 to press the rivets 52, forming in segments. This segmented forming allows for better control of the compression amount of the inner insulation component 54 and the outer insulation component 53, preventing cracking of the outer insulation component 53 or the inner insulation component 54 due to one-time riveting. The overall forming effect of the battery cell cover plate 50 is better. The single-axis segmented riveting equipment 100 includes a positioning platform 10, a riveting fixture 20, a pressing mechanism 30, and a riveting mechanism 40. The positioning platform 10 is used to place and position the riveting fixture 20, and can adjust the size of the feeding area 110 according to the size of the fixture. The riveting fixture 20 is used to place the pre-assembled battery cell cover 50 and position it so that the pressing mechanism 30 can press the inner insulation component 53 and the cover component 51 together, and the riveting mechanism 40 can rivet the rivets 52 together. The pressing mechanism 30 is located on one side of the positioning platform 10 and includes a lifting and movable positioning plate 31, which is used to press the inner insulation component 53 and the cover component 51 together. The riveting mechanism 40 is movably arranged above the riveting fixture 20 and includes a riveting head 41 for riveting the battery cell cover 50. The riveting head 41 passes through the positioning plate 31 to rivet the battery cell cover 50 as a whole. The single-axis segmented riveting equipment 100 of this utility model is suitable for riveting small-sized battery cell cover 50 and has a good riveting effect.

[0039] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.

Claims

1. A single-axis segmented riveting device, suitable for riveting and forming a battery cell cover plate, the battery cell cover plate comprising a rivet, an inner insulating component, a cover plate component, an outer insulating component, and a gasket, wherein one end of the rivet passes sequentially through the inner insulating component, the cover plate component, the outer insulating component, and the gasket, characterized in that, Includes the rack and the components mounted on the rack: The positioning platform is equipped with a feeding range for positioning, and the feeding range is adjustable; A riveting fixture is placed on the positioning platform and located within the feeding area. The riveting fixture is used to place the pre-assembled battery cell cover and can position the battery cell cover. The pressing mechanism is slidably disposed on one side of the positioning platform and is provided with a positioning pressure plate for pre-pressing the battery cell cover plate; The riveting mechanism is movably disposed above the riveting fixture, and includes a riveting head for riveting the battery cell cover plate. The riveting head passes through the positioning pressure plate to rivet the battery cell cover plate into shape.

2. The single-axis segmented riveting device according to claim 1, characterized in that, The pressing mechanism includes a pressing power component, and the positioning pressure plate is installed at the output end of the pressing power component. The pressing power component is activated to drive the positioning pressure plate to press against the battery cell cover plate and press the inner insulation component onto the cover plate.

3. The single-axis segmented riveting equipment according to claim 1, characterized in that, The positioning plate has a forming hole for the riveting head to pass through. The positioning plate presses against the riveting fixture and the battery cell cover to press the inner insulation component onto the cover. The forming hole is aligned with the riveting position of the battery cell cover.

4. The single-axis segmented riveting equipment according to claim 3, characterized in that, The riveting fixture includes a base and a stop block. The base has a material groove and a positioning groove. The battery cell cover is placed in the material groove. The stop block cooperates with the positioning groove to cover the battery cell cover. The stop block has a positioning hole that cooperates with the forming hole. The riveting head passes through the forming hole and the positioning hole in sequence and rivets the battery cell cover into shape.

5. The single-axis segmented riveting device according to claim 4, characterized in that, The positioning plate is provided with a protruding positioning protrusion, and the stop block is provided with a downward recessed groove. The positioning protrusion presses the inner insulating component onto the cover plate component in the groove and aligns the forming hole with the positioning hole.

6. The single-axis segmented riveting device according to claim 1, characterized in that, The riveting mechanism includes a riveting power assembly and a pressure sensor. The pressure sensor is connected to the riveting power assembly, and the riveting head is connected to the pressure sensor. The riveting power assembly is activated to drive the riveting head to rivet the battery cell cover plate. The pressure sensor is used to precisely control the compression amount of the outer insulation component.

7. The single-axis segmented riveting device according to claim 1, characterized in that, The positioning platform includes a support base, a first base plate, and a second base plate. The first base plate is disposed on the support base, and the second base plate is disposed on the first base plate. The first base plate is provided with a first adjustment hole, which allows the first base plate to be adjusted and installed in different positions on the support base. The second base plate is provided with a second adjustment hole, which allows the second base plate to be adjusted and installed in different positions on the first base plate.

8. The single-axis segmented riveting device according to claim 7, characterized in that, The first base plate is connected to a first fine-tuning component, which is used to adjust the position of the first base plate on the support; the second base plate is connected to a second fine-tuning component, which is used to adjust the position of the second base plate on the first base plate.

9. The single-axis segmented riveting device according to claim 7, characterized in that, The positioning platform further includes a first positioning block and a second positioning block fixed to the second base plate, and a first positioning component and a second positioning component movably disposed on the side of the support base. The first positioning block, the second positioning block, the first positioning component, and the second positioning component enclose the feeding area for placing the riveting fixture.

10. The single-axis segmented riveting device according to claim 9, characterized in that, The first positioning component includes a first positioning cylinder and a first limiting structure, the first limiting structure being installed at the output end of the first positioning cylinder; the second positioning component includes a second positioning cylinder and a second limiting structure, the second limiting structure being installed at the output end of the second positioning cylinder; the riveting fixture is placed within the feeding zone and abuts against the first positioning block and the second positioning block; the first positioning cylinder and the second positioning cylinder are activated to move the first limiting structure and the second limiting structure closer to the riveting fixture and position the riveting fixture within the feeding zone.

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