A riveting tool for a magnetic yoke structure

Abstract

The utility model relates to a kind of riveting tool of magnetic yoke structure, the magnetic yoke structure includes lower armature and upper armature, the bottom of the lower armature is equipped with fixed plate, the riveting tool includes positioning seat, riveting mechanism and positioning compacting mechanism, positioning groove cavity for placing lower armature and the accommodation groove cavity located below positioning groove cavity are equipped in the positioning seat, the bottom of the positioning groove cavity is equipped with the support portion for supporting lower armature and the bottom communication hole of the communication positioning groove cavity and accommodation groove cavity;The accommodation groove cavity is used to accommodate the fixed plate of the bottom of lower armature;The positioning compacting mechanism includes the positioning block that can be moved up and down above positioning groove cavity, and the positioning block is used to press down the upper armature on lower armature;The riveting mechanism includes the riveting head that can be moved up and down above positioning groove cavity, and the riveting head is used to extrude the lower armature portion that is engaged with the upper armature, to make lower armature and upper armature riveting.

Description

Technical Field

[0001] This utility model relates to the field of riveting technology, specifically to a riveting fixture with a magnetic yoke structure. Background Technology

[0002] In a magnetic yoke structure workpiece, see Appendix Figure 1 and attached Figure 2 As shown, it mainly includes a U-shaped lower armature, an upper armature, and other parts mounted on the lower or upper armature. During assembly, the upper armature needs to be fixed to the opening of the U-shaped lower armature and to the upper ends of the two side plates of the lower armature. Existing technologies generally use welding or riveting to fix the upper armature to the lower armature. However, the connection between the upper and lower armature occurs after all other parts have been assembled. At this stage, both welding and riveting are easily affected by other parts on the lower and upper armatures, making it difficult to proceed smoothly. Furthermore, riveting can easily create pits and protrusions on the sheet metal due to the presence of a die, while welding is less aesthetically pleasing and more complex to perform.

[0003] Dieless riveting (also a type of rivetless riveting) is a novel riveting process that eliminates the need for traditional dies. Its basic principle involves the interaction between the demolding device, the punch, and the sheet metal, causing plastic deformation under pressure to form a joint. This technology possesses significant innovation and application value in riveting. The core of dieless riveting lies in utilizing the workpiece's inherent structure as support, avoiding the use of dies required in traditional riveting processes. However, dieless riveting demands precise operating posture and minimal interference space, requiring operators with considerable experience and skill. Its application is limited in confined spaces, making it unsuitable for complex workpieces like magnetic yoke structures. The presence of other parts on the upper and lower armatures of the magnetic yoke can cause interference between the workpiece and the riveting fixture, hindering the successful riveting of the upper and lower armatures. Utility Model Content

[0004] The purpose of this invention is to provide a riveting fixture for a magnetic yoke structure, which can smoothly and flexibly realize die-free riveting between the upper and lower armatures of the magnetic yoke structure workpiece, avoiding interference problems caused by other parts.

[0005] To achieve the above objectives, this utility model provides a riveting fixture for a magnetic yoke structure. The magnetic yoke structure includes a lower armature and an upper armature. The bottom of the lower armature is provided with a fixing plate. The riveting fixture includes a positioning seat, a riveting mechanism, and a positioning and clamping mechanism. The positioning seat has a positioning groove for placing the lower armature and a receiving groove located below the positioning groove. The bottom of the positioning groove has a support part for supporting the lower armature and a bottom connecting hole connecting the positioning groove and the receiving groove. The receiving groove is used to accommodate the fixing plate at the bottom of the lower armature. The positioning and clamping mechanism includes a positioning block located above the positioning groove and capable of moving up and down. The positioning block is used to press down the upper armature placed on the lower armature. The riveting mechanism includes a riveting head located above the positioning groove and capable of moving up and down. The riveting head is used to press and engage the lower armature portion that is engaged with the upper armature, so that the lower armature and the upper armature are riveted together.

[0006] Furthermore, the lower armature is U-shaped and includes a bottom plate and two side plates on the left and right. The side wall of the positioning groove cavity is provided with two opposing limiting sides that are respectively used to abut against the two side plates of the lower armature.

[0007] Furthermore, the riveting mechanism also includes a connecting seat, and the riveting head is fixed to the connecting seat; the positioning block is installed on the connecting seat and can move up and down relative to the connecting seat; the positioning and pressing mechanism also includes an elastic structure installed on the connecting seat, the elastic structure acts on the positioning block and provides a downward elastic force, and when the positioning block is not subjected to upward pressure, its lower end is lower than the lower end of the riveting head.

[0008] Furthermore, the connecting seat includes a lower seat and a lower base. The top surface of the lower seat is provided with a downward through-hole of a riveting head stepped hole. The top of the riveting head is provided with a stepped rod cap. The lower end of the riveting head passes through the riveting head stepped hole and the stepped rod cap is located in the riveting head stepped hole. The lower seat is fixedly connected to the upper end surface of the lower seat and pressed against the stepped rod cap.

[0009] Furthermore, the riveting head has multiple stepped holes, arranged in a rectangular array or a ring array.

[0010] Furthermore, the connecting seat is provided with a vertically arranged guide hole, and the positioning block is disposed in the guide hole and can slide up and down.

[0011] Furthermore, the elastic structure includes a compression spring, the upper and lower ends of which abut against the connecting seat (41) and the positioning block, respectively.

[0012] Furthermore, the upper end face of the positioning block is provided with a spring receiving hole, and the lower end of the compression spring is located in the spring receiving hole.

[0013] Furthermore, the bottom end face of the positioning block is provided with a clearance hole for accommodating the components on the upper armature.

[0014] As described above, the riveting fixture of this utility model has the following beneficial effects:

[0015] 1. The lower armature is installed and stabilized through the positioning slot of the positioning seat, and the receiving slot accommodates the fixing plate and other parts at the bottom of the lower armature to avoid interference and ensure the stability of the lower armature during riveting. The positioning and clamping mechanism first presses the upper armature firmly onto the lower armature, and then the riveting head presses down on the riveting part (i.e., the riveting protrusion) of the lower armature, causing it to deform and complete the riveting with the upper armature. The lower armature itself serves as a support, realizing dieless riveting of the lower and upper armatures. The operation is stable and reliable. During riveting, the riveting head contacts the riveting part on the lower armature, which facilitates avoiding other parts or structures. In addition, it can also realize multi-point riveting as needed, improving connection accuracy and consistency.

[0016] 2. In the riveting mechanism, the riveting head is pressed and installed in the stepped hole of the riveting head by the upper seat, and the bolt connection between the lower seat and the upper seat realizes the quick-change installation of the lower seat and the riveting head. The riveting head or the lower seat can be set according to actual needs to meet the needs of different working conditions, and it is flexible and convenient to use.

[0017] 3. By setting a receiving cavity in the positioning seat and setting a clearance hole on the positioning pressure block, it is possible to avoid other parts (including but not limited to the fixing plate) on the lower armature and upper armature during the riveting process, ensuring the smooth progress of the riveting work. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the magnetic yoke structure workpiece in this utility model.

[0019] Figure 2 This is a schematic diagram of the lower armature.

[0020] Figure 3 This is a schematic diagram of the upper armature.

[0021] Figure 4 This is a structural schematic diagram of the riveting fixture of this utility model.

[0022] Figure 5 for Figure 4 Front view.

[0023] Figure 6 for Figure 4 Side view.

[0024] Figure 7 for Figure 6 DD section view.

[0025] Figure 8 for Figure 6CC-direction sectional view.

[0026] Figure 9 This is a schematic diagram of the lower seat in this utility model.

[0027] Figure 10 This is a schematic diagram of the riveting head in this utility model.

[0028] Figure 11 This is a schematic diagram of the positioning and clamping mechanism in this utility model.

[0029] Figure 12 This is a schematic diagram of the riveting fixture of this utility model.

[0030] Figure 13 for Figure 12 Side view.

[0031] Explanation of icon numbers:

[0032] 1. Lower armature; 11. Bottom plate; 12. Side plate; 13. Riveting contact surface; 14. Riveting protrusion; 15. Fixing plate.

[0033] 2. Upper armature; 21. Riveting hole.

[0034] 3. Positioning seat; 31. Positioning groove; 311. Support part; 312. Bottom connecting hole; 313. Limiting side; 314. Limiting stop surface; 32. Accommodating groove.

[0035] 4. Riveting mechanism; 41. Connecting seat; 411. Lower seat; 412. Upper seat; 413. Connecting column; 414. Stepped hole of riveting head; 415. Guide hole; 416. Limiting hole; 42. Riveting head; 421. Stepped rod cap; 422. Pointed head.

[0036] 5. Positioning and clamping mechanism; 51. Positioning block; 511. Limiting edge plate; 512. Clearance hole; 513. Spring receiving hole; 52. Elastic structure; 521. Compression spring. Detailed Implementation

[0037] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0038] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0039] See Figures 4 to 13 This utility model provides a riveting fixture for a magnetic yoke structure. The magnetic yoke structure includes a lower armature 1 and an upper armature 2. The lower armature 1 has a fixing plate 15 at its bottom, which is a metal part used to fix the lower armature 1 to the bimetallic structure. The lower armature 1 is U-shaped and includes a bottom plate 11 and two side plates 12. The fixing plate 15 is located on the bottom surface of the bottom plate 11. The upper armature 2 is a flat plate structure with riveting holes 21 on both opposite sides. Riveting protrusions 14 are provided on the upper side of the side plate 12 near the U-shaped opening. This upper side is referred to as the riveting contact surface 13. During riveting, the upper armature 2 is riveted onto the riveting contact surface 13. Each riveting contact surface 13 has two riveting protrusions 14. The lower armature 1 and the upper armature 2 can also be other shapes. The riveting fixture of this utility model includes a positioning seat 3, a riveting mechanism 4, and a positioning and clamping mechanism 5. The positioning seat 3 is provided with a positioning groove 31 for placing the lower armature 1 and a receiving groove 32 located below the positioning groove 31. The bottom of the positioning groove 31 is provided with a support part 311 for supporting the lower armature 1 and a bottom connecting hole 312 connecting the positioning groove 31 and the receiving groove 32. The receiving groove 32 is used to accommodate the fixing plate 15 at the bottom of the lower armature 1. The positioning and clamping mechanism 5 includes a positioning block 51 located above the positioning groove 31 and capable of moving up and down. The positioning block 51 is used to press down the upper armature 2 placed on the lower armature 1. The riveting mechanism 4 includes a riveting head 42 located above the positioning groove 31 and capable of moving up and down. The riveting head 42 is used to press down and squeeze the part that is engaged with the upper armature 2 so that the lower armature 1 and the upper armature 2 are riveted together.

[0040] The main working principle of this riveting fixture is as follows: (See attached diagram) Figure 12 and Figure 13As shown, during the riveting process, the lower armature 1 is first placed into the positioning slot 31 of the positioning seat 3. The bottom edge plate 11 of the lower armature 1 is supported by the support part 311. The size and shape of the bottom connecting hole 312 can be set according to actual needs, so that the support part 311 has a suitable size to ensure the support area for the bottom of the lower armature 1 and ensure stable support. The bottom of the lower armature 1 is provided with a fixing plate 15, or other components. The fixing plate 15 can extend into the receiving slot 32 through the bottom connecting hole 312 to avoid interference. The receiving slot 32 also has the function of reducing the total mass of the positioning seat 3. The specific structural shape of the positioning groove 31 can be designed according to the lower armature 1. It can stabilize the position of the lower armature 1 and provide stable support. After the lower armature 1 is placed, the riveting contact surface 13 and the riveting protrusion 14 on it face upward. Then, the upper armature 2 is placed on the riveting contact surface 13 of the lower armature 1, and the riveting protrusion 14 passes through the corresponding riveting hole 21 and protrudes from the upper surface of the upper armature 2. The positioning seat 3 can be fixed in the riveting machine. After the lower armature 1 and the upper armature 2 are installed, the positioning pressure block 51 of the positioning and pressing mechanism 5 presses down on the upper armature 2, so that the upper armature 2 is stably pressed on the riveting contact surface 13 of the lower armature 1, preventing the two from being misaligned. Then, the riveting head 42 moves downward and presses down on the riveting protrusion 14, causing it to deform and expand, thus interfering with the riveting hole 21. Simultaneously, the riveting protrusion 14 presses tightly against the upper periphery of the riveting hole 21, thereby riveting and fixing the upper armature 2 to the lower armature 1, achieving a stable riveting connection between the upper armature 2 and the lower armature 1. Multiple riveting heads 42 are provided, the same number as the riveting protrusions 14, allowing multiple riveting protrusions 14 to be riveted to the riveting hole 21 simultaneously during a single downward press of the riveting mechanism 4. Even when there is only one riveting head 42 or fewer than the number of riveting protrusions 14, multiple pressing operations can complete the riveting of all riveting protrusions 14 to the riveting hole 21. The riveting fixture of this invention stabilizes the position of the lower armature 1 and avoids interference through the positioning slot 31 and receiving slot 32 of the positioning seat 3. The positioning and clamping mechanism 5 first stably clamps the upper armature 2 onto the lower armature 1, and then the riveting head 42 presses down on the riveting part of the lower armature 1 to smoothly achieve riveting. It can use the lower armature 1 as a support to achieve die-free riveting of the lower armature 1 and upper armature 2, ensuring stable and reliable operation. The riveting head 42 and the riveting part of the lower armature 1 (i.e., the riveting protrusion 14) can be flexibly set according to the connection requirements of the two parts, thereby optimizing the riveting strength and improving the deformation of the parts during riveting. During riveting, the contact between the riveting head 42 and the riveting part on the lower armature 1 facilitates avoiding other parts or structures, ensuring smooth riveting work. Furthermore, it can simultaneously achieve multi-point riveting as needed, improving connection accuracy and consistency. Compared to conventional riveting methods, it can reduce the generation of pits and protrusions on the parts.

[0041] See Figures 1 to 13 The present invention will be further described below with reference to specific embodiments:

[0042] In this embodiment, see Figure 1 , Figure 4 and Figure 12 As a preferred design, the positioning cavity 31 is square according to the shape of the lower armature 1. The side wall of the positioning cavity 31 is provided with two opposing limiting sides 313, which are respectively used to abut against the two side plates 12 of the lower armature 1. When the lower armature 1 is placed in the positioning cavity 31, the left and right side plates 12 abut against the limiting sides 313 on the left and right sides of the positioning cavity 31, thereby stabilizing the left and right position of the lower armature 1. When the upper armature 2 is placed on the riveting contact surface 13 of the lower armature 1, the inner side of the riveting protrusion 14 (i.e. the side of the side plate 12 near the middle cavity) abuts against the wall of the riveting hole 21, which can effectively prevent the side plate 12 from deforming and bending inward when the riveting protrusion 14 is pressed. Furthermore, a limiting stop 314 is provided at the rear side of the positioning cavity 31 for abutting against the rear side of the lower armature 1. The limiting stop 314 is a U-shaped surface with a certain clearance space. When the lower armature 1 is installed, it can be inserted from the upper or front side of the positioning cavity 31 for easy installation. After installation, the rear side of the lower armature 1 abuts against the limiting stop 314, thereby limiting the rear position of the lower armature 1. Other components extending from the lower armature 1 to the rear side of the side plate 12 can extend into the clearance space in the limiting stop 314. The limiting stop 314 can also be set at the front side of the positioning cavity 31. In this way, at least three directions of the lower armature 1 are limited. Other components installed on the lower armature 1 and extending from the front and rear sides of the lower armature 1 can also extend from the front and rear sides of the positioning cavity 31 without causing interference.

[0043] In this embodiment, see Figure 4 , Figure 7 and Figure 8As a preferred design, the riveting mechanism 4 also includes a connecting seat 41, to which the riveting head 42 is fixed. The connecting seat 41 is used to connect with the lifting drive unit in the riveting machine to drive the riveting head 42 to move up and down. The positioning and clamping mechanism 5 has a positioning block 51 mounted on the connecting seat 41 and capable of moving up and down relative to the connecting seat 41. The positioning and clamping mechanism 5 also includes an elastic structure 52 mounted on the connecting seat 41. The elastic structure 52 acts on the positioning block 51 and provides a downward elastic force. When the positioning block 51 is not subjected to upward pressure, its lower end is lower than the lower end of the riveting head 42. In use, after the lower armature 1 and upper armature 2 are installed, the connecting seat 41 of the driving riveting mechanism 4 moves downward. The positioning and clamping mechanism 5 descends synchronously with the connecting seat 41. During the descent, since the lower end of the positioning block 51 is lower than the lower end of the riveting head 42 when it is not under upward pressure, the lower end of the positioning block 51 will first contact the upper armature 2. At the same time, the connecting seat 41 can continue to move downward. Through the elastic force of the elastic structure 52, the positioning block 51 applies pressure to the upper armature 2, first stabilizing the upper armature 2 on the riveting contact surface 13 of the lower armature 1, preventing misalignment between the two. Then the riveting head 42 contacts and presses down on the riveting protrusion 14, causing the riveting protrusion 14 to deform. By adopting this design, the positioning and clamping mechanism 5 is integrated into the positioning block 51 of the riveting mechanism 4, which can rise and fall synchronously. During the downward riveting process, the upper armature 2 is clamped and positioned. The structure is simpler and more compact, easier to use, and the downward pressing position can be located at the middle of the upper armature 2. In other embodiments, the positioning and pressing mechanism 5 can also adopt other suitable existing mechanisms, wherein the lifting drive of the positioning block 51 can be separated from the lifting drive of the riveting mechanism 4. The positioning block 51 achieves lifting and pressing operations through independent hydraulic or pneumatic drive. At this time, the riveting head 42 can move up and down relative to the positioning block 51, ensuring that the positioning block 51 presses on the upper armature 2 first, and then the riveting head 42 can continue to press down smoothly.

[0044] In this embodiment, see Figure 4 , Figure 7 and Figure 10As a preferred design, the connecting seat 41 includes a lower seat 411 and an upper seat 412. The top surface of the upper seat 412 is also provided with a connecting post 413, which is used to facilitate connection with the lifting drive unit of the riveting machine. The top surface of the lower seat 4111 is provided with a downward-through riveting head stepped hole 414, which consists of two holes, one larger at the top and one smaller at the bottom. The top of the riveting head 42 is provided with a stepped rod cap 421. The lower end of the riveting head 42 passes through the riveting head stepped hole 414, and the stepped rod cap 421 is located in the riveting head stepped hole 414. The upper seat 412 is fixedly connected to the upper end face of the lower seat 411 and pressed against the stepped rod cap 421, thereby fixing the riveting head 42 in the connecting seat 41. After the upper seat 412 is separated from the lower seat 411, the riveting head 42 can be pulled upwards, making disassembly and assembly convenient. In this embodiment, there are four stepped holes 414 in the riveting head, arranged in a rectangular array. Each stepped hole 414 houses one riveting head 42, so that in one riveting operation, all four riveting heads 42 simultaneously press down on the four riveting protrusions 14. In other embodiments, the riveting heads 42 can also be installed in the connecting seat 41 using other suitable detachable connection methods, such as mortise and tenon joints, snap-fit ​​joints, threaded joints, or clamping and fixing methods to achieve a quick and detachable fixed connection.

[0045] In this embodiment, see Figure 4 , Figure 7 and Figure 10 As a preferred design, the upper seat 412 and the lower seat 411 are fixedly connected by bolts for easy assembly and disassembly. Preferably, multiple lower seats 411 of different models can be designed (in terms of the number, size, and layout of the stepped holes 414 in the riveting head). This allows for the rational setting of the riveting protrusions 14 according to the different lower armatures 1 and upper armatures 2 to be riveted, and the selection of a suitable lower seat 411 to be installed on the upper seat 412, thereby conveniently meeting the working needs under different conditions and providing greater flexibility and convenience.

[0046] In this embodiment, see Figure 7 , Figure 9 and Figure 10 As a preferred design, the lower end of the riveting head 42 is provided with a pointed head 422, which gradually decreases in size from top to bottom. The bottom end of the pointed head 422 forms a flat cutting edge, which allows the riveting protrusion 14 to extend and deform more effectively to both sides when pressed down. The pointed head 422 can also be set to a semi-circular or conical shape, etc., according to actual needs. Furthermore, the stepped rod cap 421 at the upper end of the riveting head 42 is non-circular in shape, and the upper hole of the corresponding stepped hole 414 of the riveting head is also non-circular. The cooperation of the two prevents the riveting head 42 from rotating in the stepped hole 414 of the riveting head, thereby stabilizing the angular direction of the pointed head 422.

[0047] In this embodiment, see Figure 8 , Figure 9and Figure 11 As a preferred design, the connecting seat 41 is provided with a vertically arranged guide hole 415. The guide hole 415 can be specifically set in the lower seat 411. The positioning block 51 is set in the guide hole 415 and can slide up and down. Through the gap fit between the guide hole 415 and the positioning block 51, the up and down movement of the positioning block 51 is stably guided. Furthermore, a limiting hole 416 is provided on the upper surface of the lower seat 411, which is larger than the guide hole 415. The guide hole 415 is located on the bottom surface of the limiting hole 416, forming a stepped shape. A limiting edge plate 511 is fixed on the upper end of the positioning block 51. The limiting edge plate 511 is located in the limiting hole 416 and can move up and down in the limiting hole 416. When the positioning block 51 is not subjected to an upward force, that is, before it contacts the upper armature 2 during the riveting downward movement, the elastic force of the elastic structure 52 causes the positioning block 51 to move down until the limiting edge plate 511 presses against the bottom surface of the limiting hole 416, preventing the positioning block 51 from falling out of the connecting seat 41. In other embodiments, other suitable existing limiting structures can also be provided in the connecting seat 41 to limit the positioning block 51 from falling out of the connecting seat 41.

[0048] In this embodiment, see Figure 8 , Figure 9 and Figure 11 As a preferred design, the elastic structure 52 includes a compression spring 521, which is located in the limiting hole 416. The upper and lower ends of the compression spring 521 are connected to the connecting seat 41 and the positioning block 51, respectively. When the positioning block 51 moves upward, the compression spring 521 is compressed, providing a downward elastic force to the positioning block 51. Furthermore, a spring receiving hole 513 is provided at the top of the positioning block 51, and the lower end of the compression spring 521 is located in the spring receiving hole 513, thereby stabilizing the position of the compression spring 521. The shape of the positioning block 51 can be set according to actual needs. When there are other parts on the top surface of the upper armature 2 that cannot be pressed down during pressing, a corresponding clearance hole 512 is provided at the bottom of the positioning block 51. When the positioning block 51 presses down on the upper armature 2, the parts are located in the clearance hole 512, thereby preventing the parts from being pressed down. In other embodiments, the elastic structure 52 may also adopt other suitable structures, such as tension springs, leaf springs, nitrogen springs or elastic airbags, or apply downward elastic force to the positioning block 51 directly or indirectly.

[0049] As can be seen from the above, the riveting fixture of this utility model has the following beneficial effects:

[0050] 1. The lower armature 1 is installed and stabilized in the positioning slot 31 of the positioning seat 3, and the fixing plate 15 and other parts at the bottom of the lower armature 1 are accommodated in the receiving slot 32, thereby ensuring the stability of the lower armature 1 during riveting. The upper armature 2 is first stably pressed onto the lower armature 1 by the positioning and clamping mechanism 5, and then the riveting head 42 presses down on the riveting part of the lower armature 1 (i.e., the riveting protrusion 14), causing it to deform and complete the riveting fit with the upper armature 2. The lower armature 1 itself serves as a support, realizing the die-free riveting of the lower armature 1 and the upper armature 2. The operation is stable and reliable. During riveting, the riveting head 42 contacts the riveting part of the lower armature 1, which facilitates avoiding other parts or structures. In addition, it can also realize multi-point riveting as needed, improving the connection accuracy and consistency.

[0051] 2. In the riveting mechanism 4, the riveting head 42 is pressed and installed in the stepped hole 414 of the riveting head by the upper seat 412, and the lower seat 411 is bolted to the upper seat 412 to realize the quick-change installation of the lower seat 411 and the riveting head 42. The riveting head 42 or the lower seat 411 can be set according to actual needs to meet the needs of different working conditions and make it flexible and convenient to use.

[0052] 3. By providing a receiving groove 32 in the positioning seat 3 and an avoidance hole 512 on the positioning block 51, other components (including but not limited to the fixing plate 15) on the lower armature 1 and upper armature 2 can be avoided during the riveting process, ensuring the smooth progress of the riveting work.

[0053] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0054] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A riveting fixture for a magnetic yoke structure, the magnetic yoke structure comprising a lower armature (1) and an upper armature (2), wherein a fixing plate (15) is provided at the bottom of the lower armature (1), characterized in that: The riveting fixture includes a positioning seat (3), a riveting mechanism (4), and a positioning and clamping mechanism (5). The positioning seat (3) has a positioning slot (31) for placing the lower armature (1) and a receiving slot (32) located below the positioning slot (31). The bottom of the positioning slot (31) has a support part (311) for supporting the lower armature (1) and a bottom connecting hole (312) connecting the positioning slot (31) and the receiving slot (32). The receiving slot (32) is used to accommodate the lower armature (1). The bottom fixing plate (15) of the positioning and pressing mechanism (5) includes a positioning block (51) located above the positioning cavity (31) and capable of moving up and down. The positioning block (51) is used to press down the upper armature (2) placed on the lower armature (1). The riveting mechanism (4) includes a riveting head (42) located above the positioning cavity (31) and capable of moving up and down. The riveting head (42) is used to squeeze the lower armature (1) part that is engaged with the upper armature (2) so that the lower armature (1) is riveted to the upper armature (2).

2. The riveting fixture for the magnetic yoke structure according to claim 1, characterized in that: The lower armature (1) is U-shaped and includes a bottom plate (11) and two side plates (12) on the left and right. The side wall of the positioning groove (31) is provided with two opposing limiting sides (313) that are respectively used to abut against the two side plates (12) of the lower armature (1).

3. The riveting fixture for the magnetic yoke structure according to claim 1, characterized in that: The riveting mechanism (4) further includes a connecting seat (41), and the riveting head (42) is fixed to the connecting seat (41); the positioning block (51) is installed on the connecting seat (41) and can move up and down relative to the connecting seat (41); the positioning and pressing mechanism (5) further includes an elastic structure (52) installed on the connecting seat (41), the elastic structure (52) acts on the positioning block (51) and provides a downward elastic force, and the lower end of the positioning block (51) is lower than the lower end of the riveting head (42) when it is not subjected to upward pressure.

4. The riveting fixture for the magnetic yoke structure according to claim 3, characterized in that: The connecting seat (41) includes a lower seat (411) and an upper seat (412). The top surface of the lower seat (411) is provided with a downward through-hole (414) for the rivet head. The top of the rivet head (42) is provided with a stepped rod cap (421). The lower end of the rivet head (42) passes through the rivet head stepped hole (414) and the stepped rod cap (421) is located in the rivet head stepped hole (414). The upper seat (412) is fixedly connected to the upper end face of the lower seat (411) and pressed against the stepped rod cap (421).

5. The riveting fixture for the magnetic yoke structure according to claim 4, characterized in that: The rivet head has multiple stepped holes (414) arranged in a rectangular or ring array.

6. The riveting fixture for the magnetic yoke structure according to claim 1 or 4, characterized in that: The lower end of the rivet head (42) is provided with a pointed head (422).

7. The riveting fixture for the magnetic yoke structure according to claim 3, characterized in that: The connecting seat (41) is provided with a vertically arranged guide hole (415), and the positioning block (51) is arranged in the guide hole (415) and can slide up and down.

8. The riveting fixture for the magnetic yoke structure according to claim 3, characterized in that: The elastic structure (52) includes a compression spring (521), the upper and lower ends of which abut against the connecting seat (41) and the positioning block (51) respectively.

9. The riveting fixture for the magnetic yoke structure according to claim 8, characterized in that: The upper end face of the positioning block (51) is provided with a spring receiving hole (513), and the lower end of the compression spring (521) is located in the spring receiving hole (513).

10. The riveting fixture for the magnetic yoke structure according to claim 1, characterized in that: The bottom end face of the positioning block (51) is provided with a clearance hole (512) for accommodating the components on the upper armature (2).

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