Auxiliary group hot melting riveting device of alternating current contactor

Abstract

The auxiliary group hot melting riveting device of the alternating current contactor comprises a profiling jig, a clamping cavity is formed in the middle of the profiling jig, and the inner walls of the two sides of the clamping cavity are respectively provided with a jacking ball used for jacking the outer side wall of a shell to be clamped. A spring ejector pin for assisting in ejecting the end cover and the shell is installed in the middle of the bottom end face of the clamping cavity, a liftable upper die assembly is erected over the profiling jig and comprises a fixing plate, an upper die plate, a lower die plate and an elastic ejection pin assembly penetrating through the upper die plate and the lower die plate, and an electric heating pipe is arranged between the upper die plate and the lower die plate. And the upper template is provided with independent and detachable riveting heads which are respectively in one-to-one correspondence with the riveting columns on the end cover. According to the utility model, the housing and the end cover are clamped and fixed through alignment of the profiling jig, and then riveting and fixing are carried out through the upper die assembly by utilizing the characteristics of deformation in a semi-molten state and cooling and reshaping of the plastic riveting column, so that the riveting efficiency is high, the precision is good, and the defective rate is low.

Description

Technical Field

[0001] The utility model relates to the hot melt riveting of a plastic housing of an AC contactor, and specifically to a hot melt riveting device for an auxiliary group of an AC contactor. Background Art

[0002] The auxiliary group is an extended product of the auxiliary contacts of an AC contactor product. The quality of its processing directly affects the reliability and stability of the extended functions of the contactor. The riveting of the auxiliary group is an important and key process in the production and processing of the auxiliary group.

[0003] For the welding of the auxiliary group housing (9) and the auxiliary group end cover (10), an ultrasonic welding machine is usually used for welding. One product needs to be welded 6 times to complete, with slow production efficiency, long processing cycle, and relatively high noise.

[0004] Moreover, its shape is irregular and the wall thickness at the welding position is thin, so it is very easy to have the phenomena of insecure welding or deformation, directly affecting the electrical and mechanical properties of the auxiliary group, resulting in mechanical jamming and non-conduction of contacts, poor accuracy, many defective products, affecting product quality, and not meeting the requirements of batch processing production. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the defects and deficiencies existing in the prior art, and provide a hot melt riveting device for an auxiliary group of an AC contactor. By using the characteristics of the plastic rivet column deforming in a semi-molten state, cooling and then reshaping, a processing device suitable for the hot melt riveting of the auxiliary group is designed and manufactured to solve the processing problems such as low efficiency, high noise, poor accuracy, and many defective products that occur in the conventional ultrasonic riveting of the auxiliary group during the production process.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A hot melt riveting device for an auxiliary group of an AC contactor includes a profiling jig for clamping the housing and end cover of the AC contactor to be riveted. A clamping cavity is arranged in the middle of the profiling jig. On both inner walls of the clamping cavity, there are respectively arranged bead tops for tightly pressing the outer wall of the housing to be clamped. In the middle of the bottom end surface of the clamping cavity, a spring ejector pin for assisting in ejecting the end cover and the housing is installed. An elevating upper die assembly is erected directly above the profiling jig. The upper die assembly includes a fixing plate, an upper template, a lower template, and an elastic ejector pin assembly penetrating through the upper template and the lower template. An electric heating tube is arranged between the upper template and the lower template. On the upper template, there are installed riveting heads that respectively correspond one-to-one and are independently detachable to the rivet columns on the end cover. A riveting head through hole is arranged on the lower template. The elastic ejector pin assembly is arranged in a dislocation manner with the riveting heads.

[0008] The peripheral side walls of the profiling jig are provided with channels for clamping the top beads. One end of the channel on the inner wall side is a stepped hole, in which the top beads are clamped. A top spring is clamped behind the top beads and is locked and fixed by a top head at the outer end of the channel.

[0009] The spring ejector pin includes a top column, and an integral connecting block is connected to the bottom end of the top column. A stepped through hole is provided at the center of the bottom end surface of the profiling jig. The top column is clamped into the upper end of the stepped through hole from above, and a pressing block is clamped on the upper end surface. A return spring for pressing against the connecting block is clamped into the bottom end of the stepped through hole.

[0010] The fixed plate is installed at the bottom end of the liftable driving member. The periphery of the fixed plate is connected to an upper template and a lower template through connecting columns. Positioning holes for clamping the elastic ejecting pin assembly are respectively provided on the upper template and the lower template. The elastic ejecting pin assembly includes a connecting rod at the upper end. The upper end of the connecting rod is fixedly connected to the fixed plate through a connecting sleeve one. The lower end of the connecting rod passes through the through holes of the upper template and the lower template through a heat insulation sleeve, and an ejecting pin is spring-guided and connected inside the bottom end of the connecting rod.

[0011] The upper template is provided with mounting holes for installing electric heating tubes, and the electric heating tubes (4) are controlled by a PID temperature control system.

[0012] The upper end of the riveting head is fixedly installed on the bottom end surface of the upper template through a mounting sleeve, and the lower end extends out of the through hole on the lower template. A forming cavity for melting and forming a mushroom-shaped riveting point is provided by a downward depression on the bottom end surface of the riveting head.

[0013] The material of the riveting head is Cr12MOV, and a Teflon treatment layer is sprayed on its bottom end surface and inside the forming cavity.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] (1) The structure of the present utility model is reasonably designed. The profiling jig is used to align and clamp the housing and the end cover, and then through the upper die assembly, using the characteristics of the plastic rivet column deforming in a semi-molten state, cooling and then reshaping, riveting and fixing is carried out. The riveting efficiency is high, the precision is good, and the defective rate is low. The riveting head on the template is set corresponding to the rivet column on the end cover, and the riveting is completely corresponding at one time, thus solving the processing problems such as low efficiency, high noise, poor precision, and many defective products that occur in the conventional ultrasonic riveting auxiliary group during the production process;

[0016] (2) The shape of the riveting point of the present utility model adopts a special mushroom head shape design. This design not only ensures that the appearance of the riveting point after riveting is smooth and beautiful, but also ensures the reliability of the product after riveting;

[0017] (3) The rivet heads of the utility model are designed to be independent and detachable. When one of the rivet heads is damaged or deformed, it can be replaced or adjusted separately without replacing all the rivet heads. This has the advantages of reducing production costs and debugging a certain rivet head in a targeted manner.

[0018] (4) The rivet head of the utility model is made of Cr12MOV and the end is treated with Teflon. This material selection design not only improves the hardness of the rivet head, prevents the rivet head from being hardened or deformed after heating, which directly affects the riveting quality, but also ensures that the rivet column material after hot melting will not have undesirable phenomena such as sticking or pulling, ensuring that the surface of the mushroom head is smooth and beautiful;

[0019] (5) The utility model adopts a PID temperature control system. This design ensures that the temperature of the auxiliary group is always at a relatively constant temperature during the riveting process. The dynamic temperature fluctuation range is 2~3°C, which ensures the consistency of the semi-molten state of the auxiliary group rivet column (13) and improves the riveting quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 is a schematic diagram of the structure of the shell;

[0022] Figure 3 is a schematic diagram of the structure of the end cover;

[0023] Figure 4 A cross-sectional view of the structure for the installation of the top bead;

[0024] Figure 5 A schematic diagram of a cross-sectional view of the spring ejector installation arrangement;

[0025] Figure 6 Cross-sectional view of the elastic ejector pin assembly.

[0026] Figure 7 It is a structural schematic diagram of the rivet head;

[0027] Figure 8 It is a schematic diagram of the structure of the shell and the cover plate being clamped into the contour jig.

[0028] Reference numerals:

[0029] 1. Fixed plate; 2. Connecting column; 3. Upper template; 4. Electric heating tube; 5. Lower template; 6. Riveting head; 61. Installation sleeve; 62. Forming cavity; 7. Elastic ejector pin assembly; 71. Connecting rod; 72. First connecting sleeve; 73. Heat insulation sleeve; 74. Spring; 75. Ejector pin; 8. Profiling jig; 9. Shell; 10. End cover; 11. Top bead; 12. Spring ejector pin; 121. Ejector column; 122. Connecting block; 123. Pressing block; 124. Step through hole; 125. Return spring; 14. Clamping cavity; 15. Channel; 16. Top spring. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] See the attached Figure 1-7 ;

[0032] An auxiliary group hot melt riveting device for an AC contactor includes a profiling jig 8 for clamping the shell 9 and end cover 10 of the AC contactor to be riveted. A clamping cavity 14 is provided in the middle of the profiling jig 8. On the inner walls of both sides of the clamping cavity 14, top beads 11 for tightly pressing the outer wall of the shell to be clamped are respectively provided. In the middle of the bottom end surface of the clamping cavity 14, a spring ejector pin 12 for assisting in ejecting the end cover and the shell is installed. A liftable upper die assembly is erected directly above the profiling jig 8. The upper die assembly includes a fixed plate 1, an upper template 3, a lower template 5, and an elastic ejector pin assembly 7 penetrating through the upper template 3 and the lower template 5. An electric heating tube 4 is provided between the upper template 3 and the lower template 5. On the upper template 3, riveting heads 6 corresponding to and independently detachable from the riveting posts on the end cover are installed respectively. The riveting heads are designed in an independent and detachable manner. When one of the riveting heads is damaged or deformed, a single riveting head can be replaced or adjusted separately, instead of replacing all the riveting heads. Therefore, it has the advantages of reducing production costs and targeted debugging of a single riveting head. A riveting head through hole is provided on the lower template 5, and the elastic ejector pin assembly 7 is arranged offset from the riveting head 6. This application utilizes the characteristics of the plastic riveting post 13 to undergo hot melt deformation, cooling, and re-shaping. Through the design and manufacture of special and dedicated hot melt riveting mechanisms and profiling jigs such as Figure 1 After the technological processes of pre-pressing, semi-melting, pressure maintaining, and cooling, a processing device for completing the hot melt riveting of 13 riveting posts 13 at one time.

[0033] Furthermore, a channel 15 for clamping the top bead 11 is formed on the peripheral side walls of the profiling jig 8. One end of the channel 15 located on the inner wall side is a stepped hole, in which the top bead 11 is clamped. A top spring 16 is clamped behind the top bead 11 and is locked and fixed by a top head 17 at the outer end of the channel 15.

[0034] Furthermore, the spring ejector pin 12 includes a top column 121, and an integral connecting block 122 is connected to the bottom end of the top column 121. A stepped through hole 124 is provided at the center of the bottom end surface of the profiling jig 8. The top column 121 is clamped into the upper end of the stepped through hole 124 from above, and a pressing block 123 is clamped by the upper end surface. A return spring 125 for tightly pressing the connecting block 122 is clamped into the bottom end of the stepped through hole.

[0035] Furthermore, the fixing plate 1 is installed at the bottom end of the liftable driving member. The periphery of the fixing plate 1 is connected to the upper template 3 and the lower template 5 through connecting columns 2. Positioning holes for clamping the elastic ejecting pin assembly 7 are respectively provided on the upper template 3 and the lower template 5. The elastic ejecting pin assembly 7 includes a connecting rod 71 at the upper end. The upper end of the connecting rod 71 is fixedly connected to the fixing plate 1 through a connecting sleeve 72. The lower end of the connecting rod 71 passes through the through holes of the upper template 3 and the lower template 5 through a heat insulation sleeve 73, and a top ejecting pin 75 is connected to the bottom end of the connecting rod 71 through a spring 74 for guiding. The upper template 3 is provided with an installation hole for installing the electric heating tube 4. The electric heating tube 4 is controlled by a PID temperature control system. Through the PID temperature control system, the temperature can always be maintained at a relatively constant temperature, and the dynamic temperature fluctuation range is 2-3°C, ensuring the consistency of the semi-molten state of the auxiliary group riveting post 13 and improving the riveting quality of the product.

[0036] Furthermore, the upper end of the riveting head 6 is fixedly installed on the bottom end surface of the upper template 3 through an installation sleeve 61, and the lower end extends out of the through hole on the lower template 5. A forming cavity 62 for melting and forming a mushroom head riveting point is provided on the bottom end surface of the riveting head 6 with an upward depression. The shape of the formed riveting point adopts a special mushroom head shape design. This design not only ensures that the appearance of the riveting point after riveting is smooth and beautiful, but also ensures the reliability of the product after riveting. The material of the riveting head 6 is Cr12MOV, and a Teflon treatment layer is sprayed on its bottom end surface and inside the forming cavity 62. This material selection design not only improves the hardness of the riveting head, prevents the hardness of the riveting head from decreasing or deforming after heating, which directly affects the riveting quality, but also ensures that there will be no bad phenomena such as sticking or tip pulling of the molten riveting post material, ensuring the smooth and beautiful surface of the mushroom head.

[0037] The structure of the above hot melt riveting mechanism is as Figure 1As shown in the figure, the hot melt riveting of the auxiliary group is completed in one go, and its preparation and processing process is as follows: The housing 9 of the auxiliary group and the end cover 10 of the auxiliary group are assembled to form an integral body that can be hot melt riveted. The end face of the housing 9 of the auxiliary group faces upward, and the end face of the end cover 10 of the auxiliary group faces downward, and they are placed in the profiling fixture 8; The profiling fixture 8 and the auxiliary group are in an interference fit. The inner side of the profiling fixture 8 is designed with positioning beads 11 to ensure accurate positioning of the auxiliary group. At the same time, a spring ejector pin 12 is designed directly below the profiling fixture 8 to ensure that the auxiliary group is ejected after the welding is completed; Two electric heating tubes 4 are used for heating. The heat passes through the upper template 3 and the lower template 5 in sequence and is transmitted to the end position of the riveting head 6. Through the PID temperature control system, the temperature at the end of the riveting head 6 is basically maintained at a constant riveting temperature; The hot melt riveting mechanism descends, and the elastic dowel pin 7 pre-compresses the end face of the housing 9 of the auxiliary group to ensure that it is in close contact with the end cover 10 of the auxiliary group. The hot melt riveting mechanism descends again, and the riveting head 6 melts the rivet column 13 until it reaches the set position, and a special mushroom head-shaped rivet point is formed at the end of the rivet column 13 as Figure 3 ; The hot melt riveting mechanism rises, the riveting head 6 leaves the rivet point position, and the elastic dowel pin 7 presses the housing 9 of the auxiliary group to ensure cooling and shaping of the rivet point position; The hot melt riveting mechanism rises again, the elastic dowel pin 7 retracts, and the hot melt riveting of the auxiliary group is completed. Since the auxiliary group is riveted with 13 rivet columns 13 formed in one go, the production cycle of riveting is shortened, and the production efficiency is improved. At the same time, a profiling fixture 8 with high precision and a special mushroom head-shaped rivet point as Figure 3 are adopted. The outer dimensions and appearance of the rivet points after riveting and the parameter performance of the auxiliary group can all be guaranteed within the range required by the drawings, improving the quality of the production of the auxiliary group.

[0038] Although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0039] Therefore, the above description is only a preferred embodiment of the present application and is not used to limit the scope of implementation of the present application; that is, all equivalent transformations made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A hot melt riveting device for an auxiliary group of an AC contactor, characterized in that: The invention comprises a profiling jig (8) for clamping an AC contactor housing (9) and an end cover (10) to be riveted, wherein a clamping cavity (14) is arranged in the middle of the profiling jig (8), and two inner walls of the clamping cavity (14) are respectively provided with ejector beads (11) for clamping against the outer wall of the housing to be clamped, and a spring ejector pin (12) for assisting in ejecting the end cover and the housing is installed in the middle of the bottom end surface of the clamping cavity (14), and a liftable upper die assembly is arranged directly above the profiling jig (8). The upper mold assembly comprises a fixed plate (1), an upper mold plate (3) and a lower mold plate (5), and an elastic ejector pin assembly (7) penetrating the upper mold plate (3) and the lower mold plate (5); an electric heating tube (4) is arranged between the upper mold plate (3) and the lower mold plate (5); rivet heads (6) which correspond to the rivet columns on the end cover and are independently detachable are installed on the upper mold plate (3); a rivet head through hole is arranged on the lower mold plate (5); and the elastic ejector pin assembly (7) and the rivet head (6) are arranged in a staggered manner.

2. The auxiliary group hot melt riveting device of the AC contactor according to claim 1, characterized in that: The side walls of the profiling jig (8) are provided with a channel (15) for clamping a top bead (11). One end of the channel (15) located on the inner wall side is a stepped hole, in which the top bead (11) is clamped. A top spring (16) is clamped behind the top bead (11) and is locked and fixed by a top head (17) at the outer end of the channel (15).

3. The auxiliary group hot melt riveting device of the AC contactor according to claim 1, characterized in that: The spring ejector pin (12) comprises an ejector column (121), the bottom end of the ejector column (121) is connected to an integral connecting block (122), a stepped through hole (124) is provided at the center position of the bottom end surface of the profiling jig (8), the ejector column (121) is inserted into the upper end of the stepped through hole (124) from above, and a pressure block (123) is mounted through the upper end surface, and a return spring (125) for tightening the connecting block (122) is inserted into the bottom end of the stepped through hole.

4. The auxiliary group hot melt riveting device of the AC contactor according to claim 1, characterized in that: The fixing plate (1) is mounted on the bottom end of the liftable driving member. The fixing plate (1) is connected to an upper mold plate (3) and a lower mold plate (5) via connecting columns (2) on all sides. Positioning holes for clamping an elastic ejector pin assembly (7) are respectively provided on the upper mold plate (3) and the lower mold plate (5). The elastic ejector pin assembly (7) comprises a connecting rod (71) at an upper end. The upper end of the connecting rod (71) is connected and fixed to the fixing plate (1) via a connecting sleeve (72). The lower end of the connecting rod (71) passes through the through holes of the upper mold plate (3) and the lower mold plate (5) via a heat insulating sleeve (73). An ejector pin (75) is connected to the bottom end of the connecting rod (71) via a spring (74) to guide the ejector pin.

5. The auxiliary group hot melt riveting device of the AC contactor according to claim 1, characterized in that: The upper template (3) is provided with a mounting hole for mounting an electric heating tube (4), and the electric heating tube (4) is controlled by a PID temperature control system.

6. The auxiliary group hot melt riveting device of the AC contactor according to claim 1, characterized in that: The upper end of the rivet head (6) is fixedly mounted on the bottom end surface of the upper mold plate (3) via a mounting sleeve (61), and the lower end extends out of a through hole on the lower mold plate (5). The bottom end surface of the rivet head (6) is provided with a molding cavity (62) recessed upward for melt molding of a mushroom head rivet point.

7. The auxiliary group hot melt riveting device of the AC contactor according to claim 6, characterized in that: The material of the rivet head (6) is Cr12MOV, and a Teflon treatment layer is sprayed on its bottom end surface and inside the molding cavity (62).

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