Punch ejector

Abstract

A punch demoulding device comprises a demoulding head, a gun nose is detachably arranged at the lower end of the demoulding head, a demoulding channel is arranged in the demoulding head, and a straight gun nose channel communicated with the demoulding channel is arranged in the gun nose. And the punch head is arranged in the demolding head, and the punch head can move up and down in the demolding channel and the gun nose straight channel. The heavy-load spring and the at least one light-load spring are sequentially arranged on the punch in a sleeving manner. And during demolding, the punch presses the heavy-load spring and the at least one light-load spring to apply acting force to the demolding head, so that the gun nose tightly presses a riveted material. The two springs with different elastic coefficients are matched with each other, so that enough acting force can be given to the gun nose to press a riveted material. And meanwhile, the demolding head and the gun nose are detachably connected, so that the demolding head and the gun nose can be quickly replaced when being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of riveting machines, and particularly relates to a punch demoulding device. Background Art

[0002] Riveting is a method of using the axial force of a punch to thicken the nail rod in the rivet hole of a part and form a nail head, so as to connect multiple parts.

[0003] The authorized announcement number CN218903364U discloses a cold heading riveting machine, which specifically discloses: including a workbench (100), the workbench (100) is provided with a bottom die (110), and the bottom die (110) is used for placing a first processing position (120) of a blank; a die (200), the die (200) is installed on the workbench (100) in a liftable manner, the die (200) is located above the bottom die (110), the die (200) is provided with a first through hole (210), the die (200) is provided with an ejection mechanism (220) that can move relatively along the axial direction of the first through hole (210), one end of the ejection mechanism (220) close to the bottom die (110) is provided with a cavity surface, and the first through hole (210) and the cavity surface cooperate to form a cavity, and the first through hole (210) matches the shape and size of the first processing position (120); wherein, an elastic element (221) is provided at one end of the ejection mechanism (220) far from the bottom die (110), the elastic element (221) contracts as the ejection mechanism (220) presses down the blank, and the ejection mechanism (220) elastically resets and ejects the processed product through the elastic element (221).

[0004] The above comparative document completes demoulding by setting an elastic element 221 to cooperate with the ejection mechanism 220 to eject the product, thereby reducing the later processing time of the product and solving the problem of difficult demoulding of the product, thereby improving the production efficiency of the product. However, there are the following problems: there is only one elastic element, which cannot ensure that enough force can be provided to cooperate with the ejection mechanism to extrude the product blank and fill the cavity of the object. Therefore, it is necessary to design a mechanism with a large enough demoulding force to fill the cavity of the object with the product blank. Summary of the Utility Model

[0005] Aiming at the problems existing in the above prior art, the purpose of the present utility model is to provide a punch demoulding device, which can provide enough demoulding force to ensure that after the object punches through the riveted material, the riveted material is tightly combined with the object; at the same time, when a component is damaged, it can be quickly replaced.

[0006] In order to achieve the above purpose, the technical solution of the present utility model is to provide a punch demoulding device, including:

[0007] A demolding head, a nose is detachably arranged at the lower end of the demolding head, a demolding channel is arranged inside the demolding head, and a nose straight channel communicating with the demolding channel is arranged inside the nose; a punch, the punch is arranged inside the demolding head, and the punch can move up and down in the demolding channel and the nose straight channel; a heavy-duty spring and at least one light-duty spring, the heavy-duty spring and the light-duty spring are sequentially sleeved on the punch; during demolding, by squeezing the heavy-duty spring and at least one of the light-duty springs, a force is applied to the demolding head to make the nose tightly press the riveted material.

[0008] Further, the demolding head includes a lower demolding head part and an upper demolding head part; the demolding channel sequentially includes a first demolding channel, a second demolding channel, and a third demolding channel from bottom to top, and the diameters of the first demolding channel, the second demolding channel, and the third demolding channel increase in sequence.

[0009] Further, the elastic coefficient of the heavy-duty spring is greater than that of the light-duty spring.

[0010] Further, the light-duty spring is sleeved on one end of the punch close to the nose, and the heavy-duty spring is sleeved on one end of the punch far from the nose.

[0011] Further, it further includes a heavy-duty spring pressing block and a light-duty spring pressing block. The heavy-duty spring pressing block is arranged on the upper part of the punch, and the upper end of the heavy-duty spring abuts against the heavy-duty spring pressing block; the light-duty spring pressing block is sleeved on the middle part of the punch, and the light-duty spring pressing block is located between the lower end of the heavy-duty spring and the upper end of the light-duty spring.

[0012] Further, a first concave part and a second concave part are respectively arranged at the upper end and the lower end of the light-duty spring pressing block, a first through hole is arranged in the middle part of the light-duty spring pressing block, and the first concave part communicates with the second concave part through the first through hole.

[0013] Further, a second through hole is arranged in the middle part of the light-duty spring pressing block. Taking the second through hole as the center, a plurality of groove-like structures are arranged on the lower end face of the light-duty spring pressing block, and the upper end of the light-duty spring is arranged in the groove-like structures.

[0014] Further, a third through hole is arranged in the middle part of the light-duty spring pressing block.

[0015] Further, a blind hole is arranged at the lower end of the heavy-duty spring pressing block, and the upper part of the punch is arranged in the blind hole.

[0016] Further, a third recessed portion and a fourth recessed portion are respectively provided at the upper end and the lower end of the heavy-duty spring pressing block. A fourth through hole is provided in the middle of the heavy-duty spring pressing block. The third recessed portion communicates with the fourth recessed portion through the fourth through hole. The punch is disposed in the fourth through hole. The upper end of the punch is disposed in the third recessed portion, and the upper end of the heavy-duty spring abuts against the fourth recessed portion.

[0017] Further, an elastic limiting assembly is further included. The elastic limiting assembly is disposed in the straight channel of the nose of the gun.

[0018] Further, a driving device is further included. A first cavity is provided at the lower end of the driving piston rod of the driving device. The upper end of the demoulding head is disposed in the first cavity. When the driving device operates, the bottom wall of the first cavity abuts against the upper part of the punch to drive the demoulding head and the punch to move downward.

[0019] Further, a demoulding head pressing plate is further included. The demoulding head pressing plate is sleeved on the demoulding head, and the demoulding head pressing plate is detachably connected to the lower end of the driving piston rod.

[0020] Further, a guiding structure is disposed on the outer wall of the demoulding head along the central axis direction. The demoulding head pressing plate is sleeved on the guiding structure. Under the action of the driving piston rod, the demoulding head pressing plate moves up and down in the guiding structure.

[0021] Further, the guiding structure is in the shape of a keyway or a milled flat surface.

[0022] Further, a clamping groove is horizontally disposed on the side wall of the lower part of the demoulding head. A plugging cavity is provided at the upper end of the nose of the gun. A clamping through hole is horizontally disposed on the side wall of the upper end of the nose of the gun. The clamping through hole penetrates through the plugging cavity. The lower part of the demoulding head is inserted into the plugging cavity. A clamping member is inserted into the clamping through hole. Both ends of the clamping member are located in the clamping through hole, and the middle part of the clamping member is located in the clamping groove.

[0023] Further, an installation portion is provided at the upper end of the nose of the gun. A plurality of first installation holes are provided on the installation portion. A plurality of second installation holes corresponding to the plurality of first installation holes are provided on the lower end face of the demoulding head. One end of an installation member passes through the first installation hole and is disposed in the second installation hole to install the nose of the gun on the lower end of the demoulding head.

[0024] Further, at least one positioning recessed portion is provided on the upper surface of the installation portion. The lower end of the light-duty spring is disposed in the positioning recessed portion.

[0025] Further, when observed from above, the projection of the gun nose is located in the middle of the projection of the mounting portion, and several of the first mounting holes are distributed around the projection of the gun nose as the center.

[0026] Further, a plugging protrusion is provided at the middle position of the lower end face of the demolding head, and a plugging recess is formed between the upper end face of the gun nose and the inner wall of the mounting portion. When the lower end of the demolding head is mounted with the upper end of the gun nose, the plugging protrusion is inserted into the plugging recess.

[0027] The beneficial effects of the present utility model are as follows: A heavy-duty spring and at least one light-duty spring are sequentially sleeved on the punch. When the punch presses down, the heavy-duty spring and the light-duty spring will be gradually compressed, and a relatively large pressure will be generated on the demolding head, so that the gun nose connected to the demolding head can tightly press the riveted material; when the punch punches an object into the riveted material, based on the metal fluidity of the riveted material, the riveted material can fill the side wall space of the object, so that the riveted material can be tightly combined with the object, thus completing the entire riveting work. Since the demolding head and the gun nose are set as a detachable structure, when the demolding head or the gun nose fails or is damaged, it can be quickly replaced or repaired. Description of the Drawings

[0028] Figure 1 is a schematic plan view of an embodiment of the present utility model;

[0029] Figure 2 is Figure 1 a sectional view of;

[0030] Figure 3 is Figure 1 a disassembled structure view of;

[0031] Figure 4 is Figure 1 a three-dimensional structure view of the demolding head pressing plate in;

[0032] Figure 5 is Figure 1 a disassembled structure view of the demolding head and the gun nose in;

[0033] Figure 6 is Figure 5 a sectional view of;

[0034] Figure 7 is Figure 5 a three-dimensional structure view of the gun nose of;

[0035] Figure 8 is Figure 1 a three-dimensional structure view of the demolding head, the gun nose and the punch in;

[0036] Figure 9 isFigure 8 Cross-sectional schematic view;

[0037] Figure 10 is Figure 8 Schematic three-dimensional structure of the light-load spring pressing block in

[0038] Figure 11 is Figure 10 Cross-sectional schematic view;

[0039] Figure 12 is Figure 8 Schematic three-dimensional structure of the heavy-load spring pressing block in

[0040] Figure 13 is Figure 12 Cross-sectional schematic view;

[0041] Figure 14 Schematic three-dimensional structure of the demolding head, gun nose and punch of another embodiment of the present utility model;

[0042] Figure 15 is Figure 14 Exploded structure schematic view;

[0043] Figure 16 is Figure 14 Schematic three-dimensional structure of the gun nose and the mounting part in

[0044] Figure 17 Schematic plan view of the demolding head, gun nose and punch of the third embodiment of the present utility model;

[0045] Figure 18 is Figure 17 Cross-sectional schematic view;

[0046] Figure 19 is Figure 17 Schematic three-dimensional structure of the light-load spring pressing block in

[0047] Figure 20 Schematic three-dimensional structure of the demolding head, gun nose and punch of the fourth embodiment of the present utility model.

[0048] Reference numerals

[0049] 200, First object; 500, Punch demolding device;

[0050] 54, Magnetic attraction structure;

[0051] 6. Demolding head; 61. Demolding channel; 611. First demolding channel; 612. Second demolding channel; 613. Third demolding channel; 62. Lower part of demolding head; 63. Upper part of demolding head; 64. Annular step structure; 65. Protrusion structure; 651. Card slot; 652. Clamping part; 66. Driving piston rod; 661. First cavity; 662. Bottom wall; 663. Spacer block; 67. Demolding head pressure plate; 671. Pressure plate protrusion; 68. Guiding structure; 691. Insertion protrusion part; 692. Second mounting hole; 693. Spring avoidance through hole;

[0052] 7. Gun nose; 71. Straight channel of gun nose; 711. Limiting part mounting hole; 72. Side channel of gun nose; 721. Engaging part; 73. Elastic limiting component; 731. Limiting part; 732. Tensioning ring; 74. Mounting part; 741. First mounting hole; 742. Positioning depression; 75. Insertion cavity; 76. Clamping through hole; 77. Insertion depression;

[0053] 8. Punch; 81. Lower part of punch; 82. Middle part of punch; 83. Upper part of punch; 84. First transition part; 85. Second transition part;

[0054] 91. Heavy-duty spring; 92. Light-duty spring; 93. Heavy-duty spring pressing block; 931. Third depression; 932. Fourth depression; 933. Fourth through hole; 934. Blind hole; 94. Light-duty spring pressing block; 941. First depression; 942. Second depression; 943. Exhaust hole; 944. Convex block; 945. Groove structure; 946. First through hole; 947. Second through hole; 948. Third through hole. Detailed implementation mode

[0055] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the position or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.

[0056] In addition, if there are terms "first" and "second", they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise specifically defined.

[0057] In the present utility model, unless otherwise clearly specified and defined, terms such as "assembled", "connected", and "joined" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may also be a mechanical connection; it can be directly connected, or connected through an intermediate medium, and can be internally connected and communicated between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0058] The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. The following description is merely exemplary and does not limit the protection scope of the utility model.

[0059] As Figure 1-13 shown, a punch demoulding device, the punch demoulding device 500 includes a demoulding head 6, a muzzle 7 is detachably arranged at the lower end of the demoulding head 6, a demoulding channel 61 is arranged inside the demoulding head 6, and a muzzle straight channel 71 communicating with the demoulding channel 61 is arranged inside the muzzle 7; a punch 8, the punch 8 is arranged inside the demoulding head 6, and the punch 8 can move up and down in the demoulding channel 61 and the muzzle straight channel 71; a heavy-duty spring 91 and at least one light-duty spring 92, the heavy-duty spring 91 and the light-duty spring 92 are sequentially sleeved on the punch 8; during demoulding, by squeezing the heavy-duty spring 91 and at least one light-duty spring 92, a force is applied to the demoulding head 6 to press the muzzle 7 tightly against the riveted material.

[0060] Please refer to Figure 5 , in this embodiment, the demoulding head 6 is divided into a lower demoulding head 62 and an upper demoulding head 63. The upper demoulding head 63 is cylindrical, and the two side walls of the lower demoulding head 62 are designed with an arc shape that is wider at the top and narrower at the bottom. This design can provide a smooth connection between the lower demoulding head 62 and the upper demoulding head 63. A convex structure 65 protrudes from the outside of the lower demoulding head 62. The convex structure 65 is a hollow column, and the side wall of the convex structure 65 is further recessed to form two laterally arranged card slots 651 that are centrosymmetric and arc-shaped. At least one guiding structure 68 is recessed along the central axis direction on the outer wall of the demoulding head 6, and the guiding structure 68 is in the shape of a keyway.

[0061] Specifically, in this embodiment, two guiding structures 68 are provided, and the two guiding structures 68 are symmetrically arranged on the outer wall of the demoulding head 6.

[0062] Please refer to Figure 6, Further, the demolding channel 61 inside the demolding head 6 is divided into a first demolding channel 611, a second demolding channel 612, and a third demolding channel 613 that are sequentially connected. Specifically, the demolding channel 61 located at the lower part 62 of the demolding head is the first demolding channel 611. An annular step structure 64 is provided in the demolding channel 61 of the upper part 63 of the demolding head. The annular step structure 64 divides the demolding channel 61 of the upper part 63 of the demolding head into a second demolding channel 612 and a third demolding channel 613. The diameters of the first demolding channel 611, the second demolding channel 612, and the third demolding channel 613 increase in sequence. Specifically: the diameter of the third demolding channel 613 is approximately 1.20 times the diameter of the second demolding channel 612, and the diameter of the second demolding channel 612 is approximately 3.34 times the diameter of the first demolding channel 611. This is only for illustration, and this embodiment is not limited thereto.

[0063] It should be noted here that, in this embodiment, the annular step structure 64 is specifically formed by the inner wall of the demolding head 6 being concave. Of course, the annular step structure 64 can also be a separating structure of other structures, as long as it can separate the demolding channel 61 of the upper part 63 of the demolding head into two parts with inconsistent diameters, and this is not limited here.

[0064] In this embodiment, the nose 7 is provided in a cylindrical shape. A nose side channel 72 is provided through the upper end of the nose 7. The nose side channel 72 communicates with the nose straight channel 71. The function of the nose side channel 72 is to load the first object 200.

[0065] Further, please refer to Figure 5 , When observing from the opening of the nose side channel 72, engaging portions 721 are provided on both sides of the nose side channel 72. The function of providing the two engaging portions 721 is as follows: One end (this structure is not drawn) of the first pressing block and the second pressing block of the rivet conveyor near the third path outlet can be inserted into the nose side channel 72 until the first pressing block and the second pressing block respectively abut against the two engaging portions 721. At this time, the third path outlet of the rivet conveyor can just communicate with the nose straight channel 71, so that the first object 200 can enter the nose straight channel 71 from the rivet conveyor.

[0066] Please refer to Figure 6 and Figure 9 , In this embodiment, when the angle at which the punch demolding device 500 is placed causes the predetermined movement direction of the first object 200 to be inconsistent with the actual movement direction of the first object 200, the first object 200 will flow backward. Therefore, the punch demolding device 500 further includes an elastic limiting component 73 that can prevent the first object 200 from flowing backward. The elastic limiting component 73 is provided in the nose straight channel 71 to prevent the first object 200 from being blown out of the nose.

[0067] Specifically, the elastic limiting assembly 73 includes a limiting member 731 and a tensioning ring 732. In the present embodiment, there are four limiting members 731, and there may also be two, three, five, etc. This is just an example, and the present embodiment is not limited thereto. From the vertical cross section of each limiting member 731, the tail of each limiting member 731 is rectangular, and the head of the limiting member 731 is semi-elliptical (of course, the limiting member 731 may also be a steel ball or a ball plunger). Four limiting member mounting holes 711 are provided through the lower end of the gun nose 7, and the four limiting member mounting holes 711 are spaced at the same distance. The four limiting member mounting holes 711 are located on the same plane, and the cross section of each limiting member mounting hole 711 in the vertical direction is convex.

[0068] The stopper 731 is arranged in the stopper installation hole 711, and the head of the stopper 731 can extend into the gun nose straight channel 71. When the step portion of the tail of the stopper 731 abuts against the step portion of the stopper installation hole 711, the stopper 731 can be arranged in the stopper installation hole 711 by using a tensioning ring 732 to be sleeved on the tail of the stopper 731.

[0069] More specifically, from the vertical cross section of the first object 200, the middle position of the first object 200 is concave (arc-shaped), and the bending angle of the head of the stopper 731 is basically consistent with the bending degree from the middle position to the upper end (or the bending degree from the middle position to the lower end) of the first object 200. When the heads of the two stoppers 731 are simultaneously inserted into the waist position of the first object 200, and there is no external force that is sufficient to open the tension ring 732, the elastic force of the tension ring 732 can enable the head of the stopper 731 to clamp the first object 200. Until the punch 8 continues to push the first object 200 to open the tension ring 732, the first object 200 can break free from the engagement of the stopper 731 and move to the exit of the nose straight channel 71. Then the punch 8 returns to its original position, and the elastic force of the tension ring 732 causes the limiting member 731 to extend into the nose straight channel 71 again, preparing for the engagement of the next first object 200 .

[0070] Please refer to Figure 9, in this embodiment, in order to further improve the anti-backflow ability of the punch ejector 500, the punch ejector 500 further includes a magnetic attraction structure 54, and the magnetic attraction structure 54 is disposed in the nose straight channel 71. Specifically, in this embodiment, there are two magnetic attraction structures 54, and the two magnetic attraction structures 54 are located in the same vertical plane. One of the magnetic attraction structures 54 is disposed facing the nose side channel 72 (that is, in the same plane as the nose side channel 72), and the other magnetic attraction structure 54 is disposed above the limiting member 731 at a certain distance. When the first object 200 enters the nose straight channel 71 from the nose side channel 72, the magnetic attraction structure 54 generates a magnetic attraction force to hold the first object 200 and prevent it from flowing back. In this embodiment, the magnetic attraction structure 54 is set as a magnet, and the advantage is that in addition to being able to generate a strong magnetic field, it also has a low cost.

[0071] Please refer to Figures 5 to 7 , in this embodiment, the demolding head 6 and the nose 7 are detachably connected, and the specific connection method is as follows: a plugging cavity 75 is provided at the upper end of the nose 7. At the upper end of the nose 7, two clamping through holes 76 are provided in a transverse and penetrating manner, and each clamping through hole 76 is communicated with a clamping groove 651 provided on the protruding structure 65.

[0072] Insert the protruding structure 65 of the lower part 62 of the demolding head into the plugging cavity 75, and use two clamping members 652 to respectively insert into the two clamping through holes 76 until the middle part of the clamping member 652 is clamped on the arc surface of the clamping groove 651, then the nose 7 can be installed on the demolding head 6. At this time, the nose straight channel 71 is communicated with the first demolding channel 611. When it is necessary to disassemble the demolding head 6 and the nose 7, only the clamping member 652 needs to be taken out. The advantage of this detachable connection method is that when the demolding head 6 or the nose 7 fails or is damaged, it can be quickly replaced or repaired without replacing the entire punch ejector 500, reducing the downtime of the punch ejector 500, thereby reducing the maintenance and operation costs. This flexible adjustment method can meet the needs of different customer application scenarios and improve the market competitiveness of the product. In this embodiment, the clamping member 652 is a cylindrical pin.

[0073] Please refer to Figure 3 , in this embodiment, the length of the punch 8 is greater than the sum of the lengths of the demolding head 6 and the nose 7. The punch 8 is divided into a lower part 81 of the punch, a middle part 82 of the punch, and an upper part 83 of the punch. The lower part 81 of the punch, the middle part 82 of the punch, and the upper part 83 of the punch are all designed in a cylindrical shape, and the length ratio of the lower part 81 of the punch, the middle part 82 of the punch, and the upper part 83 of the punch is approximately 8:17:1 ， This is only an example, and this embodiment is not limited thereto.

[0074] A first transition portion 84 is provided between the lower part 81 and the middle part 82 of the punch, and a second transition portion 85 is provided between the middle part 82 and the upper part 83 of the punch. Both the first transition portion 84 and the second transition portion 85 are arranged in an arc shape with a wider upper part and a narrower lower part, but the lengths of the two side edges of the first transition portion 84 are much greater than the lengths of the two side edges of the second transition portion 85. Therefore, visually, the connection between the lower part 81 and the middle part 82 of the punch looks smoother than the connection between the middle part 82 and the upper part 83 of the punch. This design can provide a smooth connection for the lower part 81, the middle part 82 and the upper part 83 of the punch.

[0075] The diameter of the lower part 81 of the punch is basically the same as the diameter of the straight channel 71 of the nose, and the length of the lower part 81 of the punch is greater than the length of the straight channel 71 of the nose. Therefore, the punch 8 can surely extend into the straight channel 71 of the nose and push the first object 200 out of the straight channel 71 of the nose.

[0076] In this embodiment, the number of active coils of the light load spring 92 is greater than the number of active coils of the heavy load spring 91. The central diameter of the light load spring 92 is equal to the central diameter of the heavy load spring 91 (the central diameter of the light load spring 92 can also be greater than the central diameter of the heavy load spring 91). The wire diameter of the light load spring 92 is equal to the wire diameter of the heavy load spring 91 (the wire diameter of the light load spring 92 can also be less than the wire diameter of the heavy load spring 91). According to the elastic coefficient formula of the compression spring it can be known that where G is the rigidity modulus of the wire material used to make the spring, d is the wire diameter of the wire material used to make the spring, Nc is the number of active coils of the spring, and Dm is the central diameter of the spring. Combining the data of the above springs, it can be obtained that the elastic coefficient of the heavy load spring 91 is greater than the elastic coefficient of the light load spring 92 (that is, the elastic force of the heavy load spring 91 is greater, and the compression amount of the light load spring 92 is greater). When the punch 8 starts to move towards the straight channel 71 of the nose, since the elastic coefficient (stiffness) of the light load spring 92 is smaller and the elastic coefficient (stiffness) of the heavy load spring 91 is larger, the light load spring 92 will be more easily compressed and the heavy load spring 91 will be more difficult to be compressed.

[0077] Specifically, the light load spring 92 is sleeved on one end of the punch 8 close to the nose 7, and the heavy load spring 91 is sleeved on one end of the punch 8 far from the nose 7. The central diameters of the light load spring 92 and the heavy load spring 91 are basically the same as the diameter of the second demolding channel 612, that is, the central diameters of the light load spring 92 and the heavy load spring 91 are much larger than the diameter of the first demolding channel 611. Therefore, when the punch 8 moves towards the straight channel 71 of the nose, the light load spring 92 and the heavy load spring 91 will be compressed, and the above two can be compressed to the end of the second demolding channel 612 at most, and generate a force on the demolding head 6, so that the nose 7 connected to the demolding head 6 can tightly press the riveted material.

[0078] Generally speaking, when the punch 8 moves towards the straight channel 71 of the nose piece, the light-load spring 92 provides a relatively small compression force to the nose piece 7 at the initial stage. The nose piece 7 slides or is misaligned during the positioning stage to ensure that the first object 200 can be accurately positioned on the material to be riveted and pre-fixed. When a greater compression force is required to further compress the material to be riveted, the heavy-load spring 91 provides a greater compression force to ensure that the nose piece 7 can tightly squeeze the material to be riveted. This way of applying graded pressure can ensure the accuracy and reliability of the riveting process. The combined use of the light-load spring 92 and the heavy-load spring 91 can also reduce the working load of each spring, reduce the fatigue and wear of a single spring, and extend the service life of the punch ejector 500. In addition, during the operation of the punch ejector 500, the light-load spring 92 can effectively slow down the initial impact force, reduce the vibration and noise during the operation of the punch ejector. The heavy-load spring 91 provides a stable pressure in the later stage, further reducing the vibration and noise levels.

[0079] Please refer to Figures 9-13 , in this embodiment, the punch ejector 500 further includes a heavy-load spring pressing block 93 and a light-load spring pressing block 94. The size of the heavy-load spring pressing block 93 is larger than that of the light-load spring pressing block 94. The heavy-load spring pressing block 93 is sleeved on the upper part 83 of the punch, and the upper end of the heavy-load spring 91 abuts against the heavy-load spring pressing block 93. The light-load spring pressing block 94 is sleeved on the middle part 82 of the punch and is located between the upper end of the light-load spring 92 and the lower end of the heavy-load spring 91.

[0080] A first recess 941 and a second recess 942 are respectively arranged at the upper end and the lower end of the light-load spring pressing block 94, and a first through hole 946 is arranged in the middle. The first recess 941 communicates with the second recess 942 through the first through hole 946. The lower end of the heavy-load spring 91 is arranged in the first recess 941, and the upper end of the light-load spring 92 is arranged in the second recess 942.

[0081] Specifically, a plurality of through exhaust holes 943 are arranged around the through hole of the light-load spring pressing block 94. In this embodiment, the number of the exhaust holes 943 is 4, and the four exhaust holes 943 are arranged at a predetermined same distance. The functions of arranging the above exhaust holes 943 are as follows: on the one hand, it can release the pressure generated by compressing the light-load spring 92 or discharge air, which is particularly important for the continuous reciprocating movement of the punch 8 of the punch ejector 500, and can improve the stability and safety of the entire punch ejector 500. On the other hand, arranging the exhaust holes 943 can reduce the overall mass of the light-load spring pressing block 94 to reduce its inertia, improve the rapid response ability of the punch 8, and improve the dynamic performance of the entire punch ejector 500.

[0082] A third recess 931 and a fourth recess 932 are respectively provided at the upper end and the lower end of the heavy-duty spring pressing block 93, and the diameter of the third recess 931 is smaller than that of the fourth recess 932. A fourth through hole 933 is provided in the middle of the heavy-duty spring pressing block 93, and the third recess 931 communicates with the fourth recess 932 through the fourth through hole 933. The punch 8 is inserted into the fourth through hole 933, the upper part 83 of the punch is arranged in the third recess 931, and the upper end of the heavy-duty spring 91 is arranged in the fourth recess 932.

[0083] Please refer to Figure 9 , specifically, the size of the light-duty spring pressing block 94 is basically the same as that of the annular step structure 64. Therefore, the light-duty spring pressing block 94 can at most abut against the annular step structure 64 of the demoulding channel 61 and cannot enter the second demoulding channel 612, and the light-duty spring pressing block 94 cannot continue to compress the light-duty spring 92. At this time, the compression amount of the light-duty spring 92 is the maximum value. The size of the heavy-duty spring pressing block 93 is the same as the size of the end face of the demoulding head 6 away from the nose 7 (i.e., the upper end face of the demoulding head 6). Therefore, when the punch 8 pushes the heavy-duty spring pressing block 93 to move, the heavy-duty spring pressing block 93 will finally abut against the end face of the demoulding head 6 away from the nose 7, and the heavy-duty spring pressing block 93 cannot continue to compress the heavy-duty spring 91. At this time, the compression amount of the heavy-duty spring 91 reaches the maximum value.

[0084] Generally speaking, the light-duty spring pressing block 94 and the heavy-duty spring pressing block 93 are used to separate the light-duty spring 92 and the heavy-duty spring 91. There is no interference or contact between the light-duty spring 92 and the heavy-duty spring 91, and the two can deform freely within their respective deformation ranges, ensuring the normal operation of the punch demoulding device 500.

[0085] Please refer to Figure 2 , in this embodiment, the punch demoulding device 500 further includes a driving device (not marked in the figure). A first cavity 661 is provided at the lower end of the driving piston rod 66 of the driving device, and the upper end of the demoulding head 6 extends into the first cavity 661 (at this time, the heavy-duty spring pressing block 93, the punch 8, the heavy-duty spring 91, the light-duty spring pressing block 94 and the light-duty spring 92 are also correspondingly arranged in the first cavity 661). A bottom wall 662 is provided in the first cavity 661. When the driving piston rod 66 moves, the bottom wall 662 can abut against the upper part 83 of the punch and push the punch 8 in the direction of the demoulding channel 61 and the nose straight channel 71. Specifically, a cushion block 663 is further provided between the bottom wall 662 and the upper part 83 of the punch to prevent the driving piston rod 66 from continuously moving back and forth and hitting the upper part 83 of the punch, thereby causing wear of the upper part 83 of the punch.

[0086] It further includes a demolding head pressing plate 67, which is a hollow annular structure, and the inner diameter of the demolding head pressing plate 67 is basically the same as the outer diameter of the demolding head 6. The demolding head pressing plate 67 is sleeved on the demolding head 6 and is detachably connected to the lower end of the driving piston rod 66.

[0087] Under the action of the driving piston rod 66, the demolding head pressing plate 67 can move up and down on the outer wall of the demolding head 6. Specifically, at least one pressing plate protrusion 671 is provided on the inner ring of the demolding head pressing plate 67 (please refer to Figure 4 ). The size of the pressing plate protrusion 671 matches the size of the guiding structure 68. Therefore, under the drive of the driving piston rod 66, the pressing plate protrusion 671 can move up and down in the guiding structure 68. In this embodiment, two pressing plate protrusions 671 are provided.

[0088] Specifically, the guiding structure 68 is longer than the nose straight channel 71. Therefore, when the driving piston rod 66 drives the pressing plate protrusion 671 to move from the starting point of the guiding structure 68 to the other end of the guiding structure 68 until it reaches the predetermined end point, the driving piston rod 66 will surely be able to push the punch 8 to push the first object 200 to the outlet of the nose straight channel 71.

[0089] When the driving piston rod 66 presses down and drives the punch 8 to move a certain distance, the heavy-duty spring block 93 will abut against the upper end face of the demolding head 6, and the light-duty spring block 94 will abut against the annular step structure 64. At this time, both the heavy-duty spring 91 and the light-duty spring 92 reach the maximum compression amount. Therefore, when the driving piston rod 66 further presses down, the bottom wall 662 of the driving piston rod 66, the cushion block 663, the punch 8 and the heavy-duty spring block 93 will abut against each other, which is equivalent to the driving piston rod 66 directly applying a force to the demolding head 6, so that the nose 7 further tightly presses the material to be riveted.

[0090] The working principle of the present invention is introduced below for a better understanding of the present invention:

[0091] It should be noted that in actual riveting work, a die assembly (not marked) will be provided directly below the punch demolder 500 to cooperate with the punch demolder 500 for riveting work, and the present invention is no exception.

[0092] In the first step, the first object 200 enters the nose straight channel 71 from the nose side channel 72, and the magnetic attraction structure 54 attracts the first object 200 to prevent it from flowing back.

[0093] In the second step, the piston rod 66 is driven to start moving. The bottom wall 662 abuts against the upper part of the punch 83 and drives the punch 8 to move towards the nose straight channel 71. After the punch 8 moves a certain distance in the nose straight channel 71, it starts to push the first object 200 onto the material to be riveted. During this process, the light-load spring block 94 squeezes the light-load spring 92 until the light-load spring block 94 abuts against the annular step structure 64. At this time, the light-load spring 92 is compressed to the limit. The heavy-load spring 91 is compressed to a certain length by the heavy-load spring block 93. The combined compression force of the light-load spring 92 and the heavy-load spring 91 acts on the demolding head 6, and the nose 7 presses the material to be riveted tightly against the die assembly.

[0094] In the third step, the punch 8 is further pressed down, and the material to be riveted starts to tear. At this time, the heavy-load spring 91 is further compressed, and the combined compression force of the light-load spring 92 and the heavy-load spring 91 acting on the demolding head 6 further increases, and the pressure of the demolding head 6 on the material to be riveted also increases.

[0095] In the fourth step, then the piston rod 66 is driven to continue pressing down. The punch 8 continues to apply pressure to the first object 200, causing the first object 200 to penetrate into the material to be riveted. At this time, the heavy-load spring block 93 abuts against the demolding head 6, and the heavy-load spring 91 is compressed to the limit. At this time, the bottom wall 662, the upper part of the punch 83, the heavy-load spring block 93, and the demolding head 6 are in a state of mutual abutment.

[0096] In the fifth step, the piston rod 66 is driven to push the mutually abutting components further down. At this time, the piston rod 66 is equivalent to directly acting on the nose 7. Generally speaking, at this time, the punch demolding device 500 takes the downward pressure of the piston rod 66 as the main acting force, the compression force of the light-load spring 92 and the heavy-load spring 91 acting on the demolding head 6 as the first indirect acting force, the upward supporting force of the die assembly on the material to be riveted as the second indirect acting force, and the metal flow property of the material to be riveted itself. At this time, the material to be riveted is subjected to the main downward acting force and the first indirect acting force, as well as the second indirect acting force upward. Part of the material to be riveted is squeezed into the middle position of the first object 200, so as to achieve the tight riveting of the first object 200 and the material to be riveted.

[0097] In the present utility model, a light-load spring 92 and a heavy-load spring 91 with inconsistent elastic coefficients are sleeved on the punch 8. When the punch 8 is subjected to the acting force of the piston rod 66 and presses the first object 200 onto the material to be riveted and penetrates into the interior of the material to be riveted, the light-load spring 92 and the heavy-load spring 91 will be compressed to generate a compression force, and this compression force will act on the demolding head 6, so that the nose 7 connected to the demolding head 6 can tightly press the material to be riveted. Under the further downward pressing of the piston rod 66 and the support of the die assembly, the material to be riveted can fill the waist position of the first object 200 according to its own metal fluidity, thus completing the entire riveting process.

[0098] Please refer to Figures 14-16 For Embodiment 2 of the present utility model, the difference from Embodiment 1 is that the detachable manner of the demolding head 6 and the gun nose 7 adopts a new method, and multiple light load springs 92 are provided. The specific structure is as follows: In this embodiment, an installation portion 74 is provided at the upper end of the gun nose 7, and a plurality of first installation holes 741 are provided on the installation portion 74. Moreover, a plug-in recessed portion 77 is formed between the upper end face of the gun nose 7 and the inner wall of the installation portion 74. At this time, when observing from below along the central axis of the punch demolding device 500, the projection of the gun nose 7 is located in the middle of the projection of the installation portion 74, and the first installation holes 741 are distributed around it with the projection of the gun nose 7 as the center.

[0099] A plug-in protrusion 691 is provided in the middle of the lower end face of the demolding head 6, and second installation holes 692 corresponding to the first installation holes 741 are provided around the lower end face of the demolding head 6 with the plug-in protrusion 691 as the center. During installation, only need to insert the plug-in protrusion 691 into the plug-in recessed portion 77, use an installation piece to pass through the first installation hole 741 and set it in the second installation hole 692, then the gun nose 7 can be installed at the lower end of the demolding head 6.

[0100] Specifically, a second through hole 947 is provided in the middle of the light load spring pressing block 94, and the light load spring pressing block 94 is sleeved on the punch 8 through the second through hole 947. With the second through hole 947 as the center, a plurality of groove-like structures 945 are provided on the lower end face of the light load spring pressing block 94. Specifically, the upper end face of the light load spring pressing block 94 is a flat surface, the lower end face of the light load spring pressing block 94 protrudes outward to form a convex block 944, and a plurality of the foregoing groove-like structures 945 are formed by inwardly concaving the outer edge of the convex block 944 at a predetermined same distance. Correspondingly, a spring avoidance through hole 693 is further provided on the lower end face of the demolding head 6, the size of the spring avoidance through hole 693 is basically the same as that of the light load spring 92, and a positioning recessed portion 742 with basically the same size as the spring avoidance through hole 693 is correspondingly provided on the installation portion 74.

[0101] When installing the gun nose 7 and the demolding head 6, the upper end of the light load spring 92 is arranged in the groove-like structure 945, and the lower end of the light load spring 92 passes through the spring avoidance through hole 693 and abuts against the positioning recessed portion 742.

[0102] Generally speaking, setting multiple light-load springs 92 has the following advantages: First, it can further prevent the first object 200 from sliding or misaligning during the positioning stage. Second, multiple light-load springs 92 can distribute the pressure applied to the workpiece more evenly, thereby reducing local stress concentration, decreasing the fatigue and wear of a single spring, and extending the service life of the punch ejector 500. Third, the force of the light-load springs 92 is small and easy to control. By adjusting the number and arrangement of the light-load springs 92, precise control of the total pressure can be achieved, improving the quality and consistency of the riveting process. Other technical features and technical effects are the same as those in the first embodiment and will not be elaborated here.

[0103] Please refer to Figures 17-19 , the present utility model also has a third embodiment. The difference between this embodiment and the first embodiment lies in that the structures of the heavy-load spring block 93 and the light-load spring block 94 are changed. Specifically, in this embodiment, the light-load spring block 94 is in a geometric shape (in this embodiment, the light-load spring block 94 is specifically a flat pad), and a third through hole 948 is provided in the middle, and the punch 8 is arranged in the third through hole. The heavy-load spring block 93 is columnar, and a blind hole 934 is provided on the lower end face, and the upper part 83 of the punch is arranged in the blind hole 934.

[0104] Furthermore, the length ratio among the upper part 83, the middle part 82, and the lower part 81 of the punch in this embodiment is also changed. After the change, it is approximately 1:1.5:1.1. This is only an example, and this embodiment is not limited thereto.

[0105] This embodiment simplifies the structures of both the heavy-load spring block 93 and the light-load spring block 94, resulting in a significant reduction in the masses of both the heavy-load spring block 93 and the light-load spring block 94. The advantages of such a setting are as follows: On the one hand, the reduction in the masses of the heavy-load spring block 93 and the light-load spring block 94 can improve the rapid response ability of the punch 8. On the other hand, it can reduce costs. Other technical features and technical effects are the same as those in the first embodiment and will not be elaborated here.

[0106] Please refer to Figure 20, the present utility model also has Embodiment 4. The difference between this embodiment and Embodiment 1 is that there is only one guiding structure 68 provided on the outer wall of the demolding head 6, and this guiding structure 68 is in the shape of a milled flat surface. The length of the guiding structure 68 is approximately 0.76 times the length of the entire driving part 63 of the demolding head, and the depth of the guiding structure 68 (that is, the specific degree of the guiding structure 68 concave inward towards the middle of the demolding head) is approximately 0.22 times the diameter of the entire driving part 63 of the demolding head. This is only for illustrative purposes, and this embodiment is not limited thereto. Specifically, the guiding structure 68 and the opening of the gun nose side channel 72 are on the same plane. By setting the guiding structure 68 in the shape of a milled flat surface, the direction of the rivet conveyor can be defined when installing the rivet conveyor. Other technical features and technical effects are the same as those in Embodiment 1 and will not be elaborated here.

[0107] The present utility model is not limited to the above embodiments. If various modifications or deformations of the present utility model do not depart from the spirit and scope of the present utility model, and provided that these modifications and deformations fall within the scope of the claims of the present utility model and equivalent technical scope, then the present utility model also intends to include these modifications and deformations.

Claims

1. A punch demoulder, characterized in that: include: A demoulding head, wherein a gun nose is detachably provided at the lower end of the demoulding head, a demoulding channel is provided inside the demoulding head, and a gun nose straight channel communicating with the demoulding channel is provided inside the gun nose; A punch, the punch is arranged inside the demoulding head, and the punch can move up and down in the demoulding channel and the gun nose straight channel; A heavy-load spring and at least one light-load spring, wherein the heavy-load spring and the light-load spring are sequentially sleeved on the punch; During demoulding, a force is applied to the demoulding head by squeezing the heavy-load spring and at least one light-load spring, so that the gun nose is pressed tightly against the riveted material.

2. The punch demoulder according to claim 1, characterized in that: The stripping head comprises a stripping head lower part and a stripping head upper part; The demoulding channel includes a first demoulding channel, a second demoulding channel and a third demoulding channel from bottom to top, and the diameters of the first demoulding channel, the second demoulding channel and the third demoulding channel increase in sequence.

3. The punch demoulder according to claim 1, characterized in that: The elastic coefficient of the heavy-load spring is greater than the elastic coefficient of the light-load spring.

4. The punch demoulder according to claim 1, characterized in that: The light-load spring is sleeved on an end of the punch close to the gun nose, and the heavy-load spring is sleeved on an end of the punch away from the gun nose.

5. The punch demoulder according to claim 4, characterized in that: It also includes a heavy-loaded spring pressure block and a light-loaded spring pressure block, wherein the heavy-loaded spring pressure block is arranged on the upper part of the punch, and the upper end of the heavy-loaded spring rests on the heavy-loaded spring pressure block; the light-loaded spring pressure block is sleeved on the middle part of the punch, and the light-loaded spring pressure block is located between the lower end of the heavy-loaded spring and the upper end of the light-loaded spring.

6. The punch demoulder according to claim 5, characterized in that: A first recessed portion and a second recessed portion are respectively provided at the upper end and the lower end of the light-load spring pressure block, and a first through hole is provided in the middle of the light-load spring pressure block, and the first recessed portion is connected with the second recessed portion through the first through hole.

7. The punch demoulder according to claim 5, characterized in that: A second through hole is arranged in the middle of the light-load spring pressure block, and a plurality of groove structures are arranged on the lower end surface of the light-load spring pressure block with the second through hole as the center, and the upper end of the light-load spring is arranged in the groove structure.

8. The punch demoulder according to claim 5, characterized in that: A third through hole is arranged in the middle of the light-load spring pressing block.

9. The punch demoulder according to claim 5, characterized in that: A blind hole is arranged at the lower end of the heavy-load spring pressure block, and the upper part of the punch is arranged in the blind hole.

10. The punch demoulder according to claim 5, characterized in that: A third recessed portion and a fourth recessed portion are respectively provided at the upper end and the lower end of the heavy-load spring pressing block, a fourth through hole is provided at the middle of the heavy-load spring pressing block, and the third recessed portion is connected with the fourth recessed portion through the fourth through hole; The punch is disposed in the fourth through hole, the upper end of the punch is disposed in the third recessed portion, and the upper end of the heavy load spring abuts against the fourth recessed portion.

11. The punch demoulder according to claim 1, characterized in that: Also included is an elastic limiting component; The elastic limiting component is arranged in the gun nose straight channel.

12. The punch demoulder according to claim 1, characterized in that: It also includes a driving device, wherein the lower end of the driving piston rod of the driving device is provided with a first cavity, and the upper end of the demoulding head is provided in the first cavity; When the driving device is working, the bottom wall of the first cavity abuts against the upper part of the punch, driving the demoulding head and the punch to move downward.

13. The punch demoulder according to claim 12, characterized in that: It also includes a demoulding head pressing plate, which is sleeved on the demoulding head and is detachably connected to the lower end of the driving piston rod.

14. The punch demoulder according to claim 13, characterized in that: A guide structure is arranged on the outer wall of the stripping head along the central axis direction, and the stripping head pressing plate is sleeved on the guide structure. Under the action of the driving piston rod, the stripping head pressing plate moves up and down in the guide structure.

15. The punch demoulder according to claim 14, characterized in that: The guide structure is in a keyway shape or a milled flat surface shape.

16. The punch demoulder according to any one of claims 1 to 15, characterized in that: A slot is transversely arranged on the side wall of the lower part of the demoulding head; An inserting cavity is arranged on the upper end of the gun nose, and a card-connecting through hole is transversely arranged on the upper side wall of the gun nose, and the card-connecting through hole passes through the inserting cavity; The lower part of the demoulding head is inserted into the plug-in cavity, a clamping piece is inserted into the clamping through hole, two ends of the clamping piece are located in the clamping through hole, and the middle part of the clamping piece is located in the clamping groove.

17. The punch ejector according to any one of claims 1 to 15, characterized in that: The upper end of the gun nose is provided with a mounting portion, and the mounting portion is provided with a plurality of first mounting holes; A plurality of second mounting holes corresponding to the plurality of first mounting holes are arranged on the lower end surface of the stripping head, one end of a mounting member passes through the first mounting hole and is arranged in the second mounting hole, and the gun nose is mounted on the lower end of the stripping head.

18. The punch demoulder according to claim 17, characterized in that: At least one positioning recess is arranged on the upper surface of the mounting portion, and the lower end of the light-load spring is arranged in the positioning recess.

19. The punch demoulder according to claim 17, characterized in that: When viewed from above, the projection of the gun nose is located in the middle of the projection of the mounting portion, and the first mounting holes are distributed around the projection of the gun nose with the projection of the gun nose as the center.

20. The punch demoulder according to claim 17, characterized in that: An inserting protrusion is arranged at the middle position of the lower end surface of the stripping head, and an inserting recess is formed between the upper end surface of the gun nose and the inner wall of the mounting portion. When the lower end of the stripping head and the upper end of the gun nose are mounted together, the inserting protrusion is inserted into the inserting recess.

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