E-shaped silicon steel sheet stamping die

Abstract

The E-shaped silicon steel sheet stamping die comprises a bottom plate, a lower pressing plate and three sets of die assemblies, an anti-blocking assembly is arranged between every two adjacent die assemblies, and each anti-blocking assembly comprises a lower base, a lifting arm vertically assembled on the lower base in a sliding mode, a connecting mechanism connected with the lifting arm and at least one control unit; the control unit comprises a cross rod connected with the connecting mechanism, a pair of clamping arms detachably clamped with the cross rod and a control mechanism matched with the clamping arms and used for controlling the pair of clamping arms to be opened and closed, after stamping is completed, when the lower pressing plate moves upwards, the cross rod is driven to move upwards through the clamping arms, and the lifting arm is driven to move upwards through the connecting mechanism; the silicon steel coiled material is separated from the lower die, burrs generated by stamping are prevented from hindering feeding of the silicon steel coiled material, the lifting arm jacks the silicon steel coiled material upwards, the silicon steel coiled material can be smoothly conveyed forwards, and after the lifting arm moves upwards, the clamping arm can be separated from the transverse rod so that next stamping can be facilitated.

Description

Technical Field

[0001] This invention relates to the field of mold-related technology, specifically to an E-shaped silicon steel sheet stamping die. Background Technology

[0002] E-shaped silicon steel sheets are thin sheets shaped like the letter "E" and stamped from silicon steel. They are key components forming the core of electromagnetic equipment such as motors and transformers. Their main function is to provide an efficient, low-loss magnetic circuit path for the electromagnetic equipment. When current flows through the coil, magnetic lines of force travel efficiently along the path formed by the silicon steel sheet.

[0003] E-shaped silicon steel sheets are stamped using progressive dies. Several sets of die assemblies stamp simultaneously. Each step forward of the stamping material involves different stamping processes completed sequentially at different workstations, culminating in the final product obtained from the last set of die assemblies. While the automatic feeder feeds the silicon steel coils according to the layout, the discharge end cannot traction the coils, so the entire conveying power comes from the automatic feeder.

[0004] During the stamping process, when the gap between the punch and die acts on the material, the material undergoes plastic deformation before fracture, resulting in edge protrusions that create burrs. These burrs can get stuck in the lower die. The greater the thickness of the product, the longer the burrs produced during stamping. Although the burrs produced by silicon steel coils during processing are short, once a jamming problem occurs, the silicon steel coil will bend, which is not conducive to continuous stamping. Even if it is stuck temporarily and then returns to normal during the feeding process, the internal stress generated by the bending will cause the silicon steel coil to shake repeatedly, thus affecting the stamping accuracy of the product. Therefore, it is necessary to design an E-shaped silicon steel sheet stamping die. Summary of the Invention

[0005] To address the aforementioned technical problems, the purpose of this invention is to overcome the issue in the prior art where material jamming during stamping affects continuous production and stamping quality.

[0006] To achieve the above objectives, the present invention provides an E-shaped silicon steel sheet stamping die, comprising: a base plate, a lower pressure plate, and three sets of die assemblies spaced apart along a straight line, wherein an anti-jamming component is provided between adjacent die assemblies. The anti-jamming assembly includes a lower base mounted on the base plate, a horizontal lifting arm vertically slidably mounted on the lower base, a connecting mechanism connected to the lifting arm, and at least one control unit connected to the connecting mechanism. The control unit includes a horizontal crossbar connected to the connecting mechanism, a pair of locking arms symmetrically mounted on the lower pressure plate about the crossbar and separable from the crossbar, and a control mechanism mounted on the base plate and matching the locking arms for controlling the opening and closing of the pair of locking arms. The lower base has a recessed groove that matches the lifting arm.

[0007] Preferably, the control unit further includes a mounting base fixedly mounted on the lower pressure plate. The top sides of a pair of snap-fit ​​arms are each mounted on the mounting base via a first hinge shaft arranged parallel to the crossbar. A torsion spring for pushing the snap-fit ​​arm to rotate closer to the other snap-fit ​​arm is mounted on the first hinge shaft. The lower end of the snap-fit ​​arm protrudes and is provided with a snap-fit ​​portion. The upper surface of the snap-fit ​​portion near the other snap-fit ​​arm is an arc-shaped wall that fits against the crossbar. The bottom side of the side wall of the snap-fit ​​portion near the other snap-fit ​​arm is inclined away from the other snap-fit ​​arm to form a first inclined wall. The mounting base protrudes and is provided with a limiting portion located in the middle of the pair of snap-fit ​​arms and capable of contacting the pair of snap-fit ​​arms. The crossbar has a circular cross-section.

[0008] Preferably, the control mechanism includes a vertical mounting arm fixedly mounted on the base plate, a sliding member slidably connected vertically to the mounting arm, a first elastic member for pushing the sliding member downward, a pair of control arms symmetrically arranged about the crossbar and both mounted on the sliding member via a second hinge axis parallel to the crossbar, a second elastic member for pushing the upper ends of the pair of control arms closer to each other, a pair of gears in a meshing state and respectively fixedly mounted on the hinge of the corresponding control arms along the same axis, an unlocking plate mounted on one of the control arms and inclined away from the other control arm at its upper end, and an unlocking rod mounted on the top of the mounting arm and located directly above the unlocking plate. The bottom side of the side wall away from the other snap-fit ​​arm is inclined toward the other snap-fit ​​arm to form a second inclined wall. The upper end of the side wall of the control arm near the other control arm is provided with a third inclined wall that matches the second inclined wall. A snap-fit ​​groove located below the third inclined wall is recessed on the side wall of the control arm near the other control arm. A snap-fit ​​strip that matches the snap-fit ​​groove is provided on the top of the second inclined wall.

[0009] Preferably, the second hinge shaft is assembled in the middle of the control arm, and a strip-shaped through groove is provided through the lower part of the control arm in the same length direction. The control mechanism also includes a limiting bolt that slides through a pair of strip-shaped through grooves on the control arm. The second elastic element is a first spring that is sleeved on the limit bolt and whose two ends respectively abut against a pair of control arms.

[0010] Preferably, the bottom of the mounting arm is recessed and provided with a sliding groove, and a slider is slidably mounted in the sliding groove. The slider includes a pressing part that slides out of the mounting arm and can contact the upper surface of the slider. The first elastic element is a second spring mounted in the sliding groove and whose lower end abuts against the upper surface of the slider.

[0011] Preferably, the connecting mechanism includes a connecting arm located below the base plate and at least one vertical slide bar fixedly connected to the connecting arm and slidingly passing through the base plate and connected to the corresponding crossbar; The slide bar has at least one protruding connecting part that slides through the base plate and the lower base to contact the lifting arm. The lifting arm is equipped with several vertical connecting bolts that connect to the connecting arm.

[0012] Preferably, a third spring is fitted on the connecting bolt, with its two ends respectively abutting against the lower base and the connecting arm.

[0013] Preferably, the middle part of the crossbar is fixedly connected to the slide bar, and the middle part of the locking part is provided with a notch to avoid the top of the slide bar.

[0014] Preferably, a rotating sleeve is fitted onto the crossbar.

[0015] According to the above technical solution, the E-shaped silicon steel sheet stamping die provided by the present invention has the following advantages compared with the prior art: After stamping is completed, the lower pressure plate moves upward. When the lower pressure plate moves upward, it drives the crossbar to move upward through the locking arm. Through the connecting mechanism, it drives the lifting arm to move upward, so that the silicon steel coil is separated from the lower die. This avoids burrs generated during stamping that may hinder the feeding of the silicon steel coil. After the lifting arm moves upward, the control mechanism separates from the pair of locking arms. The locking arms can no longer maintain the locking state with the crossbar, so the locking arms will separate from the crossbar. The crossbar and the lifting arm slide downward under their own weight to return to their original positions. At this time, the silicon steel coil will return to straightness to facilitate the next stamping.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description section; and all parts not covered in the present invention are the same as or can be implemented using the prior art. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural diagram of an E-shaped silicon steel sheet stamping die provided by the present invention. Figure 1 ; Figure 2 This is a three-dimensional structural diagram of an E-shaped silicon steel sheet stamping die provided by the present invention. Figure 2 ; Figure 3 This is a partial three-dimensional structural schematic diagram of an E-shaped silicon steel sheet stamping die provided by the present invention; Figure 4 This is a three-dimensional structural diagram of an anti-jamming component for an E-shaped silicon steel sheet stamping die provided by the present invention. Figure 1 ; Figure 5 This is a three-dimensional structural diagram of an anti-jamming component for an E-shaped silicon steel sheet stamping die provided by the present invention. Figure 2 ; Figure 6 This invention provides an E-shaped silicon steel sheet stamping die. Figure 4 Enlarged view of point A in the middle; Figure 7 This is a partial three-dimensional structural diagram of an anti-jamming component for an E-shaped silicon steel sheet stamping die provided by the present invention. Figure 1 ; Figure 8 This is a partial three-dimensional structural diagram of an anti-jamming component for an E-shaped silicon steel sheet stamping die provided by the present invention. Figure 2 ; Figure 9 This is a partial three-dimensional structural diagram of an anti-jamming component for an E-shaped silicon steel sheet stamping die provided by the present invention. Figure 3 .

[0018] Explanation of reference numerals in the attached figures 1. Base plate; 2. Lower pressure plate; 3. Mold assembly; 4. Lower base; 5. Lifting arm; 6. Crossbar; 7. Snap-fit ​​arm; 8. Mounting seat; 9. Torsion spring; 10. Snap-fit ​​part; 11. Arc-shaped wall; 12. Limiting part; 13. Mounting arm; 14. Sliding component; 15. First elastic component; 16. Control arm; 17. Second elastic component; 18. Gear component; 19. Unlocking plate; 20. Unlocking rod; 21. Second inclined wall; 22. Third inclined wall; 23. Snap-fit ​​groove; 24. Snap-fit ​​strip; 25. Strip-shaped through groove; 26. Limiting bolt; 27. Slider; 28. Connecting arm; 29. ​​Slide rod; 30. Connecting part; 31. Connecting bolt; 32. Third spring; 33. Notch. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0020] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "inner," and "outer" in the terminology represent only the orientation of the term in its normal use or are common terms understood by those skilled in the art, and should not be regarded as limitations on the term.

[0021] like Figure 1-9 As shown, an E-shaped silicon steel sheet stamping die includes: a base plate 1, a lower pressure plate 2, and three sets of die assemblies 3 arranged at intervals along a straight line. An anti-jamming component is provided between each pair of adjacent die assemblies 3. The anti-jamming component includes a lower base 4 mounted on a base plate 1, a horizontal lifting arm 5 vertically slidably mounted on the lower base 4, a connecting mechanism connected to the lifting arm 5, and at least one control unit connected to the connecting mechanism. The control unit includes a horizontal crossbar 6 connected to the connecting mechanism, a pair of locking arms 7 symmetrically mounted on a lower pressure plate 2 about the crossbar 6 and separable from the crossbar 6, and a control mechanism mounted on the base plate 1 and matching the locking arms 7 for controlling the opening and closing of the pair of locking arms 7. The lower base 4 is recessed with a groove matching the lifting arm 5.

[0022] In the above technical solution, the three sets of mold components 3 are continuous molds. The first set of mold components 3 is used for punching, the second set of mold components 3 is used for stamping out a pair of tongue pieces, and the third set of mold components 3 can simultaneously stamp out two E-shaped silicon steel sheets. Each set of mold components 3 includes a lower mold fixedly connected to the bottom and an upper mold fixedly connected to the lower pressure plate 2. The structure of the three sets of mold components 3 is existing technology, and its specific structure and stamping principle will not be described in this article. The silicon steel coil is continuously fed towards the mold assembly 3 by the automatic feeder. The upper molds in the three mold assemblies 3 simultaneously punch downwards. At this time, the locking arm 7 will lock with the crossbar 6. The control mechanism will contact the locking arm 7 to maintain the locking state between the locking arm 7 and the crossbar 6. After stamping is completed, the lower pressure plate 2 moves upward. When the lower pressure plate 2 moves upward, it will drive the crossbar 6 to move upward through the snap-fit ​​arm 7, thereby driving the lifting arm 5 to move upward through the connecting mechanism. The lifting arm 5 moves upward from the groove to push the silicon steel coil, so that the silicon steel coil is separated from the lower mold, avoiding the generation of burrs during stamping that would hinder the feeding of the silicon steel coil. The lifting arm 5 pushes the silicon steel coil upward, so that the silicon steel coil can be smoothly conveyed forward. After the lifting arm 5 moves upward, the control mechanism separates from the pair of locking arms 7. The locking arms 7 can no longer maintain the locking state with the crossbar 6, so the locking arms 7 will separate from the crossbar 6. The crossbar 6 and the lifting arm 5 slide downward to return to their original positions under their own gravity. At this time, the silicon steel coil will return to straightness to facilitate the next stamping.

[0023] In a preferred embodiment of the present invention, the control unit further includes a mounting base 8 fixedly mounted on the lower pressure plate 2. The top sides of a pair of snap-fit ​​arms 7 are each mounted on the mounting base 8 via a first hinge shaft arranged parallel to the crossbar 6. A torsion spring 9 for pushing the snap-fit ​​arm 7 to rotate closer to the other snap-fit ​​arm 7 is mounted on the first hinge shaft. A snap-fit ​​part 10 is provided protruding from the lower end of the snap-fit ​​arm 7. The upper surface of the snap-fit ​​part 10 near the other snap-fit ​​arm 7 is an arc-shaped wall 11 that fits against the crossbar 6. The bottom side of the side wall of the snap-fit ​​part 10 near the other snap-fit ​​arm 7 is inclined away from the other snap-fit ​​arm 7 to form a first inclined wall. A limiting part 12 is provided protruding from the mounting base 8, located in the middle of the pair of snap-fit ​​arms 7 and able to contact the pair of snap-fit ​​arms 7. The crossbar 6 has a circular cross-section.

[0024] In the above technical solution, when the lower pressure plate 2 moves downward, the first inclined wall first contacts the cross bar 6, and then the lower pressure plate 2 continues to move downward. Due to the presence of the first inclined wall, the locking arm 7 will passively rotate around the first hinge axis, thereby causing the locking part 10 to pass over the cross bar 6, and the torsion spring 9 will push the locking arm 7 to rotate downward and return to its original position. At this time, the lower pressure plate 2 continues to move downward, and the locking part 10 will continue to move downward to connect with the control mechanism, keeping the pair of locking arms 7 close to each other. When the lower pressure plate 2 moves upward, the arc-shaped wall 11 contacts the crossbar 6. Because the pair of locking arms 7 are kept close to each other under the action of the control mechanism, the locking part 10 will lift the crossbar 6 upward, causing the crossbar 6 to move upward, thereby moving the lifting arm 5 upward. After the lifting arm 5 is raised, the control mechanism separates from the locking arm 7. Because the arc-shaped wall 11 is in contact with the crossbar 6 and the crossbar 6 has a circular cross-section, the arc-shaped wall 11 cannot apply an effective upward force to the crossbar 6. Slippage will occur between the arc-shaped wall 11 and the crossbar 6, and the pair of locking arms 7 will be forced to rotate, which will increase the distance between the pair of locking parts 10 and separate them from the crossbar 6, thereby realizing the separation of the crossbar 6 from the locking arm 7. When the locking arm 7 contacts the limiting part 12, the locking arm 7 is in a vertical state, so that the pair of locking arms 7 can remain in a vertical state without external force, which is conducive to the locking part 10 passing over the crossbar 6 and locking with the control arm 16.

[0025] In a preferred embodiment of the present invention, the control mechanism includes a vertical mounting arm 13 fixedly mounted on a base plate 1, a sliding member 14 vertically slidably connected to the mounting arm 13, a first elastic member 15 for pushing the sliding member 14 downward, a pair of control arms 16 symmetrically arranged about a crossbar 6 and both mounted on the sliding member 14 via a second hinge axis parallel to the crossbar 6, a second elastic member 17 for pushing the upper ends of the pair of control arms 16 closer to each other, a pair of gears 18 in a meshing state and respectively fixedly mounted on the hinge of the corresponding control arms 16 along the same axis, an unlocking plate 19 mounted on one of the control arms 16 and inclined away from the other control arm 16, and an unlocking rod 20 mounted on the top of the mounting arm 13 and located directly above the unlocking plate 19. The snap-fit ​​portion 10 is inclined toward the other snap-fit ​​arm 7 from the bottom side of the side wall away from the other snap-fit ​​arm 7 to form a second inclined wall 21. The upper end of the side wall of the control arm 16 near the other control arm 16 is provided with a third inclined wall 22 that matches the second inclined wall 21. The side wall of the control arm 16 near the other control arm 16 is recessed and provided with a snap-fit ​​groove 23 located below the third inclined wall 22. The top of the second inclined wall 21 is provided with a snap-fit ​​strip 24 that matches the snap-fit ​​groove 23.

[0026] In the above technical solution, when the locking part 10 passes the crossbar 6, it continues to move downward, the second inclined wall 21 contacts the third inclined wall 22, the lower pressure plate 2 continues to move upward, and the pair of locking parts 10 will push the gap between the upper ends of the pair of control arms 16 to be forced to increase, so that the locking strip 24 continues to move downward and locks with the corresponding locking groove 23. The upper ends of the pair of control arms 16 approach each other under the action of the first elastic member 15, thereby maintaining the locking state of the locking groove 23 and the locking strip 24. After the arc-shaped wall 11 supports the crossbar 6 and moves upward, the sliding member 14 slides upward on the mounting arm 13 until the unlocking plate 19 contacts the unlocking rod 20. When the pressure plate 2 continues to move upward, the unlocking plate 19 will drive the control arm 16 to rotate passively under the interception of the unlocking rod 20. Through a pair of meshing gears 18, the other control arm 16 will rotate, thereby increasing the distance between the upper ends of the pair of control arms 16. The locking part 10 will separate from the control arm 16. At this time, the pair of locking arms 7 loses the restraining effect of the pair of control arms 16. The arc-shaped wall 11 will slide on the surface of the crossbar 6, thereby increasing the distance between the lower ends of the pair of locking arms 7 and releasing the crossbar 6, thereby separating the locking arms 7 from the crossbar 6. After the control arm 16 separates from the snap-fit ​​arm 7, the second elastic element 17 will push the slider 14 to slide down on the mounting arm 13 to return to its original position.

[0027] In a preferred embodiment of the present invention, the second hinge shaft is assembled in the middle of the control arm 16, and a strip-shaped through groove 25 is provided through the lower part of the control arm 16 in the same length direction. The control mechanism also includes a limiting bolt 26 that slides through a pair of strip-shaped through grooves 25 on the control arms 16. The second elastic element 17 is a first spring that is sleeved on the limiting bolt 26 and whose two ends respectively abut against a pair of control arms 16.

[0028] In the above technical solution, when the locking part 10 presses the upper end of the control arm 16, the lower ends of the pair of control arms 16 approach each other, thereby further compressing the first spring. Therefore, after the locking bar 24 passes the third inclined wall 22, the first spring can push the lower ends of the pair of control arms 16 away from each other, that is, the pair of control arms 16 approach each other, maintaining the locking state of the control arm 16 and the locking part 10.

[0029] In a preferred embodiment of the present invention, the bottom of the mounting arm 13 is recessed and a sliding groove is provided. A slider 27 is slidably mounted in the sliding groove. The slider 27 includes a pressing part that slides out of the mounting arm 13 and can contact the upper surface of the slider 14. The first elastic member 15 is a second spring mounted in the sliding groove and whose lower end abuts against the upper surface of the slider 27.

[0030] In the above technical solution, when the slider 14 moves upward, it will drive the slider 27 to move upward in the groove. At this time, the second spring is further compressed. After the control arm 16 separates from the snap-fit ​​arm 7, the second spring can push the slider 27 to slide downward, thereby pushing the slider 14 to slide downward on the mounting arm 13 to return to its original position through the pressing part.

[0031] In a preferred embodiment of the present invention, the connecting mechanism includes a connecting arm 28 located below the base plate 1 and at least one vertical slide bar 29 fixedly connected to the connecting arm 28 and slidingly passing through the base plate 1 and connected to the corresponding crossbar 6. The slide bar 29 has at least one connecting part 30 that slides through the base plate 1 and the lower base 4 and contacts the lifting arm 5. The lifting arm 5 is equipped with a plurality of vertical connecting bolts 31 that are connected to the connecting arm 28.

[0032] In the above technical solution, when the crossbar 6 moves upward, it will drive the connecting arm 28 to move upward in sync through the slide bar 29. The connecting arm 28 will be fixedly connected to the lifting arm 5 through the connecting part 30 and the connecting bolt 31. Therefore, the connecting arm 28 will drive the lifting arm 5 to rise.

[0033] In a preferred embodiment of the present invention, a third spring 32 is sleeved on the connecting bolt 31, with its two ends respectively abutting against the lower base 4 and the connecting arm 28.

[0034] In the above technical solution, the third spring 32 helps to push the connecting arm 28 downward, thereby driving the lifting arm 5 downward to enter the groove for reset.

[0035] In a preferred embodiment of the present invention, the middle part of the crossbar 6 is fixedly connected to the slide bar 29, and the middle part of the locking part 10 is provided with a notch 33 to avoid the top of the slide bar 29.

[0036] In the above technical solution, the locking part 10 on the locking arm 7 can apply an upward force to the crossbar 6 from both sides of the crossbar 6. The crossbar 6 and the slide bar 29 are subjected to uniform force, which is conducive to driving the crossbar 6 to move upward.

[0037] In a preferred embodiment of the present invention, a rotating sleeve is fitted onto the crossbar 6.

[0038] In the above technical solution, the swivel can reduce the resistance encountered by the snap-fit ​​part 10 when it moves downward and passes over the crossbar 6; at the same time, it is also conducive to the separation of the snap-fit ​​part 10 and the crossbar 6 after the snap-fit ​​strip 24 is removed from the slot.

[0039] Working principle: In a conventional mold assembly, the moving distance between the upper and lower molds is 25-50mm. Taking 50mm as an example, when the upper mold moves downward to complete the stamping, it is in contact with the silicon steel coil. At this time, the distance between the arc-shaped wall 11 and the crossbar 20 is 5mm, and the arc-shaped wall 11 is lower than the crossbar 20. Then, the upper mold moves upward. Generally, after moving about 3mm, the upper mold separates from the lower mold. When it rises to 5mm, the arc-shaped wall 11 contacts the crossbar 20. At this point, the crossbar 20 will carry... The lifting arm 5 moves upward. When the upper mold moves upward to 10mm, the silicon steel coil has been pushed upward by the lifting arm 5, which solves the problem of feeding jamming. At this time, the automatic feeder feeds the material. When the upper mold moves to 20mm, the unlocking rod 20 contacts the unlocking plate 19. When it continues to move upward, the locking arm 7 will release the crossbar 20, and the lifting arm 5 will move downward to provide service. At this time, the silicon steel coil is still being fed. The feeding time of the automatic feeder generally ends when the upper mold moves to the highest point or just descends.

[0040] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0042] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. An E-shaped gasket stamping die characterized by, The utility model relates to a moulding machine for producing a plurality of moulding products, comprising: a base plate (1), a lower pressing plate (2) and three groups of mould assemblies (3) arranged in a linear direction, a jam prevention assembly is arranged between every two adjacent mould assemblies (3); the jam prevention assembly comprises a lower base (4) assembled on the base plate (1), a horizontal lifting arm (5) vertically and slidingly assembled on the lower base (4), a connecting mechanism connected with the lifting arm (5) and at least one control unit connected with the connecting mechanism, the control unit comprises a horizontal cross bar (6) connected with the connecting mechanism, a pair of clamping arms (7) in a symmetrical state about the cross bar (6) and assembled on the lower pressing plate (2) and can be separated from the cross bar (6), and a control mechanism assembled on the base plate (1) and matched with the clamping arms (7) for controlling the opening and closing of the pair of clamping arms (7), and a recess matched with the lifting arm (5) is recessed on the lower base (4).

2. The E-shaped gasket stamping die of claim 1, wherein, the control unit further comprises a mounting seat (8) fixedly assembled on the lower pressing plate (2), the top side of the pair of clamping arms (7) is assembled on the mounting seat (8) through a first hinged shaft arranged in parallel with the cross bar (6), a torsional spring (9) for pushing the clamping arm (7) to rotate close to the other clamping arm (7) is assembled on the first hinged shaft, a clamping part (10) is protruded on the lower end of the clamping arm (7), the clamping part (10) is an arc-shaped wall (11) on the upper surface of the clamping arm (7) close to the other clamping arm (7) and is matched with the cross bar (6), the side wall bottom side of the clamping part (10) close to the other clamping arm (7) is inclined away from the other clamping arm (7) to form a first inclined wall, a limiting part (12) is protruded on the mounting seat (8) and is located in the middle of the pair of clamping arms (7) and can contact the pair of clamping arms (7), and the cross section of the cross bar (6) is circular.

3. The E-shaped gasket stamping die of claim 2, wherein, the control mechanism comprises a vertical mounting arm (13) fixedly assembled on the base plate (1), a sliding piece (14) vertically and slidingly connected with the mounting arm (13), a first elastic piece (15) for pushing the sliding piece (14) to slide downwards, a pair of control arms (16) arranged in a symmetrical state about the cross bar (6) and assembled on the sliding piece (14) through a second hinged shaft parallel with the cross bar (6), a second elastic piece (17) for pushing the upper ends of the pair of control arms (16) to be close to each other, a pair of gear pieces (18) in an engaged state and coaxially and fixedly assembled at the hinged positions of the corresponding control arms (16), an unlocking plate (19) assembled on one control arm (16) and inclined away from the other control arm (16) at the upper end, and an unlocking rod (20) assembled on the top of the mounting arm (13) and located directly above the unlocking plate (19). The clamping part (10) is inclined towards the other clamping arm (7) from the bottom side of the side wall of the other clamping arm (7) to form a second inclined wall (21), the control arm (16) is provided with a third inclined wall (22) matching the second inclined wall (21) on the upper end of the side wall of the other control arm (16), the control arm (16) is provided with a clamping groove (23) below the third inclined wall (22) on the upper recess of the side wall of the other control arm (16), and the top of the second inclined wall (21) is provided with a clamping strip (24) matching the clamping groove (23).

4. The E-shaped gasket stamping die of claim 3, wherein, The second hinge shaft is arranged in the middle of the control arm (16), the lower part of the control arm (16) is provided with a strip-shaped through groove (25) in the length direction, and the control mechanism further comprises a limiting bolt (26) sliding through the strip-shaped through grooves (25) on the pair of control arms (16). The second elastic member (17) is a first spring sleeved on the limiting bolt (26) and abutting against the pair of control arms (16) at both ends.

5. The E-shaped gasket stamping die of claim 3, wherein, The bottom of the mounting arm (13) is recessed to be provided with a sliding groove, the sliding groove is slidingly provided with a sliding block (27), the sliding block (27) comprises a pressing part sliding out of the mounting arm (13) and capable of contacting the upper surface of the sliding member (14), and the first elastic member (15) is a second spring arranged in the sliding groove and abutting against the upper surface of the sliding block (27) at the lower end.

6. The E-shaped gasket stamping die of claim 2, wherein, The connecting mechanism comprises a connecting arm (28) below the bottom plate (1) and at least one vertical sliding rod (29) fixedly connected with the connecting arm (28) and sliding through the bottom plate (1) and connected with the corresponding horizontal rod (6). The sliding rod (29) is provided with at least one connecting part (30) protruding therefrom and sliding through the bottom plate (1) and the lower base (4) and contacting the lifting arm (5), and the lifting arm (5) is provided with a plurality of vertical connecting bolts (31) connected with the connecting arm (28).

7. The E-shaped gasket stamping die of claim 6, wherein, The connecting bolt (31) is sleeved with a third spring (32) abutting against the lower base (4) and the connecting arm (28) at both ends.

8. The E-shaped gasket stamping die of claim 6, wherein, The middle part of the horizontal rod (6) is fixedly connected with the sliding rod (29), and the middle part of the clamping part (10) is provided with a notch part (33) avoiding the top of the sliding rod (29).

9. The E-shaped gasket stamping die of claim 1, wherein, The horizontal rod (6) is sleeved with a rotating sleeve.

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