Oscillating pressure relief shear

Abstract

The application discloses a swingable pressure-residual shears, which comprises a shears frame, the shears frame has a shearing surface on one side; a shears head, the shears head is provided with a blade, the shears head is rotatably installed on the side of the shears head away from the shearing surface through a rotating shaft, the center of the rotating shaft is eccentrically arranged with the center of the shears head, so that the shears head rotates away from the shearing surface under the action of its own gravity; a guide mechanism, the guide mechanism is used for guiding the shears head to rotate close to or away from the shearing surface, and the blade is used for being located on the shearing surface after the shears head rotates close to the shearing surface. The swingable pressure-residual shears can drive the blade of the shears head to be located on the shearing surface through the guide mechanism during shearing action, and normal shearing operation is carried out; and the blade of the shears head can rotate away from the shearing surface under the action of its own gravity during return.

Description

Technical Field

[0001] This invention relates to the field of extrusion equipment technology, and in particular to a swingable residual shear. Background Technology

[0002] Currently, extrusion presses are the main equipment for the production of light alloy (aluminum alloy, copper alloy and magnesium alloy) tubes, bars and profiles. They mainly use extrusion rods to extrude the hot-molten light alloy in the extrusion cylinder into the forming die, and then extrude it through the forming orifice after forming at the forming die. It is an important industrial process.

[0003] The die holder of the forming die on the extruder is usually fastened to the beam of the extruder by bolts or other structures and cannot be adjusted. There will be a gap between the extrusion cylinder and the forming die, which can easily cause molten material to stagnate during the forming process and affect the forming of the next product. Therefore, an excess shear is installed on the extruder to cut off the excess material at the exit position of the forming die after extrusion.

[0004] However, the residual shear can only move vertically. When it returns after cutting the residual material, the shear blade will scratch the material surface on the die shearing surface. When it connects with the next material bar, it will create cavitation and trap gas, ultimately causing defects in the profile product near the joint. If a rotating structure is used, only the drive structure needs to drive the entire shear frame to rotate. The shear frame is equipped with hydraulic cylinders and other drive structures, making the overall structure too heavy and prone to wobbling during rotation, creating a safety hazard. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a swingable shear with a residual shear. During the shearing action, the guide mechanism can drive the blade of the shear head to be located on the shearing surface for normal shearing operation; while during the return to the original position, the blade of the shear head can rotate away from the shearing surface under its own gravity.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A swingable compression shear includes,

[0008] A scissor frame, wherein one side of the scissor frame has a shearing surface;

[0009] The scissor head is equipped with a blade. The scissor head is rotatably mounted on the side of the scissor head away from the cutting surface via a rotating shaft. The center of the rotating shaft is eccentrically set with respect to the center of the scissor head, so that the scissor head rotates away from the cutting surface under its own weight.

[0010] A guiding mechanism is provided to guide the scissor head to rotate closer to or away from the cutting surface, and the blade is positioned on the cutting surface after the scissor head rotates closer to the cutting surface.

[0011] Further, the guiding mechanism comprises a guiding rod and a guiding slot, the guiding slot is provided with a first guiding portion near the side of the shearing surface, the guiding rod is connected to the guiding slot and can move towards or away from the first guiding portion, the guiding rod is used to abut against the first guiding portion after moving towards the first guiding portion, so as to rotate the shearing head towards the shearing surface.

[0012] Further, the guiding rod is provided with a second guiding portion, the second guiding portion is used to slide with the first guiding portion after the guiding rod moves towards the first guiding portion, so as to guide the shearing head to rotate towards the shearing surface.

[0013] Further, the first guiding portion is an inner taper surface, and the second guiding portion is an outer taper surface; the outer diameters of the inner taper surface and the outer taper surface gradually increase from top to bottom.

[0014] Further, the first guiding portion is a first inclined surface, and the second guiding portion is a second inclined surface; the first inclined surface and the second inclined surface both gradually incline towards the shearing surface from top to bottom; the guiding rod can move along the axial direction of the guiding rod.

[0015] Further, the guiding slot is provided with a third guiding portion away from the side of the shearing surface, the guiding rod is used to move towards the third guiding portion after moving away from the first guiding portion, and slide with the third guiding portion, the third guiding portion is used to guide the shearing head to rotate away from the shearing surface when the guiding rod slides.

[0016] Further, the guiding rod is provided with a fourth guiding portion used to slide with the third guiding portion.

[0017] Further, the third guiding portion is a sliding block, the sliding block is protruded on the inner wall of the guiding slot away from the first guiding portion; the fourth guiding portion is provided on the side of the guiding rod away from the second guiding portion; the sliding block is provided with a third inclined surface, and the fourth guiding portion is a fourth inclined surface; the third inclined surface and the fourth inclined surface both gradually incline towards the shearing surface from top to bottom.

[0018] Further, the guiding mechanism comprises a guiding rod driving member; the guiding rod driving member is provided in the shearing frame, the shearing frame is provided with a connecting slot, one end of the guiding rod is connected to the connecting slot and protrudes from the top end of the connecting slot to be connected with the guiding rod driving member, the other end of the guiding rod is connected to the guiding slot, and the guiding rod driving member is used to drive the guiding rod to move.

[0019] Further, the guiding slot penetrates to the bottom end of the shearing head, and the bottom end of the guiding rod can protrude along the bottom end of the guiding slot and form a material removing portion.

[0020] Further, the bottom end of the scissor frame is provided with a limiting surface, which is used to abut against the top end surface of the scissor head after the scissor head is rotated close to the shearing surface, so that the blade is located on the shearing surface.

[0021] Further, the side surface of the scissor frame is provided with a dust cover, which is arranged outside the limiting surface and the top end of the scissor head.

[0022] Further, the scissor frame is internally provided with a gas blowing channel, which penetrates to the limiting surface and is used to guide gas to the limiting surface.

[0023] Further, the swingable excess material shearing device further comprises a scissor frame driving member, which is used to drive the scissor frame to move along the axial direction of the scissor frame.

[0024] Further, the swingable excess material shearing device further comprises a mounting bracket, which is provided with a positioning pin, and the scissor frame is provided with a positioning groove, the positioning pin can move close to or away from the positioning groove; the positioning pin is used to be inserted into the positioning groove after being close to the positioning groove, so that the scissor frame is fixed with the mounting bracket.

[0025] Compared with the prior art, the beneficial effects of the present application are that:

[0026] When in the initial state, the guide mechanism can guide the scissor head to rotate close to the shearing surface, so that the blade of the scissor head is located on the shearing surface; when the shearing action is performed, the scissor frame can be driven by the driving structure to move close to the excess material surface on the forming die of the extruder, so as to scrape the excess material on the forming die; when returning, the guide mechanism can guide the scissor head to rotate away from the shearing surface, and at the same time, the scissor head can move away from the shearing surface under the action of its own gravity, so that the blade of the scissor head can keep a distance from the shearing surface on the forming die, and the excess material surface on the shearing surface will not be scratched during the resetting process. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structure schematic view of the use state of the excess material shearing device of the present application;

[0028] Figure 2 It is a structure schematic view of the excess material shearing device of the present application;

[0029] Figure 3 It is another perspective structure schematic view of the excess material shearing device of the present application;

[0030] Figure 4 It is a structure schematic view of one use state of the excess material shearing device of the present application;

[0031] Figure 5 It is another structure schematic view of one use state of the excess material shearing device of the present application;

[0032] Figure 6 A schematic view of a partial structure of the excess material shearing device of the present application;

[0033] Figure 7 A schematic view of another structure of the excess material shearing device of the present application;

[0034] Figure 8 A schematic view of a use state structure of the excess material shearing device in Figure 7

[0035] Figure 9 A schematic view of another use state structure of the excess material shearing device in Figure 7

[0036] In the figure: 10, shearing frame; 11, shearing surface; 12, limiting surface; 13, air blowing passage; 14, dust cover; 20, shearing head; 21, blade edge; 22, rotating shaft; 23, guide groove; 231, first guide part; 232, sliding block; 233, third guide part; 24, shearing blade; 30, guide rod; 31, material striking part; 32, second guide part; 321, outer conical surface; 33, fourth guide part; 40, guide rod driving member; 50, shearing frame driving member; 60, mounting bracket; 61, positioning pin. DETAILED DESCRIPTION

[0037] The present application will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0038] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as limiting the devices or elements indicated or implied to have a specific orientation, to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application.

[0040] Example 1,

[0041] As Figure 1 An oscillating excess material shearing device as shown in -6, comprising a shearing frame 10, a shearing head 20 and a guide mechanism, one side of the shearing frame 10 having a shearing surface 11.

[0042] ​​In addition, the shearing head 20 is provided with a blade 21, the shearing head 20 is rotatably installed on the shearing head 20 through a rotating shaft 22, and the rotating shaft 22 of the shearing head 20 is installed on the side away from the shearing surface 11, and the center of the rotating shaft 22 is eccentrically arranged with the center of the shearing head 20. Since the shearing surface 11 and the rotating shaft 22 are respectively located on the two sides of the shearing frame 10, the shearing head 20 can rotate away from the shearing surface 11 under its own action without external force, so that the blade 21 of the shearing head 20 is away from the shearing surface 11.

[0043] The guide mechanism can guide the shearing head 20 to rotate close to or away from the shearing surface 11, and the blade 21 can be located on the shearing surface 11 after the shearing head 20 rotates close to the shearing surface 11.

[0044] Based on the above structure, in the initial state, the shearing head 20 can be kept in the state of rotating close to the shearing surface 11 under the guidance of the guide mechanism, so that the blade 21 of the shearing head 20 is located on the shearing surface 11.

[0045] When the excess material is sheared, the shearing frame 10 can be driven to move downward by the driving structure to move close to the excess material surface on the forming die of the extruder. Since the blade 21 of the shearing head 20 is kept on the shearing surface 11 under the action of the guide mechanism, the blade 21 on the shearing head 20 can scrape the excess material on the forming die during the movement.

[0046] When returning, the guide mechanism can guide the shearing head 20 to rotate away from the shearing surface 11, and the shearing head 20 can rotate away from the shearing surface 11 under the action of its own gravity, so that the blade 21 of the shearing head 20 can keep a distance away from the shearing surface 11 on the forming die, and the excess material surface on the shearing surface 11 will not be scratched during the resetting process.

[0047] It should be noted that the shearing blade 24 can be fixed on the shearing head 20 by screws or other structures, and the blade 21 can be formed at the bottom end of the shearing blade 24. Compared with directly forming the blade 21 on the shearing head 20, the shearing blade 24 can be easily replaced when the blade is worn out during use. Specifically, in the embodiment, the guide mechanism includes a guide rod 30 and a guide groove 23, the first guide part 231 is arranged in the guide groove 23, the guide rod 30 penetrates the guide groove 23, and the guide rod 30 can move close to or away from the first guide part 231. And the guide rod 30 is used to abut against the first guide part 231 after moving close to the first guide part 231, so that the shearing head 20 rotates close to the shearing surface 11.

[0048] On the basis of the structure, when the shearing action is performed, the blade 21 of the shear head 20 can be kept on the shearing surface 11 of the shear frame 10 by operating the guide rod 30 to move the guide rod 30 close to the first guide part 231, and after the guide rod 30 moves close to the first guide part 231, the first guide part 231 can be driven to rotate the blade 21 of the shear head 20 close to the shearing surface 11 by the force provided by the guide rod 30, and the guide rod 30 moves in the guide groove 23, and the guiding process is relatively stable.

[0049] Further, the second guide part 32 can be arranged on the guide rod 30, and the second guide part 32 can be in sliding fit with the first guide part 231 after the guide rod 30 moves close to the first guide part 231 to guide the shear head 20 to rotate close to the shearing surface 11. That is to say, on the basis of the structure, when the blade 21 of the shear head 20 is driven to rotate close to the shearing surface 11, the guide rod 30 can move in the guide groove 23, the second guide part 32 on the guide rod 30 can move close to the first guide part 231 of the guide groove 23, and the first guide part 231 can guide the shear head 20 to rotate close to the shearing surface 11.

[0050] In one mode of the embodiment, the first guide part 231 is a first inclined surface, the second guide part 32 is a second inclined surface, and the first inclined surface and the second inclined surface are both inclined to gradually close to the shearing surface 11 from top to bottom; the guide rod 30 can move along the axial direction of the guide rod 30, and on the basis of the structure, the first inclined surface can be arranged on the side of the guide groove 23 close to the shearing surface 11, and similarly, the second inclined surface can be arranged on the side of the guide rod 30 close to the first inclined surface.

[0051] When the shearing action is performed, the guide rod 30 can move upward, and the second inclined surface can gradually close to the first inclined surface, and in the process of the second inclined surface closing to the first inclined surface, the second inclined surface can decompose the longitudinal force into the transverse force and apply the transverse force to the first inclined surface, and the first inclined surface can decompose the force into the longitudinal force, that is, the blade 21 of the shear head 20 can be swung upward to be attached to the shearing surface 11, and the shear frame 10 can be driven by the driving structure to complete the shearing action close to the excess material surface of the forming die.

[0052] When the shearing action is performed, the guide rod 30 can move upward, and the second inclined surface can gradually close to the first inclined surface, and in the process of the second inclined surface closing to the first inclined surface, the second inclined surface can decompose the longitudinal force into the transverse force and apply the transverse force to the first inclined surface, and the first inclined surface can decompose the force into the longitudinal force, that is, the blade 21 of the shear head 20 can be swung upward to be attached to the shearing surface 11, and the shear frame 10 can be driven by the driving structure to complete the shearing action close to the excess material surface of the forming die.

[0053] Further, the guide slot 23 is provided with a third guide part 233, which can guide the rod 30 to move away from the first guide part 231 and then move close to the third guide part 233 and slide with the third guide part 233. When the rod 30 slides with the third guide part 233, the third guide part 233 can guide the shearing head 20 to rotate away from the shearing surface 11.

[0054] Based on the structure, when returning, the rod 30 can move downward, and the rod 30 can move away from the first guide part 231. After the rod 30 moves away from the first guide part 231, the shearing head 20 loses the force, and the shearing head 20 can swing downward under the gravity. During the process that the rod 30 continues to move downward, the rod 30 can press the third guide part 233 in the guide slot 23, push the shearing head 20 to swing away from the shearing surface 11, and the blade 21 of the shearing head 20 can form a certain interval with the shearing surface 11 to prevent scratching the excess material surface of the forming die during the return.

[0055] In this way, when returning, the shaft 22 can be stuck or not sensitive, and the rod 30 can press the third guide part 233 to drive the shearing head 20 to rotate during the process that the rod 30 moves downward.

[0056] Further, in order to better press the third guide part 233 with the rod 30, the fourth guide part 33 can be arranged on the rod 30. The fourth guide part 33 and the second guide part 32 can be distributed in the height direction of the rod 30, that is, when the rod 30 moves downward, the fourth guide part 33 can press the third guide part 233 to guide the blade 21 of the shearing head to rotate away from the shearing surface 11, and when the rod 30 moves upward, the second guide part 32 of the rod 30 can press the first guide part 231 to guide the blade 21 of the shearing head to rotate close to the shearing surface 11.

[0057] More specifically, the third guide part 233 is a sliding block 232, which is protruded on the inner wall of the guide slot 23 away from the first guide part 231. The fourth guide part 33 is arranged on the side of the rod 30 away from the second guide part 32. The sliding block 232 is provided with a third inclined surface, and the fourth guide part 33 is a fourth inclined surface. The third inclined surface and the fourth inclined surface are both inclined to gradually close to the shearing surface 11 from top to bottom.

[0058] Thus, when the guiding rod 30 moves downward, the fourth inclined surface gradually approaches the third inclined surface, and when the guiding rod 30 continues to move downward, the fourth inclined surface is in close contact with and slides on the third inclined surface, the fourth inclined surface decomposes the longitudinal force into a transverse force, the transverse force is applied to the third inclined surface, the third inclined surface decomposes the force into a longitudinal force, the blade 21 of the shear head 20 swings backward away from the shearing surface 11, and the shear head 20 swings downward under the action of its own gravity, so that the blade 21 of the shear head 20 is spaced apart from the shearing surface 11 to prevent the blade 21 from scratching the excess material surface of the forming die during the return stroke.

[0059] When the blade 21 of the shear head 20 needs to be reset to the shearing surface 11, the guiding rod 30 moves upward, the fourth inclined surface is separated from the third inclined surface, and when the guiding rod 30 continues to move upward, the second inclined surface gradually approaches the first inclined surface, the second inclined surface decomposes the longitudinal force into a transverse force, the transverse force is applied to the first inclined surface, the first inclined surface decomposes the force into a longitudinal force, and the blade 21 of the shear head 20 swings upward to be in close contact with the shearing surface 11.

[0060] Of course, in another embodiment, the first guiding portion 231 and the third guiding portion 233 can also be selected as a convex block structure with a circular arc, that is, when the guiding rod 30 moves upward, the guiding rod 30 can press the circular arc surface of the circular arc convex block, and the circular arc can also decompose the force into different direction forces to achieve rotation. Correspondingly, the second guiding portion and the fourth guiding portion can also be selected as inclined surfaces or arc surfaces or conical surfaces to achieve the same effect.

[0061] In addition, the guiding mechanism can also be implemented by using an abutting block and an abutting block driving member, the abutting block is arranged on the side of the shear frame 10 away from the shearing surface 11, the abutting block driving member can drive the abutting block to abut against the side of the shear head 20 away from the shearing surface 11 to prevent the shear head 20 from swinging under the action of its own gravity, so that the blade 21 of the shear head 20 can be kept in close contact with the shearing surface 11. After the blade 21 of the shear head 20 finishes scraping the excess material, the abutting block driving member can drive the abutting block to move away from the side of the shear head 20, that is, the force applied to the side of the shear head 20 away from the shearing surface 11 is removed, the shear head 20 can swing downward under the action of its own gravity, and the blade 21 of the shear head 20 can be spaced apart from the shearing surface 11.

[0062] Further, the guiding mechanism includes a guiding rod driving member 40, the guiding rod driving member 40 is arranged in the shear frame 10, the guiding rod 30 is connected to the guiding rod driving member 40 through a through slot in the shear frame 10, and the other end of the guiding rod 30 is arranged in the guiding slot 23, and the guiding rod driving member 40 is used to drive the guiding rod 30 to move.

[0063] Thus, when driving the guide rod 30 to move, the guide rod 30 can be driven by the guide rod driving member 40 to move up and down, and the guide rod 30 can move up and down in the through slot of the shearing frame 10, and the through slot can guide the stable up and down movement of the guide rod 30, and the movement structure is more stable.

[0064] Further, the bottom end of the guide rod 30 can extend out of the bottom end of the guide slot 23 and form a material knocking portion 31.

[0065] On the basis of the structure, after the shearing frame 10 moves downward, the blade 21 on the shearing head 20 can scrape the excess material on the forming die, and the scraped excess material can adhere to the blade 21 of the shearing head 20. Therefore, in the embodiment, the guide slot 23 can be provided as a through slot structure, that is, the bottom end of the guide rod 30 can extend out of the bottom end of the shearing head 20 during upward movement, and after the guide rod 30 moves downward away from the first guide portion 231, the blade 21 of the shearing head 20 can swing backward under its own gravity, and the bottom end of the guide rod 30 extends out of the material knocking portion 31, which can knock off the excess material on the blade 21 of the shearing head 20, that is, the guide rod 30 can also function as a material knocking rod, avoiding the adhesion of excess material on the blade 21 of the shearing head 20, facilitating later cleaning, and without the need to additionally provide a material knocking rod.

[0066] Of course, the material knocking portion 31 can be formed by the end portion of the guide rod 30, or can be realized by a pad structure provided at the end portion of the guide rod 30. In short, any structure capable of knocking off the excess material on the blade 21 of the shearing head 20 after the guide rod 30 extends out of the bottom end of the guide slot 23 can be formed as the material knocking portion 31.

[0067] Further, referring to Figure 6 Further, a limiting surface 12 can be provided at the bottom end of the shearing frame 10, which can abut against the top end surface of the shearing head 20 after the shearing head 20 rotates close to the shearing surface 11, so that the blade 21 is located at the shearing surface 11. That is, after the shearing head 20 rotates close to the shearing surface 11 under the guiding action of the guide mechanism, the top end surface of the shearing head 20 can abut against the limiting surface 12 at the bottom end of the shearing frame 10, and abut against each other. In this state, the shearing surface 11 can be kept parallel to the blade 21 of the shearing head 20, preventing the shearing head 20 from protruding out of the shearing surface 11, and preventing the blade 21 of the shearing head 20 from protruding and colliding and being damaged.

[0068] More specifically, the shears frame 10 side is provided with a dust cover 14, the dust cover 14 cover is provided in the limiting surface 12 and the shears head 20 top outside, that is, in the shears head 20 and the assembly gap of the shears frame 10, is equipped with dust cover 14, because the shears head 20 can rotate relative to the shears frame 10, thus there is an assembly gap between the two, easy to stick dust or scrap in the process of use, cause the end face of the shears head 20 can not better with the limiting surface 12 of the shears frame 10, therefore set dust cover 14 cover the assembly gap between the two, prevent the external dust or scrap into in the process of use.

[0069] Further, it can also be provided with a blowing channel 13 in the shears frame 10, the blowing channel 13 through to the limiting surface 12 and is used for guiding gas to the limiting surface 12, similarly, because the shears head 20 can rotate relative to the shears frame 10, thus there is an assembly gap between the two, easy to stick dust or scrap in the process of use, cause the end face of the shears head 20 can not better with the limiting surface 12 of the shears frame 10, therefore can be through the introduction of compressed air in blowing channel 13 to the limiting surface 12, on the one hand, can blow dust, on the other hand, because there is gas introduction contact position, can guarantee the contact surface of the shears head 20 and the shears frame 10 is in the positive pressure state, dust and other impurities are not easy to enter, dustproof effect is better.

[0070] Further, the shears frame driving part 50 for driving the shears frame 10 to move along the axial direction of itself, that is, in the process of scrap shearing action, the shears frame driving part 50 can drive the shears frame 10 to move downward as a whole, so that the blade 21 of the shears head 20 connected with the shears frame 10 can perform the scrap shearing action, and after the scrap shearing action is completed, the shears frame driving part 50 drives the shears frame 10 to reset as a whole.

[0071] Further, the shears frame driving part 50 for driving the shears frame 10 to move along the axial direction of itself, that is, in the process of scrap shearing action, the shears frame driving part 50 can drive the shears frame 10 to move downward as a whole, so that the blade 21 of the shears head 20 connected with the shears frame 10 can perform the scrap shearing action, and after the scrap shearing action is completed, the shears frame driving part 50 drives the shears frame 10 to reset as a whole.

[0072] On the basis of the structure, when the shears frame 10 is installed on the machine body through the mounting bracket 60 in the application of the shears frame 10, the positioning pin 61 can move away from the positioning groove in the process of scrap shearing action, so that the shears frame 10 can be separated from the mounting bracket 60, and the shears frame 10 can move up and down under the driving of the shears frame driving part 50. When the shears frame 10 resets, the positioning groove of the shears frame 10 moves to correspond to the structure of the positioning pin 61 of the mounting bracket 60, the positioning pin 61 can move close to the positioning groove and be inserted into the positioning groove, so that the shears frame 10 is prevented from falling, and the structure is more stable.

[0073] Specifically, the movement of the positioning pin 61 can be driven by the driving structure, of course, the positioning pin 61 can also be selected as the pop pin structure in the prior art, that is, in the case that the scissor frame 10 does not act, the pop pin can be kept inserted into the positioning slot under the action of the elastic member of the pop pin, and when the scissor frame 10 is actuated downward by the scissor frame driving member 50, the driving force provided by the scissor frame driving member 50 can overcome the elastic stress provided by the elastic member of the pop pin, so as to drive the pop pin to exit the positioning slot, and the scissor frame 10 can normally realize the excess material shearing action.

[0074] Embodiment 2,

[0075] Referring to Figure 7 - Figure 9 Different from embodiment 1, in the embodiment, the first guide part 231 is an inner taper surface, and the second guide part 32 is an outer taper surface 321; the outer diameter of the inner taper surface and the outer taper surface 321 gradually increases from top to bottom.

[0076] When the shearing action is performed, the guide rod 30 can move upward, and the outer taper surface 321 can gradually approach the inner taper surface, and in the process of approaching the inner taper surface, the outer taper surface 321 can decompose the longitudinal force into a transverse force and apply it to the inner taper surface, and the inner taper surface can decompose the force into a longitudinal force, that is, the blade 21 of the scissor head 20 can be forced to swing upward to be attached to the shearing surface 11, and the scissor frame 10 can complete the shearing action by approaching the excess material surface of the forming die under the driving of the driving structure.

[0077] For those skilled in the art, other various corresponding changes and transformations can be made according to the technical solutions and concepts described above, and all these changes and transformations should belong to the protection scope of the claims of the present application.

Claims

1. An oscillating under-pressure shear, characterized in that, The utility model relates to a shearing machine, which comprises a shearing frame, a shearing head and a guide mechanism. The shearing head is provided with a blade and is pivotally mounted on one side of the shearing head away from the shearing surface by a pivot, the center of the pivot is eccentrically arranged with the center of the shearing head, so that the shearing head rotates away from the shearing surface under the action of its own gravity. The guide mechanism is used to guide the shearing head to rotate towards or away from the shearing surface, and the blade is used to be located on the shearing surface after the shearing head rotates towards the shearing surface. The guide mechanism comprises a guide rod and a guide slot, the side of the guide slot close to the shearing surface is provided with a first guide part, the guide rod is provided with a second guide part, the guide rod is inserted into the guide slot and can move towards or away from the first guide part, the second guide part is used to slide with the first guide part after the guide rod moves towards the first guide part, so as to guide the shearing head to rotate towards the shearing surface.

2. The oscillating under-pressure shear as claimed in claim 1, wherein, The side of the guide slot away from the shearing surface is provided with a third guide part, the guide rod is provided with a fourth guide part used to slide with the third guide part, the guide rod is used to move towards the third guide part and slide with the third guide part after moving away from the first guide part, so as to guide the shearing head to rotate away from the shearing surface.

3. The oscillating under-pressure shear as claimed in claim 1, wherein, The first guide part is an inner taper surface, and the second guide part is an outer taper surface; the outer diameters of the inner taper surface and the outer taper surface gradually increase from top to bottom.

4. The oscillating crop residue shear of claim 1, wherein, The first guide part is a first inclined surface, and the second guide part is a second inclined surface; the first inclined surface and the second inclined surface both gradually incline towards the shearing surface from top to bottom; the guide rod can move along its own axial direction.

5. The oscillating crop residue shear of claim 1, wherein, The third guide part is a sliding block, which is protruded on the inner wall of the guide slot away from the first guide part; the fourth guide part is provided on the side of the guide rod away from the second guide part; the sliding block is provided with a third inclined surface, and the fourth guide part is a fourth inclined surface; the third inclined surface and the fourth inclined surface both gradually incline towards the shearing surface from top to bottom.

6. The oscillating under-pressure shear as claimed in any one of claims 1 to 5, characterized in that, The guide mechanism comprises a guide rod driving member; the guide rod driving member is arranged in the shearing frame, the shearing frame is provided with a through slot, one end of the guide rod is inserted into the through slot and passes out from the top end of the through slot to be connected with the guide rod driving member, the other end of the guide rod is inserted into the guide slot; the guide rod driving member is used to drive the guide rod to move.

7. The oscillating under-pressure shear as claimed in any one of claims 1 to 5, characterized in that, The guide slot penetrates to the bottom end of the shearing head, and the bottom end of the guide rod can extend out along the bottom end of the guide slot and form a material striking part.

8. The oscillating under-pressure shear as claimed in claim 7, wherein, The bottom end of the shearing frame is provided with a limiting surface, which is used to abut against the top end surface of the shearing head after the shearing head rotates towards the shearing surface, so that the blade is located on the shearing surface.

9. The oscillating crop residue shear of claim 7, wherein, The side of the shearing frame is provided with a dust cover, which is arranged outside the limiting surface and the top end of the shearing head.

10. The oscillating under-pressure shear as claimed in any one of claims 1 to 5, characterized in that, The shearing frame is provided with a gas blowing channel, which penetrates to the limiting surface and is used to introduce gas to the limiting surface. The shearing machine also comprises a shearing frame driving member, which is used to drive the shearing frame to move along its own axial direction.

11. The oscillating crop residue shear of claim 10, wherein, The swingable excess pressure shearing machine further comprises a mounting support, a positioning pin is arranged on the mounting support, a positioning slot is arranged on the shearing frame, and the positioning pin can move close to or away from the positioning slot; the positioning pin is used for being inserted into the positioning slot after being close to the positioning slot, so that the shearing frame is fixed with the mounting support.

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