A beater and a manufacturing method thereof

Abstract

The application discloses a threshing knife and a manufacturing method thereof, and belongs to the technical field of knives. The threshing knife comprises a knife body of the threshing knife, the upper middle two side surfaces and the top surface of the knife body are threshing working surfaces, four-prism-shaped working teeth are arranged on the threshing working surfaces, and the four-prism-shaped working teeth are distributed in an array. According to the requirements of a tobacco threshing process, the shape structure parameters of the four-prism-shaped working teeth can be set, the working teeth on the threshing working surfaces can reach an optimal protruding height and a suitable sharpness degree, and the covering of tobacco tar can be effectively avoided. By reasonably using the array parameter configuration of the four-prism-shaped working teeth, the threshing blade structure can also be effectively optimized. The knife body of the threshing knife has sufficient strength and toughness, the four-prism-shaped working teeth on the working surface have high hardness and are not easy to wear, and the tearing performance of the threshing knife can be stably maintained for a long time.

Description

TECHNICAL FIELD

[0001] The present application relates to a beating apparatus for tobacco leaf processing, belonging to the technical field of cutters, and particularly discloses a beating cutter and a manufacturing method thereof. BACKGROUND

[0002] In the tobacco industry's primary processing production, a primary machine is used to tear and separate the tobacco leaves and stems (veins) in the tobacco leaves. The tobacco leaves are dragged and torn in the process of passing through the beating cutter, which is realized by the dynamic cutter teeth on the beating roller and the dynamic cutter teeth on the fixed cutter row, as well as the dragging and tearing in the frame. Among them, the dynamic cutter teeth on the beating roller and the fixed cutter teeth on the fixed cutter row are collectively referred to as beating cutters, which are the primary components for performing the tearing work. The two side surfaces and the top surface of the beating cutter are the beating working surfaces.

[0003] The working surface of the conventional beating cutter is made of hard alloy particles by a surfacing process. The beating process is mainly completed by the effective dragging and tearing of the hard alloy particles on the beating working surface. The protruding height and sharpness of the hard alloy particles on the beating working surface are the key factors that determine the working effect of the beating cutter. Although the hard alloy particles are not easy to wear, they are brittle materials, and the protruding height on the base material is generally not higher than 1.5 mm. During the beating process, the working surface of the beating cutter bears the reaction force of the tobacco leaves, and the hard alloy particles will be broken or fall off, resulting in a decrease in the protruding height and a decrease in the number of hard alloy particles, and the tearing effect is weakened or even lost. In addition, the adhesion and coverage of the working surface by the tobacco oil during the beating process further weaken the tearing effect of the hard alloy particles.

[0004] According to the new requirements of the primary processing and cigarette processing technology for the structure of the primary processing leaves: the optimal size range of the tobacco leaves should be 10-35 mm. When the leaf size is <10 mm, the filling capacity of the tobacco is sharply decreased; and when the leaf size is >35 mm, the filling capacity of the tobacco is not obviously increased, and the efficiency of the cigarette machine and the quality of the cigarette are affected. However, the actual situation is that the proportion of the oversized leaves with a size of >50 mm x 50 mm in the primary processing leaves is generally high, and it is difficult to meet the requirements of the primary processing and cigarette processing technology for further increasing the proportion of the medium-sized tobacco leaves.

[0005] The beating roller and the frame are important components for controlling the tearing and the leaf structure. According to the previous view, the beating roller speed and the frame size are the main factors affecting the leaf structure. Many technicians engaged in the beating and redrying have also made a large number of exploratory researches and tests in order to improve the above problems and reduce the large piece ratio, but the effect is very small. The reasons are as follows: 1. Increasing the beating roller speed can reduce the large piece ratio, but will increase the crushing; 2. Reducing the frame size can also reduce the large piece ratio, but will also increase the crushing. For more than ten years, how to achieve the goal of "reducing large and protecting middle", which has been a major technical problem that has plagued the cigarette and beating and redrying industry and needs to be solved urgently. SUMMARY

[0006] For the technical problems existing in the beating machine as described in the background art, the applicant of the present application proposes the following solutions:

[0007] In view of the technical problems existing in the application of the existing beating knife, the applicant of the present application has found through years of observation and verification that the retention of the height and sharpness of the hard alloy particles on the working surface of the beating knife is not ideal, which is an important reason for the generally low tearing efficiency of the beating machine. The present application provides a beating knife and a manufacturing method thereof, which is made of high-chromium alloy steel as a base material and is manufactured by an integrated forming process. The beating knife is integrally formed on the working surface in the form of an array of four-pyramid-shaped working teeth, the height and sharpness of which are controllable, and the covering of tobacco oil can be effectively avoided. The beating knife body has sufficient strength and toughness, and the four-pyramid-shaped working teeth on the working surface have high hardness and are not easy to wear, so that the tearing performance can be stably maintained for a long time.

[0008] As for how to improve the tearing efficiency and how to reduce the proportion of super large leaves, the previous solution to the problem is usually focused on improving the beating roller speed or adjusting the frame size and style, but few people pay attention to the essence of the tearing process and the performance improvement space brought by improving the primary component "beating knife" for tearing work. The beating knife described in the present application solves the low tearing effect of the traditional beating knife, and reasonably uses the essential principle of the tearing process. In the process of driving the tobacco leaves at high speed through the fixed knife and the frame by the moving knife, the notch effect formed by the many notches produced by the four-pyramid-shaped working teeth when they contact and move relative to the tobacco leaves is utilized. In the subsequent dragging and tearing process, the notches on the tobacco leaves are further expanded, which promotes the tearing of the tobacco leaves along the main leaf vein cleavage, realizes the separation of the leaf stem, and realizes the tearing of the tobacco leaves along the side leaf vein cleavage, thereby achieving the splitting of the super large leaves. It can be concluded through process test that the corresponding relationship and rules between the notch spacing size formed by the four-pyramid-shaped working teeth on the tobacco leaves and the leaf structure, and the reasonable configuration range of the shape structure and array parameters of the four-pyramid-shaped working teeth are determined, so as to realize the size control of the tearing process of the tobacco leaves and optimize the adjustment of the beating leaf shape structure.

[0009] The technical scheme adopted by the present application to solve the above technical problems is:

[0010] A threshing knife comprises a knife body of the threshing knife, the upper two side surfaces of the knife body are side threshing working surfaces, four-pyramid-shaped working teeth I are arranged on the side threshing working surfaces and are distributed in an array, the top surface of the knife body is a top threshing working surface, four-pyramid-shaped working teeth II are arranged on the top threshing working surface and are distributed in an array.

[0011] A pin shaft hole and a safety pin hole of the threshing knife are arranged on the central axis of the knife body, the distance between the center of the pin shaft hole and the bottom of the knife body is 1 / 2 of the width dimension of the knife body, the safety pin hole is located directly above the pin shaft hole, and the distance between the center of the safety pin hole and the center of the pin shaft hole is 1 / 2 of the width dimension of the knife body.

[0012] The length of the side threshing working surface of the threshing knife is 1 / 2-3 / 5 of the total length of the knife body.

[0013] The included angle of the opposite inclined surface forming line segments of the four-pyramid-shaped working teeth I on the side threshing working surface of the threshing knife is 25-35°, the forming line segments between the root and the bottom of the working tooth are circularly arc transition, the forming line of the top of the pyramid is circularly arc transition, and the height from the top of the pyramid to the bottom is 2.5-5 mm; the height direction of the side threshing working surface is the array longitudinal direction, the interval is 4-30 mm, the thickness direction of the side threshing working surface is the array transverse direction, and the interval is 4-5.5 mm.

[0014] The included angle of the opposite inclined surface forming line segments of the four-pyramid-shaped working teeth II on the top threshing working surface of the threshing knife is 35-40°, the forming line segments between the root and the bottom of the working tooth are circularly arc transition, the forming line of the top of the pyramid is circularly arc transition, and the height from the top of the pyramid to the bottom is 2.5-4 mm; the width direction of the top threshing working surface is the array longitudinal direction, the interval is 4-15 mm, the thickness direction of the top threshing working surface is the array transverse direction, and the interval is 4-5.5 mm.

[0015] The four-pyramid-shaped working teeth I on the side threshing working surface of the threshing knife and the four-pyramid-shaped working teeth II on the top threshing working surface are integrally formed with the knife body.

[0016] The knife body of the threshing knife is made of high-chromium alloy steel material.

[0017] The manufacturing method of the threshing knife comprises the following specific steps:

[0018] (1) selecting a high-chromium alloy steel plate material with a thickness greater than a preset threshing knife forming thickness;

[0019] (2) according to the preset planer profile of the threshing knife, blanking is laid out, and the bottom hole of the pin shaft hole and the safety pin hole is preformed on the high chromium alloy steel blank plate, the diameter of the bottom hole is required to be smaller than the final forming diameter of the corresponding pin shaft hole and safety pin hole, and several threshing knife plane profiles can be arranged on a high chromium alloy steel blank plate;

[0020] (3) the preformed high chromium alloy steel blank plate is subjected to quenching and high temperature tempering heat treatment to reach a preset hardness value;

[0021] (4) the upper and lower surfaces of the high chromium alloy steel blank plate after heat treatment are subjected to plane grinding processing, so as to reach a preset thickness size;

[0022] (5) on the numerical control wire cut electrical discharge machine tool, the ground plane, the preformed pin shaft hole and the safety pin hole are used as the processing reference to position and fix the high chromium alloy steel blank plate; according to the planar profile trajectory of the threshing knife, wire cutting forming of the pin shaft hole, the safety pin hole and the plane profile of the blade body is carried out; according to the profile trajectory of the side threshing working surface and the top threshing working surface in the thickness direction, the side threshing working surface and the top threshing working surface are subjected to orthogonal wire cut electrical discharge, respectively, to complete wire cut electrical discharge forming of the array distributed four-pyramid-shaped working teeth on the side threshing working surface and the top threshing working surface;

[0023] (6) the formed workpiece is subjected to nitriding treatment to form a nitrided wear-resistant layer on the surface of the threshing knife, that is, the threshing knife is manufactured.

[0024] The beneficial effects of the present application are:

[0025] (1) the four-pyramid-shaped working teeth on the working surface of the threshing knife are integrally formed and arrayed, compared with the hard alloy particles on the working surface of the threshing knife manufactured by the previous surfacing process, the four-pyramid-shaped working teeth have the advantages of not falling off and not being easy to break, the working teeth can achieve a better protrusion height and a suitable sharpness, can effectively avoid the coverage of tobacco tar, and comprehensively improve the leaf tearing performance of the threshing knife;

[0026] (2) the threshing knife of the present application is subjected to reasonable heat treatment and surface strengthening, has sufficient strength and toughness, and high surface hardness, the four-pyramid-shaped working teeth integrally formed on the working surface are not easy to wear, can maintain a suitable sharpness for a long time, and ensure the stability of the leaf tearing performance;

[0027] (3) The leaf-tearing knife of the present invention makes reasonable use of the essential principle of the leaf-tearing process. During the process of the moving knife driving the tobacco leaf through the fixed knife and frame at high speed, the four-sided pyramidal working teeth puncture and cut the tobacco leaf when in contact with and moving relative to it, which promotes the separation of leaf stems and the splitting of large leaves more effectively during the subsequent dragging and tearing process. The process test can summarize the correspondence and law between the gap size of the four-sided pyramidal working teeth on the tobacco leaf and the leaf structure. Based on this, the reasonable configuration range of the shape structure and array parameters of the four-sided pyramidal working teeth can be determined, so as to realize the size control of the tobacco leaf tearing process and optimize the leaf-tearing blade structure. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the blade structure;

[0029] Figure 2 This is the front view of the planar outline of the leaf-piercing blade;

[0030] Figure 3 This is a top view of the outline of the working surface of the blade.

[0031] Figure 4 This is a side view of the outline of the working surface of the top surface of the blade.

[0032] Figure 5 This is a schematic diagram of the blade structure (the working tooth array on the side working surface adopts a large-spacing configuration);

[0033] Figure 6 This is a schematic diagram of the blade structure (the working tooth array on the side working surface adopts a medium spacing configuration);

[0034] Figure 7 This is a schematic diagram of the blade structure (the working tooth array on the side working surface adopts a small-pitch configuration);

[0035] Figure 8 This is a schematic diagram of the blade structure (the spacing between the working teeth array on the side working surface is 10mm);

[0036] In the figure: 1-blade body, 2-side blade-beating working surface, 3-top blade-beating working surface, 4-pin hole, 5-safety pin hole, 6-square pyramidal working tooth I, 7-square pyramidal working tooth II, 8-blade-beating blade planar outline, 9-side working surface top view outline, 10-top working surface side view outline. Detailed Implementation

[0037] The present invention will be further described below with reference to specific embodiments.

[0038] Example 1: As Figures 1-8As shown, a threshing knife includes a knife body 1 of the threshing knife, two side surfaces of the upper part of the knife body 1 are side threshing working surfaces 2, four-pyramid-shaped working teeth I 6 are arranged on the side threshing working surfaces 2, the four-pyramid-shaped working teeth I 6 are distributed in an array, the top surface of the knife body 1 is a top threshing working surface 3, four-pyramid-shaped working teeth II 7 are arranged on the top threshing working surface 3, and the four-pyramid-shaped working teeth II 7 are distributed in an array.

[0039] A pin shaft hole 4 and a safety pin hole 5 of the threshing knife are arranged on the axis of the knife body 1, the distance between the center of the pin shaft hole 4 and the bottom of the knife body 1 is 1 / 2 of the width dimension of the knife body 1, the safety pin hole 5 is located directly above the pin shaft hole 4, and the distance between the center of the safety pin hole 5 and the center of the pin shaft hole 4 is 1 / 2 of the width dimension of the knife body 1.

[0040] The length of the side threshing working surface 2 of the threshing knife is 1 / 2-3 / 5 of the total length of the knife body 1 of the threshing knife.

[0041] The included angle of the opposite inclined surface forming line segments of the four-pyramid-shaped working teeth I 6 on the side threshing working surface of the threshing knife is 25-35°, the forming line segments between the root and the bottom of the working tooth are circularly arc transition, the forming line of the top of the pyramid is circularly arc transition, and the height from the top of the pyramid to the bottom is 2.5-5 mm; the height direction of the side threshing working surface 2 is the array longitudinal direction, the interval is 4-30 mm, and the thickness direction of the side threshing working surface 2 is the array transverse direction, and the interval is 4-5.5 mm.

[0042] The included angle of the opposite inclined surface forming line segments of the four-pyramid-shaped working teeth II 7 on the top threshing working surface of the threshing knife is 35-40°, the forming line segments between the root and the bottom of the working tooth are circularly arc transition, the forming line of the top of the pyramid is circularly arc transition, and the height from the top of the pyramid to the bottom is 2.5-4 mm; the width direction of the top threshing working surface 3 is the array longitudinal direction, the interval is 4-15 mm, and the thickness direction of the top threshing working surface 3 is the array transverse direction, and the interval is 4-5.5 mm.

[0043] The four-pyramid-shaped working teeth I 6 on the side threshing working surface 2 of the threshing knife and the four-pyramid-shaped working teeth II 7 on the top threshing working surface 3 of the threshing knife are integrally formed with the knife body.

[0044] The knife body 1 of the threshing knife is made of high-chromium alloy steel material.

[0045] The manufacturing method of the threshing knife includes the following specific steps:

[0046] (1) selecting a high-chromium alloy steel plate material with a thickness greater than the preset threshing knife forming thickness;

[0047] (2) According to the preset planar profile of the threshing knife, the blank plate of high chromium alloy steel is laid out and cut, and the bottom hole of the pin shaft hole and the safety pin hole is preformed, and the diameter of the bottom hole is smaller than the final forming diameter of the pin shaft hole and the safety pin hole, and several planar profiles of the threshing knife can be arranged on a blank plate of high chromium alloy steel;

[0048] (3) The preformed blank plate of high chromium alloy steel is subjected to quenching and high temperature tempering heat treatment to achieve the preset hardness value;

[0049] (4) The upper and lower surfaces of the high chromium alloy steel blank plate after heat treatment are subjected to planar grinding processing to achieve the preset thickness size;

[0050] (5) On the numerical control wire cut electrical discharge machine, the ground plane, the preformed pin shaft hole and the safety pin hole are used as the processing reference to position and fix the high chromium alloy steel blank plate; according to the planar profile trajectory of the threshing knife, the wire cutting forming of the pin shaft hole, the safety pin hole and the planar profile of the blade body is carried out; according to the profile trajectory of the side threshing working surface and the top threshing working surface in the thickness direction, the side threshing working surface and the top threshing working surface are subjected to orthogonal wire cut electrical discharge respectively to complete the wire cut electrical discharge forming of the four-pyramid-shaped working teeth arranged in an array on the side threshing working surface and the top threshing working surface;

[0051] (6) The formed workpiece is subjected to nitriding treatment to form a nitrided wear-resistant layer on the surface of the threshing knife, i.e. the threshing knife is manufactured.

[0052] Example 2: As shown in Figures 1-4 , a threshing knife includes a blade body 1 of the threshing knife, two side surfaces of an upper part of the blade body 1 are side threshing working surfaces 2, four-pyramid-shaped working teeth I 6 are arranged on the side threshing working surfaces 2 in an array, a top surface of the blade body 1 is a top threshing working surface 3, four-pyramid-shaped working teeth II 7 are arranged on the top threshing working surface 3 in an array.

[0053] A pin shaft hole 4 and a safety pin hole 5 of the threshing knife are arranged on the axis of the blade body 1, the distance between the center of the pin shaft hole 4 and the bottom of the blade body 1 is 1 / 2 of the width size of the blade body 1, the safety pin hole 5 is located directly above the pin shaft hole 4, and the distance between the center of the safety pin hole 5 and the center of the pin shaft hole 4 is 1 / 2 of the width size of the blade body 1.

[0054] The length of the side threshing working surface 2 of the threshing knife is 1 / 2-3 / 5 of the total length of the blade body 1 of the threshing knife (the total length of the conventional blade body of the threshing knife is 177.8 mm).

[0055] Preferably, the relative angle between the two inclined surfaces of the four-prism-shaped working tooth I 6 on the side beating surface 2 of the beater blade is 30°, the transition between the root of the working tooth and the bottom is a circular arc, the transition of the top of the cone is a rounded corner, and the height from the top of the cone to the bottom is 3.5 mm; the height direction of the side beating surface 2 is the array longitudinal direction, and the interval is 21 mm. In this embodiment, the thickness of the side beating surface 2 is preferably 7.0 mm, the thickness direction is the array transverse direction, and the interval is 5 mm.

[0056] Preferably, the relative angle between the two inclined surfaces of the four-prism-shaped working tooth II 7 on the top beating surface 3 of the beater blade is 40°, the transition between the root of the working tooth and the bottom is a circular arc, the transition of the top of the cone is a rounded corner, and the height from the top of the cone to the bottom is 3 mm. The width direction of the top beating surface 3 is the array longitudinal direction, and the interval is 15 mm. In this embodiment, the thickness of the top beating surface 3 is preferably 7.0 mm, the thickness direction is the array transverse direction, and the interval is 5 mm.

[0057] The four-prism-shaped working tooth I 6 on the side beating surface 2 of the beater blade and the four-prism-shaped working tooth II 7 on the top beating surface 3 of the beater blade are integrally formed with the blade body.

[0058] Preferably, the blade body 1 of the beater blade is made of high-chromium alloy steel material 4Cr13MoV.

[0059] The manufacturing method of the beater blade includes the following specific steps:

[0060] (1) Select a 4Cr13MoV alloy steel plate with a thickness of 8 mm;

[0061] (2) According to the preset planar contour of the beater blade, lay out and cut the material, and preform the bottom hole of the pin shaft hole and the safety pin hole on the 4Cr13MoV alloy steel blank plate, and the diameter of the bottom hole is smaller than the final forming diameter of the corresponding pin shaft hole and safety pin hole. Five beater blades can be arranged on a 4Cr13MoV alloy steel blank plate with a length of 200 mm and a width of 300 mm.

[0062] (3) Perform heat treatment of quenching and high-temperature tempering on the preformed 4Cr13MoV alloy steel blank plate, quenching temperature: 1050℃, holding for 2-3 hours; first tempering temperature: 580℃; second tempering temperature: 550℃; third tempering temperature: 550℃. The hardness after heat treatment: HRC 40-45;

[0063] (4) Perform planar grinding processing on the upper and lower surfaces of the heat-treated 4Cr13MoV alloy steel blank plate to achieve a preset thickness of 7.0 mm;

[0064] (5) On a CNC wire EDM machine, the ground plane, pre-made pin holes and safety pin holes are used as the machining reference to position and fix the high chromium alloy steel blank plate; according to the plane contour line trajectory of the blade, the pin holes, safety pin holes and the plane outline of the blade body are wire cut to form; then according to the contour line trajectory of the side blade working surface and the top blade working surface in the thickness direction, the side blade working surface and the top blade working surface are orthogonally wire cut to form the wire EDM of the four-sided pyramidal working teeth distributed in an array on the side blade working surface and the top blade working surface.

[0065] (6) Nitriding treatment is performed on the formed workpiece to form a nitrided wear-resistant layer with a thickness of 0.20 mm and a hardness of HV1200~1350 on the surface of the blade, thus making the blade.

[0066] The vertical working tooth array parameters of the leaf-beating blade side working surface in Example 2 are recommended for the configuration of the first and second stage leaf-beating processes.

[0067] Example 3: As Figure 5 As shown, the leaf-cutting blade in this embodiment has a basically the same structure as the leaf-cutting blade in Embodiment 2, the difference being:

[0068] Preferably, the relative angle between the inclined forming lines of the four-sided pyramidal working teeth I 6 on the side blade ...

[0069] The materials and manufacturing process used for the leaf-cutting blades are the same as in Example 2.

[0070] The vertical working tooth array on the side blade of Example 3 adopts a relatively large spacing parameter, which is suitable for process configurations that require a high proportion of large blades in the first stage of blade cutting.

[0071] Example 4: Figure 6 As shown, the leaf-cutting blade in this embodiment has a basically the same structure as the leaf-cutting blade in Embodiment 2, the difference being:

[0072] Preferably, the relative angle between the inclined forming lines of the four-sided pyramidal working teeth I 6 on the side blade ...

[0073] The materials and manufacturing process used for the leaf-cutting blades are the same as in Example 2.

[0074] The vertical working tooth array on the side blade of Example 4 adopts a medium spacing configuration, which is suitable for the process configuration of the second and third stage blade cutting, and can also be used for the process configuration of the first stage blade cutting where the proportion of large blades is lower.

[0075] In summary, the vertical array of working teeth on the side-side leaf-beating working surface adopts a smaller spacing process configuration, and the corresponding tobacco leaf shape structure after beating will contain a higher proportion of small and medium-sized leaves.

[0076] Example 5: Figure 7 As shown, the leaf-cutting blade in this embodiment has a basically the same structure as the leaf-cutting blade in Embodiment 2, the difference being:

[0077] Preferably, the relative angle between the inclined forming lines of the four-sided pyramidal working teeth I 6 on the side blade ...

[0078] The materials and manufacturing process used for the leaf-cutting blades are the same as in Example 2.

[0079] The vertical working tooth array on the side leaf-cutting working surface of the leaf-cutting knife in Example 5 adopts a small-pitch configuration, which is suitable for the process configuration of the final-stage leaf-cutting that focuses on clearing the stems.

[0080] Example 6: As Figure 8 As shown, a leaf-cutting knife includes a blade body 1. The two sides of the upper part of the blade body 1 are side leaf-cutting working surfaces 2. The side leaf-cutting working surfaces 2 are provided with square pyramidal working teeth I 6, which are distributed in an array. The top surface of the blade body 1 is a top leaf-cutting working surface 3. The top leaf-cutting working surface 3 is provided with square pyramidal working teeth II 7, which are distributed in an array.

[0081] The pin shaft hole 4 and the safety pin hole 5 are arranged on the axis of the threshing knife body 1, the distance between the center of the pin shaft hole 4 and the bottom of the threshing knife body 1 is 1 / 2 of the width of the threshing knife body 1, and the safety pin hole 5 is located directly above the pin shaft hole 4, and the distance between the center of the safety pin hole 5 and the center of the pin shaft hole 4 is 1 / 2 of the width of the threshing knife body 1.

[0082] The length of the side threshing working surface 2 of the threshing knife is 1 / 2-3 / 5 of the total length of the threshing knife body 1 (the total length of the conventional threshing knife body is 177.8 mm).

[0083] Preferably, the relative inclined surface forming line segment angle of the four-prism-shaped working tooth I 6 on the side threshing working surface 2 of the threshing knife is 40°, the working tooth root and the bottom are circularly arc transition, the top of the cone is circularly angle transition, and the height from the top of the cone to the bottom is 3.0 mm; the height direction of the side threshing working surface 2 is the array longitudinal direction, and the interval is 10 mm, in the embodiment, the thickness of the preferred side threshing working surface 2 is 6.3 mm, the thickness direction is the array transverse direction, and the interval is 4.3 mm.

[0084] Preferably, the relative inclined surface forming line segment angle of the four-prism-shaped working tooth II 7 on the top threshing working surface 3 of the threshing knife is 40°, the working tooth root and the bottom are circularly arc transition, the top of the cone is circularly angle transition, and the height from the top of the cone to the bottom is 3 mm. The width direction of the top threshing working surface 3 is the array longitudinal direction, and the interval is 10 mm, in the embodiment, the thickness of the preferred top threshing working surface 3 is 6.3 mm, the thickness direction is the array transverse direction, and the interval is 4.3 mm.

[0085] The four-prism-shaped working tooth I 6 on the side threshing working surface 2 of the threshing knife and the four-prism-shaped working tooth II 7 on the top threshing working surface 3 of the threshing knife are integrally formed with the threshing knife body.

[0086] Preferably, the threshing knife body 1 is made of high chromium alloy steel material 4Cr13.

[0087] The manufacturing method of the threshing knife includes the following specific steps:

[0088] (1) selecting a 4Cr13 alloy steel plate with a thickness of 8 mm;

[0089] (2) according to the preset planar contour of the threshing knife, the blanking is laid out, the bottom hole of the pin shaft hole and the safety pin hole is preformed on the 4Cr13 alloy steel blank plate, the diameter of the bottom hole is smaller than the final forming diameter of the corresponding pin shaft hole and safety pin hole, and the planar contours of 5 threshing knives are arranged on a 4Cr13 alloy steel blank plate with a length of 200 mm and a width of 300 mm.

[0090] (3) quenching and high-temperature tempering heat treatment is performed on the prefabricated 4Cr13 alloy steel blank plate, quenching temperature: 1030 DEG C, holding for 2 hours; first tempering: temperature 580 DEG C; second tempering: temperature 550 DEG C; third tempering: temperature 550 DEG C. Hardness after heat treatment: HRC 40-45;

[0091] (4) plane grinding processing is performed on the upper and lower surfaces of the 4Cr13 alloy steel blank plate after heat treatment, so that it reaches the preset thickness dimension 6.3mm;

[0092] (5) the high-chrome alloy steel blank plate is positioned and fixed on the numerical control electric spark wire cutting machine tool, taking the ground plane, prefabricated pin shaft hole and safety pin hole as the processing reference; according to the planar contour line trajectory of the threshing knife, pin shaft hole, safety pin hole and the planar contour of the knife body are wire-cut formed; according to the contour line trajectory of the side threshing working surface and the top threshing working surface in the thickness direction, the side threshing working surface and the top threshing working surface are respectively wire-cut formed according to the contour line trajectory of the side threshing working surface and the top threshing working surface in the thickness direction, so that the four-pyramid-shaped working teeth distributed on the side threshing working surface and the top threshing working surface are wire-cut formed;

[0093] (6) nitriding treatment is performed on the formed workpiece, so that a nitrided wear-resistant layer with a thickness of 0.20mm and a hardness of HV1200-1350 is formed on the surface of the threshing knife, and the threshing knife is manufactured.

[0094] In order to verify the wear resistance of the threshing working surface of the threshing knife, the applicant of the present application replaces and installs 10 pieces of threshing knives with the same specification as that of example 6 on the first-stage threshing machine of the 12-ton threshing line with the support and cooperation of Yunnan Tobacco Tobacco Leaf Company. After 8 weeks of continuous production operation observation, it is found that the sharpness of the top end of the four-pyramid-shaped working teeth has not changed.

[0095] The beating blade can set the shape structure parameter of the four-pyramid according to the requirement of the beating process, so that the working tooth on the beating surface reaches the optimal convex height and the appropriate sharp degree, and can effectively avoid the covering of tobacco oil; the beating blade body has sufficient strength and toughness, the four-pyramid working tooth on the working surface has high hardness and is not easy to wear, and can maintain the appropriate sharp degree for a long time, so as to ensure the stability of the tearing performance; the beating blade reasonably uses the essential principle of the tearing process, in the process that the tobacco leaves are driven by the moving blade to pass through the fixed blade and the frame at high speed, the four-pyramid working tooth is contacted and relatively moved with the tobacco leaves, the notch effect formed by the four-pyramid working tooth is pierced and cut, so that the tobacco leaves are more effectively separated from the stems and the super large leaves are more effectively split in the subsequent dragging and tearing process; it can be concluded through the process test that the corresponding relationship and the law between the notch spacing size formed by the four-pyramid working tooth on the tobacco leaves and the leaf structure, and the reasonable configuration range of the shape structure and the array parameter of the four-pyramid working tooth is determined according to the corresponding relationship and the law, so that the size control of the tobacco tearing process is realized, and the beating blade type structure is optimized and adjusted, so as to provide an effective solution for realizing the process target of "reducing large and protecting medium" in the tobacco beating and curing industry.

[0096] The specific embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A beater, characterized by: The blade body (1) comprising a threshing knife, the upper two sides of the blade body (1) are side threshing surfaces (2), four pyramid-shaped working teeth I (6) are arranged on the side threshing surfaces (2), the four pyramid-shaped working teeth I (6) are arranged in an array, the top surface of the blade body (1) is a top threshing surface (3), four pyramid-shaped working teeth II (7) are arranged on the top threshing surface (3), the four pyramid-shaped working teeth II (7) are arranged in an array; the relative inclined surface of the four pyramid-shaped working teeth I (6) on the side threshing surface (2) is formed in a line segment with an included angle in the range of 25-35°, the line segment between the root and the bottom of the working tooth is transitioned by an arc, the line of the top of the pyramid is transitioned by a rounded corner, and the height from the top to the bottom is in the range of 2.5-5 mm; the height direction of the side threshing surface (2) is the longitudinal direction of the array, and the interval is in the range of 4-30 mm; the thickness direction of the side threshing surface (2) is the transverse direction of the array, and the interval is in the range of 4-5.5 mm.

2. The beater according to claim 1, wherein: A pin shaft hole (4) and a safety pin hole (5) of the threshing knife are arranged on the axis of the blade body (1), the distance between the center of the pin shaft hole (4) and the bottom of the blade body (1) is 1 / 2 of the width of the blade body (1), the safety pin hole (5) is located directly above the pin shaft hole (4), and the distance between the center of the safety pin hole (5) and the center of the pin shaft hole (4) is 1 / 2 of the width of the blade body (1).

3. The beater according to claim 1, wherein: The length of the side threshing surface (2) is 1 / 2-3 / 5 of the total length of the blade body (1).

4. The beater of claim 1 wherein: The relative inclined surface of the four pyramid-shaped working teeth II (7) on the top threshing surface (3) is formed in a line segment with an included angle in the range of 35-40°, the line segment between the root and the bottom of the working tooth is transitioned by an arc, the line of the top of the pyramid is transitioned by a rounded corner, and the height from the top to the bottom is in the range of 2.5-4 mm; the width direction of the top threshing surface (3) is the longitudinal direction of the array, and the interval is in the range of 4-15 mm; the thickness direction of the top threshing surface (3) is the transverse direction of the array, and the interval is in the range of 4-5.5 mm.

5. The beater of claim 1 wherein: The four pyramid-shaped working teeth I (6) on the side threshing surface (2) and the four pyramid-shaped working teeth II (7) on the top threshing surface (3) are integrally formed with the blade body.

6. The beater according to any one of claims 1 to 5, characterized in that: The blade body (1) of the threshing knife is made of high-chromium alloy steel.

7. A manufacturing method of the threshing knife, and the specific steps are as follows: (1) selecting a high-chromium alloy steel plate with a thickness greater than the preset thickness of the threshing knife; (2) placing and cutting according to the preset planar contour profile of the threshing knife, and preforming the bottom holes of the pin shaft hole and the safety pin hole on the high-chromium alloy steel blank plate, the diameter of the bottom hole is smaller than the final formed diameter of the pin shaft hole and the safety pin hole, and a plurality of planar profiles of the threshing knife can be arranged on one high-chromium alloy steel blank plate; (3) heat treating the preformed high-chromium alloy steel blank plate by quenching and high-temperature tempering to reach the preset hardness value; (4) performing planar grinding processing on the upper and lower surfaces of the high-chromium alloy steel blank plate after heat treatment to reach the preset thickness dimension; (5) On the numerical control wire-cut electric discharge machine, using the ground flat surface, the pre-made pin hole and the safety pin hole as the machining reference, the high-chromium alloy steel blank plate is positioned and fixed; according to the planar contour trajectory of the beater, the pin hole, the safety pin hole and the planar contour of the blade body are successively formed by wire-cutting; then, according to the contour trajectory of the side beating working surface and the top beating working surface in the thickness direction, the side beating working surface and the top beating working surface are respectively formed by orthogonal wire-cut electric discharge, and the four-prism-shaped working teeth distributed in an array on the side beating working surface and the top beating working surface are formed by wire-cut electric discharge; (6) The formed workpiece is subjected to nitriding treatment, and a nitrided wear-resistant layer is formed on the surface of the beater, thereby obtaining the beater.

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