A wire threading device and a wire threading method for manufacturing a threshing concave of a grain harvester

Abstract

A wire threading device for manufacturing a threshing concave of a grain harvester, comprising a base assembly, and a pressing-in assembly, a reciprocating guiding assembly, a top cover assembly and a wire hole positioning assembly arranged on the base assembly. The overall structure of the device is novel, the operation is simple, and it is easy to implement. It can quickly, efficiently and accurately thread multiple steel wires into multiple wire threading holes of a sieve plate at the same time. Moreover, the wire threading process is fast, safe and reliable, which can greatly improve the success rate and threading efficiency of the steel wire passing through the holes on the sieve plate, reduce the difficulty of wire threading, make the manufacturing process of the threshing concave easy to realize automatic production, and has good practical use effects.

Description

Technical Field

[0001] The present invention relates to the technical field of machinery manufacturing, and more specifically, to a wire threading device and a wire threading method for manufacturing a threshing concave plate of a threshing chamber of a grain harvester. Background Art

[0002] The threshing chamber is an important part of a grain harvester, and the threshing concave plate on the threshing chamber is a functional part for threshing of the harvester. Its manufacturing quality and quality stability directly affect the threshing efficiency, threshing clean rate, reliability of the threshing work of the threshing components, and continuous harvesting time of the harvester, and these performance indicators are exactly the measurement criteria for the overall quality of the harvester.

[0003] At present, due to the irregular shape and diverse varieties of the threshing concave plates of grain harvesters (there are 5 - 6 types of concave plates for each model), the wire threading holes on the concave plates are spatially staggered, and the complexity of wire assembly on the threshing concave plates, these unique technological characteristics make it basically only possible to manually thread the wires into the sieve plates during the manufacturing process of threshing concave plates on domestic grain harvesters. This results in extremely low automation in the production of threshing concave plates, and the wire threading needs to be completely completed by manual labor. During the high - yield months, generally many people are required for wire threading operations, causing high labor costs, low production efficiency, and extremely high labor intensity. Improving the efficiency of the production process of threshing concave plates is an urgent problem to be solved currently.

[0004] The threshing concave plate is composed of parts such as a middle partition board, lifting lugs, side plates, sieve plates, rear transverse side plates, wires, front transverse side plates, front sealing plates, etc. Specifically, as shown in the appendix Figure 1 The traditional manufacturing process is as follows: Step 1. First, the middle partition board, side plates, sieve plates, rear transverse side plates, and front transverse side plates are combined and welded to form a sieve plate frame assembly; Step 2. Manually thread the wires into the holes on the sieve plates; Step 3. Weld the two ends of the wires to the two sieve plates at the frontmost and rearmost ends; Step 4. Weld the remaining parts such as lifting lugs and front sealing plates; Step 5. Clean the welding slag and inspect. During the entire manufacturing process, threading multiple wires into multiple sieve plate holes is very inefficient. Generally, many people are required for wire threading operations, causing high labor costs, low production efficiency, and extremely high labor intensity.

[0005] During the process of manually threading the steel wire, multiple factors cause the steel wire to not be able to pass smoothly when passing through the holes on the sieve plate. Factor 1: Since the designed unilateral clearance between the holes on the sieve plate and the steel wire is generally between 0.25 mm and 0.5 mm, and the cut section of the steel wire is an irregular section, the phenomenon of interference between the hole and the steel wire will occur from time to time during perforation; Factor 2: There are more than 20 holes on each sieve plate. Due to the poor manufacturing accuracy of the hole pitch, there is an error between the hole pitches, resulting in the phenomenon that the steel wires are not aligned with the hole positions on the sieve plate when multiple steel wires pass through one sieve plate and then pass through the next sieve plate, thus making the perforation unfavorable; Factor 3: Since the pre-welded frame is arc-shaped and the steel wire has elasticity, it is also easy to cause misalignment between the steel wire and the hole positions on the sieve plate during perforation, resulting in interference during perforation. Due to the above factors, it is impossible to smoothly pass multiple steel wires through multiple sieve plates. Manual correction is often required to complete the perforation operation, and it is difficult to achieve automated production.

[0006] In view of this, during the manufacturing process of the threshing concave plate, how to achieve rapid wire threading of the sieve plate, solve the interference of manpower, and achieve efficient and rapid production has become an urgent problem to be solved. Summary of the Invention

[0007] The technical objective of the present invention is to provide a wire threading device for manufacturing a threshing concave plate of a grain harvester, enabling multiple steel wires to be quickly, efficiently, and accurately inserted into the wire threading holes on the sieve plate, solving the problem that it is difficult for the steel wire to pass through the wire threading holes on the sieve plate in the preparation process of the threshing concave plate, and thus improving the production efficiency of the threshing concave plate.

[0008] To solve the above technical problems, the technical solution adopted by the present invention is: a wire threading device for manufacturing a threshing concave plate of a grain harvester, including a base component, and a pressing component, a reciprocating guiding component, a top cover component, and a wire hole positioning component arranged on the base component. The base component includes a horizontally arranged base plate, a steel wire positioning mechanism I and a sieve plate fixing mechanism arranged on the upper surface of the base plate, and two long columns and two short columns vertically arranged at the four corners of the base plate. The two short columns are arranged on the right side of the base plate, and the two long columns are arranged on the left side of the base plate. A cross beam fixing plate is also horizontally arranged between the tops of the two long columns;

[0009] The pressing component includes two horizontal guide columns, a pressing support, and a positioning support. The two horizontal guide columns are arranged parallel to the front and rear sides of the base plate. The middle of each horizontal guide column is fixed to the lower surface of the base plate through a guiding support. The pressing support for pressing the steel wire to the right is sleeved on the left end of the two horizontal guide columns, and the positioning support for pushing the wire hole positioning component to the left to realize pre-positioning before sieve plate wire threading is sleeved on the right end of the two horizontal guide columns, so that the pressing support, the positioning support, and the two horizontal guide columns together form a rectangular frame structure. Two pressing cylinders are also fixed on the lower surface of the base plate, respectively used to drive the pressing support and the positioning support to slide left and right on the horizontal guide columns;

[0010] The top cover assembly described above includes a lifting cylinder, a top cover, and a wire positioning mechanism II provided on the lower surface of the top cover. The lifting cylinder is fixed on the crossbeam fixing plate, and the end of its piston rod is connected to the upper part of the top cover. The wire positioning mechanism II is fixed on the lower surface of the top cover and can cooperate with the wire positioning mechanism I on the substrate to realize the positioning and guiding of multiple wires to be threaded on the substrate.

[0011] The wire hole positioning assembly described above includes a return plate, a link mechanism, and multiple floating positioning units. The return plate is movably connected to the lower surface of the substrate. One end of the link mechanism is rotatably connected to the substrate, and the other end is rotatably connected to the positioning support. The central rotating shaft in the middle of the link mechanism is fixed on the return plate, enabling the link mechanism to drive the return plate to move up and down relative to the substrate. The multiple floating positioning units are arranged at intervals in the front and back on the rightmost side of the substrate, and the number of floating positioning units is the same as the number of wires to be threaded on each sieve plate in the finished threshing concave plate. Each floating positioning unit includes an upper positioning block, a lower positioning block, a positioning rod, and a lower floating mechanism. Among them, the lower floating mechanism is fixed on the return plate and penetrates through the substrate, enabling the lower floating mechanism to move up and down relative to the substrate under the drive of the link mechanism and the return plate. The upper positioning block is movably connected to the top cover, the lower positioning block is placed on the lower floating mechanism, and a groove for placing the sieve plate is provided on the lower positioning block. A wire through hole for the wire to penetrate is provided on the upper positioning block and the lower positioning block on the left side of the groove. The positioning of the wire through hole is realized through the up and down floating of the upper positioning block relative to the top cover and the up and down floating of the lower positioning block along with the lower floating mechanism. A horizontal through hole for the positioning rod to penetrate is provided on the lower positioning block on the right side of the groove. The positioning rod, under the push of the positioning support on its right side, sequentially penetrates through the wire through holes on the sieve plate and the wire through hole between the upper positioning block and the lower positioning block, realizing the floating positioning between the wire through holes on the sieve plate and the wires on the substrate.

[0012] The reciprocating guiding assembly described above includes a bottom plate mechanism horizontally arranged on the base assembly, a lifting mechanism installed on the bottom plate mechanism, and a wire support unit and a sieve plate support unit provided at the top end of the lifting mechanism. The wire support unit for supporting the wire and the sieve plate support unit for supporting the sieve plate can both move up and down along with the lifting mechanism and can move left and right along with the bottom plate mechanism, thereby realizing the working position transfer of the sieve plate and the wire after the sieve plate is threaded with wires.

[0013] Further, the wire positioning mechanism I includes multiple wire guiding plates and multiple wire positioning plates fixed on the substrate, and the sieve plate fixing mechanism includes multiple sieve plate fixing seats arranged at intervals left and right.

[0014] Further, a cylinder fixing seat for installing two pressing cylinders is also provided at the center of the lower surface of the substrate.

[0015] Furthermore, the number of the link mechanisms is two sets, and the two sets of link mechanisms are respectively arranged on the front side and the rear side of the substrate. Each set of link mechanism includes two return links sleeved on the central rotating shaft, a bearing and a locking nut. The bearing is fixed on the return plate, and the end of the link mechanism is rotationally connected to the positioning support or the side surface of the substrate through a fixed pin shaft.

[0016] Furthermore, a limit pin is fixed on the lower surface of the top cover, and a pin hole for cooperating with the limit pin is arranged on the upper positioning block. An internal hexagonal screw is also fixed on the upper positioning block. The top end of the internal hexagonal screw is located inside the top cover and can move up and down. A return spring II is sleeved on the middle part of the internal hexagonal screw. The return spring II is placed in a counterbore preset on the lower surface of the top cover. The expansion and contraction of the return spring II and the up and down movement of the internal hexagonal screw realize the up and down floating of the upper positioning block relative to the top cover.

[0017] Furthermore, the lower floating mechanism includes two vertically arranged floating rods. The lower ends of the floating rods are fixed on the return plate, and their upper ends extend out of the upper surface of the substrate by a certain height after passing through the mounting holes preset on the substrate. A spring is sleeved on the floating rods in the mounting holes, and a fixed screw sleeve for preventing the floating rods from coming out of the substrate is also arranged at the lower part of the mounting holes. The lower positioning block is sleeved on the top ends of the floating rods. The link mechanism drives the up and down movement of the return plate and the floating rods to realize the up and down floating of the lower positioning block relative to the substrate.

[0018] Furthermore, the right end of the positioning rod abuts against the positioning support. A return spring III is sleeved on the part of the positioning rod located on the right side of the lower positioning block. A locking screw for preventing the positioning rod from coming out of the horizontal through hole of the lower positioning block is also arranged on the lower positioning block. An anti - detachment card slot for cooperating with the locking screw is arranged on the positioning rod. A pressure rod is also arranged between the lower positioning block and the positioning support. The pressure rod is horizontally arranged. One end of the pressure rod is fixed on the lower positioning block, and the other end is inserted into a through hole preset on the positioning support after being sleeved with a return spring IV. The pressure rod extends out of the positioning support by a certain length, and an anti - detachment nut is fixed at the extending end.

[0019] Furthermore, the top cover is sleeved on two long columns and two short columns and can move up and down along the two long columns and the two short columns under the drive of a lifting cylinder. The wire positioning mechanism II includes a plurality of upper guide plates, a positioning plate I and a positioning plate II fixed on the lower surface of the top cover.

[0020] Further, the bottom plate mechanism includes a horizontally arranged bottom plate, a horizontal cylinder, a long support rod seat erected between two long vertical columns, two short support seats respectively installed on two short vertical columns, and two parallel guide rods. The two ends of the long support rod seat are respectively connected to a short support seat through a guide rod, so that the long support rod seat and the two guide rods form three sides of a horizontally arranged rectangular frame structure. A bottom plate guide seat is sleeved on each guide rod, and the bottom plate guide seat is fixedly connected to the bottom plate. The horizontal cylinder is fixed in the middle of the long support rod seat, and the end of its piston rod is connected to the left end of the bottom plate, so that the horizontal cylinder can drive the bottom plate to slide left and right on the two guide rods;

[0021] The lifting mechanism includes a vertical cylinder, a horizontally arranged lifting plate, four vertical guide posts fixed on the bottom plate, and four guide sleeves installed on the lifting plate. The vertical cylinder is fixed on the bottom plate, and the end of its piston rod is connected to the lifting plate above the bottom plate. The four guide sleeves are vertically fixed in four guide sleeve holes corresponding to the four vertical guide posts on the lifting plate. The four vertical guide posts are respectively inserted into the four guide sleeves one by one, and the top ends of the vertical guide posts extend out of the lifting plate by a certain height. The vertical cylinder can drive the lifting plate and the four guide sleeves to slide up and down on the four vertical guide posts;

[0022] Both the wire support unit and the sieve plate support unit are fixed on the upper surface of the lifting plate. The wire support unit includes a spring wire support block fixed at the left end of the lifting plate, and the sieve plate support unit includes a sieve plate support block and a transition block fixed in sequence from top to bottom at the right end of the lifting plate.

[0023] A wire threading method for manufacturing a threshing concave plate of a grain harvester includes the following steps:

[0024] Step 1: Place multiple wires to be threaded on the wire positioning mechanism I of the base component;

[0025] Step 2: Place a sieve plate to be threaded into the groove of the lower positioning block in the wire hole positioning component, and make the side of the sieve plate flush with the boundary of the groove;

[0026] Step 3: Start the lifting cylinder in the top cover component to drive the top cover to move downward until the upper positioning block and the lower positioning block in the wire hole positioning component are about to be in contact. At this time, the lifting cylinder stops operating, and the wire positioning mechanism II in the top cover component cooperates with the wire positioning mechanism I in the base component to jointly position the multiple wires to be threaded on the base plate;

[0027] Step 4: Start the pressing cylinder in the pressing component that is connected to the positioning support, and make it drive the positioning support to move leftward. During this process, the linkage mechanism in the wire hole positioning component drives the lower floating mechanism and the lower positioning block to float up and down, so that the wire through hole between the upper positioning block and the lower positioning block is accurately aligned with the wire threading hole on the sieve plate. The positioning support pushes the positioning rod to sequentially pass through the wire threading hole and the wire through hole via the horizontal through hole on the lower positioning block. At this time, the pressing cylinder stops operating. Then, start the lifting cylinder in the top cover component again to drive the top cover and the upper positioning block to move downward until they are completely pressed between the upper positioning block and the lower positioning block. After that, start the pressing cylinder connected to the positioning support again to drive the positioning support to move rightward, so that the positioning rod is withdrawn from the wire threading hole and the wire through hole, completing the wire hole positioning before wire threading of the sieve plate;

[0028] Step 5: Start the pressing cylinder in the pressing component that is connected to the pressing support, and make it drive the pressing support to move rightward. The pressing support pushes multiple wires to be threaded on the substrate to sequentially pass through the wire through hole between the upper positioning block and the lower positioning block and the wire threading hole on the sieve plate, completing the wire threading process of one sieve plate;

[0029] Step 6: Start the lifting cylinder in the top cover component to drive the top cover and the upper positioning block to return upward to the initial position, and start the pressing cylinder connected to the positioning support in the pressing component to drive the positioning support to return rightward to the initial position;

[0030] Step 7: Control the lifting mechanism in the reciprocating guiding component to drive the sieve plate supporting unit and the wire supporting unit to lift the sieve plate and the wire that have completed wire threading upward by a certain height. Then, control the bottom plate mechanism to drive the lifting mechanism, the sieve plate supporting unit, the wire supporting unit, and the sieve plate and the wire that have completed wire threading to move leftward by one working position. Then, control the lifting mechanism to drive the sieve plate supporting unit, the wire supporting unit, and the sieve plate and the wire that have completed wire threading to move downward, so that the sieve plate and the wire that have completed wire threading fall back onto the sieve plate positioning mechanism and the wire positioning mechanism I in the base component. After that, control the bottom plate mechanism to drive the lifting mechanism, the sieve plate supporting unit, and the wire supporting unit to move rightward by one working position, so that the entire reciprocating guiding component returns to the initial position;

[0031] Step 8: Take another sieve plate to be threaded and repeat the operations in Steps 2 to 7 above until all the sieve plates on the entire threshing concave plate have completed wire threading.

[0032] Advantages of the present invention:

[0033] 1. A wire threading device for manufacturing the threshing concave of a grain harvester according to the present invention has a novel structure, is easy to operate and implement, can quickly, efficiently and accurately thread multiple steel wires into multiple wire threading holes of a sieve plate at the same time, and the wire threading process is fast, safe and reliable, which can greatly improve the success rate and efficiency of the steel wire passing through the holes on the sieve plate, reduce the wire threading difficulty, make the manufacturing process of the threshing concave easy to realize automated production, and has good practical use effects.

[0034] 2. A wire threading device for manufacturing the threshing concave of a grain harvester according to the present invention has a wire hole positioning component in the device, so that the wire threading holes on the sieve plate can be concentric with the multiple holes on the positioning block during wire threading installation when they are inconsistent due to manufacturing errors, laying a good foundation for the accurate wire threading of multiple steel wires subsequently.

[0035] 3. A wire threading device for manufacturing the threshing concave of a grain harvester according to the present invention has multiple guiding structures in the device, so that the movement precision problems of multiple movable components in the device can be effectively solved, thereby effectively avoiding wire threading errors caused by the overall precision problems of the components, and then improving the stability and reliability of wire threading. And due to the setting of multiple guiding structures, the assembly process between multiple components is more quick, safe and reliable. Therefore, the production efficiency of the threshing concave is improved, and the whole wire threading process is time-saving, labor-saving and efficient.

[0036] 4. A wire threading method for manufacturing the threshing concave of a grain harvester according to the present invention has simple steps and is easy to operate, can realize automated production in the manufacturing process of the threshing concave, the method itself is efficient and convenient, can effectively reduce manual errors, greatly improve the wire threading efficiency, thereby reducing the production cycle of the product, reducing the labor intensity of operators, and having good application effects. Description of the Drawings

[0037] Figure 1 It is a schematic structural diagram of the finished threshing concave;

[0038] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0039] Figure 3 It is a schematic structural diagram of the base component in the present invention;

[0040] Figure 4 It is a schematic top view of the structure of the base component in the present invention;

[0041] Figure 5 It is a schematic structural diagram of the pressing-in component in the present invention;

[0042] Figure 6 For Figure 5 A - A sectional view;

[0043] Figure 7 Structural schematic diagram of the reciprocating guiding component in the present invention;

[0044] Figure 8 is Figure 7 Cross-sectional view taken along line B-B of ;

[0045] Figure 9 Structural schematic diagram of the wire hole positioning component in the present invention;

[0046] Figure 10 Exploded structural schematic diagram of the wire hole positioning component in the present invention;

[0047] Figure 11 Structural schematic diagram of the top cover component in the present invention;

[0048] Figure 12 is Figure 11 Top view of ;

[0049] Reference numerals: 1, middle partition board; 2, lifting lug; 3, side board; 4, sieve plate; 5, rear transverse side board; 6, steel wire; 7, front transverse side board; 8, front sealing plate; 9, press-in component; 10, reciprocating guiding component; 11, top cover component; 12, wire hole positioning component; 13, long vertical column; 14, base plate; 15, cross beam fixing plate; 16, base body component; 17, steel wire guiding plate; 18, steel wire positioning plate; 19, sieve plate fixing seat; 20, short vertical column; 21, cylinder fixing seat; 22, horizontal guide post; 23, press-in support; 24, fixing bolt; 25, guiding support; 26, pressing cylinder; 27, positioning support; 28, stud bolt; 29, fixing nut; 30, horizontal cylinder; 31, spring steel wire support block; 32, hexagon socket head cap screw; 33, vertical guide post; 34, sieve plate support block; 35, transition block; 36, guide sleeve; 37, bottom plate; 38, vertical cylinder; 39, bottom plate guiding seat; 40, guiding rod; 41, long support rod seat; 42, short bolt; 44, short support seat; 45, lifting plate; 46, return plate; 47, fixing sleeve; 48, spring; 49, floating rod; 50, lower positioning block; 51, upper positioning block; 52, limit pin; 53, return spring II; 54, hexagon socket head cap screw; 55, locking screw; 56, return spring III; 57, positioning rod; 58, anti-loosening nut; 59, pressing rod; 60, return spring IV; 61, return connecting rod; 62, fixing pin shaft; 63, central rotating shaft; 64, locking nut; 65, bearing; 66, top cover; 67, lifting cylinder; 68, upper guiding plate; 69, positioning plate I; 70, positioning plate II. Detailed implementation manners

[0050] The following further describes the present invention in detail with reference to the accompanying drawings, so that those skilled in the art can implement it according to the description in the specification. It should be noted that although the implementation steps of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

[0051] The object of the present invention is to provide a wire threading device for manufacturing the threshing concave of a grain harvester, to solve the problem of difficult wire threading into the sieve plate holes during the "new process for manufacturing sieve plates"; in addition, the device has a novel structure, a simple method, and is fast, safe, reliable, time-saving, labor-saving, efficient, and easy to implement, and has a good use effect.

[0052] The specific structure of the wire threading device for manufacturing the threshing concave of a grain harvester is as follows: it includes a base component 16, and a pressing component 9, a reciprocating guiding component 10, a top cover component 11, and a wire hole positioning component 12 arranged on the base component. Among them, on the base component 16, the pressing component 9, the wire hole positioning component 12, and the top cover component 11 are fixedly connected, that is, a "component fixedly connected whole" is formed.

[0053] The base component 16 includes a horizontally arranged base plate 14, a wire positioning mechanism I and a sieve plate fixing mechanism arranged on the upper surface of the base plate 14, and two long columns 13 and two short columns 20 vertically arranged at the four corners of the base plate 14. The two short columns 20 are arranged through the right side of the base plate 14, and the two long columns 13 are arranged through the left side of the base plate 14. A cross beam fixing plate 15 is also horizontally arranged between the tops of the two long columns 13; the wire positioning mechanism I includes a plurality of wire guiding plates 17 and a plurality of wire positioning plates 18 fixed on the base plate 14, the sieve plate fixing mechanism includes a plurality of sieve plate fixing seats 19 arranged at intervals left and right, and a cylinder fixing seat 21 for installing two pressing cylinders 26 is also arranged at the center of the lower surface of the base plate 14.

[0054] That is, the base component 16 includes a base plate 14, a wire guiding plate 17, a wire positioning plate 18, a sieve plate fixing seat 19, a cylinder fixing seat 21, a cross beam fixing plate 15, a long column 13, and a short column 20; on the base plate 14, there are column installation holes, wire hole positioning component 12 installation holes, sieve plate fixing seat 19 installation holes, wire positioning plate 18 installation holes, wire guiding plate 17 installation holes, etc.; a cylinder fixing seat 21 is arranged at the middle position of the lower surface of the base plate 14, and cylinder installation screw holes are designed on the cylinder fixing seat 21; on the front and rear side edges of the base plate 14, guiding support 25 installation threaded holes are arranged. Among them, the column installation holes have parallelism requirements; the long column 13 and the short column 20 are respectively installed in the front and rear column installation holes of the base plate 14, and the long column 13 is fastened to the cross beam fixing plate 15 through bolts on the upper surface.

[0055] The described press-in component 9 includes two horizontal guide columns 22, a press-in support 23, and a positioning support 27. The two horizontal guide columns 22 are arranged parallel to the front and rear sides of the substrate 14. The middle of each horizontal guide column 22 is fixed to the lower surface of the substrate 14 through a guide support 25. The press-in support 23 for pressing the steel wire to the right is sleeved on the left end of the two horizontal guide columns 22. The positioning support 27 for pushing the wire hole positioning component 12 to the left to achieve pre-positioning before wire threading of the sieve plate is sleeved on the right end of the two horizontal guide columns 22. Thus, the press-in support 23, the positioning support 27, and the two horizontal guide columns 22 together form a rectangular frame structure. On the lower surface of the substrate 14, two pressing cylinders 26 are also fixed, which are respectively used to drive the press-in support 23 and the positioning support 27 to slide left and right on the horizontal guide columns 22.

[0056] That is, the described press-in component 9 includes: two horizontal guide columns 22, a press-in support 23, multiple fixing bolts 24, two guide supports 25, two pressing cylinders 26, a positioning support 27, a stud 28, and a fixing nut 29. Among them, first, insert a horizontal guide column 22 into the guide hole of a guide support 25, and then connect the guide support 25 to the lower surface of the substrate 14 of the base component 16 through the fixing bolt 24. The fixing bolt 24 is screwed in and pre-tightened. Then, insert another horizontal guide column 22 into the guide hole of another guide support 25, and then also connect the guide support 25 to the lower surface of the base component substrate 14 through the fixing bolt 24. The fixing bolt 24 is screwed in and pre-tightened. Take the press-in support 23 and insert its two guide holes respectively onto the two horizontal guide columns 22. Then take the positioning support 27 and insert its two guide holes respectively onto the two horizontal guide columns 22. Then adjust the press-in support 23 and the positioning support 27 to slide smoothly on the horizontal guide columns 22 without blockage, and then tighten the fixing bolt 24 of the guide support 25. Fix the fixed ends of the two pressing cylinders 26 to the two planes on the left and right sides of the cylinder fixing seat 21 arranged below the substrate 14 in the base component 16 through bolts, fasten them to the cylinder fixing seat 21 through the stud 28, and lock the fixing nut 29. The piston rod end of one pressing cylinder 26 is screwed into the cylinder connection screw hole on the press-in support 23 with the threaded end on the piston cylinder, and the piston rod end of the other pressing cylinder 26 is screwed into the cylinder connection screw hole on the positioning support 27 with the threaded end on the piston cylinder.

[0057] The described top cover assembly 11 includes a lifting cylinder 67, a top cover 66, and a wire positioning mechanism II provided on the lower surface of the top cover 66. The lifting cylinder 67 is fixed on the crossbeam fixing plate 15, and the end of its piston rod is connected to the upper part of the top cover 66. The top cover 66 is sleeved on two long columns 13 and two short columns 20, and can move up and down along the two long columns 13 and the two short columns 20 driven by the lifting cylinder 67. The wire positioning mechanism II is fixed on the lower surface of the top cover 66. The wire positioning mechanism II includes a plurality of upper guide plates 70, a positioning plate I 71, and a positioning plate II 72 fixed on the lower surface of the top cover 66. The wire positioning mechanism II can cooperate with the wire positioning mechanism I on the substrate 14 to realize the positioning and guiding of multiple wires to be threaded on the substrate 14;

[0058] That is, the described top cover assembly 11 includes: a top cover 66, a lifting cylinder 67, a fixing nut 29, an internal hexagonal bolt 32, an upper guide plate 68, a positioning plate I 69, and a positioning plate II 70. The lifting cylinder 67 is fixed on the lower plane K of the crossbeam fixing plate 15 in the base assembly 16 through the internal hexagonal bolt 32 and the fixing nut 29. Take the upper guide plate 68, the positioning plate I 69, and the positioning plate II 70, and fix them on the lower plane of the top cover 66 by bolt connection to form a "top cover fixed connection assembly". Then, sleeved the assembled "top cover fixed connection assembly" onto the four columns in the base assembly 16 through the guide holes on the top cover 66. Then, fix the crossbeam fixing plate 15 with the lifting cylinder 67 at the top of the long column 13 by bolt connection, and then connect the lower end of the piston rod of the lifting cylinder 67 to the top cover 66.

[0059] The described wire hole positioning assembly 12 includes a return plate 46, a link mechanism, and a plurality of floating positioning units. The return plate 46 is movably connected to the lower surface of the base plate 14. One end of the link mechanism is rotatably connected to the base plate 14, and the other end is rotatably connected to the positioning support 27. The central rotating shaft 63 in the middle of the link mechanism is fixed on the return plate 46, enabling the link mechanism to drive the return plate 46 to move up and down relative to the base plate 14. The number of the link mechanisms is two sets, and the two sets of link mechanisms are respectively arranged on the front side and the rear side of the base plate 14. Each set of link mechanisms includes two return links 61 sleeved on the central rotating shaft 63, a bearing 65, and a locking nut 64. The bearing 65 is fixed on the return plate 46. The end of the link mechanism is rotatably connected to the positioning support 27 or the side surface of the base plate 14 through a fixed pin shaft 62. A plurality of floating positioning units are arranged at intervals in the front and rear directions on the rightmost side of the base plate 14, and the number of the floating positioning units is the same as the number of steel wires to be inserted into each sieve plate in the finished threshing concave plate. Each floating positioning unit includes an upper positioning block 51, a lower positioning block 50, a positioning rod 57, and a lower floating mechanism. Among them, the lower floating mechanism is fixed on the return plate 46 and penetrates through the base plate 14. During operation, the left-right movement of the positioning support 27 drives the link mechanism to make the return plate 46 move up and down relative to the base plate 14. The described lower floating mechanism includes two vertically arranged floating rods 49. The lower ends of the floating rods 49 are fixed on the return plate 46, and their upper ends extend out of the upper surface of the base plate 14 by a certain height after passing through the preset mounting holes on the base plate 14. A spring 48 is sleeved on the floating rod 49 in the mounting hole, and a fixed screw sleeve 47 for preventing the floating rod 49 from disengaging from the base plate 14 is also arranged at the lower part of the mounting hole. The lower positioning block 50 is sleeved on the top end of the floating rod 49. The link mechanism drives the up and down movement of the return plate 46 and the floating rod 49 to realize the up and down floating of the lower positioning block 50 relative to the base plate 14. The upper positioning block 51 is movably connected to the top cover 66. A limit pin 52 is fixed on the lower surface of the top cover 66. A pin hole for cooperating with the limit pin 52 is arranged on the upper positioning block 51. An internal hexagonal screw 54 is also fixed on the upper positioning block 51. The top end of the internal hexagonal screw 54 is placed inside the top cover 66 and can move up and down. A return spring II 53 is sleeved on the middle part of the internal hexagonal screw 54. The return spring II 53 is placed in a counterbore preset on the lower surface of the top cover 66. The telescoping of the return spring II 53 and the up and down movement of the internal hexagonal screw 54 realize the up and down floating of the upper positioning block 51 relative to the top cover 66. The lower positioning block 50 is placed on the lower floating mechanism, and a pressure rod 59 connected to the positioning support 27 enables it to move within a small range on the base plate 14 without being able to disengage;A groove for placing a sieve plate is provided on the lower positioning block 50. A wire through-hole for the wire to pass through is provided at the joint surface of the upper positioning block 51 and the lower positioning block 50. Half of this wire through-hole is on the upper positioning block 51 and half is on the lower positioning block 50. The positioning of the wire through-hole with the wire-passing hole on the sieve plate is achieved through the up-and-down floating of the upper positioning block 51 and the lower positioning block 50 and the up-and-down floating along with the lower floating mechanism. Wire through-holes for the wire to pass through are provided on the upper positioning block 51 and the lower positioning block 50 on the left side of the groove. The positioning of these wire through-holes is achieved through the up-and-down floating of the upper positioning block 51 relative to the top cover 66 and the up-and-down floating of the lower positioning block 50 along with the lower floating mechanism. A horizontal through-hole for passing a positioning rod 57 is provided on the lower positioning block 50 on the right side of the groove. The right end of the positioning rod 57 abuts against the positioning support 27. A return spring III 56 is sleeved on the part of the positioning rod 57 on the right side of the lower positioning block 50. A locking screw 55 for preventing the positioning rod 57 from slipping out of the horizontal through-hole of the lower positioning block 50 is also provided on the lower positioning block 50. An anti-slip-off groove for cooperating with the locking screw 55 is provided on the positioning rod 57. A pressure rod 59 is also provided between the lower positioning block 50 and the positioning support 27. The pressure rod 59 is horizontally arranged. One end of the pressure rod 59 is fixed to the lower positioning block 50, and the other end is inserted into a preset through-hole on the positioning support 27 after being sleeved with a return spring IV 60. The pressure rod 59 extends out of the positioning support 27 by a certain length, and an anti-slip-off nut 58 is fixed at the extended end. The positioning rod 57, under the push of the positioning support 27 on its right side, sequentially passes through the wire-passing hole on the sieve plate and the wire through-hole between the upper positioning block 51 and the lower positioning block 50, realizing the floating positioning between the wire-passing hole on the sieve plate and the wire on the substrate 14. When the positioning support 27 moves to the left, the return spring III 56 on the positioning rod 57 also moves to the left. After the positioning rod 57 passes through the wire-passing hole on the sieve plate, the concentricity of the wire-passing hole on the sieve plate and the wire through-holes on the upper and lower positioning blocks is achieved through the floating of the lower positioning block 50. At the same time, the upper positioning block 51 presses down to finally achieve the positioning of the wire-passing hole on the sieve plate. When the positioning support 27 moves to the right, the positioning rod 57 is disengaged from the wire-passing hole on the sieve plate by the return spring III 56, and the wire also passes through the wire-passing hole on the sieve plate from the wire through-holes on the upper and lower positioning blocks, finally completing the work of positioning and perforation.

[0060] That is, the wire hole positioning assembly 12 is composed of a return plate 46, a link mechanism and a plurality of floating positioning units. The number of "floating positioning units" is the same as the number of wires to be press-fitted on each sieve plate of the finished threshing concave plate. When assembling each group of floating positioning units, a limit pin 52 is driven into the pin hole on the lower surface of the top cover 66 in the top cover assembly 11, and then the return spring II 53 is placed into the counterbore on the lower surface of the top cover 66 in the top cover assembly 11. Then, the upper positioning block 51 is connected to the lower surface of the top cover 66 in the top cover assembly 11 through an internal hexagonal bolt 54. After the positioning rod 57 is loaded with the return spring III 56, it is inserted into the horizontal through hole on the right side surface of the lower positioning block 50, and then a locking screw 55 is screwed into the lower positioning block 50 to prevent the positioning rod 57 from disengaging from the lower positioning block 50. Finally, after the return spring IV 60 is loaded on the pressure rod 59, it is inserted into the through hole on the left end surface of the positioning support 27, and then an anti-loosening nut 58 is screwed onto the threaded end at the rightmost part of the pressure rod 59. The left end of the pressure rod 59 is screwed into the threaded hole on the right side of the lower positioning block 50, thus forming a set of "floating positioning units". A bearing 65 and a return link 61 are put on the central rotating shaft 63, and then another return link 61 is put on the central rotating shaft 63. Then, a locking nut 64 is screwed onto the thread of the central rotating shaft 63 and tightened, thus forming a set of "link mechanism". The two sets of "link mechanisms" are respectively installed on the front and rear sides of the base assembly 16. One end of the "link mechanism" is connected to the base plate 14 in the base assembly through a fixed pin shaft 62, and the other end is connected to the positioning support 27 in the pressing assembly 9 through a fixed pin shaft 62. The return link 61 can have a sliding and rotating movement relationship with the fixed pin shaft 49. When the positioning support 27 approaches the base assembly 16, the link mechanism contracts, causing the return plate 46 to move downward.

[0061] The reciprocating guiding assembly described above includes a bottom plate mechanism horizontally arranged on the base assembly 16, a lifting mechanism mounted on the bottom plate mechanism, and a wire support unit and a sieve plate support unit provided at the top of the lifting mechanism. The wire support unit for supporting the wire and the sieve plate support unit for supporting the sieve plate can both move up and down with the lifting mechanism and can move left and right with the bottom plate mechanism, so as to realize the working position transfer of the sieve plate and the wire after the wire is passed through the sieve plate. The bottom plate mechanism includes a horizontally arranged bottom plate 37, a horizontal cylinder 30, a long support rod seat 41 erected between two long vertical columns 13, two short support seats 44 respectively mounted on two short vertical columns 20, and two parallel guide rods 40. The two ends of the long support rod seat 41 are respectively connected to a short support seat 44 through a guide rod 40, so that the long support rod seat 41 and the two guide rods 40 form three sides of a horizontally arranged rectangular frame structure. A bottom plate guide seat 39 is sleeved on each guide rod 40, and the bottom plate guide seat 39 is fixedly connected to the bottom plate 37. The horizontal cylinder 30 is fixed in the middle of the long support rod seat 41, and the end of its piston rod is connected to the left end of the bottom plate 37, so that the horizontal cylinder 30 can drive the bottom plate 37 to slide left and right on the two guide rods 40. The lifting mechanism includes a vertical cylinder 38, a horizontally arranged lifting plate 45, four vertical guide columns 33 fixed on the bottom plate 37, and four guide sleeves 36 mounted on the lifting plate 45. The vertical cylinder 38 is fixed on the bottom plate 37, and the end of its piston rod is connected to the lifting plate 45 above the bottom plate 37. The four guide sleeves 36 are vertically fixed in four guide sleeve holes corresponding to the four vertical guide columns 33 on the lifting plate 45. The four vertical guide columns 33 are respectively inserted into the four guide sleeves 36, and the top ends of the vertical guide columns 33 extend out of the lifting plate 45 by a certain height. The vertical cylinder 38 can drive the lifting plate 45 and the four guide sleeves 36 to slide up and down on the four vertical guide columns 33. The wire support unit and the sieve plate support unit are both fixed on the upper surface of the lifting plate 45. The wire support unit includes a spring wire support block 31 fixed on the left end of the lifting plate 45. The sieve plate support unit includes a sieve plate support block 34 and a transition block 35 fixedly arranged in sequence from top to bottom on the right end of the lifting plate 45.

[0062] That is, the reciprocating guiding assembly 10 includes: a horizontal cylinder 30, two vertical cylinders 38, a spring wire support block 31, an internal hexagonal bolt 32, four vertical guide posts 33, a sieve plate support block 34, a transition block 35, four guide sleeves 36, a bottom plate 37, two bottom plate guiding seats 39, two guiding rods 40, a long support rod seat 41, a short bolt 42, two short support seats 44, and a lifting plate 45. Among them, the long support rod seat 41 is pre-tightened with the long upright column 13 in the base assembly 16 through the short bolt 42, and then the two short support seats 44 are pre-tightened with the short upright columns 20 on the base assembly 16 through the short bolt 42. The two bottom plate guiding seats 39 are respectively put on the two horizontally arranged guiding rods 40, and then the two guiding rods 40 with the bottom plate guiding seats 39 put on are respectively inserted into the guiding holes on both sides of the long support rod seat 41 and the guiding holes of the two short support seats 44 installed on the left and right short upright columns 20 for standby. Take two vertical cylinders 38 and vertically install them on the bottom plate 37 through the upper surface W surface. The piston rod ends of the two vertical cylinders 38 are connected to the lifting plate 45, so that the vertical cylinders 38 can drive the lifting plate 45 to move up and down relative to the bottom plate 37. Then take four vertical guide posts 33 and install them into the guide post holes of the bottom plate 37 from the W surface, ensuring that the vertical guide posts 33 are perpendicular to the W surface of the bottom plate 37. Take the internal hexagonal bolt 32 to fasten the sieve plate support block 34 and the transition block 35 to the lifting plate 45, and then press-fit the four guide sleeves 36 into the guide sleeve holes from the lower plane S of the lifting plate 45, ensuring that the axis of the guide sleeve 36 is perpendicular to the S surface of the lifting plate 45, thus forming a "lifting plate assembly". Insert the guide sleeves 36 of the assembled "lifting plate assembly" onto the vertical guide posts 33 perpendicular to the W surface of the bottom plate 37 along the direction of the four vertical guide posts 33, ensuring that the guide sleeves 36 and the vertical guide posts 33 can slide freely without jamming, thus forming a "bottom plate assembly". Then connect the two sides of the bottom plate 37 on the "bottom plate assembly" to the two side bottom plate guiding seats 39 through internal hexagonal screws 54 and pre-tighten them. Then adjust the "lifting plate assembly" to slide freely on the vertical guide posts 33 without jamming. During the tightening process, pre-tighten the internal hexagonal screws 54. The two vertical cylinders 38 on the bottom plate 37 can drive the "lifting plate assembly" to move up and down on the vertical guide posts 33. Another horizontal cylinder 30 is installed on the long support rod seat 41, and its piston rod end is connected to the left end of the bottom plate 37. This horizontal cylinder 30 is used to drive the bottom plate 37 and all the components connected above it to move left and right on the guiding rods 40.

[0063] A wire threading method for manufacturing a threshing concave plate of a grain harvester includes the following steps:

[0064] Step 1: Place multiple wires to be threaded on the wire positioning mechanism I of the base assembly 16;

[0065] Step 2: Place a wire-piercing sieve plate in the groove of the lower positioning block 50 in the wire hole positioning assembly 12, and align the side of the sieve plate with the boundary of the groove, i.e., perform preliminary positioning using the side of the sieve plate.

[0066] Step 3: Start the lifting cylinder 67 in the top cover assembly 11 to drive the top cover 66 to move downward until the upper positioning block 51 and the lower positioning block 50 in the wire hole positioning assembly 12 are about to be in contact. At this time, the lifting cylinder 67 stops operating, and the return spring II 53 on the upper positioning block 51 plays a supporting role, so that the upper positioning block 51 and the lower positioning block 50 cannot move freely under the action of elastic force. The wire positioning mechanism II in the top cover assembly 11 cooperates with the wire positioning mechanism I in the base assembly 16 to jointly position multiple wires to be pierced on the substrate 14.

[0067] Step 4: Start the pressing cylinder 26 connected to the positioning support 27 in the pressing assembly 9 to drive the positioning support 27 to move leftward. The positioning support 27 gradually approaches the upper positioning block 51 and the lower positioning block 50 in the wire hole positioning assembly 12. During this process, as the positioning support 27 moves, the linkage mechanism in the wire hole positioning assembly 12 drives the lower floating mechanism and the lower positioning block 50 to be disengaged from the positioning and can float up and down. At the same time, the positioning support 27 pushes the positioning rod 57 to pass through the wire-piercing hole and the wire through-hole on the sieve plate in sequence through the horizontal through-hole on the lower positioning block 50, so that the wire through-holes on the upper positioning block 51 and the lower positioning block 50 are precisely aligned with the wire-piercing holes on the sieve plate. At this time, the pressing cylinder 26 stops operating, and the positioning support 27 stops moving. Start the lifting cylinder 67 in the top cover assembly 11 again to drive the top cover 66 and the upper positioning block 51 to continue pressing down until the upper positioning block 51 and the lower positioning block 50 are completely pressed and cannot move. After that, start the pressing cylinder 26 connected to the positioning support 27 again to drive the positioning support 27 to move rightward to disengage the positioning rod 57 from the positioning state, but the pressing rod 59 still plays a role in pressing the sieve plate to prevent the sieve plate from moving in the positioning state. At this time, the positioning support 27 stops moving, and the wire hole positioning before the wire piercing of the sieve plate is completed.

[0068] Step 5: Start the pressing cylinder 26 connected to the pressing support 23 in the pressing assembly 9 to drive the pressing support 23 to move rightward. The pressing support 23 pushes multiple wires to be pierced on the substrate 14 to pass through the wire through-holes between the upper positioning block 51 and the lower positioning block 50 and the wire-piercing holes on the sieve plate in sequence, and the wire piercing process of one sieve plate is completed.

[0069] Step 6: Start the lifting cylinder 67 in the top cover assembly 11 to drive the top cover 66 and the upper positioning block 51 to return to the initial position upward, so that the upper positioning block 51 connected to the top cover assembly 11 is separated from the lower positioning block 50 by a certain distance; at the same time, start the pressing cylinder 26 connected to the positioning support 27 in the pressing assembly 9 to drive the positioning support 27 to return to the initial position rightward.

[0070] Step 7: Control the lifting mechanism in the reciprocating guiding assembly 10 to drive the sieve plate supporting unit and the wire supporting unit to lift the sieve plate and the wire that have completed wire threading upward by a certain height. Then, control the bottom plate mechanism to drive the lifting mechanism, the sieve plate supporting unit, the wire supporting unit, and the sieve plate and wire that have completed wire threading to move leftward by one working position. Then, control the lifting mechanism to drive the sieve plate supporting unit, the wire supporting unit, and the sieve plate and wire that have completed wire threading to move downward, so that the sieve plate and wire that have completed wire threading fall back onto the sieve plate positioning mechanism and the wire positioning mechanism I in the base assembly. After that, control the bottom plate mechanism to drive the lifting mechanism, the sieve plate supporting unit, and the wire supporting unit to move rightward by one working position to return the entire reciprocating guiding assembly to its initial position; that is, the vertical cylinder 38 connected to the bottom plate 37 in the reciprocating guiding assembly 10 pushes the "lifting plate unit" composed of the lifting mechanism, the wire supporting unit, and the sieve plate supporting unit to lift the sieve plate with wire threaded and the wire upward by a certain height, completely separating them from the components on the base assembly 16 within a certain height range. Then, the horizontal cylinder 30 connected to the bottom plate 37 pulls the bottom plate and the "lifting plate unit" on the bottom plate to the left, stops after moving a certain working distance. At this time, the vertical cylinder 38 contracts, and the "lifting plate unit" drops to place the sieve plate and the wire back on the base assembly and return to the initial horizontal plane height position. The horizontal cylinder 30 then pushes the bottom plate and the "lifting plate unit" on the bottom plate to move rightward by a certain working distance to return the entire reciprocating guiding assembly to its initial position;

[0071] Step 8: Take another sieve plate to be wire-threaded and repeat the operations in Steps 2 to 7 above until all the sieve plates on the entire threshing concave plate have completed wire threading.

[0072] The wire threading device of the present invention is used for a new method of manufacturing a threshing concave plate. Aiming at the problem in the prior art that during the manufacturing process of the threshing concave plate of a grain harvester, when the wire is threaded into the sieve plate holes of the assembled component, due to reasons such as misaligned hole positions, the wire cannot pass through the sieve plate smoothly, automated production cannot be achieved, and a large amount of manual labor is required for wire threading of the partition plates, resulting in low production efficiency and high labor intensity. By changing the existing manufacturing process method of the threshing concave plate, the wire threading work of the sieve plate can be carried out efficiently and conveniently, thereby improving the success rate and efficiency of the wire passing through the holes on the sieve plate during the manufacturing process, reducing the difficulty of wire threading, and making it easy to realize automated production during the manufacturing process.

[0073] The specific operating process steps of the new method for manufacturing a threshing concave plate are as follows:

[0074] Step 1: Straighten the disc-shaped raw material wire through a straightening machine. After that, cut the raw material wire according to the unfolded size of each working wire in the finished threshing concave plate. Then, perform end treatment on the obtained wire materials so that both ends of each wire material are in the shape of "nail tips", enabling the wire to have good self-guidance during perforation.

[0075] Step 2: According to the number of working wires required in the finished threshing concave plate, take multiple (≥10) wire materials straightened in Step 1. After that, use a wire threading device to sequentially thread the multiple wire materials into the wire threading holes of multiple sieve plates to obtain a grid-shaped sieve plate assembly for standby.

[0076] Step 3: Weld a rear cross side plate and a front cross side plate at the upper and lower ends of the sieve plate assembly obtained in Step 2 respectively, so that the starting ends of all wires on the sieve plate assembly are welded to the front cross side plate, and the terminating ends are welded to the rear cross side plate to obtain a frame assembly.

[0077] Step 4: Perform flexible bending deformation treatment on the frame assembly obtained in Step 3 using a flexible bending die. The flexible bending die can achieve a bending of more than 180 degrees, so that the curvature radius of the wire after demoulding is controlled within 3% of the design requirement, that is, the curvature radius of the wire on the frame assembly after demoulding is ±3% of the curvature radius of the working wire in the finished threshing concave plate.

[0078] Step 5: Place the frame assembly that has completed the flexible bending deformation treatment in Step 4 on a welding jig and press it tightly so that the frame assembly fits the welding jig. After that, weld a side plate at each of the left and right ends of the frame assembly, weld a lifting ear on each side plate, weld a middle partition plate in the middle of the frame assembly, and weld a front sealing plate between the front cross side plate and the sieve plate closest to the starting end of the wire in the frame assembly. After all welding is completed and cooled, loosen the fixture and take out the obtained welded part from the welding jig.

[0079] Step 6: Clean the surface welding slag of the welded part obtained in Step 5. After passing the inspection, the finished threshing concave plate is obtained.

[0080] The above manufacturing method of the threshing concave plate solves the problem of perforating multiple-hole plates of the threshing concave plate wire during the manufacturing process of the grain harvester, avoids the interference problem between the wire and the holes on the plate, is simple and easy to implement, and is easy for automated production, with high production application value. It can reduce human errors, greatly improve the wire threading efficiency, reduce the production cycle of the product, and reduce the labor intensity of operators.

[0081] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those skilled in the art, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples described herein.

Claims

1. A wire threading device for manufacturing a threshing concave of a grain harvester, characterized in that: It includes a base component, as well as a press-in component, a reciprocating guiding component, a top cover component, and a wire hole positioning component provided on the base component. The base component includes a horizontally arranged base plate, a wire positioning mechanism I and a sieve plate fixing mechanism provided on the upper surface of the base plate, and two long columns and two short columns vertically arranged at the four corners of the base plate. The two short columns are inserted through the right side of the base plate, and the two long columns are inserted through the left side of the base plate. A cross beam fixing plate is also horizontally arranged between the tops of the two long columns; The press-in component includes two horizontal guide columns, a press-in support, and a positioning support. The two horizontal guide columns are arranged parallel to the front and rear sides of the base plate. The middle of each horizontal guide column is fixed to the lower surface of the base plate through a guiding support. The press-in support for pressing the wire to the right is sleeved on the left end of the two horizontal guide columns. The positioning support for pushing the wire hole positioning component to the left to achieve pre-positioning before wire threading of the sieve plate is sleeved on the right end of the two horizontal guide columns, so that the press-in support, the positioning support, and the two horizontal guide columns together form a rectangular frame structure. Two pressing cylinders for driving the press-in support and the positioning support to slide left and right on the horizontal guide columns are also fixed on the lower surface of the base plate; The top cover component includes a lifting cylinder, a top cover, and a wire positioning mechanism II provided on the lower surface of the top cover. The lifting cylinder is fixed on the cross beam fixing plate, and the end of its piston rod is connected to the upper part of the top cover. The wire positioning mechanism II is fixed on the lower surface of the top cover and can cooperate with the wire positioning mechanism I on the base plate to achieve the positioning and guiding of multiple wires to be threaded on the base plate; The wire hole positioning component includes a return plate, a link mechanism, and a plurality of floating positioning units. The return plate is movably connected to the lower surface of the base plate. One end of the link mechanism is rotatably connected to the base plate, and the other end is rotatably connected to the positioning support. The central rotating shaft in the middle of the link mechanism is fixed on the return plate, so that the link mechanism can drive the return plate to move up and down relative to the base plate. The plurality of floating positioning units are arranged at intervals in the front and back on the rightmost side of the base plate, and the number of floating positioning units is the same as the number of wires to be threaded on each sieve plate in the finished product threshing concave plate. Each floating positioning unit includes an upper positioning block, a lower positioning block, a positioning rod, and a lower floating mechanism. Among them, the lower floating mechanism is fixed on the return plate and penetrates through the base plate. The upper positioning block is movably connected to the top cover. The lower positioning block is placed on the lower floating mechanism. A groove for placing the sieve plate is provided on the lower positioning block. A wire through hole for the wire to penetrate is provided on the upper positioning block and the lower positioning block on the left side of the groove. The wire through hole realizes positioning through the up and down floating of the upper positioning block relative to the top cover and the up and down floating of the lower positioning block along with the lower floating mechanism. A horizontal through hole for the positioning rod to penetrate is provided on the lower positioning block on the right side of the groove. The positioning rod, under the push of the positioning support on its right side, sequentially penetrates through the wire threading holes on the sieve plate and the wire through holes between the upper positioning block and the lower positioning block, realizing the floating positioning between the wire threading holes on the sieve plate and the wires on the base plate; The described reciprocating guiding assembly includes a bottom plate mechanism horizontally arranged on the base assembly, a lifting mechanism installed on the bottom plate mechanism, and a wire support unit and a sieve plate support unit arranged at the top end of the lifting mechanism. The wire support unit for supporting the wire and the sieve plate support unit for supporting the sieve plate can both move up and down with the lifting mechanism and can move left and right with the bottom plate mechanism, thereby realizing the working position transfer of the sieve plate and the wire after the wire passes through the sieve plate.

2. A wire threading device for manufacturing a threshing concave of a grain harvester according to claim 1, characterized in that: The described wire positioning mechanism I includes a plurality of wire guiding plates and a plurality of wire positioning plates fixed on the substrate, and the sieve plate fixing mechanism includes a plurality of sieve plate fixing seats arranged at intervals left and right.

3. A wire threading device for manufacturing a threshing concave of a grain harvester according to claim 1, characterized in that: At the center of the lower surface of the substrate, a cylinder fixing seat for installing two pressing cylinders is also arranged.

4. A wire threading device for manufacturing a threshing concave of a grain harvester according to claim 1, characterized in that: The number of the link mechanisms is two sets, and the two sets of link mechanisms are respectively arranged on the front side and the rear side of the substrate. Each set of link mechanism includes two return link rods sleeved on the central rotating shaft, bearings and locking nuts, and the bearings are fixed on the return plate. The end of the link mechanism is rotationally connected to the positioning support or the side surface of the substrate through a fixed pin shaft.

5. A wire threading device for manufacturing a threshing concave of a grain harvester according to claim 1, characterized in that: A limit pin is fixed on the lower surface of the top cover, a pin hole for cooperating with the limit pin is arranged on the upper positioning block, and an internal hexagonal screw is also fixed on the upper positioning block. The top end of the internal hexagonal screw is placed inside the top cover and can move up and down. A return spring II is sleeved in the middle of the internal hexagonal screw, and the return spring II is placed in a preset counterbore on the lower surface of the top cover. The expansion and contraction of the return spring II and the up and down movement of the internal hexagonal screw realize the up and down floating of the upper positioning block relative to the top cover.

6. A wire threading device for manufacturing a threshing concave of a grain harvester according to claim 1, characterized in that: The described lower floating mechanism includes two vertically arranged floating rods. The lower ends of the floating rods are fixed on the return plate, and their upper ends extend out of the upper surface of the substrate by a certain height after passing through the preset mounting holes on the substrate. Springs are sleeved on the floating rods in the mounting holes, and fixed screw sleeves for preventing the floating rods from disengaging from the substrate are also arranged at the lower part of the mounting holes. The lower positioning block is sleeved on the top ends of the floating rods. The link mechanism drives the up and down movement of the return plate and the floating rods, realizing the up and down floating of the lower positioning block relative to the substrate.

7. A wire threading device for manufacturing a threshing concave of a grain harvester according to claim 1, characterized in that: The right end of the positioning rod abuts against the positioning support. A return spring III is sleeved on the part of the positioning rod located on the right side of the lower positioning block. A locking screw for preventing the positioning rod from disengaging from the horizontal through hole of the lower positioning block is also arranged on the lower positioning block. An anti - detachment card slot for cooperating with the locking screw is arranged on the positioning rod. A pressure rod is also arranged between the lower positioning block and the positioning support. The pressure rod is horizontally arranged. One end of the pressure rod is fixed on the lower positioning block, and the other end is inserted into a preset through hole on the positioning support after being sleeved with a return spring IV. The pressure rod extends out of the positioning support by a certain length, and an anti - detachment nut is fixed at the extended end.

8. A wire threading device for manufacturing a threshing concave of a grain harvester according to claim 1, characterized in that: The described top cover is sleeved on two long columns and two short columns and can move up and down along the two long columns and two short columns driven by a lifting cylinder. The wire positioning mechanism II includes a plurality of upper guiding plates, a positioning plate I and a positioning plate II fixed on the lower surface of the top cover.

9. A wire threading device for manufacturing a threshing concave of a grain harvester according to claim 1, characterized in that: The described bottom plate mechanism includes a horizontally arranged bottom plate, a horizontal cylinder, a long support rod seat erected between two long columns, two short support seats respectively installed on two short columns, and two parallel guide rods. The two ends of the long support rod seat are respectively connected to a short support seat through a guide rod, so that the long support rod seat and the two guide rods form three sides of a horizontally arranged rectangular frame structure. A bottom plate guide seat is sleeved on each guide rod, and the bottom plate guide seat is fixedly connected to the bottom plate. The horizontal cylinder is fixed in the middle of the long support rod seat, and the end of its piston rod is connected to the left end of the bottom plate, so that the horizontal cylinder can drive the bottom plate to slide left and right on the two guide rods; The described lifting mechanism includes a vertical cylinder, a horizontally arranged lifting plate, four vertical guide posts fixed on the bottom plate, and four guide sleeves installed on the lifting plate. The vertical cylinder is fixed on the bottom plate, and the end of its piston rod is connected to the lifting plate above the bottom plate. The four guide sleeves are vertically fixed in four guide sleeve holes provided on the lifting plate corresponding to the four vertical guide posts. The four vertical guide posts are respectively inserted into the four guide sleeves one by one, and the top ends of the vertical guide posts extend out of the lifting plate by a certain height. The vertical cylinder can drive the lifting plate and the four guide sleeves to slide up and down on the four vertical guide posts; The described wire support unit and the sieve plate support unit are both fixed on the upper surface of the lifting plate. The wire support unit includes a spring wire support block fixed at the left end of the lifting plate, and the sieve plate support unit includes a sieve plate support block and a transition block fixedly arranged at the right end of the lifting plate in sequence from top to bottom.

10. The wire threading method of a wire threading device for manufacturing a threshing concave of a grain harvester according to claim 1, characterized in that, It includes the following steps: Step 1: Place multiple wires to be threaded on the wire positioning mechanism I of the base component; Step 2: Take a sieve plate to be wire-threaded and place it in the groove of the lower positioning block in the wire hole positioning component, and make the side of the sieve plate flush with the boundary of the groove; Step 3: Start the lifting cylinder in the top cover component to drive the top cover to move downward until the upper positioning block and the lower positioning block in the wire hole positioning component are about to be in contact. At this time, the lifting cylinder stops operating. The wire positioning mechanism II in the top cover component cooperates with the wire positioning mechanism I in the base component to jointly position the multiple wires to be threaded on the substrate; Step 4: Start the pressing cylinder connected to the positioning support in the pressing-in component to drive the positioning support to move leftward. During the process, the linkage mechanism in the wire hole positioning component drives the lower floating mechanism and the lower positioning block to float up and down, so that the wire through hole between the upper positioning block and the lower positioning block is accurately aligned with the wire-passing hole on the sieve plate. The positioning support pushes the positioning rod to sequentially pass through the wire-passing hole and the wire through hole through the horizontal through hole on the lower positioning block. At this time, the pressing cylinder stops operating. Start the lifting cylinder in the top cover component again to drive the top cover and the upper positioning block to move downward until the upper positioning block and the lower positioning block are completely pressed together. Then, start the pressing cylinder connected to the positioning support again to drive the positioning support to move rightward, so that the positioning rod disengages from the wire-passing hole and the wire through hole, and the wire hole positioning before wire threading of the sieve plate is completed; Step 5: Start the pressing cylinder in the pressing component that is connected to the pressing support, and drive the pressing support to move to the right. The pressing support pushes multiple wires to be threaded on the substrate to sequentially pass through the wire through-holes between the upper positioning block and the lower positioning block and the wire threading holes on the sieve plate, completing the wire threading process for one sieve plate; Step 6: Start the lifting cylinder in the top cover component to drive the top cover and the upper positioning block to return upward to the initial position, and start the pressing cylinder in the pressing component that is connected to the positioning support to drive the positioning support to return to the right to the initial position; Step 7: Control the lifting mechanism in the reciprocating guiding component to drive the sieve plate supporting unit and the wire supporting unit to lift the sieve plate and the wire that have completed the wire threading process upward by a certain height. Then, control the bottom plate mechanism to drive the lifting mechanism, the sieve plate supporting unit, the wire supporting unit, and the sieve plate and the wire that have completed the wire threading process to move left by one working position. Then, control the lifting mechanism to drive the sieve plate supporting unit, the wire supporting unit, and the sieve plate and the wire that have completed the wire threading process to move downward, so that the sieve plate and the wire that have completed the wire threading process fall back onto the sieve plate positioning mechanism and the wire positioning mechanism I in the base component. Then, control the bottom plate mechanism to drive the lifting mechanism, the sieve plate supporting unit, and the wire supporting unit to move right by one working position to return the entire reciprocating guiding component to the initial position; Step 8: Take another sieve plate to be threaded and repeat the operations in Steps 2 to 7 above until all the sieve plates on the entire threshing concave plate have completed the wire threading.

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