Special gearbox for integrated clamping and straightening and keyway phase processing method
By integrating the pinch roller and straightening roller in one gear box, and adopting a compact gear set design and reasonable keyway phase design, the space occupation and maintenance inconvenience caused by the setting of pinch roller and straightening roller in the two gear boxes in the prior art is solved, and efficient and compact equipment design and installation are achieved.
Patent Information
- Application Number
- CN202510245382.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2025-04-01
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the prior art, the pinch roller and the straightening roller are respectively arranged in two different gear boxes, resulting in an increase in the footprint, insufficient space utilization, inconvenient maintenance, and poor economic benefits. In addition, the straightening roller and coupling coupling shaft are inconvenient to install and the accuracy is not high.
A special gear box for integrated pinch and straightening is designed, which reduces the footprint by integrating pinch and straightening rollers in one gear box and adopts a compact gear set design. At the same time, by rationally designing the keyway phase, the on-site installation process is simplified and production efficiency is improved.
The functional integration of pinch rollers and straightening rollers is achieved, which significantly reduces the footprint, optimizes space utilization, simplifies the maintenance process, improves economic benefits, and improves the joint installation accuracy of the straightening rollers and couplings.
Smart Images

Figure CN119737423A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of gear boxes, and in particular to a special gear box integrating clamping, conveying and straightening, and a keyway phase processing method. Background Art
[0002] In the steel, paper, plastic and other industries, pinch rollers and straightening rollers are important industrial conveying and processing equipment. Pinch rollers are mainly used to clamp and convey materials to ensure that the materials are stable and accurate during the transmission process; while straightening rollers are used to straighten bent or deformed materials to improve the straightness and quality of the materials. With the development of industrial production, higher requirements are placed on the efficiency, compactness and versatility of equipment.
[0003] In the prior art, the pinch roller and the straightening roller are respectively arranged in two different gear boxes. This arrangement requires the installation of two gear boxes, which increases the floor space and is not convenient for use in a factory environment with limited space. In addition, the pinch roller and the straightening roller are arranged separately, which is not convenient for later maintenance and has poor economic benefits. In addition, the installation of the straightening roller and the coupling shaft in the prior art is inconvenient and the accuracy is not high. Summary of the invention
[0004] The purpose of the present invention is to provide a special gear box integrating clamping, conveying and straightening and a keyway phase processing method, so as to solve the above-mentioned technical problems.
[0005] The technical solution adopted by the present invention is as follows: a special gear box for integrated pinching and straightening, comprising a box body, pinching rollers, straightening rollers, a first gear set and a second gear set, a number of the pinching rollers are arranged at one end of the box body, a number of the straightening rollers are arranged at the other end of the box body, a number of the pinching rollers are connected by transmission through the first gear set, a number of the straightening rollers are connected by transmission through the second gear sets, part of the pinching rollers extend out of one side of the box body, and the rest of the pinching rollers extend out of the other side of the box body, part of the straightening rollers extend out of one side of the box body, and the rest of the straightening rollers extend out of the other side of the box body; wherein, a number of the straightening rollers include an input straightening roller and five output straightening rollers, one end of the five output straightening rollers extends out of one side of the box body, and one input One end of the straightening roller extends out of the other side of the box, the axes of the five output straightening rollers are parallel, and the center points of the five output straightening rollers are connected in sequence to form an isosceles trapezoidal trajectory; and the plurality of pinch rollers include a first pinch roller, a second pinch roller and a third pinch roller, one end of the first pinch roller and the second pinch roller extend out of one side of the box, one end of the third pinch roller extends out of the other side of the box, the first pinch roller is located above the second pinch roller, and the projections of the axes of the first pinch roller, the second pinch roller and the third pinch roller on the horizontal plane are located on the same straight line, wherein the three output straightening rollers are at the same height as the second pinch roller, and the other two output straightening rollers are located at a height between the first pinch roller and the second pinch roller.
[0006] Preferably, the first gear set includes a first intermediate gear, a second intermediate gear, a first output gear, a second output gear and a first gear shaft, wherein the first output gear is located directly above the second output gear, the first intermediate gear is located below one side of the second intermediate gear, the first gear shaft is located directly below the second intermediate gear, the third pinch roller is meshed with the first intermediate gear, the first intermediate gear is meshed with the second intermediate gear through the first gear shaft, the second intermediate gear is connected to the first output gear through the first pinch roller, the first output gear is meshed with the second output gear, and the second output gear is connected to the second pinch roller.
[0007] As a further preference, the first intermediate gear cooperates with the first gear shaft key, the second intermediate gear cooperates with the first pinch roller key, the first pinch roller cooperates with the first output gear key, and the second output gear cooperates with the second pinch roller key.
[0008] Preferably, the second gear set includes a first gear, a third gear shaft, a second gear and several third gears, and there are five third gears. The midline points of the five third gears are connected in sequence to form an isosceles trapezoidal trajectory, wherein two of the third gears are located above the other three third gears, and the first gear is arranged opposite to the third gear located on the left side below, and the second gear is at the same height as the first gear, the input straightening roller is connected to the first gear, and the first gear is connected to the second gear through the third gear shaft, and several third gears are meshed with each other, and each of the third gears is respectively provided with an output straightening roller.
[0009] As a further preference, the input straightening roller is keyed to the first gear, the first gear is keyed to the third gear shaft, the third gear shaft is meshed with the second gear, the second gear is keyed to one of the output straightening rollers, and the third gear is keyed to the output straightening roller.
[0010] As a further preference, a base plate is provided on one side of the box body, an inner hole is provided on the base plate, two first key grooves are provided on the upper and lower sides of the inner hole, one end of the output straightening roller extends out of the inner hole, two second key grooves are provided on the opposite sides of one end of the output straightening roller, a third key groove is provided on the output straightening roller at a position opposite to the third gear, and fourth key grooves are provided on the opposite sides of the shaft hole of the third gear.
[0011] A keyway phase processing method includes the above-mentioned special gearbox for integrated clamping and straightening, and the processing method includes: S1, locating the center position of each output straightening roller on a substrate, processing an inner hole as the center position according to the outer diameter size of the output straightening roller, and ensuring that a plurality of inner holes are arranged according to the distribution trajectory of a plurality of output straightening rollers; S2, then processing a first keyway on opposite sides of the inner hole, and ensuring that the two first keyways are distributed up and down; S3, opening two second keyways on opposite sides of one end of the output straightening roller, so that the second keyway is directly opposite to the first keyway, and then processing a third keyway at a position directly opposite to the third gear on the output straightening roller, so that the third keyway and one of the second keyways are on the same straight line; S4, arranging a plurality of third gears according to the distribution trajectory of the output straightening rollers and meshing with each other and placing them on a workbench, ensuring that the center of the inner hole completely coincides with the center of the third gear, and then marking the position of the fourth keyway on the third gear according to the edge line of the first keyway and processing the fourth keyway.
[0012] The above technical solution has the following advantages or beneficial effects: (1) In the present invention, through ingenious structural design, the functions of the two combined gearboxes corresponding to the pinch roller and the straightening roller are integrated into one gearbox, thereby significantly reducing the floor space. This is particularly important in a factory environment with limited space, and can help customers make better use of space and optimize production layout.
[0013] (2) In the present invention, the internal layout of the gearbox is compact, and the various components are closely matched. Through reasonable design, the overall structure of the gearbox is easy to install and maintain.
[0014] (3) In the present invention, the output number of straightening rollers can be increased or decreased to adapt to different application scenarios and requirements, and the present invention has good versatility.
[0015] (4) In the present invention, the reasonable design of the phase relationship of the keyways of the output straightening roller saves on-site installation time and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a front structural schematic diagram of the special gearbox for integrated clamping, conveying and straightening in the present invention; Figure 2 It is a side structural schematic diagram of the special gearbox for integrated clamping, conveying and straightening in the present invention; Figure 3 It is a top view of the special gear box for integrated clamping, conveying and straightening in the present invention; Figure 4 It is a schematic diagram of the cooperation between the pinch roller and the first gear set in the present invention; Figure 5 It is a schematic diagram of the cooperation between the straightening roller and the second gear set in the present invention; Figure 6 It is a schematic diagram of the cooperation between the output straightening roller and the base plate in the present invention; Figure 7 This is a distribution diagram of the third gear.
[0017] In the figure: 1. box body; 2. lower box body; 3. middle box body; 4. upper box body; 5. box cover; 6. first pinch roller; 7. second pinch roller; 8. third pinch roller; 9. first intermediate gear; 10. second intermediate gear; 11. first output gear; 12. second output gear; 13. first gear shaft; 15. input straightening roller; 16. output straightening roller; 17. first gear; 18. third gear shaft; 19. second gear; 20. third gear; 21. base plate; 22. inner hole; 23. first keyway; 24. second keyway; 25. third keyway; 26. fourth keyway. DETAILED DESCRIPTION
[0018] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0019] In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0021] See also Figures 1 to 7 As shown, a preferred embodiment is shown, in which a special gear box for integrated pinching and straightening is shown, comprising a box body 1, pinching rollers, straightening rollers, a first gear set and a second gear set. A number of pinching rollers are arranged at one end of the box body 1, and a number of straightening rollers are arranged at the other end of the box body 1. A number of pinching rollers are connected by transmission via a first gear set, and a number of straightening rollers are connected by transmission via a number of second gear sets. Some pinching rollers extend out of one side of the box body 1, and the remaining pinching rollers extend out of the other side of the box body 1. Some straightening rollers extend out of one side of the box body 1, and the remaining straightening rollers extend out of the other side of the box body 1. In this embodiment, the box body 1 comprises a lower box body 2, a middle box body 3, an upper box body 4 and a box cover 5, which are arranged in sequence from bottom to top, and the pinching rollers, the straightening rollers and the first gear set and the second gear set are arranged in the box body 1 composed of the lower box body 2, the middle box body 3, the upper box body 4 and the box cover 5. The positions of the pinching rollers and the straightening rollers can be seen in FIG. Figure 1 As shown, the pinch rollers are concentrated together, and the straightening rollers are concentrated together. In this embodiment, the pinch rollers and the straightening rollers are concentrated in one gear box, which has the functions of two gear boxes, effectively saves floor space, and brings significant convenience and economic benefits to users.
[0022] Among them, the plurality of straightening rollers include an input straightening roller 15 and five output straightening rollers 16, one end of the five output straightening rollers 16 extends out of one side of the box body 1, and one end of an input straightening roller 15 extends out of the other side of the box body 1, the axes of the five output straightening rollers 16 are parallel, and the center points of the five output straightening rollers 16 are connected in sequence to form an isosceles trapezoidal trajectory; in this embodiment, the five output straightening rollers 16 are distributed in an isosceles trapezoidal shape, so that the phase relationship of the second keyway 24 on the output straightening roller 16 can conform to the isosceles trapezoidal distribution, which can ensure the convenience and accuracy of the on-site coupling shaft installation.
[0023] The plurality of pinch rollers include a first pinch roller 6, a second pinch roller 7 and a third pinch roller 8, one end of the first pinch roller 6 and the second pinch roller 7 extend out of one side of the box body 1, and one end of the third pinch roller 8 extends out of the other side of the box body 1, the first pinch roller 6 is located above the second pinch roller 7, and the projections of the axes of the first pinch roller 6, the second pinch roller 7 and the third pinch roller 8 on the horizontal plane are located on the same straight line, so that the sixth keyway on the first pinch roller 6 and the second pinch roller 7 can be ensured to meet Figure 1 The phase requirements shown are convenient for improving the convenience and accuracy of the coupling shaft installation. Three of the output straightening rollers 16 are at the same height as the second pinch roller 7, and the other two output straightening rollers 16 are at a height between the first pinch roller 6 and the second pinch roller 7.
[0024] Among them, see Figure 1-3 As shown, the first pinch roller 6 and the second pinch roller 7 are output shafts, and the third pinch roller 8 is the input gear shaft. When in use, by driving the third pinch roller 8 to rotate, the third pinch roller 8 provides power to drive the first gear set to rotate, and then drives the first pinch roller 6 and the second pinch roller 7 to rotate and output power. The first pinch roller 6 and the second pinch roller 7 can be connected to external equipment that needs to be powered.
[0025] Further, as a preferred embodiment, the first gear set includes a first intermediate gear 9, a second intermediate gear 10, a first output gear 11, a second output gear 12 and a first gear shaft 13, wherein the first output gear 11 is located directly above the second output gear 12, the first intermediate gear 9 is located below one side of the second intermediate gear 10, and the first gear shaft 13 is located directly below the second intermediate gear 10, so that the structure of the first gear set is more compact, and the internal space of the box 1 is reduced, thereby reducing the volume of the box, the third pinch roller 8 is meshed with the first intermediate gear 9, the first intermediate gear 9 is meshed with the second intermediate gear 10 through the first gear shaft 13, the second intermediate gear 10 is connected to the first output gear 11 through the first pinch roller 6, the first output gear 11 is meshed with the second output gear 12, and the second output gear 12 is connected to the second pinch roller 7. Among them, the first intermediate gear 9 is key-matched with the first gear shaft 13, the second intermediate gear 10 is key-matched with the first pinch roller 6, the first pinch roller 6 is key-matched with the first output gear 11, and the second output gear 12 is key-matched with the second pinch roller 7. When in use, the third pinch roller 8 drives the first intermediate gear 9 to rotate, the first intermediate gear 9 drives the first gear shaft 13 to rotate, the first gear shaft 13 drives the second intermediate gear 10 to rotate, and the second intermediate gear 10 drives the first pinch roller 6 to rotate and output power. At the same time, the first pinch roller 6 drives the first output gear 11 to rotate, and the first output gear 11 drives the second output gear 12 to rotate, and then the second output gear 12 drives the second pinch roller 7 to rotate and output power. The power output of the first pinch roller 6 and the second pinch roller 7 is achieved by two-stage reduction and one-stage differential transmission.
[0026] Further, as a preferred embodiment, the second gear set includes a first gear 17, a third gear shaft 18, a second gear 19 and a plurality of third gears 20, five third gears 20 are provided, and the midline points of the five third gears 20 are connected in sequence to form an isosceles trapezoidal trajectory, wherein two third gears 20 are located above the other three third gears 20, and the first gear 17 is arranged opposite to the third gear 20 located on the left side below, and the second gear 19 is at the same height as the first gear 17. Such an arrangement can make the second gear set structure more compact, facilitate reducing the internal space occupied by the box body 1, and thus reduce the volume of the box body 1, the input straightening roller 15 is connected to the first gear 17, the first gear 17 is connected to the second gear 19 through the third gear shaft 18, and the plurality of third gears 20 are meshed with each other, and each third gear 20 is respectively provided with an output straightening roller 16. The input straightening roller 15 is keyed with the first gear 17, the first gear 17 is keyed with the third gear shaft 18, the third gear shaft 18 is meshed with the second gear 19, the second gear 19 is keyed with one of the output straightening rollers 16, and the third gear 20 is keyed with the output straightening roller 16. When in use, the rotation of the input straightening roller 15 first drives the first gear 17 to rotate, then the first gear 17 drives the third gear shaft 18 to rotate, the third gear shaft 18 drives the second gear 19 to rotate, and the second gear 19 drives one of the output straightening rollers 16 to rotate. Since the third gears 20 are meshed with each other, see Figure 7 As shown, the output straightening roller 16 drives one of the third gears 20 to rotate, and the third gear 20 drives the remaining third gears 20 to rotate, thereby driving the remaining output straightening rollers 16 to rotate, thereby realizing multiple power outputs.
[0027] Further, as a preferred embodiment, a base plate 21 is provided on one side of the box body 1, an inner hole 22 is provided on the base plate 21, two first key grooves 23 are provided on the upper and lower sides of the inner hole 22, one end of the output straightening roller 16 extends out of the inner hole 22, two second key grooves 24 are provided on the opposite sides of one end of the output straightening roller 16, a third key groove 25 is provided on the position of the output straightening roller 16 facing the third gear 20, and fourth key grooves 26 are provided on the opposite sides of the shaft hole of the third gear 20. The base plate 21 is connected to one side of the box body 1 by bolts. Figure 6 It is a partial schematic diagram of the base plate 21. A mounting hole for mounting the first pinch roller 6 and the second pinch roller 7 is provided on the base plate 21. A fifth key slot is provided on the upper side of the mounting hole. A sixth key slot is provided on the first pinch roller 6 and the second pinch roller 7. A seventh key slot is provided on the upper side of the shaft hole of the first output gear 11 and the second output gear 12. The sixth key slot is on the same straight line and in the same phase as the seventh key slot. A line can be drawn on the first output gear 11 and the second output gear 12 according to the outline of the fifth key slot to mark the position of the seventh key slot, which is convenient for processing the seventh key slot.
[0028] The following is an embodiment of the keyway phase processing method in the present invention.
[0029] A keyway phase processing method, comprising a special gearbox for integrated clamping and straightening, characterized in that the processing method comprises: S1. Locate the center position of each output straightening roller 16 on the substrate 21, and process the inner hole 22 at the center position according to the outer diameter size of the output straightening roller 16 to ensure that the plurality of inner holes 22 are arranged according to the distribution trajectory of the plurality of output straightening rollers 16.
[0030] S2. Then, the first key grooves 23 are processed on the opposite sides of the inner hole 22 to ensure that the two first key grooves 23 are distributed up and down.
[0031] S3. Two second key grooves 24 are provided on opposite sides of one end of the output straightening roller 16, so that the second key grooves 24 are opposite to the first key grooves 23, and then a third key groove 25 is processed at a position opposite to the third gear 20 on the output straightening roller 16, so that the third key groove 25 is on the same straight line as one of the second key grooves 24.
[0032] S4. Arrange several third gears 20 according to the distribution trajectory of the output straightening roller 16 and place them on the workbench after meshing with each other, ensuring that the center of the inner hole 22 completely coincides with the center of the third gear 20, and then mark the position of the fourth keyway 26 on the third gear 20 according to the edge line of the first keyway 23 and process the fourth keyway 26.
[0033] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.
Claims
1. A special gearbox for integrated clamping, conveying and straightening, characterized by: It comprises a box body, a pinch roller, a straightening roller, a first gear set and a second gear set, a number of the pinch rollers are arranged at one end of the box body, a number of the straightening rollers are arranged at the other end of the box body, a number of the pinch rollers are connected to each other through the first gear set, a number of the straightening rollers are connected to each other through the second gear set, a part of the pinch rollers extend out of one side of the box body, and the remaining pinch rollers extend out of the other side of the box body, a part of the straightening rollers extend out of one side of the box body, and the remaining straightening rollers extend out of the other side of the box body; wherein, a number of the straightening rollers comprise an input straightening roller and five output straightening rollers, one end of the five output straightening rollers extend out of one side of the box body, one end of one input straightening roller extends out of the other side of the box body On one side, the axes of the five output straightening rollers are parallel, and the center points of the five output straightening rollers are connected in sequence to form an isosceles trapezoidal trajectory; and the plurality of pinch rollers include a first pinch roller, a second pinch roller and a third pinch roller, one end of the first pinch roller and the second pinch roller extend out of one side of the box, one end of the third pinch roller extends out of the other side of the box, the first pinch roller is located above the second pinch roller, and the projections of the axes of the first pinch roller, the second pinch roller and the third pinch roller on the horizontal plane are located on the same straight line, wherein three of the output straightening rollers are at the same height as the second pinch roller, and the other two output straightening rollers are located at a height between the first pinch roller and the second pinch roller.
2. The special gearbox for integrated pinching and straightening according to claim 1, characterized in that: The first gear set includes a first intermediate gear, a second intermediate gear, a first output gear, a second output gear and a first gear shaft, wherein the first output gear is located directly above the second output gear, the first intermediate gear is located below one side of the second intermediate gear, the first gear shaft is located directly below the second intermediate gear, the third pinch roller is meshed with the first intermediate gear, the first intermediate gear is meshed with the second intermediate gear through the first gear shaft, the second intermediate gear is connected to the first output gear through the first pinch roller, the first output gear is meshed with the second output gear, and the second output gear is connected to the second pinch roller.
3. The special gearbox for integrated pinching and straightening as claimed in claim 2, characterized in that: The first intermediate gear is keyed to the first gear shaft, the second intermediate gear is keyed to the first pinch roller, the first pinch roller is keyed to the first output gear, and the second output gear is keyed to the second pinch roller.
4. The special gearbox for integrated pinching and straightening according to claim 1, characterized in that: The second gear set includes a first gear, a third gear shaft, a second gear and a plurality of third gears. There are five third gears, and the midline points of the five third gears are connected in sequence to form an isosceles trapezoidal trajectory, wherein two of the third gears are located above the other three third gears, and the first gear is arranged opposite to the third gear located on the left side below, and the second gear is at the same height as the first gear, the input straightening roller is connected to the first gear, and the first gear is connected to the second gear through the third gear shaft, and the plurality of third gears are meshed with each other, and each of the third gears is respectively provided with an output straightening roller.
5. The special gearbox for integrated pinching and straightening as claimed in claim 4, characterized in that: The input straightening roller is keyed to the first gear, the first gear is keyed to the third gear shaft, the third gear shaft is meshed with the second gear, the second gear is keyed to one of the output straightening rollers, and the third gear is keyed to the output straightening roller.
6. The special gearbox for integrated pinching, conveying and straightening as claimed in claim 5, characterized in that: A base plate is provided on one side of the box body, an inner hole is formed on the base plate, two first key grooves are formed on the upper and lower sides of the inner hole, one end of the output straightening roller extends out of the inner hole, two second key grooves are formed on the opposite sides of one end of the output straightening roller, a third key groove is formed on the output straightening roller at a position facing the third gear, and fourth key grooves are formed on the opposite sides of the shaft hole of the third gear.
7. A keyway phase processing method, comprising the special gearbox for integrated clamping and straightening as claimed in claim 6, characterized in that: The processing method comprises: S1, locating the center position of each output straightening roller on the substrate, processing the inner hole as the center position according to the outer diameter size of the output straightening roller, and ensuring that the plurality of inner holes are arranged according to the distribution trajectory of the plurality of output straightening rollers; S2, then processing the first keyway on the opposite sides of the inner hole, and ensuring that the two first keyways are distributed up and down; S3, opening two second keyways on the opposite sides of one end of the output straightening roller, so that the second keyway is directly opposite to the first keyway, and then processing the third keyway at the position directly opposite to the third gear on the output straightening roller, so that the third keyway is on the same straight line with one of the second keyways; S4, arranging the plurality of third gears according to the distribution trajectory of the output straightening rollers and meshing with each other and placing them on the workbench, ensuring that the center of the inner hole completely coincides with the center of the third gear, and then marking the position of the fourth keyway on the third gear according to the edge line of the first keyway and processing the fourth keyway.
Citation Information
Patent Citations
Multifunctional clamping finisher
CN101507988A
Key slot processing method for enabling two same gears to have synchronous meshing phases
CN102528565A
Five-roller straightener capable of extruding roller-shaped curved surface
CN105772539A
High-rib wallboard local straightening device and straightening method
CN118357309A
Main transmission combination gear case device
CN202901175U