A device for polishing a cross shaft

Abstract

The present invention relates to the technical field of cross-axis grinding, and discloses a device for cross-axis grinding, which includes a workbench. A chuck, a clamping member and a grinding member are arranged on the workbench. The chuck is used to clamp the journal on one side of the cross-axis and drive the cross-axis to rotate. An external turning tool for grinding the journal on the other side is arranged on the grinding member. The clamping member is used to clamp and fix the remaining two journals. The clamping member includes an outer ring and an inner ring rotatably connected to the inner side of the outer ring. Two fixed clamps and a positioning clamp are arranged on the inner side of the inner ring; both the fixed clamp and the positioning clamp include a clamp seat connected to the inner side of the inner ring and two half-ring clamps symmetrically sliding on the clamp seat. The clamp seat on the fixed clamp is connected to the inner side of the inner ring in a lifting manner, and the clamp seat on the positioning clamp is fixedly connected to the inner side of the inner ring. Limiting convex blocks are also arranged on the inner sides of the half-ring clamps on the two fixed clamps, which has the advantages of automatically adapting to cross-axes of different sizes, high grinding accuracy, good cooling effect and good cleaning effect.

Description

Technical Field

[0001] The present invention relates to the technical field of cross shaft grinding, and specifically to a device for cross shaft grinding. Background Art

[0002] In the field of mechanical manufacturing, the cross shaft, as a key transmission component, is widely used in universal couplings in many industries such as automobiles, construction machinery, and aerospace. Its quality and precision have a crucial impact on the performance, stability, and service life of the entire transmission system. With the rapid development of modern industry, the demand for cross shafts is increasing day by day, and at the same time, the requirements for its processing precision and surface quality are also getting higher and higher.

[0003] The processing technology of cross shafts usually includes multiple processes such as forging, turning, and milling, and the grinding process is an indispensable link. At present, during the grinding process of cross shafts, most enterprises still adopt traditional manual grinding or semi-automatic grinding methods.

[0004] Manual grinding depends on the experience and skills of workers. The quality of cross shafts ground by different workers varies greatly, and it is difficult to ensure high and stable precision. When grinding key parts such as the journal and shoulder of the cross shaft, it is very easy to have a situation where the dimensional deviation is too large, affecting the fitting precision between the cross shaft and other components. The patent with the publication number CN113352159A discloses a surface grinding device for cross shaft processing. This patent grinds by moving the grinding sleeve back and forth, with low grinding precision and poor efficiency. At the same time, it cannot automatically adjust the height according to cross shafts of different sizes, the waste generated during grinding cannot be cleaned in time, and the heat generated during grinding will also affect the grinding precision. Summary of the Invention

[0005] (I) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the present invention provides a device for cross shaft grinding, which has the advantages of automatically adapting to cross shafts of different sizes, high grinding precision, good cooling effect, and good cleaning effect, and solves the problems in the above background art.

[0007] (II) Technical Solutions

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A device for grinding a cross shaft, comprising a workbench, wherein a chuck, a clamping member and a grinding member slidably connected to the workbench are arranged on the workbench. The chuck is used for clamping the journal on one side of the cross shaft and driving the cross shaft to rotate. An external turning tool for grinding the journal on the other side is arranged on the grinding member. The clamping member is used for clamping and fixing the remaining two journals. The clamping member comprises an outer ring slidably connected to the workbench and an inner ring rotatably connected to the inner side of the outer ring. Two fixed clamps and a positioning clamp are arranged on the inner side of the inner ring. The line connecting the two fixed clamps is the first axis, the first axis passes through the rotation center of the inner ring, and the line connecting the rotation center of the inner ring and the positioning clamp is the second axis. The first axis is perpendicular to the second axis;

[0010] Both the fixed clamp and the positioning clamp include a clamp seat connected to the inner side of the inner ring and two semi-ring clamps symmetrically sliding on the clamp seat. The clamp seat on the fixed clamp is connected to the inner side of the inner ring in a lifting manner. The clamp seat on the positioning clamp is fixedly connected to the inner side of the inner ring. Limiting protrusions are further arranged on the inner sides of the semi-ring clamps of the two fixed clamps;

[0011] During positioning, the first journal on the cross shaft is slidably connected to the positioning clamp, and the other two journals perpendicular to the first journal on the cross shaft are rotatably connected to the fixed clamp. By making the two rotation axes on the cross shaft coincide with the first axis and the second axis respectively, the center point of the cross shaft is positioned at the rotation center of the inner ring. During grinding, the positioning clamp is loosened to make the cross shaft rotate 90 degrees around the first axis. The clamping member slides on the workbench to align the rotated outer journal with the clamping hole on the chuck and insert it for fixation. The chuck is started to drive the cross shaft to rotate. At this time, the inner ring is fixed on the outer side of the cross shaft and rotates with the cross shaft. The fixed clamp always fixes the two journals located on the first axis. The grinding member is slid to the side of the journal facing away from the chuck to grind it.

[0012] Preferably, a part of the inner side of the outer ring contacts and is rotatably connected to a part of the outer side of the inner ring. A nozzle pipe is arranged on the part of the outer side of the inner ring outside the outer ring. A nozzle is arranged at the tail of the nozzle pipe. The end of the nozzle bends inward and faces the surface of the journal on the side away from the chuck. The nozzle pipe sprays air flow or coolant around the journal as the inner ring rotates.

[0013] Preferably, the nozzle is connected to the main body part through a hose. A ejector rod is fixedly connected to the clamp seat on the fixed clamp. The ejector rod passes through the inner ring, and the outer end of the ejector rod is rotatably connected to the nozzle. The height of the fixed clamp is adjusted according to the length of the cross shaft. When the fixed clamp rises and falls, it drives the ejector rod to rise and fall. The rise and fall of the ejector rod can adjust the angle of the nozzle, so that the nozzle can adjust the spraying angle according to the length of the cross shaft, so that the nozzle can accurately spray on the journals of different sizes to complete cleaning.

[0014] Preferably, an outer ring air duct is provided inside the outer ring, a connecting pipe is further provided on the outer side of the outer ring, the connecting pipe communicates with the outer ring air duct, an inner ring cavity is provided inside the inner ring, the inner ring cavity communicates with the outer ring air duct at the connection of the outer ring and the inner ring, and the nozzle is communicated with the inner ring cavity.

[0015] Preferably, the connecting pipe is connected to a high-pressure air pump through a hose, or the connecting pipe is connected to a coolant pool provided with a water pump through a hose.

[0016] Preferably, a clamping part sliding groove is provided on the workbench, an outer ring seat is fixed below the outer ring, the outer ring seat slides in the clamping part sliding groove, a lead screw and a guide post are provided in the clamping part sliding groove, threaded holes and through holes are provided on the outer ring seat corresponding to the positions of the lead screw and the guide post, and the lead screw is driven to rotate by a motor, so as to drive the outer ring seat to slide in the clamping part sliding groove.

[0017] Preferably, a rotating screw is provided in the clamping seat, threads meshing with the rotating screw are provided at the bottom of the half-ring clamp, and when the rotating screw rotates, the two half-ring clamps slide relatively or away from each other.

[0018] Preferably, a rotating screw is provided in the clamping seat, and the thread rotation directions at the front and rear ends of the rotating screw are opposite; or, two rotating screws are provided in the clamping seat, the thread rotation directions on the two rotating screws are the same, and gears meshing with each other are provided at the ends of the two rotating screws, so that when one rotating screw rotates, the other rotating screw rotates in the opposite direction.

[0019] Preferably, in any fixed clamp, a rotating nut is rotatably connected to the clamping seat, a fixed screw is fixed at the position corresponding to the rotating nut on the inner side of the inner ring, the height of the fixed clamp is adjusted by rotating the rotating nut, and at the same time, the ejector rod functions as a guide post to prevent the whole fixed clamp from rotating.

[0020] Preferably, the grinding part is slidably connected in a grinding part sliding groove on the workbench, the sliding direction of the grinding part sliding groove is parallel to the sliding direction of the clamping part, the external turning tool on the grinding part is detachably fixed on the tool rest through a bolt, the tool rest is slidably connected to the grinding part, the sliding of the tool rest is perpendicular to the sliding direction of the grinding part, a lead screw is provided in the grinding part sliding groove, lead screws and guide rails are provided between the grinding part and the tool rest, and the two ends of the two lead screws are respectively driven to rotate by two motors.

[0021] (III) Beneficial effects

[0022] Compared with the prior art, the present invention provides a device for grinding a cross shaft, having the following beneficial effects:

[0023] 1. The equipment for cross - shaft grinding has an outer ring slidably connected to the workbench, and an inner ring rotatably connected inside the outer ring. By arranging two fixed clamps and a positioning clamp on the inner side of the inner ring, where the positioning clamp is fixed inside the inner ring and the fixed clamps are vertically connected to move up and down inside the inner ring. First, fix the first journal on the cross - shaft with the positioning clamp. At this time, the journal slides back and forth between the two half - ring clamps in the positioning clamp, and slide the cross - shaft to align with the position of the fixed clamp. Adjust the height of the fixed clamp to clamp the upper and lower two journals. At this time, the journal is rotatably connected between the two half - ring clamps in the fixed clamp. The center point of the cross - shaft after clamping aligns with the rotation center of the inner ring. Then loosen the positioning clamp to rotate the cross - shaft, clamp the journal on one side of the cross - shaft in the chuck, drive the cross - shaft to rotate through the chuck, and grind the journal on the other side with the external turning tool on the grinding part, achieving the purpose of adapting to cross - shafts of different sizes, and the rotation of the chuck makes the grinding accuracy of the journal on the external turning tool higher.

[0024] 2. The equipment for cross - shaft grinding is provided with a spray pipe on the outer side of the inner ring. During the rotation of the inner ring, the spray pipe also rotates, so that the coolant or air flow ejected from the spray pipe can rotate around the journal and spray, improving the cooling and cleaning effects.

[0025] 3. The equipment for cross - shaft grinding is fixed with a push rod on the fixed clamp. The push rod rises and falls with the lifting of the clamp seat, and then the outer end of the push rod is rotatably connected to the nozzle of the spray pipe. When the length of the journal on the cross - shaft from the center of the circle is long, during clamping, it is necessary to slide the fixed clamp outward to adapt to the length of the journal. The outward sliding of the fixed clamp drives the push rod to slide outward, and the outward sliding of the push rod rotates the spraying angle of the nozzle outward, thus automatically adapting to journals of different lengths and making the air flow and coolant in the nozzle accurately sprayed onto the journal. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the present invention during grinding.

[0027] Figure 2 It is a schematic structural diagram of the present invention when separated.

[0028] Figure 3 It is a schematic structural diagram of the clamping part of the present invention in the positioning state (three journals are respectively fixed by two fixed clamps and a positioning clamp).

[0029] Figure 4 It is a front view of the clamping part of the present invention in the positioning state.

[0030] Figure 5 It is a schematic structural diagram of the clamping part of the present invention in the grinding state (two symmetrical journals are fixed by two fixed clamps, and the other two journals rotate to the outside of the clamping part).

[0031] Figure 6 This is a sectional view of the clamping part of the present invention in the grinding state.

[0032] Figure 7 For the present invention Figure 6 A partial enlarged view of area A in it.

[0033] Figure 8 This is a schematic structural diagram of the cross shaft of the present invention.

[0034] Figure 9 This is a schematic structural diagram of the inner ring of the present invention.

[0035] Figure 10 This is a schematic structural diagram of the outer ring of the present invention.

[0036] Figure 11 This is a schematic structural diagram of the positioning clamp of the present invention fixed on the inner side of the inner ring.

[0037] Figure 12 This is a schematic structural diagram of the lifting connection of the fixed clamp on the inner side of the inner ring of the present invention.

[0038] Figure 13 This is a schematic structural diagram of the connection relationship between the half-ring clamp and the internal rotating screw of the clamp seat of the present invention.

[0039] In the figure: 1, workbench; 2, chuck; 3, clamping part; 4, grinding part; 5, cross shaft; 11, sliding groove of clamping part; 12, sliding groove of grinding part; 31, outer ring; 311, air duct of outer ring; 312, connecting pipe; 313, outer ring seat; 32, inner ring; 321, fixed clamp; 322, positioning clamp; 323, inner ring cavity; 324, spray pipe; 3241, nozzle; 3242, hose; 301, clamp seat; 302, half-ring clamp; 303, limit convex block; 304, rotating nut; 305, fixed screw; 306, ejector rod; 307, rotating screw; 51, journal; 91, first axis; 92, second axis. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0042] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0043] Embodiment 1:

[0044] This embodiment provides a device for grinding a cross shaft, having the following technical features.

[0045] Please refer to Figures 1-13 , a device for grinding a cross shaft, including a workbench 1. A chuck 2 is provided on the workbench 1, and a clamping member 3 and a grinding member 4 are slidably connected to the workbench 1. The chuck 2 is used to clamp the journal 51 on one side of the cross shaft 5 and drive the cross shaft 5 to rotate. An external turning tool for grinding the journal 51 on the other side is provided on the grinding member 4. The clamping member 3 is used to clamp and fix the remaining two journals 51. The clamping member 3 includes an outer ring 31 slidably connected to the workbench 1 and an inner ring 32 rotatably connected to the inner side of the outer ring 31. Two fixed clamps 321 and a positioning clamp 322 are provided on the inner side of the inner ring 32. The connection line between the two fixed clamps 321 is the first axis 91, and the first axis 91 passes through the rotation center of the inner ring 32. The connection line between the rotation center of the inner ring 32 and the positioning clamp 322 is the second axis 92, and the first axis 91 is perpendicular to the second axis 92;

[0046] Both the fixed clamp 321 and the positioning clamp 322 include a clamp seat 301 connected to the inner side of the inner ring 32 and two half-ring clamps 302 symmetrically slidable on the clamp seat 301. The clamp seat 301 on the fixed clamp 321 is connected to the inner side of the inner ring 32 in a lifting manner, and the clamp seat 301 on the positioning clamp 322 is fixedly connected to the inner side of the inner ring 32. Limiting bumps 303 are further provided on the inner sides of the half-ring clamps 302 on the two fixed clamps 321.

[0047] In an alternative embodiment, a part of the inner side of the outer ring 31 contacts a part of the outer side of the inner ring 32 and is rotatably connected to each other. A nozzle pipe 324 is provided on the part of the outer side of the inner ring 32 outside the outer ring 31. A nozzle 3241 is provided at the tail of the nozzle pipe 324. The end of the nozzle 3241 bends inwardly towards the surface of the journal 51 on the side away from the chuck 2. The nozzle pipe 324 sprays air flow or coolant around the journal 51 as the inner ring 32 rotates.

[0048] In an alternative embodiment, the nozzle 3241 is connected to the main body part through a hose 3242. A push rod 306 is fixedly connected to a clamp seat 301 on the fixing clamp 321. The push rod 306 passes through the inner ring 32. The outer end of the push rod 306 is rotatably connected to the nozzle 3241. The height of the fixing clamp 321 is adjusted according to the length of the cross shaft 5. When the fixing clamp 321 moves up and down, it drives the push rod 306 to move up and down. The up and down movement of the push rod 306 can adjust the angle of the nozzle 3241, so that the nozzle 3241 adjusts the spraying angle according to the length of the cross shaft 5, enabling the nozzle 3241 to accurately spray on the journals 51 of different sizes to complete cleaning.

[0049] In an alternative embodiment, an outer ring air passage 311 is provided inside the outer ring 31. A connecting pipe 312 is also provided on the outer side of the outer ring 31. The connecting pipe 312 communicates with the outer ring air passage 311. An inner ring cavity 323 is provided inside the inner ring 32. The inner ring cavity 323 communicates with the outer ring air passage 311 at the connection between the outer ring 31 and the inner ring 32. The nozzle pipe 324 communicates with the inner ring cavity 323.

[0050] In an alternative embodiment, the connecting pipe 312 is connected to a high-pressure air pump through a hose, or the connecting pipe 312 is connected to a coolant pool provided with a water pump through a hose.

[0051] In an alternative embodiment, a clamping part sliding groove 11 is provided on the workbench 1. An outer ring seat 313 is fixed below the outer ring 31. The outer ring seat 313 slides in the clamping part sliding groove 11. A lead screw and guide posts are provided in the clamping part sliding groove 11. Threaded holes and through holes are provided on the outer ring seat 313 corresponding to the positions of the lead screw and guide posts. The lead screw is driven to rotate by a motor, thereby driving the outer ring seat 313 to slide in the clamping part sliding groove 11.

[0052] In an alternative embodiment, a rotating screw 307 is provided inside the clamp seat 301. Threads meshing with the rotating screw 307 are provided at the bottom of the semi-circular clamp 302. When the rotating screw 307 rotates, the two semi-circular clamps 302 slide relative to or away from each other.

[0053] In an alternative embodiment, a rotating screw 307 is provided inside the clamping seat 301, and the thread rotation directions at the front and rear ends of the rotating screw 307 are opposite; alternatively, two rotating screws 307 are provided inside the clamping seat 301, the thread rotation directions on the two rotating screws 307 are the same, and gears that mesh with each other are provided at the ends of the two rotating screws 307, so that when one rotating screw 307 rotates, the other rotating screw 307 rotates in the opposite direction.

[0054] In an alternative embodiment, inside any fixed clamp 321, a rotating nut 304 is rotatably connected to the clamping seat 301, a fixed screw 305 is fixed at the position corresponding to the rotating nut 304 on the inner ring 32, the height of the fixed clamp 321 is adjusted by rotating the rotating nut 304, and at the same time, the ejector rod 306 functions as a guide post to prevent the overall rotation of the fixed clamp 321.

[0055] In an alternative embodiment, the grinding member 4 is slidably connected in the grinding member sliding groove 12 on the workbench 1, the sliding direction of the grinding member sliding groove 12 is parallel to the sliding direction of the clamping member 3, the external turning tool on the grinding member 4 is detachably fixed on the tool holder by bolts, the tool holder is slidably connected to the grinding member 4, the sliding of the tool holder is perpendicular to the sliding direction of the grinding member 4, a lead screw is provided in the grinding member sliding groove 12, a lead screw and a guide rail are provided between the grinding member 4 and the tool holder, and the two ends of the two lead screws are respectively driven to rotate by two motors.

[0056] Working principle: During positioning, the first journal 51 on the cross shaft 5 is slidably connected inside the positioning clamp 322, and the other two journals 51 on the cross shaft 5 that are perpendicular to the first journal 51 are rotatably connected inside the fixed clamp 321. By aligning the two rotating shafts on the cross shaft 5 with the first axis 91 and the second axis 92 respectively, the center point of the cross shaft 5 is positioned at the rotation center of the inner ring 32. During grinding, the positioning clamp 322 is loosened to enable the cross shaft 5 to rotate 90 degrees around the first axis 91. The clamping member 3 slides on the workbench 1 so that the rotated outer journal 51 is aligned with the clamping hole on the chuck 2 and inserted for fixation. The chuck 2 is started to drive the cross shaft 5 to rotate. At this time, the inner ring 32 is fixed outside the cross shaft 5 and rotates with the cross shaft 5. The fixed clamp 321 always fixes the two journals 51 located on the first axis 91, and the grinding member 4 is slid to the side of one journal 51 facing away from the chuck 2 to grind it.

[0057] In summary, for the device used for cross-axis grinding, the outer ring 31 is slidably connected to the workbench 1, and the inner ring 32 is rotatably connected inside the outer ring 31. By arranging two fixed clamps 321 and a positioning clamp 322 inside the inner ring 32, where the positioning clamp 322 is fixed inside the inner ring 32 and the fixed clamp 321 is connected to the inner ring 32 in a lifting manner. First, the first journal 51 on the cross-axis 5 is fixed by the positioning clamp 322. At this time, the journal 51 slides back and forth between the two half-ring clamps 302 inside the positioning clamp 322. The cross-axis 5 is slid to the position aligned with the fixed clamp 321, and the height of the fixed clamp 321 is adjusted to clamp the upper and lower journals 51. At this time, the journal 51 is rotatably connected between the two half-ring clamps 302 inside the fixed clamp 321. The center point of the cross-axis 5 after clamping is aligned with the rotation center of the inner ring 32. Then, the positioning clamp 322 is loosened to rotate the cross-axis 5, so that the journal 51 on one side of the cross-axis 5 is clamped inside the chuck 2. The cross-axis 5 is driven to rotate by the chuck 2, and the journal 51 on the other side is ground by the external turning tool on the grinding part 4, achieving the purpose of adapting to cross-axes 5 of different sizes, and the rotation of the chuck 2 makes the grinding accuracy of the journal 51 on the external turning tool higher.

[0058] For the device used for cross-axis grinding, by arranging a nozzle pipe 324 on the outer side of the inner ring 32, the nozzle pipe 324 also rotates during the rotation of the inner ring 32, so that the coolant or air flow ejected from the nozzle pipe 324 can rotate around the journal 51 for spraying, improving the cooling and cleaning effects.

[0059] For the device used for cross-axis grinding, by fixedly arranging a push rod 306 on the fixed clamp 321, the push rod 306 rises and falls with the lifting of the clamp seat 301, and then the outer end of the push rod 306 is rotatably connected to the nozzle 3241 of the nozzle pipe 324. When the length of the journal 51 on the cross-axis 5 from the center of the circle is long, when clamping, the fixed clamp 321 needs to slide outwards to adapt to the length of the journal 51, and the outward sliding of the fixed clamp 321 drives the push rod 306 to slide outwards. The outward sliding of the push rod 306 makes the spraying angle of the nozzle 3241 rotate outwards, so as to automatically adapt to journals 51 of different lengths, and make the air flow and coolant in the nozzle 3241 accurately sprayed onto the journal 51.

[0060] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0061] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An apparatus for cross shaft grinding, comprising a workbench (1), characterized in that, A chuck (2), a clamping member (3) and a grinding member (4) which are slidably connected to a workbench (1) are arranged on the workbench (1). The chuck (2) is used for clamping a journal (51) on one side of a cross shaft (5) and driving the cross shaft (5) to rotate. An external turning tool for grinding the journal (51) on the other side is arranged on the grinding member (4). The clamping member (3) is used for clamping and fixing the remaining two journals (51). The clamping member (3) includes an outer ring (31) slidably connected to the workbench (1) and an inner ring (32) rotatably connected to the inner side of the outer ring (31). Two fixing clamps (321) and a positioning clamp (322) are arranged on the inner side of the inner ring (32). The line connecting the two fixing clamps (321) is a first axis (91). The first axis (91) passes through the rotation center of the inner ring (32). The line connecting the rotation center of the inner ring (32) and the positioning clamp (322) is a second axis (92). The first axis (91) is perpendicular to the second axis (92). Both the fixing clamp (321) and the positioning clamp (322) include a clamp seat (301) connected to the inner side of the inner ring (32) and two semi-ring clamps (302) symmetrically slidable on the clamp seat (301). The clamp seat (301) on the fixing clamp (321) is connected to the inner side of the inner ring (32) in a lifting manner. The clamp seat (301) on the positioning clamp (322) is fixedly connected to the inner side of the inner ring (32). Limiting bumps (303) are further arranged on the inner sides of the semi-ring clamps (302) on the two fixing clamps (321).

2. The device for cross shaft grinding according to claim 1, characterized in that, A part of the inner side of the outer ring (31) is in contact with a part of the outer side of the inner ring (32) and they are rotatably connected to each other. A spray pipe (324) is arranged on the part of the outer side of the inner ring (32) outside the outer ring (31). A nozzle (3241) is arranged at the tail of the spray pipe (324). The end of the nozzle (3241) is bent inward and faces the surface of the journal (51) on the side away from the chuck (2). The spray pipe (324) sprays air flow or coolant around the journal (51) as the inner ring (32) rotates.

3. The device for cross shaft grinding according to claim 2, characterized in that, The nozzle (3241) is connected to the main body part of the spray pipe (324) through a hose (3242). A push rod (306) is fixedly connected to the clamp seat (301) on the fixing clamp (321). The push rod (306) passes through the inner ring (32). The outer end of the push rod (306) is rotatably connected to the nozzle (3241). The height of the fixing clamp (321) is adjusted according to the length of the cross shaft (5). When the fixing clamp (321) moves up and down, the push rod (306) is driven to move up and down. The movement of the push rod (306) up and down can adjust the angle of the nozzle (3241), so that the nozzle (3241) adjusts the spraying angle according to the length of the cross shaft (5), and the air flow or coolant in the nozzle (3241) can be accurately sprayed on the journals (51) of different sizes to complete cleaning.

4. The device for cross shaft grinding according to claim 3, characterized in that, An outer ring airway (311) is provided inside the outer ring (31). A connecting pipe (312) is further provided on the outside of the outer ring (31). The connecting pipe (312) communicates with the outer ring airway (311). An inner ring cavity (323) is provided inside the inner ring (32). The inner ring cavity (323) communicates with the outer ring airway (311) at the connection between the outer ring (31) and the inner ring (32). The nozzle (324) communicates with the inner ring cavity (323).

5. The device for cross shaft grinding according to claim 4, characterized in that, The connecting pipe (312) is connected to a high-pressure air pump through a hose, or the connecting pipe (312) is connected to a coolant pool provided with a water pump through a hose.

6. The device for cross shaft grinding according to claim 1, characterized in that, A clamping part sliding groove (11) is provided on the workbench (1). An outer ring seat (313) is fixed below the outer ring (31). The outer ring seat (313) slides in the clamping part sliding groove (11). A lead screw and a guide post are provided in the clamping part sliding groove (11). Threaded holes and through holes are provided on the outer ring seat (313) corresponding to the positions of the lead screw and the guide post. The lead screw is driven to rotate by a motor, thereby driving the outer ring seat (313) to slide in the clamping part sliding groove (11).

7. The device for cross shaft grinding according to claim 1, characterized in that, A rotating screw (307) is provided inside the clamping seat (301). Threads meshing with the rotating screw (307) are provided at the bottom of the semi-circular clamp (302). When the rotating screw (307) rotates, the two semi-circular clamps (302) slide relative to or away from each other.

8. A device for grinding a cross shaft according to claim 1, characterized in that, A rotating screw (307) is provided inside the clamping seat (301). The thread rotation directions at the front and rear ends of the rotating screw (307) are opposite. Alternatively, two rotating screws (307) are provided inside the clamping seat (301). The thread rotation directions on the two rotating screws (307) are the same. Gears meshing with each other are provided at the ends of the two rotating screws (307), so that when one rotating screw (307) rotates, the other rotating screw (307) rotates in the opposite direction.

9. The device for cross shaft grinding according to claim 3, characterized in that, Inside any fixed clamp (321), a rotating nut (304) is rotatably connected to the clamping seat (301). A fixed screw (305) is fixed at the position on the inner side of the inner ring (32) corresponding to the rotating nut (304). The height of the fixed clamp (321) is adjusted by rotating the rotating nut (304). At the same time, the ejector rod (306) functions as a guide post to prevent the whole fixed clamp (321) from rotating.

10. A device for cross shaft grinding according to claim 1, characterized in that, The grinding part (4) is slidably connected in a grinding part sliding groove (12) on the workbench (1). The sliding direction of the grinding part sliding groove (12) is parallel to the sliding direction of the clamping part (3). The external turning tool on the grinding part (4) is detachably fixed to the tool holder through bolts. The tool holder is slidably connected to the grinding part (4). The sliding of the tool holder is perpendicular to the sliding direction of the grinding part (4). A lead screw is provided in the grinding part sliding groove (12). A lead screw and a guide rail are provided between the grinding part (4) and the tool holder. The two ends of the lead screw are respectively driven to rotate by two motors.

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