Equipment for grinding cross shaft

Abstract

The invention relates to the technical field of universal joint pin grinding, and discloses universal joint pin grinding equipment which comprises a workbench, a chuck, a clamping piece and a grinding piece are arranged on the workbench, the chuck is used for clamping a shaft neck on one side of a universal joint pin and driving the universal joint pin to rotate, and an outer circle turning tool used for grinding a shaft neck on the other side is arranged on the grinding piece. The clamping piece is used for clamping and fixing the remaining two journals, the clamping piece comprises an outer ring and an inner ring rotationally connected to the inner side of the outer ring, and two fixing clamps and a positioning clamp are arranged on the inner side of the inner ring; each of the fixing clamps and the positioning clamps comprises a clamping seat connected to the inner side of the inner ring and two semi-ring clamps symmetrically sliding on the clamping seat, the clamping seats on the fixing clamps are connected to the inner side of the inner ring in a lifting manner, the clamping seats on the positioning clamps are fixedly connected to the inner side of the inner ring, and limiting convex blocks are further arranged on the inner sides of the semi-ring clamps on the two fixing clamps; the device has the advantages of being capable of automatically adapting to cross shafts of different sizes, high in grinding precision and good in cooling effect and cleaning effect.

Description

Technical Field

[0001] The invention relates to the technical field of cross shaft grinding, in particular to a device for grinding a cross shaft. 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, engineering machinery, and aerospace. Its quality and precision have a vital 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, and the requirements for their processing accuracy and surface quality are also getting higher and higher.

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

[0004] Manual grinding depends on the experience and skills of the workers. The quality of the cross shafts polished by different workers varies, and it is difficult to ensure high and stable accuracy. When grinding key parts such as the journal and shoulder of the cross shaft, it is easy to have excessive dimensional deviation, which affects the matching accuracy between the cross shaft and other parts. Patent publication number CN113352159A discloses a surface grinding device for cross shaft processing. The patent uses a grinding sleeve to move back and forth during grinding. The grinding accuracy is low and the efficiency is poor. At the same time, it is also impossible to automatically adjust the height according to different sizes of cross shafts. The waste generated during grinding cannot be cleaned in time, and the heat generated by grinding will also affect the grinding accuracy. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides a device for grinding cross shafts, which has the advantages of automatically adapting to cross shafts of different sizes, high grinding precision, good cooling effect and cleaning effect, and solves the problems in the above-mentioned background technology.

[0006] (II) Technical solution To achieve the above object, the present invention provides the following technical solutions: A device for grinding a cross shaft comprises a workbench, the workbench is provided with a chuck and a clamping piece and a grinding piece slidably connected to the workbench, the chuck is used to clamp the journal on one side of the cross shaft and drive the cross shaft to rotate, the grinding piece is provided with an external cylindrical turning tool for grinding the journal on the other side, the clamping piece is used to clamp and fix the remaining two journals, the clamping piece comprises an outer ring slidably connected to the workbench and an inner ring rotatably connected to the inner side of the outer ring, two fixing clamps and a positioning clamp are provided on the inner side of the inner ring, the connection line between the two fixing clamps is a first axis, the first axis passes through the rotation center of the inner ring, the connection line between the rotation center of the inner ring and the positioning clamp is a second axis, and the first axis is perpendicular to the second axis; The fixing clamp and the positioning clamp both 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 fixing clamp is lifted and connected to the inner side of the inner ring. The clamp seat on the positioning clamp is fixedly connected to the inner side of the inner ring. The inner sides of the half-ring clamps on the two fixing clamps are also provided with limiting protrusions. During positioning, the first journal on the cross shaft is slidably connected in the positioning clamp, and the other two journals on the cross shaft that are perpendicular to the first journal are rotatably connected in the fixing clamp. The center point of the cross shaft is positioned at the rotation center of the inner ring by aligning the two rotating axes on the cross shaft with the first axis and the second axis respectively. During grinding, the positioning clamp is released to rotate the cross shaft 90 degrees around the first axis. The clamp is slid on the workbench so that the journal rotated to the outside is aligned with the clamping hole on the chuck and inserted to complete the fixation. The chuck is started to drive the cross shaft to rotate. At this time, the inner ring is fixed on the outside of the cross shaft and rotates with the rotation of the cross shaft. The fixing clamp always fixes the two journals on the first axis, and grinds it by sliding the grinding piece to the side of a journal facing away from the chuck.

[0007] Preferably, an inner portion of the outer ring contacts an outer portion of the inner ring and are rotatably connected to each other, a nozzle is provided on the outer portion of the inner ring outside the outer ring, a nozzle is provided at the tail of the nozzle, an end of the nozzle is bent inwardly toward the journal surface away from the chuck, and the nozzle sprays air flow or coolant around the journal as the inner ring rotates.

[0008] Preferably, the nozzle is connected to the main body through a hose, and a push rod is fixedly connected to the clamp seat on the fixing clamp. The push rod passes through the inner ring, and the outer end of the push rod is rotatably connected to the nozzle. The height of the fixing clamp is adjusted according to the length of the cross axis. The lifting and lowering of the fixing clamp drives the push rod to move up and down. The lifting and lowering of the push rod can adjust the angle of the nozzle, so that the nozzle can adjust the spraying angle according to the length of the cross axis, so that the nozzle can accurately spray on shaft necks of different sizes to complete cleaning.

[0009] Preferably, an outer ring air duct is arranged inside the outer ring, a connecting pipe is also arranged outside the outer ring, the connecting pipe is connected to the outer ring air duct, an inner ring cavity is arranged inside the inner ring, the inner ring cavity is connected to the outer ring air duct at the connection between the outer ring and the inner ring, and the nozzle is connected to the inner ring cavity.

[0010] Preferably, the connecting pipe is connected to the high-pressure air pump via a hose, or the connecting pipe is connected to a coolant tank provided with a water pump via a hose.

[0011] Preferably, a clamping piece sliding groove is provided on the workbench, an outer ring seat is fixed under the outer ring, the outer ring seat slides in the clamping piece sliding groove, a screw rod and a guide column are provided in the clamping piece sliding groove, threaded holes and through holes are provided on the outer ring seat at positions corresponding to the screw rod and the guide column, the screw rod is driven to rotate by a motor, thereby driving the outer ring seat to slide in the clamping piece sliding groove.

[0012] Preferably, a rotating screw is provided in the clamp seat, and a thread meshing with the rotating screw is provided at the bottom of the half-ring clamp, and when the rotating screw rotates, the two half-ring clamps slide relative to or back to back.

[0013] Preferably, a rotating screw is provided in the clamp seat, and the threads on the front and rear ends of the rotating screw rotate in opposite directions; or, two rotating screws are provided in the clamp seat, the threads on the two rotating screws rotate in the same direction, and the ends of the two rotating screws are provided with gears that mesh with each other, so that when one rotating screw is rotated, the other rotating screw rotates in the opposite direction.

[0014] Preferably, in any fixed clamp, a rotating nut is rotatably connected to the clamp seat, and a fixing screw is fixed on the inner side of the inner ring at a position corresponding to the rotating nut. The height of the fixed clamp is adjusted by rotating the rotating nut, and the push rod acts as a guide column to prevent the fixed clamp from rotating as a whole.

[0015] 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 cylindrical turning tool on the grinding part is detachably fixed to the turning tool seat by bolts, the turning tool seat is slidably connected to the grinding part, the sliding of the turning tool seat is perpendicular to the sliding direction of the grinding part, a screw rod is arranged in the grinding part sliding groove, a screw rod and a guide rail are arranged between the grinding part and the turning tool seat, and the two ends of the screw rod are driven to rotate by two motors respectively.

[0016] (III) Beneficial effects Compared with the prior art, the present invention provides a device for grinding a cross shaft, which has the following beneficial effects: The outer ring is connected to the workbench by sliding, and the inner ring is connected to the outer ring by rotation. Two fixing clamps and a positioning clamp are arranged on the inner side of the inner ring, wherein the positioning clamp is fixed in the inner ring, and the fixing clamp is lifted and connected in the inner ring. First, the first journal on the cross shaft is fixed by the positioning clamp. At this time, the journal slides back and forth between the two half-ring clamps in the positioning clamp, and the cross shaft is slid to the position aligned with the fixing clamp. The height of the fixing clamp is adjusted so that the fixing clamp clamps the upper and lower journals. At this time, the journal is rotationally connected between the two half-ring clamps in the fixing clamp. The center point of the cross shaft after clamping is aligned with the rotation center of the inner ring, and then the positioning clamp is released to rotate the cross shaft, so that the journal on one side of the cross shaft is clamped in the chuck, and the cross shaft is driven to rotate by the chuck, and the journal on the other side is polished by the external cylindrical turning tool on the polishing piece, so as to achieve 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 cylindrical turning tool higher.

[0017] 2. The equipment for grinding the cross shaft has a nozzle arranged on the outer side of the inner ring. The nozzle rotates during the rotation of the inner ring, so that the coolant or airflow sprayed from the nozzle can rotate and spray around the journal, thereby improving the cooling and cleaning effects.

[0018] 3. The equipment for grinding the cross shaft has a push rod fixed on a fixing clamp, which rises and falls with the lifting of a clamp seat, and then the outer end of the push rod is rotated to be connected to the nozzle of the nozzle. When the distance between the journal on the cross shaft and the center of a circle is long, the fixing clamp needs to be slid outward to adapt to the length of the journal during clamping, and the outward sliding of the fixing clamp drives the push rod to slide outward, and the outward sliding of the push rod causes the spray angle of the nozzle to rotate outward, thereby automatically adapting to journals of different lengths, so that the airflow and coolant in the nozzle can be accurately sprayed onto the journal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention during grinding.

[0020] Figure 2 It is a schematic diagram of the structure of the present invention during separation.

[0021] Figure 3 It is a schematic diagram of the structure of the clamping piece of the present invention when it is in a positioning state (three journals are respectively fixed by two fixing clamps and one positioning clamp).

[0022] Figure 4 It is a front view of the clamping member of the present invention in the positioning state.

[0023] Figure 5 It is a schematic structural diagram of the clamping piece of the present invention in a grinding state (two symmetrical journals are fixed by two fixing clamps, and the other two journals are rotated to the outside of the clamping piece).

[0024] Figure 6 It is a cross-sectional view of the clamping part of the present invention in the grinding state.

[0025] Figure 7 For the present invention Figure 6 A partial enlarged view of area A.

[0026] Figure 8 It is a schematic structural diagram of the cross shaft of the present invention.

[0027] Fig. 9 It is a schematic diagram of the structure of the inner ring of the present invention.

[0028] Fig.10 It is a schematic diagram of the structure of the outer ring of the present invention.

[0029] Fig.11 It is a schematic structural diagram of the positioning clip of the present invention being fixed on the inner side of the inner ring.

[0030] Fig.12 It is a schematic diagram of the structure in which the fixing clamp of the present invention is lifted and connected to the inner side of the inner ring.

[0031] Fig.13 It is a structural schematic diagram of the connection relationship between the semi-ring clamp and the rotating screw inside the clamp seat of the present invention.

[0032] 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. outer ring airway; 312. connecting pipe; 313. outer ring seat; 32. inner ring; 321. fixing clamp; 322. positioning clamp; 323. inner ring cavity; 324. nozzle; 3241. nozzle; 3242. hose; 301. clamp seat; 302. half ring clamp; 303. limiting protrusion; 304. rotating nut; 305. fixing screw; 306. push rod; 307. rotating screw; 51. journal; 91. first axis; 92. second axis. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0034] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] Embodiment 1: This embodiment provides a device for grinding a cross shaft, which has the following technical features.

[0037] See also Figure 1-13 , a device for grinding a cross shaft, comprising a workbench 1, a chuck 2 and a clamping piece 3 and a grinding piece 4 slidably connected to the workbench 1 are arranged on 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, the grinding piece 4 is provided with an external cylindrical turning tool for grinding the journal 51 on the other side, the clamping piece 3 is used to clamp and fix the remaining two journals 51, the clamping piece 3 comprises 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 connection line between 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 connection line between the rotation center of the inner ring 32 and the positioning clamp 322 is a second axis 92, and the first axis 91 is perpendicular to the second axis 92; 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 that slide symmetrically 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 for lifting, and the clamp seat 301 on the positioning clamp 322 is fixedly connected to the inner side of the inner ring 32. Limiting protrusions 303 are also provided on the inner sides of the half-ring clamps 302 on the two fixed clamps 321.

[0038] In an optional embodiment, an inner portion of the outer ring 31 contacts an outer portion of the inner ring 32 and is rotatably connected to each other. A nozzle 324 is provided on the outer side of the inner ring 32 outside the outer ring 31. A nozzle 3241 is provided at the tail of the nozzle 324. The end of the nozzle 3241 is bent inwardly toward the surface of the journal 51 away from the side of the chuck 2. The nozzle 324 sprays air flow or coolant around the journal 51 as the inner ring 32 rotates.

[0039] In an optional embodiment, the nozzle 3241 is connected to the main body through a hose 3242, and a push rod 306 is fixedly connected to the clamp seat 301 on the fixed clamp 321. The push rod 306 passes through the inner ring 32, and the outer end of the push rod 306 is rotatably connected to the nozzle 3241. The height of the fixed clamp 321 is adjusted according to the length of the cross shaft 5. When the fixed clamp 321 is raised or lowered, the push rod 306 is driven to rise or fall. The lifting of the push rod 306 can adjust the angle of the nozzle 3241, so that the nozzle 3241 can adjust the spraying angle according to the length of the cross shaft 5, so that the nozzle 3241 can accurately spray on the shaft necks 51 of different sizes to complete cleaning.

[0040] In an optional embodiment, an outer ring air channel 311 is provided inside the outer ring 31, and a connecting pipe 312 is also provided outside the outer ring 31, the connecting pipe 312 is connected to the outer ring air channel 311, an inner ring cavity 323 is provided inside the inner ring 32, the inner ring cavity 323 is connected to the outer ring air channel 311 at the connection between the outer ring 31 and the inner ring 32, and the nozzle 324 is connected to the inner ring cavity 323.

[0041] In an optional embodiment, the connecting pipe 312 is connected to the high-pressure air pump through a hose, or the connecting pipe 312 is connected to a coolant tank provided with a water pump through a hose.

[0042] In an optional embodiment, a clamping member sliding groove 11 is provided on the workbench 1, an outer ring seat 313 is fixed under the outer ring 31, the outer ring seat 313 slides in the clamping member sliding groove 11, a screw rod and a guide column are provided in the clamping member sliding groove 11, threaded holes and through holes are provided on the outer ring seat 313 at positions corresponding to the screw rod and the guide column, the screw rod is driven to rotate by a motor, thereby driving the outer ring seat 313 to slide in the clamping member sliding groove 11.

[0043] In an optional embodiment, a rotating screw 307 is disposed in the clamp seat 301, and a thread meshing with the rotating screw 307 is disposed at the bottom of the half-ring clamp 302. When the rotating screw 307 rotates, the two half-ring clamps 302 slide relative to or back to back.

[0044] In an optional embodiment, a rotating screw 307 is provided in the clamping base 301, and the threads on the front and rear ends of the rotating screw 307 rotate in opposite directions; or, two rotating screws 307 are provided in the clamping base 301, and the threads on the two rotating screws 307 rotate in the same direction, and the ends of the two rotating screws 307 are provided with gears that mesh with each other, so that when one rotating screw 307 is rotated, the other rotating screw 307 rotates in the opposite direction.

[0045] In an optional embodiment, in any fixed clamp 321, a rotating nut 304 is rotatably connected to the clamp seat 301, and a fixing screw 305 is fixed on the inner side of the inner ring 32 at a position corresponding to the rotating nut 304. The height of the fixed clamp 321 is adjusted by rotating the rotating nut 304, and the push rod 306 acts as a guide column to prevent the fixed clamp 321 from rotating as a whole.

[0046] In an optional embodiment, the grinding piece 4 is slidably connected in the grinding piece sliding groove 12 on the workbench 1, and the sliding direction of the grinding piece sliding groove 12 is parallel to the sliding direction of the clamping piece 3. The external cylindrical turning tool on the grinding piece 4 is detachably fixed to the turning tool seat by bolts, and the turning tool seat is slidably connected to the grinding piece 4. The sliding of the turning tool seat is perpendicular to the sliding direction of the grinding piece 4. A screw rod is arranged in the grinding piece sliding groove 12, and a screw rod and a guide rail are arranged between the grinding piece 4 and the turning tool seat, and the two ends of the screw rod are driven to rotate by two motors respectively.

[0047] Working principle: During positioning, the first journal 51 on the cross shaft 5 is slidably connected in 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 in the fixing clamp 321. The center point of the cross shaft 5 is positioned at the rotation center of the inner ring 32 by aligning the two rotating axes on the cross shaft 5 with the first axis 91 and the second axis 92 respectively. During grinding, the positioning clamp 322 is released to rotate the cross shaft 5 90 degrees around the first axis 91. The clamp 3 slides on the workbench 1 so that the journal 51 rotated to the outside is aligned with the clamping hole on the chuck 2 and inserted to complete the fixation. The chuck 2 is started to drive the cross shaft 5 to rotate. At this time, the inner ring 32 is fixed on the outside of the cross shaft 5 and rotates with the rotation of the cross shaft 5. The fixing clamp 321 always fixes the two journals 51 on the first axis 91, and grinds the side of a journal 51 facing away from the chuck 2 by sliding the grinding piece 4.

[0048] In summary, in the equipment for grinding the cross shaft, the outer ring 31 is slidably connected to the workbench 1, and the inner ring 32 is rotatably connected inside the outer ring 31. Two fixing clamps 321 and a positioning clamp 322 are arranged on the inner side of the inner ring 32, wherein the positioning clamp 322 is fixed inside the inner ring 32, and the fixing clamp 321 is lifted and connected inside the inner ring 32. First, the first journal 51 on the cross shaft 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 in the positioning clamp 322, and the cross shaft 5 is slid to the position aligned with the fixing clamp 321, and the height of the fixing clamp 321 is adjusted. The fixing clamp 321 clamps the upper and lower journals 51. At this time, the journal 51 is rotated and connected between the two half-ring clamps 302 in the fixing clamp 321. The center point of the cross shaft 5 after clamping is aligned with the rotation center of the inner ring 32. Then the positioning clamp 322 is released to rotate the cross shaft 5, so that the journal 51 on one side of the cross shaft 5 is clamped in the chuck 2. The cross shaft 5 is driven to rotate by the chuck 2, and the journal 51 on the other side is ground by the external cylindrical turning tool on the grinding piece 4, thereby achieving the purpose of adapting to cross shafts 5 of different sizes. In addition, the rotation of the chuck 2 makes the grinding accuracy of the journal 51 on the external cylindrical turning tool higher.

[0049] The cross-shaft grinding device has a nozzle 324 disposed on the outer side of the inner ring 32. The nozzle 324 rotates during the rotation of the inner ring 32, so that the coolant or airflow sprayed from the nozzle 324 can rotate and spray around the journal 51, thereby improving the cooling and cleaning effects.

[0050] The equipment for grinding a cross shaft comprises a push rod 306 fixedly arranged on a fixing clamp 321, and the push rod 306 rises and falls with the rise and fall of a clamp seat 301, and then the outer end of the push rod 306 is rotated to be connected to a nozzle 3241 of a nozzle 324. When the distance between a journal 51 on a cross shaft 5 and a center of a circle is long, the fixing clamp 321 needs to be slid outward to adapt to the length of the journal 51 during clamping, and the outward sliding of the fixing clamp 321 drives the push rod 306 to slide outward, and the outward sliding of the push rod 306 causes the spray angle of the nozzle 3241 to rotate outward, thereby automatically adapting to journals 51 of different lengths, so that the airflow and coolant in the nozzle 3241 are accurately sprayed onto the journal 51.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for grinding a cross shaft, comprising a workbench (1), characterized in that: The workbench (1) is provided with a chuck (2), a clamping piece (3) and a grinding piece (4) 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; the grinding piece (4) is provided with an external cylindrical turning tool for grinding the journal (51) on the other side; and the clamping piece (3) is used to clamp and fix the remaining two journals (51); The clamping member (3) comprises 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); a 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); a 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); The fixing clamp (321) and the positioning clamp (322) both include a clamp seat (301) connected to the inner side of the inner ring (32) and two half-ring clamps (302) symmetrically sliding 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, and the clamp seat (301) on the positioning clamp (322) is fixedly connected to the inner side of the inner ring (32); A limiting protrusion (303) is also provided on the inner side of the semi-ring clamp (302) on the two fixing clamps (321).

2. The device for grinding a cross shaft according to claim 1, characterized in that: An inner portion of the outer ring (31) contacts an outer portion of the inner ring (32) and is rotatably connected to each other. A nozzle (324) is provided on the outer side of the inner ring (32) outside the outer ring (31). A nozzle (3241) is provided at the tail of the nozzle (324). The end of the nozzle (3241) is bent inwardly toward the surface of the journal (51) away from the chuck (2). The nozzle (324) sprays air flow or cooling liquid around the journal (51) as the inner ring (32) rotates.

3. The device for grinding a cross shaft according to claim 2, characterized in that: The nozzle (3241) is connected to the main body via 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); the lifting and lowering of the fixing clamp (321) drives the push rod (306) to lift and lower; the lifting and lowering of the push rod (306) can adjust the angle of the nozzle (3241), so that the nozzle (3241) can adjust the spraying angle according to the length of the cross shaft (5), so that the airflow or coolant in the nozzle (3241) can be accurately sprayed on the journals (51) of different sizes to complete the cleaning.

4. The device for grinding a cross shaft according to claim 3, characterized in that: An outer ring air passage (311) is arranged inside the outer ring (31), and a connecting pipe (312) is also arranged outside the outer ring (31), the connecting pipe (312) is connected to the outer ring air passage (311), an inner ring cavity (323) is arranged inside the inner ring (32), the inner ring cavity (323) is connected to the outer ring air passage (311) at the connection between the outer ring (31) and the inner ring (32), and the nozzle (324) is connected to the inner ring cavity (323).

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

6. The device for grinding a cross shaft according to claim 1, characterized in that: The workbench (1) is provided with a clamping member sliding groove (11), an outer ring seat (313) is fixed below the outer ring (31), the outer ring seat (313) slides in the clamping member sliding groove (11), a screw rod and a guide column are provided in the clamping member sliding groove (11), threaded holes and through holes are provided on the outer ring seat (313) at positions corresponding to the screw rod and the guide column, the screw rod is driven to rotate by a motor, thereby driving the outer ring seat (313) to slide in the clamping member sliding groove (11).

7. The device for grinding a cross shaft according to claim 1, characterized in that: A rotating screw (307) is arranged in the clamp seat (301), and a thread meshing with the rotating screw (307) is arranged at the bottom of the semi-ring clamp (302). When the rotating screw (307) rotates, the two semi-ring clamps (302) slide relative to or back to back.

8. The device for grinding a cross shaft according to claim 1, characterized in that: A rotating screw rod (307) is disposed in the clamping seat (301), and the threads on the front and rear ends of the rotating screw rod (307) rotate in opposite directions; Alternatively, two rotating screws (307) are arranged in the clamping seat (301), the threads on the two rotating screws (307) rotate in the same direction, and the ends of the two rotating screws (307) are provided with gears meshing with each other, so that when one rotating screw (307) is rotated, the other rotating screw (307) rotates in the opposite direction.

9. The device for grinding a cross shaft according to claim 1, characterized in that: In any fixed clamp (321), a rotating nut (304) is rotatably connected to the clamp seat (301), and a fixing screw (305) is fixed on the inner side of the inner ring (32) at a position corresponding to the rotating nut (304). The height of the fixed clamp (321) is adjusted by rotating the rotating nut (304), and the push rod (306) acts as a guide column to prevent the fixed clamp (321) from rotating as a whole.

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

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