Grinding device for large-lead-angle long nut

Abstract

The invention relates to the technical field of grinding equipment, in particular to a grinding device for a large-lead-angle long nut, which comprises a workbench, the left end of the workbench is connected with a positioning cylinder through a first electric telescopic arm, the positioning cylinder is slidably connected with an outer connecting plate, and the outer connecting plate is provided with second electric telescopic arms which are uniformly distributed; the cooling liquid inlet pipe is slidably sleeved with a cooling liquid extending pipe, and a lower inclined pipe at the tail end of the cooling liquid extending pipe is rotatably sleeved with an upper buffering connecting pipe. A right supporting plate and a grinding motor are fixedly connected to the right side of the workbench, a first bevel gear is installed on an output shaft, and the first bevel gear is meshed with a second bevel gear. An upper buffering connecting pipe and a lower buffering connecting pipe are connected, a first electric telescopic arm stretches, the clamped long nut gradually moves towards a grinding wheel, and a cooling liquid inlet pipe synchronously moves to wrap a cooling liquid extending pipe; large-lead-angle grinding is achieved in a small space, grinding cooling liquid is directly sprayed out from the interior of the grinding wheel for cooling, and the grinding temperature is remarkably reduced.

Description

Technical Field

[0001] The invention relates to the technical field of grinding equipment, and in particular to a grinding device for long nuts with large lead angles. Background Art

[0002] With the development of linear servo motor technology, the requirements for planetary roller screws are getting higher and higher, and higher precision requirements are put forward for the long nuts. When grinding long nuts, if the parallel axis method is used, there will be interference between the grinding wheel and the internal thread, and the processing roughness and taper cannot meet the requirements.

[0003] Chinese patent CN 113059240B discloses a method for precision grinding of internal threads, in which the grinding wheel can perform online dressing of the grinding wheel after completing a grinding stroke on the internal thread of the workpiece, so that the center axis of the grinding wheel and the center axis of the nut are at a certain angle for grinding, thereby ensuring that there is no interference between the grinding wheel and the nut, and improving production efficiency and precision. However, this is generally applicable to nuts with a small aspect ratio. For long nuts, because their aspect ratio is relatively large, if a certain angle is still maintained, the grinding wheel rod will collide with the top of the threaded hole, resulting in inability to perform in-depth processing. And because the grinding depth is large, in order to ensure the accuracy and rigidity requirements, a grinding wheel with a larger diameter needs to be selected, and the interference size is also larger.

[0004] In addition, during the grinding process, due to the violent plastic deformation and friction, a large amount of grinding heat is generated in the grinding area between the grinding wheel and the nut. If the heat cannot be dissipated in time, burns, cracks and other undesirable phenomena will occur on the internal threads of the nut, seriously affecting the processing quality of the workpiece. Traditionally, cooling is performed by setting a nozzle to pour coolant on the outside of the grinding wheel. However, during the operation of the grinding wheel, a certain thickness of air flow layer is formed around it, which will hinder the external coolant from entering the grinding area, so the workpiece cannot be effectively cooled. In addition, the coolant on the grinding surface will vaporize when the grinding surface is at a high temperature, forming a gas barrier insulation film between the grinding surface and the coolant, also known as film boiling, which blocks the heat dissipation from the grinding surface to the liquid surface, causing damage to the workpiece surface. Summary of the invention

[0005] In view of the shortcomings of the above-mentioned prior art, the present invention provides a grinding device for long nuts with large lead angles, which can achieve large lead angle grinding in a smaller space and avoid the problem that the transmission shaft and the long nut abut against each other and the entire grinding process cannot be completed; the grinding coolant is directly sprayed from the inside of the grinding wheel for cooling, which effectively avoids the influence of the air flow layer generated by the rotation around the grinding wheel, significantly reduces the grinding temperature, and reduces thermal damage to the internal threads of the long nuts.

[0006] A grinding device for long nuts with large lift angles, comprising a workbench, the left end of which is connected to a positioning cylinder via a No. 1 electric telescopic arm, the positioning cylinder being slidably connected to an outer connecting plate, the outer connecting plate being mounted with a No. 2 electric telescopic arm evenly distributed, the end of the No. 2 electric telescopic arm being fixedly connected to a clamping sheet, the positioning cylinder being penetrated and connected to a coolant inlet pipe, the coolant inlet pipe being slidably sleeved with a coolant extension pipe, the end of the coolant extension pipe being provided with a lower oblique pipe, the lower oblique pipe being rotatably sleeved with an upper buffer connecting pipe; The right side of the workbench is fixedly connected with a right support plate and a grinding motor, the right support plate is provided with a propulsion shaft, the output shaft of the grinding motor rotates and penetrates the propulsion shaft, a No. 1 bevel gear is installed at the end of the output shaft, a mounting block is welded at one end of the propulsion shaft close to the No. 1 bevel gear to form a mounting cavity, a transmission shaft is rotatably sleeved on the mounting block, a No. 2 bevel gear is installed on the transmission shaft, the No. 2 bevel gear meshes with the No. 1 bevel gear in the mounting cavity, a support block is fixedly connected with the mounting block at a position close to the No. 2 bevel gear, the support block is provided with a ball groove, and the transmission shaft is rotatably abutted against the ball in the ball groove; The outer end of the transmission shaft is connected to a grinding wheel, the grinding wheel is provided with a central cavity, the central cavity is connected to a T-shaped liquid outlet channel, the outer end of the transmission shaft is provided with an inner channel, the top end of the inner channel is slidably sleeved with a lower buffer connecting pipe, and the bottom end of the inner channel is connected to the central cavity through a through hole; The No. 2 electric telescopic arm extends synchronously, and the clamping piece clamps the long nut; the upper buffer connecting tube and the lower buffer connecting tube are on the same axis, the lower buffer connecting tube is slid, and the upper buffer connecting tube is rotated, and the upper buffer connecting tube and the lower buffer connecting tube rotate with the transmission shaft; the No. 1 electric telescopic arm extends, and the clamped long nut gradually moves toward the grinding wheel, and the coolant inlet pipe moves synchronously to wrap the coolant extension pipe.

[0007] Furthermore, the transmission shaft is threadedly connected with a limit nut, one side of the grinding wheel abuts against the limit nut, and the other side of the grinding wheel abuts against the limit block of the transmission shaft, and the limit nut is provided with a through hole that matches the lower buffer connecting tube.

[0008] Furthermore, an air cooling channel is provided at the right end of the installation cavity, the air cooling channel is connected to an external hose, and a gas outlet is provided at the bottom end of the installation cavity near the second bevel gear, and a waterproof breathable membrane is installed at the gas outlet.

[0009] Furthermore, the outer wall of the positioning cylinder is provided with a No. 1 slide rail, the outer connecting plate includes a connecting ring and a branch plate, the connecting ring is provided with a No. 1 slider matching the No. 1 slide rail, the No. 2 electric telescopic arm is fixedly installed on the branch plate, and the clamping plate is provided with an extension block. The No. 1 slider slides to the end of the No. 1 slide rail, the No. 2 electric telescopic arm extends, and the extension block abuts against the end of the positioning cylinder.

[0010] Furthermore, the inner wall of the upper buffer connecting tube is provided with an L-shaped groove, and the outer wall of the lower buffer connecting tube is provided with a straight-shaped protrusion. The lower buffer connecting tube is slid upward, and the straight-shaped protrusion enters the first groove of the L-shaped groove. The upper buffer connecting tube is rotated in the opposite direction of the rotation of the grinding wheel until the straight-shaped protrusion abuts against the end of the second groove of the L-shaped groove.

[0011] Furthermore, a No. 1 indicator line is provided on the outer wall of the upper buffer connecting tube, a No. 2 indicator line is provided on the outer wall of the lower buffer connecting tube, the I-shaped protrusion abuts against the end of the second groove of the L-shaped groove, and the No. 1 indicator line is aligned with the No. 2 indicator line.

[0012] Furthermore, the positioning cylinder is provided with a left supporting plate, and the bottom end of the left supporting plate is slidably connected to the workbench.

[0013] Furthermore, a No. 2 slide rail is provided at the bottom end of the left support plate, and a brush is provided on the inner wall of the No. 2 slide rail, and the brush is movably abutted against the No. 2 slide block of the workbench.

[0014] Furthermore, the mounting block is provided with protrusions evenly distributed along the circumference, and the propulsion shaft is provided with concave holes matching with the protrusions.

[0015] Furthermore, the right end of the coolant inlet pipe is detachably connected to a cleaning frame, and a cleaning brush is installed on the inner wall of the cleaning frame, and the cleaning brush abuts against the outer wall of the coolant extension pipe.

[0016] Due to the adoption of the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows: 1) The output shaft of the grinding motor of the present invention drives the transmission shaft to rotate through the meshing action of the first bevel gear and the second bevel gear, so that the transmission shaft can completely enter the grinding space of the long nut, and the transmission shaft and the propulsion shaft will not conflict with the long nut, thereby achieving large lead angle grinding in a smaller space, avoiding the problem that the transmission shaft abuts against the long nut and the entire grinding process cannot be completed.

[0017] 2) The present invention connects the upper buffer connecting pipe with the lower buffer connecting pipe so that the grinding coolant is directly sprayed out from the inside of the grinding wheel for cooling, effectively avoiding the influence of the air flow layer generated by the rotation around the grinding wheel, significantly reducing the grinding temperature, and reducing thermal damage to the internal thread of the long nut.

[0018] 3) When the clamping piece of the present invention clamps the long nut, the extension block abuts against the end of the positioning tube. During the extension of the No. 1 electric telescopic arm, the extension block prevents the outer connecting plate clamping the long nut from sliding to the left at will, thereby avoiding ineffective extension of the No. 1 electric telescopic arm.

[0019] 4) The present invention delivers cold air to the installation cavity through the air cooling channel to cool the transmission structure of the installation cavity, thereby preventing the bevel gear from overheating and affecting its use. The waterproof and breathable membrane at the gas outlet prevents splashing grinding coolant from entering the installation cavity.

[0020] 5) The present invention clamps the grinding wheel through the limit nut and the limit block, so that the grinding wheel rotates synchronously with the transmission shaft to perform grinding processing. After the limit nut is screwed and removed, the grinding wheel can be replaced to maintain the grinding processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure in which the center axis of the grinding wheel and the center axis of the nut are ground at a certain angle in the prior art; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 is a cross-sectional view of the present invention; Figure 4 for Figure 3 A is a schematic diagram of the enlarged structure of the middle part; Figure 5 It is a structural schematic diagram of the clamped long nut moving to the right; Figure 6 It is a schematic diagram of the structure of the outer connecting plate and the coolant extension pipe when the long nut is not clamped; Figure 7 for Figure 6 A schematic diagram of the enlarged structure of B; Figure 8 is a schematic diagram of the structure of bevel gear No. 1; Fig. 9 Schematic diagram of the structure of the upper buffer connecting pipe and the lower buffer connecting pipe; Fig.10 is a schematic diagram of the structure of the external connection plate; Fig.11 It is a schematic diagram of the structure of the cleaning rack; Figure markings, 1-workbench, 2-No. 1 electric telescopic arm, 3-positioning cylinder, 4-external connecting plate, 5-No. 2 electric telescopic arm, 6-clamping plate, 7-coolant inlet pipe, 8-coolant extension pipe, 9-upper buffer connecting pipe, 10-right support plate, 11-grinding motor, 12-propulsion shaft, 13-output shaft, 14-No. 1 bevel gear, 15-mounting block, 16-transmission shaft, 17-No. 2 bevel gear, 18-support block, 19-grinding wheel, 20-center cavity, 21-T-type liquid outlet channel, 22-inner channel, 23-lower buffer connecting pipe, 24-long nut, 25-limiting nut, 26-limiting block, 27-air cooling channel, 28-gas outlet, 29-L-shaped groove, 30-I-shaped protrusion, 31-left support plate, 32-No. 2 slider, 33-cleaning rack. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions of 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, other implementation methods or equivalent replacements obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0023] Reference Figures 2 to 8 The present invention provides a grinding device for long nuts with large lifting angles, comprising a workbench 1, the left end of the workbench 1 is connected with a positioning cylinder 3 through a No. 1 electric telescopic arm 2, the positioning cylinder 3 is slidably connected with an outer connecting plate 4, the outer connecting plate 4 is installed with a No. 2 electric telescopic arm 5 evenly distributed, the end of the No. 2 electric telescopic arm 5 is fixedly connected with a clamping piece 6, the positioning cylinder 3 is penetrated and connected with a coolant inlet pipe 7, the coolant inlet pipe 7 is slidably sleeved with a coolant extension pipe 8, the end of the coolant extension pipe 8 is provided with a lower inclined pipe, the lower inclined pipe is rotatably sleeved with an upper buffer connecting pipe 9, the other end of the coolant inlet pipe 7 is connected with a coolant hose, the coolant hose is connected with a grinding coolant tank body and conveys grinding coolant to the coolant inlet pipe 7 through a pump body, and the length of the coolant hose can be stretched to adapt to the moving distance of the positioning cylinder 3; A right support plate 10 and a grinding motor 11 are fixedly connected to the right side of the workbench 1. The right support plate 10 is provided with a propulsion shaft 12. The output shaft 13 of the grinding motor 11 rotates and passes through the propulsion shaft 12. A rolling bearing is installed between the output shaft 13 and the propulsion shaft 12. A first bevel gear 14 is installed at the end of the output shaft 13. A mounting block 15 is welded at one end of the propulsion shaft 12 close to the first bevel gear 14 to form a mounting cavity. The mounting block 15 is rotatably sleeved with a transmission shaft 16 through a rolling bearing. The transmission shaft 16 is installed with a second bevel gear 17. The second bevel gear 17 meshes with the first bevel gear 14 in the mounting cavity. The mounting block 15 is fixedly connected with a support block 18 at a position close to the second bevel gear 17. The support block 18 is provided with a ball groove, and the transmission shaft 16 is rotatably abutted against the balls in the ball groove. The outer end of the transmission shaft 16 is connected to a grinding wheel 19, the grinding wheel 19 is provided with a central cavity 20, the central cavity 20 is connected to a T-shaped liquid outlet channel 21, the outer end of the transmission shaft 16 is provided with an inner channel 22, the top end of the inner channel 22 is slidably sleeved with a lower buffer connecting pipe 23, and the bottom end of the inner channel 22 is connected to the central cavity 20 through a through hole; The No. 2 electric telescopic arm 5 is extended synchronously, and the clamping piece 6 clamps the long nut 24; the upper buffer connecting tube 9 and the lower buffer connecting tube 23 are on the same axis, the lower buffer connecting tube 23 is slid, and the upper buffer connecting tube 9 is rotated, and the upper buffer connecting tube 9 and the lower buffer connecting tube 23 rotate with the transmission shaft 16; the grinding coolant flows through the coolant inlet pipe 7, the coolant extension pipe 8, the upper buffer connecting tube 9, the lower buffer connecting tube 23, the inner channel 22, the central cavity 20, and finally sprays out from the T-shaped liquid outlet channel 21; the No. 1 electric telescopic arm 2 is extended, and the clamped long nut 24 gradually moves toward the grinding wheel 19, and the coolant inlet pipe 7 moves synchronously to wrap the coolant extension pipe 8.

[0024] Reference Figure 4 and Figure 7 In some embodiments of the present invention, the transmission shaft 16 is threadedly connected to the limit nut 25, one side of the grinding wheel 19 abuts against the limit nut 25, and the other side of the grinding wheel 19 abuts against the limit block 26 of the transmission shaft 16, and the limit nut 25 is provided with a through hole that matches the lower buffer connecting tube 23; the limit nut 25 can be screwed off to easily replace a new grinding wheel 19; the direction of rotation of the grinding wheel 19 is the direction in which the limit nut 25 tends to be tightened, that is, the limit nut 25 will not loosen during the rotation of the grinding wheel 19.

[0025] Reference Figure 3 and Figure 4 In some embodiments of the present invention, an air cooling channel 27 is provided at the right end of the installation cavity, that is, the propulsion shaft 12 is above the output shaft 13, and the air cooling channel 27 is connected to an external hose. A gas outlet 28 is provided at the bottom of the installation cavity near the second bevel gear 17, and a waterproof breathable membrane is installed at the gas outlet 28. The external hose transports cold air to the air cooling channel 27 through the pump body to cool down the transmission structure of the installation cavity, thereby preventing the transmission structure from overheating and causing a negative impact on the grinding process. The waterproof breathable membrane of the gas outlet 28 prevents splashing grinding coolant from entering the installation cavity.

[0026] Reference Figure 2 and Fig.10In some embodiments of the present invention, the outer wall of the positioning cylinder 3 is provided with a No. 1 slide rail, the outer connecting plate 4 includes a connecting ring and a branch plate, the branch plate improves the openness of the clamping long nut 24 area, and is convenient for heat dissipation. The connecting ring is provided with a No. 1 slider matched with the No. 1 slide rail, the No. 2 electric telescopic arm 5 is fixedly mounted on the branch plate, and the clamping piece 6 is provided with an extension block. The No. 1 slider slides to the end of the No. 1 slide rail, the No. 2 electric telescopic arm 5 is extended, and the extension block abuts against the end of the positioning cylinder 3; the outer connecting plate 4 is slid to the left end to facilitate the long nut 24 to enter the position between the positioning cylinder 3 and the grinding wheel 19, and then the outer connecting plate 4 is slid to the end of the No. 1 slider abutting against the end of the No. 1 slide rail, the No. 2 electric telescopic arm 5 is extended, and the clamping piece 6 clamps the long nut 24 while the extension block abuts against the end of the positioning cylinder 3 to prevent the long nut 24 from sliding to the left at will; the branch plate is provided with a accommodating cavity matched with the extension block, and when the No. 2 electric telescopic arm 5 is in a retracted state, the extension block is in the accommodating cavity.

[0027] Reference Fig. 9 In some embodiments of the present invention, an L-shaped groove 29 is provided on the inner wall of the upper buffer connecting tube 9, and a straight-shaped protrusion 30 is provided on the outer wall of the lower buffer connecting tube 23. The lower buffer connecting tube 23 is slid upward, and the straight-shaped protrusion 30 enters the first groove of the L-shaped groove 29. The upper buffer connecting tube 9 is rotated in the opposite direction of the rotation of the grinding wheel 19 until the straight-shaped protrusion 30 abuts against the end of the second groove of the L-shaped groove 29, thereby connecting the upper buffer connecting tube 9 and the lower buffer connecting tube 23. After that, when the grinding wheel 19 and the transmission shaft 16 rotate, the lower buffer connecting tube 23 drives the upper buffer connecting tube 9 to rotate, and the straight-shaped protrusion 30 will not be separated from the second groove of the L-shaped groove 29; a No. 1 indicator line is provided on the outer wall of the upper buffer connecting tube 9, and a No. 2 indicator line is provided on the outer wall of the lower buffer connecting tube 23. The straight-shaped protrusion 30 abuts against the end of the second groove of the L-shaped groove 29, and the No. 1 indicator line is aligned with the No. 2 indicator line, which is convenient for judging whether the upper buffer connecting tube 9 and the lower buffer connecting tube 23 are effectively connected.

[0028] Reference Figure 3 In some embodiments of the present invention, the positioning cylinder 3 is provided with a left support plate 31, the bottom end of the left support plate 31 is slidably connected to the workbench 1, and the positioning cylinder 3 is supported by the left support plate 31; the bottom end of the left support plate 31 is provided with a No. 2 slide rail, and the inner wall of the No. 2 slide rail is provided with a brush, and the brush is in contact with the No. 2 slider 32 of the workbench 1. During the movement of the left support plate 31, the brush brushes away the grinding coolant splashed on the No. 2 slider 32, so that the left support plate 31 can move smoothly along the No. 2 slider 32.

[0029] Reference Figure 4 and Figure 8In some embodiments of the present invention, the mounting block 15 is provided with protrusions evenly distributed along the circumference, and the propulsion shaft 12 is provided with concave holes matching with the protrusions. When welding the mounting block 15 and the propulsion shaft 12, first adjust the position of the teeth of the second bevel gear 17 relative to the first bevel gear 14, determine the basic position of the mounting block 15, and then make the protrusions enter the concave holes, and then perform ring welding.

[0030] Reference Fig.11 In some embodiments of the present invention, the right end of the coolant inlet pipe 7 is detachably connected to a cleaning rack 33 through a clamp structure, and a cleaning brush is installed on the inner wall of the cleaning rack 33, and the cleaning brush abuts against the outer wall of the coolant extension pipe 8. When the No. 1 electric telescopic arm 2 is extended, the cleaning brush moves to remove the grinding coolant splashed on the outer wall of the coolant extension pipe 8, thereby preventing the grinding coolant attached to the outer wall of the coolant extension pipe 8 from affecting the movement of the coolant inlet pipe 7.

[0031] The working steps of the present invention are: 1) Clamp and fix the long nut: Slide the outer connecting plate 4 and the coolant extension tube 8 to the left, so that the long nut 24 enters the space between the positioning tube 3 and the grinding wheel 19, slide the outer connecting plate 4 to the right to the rightmost end, and the four No. 2 electric telescopic arms 5 extend synchronously. While the clamping piece 6 clamps the long nut 24, the extension block abuts against the end of the positioning tube 3; 2) Connect the upper buffer connecting tube and the lower buffer connecting tube: slide the coolant extension tube 8 to the right, so that the coolant extension tube 8 passes through the long nut 24 and slides to the rightmost end. At this time, the upper buffer connecting tube 9 and the lower buffer connecting tube 23 are on the same axis, slide the lower buffer connecting tube 23 upward, rotate the upper buffer connecting tube 9, connect the upper buffer connecting tube 9 and the lower buffer connecting tube 23, and the upper buffer connecting tube 9 and the lower buffer connecting tube 23 can rotate with the transmission shaft 16; 3) Grinding operation: Start the grinding motor 11, the output shaft 13 drives the transmission shaft 16 to rotate through the meshing action of the No. 1 bevel gear 14 and the No. 2 bevel gear 17, the grinding wheel 19 rotates, the No. 1 electric telescopic arm 2 extends, the clamped long nut 24 gradually moves toward the rotating grinding wheel 19, and the coolant inlet pipe 7 moves synchronously to wrap the coolant extension pipe 8 until the grinding is completed.

[0032] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A grinding device for long nuts with large lead angles, comprising a workbench (1), characterized in that: A right support plate (10) and a grinding motor (11) are fixedly connected to the right side of the workbench (1), the right support plate (10) being provided with a propulsion shaft (12), an output shaft (13) of the grinding motor (11) rotatably passing through the propulsion shaft (12), a first bevel gear (14) being installed at the end of the output shaft (13), a mounting block (15) being welded at one end of the propulsion shaft (12) close to the first bevel gear (14) to form a mounting cavity, a transmission shaft (16) being rotatably sleeved on the mounting block (15), a second bevel gear (17) being installed on the transmission shaft (16), the second bevel gear (17) meshing with the first bevel gear (14) in the mounting cavity The mounting block (15) is fixedly connected to a support block (18) at a position close to the second bevel gear (17); the support block (18) is provided with a ball groove; the transmission shaft (16) is rotatably abutted against the ball in the ball groove; the outer end of the transmission shaft (16) is connected to a grinding wheel (19); the grinding wheel (19) is provided with a central cavity (20); the central cavity (20) is connected to a T-shaped liquid outlet channel (21); the outer end of the transmission shaft (16) is provided with an inner channel (22); the top end of the inner channel (22) is slidably sleeved with a lower buffer connecting pipe (23); the bottom end of the inner channel (22) is connected to the central cavity (20) through a through hole.

2. The grinding device for long nuts with large lead angles as claimed in claim 1, characterized in that: The left end of the workbench (1) is connected to a positioning cylinder (3) via a No. 1 electric telescopic arm (2), the positioning cylinder (3) is slidably connected to an external connection plate (4), the external connection plate (4) is mounted with a No. 2 electric telescopic arm (5) which is evenly distributed, the end of the No. 2 electric telescopic arm (5) is fixedly connected to a clamping plate (6), the positioning cylinder (3) is penetrated by a coolant inlet pipe (7), the coolant inlet pipe (7) is slidably sleeved with a coolant extension pipe (8), the end of the coolant extension pipe (8) is provided with a lower inclined pipe, and the lower inclined pipe is rotatably sleeved with an upper buffer connection pipe (9); The second electric telescopic arm (5) is extended synchronously, and the clamping piece (6) clamps the long nut (24); the upper buffer connecting tube (9) and the lower buffer connecting tube (23) are on the same axis, the lower buffer connecting tube (23) is slid upward, and the upper buffer connecting tube (9) is rotated, and the upper buffer connecting tube (9) and the lower buffer connecting tube (23) rotate along with the transmission shaft (16); the first electric telescopic arm (2) is extended, and the clamped long nut (24) gradually moves toward the grinding wheel (19), and the coolant inlet pipe (7) moves synchronously to wrap the coolant extension pipe (8); The transmission shaft (16) is threadedly connected to a limit nut (25), one side of the grinding wheel (19) abuts against the limit nut (25), and the other side of the grinding wheel (19) abuts against a limit block (26) of the transmission shaft (16), and the limit nut (25) is provided with a through hole matched with the lower buffer connecting pipe (23).

3. The grinding device for long nuts with large lead angles as claimed in claim 1, characterized in that: An air cooling channel (27) is provided at the right end of the installation cavity, and an external hose is connected to the air cooling channel (27). A gas outlet (28) is provided at the bottom end of the installation cavity near the second bevel gear (17), and a waterproof breathable membrane is installed at the gas outlet (28).

4. The grinding device for long nuts with large lead angles as claimed in claim 2, characterized in that: The outer wall of the positioning cylinder (3) is provided with a No. 1 slide rail, the outer connecting plate (4) comprises a connecting ring and a branch plate, the connecting ring is provided with a No. 1 slider matched with the No. 1 slide rail, the No. 2 electric telescopic arm (5) is fixedly mounted on the branch plate, the clamping plate (6) is provided with an extension block, the branch plate is provided with a receiving cavity matched with the extension block, the No. 1 slider slides to the end of the No. 1 slide rail, the No. 2 electric telescopic arm (5) is extended, and the extension block abuts against the end of the positioning cylinder (3).

5. The grinding device for long nuts with large lead angles as claimed in claim 2, characterized in that: The inner wall of the upper buffer connecting tube (9) is provided with an L-shaped groove (29), and the outer wall of the lower buffer connecting tube (23) is provided with a straight-shaped protrusion (30). The lower buffer connecting tube (23) is slid upward, and the straight-shaped protrusion (30) enters the first groove of the L-shaped groove (29). The upper buffer connecting tube (9) is rotated in the opposite direction of the rotation of the grinding wheel (19) until the straight-shaped protrusion (30) abuts against the end of the second groove of the L-shaped groove (29).

6. The grinding device for long nuts with large lead angles as claimed in claim 5, characterized in that: The outer wall of the upper buffer connecting tube (9) is provided with a first indicator line, the outer wall of the lower buffer connecting tube (23) is provided with a second indicator line, the I-shaped protrusion (30) abuts against the end of the second groove of the L-shaped groove (29), and the first indicator line is aligned with the second indicator line.

7. The grinding device for long nuts with large lead angles as claimed in claim 1, characterized in that: The positioning cylinder (3) is provided with a left supporting plate (31), and the bottom end of the left supporting plate (31) is slidably connected to the workbench (1).

8. The grinding device for long nuts with large lead angles as claimed in claim 7, characterized in that: A second slide rail is provided at the bottom end of the left support plate (31), and a brush is provided on the inner wall of the second slide rail. The brush is in movable contact with a second slide block (32) of the workbench (1).

9. The grinding device for long nuts with large lead angles as claimed in claim 1, characterized in that: The mounting block (15) is provided with protrusions evenly distributed along the circumference, and the propulsion shaft (12) is provided with concave holes matching with the protrusions.

10. The grinding device for long nuts with large lead angles as claimed in claim 1, characterized in that: The right end of the coolant inlet pipe (7) is detachably connected to a cleaning frame (33), and a cleaning brush is mounted on the inner wall of the cleaning frame (33), and the cleaning brush abuts against the outer wall of the coolant extension pipe (8).

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