Fully automatic grinding and polishing equipment for round bar fatigue specimens

Abstract

The present invention belongs to the technical field of metal material processing equipment, and specifically discloses a fully automatic grinding and polishing equipment for round bar fatigue specimens. It is used to solve the problem that the existing single-bar grinding and polishing method occupies a lot of equipment and has low grinding and polishing efficiency. It includes a base, a grinding and polishing area bracket and a motor bracket. A first support column is fixed on the grinding and polishing area bracket. The first support column is sequentially sleeved with an upper top assembly, a grinding and polishing roller assembly and a lower top assembly from top to bottom. The lower top assembly and the upper top assembly are arranged relatively to each other, and the two clamp the round bar fatigue specimen and drive it to rotate. A circumferential gear transmission mechanism is also provided on the base, and a main drive motor and a centralized control box are provided on the motor bracket. The main drive motor is connected to an adjustable cam transmission rod, and the adjustable cam transmission rod is connected to the grinding and polishing roller assembly. The main drive motor and the circumferential gear transmission mechanism are both electrically connected to the centralized control box. The present invention improves the grinding and polishing efficiency of round bar fatigue specimens while meeting the grinding and polishing requirements of domestic and foreign standards.

Description

Technical Field

[0001] The invention belongs to the technical field of metal material processing equipment, and in particular relates to a full-automatic grinding and polishing equipment for round bar fatigue specimens. Background Art

[0002] Various domestic and international standards on fatigue testing have extremely high requirements for the preparation process of fatigue specimens. Take clause 6.2 of the standard GB / T 26077-2010 "Axial Strain Control Method for Fatigue Test of Metallic Materials" as an example: "Polishing: When the size difference from the finished product is 0.025mm, use sandpaper with gradually decreasing particle size to complete the polishing. It is recommended to adopt longitudinal polishing in the final stage." The purpose of longitudinal polishing is to remove the radial lines on the surface of the round bar processed by lathe and convert the radial lines into axial lines.

[0003] At present, most domestic laboratories use single-bar grinding and polishing for the final grinding and polishing process of round bar fatigue. The grinding and polishing process of each fatigue specimen needs to go through three steps from rough polishing to fine polishing. For example, the Chinese invention patent with publication number CN114833646A discloses a grinding and polishing device and processing equipment for rods. The grinding and polishing device for rods includes a transmission box, a transmission gear, a driving member, multiple grinding heads, multiple transmission members and multiple connecting rods. The transmission members and connecting rods work together to drive all grinding heads to contact the rods. In order to improve the grinding efficiency, grinding accuracy and surface finish of the rods, and to achieve reciprocating grinding and polishing of the workpiece surface, multiple processing equipment are divided into rough grinding area, medium grinding area and fine grinding area according to processing requirements. This single-bar grinding and polishing method occupies a lot of equipment and has low grinding and polishing efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a fully automatic grinding and polishing device for round bar fatigue specimens, which effectively solves the problem that the existing single-bar grinding and polishing method occupies more equipment and has low grinding and polishing efficiency.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a fully automatic grinding and polishing equipment for round rod fatigue specimens, including a base, a grinding and polishing area bracket and a motor bracket, the grinding and polishing area bracket and the motor bracket are both fixedly connected to the base, a first support column is fixed on the grinding and polishing area bracket, and the first support column is sequentially provided with an upper center assembly, a grinding and polishing roller assembly for grinding and polishing round rod fatigue specimens and a lower center assembly from top to bottom.

[0006] The lower top assembly and the upper top assembly are arranged opposite to each other, and both include a fixed disc and an even number of top units. The even number of top units are evenly arranged along the outer side surface of the fixed disc. The top unit of the lower top assembly and the top unit of the corresponding upper top assembly are respectively inserted into the two ends of the round rod fatigue specimen for clamping and driving the round rod fatigue specimen to rotate.

[0007] The base is also provided with a circumferential gear transmission mechanism for driving the top unit of the lower top assembly to rotate. The motor bracket is provided with a main transmission motor and a centralized control box. The output shaft of the main transmission motor is connected to an adjustable cam transmission rod for adjusting the longitudinal grinding and polishing stroke. The free end of the adjustable cam transmission rod is connected to the grinding and polishing roller assembly. The main transmission motor and the circumferential gear transmission mechanism are both electrically connected to the centralized control box.

[0008] Furthermore, the fixed disc and each top unit are fixedly connected via a first fixed rod, a first spring and a first shaft sleeve are sleeved on the first fixed rod, and the first spring is located between the first shaft sleeve and the fixed disc.

[0009] The top unit includes a conical top, a main shaft fixedly connected to the bottom end of the conical top, and a second sleeve sleeved on the main shaft. The main shaft and the second sleeve are connected by a bearing. The tip of the conical top of the lower top assembly faces upward, and the tip of the conical top of the upper top assembly faces downward. The conical top of the lower top assembly and the corresponding conical top of the upper top assembly are respectively inserted into the two ends of the round rod fatigue specimen.

[0010] The outer side surface of the second sleeve of the lower top assembly is vertically connected to the outer side surface of the first sleeve of the lower top assembly, the free end of the main shaft of the upper top assembly is connected to the second fixing rod, the top end of the second fixing rod is connected to a fixing bolt for fixing the Z-axis displacement of the top unit of the upper top assembly, the second fixing rod is sleeved with a third sleeve and a second spring, the second spring is located between the third sleeve and the upper top assembly, the outer side surface of the third sleeve is vertically connected to the outer side surface of the first sleeve of the upper top assembly.

[0011] Furthermore, the circumferential gear transmission mechanism includes a driving wheel, a driven wheel, a belt motor and a disc base for adjusting the contact position of the round rod fatigue specimen and the grinding and polishing roller assembly. The belt motor is electrically connected to the control box, and the output shaft of the belt motor is connected to the driving wheel. The driving wheel and the driven wheel are connected by a belt. The driven wheel is arranged on the disc base, and the inner side surface of the driven wheel is serrated. The free end of the main shaft of the top unit of the lower top assembly is fixedly connected to a gear, and the gear is meshed with the inner side surface of the driven wheel.

[0012] Furthermore, an arc-shaped limiting groove is provided on the base, a connecting rod is connected to the outer side of the disc base, a limiting bolt is provided at the free end of the connecting rod, the free end of the limiting bolt is inserted into the arc-shaped limiting groove, and the connecting rod is fixedly connected to the arc-shaped limiting groove by a fastening nut on the limiting bolt.

[0013] Furthermore, the grinding and polishing roller assembly includes a roller support frame and a fixing clamp for clamping and fixing the roller support frame, the roller support frame and the fixing clamp are both in a double-layer structure, the roller support frame is circular, and the fixing clamp is in a clamp shape with an open front end and left-right symmetry.

[0014] The roller support frame is evenly provided with a plurality of fan-shaped through holes, and the fan-shaped through holes are arranged opposite to the top units one by one. A sanding belt roller for supporting the sanding belt is fixed in the fan-shaped through holes, and a sanding belt baffle for fixing the sanding belt path is fixed at the upper and lower ends of the sanding belt roller. The outer edge of the roller support frame and the outer edge of the fixing clamp are evenly provided with a plurality of nylon rollers for guiding the sanding belt, and at least one nylon roller is provided on the roller support frame located between adjacent sanding belt rollers.

[0015] A sanding belt box for containing the sanding belt is fixed on each of the left and right sides of the rear end interlayer of the fixing clamp, a sanding belt transmission motor and a first rubber wheel are provided on each of the left and right sides of the rear end of the fixing clamp, the output shaft of the sanding belt transmission motor is connected to the second rubber wheel, the side surface of the first rubber wheel is connected to the side surface of the second rubber wheel, and the sanding belt transmission motor is electrically connected to the centralized control box.

[0016] The abrasive belt in the abrasive belt box is guided by the nylon roller on the roller support frame and then passed through each abrasive belt roller in sequence. After the abrasive belt passes around the last abrasive belt roller, it is guided by the nylon roller on the fixing clamp to between the first rubber wheel and the second rubber wheel, thereby squeezing the abrasive belt for transmission.

[0017] Furthermore, a connecting plate is provided at the middle position of the upper surface and the lower surface of the outer side of the fan-shaped through hole, and the connecting plate is provided with an adjustment hole for fixing and adjusting the front and rear position of the sanding belt roller, and the sanding belt roller is connected to the connecting plate by bolts in the adjustment holes.

[0018] Furthermore, the first support column passes through the center of the fixed disc of the upper top assembly, the center of the roller support frame and the center of the fixed disc of the lower top assembly from top to bottom in sequence, and a second support column is also fixed on the grinding and polishing area bracket, and the free end of the second support column passes through the fixing clamp and is fixedly connected to the upper surface of the base.

[0019] Furthermore, the adjustable cam transmission rod includes a rotating cam, a main transmission rod and a secondary transmission rod, the rear side of the rotating cam is provided with a first adjusting bolt for adjusting the length of the rotating cam, and the rear side surface of the fixing clamp is provided with a second adjusting bolt for adjusting the length of the main transmission rod located above the fixing clamp.

[0020] The lower end of the rotating cam is connected to the upper end of the auxiliary transmission rod, the lower end of the auxiliary transmission rod is connected to the upper end of the main transmission rod, and the lower end of the main transmission rod passes through the fixing clamp and is fixedly connected to the fixing clamp by a first adjusting bolt.

[0021] Furthermore, the auxiliary transmission rod includes an adjusting rod, an upper nut and a lower nut, the upper and lower parts of the adjusting rod are both provided with external threads, the upper nut and the lower nut are both provided with internal threads, the upper nut and the lower nut are respectively threadedly connected to the upper and lower parts of the adjusting rod, and the length of the auxiliary transmission rod is adjusted by different connection positions of the upper nut and the lower nut with the adjusting rod.

[0022] Furthermore, the roller support frame is evenly divided into two left and right parts along the radial direction, wherein the sanding belt box located on the left side provides the sanding belt for the sanding belt roller in the left half of the roller support frame, and the sanding belt in the left half of the roller support frame is transmitted by the sanding belt transmission motor located on the left side; the sanding belt box located on the right side provides the sanding belt for the sanding belt roller in the right half of the roller support frame, and the sanding belt in the right half of the roller support frame is transmitted by the sanding belt transmission motor located on the right side.

[0023] Compared with the prior art, the beneficial technical effect of the present invention is that the fully automatic grinding and polishing equipment provided by the present invention fixes multiple round bar fatigue specimens through multiple upper and lower top units, and then drives the grinding and polishing roller assembly through the motor and the transmission mechanism to uniformly longitudinally polish all round bar fatigue specimens at the same time, effectively solving the problem that the existing single-bar grinding and polishing method occupies more equipment and has low grinding and polishing efficiency. The present invention improves the grinding and polishing efficiency of the current round bar fatigue specimens, and at the same time meets the requirements of domestic and foreign standards such as HB 5287, ASTME466, GB / T3075 for rod fatigue grinding and polishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure from the first perspective of the fully automatic grinding and polishing equipment for round bar fatigue specimens provided in Example 1.

[0025] Figure 2 yes Figure 1 Schematic diagram of the connection structure between the middle and lower center components and the driven wheel.

[0026] Figure 3 yes Figure 1 Schematic diagram of the structure of the top and middle components.

[0027] Figure 4 It is a schematic diagram of the exploded structure of the top unit of the lower top assembly.

[0028] Figure 5 It is a schematic diagram of the top view of the grinding and polishing roller assembly.

[0029] Figure 6 It is a schematic diagram of the connection structure of the sand belt transmission motor, the first rubber wheel and the second rubber wheel.

[0030] Figure 7It is a schematic diagram of the three-dimensional structure from a second perspective of the fully automatic grinding and polishing equipment for round bar fatigue specimens provided in Example 1.

[0031] Figure 8 It is a schematic diagram of the connection structure of the adjustable cam transmission rod.

[0032] Description of reference numerals: base 1; grinding and polishing area bracket 2; motor bracket 3; first support column 4; upper center assembly 5; round bar fatigue specimen 6; grinding and polishing roller assembly 7; lower center assembly 8; fixed disc 9; first spring 10; first sleeve 11; conical center 12; spindle 13; second sleeve 14; bearing 15; fixing bolt 16; third sleeve 17; second spring 18; driving wheel 19; driven wheel 20; belt motor 21; disc base 22; belt 23; gear 24; arc limit groove 25; connecting rod 26; limit bolt-27; roller support frame-28; fixing clamp-29; arc-shaped gripping clamp-30; fan-shaped through hole-31; sanding belt-32; sanding belt roller-33; sanding belt baffle-34; connecting plate-35; adjustment hole-36; nylon roller-37; sanding belt box-38; fixing pin-39; sanding belt transmission motor-40; first rubber wheel-41; second rubber wheel-42; main transmission motor-43; centralized control box-44; rotating cam-45; main transmission rod-46; auxiliary transmission rod-47; first adjusting bolt-48; second adjusting bolt-49; second support column-50. DETAILED DESCRIPTION

[0033] Example 1: A fully automatic grinding and polishing device for round bar fatigue specimen 6, such as Figure 1 and Figure 7 As shown, it includes a square base 1, a door frame-shaped grinding and polishing area bracket 2 and an inverted V-shaped motor bracket 3. The grinding and polishing area bracket 2 and the motor bracket 3 are both fixedly connected to the base 1, and the grinding and polishing area bracket 2 is located in the middle of the base 1, and the motor bracket 3 is located at the rear end of the base 1.

[0034] A first support column 4 is fixed on the grinding and polishing area bracket 2, and an upper center assembly 5, a grinding and polishing roller assembly 7 for grinding and polishing a round rod fatigue specimen 6, and a lower center assembly 8 are sequentially sleeved on the first support column 4 from top to bottom.

[0035] like Figure 1 , Figure 2 and Figure 3 As shown, the lower top assembly 8 and the upper top assembly 5 are arranged opposite to each other, and both include a fixed disc 9 and six top units, and the six top units are evenly arranged along the outer side of the fixed disc 9. The fixed disc 9 is fixedly connected to each top unit through a first fixing rod, and a first spring 10 and a first sleeve 11 are sleeved on the first fixing rod, and the first spring 10 is located between the first sleeve 11 and the fixed disc 9.

[0036] The top unit includes a conical top 12, a main shaft 13 fixedly connected to the bottom end of the conical top 12, and a second sleeve 14 sleeved on the main shaft 13. The main shaft 13 and the second sleeve 14 are connected by a bearing 15. The tip of the conical top 12 of the lower top assembly 8 faces upward, and the tip of the conical top 12 of the upper top assembly 5 faces downward. The conical top 12 of the lower top assembly 8 and the corresponding conical top 12 of the upper top assembly 5 are respectively inserted into the two ends of the round rod fatigue specimen 6 to clamp and drive the round rod fatigue specimen 6 to rotate. In this embodiment, as Figure 4 As shown, two bearings 15 are provided between the main shaft 13 and the second sleeve 14 of the lower top assembly 8, and the two bearings 15 are respectively located at the upper part and the lower part of the second sleeve 14. By providing the bearings 15 between the main shaft 13 and the second sleeve 14, it is beneficial to ensure the stable rotation of the conical top 12.

[0037] like Figure 2 and Figure 3 As shown, the outer side surface of the second sleeve 14 of the lower top assembly 8 is vertically connected to the outer side surface of the first sleeve 11 of the lower top assembly 8; the free end of the main shaft 13 of the upper top assembly 5 is connected to the second fixing rod, and the top end of the second fixing rod is connected to a fixing bolt 16 for fixing the Z-axis displacement of the top unit of the upper top assembly 5. The second fixing rod is also sleeved with a third sleeve 17 and a second spring 18, and the second spring 18 is located between the third sleeve 17 and the second sleeve 14 of the upper top assembly 5. The outer side surface of the third sleeve 17 is vertically connected to the outer side surface of the first sleeve 11 of the upper top assembly 5. By sleeved with the second spring 18 on the second fixing rod, pressure buffering is facilitated.

[0038] In this embodiment, the second sleeve 14 and the first sleeve 11 of the lower top assembly 8 and the third sleeve 17 and the first sleeve 11 of the upper top assembly 5 are integrally cast. Since the diameter of the upper end of the grinding and polishing area of ​​the round bar fatigue specimen 6 gradually increases upward, and the diameter of the lower end of the grinding and polishing area of ​​the round bar fatigue specimen 6 gradually increases downward, therefore, in this embodiment, by arranging the first spring 10 on the first fixing rod, it is beneficial to buffer the change in contact pressure between the abrasive belt roller 33 and the round bar fatigue specimen 6 caused by the change in diameter of the grinding and polishing area of ​​the round bar fatigue specimen 6 during the longitudinal grinding and polishing stroke.

[0039] like Figure 1As shown, the base 1 is also provided with a circumferential gear transmission mechanism for driving the conical top 12 of the lower top assembly 8 to rotate, and the circumferential gear transmission mechanism includes a driving wheel 19, a driven wheel 20, a belt motor 21, and a disc base 22 for adjusting the contact position between the round bar fatigue specimen 6 and the grinding and polishing roller assembly 7. The output shaft of the belt motor 21 is connected to the driving wheel 19, and the driving wheel 19 and the driven wheel 20 are connected by a belt 23. The driven wheel 20 is arranged on the disc base 22, and the inner side surface of the driven wheel 20 is serrated; the free end of the main shaft 13 of the top unit of the lower top assembly 8 is fixedly connected with a gear 24, and the gear 24 is meshed with the inner side surface of the driven wheel 20. The belt motor 21 drives the driving wheel 19 and the driven wheel 20 to rotate, thereby driving the gear 24 and the main shaft 13 of the lower top assembly 8 to rotate synchronously, and then the main shaft 13 of the lower top assembly 8 drives the round bar fatigue specimen 6 to rotate.

[0040] In this embodiment, an arc-shaped limiting groove 25 is provided on the left side of the front end of the base 1, and a connecting rod 26 is connected to the outer side of the disc base 22. A limiting bolt 27 is provided at the free end of the connecting rod 26, and the free end of the limiting bolt 27 is inserted into the arc-shaped limiting groove 25. The connecting rod 26 is fixedly connected to the arc-shaped limiting groove 25 by the fastening nut on the limiting bolt 27. Thus, the disc base 22 is rotated along the arc-shaped limiting groove 25 according to the diameter of the round rod fatigue specimen 6, and then the disc base 22 drives the round rod fatigue specimen 6 on the lower top assembly 8 to adjust its position in the fan-shaped through hole 31, and finally the pressure exerted on the surface of the round rod fatigue specimen 6 by the abrasive belt roller 33 is adjusted by rotation.

[0041] like Figure 5 As shown, the grinding and polishing roller assembly 7 includes a roller support frame 28 and a fixing clamp 29 for clamping and fixing the roller support frame 28. The roller support frame 28 and the fixing clamp 29 are both in a double-layer structure, and the roller support frame 28 is circular, and the fixing clamp 29 is in a pliers shape with an open front end and symmetrical left and right. In this embodiment, the fixing clamp 29 embraces the roller support frame 28, and the roller support frame 28 can be divided into a left half and a right half along the symmetry axis direction of the fixing clamp 29. Two arc-shaped gripping clamps 30 of the pliers-shaped fixing clamp 29 are respectively connected to the outer edges of the left half and the right half of the roller support frame 28, and the outer edge of the roller support frame 28 is spaced a certain distance from the outer edge of the fixing clamp 29.

[0042] In this embodiment, six fan-shaped through holes 31 are evenly arranged on the roller support frame 28, and the fan-shaped through holes 31 are arranged one by one opposite to the top units. A sanding belt roller 33 for supporting the sanding belt 32 is fixed in each fan-shaped through hole 31, and a circular sanding belt baffle 34 for fixing the path of the sanding belt 32 is fixed at both the upper and lower ends of the sanding belt roller 33. In order to prevent the sanding belt baffle 34 from interfering with the sanding belt 32 grinding and polishing the round bar fatigue specimen 6, the sanding belt baffle 34 in the area of ​​the sanding belt 32 in contact with the round bar fatigue specimen 6 is flattened along the tangent direction of the sanding belt roller 33 at this location. In this embodiment, a tongue-shaped connecting plate 35 is respectively provided at the middle position of the upper surface and the lower surface of the outer side of the fan-shaped through hole 31, and the connecting plate 35 is provided with an adjustment hole 36 for fixing and adjusting the front and rear position of the sanding belt roller 33, and the sanding belt roller 33 is bolted to the connecting plate 35 through the adjustment hole 36.

[0043] The outer edges of the roller support frame 28 and the fixed clamp 29 are evenly provided with a plurality of nylon rollers 37 for guiding the abrasive belt 32, and at least one nylon roller 37 is provided on the roller support frame 28 between adjacent abrasive belt rollers 33. In this embodiment, two nylon rollers 37 are provided on the outer side of each fan-shaped through hole 31, which are located on the left and right sides of the corresponding abrasive belt roller 33. The nylon rollers 37 on the fixed clamp 29 are concentrated at the two arc-shaped gripping clips 30 of the fixed clamp 29, and four nylon rollers 37 are evenly distributed on each arc-shaped gripping clip 30, and one of the nylon rollers 37 is located at the free end of the arc-shaped gripping clip 30.

[0044] A belt box 38 for containing the abrasive belt 32 is fixed on each of the left and right sides of the rear end interlayer of the fixing clamp 29. The abrasive belt roll in the belt box 38 is fixed by a fixing pin 39, so that the abrasive belt roll can be easily replaced. In this embodiment, the two belt boxes 38 are symmetrically distributed with respect to the symmetry axis of the fixing clamp 29.

[0045] like Figure 5 and Figure 6 As shown, a belt drive motor 40 and a first rubber wheel 41 are respectively provided on the left and right sides of the rear end of the fixing clamp 29, and the output shaft of the belt drive motor 40 is connected to the second rubber wheel 42, and the side of the first rubber wheel 41 is connected to the side of the second rubber wheel 42. The sanding belt 32 in the sanding belt box 38 is guided by the nylon roller 37 on the roller support frame 28 and then sequentially wound around each sanding belt roller 33. After the sanding belt 32 passes around the last sanding belt roller 33, the sanding belt 32 is guided by the nylon roller 37 on the fixing clamp 29 to between the first rubber wheel 41 and the second rubber wheel 42, so as to squeeze the sanding belt 32 for transmission. In this embodiment, the used sanding belt 32 is collected by the waste sanding belt box.

[0046] In this embodiment, the sanding belt box 38 located on the left side provides sanding belts 32 for the three sanding belt rollers 33 on the left half of the roller support frame 28, and transmits the sanding belts 32 on the left half of the roller support frame 28 through the sanding belt transmission motor 40 located on the left side; the sanding belt box 38 located on the right side provides sanding belts 32 for the three sanding belt rollers 33 on the right half of the roller support frame 28, and transmits the sanding belts 32 on the right half of the roller support frame 28 through the sanding belt transmission motor 40 located on the right side.

[0047] like Figure 7 As shown, the motor bracket 3 is provided with a main drive motor 43 and a centralized control box 44. In this embodiment, the main drive motor 43 is located at the upper part of the motor bracket 3; the centralized control box 44 integrates a time relay for timing. The output shaft of the main drive motor 43 is connected to an adjustable cam transmission rod for adjusting the longitudinal grinding and polishing stroke, and the free end of the adjustable cam transmission rod is connected to the grinding and polishing roller assembly 7. The main drive motor 43, the belt motor 21 and the sanding belt drive motor 40 are all electrically connected to the centralized control box 44.

[0048] In this embodiment, the time it takes for the belt motor 21 to drive the gear 24 to rotate one circle is 2.1 minutes. The time setting knob on the control box 44 is rotated and set to a multiple of 2.1, and the start button is pressed. At this time, the main drive motor 43 drives the grinding and polishing roller assembly 7 to move back and forth up and down through the adjustable cam drive rod. The six sanding belt rollers 33 together with the sanding belt 32 act on the surface of the six round rod fatigue specimens 6 for reciprocating longitudinal polishing. The round rod fatigue specimen 6 rotates one circle every 2.1 minutes. At the same time, the sanding belt drive motor 40 will slowly pull out the old sanding belt 32 after grinding and polishing, and discharge it into the waste sanding belt box.

[0049] In this embodiment, if Figure 8 As shown, the adjustable cam transmission rod includes a rotating cam 45, a main transmission rod 46 and a secondary transmission rod 47. A first adjusting bolt 48 for adjusting the length of the rotating cam 45 is provided on the rear side of the rotating cam 45, and a second adjusting bolt 49 for adjusting the length of the main transmission rod 46 located above the fixing clamp 29 is provided on the rear side of the fixing clamp 29. The lower end of the rotating cam 45 is connected to the upper end of the secondary transmission rod 47, and the lower end of the secondary transmission rod 47 is connected to the upper end of the main transmission rod 46. The lower end of the main transmission rod 46 passes through the fixing clamp 29 and is fixedly connected to the fixing clamp 29 by the first adjusting bolt 48.

[0050] In this embodiment, the auxiliary transmission rod 47 includes an adjusting rod, an upper nut and a lower nut. The upper and lower parts of the adjusting rod are provided with external threads, and the upper nut and the lower nut are provided with internal threads. The upper nut and the lower nut are respectively connected to the upper and lower threads of the adjusting rod. The length of the auxiliary transmission rod 47 is adjusted by adjusting the connection positions of the upper nut and the lower nut with the adjusting rod.

[0051] In this embodiment, the first support column 4 passes through the center of the fixed disc 9 of the upper top assembly 5, the center of the roller support frame 28 and the center of the fixed disc 9 of the lower top assembly 8 from top to bottom. In order to further improve the stability of the grinding and polishing roller assembly 7, a second support column 50 is also fixed on the grinding and polishing area bracket 2, and the free end of the second support column 50 passes through the fixing clamp 29 and is fixedly connected to the upper surface of the base 1.

[0052] The working principle of this embodiment is as follows: first, lower the grinding and polishing roller assembly 7, lift the upper top assembly 5, and align the round bar fatigue specimen 6 with double top holes with the conical top 12 of the lower top assembly 8, then lower the upper top assembly 5, apply a portion of downward pressure according to the size of the round bar fatigue specimen 6, and then tighten the fixing bolt 16. Adjust the disc base 22 according to the diameter of the round bar fatigue specimen 6, and then rotate and adjust the pressure applied by the abrasive belt roller 33 on the surface of the round bar fatigue specimen 6. When the appropriate pressure is adjusted, the sample loading process is completed.

[0053] The upper and lower positions of the rotating cam 45 , the auxiliary transmission rod 47 and the main transmission rod 46 are manually adjusted to determine the grinding and polishing stroke of the round bar fatigue specimen 6 .

[0054] Through calculation, it takes 2.1 minutes for the belt motor 21 to drive the gear 24 to rotate one circle. The time setting knob on the control box 44 is rotated and set to a multiple of 2.1. The start button is pressed. At this time, the main drive motor 43 drives the grinding and polishing roller assembly 7 to move up and down reciprocatingly through the adjustable cam drive rod. The six sanding belt rollers 33 together with the sanding belt 32 act on the surface of the six round rod fatigue specimens 6 for reciprocating longitudinal polishing. The round rod fatigue specimen 6 rotates one circle every 2.1 minutes. At the same time, the sanding belt drive motor 40 will slowly pull out the old sanding belt 32 after grinding and polishing and discharge it into the waste sanding belt box.

[0055] When the time set on the central control box 44 is reached, the work is stopped. At this time, the grinding and polishing process is completed. Turn the disc base 22 to separate the abrasive belt roller 33 from the round bar fatigue specimen 6, and then lift the top center assembly 5. At this time, it is necessary to lock the fixing bolts 16 to leave enough space to remove the round bar fatigue specimen 6. Pull out the two fixing pins 39 that fix the abrasive belt roll on the fixing clamp 29, take out the abrasive belt roll, replace the abrasive belt roll required for the next process, and continue grinding and polishing.

[0056] This embodiment improves the grinding and polishing efficiency of the current round rod fatigue specimen 6, and at the same time meets the requirements of domestic and foreign standards such as HB 5287, ASTM E466, GB / T3075 for rod fatigue grinding and polishing; it effectively solves the problem of the existing single-rod grinding and polishing method occupying more equipment and having low grinding and polishing efficiency.

[0057] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A fully automatic grinding and polishing device for round bar fatigue specimens, comprising a base (1), a grinding and polishing area bracket (2) and a motor bracket (3), wherein the grinding and polishing area bracket (2) and the motor bracket (3) are both fixedly connected to the base (1), characterized in that: A first support column (4) is fixed on the grinding and polishing area bracket (2), and an upper center assembly (5), a grinding and polishing roller assembly (7) for grinding and polishing a round rod fatigue specimen (6), and a lower center assembly (8) are sequentially sleeved on the first support column (4) from top to bottom; The lower top assembly (8) and the upper top assembly (5) are arranged opposite to each other, and both include a fixed disc (9) and an even number of top units, the even number of top units being evenly arranged along the outer side surface of the fixed disc (9), the top units of the lower top assembly (8) and the top units of the corresponding upper top assembly (5) being respectively inserted into two ends of the round rod fatigue specimen (6) for clamping and driving the round rod fatigue specimen (6) to rotate; The base (1) is also provided with a circumferential gear transmission mechanism for driving the top unit of the lower top assembly (8) to rotate. The motor bracket (3) is provided with a main transmission motor (43) and a centralized control box (44). The output shaft of the main transmission motor (43) is connected to an adjustable cam transmission rod for adjusting the longitudinal grinding and polishing stroke. The free end of the adjustable cam transmission rod is connected to the grinding and polishing roller assembly (7). The main transmission motor (43) and the circumferential gear transmission mechanism are both electrically connected to the centralized control box (44).

2. The fully automatic grinding and polishing equipment for round bar fatigue specimens according to claim 1 is characterized in that: The fixed disc (9) and each top unit are fixedly connected via a first fixed rod, the first fixed rod is sleeved with a first spring (10) and a first shaft sleeve (11), and the first spring (10) is located between the first shaft sleeve (11) and the fixed disc (9); The tip unit comprises a conical tip (12), a main shaft (13) fixedly connected to the bottom end of the conical tip (12), and a second shaft sleeve (14) sleeved on the main shaft (13); the main shaft (13) and the second shaft sleeve (14) are connected via a bearing (15); the tip of the conical tip (12) of the lower tip assembly (8) faces upward, and the tip of the conical tip (12) of the upper tip assembly (5) faces downward; the conical tip (12) of the lower tip assembly (8) and the conical tip (12) of the corresponding upper tip assembly (5) are respectively inserted into two ends of a round rod fatigue specimen (6); The outer side surface of the second shaft sleeve (14) of the lower top assembly (8) is vertically connected to the outer side surface of the first shaft sleeve (11) of the lower top assembly (8); the free end of the main shaft (13) of the upper top assembly (5) is connected to a second fixing rod; the top end of the second fixing rod is connected to a fixing bolt (16) for fixing the Z-axis displacement of the top unit of the upper top assembly (5); a third shaft sleeve (17) and a second spring (18) are sleeved on the second fixing rod; the second spring (18) is located between the third shaft sleeve (17) and the upper top assembly (5); the outer side surface of the third shaft sleeve (17) is vertically connected to the outer side surface of the first shaft sleeve (11) of the upper top assembly (5).

3. The fully automatic grinding and polishing equipment for round bar fatigue specimens according to claim 2 is characterized in that: The circumferential gear transmission mechanism comprises a driving wheel (19), a driven wheel (20), a belt motor (21) and a disc base (22) for adjusting the contact position between the round rod fatigue specimen (6) and the grinding and polishing roller assembly (7); the belt motor (21) is electrically connected to a centralized control box (44); the output shaft of the belt motor (21) is connected to the driving wheel (19); the driving wheel (19) and the driven wheel (20) are connected via a belt (23); the driven wheel (20) is arranged on the disc base (22); the inner side surface of the driven wheel (20) is serrated; a gear (24) is fixedly connected to the free end of the main shaft (13) of the top unit of the lower top assembly (8); the gear (24) is meshingly connected to the inner side surface of the driven wheel (20).

4. The fully automatic grinding and polishing equipment for round bar fatigue specimens according to claim 3 is characterized in that: The base (1) is provided with an arc-shaped limiting groove (25), the outer side of the disc base (22) is connected with a connecting rod (26), the free end of the connecting rod (26) is provided with a limiting bolt (27), the free end of the limiting bolt (27) is inserted into the arc-shaped limiting groove (25), and the connecting rod (26) is fixedly connected to the arc-shaped limiting groove (25) by a fastening nut on the limiting bolt (27).

5. The fully automatic grinding and polishing equipment for round bar fatigue specimens according to claim 4 is characterized in that: The grinding and polishing roller assembly (7) comprises a roller support frame (28) and a fixing clamp (29) for clamping and fixing the roller support frame (28); the roller support frame (28) and the fixing clamp (29) are both in an upper and lower double-layer structure; the roller support frame (28) is circular; and the fixing clamp (29) is in a clamp shape with an open front end and bilaterally symmetrical. The roller support frame (28) is evenly provided with a plurality of fan-shaped through holes (31), the fan-shaped through holes (31) are arranged opposite to the top units one by one, a sanding belt roller (33) for supporting the sanding belt (32) is fixed in the fan-shaped through holes (31), a sanding belt baffle (34) for fixing the sanding belt path is fixed at both the upper and lower ends of the sanding belt roller (33), a plurality of nylon rollers (37) for guiding the sanding belt (32) are evenly provided on the outer edge of the roller support frame (28) and the outer edge of the fixing clamp (29), and at least one nylon roller (37) is provided on the roller support frame (28) between adjacent sanding belt rollers (33); A sanding belt box (38) for containing the sanding belt (32) is fixed on the left and right sides of the rear end interlayer of the fixing clamp (29), and a sanding belt transmission motor (40) and a first rubber wheel (41) are provided on the left and right sides of the rear end of the fixing clamp (29), respectively. The output shaft of the sanding belt transmission motor (40) is connected to the second rubber wheel (42), and the side surface of the first rubber wheel (41) is connected to the side surface of the second rubber wheel (42), and the sanding belt transmission motor (40) is electrically connected to the centralized control box (44); The abrasive belt (32) in the abrasive belt box (38) is guided by a nylon roller (37) on a roller support frame (28) and then sequentially wound around each abrasive belt roller (33). After the abrasive belt (32) has passed around the last abrasive belt roller (33), it is guided by a nylon roller (37) on a fixing clamp (29) to between the first rubber wheel (41) and the second rubber wheel (42), thereby squeezing the abrasive belt (32) for transmission.

6. The fully automatic grinding and polishing equipment for round bar fatigue specimens according to claim 5 is characterized in that: A connecting plate (35) is provided at the middle of the upper surface and the lower surface of the outer side of the fan-shaped through hole (31), and the connecting plate (35) is provided with an adjustment hole (36) for fixing and adjusting the front and rear position of the sanding belt roller (33). The sanding belt roller (33) is bolted to the connecting plate (35) via the adjustment hole (36).

7. The fully automatic grinding and polishing equipment for round bar fatigue specimens according to claim 6 is characterized in that: The first support column (4) passes through the center of the fixed disc (9) of the upper center assembly (5), the center of the roller support frame (28) and the center of the fixed disc (9) of the lower center assembly (8) from top to bottom in sequence. A second support column (50) is also fixed to the polishing area bracket (2). The free end of the second support column (50) passes through the fixing clamp (29) and is fixedly connected to the upper surface of the base (1).

8. The fully automatic grinding and polishing equipment for round bar fatigue specimens according to claim 7 is characterized in that: The adjustable cam transmission rod comprises a rotating cam (45), a main transmission rod (46) and a secondary transmission rod (47); a first adjusting bolt (48) for adjusting the length of the rotating cam (45) is provided on the rear side of the rotating cam (45); and a second adjusting bolt (49) for adjusting the length of the main transmission rod (46) located above the fixing clamp (29) is provided on the rear side of the fixing clamp (29); The lower end of the rotating cam (45) is connected to the upper end of the auxiliary transmission rod (47), the lower end of the auxiliary transmission rod (47) is connected to the upper end of the main transmission rod (46), the lower end of the main transmission rod (46) passes through the fixing clamp (29) and the main transmission rod (46) is fixedly connected to the fixing clamp (29) by a first adjusting bolt (48).

9. The fully automatic grinding and polishing equipment for round bar fatigue specimens according to claim 8, characterized in that: The auxiliary transmission rod (47) comprises an adjustment rod portion, an upper nut and a lower nut, the upper and lower portions of the adjustment rod portion are both provided with external threads, the upper nut and the lower nut are both provided with internal threads, the upper nut and the lower nut are respectively threadedly connected to the upper and lower portions of the adjustment rod portion, and the length of the auxiliary transmission rod (47) is adjusted by different connection positions of the upper nut and the lower nut with the adjustment rod portion.

10. The fully automatic grinding and polishing equipment for round bar fatigue specimens according to claim 9, characterized in that: The roller support frame (28) is evenly divided into two left and right parts along the radial direction, wherein the sanding belt box (38) located on the left side provides the sanding belt (32) for the sanding belt roller (33) in the left half of the roller support frame (28), and drives the sanding belt (32) in the left half of the roller support frame (28) through the sanding belt drive motor (40) located on the left side; the sanding belt box (38) located on the right side provides the sanding belt (32) for the sanding belt roller (33) in the right half of the roller support frame (28), and drives the sanding belt (32) in the right half of the roller support frame (28) through the sanding belt drive motor (40) located on the right side.

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