Crank throw outer circle grinding equipment

Abstract

The utility model relates to the field of crankshaft machining equipment, in particular to crank throw outer circle grinding equipment which comprises a head clamp, a grinding wheel is rotatably arranged on one side of the head clamp and connected with a horizontal driving mechanism, a conical clamping sleeve hole is formed in the head clamp, and a clamping sleeve is slidably connected in the clamping sleeve hole. The outer wall of one end of the clamping sleeve is provided with a conical surface with the conicity consistent with the conicity of the clamping sleeve hole, the end, provided with the conical surface, of the clamping sleeve is divided into three clamping blocks, the other ends of the three clamping blocks are integrally formed, the free ends of the three clamping blocks can be close to each other under the action of external force, and the clamping sleeve is connected with a hydraulic driving mechanism. The head clamp is installed on the machine tool and connected with a main shaft of the machine tool, the clamping sleeve is used for clamping the crankshaft, the head clamp is connected with a motor, a positioning rod is arranged on the side, away from the grinding wheel, of the head clamp in a sliding mode and used for positioning the crank throw before the crankshaft is inserted into the clamping sleeve, and the axis of the crank throw is aligned with the rotating center of the motor in the axial direction. The utility model solves the problem in the prior art that the precision is influenced by using two clamps to clamp the crankshaft.

Description

Technical Field

[0001] The utility model relates to the field of crankshaft processing equipment, and particularly relates to an outer circle grinding equipment for crank throws. Background Art

[0002] During the production process of the crankshaft, the outer circle of the crank throw needs to be ground to ensure its surface quality and dimensional accuracy. At present, when the applicant grinds the crank throw of a single-crank crankshaft, two fixtures are usually used to clamp both ends of the crankshaft respectively. However, this clamping method has some defects in actual production:

[0003] 1. During the grinding process, the crankshaft needs to rotate to ensure that the entire outer circle surface is evenly ground. Therefore, the two fixtures need to rotate synchronously; in addition, the heights of the two fixtures also need to be kept consistent, otherwise the crankshaft will tilt. If the two fixtures rotate out of sync or their heights are inconsistent, it may affect the grinding accuracy and result in uneven surface quality of the processed crankshaft.

[0004] 2. Since the two fixtures need to bear a large load during use, they are prone to wear or damage and need to be repaired or replaced regularly. The use of the two fixtures increases the complexity of maintenance and reduces the production efficiency. Content of the Utility Model

[0005] The utility model aims to provide an outer circle grinding equipment for crank throws to solve the problem that the use of two fixtures to clamp the crankshaft from both ends in the prior art is likely to affect the accuracy.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme:

[0007] The outer circle grinding equipment for crank throws includes a head clamp. A grinding wheel is rotatably arranged on one side of the head clamp. The grinding wheel is connected with a horizontal driving mechanism. A conical sleeve hole is formed in the head clamp. A sleeve is slidably connected in the sleeve hole. A conical surface with the same taper as that of the sleeve hole is arranged on the outer wall of one end of the sleeve. And the sleeve is divided into three clamping blocks at the end provided with the conical surface. The other ends of the three clamping blocks are integrally formed. The free ends of the three clamping blocks can approach each other under the action of an external force. The sleeve is connected with a hydraulic driving mechanism. The head clamp is installed on the machine tool and connected with the main shaft of the machine tool. The sleeve is used for clamping the crankshaft. The head clamp is connected with a motor. A positioning rod is slidably arranged on the side of the head clamp far away from the grinding wheel. The positioning rod is used for positioning the crank throw before the crankshaft is inserted into the sleeve. The axis of the crank throw is axially aligned with the rotation center of the motor.

[0008] Preferably, as an improvement, the head clamp includes a chuck and a clamp seat. The clamp seat is fixed on the machine tool. The chuck is slidably connected to the clamp seat. An adjusting component for vertically adjusting the position of the chuck is arranged on the clamp seat.

[0009] Preferably, as an improvement, the adjusting assembly includes a positioning bolt, a positioning nut and an adjusting bolt. Positioning bolts are arranged on both sides of the chuck. A T-shaped groove is vertically formed in the chuck seat. The head of the positioning bolt is slidably connected in the T-shaped groove. The rod portion of the positioning bolt passes through the T-shaped groove and penetrates through the chuck. The positioning nut is threadedly connected to the rod portion of the positioning bolt. The adjusting bolt is vertically threadedly connected to the top of the chuck seat, and the bottom end of the adjusting bolt is rotatably connected to the chuck.

[0010] Preferably, as an improvement, a measuring instrument for measuring the crank diameter is arranged on the side of the chuck away from the grinding wheel.

[0011] The principle and beneficial effects of this solution are as follows:

[0012] 1. In this solution, the crankshaft is clamped by the head chuck and the collet. One end of the crankshaft is inserted into the collet. The hydraulic drive mechanism drives the end of the collet provided with the clamping block to move to the small-diameter end of the collet hole. Since the diameter of the collet hole is reduced, the three clamping blocks are squeezed together, thereby clamping the crankshaft. With this design in this solution, only one end of the crankshaft needs to be clamped. Compared with the prior art of clamping both ends, it is not only convenient to clamp, but also will not affect the machining accuracy of the crankshaft due to factors such as the height difference and asynchronism of the two fixtures. The accuracy is easier to control, and the maintenance is convenient.

[0013] 2. In this solution, the collet hole is eccentrically arranged on the head chuck, and the crankshaft is positioned by means of the positioning rod. After the end of the crankshaft is inserted into the collet hole, when the crankpin just abuts against the positioning rod, it means that the clamping is correct. The axis of the crankpin after clamping is axially aligned with the axis of the machine tool spindle. Such a design makes the crankshaft rotate around the axis of the crankpin when the spindle drives the crankshaft to rotate, that is, the crankpin part can rotate around its axis, so that the outer circle of the crankpin can be evenly contacted with the grinding wheel to complete the grinding of the outer circle of the crankpin.

[0014] 3. In this solution, the chuck is slidably arranged on the chuck seat. After loosening the positioning nut, by rotating the adjusting bolt, the positioning bolt and the chuck as a whole can move up and down, thereby adjusting the position height of the chuck. After the adjustment is in place, tighten the positioning nut to lock the chuck.

[0015] 4. In this solution, a measuring instrument is arranged on one side of the chuck. The measuring instrument is used to measure the outer circle of the crankpin. If the outer circle diameter meets the standard, the grinding is stopped. If the outer circle diameter does not meet the standard, the grinding continues until it meets the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a partial side view of an embodiment of the present invention.

[0017] Figure 2 It is a partial front view of an embodiment of the present invention.

[0018] Figure 3This is a partial front view of an embodiment of the present utility model.

[0019] Figure 4 This is a partial cross-sectional view of an embodiment of the present utility model.

[0020] Figure 5 This is a schematic structural diagram of a jacket in an embodiment of the present utility model.

[0021] Figure 6 This is a front view of a clamping seat in an embodiment of the present utility model.

[0022] Figure 7 This is a schematic diagram of a T-shaped groove in an embodiment of the present utility model. Specific embodiments

[0023] The following is a further detailed description through specific embodiments:

[0024] The reference numerals in the accompanying drawings of the specification include: machine tool 1, clamping seat 2, chuck 22, positioning nut 23, positioning bolt 24, adjusting bolt 25, T-shaped groove 26, grinding wheel 3, crankshaft 4, crankpin 41, jacket 5, jacket hole 51, conical surface 52, clamping block 53, positioning rod 6, measuring instrument 7, measuring arm 71, measuring head 72.

[0025] Embodiment:

[0026] As Figure 1 、 Figure 2 and Figure 3 shown, the crankpin outer circle grinding equipment includes a head clamp, a grinding wheel 3, a positioning rod 6 and a measuring instrument 7. The head clamp includes a chuck 22 and a clamping seat 2. The clamping seat 2 is fixed on the machine tool 1 by bolts. The chuck 22 is slidably connected to the clamping seat 2. The clamping seat 2 is provided with an adjusting assembly for vertically adjusting the position of the chuck 22. Specifically, the adjusting assembly includes a positioning bolt 24, a positioning nut 23 and an adjusting bolt 25. Two positioning bolts 24 are respectively penetrated through both sides of the chuck 22. Combining Figure 6 and Figure 7 shown, the clamping seat 2 is vertically provided with a T-shaped groove 26 with a T-shaped cross-section. The head of the positioning bolt 24 is slidably connected in the T-shaped groove 26 and is axially limited by the T-shaped groove 26. The rod portion of the positioning bolt 24 passes through the T-shaped groove 26 and extends outside the chuck 22. The positioning nut 23 is threadedly connected to the rod portion of the positioning bolt 24. The adjusting bolt 25 is vertically threadedly connected to the top of the clamping seat 2 and the bottom end of the adjusting bolt 25 is rotatably connected to the chuck 22.

[0027] Combining Figure 4 and Figure 5As shown in the figure, a conical jacket hole 51 is formed inside the head clamp. A jacket 5 is slidably connected inside the jacket hole 51. A conical surface 52 with the same taper as that of the jacket hole 51 is formed on the outer wall of one end of the jacket 5. And the jacket 5 is divided into three clamping blocks 53 at the end where the conical surface 52 is formed. The other ends of the three clamping blocks 53 are integrally formed. The three clamping blocks 53 can approach each other under the action of an external force. The jacket 5 is connected with a hydraulic driving mechanism, and the hydraulic driving mechanism is used to drive the jacket 5 to slide inside the jacket hole 51. In this embodiment, the hydraulic driving mechanism is a hydraulic press. The head clamp is connected with a motor. The positioning rod 6 is slidably arranged on the front side of the head clamp. The positioning rod 6 is driven to slide by a hydraulic cylinder to approach or move away from the crankshaft 4. The positioning rod 6 is used to position the crankpin 41 before the crankshaft 4 is inserted into the jacket 5, so that after the crankshaft 4 is inserted into the jacket hole 51, the axis of the crankpin 41 is axially aligned with the rotation center of the motor.

[0028] A grinding wheel 3 is rotatably installed on the rear side of the head clamp. The grinding wheel 3 is driven to rotate by a motor. The grinding wheel 3 is connected with a horizontal driving mechanism. In this embodiment, the horizontal driving mechanism is a hydraulic cylinder. A measuring instrument 7 for measuring the diameter of the crankpin 41 is further arranged on the front side of the chuck 22. In this embodiment, the measuring instrument 7 adopts a measuring instrument 7 for measuring diameter in the prior art, such as an online automatic external diameter measuring instrument 7 for a grinding machine. The measuring instrument 7 is driven by a hydraulic cylinder to approach or move away from the crankshaft 4. When approaching the crankshaft 4, the measuring heads 72 at the free ends of the two measuring arms 71 of the measuring instrument 7 are respectively inserted from the top and bottom of the crankpin 41 to clamp the crankpin 41 from above and below, thereby measuring the diameter of the crankpin 41. If the outer diameter of the crankpin 41 is greater than the preset size, the two measuring arms 71 will be squeezed and separated outward by the crankpin 41. After the measuring arms 71 retract, the system will continue to grind. If it is measured that the outer circle of the crankpin 41 meets the preset size, the two measuring arms 71 will not move, and the system will stop grinding.

[0029] The working principle of the crankpin outer circle grinding equipment is as follows:

[0030] Adjust the chuck 22 to a suitable height according to the model of the crankshaft 4. The specific adjustment method is as follows: Loosen the four positioning nuts 23, and then rotate the adjusting bolt 25 to drive the chuck 22 to move in the vertical direction. After the chuck 22 moves to the required position, tighten the positioning nuts 23 to lock the chuck 22, and then the adjustment is completed.

[0031] After the adjustment is completed, the hydraulic cylinder drives the positioning rod 6 to extend to the chuck 22, and inserts the left end of the crankshaft 4 into the jacket 5 (the jacket 5 is pre-assembled into the jacket hole 51). After insertion, make sure that the crankpin 41 can abut against the positioning rod 6. After insertion, drive the jacket 5 to move towards the small-diameter end of the jacket hole 51 through the hydraulic driving mechanism. Since the diameter of the hole wall of the jacket hole 51 decreases, the three clamping blocks 53 on the jacket 5 are pressed to close together, and the three clamping blocks 53 clamp the crankshaft 4, thereby completing the clamping and fixing of the crankshaft 4.

[0032] After the crankshaft 4 is fixed, the positioning rod 6 is withdrawn. The horizontal drive mechanism drives the grinding wheel 3 to approach the crankshaft 4 and contact the crankpin 41. Subsequently, the grinding wheel 3 is driven to rotate. At the same time, the main shaft of the machine tool 1 drives the chuck 22 and the crankshaft 4 to rotate. The crankshaft 4 rotates with the axis of the crankpin 41 as the rotation center, that is, the crankpin 41 rotates around its axis. Thus, the outer circle of the crankpin 41 uniformly contacts the grinding wheel 3, and the grinding of the outer circle of the crankpin 41 is completed. After grinding for a certain period of time, the hydraulic cylinder drives the measuring instrument 7 to move, so that the two measuring arms 71 of the measuring instrument 7 are respectively inserted into the top and bottom of the crankpin 41. If the outer diameter of the crankpin 41 is greater than the preset size, the two measuring arms 71 will be squeezed and separated outward by the crankpin 41. After the measuring arms 71 retract, the system will continue to grind. If it is measured that the outer circle of the crankpin 41 meets the preset size, the grinding will stop, and the grinding of the crankpin 41 will be completed.

[0033] The above are only the embodiments of the present invention. Specific technical solutions and / or common knowledge such as characteristics well known in the art are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners and the like described in the specification can be used to explain the content of the claims.

Claims

1. Crank outer circle grinding equipment, characterized by: It includes a head clamp, a grinding wheel is rotatably provided on one side of the head clamp, the grinding wheel is connected to a horizontal driving mechanism, a conical jacket hole is opened in the head clamp, a jacket is slidably connected in the jacket hole, a conical surface with a taper consistent with the taper of the jacket hole is provided on the outer wall of one end of the jacket, and the jacket is divided into three clamping blocks at the end provided with the conical surface, the other ends of the three clamping blocks are integrally formed as one body, and the free ends of the three clamping blocks can be brought together under the action of external force, the jacket is connected to a hydraulic driving mechanism, the head clamp is installed on the machine tool and connected to the main shaft of the machine tool, the jacket is used to clamp the crankshaft, the head clamp is connected to the motor, a positioning rod is slidably provided on the side of the head clamp away from the grinding wheel, the positioning rod is used to position the crank before the crankshaft is inserted into the jacket, and the axis of the crank is axially aligned with the rotation center of the motor.

2. The crank outer circle grinding equipment according to claim 1, characterized in that: The head clamp comprises a clamp head and a clamp seat, the clamp seat is fixed on the machine tool, the clamp head is slidably connected to the clamp seat, and an adjustment component for vertically adjusting the position of the clamp head is arranged on the clamp seat.

3. The crank outer circle grinding equipment according to claim 2, characterized in that: The adjustment assembly includes a positioning bolt, a positioning nut and an adjusting bolt. Positioning bolts are arranged on both sides of the chuck. A T-slot is vertically opened on the clamp seat. The head of the positioning bolt is slidably connected in the T-slot. The rod of the positioning bolt passes through the T-slot and passes through the chuck. The positioning nut is threadedly connected to the rod of the positioning bolt. The adjusting bolt is vertically threadedly connected to the top of the clamp seat, and the bottom end of the adjusting bolt is rotatably connected to the chuck.

4. The crank outer circle grinding equipment according to claim 3, characterized in that: A measuring instrument for measuring the crank diameter is arranged on the side of the chuck away from the grinding wheel.

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