Forging parts polishing equipment

Abstract

The invention relates to the technical field of mechanical processing, and discloses a forged part polishing processing device, comprising a crankshaft clamping mechanism and two groups of polishing mechanisms, which are symmetrically arranged with the axis passing through the crankshaft connecting rod journal as the symmetry axis, wherein one group of polishing mechanisms comprises a support frame, a grinding wheel and a rotating and swinging mechanism, a rotating driving part is connected to the support frame, and a first hinge shaft is fixed on the upper and lower sides of the end face of one end of the grinding wheel respectively, and the rotating and swinging mechanism is arranged between the support frame and the grinding wheel, and the rotating and swinging mechanism comprises a rotating driving part, two groups of first swinging frames and two groups of second swinging frames; the invention realizes the simultaneous polishing process of the upper half and the lower half of the crankshaft connecting rod journal by fixing the crankshaft and then using two groups of polishing mechanisms symmetrically arranged with the axis passing through the crankshaft connecting rod journal as the symmetry axis, and the polishing process always moves in contact with the crankshaft connecting rod journal, and because it is not subject to changes in elastic expansion and contraction, the polishing effect is more uniform.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a forging piece polishing processing device. Background Art

[0002] As one of the core components of the fracturing pump transmission system, the crankshaft is usually composed of a main journal, a connecting rod journal and a crank. It mainly plays the role of converting power and transmitting torque. It transmits power to other components through rotational motion to drive the fracturing pump. The design and manufacturing quality of the crankshaft directly affects the efficiency and life of the fracturing pump.

[0003] During the processing of the crankshaft, it needs to be forged and shaped first, and the forged crankshaft also needs to be polished. Polishing can improve the surface finish and roughness of the crankshaft, enhance its wear resistance and fatigue resistance, and meet production needs. Due to the special structure of the crankshaft, when it is clamped and rotated, the connecting rod journal usually rotates eccentrically relative to the main journal. Therefore, the general rotary polishing lathe can only use the grinding wheel to perform normal polishing operations on the rotating main journal, and it is difficult to directly polish the eccentrically rotating connecting rod journal.

[0004] At present, there are two main ways to polish the eccentrically rotating connecting rod journal. One is to polish the rotating connecting rod journal by manually holding a polishing belt or other polishing structure. The hand-held method has high labor intensity and low polishing accuracy, and has been gradually eliminated. The other is to rely on a special automatic polishing structure to achieve an automatic polishing process. These automatic polishing structures are usually composed of an elastic abutment structure and a grinding structure. The elastic force is used to abut the grinding structure against the rotating connecting rod journal for grinding. However, this elastic abutment grinding method is difficult to control the fitting force during the polishing process. There will be a problem that it is difficult to keep the grinding structure and the connecting rod journal fitting with uniform force, which makes the contact pressure between the grinding structure and the connecting rod journal unevenly distributed, resulting in uneven polishing effect. For example, the patent with publication number CN116276607B discloses a crankshaft polishing device, which, through the cooperation of the set spring, guide slider, positioning rod and grinding wheel, compresses the spring by squeezing the grinding wheel against the crankshaft connecting rod journal during the rotation of the crankshaft connecting rod journal, and fits the grinding wheel to the crankshaft connecting rod journal for grinding through the elastic force of the spring. However, the height position of the crankshaft connecting rod journal is different after one circle of rotation, and the compression force generated on the spring is also different due to the different rotation positions, resulting in uneven distribution of contact pressure between the grinding wheel and the connecting rod journal, which leads to uneven force of the grinding wheel fitting the crankshaft connecting rod journal for grinding, and then leads to uneven polishing effect. For another example, the patent with publication number CN108818284B discloses a crankshaft polishing device and polishing method for a diesel engine. The device and polishing method also involve setting a polishing member consisting of an upper polishing seat, an upper semicircular polishing ring, a lower polishing seat and a lower semicircular polishing ring on the crankshaft connecting rod journal. With the cooperation of a telescopic rod and a spring, during the rotation of the crankshaft connecting rod journal, the elastic traction force of the spring is used to keep the crankshaft connecting rod shaft in contact with the polishing ring for grinding and polishing. Similarly, the elastic traction force of the spring is variable, so the contact force between the crankshaft connecting rod shaft and the polishing ring is in a constantly changing stage, making it difficult to maintain a uniform distribution of contact pressure between the polishing ring and the connecting rod journal, resulting in an uneven grinding effect. Summary of the invention

[0005] The purpose of the present invention is to provide a forged part polishing processing device to solve the problem that it is difficult to evenly polish the crankshaft connecting rod journal when the crankshaft connecting rod journal is automatically polished.

[0006] The technical solution of the present invention is:

[0007] A forged part polishing processing device comprises a crankshaft clamping mechanism for clamping and fixing both ends of a crankshaft, and also comprises two groups of polishing mechanisms, which are symmetrically arranged with the axis passing through the crankshaft connecting rod journal as the symmetry axis, wherein one group of the polishing mechanisms comprises a support frame, a grinding wheel and a rotating and swinging mechanism, and the upper and lower sides of the end surface of one end of the grinding wheel are respectively fixed with a first hinge shaft, and the rotating and swinging mechanism is arranged between the support frame and the grinding wheel. The rotating and swinging mechanism comprises a rotating drive unit, two groups of first swing frames and two groups of second swing frames, the rotating drive unit is connected to the support frame, the rotating drive unit has an output shaft, the two groups of first swing frames are arranged in parallel up and down, the first swing frame has an arc segment and two connecting segments, one end of the two connecting segments is fixed to the two ends of the arc segment, and the other ends of the two connecting segments intersect to the arc segment. The two connecting sections of the first swing frame on the upper side are connected to the output shaft of the rotation driving unit at the intersection of the two connecting sections in the first swing frame on the lower side, and are hinged to the support frame at the intersection of the two connecting sections. The two groups of second swing frames are symmetrically arranged on the left and right, and the second swing frames have a connecting rod and two horizontal sections, and the two horizontal sections are respectively fixed on one end and the middle part of the connecting rod. The two horizontal sections of the second swing frame on the left side are respectively hinged to the upper ends of the arc sections in the two groups of first swing frames through the third hinge shaft, and the two horizontal sections of the second swing frame on the right side are respectively hinged to the lower ends of the arc sections in the two groups of first swing frames through the fourth hinge shaft. The other ends of the connecting rods in the two groups of second swing frames are provided with curved sections, and are respectively hinged to the first hinge shaft through the curved sections.

[0008] Preferably, as a further improvement of the present invention, the output shaft of the rotary drive unit is vertically colinearly arranged with the second hinge shaft.

[0009] Preferably, as a further improvement of the present invention, the first hinge shaft, the third hinge shaft and the fourth hinge shaft are all hinge bolts, and the ends of the hinge bolts are connected with hinge nuts.

[0010] Preferably, as a further improvement of the present invention, the rotating drive unit includes a first motor and a motor seat, the motor seat is fixed on a support frame, the first motor is fixed on the motor seat, and the output shaft of the first motor passes through the support frame and is fixed at the center of the first swing frame located on the upper side.

[0011] Preferably, as a further improvement of the present invention, a vertical spacing adjustment mechanism is provided between the two groups of polishing mechanisms, and the vertical spacing adjustment mechanism includes a mounting seat, a bidirectional lead screw, two first nut seats and a second motor, the mounting seat is arranged on one side of the support frame, and a strip groove is opened on the side wall of the mounting seat facing the support frame; the bidirectional lead screw is vertically arranged in the strip groove, and the lower end of the bidirectional lead screw is rotatably connected to the inner bottom surface of the strip groove; the two first nut seats are respectively correspondingly sleeved and connected to the upper and lower sides of the bidirectional lead screw, and the two first nut seats are slidably clamped in the inside of the strip groove, and the side walls of the two first nut seats are respectively fixedly connected to the two support frames through the connecting frame, and the second motor is fixed on the top of the mounting seat, and the upper end of the bidirectional lead screw extends to the outside of the mounting seat and is connected to the output shaft of the second motor.

[0012] Preferably, as a further improvement of the present invention, two positioning members are fixed at the notch of the strip-shaped groove, and the two positioning members are used to position the extreme positions of the two first nut seats moving towards each other.

[0013] Preferably, as a further improvement of the present invention, a linear moving mechanism is connected to the bottom of the mounting seat, and the linear moving mechanism is used to drive the mounting seat to move along the axial direction of the crankshaft. The linear moving mechanism includes a first guide groove, a third motor, a first lead screw and a second nut seat. The first guide groove is arranged along the axial direction of the crankshaft, and the third motor is arranged on the outside of the first guide groove. The first lead screw is arranged in the first guide groove, and one end of the first lead screw is rotatably connected to the first guide groove, and the other end of the first lead screw extends to the outside of the first guide groove and is connected to the output shaft of the third motor. The second nut seat is sleeved and connected to the first lead screw and is slidably connected in the first guide groove. The bottom of the mounting seat is fixed to the top of the second nut seat.

[0014] Preferably, as a further improvement of the present invention, the crankshaft clamping mechanism includes a clamping mount, a tailstock and a horizontal spacing adjustment mechanism, a three-jaw chuck is installed on one side wall of the clamping mount, a first support rod is provided at the bottom of the clamping mount, the tailstock is arranged on the opposite side of the three-jaw chuck, a top is connected to the tailstock, the horizontal spacing adjustment mechanism is arranged below the tailstock, and the output end of the horizontal spacing adjustment mechanism is connected to the bottom of the tailstock through a second support rod, for adjusting the horizontal spacing of the top from the three-jaw chuck.

[0015] Preferably, as a further improvement of the present invention, both the first support rod and the second support rod are telescopic rods.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] Different from the traditional grinding method, the present invention fixes the crankshaft first, and then uses two groups of polishing mechanisms symmetrically arranged with the axis of the crankshaft connecting rod journal as the symmetry axis to realize the polishing process of the crankshaft connecting rod journal. Each polishing mechanism drives the grinding wheel to reciprocate around the half circle of the crankshaft connecting rod journal through the set rotating and swinging mechanism to realize polishing, thereby realizing the simultaneous polishing process of the upper and lower halves of the crankshaft connecting rod journal. During the polishing process, the grinding wheel always moves in contact with the crankshaft connecting rod journal. Compared with the elastic abutment grinding structure, it is not affected by the changes of elastic expansion and contraction, so the grinding effect is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the forging polishing processing device of the present invention.

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the forging polishing processing device of the present invention from another perspective.

[0020] Figure 3 It is a three-dimensional structural schematic diagram of the polishing mechanism in the forging polishing processing device of the present invention.

[0021] Figure 4 It is a schematic diagram of the position of one side of the polishing mechanism in the forging polishing processing device of the present invention when performing polishing.

[0022] Figure 5 It is a schematic diagram of the other side position of the polishing mechanism in the forging polishing processing device of the present invention when performing polishing.

[0023] Figure 6 It is a schematic diagram of the side cross-sectional structure of the forging polishing processing device of the present invention.

[0024] Figure 7 It is a schematic diagram of the top view of the structure of the forging polishing processing device of the present invention.

[0025] Figure 8 It is a schematic diagram of the front structure of the forging polishing processing device of the present invention. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1 To the attached Figure 8 , the specific implementation methods of the present invention are described in detail. In the description of the invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the invention, unless otherwise specified, "plurality" means two or more.

[0028] Example

[0029] like Figures 1 to 8 As shown, an embodiment of the present invention provides a forging polishing processing device, including a crankshaft clamping mechanism and two sets of polishing mechanisms.

[0030] Among them, the crankshaft clamping mechanism includes a clamping mount 81, a tailstock 84 and a horizontal spacing adjustment mechanism 86. A three-jaw chuck 82 is installed on one side wall of the clamping mount 81. A first support rod 83 is provided at the bottom of the clamping mount 81. The tailstock 84 is arranged on the opposite side of the three-jaw chuck 82. A center point 85 is connected to the tailstock 84. The horizontal spacing adjustment mechanism 86 is arranged below the tailstock 84. The output end of the horizontal spacing adjustment mechanism is connected to the bottom of the tailstock 84 through a second support rod 87, which is used to adjust the horizontal spacing between the center point 85 and the three-jaw chuck 82.

[0031] Before grinding and polishing the crankshaft 1, the two ends of the crankshaft 1 are clamped and fixed by using a crankshaft clamping mechanism, that is, the connecting flange at one end of the crankshaft 1 is centered and clamped by the set three-jaw chuck 82, and then the horizontal spacing adjustment mechanism is used to adjust the horizontal spacing between the top 85 and the three-jaw chuck 82, so that the top 85 can align the axis of the other end of the crankshaft 1 to keep the crankshaft 1 as a whole in a horizontal and fixed state.

[0032] Among them, refer to Figure 3 As shown, the two sets of polishing mechanisms are symmetrically arranged with the axis of the crankshaft connecting rod journal 11 as the symmetry axis. For the convenience of description, Figure 3The structure of a group of polishing mechanisms located in the upper right corner is explained, and the polishing mechanism includes a support frame 2, a grinding wheel 3 and a rotating and swinging mechanism. The support frame 2 is arranged above the crankshaft 1, and the grinding wheel 3 is arranged on the right side of the crankshaft connecting rod journal 11. The upper and lower sides of the end surface of one end of the grinding wheel 3 are respectively fixed with a first hinge shaft 31, and the rotating and swinging mechanism is arranged between the support frame 2 and the grinding wheel 3, and is used to drive the grinding wheel 3 to rotate around the upper half of the crankshaft connecting rod journal 11 to achieve grinding. The rotating and swinging mechanism includes a rotating drive part 41, two groups of first swing frames 42 and two groups of second swing frames 44. The rotating drive part 41 is connected to the support frame 2, and the rotating drive part 41 has an output shaft. The two groups of first swing frames 42 are arranged in parallel up and down. The first swing frame 42 is fan-shaped, with an arc segment and two connecting segments. One end of the two connecting segments is fixed to the two ends of the arc segment, and the other ends of the two connecting segments intersect at the center of the arc segment and are fixedly connected to each other. The first swing frame 44 located on the upper side The intersection of the two connecting sections in the movable frame 42 is connected to the output shaft of the rotating drive unit 41, and the intersection of the two connecting sections in the first swinging frame 42 located on the lower side is hinged to the support frame 2 through the second hinge shaft 43. The two groups of second swinging frames 44 are symmetrically arranged on the left and right. The second swinging frame 44 is F-shaped, and has a connecting rod and two horizontal sections. The two horizontal sections are respectively fixed at one end and the middle of the connecting rod. The two horizontal sections of the second swinging frame 44 on the left are respectively hinged to the upper ends of the arc sections in the two groups of first swinging frames 42 through the third hinge shaft 45, and the two horizontal sections of the second swinging frame 44 on the right are respectively hinged to the lower ends of the arc sections in the two groups of first swinging frames 42 through the fourth hinge shaft 46. The other end of the connecting rod in the two groups of second swinging frames 44 is provided with a curved section 47, and is respectively hinged to the first hinge shaft 31 through the curved section 47. In addition, the structure of a group of polishing mechanisms located on the lower left is the same, which belongs to a centrally symmetrical structure and will not be described here.

[0033] After the crankshaft 1 is clamped and fixed, the crankshaft connecting rod journal 11 is polished by the two sets of polishing mechanisms. The specific polishing process is as follows: since the grinding wheels 3 in the two sets of polishing mechanisms are symmetrically arranged with the axis of the crankshaft connecting rod journal 11 as the symmetry axis, during polishing, each grinding wheel 3 is driven to reciprocate half a circle by its own rotating and swinging mechanism, that is, the grinding wheel 3 on the right side is polished for the upper half circle of the crankshaft connecting rod journal 11, and the grinding wheel 3 on the left side is polished for the lower half circle of the crankshaft connecting rod journal 11. The polishing movement trajectory of the grinding wheel 3 driven by the rotating and swinging mechanism is as follows: Figure 4 and Figure 5As shown, the output shaft of the rotary drive unit 41 is controlled to achieve 180° reciprocating rotation to drive a group of fan-shaped first swing frames 42 connected thereto to rotate synchronously, and the group of first swing frames 42 is connected to another group of first swing frames 42 through two groups of second swing frames 44. Therefore, when the first swing frame 42 reciprocates 180° with the output shaft of the rotary drive unit 41 as the rotation center, the parallelogram structure formed by the two groups of second swing frames 44 drives the other group of first swing frames 42 to swing synchronously with the second hinge shaft 43 as the rotation center, thereby maintaining the swing stability of the two groups of second swing frames 44, and finally, the first hinge shaft 31 fixed on the upper and lower sides of one end surface of the grinding wheel 3 is pulled by the curved sections 47 arranged on the two groups of second swing frames 44, so that the grinding wheel 3 reciprocates half a circle around the crankshaft connecting rod journal 11, thereby realizing the grinding and polishing process.

[0034] Further, such as Figure 3 and Figure 4 As shown, in order to ensure that the rotating and swinging mechanism can drive the grinding wheel 3 to rotate smoothly around the crankshaft connecting rod journal 11 for polishing, the output shaft of the rotating drive part 41 and the second hinge shaft 43 are arranged vertically in a collinear manner, and when the crankshaft connecting rod journal 11 is polished, the vertical collinear arrangement is also maintained with the crankshaft connecting rod journal 11 after clamping and fixing. Through the above arrangement, it can be ensured that when the rotating drive part 41 drives the centers of the two groups of first swing frames 42 to rotate, the rotation centers of the three are maintained on the same vertical plane, thereby enabling the grinding wheel 3 to rotate around the center of the crankshaft connecting rod journal 11.

[0035] Further, such as Figure 3 and Figure 4 As shown, in order to ensure that the connecting parts at each hinge will not detach, the first hinge shaft 31, the third hinge shaft 45 and the fourth hinge shaft 46 are all set as hinge bolts, and the ends of the hinge bolts are connected with hinge nuts. The hinge nuts can be used for positioning to prevent detachment from the hinge bolts, and ensure that the two groups of first swing frames 42 are on the same vertical plane, and the two groups of second swing frames 44 are on the same vertical plane. At the same time, after the first hinge shaft 31 is set as the hinge bolt, it is also convenient to replace the grinding wheel 3 for grinding.

[0036] Specifically, the rotation drive unit 41 includes a first motor and a motor seat, the motor seat is fixed on the support frame 2, the first motor is fixed on the motor seat, and the output shaft of the first motor passes through the support frame 2 and is fixed to the center of the first swing frame 42 located on the upper side, wherein the first motor is a servo motor, which can control the rotation angle more accurately, ensuring that it can drive the first swing frame 42 to achieve an accurate rotation range of 180°.

[0037] In another embodiment of the present invention, in order to facilitate the taking of the crankshaft 1 and to center the polishing positions of the two groups of polishing mechanisms, a vertical spacing adjustment mechanism is provided between the two groups of polishing mechanisms, and the vertical spacing adjustment mechanism includes a mounting seat 51, a bidirectional lead screw 52, ​​two first nut seats 53 and a second motor 55. The mounting seat 51 is arranged on one side of the support frame 2, and a strip groove is opened on the side wall of the mounting seat 51 facing the support frame 2; the bidirectional lead screw 52 is vertically arranged in the strip groove, and the lower end of the bidirectional lead screw 52 is rotatably connected to the inner bottom surface of the strip groove; the two first nut seats 53 are respectively correspondingly sleeved and connected to the upper and lower sides of the bidirectional lead screw 52, ​​and the two first nut seats 53 are slidably clamped in the inside of the strip groove, and the side walls of the two first nut seats 53 are respectively fixedly connected to the two support frames 2 through the connecting frame 54, and the second motor 55 is fixed on the top of the mounting seat 51, and the upper end of the bidirectional lead screw 52 extends to the outside of the mounting seat 51 and is connected to the output shaft of the second motor 55.

[0038] In this embodiment, since the rotating and swinging mechanism can drive the grinding wheel 3 to rotate in the circumferential direction of the crankshaft connecting rod journal 11, before or after polishing, the two grinding wheels 3 can be driven to rotate until they are aligned vertically and then the positions of the two grinding wheels 3 are kept unchanged by controlling the two rotating and swinging mechanisms, and then the vertical spacing of the two support frames 2 is adjusted by the vertical spacing adjustment mechanism to clamp the two grinding wheels 3 on the upper and lower sides of the crankshaft connecting rod journal 11 or separate them from the crankshaft connecting rod journal 11. The specific adjustment principle of the spacing adjustment mechanism is as follows:

[0039] The two-way screw 52 is driven to rotate by controlling the second motor 55. Since the two first nut seats 53 are respectively connected to the two sides of the two-way screw 52, ​​and the two first nut seats 53 are movably mounted in the strip-shaped groove, when the two-way screw 52 rotates, the rotational motion is converted into a linear motion, thereby driving the two first nut seats 53 to approach or move away from each other. When the two first nut seats 53 approach each other, the two support frames 2 are driven to move synchronously, thereby driving the two grinding wheels 3 to approach each other to clamp and polish the crankshaft connecting rod journal 11. When the grinding is completed, the second motor 55 is controlled to drive the two-way screw The lever 52 rotates to separate the two first nut seats 53 from each other, thereby driving the two grinding wheels 3 to separate from each other, making it convenient to remove the crankshaft after grinding and polishing and place the next crankshaft to be polished. The automatic centering function can be achieved by setting the bidirectional screw 52 to ensure that the two grinding wheels 3 can fit the two side walls of the crankshaft connecting rod journal 11 for polishing. During the entire polishing process, the vertical spacing adjustment mechanism provides a stable supporting force to the grinding wheel 3. During the polishing process, the spacing between the two grinding wheels 3 can be dynamically adjusted through the vertical spacing adjustment mechanism to adjust the grinding and polishing surface thickness of the crankshaft connecting rod journal 11.

[0040] Furthermore, in order to be able to position the two first nut seats 53 close to each other and ensure that the two grinding wheels 3 can be clamped on the two side walls of the crankshaft connecting rod journal 11, two positioning members 6 are fixed at the notches of the strip grooves. The two positioning members 6 are used to position the extreme positions of the two nut seats 53 moving close to each other. The positioning members 6 can be travel switches or limit blocks. The set travel switch can control the second motor 55 to stop rotating after the sensed nut seat 53 moves to the set position.

[0041] In another embodiment of the present invention, in order to be able to polish each crankshaft connecting rod journal 11 on the crankshaft 1, a linear moving mechanism is connected to the bottom of the mounting seat 51, and the linear moving mechanism is used to drive the mounting seat 51 to move along the axial direction of the crankshaft 1. The linear moving mechanism includes a first guide groove 71, a third motor 72, a first lead screw 73 and a second nut seat 74. The first guide groove 71 is arranged along the axial direction of the crankshaft 1, the third motor 72 is arranged on the outside of the first guide groove 71, the first lead screw 73 is arranged in the first guide groove 71, and one end of the first lead screw 73 is rotatably connected to the inner wall of the first guide groove 71, and the other end of the first lead screw 73 extends to the outside of the first guide groove 71 and is connected to the output shaft of the third motor 72. The second nut seat 74 is sleeved and connected to the first lead screw 73, and is slidably connected in the first guide groove 71. The bottom of the mounting seat 51 is fixed to the top of the second nut seat 74.

[0042] After polishing a crankshaft connecting rod journal 11 on the crankshaft 1, the mounting seat 51 is driven to move along the axial direction of the crankshaft 1 through the linear moving mechanism to drive the two sets of polishing mechanisms to move to the next crankshaft connecting rod journal 11 for polishing. During the movement, the first lead screw 73 is driven to rotate by controlling the third motor 72. The rotation of the first lead screw 73 drives the second nut seat 74 to move along the length direction of the first guide groove 71, thereby driving the mounting seat 51 to translate as a whole. After moving to the next crankshaft connecting rod journal 11, the third motor 72 is in a locked state, and then the vertical spacing adjustment mechanism is used to adjust the vertical spacing of the two support frames 2, so that the two grinding wheels 3 are in contact with the crankshaft connecting rod journal 11 again for the next polishing process.

[0043] Among them, Figure 1 and Figure 7As shown, the structure of the horizontal spacing adjustment mechanism is similar to that of the linear movement mechanism. The horizontal spacing adjustment mechanism includes a second guide groove 861, a fourth motor 862, a second lead screw 863 and a third nut seat 864. The fourth motor 862 is arranged on the outside of the second guide groove 861, the second lead screw 863 is arranged in the second guide groove 861, and one end of the second lead screw 863 is rotatably connected to the inner wall of the second guide groove 861. The other end of the first lead screw 73 extends to the outside of the second guide groove 861 and is connected to the output shaft of the fourth motor 862. The third nut seat 864 is sleeved and connected to the The second lead screw 863 is on the second guide groove 861 and is slidably connected. The bottom of the tailstock 84 is fixed to the top of the second nut seat 74. When the horizontal spacing adjustment mechanism is used to adjust the horizontal spacing between the top 85 and the three-jaw chuck 82 to clamp the crankshaft 1, the fourth motor 862 is controlled to drive the second lead screw 863 to rotate. The rotation of the second lead screw 863 drives the third nut seat 864 to move along the length direction of the second guide groove 861, thereby driving the tailstock 84 and the top 85 to translate as a whole, so as to clamp the two end faces of the crankshaft 1 against each other through cooperation with the three-jaw chuck 82.

[0044] In another embodiment of the present invention, in order to be able to polish the main journal on the crankshaft 1, the first support rod 83 and the second support rod 87 are both set as telescopic rods, and the telescopic rods can be structural parts with telescopic functions such as electric cylinders or hydraulic cylinders. By setting the first support rod 83 and the second support rod 87 as telescopic rods, the heights of the clamping mounting seat 81 and the tailstock 84 can be adjusted synchronously, and the height of the crankshaft 1 can be adjusted by the cooperation of the three-jaw chuck 82 and the top 85, so that the main journal on the crankshaft 1 is moved to the same height as the original crankshaft connecting rod journal 11. Similar to the polishing process of the crankshaft connecting rod journal 11, since the diameter of the main journal of the crankshaft 1 is different from the diameter of the crankshaft connecting rod journal 11, the main journal size of the crankshaft 1 can be adapted by replacing the grinding wheel 3 with different diameters, thereby achieving grinding and polishing of the main journal on the crankshaft 1.

[0045] In summary, the present invention discloses a forging polishing processing device. Different from the traditional grinding method, the present invention fixes the crankshaft first, and then uses two groups of polishing mechanisms symmetrically arranged with the axis of the crankshaft connecting rod journal as the symmetry axis to realize the polishing process of the crankshaft connecting rod journal. Each polishing mechanism drives the grinding wheel to reciprocate around the half circle of the crankshaft connecting rod journal through the set rotating and swinging mechanism to realize polishing, thereby realizing the simultaneous polishing process of the upper and lower halves of the crankshaft connecting rod journal, and the grinding wheel always moves in contact with the crankshaft connecting rod journal during the polishing process. Compared with the elastic abutment grinding structure, it is not affected by the changes of elastic expansion and contraction, so the grinding force is more uniform.

[0046] The above disclosures are only several preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A forged part polishing device, comprising a crankshaft clamping mechanism for clamping and fixing both ends of a crankshaft (1), characterized in that: It also includes two groups of polishing mechanisms, which are symmetrically arranged with the axis of the crankshaft connecting rod journal (11) as the symmetry axis, and are respectively used to polish the upper and lower half-circle surfaces of the crankshaft connecting rod journal (11), wherein one group of the polishing mechanisms includes a support frame (2), a grinding wheel (3) and a rotating and swinging mechanism, wherein first hinge shafts (31) are respectively fixed on the upper and lower sides of one end surface of the grinding wheel (3), and the rotating and swinging mechanism is arranged between the support frame (2) and the grinding wheel (3), and the rotating and swinging mechanism includes: A rotation driving unit (41) connected to the support frame (2), wherein the rotation driving unit (41) has an output shaft; Two groups of first swing frames (42) are arranged in parallel up and down, the first swing frames (42) have an arc segment and two connecting segments, one end of the two connecting segments is fixed to the two ends of the arc segment, and the other ends of the two connecting segments intersect at the center of the arc segment and are fixedly connected to each other, the intersection of the two connecting segments in the first swing frame (42) on the upper side is connected to the output shaft of the rotation drive unit (41), and the intersection of the two connecting segments in the first swing frame (42) on the lower side is hinged to the support frame (2) through a second hinge shaft (43); The two groups of second swing frames (44) are symmetrically arranged on the left and right. The second swing frames (44) have a connecting rod and two horizontal sections. The two horizontal sections are respectively fixed to one end and the middle of the connecting rod. The two horizontal sections of the second swing frame (44) located on the left are respectively hinged to the upper ends of the arc sections in the two groups of first swing frames (42) through third hinge shafts (45). The two horizontal sections of the second swing frame (44) located on the right are respectively hinged to the lower ends of the arc sections in the two groups of first swing frames (42) through fourth hinge shafts (46). The other ends of the connecting rods in the two groups of second swing frames (44) are provided with bent sections (47) and are respectively hinged to the first hinge shafts (31) through the bent sections (47).

2. The forging polishing device according to claim 1, characterized in that: The output shaft of the rotary drive unit (41) and the second hinge shaft (43) are arranged vertically in a collinear manner.

3. The forging polishing device according to claim 2, characterized in that: The first hinge shaft (31), the third hinge shaft (45) and the fourth hinge shaft (46) are all hinge bolts, and the ends of the hinge bolts are connected with hinge nuts.

4. The forging polishing device according to claim 1, characterized in that: The rotary drive unit (41) comprises a first motor and a motor seat, wherein the motor seat is fixed on a support frame (2), the first motor is fixed on the motor seat, and the output shaft of the first motor passes through the support frame (2) and is fixed to the center of a first swing frame (42) located on the upper side.

5. The forging polishing device according to any one of claims 1 to 4, characterized in that: A vertical spacing adjustment mechanism is provided between the two groups of polishing mechanisms, and the vertical spacing adjustment mechanism comprises: A mounting seat (51) is arranged on one side of the support frame (2), and a strip-shaped groove is provided on the side wall of the mounting seat (51) facing the support frame (2); A bidirectional lead screw (52) is vertically arranged in the strip-shaped groove, and the lower end of the bidirectional lead screw (52) is rotatably connected to the inner bottom surface of the strip-shaped groove; Two first nut seats (53) are respectively sleeved and connected to the upper and lower sides of the bidirectional lead screw (52), and the two first nut seats (53) are slidably mounted inside the strip-shaped groove, and the side walls of the two first nut seats (53) are respectively fixedly connected to the two support frames (2) through the connecting frames (54); The second motor (55) is fixed on the top of the mounting seat (51), and the upper end of the bidirectional lead screw (52) extends outside the mounting seat (51) and is connected to the output shaft of the second motor (55).

6. The forging polishing device according to claim 5, characterized in that: Two positioning members (6) are fixed at the notches of the strip-shaped grooves, and the two positioning members (6) are used to position the two first nut seats (53) at their extreme positions of movement towards each other.

7. The forging polishing device according to claim 5, characterized in that: A linear motion mechanism is connected to the bottom of the mounting seat (51), and the linear motion mechanism is used to drive the mounting seat (51) to move along the axial direction of the crankshaft (1). The linear motion mechanism comprises a first guide groove (71), a third motor (72), a first lead screw (73) and a second nut seat (74). The first guide groove (71) is arranged along the axial direction of the crankshaft (1), the third motor (72) is arranged outside the first guide groove (71), the first lead screw (73) is arranged inside the first guide groove (71), and one end of the first lead screw (73) is rotatably connected to the first guide groove (71), and the other end of the first lead screw (73) extends to the outside of the first guide groove (71) and is connected to the output shaft of the third motor (72). The second nut seat (74) is sleeved and connected to the first lead screw (73) and is slidably connected inside the first guide groove (71). The bottom of the mounting seat (51) is fixed to the top of the second nut seat (74).

8. The forging polishing device according to claim 5, characterized in that: The crankshaft clamping mechanism comprises: A clamping mounting seat (81), a three-jaw chuck (82) is installed on one side wall, and a first support rod (83) is provided at the bottom of the clamping mounting seat (81); A tailstock (84) is arranged on the opposite side of the three-jaw chuck (82), and a top (85) is connected to the tailstock (84); A horizontal spacing adjustment mechanism (86) is arranged below the tailstock (84), and an output end of the horizontal spacing adjustment mechanism is connected to the bottom of the tailstock (84) through a second support rod (87) for adjusting the horizontal spacing between the top (85) and the three-jaw chuck (82).

9. The forging polishing device according to claim 8, characterized in that: The first support rod (83) and the second support rod (87) are both telescopic rods.

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