Adjustable chain type crankshaft stepping device

Abstract

According to the adjustable chain type crankshaft stepping device provided by the utility model, a speed reducing motor is adopted to drive a chain wheel and a chain to drive a driving shaft and a driven shaft mechanism to rotate, and the driven shaft mechanism forms a crankshaft, so that a swing arm of a connected swing arm stepping mechanism rotates in a circle manner through transmitted power; the stepping action of the received part workpiece is realized; the adjusting assembly enables the stepping assemblies to move on the linear guide rail sliding block mechanism through the lead screw nut mechanism, adjustment of the positions of the stepping assemblies is achieved, and the two sets of stepping assemblies of the device can be used for containing shaft or rack part workpieces with different lengths. The device disclosed by the utility model is simple in structure, stable in operation and suitable for different types of shaft or rack part workpieces, so that time and labor are saved in the butt joint process of production, the production efficiency is greatly improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of part production equipment and relates to a crankshaft stepping device. Background Art

[0002] Shaft parts and rack parts are key parts in mechanical equipment. In the processing and production of such parts, semi-automatic or fully automatic production lines are often used. In the production line, the front and back processes often cannot be directly connected, and a docking process for part workpieces needs to be added between the front and back processes. In the current production process, the docking process of part workpieces is generally carried out by a conveyor or a stepping mechanism. However, there are too many varieties of shaft parts and rack parts, with different diameters and lengths. At present, the conveyor or the stepping mechanism is only applicable to shaft parts or rack parts of the same variety. In the docking process of the production of shaft parts or rack parts of different varieties, it is necessary to replace the corresponding conveyor or stepping mechanism for docking according to different varieties of parts, which is time-consuming and laborious and has a high cost. Content of the Utility Model

[0003] To solve the problems of time-consuming, laborious and high cost in the docking process of the production of shaft parts and rack parts described in the background art, the utility model provides an adjustable chain-type crankshaft stepping device.

[0004] The technical solution of the utility model includes a frame, a reduction motor and at least two groups of stepping forward components symmetrically arranged along the reduction motor; the reduction motor is installed at the lower part of the frame; the stepping forward components include a stepping component and an adjustment component; the stepping component is divided into two groups, one group of the stepping component is fixed on the frame to form a fixed side, and the other group of the stepping component is connected with the adjustment component to form a moving side; the stepping component includes a material supporting mechanism, a driving sprocket chain mechanism, a driving shaft, a driven sprocket chain mechanism, a driven shaft mechanism and a swing arm stepping mechanism; the material supporting mechanism is detachably installed on the frame and is used for placing part workpieces; the driving sprocket chain mechanism is connected with the reduction motor and transmits power to the driving shaft; the driven sprocket chain mechanism connects the driving shaft and the driven shaft mechanism and transmits power to the driven shaft mechanism; the driven shaft mechanism forms a crankshaft, and the crankshaft is connected with the swing arm stepping mechanism; the swing arm stepping mechanism receives the part workpiece through a swing arm and realizes a stepping action through the transmitted power; the adjustment component includes a linear guide rail slider mechanism, a bearing mechanism and a screw nut mechanism; the linear guide rail slider mechanism is arranged at the bottom of the stepping component and is movably connected with the lower part of the frame; the bearing mechanism is installed at the lower part of the frame and is connected with the screw nut mechanism; the screw nut mechanism is installed outside the driving shaft.

[0005] Further, the frame includes universal adjusting feet, a base material frame, and a mounting frame; the universal adjusting feet are installed at the bottom of the base material frame; a reduction motor is installed inside the base material frame; the mounting frame is arranged on the base material frame, and a stepping component and an adjusting component are installed on the mounting frame.

[0006] Furthermore, in the stepping component, the driving sprocket chain mechanism includes a first driving sprocket, a driving chain, and a second driving sprocket; the first driving sprocket is key-connected to the reduction motor, the second driving sprocket is key-connected to the driving shaft, and the driving chain connects the first driving sprocket and the second driving sprocket; the driven sprocket chain mechanism includes a first driven sprocket, a driven chain, and a second driven sprocket, the first driven sprocket is key-connected to the driving shaft, the driven chain connects the first driven sprocket and the second driven sprocket, and the second driven sprocket is key-connected to the driven shaft mechanism.

[0007] Furthermore, in the stepping component, the driven shaft mechanism includes a first pedestal bearing, a first driven shaft, a second driven shaft, and a shrink disc; the swing arm stepping mechanism includes a swing arm, a deep groove ball bearing, a swing arm, and a stepping support block; the first pedestal bearing is installed on the mounting frame, and the first pedestal bearing supports the driving shaft, the first driven shaft, and the second driven shaft; the first driven shaft is key-connected to the second driven sprocket; the first driven shaft and the second driven shaft are connected by a swing arm; the shrink disc fixes the first driven shaft and the swing arm; the deep groove ball bearing is installed in the swing arm by a circlip for position-limiting; the second driven shaft is connected to the deep groove ball bearing in the swing arm, and a stepping support block is arranged at the end of the swing arm.

[0008] Furthermore, the utility model further includes a detection mechanism, the detection mechanism includes a detection block and a detection switch, the detection block is installed on the driving sprocket, the detection switch is installed on the base material frame, after the detection switch detects the detection block, it transmits a signal to the electric control system, and the electric control system is used to control the start and stop of the reduction motor.

[0009] Furthermore, in the stepping component, the material supporting mechanism includes a material supporting frame and V-shaped blocks; the material supporting frame is installed on the mounting frame, and the V-shaped blocks are movably installed on the top of the mounting frame for placing part workpieces.

[0010] Furthermore, an alignment guiding mechanism is arranged on the fixed side, the alignment guiding mechanism includes an alignment strip, a guiding rod, and a locking block; one side of the alignment strip is flush with one end of the part workpiece, the other side of the alignment strip is fixedly connected to one end of the guiding rod, the guiding rod is arranged on the mounting arm of the mounting frame, and the locking block is arranged on the guiding rod.

[0011] Further, in the adjustment assembly, the linear guide slider mechanism includes a linear guide and a slider. The linear guide is installed on the base material rack, the bottom of the slider is slidably connected to the linear guide, and the top of the slider is fixedly connected to the bottom of the stepping assembly; the bearing mechanism includes a bearing mounting seat and a second bearing with a seat; the lead screw nut mechanism includes a trapezoidal lead screw, a trapezoidal nut, a handwheel, and a guide key; the bearing mounting seat is installed on the base material rack, the second bearing with a seat is installed on the bearing mounting seat and connected to the trapezoidal lead screw; the trapezoidal nut is installed on the mounting frame and cooperates with the trapezoidal lead screw; the handwheel is connected to the trapezoidal lead screw and drives the trapezoidal lead screw to rotate; the middle of the guide key cooperates with the trapezoidal lead screw, the outer side of the guide key is installed on the first driven sprocket, and the inner side of the guide key cooperates with the outer side of the driving shaft.

[0012] Further, the adjustment assembly further includes an adjustment sprocket chain mechanism, which includes an adjustment sprocket and an adjustment chain. The adjustment sprocket is key-connected to the trapezoidal lead screw, and the adjustment chain connects the adjustment sprockets on both sides of the device.

[0013] Further, a first tensioning wheel is provided in the driven sprocket chain mechanism, and the first tensioning wheel is used to tension the driven chain; a protective cover is provided on the outer side of the driven chain; a second tensioning wheel is provided in the adjustment sprocket chain mechanism, and the second tensioning wheel is used to tension the adjustment chain.

[0014] Compared with the prior art, the stepping forward assembly of the device is divided into a fixed side and a moving side. One set of stepping assemblies is fixed on the frame to form the fixed side, and the other set of stepping assemblies is connected to the adjustment assembly to form the moving side; the stepping assembly uses a reduction motor to drive the sprocket chain to drive the rotation of the driving shaft and the driven shaft mechanism, and the driven shaft mechanism forms a crankshaft, so that the swing arm of the connected swing arm stepping mechanism rotates in a circular manner through the transmitted power, realizing the stepping action of the received part workpiece. The fixed side and the moving side of the device are integrated by the driving shaft, and the rotation of the driving shaft drives the synchronous action of the swing arms on both sides, making the stepping action more stable; the adjustment assembly moves the stepping assembly on the linear guide slider mechanism through the lead screw nut mechanism, realizing the adjustment of the position of the stepping assembly, so that the two sets of stepping assemblies of the device can place shaft-like or rack-like part workpieces of different lengths; in addition, by replacing the detachable fixed stock support mechanism on the device, the device can be applicable to shaft-like or rack-like part workpieces of different diameters. The device of the present invention has a simple structure and stable operation, can be applicable to different varieties of shaft-like or rack-like part workpieces, making the docking process of production time-saving and labor-saving, greatly improving the production efficiency and reducing the production cost. Description of the Drawings

[0015] Figure 1 Isometric side view of the present invention.

[0016] Figure 2 This is the top view of the utility model.

[0017] Figure 3 This is the rear view of the utility model.

[0018] Figure 4 This is the sectional view of the left view of the utility model.

[0019] Figure 5 This is the explanatory diagram of the fixed side and the adjustment side of the utility model.

[0020] Figure 6 is Figure 4 the partial view I on the left side of

[0021] Figure 7 is Figure 4 the partial view II on the left side of

[0022] Figure 8 is Figure 4 the partial view I on the right side of

[0023] Figure 9 is Figure 4 the partial view II on the right side of

[0024] Explanation of reference numerals: B - Stepping component; T - Adjusting component; Y - Moving side; G - Fixed side; 1 - Universal adjusting foot; 2 - Base material rack; 3 - Mounting rack; 4 - Material supporting rack; 5 - V - block; 6 - Reducing motor; 7 - First driving sprocket; 8 - Driving chain; 9 - Detection block; 10 - Detection switch; 11 - Driving shaft; 12 - Second driving sprocket; 13 - First driven sprocket; 14 - Driven chain; 15 - First pedestal bearing; 16 - First driven shaft; 17 - Second driven sprocket; 18 - Rotating arm; 19 - Second driven shaft; 20 - Expansion sleeve; 21 - Deep groove ball bearing; 22 - Swing arm; 23 - Alignment strip; 24 - Guide rod; 25 - Locking block; 26 - Protective cover; 27 - First tensioning wheel; 28 - Trapezoidal lead screw; 29 - Trapezoidal nut; 30 - Hand wheel; 31 - Bearing mounting seat; 32 - Second pedestal bearing; 33 - Adjusting sprocket; 34 - Chain; 35 - Guide key; 36 - Linear guide rail; 37 - Second tensioning wheel; 38 - Stepping support block; 39 - Slide block; 40 - Part workpiece. Detailed implementation manners

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer and more understandable, the following further details this application in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0026] An adjustable chain - type crankshaft stepping device, as Figures 1 to 5As shown, the whole is composed of a frame, a reduction motor 6, and two sets of stepping forward components symmetrically arranged along the reduction motor 6. The number of sets of the stepping forward components is at least two, and can also be multiple sets, which can be set according to specific requirements. For example Figures 1 to 5 As shown, the reduction motor 6 is installed at the lower part of the frame. For example Figure 1 As shown, the frame is composed of universal adjusting feet 1, a bottom material frame 2, and a mounting frame 3. The universal adjusting feet 1 are installed at the bottom of the bottom material frame 2, and the mounting frame 3 is arranged on the bottom material frame 2; more specifically, both the bottom material frame 2 and the mounting frame 3 can be assembled with aluminum profiles. The bottom material frame 2 is a square table structure, and the mounting frame 3 is composed of two sets of square frame structures. The two sets of square frame structures are symmetrically fixed on the square table structure along the length direction of the square table structure. The reduction motor 6 is installed inside the bottom material frame 2; the stepping component B and the adjusting component T are installed on the mounting frame 3.

[0027] For example Figure 4 and Figure 5 As shown, the stepping forward component is composed of the stepping component B and the adjusting component T. Among them, there are two sets of the stepping component B. One set of the stepping component B is fixed on the frame to form a fixed side G, and the other set of the stepping component B is connected to the adjusting component T to form a moving side Y.

[0028] For example Figure 6 and Figure 7 As shown, the whole of the stepping component B is composed of a material supporting mechanism, a driving sprocket chain mechanism, a driving shaft 11, a driven sprocket chain mechanism, a driven shaft mechanism, and a swing arm stepping mechanism. Generally speaking, the material supporting mechanism is detachably installed on the frame and is used to place the part workpiece 40; the driving sprocket chain mechanism is connected to the reduction motor 6 and transmits power to the driving shaft 11; the driven sprocket chain mechanism connects the driving shaft 11 and the driven shaft mechanism and transmits power to the driven shaft mechanism; the driven shaft mechanism forms a crankshaft, and the driven shaft mechanism is connected to the swing arm stepping mechanism; the swing arm stepping mechanism receives the part workpiece 40 through the swing arm and realizes the stepping action through the transmitted power.

[0029] The specific structure of the stepping component B is as shown in Figure 6 and Figure 7As shown in the figure, the stock supporting mechanism is composed of a stock support 4 and a V-block 5; the stock support 4 is installed on the mounting bracket 3, and the V-block 5 is movably installed on the top of the mounting bracket 3 for placing the part workpiece 40. The driving sprocket chain mechanism is composed of a first driving sprocket 7, a driving chain 8 and a second driving sprocket 12; the first driving sprocket 7 is key-connected to the reduction motor 6, the second driving sprocket 12 is key-connected to the driving shaft 11, and the driving chain 8 connects the first driving sprocket 7 and the second driving sprocket 12. The driven sprocket chain mechanism is composed of a first driven sprocket 13, a driven chain 14 and a second driven sprocket 17. The first driven sprocket 13 is key-connected to the driving shaft 11, the driven chain 14 connects the first driven sprocket 13 and the second driven sprocket 17, and the second driven sprocket 17 is key-connected to the driven shaft mechanism. The driven shaft mechanism is composed of a first pedestal bearing 15, a first driven shaft 16, a second driven shaft 19 and a shrink disc 20; the swing arm stepping mechanism is composed of a swing arm 18, a deep groove ball bearing 21, a swing arm 22 and a stepping support block 38; the first pedestal bearing 15 is installed on the mounting bracket 3, and the first pedestal bearing 15 supports the driving shaft 11, the first driven shaft 16 and the second driven shaft 19; the first driven shaft 16 is key-connected to the second driven sprocket 17; the first driven shaft 16 and the second driven shaft 19 are connected by the swing arm 18; the shrink disc 20 fixes the first driven shaft 16 and the swing arm 18; the deep groove ball bearing 21 is installed in the swing arm 22 with a snap ring for position limitation; the second driven shaft 19 is connected to the deep groove ball bearing 21 in the swing arm 22, and the end of the swing arm 22 is provided with a stepping support block 38.

[0030] As Figure 3 shown, a first tensioning wheel 27 is arranged in the driven sprocket chain mechanism, and the first tensioning wheel 27 is used to tension the driven chain 14; a protective cover 26 is arranged on the outer side of the driven chain 14 to prevent people from being injured when the chain rotates.

[0031] As Figure 6 shown, the device is also provided with a detection mechanism, which is composed of a detection block 9 and a detection switch 10. The detection block 9 is installed on the first driving sprocket 7, and the detection switch 10 is installed on the bottom stock rack 2. After the detection switch 10 detects the detection block 9, it transmits a signal to the electric control system, and the electric control system is used to control the start and stop of the reduction motor 6. Specifically, when the detection block 9 installed on the first driving sprocket 7 rotates one circle, it is detected by the detection switch 10, thereby controlling the reduction motor 6 to stop and completing the stepping action.

[0032] As Figure 7 shown, an alignment guiding mechanism is also arranged on the fixed side. The alignment guiding mechanism is composed of an alignment strip 23, a guiding rod 24 and a locking block 25; one side of the alignment strip 23 is flush with one end of the part workpiece 40, the other side of the alignment strip 23 is fixedly connected to one end of the guiding rod 24, the guiding rod 24 is arranged on the mounting arm of the mounting bracket 3, and the locking block 25 is arranged on the guiding rod 24.

[0033] Thus, the stepping component B uses a reduction motor 6 to drive a sprocket chain, driving the rotation of the driving shaft 11 and the driven shaft mechanism. The first driven shaft 16 and the second driven shaft 19 form a crankshaft. When the reduction motor 6 rotates one circle, it takes one step, and the stepping distance is the center distance between the first driven shaft 16 and the second driven shaft 19.

[0034] As Figure 1 and Figure 2 shown, in order to achieve the stepping movement of multiple shaft-like or rack-like part workpieces at one time, the material supporting frame 4 is strip-shaped and is arranged between the left and right groups of stepping forward components. Multiple V-shaped blocks 5 for placing shaft-like or rack-like parts are arranged on the strip-shaped material supporting frame 4. The distance between the V-shaped blocks 5 is the stepping distance, that is, the center distance between the first driven shaft 16 and the second driven shaft 19. At the same time, strip-shaped stepping support blocks 38 are arranged at the ends of the swing arms 22 of the left and right groups of stepping forward components. Multiple support positions for shaft-like or rack-like parts are arranged on the stepping support blocks 38, and the number of support positions is the same as the number of V-shaped blocks 5. In addition, the alignment strip 23 of the alignment guiding mechanism can be arranged between the left and right groups of stepping forward components to align multiple shaft-like or rack-like parts at one time.

[0035] As Figure 8 and Figure 9 shown, the adjusting component T includes a linear guide rail slider mechanism, a bearing mechanism, and a lead screw nut mechanism. The linear guide rail slider mechanism is arranged at the bottom of the stepping component B and is movably connected to the lower part of the machine frame. The bearing mechanism is installed on the lower part of the machine frame and is connected to the lead screw nut mechanism. The lead screw nut mechanism is installed outside the driving shaft 11.

[0036] The specific structure of the adjusting component T is as Figure 8 and Figure 9 shown. The linear guide rail slider mechanism is composed of a linear guide rail 36 and a slider 39. The linear guide rail 36 is installed on the bottom material frame 2, the bottom of the slider 39 is slidably connected to the linear guide rail 36, and the top of the slider 39 is fixedly connected to the bottom of the stepping component B. The bearing mechanism is composed of a bearing mounting seat 31 and a second bearing with a seat 32. The lead screw nut mechanism is composed of a trapezoidal lead screw 28, a trapezoidal nut 29, a handwheel 30, and a guide key 35. The bearing mounting seat 31 is installed on the bottom material frame 2, the second bearing with a seat 32 is installed on the bearing mounting seat 31 and is connected to the trapezoidal lead screw 28. The trapezoidal nut 29 is installed on the mounting frame 3 and is matched with the trapezoidal lead screw 28. The handwheel 30 is connected to the trapezoidal lead screw 28 and drives the trapezoidal lead screw 28 to rotate. The middle part of the guide key 35 is matched with the trapezoidal lead screw 28. The outside of the guide key 35 is installed on the first driven sprocket 13, and the inside of the guide key 35 is matched with the outside of the driving shaft 11. A guide groove matched with the guide key 35 can be arranged on the driving shaft 11 to facilitate the movement of the guide key 35 more conveniently.

[0037] As Figure 2 andFigure 8 As shown, an adjusting sprocket and chain mechanism is further provided on the adjusting component T. The adjusting sprocket and chain mechanism consists of an adjusting sprocket 33 and an adjusting chain 34. The adjusting sprocket 33 is key-connected to the trapezoidal lead screw 28. The adjusting chain 34 connects the adjusting sprockets 33 on both sides of the device, that is, the adjusting chain 34 connects the left and right groups of step-forward components, so that the adjusting sprockets 33 on the trapezoidal lead screw 28 drive each other through the adjusting chain 3. Only by rotating one end of the handwheel 30 can the two trapezoidal lead screws 28 be driven to act synchronously.

[0038] As Figure 2 shown, a second tension wheel 37 is provided in the adjusting sprocket and chain mechanism, and the second tension wheel 37 is used to tension the adjusting chain 34.

[0039] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An adjustable chain crankshaft stepping device, characterized in that: It comprises a frame, a reduction motor (6), and at least two groups of step-forward components symmetrically arranged along the reduction motor (6); The reduction motor (6) is installed at the lower part of the frame; The step-forward assembly comprises a step assembly (B) and an adjusting assembly (T); the step assembly (B) is divided into two groups, one group of the step assembly (B) is fixed on the frame to form a fixed side (G), and the other group of the step assembly (B) is connected to the adjusting assembly (T) to form a moving side (Y); The stepping assembly (B) comprises a supporting mechanism, a driving sprocket chain mechanism, a driving shaft (11), a driven sprocket chain mechanism, a driven shaft mechanism, and a swing arm stepping mechanism; the supporting mechanism is detachably mounted on a frame and is used to place a part workpiece (40); the driving sprocket chain mechanism is connected to a reduction motor (6) and transmits power to the driving shaft (11); the driven sprocket chain mechanism connects the driving shaft (11) and the driven shaft mechanism and transmits power to the driven shaft mechanism; the driven shaft mechanism forms a crankshaft, and the crankshaft is connected to a swing arm stepping mechanism; the swing arm stepping mechanism receives the part workpiece (40) through a swing arm and realizes a stepping action through the transmitted power; The adjustment assembly (T) comprises a linear guide slider mechanism, a bearing mechanism, and a screw nut mechanism; the linear guide slider mechanism is arranged at the bottom of the stepping assembly (B) and is movably connected to the lower part of the frame; the bearing mechanism is installed at the lower part of the frame and connected to the screw nut mechanism; the screw nut mechanism is installed on the outside of the driving shaft (11).

2. An adjustable chain crankshaft stepping device according to claim 1, characterized in that: The frame comprises a universal adjustment foot (1), a bottom material frame (2) and a mounting frame (3); the universal adjustment foot (1) is mounted on the bottom of the bottom material frame (2); a reduction motor (6) is mounted inside the bottom material frame (2); the mounting frame (3) is arranged on the bottom material frame (2), and a stepping assembly (B) and an adjustment assembly (T) are mounted on the mounting frame (3).

3. An adjustable chain crankshaft stepping device according to claim 2, characterized in that: In the stepping assembly (B), the driving sprocket chain mechanism comprises a first driving sprocket (7), a driving chain (8) and a second driving sprocket (12); the first driving sprocket (7) is key-connected to the reduction motor (6), the second driving sprocket (12) is key-connected to the driving shaft (11), and the driving chain (8) connects the first driving sprocket (7) and the second driving sprocket (12); The driven sprocket chain mechanism comprises a first driven sprocket (13), a driven chain (14) and a second driven sprocket (17); the first driven sprocket (13) is key-connected to the driving shaft (11); the driven chain (14) connects the first driven sprocket (13) and the second driven sprocket (17); and the second driven sprocket (17) is key-connected to the driven shaft mechanism.

4. An adjustable chain crankshaft stepping device according to claim 3, characterized in that: In the stepping assembly (B), the driven shaft mechanism comprises a first seat bearing (15), a first driven shaft (16), a second driven shaft (19), and a tightening sleeve (20); the swing arm stepping mechanism comprises a rotating arm (18), a deep groove ball bearing (21), a swing arm (22), and a stepping support block (38); The first seat bearing (15) is mounted on the mounting frame (3), and the first seat bearing (15) supports the driving shaft (11), the first driven shaft (16) and the second driven shaft (19); the first driven shaft (16) is key-connected with the second driven sprocket (17); the first driven shaft (16) and the second driven shaft (19) are connected via a swing arm (18); the expansion sleeve (20) fixes the first driven shaft (16) and the swing arm (18); the deep groove ball bearing (21) is installed in the swing arm (22) by means of a retaining spring; the second driven shaft (19) is connected to the deep groove ball bearing (21) in the swing arm (22), and a stepping support block (38) is provided at the end of the swing arm (22).

5. The adjustable chain crankshaft stepping device according to claim 3, characterized in that: The invention also comprises a detection mechanism, wherein the detection mechanism comprises a detection block (9) and a detection switch (10), wherein the detection block (9) is mounted on the driving sprocket (7), and the detection switch (10) is mounted on the bottom material frame (2), and after the detection switch (10) detects the detection block (9), it transmits a signal to an electric control system, and the electric control system is used to control the start and stop of the reduction motor (6).

6. The adjustable chain crankshaft stepping device according to claim 2, characterized in that: In the stepping assembly (B), the supporting mechanism comprises a supporting frame (4) and a V-shaped block (5); the supporting frame (4) is mounted on a mounting frame (3), and the V-shaped block (5) is movably mounted on the top of the mounting frame (3) for placing a part workpiece (40).

7. The adjustable chain crankshaft stepping device according to claim 2, characterized in that: An alignment guide mechanism is arranged on the fixed side, and the alignment guide mechanism comprises an alignment bar (23), a guide rod (24) and a locking block (25); one side of the alignment bar (23) is flush with one end of the workpiece (40), and the other side of the alignment bar (23) is fixedly connected to one end of the guide rod (24); the guide rod (24) is arranged on a mounting arm of the mounting frame (3), and the locking block (25) is arranged on the guide rod (24).

8. An adjustable chain crankshaft stepping device according to any one of claims 2 to 7, characterized in that: In the adjustment component (T), the linear guide slider mechanism comprises a linear guide (36) and a slider (39), the linear guide (36) is installed on the bottom material frame (2), the bottom of the slider (39) is slidably connected to the linear guide (36), and the top of the slider (39) is fixedly connected to the bottom of the stepping component (B); The bearing mechanism comprises a bearing mounting seat (31) and a second bearing with a seat (32); the screw nut mechanism comprises a trapezoidal screw (28), a trapezoidal nut (29), a hand wheel (30) and a guide key (35); the bearing mounting seat (31) is mounted on the base frame (2), the second bearing with a seat (32) is mounted on the bearing mounting seat (31) and connected to the trapezoidal screw (28); the trapezoidal nut (29) is mounted on the mounting frame (3) and matches with the trapezoidal screw (28); the hand wheel (30) is connected with the trapezoidal screw (28) and drives the trapezoidal screw (28) to rotate; the middle part of the guide key (35) matches with the trapezoidal screw (28), the outer side of the guide key (35) is mounted on the first driven sprocket (13), and the inner side of the guide key (35) matches with the outer side of the driving shaft (11).

9. An adjustable chain crankshaft stepping device according to claim 8, characterized in that: The adjusting assembly (T) further comprises an adjusting sprocket chain mechanism, wherein the adjusting sprocket chain mechanism comprises an adjusting sprocket (33) and an adjusting chain (34), wherein the adjusting sprocket (33) is key-connected to the ladder screw (28), and the adjusting chain (34) connects the adjusting sprockets (33) on the left and right sides of the device.

10. An adjustable chain crankshaft stepping device according to claim 9, characterized in that: The driven sprocket chain mechanism is provided with a first tensioning wheel (27), and the first tensioning wheel (27) is used to tighten the driven chain (14); a protective cover (26) is provided on the outer side of the driven chain (14); and the adjusting sprocket chain mechanism is provided with a second tensioning wheel (37), and the second tensioning wheel (37) is used to tighten the adjusting chain (34).

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