Positioning device for large crankshaft horizontal machine tool processing

Abstract

The present invention belongs to the technical field of horizontal machine tools, and specifically is a positioning device for machining large crankshaft horizontal machine tools, comprising a base plate, a first rotating assembly is fixedly connected to one side of the upper surface of the base plate, a moving assembly is fixedly connected to one side of the base plate, a second rotating assembly is fixedly connected to the upper surface of the moving assembly, and a clamping assembly is fixedly connected to the inside of the first rotating assembly and the second rotating assembly; by means of the provided clamping assembly and the stabilizing assembly, a main journal at one end of the crankshaft assembly is placed in the middle of two arc plates, a hydraulic rod is started, and the arc plate is pushed toward the main journal, so that crankshaft assemblies of different thicknesses can be clamped and fixed, and a contact ball first contacts the main journal, and a first spring is squeezed by a push rod, and then a bolt is used to pass through the two arc plates, and a nut thread is rotated to the outer surface of the bolt for connection and fixing, and the stability of the arc plate clamping it is improved by the rebound force of the first spring.

Description

Technical Field

[0001] The invention belongs to the technical field of horizontal machine tools, in particular to a positioning device for machining large-scale horizontal crankshaft machine tools. Background Art

[0002] Large crankshaft is an important engine component, mainly used to transmit the torque and rotational force of the engine. It is usually composed of multiple journals and spindles. The journal is used to support the bearings, while the spindle is connected to other parts of the engine, such as the piston and flywheel. Large crankshaft horizontal machine tools are heavy-duty machine tools specially used for processing large crankshafts. They usually have a huge body and a solid foundation to withstand the weight of heavy workpieces and the huge cutting force generated during processing. Its horizontal layout makes the clamping and processing of workpieces more convenient, and operators can load, unload and adjust workpieces more easily. Large crankshaft horizontal machine tools play an important role in multiple industries. In the automotive industry, they are used to produce and repair engine crankshafts to ensure the performance and reliability of the engine. In shipbuilding, these machine tools are used to process large marine crankshafts to meet the needs of ship power systems. In the aviation field, high-precision processing of crankshafts is crucial to the safety of aircraft engines. As a heavy-duty machine tool specially used for processing large crankshafts, large crankshaft horizontal machine tools have become an indispensable and important equipment in modern manufacturing with their solid structure, high-precision processing capabilities and wide application fields.

[0003] The use of positioning devices is crucial in the horizontal machine tool processing of large crankshafts. The primary function of the positioning device is to ensure the accurate positioning of the workpiece during the processing. For large crankshafts, their shapes are complex and their sizes are large. Any slight positioning error may lead to a decrease in processing accuracy. By using high-precision positioning devices such as fixtures, locating pins and reference surfaces, the crankshaft can be effectively fixed on the machine tool to ensure that it does not move during the processing, thereby improving the processing accuracy.

[0004] However, the design of crankshafts usually involves a variety of curves and irregular shapes, which requires extremely high precision during processing. Even a small processing error may cause the crankshaft to be unbalanced during operation, thus affecting the overall performance and life of the engine. For large crankshafts, they are not only heavy but also irregular in shape, which brings additional difficulties to fixation and processing. Traditional fixing devices may not provide sufficient support, resulting in displacement or deformation of the workpiece during processing. In addition, when fixing the crankshaft, it is a common practice to manually determine the fixing center. However, this method has certain limitations. Manual operation is easily affected by subjective factors, resulting in deviations from the fixing center. Even a small deviation may cause huge vibrations during processing, thereby affecting the processing accuracy. At the same time, for crankshafts of different sizes, traditional fixing methods usually rely on manual adjustment. This method is not only inefficient, but also prone to operational errors when processing crankshafts of various specifications, resulting in unstable processing quality. The manual adjustment process is cumbersome and time-consuming, which seriously affects production efficiency.

[0005] To this end, the present invention provides a positioning device for machining large crankshafts in a horizontal machine tool. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: the positioning device for large crankshaft horizontal machine tool processing described in the present invention comprises a base plate, a first rotating component is fixedly connected to one side of the upper surface of the base plate, a moving component is fixedly connected to one side of the base plate, a second rotating component is fixedly connected to the upper surface of the moving component, the first rotating component and the second rotating component are both fixedly connected to the inside of a clamping component, a limiting groove is provided on the inner side of the clamping component, a stabilizing component is fixedly connected to the inside of the limiting groove, a crankshaft component is clamped to the inner side of the stabilizing component, the first rotating component and the second rotating component are both fixedly connected to the inside of a first damping component, a protective component is fixedly connected to the lower surface of the base plate, and a second damping component is fixedly connected to the inside of the protective component; The clamping assembly includes a hydraulic rod, one end of which is fixedly connected to the inside of the first rotating assembly or the second rotating assembly, and the other end of the hydraulic rod is fixedly connected to an arc-shaped plate, both sides of the outer surface of the arc-shaped plate are threadedly connected to bolts, and the outer surface of the bolt is threadedly connected to a nut; The stabilizing component comprises a first spring, one end of which is fixedly connected to the inner wall of the limiting groove, the other end of which is fixedly connected to a push rod, and one end of which is fixedly connected to a contact ball.

[0008] The first rotating assembly includes a first vertical plate, the lower surface of the first vertical plate is fixedly connected to one side of the upper surface of the base plate, a stepper motor is fixedly installed on one side of the first vertical plate, the output end of the stepper motor is fixedly connected to a first connecting ring, one end of the first connecting ring is fixedly connected to a first rotating ring, and the outer surface of the first rotating ring is rotatably connected to a first supporting ring.

[0009] The moving assembly comprises a driving motor, one side of which is fixedly mounted on one side of the base plate, an output end of the driving motor is fixedly connected to a threaded rod, and an outer surface of the threaded rod is threadedly connected to a connecting block.

[0010] The second rotating assembly includes a second vertical plate, the lower surface of the second vertical plate is fixedly connected to one side of the upper surface of the connecting block, a through groove is opened on one side of the second vertical plate, a second connecting ring is rotatably connected inside the through groove, one end of the second connecting ring is fixedly connected to the second rotating ring, and the outer surface of the second rotating ring is rotatably connected to the second support ring.

[0011] The crankshaft assembly comprises a main journal, the outer surface of which is clamped to the inner side of the contact ball, one side of the main journal is fixedly connected to a crank, and one side of the crank is fixedly connected to a connecting rod journal.

[0012] The first shock-absorbing component includes a connecting rod, one side of which is fixedly connected to the inner side of the first support ring, the upper surface of the connecting rod is fixedly connected to the first damping telescopic rod, the top of the first damping telescopic rod is fixedly connected to a strap, and the upper surface of the connecting rod is fixedly connected to a second spring located at the periphery of the first damping telescopic rod.

[0013] The protection component comprises an inner shell, the upper surface of the inner shell is fixedly connected to the lower surface of the bottom plate, the outer surface of the inner shell is fixedly connected to a limiting block, and the outer surface of the limiting block is slidably connected to an outer shell.

[0014] The second shock-absorbing assembly includes a first shock-absorbing pad, the upper surface of which is fixedly connected to the inner top wall of the inner shell, the lower surface of which is fixedly connected to a second damping telescopic rod, the bottom end of the second damping telescopic rod is fixedly connected to a second shock-absorbing pad, and the upper surface of the second shock-absorbing pad is located on the periphery of the second damping telescopic rod and is fixedly connected to a third spring.

[0015] Both sides of the lower surface of the second rotating assembly are fixedly connected with fixed blocks, and the interior of the fixed blocks is slidably connected with a limit rod.

[0016] A sliding groove is provided on the other side of the upper surface of the bottom plate. The number of the sliding grooves is three, wherein the sliding grooves on both sides are matched with the fixing blocks, and the sliding groove in the middle is matched with the connecting block.

[0017] The beneficial effects of the present invention are as follows: 1. The positioning device for large-scale crankshaft horizontal machine tool processing described in the present invention has two arc plates through the provided clamping assembly and the stabilizing assembly. The main journal at one end of the crankshaft assembly is placed in the middle of the two arc plates, and the hydraulic rod is started to push the arc plate closer to the main journal, so that crankshaft assemblies of different thicknesses can be clamped and fixed, and the contact ball first contacts the main journal, and the first spring is squeezed by the push rod, and then a bolt is used to pass through the two arc plates, and the nut thread is rotated to the outer surface of the bolt for connection and fixing. The rebound force of the first spring improves the stability of the arc plate clamping it, ensuring that the crankshaft assembly can be firmly fixed during the processing and reducing vibration. The force points are dispersed by the contact ball, which further ensures the stability of the clamping. At the same time, because the hydraulic rods on both sides are moved to the middle at the same time for fixing, it is convenient to ensure that the clamping point is in the center position, which can avoid vibration caused by unbalanced clamping, thereby affecting the processing accuracy.

[0018] 2. The positioning device for large crankshaft horizontal machine tool processing described in the present invention, through the set moving component, the external power supply starts the driving motor, drives the threaded rod to rotate, and the connecting block then slides on the outer surface of the threaded rod, which can drive the second rotating component to move, thereby adjusting the distance between the first rotating component and the second rotating component, which is convenient for fixing crankshaft assemblies of different lengths, and does not require workers to manually adjust it, which is convenient for stabilizing the processing quality and is easy to operate, avoiding affecting production efficiency and ensuring operational safety.

[0019] 3. The positioning device for large crankshaft horizontal machine tool processing described in the present invention has a first shock-absorbing component, a butt plate in contact with the second main journal at one end of the crankshaft assembly, and a second spring pushes the butt plate. Combined with the first damping telescopic rod, during the processing of the crankshaft assembly, the device can buffer and release the vibration generated by it, thereby reducing the impact on the workpiece.

[0020] 4. The positioning device for large crankshaft horizontal machine tool processing described in the present invention has a protective component and a second shock-absorbing component. Under the limitation of the limit block, the inner shell moves up and down inside the outer shell to protect the outer surface of the second shock-absorbing component. At the same time, the first shock-absorbing pad and the second shock-absorbing pad absorb the vibration generated during the processing, and the second damping telescopic rod and the third spring release the vibration, thereby reducing the noise generated during the processing and avoiding affecting the production environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 is a stereogram of the present invention; Figure 2 is a schematic structural diagram of the first rotating assembly in the present invention; Figure 3 It is a structural schematic diagram of the mobile component in the present invention; Figure 4 is a schematic structural diagram of the second rotating assembly in the present invention; Figure 5 It is a structural schematic diagram of the clamping assembly in the present invention; Figure 6 It is a structural schematic diagram of the crankshaft assembly in the present invention; Figure 7 It is a structural schematic diagram of the first shock absorbing component in the present invention; Figure 8 is a schematic structural diagram of the second shock absorbing component in the present invention; Fig. 9 The present invention Figure 5 Schematic diagram of the structure at point A in the middle.

[0023] In the figure: 1, bottom plate; 2, hydraulic rod; 3, arc plate; 4, bolt; 5, nut; 6, first spring; 7, push rod; 8, contact ball; 9, first vertical plate; 10, stepping motor; 11, first connecting ring; 12, first rotating ring; 13, first supporting ring; 14, driving motor; 15, threaded rod; 16, connecting block; 17, second vertical plate; 18, second connecting ring; 19, second rotating ring; 20, second supporting ring; 21, main journal; 22, crank; 23, connecting rod journal; 24, connecting rod; 25, first damping telescopic rod; 26, strap; 27, second spring; 28, inner shell; 29, limit block; 30, outer shell; 31, first shock-absorbing pad; 32, second damping telescopic rod; 33, second shock-absorbing pad; 34, third spring; 35, fixing block; 36, limit rod. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0025] Embodiment 1: Figures 1 to 9 As shown, the embodiment of the present invention is as follows: It includes a base plate 1, a first rotating assembly is fixedly connected to one side of the upper surface of the base plate 1, a moving assembly is fixedly connected to one side of the base plate 1, a second rotating assembly is fixedly connected to the upper surface of the moving assembly, the first rotating assembly and the second rotating assembly are both fixedly connected to the inside of the clamping assembly, a limiting groove is provided on the inner side of the clamping assembly, a stabilizing assembly is fixedly connected to the inside of the limiting groove, a crankshaft assembly is clamped to the inner side of the stabilizing assembly, the first rotating assembly and the second rotating assembly are both fixedly connected to the inner sides of the first damping assembly, a protective assembly is fixedly connected to the lower surface of the base plate 1, and the second damping assembly is fixedly connected to the inside of the protective assembly; The clamping assembly includes a hydraulic rod 2, one end of which is fixedly connected to the inside of the first rotating assembly or the second rotating assembly, and the other end of the hydraulic rod 2 is fixedly connected to an arc plate 3, both sides of the outer surface of the arc plate 3 are threadedly connected to bolts 4, and the outer surface of the bolt 4 is threadedly connected to a nut 5; The stabilizing component includes a first spring 6, one end of which is fixedly connected to the inner wall of the limiting groove, the other end of the first spring 6 is fixedly connected to a push rod 7, one end of the push rod 7 is fixedly connected to a contact ball 8, there are two arc plates 3, the main journal 21 at one end of the crankshaft assembly is placed in the middle of the two arc plates 3, the hydraulic rod 2 is started, and the arc plate 3 is pushed close to the main journal 21, and the crankshaft assemblies of different thicknesses can be clamped and fixed, and the contact ball 8 first contacts the main journal 21, and the first spring 6 is squeezed by the push rod 7, and then the contact ball 8 is pressed. The bolt 4 is passed through the two arc plates 3, and the nut 5 is threadedly rotated to the outer surface of the bolt 4 for connection and fixation. The rebound force of the first spring 6 improves the stability of the arc plate 3 clamping it, ensuring that the crankshaft assembly can be firmly fixed during the processing and reduce vibration. The force points are dispersed by the contact ball 8 to further ensure the stability of the clamping. At the same time, since the hydraulic rods 2 on both sides are moved to the middle at the same time for fixation, it is convenient to ensure that the clamping point is in the center position, which can avoid vibration caused by unbalanced clamping, thereby affecting the processing accuracy.

[0026] The first rotating assembly includes a first vertical plate 9, the lower surface of the first vertical plate 9 is fixedly connected to one side of the upper surface of the base plate 1, a stepper motor 10 is fixedly installed on one side of the first vertical plate 9, the output end of the stepper motor 10 is fixedly connected to a first connecting ring 11, one end of the first connecting ring 11 is fixedly connected to a first rotating ring 12, the outer surface of the first rotating ring 12 is rotatably connected to a first supporting ring 13, after the crankshaft assembly is fixed by the clamping assembly, the external power supply starts the stepper motor 10, thereby rotating the first connecting ring 11, and the first rotating ring 12 follows the rotation under the limiting action of the first rotating ring 12, thereby conveniently driving the crankshaft assembly to rotate, so that the device is convenient for processing multiple surfaces of the crankshaft assembly, and it is convenient to achieve higher processing accuracy and ensure that the tool can cut at the optimal angle.

[0027] The moving component includes a driving motor 14, one side of which is fixedly mounted on one side of the base plate 1, an output end of the driving motor 14 is fixedly connected to a threaded rod 15, an outer surface of the threaded rod 15 is threadedly connected to a connecting block 16, an external power supply starts the driving motor 14, drives the threaded rod 15 to rotate, and the connecting block 16 then slides on the outer surface of the threaded rod 15, which can drive the second rotating component to move, thereby adjusting the distance between the first rotating component and the second rotating component, making it easy to fix crankshaft assemblies of different lengths, without the need for workers to manually adjust them, making it easy to stabilize the processing quality, and making the operation convenient, thus avoiding affecting the production efficiency and ensuring the safety of operation.

[0028] The second rotating assembly includes a second vertical plate 17, the lower surface of the second vertical plate 17 is fixedly connected to one side of the upper surface of the connecting block 16, a through groove is opened on one side of the second vertical plate 17, a second connecting ring 18 is rotatably connected inside the through groove, a second connecting ring 19 is fixedly connected to one end of the second connecting ring 18, a second supporting ring 20 is rotatably connected to the outer surface of the second supporting ring 20, and the lower surface of the second supporting ring 20 is fixedly connected to the other side of the upper surface of the connecting block 16. The second rotating assembly combined with the first rotating assembly can support the crankshaft assembly, so as to drive the crankshaft assembly to rotate conveniently.

[0029] Embodiment 2: Figures 1 to 9 As shown in Comparative Example 1, another embodiment of the present invention is: The crankshaft assembly includes a main journal 21, the outer surface of which is clamped to the inner side of the contact ball 8, a crank 22 is fixedly connected to one side of the main journal 21, and a connecting rod journal 23 is fixedly connected to one side of the crank 22. There are several main journals 21, cranks 22 and connecting rod journals 23, which are connected in sequence.

[0030] The first shock-absorbing assembly includes a connecting rod 24, one side of which is fixedly connected to the inner side of the first support ring 13, the upper surface of the connecting rod 24 is fixedly connected to a first damping telescopic rod 25, the top of the first damping telescopic rod 25 is fixedly connected to a strap 26, the upper surface of the connecting rod 24 is located at the periphery of the first damping telescopic rod 25 and is fixedly connected to a second spring 27, the strap 26 is in contact with the second main journal 21 at one end of the crankshaft assembly, the second spring 27 pushes the strap 26, and combined with the first damping telescopic rod 25, during the processing of the crankshaft assembly, the device can buffer and release the vibration generated by it, thereby reducing the impact on the workpiece.

[0031] The protective component includes an inner shell 28, the upper surface of the inner shell 28 is fixedly connected to the lower surface of the base plate 1, the outer surface of the inner shell 28 is fixedly connected to the limiting block 29, and the outer surface of the limiting block 29 is slidably connected to the outer shell 30. Under the limitation of the limiting block 29, the inner shell 28 moves up and down inside the outer shell 30 to protect the outer surface of the second shock absorbing component.

[0032] The second shock-absorbing assembly includes a first shock-absorbing pad 31, the upper surface of the first shock-absorbing pad 31 is fixedly connected to the inner top wall of the inner shell 28, the lower surface of the first shock-absorbing pad 31 is fixedly connected to the second damping telescopic rod 32, the bottom end of the second damping telescopic rod 32 is fixedly connected to the second shock-absorbing pad 33, the upper surface of the second shock-absorbing pad 33 is located at the periphery of the second damping telescopic rod 32 and is fixedly connected to the third spring 34, the first shock-absorbing pad 31 and the second shock-absorbing pad 33 absorb the vibration generated during the processing, and the second damping telescopic rod 32 and the third spring 34 release the vibration, thereby reducing the noise generated during the processing and avoiding affecting the production environment.

[0033] Fixed blocks 35 are fixedly connected on both sides of the lower surface of the second rotating component. The internal sliding connection of the fixed block 35 is connected to the limiting rod 36. The fixed block 35 slides on the outer surface of the limiting rod 36 to support and limit the lower surface of the second rotating component, so that the connecting block 16 can slide smoothly on the outer surface of the threaded rod 15.

[0034] A sliding groove is provided on the other side of the upper surface of the base plate 1 , and there are three sliding grooves. The sliding grooves on both sides are adapted to the fixed block 35 , and the sliding groove in the middle is adapted to the connecting block 16 . The sliding grooves can limit the fixed block 35 and the connecting block 16 .

[0035] Working principle: First, an external power supply starts the driving motor 14, driving the threaded rod 15 to rotate, and the connecting block 16 then slides on the outer surface of the threaded rod 15, which can drive the second rotating assembly to move, thereby adjusting the distance between the first rotating assembly and the second rotating assembly, which is convenient for fixing crankshaft assemblies of different lengths. At the same time, the fixing block 35 slides on the outer surface of the limiting rod 36 to support and limit the lower surface of the second rotating assembly, so that the connecting block 16 can slide smoothly on the outer surface of the threaded rod 15. Then, the main journal 21 at one end of the crankshaft assembly is placed in the middle of the two arc plates 3, and the hydraulic rod 2 is started to push the arc plate 3 close to the main journal 21. Crankshaft assemblies of different thicknesses can be clamped and fixed, and the contact ball 8 first contacts the main journal 21, and the first spring 6 is squeezed by the push rod 7, and then the bolt 4 is used to pass through the two arc plates 3, and the nut 5 is threaded to the outer surface of the bolt 4. The connection is fixed, and the stability of the arc plate 3 clamping it is improved through the rebound force of the first spring 6. Secondly, the external power supply starts the stepper motor 10, so that the first connecting ring 11 rotates, and the first rotating ring 12 follows the rotation under the limiting action of the first rotating ring 12, so as to facilitate the rotation of the crankshaft assembly. Finally, the strap 26 contacts the second main journal 21 at one end of the crankshaft assembly, and the second spring 27 pushes the strap 26. Combined with the first damping telescopic rod 25, during the processing of the crankshaft assembly, the device can buffer and release the vibration generated by it to reduce the impact on the workpiece. At the same time, under the limiting of the limit block 29, the inner shell 28 moves up and down inside the outer shell 30 to protect the outer surface of the second shock-absorbing assembly. The first shock-absorbing pad 31 and the second shock-absorbing pad 33 absorb the vibration generated during the processing, and the second damping telescopic rod 32 and the third spring 34 release the vibration.

[0036] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations 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 should not be understood as limiting the scope of protection of the present invention.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A positioning device for large crankshaft horizontal machine tool processing, characterized in that: The invention comprises a base plate (1), wherein a first rotating assembly is fixedly connected to one side of the upper surface of the base plate (1), a moving assembly is fixedly connected to one side of the base plate (1), a second rotating assembly is fixedly connected to the upper surface of the moving assembly, a clamping assembly is fixedly connected to the inside of the first rotating assembly and the second rotating assembly, a limiting groove is provided on the inside of the clamping assembly, a stabilizing assembly is fixedly connected to the inside of the limiting groove, a crankshaft assembly is clamped to the inside of the stabilizing assembly, a first damping assembly is fixedly connected to the inside of the first rotating assembly and the second rotating assembly, a protective assembly is fixedly connected to the lower surface of the base plate (1), and a second damping assembly is fixedly connected to the inside of the protective assembly; The clamping assembly comprises a hydraulic rod (2), one end of the hydraulic rod (2) being fixedly connected to the inside of the first rotating assembly or the second rotating assembly, the other end of the hydraulic rod (2) being fixedly connected to an arc-shaped plate (3), both sides of the outer surface of the arc-shaped plate (3) being threadedly connected to bolts (4), and the outer surface of the bolt (4) being threadedly connected to a nut (5); The stabilizing component comprises a first spring (6), one end of the first spring (6) is fixedly connected to the inner wall of the limiting groove, the other end of the first spring (6) is fixedly connected to a push rod (7), and one end of the push rod (7) is fixedly connected to a contact ball (8).

2. The positioning device for large crankshaft horizontal machine tool processing according to claim 1 is characterized in that: The first rotating assembly comprises a first vertical plate (9), the lower surface of the first vertical plate (9) being fixedly connected to one side of the upper surface of the bottom plate (1), a stepping motor (10) being fixedly mounted on one side of the first vertical plate (9), an output end of the stepping motor (10) being fixedly connected to a first connecting ring (11), one end of the first connecting ring (11) being fixedly connected to a first rotating ring (12), and an outer surface of the first rotating ring (12) being rotatably connected to a first supporting ring (13).

3. The positioning device for large crankshaft horizontal machine tool processing according to claim 1 is characterized in that: The moving assembly comprises a driving motor (14), one side of the driving motor (14) is fixedly mounted on one side of the base plate (1), an output end of the driving motor (14) is fixedly connected to a threaded rod (15), and an outer surface of the threaded rod (15) is threadedly connected to a connecting block (16).

4. The positioning device for large crankshaft horizontal machine tool processing according to claim 1, characterized in that: The second rotating assembly comprises a second vertical plate (17), the lower surface of the second vertical plate (17) being fixedly connected to one side of the upper surface of the connecting block (16), a through groove being provided on one side of the second vertical plate (17), a second connecting ring (18) being rotatably connected inside the through groove, a second rotating ring (19) being fixedly connected to one end of the second connecting ring (18), and a second supporting ring (20) being rotatably connected to the outer surface of the second rotating ring (19).

5. The positioning device for large crankshaft horizontal machine tool processing according to claim 1, characterized in that: The crankshaft assembly comprises a main journal (21), the outer surface of the main journal (21) being clamped to the inner side of a contact ball (8), one side of the main journal (21) being fixedly connected to a crank (22), and one side of the crank (22) being fixedly connected to a connecting rod journal (23).

6. The positioning device for large crankshaft horizontal machine tool processing according to claim 1, characterized in that: The first shock absorbing assembly comprises a connecting rod (24), one side of the connecting rod (24) is fixedly connected to the inner side of the first supporting ring (13), the upper surface of the connecting rod (24) is fixedly connected to a first damping telescopic rod (25), the top end of the first damping telescopic rod (25) is fixedly connected to a strap (26), and the upper surface of the connecting rod (24) is fixedly connected to a second spring (27) located at the periphery of the first damping telescopic rod (25).

7. The positioning device for large crankshaft horizontal machine tool processing according to claim 1, characterized in that: The protection component comprises an inner shell (28), the upper surface of the inner shell (28) is fixedly connected to the lower surface of the bottom plate (1), the outer surface of the inner shell (28) is fixedly connected to a limit block (29), and the outer surface of the limit block (29) is slidably connected to an outer shell (30).

8. The positioning device for large crankshaft horizontal machine tool processing according to claim 1, characterized in that: The second shock absorbing assembly comprises a first shock absorbing pad (31), the upper surface of the first shock absorbing pad (31) is fixedly connected to the inner top wall of the inner shell (28), the lower surface of the first shock absorbing pad (31) is fixedly connected to a second damping telescopic rod (32), the bottom end of the second damping telescopic rod (32) is fixedly connected to a second shock absorbing pad (33), and the upper surface of the second shock absorbing pad (33) is located on the periphery of the second damping telescopic rod (32) and is fixedly connected to a third spring (34).

9. The positioning device for large crankshaft horizontal machine tool processing according to claim 1, characterized in that: Both sides of the lower surface of the second rotating assembly are fixedly connected with fixed blocks (35), and the interior of the fixed block (35) is slidably connected with a limit rod (36).

10. The positioning device for large crankshaft horizontal machine tool processing according to claim 1, characterized in that: A sliding groove is provided on the other side of the upper surface of the bottom plate (1), and the number of the sliding grooves is three, wherein the sliding grooves on both sides are adapted to the fixing block (35), and the sliding groove in the middle is adapted to the connecting block (16).

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