Crankshaft lathe center frame

Abstract

The utility model relates to a crankshaft lathe center frame which comprises a supporting frame body which is driven by a translation driving mechanism and can move along a guide rail. Two telescopic supporting assemblies are arranged on the supporting frame, and each telescopic supporting assembly comprises a supporting arm, a cushion block arranged at the front end of the supporting arm and used for supporting the lower portion of a crankshaft main journal and a telescopic driving mechanism controlling the supporting arm to stretch out and draw back in the radial direction of the main journal on the supporting frame. The two supporting arms are symmetrically arranged about the center line of the main journal, and the telescopic axes of the two supporting arms are coplanar and perpendicular to the extending direction of the guide rail. The device has the advantages that the movement of the support frame and the stretching of the support arm are controlled through the servo motor, so that the operation of the support frame is remotely controlled, the processing operability is improved, the labor intensity of workers can be greatly reduced, and the skill training of the workers is easier to realize.

Description

Technical Field

[0001] This utility model relates to the field of crankshaft manufacturing and processing technology, and in particular to a crankshaft lathe center rest. Background Technology

[0002] Marine crankshafts are supported and positioned by several center supports on a crankshaft lathe. The relative positions of the supports of each center support directly affect the coaxiality of the entire crankshaft. Therefore, before machining a semi-assembled marine crankshaft on a crankshaft lathe, the crankshaft must be precisely positioned. The method is as follows: When positioning the crankshaft, the operator places a shift gauge in the shift gauge and rotates it with the crankshaft. Then, the operator rotates the crankshaft. After rotation, several operators observe and record the shift gauge readings near the crankshaft to measure the shift distance between each pair of adjacent crank arms and observe the change in the crank distance within one rotation cycle to determine the coaxiality of the entire crankshaft. For crankshafts with coaxiality errors, the center support supports are adjusted manually by rotating the handles to correct the errors.

[0003] It is obvious that this method of adjusting the support frame is highly dangerous and labor-intensive, consuming a significant amount of manpower and time. Therefore, this manual adjustment of the support frame severely affects the machining quality and cycle time of the crankshaft, and is extremely unfavorable for on-site machining.

[0004] In response to this production situation, there is an urgent need for a device that can automatically adjust the support frame pillars to replace the current support frame. Utility Model Content

[0005] The purpose of this utility model embodiment is to address the shortcomings of existing technology structures by proposing a crankshaft lathe center rest to solve the defects in the existing technology.

[0006] To achieve the aforementioned objectives of this utility model, the crankshaft lathe center rest proposed in this embodiment is implemented through the following technical solution:

[0007] A crankshaft lathe center rest, characterized in that the center rest comprises: a support frame body driven by a translation drive mechanism and capable of moving along a guide rail; the support frame is provided with two telescopic support assemblies, each telescopic support assembly including a support arm, a pad block disposed at the front end of the support arm for supporting the lower part of the crankshaft main journal, and a telescopic drive mechanism for controlling the radial extension and retraction of the support arm along the main journal on the support frame; the two support arms are symmetrically arranged about the center line of the main journal, and their telescopic axes are coplanar and the plane is perpendicular to the extension direction of the guide rail.

[0008] The telescopic axis of the support arm forms a 45° angle with the horizontal plane.

[0009] The telescopic drive mechanism includes a motor, a gearbox, a transmission mechanism, a lead screw, and a lead screw nut; the motor output shaft is vertically arranged, and the gearbox is connected to the motor output shaft; the transmission mechanism is connected between the gearbox output shaft and the lead screw, and the lead screw nut is sleeved on the lead screw and connected to the support arm.

[0010] The transmission mechanism includes a first bevel gear, a rotating shaft, and a second bevel gear fixed on the output shaft of the gearbox; the rotating shaft is mounted on a support frame in a horizontally rotatable manner, with a third bevel gear meshing with the first bevel gear at one end and a fourth bevel gear meshing with the second bevel gear at the other end; the second bevel gear is coaxially fixed on the lead screw.

[0011] The lead screw is a ball screw, and the lead screw nut is a ball screw nut.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This utility model provides a crankshaft lathe center support, which controls the movement of the support frame and the extension and retraction of the support arm through a servo motor, thereby realizing remote control of the support frame operation. This not only improves the ease of operation of machining, but also greatly reduces the labor intensity of workers and makes it easier to carry out skills training for workers. Attached Figure Description

[0014] The above features and advantages of the present invention will become clearer and easier to understand from the following description of exemplary embodiments thereof in conjunction with the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the support frame structure according to an embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the telescopic drive mechanism according to an embodiment of the present invention. Detailed Implementation

[0017] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] The terms "front," "rear," "left," "right," "inner," and "outer" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

[0019] In the description of the following embodiments, unless otherwise expressly specified and limited, the term "connection" and other such terms should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] See Figure 1-2 As shown in the embodiment of this utility model, a crankshaft lathe center rest is proposed. In actual operation, the number of center rests is determined by the number of crankshaft main journals that need to be supported, and can be increased or decreased at will according to the operation requirements.

[0021] See Figure 1-2 As shown, the central frame includes a support frame body 1, and a translation drive mechanism is provided on the support frame body 1 to drive the support frame body 1 to move along the guide rail. In this embodiment, the translation drive mechanism adopts a servo motor drive scheme. Since this structure is a known technology and is not the focus of protection of this application, its structure will not be described in detail here. Any drive scheme that can realize the movement of the support bearing heavy objects on the track can be applied here.

[0022] The support frame body 1 is provided with two telescopic support assemblies 2. The telescopic support assembly 2 includes a support arm 21, a pad 22, and a telescopic drive mechanism for controlling the extension and retraction of the support arm 21.

[0023] The pad 22 is located at the front end of the support arm 21 and is used to support the lower part of the crankshaft main journal.

[0024] The extension and retraction direction of the support arm 21 is radial to the main journal on the support frame. Simultaneously, the axes of the two support arms 21 lie on the same virtual plane perpendicular to the guide rail 3 and are symmetrically arranged along the vertical line. In a preferred embodiment, the extension and retraction axis of the support arm 21 forms a 45° angle with the horizontal plane.

[0025] The telescopic drive mechanism includes a motor 23, a reduction gearbox 24, a transmission mechanism, a lead screw 25, and a lead screw nut 26. The output shaft of the motor 23 is vertically arranged, and the reduction gearbox 24 is connected to the output shaft of the motor 23. The lead screw nut 26 is sleeved on the lead screw 25 and connected to the support arm 21. The transmission mechanism is connected between the output shaft of the reduction gearbox 24 and the lead screw 25. In a specific embodiment, the transmission mechanism includes a first bevel gear 27, a rotating shaft 28, and a second bevel gear 29 fixed on the output shaft of the reduction gearbox 24. The two ends of the rotating shaft 28 are mounted on the support frame body 1 in a horizontally rotatable manner via bearings. A third bevel gear 281 and a fourth bevel gear 282 are sleeved on the rotating part between the two bearings. The third bevel gear 281 and the fourth bevel gear 282 are interference-fitted with the rotating shaft 28 and are located near the two ends of the rotating shaft 28, respectively. The third bevel gear 281 meshes with the first bevel gear 27, and the fourth bevel gear 282 meshes with the second bevel gear 29. The second bevel gear 29 is coaxially fixed on the lead screw 25.

[0026] With the above structure, the rotation of motor 23 drives the lead screw 25 to rotate, which in turn converts into the back-and-forth movement of support arm 21 along the radial direction of the main journal. Thus, the motor 23 can realize the support adjustment of the crankshaft main journal by the center frame 1.

[0027] This utility model provides a crankshaft lathe center support. The center support of the crankshaft lathe is controlled by a servo motor to move the support frame and extend and retract the support arm, thereby realizing remote control of the support frame operation. This not only improves the ease of operation of machining, but also greatly reduces the labor intensity of workers and makes it easier to carry out skills training for workers.

[0028] The present invention has been described in detail above through embodiments. However, those skilled in the art will understand that the above embodiments are only one of the preferred embodiments of the present invention. Due to space limitations, not all embodiments can be listed here. Any implementation that can embody the technical solution of the claims of the present invention is within the protection scope of the present invention.

[0029] It should be noted that the above content is a further detailed description of the present utility model in conjunction with specific embodiments, and it should not be considered that the specific embodiments of the present utility model are limited to this. Under the guidance of the above embodiments, those skilled in the art can make various improvements and modifications based on the above embodiments, and these improvements or modifications fall within the protection scope of the present utility model.

Claims

1. A crankshaft lathe center rest, characterized in that, The center frame includes: a support frame body that is driven by a translation drive mechanism and can move along the guide rail; the support frame is provided with two telescopic support assemblies, each telescopic support assembly including a support arm, a pad block located at the front end of the support arm for supporting the lower part of the crankshaft main journal, and a telescopic drive mechanism for controlling the radial extension and retraction of the support arm along the main journal on the support frame; the two support arms are symmetrically arranged about the center line of the main journal, and their telescopic axes are coplanar and the plane is perpendicular to the extension direction of the guide rail.

2. The crankshaft lathe center rest according to claim 1, characterized in that: The telescopic axis of the support arm forms a 45° angle with the horizontal plane.

3. A crankshaft lathe center rest according to claim 1, characterized in that: The telescopic drive mechanism includes a motor, a gearbox, a transmission mechanism, a lead screw, and a lead screw nut; the motor output shaft is vertically arranged, and the gearbox is connected to the motor output shaft; the transmission mechanism is connected between the gearbox output shaft and the lead screw, and the lead screw nut is sleeved on the lead screw and connected to the support arm.

4. A crankshaft lathe center rest according to claim 3, characterized in that: The transmission mechanism includes a first bevel gear, a rotating shaft, and a second bevel gear fixed on the output shaft of the gearbox; the rotating shaft is mounted on a support frame in a horizontally rotatable manner, with a third bevel gear meshing with the first bevel gear at one end and a fourth bevel gear meshing with the second bevel gear at the other end; the second bevel gear is coaxially fixed on the lead screw.

5. A crankshaft lathe center rest according to claim 4, characterized in that: The lead screw is a ball screw, and the lead screw nut is a ball screw nut.

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