Self-centering center frame supporting capacity expansion device

Abstract

The utility model provides a supporting capacity expanding device for a self-centering center frame, which comprises two side supporting arms and a lower supporting arm which are arranged on the self-centering center frame and are symmetrical left and right, and further comprises two symmetrical side surface extending supports and a lower part extending support, the rear ends of the side face extending supports are correspondingly installed on the side supporting arms through supporting positioning pins respectively. The rear end of the lower extension support is mounted at a lower support arm of the self-centering center frame through a positioning pin; the side surface extension support comprises a side surface extension support seat and a roller mounted at the front end of the side surface extension support seat through a roller positioning pin; and the lower extension support comprises a lower extension support seat and rollers mounted on the bottom extension support seat through roller positioning pins. The supporting device is simple in structure, convenient to disassemble and assemble, reliable in precision and wide in supporting range, and follows the original supporting design principle.

Description

Technical Field

[0001] The utility model belongs to the field of machining supports for crankshafts and shaft systems, and particularly relates to a self-centering steady rest support capacity expansion device. Background Technique

[0002] When the existing horizontal turning and milling machining center is used for machining crankshafts and shaft systems, a self-centering steady rest (model: SLUA-8 produced by SMW-AUTOBLOK company) is equipped for supporting the crankshaft. See Figure 2 , this self-centering steady rest has two symmetric left and right side support arms and a lower support arm respectively. The lower end of the lower support arm is fixed on the lifting mechanism, and the left and right side support arms are also connected to the same lifting mechanism through a multi-link mechanism. During use, it can be opened and clamped within the range of 200 - 800 according to the different sizes of the crankshaft journal. The opening and clamping rely on a set of hydraulic cylinders to drive the lifting mechanism, enabling the three support arms to act simultaneously, so that the clamping circle formed by the three support rollers is always concentric with the main shaft, ensuring that the products within the support range can be directly clamped without alignment. However, due to the increase in product types, the crankshafts with journal diameters less than 200 exceed the clamping range of the self-centering steady rest and cannot be clamped, so they cannot be machined either. How to achieve the machining of crankshafts with small journal diameters is a prominent problem. Summary of the Invention

[0003] The purpose of the utility model is to address the above technical difficulties and provide a self-centering steady rest support capacity expansion device with a simple structure, convenient disassembly and installation, reliable accuracy, following the original support design principle, and a wide support range.

[0004] To achieve the above object, the utility model provides a self-centering steady rest support capacity expansion device, which includes two symmetric side support arms one (1.5) and side support arms two (1.6) and a lower support arm (1.4) on the self-centering steady rest (1), and also includes two symmetric side extension supports one (2) and side extension supports two (3) and a lower extension support (4). Among them, the rear ends of the side extension support one (2) and the side extension support two (3) are respectively installed at the side support arm one (1.5) and the side support arm two (1.6) through the support positioning pin one (2.4) and the support positioning pin two (3.4); the rear end of the lower extension support (4) is installed at the lower support arm (1.4) of the self-centering steady rest (1) through the positioning pin (4.4); the side extension support one (1.5) and the side support arm two (3) include a side extension support seat one (2.1) and a side extension support seat two (3.1) and a roller one (2.2) and a roller two (3.2) installed at the front ends of the side extension support seat one (2.1) and the side extension support seat two (3.1) through the roller positioning pin one (2.3) and the roller positioning pin two (3.3); the lower extension support (4) includes a lower extension support seat (4.1) and a roller three (4.2) installed on the lower extension support seat (4.1) through the roller positioning pin three (4.3).

[0005] The support centers of the rollers one (2.2), rollers two (3.2) and roller three (4.2) of the two symmetric side extension supports one (2), side extension supports two (3) and a lower extension support (4) coincide with the axis of the supported crankshaft.

[0006] Grooves are formed on the inner sides of the front ends of the side support arm one (1.5) and the side support arm two (1.6). The rear sections of the side extension support seat one (2.1) and the side extension support seat two (3.1) are inserted into the grooves and fixed with the support positioning pin one (2.4) and the support positioning pin two (3.4); the rear end faces of the side extension support seat one (2.1) and the side extension support seat two (3.1) are upper inclined surfaces, and the bottom surfaces of the grooves on the inner sides of the front ends of the side support arm one (1.5) and the side support arm two (1.6) are lower inclined surfaces that can be correspondingly attached to the upper inclined surfaces.

[0007] The slopes of the upper inclined surface and the lower inclined surface are 11°.

[0008] The middle sections of the side extension support seat one (2.1) and the side extension support seat two (3.1) have protruding front limiting surfaces, and the inner side surfaces of the front ends of the side support arm one (1.5) and the side support arm two (1.6) are rear limiting surfaces that can be correspondingly attached to the front limiting surfaces.

[0009] In view of the problems existing in the background art, the inventor has improved the existing self-centering steady rest. By adding extended supports to both symmetric left and right side support arms I and II and a lower support arm, the support distance for the crankshaft is shortened, thus meeting the requirements for supporting small-diameter crankshafts. In order to adapt to the existing self-centering steady rest structure, it is only necessary to remove the original rollers on the two symmetric left and right side support arms I and II and a lower support arm of the original self-centering steady rest, and cleverly utilize the grooves for installing the original rollers to install the extended supports.

[0010] In addition, for effective support and precise positioning, so that the clamping center of the rollers always remains consistent with the clamping center of the original steady rest, special positioning surfaces are designed on the side extended support and the lower extended support. That is, the rear end face of the side extended support seat is an upper inclined surface, and the bottom surface of the groove inside the front end of the side support arm is a lower inclined surface that can be correspondingly fitted with the upper inclined surface; and a prominent front limiting surface is provided in the middle section of the side extended support seat, and the inner side wall of the front end of the side support arm is a rear limiting surface that can be correspondingly fitted with the front limiting surface.

[0011] The design of the support capacity expansion device follows the original clamping center of the steady rest, that is, the clamping centers of the rollers on the three extended supports always remain consistent with the clamping center of the original steady rest, realizing the self-centering clamping function.

[0012] The original self-centering steady rest has a support shaft system range of Φ200 - Φ800 mm, and the minimum support range is Φ200 mm; after adopting the present utility model, the minimum support range is extended to Φ100 mm, with convenient disassembly and installation, reliable accuracy, following the original support design principle, and can freely support within the range of 100 - 800 mm.

[0013] Compared with the prior art, the present utility model solves the problem that small-diameter crankshafts cannot be clamped and processed on a machining center, follows the self-centering principle, expands the crankshaft processing range, and at the same time is simple and convenient to disassemble and assemble, with reliable accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the device of the present utility model;

[0015] Figure 2 is a schematic diagram of the clamping principle of the existing self-centering steady rest;

[0016] Figure 3 is a schematic diagram of the three extended supports;

[0017] Figure 4 is an assembly schematic diagram of the extended support;

[0018] Figure 5 is the front view of the side extended support seat;

[0019] Figure 6It is a side view of the side extension support base;

[0020] Figure 7 It is a front view of the front end of the side extension support arm;

[0021] Figure 8 It is a side view of the front end of the side extension support arm.

[0022] Where 1 - self-centering steady rest, 1.1 - lifting oil cylinder, 1.2 - lifting mechanism, 1.3 - connecting rod mechanism, 1.4 - lower support arm, 1.5 - side support arm 1, 1.6 - side support arm 2, 1.6.1 - bottom surface of the groove, 1.6.2 - inner side surface, 2 - side extension support 1, 2.1 - side extension support base 1, 2.2 - roller 1, 2.3 - roller positioning pin 1, 2.4 - support positioning pin 1, 3 - side extension support 2, 3.1 - side extension support base 2, 3.1.1 - upper inclined surface, 3.1.2 - front limit surface, 3.2 - roller 2, 3.3 - roller positioning pin 2, 3.4 - support positioning pin 2, 4 - lower extension support, 4.1 - lower extension support base, 4.2 - roller 3, 4.3 - roller positioning pin 3, 4.4 - support positioning pin. Detailed implementation mode

[0023] The present utility model will be further explained below in conjunction with the attached drawings:

[0024] See Figure 1 , including a hydraulic oil cylinder 1.1, a lifting mechanism 1.2 and a connecting rod mechanism 1.3. The top of the lifting mechanism 1.2 is provided with a lower support arm 1.4. The connecting rod mechanism 1.3 is connected to two symmetric left and right side support arms 1.5 and side support arms 2 1.6. Grooves (rollers can be installed) are provided at the ends of the lower support arm 1.4 and the two side support arms 1.5 and side support arms 2 1.6.

[0025] A side extension support 1 2 and a side extension support 2 3 are installed on the two side support arms 1.5 and side support arm 2 1.6, and a lower extension support 4 is installed on the lower support arm 1.4. Among them, the side extension support 1 2 and the side extension support 2 3 have the same structure. Figure 3 , Figure 4 As shown in Figure 5 , Figure 6As shown in the figure, in order to ensure the effective positioning of the extended support and the support arm of the center rest, the lower extended support 4 includes a lower extended support base 4.1. The front end of the lower extended support base 4.1 is equipped with a second roller 4.2 through a third roller positioning pin 4.3, and the rear end is installed in the groove at the front end of the lower extended support 4 through a support positioning pin 4.4. Among them, the first roller 2.2, the second roller 3.2 and the second roller 4.2 have the same specifications, the first roller positioning pin 2.3, the second roller positioning pin 3.3 and the third roller positioning pin 4.3 have the same structure, and the first support positioning pin 2.4, the second support positioning pin 3.4 and the second support positioning pin 4.4 have the same structure.

[0026] Figures 5 - 8 As shown in the figure, in order to ensure the effective positioning of the extended support and the support arm and the clamping accuracy meets the requirements, according to the front-end structure of the support arm, dedicated positioning surfaces are designed on the first side extended support 2, the second side extended support 3 and the lower extended support 4. Taking the second side extended support 3 as an example, the inner side of the front end of the second side support arm 1.6 has a groove, and the rear section of the second side extended support base 3.1 is inserted into the groove and fixed with a second support positioning pin 3.4; the rear end face of the second side extended support base 3.1 is an upper inclined surface 3.1.1, and the bottom surface 1.6.1 of the groove on the inner side of the front end of the second side support arm 1.6 is a lower inclined surface that can be correspondingly attached to the upper inclined surface 3.1.1. The slope a of the upper inclined surface 3.1.1 and the lower inclined surface is 11°. The middle section of the second side extended support base 3.1 has a protruding front limiting surface 3.1.2 (such as a vertical positioning surface), and the inner side surface of the front end of the second side support arm 1.6 is a rear limiting surface (such as a vertical surface) that can be correspondingly attached to the front limiting surface 3.1.2. Through the above two positions of positioning, the effective positioning between the second side extended support 3 and the second side support arm 1.6 is realized.

[0027] The self-centering function after the device is installed is realized by the hydraulic cylinder 1.1 driving the lifting mechanism 1.2 to move up and down. The lower support arm 1.4 moves simultaneously with the lifting mechanism 1.2. The lifting mechanism 1.2 drives the link mechanism 1.3 to move while moving, thereby driving the first side support arm 1.5 and the second side support arm 1.6 to move together. Since the actions of the three support arms are all driven by the hydraulic cylinder 1.1, the three support arms can be synchronously opened or clamped to realize the self-centering of the workpiece support.

[0028] When clamping a crankshaft journal with a clamping dimension in the range of 200 - 800, an existing self-centering center rest can be used. When it is necessary to support a crankshaft with a journal diameter less than 200, the front rollers of the three support arms of the original center rest can be removed first, and then the first side extended support 2 and the second side extended support 3 are correspondingly installed in the grooves at the front ends of the first side support arm 1.5 and the second side support arm 1.6, and the lower extended support 4 is correspondingly installed in the groove at the front end of the lower support arm 1.4. The clamping center of the rollers on the three extended supports always remains consistent with the clamping center of the original center rest, realizing the self-centering clamping function.

[0029] The utility model is convenient for disassembly and installation, has reliable precision, follows the original support design principle, and can freely support within the range of 100 - 800 mm.

Claims

1. An apparatus for expanding the supporting capacity of a self-centering steady rest, comprising two symmetrically arranged left and right first side support arms (1.5) and second side support arms (1.6) on a self-centering steady rest (1), and a lower support arm (1.4), characterized in that, It further includes two symmetrical side extension supports I (2) and side extension supports II (3) and a lower extension support (4). Among them, the rear ends of the side extension supports I (2) and side extension supports II (3) are respectively installed at the side support arms I (1.5) and side support arms II (1.6) through the support positioning pins I (2.4) and support positioning pins II (3.4); the rear end of the lower extension support (4) is installed at the lower support arm (1.4) of the self-centering steady rest (1) through the positioning pin (4.4); the side extension supports I (2) and side extension supports II (3) include side extension support bases I (2.1) and side extension support bases II (3.1) and rollers I (2.2) and rollers II (3.2) installed at the front ends of the side extension support bases I (2.1) and side extension support bases II (3.1) through the roller positioning pins I (2.3) and roller positioning pins II (3.3); the lower extension support (4) includes a lower extension support base (4.1) and a roller III (4.2) installed on the lower extension support base (4.1) through the roller positioning pin III (4.3).

2. The self-centering steady rest support capacity expansion device according to claim 1, wherein: The support centers of the rollers I (2.2), rollers II (3.2) and roller III (4.2) of the two symmetrical side extension supports I (2) and side extension supports II (3) and a lower extension support (4) coincide with the axis of the supported crankshaft.

3. The self-centering steady rest support capacity expansion device according to claim 1, wherein: Grooves are formed on the inner sides of the front ends of the side support arms I (1.5) and side support arms II (1.6). The rear sections of the side extension support bases I (2.1) and side extension support bases II (3.1) are inserted into the grooves and fixed with the support positioning pins I (2.4) and support positioning pins II (3.4); the rear end faces of the side extension support bases I (2.1) and side extension support bases II (3.1) are upper inclined surfaces, and the bottom surfaces of the grooves on the inner sides of the front ends of the side support arms I (1.5) and side support arms II (1.6) are lower inclined surfaces that can be correspondingly attached to the upper inclined surfaces.

4. The self-centering steady rest support capacity expansion device according to claim 3, characterized in that: The slopes of the upper inclined surface and the lower inclined surface are 11°.

5. The self-centering steady rest support capacity expansion device according to claim 3 or 4, characterized in that: The middle sections of the side extension support bases I (2.1) and side extension support bases II (3.1) have protruding front limiting surfaces, and the inner side surfaces of the front ends of the side support arms I (1.5) and side support arms II (1.6) are rear limiting surfaces that can be correspondingly attached to the front limiting surfaces.

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