Center frame for lathe

Abstract

The center frame for the lathe comprises a sliding support, a positioning ring and a positioning connecting piece, two clamping plates are vertically arranged at the top of the sliding support, the positioning ring is fixedly connected between the two clamping plates through bolts, three adjusting blocks are annularly and evenly distributed on the outer side of the positioning ring, and the positioning connecting piece is fixedly connected with the positioning ring through bolts. An adjusting threaded hole is formed in the center of the adjusting block in a penetrating mode, a spring mounting groove is formed in the top of the adjusting threaded hole, mounting holes are symmetrically formed in the two sides of the adjusting threaded hole, a positioning connecting piece is slidably connected to the inner side of the adjusting block, a positioning roller is arranged at the top of the positioning connecting piece, and two connecting sliding rods are arranged at the tail of the positioning connecting piece. According to the auxiliary supporting device for the middle of the long shaft part, the middle of the long shaft part is supported in an auxiliary mode through the positioning idler wheel, when a machine tool works, the workpiece is prevented from being heated due to friction, and the auxiliary supporting device for the middle of the long shaft part is convenient to use.

Description

TECHNICAL FIELD

[0001] The utility model relates to lathe field, concretely is center rest for lathe. BACKGROUND

[0002] The lathe is the machine tool that mainly uses the lathe tool to turn the workpiece of rotation and carries out the turning machining. The lathe is the most main cutting machine tool in the metal cutting machine tool, and the lathe is the most in the general machine manufacturing factory, also called work mother machine. On the lathe, drill, reamer, reamer, tap, die and knurling tool can be used to carry out corresponding processing. The function of lathe is to carry out cutting processing to the rotation surface of various sizes and different shapes, and the helical surface.

[0003] When the long shaft workpiece is machined, the workpiece will fall due to the weight, causing the end of the part to jump unqualified, affecting the machining quality, and the center rest is needed to support the part. The existing center rest for lathe, the supporting surface is generally fixed surface structure, when machining the workpiece, due to the friction force of the contact surface between the workpiece and the center rest, the center rest is worn, the service life is reduced, in addition, the friction force will cause the workpiece supporting position to heat, long time machining will damage the physical properties of the workpiece. Therefore, the center rest for lathe is provided by the person skilled in the art to solve the problems raised in the above background technology. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing the center rest for lathe to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the utility model provides the following technical scheme:

[0006] The center rest for lathe, including sliding support, positioning ring and positioning connecting piece, the top of sliding support is vertically provided with two clamping plates, the positioning ring is fixedly connected between the two clamping plates through bolt, the outer side of positioning ring is evenly distributed with three adjusting blocks, the center position of adjusting block is penetratedly provided with adjusting screw hole, the adjusting screw hole is connected with adjusting bolt in screw, the top of adjusting screw hole is provided with spring mounting groove, the both sides of adjusting screw hole are symmetrically provided with mounting hole, the inner side of adjusting block is slidably connected with positioning connecting piece, the top of positioning connecting piece is provided with positioning roller, the tail of positioning connecting piece is provided with two connecting sliding rods, the connecting sliding rod is slidably connected with mounting hole, the center position of tail of positioning connecting piece is provided with spring connecting hole, the top end of spring mounting groove and the top end of spring connecting hole are fixedly connected with return spring.

[0007] Further, the bottom surface of the sliding support is provided with pulley frame mounting grooves on both sides, the lifting pulley frames are arranged in the pulley frame mounting grooves, a plurality of pulleys are arranged in the lifting pulley frames, lifting bolts are threadedly connected to the top center of the pulley frame mounting grooves, and the lifting bolts are rotationally connected to the top of the lifting pulley frames.

[0008] Further, the top of the lifting pulley frame is symmetrically provided with guide rods, and the guide rods are slidably connected to the bottom plate of the sliding support.

[0009] Further, the bottom center of the sliding support is provided with a guide sliding block, and the guide sliding block is slidably connected to a sliding groove on the machine tool.

[0010] Further, the side surface of the pulley frame mounting groove is provided with a positioning straight slot, and a bolt is arranged in the positioning straight slot and is threadedly connected to the machine tool.

[0011] Further, the tail of the positioning connecting piece is an abutting arc surface, and the radius of the abutting arc surface is the same as the inner diameter of the positioning ring.

[0012] Further, two mounting through holes are symmetrically arranged through the bottom of the positioning ring, a bolt is arranged through the clamping plate of the sliding support and is fixedly connected to the mounting through hole, and a reinforcing plate is welded to the bottom of each clamping plate of the sliding support.

[0013] In the utility model, the positioning ring is slid from the machining end of the workpiece to the middle position of the workpiece by moving the sliding support, the adjusting bolts on the three adjusting blocks are adjusted after the sliding support is locked, the adjusting bolts are moved to the positioning connecting piece to push the positioning connecting piece and the positioning ring to be slidably connected, the reset spring is stretched, the connecting slide rod and the mounting hole are slidably connected, the three positioning rollers support and fix the workpiece, the middle position of the workpiece is horizontal, the machining quality is guaranteed, during machining, the positioning rollers rotate between the positioning rollers and the workpiece, the friction of the support is reduced, the service life is improved, the workpiece is not heated, and the workpiece is prevented from being damaged.

[0014] 2、In the utility model, the two lifting bolts on the bottom plate of the sliding support are screwed to the bottom, the lifting bolts push the lifting pulley frames to move downward, the guide rods are slidably connected to the bottom plate of the sliding support, the pulleys are attached to the bottom of the lathe, the bottom plate of the sliding support is separated from the bottom of the lathe, the friction is reduced, the sliding support is moved at this time, physical strength is saved, and the sliding is smooth. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is a structural schematic view of the utility model;

[0016] Fig. 2 It is a structural top view schematic view of the utility model;

[0017] Fig. 3It is the structure schematic view of the section A-A in the utility model.

[0018] Fig. 4 It is the structure schematic view of the positioning ring in the utility model.

[0019] Fig. 5 It is the structure schematic view of the positioning connecting piece in the utility model.

[0020] Fig. 6 It is the structure schematic view of the sliding support in the utility model.

[0021] In the drawing: 1, sliding support; 2, positioning ring; 3, adjusting block; 4, adjusting bolt; 5, positioning connecting piece; 6, positioning roller; 7, guide sliding block; 8, lifting pulley frame; 9, pulley; 10, guide rod; 11, lifting bolt; 12, positioning straight slot; 13, connecting slide bar; 14, spring mounting groove; 15, return spring; 16, mounting hole; 17, adjusting screw hole; 18, mounting through hole; 19, spring connecting hole; 20, fitting camber; 21, pulley frame mounting sink; 22, reinforcing plate. DETAILED DESCRIPTION

[0022] Please refer to Figs. 1-6 In the embodiment of the utility model, the center frame for lathe, including sliding support 1, positioning ring 2 and positioning connecting piece 5, the top of sliding support 1 is vertically provided with two clamping plates, and the two clamping plates are fixedly connected with positioning ring 2 through bolt, the outer side of positioning ring 2 is evenly distributed with three adjusting blocks 3, adjusting screw hole 17 is arranged at the center position of adjusting block 3, adjusting screw hole 17 is connected with adjusting bolt 4 through thread in, the top of adjusting screw hole 17 is provided with spring mounting groove 14, and the both sides of adjusting screw hole 17 are symmetrically provided with mounting hole 16, the inner side of adjusting block 3 is slidably connected with positioning connecting piece 5, the top of positioning connecting piece 5 is provided with positioning roller 6, the tail of positioning connecting piece 5 is provided with two connecting slide bars 13, connecting slide bar 13 is slidably connected with mounting hole 16, the tail center position of positioning connecting piece 5 is provided with spring connecting hole 19, and the top end of spring mounting groove 14 and the top end of spring connecting hole 19 are fixedly connected with return spring 15, when not working, adjusting bolt 4 does not contact with positioning connecting piece 5, positioning connecting piece 5 is always attached to the inner side of positioning ring 2 under the contraction of spring, so that workpiece is inserted into the inside of positioning ring 2, the three positioning roller 6 at the top of positioning connecting piece 5 is used to position and support shaft workpiece, the friction between positioning roller 6 and workpiece is reduced by the rotation of positioning roller 6 when machining, the service life of positioning connecting piece 5 is increased, workpiece heating is reduced, and workpiece damage is prevented.

[0023] The bottom surface of the sliding support 1 is provided with a pulley frame mounting groove 21 on both sides, the pulley frame mounting groove 21 is provided with a lifting pulley frame 8, the lifting pulley frame 8 is provided with a plurality of pulleys 9, the top center of the pulley frame mounting groove 21 is provided with a lifting bolt 11 through screw connection, the lifting bolt 11 is rotatably connected with the top of the lifting pulley frame 8, and rotating the lifting bolt 11 to the bottom can make the bottom plate of the sliding support 1 away from the lathe bottom plate, so as to facilitate the movement of the sliding support 1 and save labor;

[0024] The top of the lifting pulley frame 8 is symmetrically provided with a guide rod 10, the guide rod 10 is slidably connected with the bottom plate of the sliding support 1, and the lifting stability of the lifting pulley frame 8 is improved.

[0025] The bottom center of the sliding support 1 is provided with a guide block 7, and the guide block 7 is slidably connected with a sliding groove on the machine tool.

[0026] The side surface of the pulley frame mounting groove 21 is provided with a positioning straight slot 12, the positioning straight slot 12 is provided with a bolt for screw connection with the machine tool, the positioning ring 2 is always supported at the middle position of the workpiece for different lengths of workpieces, and the stability of the support is improved.

[0027] The tail of the positioning connecting piece 5 is a matching arc surface 20, the radius of the matching arc surface 20 is the same as the inner diameter of the positioning ring 2, the contact area of the positioning ring 2 and the positioning connecting piece 5 is increased, and the stability is improved.

[0028] The bottom of the positioning ring 2 is symmetrically provided with two mounting through holes 18, the mounting through holes 18 are fixedly connected after the bolts penetrate the clamping plates of the sliding support 1, and the bottom of each clamping plate of the sliding support 1 is welded with a reinforcing plate 22, so that the structural strength of the sliding support 1 is improved.

[0029] The utility model discloses a work principle is: first two lifting bolts 11 on the bottom plate of sliding support 1 are screwed to the bottom, and lifting bolt 11 promotes lifting pulley frame 8 to move down, and guiding rod 10 is slidably connected with the bottom plate of sliding support 1, makes pulley 9 and lathe bottom adhere, and the bottom plate of sliding support 1 is separated from lathe bottom, at this time, first push sliding support 1 and move to the machining end of workpiece, after installing shaft workpiece, push sliding support 1 and make workpiece pass through positioning ring 2, and guiding slider 7 is slidably connected with lathe, and move sliding support 1 and save physical strength, convenient to use, until positioning ring 2 is located in the middle position of workpiece, at this time, reverse rotation lifting bolt 11 makes pulley 9 leave lathe bottom, and use bolt and pass through positioning straight slot 12 and lathe bottom carry out screw thread connection, and the fixed sliding support 1, finally adjust the adjusting bolt 4 on three adjusting blocks 3, and adjusting bolt 4 moves and pushes positioning connecting piece 5 and positioning ring 2 carry out sliding connection with adjusting bolt 4, and reset spring 15 stretches, and connecting slide bar 13 and mounting hole 16 carry out sliding connection, and three positioning rollers 6 support and fix workpiece, make the middle position of workpiece be in horizontal, and slow -speed start lathe and measure the runout of workpiece, according to the measurement situation, three adjusting bolts 4 are fine -tuned, and after measuring and being qualified, carry out reprocessing, through the rotary connection of positioning roller 6 and workpiece, reduce the friction between both, improve the service life of center stand.

Claims

1. A centre rest for a lathe, comprising a sliding support (1), a positioning ring (2) and a positioning connector (5), characterised in that: The top of the sliding support (1) is vertically provided with two clamping plates, and the two clamping plates are fixedly connected by bolts and have a positioning ring (2) therebetween, three adjusting blocks (3) are uniformly distributed on the outer side of the positioning ring (2), an adjusting threaded hole (17) is arranged at the center position of the adjusting block (3), an adjusting bolt (4) is threadedly connected in the adjusting threaded hole (17), a spring mounting groove (14) is arranged at the top of the adjusting threaded hole (17), mounting holes (16) are symmetrically arranged on both sides of the adjusting threaded hole (17), a positioning connecting piece (5) is slidably connected to the inner side of the adjusting block (3), a positioning roller (6) is arranged at the top of the positioning connecting piece (5), two connecting sliding rods (13) are arranged at the tail of the positioning connecting piece (5), the connecting sliding rods (13) are slidably connected with the mounting holes (16), a spring connecting hole (19) is arranged at the tail center position of the positioning connecting piece (5), and a return spring (15) is fixedly connected between the top end of the spring mounting groove (14) and the top end of the spring connecting hole (19).

2. The headstock for a lathe according to claim 1, characterized in that: The bottom surface of the sliding support (1) is provided with a pulley frame mounting recess (21) on both sides, the pulley frame mounting recess (21) is provided with a lifting pulley frame (8), a plurality of pulleys (9) are arranged in the lifting pulley frame (8), a lifting bolt (11) is threadedly connected at the top center of the pulley frame mounting recess (21), and the lifting bolt (11) is rotatably connected with the top of the lifting pulley frame (8).

3. The headstock for a lathe according to claim 2, characterized in that: The top of the lifting pulley frame (8) is symmetrically provided with a guide rod (10), and the guide rod (10) is slidably connected with the bottom plate of the sliding support (1).

4. The headstock for a lathe of claim 1, wherein: The bottom center position of the sliding support (1) is provided with a guide sliding block (7), and the guide sliding block (7) is slidably connected with a sliding groove on the machine tool.

5. The headstock for a lathe of claim 2, wherein: The side surface of the pulley frame mounting recess (21) is provided with a positioning straight slot (12), and the positioning straight slot (12) is provided with a bolt for threadedly connecting with the machine tool.

6. The headstock for a lathe of claim 1, wherein: The tail of the positioning connecting piece (5) is a matching arc surface (20), and the radius of the matching arc surface (20) is the same as the inner diameter of the positioning ring (2).

7. The headstock for a lathe of claim 1, wherein: The bottom of the positioning ring (2) is symmetrically provided with two mounting through holes (18), and the clamping plates of the sliding support (1) are fixedly connected after the mounting through holes (18) are penetrated by bolts, and a reinforcing plate (22) is welded at the bottom of each clamping plate of the sliding support (1).

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