Central bracket for processing screw rod

Abstract

A center support for machining a screw comprises a workbench, a driving seat fixedly arranged on the left portion of the workbench and a tailstock slidably arranged on the right portion of the workbench, a positioning chuck and a tip are arranged on the opposite sides of the driving seat and the tailstock respectively and used for positioning the two ends of the screw, and a support assembly is arranged in the middle of the workbench and comprises a base and an upper cover. The lower portion of the base is in sliding fit with the sliding rail and limited in the horizontal direction through a locking plate, an upper groove and a lower groove are machined in the connecting position of the upper cover and the base to define a circular inner cavity, an upper limiting bolt is installed in the middle of the upper groove in the radial direction, an upper pressing rod is arranged at the lower end of the upper limiting bolt, and a lower ejector rod is installed in the lower groove in the radial direction. The end portions of the lower ejector rods and the end portions of the upper pressing rods abut against the surface of the screw rod. According to the structure, the support assembly is additionally arranged to support the screw, the position of the support assembly can be adjusted, it is guaranteed that the long screw cannot shake in the machining process, the overall structure is stable, and the machining precision is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of center support of processing screw rod. BACKGROUND

[0002] Extrusion molding equipment mainly includes two major parts of main machine and auxiliary machine. Main machine is composed of extrusion system screw rod, cylinder, feeding device etc. Screw rod is the heart of extruder, and has a very important influence on the quality and output of extruder product. The main function of a screw rod is to transport material, heat plasticized material and mix and homogenize material. The processing of screw rod adopts double-positioning structure at both ends, and the screw rod needs to be processed at both ends after thread processing. When the length of screw rod is relatively long, the screw rod is prone to shaking due to uneven stress during processing at one end, which affects the processing precision. SUMMARY

[0003] In view of the deficiencies in the above problems, the utility model provides a kind of center support of processing screw rod.

[0004] To achieve the above object, the utility model provides a kind of center support of processing screw rod, including workbench, the drive seat of being fixed in the left part of the workbench, the tailstock of being slidably arranged in the right part of the workbench, the opposite sides of the drive seat and the tailstock are respectively provided with positioning chuck and center for positioning both ends of screw rod, the middle part of the workbench is equipped with support assembly, the lower part of the support assembly is slidably connected with the workbench through slide rail, and the screw rod passes through the center of the support assembly;

[0005] The support assembly includes base and upper cover, the lower part of the base is slidably connected with the slide rail and is limited in horizontal direction by locking plate, the connecting part of the upper cover and the base is respectively machined upper groove and lower groove to form circular inner cavity, the upper limit bolt is installed in the middle part of the upper groove in radial direction, the upper pressing rod is fixed at the lower end of the upper limit bolt, the lower jack is installed in the lower groove in radial direction, two groups of lower jacks are correspondingly arranged in front and back, the included angle between the lower jacks is less than 180°, and the end of the lower jack and the upper pressing rod abuts against the surface of the screw rod.

[0006] As a further improvement of the utility model, the right end of the upper cover is hingedly connected with the base through pin shaft, and the front end of the upper cover is connected and positioned with the base through first locking bolt.

[0007] As a further improvement of the utility model, the front side of the upper part of the base is machined with side opening, the front end of the upper cover is machined with U-shaped clamping groove, the lower end of the first locking bolt extends into the side opening and is rotatably connected with the base through pivot, and the upper end of the first locking bolt is locked through nut after passing through the U-shaped clamping groove.

[0008] As a further improvement of the utility model, the slide rail is provided with two parallel slide rails, a guide groove is formed between the slide rails, the locking plate is slidably arranged in the guide groove, a second locking bolt is fixedly arranged on the upper portion of the locking plate, a through hole is formed in the middle portion of the base, and the second locking bolt extends into the through hole from bottom to top and is locked by a nut.

[0009] As a further improvement of the utility model, a threaded hole I is radially formed in the middle portion of the upper cover and matches the upper limiting bolt.

[0010] As a further improvement of the utility model, a guide hole is formed on the inner wall of the lower groove in correspondence with the front and rear, the lower top rod is slidably arranged in the guide hole, a threaded hole is formed at the outer end of the guide hole and a lower limiting bolt is arranged in the threaded hole, the end portion of the lower limiting bolt abuts against the lower top rod, a key groove is axially formed on the right side of the lower top rod, a clamping screw is radially arranged on the inner wall surface of the guide hole, and the end portion of the clamping screw extends into the key groove and clamps the lower top rod.

[0011] As a further improvement of the utility model, the end of the lower top rod towards the center of the lower groove is formed with a circular arc surface which matches the circumferential surface of the screw rod, and the distance of the circular arc surface along the length direction of the screw rod is greater than the width of the two screw ridges.

[0012] The utility model discloses the beneficial effects are:

[0013] The structure is supported by the bracket assembly, the position of the bracket assembly can be adjusted, the length of the screw rod is not shaken in the processing, the overall structure is stable, and the processing precision is high. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the front view of the center support of the utility model for processing screw rod;

[0015] Figure 2 It is the front view of the center support of the utility model for processing screw rod; Figure 1 It is the front view of the center support of the utility model for processing screw rod;

[0016] Figure 3 It is the side view of the bracket assembly 5;

[0017] Figure 4 It is the front view of the center support of the utility model for processing screw rod; Figure 3 It is the front view of the center support of the utility model for processing screw rod;

[0018] Figure 5A schematic view of the structure of the lower top rod 53.

[0019] Fig. 1, workbench; 2, driving seat; 21, positioning chuck; 3, slide rail; 31, guide groove; 4, screw rod; 5, support assembly; 51, base; 511, through hole; 512, lower groove; 513, guide hole; 514, threaded hole; 515, side opening; 52, lower limiting bolt; 53, lower top rod; 531, key groove; 532, circular arc surface; 54, upper cover; 541, upper groove; 542, threaded hole I; 543, U-shaped clamping groove; 55, upper limiting bolt; 551, upper pressing rod; 56, first locking bolt; 57, locking plate; 58, second locking bolt; 59, locking screw; 6, tail seat; 61, center. DETAILED DESCRIPTION

[0020] As Figures 1-3 shown, the utility model discloses a kind of center supports of processing screw rod, including workbench 1, the driving seat 2 being fixed in the left part of workbench 1, the tail seat 6 being slidably arranged in the right part of workbench 1, the opposite side of driving seat 2 and tail seat 6 is respectively equipped with positioning chuck 21 and center 61 for positioning the both ends of screw rod 4, the middle part of workbench 1 is equipped with support assembly 5, the lower part of support assembly 5 is slidably connected with workbench 1 by slide rail 3, screw rod 4 passes through the center of support assembly 5, slide rail 3 is equipped with two parallel, guide groove 31 is formed between slide rail 3, locking plate 57 is slidably arranged in guide groove 31, second locking bolt 58 is fixed on the upper part of locking plate 57, through hole 511 is formed in the middle part of base 51, and second locking bolt 58 is inserted into through hole 511 from bottom to top and locked by nut;

[0021] The bracket assembly 5 comprises a base 51, an upper cover 54, the right end of the upper cover 54 is hinged to the base 51 through a pin shaft, the front end of the upper cover 54 is connected and positioned to the base 51 through a first locking bolt 56, the upper part of the front side of the base 51 is processed with a side opening 515, the front end of the upper cover 54 is processed with a U-shaped clamping groove 543 in correspondence, the lower end of the first locking bolt 56 extends into the side opening 515 and is rotationally connected to the base 51 through a rotating shaft, the upper end of the first locking bolt 56 passes through the U-shaped clamping groove 543 and is locked through a nut, the lower part of the base 51 is slidingly matched with the slide rail 3 and is limited in the horizontal direction by using a locking plate 57, the connection part of the upper cover 54 and the base 51 is respectively processed with an upper groove 541 and a lower groove 512 to enclose a circular inner cavity, the middle part of the upper groove 541 is radially installed with an upper limiting bolt 55, the middle part of the upper cover 54 is radially processed with a threaded hole I 542 matched with the upper limiting bolt 55, the lower end of the upper limiting bolt 55 is fixedly provided with an upper pressing rod 551, the lower groove 512 is radially installed with a lower ejector rod 53, the lower ejector rod 53 is provided with two groups in correspondence in front and back, the included angle between the lower ejector rods 53 is less than 180°, the end parts of the lower ejector rod 53 and the upper pressing rod 551 abut against the surface of the screw rod 4, the inner wall of the lower groove 512 is processed with guiding holes 513 in correspondence in front and back, the lower ejector rod 53 is slidingly arranged in the guiding hole 513, the outer end of the guiding hole 513 is processed with a threaded hole 514 and is installed with a lower limiting bolt 52, the end part of the lower limiting bolt 52 abuts against the lower ejector rod 53, the right side of the lower ejector rod 53 is axially processed with a key groove 531, the inner wall surface of the guiding hole 513 is radially installed with a clamping screw 59, the end part of the clamping screw 59 extends into the key groove 531 and clamps the lower ejector rod 53, the end part of the lower ejector rod 53 towards the center of the lower groove 512 is processed with a circular arc surface 532 matched with the circumferential surface of the screw rod 4, the distance of the circular arc surface 532 along the length direction of the screw rod 4 is greater than the width of the two screw ridges (see Figure 4 , Figure 5 )。

[0022] The structure supports the screw rod through the added bracket assembly, the position of the bracket assembly is adjustable, the length of the screw rod is ensured not to shake in the machining process, the overall structure is stable, and the machining precision is high; the lower ejector rod and the upper pressing rod in the bracket assembly support the screw rod, the lower ejector rod and the upper pressing rod form a triangular supporting structure, the radial positions of the lower ejector rod and the upper pressing rod are adjustable, the bracket assembly is suitable for screw rods with different diameters, and the universality is good; the end part of the lower ejector rod in contact with the screw rod is processed with a circular arc surface in cooperation, the contact area between the lower ejector rod and the screw rod is effectively increased, the supporting structure is more stable, and the screw rod surface is not easy to scratch.

[0023] In specific use, for the convenience of understanding the utility model, the description is made in combination with the drawings:

[0024] The scheme in the embodiment is mainly used when the screw is processed near the two ends; during work, the upper cover is first in an open state, the lower top rod with the arc surface matched with the surface of the screw is selected, the two ends of the screw are positioned through the positioning chuck and the center, the support assembly is moved to the specified position and positioned through the locking plate and the second locking bolt, the position of the lower top rod is adjusted so that the arc surface of the lower top rod is attached to the surface of the screw (as long as the lower limiting bolt is rotated, the lifting force of the lower limiting bolt is slid along the guide hole, and after being positioned, the limiting screw is tightened), then the upper cover is covered, the upper cover and the base are locked through the first locking bolt, the position of the upper limiting bolt is adjusted so that the upper pressing rod is abutted against the surface of the screw, and the lower top rod and the upper pressing rod are cooperated to jointly support the screw.

[0025] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be variously modified and changed. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A center support for machining a screw rod, characterized by: It includes workbench (1), drive seat (2) fixed to the left part of the workbench (1), tailstock (6) slidingly arranged on the right part of the workbench (1), the opposite sides of the drive seat (2) and the tailstock (6) are respectively provided with positioning chuck (21) and tail center (61) for positioning the two ends of screw rod (4), the middle part of the workbench (1) is provided with support assembly (5), the lower part of the support assembly (5) is connected with the workbench (1) through slide rail (3) to form sliding connection, the screw rod (4) passes through the center of the support assembly (5); The support assembly (5) includes base (51) and upper cover (54), the lower part of the base (51) is slidingly matched with the slide rail (3) and is limited in horizontal direction by locking plate (57), the connecting part of the upper cover (54) and the base (51) is respectively processed with upper groove (541) and lower groove (512) to form circular inner cavity, the middle part of the upper groove (541) is radially installed with upper limiting bolt (55), the lower end of the upper limiting bolt (55) is fixedly provided with upper pressing rod (551), the lower groove (512) is radially installed with lower ejector rod (53), the lower ejector rod (53) is provided with two groups corresponding to front and back, the included angle between the lower ejector rod (53) is less than 180°, the end of the lower ejector rod (53) and the upper pressing rod (551) abuts against the surface of the screw rod (4).

2. A center support for a processing screw as defined in claim 1, wherein: The right end of the upper cover (54) is hinged with the base (51) through pin shaft, the front end of the upper cover (54) is connected and positioned with the base (51) through first locking bolt (56).

3. A center support for a processing screw as defined in claim 2 wherein: The front side of the upper part of the base (51) is processed with side opening (515), the front end of the upper cover (54) is correspondingly processed with U-shaped clamping groove (543), the lower end of the first locking bolt (56) extends into the side opening (515) and is rotationally connected with the base (51) through rotating shaft, the upper end of the first locking bolt (56) passes through the U-shaped clamping groove (543) and is locked by nut.

4. A center support for a processing screw as defined in claim 1, wherein: The slide rail (3) is provided with two parallel slide rails, the slide rail (3) forms guide groove (31) between the two slide rails, the locking plate (57) is slidingly arranged in the guide groove (31), the upper part of the locking plate (57) is fixedly provided with second locking bolt (58), the middle part of the base (51) is processed to form through hole (511), the second locking bolt (58) extends into the through hole (511) from bottom to top and is locked by nut.

5. A center support for a processing screw as defined in claim 1 wherein: The middle part of the upper cover (54) is radially processed with thread hole I (542) matched with the upper limiting bolt (55).

6. A center support for a processing screw as defined in claim 1, wherein: Corresponding guide holes (513) are processed on the inner wall of the lower groove (512), the lower ejector rod (53) is slidably arranged in the guide hole (513), a threaded hole (514) is formed at the outer end of the guide hole (513) and a lower limiting bolt (52) is installed, the end of the lower limiting bolt (52) abuts against the lower ejector rod (53), a key groove (531) is processed on the right side of the lower ejector rod (53) in the axial direction, a tight screw (59) is installed on the inner wall of the guide hole (513) in the radial direction, the end of the tight screw (59) extends into the key groove (531) and the lower ejector rod (53) is tightly pressed.

7. A center support for a processing screw as defined in claim 1 wherein: The end of the lower ejector rod (53) towards the center of the lower groove (512) is processed with a circular arc surface (532) matched with the circumferential surface of the screw rod (4), and the distance of the circular arc surface (532) along the length direction of the screw rod (4) is greater than the width of two screw ridges.

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