CN113059202B

CN113059202B - Center assembly

Info

Publication number: CN113059202B
Application number: CN202110340061.2A
Authority: CN
Inventors: 虞荣华; 陈宝华; 邱海燕
Original assignee: Beiping Machine Tool Zhejiang Co ltd
Current assignee: Beiping Machine Tool Zhejiang Co ltd
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2022-06-10
Anticipated expiration: 2041-03-30
Also published as: CN113059202A

Abstract

The invention provides a centre assembly, and belongs to the technical field of machinery. It has solved the current not good problem of top structural stability. The center assembly comprises a center shaft, a center seat and a driving mechanism for driving the center seat to translate back and forth, wherein the side wall of the front end of the center shaft is a first conical surface, a strip-shaped groove penetrating through the center seat from front to back is formed in the center seat, the top end of the strip-shaped groove is open, the upper part of the center seat is divided into two connecting blocks arranged in parallel from left to right by the strip-shaped groove, the two connecting blocks are fixedly connected through a bolt penetrating through the strip-shaped groove, and the axis of the bolt extends from left to right; the strip-shaped groove is composed of an upper groove and a lower groove which are both straight strip-shaped and communicated, the lower groove is used for a bolt to pass through, the cross section of the upper groove is an arc, the arc length of the arc is more than half of the circumference of a circle where the arc is positioned, the center shaft is arranged in the upper groove, the side wall of the center shaft is matched with and attached to the inner wall of the strip-shaped groove, and the front end of the center shaft extends out of the upper groove; the top tip seat is also provided with a limiting part for limiting the back movement of the top tip shaft. This top subassembly stable in structure.

Description

Center assembly

Technical Field

The invention belongs to the technical field of machinery, and relates to a machine tool accessory, in particular to a centre assembly.

Background

The centre is often used for assisting the great axle type part of processing axial dimension, and part axial dimension is too big, because the existence of great radial cutting force, makes axle type part produce the runout, can't process. When a part is machined by a machine tool, in order to improve the clamping reliability of the part, one end of the machined part is clamped by a main spindle box chuck, and the other end of the machined part is propped by a tip.

The existing centre is generally divided into a fixed centre and a rotary centre, wherein a centre shaft in the fixed centre is generally fixedly connected through a conical surface or a bolt, the two positioning modes are all axial upper limiting centre shafts, and the centre shafts are easy to wear or loosen at limiting positions under long-term use due to certain vibration when jacking workpieces, so that the working stability is influenced.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provide a centre assembly with stable structure.

The purpose of the invention can be realized by the following technical scheme: a centre assembly comprises a centre shaft, a centre seat and a driving mechanism for driving the centre seat to translate back and forth, wherein the side wall of the front end of the centre shaft is a first conical surface; the strip-shaped groove is composed of an upper groove and a lower groove which are both straight strip-shaped and communicated, the lower groove is used for a bolt to pass through, the cross section of the upper groove is an arc, the arc length of the arc is more than half of the circumference of a circle where the arc is located, the center shaft is arranged in the upper groove, the side wall of the center shaft is matched with and attached to the inner wall of the strip-shaped groove, and the front end of the center shaft extends out of the upper groove; the top tip seat is also provided with a limiting part for limiting the back movement of the top tip shaft.

When the device is used, the front end of the center shaft is pressed on a workpiece so as to support and position the workpiece.

The upper groove with the arc length of the cross section larger than a semicircle is used for wrapping the center shaft, so that the movement of the center shaft is limited in the four directions of up, down, left and right, and the positioning stability of the center shaft is improved.

The axis of the bolt used for contracting the two connecting blocks is extended left and right, namely the axis of the bolt is perpendicular to the axis of the center shaft, so that the influence of the vibration transmitted from the center shaft on the bolt is weakened, the bolt is ensured to be always in a screwing state, the center shaft is always wrapped and positioned in the upper groove, and the structure stability is better, and the working stability is improved.

In the center assembly, the limiting part comprises a positioning block fixed on the rear side of the center seat, and the rear end of the center shaft and the two connecting blocks are tightly pressed on the positioning block. Adopt above-mentioned design, the locating piece not only is used for spacing apex axle, and the friction that produces through connecting block and locating piece counterbalance moreover can further restrict two locating pieces and keep away from each other, further strengthens the stability that the apex axle was fixed a position, when improving structural stability, the locating piece still possesses the dual-purpose effect of an thing to improve the equipment convenience through simplifying the structure.

In the centre assembly, the side wall of the rear end of the centre shaft is a second conical surface, the diameter of the second conical surface is gradually reduced from front to back, a conical hole matched with the second conical surface is formed in the positioning block, and the second conical surface abuts against the wall of the conical hole. The locating block and the center shaft are matched by the taper hole and the taper surface II, so that the right movement of the center shaft can be effectively limited, the center shaft is further limited in other directions by a taper hole wrapping mode, the locating effect of the center shaft is further enhanced, and the working stability is improved.

In the tip assembly, the lower groove is composed of a first groove and a second groove which are both in a straight strip shape, the first groove is positioned between the upper groove and the second groove, the upper side and the lower side of the first groove are respectively communicated with the upper groove and the second groove, the cross section of the first groove is rectangular, the length of the cross section extends up and down, and the cross section of the second groove is in an arc shape. By adopting the design, the two connecting blocks are separated conveniently so that the center shaft can be put in.

As another scheme, in the center assembly, the limiting member is an L-shaped baffle plate, the baffle plate is composed of a first plate and a second plate, the first plate is horizontally arranged, the second plate is vertically arranged, the first plate is located above the center seat and pressed on the center shaft, the second plate is fixedly connected with the center seat, and the rear end of the center shaft is tightly pressed on the second plate.

In above-mentioned top subassembly, actuating mechanism includes the bottom plate of level setting and is used for driving the driving piece of bottom plate translation from beginning to end, and the slip is provided with the base around on the bottom plate, and the base passes through the locking piece spacing in sliding position, and the top seat is fixed on the base. The base can the back-and-forth movement, can adjust the apex axle position more freely, increases application scope, and the practicality is stronger.

In the centre assembly, the bottom plate is provided with a sliding groove which penetrates through the front and the back and has an inverted T-shaped cross section, a sliding block which is matched with the sliding groove and is in the inverted T shape is arranged in the sliding groove, a connecting hole which is right opposite to the sliding groove vertically penetrates through the base, the upper end of the rod part of the sliding block extends out of the sliding groove and penetrates through the connecting hole, the locking piece comprises a nut which is screwed outside the upper end of the rod part, the nut is tightly pressed on the top wall of the base, and the head part of the sliding block is tightly pressed on the inner wall of the sliding groove. The slider both acts as the gliding guide piece of base, acts as the locking piece of locking base again, possesses the dual-purpose effect of an thing to through simplified structure, improve the equipment convenience.

In foretell top subassembly, the left side and the right side of base are all vertically fixed with the guide vane, and two guide vanes paste respectively on the left side and the right side of bottom plate to remove to the base and play better direction, do benefit to the base and adjust.

As another scheme, in the center assembly, the base plate is fixed with slide rails arranged in front and back, the locking member includes a slide block which is slidably disposed on the slide rails and has a locking function, and the slide block is fixedly connected with the base.

Compared with the prior art, the center assembly has the following advantages:

1. the axis of the bolt used for contracting the two connecting blocks is extended left and right, namely the axis of the bolt is perpendicular to the axis of the center shaft, so that the influence of the vibration transmitted from the center shaft on the bolt is weakened, the bolt is ensured to be always in a screwing state, the center shaft is always wrapped and positioned in the upper groove, and the structure stability is better, and the working stability is improved.

2. The locating piece not only is used for spacing apex axle, and the friction that produces through connecting block and locating piece counterbalance moreover can further restrict two locating pieces and keep away from each other, further strengthens the stability that the apex axle was fixed a position, when improving structural stability, the locating piece still possesses the dual-purpose effect of a thing to improve the equipment convenience through simplifying the structure.

Drawings

Fig. 1 is a perspective view of a tip assembly.

Fig. 2 is a rear view of the tip assembly with the tip shaft and the locating block removed.

Fig. 3 is a schematic cross-sectional view of the tip assembly.

Fig. 4 is an enlarged schematic view of a structure at a in fig. 3.

In the figure, 1, a tip shaft; 1a, a first conical surface; 1b, a second conical surface; 2. a tip seat; 2a, a strip-shaped groove; 2a1, upper groove; 2a2, lower groove; 2b, connecting blocks; 3. a bolt; 4. positioning blocks; 4a, a taper hole; 5. a base plate; 5a, a chute; 6. a drive member; 7. a base; 8. a guide block; 9. a slider; 10. a nut; 11. and a guide sheet.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, the present tip assembly includes a tip shaft 1, a tip seat 2, and a driving mechanism for driving the tip seat 2 to translate back and forth.

As shown in fig. 1 and 4, the front end side wall of the tip shaft 1 is a conical surface one 1a, and the diameter of the conical surface one 1a gradually increases from front to back; the side wall of the rear end of the tip shaft 1 is a second conical surface 1b, and the diameter of the second conical surface 1b gradually decreases from front to back.

As shown in fig. 1 and 2, be equipped with the strip groove 2a that runs through around on the top seat 2, strip groove 2a open-top, at this moment, two connecting blocks 2b that set up side by side about the upper portion share of top seat 2 is divided into with strip groove 2a, and two connecting blocks 2b link firmly through the bolt 3 that passes strip groove 2a, and the extension is controlled to 3 axes of bolt. The axis of the bolt 3 used for contracting the two connecting blocks 2b is extended left and right, namely the axis of the bolt 3 is vertical to the axis of the center shaft 1, so that the influence of the vibration transmitted from the center shaft 1 on the bolt 3 is weakened, the bolt 3 is ensured to be always in a screwing state, the center shaft 1 is always wrapped and positioned in the strip-shaped groove 2a, and the structural stability is better, and the working stability is improved.

In the present embodiment, the bolt 3 is mounted as follows: the bolt hole that runs through about being equipped with on one of them connecting block 2b, it has just to the screw hole of bolt hole to run through on another connecting

block

2b, and 3 pole portions of bolt pass bolt hole and bar groove 2a in proper order and revolve in the screw hole, and 3 heads of bolt sticiss on the bolt hole inner wall. Preferably, the number of the bolts 3 is 2 and the bolts are distributed along the front-rear direction, and at the moment, the number of the bolt holes and the number of the threaded holes are 2 and the positions of the bolt holes and the threaded holes correspond to the two bolts 3 respectively.

As shown in fig. 1 and 2, the strip-shaped groove 2a is composed of an upper groove 2a1 and a lower groove 2a2, both of which are straight and communicate with each other. The cross section of the upper groove 2a1 is an arc, and the arc length of the arc is greater than half of the circumference of the circle where the arc is located; the lower groove 2a2 is used for the bolt 3 to pass through, and further, the lower groove 2a2 is composed of a first groove and a second groove which are both straight strip-shaped, the first groove is positioned between the upper groove 2a1 and the second groove, the upper side and the lower side of the first groove are respectively communicated with the upper groove 2a1 and the second groove, the cross section of the first groove is rectangular, the length of the cross section extends up and down, the cross section of the second groove is arc-shaped, and at the moment, the bolt 3 passes through the first groove.

The center shaft 1 is arranged in the upper groove 2a1, the side wall of the center shaft 1 is matched with and attached to the inner wall of the strip-shaped groove 2a, and the front end of the center shaft 1 extends out of the upper groove 2a 1; the tip seat 2 is also provided with a limiting part for limiting the backward movement of the tip shaft 1. When the device is used, the front end of the center shaft 1 is pressed on a workpiece so as to support and position the workpiece.

Specifically, as shown in fig. 1 and 4, the limiting member includes a positioning block 4 fixed to the rear side of the tip seat 2, and the rear end of the tip shaft 1 and the two connecting blocks 2b are pressed against the positioning block 4. Adopt above-mentioned design, locating piece 4 not only is used for spacing apical axis 1, and the friction that offsets through connecting block 2b and locating piece 4 and produce moreover can further restrict two locating pieces 4 and keep away from each other, further strengthens the stability that apical axis 1 was fixed a position, when improving structural stability, locating piece 4 still possesses the dual-purpose effect of a thing to improve the equipment convenience through simplifying the structure. Further, the positioning block 4 is provided with a taper hole 4a matched with the taper surface II 1b, and the taper surface II 1b abuts against the hole wall of the taper hole 4 a. The locating piece 4 and the apical axis 1 are matched by the conical hole 4a and the conical surface II 1b, so that the apical axis 1 can be effectively limited to move rightwards, and the apical axis 1 is further limited in other directions by the conical hole 4a in a wrapping mode, so that the locating effect of the apical axis 1 is further enhanced, and the working stability is improved. In this embodiment, the positioning block 4 is preferably fixedly connected with the tip seat 2 through a screw.

The driving mechanism comprises a bottom plate 5 and a driving piece 6, wherein the bottom plate 5 is horizontally arranged, the driving piece 6 is used for driving the bottom plate 5 to move back and forth, a base 7 is arranged on the bottom plate 5 in a front-back sliding mode, the base 7 is limited in a sliding position through a locking piece, and the tip seat 2 is fixed on the base 7. The base 7 can move back and forth, the position of the center shaft 1 can be adjusted more freely, the application range is enlarged, and the practicability is high.

Wherein the content of the first and second substances,

the driving part 6 is a cylinder or an oil cylinder, and a piston rod of the cylinder or the oil cylinder is connected with the bottom plate 5. During actual use, the bottom plate 5 is further provided with a guide block 8, a machine tool base is correspondingly provided with a guide rail, and the guide rail is arranged on the guide rail so as to improve the sliding precision of the bottom plate 5.

As shown in fig. 3, the base 7 and the bottom plate 5 are slidably connected as follows: run through and the transversal spout 5a that personally submits the shape of falling T around being equipped with on bottom plate 5, be equipped with in the spout 5a and match with this spout 5a and be the slider 9 of the shape of falling T, the vertical through has just to the connecting hole of spout 5a on the base 7, the pole portion upper end of slider 9 stretches out spout 5a and passes the connecting hole, the locking piece includes the nut 10 of spiro union outside pole portion upper end, nut 10 sticiss on the base 7 roof, 9 heads of slider sticiss on spout 5a inner wall. The slider 9 serves as both a guide for sliding the base 7 and a locking member for locking the base 7, and has a dual-purpose effect to improve the convenience of assembly by simplifying the structure. Further, the left side and the right side of the base 7 are both vertically fixed with guide vanes 11, and the two guide vanes 11 are respectively attached to the left side and the right side of the bottom plate 5, so that the base 7 can be better guided to move, and the adjustment of the base 7 is facilitated.

Example two

The second embodiment is basically the same as the first embodiment in structure and principle, and the difference lies in: the locating part is the baffle that is L shape, and the baffle comprises the board one that the level set up and the board two of vertical setting, and board one is in the top of apical plate seat 2 top and presses on apical plate axle 1, and board two links firmly with apical plate seat 2, and the rear end of apical plate axle 1 sticiss on board two.

EXAMPLE III

The structure and principle of the third embodiment are basically the same as those of the first embodiment, and the differences are that: the bottom plate 5 is fixed with slide rails arranged in the front and back, the locking piece comprises a slide block 9 which is arranged on the slide rails in a sliding mode and has a locking function, and the slide block 9 is fixedly connected with the base 7.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. A centre assembly comprises a centre shaft (1), a centre seat (2) and a driving mechanism for driving the centre seat (2) to move back and forth, wherein the side wall of the front end of the centre shaft (1) is a conical surface I (1a), and the centre assembly is characterized in that a strip-shaped groove (2a) which runs through from front to back is formed in the centre seat (2), the top end of the strip-shaped groove (2a) is open, the strip-shaped groove (2a) divides the upper part of the centre seat (2) into two connecting blocks (2b) which are arranged in parallel from left to right, the two connecting blocks (2b) are fixedly connected through bolts (3) which penetrate through the strip-shaped groove (2a), and the axis of each bolt (3) extends from left to right; the bolt-free bolt fastening device is characterized in that the strip-shaped groove (2a) is composed of an upper groove (2a1) and a lower groove (2a2), the upper groove (2a 3878) and the lower groove (2a 3832) are straight and communicated, the bolt (3) passes through the lower groove (2a2), the cross section of the upper groove (2a1) is an arc, the arc length of the arc is larger than half of the circumference of a circle where the arc is located, the tip shaft (1) is arranged in the upper groove (2a1), the side wall of the tip shaft (1) is matched and attached to the inner wall of the strip-shaped groove (2a), and the front end of the tip shaft (1) extends out of the upper groove (2a 1); the center seat (2) is also provided with a limiting piece for limiting the rear movement of the center shaft (1); the limiting part comprises a positioning block (4) fixed on the rear side of the center seat (2), and the rear end of the center shaft (1) and the two connecting blocks (2b) are tightly pressed on the positioning block (4).

2. The center assembly according to claim 1, wherein the rear end side wall of the center shaft (1) is a second conical surface (1b), the diameter of the second conical surface (1b) gradually decreases from front to back, a conical hole (4a) matched with the second conical surface (1b) is formed in the positioning block (4), and the second conical surface (1b) abuts against the wall of the conical hole (4 a).

3. The tip assembly according to claim 1 or 2, wherein the lower groove (2a2) is formed by a first groove and a second groove which are both straight-bar-shaped, the first groove is positioned between the upper groove (2a1) and the second groove, the upper side and the lower side of the first groove are respectively communicated with the upper groove (2a1) and the second groove, the cross section of the first groove is rectangular, the length of the cross section extends up and down, and the cross section of the second groove is circular arc-shaped.

4. The tip assembly according to claim 1, wherein the driving mechanism comprises a horizontally arranged bottom plate (5) and a driving member (6) for driving the bottom plate (5) to move back and forth, the bottom plate (5) is provided with a base (7) in a back and forth sliding manner, the base (7) is limited in a sliding position through a locking member, and the tip seat (2) is fixed on the base (7).

5. The center assembly according to claim 4, wherein the bottom plate (5) is provided with a sliding groove (5a) which penetrates through the front and back and has an inverted T-shaped cross section, a sliding block (9) which is matched with the sliding groove (5a) and has an inverted T shape is arranged in the sliding groove (5a), a connecting hole which is opposite to the sliding groove (5a) is vertically penetrated through the base (7), the upper end of the rod part of the sliding block (9) extends out of the sliding groove (5a) and penetrates through the connecting hole, the locking part comprises a nut (10) which is screwed outside the upper end of the rod part, the nut (10) is tightly pressed on the top wall of the base (7), and the head part of the sliding block (9) is tightly pressed on the inner wall of the sliding groove (5 a).

6. The tip assembly according to claim 5, wherein the guide vanes (11) are vertically fixed to both left and right sides of the base (7), and the guide vanes (11) are attached to the left and right sides of the base plate (5), respectively.

7. The centre assembly according to claim 4, wherein the base plate (5) is fixed with slide rails arranged in a front-back manner, the locking member comprises a slide block (9) which is slidably arranged on the slide rails and has a locking function, and the slide block (9) is fixedly connected with the base (7).