CN210790538U

CN210790538U - Tensioning mechanism of rear-pull main shaft

Info

Publication number: CN210790538U
Application number: CN201921934556.2U
Authority: CN
Inventors: 赵玉松; 赵君; 赵希扩
Original assignee: Anyang Deyi Machine Tool Accessory Manufacturing Co ltd
Current assignee: Anyang Deyi Machine Tool Accessory Manufacturing Co ltd
Priority date: 2019-11-11
Filing date: 2019-11-11
Publication date: 2020-06-19
Anticipated expiration: 2029-11-11

Abstract

The utility model provides a straining device of back-pull main shaft, including main shaft and emery wheel pole, processing has the bell mouth that holds the emery wheel pole conical surface on the preceding terminal surface of main shaft, the centre bore has been seted up at the main shaft center, a cavity has been seted up on the emery wheel pole rear end face, the rear end of cavity has radial inside protruding fender, the pull rod is close to the front portion and has a little preceding big conical surface in back, the front end an organic whole of conical surface is provided with the locating surface, wear to be equipped with the spring claw that expands on the pull rod, the front end of the spring claw that expands has radial outside protruding claw, protruding claw is located the protruding fender front portion of cavity, wear to be equipped with the dish spring on the pull rod at spring claw rear portion, wear to be equipped with the preceding position sleeve on the pull rod at dish spring rear portion, the back end processing of pull rod is equipped with the screw thread, the screw thread. The tensioning mechanism has simple structure and low cost.

Description

Tensioning mechanism of rear-pull main shaft

Technical Field

The utility model relates to a back draw location main shaft, in particular to straining device of back draw main shaft belongs to main shaft technical field.

Background

The rear-pull spindle positioning main shaft is a tensioning and positioning mode in the main shaft, which is more common on the high-precision spindle but is difficult to realize on the spindle with general precision requirements, for example, the rear-pull spindle is applied to a high-precision CNC grinding machine, the front end surface of the main shaft is provided with a tapered hole 17, the rear end of an abrasive wheel rod is provided with a tapered surface 15 matched with the tapered hole, an end surface 16 is integrally connected with the tapered surface, the tapered hole of the processing main shaft ensures that the gap between the large end of the tapered surface of the abrasive wheel rod and the front end surface 18 of the main shaft is 0.03-0.05, when in positioning, the abrasive wheel rod is tensioned through a tensioning mechanism penetrating through the center of the main shaft, the tapered hole surface of the main shaft and the tapered surface of the abrasive wheel rod, the front end surface of the main shaft and the end surface of the abrasive wheel rod are tightly attached together by virtue of metal ductility, the simultaneous positioning of the end surfaces and, the existing tensioning mechanism capable of meeting the requirement depends on an imported device, the structure of the imported device is complex, the price of the imported device is high (about 4000 rmb/set), important factors of the imported tensioning mechanism, which are that one ceramic sleeve cannot be made into a home and cannot be purchased independently, and the imported tensioning mechanism has to be adopted due to the high accuracy of the grinding machine. Even if the imported tensioning mechanism is adopted, in order to ensure the jumping precision of 0.002mm, when the grinding wheel rod is replaced, the surface of the conical hole and the surface of the grinding wheel rod need to be wiped clean by dust-free cloth, the precision requirement and the realization difficulty are visible, and in view of the high price of the mechanism, the self-development of the mechanism is an effective way for reducing the equipment cost.

Disclosure of Invention

An object of the utility model is to overcome the above-mentioned problem that exists in the straining device of present back-pull main shaft, provide a straining device of back-pull main shaft.

In order to realize the purpose of the utility model, the following technical proposal is adopted: a tensioning mechanism of a back-pull spindle comprises a spindle and a grinding wheel rod, wherein a tapered hole for accommodating a conical surface of the grinding wheel rod is processed on the front end face of the spindle, a center hole is formed in the center of the spindle, the center is concentric and communicated with the tapered hole, a plurality of reducing holes are formed in the center hole, a cavity is formed in the rear end face of the grinding wheel rod, a radially inward convex baffle is arranged at the rear end of the cavity and forms a rear end hole of the grinding wheel rod, a tapered surface with a small back and a large front is arranged near the front of the drawing rod, a positioning surface is integrally arranged at the front end of the tapered surface, a spring expansion claw is arranged on the drawing rod in a penetrating mode and located behind the positioning surface, a radially outward convex claw is arranged at the front end of the spring expansion claw and located in the front part of the convex baffle in the cavity, when the spring expansion claw is in a natural state, the outer diameter of a circle formed by the convex claw is smaller than the inner diameter of the rear end hole, and when the, the rear end of the pull rod is screwed with a tensioning nut, the rear end of the central hole is a diameter-changing hole with a large rear end and a small front end, the pull rod at the front part of the tensioning nut is penetrated with a rear positioning sleeve, the rear part of the rear positioning sleeve is large and small rear end, the front part of the rear positioning sleeve is positioned in a large hole of the diameter-changing hole, the gap between the front part of the rear positioning sleeve and the diameter-changing hole is 0.01-0.02mm, and the gap between the rear positioning sleeve and the pull rod is 0.03-0.05 mm.

Further, the method comprises the following steps of; the clearance between the front locating sleeve and the cavity at the central hole of the main shaft is 0.03-0.05 mm.

Further, the method comprises the following steps of; the clearance between the inner diameter of the spring expansion claw and the pull rod at the position is 0.03-0.05 mm.

Further, the method comprises the following steps of; the connecting surface between the convex block and the cavity is an inclined surface, and the rear end surface of the convex claw is also a corresponding inclined surface.

Further, the method comprises the following steps of; the front end of the inner cavity of the spring expansion claw is provided with a conical chamfer.

The utility model discloses an actively beneficial technological effect lies in: this straining device simple structure, with low costs, single set cost is less than 300 yuan, and is not as late as one tenth of import product, adopts each part when processing reaches corresponding cooperation precision in this mechanism, and concentricity is good when taut, and the atress is even, verifies through using, and the beating that grinding wheel pole 150mm was less than 0.002mm when 360 arbitrary clamps adorn can be satisfied completely to this straining device after taut.

Drawings

FIG. 1 is a schematic cross-sectional view of the present take-up mechanism mounted on a main shaft.

Figure 2 is a schematic cross-sectional view of the grinding wheel spindle of the present tensioning mechanism.

FIG. 3 is a schematic cross-sectional view of the main shaft of the present take-up mechanism.

FIG. 4 is a schematic cross-sectional view of the tension rod of the present tensioning mechanism.

Fig. 5 is a schematic view of the spring expansion claw.

Detailed Description

In order to explain the utility model more fully, the utility model provides an implementation example. These examples are merely illustrative of the present invention and do not limit the scope of the present invention.

The invention is explained in further detail with reference to the drawings, in which the reference symbols are: 1: a main shaft; 2: a grinding wheel lever; 3: a cavity; 4: a convex block; 5: a spring expansion claw; 6: a convex claw; 7: a disc spring; 8: a front positioning sleeve; 9: a pull rod; 10: a conical surface; 11: positioning the surface; 12: a rear positioning sleeve; 13: tightening the nut; 14: the connecting surface between the convex block and the cavity; 15: a conical surface; 16: an end face; 17: a tapered hole; 18: a front end face; 19: macropores; 20: a thread; 21: a central bore.

It should be noted that fig. 5 is a schematic diagram of a principle of a spring expansion claw, and is not a spring expansion claw used in this structure, and this diagram is only a schematic diagram, in this diagram, an inclined plane of a rear end surface of a protruding claw and a tapered chamfer at a front end of an inner cavity of the spring expansion claw are both shown, and a structure of the front end of the inner cavity of the spring expansion claw is not a spring expansion claw structure in this tensioning structure.

As shown in the attached drawing, the tensioning mechanism of the back-pull spindle comprises a spindle 1 and a grinding wheel rod 2, wherein a conical hole 17 for accommodating the conical surface of the grinding wheel rod is processed on the front end surface 18 of the spindle, a central hole 21 is formed in the center of the spindle, the central hole is concentric and communicated with the conical hole 17, a plurality of reducing holes are formed in the central hole, a cavity 3 is formed in the rear end surface of the grinding wheel rod, a radially inward convex block 4 is arranged at the rear end of the cavity, the connecting surface between the convex block and the cavity is an inclined surface, 14 is a connecting surface between the convex block and the cavity, the convex block forms a rear end hole of the grinding wheel rod, a conical surface 10 which is small at the rear and big at the front is arranged near the front part of the drawing rod, a positioning surface 11 is integrally arranged at the front end of the conical surface, a drawing rod 9 is arranged in the central hole in a penetrating manner, a spring expansion claw 5 is arranged on the drawing rod 9 in a penetrating manner, the inner diameter of the spring, the front end of the inner cavity of the spring expansion claw is provided with a conical chamfer, when the spring expansion claw expands to the maximum, the diameter of the inner cavity of the spring expansion claw is smaller than that of the positioning surface, the front end of the spring expansion claw is provided with a convex claw 6 which is outward in the radial direction, the rear end surface of the convex claw is also a corresponding inclined surface, the inclined surface is matched with the connecting surface between the convex stopper and the cavity, the convex claw is positioned at the front part of the convex stopper in the cavity, when the spring expansion claw is in a natural state, the outer diameter of a circle formed by the convex claw is smaller than the inner diameter of a rear end hole, when the spring expansion claw expands, the outer diameter of the circle formed by the convex claw is larger than the inner diameter of the rear end hole, a disc spring 7 penetrates through a pull rod at the rear part of the spring expansion claw, a front positioning sleeve 8 penetrates through the pull rod at the rear part of the disc spring, the gap between the front positioning sleeve and the cavity at the central hole of the main shaft is 0.03-0.05mm, the rear end of the pull rod extends out of the main shaft, the rear part of the pull rod is screwed with a tensioning nut 3, the rear end of the main shaft is provided with a reducing hole with a large rear part and a small front part, the pull rod at the front part of the tensioning nut is penetrated with a rear positioning sleeve 12, the rear part of the rear positioning sleeve is large and the front part of the rear positioning sleeve is positioned in a large hole 19 of the reducing hole, the gap between the front part of the rear positioning sleeve and the reducing hole is 0.01-0.02mm, and the gap between the rear positioning sleeve and the pull rod is 0.03-0.05 mm.

When the tensioning mechanism is assembled, the spring expansion claw, the disc spring and the front positioning sleeve are arranged on the pull rod in a penetrating mode, then the pull rod is arranged in a penetrating mode, the front end of the pull rod penetrates into a cavity in the rear end of the grinding wheel rod, and then the rear positioning sleeve and the tensioning nut are arranged at the rear end of the pull rod in a penetrating mode.

This straining device during operation, the toper of pull rod is to the inside removal of the expanded claw of spring during rotatory taut nut, make the expanded claw of spring open, continue rotatory taut nut, the protruding claw on the expanded claw of spring draws protruding position backward, probably because the elasticity of dish spring and the elastic deformation performance of the expanded claw of spring, the in-process atress that pulls backward is even, so the two location of terminal surface and conical surface are very exquisite, can satisfy 360 degrees arbitrary clamping down the jump of emery wheel pole 150mm play and be less than 0.002 mm's required precision, experimental proof, claw and conical surface do not expand, and cooperation precision and concentricity between the protruding claw three all hardly realize.

After the embodiments of the present invention have been described in detail, those skilled in the art can clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above claims, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention all fall within the scope of the technical solution of the present invention, and the present invention is not limited to the embodiments of the examples given in the specification.

Claims

1. The utility model provides a back tension main shaft's straining device, includes main shaft and emery wheel pole, processing has the bell mouth that holds the emery wheel pole conical surface on the preceding terminal surface of main shaft, has seted up the centre bore at the main shaft center, the center just communicates with each other with the bell mouth is concentric, the centre bore on have many places reducing, its characterized in that: the rear end surface of the grinding wheel rod is provided with a cavity, the rear end of the cavity is provided with a radial inward convex baffle which forms a rear end hole of the grinding wheel rod, the pull rod is provided with a conical surface with a small back and a large front near the front part, the front end of the conical surface is integrally provided with a positioning surface, a spring expansion claw is arranged on the pull rod in a penetrating way, the spring expansion claw is positioned behind the positioning surface, the front end of the spring expansion claw is provided with a radial outward convex claw which is positioned at the front part of the convex baffle in the cavity, when the spring expansion claw is in a natural state, the outer diameter of a circle formed by the convex claw is smaller than the inner diameter of the rear end hole, when the spring expansion claw expands, the outer diameter of the circle formed by the convex claw is larger than the inner diameter of the rear end hole, a disc spring is arranged on the pull rod at the rear part of the spring expansion claw in a penetrating way, a front positioning sleeve is arranged on the pull rod at the rear part of the disc spring, the rear end, the rear end of the pull rod extends out of the main shaft, the rear part of the pull rod is screwed with a tensioning nut, the rear end of the main shaft is provided with a reducing hole with a large rear part and a small front part, the pull rod at the front part of the tensioning nut is penetrated with a rear positioning sleeve, the rear part of the rear positioning sleeve is large and the front part of the rear positioning sleeve is positioned in a large hole of the reducing hole, the gap between the front part of the rear positioning sleeve and the reducing hole is 0.01-0.02mm, and the gap between the rear positioning sleeve and the pull rod is 0.03-0.05 mm.

2. A take-up mechanism for a pullback spindle as claimed in claim 1, wherein: the clearance between the front locating sleeve and the cavity at the central hole of the main shaft is 0.03-0.05 mm.

3. A take-up mechanism for a pullback spindle as claimed in claim 1, wherein: the clearance between the inner diameter of the spring expansion claw and the pull rod at the position is 0.03-0.05 mm.

4. A take-up mechanism for a pullback spindle as claimed in claim 1, wherein: the connecting surface between the convex block and the cavity is an inclined surface, and the rear end surface of the convex claw is also a corresponding inclined surface.

5. A take-up mechanism for a pullback spindle as claimed in claim 1, wherein: the front end of the inner cavity of the spring expansion claw is provided with a conical chamfer.