CN207447908U - A kind of turning attachment for processing circuit breaker base eccentric orfice - Google Patents

Abstract

The utility model discloses a lathe fixture for processing the eccentric hole of the circuit breaker base, which comprises a circular base, a cover plate and a balance weight, and an anti-interference center hole is opened at the rotation center of the base; a short pin is arranged on the base, and a The positioning disc and two balance weights are installed through the hexagon head bolts; when the workpiece is clamped on the lathe fixture, the workpiece is located between the base and the cover plate; after the hexagon head bolts pass through the workpiece and the cover plate, they are connected with the hexagon nuts The fit of the hex head bolts compresses the workpiece against the base. The position aligned by the center of rotation of the base of the utility model is exactly the same as the position of the eccentric hole to be drilled on the base of the standard circuit breaker, so that during processing, the worker only needs to align the drill bit with the center of rotation of the base, press Set the speed and feed rate for drilling, expanding and boring processing, which can meet the processing requirements of parts, with precision and no deviation, and can also realize mass production, which completely solves the processing of eccentric holes in the base of high-voltage AC SF6 circuit breakers problem.

Description

A Lathe Fixture for Machining the Eccentric Hole of the Circuit Breaker Base

technical field

The utility model belongs to the field of circuit breaker base processing fixtures, in particular to a lathe fixture for processing eccentric holes in circuit breaker bases.

Background technique

The base of a standard high-voltage AC SF6 circuit breaker has an eccentric hole of Φ16 and 46mm in depth radially on its surface, but for now, this is still a difficult point in the processing of the circuit breaker base.

When using ordinary machine tools to process manually, the Φ16 deep 46mm eccentric hole adopts the processing method of marking-point hole-drilling-reaming. The processing time of this method is too long, and the accuracy of the Φ16mm eccentric hole cannot meet the requirements. , and the position of the ratchet mounting hole is not easy to accurately control, so the product quality cannot be reliably guaranteed, resulting in a high reject rate and low production efficiency.

When using the automatic machining of the four-axis machining center, it is necessary to complete the processing of the 8×Φ11mm ratchet mounting hole and the Φ16 deep 46mm eccentric hole in one clamping, and then re-clamp, and use the indexing device to mill the U-shaped waist with a width of 17.2mm. The process of this method is relatively concentrated, the product quality can be well guaranteed, and the scrap rate is low, but the product structure is relatively simple, the overall accuracy requirements are not high, and when milling the U-shaped waist, it needs to be re-clamped, which takes up the machine time Long, the production cost is higher.

Utility model content

In view of the above difficulties in processing the base of the high-voltage AC sulfur hexafluoride circuit breaker, the utility model aims to provide a lathe fixture for processing the eccentric hole of the circuit breaker base, so as to realize the precise drilling of the eccentric hole.

In order to achieve the above-mentioned technical purpose and achieve the above-mentioned technical effect, the utility model is realized through the following technical solutions:

A lathe fixture for processing the eccentric hole of the circuit breaker base, which includes a circular base, a cover plate and two balance weights for eliminating vibration caused by unbalanced rotation. The anti-interference center hole where the tool interferes with the base; a long hexagon head bolt hole and a short pin hole are opened on the upper semicircle of the base, and the long hexagon head bolt hole and the short pin hole are located at the The vertical center line of the base, and the long hexagon head bolt hole is located between the anti-interference center hole and the short pin hole; two short hexagon head bolt holes are opened on the lower semicircle of the base. The two short hex head bolt holes are respectively located on both sides of the vertical center line of the base, and are distributed symmetrically;

A short pin for determining the drilling position of the eccentric hole is arranged in the short pin hole, a long hexagon head bolt is arranged in the long hexagon head bolt hole, and a long hexagon head bolt is set on the long hexagon head bolt for Locate the positioning disc at the rear of the circuit breaker base, the positioning disc is fixed on the base by two hexagonal screws, and the front end of the long hexagonal head bolt is provided with threads along the circumferential surface;

The center of the cover plate is provided with a mounting hole through which the front part of the long hex head bolt can pass, and the peripheral surface of the front part of the cover plate is provided with a collar for positioning the front part of the circuit breaker base ;

A short hexagon head bolt is respectively arranged in the two short hexagon head bolt holes, and each of the short hexagon head bolts is sequentially set with the balance weight, a small washer and a small hexagon nut. The front ends of the bolts are provided with threads along the circumferential surface, and the two small hexagon nuts respectively cooperate with the threads on the front of the corresponding short hexagon head bolts to fix the two balance weights on the base;

When the circuit breaker base is clamped on the lathe fixture, the circuit breaker base is set on the base; the short pin is inserted into a ratchet mounting hole of the circuit breaker base, and the long The hex head bolt passes through the inner hole of the circuit breaker base, and the positioning disk is embedded in the inner hole at the rear of the circuit breaker base; on the base, and the flange of the cover plate fits the front part of the circuit breaker base, and the rear part of the cover plate is embedded in the front inner hole of the circuit breaker base; the long The front part of the hexagon head bolt passes through the mounting hole of the cover plate, and is set with a large washer and a large hexagon nut in turn, and the cover plate passes through the threaded connection between the large hexagon nut and the top of the long hexagon head bolt. Cooperate to press the circuit breaker base on the base.

Further, according to the national standard GB/T1801-2009 stipulated in the national standard GB/T1801-2009, the priority and common fit of the base hole system, the fit size of the short pin and the short pin hole is Φ11H7/k6.

Further, according to the national standard GB/T1801-2009, the base hole system priority and common fit, the fit size of the positioning disc and the inner ring at the rear of the circuit breaker base is Φ94.8H7/f6.

Further, according to the national standard GB/T1801-2009, the base hole system priority and common fit, the matching dimension of the rear part of the cover plate and the inner ring of the front part of the circuit breaker base is Φ100H9/d9.

Further, the diameter of the base is 280mm.

Further, the diameter of the anti-interference center hole is Φ17.5mm.

The working principle of the utility model is as follows:

When clamping, first install the positioning disc and the balance weight on the base, then put the circuit breaker base to be processed on the positioning disc, the positioning disc is embedded in the inner hole at the rear of the circuit breaker base, and the balance weight Located under the base of the circuit breaker, the short pin is inserted into a ratchet mounting hole on the base of the circuit breaker, positioned using the positioning disc and the short pin, aligning the part where the eccentric hole needs to be drilled with the anti-interference center hole on the base , and then cover the cover, clamped by a large washer and a large hex nut. During processing, you only need to align the drill bit with the position of the rotation center of the base, and perform drilling, expanding, and boring according to the set speed and feed rate, which can meet the processing requirements of the parts. The anti-interference center hole can prevent the tool from interfering with the base , the balance block is used to eliminate the vibration caused by the unbalanced rotation. After the processing is completed, loosen the large hex nut, open the cover, take out the workpiece, and then put in the next workpiece to realize mass production.

The beneficial effects of the utility model are:

1. The utility model is firstly positioned by short pins and positioning discs, and then pressed by cover plates, large washers and large hexagonal nuts. The accuracy of the parts is controlled by the positioning accuracy of the fixture itself to ensure the processing quality, and the clamping is convenient. Production efficiency is greatly improved.

2. After the utility model clamps the circuit breaker base to be processed, the position of the center of rotation of the base is completely consistent with the position of the Φ16 deep 46mm eccentric hole drilled for the standard circuit breaker base, which makes the During processing, you only need to align the drill bit with the rotation center of the base, and perform drilling, expanding, and boring processing according to the set speed and feed rate, which can meet the processing requirements of the parts, with precision and deviation, and mass production. The anti-interference center hole opened at the center of rotation can prevent the tool from interfering with the base, and the two balance weights can well eliminate the vibration caused by the unbalanced rotation, completely solving the eccentricity of the base of the high-voltage AC SF6 circuit breaker Hole processing problems.

3. The utility model disperses the processing procedures, and separately processes the Φ16 deep 46mm eccentric hole on the circuit breaker base. The processing content is small, and the existing production equipment can be rationally used.

4. The utility model has lower technical requirements for workers, and can adopt the most reasonable cutting amount, reduce maneuvering time, improve production efficiency and reduce production cost.

5. The utility model has simple structure and convenient manufacture. The material used is 45 steel, which has good cutting performance, low manufacturing cost, convenient operation, safety and reliability.

The above description is only an overview of the technical solution of the utility model. In order to understand the technical means of the utility model more clearly and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiment of the utility model with accompanying drawings. back. The specific embodiment of the utility model is given in detail by the following examples and accompanying drawings.

Description of drawings

The drawings described here are used to provide a further understanding of the utility model and constitute a part of the application. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute improper limitations to the utility model. In the attached picture:

Fig. 1 is the assembly diagram of the utility model and the circuit breaker base.

Fig. 2 is the front view of the utility model after removing the cover plate, the large washer and the large hex nut.

Fig. 3 is a cross-sectional view at A-A in Fig. 2 .

Detailed ways

The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in Figures 1-3, a lathe fixture for machining the eccentric hole of the circuit breaker base includes a circular base 1, a cover plate 2 and two balance weights 3 for eliminating vibration caused by unbalanced rotation, The center of rotation of the base 1 is provided with an anti-interference center hole 4 to prevent the tool from interfering with the base 1; the upper semicircle of the base 1 is provided with a long hex head bolt hole and a short pin hole, so Both the long hexagon head bolt hole and the short pin hole are located on the vertical centerline of the base 1, and the long hexagon head bolt hole is located between the anti-interference center hole 4 and the short pin hole; Two short hexagon head bolt holes are opened on the lower semicircle of the base 1, and the two short hexagon head bolt holes are respectively located on both sides of the vertical center line of the base 1, and are symmetrically distributed;

A short pin 5 for determining the drilling position of the eccentric hole is provided in the short pin hole, and a long hexagon head bolt 6 is arranged in the long hexagon head bolt hole, and the long hexagon head bolt 6 is sleeved with A positioning disc 8 for positioning the rear of the circuit breaker base 7, the positioning disc 8 is fixed on the base 1 by two hexagon screws 9, and the front end of the long hex head bolt 6 is arranged along the circumferential surface threaded;

The center of the cover plate 2 is provided with a mounting hole 10 through which the front part of the long hexagon head bolt 6 can pass, and the peripheral surface of the front part of the cover plate 2 is provided with a front collar;

A short hexagon head bolt 11 is respectively arranged in the two short hexagon head bolt holes, and each of the short hexagon head bolts 11 is sequentially set with the balance weight 3, the small washer 12 and the small hexagon nut 14, The front ends of the short hexagon head bolts 11 are provided with threads along the circumferential surface, and the two small hexagon nuts 14 respectively fix the two balance weights 3 by threading the corresponding front parts of the short hexagon head bolts 11. on the base 1;

When the circuit breaker base 7 is clamped on the lathe fixture, the circuit breaker base 7 is set on the base 1; the short pin 5 is inserted into a ratchet mounting hole of the circuit breaker base 7 Among them, the long hex head bolt 6 passes through the inner hole of the circuit breaker base 7, and the positioning disc 8 is embedded in the inner hole at the rear of the circuit breaker base 7; at the same time, the The cover plate 2 is pressed on the circuit breaker base 7, and the collar of the cover plate 2 is attached to the front part of the circuit breaker base 7, and the rear part of the cover plate 2 is embedded in the circuit breaker base 7. In the front inner hole of the circuit breaker base 7; the front part of the long hex head bolt 6 passes through the installation hole 10 of the cover plate 2, and is sequentially set with a large washer 15 and a large hex nut 16, The cover plate 2 presses the circuit breaker base 7 onto the base 1 through the cooperation of the large hex nut 16 and the thread on the top of the long hex head bolt 6 .

Further, according to the national standard GB/T1801-2009 stipulated in the national standard GB/T1801-2009, the base hole system is preferred and commonly used, and the matching size of the short pin 5 and the short pin hole is Φ11H7/k6.

Further, according to the national standard GB/T1801-2009, the base hole system priority and common fit, the matching dimension between the positioning disc 8 and the inner ring at the rear of the circuit breaker base 7 is Φ94.8H7/f6.

Further, according to the national standard GB/T1801-2009, the base hole system priority and common fit, the matching dimension of the rear part of the cover plate 2 and the inner ring of the front part of the circuit breaker base 7 is Φ100H9/d9.

Further, the diameter of the base 1 is 280mm.

Further, the diameter of the anti-interference center hole 4 is Φ17.5mm.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (6)

1. A lathe fixture for processing the eccentric hole of the circuit breaker base, which is characterized in that it includes a circular base (1), a cover plate (2) and two balance weights for eliminating vibration caused by unbalanced rotation (3), there is an anti-interference center hole (4) at the center of rotation of the base (1) to prevent the tool from interfering with the base (1); there is a center hole (4) on the upper semicircle of the base (1) A long hexagon head bolt hole and a short pin hole, both of the long hexagon head bolt hole and the short pin hole are located on the vertical centerline of the base (1), and the long hexagon head bolt hole is located on the anti Interference between the center hole (4) and the short pin hole; two short hexagon head bolt holes are opened on the lower semicircle of the base (1), and the two short hexagon head bolt holes are respectively located on the base ( 1) On both sides of the vertical center line, and distributed symmetrically; A short pin (5) for determining the drilling position of the eccentric hole is set in the short pin hole, a long hexagon head bolt (6) is set in the long hexagon head bolt hole, and the long hexagon head bolt ( 6) The upper sleeve is provided with a positioning disc (8) for positioning the rear of the circuit breaker base (7), and the positioning disc (8) is fixed on the base (1) by two hexagonal screws (9). ), the front end of the long hexagon head bolt (6) is provided with threads along the circumferential surface; The center of the cover plate (2) is provided with a mounting hole (10) through which the front part of the long hexagon head bolt (6) can pass, and the peripheral surface of the front part of the cover plate (2) is provided with a Locate the collar at the front of the breaker base (7); A short hexagonal head bolt (11) is respectively arranged in the two short hexagonal head bolt holes, and each of the short hexagonal head bolts (11) is sequentially set with the balance weight (3), a small washer ( 12) and small hexagon nuts (14), the front ends of the short hexagon head bolts (11) are provided with threads along the circumferential surface, and the two small hexagon nuts (14) pass through the corresponding short hexagon head bolts ( 11) The threaded fit at the front fixes the two balance weights (3) on the base (1); When the circuit breaker base (7) is clamped on the lathe fixture, the circuit breaker base (7) is set on the base (1); the short pin (5) is inserted into the circuit breaker In a ratchet mounting hole of the base (7), the long hex head bolt (6) passes through the inner hole of the circuit breaker base (7), and the positioning disc (8) is inserted into the In the inner hole at the rear of the circuit breaker base (7); at the same time, the cover plate (2) is pressed on the circuit breaker base (7), and the convex ring of the cover plate (2) Fitted with the front of the circuit breaker base (7), the rear of the cover plate (2) is embedded in the front inner hole of the circuit breaker base (7); the long hex head bolt (6 ) passes through the mounting hole (10) of the cover plate (2), and is set with a large washer (15) and a large hex nut (16) in sequence, and the cover plate (2) passes through the The cooperation of the large hexagon nut (16) and the top thread of the long hexagon head bolt (6) presses the circuit breaker base (7) onto the base (1). 2. The lathe fixture for processing the eccentric hole of the circuit breaker base according to claim 1, characterized in that: the matching dimension of the short pin (5) and the short pin hole is Φ11H7/k6. 3. The lathe fixture for processing the eccentric hole of the circuit breaker base according to claim 1, characterized in that: the matching size of the positioning disc (8) and the inner ring at the rear of the circuit breaker base (7) It is Φ94.8H7/f6. 4. The lathe fixture for processing the eccentric hole of the circuit breaker base according to claim 1, characterized in that: the matching size of the rear part of the cover plate (2) and the inner ring of the front part of the circuit breaker base (7) is Φ100H9/d9. 5. The lathe fixture for processing the eccentric hole of the circuit breaker base according to claim 1, characterized in that: the diameter of the base (1) is 280mm. 6. The lathe fixture for processing the eccentric hole of the circuit breaker base according to claim 1, characterized in that: the diameter of the anti-interference center hole (4) is Φ17.5mm.