CN105702493B - A kind of quick acting switching mechanism of band switch - Google Patents

Abstract

The invention discloses a fast action switching mechanism of a band switch, which comprises a casing, a cam arranged in the casing, the upper part of the cam is connected with a driven shaft, and the driven shaft is connected with an external circuit switching part, and the feature is that the fast action switching The mechanism also includes a driving shaft, an upper slider connected with the driving shaft, a lower slider cooperating with the upper slider, a first spring is arranged inside the lower slider, the lower slider is connected with the driven shaft, and the outer edges of the cams are evenly arranged There are several sections of V-shaped grooves, and the V-shaped grooves are connected by circular arcs. A positioning block matching the several sections of V-shaped grooves is arranged on the outside of the cam, and a second spring is arranged between the positioning block and the housing. , An annular spring fixed block is arranged between the cam and the housing to provide a movement guide for the second spring. The invention has the advantage of effectively avoiding the contradiction that the speed of the operation time affects the conversion time. The snap-action shift mechanism forces the circuit to automatically advance to the next gear with the help of stored-energy spring force, ensuring a controllable shift time.

Description

A Quick Action Switching Mechanism for Band Switch

technical field

The invention relates to a band switch, in particular to a fast action conversion mechanism of the band switch.

Background technique

The action conversion mechanism of the traditional band switch is mainly realized by the cooperation of the cam and the spring steel ball, and there is a common dead point in the operation (that is, the switch knob stays in the "middle position" and cannot be automatically reset or enter the next gear), resulting in infinite circuit conversion time. extend. Even if it is not in the extreme operation mentioned above, due to the difference of user's operation habits, the difference in the conversion time is relatively large. For equipment with circuit conversion time requirements, additional relays and power inputs need to be added, otherwise the failure rate of the equipment will be greatly increased.

Contents of the invention

The purpose of the present invention is to provide a fast action switching mechanism for a band switch, which solves the problem of uncontrollable switching time in the prior art.

In order to achieve the above object, the technical solution of the present invention is as follows: a quick action conversion mechanism of a band switch, including a housing, a cam arranged in the housing, the upper part of the cam is connected with the driven shaft, and the driven shaft is connected with the external circuit conversion part , it is characterized in that the fast action conversion mechanism also includes a driving shaft, an upper slider connected with the driving shaft, a lower slider cooperating with the upper slider, a first spring is arranged in the lower slider, the lower slider and the driven Shaft connection, several sections of V-shaped grooves are uniformly arranged on the outer edge of the cam, and the V-shaped grooves are connected by circular arcs, and positioning blocks matching the several sections of V-shaped grooves are arranged on the outside of the cam, and the positioning blocks and the shell A second spring is arranged between the bodies. The top of the positioning block is sharp, and the bottom is provided with a circular hole, one end of the second spring is located in the circular hole, and the other end of the second spring is in contact with the housing. Eight sections of V-shaped grooves are evenly arranged on the outer edge of the cam, and an annular spring fixing block is arranged between the cam and the housing. Four square holes are evenly arranged on the inner side of the annular spring fixing block, and a positioning block is arranged in each square hole. , There are four circular holes on the outer side of the annular spring fixing block, the second spring is located in the circular holes, and the circular holes provide motion guidance. The upper slider and the lower slider are respectively provided with matching arc-shaped bosses and arc-shaped grooves, a first spring is arranged in the arc-shaped grooves, and the arc-shaped protrusions extend into the arc-shaped grooves. There are arc-shaped bosses on both sides of the upper end of the lower slider, arc-shaped grooves are arranged on both sides of each boss, and an arc-shaped cross boss is arranged on both sides of the lower end of the upper slider. The end of the extended arc-shaped block is placed in the arc-shaped groove of the lower block, and can slide along the arc-shaped groove, and a first spring is arranged in the arc-shaped groove. A boss is provided in the middle of the lower end of the upper slider, and a round through hole in the shape of a flattened shape is arranged inside the boss, which is positioned in cooperation with the driving shaft. The upper section of the driven shaft is provided with a waist-shaped step, and the lower end of the lower slider is provided with a waist-shaped hole in a 90-degree direction with the arc-shaped boss on the upper end, which is matched with the waist-shaped step on the upper section of the driven shaft. The upper and lower ends of the housing are respectively provided with grooves, the upper slider and the lower slider are located in the grooves at the upper end of the housing, and the spring fixing blocks are located in the grooves at the lower end of the housing.

The driving shaft and the driven shaft isolate manual operation and circuit conversion.

The upper and lower sliders realize torque storage and release under the action of the first spring.

When the cam is gradually moving away from the V-shaped groove, the torque keeps increasing linearly, and the torque peak value is reached at the junction of the arc and the V-shaped groove.

When the cam enters the outer edge of the arc, it passes through the center of the circle with the force direction, so that the torque suddenly decreases from the peak value to the friction torque, and the torque generated by the opposite first spring is suddenly released, so that the cam passes through the circle quickly. The outer edge of the arc, enter the next transition position.

The advantages of the present invention are: by adding the first spring and the upper and lower sliders in front of the cam for energy storage, and using the driven shaft to distinguish between manual operation and circuit conversion, effectively avoiding the speed of the operation time from affecting the conversion Paradox of time. When the switch knob is about to rotate to the "dead point", the quick-action switching mechanism forces the circuit to automatically advance to the next gear with the help of the stored energy spring force, thus ensuring a controllable switching time.

Description of drawings

Fig. 1 is a schematic diagram of the appearance of the present invention.

Fig. 2 is an exploded schematic view of the present invention.

Fig. 3 is a half-sectional view of the present invention.

FIG. 4 is a cross-sectional view along line A-A of FIG. 3 .

Fig. 5 is a B-B sectional view of Fig. 3 .

Fig. 6 is a C-C sectional view of Fig. 3 .

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and examples.

The upper slider 2 is included in the figure, and a boss is provided in the middle of the lower end of the upper slider 2, and a circular through-hole in the shape of a flattened shape is provided inside the boss, which cooperates with the drive shaft 1 to be positioned and guides with a certain thickness; the upper slider Both sides of the lower end of the block 2 are respectively provided with an arc-shaped cross boss 11 . The outer sides of the upper end of the lower slider 4 are respectively provided with arc-shaped bosses 12, and each boss is provided with two arc-shaped grooves. The ends of the arc-shaped blocks extending outside the two ends of the arc-shaped cross boss 11 are placed in the arc-shaped groove of the lower block 4, and the two ends of the first spring 3 are respectively in contact with the left and right sides of the arc-shaped groove. The lower end of the lower slider 4 is provided with a waist-shaped hole 13 in a 90-degree direction with the arc-shaped boss 12 at the upper end, which is matched with the waist-shaped step on the upper section of the driven shaft 5 . The middle section of the driven shaft 5 is provided with a circularly flattened step to cooperate with the circularly flattened hole in the middle of the cam 6, and the lower section is provided with a circularly flattened step to connect with the external circuit conversion components. The outer edge of the cam 6 is circular, and its side is provided with a V-shaped groove, and the V-shaped groove is in contact with the positioning block 9 . The top of the positioning block 9 is pointed, the bottom is square, and a round hole is provided in the middle of the square. The inner end face of the round hole contacts the inner end face of the second spring 8, and the outer end face of the second spring 8 contacts the housing 7 surface. The positioning block 9 cooperates with the spring fixing block 10. A round hole is arranged in the middle of the spring fixing block 10 to avoid the cam. Four square holes are evenly arranged on its inner end surface to provide the movement guide of the positioning block 9. Four holes are arranged at the same position on the outer end surface. The round hole provides the movement guide of the second spring 8, and the two sides of the outer end surface of the spring fixing block 10 are also provided with circular positioning grooves, which are positioned and matched with the corresponding circular positioning bosses of the housing. The upper and lower end surfaces of the housing 7 are respectively provided with a groove, which isolates the upper and lower sliders from the spring fixing block; each side is provided with a through hole for external installation.

The driving shaft and the driven shaft isolate manual operation and circuit conversion.

The upper and lower sliders realize torque storage and release under the action of the first spring.

When the cam is gradually moving away from the V-shaped groove, the torque keeps increasing linearly, and the torque peak value is reached at the junction of the arc and the V-shaped groove.

When the cam enters the outer edge of the arc, it suddenly passes through the center of the circle along with the force direction, so that the torque suddenly decreases from the peak value to the friction torque, and the torque generated by the first spring 3 opposite to it is suddenly released, so that the cam passes quickly. The outer edge of the arc, enter the next transition position.

Claims (9)

1. A fast action conversion mechanism of a band switch, comprising a housing, a cam arranged in the housing, the upper part of the cam is connected with a driven shaft, and the driven shaft is connected with an external circuit conversion component, and it is characterized in that the quick action conversion mechanism also It includes the driving shaft, the upper slider connected with the driving shaft, the lower slider cooperating with the upper slider, the first spring is arranged in the lower slider, the lower slider is connected with the driven shaft, and several holes are evenly arranged on the outer edge of the cam. Segment V-shaped grooves, the V-shaped grooves are connected by circular arcs, positioning blocks matching the several segments of V-shaped grooves are arranged on the outside of the cam, a second spring is arranged between the positioning block and the housing, and the cam An annular spring fixing block is arranged between the housing and the housing to provide movement guidance for the second spring. 2. The quick action switching mechanism as claimed in claim 1, characterized in that the top of the positioning block is pointed, and the bottom end is provided with a circular hole, one end of the second spring is located in the circular hole, and the other end of the second spring is in contact with the circular hole. case contact. 3. The quick action conversion mechanism according to claim 1 or 2, characterized in that eight V-shaped grooves are evenly arranged on the outer edge of the cam, and an annular spring fixing block is arranged between the cam and the housing, and the annular spring is fixed Four square holes are evenly distributed on the inside of the block, and a positioning block is arranged in each square hole, and four round holes are arranged on the outside of the annular spring fixing block, and the second spring is located in the round hole, and the movement guide is provided by the round hole . 4. The quick-action conversion mechanism according to claim 1, wherein the upper slider and the lower slider are respectively provided with matching arc-shaped bosses and arc-shaped grooves, and a first spring is arranged in the arc-shaped grooves, The arc-shaped boss extends into the arc-shaped groove. 5. The quick action conversion mechanism as claimed in claim 4, characterized in that arc-shaped bosses are provided on both sides of the upper end of the lower slider, arc-shaped grooves are arranged on both sides of each boss, and the lower end of the upper slider There is an arc-shaped cross boss on each side of the exterior, and the ends of the arc-shaped blocks extending outside the two ends are placed in the arc-shaped groove of the lower block and can slide along the arc-shaped groove. A first spring is arranged in the groove. 6. The quick-action conversion mechanism according to claim 1, wherein a boss is provided at the middle of the lower end of the upper slider, and a circular through-hole in the shape of a flattened shape is provided inside the boss, which is positioned in cooperation with the drive shaft. 7. The fast action conversion mechanism as claimed in claim 1, characterized in that the upper part of the driven shaft is provided with a waist-shaped step, and the lower end of the lower slider is provided with a waist-shaped hole in the direction of 90 degrees to the arc-shaped boss at the upper end, which is connected with the driven shaft. Waist-shaped step fit on the upper section of the shaft. 8. The quick-action switching mechanism according to claim 1, wherein the middle section of the driven shaft is provided with a circular flattened step to cooperate with the circular flattened hole in the middle of the cam, and the lower section is provided with a circular flattened step. The flattened step is connected with the external circuit conversion part. 9. The quick action conversion mechanism as claimed in claim 1, characterized in that grooves are respectively provided at the upper and lower ends of the casing, the upper slider and the lower slider are located in the grooves at the upper end of the casing, and the spring fixing block Located in the groove at the lower end of the housing.