CN102493985A - Rotary limiting mechanism for turntable - Google Patents

Abstract

The invention relates to a rotary limiting mechanism for a turntable. The mechanism comprises a turning block, a fixing seat and a collision block, wherein the turning block consists of a first turning arm and a second turning arm which are vertical to each other; the turning block is movably connected with the fixing seat through a turning block shaft and can rotate about the turning block shaft in a range of 90 degrees; the collision block is fixed on an edge of a rotary part of the turntable; and when the collision block starts to rotate anticlockwise or clockwise at a 0-degree position of the turntable along the rotary part, the turning block can be pulled to rotate, and when the collision block rotates to a limiting position along the rotary part, the collision block collides the first turning arm or the second turning arm so as to realize rotary limiting of the turntable. The rotary limiting mechanism is a mechanical rotary limiting structure and has a simple structure and high reliability, and rotary limiting at approximate +/-360 degrees can be realized.

Description

Turntable rotation limit mechanism

technical field

The invention relates to a rotation limit protection mechanism of a turntable.

technical background

In some turntable equipment, due to work needs, the rotation angle of the turntable is close to ±360°. In order to prevent the cables and optical cables in the equipment from being twisted, it is necessary to set a limit protection mechanism. The current limit mechanism is an electromechanical type. The main disadvantage of the slewing mechanism is that the structure is slightly complicated. It needs to use the state sensor to judge the position of the stopper combined with the in-position sensor for logical judgment to realize the electric limit. The reliability needs to be improved. Another disadvantage is that the sensing range of the stopper to the in-position sensor is relatively small. , the turntable is easy to rush through the electric limit range due to inertia, and a mechanical collision limit is generated, which has an impact on the turntable.

Contents of the invention

The technical problem to be solved by the present invention is to provide a turntable rotation limiting mechanism with simple structure and high reliability.

In order to solve the above-mentioned technical problems, the turntable rotation limit mechanism of the present invention includes a turntable, a fixed seat, and a collision block; The fixed seat is movably connected, and can rotate within 90° around the axis of the turntable; the striker is fixed on the edge of the rotary part of the turntable, and can be toggled when the striker rotates counterclockwise or clockwise from the 0° position of the turntable with the turntable Turn the block to make it rotate; when the impact block rotates to the limit position with the rotary part, it hits the first or second arm of the turn block to realize the rotation limit of the turntable.

When the turntable starts to rotate counterclockwise from the 0° position, the bumper moves the first arm of the turntable to rotate clockwise 90°, and then the bumper continues to rotate with the turntable. When the turntable rotates counterclockwise to the limit position, the impact block collides with the outer surface of the second rotating arm to realize positive α angle limit. After the collision block collides with the outer surface of the second rotating arm, it rotates clockwise with the turntable. When the turntable turns to the 0° position, the bumper moves the second arm of the turnpiece to rotate it counterclockwise by 90°, and then the turntable continues to rotate. When the turntable rotates clockwise to the limit position, the bumper 7 collides with the outer surface of the first rotating arm to realize the negative α angle limit.

The invention is a mechanical rotation limit structure with simple structure and high reliability, and can realize a rotation limit close to ±360°.

The present invention may also include a contact switch; the contact switch is fixed on the fixed seat; when the first rotating arm is in the horizontal direction, the rotating block does not contact the contact switch, and the contact switch is disconnected; when the first rotating arm When it is in the vertical direction, the turning block is in contact with the contact switch, and the contact switch is turned on.

When the rotary part of the turntable starts to rotate counterclockwise from the 0° position, the bumper moves the first arm of the turntable to rotate clockwise, the turntable is separated from the contact switch, the contact switch is disconnected, and the turntable control system is notified to turn Some are in the range of 0°～+α. When the rotary part of the turntable rotates clockwise and returns to the 0° position, the bumper moves the second arm of the rotary block to rotate counterclockwise back to the initial position, the rotary block contacts the contact switch, and the contact switch is connected to notify The rotary part of the turntable control system is in the range of 0°～-α.

The outer sides of the first rotating arm and the second rotating arm of the rotating block are fixedly installed with an elastic buffer mechanism, which is used to prevent the collision block from directly colliding with the rotating block to generate an impact.

The elastic buffer mechanism installed on the first pivoting arm is composed of a spring pressure column, a buffer spring, and a pressure column nut; a through hole is processed on the first pivoting arm, and the pressure column nut is stuck at the shoulder inside the through hole and pressed against the spring. The part of the column extending into the through hole is threaded; the buffer spring is sleeved between the end of the spring pressing column and the outer surface of the first rotating arm.

The elastic buffer mechanism installed on the second rotating arm has the same structure as the elastic buffer mechanism on the first rotating arm.

When the bumper rotates counterclockwise and reaches the limit position, it collides with the spring pressure column of the elastic buffer mechanism of the second arm; The pressure column compresses the buffer spring to absorb energy to realize soft limit and avoid impact.

The present invention may also include a clockwise electric limit sensor and a counterclockwise electric limit sensor; the end faces of the first pivoting arm and the second pivoting arm of the rotary block are step surfaces; the clockwise electric limit sensor and the counterclockwise electric limit sensor It is fixed on both sides of the striker, and the radial position of the clockwise electric limit sensor corresponds to the step height of the first arm, and the radial position of the counterclockwise electric limit sensor corresponds to the step height of the second arm. corresponding to the position.

Adjust the high and low positions of the clockwise electric limit sensor and the counterclockwise electric limit sensor, so that the clockwise electric limit sensor does not generate a feedback signal when it passes through the lower surface of the step of the second arm, and generates a feedback signal when it passes through the high surface of the first step , feedback the in-position information, notify the control system to take braking measures to realize the electric limit; the counterclockwise electric limit sensor does not generate a feedback signal when it passes through the lower surface of the step of the first arm, and generates a feedback signal when it passes through the upper surface of the second arm. Feedback signal, feed back in-position information, notify the control system to take braking measures, and realize electric limit.

The reaction range between the high surface of the turning block step and the electric limit sensor is large, and the braking distance of the control system is large.

Description of drawings

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

Fig. 1 is a schematic diagram of the relative position of the turntable rotation limiting mechanism and the turntable according to the present invention.

Fig. 2 is a front view of the turntable rotation limiting mechanism of the present invention.

Fig. 3 is a right side view of Fig. 2 .

Fig. 4 is a left side view of Fig. 2 .

Fig. 5 is a perspective view of a rotary block.

Detailed ways

As shown in FIG. 1 , the rotary block 3 of the turntable rotation limiting mechanism of the present invention is movably connected with the fixed seat 5 ; the collision block 7 is fixed on the edge of the rotary part 30 of the turntable.

As shown in Figures 2, 3, 4, and 5, the rotary limit mechanism of the turntable of the present invention includes a contact switch 1, a rotary block 3, a fixed seat 5, a clockwise electric limit sensor 6, a collision block 7 and a counterclockwise electric limit sensor. bit sensor10. The fixed seat 5 is connected with the fixed part (base) of the turntable through the fixed seat screw 4, and the contact switch 1 is fixed on the fixed seat 5; the rotating block 3 is composed of a first rotating arm 31 and a second rotating arm 35 perpendicular to each other , the rotating block shaft 2 is movably connected with the fixed seat 5, and the rotating block shaft end cover 14 is fixedly connected with the fixed seat 5; The nut 13 is formed; the first rotating arm is processed with a through hole 34, and the pressure column nut 13 is stuck at the shoulder 41 inside the through hole 34 and is threadedly connected with the part of the spring pressure column 11 extending into the through hole 34; the buffer spring 12 suits Between the end of the spring pressure column 11 and the outer surface of the first arm 31; the structure of the elastic buffer mechanism installed on the second arm 35 is the same as the structure of the elastic buffer mechanism on the first arm 31. Column 21, buffer spring 22, pressure column nut (not shown in the figure) constitute; the end surface of the first pivot arm 31 and the second pivot arm 35 of turning block 3 is a stepped surface. The bumper 7 is fixedly connected to the edge of the rotary part 30 through the bumper screw 8, the clockwise electric limit sensor 6 and the counterclockwise electric limit sensor 10 are fixedly connected to the bumper 7 through the sensor frame 20 and the sensor frame 9 respectively, and The radial position of the clockwise electric limit sensor 6 corresponds to the step height 33 position of the first rotating arm 31 , and the radial position of the counterclockwise electric limit sensor 10 corresponds to the step height 36 position of the second rotating arm 35 . Adjust the high and low positions of the clockwise electric limit sensor 6 and the counterclockwise electric limit sensor 10, so that the clockwise electric limit sensor 6 does not generate a feedback signal when it passes through the step lower surface 37 of the second rotating arm 35, and passes through the first rotating arm When the step height of 31 is 33, a feedback signal is generated to feed back in-position information to notify the control system of the turntable to take braking measures to realize electric limit. When the counterclockwise electric limit sensor 10 passes through the step low face 32 of the first arm 31, no The feedback signal is generated when passing through the step high surface 36 of the second pivoting arm 35, and the feedback signal is fed back to the in-position information to notify the turntable control system to take braking measures to realize electric limit.

When the turntable was at the 0° position, the bumper 7 was in contact with the inner surface of the first arm 31 of the turntable 3, and now the turnpiece 3 was in contact with the contact switch 1, and the contact switch 1 was turned on. When the turntable starts to rotate counterclockwise from the 0° position, the bumper 7 moves the first arm 31 of the turntable 3 to make it rotate clockwise, the turntable 3 is separated from the contact switch 1, and the contact switch 1 is disconnected, indicating The rotary part 30 of the turntable control system is in the range of 0°～+α; when the rotary part 30 rotates counterclockwise to the limit position, the counterclockwise electric limit sensor 10 passes through the step high surface 36 of the second rotary arm 35 of the rotary block 3 Generate a feedback signal, feed back the in-position information, and notify the control system to take braking measures to realize the electric limit. If fail to brake in time for some reason, bumper 7 will bump into spring pressure post 21, and spring pressure post 21 compresses buffer spring 22 to absorb energy, realizes soft limit, avoids impact. Then, the striker 7 rotates clockwise with the swivel part 30 . When the rotary part 30 turns clockwise to the 0° position, the clockwise electric limit sensor 6 passes through the step lower surface 37 of the second arm 35 of the rotary block 3 without generating a feedback signal, and the bumper 7 moves the bottom of the rotary block 3 The second rotating arm 35 rotates it counterclockwise by 90°, the rotating block 3 is in contact with the contact switch 1, and the contact switch 1 is turned on to inform the control system that the rotating part 30 is in the range of -α～0°. When the rotary part 30 turns clockwise to the limit position, the clockwise electric limit sensor 6 passes through the step high surface 33 of the first arm 31 of the turn block 3 to generate a feedback signal, feedback the in-position information, and notify the control system to take braking measures , to achieve electrical limit. If fail to brake in time for some reason, bumper 7 will bump into spring pressure post 11, and spring pressure post 11 compresses buffer spring 12 to absorb energy, realizes soft limit, avoids impact.

Claims (6)

1. a turntable slewing limit mechanism is characterized in that comprising switch block (3), fixed base (5), collision block (7); Said switch block (3) is made up of orthogonal first pivoted arm (31) and second pivoted arm (35), and switch block (3) flexibly connects through switch block axle (2) and fixed base (5), and the piece axle (2) that can rotate rotates in 90 ° of scopes; Collision block (7) is fixed on the edge of turntable rotating part (30), when collision block (7) is begun counterclockwise by 0 ° of position of turntable with rotating part (30) or turns clockwise, can stir switch block (3) and make its rotation; When collision block (7) when rotating to spacing position, collides first pivoted arm (31) or second pivoted arm (35) of switch block (3) with rotating part (30), realize the turntable slewing limit.

2. turntable slewing limit mechanism according to claim 1 is characterized in that also comprising contact switch (1); Said contact switch (1) is fixed on the fixed base (5); When first pivoted arm (31) when being in substantially horizontal, switch block (3) does not contact with contact switch (1), and contact switch (1) breaks off; When first pivoted arm (31) when being in Vertical direction, switch block (3) contacts with contact switch (1), and contact switch (1) is connected.

3. turntable slewing limit mechanism according to claim 1 and 2 is characterized in that first pivoted arm (31) of said switch block (3) and the outside fixed installation elastic buffering mechanism of second pivoted arm (35).

4. turntable slewing limit mechanism according to claim 3, the elastic buffering mechanism that it is characterized in that being installed on first pivoted arm (31) is made up of spring compression leg (11), damping spring (12), compression leg nut (13); Be processed with through hole (34) on first pivoted arm (31), compression leg nut (13) is stuck in that the inner shoulder (41) of through hole (34) is located and is threaded with part that spring compression leg (11) stretches into through hole (34); Damping spring (12) is set between spring compression leg (11) end and first pivoted arm (31) outer side surface.

5. turntable slewing limit mechanism according to claim 4, the elastic buffering mechanism that it is characterized in that being installed on second pivoted arm (35) is identical with elastic buffering mechanism structure on first pivoted arm (31).

6. turntable slewing limit mechanism according to claim 1 is characterized in that also comprising clockwise electric limit sensors (6) and counterclockwise electric limit sensors (10); First pivoted arm (31) of switch block (3) and the end face of second pivoted arm (35) are step surface; Clockwise electric limit sensors (6) and counterclockwise electric limit sensors (10) are fixed in the both sides of collision block (7); And the radial position of clockwise electric limit sensors (6) is corresponding with the high face of step (33) position of first pivoted arm (31), and the radial position of counterclockwise electric limit sensors (10) is corresponding with the high face of step (36) position of second pivoted arm (35).

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