CN114135214A - Roller shutter door control device and control method of laser direct imaging equipment - Google Patents

Abstract

The invention discloses a roller shutter door control device and a method of laser direct imaging equipment, wherein the device comprises: the PLC, and a sensor, a first relay, a second relay, a motor and an encoder which are electrically connected with the PLC; the first relay and the second relay are respectively connected with the motor; one side of the rolling door close to the motor is provided with a row of a plurality of small holes which are vertically distributed; the encoder is used for sending various control commands to the PLC, the PLC controls the sensor, the first relay, the second relay, the encoder and the motor to work according to the various control commands, and the sensor is used for detecting the position change of the small holes so as to judge whether the rolling door collides with an obstacle in the movement process. The invention can detect whether the rolling door still continues to move after reaching the preset stop position so as to crash the rolling door or an obstacle.

Description

Roller shutter door control device and control method of laser direct imaging equipment

Technical Field

The invention relates to the technical field of laser direct imaging equipment, in particular to a roller shutter door control device and a roller shutter door control method of the laser direct imaging equipment.

Background

Referring to fig. 1, a roller shutter 11 is disposed in a laser direct imaging device 10, an upper end of the roller shutter 11 is wound on a rotating part 12, and when the roller shutter 11 is driven by the rotating part 12 to operate, a lower end of the roller shutter is inserted into a clamping groove 13, and the whole roller shutter 11 shields components inside the laser device to prevent eyes of an operator from being damaged by laser emitted by the laser. When the laser needs to be overhauled, the rotating part 12 is started to rotate or the rolling door 11 is pulled upwards manually, so that maintenance personnel can conveniently overhaul the laser. The laser detection device further comprises an upper limit switch for detecting the ascending of the roller shutter door 11 and a lower limit switch for detecting the descending of the roller shutter door 11. However, the upper limit switch can only exert the sensing function when the roller shutter door is at the uppermost position, the lower limit switch can only exert the sensing function when the roller shutter door is at the lowermost position, and the roller shutter door cannot be sensed when the roller shutter door is between the uppermost position and the lowermost position.

Referring to fig. 2, when it is desired to place the screen 15 into the laser direct imaging apparatus 10 or remove the screen 15 from the laser direct imaging apparatus 10, the shutter door 11 is raised or lowered to a certain height (e.g., the position of the horizontal line L3). At this time, if the operator performs an incorrect operation, for example, the lowermost end of the shutter door 11 does not wait until the lowermost end of the shutter door 11 stays stably at the preset stay position L3, the screen 15 is placed into the laser direct imaging apparatus 10 from the outside (black arrow faces inward) or the printed screen 15 is taken out of the laser direct imaging apparatus 10 (black arrow faces outward), the shutter door 11 which is not completely stopped and stable continues to move and touches the screen 15, so that the screen is damaged, or the operator is injured by work, or the shutter door 11 is damaged by multiple times.

Disclosure of Invention

The invention discloses a roller shutter door control device and method of laser direct imaging equipment, and aims to detect whether the lowermost end of a roller shutter door continues to move after reaching a preset stop position so as to cause the roller shutter door to collide with an obstacle.

The scheme of the invention is as follows:

a shutter door control apparatus of a laser direct imaging device, comprising: the PLC, and a sensor, a first relay, a second relay, an encoder and a motor which are all connected with the PLC; the first relay and the second relay are respectively connected with the motor;

one side of the rolling door close to the motor is provided with a row of a plurality of small holes which are vertically distributed;

the encoder is used for sending various control commands to PLC, and PLC is according to various control commands control sensor, first relay, second relay, encoder and motor work.

The sensor is used for detecting whether the positions of the small holes are changed or not so as to judge whether the rolling door collides with an obstacle or not in the moving process.

Further, the motor is arranged at one end of a rotating shaft, the rotating shaft is arranged at the upper part of the front of the laser direct imaging device, the upper end of the rolling door is wound on the rotating shaft, and the lower end of the rolling door is controlled to move up and down in the front of the laser direct imaging device.

Further: the maximum power-on time of the PLC for controlling the first relay to work is the first time required by the lower end part of the roller shutter door to ascend from a bottom clamping groove at the front end of the laser direct imaging equipment to the rotating shaft; the PLC controls the second relay to work, and the maximum power-on time is the second time required by the lower end part of the rolling door to descend from the rotating shaft to the clamping groove.

Further, the rolling door control device further comprises an upper limit switch for detecting the upward movement of the rolling door and a lower limit switch for detecting the downward movement of the rolling door, and the upper limit switch and the lower limit switch are electrically connected with the PLC.

Further, the sensor is a U-shaped photoelectric sensor.

Furthermore, the number of the small holes in the detection range of the U-shaped photoelectric sensor is a part of the small holes on the roller shutter door.

Furthermore, before the rolling door reaches the preset stop position, the encoder also sends a control command to enable the rolling door to move in a deceleration mode.

The invention also discloses a method for controlling the movement of the roller shutter door by using the roller shutter door control device of the laser direct imaging equipment, which comprises the following steps:

s1: arranging the roller shutter door at a preset stop position;

s2: calculating the time t required by the lowermost end of the roller shutter door to reach a preset stop position from an initial position;

s3, the encoder sends the first control signal to the PLC, the PLC controls the motor to rotate according to the first control signal, the motor drives the rotating shaft to rotate so as to drive the rolling door to rotate, and the lowest end of the rolling door moves to a preset stop position from an initial position;

s4: the encoder sends the second control signal to the PLC, the PLC sends the second control signal to the sensor, and the sensor detects whether the positions of the small holes in the roller shutter door change after the lowest end of the roller shutter door reaches the preset stop position so as to judge whether the lowest end of the roller shutter door collides with the obstacle.

Further: step S2 includes:

the required time t is tA, tA is: the time required by the lowest end of the roller shutter door to move from the initial position to the speed V in an accelerating mode from the speed of 0 is t1, the time required by the roller shutter door to move at a constant speed from the speed V is t2, the time required by the roller shutter door to move from the speed V to the speed of 0 is t3, and tA is t1+ t2+ t 3; or

The required time t is tB, which is: the time required for the lowermost end of the roller shutter to move from the initial position to the speed V in an accelerating mode from the speed 0 is t4, the time required for the roller shutter to move to the speed V in a decelerating mode from the speed V is t5, and tB is t4+ t 5.

Further, in step S4, the specific steps of detecting, by the sensor, whether the positions of the holes in the roll-up door change after the lowermost end of the roll-up door reaches the preset stop position to determine whether the lowermost end of the roll-up door collides with the obstacle include:

if the positions of the small holes are changed, the lowermost end of the rolling door impacts the barrier;

if the positions of the small holes are not changed, the lowermost end of the rolling door does not collide with the barrier.

The invention has the beneficial technical effects that: according to the method and the device, the encoder sends a control signal to the PLC, the PLC sends the control signal to the first relay, and the first relay controls the motor to rotate in the positive direction to drive the roller shutter door to ascend; the PLC sends the control signal to the second relay, and the second relay controls the motor to rotate reversely to drive the roller shutter door to descend. In order to prevent the roller shutter door from impacting an obstacle (the obstacle can be a screen, an arm of an operator or other objects) during movement, a row of small holes are vertically formed in one side of the roller shutter door close to the motor for detection of the sensor. Whether the rolling door wound on the rotating shaft continues to move is divided into two conditions: 1. the positions of the small holes on the roller shutter door detected by the sensor are not changed any more, which indicates that the lower end of the roller shutter door does not impact an obstacle; 2. if the positions of the holes in the roller shutter door detected by the sensor change, the roller shutter door wound on the outermost layer of the rotating shaft is warped, the positions of the holes in the roller shutter door on the outermost layer of the rotating shaft change accordingly, and the obstacle is hit by the lower end of the roller shutter door, so that the roller shutter door or the hit object is prevented from being damaged more greatly due to the fact that the lower end of the roller shutter door continuously hits the obstacle. 3. The speed of the rolling door from the initial position to the preset stopping position is set to be accelerated, uniform and decelerated until the speed is zero, or the rolling door is accelerated firstly and then decelerated until the speed is zero, and the speed of the rolling door is reduced to zero after the rolling door reaches the preset stopping position to the maximum extent, so that the lower end of the rolling door does not move continuously to impact an obstacle.

Drawings

Fig. 1 is a schematic view of a roller shutter 11 with a small hole and the lowest end of the roller shutter at the lowest position;

fig. 2 is a schematic view illustrating that the lowermost end of the shutter 11 is raised to a certain position when the screen 15 is replaced;

FIG. 3 is a detailed schematic view of the rotating member 12 of FIG. 2;

FIG. 4 is a schematic diagram of the module connection of the present invention;

fig. 5 is a schematic diagram showing the lowermost end of the shutter door 11 moving from the horizontal line position L1 at the uppermost end to the horizontal line position L3 at the lowermost end, the movement being accelerated and then decelerated.

Fig. 6 is a schematic diagram of the roller door 11-1 in which the roller door 121 just stops rotating when one of the rollers 11 is not engaged with the roller shaft 121, but the roller door in the outermost roller door still rotates downward because the roller door 11-1 is not engaged inside.

The names and serial numbers corresponding to the components in the figure are respectively: the device comprises a PLC1, a sensor 2, a first relay 3, a second relay 4, an encoder 5, an upper limit switch 6, a lower limit switch 7, a motor 8, a laser direct imaging device 10, a roller shutter door 11, a small hole 110, a rotating shaft 121, the lower end 112 of the roller shutter door, a clamping groove 13, an upper beam 14 of the laser direct imaging device, a screen 15 and a motor output shaft 81.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used merely to describe differences and are not intended to indicate or imply relative importance, and moreover, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 4, the present invention discloses a shutter door control apparatus of a laser direct imaging device, including: the PLC1, and the sensor 2, the first relay 3, the second relay 4, the encoder 5 and the motor 8 which are electrically connected with the PLC 1; the first relay 3 and the second relay 4 are connected to a motor 8, respectively. Referring to fig. 1 and 3, a row of vertically distributed small holes 110 is provided on the side of the shutter door 11 close to the motor 8. In fig. 4, the encoder 5 sends a command to the PLC1, and the PLC1 is configured to control the first relay 3 to be powered to drive the roll-up door 11 to move upward, and to control the second relay 4 to be powered to drive the roll-up door 11 to move downward.

The sensor 2 is used to detect the position change of the small hole 110 to determine whether the lower end of the roller shutter collides with an obstacle during the movement, and the obstacle may be, for example, the screen 15 in fig. 2 or a limb of an operator.

Referring to fig. 2 and 3, the motor 8 is connected to a rotating shaft 121 through a motor output shaft 81, and the roll screen 11 is wound around the rotating shaft 121, and the rotating shaft 121 is disposed at an upper end portion of the front of the laser direct imaging apparatus 10. The rotation shaft 121 drives the roller shutter 11 to move up or down by the rotation of the motor 8. In fig. 4, the PLC1 sends a command to the first relay 3, the first relay 3 controls the power-on time of the motor 8, and the motor 8 drives the roller shutter 11 to move upward during the power-on time. When the lowest end of the roller shutter 11 rises to the rotary shaft 121, the power-on time of the first relay 3 is over, and the motor stops operating. The first time required for the lower end 112 of the shutter door 11 to rise from the bottom card slot 13 of the laser direct imaging device to the rotating shaft 121 in fig. 3 is the maximum power-on time of the first relay. The second time required for the card slot 13 at the bottom of the shutter door 11 to descend from the rotating shaft 121 of the laser direct imaging device to the bottom card slot 13 is the maximum power-on time of the second relay 4.

In fig. 4, the roller shutter door control device further includes an upper limit switch 6 and a lower limit switch 7. The upper limit switch 6 is used for detecting the upward movement of the roller shutter door 11, the lower limit switch 7 is used for detecting the downward movement of the roller shutter door 11, and the upper limit switch 6 is placed in an upper cross beam 14 of the laser direct imaging device 10. The upper limit switch 6 and the lower limit switch 7 are both electrically connected with the PLC1 and controlled by the PLC 1.

As one example, the sensor 2 in fig. 4 is preferably a U-shaped photosensor. When the rolling door 11 is driven by the rotation of the rotating shaft 121, the small holes 110 on the rolling door 11 will rotate along with the rotation of the rolling door 11. The sensor 2 detects whether the small holes 110 are moving, so as to determine whether the rolling door 11 is moving. It should be noted that, in view of the detection range of the sensor 2, it is understood that the number of the small holes 110 that can be detected by the sensor 2 is a part of the total number of the small holes 110 of the rolling door 11.

Referring to fig. 2 and 5, if the roll door 11 needs to descend from the highest horizontal line L1 to the horizontal position L3, the encoder 5 in fig. 4 needs to send a command to the PLC, the PLC controls the second relay 4 to supply power to the motor 8, and the motor 8 needs to control the lowermost end 112 of the roll door 11 to move quickly or at a constant speed at the point a of the highest horizontal line L1 to the point B of the horizontal line L2, then move at a reduced speed from the point B to the point C of the horizontal line L3, and stop moving at the point C.

Referring to fig. 2, after the lowermost end 112 of the roll door 11 stops moving at the preset stop position, the roll door theoretically does not continue to move. However, if the rolling door shown in fig. 6 is bulged, the rolling door may continue to move, and the sensor 2 in fig. 3 may be used to detect whether the positions of the holes 110 on the outermost rolling door 11-1 are changed. The bulge is a case where the outermost layer is warped because the outermost layer and the sub-outer layer adjacent to the outermost layer are not bonded to each other when the lowermost end of the roll door hits an obstacle. If the position of the holes on the roller shutter door 11-1 in the outermost layer is detected to change by the sensor 2, it indicates that the lowermost end of the roller shutter door 11 in fig. 2 hits the screen 15 in fig. 2 or the arm or other obstacle of the operator. If the outermost roller shutter 11-1 in fig. 6 is attached to the first roller shutter 11-2 inside the outermost roller shutter, and both roller shutters are still after the rotation of the rotating shaft 121 stops, and the sensor 2 detects that the positions of the small holes 110 on the outermost roller shutter 11-1 are not changed, it can be known that the lowermost end 112 of the roller shutter 11 does not hit the screen 15 or the arm of the operator.

The invention also discloses a method for controlling the rolling door to move by the control device, which comprises the following steps:

s1: setting the lowest end of the roller shutter door to stay at a preset stay position;

s2: calculating the time t required by the lowermost end of the roller shutter door to reach a preset stop position from an initial position;

s3, the encoder sends a first control signal to the PLC, the PLC controls the motor to rotate according to the first control signal, and the motor drives the rotating shaft to rotate so as to drive the rolling door to rotate, so that the lowest end of the rolling door moves to the preset stopping position from the initial position;

s4: the encoder sends a second control signal to the PLC, the PLC sends the second control signal to the sensor, and the sensor detects whether the positions of the small holes in the roller shutter door change after the lowest end of the roller shutter door reaches the preset stop position so as to judge whether the lowest end of the roller shutter door collides with an obstacle.

In step S1, the preset stop position of the shutter door is any position between the highest position and the lowest position of the shutter door. For example, the highest position may be the height position of the rotating shaft 121 as shown in fig. 3, and the lowest position may be the bottom slot 13 as shown in fig. 2.

In step S2, the preset stop position is any one of the horizontal positions between the highest position and the lowest position. And calculating the time t required by the lowermost end of the rolling door to reach the preset stop position from the initial position. It can be understood that the rolling door sequentially undergoes accelerated motion, uniform motion and decelerated motion from the initial position to the preset stopping position until the speed is zero, or the rolling door is accelerated and then decelerated motion until the speed is zero, so that the speed of the rolling door is reduced to zero after the rolling door reaches the preset stopping position to the maximum extent, and the lower end of the rolling door does not move continuously to impact an obstacle.

Specifically, the aforementioned time t includes two cases: first, time t is equal to tA, tA being: the time t1 required by the lowest end of the roller shutter door to move from the initial position at an accelerating speed of 0 to a speed V, the time t2 required by the roller shutter door to move at a constant speed at the speed V and the time t3 required by the roller shutter door to move at a decelerating speed of 0 are t1+ t2+ t 3; in the second case, time t is equal to tB, tB being: the time t4 required by the lowest end of the roller shutter door to move from the speed of 0 to the speed V in an accelerating mode from the initial position, the time t5 required by the roller shutter door to move from the speed V to the speed of 0 in a decelerating mode is t4+ t 5.

Further, the preset stop position of the roller shutter is preferably the position where the screen horizontally enters and exits the roller shutter as shown in fig. 2.

Referring to fig. 4, in step S3, after the starting point and the predetermined stopping position of the roll door are set, the encoder sends a first control signal to the PLC, the PLC controls the first relay 3 to operate, the first relay 3 controls the motor to rotate in the forward direction, and the roll door is lifted from the starting point to the predetermined stopping position. If the preset stop position is lower than the starting point, namely the rolling door needs to descend, the PLC controls the second relay 4 to descend the rolling door from the starting point to the preset stop position. That is, the lowermost end of the roll screen door from the initial position to the preset stop position in step 3 may be achieved by raising the roll screen door, or by lowering the roll screen door.

In step S4, referring to fig. 2, after the lowermost end 112 of the roll door 11 stops moving at the preset stop position, the encoder sends a second control signal to the PLC, and the PLC sends the second control signal to the sensor, and the sensor determines whether the roll door actually stops moving by detecting whether the position of the small hole on the roll door changes. Generally, when the motor 8 of fig. 3 is stopped, the shutter door 11 stops moving. However, if the situation shown in fig. 6 occurs, the shutter door may continue to move, and the sensor 2 in fig. 3 may be used to detect whether the positions of the holes 110 on the shutter door 11-1 in the outermost layer in fig. 6 change. If the position of the holes on the roller shutter door 11-1 in the outermost layer is detected to change through the sensor 2, it indicates that the lowermost end of the roller shutter door 11 in fig. 2 hits the screen 15 or the arm of the operator or other obstacle. If the outermost roller shutter 11-1 in fig. 6 is attached to the first roller shutter 11-2 inside the outermost roller shutter, and both roller shutters are still after the rotation of the rotating shaft 121 stops, and the sensor 2 detects that the positions of the small holes 110 on the outermost roller shutter 11-1 are not changed, it can be known that the lowermost end 112 of the roller shutter 11 does not hit the screen 15 or the arm of the operator.

According to the method and the device, the encoder sends a control signal to the PLC, the PLC sends the control signal to the first relay, and the first relay controls the motor to rotate in the positive direction to drive the roller shutter door to ascend; the PLC sends the control signal to the second relay, and the second relay controls the motor to rotate reversely to drive the roller shutter door to descend. In order to prevent the rolling door from continuously moving and colliding with other obstacles after reaching the preset stop position, a row of vertically distributed small holes are vertically arranged on one side of the rolling door close to the motor, so that the sensor can detect whether the lower end of the rolling door still moves and judge whether the lower end of the rolling door collides with other obstacles.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (10)

1. A shutter door control apparatus of a laser direct imaging apparatus, comprising: the PLC is connected with a sensor, a first relay, a second relay, an encoder and a motor; the first relay and the second relay are respectively connected with the motor;

a row of small holes which are vertically distributed are formed in one side, close to the motor, of the rolling door;

the encoder is used for sending various control instructions to the PLC, and the PLC controls the sensor, the first relay, the second relay, the encoder and the motor to work according to the various control instructions;

the sensor is used for detecting whether the positions of the small holes are changed or not so as to judge whether the lowermost end of the rolling door continues to move to impact an obstacle or not after reaching the preset stop position.

2. The apparatus of claim 1, wherein the motor is disposed at an end of a rotating shaft disposed at an upper portion of a front of the apparatus, and the upper end of the shutter is wound around the rotating shaft and the lower end of the shutter is controlled to move up and down in front of the apparatus.

3. A shutter door control apparatus of a laser direct imaging apparatus as claimed in claim 2, wherein: the maximum power-on time of the PLC for controlling the first relay to work is the first time required for the lower end part of the roller shutter door to ascend from a bottom clamping groove at the front end of the laser direct imaging equipment to the rotating shaft; and the PLC controls the maximum power-on time of the second relay to work to be the second time required by the lower end part of the rolling door to descend from the rotating shaft to the clamping groove.

4. The roll door control apparatus of a laser direct imaging device of claim 1, further comprising an upper limit switch to detect an upward movement of the roll door and a lower limit switch to detect a downward movement of the roll door, the upper limit switch and the lower limit switch being electrically connected to the PLC.

5. The apparatus of claim 1, wherein the sensor is a U-shaped photo sensor.

6. The shutter door control apparatus of laser direct imaging device according to claim 5, wherein the number of the small holes in the detection range of the U-shaped photosensor is a part of the number of the small holes of the shutter door.

7. The apparatus of claim 1, wherein the encoder further sends control commands to slow the shutter door before the shutter door reaches a predetermined stop position.

8. A method of controlling the movement of a shutter door using the shutter door control apparatus of the laser direct imaging apparatus according to any one of claims 1 to 7, comprising the steps of:

s1: setting the lowest end of the roller shutter door to stay at a preset stay position;

s2: calculating the time t required by the lowermost end of the roller shutter door to reach the preset stop position from the initial position;

s3, the encoder sends a first control signal to the PLC, the PLC controls the motor to rotate according to the first control signal, and the motor drives the rotating shaft to rotate so as to drive the rolling door to rotate, so that the lowest end of the rolling door moves to the preset stopping position from the initial position;

s4: the encoder sends a second control signal to the PLC, the PLC sends the second control signal to the sensor, and the sensor detects whether the positions of the small holes in the roller shutter door change after the lowest end of the roller shutter door reaches the preset stop position so as to judge whether the lowest end of the roller shutter door collides with an obstacle.

9. The method of claim 8, wherein: step S2 includes:

the required time t is tA, tA is: the time required by the lowest end of the roller shutter door to move from the initial position to the speed V in an accelerating mode from the speed of 0 is t1, the time required by the roller shutter door to move at a constant speed from the speed V is t2, the time required by the roller shutter door to move from the speed V to the speed of 0 is t3, and tA is t1+ t2+ t 3; or

The required time t is tB, which is: the time required for the lowermost end of the roller shutter to move from the initial position to the speed V from the speed 0 in an accelerating mode is t4, the time required for the roller shutter to move to the speed V in a decelerating mode is t5, and tB is t4+ t 5.

10. The method of claim 8, wherein in step S4, the step of detecting whether the position of the plurality of holes on the shutter door changes after the lower end of the shutter door reaches the preset stop position by the sensor to determine whether the lowermost end of the shutter door collides with the obstacle comprises:

if the positions of the small holes are changed, the lowermost end of the rolling door impacts the barrier;

if the positions of the small holes are not changed, the lowermost end of the rolling door does not impact the obstacle.

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