CN113733627A - Self-adaptive pressure maintaining mechanism - Google Patents
Self-adaptive pressure maintaining mechanism Download PDFInfo
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- CN113733627A CN113733627A CN202110931713.XA CN202110931713A CN113733627A CN 113733627 A CN113733627 A CN 113733627A CN 202110931713 A CN202110931713 A CN 202110931713A CN 113733627 A CN113733627 A CN 113733627A
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- 230000007246 mechanism Effects 0.000 title claims abstract description 51
- 238000012544 monitoring process Methods 0.000 claims abstract description 29
- 230000003044 adaptive effect Effects 0.000 claims description 35
- 238000003825 pressing Methods 0.000 claims description 18
- 230000004044 response Effects 0.000 claims description 11
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000004026 adhesive bonding Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 238000004804 winding Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/14—Control arrangements for mechanically-driven presses
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Abstract
The embodiment of the invention discloses a self-adaptive pressure maintaining mechanism, which utilizes the cooperation of a monitoring sensor, a driving device and a controller and detects the pressure maintaining force of a pressure plate through a plurality of monitoring sensors, so that the self-adaptive pressure maintaining mechanism can automatically adjust the pressure maintaining force of a plurality of positions of the pressure plate by utilizing the driving device. Therefore, the self-adaptive pressure maintaining mechanism can automatically adjust the pressure maintaining force according to the difference of each workpiece, and the cost of manual adjustment is saved. Meanwhile, the pressure maintaining force on the surface of the workpiece is balanced, and the product quality is improved.
Description
Technical Field
The invention relates to the field of machine manufacturing, in particular to a self-adaptive pressure maintaining mechanism.
Background
In the assembly process of electronic equipment such as mobile phones and tablet computers, in order to ensure that the glue adhesion between parts is firmer, pressure maintaining operation can be carried out on products after gluing. The traditional pressure head can not be well adapted to different products, and particularly, after the surface of the product is pressed and deformed, the pressure maintaining force applied to the part can be reduced, so that the pressure maintaining force of each part of the product is different.
Disclosure of Invention
In view of this, an embodiment of the present invention provides an adaptive pressure maintaining mechanism, which utilizes cooperation of a controller, a monitoring sensor and a driving device to enable the adaptive pressure maintaining mechanism to automatically adjust pressure maintaining force at each position of a pressure plate.
The self-adaptive pressure maintaining mechanism of the embodiment of the invention comprises:
a frame;
pressing a plate;
a driving device mounted on the frame, contacting with a plurality of positions of the pressure plate, and configured to apply a holding force to the plurality of positions of the pressure plate, respectively;
the monitoring sensors are used for respectively detecting pressure parameters of a plurality of positions of the pressing plate; and
and the controller is connected with the driving device and the monitoring sensor and is used for controlling the driving device to apply the pressure to different positions according to the pressure parameter.
Further, the driving device comprises a plurality of first drivers and a plurality of driving arms, the first drivers are fixedly arranged on the frame and provided with first output shafts, and the driving arms are connected with the first output shafts;
the arrangement positions of the monitoring sensors correspond to the connection positions of the pressure plate and the driving arm;
wherein the controller is configured to control the first driver to move down a corresponding position of a platen in response to the pressure parameter decreasing; and, in response to the pressure parameter increasing, controlling the first driver to move the corresponding position of the platen upward.
Furthermore, the driving arm and the pressing plate are connected in a screw joint mode;
wherein the controller is configured to control the corresponding drive arm to spin up in response to the pressure parameter decreasing; and controlling the corresponding drive arm to spin down in response to the pressure parameter decreasing or increasing.
Further, the adaptive pressure maintaining mechanism further comprises: a push plate having a plurality of through holes;
the driving device further comprises a second driver and an elastic element, the second driver is provided with a second output shaft, and the second output shaft is connected with the push plate;
the driving arm is provided with a positioning boss and is connected with the first driver through the through hole;
the elastic element is sleeved on the driving arm and acts on the push plate and the positioning boss by utilizing elasticity during pressure maintaining;
wherein the controller is connected to the second driver and configured to control the second driver to generate a holding pressure according to the pressure parameter, the connection of the first output shaft to the driving arm is configured to transmit the rotational torque of the first output shaft to the driving arm, and the driving arm and the first output shaft are connected to each other in such a manner that there is a predetermined degree of freedom in at least one radial direction and in an axial direction of the first output shaft.
Further, the first output shaft comprises a boss and a positioning pin, the boss is provided with a guide plane, and the positioning pin is arranged on the guide plane;
the driving arm is provided with a groove, and a guide groove is formed in the side wall of the groove;
the protruding part and the positioning pin are respectively contained in the groove and the guide groove, the guide plane is matched with the side wall of the groove, and the positioning pin is matched with the guide groove, so that the connection mode of the first output shaft and the driving arm is realized.
Further, the guide groove has a space from an end surface of the drive arm on a side close to the first output shaft, the guide groove penetrates the drive arm, and the positioning pin is detachably provided on the drive arm through the guide groove.
Further, the monitoring sensor comprises a distance sensor, and the pressure parameter is the pressing distance of the pressing plate detected by the distance sensor.
Furthermore, the self-adaptive pressure maintaining mechanism further comprises a bottom plate, and the bottom plate is arranged corresponding to the pressure plate and used for bearing the workpiece;
the monitoring sensor comprises a capacitance sensor, the capacitance sensor is provided with an upper electrode plate arranged on the pressing plate and a lower electrode plate arranged on the bottom plate, and the pressure parameter is the capacitance value of the capacitance sensor.
Furthermore, a polar plate accommodating groove is formed in the pressing plate and the position where the bottom plate is pressed with the workpiece, and the upper polar plate and the lower polar plate are arranged in the polar plate accommodating groove, so that the upper polar plate and the lower polar plate can avoid the workpiece during pressure maintaining.
Further, the elastic element is at least one of a spring or a rubber pad.
According to the self-adaptive pressure maintaining mechanism provided by the embodiment of the invention, the monitoring sensors and the driving device are matched with the controller, and the pressure maintaining force of the pressure plate is detected by the monitoring sensors, so that the self-adaptive pressure maintaining mechanism can automatically adjust the pressure maintaining force of the pressure plate at a plurality of positions by using the driving device. Therefore, the self-adaptive pressure maintaining mechanism can automatically adjust the pressure maintaining force according to the difference of each workpiece, so that the pressure maintaining force on the surface of the workpiece is balanced, and the product quality is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of an adaptive pressure maintaining mechanism according to an embodiment of the present invention;
FIG. 2 is an exploded view of an adaptive dwell mechanism of an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of an adaptive pressure maintaining mechanism according to an embodiment of the present invention;
FIG. 4 is a schematic pressure maintaining flow chart of the adaptive pressure maintaining mechanism according to the embodiment of the present invention;
FIG. 5 is a schematic illustration of the connection of the first output shaft to the drive arm of an embodiment of the present invention in some embodiments;
FIG. 6 is a schematic illustration of the connection of the first output shaft to the drive arm of an embodiment of the present invention in further embodiments;
FIG. 7 is an exploded schematic view of a capacitive sensor according to an embodiment of the invention;
fig. 8 is a schematic circuit diagram of a capacitive sensor of the adaptive pressure holding mechanism according to the embodiment of the present invention.
Description of reference numerals:
1-a drive device; 11-a second driver; 111-a second output shaft; 12-a first driver; 121-a first output shaft; 1211-a projection; 1212-a guide plane; 1213-locating pins; 1214-a body portion; 1215-a boss; 2-a controller; 3-a frame; 31-avoiding holes; 4-pushing the plate; 41-through holes; 5, pressing a plate; 6-an elastic element; 7-a drive arm; 71-positioning a boss; 72-a groove; 73-a guide groove; 74-a first channel; 75-a second channel; 8-a bottom plate; 9-monitoring a sensor; 91-an upper electrode plate; 92-a lower electrode plate; 93-a polar plate accommodating groove; 10-workpiece.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic structural diagram of an adaptive dwelling mechanism, fig. 2 is an explosion intention of the adaptive dwelling mechanism, fig. 3 is a schematic circuit diagram of a controller and detection sensors and a driving device, and as shown in fig. 1 to 3, the adaptive dwelling mechanism according to an embodiment of the present invention includes a frame 3, a platen 5, a driving device 1, a plurality of monitoring sensors 9, and a controller 2, wherein the driving device 1 is mounted on the frame 3 and is in contact with a plurality of positions of the platen 5, while the driving device 1 is configured to apply a dwelling force to the plurality of positions of the platen 5, respectively. The monitoring sensors 9 are used for respectively detecting pressure parameters of a plurality of positions of the pressure plate 5, and the controller 2 is connected with the driving device 1 and the monitoring sensors 9 and is used for controlling the driving device 1 to apply pressure to different positions according to the pressure parameters.
According to the adaptive pressure maintaining mechanism provided by the embodiment of the invention, the monitoring sensors 9 and the driving device 1 are matched with the controller 2, and the pressure maintaining of the pressure plate 5 is detected through the monitoring sensors 9, so that the adaptive pressure maintaining mechanism can automatically adjust the pressure maintaining of the pressure plate 5 at a plurality of positions by using the driving device 1, and the pressure plate 5 generates elastic deformation after being pressed by the driving arm 7, so that the pressure plate 5 at the position moves downwards. Therefore, the self-adaptive pressure maintaining mechanism can automatically adjust the pressure maintaining force according to the difference of the workpieces 10, so that the pressure maintaining force on the surfaces of the workpieces 10 is balanced, and the product quality is improved. It is easy to understand that the pressure maintaining of the gluing position of the workpiece 10 after gluing can ensure the tightness of gluing and the stability of part bonding. Some workpieces 10 are elastically deformed by slight pressure on their surface, and the workpieces 10 return to their pre-stressed shape when the pressure is removed. When the pressure maintaining machine in the prior art is used for maintaining the pressure of the workpiece 10, the deformation of the workpiece 10 causes insufficient pressure at the position, and finally the sealing of the gluing position is not tight. The adaptive pressure maintaining mechanism in this embodiment can compensate more pressure maintaining force for the position where the pressure is reduced, so that the pressure maintaining force of the pressure maintaining mechanism on the workpiece 10 meets the requirement.
Preferably, a person skilled in the art can adjust the preset holding pressure of the driving device on the workpiece 10 by using a controller according to the holding pressure requirement of the workpiece 10, so as to adapt to the requirement of different types of workpieces 10 on the holding pressure.
It is easy to understand that the connection mode of the driving device and the monitoring sensor in this embodiment may be an electrical connection and a communication connection using a mobile network. The selection can be made by those skilled in the art according to the actual working condition requirements.
As shown in fig. 2, further, the driving device includes a plurality of first drivers 2 and a plurality of driving arms 7, the first drivers 2 are fixedly disposed on the frame 3, the first drivers 2 have first output shafts 21, and the driving arms 7 are connected to the first output shafts 21. The plurality of monitoring sensors are disposed at positions corresponding to positions where the pressure plate 5 and the driving arm 7 are connected, wherein the controller is configured to control the first driver 2 to move the corresponding position of the pressure plate 5 downward in response to a decrease in the pressure parameter, and to control the first driver 2 to move the corresponding position of the pressure plate 5 upward in response to an increase in the pressure parameter. In this embodiment, when the pressure on the workpiece 10 is reduced or increased, the adaptive pressure maintaining mechanism can compensate the pressure maintaining force of the pressure plate 5 correspondingly, so as to omit the manual detection step and enable the adaptive pressure maintaining mechanism to be adjusted autonomously in real time. It is easily understood that the first driver 2 in this embodiment may be one of a linear motor, an air cylinder, or a plunger pump, and a person skilled in the art may select a power source capable of providing linear power as the first driver 12 according to actual needs.
The plurality of driving arms 7 in the above embodiment are all connected to one pressing plate 5. Preferably, the number of the pressing plates 5 is also plural and the same as the number of the driving arms 7, and each pressing plate 5 is provided independently of each other. In the present embodiment, each driving arm 7 is connected to one pressure plate 5. At this time, the adaptive pressure maintaining mechanism can apply pressure maintaining force to different positions of the workpiece 10, and the pressure maintaining force of the pressure plates 5 does not affect each other.
Further, the driving arms 7 are connected to the pressure plate 5 in a screw joint manner, wherein the controller 2 is configured to control the corresponding driving arm 7 to rotate upwards in response to a decrease in the pressure parameter, and to control the corresponding driving arm 7 to rotate downwards when the pressure parameter decreases. In this embodiment, the driving arm 7 is connected to the pressure plate 5 by a screw, and the vertical movement of the pressure plate 5 is controlled by the rotation of the driving arm 7 when the holding pressure is adjusted.
It is easy to understand that the first driver 12 can be one of a servo motor or a stepping motor, and a person skilled in the art can select a power source capable of providing a rotation torque as the first driver 12 according to actual requirements. Take a 1.8 degree two-phase stepping motor as an example: when the two-phase windings are energized, the output shaft of the motor is at a standstill and is locked in position, and the maximum torque for keeping the motor locked under rated current is the holding torque. If the current in one of the phase windings changes direction, the motor will rotate one step (1.8 degrees) in a given direction. Similarly, if the current in the other winding changes direction, the motor will rotate one step (1.8 degrees) in the opposite direction. When the current passing through the coil winding is sequentially changed in direction and excited, the motor can continuously rotate and step along the set direction. From this, self-adaptation pressurize mechanism in this embodiment utilizes step motor's rotatory step-by-step drive actuating arm 7 to follow the screw thread rotation, and then can be more accurate control clamp plate 5 reciprocate.
As shown in fig. 2, in some embodiments, the adaptive pressure maintaining mechanism further includes a push plate 4, and the driving device further includes a second driver 11 and an elastic element 6. The push plate 4 has a plurality of through holes 41, the driving device 1 further includes a second driver 11 and an elastic element 6, the second driver 11 has a second output shaft 111, the second output shaft 111 is connected with the push plate 4, the driving arm 7 has a positioning boss 71, and the driving arm 7 is connected with the first driver 12 through the through holes 41. The elastic element 6 is sleeved on the driving arm 7, and acts on the push plate 4 and the positioning boss 71 by using elastic force during pressure maintaining. Meanwhile, the controller 2 is connected to the second driver 11, configured to control the second driver 11 to generate a holding pressure according to a pressure parameter, the connection of the first output shaft 121 and the driving arms 7 is configured to be one-to-one connection, transmitting a rotational torque of the first output shaft 121 to the driving arms 7, and the driving arms 7 and the first output shaft 121 are connected to each other in such a manner that there is a predetermined degree of freedom in at least one of an axial direction and a radial direction of the first output shaft 121.
The holding pressure applied to the workpiece 10 by the adaptive holding pressure mechanism in this embodiment can be divided into two stages. Fig. 4 shows 3 states of the adaptive pressure holding mechanism in operation, where the adaptive pressure holding mechanism at i is in a state where the second driver 11 drives the platen 5 to move toward the workpiece 10, the adaptive pressure holding mechanism at ii is in a state where the second driver 11 drives the platen 5 to press the workpiece 10, and the adaptive pressure holding mechanism at iii is in a state where the first driver 21 adjusts the pressure holding force.
First, the second output shaft 111 of the second driver 11 of the present embodiment is connected to the push plate 4 in the first stage, and the second driver 11 can transmit power to the push plate 4. Meanwhile, the elastic element 6 and the positioning boss 71 arranged on the driving arm 7 are utilized, so that the push plate 4 can indirectly transmit the pushing force to the pressure plate 5, and the first-stage pressure maintaining is carried out on the workpiece 10 (as shown at I and II in FIG. 4). Then, in the second stage, the pressure holding force of the pressure plate 5 on the workpiece 10 is detected by the monitoring sensor 9, and when the pressure holding force changes, the controller controls the first driver 12 to compensate the pressure holding force of the corresponding position of the pressure plate 5. Specifically, when the pressure detected by the monitoring sensor 9 in a certain area decreases, the first driver 12 controls the driving arm 7 to rotate upwards along the screw thread, i.e. the screw thread shown in area a at iii in fig. 4, and the elastic element 6 with one end abutting against the positioning boss 71 is pressed, and the elastic force directly acts on the push plate 4, but the push plate 4 is applied with a downward pushing force by the second driver 11. Therefore, the push plate 4 reversely transmits the downward pressure to the press plate 5, the downward pressure is gradually increased by the continuous upward rotation of the driving arm 7, and the first driver 2 stops rotating upward when the holding pressure detected by the monitoring sensor 9 reaches a predetermined value (i.e., the increased holding pressure compensates for the decreased holding pressure). Similarly, when the detection sensor 9 detects an increase in the holding pressure, the movement pattern of the drive arm 7 is configured to be opposite to that when the holding pressure decreases, and therefore, the description thereof will be omitted.
It should be understood that the first output shaft 121 and the driving arm 7 are configured to be connected in this embodiment, so as to realize the mechanism motion of the two pressure maintaining stages in this embodiment. When the push plate 4 is pressed down in the first stage, the elastic force of the elastic member 6 acts on the positioning boss 71, so that the driving arm 7 is also moved down together. However, the first driver 12 is fixed to the frame 3, and the position of the first output shaft 121 is fixed when the first driver 12 is not activated, so that the driving arm 7 and the first output shaft 121 need to be connected in a manner that they are movable relative to each other in the axial direction, that is, the driving arm 7 and the first output shaft 121 are connected to each other in a manner that there is a predetermined degree of freedom in the axial direction of the first output shaft 121. When the first actuator 12 adjusts the holding pressure in the second phase, the second actuator 11 needs to transmit a rotational moment to the drive arm 7. Therefore, the connection of the first output shaft 121 and the drive arm 7, which is the connection method, is configured to transmit the rotational torque of the first output shaft 121 to the drive arm 7. In addition to the freedom to move up and down during the adjustment of the holding pressure, the pressure plate 5 also has a slight lateral movement substantially perpendicular to the direction of the up and down movement, i.e. the drive arm 7 is interconnected with the first output shaft 121 in such a way that there is a predetermined freedom in at least one radial direction of the first output shaft 121.
It is easily understood that at least one radial direction of the present embodiment can satisfy the displacement of the pressure plate 5 generated at the time of the holding pressure adjustment in the radial direction. Meanwhile, in order to meet the requirement that the holding pressure in multiple directions can be adjusted, the skilled person can select a corresponding universal joint which can meet the function to realize the adjustment.
Alternatively, when the monitoring sensor detects that the holding pressure applied by the pressure plate 5 to the workpiece 10 is suddenly increased, for example, foreign matter falls on the surface of the workpiece 10 during the holding pressure process, or fingers of a field operator are not removed in time when the workpiece 10 is placed, the pressure plate 5 starts to press down on the workpiece 10. At the moment, the controller can also directly control the second driver 11 to drive the push plate 5 to move upwards quickly, so that the operation safety of the machine is ensured, and the automation level of the self-adaptive pressure maintaining mechanism is improved.
It is easy to understand that the elastic force of the elastic element 6 of the present embodiment should be configured to be not less than the holding pressure of the pressing plate 5 on the workpiece 10, so as to avoid the elastic element 6 being fully compressed, and the first driver 12 cannot further adjust the holding pressure.
Preferably, the frame 3 may further include a relief hole 31, and the relief hole 31 may allow the first output shaft 121 and the second output shaft 111 of the first driver 12 and the second driver 11 to pass through, so as to facilitate connection of the driving device 1 with a lower device. Wherein, the avoiding hole 31 corresponding to the driving arm 7 can be arranged coaxially with the through hole 41, which facilitates the connection of the first driver 12 and the driving arm 7.
Fig. 5 is a schematic diagram of the connection between the first output shaft 121 and the driving arm 7, and as shown in fig. 5, in some embodiments, the first output shaft 121 includes a projection 1211 and a positioning pin 1213, the projection 1211 has a guide plane 1212, and the positioning pin 1213 is disposed on the guide plane 1212. The driving arm 7 has a groove 72, a guide slot 73 is formed on a side wall of the groove 72, the projection 1211 and the positioning pin 1213 are respectively accommodated in the groove 72 and the guide slot 73, and the guide plane 1212 and the side wall of the groove 72 are matched and the positioning pin 1213 and the guide slot 73 are matched to realize a connection mode of the first output shaft 121 and the driving arm 7. The connection mode in this embodiment can transmit the torque of the first output shaft 21 to the driving arm 7, and also retains the axial and radial degrees of freedom of the driving arm 7 relative to the first output shaft 21.
Further, the guide groove 73 has a space from an end surface of the drive arm 7 on the side close to the first output shaft 121, and the guide groove 73 penetrates the drive arm 7, and the positioning pin 1213 is detachably provided on the drive arm 1213 through the guide groove 73. In order to prevent the driving arm 7 from completely separating from the first output shaft 121 during the up-and-down movement, the guide groove 73 in this embodiment has a space from the end surface so that the driving arm 7 does not separate from the first output shaft 121 even if the distance for moving down is too large.
Fig. 6 is a schematic view of another connection manner of the first output shaft 121 and the driving arm 7, as shown in fig. 6, in some embodiments, the first output shaft 121 includes a main body portion 1214 and a protrusion 1215 connected to the main body portion 1214, the driving arm 7 has a first channel 74 and a second channel 75, the first channel 74 is sleeved on the main body portion 1214, the second channel 75 is sleeved on the protrusion 1215, and there is a gap between the first channel 74 and the main body portion 1214 and between the second channel 75 and the protrusion 1215. In this embodiment, the rotation torque of the first output shaft 121 can be transmitted to the driving arm 7 through the boss 1215 and the second channel 75, and the axial and the multiple radial degrees of freedom of the driving arm 7 with respect to the first output shaft 121 can be realized through the gap between the first output shaft 121 and the driving arm 7.
Further, the monitoring sensor 9 includes a distance sensor, and the pressure parameter is a pressing distance of the platen 5 detected by the distance sensor. In the embodiment, the pressure parameter is indirectly obtained by using the distance parameter, and the distance sensor can be not in direct contact with the pressure plate 5 or the workpiece 10 during measurement, so that the use is more convenient. The distance sensor in the present embodiment includes, but is not limited to, a laser ranging sensor, an infrared sensor, and the like.
Fig. 7 is an exploded schematic view of a capacitive sensor, and fig. 8 is a circuit schematic view of the capacitive sensor, as shown in fig. 7-8, in some embodiments, the adaptive pressure maintaining mechanism further includes a bottom plate 8, and the bottom plate 8 is disposed corresponding to the pressure plate 5 and used for carrying the workpiece 10. The monitoring sensor 9 includes a capacitance sensor having an upper electrode plate 91 disposed on the pressing plate 5 and a lower electrode plate 92 disposed on the bottom plate 8, and the pressure parameter is a capacitance value of the capacitance sensor. The size of the capacitor is inversely proportional to the distance between the electrode plates, i.e. the larger the distance between two electrode plates, the smaller the capacitance value, and vice versa. In this embodiment, the pressure maintaining force applied to the workpiece by the pressure plate 5 is indirectly obtained by using the variation relationship between the distance between the electrode plates and the capacitance value, so that the pressure maintaining force is more accurately detected. Fig. 8 shows that the controller 2 obtains the pressure of the pressing plate 5 on the workpiece 10 according to the collected capacitance value, and the controller 2 and the motor control chip control the operation of the motor to adjust the pressure of the corresponding area of the pressing plate 5.
Further, the pressing plate 5 and the bottom plate 8 are provided with an electrode plate accommodating groove 93 at the position where they are pressed with the workpiece 10, and the upper electrode plate 91 and the lower electrode plate 92 are disposed in the electrode plate accommodating groove 93, so that the upper electrode plate 91 and the lower electrode plate 92 are avoided from the workpiece during pressure maintaining. In this embodiment, the depth of the electrode plate receiving groove 93 is slightly greater than the thickness of the electrode plate, so that the electrode plate is completely sunk into the electrode plate receiving groove 93, and the workpiece 10 is prevented from being extruded to the electrode plate in the pressure maintaining process.
In some embodiments, the resilient element 4 is at least one of a spring or a rubber pad. The spring has a larger compression ratio than that of the rubber pad, and therefore, when the deformation of the workpiece 10 after being pressed is large, the spring may be preferably used as the elastic member 4.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An adaptive pressure maintaining mechanism, characterized in that, the adaptive pressure maintaining mechanism includes:
a frame (3);
a pressure plate (5);
a drive device (1) mounted to the frame (3), in contact with a plurality of positions of the platen (5), and configured to apply a holding pressure to each of the plurality of positions of the platen (5);
a plurality of monitoring sensors (9) for detecting pressure parameters at a plurality of positions of the platen (5), respectively; and
and the controller (2) is connected with the driving device (1) and the monitoring sensor (9) and is used for controlling the driving device (1) to apply the pressure maintaining force to different positions according to the pressure parameter.
2. The adaptive pressure maintaining mechanism according to claim 1, characterized in that the driving device (1) comprises a plurality of first drivers (12) and a plurality of driving arms (7), the first drivers (12) are fixedly arranged on the frame (3), and the first drivers (12) have first output shafts (121), the driving arms (7) are connected with the corresponding first output shafts (121) in a one-to-one manner;
the arrangement positions of the monitoring sensors (9) correspond to the connection positions of the pressure plate (5) and the driving arm (7);
wherein the controller (2) is configured to control the first driver (12) to move the corresponding position of the platen (5) down in response to the pressure parameter decreasing; and, in response to the pressure parameter increasing, controlling the first driver (12) to move the corresponding position of the platen (5) upwards.
3. The adaptive pressure maintaining mechanism according to claim 2, characterized in that the driving arm (7) is connected with the pressure plate (5) in a screw connection manner;
wherein the controller (2) is configured to control the corresponding drive arm (7) to spin up in response to the pressure parameter decreasing; and controlling the corresponding driving arm (7) to spin down in response to the pressure parameter increasing.
4. The adaptive dwell mechanism of claim 3, further comprising: a push plate (4), the push plate (4) having a plurality of through holes (41);
the driving device (1) further comprises a second driver (11) and an elastic element (6), wherein the second driver (11) is provided with a second output shaft (111), and the second output shaft (111) is connected with the push plate (4);
the driving arm (7) is provided with a positioning boss (71), and the driving arm (7) is connected with the first driver (12) through the through hole (41);
the elastic element (6) is sleeved on the driving arm (7) and acts on the push plate (4) and the positioning boss (71) by utilizing the elastic force during pressure maintaining;
wherein the controller (2) is connected to the second driver (11) and configured to control the second driver (11) to generate a holding pressure in accordance with the pressure parameter, the connection of the first output shaft (121) to the drive arm (7) is configured to transmit the rotational torque of the first output shaft (121) to the drive arm (7), and the drive arm (7) and the first output shaft (121) are interconnected with a predetermined degree of freedom in at least one radial direction and in an axial direction of the first output shaft (121).
5. The adaptive pressure maintaining mechanism according to claim 4, characterized in that the first output shaft (121) includes a boss (1211) and a positioning pin (1213), the boss (1211) having a guide plane (1212), the positioning pin (1213) being disposed on the guide plane (1212);
the driving arm (7) is provided with a groove (72), and a guide groove (73) is arranged on the side wall of the groove (72);
the protruding part (1211) and the positioning pin (1213) are accommodated in the groove (72) and the guide groove (73), respectively, the guide plane (1212) is matched with the side wall of the groove (72) and the positioning pin (1213) is matched with the guide groove (73), so that the connection mode of the first output shaft (121) and the driving arm (7) is realized.
6. The adaptive pressure maintaining mechanism according to claim 5, characterized in that the guide groove (73) has a space from an end surface of the drive arm (7) on a side close to the first output shaft (121), and the guide groove (73) penetrates the drive arm (7), and the positioning pin (1213) is detachably provided on the guide plane (1212) through the guide groove (73).
7. The adaptive dwell mechanism according to claim 1, characterized in that the monitoring sensor (9) comprises a distance sensor, the pressure parameter being the distance of depression of the pressure plate (5) detected by the distance sensor.
8. The adaptive pressure maintaining mechanism according to claim 1, further comprising a bottom plate (8), wherein the bottom plate (8) is arranged corresponding to the pressure plate (5) and is used for bearing the workpiece (10);
the monitoring sensor (9) comprises a capacitance sensor, the capacitance sensor is provided with an upper electrode plate (91) arranged on the pressing plate (5) and a lower electrode plate (92) arranged on the bottom plate (8), and the pressure parameter is the capacitance value of the capacitance sensor.
9. The adaptive pressure maintaining mechanism according to claim 8, wherein a position where the pressure plate (5) and the bottom plate (8) are pressed against the workpiece (10) has a plate accommodating groove (93), and the upper electrode plate (91) and the lower electrode plate (92) are disposed in the plate accommodating groove (93) so that the upper electrode plate (91) and the lower electrode plate (92) are retracted from the workpiece (10) during pressure maintaining.
10. The adaptive pressure maintaining mechanism according to claim 4, characterized in that the elastic element (6) is at least one of a spring or a rubber pad.
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