Pressing plate device capable of being pressed for inspection

Abstract

The invention belongs to the technical field of aviation intelligent manufacturing, and discloses a pressing plate device capable of pressing inspection, the pressing plate device is a mechatronics device, a mechanical part comprises a pressing plate block body, a sensor force bearing assembly, a control box, a protective cover, a threaded connection fastener and other accessories; the electrical hardware part comprises a power supply, an LED indicating lamp display group, a force measuring sensor, a control panel, corresponding electrical components, a self-locking button group, an adjusting knob group, a reset button, a switch piece, other electrical control and electrical connection accessories and the like. The pressing state of the workpiece in the machining process can be inspected through lamp display changes, so that early warning and judgment are formed for abnormal fixing of the workpiece, and production safety is effectively guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of workpiece fixtures and safety detection and early warning of numerically controlled cutting processing equipment in aviation manufacturing, and specifically relates to a pressing plate device that can be used to clamp and inspect a workpiece for fixing it on a vertical workbench. Background Art

[0002] With the widespread use of CNC machining technology in the field of mechanical manufacturing, many high-efficiency CNC cutting and processing equipment, such as large CNC panel milling machines, use vertical workbenches. When installing and fixing large sheet workpieces, their large planes are adsorbed on the vacuum platform in the vertical direction, and then the ordinary pressure plate assembly is used to fit and press along the normal direction of the workbench. At this time, the vacuum adsorption force and the pressure plate pressing force are horizontally and vertically directed to the workbench, and the gravity direction of the workpiece is always vertically downward. Due to the risk of failure of vacuum adsorption itself, the threaded fasteners and their connection pairs of the ordinary pressure plate assembly will also face the risk of failure due to long-term use, especially when the weight or thickness of the workpiece increases, which makes the risk of vacuum adsorption and pressure plate pressing failure increase rapidly; in the actual production and processing process, with heavy-load cutting, instantaneous increase or uneven change of chip force, and processing vibration and other factors, the workpiece may have abnormal fixation such as poor overall clamping, movement or slight position change, and the degree of fixation cannot be known under normal circumstances. There is no feedback on the clamping state of the ordinary pressure plate assembly during the workpiece processing.

[0003] Therefore, there is an urgent need to design a clamping and inspection pressure plate device for fixing workpieces on a vertical workbench, which can directly inspect the clamping state of the workpiece, and form an early warning and judgment on the possible or imminent abnormal fixation or even complete clamping failure of the workpiece as a whole, so as to timely repair or re-tighten it reliably, avoiding the huge losses caused by out-of-tolerance or even scrapping of the workpiece due to abnormal fixation during the processing, and also avoiding the risk of workpiece movement or even falling caused by sudden or complete clamping failure. Summary of the invention

[0004] The present invention aims to solve the problems of feedback and visual requirements of the clamping status of the clamping plate used to fix the workpiece on the existing vertical workbench, and proposes a clamping and inspectionable clamping plate device, which avoids the risk of workpiece movement or even falling caused by sudden or complete failure of clamping, and effectively ensures production safety.

[0005] In order to achieve the above invention objectives, the technical solutions adopted in this application are as follows:

[0006] A pressing plate device capable of pressing and inspecting, the pressing plate device being a mechatronic device, comprising:

[0007] The mechanical part includes a pressure plate body, a control box and a force sensor. The control box is buckled with a protective cover on the outer surface and is installed on the pressure plate body. The force sensor is installed on the pressure plate body. A sensor bearing assembly is encapsulated at the bottom of the force sensor.

[0008] The electrical hardware part includes power supply, LED indicator display group, force sensor, control panel and corresponding electrical components, self-locking button group, adjustment knob group, reset button, switch and other electrical control and electrical connection accessories;

[0009] The electrical control circuit includes a pressure detection and feedback circuit, a pressure signal processing circuit, and a light display control circuit.

[0010] As a further solution of the present invention: the position, shape, size and thread characteristics of each slot cavity of the pressure plate body are adaptively designed according to the installation methods of different components.

[0011] As a further solution of the present invention: the control box is composed of a control box fastening screw, an upper cover assembly, a lower box body, and a sealing strip. The upper cover assembly and the lower box body are connected by the control box fastening screws, and are threadedly connected to the pressure plate body at the sunken groove position on the upper surface to complete the fastening installation.

[0012] As a further solution of the present invention: the protective cover is simply snapped on to the convex edge of the upper cover assembly through the corresponding groove inside the protective cover.

[0013] As a further solution of the present invention: the force sensor is upwardly mounted in the front end cavity of the pressure plate body through the sensor fastening screw, and the sensor force-bearing component is upwardly mounted at the corresponding position here and is fastened and locked in the initial position through the sensor force-bearing component fastening screw.

[0014] As a further solution of the present invention: the sensor load-bearing assembly is composed of a column spring, a column, and a base plate, and the lower surface of the base plate is in contact and pressed against the surface of the workpiece.

[0015] As a further solution of the present invention: the sensor load-bearing component, through its structural design, ensures self-reset in the normal position by the application and installation of the compression spring of the column head spring, ensures the up and down displacement distance δ1 by the coordinated installation of the long through hole of the column and the fixing screw of the sensor load-bearing component, ensures the non-contact gap δ2 between the secondary upper surface of the bottom plate and the lower surface of the pressure plate body in the non-stress state by the thickness dimension and installation position of the bottom plate, ensures the non-contact gap δ3 between the top surface of the bottom plate and the surface plane of the contact cavity of the sensor load-bearing component, and the top surface of the bottom plate protrudes by a height δ4 compared to the lower surface of the pressure plate body.

[0016] As a further solution of the present invention: the full-scale retraction deformation of the probe of the force sensor is designed to be δ5, and the top position of the force sensor in the non-stress state is δ6 downward from the top surface of the base plate; δ2, δ6 and the plugging effect of the ordinary gasket at the plugging pad ensure that the force sensor is not subjected to stress when not in use, thereby extending its service life; the design of δ4 ensures the airtightness of the cavity and protects the force sensor from contamination by coolant, chips, etc. during processing; δ1=δ2=δ3, δ3 is greater than δ6, and δ3-δ6 is not greater than δ5, which can ensure that the top surface of the base plate and the surface plane of the contact cavity of the sensor load-bearing component are completely in contact and have good pressure bearing and pressure conduction.

[0017] As a further solution of the present invention: the upper surface of the upper cover assembly of the control box is installed with an LED light display group, a control switch, and various buttons and knobs, and the lower box body is internally installed with a control board and its corresponding electrical components, modules, connectors and accessories to integrate the electrical control circuit.

[0018] As a further solution of the present invention: the force sensor is electrically connected to the control box to measure force, and the LED light display group indications corresponding to different actual clamping force values ​​and related operating functions are realized through the feedback control loop and related electrical components in the control box.

[0019] As a further solution of the present invention: the pressure detection and feedback loop is composed of a pressure sensor, a transmitter and related electrical connections, etc., which are used to convert the changing mechanical pressing force into a voltage signal and realize the amplification of the pressure detection microvoltage signal, and feedback output to each demand end;

[0020] The pressure signal processing circuit is composed of a voltage detection relay module group, a voltage latch adjustment module and related electrical control elements, electrical connections, etc.; the voltage latch adjustment module latches the initial voltage signal corresponding to the initial and complete clamping force value through its internal latch control circuit, and classifies and adjusts the latched initial voltage through its internal voltage holding adjustment circuit. The latched initial voltage and each adjustment voltage are maintained and directly output to each corresponding input port of the voltage detection relay module group to form a comparison voltage; the voltage detection relay module group compares the value difference relationship between the input real-time detection value and each comparison voltage value through its internal voltage comparison control circuit, and correspondingly controls the opening and closing of the relay contact groups of KA2 and KA3;

[0021] The light display control circuit and power supply circuit are composed of a square battery, a unipolar control switch, a current limiting resistor, a blue LED light, a yellow LED light, a red LED light, a blue self-locking button and related relay contact groups. The corresponding LED light display is controlled by the normally open contact of the blue self-locking button and the normally open and normally closed contact conditions of each relay group.

[0022] As a further solution of the present invention: through the control design of the blue LED light, yellow LED light and red LED light integrated in the LED light display group corresponding to the light display state and the clamping state, it is used to prompt normal clamping, poor clamping and critical failure of clamping respectively.

[0023] As a further solution of the present invention: the pressure plate body is an elongated block, and is provided with a through-long hole connected to a matching threaded fastener. A sink groove is provided on the upper surface of the pressure plate body for placing and installing the control box. An inner cavity is provided at the front end of the pressure plate body, and the force sensor is screwed and installed with the pressure plate body through the mounting hole at the top of the inner cavity. The force sensor cable plug is electrically connected to the control box through the slot provided in the pressure plate body. The column and column head spring of the sensor load-bearing assembly are installed upward through the corresponding blind hole position in the pressure plate and use its bottom plate to close the sensor installation cavity. The longitudinal position is ensured by the threaded fastener provided on the side of the pressure plate and the long hole of its column. The sensor load-bearing assembly can produce a certain displacement and limit along the vertical direction of the pressure plate, and can be automatically reset to the non-force detection position through the compression spring.

[0024] When in use, the device is arranged at the required clamping points of the workpiece and its control switch is turned on. At each clamping point, the device is first used with threaded fasteners (generally a combination of nuts and studs) and adjustable pads to complete mechanical clamping of the workpiece. At this time, the force sensor also completes the detection of the initial and complete clamping force value. Press the blue self-locking button to confirm and realize the initial clamping state through the corresponding control circuit. The blue LED light is displayed. Adjust the yellow knob according to the proportional scale and press the yellow self-locking button to confirm the comparison voltage (clamping force) value when the clamping is poor. Adjust the red knob and press the red self-locking button to confirm the comparison voltage (clamping force) value when the clamping may fail. The clamping force value will change within a certain range during the subsequent workpiece processing. When it is as low as the value set by the yellow knob, the blue LED light goes out and the yellow LED light is displayed to indicate poor clamping; when it is as low as the value set by the red knob, the yellow LED light goes out and the red LED light is displayed to indicate possible clamping failure. In this way, the clamping state of the workpiece can be inspected and confirmed by directly observing the changes in the external light display. When reused, you must first reset the self-locking button, control switch and reset button, and then follow the steps.

[0025] Compared with the prior art, the beneficial effects of this application are:

[0026] 1. This application uses a pressure plate device with a built-in force sensor to detect the clamping force, and then uses an electrical control circuit to feedback, amplify, maintain, and compare the pressure signal to control the LED light display corresponding to different pressure values.

[0027] 2. The light display changes of this application can check the clamping status of the workpiece during the processing, so as to form an early warning and judgment on the abnormal fixation of the workpiece, avoid the workpiece out of tolerance or even scrap caused by abnormal fixation during the processing, and avoid the risk of workpiece movement or even falling caused by sudden or complete failure of clamping, effectively ensuring production safety.

[0028] 3. This application can directly check the clamping status of the workpiece, and form an early warning and judgment on the possible or imminent abnormal fixation or even complete clamping failure of the workpiece as a whole, so as to make timely repairs or tighten it reliably again.

[0029] 4. This application uses a sensor load-bearing component to convert the force point detection of the force sensor into the force surface detection on the lower surface of the base plate, thereby expanding the compression detection force surface, adapting to changes in the contact surface and ensuring stable force measurement.

[0030] The present application is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0032] In the attached picture:

[0033] Figure 1 This is a schematic diagram of the standard assembly structure of the pressing plate device of the present invention;

[0034] Figure 2 It is a schematic diagram of the forward axonometric measurement of the pressing plate body and the slot positions of the pressing plate device of the present invention;

[0035] Figure 3 A schematic diagram of the connection and use of the pressing plate device of the present invention and the accessories;

[0036] Figure 4 It is a schematic diagram of the use of the pressing plate device and accessories of the present invention for pressing at multiple points on a vertical workbench;

[0037] Figure 5 This is a schematic diagram of the slot positions of the sensor installation inner cavity of the pressure plate body of the pressure plate device of the present invention;

[0038] Figure 6 It is an axonometric view of the load-bearing assembly of the sensor of the pressure plate device of the present invention;

[0039] Figure 7 It is a schematic diagram of the non-stressed normal state of the load-bearing component of the pressure plate device of the present invention after installation;

[0040] Figure 8It is a partial longitudinal cross-sectional view of the sensor installation cavity and the load-bearing component contact cavity along the center line of the pressure plate device of the present invention in the non-stressed state;

[0041] Fig. 9 This is an axonometric view of a control box of a pressure plate device of the present invention;

[0042] Fig.10 It is a front view of the control box (upper box body assembly) of the pressing plate device of the present invention;

[0043] Fig.11 It is a schematic diagram of the electrical principle of the pressure detection and feedback loop and the pressure signal processing loop of the pressure plate device of the present invention;

[0044] Fig.12 It is a schematic diagram of the electrical principle of the light display control circuit and the power supply circuit of the pressure plate device of the present invention.

[0045] Explanation of numbers in the figure: 1 pressure plate body; 2 protective cover; 3 control box; 4 sensor fastening screw; 5 force sensor; 6 sensor bearing assembly; 7 sensor bearing assembly fastening screw; 11 pressure plate equipped with threaded parts to connect through-length holes; 12 control box mounting slot; 13 sensor cable slot; 14 control box mounting threaded hole; 15 sensor fastening screw mounting hole; 16 sensor bearing assembly fastening screw mounting hole; 17 sensor bearing assembly column and column head spring mounting blind hole; 18 sensor installation cavity; 19 sensor bearing assembly contact cavity; 31 control box fastening screw; 32 upper cover assembly; 33 lower box body; 34 sealing strip; 321 convex edge; 322 reset button; 323 red self-locking button; 324 yellow Self-locking button; 325 blue self-locking button; 326 yellow adjustment knob; 327 LED light display group; 328 red adjustment knob; 329 single-pole control switch; 3271 blue LED lamp; 3272 yellow LED lamp; 3273 red LED lamp; 331 RP3 potentiometer; 332 RP2 potentiometer; 333 transmitter; 334 voltage detection relay module group; 335 voltage latch adjustment module; 336 square battery; 337 current limiting resistor; 51 force sensor probe; 61 column spring; 62 column; 63 bottom plate; 631 bottom plate top surface; 632 bottom plate secondary upper surface; 633 gasket; 81 equipped with threaded fasteners; 82 equipped with adjustable pads; 91 vacuum work platform; 92 workpiece. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] See attached Figure 1 A clamping and inspection plate device for fixing workpieces on a vertical workbench, which is composed of a clamping plate body 1, a protective cover 2, a control box 3, a sensor fastening screw 4, a force sensor 5, a sensor bearing assembly 6, and a sensor bearing assembly fastening screw 7. The control box 3 is installed in the sunken groove on the upper surface of the clamping plate body 1 through the fastening screws of its own components. The protective cover 2 is a transparent, anti-pollution, wear-resistant and scratch-resistant product, which is directly buckled on the control box 3 to prevent coolant oil pollution and cutting scratches generated during the application process and does not affect the light display inspection. The force sensor 5 is installed in the front end cavity of the clamping plate body 1 through the sensor fastening screw 4, and the sensor bearing assembly 6 is installed upward at the corresponding position here and is fastened and locked in the initial position through the sensor bearing assembly fastening screw 7. The lower surface of the bottom plate of the sensor bearing assembly 6 contacts and presses the surface of the workpiece, and the force sensor 5 is electrically connected to the control box 3 and measures the force. The light display and related operation functions are realized through the feedback control circuit in the control box 3 and related electrical components.

[0048] See attached Figure 2 , Attachment Figure 3 And attached Figure 4 The through-hole 11 of the pressure plate equipped with a threaded connection is used to connect the device with its equipped threaded fastener 81, and at the same time, the mechanical compression of the workpiece 92 and the vacuum working platform 91 can be completed by using the equipped adjustable pad 82 for support. The control box mounting slot 12 is a sunken mounting position for the control box 3 on the upper surface of the pressure plate body 1. The sensor cable slot 13 is used to guide the plug cable of the force sensor 5 to the control box mounting slot 12 and electrically connect it to the control box 3. The control box mounting threaded hole 14 is used for the connection and installation of the control box 3 and the pressure plate body 1. The sensor fastening screw mounting hole 15 completes the connection and installation of the force sensor 5 and the pressure plate body 1 through the sensor fastening screw 4. See also the attached Figure 5 The sensor bearing assembly fixing screw installation hole 16 is connected and installed with the sensor bearing assembly 6 and the pressure plate body 1 through the sensor bearing assembly fixing screw 7. The sensor bearing assembly column and its column head spring installation blind hole 17 and the sensor bearing assembly contact cavity 19 are the upward installation positions of the sensor bearing assembly 6 on the lower surface of the pressure plate body 1. The sensor installation inner cavity 18 is the upward installation position of the force sensor 5 on the lower surface of the pressure plate body 1.

[0049] See attached Figure 6The sensor load-bearing assembly 6 is composed of a column spring 61, a column 62, and a base plate 63. The column spring 61 is designed as a cylindrical helical compression spring, with the inner hole sleeved on the column (guide rod) of the column 62, and the outer wall installed in the guide sleeve on the pressure plate body 1 (the sensor load-bearing assembly column and its column spring mounting hole 17), and the two ends are polished and pressure-contacted with the upper and lower mounting support surfaces respectively. A long through hole is set on the column 62, and a column is set on the top. The four columns 62 and the base plate 63 can be connected by threads, and the position tolerance of their installation must be guaranteed. The upper surface of the base plate 63 is used for contact and force measurement of the force sensor probe 51 and for pressure bearing with the surface plane of the inner cavity, and the lower surface is used for contact and compression with the workpiece, and the side is in contact and closed with the contact cavity 19 of the sensor load-bearing assembly. The sensor load-bearing component 6 is installed upward through the corresponding position of the sensor load-bearing component column and its column head spring installation blind hole 17, so that the center position of the long through hole of the column 62 is aligned with the center position of the sensor load-bearing component fixing screw installation hole 16, and the sensor load-bearing component fixing screw 7 is tightened to complete the installation. Under normal conditions without force, due to the pressure of the column head spring 61 itself, the sensor load-bearing component fixing screw 7 contacts the upper surface of the long through hole of the column 62, and contacts the lower surface of the long through hole of the column 62 when the force is limited, and the displacement limit is 1.5mm, so the sensor load-bearing component 6 can produce a vertical upward displacement of no more than 1.5mm.

[0050] See attached Figure 7 And attached Figure 8 After the installation of the sensor bearing assembly 6, it is in contact with the sensor bearing assembly contact cavity 19 and closed, with a closing height of 2mm. Under normal conditions without force, there is a non-contact gap of 1.5mm between the secondary upper surface 632 of the bottom plate and the lower surface of the pressure plate body 1. Similarly, there is a non-contact gap of 1mm between the vertex position of the force sensor probe 51 and the top surface 631 of the bottom plate. When the device is used, that is, after the sensor bearing assembly 6 is under pressure, it moves vertically upward by 1mm and contacts the force sensor probe 51, and the force sensor 5 starts to measure force. The allowable or actual preload and conduction effect of the threaded fasteners used in the pressure plate device must be considered and the force sensor probe 51 must be designed. First, it is necessary to ensure that the force is matched with the measured force and the range is appropriate; second, it is necessary to ensure that when the force sensor 5 is at full range, the retraction deformation of the force sensor probe 51 is greater than 0.5mm to ensure that the top surface 631 of the bottom plate of the sensor bearing assembly 6 is completely in contact with the surface plane of the sensor bearing assembly contact cavity 19 and the pressure is well conducted. Using a common gasket at the gasket position 633 can ensure that the force sensor 5 is not subjected to stress when not in use.

[0051] See attached Fig. 9The control box 3 is composed of a control box fastening screw 31, an upper cover assembly 32, a lower box body 33, and a sealing strip 34. The control box 3 is placed at the control box mounting slot 12, and the upper cover assembly 32 and the lower box body 33 are connected by the control box fastening screw 31, and the control box is threadedly connected to the pressure plate body 1 at the control box mounting threaded hole 14 to complete the fastening installation. The control box 3 must ensure that its peripheral side surface fits the inner surface of the slot at the control box mounting slot 12, and a sealing strip 34 installed at a certain height position is used to seal to prevent pollutants from entering and contaminating related electrical components. The upper cover assembly 32 is provided with a convex edge 321 for simple buckling with the corresponding slot in the protective cover 2, and a control switch, an LED light display group, and various buttons and knobs are installed on its upper surface. The control panel, electrical components and related accessories are built-in and installed in the lower box body 33, and are electrically connected to the force sensor 5 through the bottom through hole along the sensor cable slot 13. The internal control board of the control box 3 (lower box body 33) integrates the pressure detection and feedback circuit, the pressure signal processing circuit, the light display control circuit and the power supply circuit through corresponding electrical components, modules, connectors and their accessories. The relevant electrical hardware is selected, applied and installed according to the design principles.

[0052] See attached Fig.10 , the installation and arrangement positions of the electrical (control) components on the surface of the upper cover assembly 32 are shown, and they are connected to other components and modules on the control board inside the lower box body 33 by cables. Among them, the single-pole control switch 329 is the main power switch of the device; the reset button 322 is a normally open non-self-locking button, the red self-locking button 323 and the yellow self-locking button 324 are both normally open self-locking buttons, and the blue self-locking button 325 is a composite button that is, a normally open and normally closed contact group is set; the yellow adjustment knob 326 and the red adjustment knob 328 are both potentiometer knobs; the LED light display group 327 is integrated with a blue LED light 3271, a yellow LED light 3272 and a red LED light 3273 in the light-transmitting cover.

[0053] See attached Fig.11 And attached Fig.12, electrical components and modules such as the 331RP3 potentiometer belonging to the lower box body 33 are all installed on the control board and electrically connected to other components. The square battery 336 is the only power supply. After the single-pole control switch 329 is closed, the entire electrical control side of the pressing plate device is powered on. Among them, the +9V and 0V COM terminal groups are both power supply shunt input terminals. The upper dotted box shows the electrical principle schematic diagram of the pressure detection and feedback circuit. The force sensor 5 is used to detect the changing mechanical pressing force, convert it into a voltage signal and output it in analog form; the transmitter 331 is connected to the force sensor 5 by aviation plug to amplify the micro-voltage signal of pressure detection. Its +UOUT(0V COM) terminal group is the feedback output terminal of the amplified pressure detection voltage signal; at this time, the initial and fully pressed force value after the pressing plate device completes pressing at the workpiece pressing point is output through the +UOUT(0V COM) terminal group of the pressure detection and feedback circuit to the +UIN(0V COM) terminal group of the voltage latch adjustment module 333 to provide the corresponding initial voltage signal, and is output to the U+ and U- terminal groups of the voltage detection relay module group 332 to provide the real-time detection voltage signal. The lower dotted box shows the electrical principle schematic diagram of the pressure signal processing circuit. The blue self-locking button 325 at the SB1IN end is in the shown position. The voltage latch adjustment module 333 directly latches and maintains the output to the U lock 1+ and U lock 1- terminal groups through its internal latch control circuit for the initial voltage signal input to the +UIN(0V COM) terminal group. At this time, after the blue self-locking button 325 is closed, it disconnects the external input, and controls the blue LED light 3271 to light up through the light display control circuit to indicate normal pressing; when the enabling SB2 IN end, that is, the yellow self-locking button 324 is closed, the RP2 potentiometer 332 is adjusted through the yellow adjustment knob 326 to obtain the adjusted voltage of an initial voltage shunt and maintain the output to the U adjustment 2+ and U adjustment 2- terminal groups, that is, to form the set value corresponding to the yellow LED control; similarly, when the enabling SB3 IN end, that is, the red self-locking button 323 is closed, the RP3 potentiometer 331 is adjusted through the red adjustment knob 328 to obtain the adjusted voltage of the second initial voltage shunt and maintain the output to the U adjustment 3+ and U adjustment 3- terminal groups, that is, to form the set value corresponding to the red LED control; the normally open contact of the reset button 322 is connected to the RESET end, and closing it can reset the internal latched voltage. The voltage detection relay module group 332 compares the value difference relationship between the real-time detected input voltage (reflecting the existing pressing force) of the U+ and U- terminal groups and the input voltages of the U comparison 2+ and U comparison 2- terminal groups and the U comparison 3+ and U comparison 3- terminal groups through its internal voltage comparison control circuit, correspondingly controls the opening and closing of the relay contact groups of KA2 and KA3 and outputs them. At the same time, the U comparison 3 voltage value is less than the U comparison 2 voltage value.Combined with the light display control circuit and the power supply circuit, after each circuit is powered, when the real-time voltage value of the U+ and U- terminals is less than the set voltage value of the U ratio 2+ and U ratio 2- terminals, the KA2 NO contact is closed and the NC contact is opened, the blue LED light 3271 is off and the yellow LED light 3272 is on, which is used to indicate poor compression; similarly, when the real-time voltage value of the U+ and U- terminals is less than the set voltage value of the U ratio 3+ and U ratio 3- terminals, the KA3 NO contact is closed and the NC contact is opened, the yellow LED light 3272 is off and the red LED light 3273 is on, which is used to indicate critical compression failure. The overall application process is implemented according to the design steps. The current limiting resistor 337 is used to reduce the voltage and limit the current of the LED light control voltage in the light display control circuit.

[0054] When using this device, first use it with its accessories to complete the mechanical clamping of the workpiece. After the clamping force meets the requirements, follow the steps to set the function operation on the electrical control side. After completion, when the workpiece enters the processing process, its clamping status can be directly checked through the LED light display. By mastering the clamping status of each clamping point (normal clamping, poor clamping, critical clamping failure), an early warning and judgment of the possible or imminent abnormal fixation or even complete clamping failure of the workpiece as a whole is formed, so that timely repairs or reliable tightening can be carried out again, avoiding the huge losses caused by the abnormal fixation or even scrapping of the workpiece during the processing process, and avoiding the risk of workpiece movement or even falling caused by sudden or complete clamping failure, effectively ensuring production safety.

[0055] So far, the purpose of the present invention has been achieved.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressing plate device capable of pressing and inspecting, characterized in that: The pressing plate device is a mechatronic device, comprising: The mechanical part includes a pressure plate body, a control box and a force sensor. The control box is buckled with a protective cover on the outer surface and is installed on the pressure plate body. The force sensor is installed on the pressure plate body. A sensor bearing assembly is encapsulated at the bottom of the force sensor. The electrical hardware part includes power supply, LED indicator display group, force sensor, control panel and corresponding electrical components, self-locking button group, adjustment knob group, reset button, switch and other electrical control and electrical connection accessories; The electrical control circuit includes a pressure detection and feedback circuit, a pressure signal processing circuit, and a light display control circuit.

2. A pressing plate device capable of being pressed and inspected according to claim 1, characterized in that: The positions, shapes, dimensions and thread characteristics of the slots and holes of the pressure plate body are adaptively designed according to the installation methods of different components.

3. A pressing plate device capable of being pressed and inspected according to claim 2, characterized in that: The control box is composed of a control box fastening screw, an upper cover assembly, a lower box body, and a sealing strip. The upper cover assembly and the lower box body are connected by the control box fastening screws, and are threadedly connected to the pressure plate body at the sunken groove position on the upper surface to complete the fastening installation.

4. A pressing plate device capable of being pressed and inspected according to claim 3, characterized in that: The protective cover is simply buckled with the convex edge of the upper cover assembly through the corresponding groove inside the protective cover.

5. A pressing plate device capable of being pressed and inspected according to claim 1, characterized in that: The force sensor is upwardly mounted in the front end cavity of the pressure plate body through the sensor fastening screw, and the sensor force bearing component is upwardly mounted at the corresponding position here and is fastened and locked in the initial position through the sensor force bearing component fastening screw.

6. A pressing plate device capable of being pressed and inspected according to claim 5, characterized in that: The sensor load-bearing component is composed of a column head spring, a column, and a bottom plate, and the lower surface of the bottom plate is in contact with and pressed against the surface of the workpiece.

7. A pressing plate device capable of being pressed and inspected according to claim 6, characterized in that: The sensor load-bearing component, through its structural design, ensures self-reset in the normal position by the application and installation of the compression spring of the column head spring, ensures the up and down displacement distance δ1 by the coordinated installation of the long through hole of the column and the fixing screw of the sensor load-bearing component, and ensures the non-contact gap δ2 between the secondary upper surface of the bottom plate and the lower surface of the pressure plate body in the non-stress state by the thickness size and installation position of the bottom plate, the non-contact gap δ3 between the top surface of the bottom plate and the surface plane of the contact cavity of the sensor load-bearing component, and the top surface of the bottom plate protrudes by a height δ4 compared with the lower surface of the pressure plate body.

8. A pressing plate device capable of being pressed and inspected according to claim 7, characterized in that: The full-scale retraction deformation of the probe of the force sensor is designed to be δ5, and the distance between its top position and the top surface of the base plate in the non-stress state is δ6; δ2, δ6 and the plugging effect of ordinary gaskets at the plugging pads ensure that the force sensor is not subjected to stress when not in use, thereby extending its service life; the design of δ4 ensures the airtightness of the cavity and protects the force sensor from contamination by coolant, chips, etc. during processing; δ1=δ2=δ3, δ3 is greater than δ6, and δ3-δ6 is not greater than δ5, which can ensure that the top surface of the base plate and the surface plane of the contact cavity of the sensor load-bearing component are completely in contact and have good pressure-bearing and pressure-conducting properties.

9. A pressing plate device capable of being pressed and inspected according to claim 1, characterized in that: The upper surface of the upper cover assembly of the control box is equipped with an LED light display group, a control switch, and various buttons and knobs, and the lower box body is internally installed with a control board and its corresponding electrical components, modules, connectors and accessories to integrate the electrical control circuit; The force sensor is electrically connected to the control box and performs force measurement, and the LED light display group indications corresponding to different actual clamping force values ​​and related operating functions are realized through the feedback control loop and related electrical components in the control box.

10. A pressing plate device capable of being pressed and inspected according to claim 1, characterized in that: The pressure detection and feedback loop is composed of a pressure sensor, a transmitter and related electrical connections, etc., which are used to convert the changing mechanical pressing force into a voltage signal and amplify the pressure detection microvoltage signal, and feedback it to each demand end; The pressure signal processing circuit is composed of a voltage detection relay module group, a voltage latch adjustment module and related electrical control elements, electrical connections, etc.; the voltage latch adjustment module latches the initial voltage signal corresponding to the initial and complete clamping force value through its internal latch control circuit, and classifies and adjusts the latched initial voltage through its internal voltage holding adjustment circuit. The latched initial voltage and each adjustment voltage are maintained and directly output to each corresponding input port of the voltage detection relay module group to form a comparison voltage; the voltage detection relay module group compares the value difference relationship between the input real-time detection value and each comparison voltage value through its internal voltage comparison control circuit, and correspondingly controls the opening and closing of the relay contact groups of KA2 and KA3; The light display control circuit and power supply circuit are composed of a square battery, a unipolar control switch, a current limiting resistor, a blue LED light, a yellow LED light, a red LED light, a blue self-locking button and related relay contact groups. The corresponding LED light display is controlled by the normally open contact of the blue self-locking button and the normally open and normally closed contact conditions of each relay group.

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