Tension fine adjustment mechanism of photogravure press

Abstract

The tension fine adjustment mechanism comprises a machine body, a base is arranged at the bottom of the machine body, a printing structure is arranged on the machine body, a control unit is further arranged in the machine body, and the control unit is in transmission connection with the printing structure. The control unit comprises a central control module, a wireless communication module, a display module, a voice alarm module, a hydraulic driving module, a motor driving module and a pressure detection module, and the wireless communication module, the display module, the voice alarm module, the hydraulic driving module, the motor driving module and the pressure detection module are connected with the central control module. Meanwhile, other modules are controlled to work, intelligent operation of the printing machine is achieved, a pressure detection circuit can accurately measure a pressure signal, and the operation stability of the printing machine is improved; moreover, the tension fine adjustment mechanism can adjust the tension when the tension of the freshness protection bag film changes or the first tension roller and the second tension roller move, so that the printing stability is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of printing machines, in particular to a tension fine-adjusting mechanism of a gravure printing machine. Background Art

[0002] Existing large-scale printing machines only have start-stop functions, and some have detection sensing functions, which can shut down when the printed paper is abnormally wound. However, with the increasing popularity of intelligent technology, the requirements for the intelligence of printing machines are getting higher and higher. Not only that, during the winding detection process of the printing machine, the printing machine often stops unexpectedly due to interference signals, which in turn affects the working progress of the printing machine and even affects its service life; moreover, tension rollers are generally equipped with two to ensure sufficient tension and achieve printing stability. The material of the plastic bag film and the deviation of the tension roller will affect the tension control of the printed paper.

[0003] In summary, it is imperative to design a mechanism that can fine-tune the tension for a gravure printing machine. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings, the utility model provides a tension fine-adjusting mechanism for a gravure printing machine.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A tension fine-adjusting mechanism for a gravure printing machine comprises a body, a base is arranged at the bottom of the body, a printing structure is arranged on the body, a control unit is arranged inside the body, the control unit is transmission-connected with the printing structure, the control unit comprises a central control module, a wireless communication module connected with the central control module, a display module, a voice alarm module, a hydraulic drive module, a motor drive module and a pressure detection module, and a tension fine-adjusting structure is arranged above the printing structure;

[0007] The tension fine-tuning structure includes a first motor, a lead screw, a threaded sleeve, a slider, a third tension roller, a support and a displacement sensor. The first motor is connected to the lead screw in a transmission manner. The first motor is horizontally fixed on the machine body. The lead screw matches the thread of the inner wall of the threaded sleeve, and the lead screw is connected to the threaded sleeve in a transmission manner. The threaded sleeve is fixed on one side of the slider, the support is fixed on the machine body, the slider slides left and right between the two supports, the third tension roller is arranged on the slider, and a displacement sensor is arranged on the front side of the direction in which the slider moves.

[0008] The pressure detection module includes a pressure detection circuit, which includes a first operational amplifier, a second operational amplifier, a third operational amplifier, a fourth operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first capacitor, a second capacitor and a third capacitor. The non-inverting input terminal of the first operational amplifier is electrically connected to the inverting input terminal of the second operational amplifier through the first resistor, the non-inverting input terminal of the second operational amplifier is grounded, the non-inverting input terminal of the first operational amplifier is electrically connected to the output terminal of the first operational amplifier through the second resistor, and the inverting input terminal of the second operational amplifier is electrically connected to the output terminal of the second operational amplifier through the third resistor. The output end of the first operational amplifier is electrically connected to the inverting input end of the third operational amplifier through the first capacitor and the fourth resistor, the output end of the second operational amplifier is electrically connected to the non-inverting input end of the third operational amplifier through the second capacitor and the fifth resistor, the non-inverting input end of the third operational amplifier is grounded through the seventh resistor, the inverting input end of the third operational amplifier is electrically connected to the output end of the third operational amplifier through the sixth resistor, the output end of the third operational amplifier is electrically connected to the non-inverting input end of the fourth operational amplifier through the third capacitor, both ends of the third capacitor are grounded through the eighth resistor and the ninth resistor respectively, the inverting input end of the fourth operational amplifier is grounded through the tenth resistor, and the inverting input end of the fourth operational amplifier is connected to the output end of the fourth operational amplifier through the eleventh resistor.

[0009] Preferably, the printing structure includes a winding roller, a printing roller, a first tension roller and a second tension roller, the winding roller is located below the printing roller, the first tension roller and the second tension roller are located above the printing roller, the first tension roller is higher than the second tension roller, the winding roller, the printing roller, the first tension roller and the second tension roller are all transmission-connected to the second motor, the second motor is electrically connected to the motor drive module, the third tension roller is located above the first tension roller and the second tension roller, the second motor drives the corresponding winding roller, printing roller, first tension roller and second tension roller to work, after the printing paper is first printed by the printing roller, it passes through the first tension roller and the second tension roller in sequence for tension stretching, thereby ensuring printing and subsequent winding work, and finally the printing paper is wound by the winding roller.

[0010] Preferably, the display module is electrically connected to a display screen, the central control module sends a display signal to the display module, the display module decodes the signal, and then controls the display screen to display relevant images, the voice alarm module is electrically connected to a speaker, the central control module sends a voice signal to the voice alarm module, the voice alarm module converts the signal into a control signal to control the speaker to output relevant voice, the hydraulic drive module is electrically connected to a hydraulic pump, the central control module sends a hydraulic drive signal to the hydraulic drive module, and the hydraulic drive module then drives the hydraulic pump to work.

[0011] Preferably, a pressure sensor is provided at the first tension roller and the second tension roller, and the pressure sensor is electrically connected to the pressure detection circuit. The pressure sensor detects the pressure signal on the first tension roller and the second tension roller, and the pressure signal is transmitted to the central control module through the pressure detection circuit.

[0012] Preferably, the models of the first operational amplifier, the second operational amplifier, the third operational amplifier and the fourth operational amplifier are all AD797-21.

[0013] The beneficial effects of the utility model are as follows: in the tension fine-tuning mechanism of the gravure printing machine, the central control module collects the working conditions of each component in the printing structure through the pressure detection module, and controls the work of other modules at the same time to realize the intelligent operation of the printing machine, wherein the pressure detection circuit can accurately measure the pressure signal, thereby improving the stability of the operation of the printing machine; moreover, the tension fine-tuning mechanism can adjust the tension when the tension of the fresh-keeping bag film changes or the first tension roller and the second tension roller move, thereby ensuring the stability of printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is the system principle diagram of the utility model;

[0017] Figure 3 It is a circuit principle diagram of the pressure detection circuit of the utility model;

[0018] Figure 4 It is a structural schematic diagram of the tension fine-adjusting mechanism of the utility model. DETAILED DESCRIPTION

[0019] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0020] like Figure 1-Figure 4 As shown, a tension fine-adjusting mechanism of a gravure printing machine comprises a body 1, a base 2 is provided at the bottom of the body 1, a printing structure is provided on the body 1, a control unit is further provided inside the body 1, the control unit is transmission-connected with the printing structure, the control unit comprises a central control module, a wireless communication module connected with the central control module, a display module, a voice alarm module, a hydraulic drive module, a motor drive module and a pressure detection module, and a tension fine-adjusting structure is provided above the printing structure;

[0021] The tension fine-tuning structure includes a first motor 8, a lead screw 12, a threaded sleeve 13, a slider 9, a third tension roller 10, a support 11 and a displacement sensor 7. The first motor 8 is connected to the lead screw 12 in transmission, and the first motor 8 is horizontally fixed on the fuselage 1. The lead screw 12 matches the thread of the inner wall of the threaded sleeve 13, and the lead screw 12 is connected to the threaded sleeve 13 in transmission. The threaded sleeve 13 is fixed on one side of the slider 9, and the support 11 is fixed on the fuselage 1. The slider 9 slides left and right between the two supports 11. The third tension roller 10 is arranged on the slider 9. The displacement sensor 7 is provided on the front side of the moving direction of the slider 9. The third tension roller 10 is located above the first tension roller 5 and the second tension roller 6.

[0022] The working principle of the tension fine-tuning structure is that the displacement sensor 7 can monitor the position of the slider 9 in real time, so that the displacement data can be converted into tension data through the central control module 14. At this time, the central control module 14 controls the first motor 8 to work through the motor drive module 16. The first motor 8 can make the threaded sleeve 13 move back and forth through the screw 12. Similarly, the threaded sleeve 13 can move back and forth with the slider 9 between the two supports 11, thereby realizing the third tension roller 10 to adjust the tension of the fresh-keeping bag film.

[0023] The working principle of the tension fine-tuning mechanism of the gravure printing machine is that the central control module collects the working conditions of each component in the printing structure through the pressure detection module, and controls the work of other modules at the same time to realize the intelligent operation of the printing machine, wherein the wireless communication module is used to wirelessly connect with the external communication terminal to realize the remote control function of the printing machine, the display module can control the display screen to display the relevant data screen according to the display signal sent by the central control module; the voice alarm module can control the speaker to give the relevant voice information alarm prompt according to the alarm signal sent by the central control module; the hydraulic drive module controls the corresponding hydraulic pump to work after collecting the hydraulic drive signal sent by the central control module; similarly, the motor drive module controls the corresponding motor to work after collecting the motor drive signal sent by the central control module, and the pressure detection module is used to detect the pressure of each working roller in the printing structure, and the signal is transmitted to the central control module. When printing, there will be no printing interruption due to tension problems.

[0024] The pressure detection module includes a pressure detection circuit, which includes a first operational amplifier U1, a second operational amplifier U2, a third operational amplifier U3, a fourth operational amplifier U4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first capacitor C1, a second capacitor C2 and a third capacitor C3. The in-phase input terminal of the first operational amplifier U1 is electrically connected to the inverting input terminal of the second operational amplifier U2 through the first resistor R1, the in-phase input terminal of the second operational amplifier U2 is grounded, the in-phase input terminal of the first operational amplifier U1 is electrically connected to the output terminal of the first operational amplifier U1 through the second resistor R2, and the inverting input terminal of the second operational amplifier U2 is electrically connected to the output terminal of the second operational amplifier U2 through the third resistor R3. The first operational amplifier U1 is electrically connected to the inverting input terminal of the third operational amplifier U3 through the first capacitor C1 and the fourth resistor R4, the output terminal of the second operational amplifier U2 is electrically connected to the non-inverting input terminal of the third operational amplifier U3 through the second capacitor C2 and the fifth resistor R5, the non-inverting input terminal of the third operational amplifier U3 is grounded through the seventh resistor R7, the inverting input terminal of the third operational amplifier U3 is electrically connected to the output terminal of the third operational amplifier U3 through the sixth resistor R6, the output terminal of the third operational amplifier U3 is electrically connected to the non-inverting input terminal of the fourth operational amplifier U4 through the third capacitor C3, both ends of the third capacitor C3 are grounded through the eighth resistor R8 and the ninth resistor R9, the inverting input terminal of the fourth operational amplifier U4 is grounded through the tenth resistor R10, and the inverting input terminal of the fourth operational amplifier U4 is connected to the output terminal of the fourth operational amplifier U4 through the eleventh resistor R11.

[0025] In the pressure detection circuit, the first operational amplifier U1 and the second operational amplifier U2 form a differential amplifier circuit, and the interference signal is filtered by a filter circuit composed of a first capacitor C1 and a fourth resistor R4, a second capacitor C2 and a fifth resistor R5, and then a signal amplification circuit mainly composed of the third operational amplifier U3 is used to amplify the signal, and then a bandpass filter circuit composed of a third capacitor C3, an eighth resistor R8 and a ninth resistor R9 is used to filter the interference signal for a second time, and finally a signal amplification circuit mainly composed of the fourth operational amplifier U4 is used to amplify the signal, thereby achieving the accuracy of pressure detection.

[0026] Specifically, the printing structure includes a winding roller 3, a printing roller 4, a first tension roller 5 and a second tension roller 6. The winding roller 3 is located below the printing roller 4, the first tension roller 5 and the second tension roller 6 are located above the printing roller 4, the first tension roller 5 is higher than the second tension roller 6, the winding roller 3, the printing roller 4, the first tension roller 5 and the second tension roller 6 are all transmission-connected to the second motor, the second motor is electrically connected to the motor drive module, the third tension roller 10 is located above the first tension roller 5 and the second tension roller 6, the second motor drives the corresponding winding roller 3, the printing roller 4, the first tension roller 5 and the second tension roller 6 to work, after the printing paper is first printed by the printing roller 4, it passes through the first tension roller 5 and the second tension roller 6 in sequence for tension stretching, thereby ensuring printing and subsequent winding work, and finally the printing paper is wound by the winding roller 3.

[0027] Specifically, the display module is electrically connected to a display screen, the central control module sends a display signal to the display module, the display module decodes the signal, and then controls the display screen to display relevant images, the voice alarm module is electrically connected to a speaker, the central control module sends a voice signal to the voice alarm module, the voice alarm module converts the signal into a control signal to control the speaker to output relevant voices, the hydraulic drive module is electrically connected to a hydraulic pump, the central control module sends a hydraulic drive signal to the hydraulic drive module, and the hydraulic drive module then drives the hydraulic pump to work.

[0028] Specifically, pressure sensors are provided at the first tension roller 5 and the second tension roller 6. The pressure sensors are electrically connected to the pressure detection circuit. The pressure sensors detect pressure signals on the first tension roller 5 and the second tension roller 6. The pressure signals are transmitted to the central control module through the pressure detection circuit.

[0029] Specifically, the models of the first operational amplifier U1, the second operational amplifier U2, the third operational amplifier U3 and the fourth operational amplifier U4 are all AD797-21.

[0030] The above is based on the enlightenment of this utility model. Through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of ​​this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A tension fine-adjusting mechanism for a gravure printing press, characterized in that: It includes a fuselage, a base is provided at the bottom of the fuselage, a printing structure is provided on the fuselage, a control unit is also provided inside the fuselage, the control unit is transmission-connected with the printing structure, the control unit includes a central control module, a wireless communication module connected with the central control module, a display module, a voice alarm module, a hydraulic drive module, a motor drive module and a pressure detection module, and a tension fine-tuning structure is provided above the printing structure; The tension fine-tuning structure includes a first motor, a lead screw, a threaded sleeve, a slider, a third tension roller, a support and a displacement sensor. The first motor is connected to the lead screw in a transmission manner. The first motor is horizontally fixed on the machine body. The lead screw matches the thread of the inner wall of the threaded sleeve, and the lead screw is connected to the threaded sleeve in a transmission manner. The threaded sleeve is fixed on one side of the slider, the support is fixed on the machine body, the slider slides left and right between the two supports, the third tension roller is arranged on the slider, and a displacement sensor is arranged on the front side of the direction in which the slider moves. The pressure detection module includes a pressure detection circuit, which includes a first operational amplifier, a second operational amplifier, a third operational amplifier, a fourth operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first capacitor, a second capacitor and a third capacitor. The non-inverting input terminal of the first operational amplifier is electrically connected to the inverting input terminal of the second operational amplifier through the first resistor, the non-inverting input terminal of the second operational amplifier is grounded, the non-inverting input terminal of the first operational amplifier is electrically connected to the output terminal of the first operational amplifier through the second resistor, and the inverting input terminal of the second operational amplifier is electrically connected to the output terminal of the second operational amplifier through the third resistor. The output end of the first operational amplifier is electrically connected to the inverting input end of the third operational amplifier through the first capacitor and the fourth resistor, the output end of the second operational amplifier is electrically connected to the non-inverting input end of the third operational amplifier through the second capacitor and the fifth resistor, the non-inverting input end of the third operational amplifier is grounded through the seventh resistor, the inverting input end of the third operational amplifier is electrically connected to the output end of the third operational amplifier through the sixth resistor, the output end of the third operational amplifier is electrically connected to the non-inverting input end of the fourth operational amplifier through the third capacitor, both ends of the third capacitor are grounded through the eighth resistor and the ninth resistor respectively, the inverting input end of the fourth operational amplifier is grounded through the tenth resistor, and the inverting input end of the fourth operational amplifier is connected to the output end of the fourth operational amplifier through the eleventh resistor.

2. The tension fine-adjusting mechanism of the gravure printing press according to claim 1, characterized in that: The printing structure includes a winding roller, a printing roller, a first tension roller and a second tension roller. The winding roller is located below the printing roller, the first tension roller and the second tension roller are located above the printing roller, the first tension roller is higher than the second tension roller, the winding roller, the printing roller, the first tension roller and the second tension roller are all transmission-connected to the second motor, the second motor is electrically connected to the motor drive module, and the third tension roller is located above the first tension roller and the second tension roller.

3. The tension fine-adjusting mechanism of the gravure printing press according to claim 1, characterized in that: The display module is electrically connected to a display screen, the voice alarm module is electrically connected to a speaker, and the hydraulic drive module is electrically connected to a hydraulic pump.

4. The tension fine-adjusting mechanism of the gravure printing press according to claim 2, characterized in that: The first tension roller and the second tension roller are provided with pressure sensors, and the pressure sensors are electrically connected to the pressure detection circuit.

5. The tension fine-adjusting mechanism of the gravure printing press according to claim 1, characterized in that: The models of the first operational amplifier, the second operational amplifier, the third operational amplifier and the fourth operational amplifier are all AD797-21.

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