High-precision printing press

Abstract

The application discloses a high-precision printing machine, which comprises a wallboard, a first roller and a second roller connected to the wallboard, a first roller pillow connected to the first roller, a second roller pillow connected to the second roller, and a temperature control device and a protective cover, wherein the temperature control device comprises an oil tank, an oil pump and a nozzle, the nozzle is connected to the oil tank through the oil pump, a heating rod and a first temperature sensor for measuring the temperature of oil are arranged in the oil tank, the protective cover is arranged outside the first roller pillow and the second roller pillow, a second temperature sensor for measuring the temperature of the first roller pillow and the second roller pillow is arranged in the protective cover, the nozzle extends into the protective cover, and the bottom of the protective cover is connected to the oil tank through a pipeline, so that the temperature can be controlled in advance, and the pressure can be adjusted only once, and the pressure between the two roller pillows is stable during the printing process, and the equipment runs stably.

Description

Technical Field

[0001] This invention belongs to the field of printing press technology, and more specifically, it designs a high-precision printing press. Background Technology

[0002] Chinese Patent Publication No. CN113002130A discloses a method for controlling the pressure of rollers in a printing press. The method involves determining the pressure between a first roller on a first roller and a second roller on a second roller using a strain sensor. One of the rollers is adjusted relative to the other using a servo drive. The strain sensor measures the strain of the component supporting the first and second rollers. In a first step, a first measurement value is obtained in a "Druck ab" mode, and in a second step, a second measurement value is obtained in a "Druckan" mode. The rollers are in contact with each other in the "Druckan" mode and not in contact in the "Druckan" mode.

[0003] Each time a printing job is changed, the individual measurements from the strain sensors are stored as reference values ​​(when the corresponding printing press stops printing). If the machine speed equals the actual printing speed, the measurement process is initiated. A predetermined number of roller rotations (Umdrehung) is waited for. This number can be, for example, 5 to 20. Most of the filter's oscillation and saturation occur during machine acceleration. As a next step, a predetermined number of rotations of the rollers, and subsequently the bolsters, are measured using strain sensors located on the drive and operating sides of the printing press. The number of rotations measured during this period can be, for example, 5 to 20. An average is formed in the computer based on the measured values, where this calculation is the value for each pair of bolsters. The reference value is subtracted from the average. Subsequently, the strain signal is converted into a force signal, for example, by using a lookup table. During a printing job, only a portion of the above process is repeated. This portion begins with the third step (waiting for a predetermined number of rotations). Each time a printing job is changed, the entire above process, beginning with the first step (storing the individual sensor values ​​as reference values), is repeated.

[0004] In the aforementioned patented technology, the pressure parameters between the two rollers are measured by a strain sensor, and then the pressure between the two rollers is adjusted to a standard value by a servo driver. This standard value is the value measured when the two rollers are in normal working condition, that is, the rollers are running stably and the rollers are at the working temperature.

[0005] In the aforementioned patented technology, the strain sensor and servo driver operate as follows: 1. From the printing shutdown to the printing start-up stage, the rollers rotate a certain number of revolutions during this stage. The strain sensor then measures the parameters, and the servo driver adjusts accordingly. 2. From the printing start-up stage to the normal working state of the rollers, the temperature gradually increases as the rollers rotate, and the volume of the rollers expands accordingly. The pressure between the rollers changes constantly, and the servo driver continuously adjusts according to the pressure changes. This adjustment is frequent and occurs during the printing start-up process, making it difficult to perform linear pressure regulation. The pressure is unstable for a long time during the high-speed operation of the rollers, which can easily cause overpressure deformation or damage to components. At the same time, the unstable pressure also leads to unstable printing quality between the rollers. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a method that uses high-temperature oil to heat the first and second rollers before printing, bringing them to their normal operating temperature for pre-expansion. Then, printing is initiated, bringing the first and second rollers into contact. A strain sensor and servo driver are used for one-time pressure adjustment, eliminating the need for frequent pressure adjustments throughout the printing process. This ensures stable pressure between the two rollers, stable equipment operation, and guaranteed printing accuracy.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a high-precision printing machine, comprising a wall panel, on which a first roller and a second roller are connected, the first roller being connected to a first roller bolster, the second roller being connected to a second roller bolster, the second roller bolster having the same structure as the first roller bolster, and further comprising a temperature control device and a protective cover, the temperature control device comprising an oil tank, an oil pump and a nozzle, the nozzle being connected to the oil tank via the oil pump, the oil tank being provided with a heating rod and a first temperature sensor for measuring the oil temperature, the protective cover covering the outside of the first roller bolster and the second roller bolster, the protective cover being provided with a second temperature sensor for measuring the temperature of the first roller bolster and the second roller bolster, the nozzle extending into the protective cover, and the bottom of the protective cover being connected to the oil tank via a pipe;

[0008] Its operation method is as follows:

[0009] S1: Obtain the current normal operating temperature t1 of the first and second rollers;

[0010] S2: Before printing is started, i.e. when printing is stopped, the oil in the oil tank is heated to t1 by heating rod, causing the first and second rollers to rotate, the oil pump is started, and the oil is sprayed onto the first and second rollers through the nozzle. The temperature of the first and second rollers is measured by the second temperature sensor until the temperature of the first and second rollers reaches t1.

[0011] S3: The first roller and the second roller come into contact with each other, printing is enabled, the pressure between the first roller and the second roller is determined by a strain sensor, and the pressure between the first roller and the second roller is adjusted by a servo driver.

[0012] The nozzle further includes a first nozzle for spraying a first roller and a second nozzle for spraying a second roller. The first nozzle and the second nozzle are respectively oriented toward the circumferential surfaces of the first roller and the second roller. The first nozzle is oriented toward the bottom position of the first roller, and the second nozzle is located at the bottom position of the second roller. The spraying direction of the first nozzle is opposite to the rotation direction of the first roller, and the spraying direction of the second nozzle is opposite to the rotation direction of the second roller.

[0013] Furthermore, one side of the first and second rollers is a C1 surface and the other side is a C2 surface. There are two first nozzles, one of which is inclined towards the C1 surface and the other is inclined towards the C2 surface. The two first nozzles are staggered from each other in the vertical direction. There are also two second nozzles, one of which is inclined towards the C1 surface and the other is inclined towards the C2 surface. The two second nozzles are staggered from each other in the vertical direction. A filter element is provided between the oil tank and the oil pump.

[0014] Furthermore, U-shaped anti-splash grooves are provided on both the C1 and C2 surfaces of the first roller ram, with the openings of the anti-splash grooves facing the outer circumferential surface of the first roller ram; an oil receiving groove with a U-shaped cross-section is provided on the inner side of the protective cover, with the outer diameter of the oil receiving groove being smaller than that of the anti-splash groove, the opening of the oil receiving groove facing the anti-splash groove, and the projection portions of the oil receiving groove and the anti-splash groove on the axis overlapping.

[0015] Furthermore, a splash guard is provided at the position below the splash guard groove corresponding to the protective cover. The splash guard is in the shape of a downward arc and there is a gap between the splash guard and the splash guard groove in the vertical direction. The projection of the splash guard and the splash guard groove on the axis overlaps.

[0016] Furthermore, the first roller is annular, and a limiting step is provided on the side of the first roller. A positioning shaft is provided on the side of the limiting step. The first roller is sleeved on the positioning shaft, and one side of the first roller abuts against the side of the limiting step. The first roller and the limiting step are fixed by fasteners.

[0017] Furthermore, the protective cover is divided into a first part and a second part with the axial connection surface of the first roller and the second roller as the cross surface, and the first part and the second part are detachably connected.

[0018] Furthermore, both the first and second parts are provided with connecting ears, which are connected by fasteners.

[0019] Furthermore, the wall panel is provided with fixing ears, and there are mounting grooves between the connecting ears facing the side of the wall panel for the fixing ears to extend into.

[0020] Furthermore, the protective cover is divided into a third part and a fourth part with the axial midpoint of the first roller as the cross-section. Several opening and closing mechanisms are provided between the third part and the fourth part. The opening and closing mechanism includes a threaded sleeve, a screw, and a compression spring. The threaded sleeve and the screw are respectively connected to the third part and the fourth part. The threaded sleeve has two threads with a blank section between them. The end of the screw has a thread. The two ends of the compression spring abut against the third part and the fourth part.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. Before printing begins, the first and second rollers are heated with oil to reach the specified working temperature and expand in advance, so that pressure adjustment can be completed in one go after printing begins.

[0023] 2. No frequent pressure adjustments are required, ensuring stable printing and high printing accuracy;

[0024] 3. The oil used to heat the first and second rollers is also used as the cleaning oil for the first and second rollers to remove any impurities and ensure smooth operation between them.

[0025] 4. The oil creates an oil film between the first and second rollers, reducing wear on the contact surfaces;

[0026] 5. The detachable first and second rollers can be replaced after deformation or damage without replacing the entire roller;

[0027] 6. The detachable structure of the protective cover not only prevents external dust from entering and avoids oil splashing, but also allows for individual disassembly and assembly of the protective cover. Attached Figure Description

[0028] Figure 1 This is the logic control diagram in this invention;

[0029] Figure 2 A three-dimensional structural diagram showing the cooperation between the protective cover, the first roller, and the second roller;

[0030] Figure 3 Front view showing the cooperation of the protective cover, the first roller, and the second roller;

[0031] Figure 4 for Figure 3 Sectional view at point AA;

[0032] Figure 5 This is a side view of the first roller;

[0033] Figure 6 This is a cross-sectional view of the protective shield;

[0034] Figure 7 This is a three-dimensional structural diagram of the inside of the protective shield;

[0035] Figure 8 This is a front view of the inside of the protective shield;

[0036] Figure 9 A three-dimensional structural diagram of the first roller when it separates from the first bolster;

[0037] Figure 10 A three-dimensional structural diagram of the first roller bolster and the first drum combined;

[0038] Figure 11 This is a schematic diagram of the opening and closing mechanism when it is closed;

[0039] Figure 12 This is a schematic diagram of the opening and closing mechanism when it is open;

[0040] Figure 13 This is a three-dimensional structural diagram of the protective cover combined with the wall panel.

[0041] Reference numerals: 11, First roller; 111, Splash preventer; 12, Second roller; 2, Protective cover; 21, First part; 22, Second part; 23, Third part; 231, Oil receiving groove; 232, Splash preventer; 24, Fourth part; 25, Connecting lug; 251, Mounting groove; 26, Opening and closing mechanism; 252, Threaded sleeve; 262, Screw; 263, Compression spring; 31, First nozzle; 32, Second nozzle; 41, First roller; 51, Limiting step; 52, Positioning shaft; 53, Journal; 54, Shaft head; 61, First temperature sensor; 62, Second temperature sensor; 7, Oil pump; 8, Oil groove; 81, Heating rod; 9, Wall panel; 91, Fixing lug. Detailed Implementation

[0042] Reference Figures 1 to 13 The embodiments of the high-precision printing machine of the present invention will be further described.

[0043] In the description of this invention, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this invention, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0045] A high-precision printing machine includes a wall panel 9, on which a first roller 41 and a second roller are connected. The first roller 41 is connected to a first roller bolster 11, and the second roller is connected to a second roller bolster 12. The second roller bolster 12 has the same structure as the first roller bolster 11. The machine also includes a temperature control device and a protective cover 2. The temperature control device includes an oil tank 8, an oil pump 7, and a nozzle. The nozzle is connected to the oil tank 8 through the oil pump 7. A heating rod 81 and a first temperature sensor 61 for measuring the temperature of the oil are installed inside the oil tank 8. The protective cover 2 covers the outside of the first roller bolster 11 and the second roller bolster 12. A second temperature sensor 62 for measuring the temperature of the first roller bolster 11 and the second roller bolster 12 is installed inside the protective cover 2. The nozzle extends into the protective cover 2, and the bottom of the protective cover 2 is connected to the oil tank through a pipe.

[0046] To facilitate temperature control, the first roller 11 and the second roller 12 used in this embodiment have the same structure, material, and dimensions.

[0047] Its operation method is as follows:

[0048] S1: Obtain the current normal operating temperature t1 of the first roller 11 and the second roller 12;

[0049] Normal operating temperature refers to the stable operating temperature of the first roller 11 and the second roller 12 when the pressure between them reaches the set value and the equipment maintains this temperature during normal printing. This temperature varies depending on the material, rotation speed, and contact pressure of different equipment, but for the same equipment, its operating parameters are basically fixed, meaning that t1 for this equipment is basically a fixed value. For existing equipment, the temperature of the first roller 11 and the second roller 12 during normal operation can be measured by the second temperature sensor 62 and used as the normal operating temperature t1. To more accurately control the pressure between the first roller 11 and the second roller 12, the temperature of the first roller 11 and the second roller 12 before the last printing was stopped can usually be used as the normal operating temperature t1.

[0050] S2: Before printing is initiated, i.e., in the printing-off state, the oil in the oil tank is heated to temperature t1 by heating rod 81, causing the first roller 41 and the second roller to rotate. Oil pump 7 is activated, causing oil to be sprayed through nozzles onto the first roller 11 and the second roller 12. The temperature of the first roller 11 and the second roller 12 is measured by the second temperature sensor 62 until the temperature of the first roller 11 and the second roller 12 reaches t1. In one embodiment, there are two second temperature sensors 62, which respectively measure the temperature of the first roller 11 and the second roller 12. The first nozzle 31 and the second nozzle 32 are respectively oriented towards the circumferential surfaces of the first roller 11 and the second roller 12. Preferably, the second temperature sensor 62 measures the temperature of the first roller 11 and the second roller 12 near their respective centers. Figure 3 At points M1 and M2, it is preferable to use the temperature of the parts not in contact with the oil, so as to ensure that the first roller 11 and the second roller 12 are heated evenly and to avoid misjudgment by the second temperature sensor 62. When both second temperature sensors 62 reach t1, proceed to the next step.

[0051] S3: The first roller 11 and the second roller 12 are in contact with each other, and printing is enabled. The pressure between the first roller 11 and the second roller 12 is obtained by means of a strain sensor, and the pressure between the first roller 11 and the second roller 12 is adjusted by means of a servo driver. The specific cooperation and method between the strain sensor and the servo driver can be described in the prior art CN113002130A.

[0052] After normal operation, the heating rod 81 in the oil tank can reduce the heating temperature or stop heating, so that the first roller 41 and the second roller measured by the first sensor are kept at t1, and the oil pump 7 continues to work, so that the first nozzle 31 and the second nozzle 32 continuously spray oil.

[0053] In this embodiment, when printing is not in use, the first roller 11 and the second roller 12 are heated to their normal operating temperature by heated oil, causing the rollers to expand in advance. Then, the first roller 11 and the second roller 12 are brought into contact and pressure is applied to initiate the printing process. Since the first roller 11 and the second roller 12 have already reached their normal operating temperature and expansion, the pressure between the first roller 11 and the second roller 12 only needs to be determined by a strain sensor, and the pressure between the first roller 11 and the second roller 12 can be adjusted by a servo driver. The pressure adjustment can be completed in one step. Before the end of this printing task, the servo driver does not need to be adjusted again, thus avoiding pressure instability between the first roller 11 and the second roller 12, and further avoiding damage or abnormal wear caused by sudden pressure increases.

[0054] like Figure 2 and 3 As shown, the protective cover 2 in this embodiment is shaped like an "8", that is, it has two openings for the journals 53 and shaft heads 54 on the sides of the first roller 41 and the second roller to pass through and rotate.

[0055] In this embodiment, the oil can also form an oil film at the contact surface of the first roller 11 and the second roller 12, which can reduce wear and extend service life during high-pressure rotation.

[0056] In this embodiment, the preferred nozzle includes a first nozzle 31 for spraying the first roller 11 and a second nozzle 32 for spraying the second roller 12. The first nozzle 31 faces the bottom of the first roller 11, and the second nozzle 32 is located at the bottom of the second roller 12. The spraying direction of the first nozzle 31 is opposite to the rotation direction of the first roller 11, and the spraying direction of the second nozzle 32 is opposite to the rotation direction of the second roller 12.

[0057] like Figure 3 From the perspective shown, the first roller 11 rotates counterclockwise, and the corresponding first nozzle 31 sprays oil from right to left onto the surface of the first roller 11. The second roller 12 rotates clockwise, and the corresponding second nozzle 32 sprays oil from left to right onto the surface of the second roller 12.

[0058] The action of the first nozzle 31 and the second nozzle 32 can increase the relative speed between the oil and the first roller 11 and the second roller 12, quickly remove impurities or contaminants from the surface of the first roller 11 and the second roller 12, so as to keep the surface of the first roller 11 and the second roller 12 clean and extend their service life.

[0059] like Figure 2 , 4As shown in Figure 5, in this preferred embodiment, one axial side of the first roller 11 and the second roller 12 is surface C1, and the other side is surface C2. Two first nozzles 31 are provided, one of which is inclined towards surface C1, and the other is inclined towards surface C2. The two first nozzles 31 are staggered from each other in the vertical direction. Two second nozzles 32 are provided, one of which is inclined towards surface C1, and the other is inclined towards surface C2. The two second nozzles 32 are staggered from each other in the vertical direction. A filter element is provided between the oil tank and the oil pump 7.

[0060] like Figure 5 As shown, this is the first roller 11, with surface C1 on the left and surface C2 on the right. Through two staggered first nozzles 31, oil can be sprayed onto... Figure 5 The two dashed box areas are used to spray the oil onto the circumferential surface of the first roller 11 and then it leaves in a horizontally inclined downward direction, which more effectively removes surface impurities and forms an oil film.

[0061] like Figure 4-6 As shown, preferably, the first roller bolster 11 has a U-shaped anti-splash groove 111 on both the C1 and C2 surfaces, with the opening of the anti-splash groove 111 facing the outer circumferential surface of the first roller bolster 11; the inner side of the protective cover 2 has a U-shaped oil receiving groove 231, the outer diameter of the oil receiving groove 231 is smaller than that of the anti-splash groove 111, the opening of the oil receiving groove 231 faces the anti-splash groove 111, and the projection of the oil receiving groove 231 and the anti-splash groove 111 on the axis overlaps.

[0062] The second roller 12 has the same anti-splash groove 111, and the corresponding position of the protective cover 2 has the same oil receiving groove 231.

[0063] In this embodiment, the anti-splash groove 111 is as close as possible to the outer circumferential surface of the first roller 11, and there is a certain gap between the oil receiving groove 231 and the anti-splash groove 111, so that the first roller 11 and the second roller 12 can move relative to each other in the radial direction to realize the switching between printing stop and printing start states.

[0064] During operation, the nozzle sprays oil, which impacts the inner side of the protective cover 2 after passing the surface of the first roller 11 and bounces back to be received by the anti-splash groove 111. The oil in the anti-splash groove 111 flows downward along the anti-splash groove 111 to the anti-splash groove 111 on the second roller 12, and then flows downward through the anti-splash groove 111 of the second roller 12, leaving the protective cover 2 and flowing back into the oil tank. Some oil remains on the inner side of the protective cover 2 and flows downward to be received by the oil receiving tank 231, and then continues to flow downward into the oil tank, so that the oil is completely collected and avoids overflowing outside the protective cover 2. At the same time, the protective cover 2 provides the first roller 11 and the second roller 12 with a relatively fixed working environment, such as temperature and cleanliness.

[0065] In this embodiment, the splash guard 111 can be detachably connected to the first roller 11 and the second roller 12, that is, the splash guard 111 can be a component installed later.

[0066] like Figure 4 , 7 As shown in Figure 8, a splash guard 232 is provided on the lower side of the splash guard 111 corresponding to the protective cover 2. The splash guard 232 is in the shape of a downward arc, and there is a gap between the splash guard 232 and the splash guard 111 in the vertical direction. The projection of the splash guard 232 and the splash guard 111 on the axis overlaps.

[0067] At the nozzle, the oil velocity is relatively fast. By setting the anti-splash plate 232, the oil can be effectively prevented from crossing the anti-splash groove 111 and reaching the oil receiving groove 231, thus greatly reducing the amount of oil in the oil receiving groove 231.

[0068] like Figure 9 and 10 As shown, the first roller 11 is annular, and a limiting step 51 is provided on the side of the first roller 41. A positioning shaft 52 is provided on the side of the limiting step 51. The first roller 11 is sleeved on the positioning shaft 52, and one side of the first roller 11 abuts against the side of the limiting step 51. The first roller 11 and the limiting step 51 are fixed by fasteners.

[0069] The limiting step 51 leaves a certain gap between the first roller 11 and the first roller 41. After the first roller 11 is worn, it can be removed and replaced by removing the fasteners. The new first roller 11 is fitted on the positioning shaft 52 and then fixed with fasteners. The corresponding second roller 12 is replaced in the same way.

[0070] The materials of the new first roller 11 and second roller 12 may change from the original rollers. In this case, the normal operating temperature t1 should be reconfirmed. When confirming the use for the first time, the temperature value can be obtained by using the method described in CN113002130A in the prior art.

[0071] like Figure 2 and 3 As shown, in this preferred embodiment, the protective cover 2 is divided into a first part 21 and a second part 22 with the axial connection surface of the first roller 11 and the second roller 12 as the cross surface, and the first part 21 and the second part 22 are detachably connected.

[0072] by Figure 3 Taking the perspective shown as an example, the left side of the top-to-bottom cut is the first part 21, and the right side is the second part 22.

[0073] Specifically, both the first part 21 and the second part 22 are provided with connecting ears 25, which are connected by fasteners.

[0074] A sealing ring is provided at the connection between the first part 21 and the second part 22 so that the contact surfaces remain sealed when the two parts are assembled and fixed.

[0075] like Figure 13 As shown, in this preferred embodiment, the wall panel 9 is provided with a fixing ear 91, and a mounting groove 251 is provided between the connecting ears 25 facing the side of the wall panel 9 for the fixing ear 91 to extend into.

[0076] When the first part 21 and the second part 22 are combined to cover the first roller 11 and the second roller 12 inside, the protective cover 2 is fixed to the wall panel 9 by the connecting ear 25 and the fixing ear 91, so that the protective cover 2 can be fixed relative to the position of the first roller 11 and the second roller 12.

[0077] like Figure 2 , 6 As shown in Figure 7, the protective cover 2 is divided into a third part 23 and a fourth part 24 with the axial midpoint of the first roller 11 as the cross-section. Figure 6 Taking a perspective example, the top-to-bottom cross-section shows the third part 23 on the left and the fourth part 24 on the right. Several opening and closing mechanisms 26 are provided between the third part 23 and the fourth part 24. Each opening and closing mechanism 26 includes a threaded sleeve 252, a screw 262, and a compression spring 263. The threaded sleeve 252 and the screw 262 are respectively connected to the third part 23 and the fourth part 24. The threaded sleeve 252 has two threads with a blank section between them. The end of the screw 262 has a thread. The two ends of the compression spring 263 abut against the third part 23 and the fourth part 24.

[0078] By rotating the threaded sleeve 252 or the screw 262, the screw 262 can be engaged with one of the two threads in the threaded sleeve 252. Specifically, as shown below... Figure 11 As shown, in the closed state of the opening and closing mechanism 26, when the screw 262 engages with the thread P1 deep within the threaded sleeve 252, the third part 23 and the fourth part 24 are close to each other, and the compression spring 263 is compressed. When the screw 262 is loosened, disengaging from the thread P1 deep within the threaded sleeve 252, the third part 23 and the fourth part 24 are immediately pushed apart by the compression spring 263. The end Q of the screw 262 retracts along the blank section to the thread P2 at the end of the threaded sleeve 252, but the two are not completely separated, and the opening and closing mechanism 26 is in the open state. Figure 12In the state shown, when it is necessary to bring the third part 23 and the fourth part 24 close together for locking, simply squeeze the third part 23 and the fourth part 24 to make the screw 262 engage with the thread P1 deep in the threaded sleeve 252 again.

[0079] When disassembling and assembling the protective cover 2, first open the opening and closing mechanism 26 to separate the third part 23 and the fourth part 24. The purpose is to offset the splash groove 111 and the oil receiving groove 231 axially. Then open all the connecting ears 25 to completely separate the first part 21 and the second part 22. At this time, the first part 21 and the second part 22 can be removed or installed respectively, while avoiding contact with the first roller 11 or the second roller 12.

[0080] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A high-precision printing machine, comprising a wall panel, on which a first roller and a second roller are connected, the first roller being connected to a first bolster, and the second roller being connected to a second bolster, the second bolster having the same structure as the first bolster, characterized in that: It also includes a temperature control device and a protective cover. The temperature control device includes an oil tank, an oil pump and a nozzle. The nozzle is connected to the oil tank through the oil pump. A heating rod and a first temperature sensor for measuring the oil temperature are installed in the oil tank. The protective cover covers the outside of the first roller and the second roller. A second temperature sensor for measuring the temperature of the first roller and the second roller is installed inside the protective cover. The nozzle extends into the protective cover. The bottom of the protective cover is connected to the oil tank through a pipe. The operation method of the high-precision printing machine is as follows. S1: Obtain the normal operating temperature t1 of the first roller and the second roller. The normal operating temperature t1 refers to the pressure between the first roller and the second roller reaching the set value, while the equipment maintains a stable operating temperature of the first roller and the second roller during printing. S2: Before printing is started, i.e. when printing is stopped, the oil in the oil tank is heated to the normal operating temperature t1 by heating rods, so that the first roller and the second roller rotate, the oil pump is started, so that the oil is sprayed onto the first roller and the second roller through the nozzle, and the temperature of the first roller and the second roller is measured by the second temperature sensor until the temperature of the first roller and the second roller reaches the normal operating temperature t1. S3: The first roller and the second roller come into contact with each other, printing is enabled, the pressure between the first roller and the second roller is obtained by means of a strain sensor, and the pressure between the first roller and the second roller is adjusted by means of a servo driver. The nozzle includes a first nozzle for spraying a first roller and a second nozzle for spraying a second roller. The first nozzle and the second nozzle are respectively oriented toward the circumferential surfaces of the first roller and the second roller. The first nozzle is oriented toward the bottom position of the first roller, and the second nozzle is located at the bottom position of the second roller. The spraying direction of the first nozzle is opposite to the rotation direction of the first roller, and the spraying direction of the second nozzle is opposite to the rotation direction of the second roller. The first and second rollers have a C1 surface on one side and a C2 surface on the other side along their axial direction. There are two first nozzles, one of which is inclined towards the C1 surface and the other is inclined towards the C2 surface. The two first nozzles are staggered from each other in the vertical direction. There are also two second nozzles, one of which is inclined towards the C1 surface and the other is inclined towards the C2 surface. The two second nozzles are staggered from each other in the vertical direction. A filter element is provided between the oil tank and the oil pump. The first roller ram has U-shaped anti-splash grooves on both its C1 and C2 surfaces, with the openings of the anti-splash grooves facing the outer circumference of the first roller ram; the inner side of the protective cover has a U-shaped oil receiving groove, the outer diameter of which is smaller than the outer diameter of the anti-splash groove, the opening of which faces the anti-splash groove, and the projections of the oil receiving groove and the anti-splash groove on the axis overlap. A splash guard is provided on the lower side of the protective cover corresponding to the splash guard groove. The splash guard is in the shape of a downward arc and there is a gap between the splash guard and the splash guard groove in the vertical direction. The projection of the splash guard and the splash guard groove on the axis overlaps.

2. The high-precision printing machine according to claim 1, characterized in that: The first roller is annular, and a limiting step is provided on the side of the first roller. A positioning shaft is provided on the side of the limiting step. The first roller is sleeved on the positioning shaft, and one side of the first roller abuts against the side of the limiting step. The first roller and the limiting step are fixed by fasteners.

3. The high-precision printing machine according to claim 2, characterized in that: The protective cover is divided into a first part and a second part with the axial connection surface of the first roller and the second roller as the cross surface, and the first part and the second part are detachably connected.

4. The high-precision printing machine according to claim 3, characterized in that: Both the first and second parts are provided with connecting ears, which are connected by fasteners.

5. The high-precision printing machine according to claim 4, characterized in that: The wall panel is provided with fixing ears, and there are mounting grooves between the connecting ears facing the side of the wall panel for the fixing ears to extend into.

6. The high-precision printing machine according to claim 5, characterized in that: The protective cover is divided into a third part and a fourth part with the axial midpoint of the first roller as the cross-section. Several opening and closing mechanisms are provided between the third part and the fourth part. The opening and closing mechanism includes a threaded sleeve, a screw, and a compression spring. The threaded sleeve and the screw are respectively connected to the third part and the fourth part. The threaded sleeve has two threads with a blank section between them. The end of the screw has a thread. The two ends of the compression spring abut against the third part and the fourth part.

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