A doctor water circulation cooling device and a gravure printing machine

Abstract

The application provides a scraper water circulation cooling device and a gravure printing machine, and relates to the technical field of printing machines.The scraper water circulation cooling device comprises a blade body and a blade head which is slidably connected to the blade body.A plurality of cooling grooves are formed on the side of the blade head away from the head portion.The cooling grooves extend to the side close to the head portion of the blade head.A cooling cavity is arranged in the blade body.The blade head is configured to be completely slid into the cooling cavity for cooling.A closing element is arranged at the outlet of the blade body.A linkage assembly is further arranged on the blade body.The linkage assembly is used to correspondingly drive the blade head to extend out of or retract into the blade body when the blade body is close to or away from the part to be scraped by the printing plate.The application can quickly reduce the temperature of the blade head by the cooperation of the cooling grooves and the cooling cavity, so as to avoid the softening, accelerated wear or deformation of the scraping edge caused by heat accumulation, thereby maintaining the ink scraping precision and printing stability.

Description

Technical Field

[0001] This invention relates to the field of printing press technology, and more specifically, to a doctor blade water circulation cooling device and a gravure printing press. Background Technology

[0002] Gravure printing is a printing device that uses a gravure cylinder as a carrier to store ink in the recessed areas and transfer it to the surface of the substrate to reproduce images. It features high printing speed, rich tonal range, and vibrant colors, and is widely used in packaging, decoration, and anti-counterfeiting printing. During the printing process, gravure printing typically requires a doctor blade to scrape away residual ink from the surface of the printing cylinder to ensure the clarity of the transferred image and the uniformity of the ink layer.

[0003] However, under conditions of high-speed operation and long-term continuous work, the continuous friction between the doctor blade and the printing cylinder not only leads to a significant local temperature rise in the doctor blade, but also easily causes a decline in the performance of the doctor blade material due to frictional heat. For example, the doctor blade edge may soften, wear may accelerate, or deformation may occur, thus affecting the ink scraping effect and printing stability. At the same time, frictional heat may also cause local viscosity changes in the ink, resulting in uneven ink transfer or printing defects such as streaks and spots, directly reducing print quality. Summary of the Invention

[0004] The purpose of this invention is to provide a doctor blade water circulation cooling device and a gravure printing machine, which can quickly reduce the temperature of the doctor blade by using the cooperation of the cooling tank and the cooling chamber, so as to avoid softening, increased wear or deformation of the doctor blade caused by heat accumulation, thereby maintaining the accuracy of doctor blade and printing stability.

[0005] Firstly, the present invention is achieved through the following technical solution: A doctor blade water circulation cooling device, applied to a gravure printing machine, includes a doctor blade body and a doctor blade head slidably inserted into the doctor blade body. Multiple cooling grooves are formed on the side of the doctor blade head away from its head, extending to the side near the head of the doctor blade head. A cooling chamber is provided inside the doctor blade body. The doctor blade head is configured to slide completely into the cooling chamber for cooling. A sealing member is provided at the outlet of the doctor blade body. The sealing member can close the outlet of the doctor blade body after the doctor blade head has fully entered the cooling chamber, and also allows the outlet of the doctor blade body to remain connected to the doctor blade head after the doctor blade head extends out of the cooling chamber. The cooling chamber is sealed and connected to a cold water source through an inlet. A cooling plate is provided on the blade body and is located on the side wall of the cooling chamber. The cooling plate extends out of the blade body and is connected to a cooling box. Cooling fins are provided on the cooling box. The cooling plate, cooling box, and cooling fins are hollow and interconnected. A first water outlet is provided on the cooling plate, and a second water outlet is provided on the cooling box. A linkage component is provided on the blade body. The linkage component is used to drive the blade head to extend or retract the blade body when the blade body approaches or moves away from the part of the printing plate being scraped.

[0006] Furthermore, an extension rod is fixedly provided on the side wall of the cooling chamber of the blade away from the blade head, corresponding to a plurality of cooling grooves, and the diameter of the extension rod is smaller than the groove diameter of the cooling groove.

[0007] Furthermore, the linkage assembly includes a first rack, a gear, a second rack, and a reset member. The first rack is fixedly mounted on the cutter head, the gear is fixedly mounted on the cutter body, and the second rack slides through the cutter body. The gear meshes with the first and second racks. The initial state of the second rack is that it extends a certain length beyond the cutter body. When the second rack abuts against the printing press frame and the cutter body is close to the part that scrapes off the printing plate, the first rack can drive the gear to rotate and cause the cutter head to extend out of the cutter body. The reset member is connected to the cutter head and the cutter body and is used to retract the cutter head into the cooling cavity of the cutter body when the second rack disengages from the printing press frame.

[0008] Furthermore, the linkage components are provided in two sets and symmetrically arranged on both sides of the blade.

[0009] Furthermore, the cutter head has multiple cooling holes along its length, and the cooling holes and the cooling groove are staggered and not connected to each other.

[0010] Furthermore, the cooling chamber of the blade is provided with a drying chamber near its outlet, with an air inlet on one side and an air outlet on the other side.

[0011] Furthermore, the sealing component includes a first rubber ring and a second rubber ring, which are respectively embedded on the upper and lower sides of the drying chamber.

[0012] Furthermore, the blade is open on the side away from its exit, and a sealing plate is detachably and closed at the opening. The extension rod is fixedly mounted on the sealing plate, and the first rack slides through the sealing plate, with a sealing rubber sleeve embedded at its insertion position.

[0013] Furthermore, the first outlet is located on the side of the cooling plate near its bottom; And / or, a mounting ear plate is fixedly provided on the blade; And / or, a roller is rotatably provided at the bottom of the second rack; And / or, a protective cover is provided on the enclosed plate, the protective cover covering the first rack, the gear and the second rack.

[0014] Secondly, the present invention is achieved through the following technical solution: A gravure printing machine includes the doctor blade water circulation cooling device described in the above-mentioned solution.

[0015] The technical solution of the present invention has at least the following advantages and beneficial effects: 1. This invention solves the problem of localized overheating caused by high-speed friction in existing gravure printing presses by incorporating a water circulation cooling system into the doctor blade structure, enabling timely cooling of the blade head during operation. Specifically, the blade head can be completely retracted into the cooling chamber within the blade body when not in use or when the temperature is too high. The cooperation between the cooling groove and the cooling chamber rapidly reduces the blade head temperature, preventing softening, accelerated wear, or deformation of the doctor blade due to heat accumulation, thereby maintaining ink scraping accuracy and printing stability.

[0016] 2. This invention further enhances the heat dissipation efficiency of water circulation through the heat dissipation pathway formed by the cooling plate, cooling box, and cooling fins, making the cooling process more sustained and stable. The sealing component not only ensures the sealing of the blade outlet during cooling but also maintains a tight fit between the blade and the blade head when the blade is extended for use, preventing coolant leakage. The linkage component enables automatic switching of the blade head between printing and cooling conditions, improving the flexibility and reliability of use. In summary, this device not only achieves efficient cooling and thermal protection of the doctor blade, extending its service life, but also maintains the uniformity of ink transfer, significantly improving the overall quality and continuous operation capability of gravure printing. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of a scraper water circulation cooling device provided by the present invention; Figure 2This invention aims to demonstrate the internal structure of the blade. Figure 1 ; Figure 3 This invention aims to demonstrate the internal structure of the blade. Figure 2 ; Figure 4 for Figure 3 Enlarged view of section A; Figure 5 This invention is intended to illustrate the structure of a cooling plate, a cooling box, and cooling fins. Figure 6 This invention aims to illustrate the state of the blade tip retracted into the blade body; Reference numerals: 100-blade, 110-cooling chamber, 111-water inlet, 112-drying chamber, 1121-air inlet, 1122-air outlet, 200-blade tip, 210-cooling groove, 220-cooling hole, 300-sealing component, 310-first rubber ring, 320-second rubber ring, 400-cooling plate, 401-first water outlet, 410-cooling box, 411-second water outlet, 420-cooling fins, 500-linkage assembly, 510-first rack, 520-gear, 530-second rack, 531-roller, 540-reset component, 600-extension rod, 700-sealing plate, 710-sealing rubber sleeve, 720-protective cover, 800-mounting ear plate. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] The following is for reference Figures 1-6As shown in the illustration, and further explained with reference to a specific embodiment, this embodiment provides a doctor blade water circulation cooling device applied to a gravure printing machine, including a blade body 100 and a doctor blade head 200 slidably inserted into the blade body 100. Multiple cooling grooves 210 are provided on the side of the doctor blade head 200 away from its head. The cooling grooves 210 ensure that the doctor blade head 200 continues to be cooled even after it extends out of the blade body 100. The cooling grooves 210 extend to the side near the head of the doctor blade head 200, causing the coolant to flow in an adherent manner near the working end of the doctor blade head 200 and increasing the heat exchange area with the high-temperature region, thereby quickly removing frictional heat without changing the scraping posture. A cooling chamber 110 is provided inside the blade body 100, and the doctor blade head 200 is configured to be able to slide completely into the cooling chamber 110 for cooling, facilitating overall immersion cooling during pauses or when the temperature rise exceeds the limit, avoiding softening or deformation of the doctor blade caused by local temperature gradients.

[0021] The blade 100 has a sealing element 300 at its outlet. This sealing element 300 seals the outlet of the blade 100 after the cutting head 200 has fully entered the cooling chamber 110, and also maintains a seal between the outlet of the blade 100 and the cutting head 200 after the cutting head 200 has extended out of the cooling chamber 110. This ensures the circulation loop remains in a controlled, sealed state under both operating conditions, preventing coolant leakage and maintaining a stable flow rate. The cooling chamber 110 is connected to a cold water source via an inlet 111. A cooling plate 400 is mounted on the blade 100, located on the side wall of the cooling chamber 110 and forming a high thermal conductivity path with the blade 100. The cooling plate 400 extends beyond the blade 100 and is connected to a cooling box 410, which has cooling fins 420. (Refer to...) Figure 4 As shown, the cooling plate 400, cooling box 410, and cooling fins 420 are hollow and interconnected, forming a channel for heat dissipation from the inside out. The cooling plate 400 is provided with a first outlet 401, and the cooling box 410 is provided with a second outlet 411. In this way, the coolant enters from the inlet 111, then enters the cooling chamber 110, then enters the first outlet 401, then enters the cooling plate 400, cooling box 410, and cooling fins 420, and finally exits from the second outlet 411 and circulates back into the cold water source to achieve circulating cooling. At the same time, since the cooling plate 400 is located inside the cooling chamber 110 and is connected to the external heat dissipation structure, it can quickly dissipate the temperature and shorten the residence time of heat in the blade 100.

[0022] The blade body 100 is provided with a linkage component 500. The linkage component 500 is used to drive the blade head 200 to extend or retract the blade body 100 when the blade body 100 is close to or away from the part of the printing plate being scraped, thereby achieving reliable switching between the printing and cooling states, reducing the risk of malfunction and improving operational stability.

[0023] Reference Figure 2 and Figure 3 As shown, an extension rod 600 is fixedly installed on the side wall of the cooling chamber 110 of the blade 100 away from the cutting head 200, corresponding to multiple cooling grooves 210. The diameter of the extension rod 600 is smaller than the groove diameter of the cooling groove 210 to form an annular flow channel during insertion. When the cutting head 200 retracts into the blade 100, the extension rod 600 inserts into the cooling groove 210. Through the combined action of volume displacement and annular flow guidance, the high-temperature coolant accumulated in the cooling groove 210 is quickly pushed back to the main flow area of ​​the cooling chamber 110, and forms a directional drainage along the direction of the first outlet 401, avoiding hot liquid retention and local reheating. The end of the extension rod 600 can be rounded or chamfered to reduce the insertion force and reduce wear on the groove wall. The fit clearance between the rod and the groove is controlled within the range that ensures flow rate and prevents jamming, so that smooth drainage and stable sealing can be maintained even during multiple extension and retraction cycles. This structure can also suppress bubble accumulation in the cooling tank 210, reduce the impact of cavitation or air resistance on flow stability, and improve overall heat exchange efficiency.

[0024] Reference Figure 1 and Figure 2 As shown, the linkage component 500 includes a first rack 510, a gear 520, a second rack 530, and a reset component 540. The first rack 510 is fixedly welded to the cutter head 200, the gear 520 is fixedly mounted on the cutter body 100, and the second rack 530 slides through the cutter body 100. The gear 520 meshes with the first rack 510 and the second rack 530. The initial state of the second rack 530 is that it extends a certain length beyond the cutter body 100. When the second rack 530 abuts against the printing press frame and the cutter body 100 is close to the part scraped off the printing plate, the first rack 510 can drive the gear 520 to rotate and drive the cutter head 200 to extend out of the cutter body 100, realizing the linkage logic of extending when close. The reset element 540 is connected to the cutter head 200 and the cutter body 100 and is located within the cooling chamber 110. In this embodiment, the reset element 540 is a spring sheet, but other elastic structures such as springs can also be used. It is used to retract the cutter head 200 into the cooling chamber 110 of the cutter body 100 when the second rack 530 disengages from the printing press frame. The aforementioned gear 520-rack transmission has the characteristics of compact structure, fixed transmission ratio, and direct response. Combined with the elastic energy storage of the reset element 540, it can avoid overshoot caused by inertia or reverse load, ensuring that the cutter head 200 extends and retracts to the correct position and reducing the impact on the closure 300.

[0025] Reference Figure 1 As shown, the linkage components 500 are provided in two sets and symmetrically arranged on both sides of the blade body 100. The dual-set symmetrical arrangement can provide balanced driving force during the extension and retraction of the blade head 200, avoiding swaying or jamming caused by unilateral driving, thereby maintaining the coaxiality and straightness of the blade head 200 relative to the blade body 100 and reducing the wear of the sliding mating surfaces.

[0026] In other embodiments, the linkage component 500 can be directly driven by a cylinder or electric cylinder, but this requires the addition of sensors, increasing the complexity of the device. In contrast, the purely mechanical linkage of gear 520-rack-reset component 540 has advantages such as resistance to contamination and ease of maintenance in high-speed, dusty, and ink-filled environments, making it more suitable for long-term continuous operation.

[0027] Furthermore, the cutter head 200 has multiple cooling holes 220 along its length. These cooling holes 220 are staggered from and do not communicate with the cooling groove 210, allowing for accelerated cooling. This staggered arrangement helps avoid creating excessive weakened areas within the same cross-section, ensuring the strength and rigidity of the cutter head 200. Simultaneously, the cooling holes 220 form multiple heat dissipation channels on the surface of the cutter head 200, increasing the heat transfer perimeter per unit length. Combined with the adsorption flow of the cooling groove 210, this achieves a composite heat transfer of "surface-line-point". The openings of the cooling holes 220 can be slightly chamfered depending on the processing method to reduce residual liquid retention, shorten drying time, and minimize the impact of residual water after cooling on the stability of subsequent scraping.

[0028] Reference Figure 2 As shown, the cooling chamber 110 of the blade 100 has a drying chamber 112 near its outlet. An air inlet 1121 is located on one side of the drying chamber 112, and an air outlet 1122 is located on the other side. This allows the water in the cooling holes 220 to be dried, preventing it from affecting the printing plate. The drying chamber 112 is positioned near the outlet, allowing the airflow to directly cover the working end of the blade 200 and the area of ​​its cooling holes 220. The air inlet 1121 and air outlet 1122 are positioned opposite each other to form a through-flow air passage, reducing vortex dead zones and improving purging efficiency, while also providing cooling. The drying chamber 112 is adjacent to the sealing member 300 along the extension path of the blade 200, facilitating rapid water removal before each extension of the blade 200, preventing water from being carried into the printing contact area and causing ink dilution or streaks.

[0029] Furthermore, the sealing component 300 includes a first rubber ring 310 and a second rubber ring 320. The first rubber ring 310 and the second rubber ring 320 are respectively embedded on the upper and lower sides of the drying chamber 112. When the cutter head 200 is retracted into the cutter body 100, the first rubber ring 310 and the second rubber ring 320 can deform to seal the drying chamber 112 and the cooling chamber 110. When the cutter head 200 is extended out of the cutter body 100, the first rubber ring 310 and the second rubber ring 320 can deform to abut against the cutter head 200 to achieve a seal. In actual assembly and manufacturing, the first rubber ring 310 and the second rubber ring 320 can be made thicker to ensure sealing performance. The dual-ring partition seal can simultaneously handle static sealing (cutter head 200 retracted) and dynamic sealing (cutter head 200 extended) conditions. Radial and axial compound compression improves the sealing redundancy. The rubber ring has a certain buffering effect on the surface of the cutter head 200, which can reduce the erosion of the coating or surface treatment layer of the cutter head 200 by the reciprocating motion and extend the service life of the cutter head 200 and the sealing component 300.

[0030] Reference country 2 and Figure 5 As shown, the blade 100 has an opening on the side away from its exit point. A sealing plate 700 is detachably and closed at the opening by bolts. An extension rod 600 is fixedly mounted on the sealing plate 700. A gear 520 is rotatably mounted on the sealing plate 700 via a bracket. A first rack 510 and a second rack 530 slide through the sealing plate 700, and a sealing rubber sleeve 710 is embedded at their insertion points to achieve a seal, thus facilitating the removal of the sealing plate 700. This structure allows key components related to wear, lubrication, and calibration (extension rod 600, gear 520, racks, and sealing sleeves) to be assembled and replaced as a whole with the sealing plate 700, facilitating maintenance and cleaning. The positioning of the sealing plate 700 uses a combination of circumferential limiting and axial fastening, which ensures that the transmission center distance and guide coaxiality remain stable after disassembly and assembly, avoiding meshing deviation or leakage risks caused by maintenance.

[0031] As an optional embodiment, the first outlet is located on the side of the cooling plate 400 near its bottom; the bottom opening facilitates the formation of a self-draining tendency under the action of gravity, reduces coolant retention and allows higher temperature liquid to flow away, improves the continuous liquid supply capacity of the cooling chamber 110 to the cooling plate 400 channel, and at the same time allows high temperature liquid to be preferentially introduced into the external heat dissipation stage, shortening the heat dissipation path.

[0032] The blade 100 is welded with a mounting ear plate 800; the mounting ear plate 800 provides a standardized fixing interface for the blade 100, which facilitates rigid connection and position fine adjustment with the printing press frame or support, ensuring the stability of the blade 100-blade head 200 assembly relative to the printing plate and reducing the blade jump caused by frame vibration transmission.

[0033] As an optional embodiment, a roller 531 is rotatably provided at the bottom of the second rack 530; the roller 531 is used to provide rolling contact during the contact between the second rack 530 and the printing press frame, reduce frictional resistance and local wear, improve the sensitivity of linkage triggering and repeatability of positioning accuracy, and at the same time reduce wear on the surface of the frame.

[0034] As an optional embodiment, a protective cover 720 is bolted to the enclosure plate 700, covering the first rack 510, gear 520, and second rack 530. The protective cover 720 can prevent ink splashes and dust from entering the transmission area, reducing the probability of foreign object jamming, and providing isolation protection for exposed moving parts to avoid accidental injury. At the same time, the protective cover 720 can adopt a viewing window or a removable structure for daily inspection and lubrication maintenance.

[0035] This invention also provides a gravure printing machine, including the doctor blade water circulation cooling device described in the above-mentioned solution. By integrating this cooling device into the doctor blade mechanism of the gravure printing machine, the doctor blade can be cooled in real time during high-speed operation, ensuring that the doctor blade maintains a suitable temperature range when scraping ink, thus preventing a decrease in doctor blade scraping performance due to overheating. The coolant forms a continuous circulation between the cooling chamber 110, cooling tank 210, cooling plate 400, and cooling box 410, which not only quickly removes frictional heat but also enhances the heat dissipation effect through the cooling fins 420, thereby ensuring the stability and continuity of cooling. Because this device achieves temperature control at the contact point between the doctor blade and the printing plate cylinder, it can effectively prevent ink viscosity changes due to localized high temperatures, ensuring uniform ink transfer and printing quality.

[0036] Meanwhile, the linkage component 500, in conjunction with the overall transmission mechanism of the printing press, enables the doctor blade to automatically switch between working and cooling states, reducing the frequency of manual adjustments and improving production efficiency. Overall, gravure printing presses employing this cooling device extend the doctor blade's lifespan while ensuring ink scraping accuracy and stability, thus enhancing the machine's continuous operation capability and printing quality.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A doctor blade water circulation cooling device, applied to a gravure printing machine, characterized in that, The device includes a blade (100) and a blade head (200) slidably inserted into the blade (100). The blade head (200) has multiple cooling grooves (210) on the side away from its head, extending to the side near the head of the blade head (200). A cooling chamber (110) is provided inside the blade (100). The blade head (200) is configured to slide completely into the cooling chamber (110) for cooling. A sealing member (300) is provided at the outlet of the blade (100). The sealing member (300) can seal the outlet of the blade (100) after the blade head (200) can fully enter the cooling chamber (110), and also allows the outlet of the blade (100) to remain sealed to the blade head (200) after the blade head (200) extends out of the cooling chamber (110). The cooling chamber (110) is connected to a cold water source. The blade (100) is connected to the water inlet (111). A cooling plate (400) is provided on the blade (100). The cooling plate (400) is located on the side wall of the cooling chamber (110). The cooling plate (400) extends out of the blade (100) and is connected to a cooling box (410). Cooling fins (420) are provided on the cooling box (410). The cooling plate (400), the cooling box (410), and the cooling fins (420) are connected. The device is hollow and interconnected. The cooling plate (400) is provided with a first water outlet (401), the cooling box (410) is provided with a second water outlet (411), and the blade (100) is provided with a linkage component (500). The linkage component (500) is used to drive the blade head (200) to extend or retract the blade (100) when the blade (100) is close to or away from the part of the printing plate being scraped.

2. The scraper water circulation cooling device according to claim 1, characterized in that, The cooling chamber (110) of the blade (100) is provided with an extension rod (600) on the side wall away from the blade head (200) corresponding to a plurality of cooling grooves (210). The diameter of the extension rod (600) is smaller than the groove diameter of the cooling groove (210).

3. The scraper water circulation cooling device according to claim 2, characterized in that, The linkage assembly (500) includes a first rack (510), a gear (520), a second rack (530), and a reset member (540). The first rack (510) is fixedly mounted on the cutter head (200), the gear (520) is fixedly mounted on the cutter body (100), and the second rack (530) slides through the cutter body (100). The gear (520) meshes with the first rack (510) and the second rack (530). The initial state of the second rack (530) is that it extends out of the cutter body (100). At a certain length, when the second rack (530) abuts against the printing press frame and the blade (100) is close to the part scraping the printing plate, the first rack (510) can drive the gear (520) to rotate and drive the blade head (200) to extend out of the blade (100). The reset member (540) is connected to the blade head (200) and the blade (100) and is used to retract the blade head (200) into the cooling chamber (110) of the blade (100) when the second rack (530) is disengaged from the printing press frame.

4. The scraper water circulation cooling device according to claim 3, characterized in that, The linkage components (500) are provided in two sets and are symmetrically arranged on both sides of the blade (100).

5. The scraper water circulation cooling device according to claim 1, characterized in that, The cutter head (200) has a plurality of cooling holes (220) along its length. The cooling holes (220) are staggered from the cooling groove (210) and are not connected to each other.

6. The scraper water circulation cooling device according to claim 5, characterized in that, The cooling chamber (110) of the blade (100) has a drying chamber (112) near its outlet. The drying chamber (112) has an air inlet (1121) on one side and an air outlet (1122) on the other side.

7. The scraper water circulation cooling device according to claim 6, characterized in that, The sealing component (300) includes a first rubber ring (310) and a second rubber ring (320), which are respectively embedded on the upper and lower sides of the drying chamber (112).

8. The scraper water circulation cooling device according to claim 3, characterized in that, The blade (100) has an opening on the side away from its outlet, and a sealing plate (700) is detachably and closed at the opening. The extension rod (600) is fixedly mounted on the sealing plate (700). The first rack (510) slides through the sealing plate (700), and a sealing rubber sleeve (710) is embedded at its insertion position.

9. The scraper water circulation cooling device according to claim 8, characterized in that, The first water outlet is located on the side of the cooling plate (400) near its bottom; And / or, a mounting ear plate (800) is fixedly provided on the blade (100); And / or, a roller (531) is rotatably provided at the bottom of the second rack (530); And / or, a protective cover (720) is provided on the enclosed plate (700), the protective cover (720) covering the first rack (510), the gear (520) and the second rack (530).

10. A gravure printing machine, characterized in that, The scraper water circulation cooling device includes any one of claims 1-9.

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