Improved scraper device

Abstract

An improved scraper device relates to the technical field of printing machines with anilox rollers. The scraper quick-changing mechanism comprises a scraper beam, a pressing plate and a scraper, the bolt assembly comprises a main bolt, a spring and a screw, the spring is sleeved on the main bolt, and a through hole in the scraper beam is a two-stage stepped hole; the spring is in a pressed state due to the fact that the two ends of the spring are restrained between the shoulder faces of the two-stage stepped holes and the gasket, and the gasket is located outside the through hole and has a driving guarantee distance with the back face of the scraper beam; the head of the main bolt is a torque receiving part, and the bolt assembly can integrally rotate around the center line of the main bolt relative to the through hole. The device has the advantage that when the spring cannot work normally due to ink seepage and caking, the bolt assembly can be conveniently rotated to smash the ink block.

Description

Technical Field

[0001] The utility model relates to the technical field of printing machines with anilox rollers, in particular to a scraper device for inking the anilox rollers. Background Art

[0002] Utility model patent publication number CN212555506U discloses a scraper device, also known as a quick-change scraper blade device. The scraper device primarily consists of a control mechanism and a quick-change scraper mechanism. The control mechanism is used to control the distance between the quick-change scraper mechanism and the anilox roller to adjust the contact pressure between the scraper and the anilox roller. The control mechanism includes a rotating shaft, the axis of which is longitudinally aligned with the scraper device. This allows the entire scraper device to rotate relative to the anilox roller by an angle, allowing the scraper device to rotate about the rotating shaft to a position away from the anilox roller that facilitates maintenance and quick replacement. Figure 9 , Figure 9 It is a cross-sectional view of its scraper quick-change mechanism 10, cut at the position passing through the center line of a bolt assembly 2. The scraper quick-change device 10 has a scraper beam 1, and a through hole is provided on the scraper beam 1 for the bolt assembly 2 with a spring 22 to pass through. The through hole is a two-step hole with a shoulder. Most of the spring 22 is axially located in the large-diameter hole 112 of the through hole. Since the scraper 4 is relatively long in the length direction, the pressure plate 3 cannot achieve an absolute seal between the scraper 4 and the scraper beam 1. After long-term use, the ink in the ink chamber 8 will penetrate into the optical through hole along the contact surface between the scraper 4 and the scraper beam 1, the contact surface between the pressure plate 3 and the scraper beam 1, and the bolt assembly 2. Finally, it reaches the large diameter hole 112, dries up and forms a mass in the through hole. Over time, the large diameter hole 112 where the spring 22 is located will be filled with ink blocks. The spring will be blocked by the ink blocks and cannot be compressed in its own axial direction, resulting in the airbag 5 being inflated and pressed against the top plate 231. The bolt assembly 2 cannot move as designed to release the scraper 4. In this state, although the scraper 4 can be released by unscrewing the nut at the left end of the bolt assembly, the ink blocks in the through hole cannot be cleaned. It will be very troublesome to clean these ink blocks. The entire scraper device needs to be removed from the printing press, and then the control device and the scraper quick-change device 10 need to be disassembled. Finally, each bolt assembly 2 needs to be completely removed one by one for cleaning.

[0003] On the other hand, since the top plate 231 is Figure 9 The cross section shown is triangular and is connected to the bolt assembly 2 as a whole, which limits the rotation of the bolt assembly 2 around its own center line. The prior art with announcement number CN208730563U and name of a scraper blade quick change device also has the same problem as mentioned above, that is, its bolt assembly 2 cannot rotate around its own center line because the cross section of the top plate is trapezoidal.

[0004] In addition, in order to enable the bolt assembly 12 to move smoothly axially in the through hole, the bolt assembly 2 of the prior art CN212555506U and CN208730563U and the small-diameter hole of the through hole are fitted with a larger gap, and no anti-seepage structure is adopted at the end of the through hole near the ink cavity 8 to prevent it. This allows the ink to enter relatively smoothly from the small-diameter end of the through hole and eventually form an ink block. Summary of the Invention

[0005] The purpose of the utility model is to provide a scraper device with an improved structure in order to overcome the above-mentioned deficiencies in the prior art.

[0006] To achieve the above-mentioned purpose, the utility model provides an improved scraper device including a scraper quick-change mechanism, the scraper quick-change mechanism including a scraper beam, a pressure plate and a plurality of bolt assemblies for clamping and fixing the scraper between the scraper beam and the pressure plate, the bolt assembly including a main bolt, a spring and a screw, the screw being connected to the tail end of the main bolt by a thread, and the head of the main bolt abutting against the pressure plate, the spring being sleeved on the main bolt, the two ends of the bolt assembly being located outside the through hole on the scraper beam, the through hole being a two-step hole formed by connecting a small diameter hole and a large diameter hole; the bolt assembly also includes a washer, the washer being arranged between one end of the spring and the head of the screw, the spring being in a compressed state because its two ends are constrained between the shoulder surfaces of the two-step holes and the washer, the washer being located outside the through hole and having a driving guarantee distance between it and the back side of the scraper beam; the head of the main bolt being a torque receiving part, when the torque receiving part is subjected to a driving torque rotating around the center line of the main bolt, the bolt assembly as a whole rotates around the center line of the main bolt relative to the through hole.

[0007] As can be seen from the above scheme, the present invention addresses the problem of ink clumps solidifying the spring in the prior art, preventing the bolt assembly from moving to quickly repair or replace the scraper. The present invention improves the existing technology by replacing the top plate with a washer. Second, the head of the main bolt is designed as a torque receiving portion that can be rotated by a tool. Third, when the torque receiving portion is subjected to a driving torque, the entire bolt assembly can rotate as a whole within the through-hole. The advantages of the above improvements are that when the bolt assembly rotates, the spring will drive the ink clumps in the through-hole like a screw and shatter them, thereby releasing the solidification of the spring.

[0008] A further solution is to provide the main bolt's screw rod with a grease reservoir section, the diameter of which is smaller than that of the screw rod, and sealing rings at both ends of the grease reservoir section. The grease reservoir section, the sealing rings at both ends, and the inner wall of the through hole opposite the grease reservoir section form an annular grease reservoir chamber, which is filled with grease. The advantages of this solution are that, by adding a grease reservoir, a structural improvement, on the one hand, it lubricates the bolt assembly during the scraper release process, making the release process faster and smoother. On the other hand, and more importantly, the grease reservoir chamber can effectively isolate the path of ink from penetrating the ink chamber to the spring, aiming to fundamentally solve the problem of ink agglomeration near the spring.

[0009] A further solution is to provide a through-hole cover section between the torque receiving portion and the screw, wherein the diameter of the through-hole cover section is larger than the diameter of the small-diameter hole. This solution has the advantage of reducing the amount of ink entering through the through-hole inlet, thereby extending the service life of the grease in the grease reservoir.

[0010] A further solution is to provide a frustum section between the through-hole cover and the screw. The diameter of the larger end of the frustum section is larger than that of the smaller-diameter hole, while the diameter of the smaller end is equal to the diameter of the screw. The outlet of the through-hole on the scraper mounting side is a trumpet-shaped expansion section that matches the taper of the frustum section. This solution has the advantage of further reducing the amount of ink entering the through-hole entrance.

[0011] A further solution is that the torque receiving portion is a round bolt head, a hexagon socket bolt head, or a hexagon socket bolt head.

[0012] Another further solution is that the other end of the spring is fixed to the surface in contact with the washer. The advantage of this solution is that it can solve the problem that the ink block is too hard and causes the spring to slip relatively when the bolt assembly rotates, that is, not to rotate with it.

[0013] A further solution is that the scraper quick-change mechanism further includes a driving member, and the driving portion of the driving member is directly opposite to the screw and the washer.

[0014] A further solution is that the driving member is an airbag, and each airbag drives more than two sets of bolt assemblies. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional diagram of an embodiment of the scraper device of the utility model;

[0016] Figure 2 is a cross-sectional view of the first embodiment perpendicular to the length direction of the scraper device, and the section is located at Figure 1 The axis of the first bolt assembly on the right side;

[0017] Figure 3 yes Figure 2 A partial enlarged view of;

[0018] Figure 4 is an exploded view of the bolt assembly in the first embodiment;

[0019] Figure 5 yes Figure 4 Left view of the middle main bolt;

[0020] Figure 6 is a cross-sectional view of the second embodiment perpendicular to the length direction of the scraper device, and the section is located at Figure 1 The axis of the first bolt assembly on the right side;

[0021] Figure 7 yes Figure 6 B is a partial enlarged view;

[0022] Figure 8 is an exploded view of the bolt assembly in the second embodiment;

[0023] Figure 9 The present invention is a cross-sectional view of an existing scraper quick-change mechanism.

[0024] Among them: scraper beam 1; through hole 11; small diameter hole 111; large diameter hole 112; trumpet-shaped expansion section 113; fat storage chamber 12; bolt assembly 2; main bolt 21; torque receiving part 211; through hole cover section 212; main screw section 213; fat storage section 214; sealing ring fixing groove 215; spring 22; washer 23; top plate 231; screw 24; sealing ring 25; pressure plate 3; scraper 4; driving part 5; driving guarantee distance 51; protective cover 6; anilox roller 7; ink chamber 8; scraper quick change mechanism 10; control mechanism 20; main beam 201; rotating shaft 202; scraper device 100.

[0025] The present invention will be described in detail below in conjunction with the embodiments of the present invention and the accompanying drawings. DETAILED DESCRIPTION

[0026] See also Figure 1The scraper device 100 provided by the present invention is basically the same as the prior art, that is, it is also mainly composed of a scraper quick-change mechanism 10 and a control mechanism 20, and the two are connected by a connecting member. After the scraper device 100 is fixed to the printing press, the control mechanism 20 can be driven by a hydraulic device to make the scraper quick-change mechanism 10 move parallel to the anilox roller through the connecting member, so as to control the contact pressure between the scraper 4 and the anilox roller. The connecting member also serves to rotate the scraper device 100 as a whole around the rotating shaft 202 of the control mechanism 20, so that the scraper 4 is in a position that is convenient for disassembly, maintenance or replacement. The elongated scraper 4 is clamped on the mounting surface of the scraper beam 1 by the elongated pressure plate 3, and is clamped and fixed by multiple sets of bolt assemblies 2 arranged along the length direction. The specific functions, structural forms, etc. of the above-mentioned structure can be fully understood and implemented with reference to the aforementioned prior art patent documents, design manuals, and common sense that those skilled in the art should know. The following only describes in detail the improvements of the present invention over the solutions mentioned in the aforementioned prior art patent documents, and clarifies and explains the incomplete descriptions in the aforementioned prior art solutions.

[0027] The present invention mainly improves the structure of the bolt assembly 2 and its associated individual components. Two specific embodiments are provided below to illustrate the improved parts with reference to the drawings, while other implementation methods are only described in text.

[0028] First embodiment

[0029] See also Figure 2 and Figure 3 , Figure 3 yes Figure 2 A partial enlarged view of FIG, for the convenience of explaining the advantages of the utility model, Figure 2 The anilox roller 7 which is not part of the present invention is indicated by a dot-dash line. The improved scraper device 100 comprises a scraper quick-change mechanism 10 and a control mechanism 20 via a connecting mechanism. The control mechanism 20 comprises a long main beam 201. Rotating shafts 202 are provided at both ends of the main beam 201 in the longitudinal direction. Figure 2The state shown is the state of the scraper device 100 relative to the anilox roller 7 during normal operation. In this state, the scraper 4, the anilox roller 7, and the scraper beam 1 form a cross-section of the ink chamber 8. The scraper quick-change mechanism 10 includes a scraper beam 1, a pressure plate 3, and multiple sets of bolt assemblies 2 that clamp and fix the scraper 4 between the scraper beam 1 and the pressure plate 3. Each set of bolt assemblies 2 includes a main bolt 21, a spring 22, a washer 23, and a screw 24. The screw 24 is threadedly connected to the tail end of the main bolt 21, and the head of the main bolt 21 abuts against the pressure plate 3. The spring 22 is sleeved on the main bolt 21, and the washer 23 is disposed between one end of the spring 22 and the head of the screw 24. The two ends of the bolt assembly 2 are located outside the through hole 11 in the scraper beam 1. The through hole 11 is connected by a small diameter hole 111 and a large diameter hole 112, forming a two-step hole. The spring 22 is constrained at both ends between the shoulder surface of the two-step hole and the washer 23 and is in a compressive state with restoring force. The washer 23 is located outside the through hole 11 and has a driving guarantee distance 51 with the back side of the scraper beam 1, that is, the side opposite to the scraper. The so-called driving guarantee distance refers to the minimum distance between the washer 23 and the back side of the scraper beam 1 due to the angle between the main plane of the washer 23 and the back side. The driving guarantee distance 51 should meet the requirement that the airbag, which is the driving member 5 in this example, is Figure 3 In the uninflated state shown, when the airbag is inflated, the bolt assembly 2 is driven relative to the through hole 11. Figure 3 When the scraper 4 is easily removed by releasing its grip on the left side as shown, the washer 23 is not constrained by the back of the scraper beam 1. This means that the drive protection distance 51 should be greater than or equal to zero. Obviously, those skilled in the art can select an appropriate value based on process accuracy requirements without excessively increasing the value. An airbag can simultaneously face the screws 24 and washers 23 of two or more bolt assemblies 2, so that the airbag presses against the screw heads and washers 23 when inflated. Obviously, when the drive member 5 is a pneumatic or oil cylinder, its drive head can act like an airbag, simultaneously driving two or more bolt assemblies 2. A shield 6 is also installed on the side of the scraper beam 1 where the drive member 5 is located to ensure the cleanliness of the structure on that side.

[0030] See also Figure 4 and Figure 5 The present invention improves the structure of the main bolt 21. The head of the main bolt is designed as a torque receiving portion 211. Specifically, in this example, it has Figure 5The waist-shaped bolt head shown is used to drive the bolt assembly 2 as a whole to rotate around the center line of the main bolt 21 itself relative to the through hole 11. This can be achieved with a wrench or other tools. Obviously, the torque receiving portion can also be designed as a hexagonal bolt head or an outer hexagonal bolt head structure so that the corresponding tool can be used to drive the rotation. The main improvement of the main bolt 21 is that a fat storage segment 214 is provided on the screw segment 213 of the prior art. The diameter of the fat storage segment 214 is smaller than the diameter of the screw segment 213. Sealing rings 25 are provided at both ends of the fat storage segment 214. The sealing rings are sleeved in the sealing ring fixing grooves 215 at both ends of the fat storage segment 214 to prevent the bolt assembly 2 from axial dislocation when moving in the through hole 11. See Figure 3 The circumferential surface of the grease storage section 214, the sealing ring 25 and the inner wall of the through hole 11 opposite to the grease storage section form a space annular grease storage cavity 12. When assembling, first insert the sealing ring 25 into the sealing ring fixing groove 215, then apply grease to the area between the two sealing rings 25, and finally tighten the main bolt 21 from the Figure 3 The left side is inserted into the through hole 11, so that the grease storage chamber 12 is filled with grease. In addition, a through hole cover section 212 is provided between the torque receiving portion 211 of the main bolt 21 and the screw rod 213. The diameter of the through hole cover section 212 is larger than the diameter of the small diameter hole 111. Figure 3 When the scraper 4 is clamped, the through-hole cover section 212 will basically block the small-diameter hole 111. The gap between the two is much smaller than that in the prior art, which can relatively reduce the amount of ink entering the through-hole 11 from the open end of the small-diameter hole 111. Based on this design purpose, those skilled in the art can determine the specific value of the diameter of the through-hole cover section 212 being larger than the diameter of the small-diameter hole 111. In this example, the right end of the spring 22 and the contact surface of the washer 23 are fixedly connected. The specific connection method can be intermittent welding or continuous welding for a week, or adhesive bonding such as epoxy resin can be used. Obviously, in Figure 3 In the state shown, when the contact surface makes the friction between the two large enough, large enough that when the bolt assembly 2 is driven to rotate and can ensure the synchronous rotation of the spring 22, the above-mentioned fixed connection method is not necessary, and a non-fixed connection can also allow the rotating spring to crush the ink block.

[0031] Second embodiment

[0032] In the drawings of the second embodiment, the same reference numerals as those of the first embodiment represent the same parts or structures, and only the differences between this embodiment and the first embodiment are described in detail below.

[0033] See also Figure 6 、 Figure 7 and Figure 8 , Figure 7 yes Figure 6In the enlarged partial view B of FIG. 2 , the structure of the main bolt 21 is slightly different in the second embodiment. Specifically, a frustum section 216 is provided between the through-hole cover section 212 and the screw rod 213. The diameter of the frustum section 216 at its larger end is larger than the diameter of the small-diameter hole 111, while the diameter of the small-diameter hole 111 is equal to the diameter of the screw rod 213. The through-hole 11 in the scraper beam 1 is also slightly modified in structure. The outlet of the through-hole 11 on the scraper 4 mounting side, i.e., the outlet of the small-diameter hole 111, is designed as a trumpet-shaped flared section 113 that matches the taper of the frustum section 216. This structural difference in this embodiment has the advantages of reducing the gap between the main bolt 21 and the through-hole 11 and enhancing the stability of the bolt assembly 2 during operation from the scraper 4 release state to the clamped state within the through-hole 11. Specifically, during operation, the trumpet-shaped flared section 113 guides the frustum section 216, ensuring that the centerline of the main bolt 21 remains collinear with the centerline of the through-hole during operation.

[0034] The following combination Figure 2 and Figure 3 The present invention explains the method for dealing with the problem of spring being solidified by ink. The method further demonstrates the advantages of the improved scraper device. After the scraper device 100 has been in operation for a long time, the ink in the ink chamber 8 repeatedly seeps into the through hole 11, dries up, and then seeps and dries up again during operation. Eventually, when the scraper 4 needs to be replaced or repaired, it is found that no matter how the airbag as the driving member 5 is inflated at the rated air pressure, it cannot drive the bolt assembly 2 to move relative to the through hole 11. This means that the large diameter hole 112 is basically filled with ink, which has solidified the spring 22. At this time, it is only necessary to deflate the airbag and repair the improved scraper device 100. Figure 2 The state shown, that is, the state in which the scraper 4 faces the anilox roller 7, is as follows: the entire improved scraper device 100 is Figure 2 Unlock it in the state shown, and make it rotate around the axis 202 of the main beam 201 Figure 2 By rotating the screw clockwise for about 90 degrees, the scraper 4 is rotated from a state generally facing left to a state generally facing upward. The maintenance person can then use a tool to apply torque to the torque receiving portion 211 to drive the bolt assembly 2 to rotate in the through hole 11. Since the spring 22 rotates with the screw, the ink sticks in the through hole 11, especially those solidified by the spring 22, can be crushed. After all the bolt assemblies have completed the ink stick crushing operation, the improved scraper device 100 is returned to the original position and locked. Figure 2 The working position shown in FIG. 1 is shown, and the inflation and deflation operations of the airbag 5 are repeated, and can also be accompanied by a water washing operation, so that the problem can be solved quickly compared with the prior art.

Claims

1. An improved scraper device (100), comprising a scraper quick-change mechanism (10), the scraper quick-change mechanism (10) comprising a scraper beam (1), a pressure plate (3) and a plurality of bolt assemblies (2) for clamping and fixing a scraper (4) between the scraper beam (1) and the pressure plate (3), the bolt assembly (2) comprising a main bolt (21), a spring (22) and a screw (24), the screw (24) being connected to the tail end of the main bolt (21) by a thread, and the head of the main bolt (21) being in abutment with the pressure plate (3), the spring (22) being sleeved on the main bolt (21), the two ends of the bolt assembly (2) being located outside a through hole (11) on the scraper beam (1), the through hole (11) being a two-step hole formed by connecting a small diameter hole (111) and a large diameter hole (112); Its characteristics are: The bolt assembly (2) further includes a washer (23), the washer (23) being arranged between one end of the spring (22) and the head of the screw (24), the spring (22) being in a compressed state due to both ends being constrained between the shoulder surface of the two-step hole and the washer (23), the washer (23) being located outside the through hole (11) and having a driving guarantee distance (51) between it and the back surface of the scraper beam (1); The head of the main bolt (21) is a torque receiving portion (211). When the torque receiving portion (211) is subjected to a driving torque rotating around the center line of the main bolt (21), the bolt assembly (2) rotates as a whole around the center line of the main bolt (21) relative to the through hole (11).

2. The improved scraper device according to claim 1, characterized in that: The screw rod (213) of the main bolt (21) is provided with a grease storage section (214), the diameter of the grease storage section (214) is smaller than the diameter of the screw rod (213), and sealing rings (25) are provided at both ends of the grease storage section (214); The grease storage section (214), the sealing rings (25) provided at both ends, and the inner wall of the through hole (11) opposite to the grease storage section (214) form an annular grease storage cavity (12), and the grease storage cavity (12) is filled with lubricating grease.

3. The improved scraper device according to claim 2, characterized in that: A through-hole cover section (212) is further provided between the torque receiving portion (211) and the screw rod (213), and the diameter of the through-hole cover section (212) is larger than the diameter of the small-diameter hole (111).

4. The improved scraper device according to claim 3, characterized in that: A frustum section (216) is further provided between the through-hole cover section (212) and the screw rod (213), wherein the diameter of the large end of the frustum section (216) is larger than the diameter of the small-diameter hole (111), and the diameter of the small end is equal to the diameter of the screw rod (213); The outlet of the through hole (11) on the installation side of the scraper (4) is a trumpet-shaped expansion section (113) adapted to the taper of the frustum section (216).

5. The improved scraper device according to claim 4, characterized in that: The torque receiving portion (211) is a round bolt head, a hexagonal bolt head, or a hexagonal bolt head.

6. The improved scraper device according to any one of claims 1 to 5, characterized in that: The other end of the spring (22) is fixed on a surface in contact with the washer (23).

7. The improved scraper device according to claim 6, characterized in that: The scraper quick-change mechanism (10) further comprises a driving member (5), wherein a driving portion of the driving member (5) faces the screw (24) and the washer (23).

8. The improved scraper device according to claim 7, characterized in that: The driving member (5) is an air bag, and each air bag drives more than two sets of bolt assemblies (2).

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