Scraper

Abstract

The utility model discloses a scraper which comprises a scraper body provided with an air flow channel, an air inlet assembly arranged on the scraper body and communicated with one end of the air flow channel, and a hole blocking assembly arranged on the scraper body and connected with the other end of the air flow channel in a sealing mode, a plurality of air injection holes are further formed in the scraper body, and one ends of the air injection holes are communicated with the air flow channel. An air outlet is formed in the other end of the air spraying hole and is formed in the side surface of the knife body. The device has the advantages that the air flow channel and the air injection holes are formed in the scraper, and compressed air is injected to the area between the compression roller and the scraper through the air injection holes when the roller surface of the compression roller is scraped away by the scraper, so that the pressure intensity of the area between the compression roller and the scraper is lower than the pressure intensity in the blind holes corresponding to the area, and water stains in the blind holes are sucked out; in the whole process, the surface of the compression roller is not impacted, the service life of the compression roller is prolonged, water spots can be rapidly sucked out of the blind holes, it is guaranteed that the roller surface is dry when paper is pressed in the follow-up process, and the paper effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of papermaking equipment, specifically a doctor blade. Background Technology

[0002] In the papermaking industry, the pulp undergoes gravity dewatering, squeeze dewatering, and drying dewatering during the paper production process to ultimately form a dry paper sheet. Squeezing is typically accomplished by pressing rollers together. To extract more water, in addition to increasing the linear pressure on the rollers, space must be provided to temporarily store the extracted water. After continuous pressing, the temporarily retained water must be fully drained. Therefore, blind holes or grooves are made on the surface of the pressure rollers to store water. When the paper sheet is pulled out from one side of the pressure roller exit, the blind holes and grooves are filled with water, which must be quickly drained. This process is repeated at the roller entrance to squeeze the water out of the paper sheet again. To ensure sufficient and rapid drainage, a doctor blade or scraper is used to promptly remove water from the roller surface. Ordinary scrapers have difficulty removing water from blind holes and grooves because they only scrape water off the surface of the pressure roller. They are used in conjunction with an air blowing device to blow air into the blind holes. However, the traditional air blowing device is installed below the scraper and blows air directly into the blind holes. This method is not only inconvenient for the installation of the scraper and air blowing device due to space limitations, but also causes damage to the surface of the pressure roller due to the direct action of high-pressure gas. The water stains blown out by the gas will still splash, resulting in poor removal effect.

[0003] Therefore, it is necessary to provide a scraper. Utility Model Content

[0004] The scraper provided by this utility model effectively solves the problems of inconvenience in removing water stains from blind holes of existing pressure rollers and poor water stain removal effect.

[0005] The technical solution adopted in this utility model is:

[0006] A scraper includes a blade body with an airflow channel, an air intake assembly disposed on the blade body and communicating with one end of the airflow channel, and a plugging assembly disposed on the blade body and sealingly connected to the other end of the airflow channel. The blade body is also provided with a plurality of air jet holes, one end of which is communicating with the airflow channel, and the other end of which is an air outlet, which is disposed on the side of the blade body.

[0007] Furthermore, several of the air jet holes are arranged laterally along the blade body, and the air jet holes are inclined downwards towards the air outlet side.

[0008] Furthermore, the spacing between adjacent jet holes is the same.

[0009] Furthermore, the airflow channel extends laterally along the blade body, so that the airflow channel passes through both ends of the blade body.

[0010] Furthermore, the blade body includes a blade and a blade body. The air jet and airflow channel are both disposed on the blade body. The blade body includes a first plate, a second plate disposed on one side of the first plate, and a third plate disposed on the other side of the first plate. The first plate, the second plate, and the third plate form a groove. The blade is disposed on the upper end of the first plate.

[0011] Furthermore, one side of the blade body is set as a concave arc surface, which is opposite to the pressure roller during use.

[0012] Furthermore, both the airflow channel and the jet hole have circular cross-sections, and the diameter of the jet hole is smaller than the diameter of the airflow channel.

[0013] Furthermore, the second plate is tilted downwards.

[0014] Furthermore, a nozzle is provided on the air jet hole.

[0015] Beneficial effects of the utility model:

[0016] 1. By setting airflow channels and jet holes on the doctor blade, compressed gas is injected into the area between the doctor blade and the pressure roller when the doctor blade scrapes away from the roller surface. This makes the pressure in the area between the pressure roller and the doctor blade lower than the pressure in the corresponding blind hole, thereby absorbing water stains from the blind hole. The whole process does not impact the surface of the pressure roller, which not only extends the service life of the pressure roller, but also quickly absorbs all water stains from the blind hole, ensuring that the roller surface is dry when the paper is pressed in the future, thus ensuring the paper quality.

[0017] 2. The entire air jet is angled downwards to ensure that the gas does not blow directly onto the roller surface after the scraper is installed.

[0018] 3. By setting a downward-sloping No. 2 plate, the sucked-out water stains can eventually flow along the No. 2 plate to the predetermined position.

[0019] 4. The airflow channel is set horizontally along the scraper, and the spacing between each jet hole is equal, which facilitates the processing of the airflow channel and also ensures that the water stain removal effect of the blind holes located at various positions of the pressure roller is the same. Attached Figure Description

[0020] Figure 1 A front view of the scraper provided for an embodiment of this application.

[0021] Figure 2 A side view of a scraper provided for an embodiment of this application.

[0022] Figure 3 This is a schematic diagram illustrating the operation of a scraper and blade provided in an embodiment of this application.

[0023] The markings in the diagram are as follows: 1. Blade body; 2. Air intake assembly; 3. Hole plugging assembly; 100. Air jet hole; 200. Airflow channel; 11. Blade; 12. Plate 1; 13. Plate 2; 14. Plate 3; 101. Arc surface; 4. Pressure roller; 6. Blade; 700. Water stain; Detailed Implementation

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 and Figure 2 As shown, the first embodiment provided in this application is a scraper. The scraper includes a blade body 1 with an airflow channel 200, an air intake component 2 disposed on the blade body 1 and communicating with one end of the airflow channel 200, and a plugging component 3 disposed on the blade body 1 and sealingly connected to the other end of the airflow channel 200. The blade body 1 is also provided with a plurality of air jet holes 100, one end of which is communicating with the airflow channel 200, and the other end of which is an air outlet disposed on the side of the blade body 1.

[0026] In actual use, compressed gas is introduced into the airflow channel 200 through an external air source. After passing through the jet hole 100, the compressed gas is blown into the area between the pressure roller 4 and the scraper through the air outlet. The blowing causes the pressure in the area between the pressure roller 4 and the scraper to decrease, and it is less than the pressure in the blind hole. As a result, the water stains 700 in the blind hole corresponding to the area between the pressure roller 4 and the scraper are sucked out of the blind hole.

[0027] In the above design, the scraper's structural design and specific implementation method can effectively and quickly suck out the water stains 700 in the blind hole.

[0028] Specifically: such as Figure 1 As shown, several of the air jet holes 100 are arranged laterally along the blade body 1, and the air jet holes 100 are inclined downwards towards the air outlet side.

[0029] In actual use, since the pressure roller 4 has a certain length, usually greater than 1m, several air jet holes 100 are set so that the axial direction of the pressure roller 4 corresponds to several air jet holes 100.

[0030] In the above design, several air jet holes 100 are arranged transversely along the blade body 1, which enables the pressure roller 4 to correspond axially with multiple air jet holes 100, making it easy to quickly suck out the water stains 700 in the blind holes corresponding to the blade body 1 of the entire pressure roller 4.

[0031] Specifically: such as Figure 1 As shown, the spacing between adjacent jet holes 100 is the same.

[0032] In the above design, by setting several air jet holes 100 at equal intervals, it can be ensured that the blown airflow will not be disordered, and that the water stains 700 in the blind holes at each position of the pressure roller 4 can be sucked out.

[0033] Specifically: such as Figure 1 and Figure 2 As shown, the airflow channel 200 extends laterally along the blade body 1, so that the airflow channel 200 passes through both ends of the blade body 1.

[0034] In the above design, by extending the airflow channel 200 laterally along the blade body 1, it is convenient to process the airflow channel 200 during the manufacturing process, and it can also ensure that the performance of each area of ​​the blade body 1 is consistent after processing.

[0035] Specifically: such as Figure 2 As shown, the blade body 1 includes a blade 11 and a blade body. The jet hole 100 and the airflow channel 200 are both disposed on the blade body. The blade body includes a first plate 12, a second plate 13 disposed on one side of the first plate 12, and a third plate 14 disposed on the other side of the first plate 12. The first plate 12, the second plate 13, and the third plate 14 form a groove. The blade 11 is disposed on the upper end of the first plate 12.

[0036] In actual use, the blade 11 contacts the pressure roller 4, and the blade body is fixed by an external fixing mechanism that extends into the slot, thus fixing the entire blade body 1.

[0037] In the above design, the structural design and specific implementation method of the blade body 1 can effectively achieve fixation during actual use.

[0038] Specifically: such as Figure 2 and Figure 3 As shown, one side of the blade body 1 is set as a concave arc surface 101, and the arc door is opposite to the pressure roller 4 during use.

[0039] In actual use, the water stains 700 in the blind hole corresponding to the arc surface 101 will be sucked out.

[0040] In the above design, the concave arc surface 101 on one side of the blade body 1 can slide down along the arc surface 101 after the water stain 700 is sucked out, which makes it easier to clean the water stain 700.

[0041] Specifically: such as Figure 1 and Figure 2 As shown, the cross-sections of the airflow channel 200 and the jet hole 100 are both circular, and the diameter of the jet hole 100 is smaller than the diameter of the airflow channel 200.

[0042] In actual use, compressed gas flows into the jet hole 100 through the airflow channel 200.

[0043] In the above design, the cross-sections of both the airflow channel 200 and the jet hole 100 are circular, which facilitates machining and reduces stress concentration on the scraper caused by machining the airflow channel 200 and the jet hole 100, thus helping to ensure the service life of the scraper. Setting the diameter of the jet hole 100 to be smaller than that of the airflow channel 200 ensures that the airflow rate ejected from the jet hole 100 is sufficiently large to cause pressure changes between the scraper and the pressure roller 4.

[0044] Specifically: such as Figure 2 As shown, the second plate 13 is tilted downwards.

[0045] In actual use, the water stains 700 that are sucked out flow through the arc surface 101 to the second plate 13 and eventually slide down along the second plate 13.

[0046] In the above design, the second plate 13 is set to tilt downwards, which can effectively guide the water stain 700.

[0047] Specifically, a nozzle is provided on the jet hole 100.

[0048] In the above design, by setting a nozzle, the wear on the scraper during the air jet process can be further reduced.

[0049] The second and third embodiments provided in this application are of a scraper, which includes a blade body 1 with an airflow channel 200, an air intake assembly 2 disposed on the blade body 1 and communicating with one end of the airflow channel 200, and a plugging assembly 3 disposed on the blade body 1 and sealingly connected to the other end of the airflow channel 200. The blade body 1 also has a plurality of air jet holes 100, one end of which communicates with the airflow channel 200, and the other end of which is an air outlet located on the side of the blade body 1. The plurality of air jet holes 100 are arranged laterally along the blade body 1, and the air jet holes 100 are inclined downwards towards the air outlet side. The spacing between adjacent air jet holes 100 is the same. The airflow channel 200 extends laterally along the blade body 1, such that the airflow channel 200 passes through both ends of the blade body 1. The blade body 1 includes a blade 11 and a blade body. The air jet 100 and airflow channel 200 are both located on the blade body. The blade body includes a first plate 12, a second plate 13 located on one side of the first plate 12, and a third plate 14 located on the other side of the first plate 12. The first plate 12, second plate 13, and third plate 14 form a groove. The blade 11 is located on the upper end of the first plate 12. One side of the blade body 1 is a concave arc surface 101, which faces the pressure roller 4 during use. The airflow channel 200 and the air jet 100 have circular cross-sections, and the diameter of the air jet 100 is smaller than the diameter of the airflow channel 200. The second plate 13 is inclined downwards. A nozzle is provided on the air jet 100.

[0050] In the above design, the scraper is fixed by the cooperation of the external mechanism and the slot, so that the blade 11 contacts the roller surface of the pressure roller 4. During the rotation of the pressure roller 4, by setting the air jet hole 100 on the scraper, the compressed gas flowing out from the airflow channel 200 along the air jet hole 100 flows at high speed in the area between the scraper and the pressure roller 4, causing the pressure in this area to decrease. This causes the water stains 700 in the blind hole corresponding to this area to be sucked out and flow along the arc surface 101 to the second plate 13, thereby achieving rapid removal of the water stains 700 in the blind hole of the pressure roller 4.

[0051] In further detail, it should be understood that the above description is only a specific embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A scraper, characterized in that: The scraper includes a blade body (1) with an airflow channel (200), an air intake assembly (2) disposed on the blade body (1) and connected to one end of the airflow channel (200), and a plugging assembly (3) disposed on the blade body (1) and sealed to the other end of the airflow channel (200). The blade body (1) is also provided with a plurality of air jet holes (100), one end of the air jet hole (100) is connected to the airflow channel (200), and the other end of the air jet hole (100) is an air outlet, which is disposed on the side of the blade body (1).

2. The scraper according to claim 1, characterized in that: Several of the air jet holes (100) are arranged laterally along the blade body (1), and the air jet holes (100) are inclined downwards towards the air outlet side.

3. The scraper according to claim 1, characterized in that: The spacing between adjacent jet holes (100) is the same.

4. The scraper according to claim 1, characterized in that: The airflow channel (200) extends laterally along the blade body (1), so that the airflow channel (200) passes through both ends of the blade body (1).

5. The scraper according to claim 1, characterized in that: The blade body (1) includes a blade (11) and a blade body. The jet hole (100) and the airflow channel (200) are both provided on the blade body. The blade body includes a first plate (12), a second plate (13) provided on one side of the first plate (12), and a third plate (14) provided on the other side of the first plate (12). The first plate (12), the second plate (13), and the third plate (14) form a slot. The blade (11) is provided on the upper end of the first plate (12).

6. The scraper according to claim 1, characterized in that: The blade body (1) has a concave arc surface (101) on one side, and the arc surface (101) is opposite to the pressure roller (4) during use.

7. The scraper according to claim 1, characterized in that: The cross-sections of the airflow channel (200) and the jet hole (100) are both circular, and the diameter of the jet hole (100) is smaller than the diameter of the airflow channel (200).

8. The scraper according to claim 5, characterized in that: The second plate (13) is tilted downwards.

9. The scraper according to claim 1, characterized in that: A nozzle is provided on the jet hole (100).

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