Device and method for cleaning sticky material on inner wall of pulverized coal bin

Abstract

The present invention discloses a device and a cleaning method for cleaning sticky material on the inner wall of a coal powder bin, comprising: a coal powder bin body and a cleaning device arranged on the coal powder bin body, the cleaning device comprising a driving structure, a scraping structure, a sensing component and a control system; wherein the driving structure is arranged on the coal powder bin body; the scraping structure comprises a support frame detachably connected to the driving structure and a plurality of cleaning components connected to the support frame via elastic parts made of high-carbon steel, so that under the driving force provided by the driving structure, the cleaning components can move up and down in a vertical direction close to the side walls of the coal powder bin to cut and clean the sticky material on the inner wall of the coal powder bin, and at the same time, the elastic parts also serve as buffers to reduce the impact force between the cleaning components and the sticky material; the sensing component is used to observe the offset of the elastic parts in the vertical direction; the control system is used to adjust the continuous movement cleaning mode and the local reciprocating cleaning mode according to the observation results of the sensing component.

Description

Technical Field

[0001] The present invention relates to the technical field of pulverized coal bins, and in particular to a device and a method for cleaning sticky materials on the inner wall of a pulverized coal bin. Background Art

[0002] In thermal power plants, pulverized coal silos are widely used to store and transport pulverized coal and other fuels. Due to the interaction between water vapor within the silo, the moisture content of the pulverized coal itself, and the pulverized coal particles, the stored pulverized coal easily agglomerates and adheres to the silo's inner walls. Over time, this builds up a thick layer of adhesive on the silo's inner walls, affecting the silo's actual storage capacity. Furthermore, temperature fluctuations within the silo, such as condensation caused by nighttime cooling and increased humidity, can also contribute to coal agglomeration.

[0003] Currently, common technologies used to prevent coal dust agglomeration include coal dust silo sealing, pre-drying, continuous temperature and humidity monitoring, moisture-proof chemical additives, and manual cleaning. However, in large industrial facilities such as thermal power plants, drying prevention technologies are costly and cannot completely prevent coal dust agglomeration or the occurrence of damp coal dust adhering to the inner walls of the coal dust silo. To completely remove the sticky material from the inner walls of the coal dust silo, workers need to enter the coal dust silo through a manhole after the coal dust is completely drained to clean the sticky material from the inner walls. However, manual cleaning requires a considerable amount of time and human resources, making it difficult to meet the requirements for efficient and rapid cleaning. Furthermore, due to the large inner wall area of ​​the coal dust silo, the labor intensity is high, and the internal air of the coal dust silo can cause a certain degree of harm to workers, making the cleaning operation somewhat dangerous.

[0004] In view of this, it is necessary to design a device and a method for cleaning sticky material on the inner wall of a pulverized coal bin to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a device and method for cleaning the sticky material on the inner wall of a pulverized coal bin, which can efficiently remove sticky material on the inner wall of the pulverized coal bin and ensure the amount of pulverized coal stored in the bin.

[0006] To achieve the above-mentioned object, the present invention provides a device for cleaning sticky material on the inner wall of a pulverized coal bin, comprising:

[0007] Pulverized coal silo body; and

[0008] The cleaning device is arranged on the pulverized coal bin body and includes: a driving structure, a scraping structure, a sensor component and a control system; wherein,

[0009] A driving structure is provided on the pulverized coal bin body;

[0010] The scraping structure includes a support frame detachably connected to the driving structure and a plurality of cleaning components connected to the support frame via elastic members made of high-carbon steel. Under the driving force provided by the driving structure, the cleaning components can move up and down in the vertical direction close to the side wall of the pulverized coal bin to cut and clean the sticky material on the inner wall of the pulverized coal bin. At the same time, the elastic members also serve as buffers to reduce the impact force between the cleaning components and the sticky material.

[0011] A sensing component, used to observe the displacement of the elastic member in the vertical direction;

[0012] A control system is used to adjust the continuous movement cleaning mode and the local reciprocating cleaning mode according to the observation results of the sensing component.

[0013] As a further improvement of the present invention, the driving structure includes a driving assembly installed on the outer wall of the coal powder bin and a transmission chain driven by the driving assembly. The transmission chain is partially arranged in the coal powder bin, so that under the action of the driving assembly, the transmission chain in the coal powder bin moves up and down in the vertical direction, providing vertical driving force for the support frame.

[0014] As a further improvement of the present invention, the support frame is detachably connected to a transmission chain located inside the pulverized coal bin via a connecting piece.

[0015] As a further improvement of the present invention, at least three driving structures are provided to prevent the support frame from tipping over.

[0016] As a further improvement of the present invention, the sensor assembly includes a sensor body arranged on the support frame and a reflective member arranged on the elastic member.

[0017] As a further improvement of the present invention, several cleaning components are arranged at intervals on the outside of the support frame, and the cleaning shape formed by the several cleaning components is the same as the cross-sectional shape of the pulverized coal bin area to be cleaned, and the size of the cleaning shape is smaller than the cross-sectional size of the pulverized coal bin area to be cleaned.

[0018] As a further improvement of the present invention, the cleaning assembly includes a cleaning frame and a cleaning piece detachably arranged on the cleaning frame, and the cleaning piece is provided with two scrapers with cutting edges facing upward and downward at one end close to the inner wall of the coal powder bin.

[0019] As a further improvement of the present invention, the cleaning member is connected to the cleaning frame via bolts.

[0020] A method for cleaning sticky material on the inner wall of a pulverized coal bin comprises the following steps:

[0021] S1. After the pulverized coal in the pulverized coal bin is completely drained, the scraper structure is installed on the driving structure;

[0022] S2. The drive structure is turned on and a continuous moving cleaning mode is adopted. Under the driving force provided by the drive structure, the cleaning component can move up and down in the vertical direction close to the side wall of the pulverized coal bin to cut and clean the sticky material on the inner wall of the pulverized coal bin. At the same time, the sensor component is used to monitor the vertical displacement of the elastic member.

[0023] S3. When the sensor component detects that the elastic member has reached its maximum vertical displacement length and that increasing the driving force within a certain period of time still fails to drive the scraper structure to move, the sensor component transmits a signal to the control system, which adjusts the cleaning mode to a local reciprocating cleaning mode to clean the current sticky material.

[0024] S4. After the current sticky material is cleaned, the control system adjusts the cleaning mode to the continuous movement cleaning mode to continue cleaning the subsequent sticky material, and adjusts the cleaning mode according to the observation of the sensor component during the cleaning process.

[0025] As a further improvement of the present invention, the local reciprocating cleaning mode is specifically: repeatedly adjusting the driving direction of the driving structure so that the cleaning component is first moved away from the sticky material and then moved toward the sticky material to cut the sticky material multiple times.

[0026] The beneficial effects of the present invention are:

[0027] 1. The design of elastic connection between the support frame and the cleaning assembly of the present invention can utilize the elastic capacity of the elastic member in space. On the one hand, a certain expansion space is given to the cleaning assembly in the horizontal direction, so that the scraper on the cleaning assembly can better fit the inner wall of the coal powder bin to clean the sticky material while avoiding the scraper from damaging the inner wall of the coal powder bin; on the other hand, a certain buffer space can be created between the cleaning assembly and the support frame in the vertical direction. When cleaning the sticky material, after the scraper blade touches the sticky material, it is inserted into the sticky material relatively smoothly under the buffering effect of the elastic member. Then, under the inertia during movement and the continuous pulling force in the same direction as the cutting direction, the cutting action of the scraper is used to complete the cleaning of the sticky material, thereby reducing the damage to the scraper blade caused by the collision between the scraper and the sticky material during cleaning.

[0028] 2. The present invention is provided with a sensor component, which can judge the state of the cleaning component during the cleaning process by observing the elongation of the elastic member, that is, during the sticky material cleaning process, after observing the resistance of the sticky material, under the elastic connection of the elastic member, the cleaning component deviates from the support frame in the vertical direction by a maximum distance. When the driving device continues to run for a certain period of time and still cannot move the scraper, and when the power of the driving source is adjusted to the predetermined maximum driving force and still cannot move the scraper, the information is transmitted to the control system, and the control system adjusts the current cleaning mode from the continuous movement cleaning mode to the local reciprocating cleaning mode, and uses the scraper blade edge to gradually crush the sticky material to complete the cleaning, so as to avoid hard cleaning under the action of continuous tension causing edge breakage, affecting the subsequent cleaning process and the service life of the device.

[0029] 3. The present invention uses a gear-driven transmission chain to control the movement of the support frame, and sets the driving source outside the coal powder bin, which can prevent the coal powder that falls during cleaning from entering the driving source and affecting the driving effect and service life of the driving source; at the same time, the design of partially setting the transmission chain inside the coal powder bin and partially outside the coal powder bin can transport the internal transmission chain to the outside of the coal powder bin when it needs to be cleaned, so that cleaning can be carried out conveniently and quickly to ensure the transmission effect and service life of the transmission chain.

[0030] 4. The present invention sets a continuous moving cleaning mode and a local reciprocating cleaning mode. Under normal agglomeration conditions, the continuous cleaning mode can be used to quickly clean sticky materials. When the coal powder is damp and agglomerated seriously, the local reciprocating cleaning mode can be used to gradually crush and clean the sticky materials. As a result, the cleaning device of the present invention can clean a wider range of agglomeration degrees and has higher cleaning efficiency, avoiding the situation where the scraper cannot complete the cleaning of the sticky materials in one step under the driving force due to excessive agglomeration, causing the device to shut down. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of a device for cleaning sticky material from the inner wall of a pulverized coal bin.

[0032] Figure 2 It is a top view of the device for cleaning sticky material on the inner wall of the pulverized coal bin.

[0033] Figure 3 Schematic diagram of the scraping wall structure.

[0034] Figure 4 This is a schematic diagram of AA.

[0035] Figure 5 It is a structural diagram of the drive structure.

[0036] Figure 6 This is the schematic diagram of the sensing component detection.

[0037] Figure 7 This is another detection principle diagram of the sensing component.

[0038] Reference numerals

[0039] 10. Pulverized coal silo body; 21. Support frame; 211. Connector; 22. Cleaning assembly; 221. Cleaning frame; 222. Cleaning member; 223. Scraper; 23. Elastic member; 31. Reflective photoelectric sensor; 32. Reflective member; 33. Reflective tape; 41. Drive source; 42. First gear; 43. Second gear; 44. Drive chain; 45. Chain hole; 46. Fixing member; DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] It should also be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0042] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0043] like Figure 1 and Figure 4 As shown, the present invention provides a device for cleaning sticky material on the inner wall of a pulverized coal bin, comprising:

[0044] Pulverized coal bin body 10; and

[0045] The cleaning device is arranged on the pulverized coal bin body 10 and includes: a driving structure, a scraping structure, a sensor component and a control system; wherein,

[0046] A driving structure is provided on the pulverized coal bin body 10;

[0047] The scraping structure includes a support frame 21 detachably connected to the driving structure and a plurality of cleaning assemblies 22 connected to the support frame 21 via elastic members 23 made of high-carbon steel. Under the driving force provided by the driving structure, the cleaning assemblies 22 can move up and down in a vertical direction close to the side wall of the pulverized coal bin to cut and clean the sticky material on the inner wall of the pulverized coal bin. At the same time, the elastic members 23 also serve as buffers to reduce the impact force between the cleaning assemblies 22 and the sticky material, thereby reducing damage to the cutting edges of the scrapers 223 of the cleaning assemblies 22 caused by the impact with the sticky material during cleaning.

[0048] A sensing component for observing the vertical displacement of the elastic member 23;

[0049] A control system is used to adjust the continuous movement cleaning mode and the local reciprocating cleaning mode according to the observation results of the sensing component.

[0050] Specifically, the driving structure includes a driving assembly installed on the outer wall of the pulverized coal bin and a transmission chain 44 driven by the driving assembly. The driving assembly includes a driving source 41, a first gear 42 connected to the driving source 41, and a second gear 43 as a driven wheel. The driving source 41 and the first gear 42 are arranged at the lower part of the pulverized coal bin, and the second gear 43 is arranged at the upper part of the pulverized coal bin. The transmission chain 44 is arranged around the first gear 42 and the second gear 43. Part of the transmission chain 44 bypasses the second gear 43 and enters the inside of the pulverized coal bin from the top of the pulverized coal bin, and is output to the outside of the pulverized coal bin through the chain hole 45 at the lower part of the pulverized coal bin ( Figure 5 ), is connected to the first gear 42, so that under the action of the drive assembly, the transmission chain 44 in the coal powder bin moves up and down in the vertical direction, providing a vertical driving force for the support frame 21. By arranging the drive source 41 outside the coal powder bin, it is possible to prevent coal powder that falls during cleaning from entering the drive source 41 and affecting the driving effect and service life of the drive source 41; at the same time, the design of the transmission chain 44 entering from the upper part of the coal powder bin and exiting from the lower part of the coal powder bin, on the one hand, can provide a vertical driving force for the support frame 21, so that the driving force is consistent with the cutting direction of the cleaning assembly 22, thereby improving the utilization rate of the driving force, improving the cutting effect and saving energy costs; on the other hand, when it is necessary to clean the transmission chain 44 inside the coal powder bin, the internal transmission chain 44 can be transported to the outside of the coal powder bin for convenient and rapid cleaning, thereby ensuring the transmission effect and service life of the transmission chain 44.

[0051] Specifically, in this embodiment, a fixing member 46 ( Figure 5 ), a space is formed between the fixing member 46 and the inner wall of the pulverized coal bin to allow the transmission chain 44 to pass through. The provision of the fixing member 46 enables the transmission chain 44 in the pulverized coal bin to remain relatively stable in the vertical direction, thereby maintaining the relative stability of the support frame 21 connected to the transmission chain 44, thereby preventing the support frame 21 from shaking within the inner wall of the pulverized coal bin and affecting the cleaning effect of the cleaning assembly 22.

[0052] Specifically, when the pulverized coal bin is used for coal powder storage, the chain hole 45 is sealed to avoid the formation of a leakage hole there due to the presence of the chain, which affects the storage sealing of the coal powder; when the inner wall of the pulverized coal bin needs to be cleaned, the chain hole 45 is opened to facilitate the movement of the transmission chain 44.

[0053] Specifically, such as Figure 2As shown, the support frame 21 is detachably connected to the transmission chain 44 located inside the pulverized coal bin via a connecting member 211, so that when the transmission chain 44 moves, the support frame 21 moves up and down, and the movement of the support frame 21 drives the cleaning assembly 22 connected to the support frame 21 to move up and down in the vertical direction. In this embodiment, the connecting member 211 is an elastic coupling.

[0054] Specifically, at least three drive structures are provided so that the support frame 21 and the three drive structures can form three stable support points to prevent the support frame 21 from tipping over. In this embodiment, four drive structures are provided, and the four drive structures are respectively provided at the four corners of the coal powder bin.

[0055] Specifically, several cleaning components 22 are arranged at intervals on the outside of the support frame 21. The cleaning shape formed by the several cleaning components 22 is the same as the cross-sectional shape of the pulverized coal bin area to be cleaned, and the size of the cleaning shape is slightly smaller than the cross-sectional size of the pulverized coal bin area to be cleaned, so that the cleaning path of the cleaning component 22 can basically cover the pulverized coal bin area to be cleaned.

[0056] Specifically, such as Figure 3 and Figure 4 As shown, the cleaning assembly 22 includes a cleaning frame 221 and a cleaning member 222 detachably mounted on the cleaning frame 221. In this embodiment, the cleaning member 222 is connected to the cleaning frame 221 by bolts. Two scrapers 223, one with an upward-facing blade and the other with a downward-facing blade, are disposed on one end of the cleaning member 222, near the inner wall of the pulverized coal bin. During the cleaning process, when the scraping mechanism moves downward, the scraper 223 with the downward-facing blade is used to clean sticky material. When the scraping mechanism moves upward, the scraper 223 with the upward-facing blade is used to clean sticky material. Throughout the cleaning process, the scrapers 223 cut and clean sticky material under the action of driving force and inertia.

[0057] Specifically, such as Figure 2 As shown, the sensor assembly includes a sensor body arranged on the support frame 21 and a reflector 32 arranged on the elastic member 23. In this embodiment, the sensor body is a reflective photoelectric sensor 31, as shown in FIG. Figure 6 As shown, when the elastic member 23 is within the normal offset range, the laser energy emitted by the sensor transmitting end is irradiated onto the reflective tape 33 of the reflective member 32 and is reflected back and then received by the receiving end; Figure 7 As shown, when the elastic member 23 reaches the maximum offset length in the vertical direction, the laser cannot irradiate the reflective tape 33 of the reflective member 32, and the receiving end cannot receive the laser, triggering an abnormal alarm signal. At this time, the control system adjusts the cleaning mode to the local reciprocating cleaning mode to clean the current sticky material.

[0058] Specifically, in this embodiment, the elastic member 23 is a leaf spring made of high-carbon steel. It has good fatigue resistance and can withstand repeated loads in the local reciprocating cleaning mode, thereby preventing fatigue fracture during use. It also has good elastic response to adapt to the different movements of the cleaning assembly and maintain the stability and balance of the cleaning assembly.

[0059] A method for cleaning sticky material on the inner wall of a pulverized coal bin comprises the following steps:

[0060] S1. After the pulverized coal in the pulverized coal bin is completely drained, the scraper structure is installed on the driving structure;

[0061] S2. The driving mechanism is turned on and a continuous moving cleaning mode is adopted. The support frame 21, under the action of the driving force, drives the cleaning assembly 22 to move up and down close to the side wall of the pulverized coal bin. The cleaning assembly 22 is used to cut and clean the sticky material on the inner wall of the pulverized coal bin. At the same time, the sensor assembly is used to monitor the vertical displacement of the elastic member 23.

[0062] S3. When the sensor assembly detects that the elastic member 23 has reached its maximum vertical displacement length, the drive device continues to operate for a certain period of time but cannot move the scraper 223, and the scraper 223 still cannot move after the power of the drive source 41 is adjusted to a predetermined maximum driving force, a signal is transmitted to the control system, and the control system adjusts the cleaning mode to a local reciprocating cleaning mode to clean the current sticky material;

[0063] S4. After the current sticky material is cleaned, the control system adjusts the cleaning mode to the continuous movement cleaning mode to continue cleaning the subsequent sticky material, and adjusts the cleaning mode according to the observation of the sensor component during the cleaning process.

[0064] Specifically, the local reciprocating cleaning mode is as follows: adjust the driving direction of the driving structure so that the driving structure drives the support frame 21 to move in the opposite direction until the cleaning component 22 is away from the adhesive material for a certain distance, and then adjust the driving direction of the driving structure again so that the cleaning component 22 cuts the adhesive material, and then repeatedly adjusts the driving direction so that the cleaning component 22 cuts the adhesive material multiple times to gradually crush and clean the adhesive material.

[0065] Specifically, the predetermined maximum driving force is set according to the pulling force that the elastic member 23 can withstand, so that the elastic member 23 will not break under the action of the maximum driving force.

[0066] Specifically, the present invention utilizes an elastic member 23 to connect the support frame 21 and the cleaning assembly 22, enabling the cleaning device to adapt to a wider range of cleaning conditions. Compared to a rigid connection, the present invention's high-modulus elastic connection not only provides sufficient fixing force but also allows for a certain amount of expansion and contraction between the cleaning assembly 22 and the support frame 21. When the agglomerates are small, the elastic member 23's expansion and contraction allows for uninterrupted, continuous cleaning in continuous cleaning mode. When the agglomerates are larger, the cleaning mode is adjusted by combining the determination of the elongation of the elastic member 23 with the control of the driving force, effectively reducing damage to the cleaning device caused by the forces acting during the cleaning process and efficiently completing the cleaning of sticky materials.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A device for cleaning sticky material on the inner wall of a pulverized coal bin, characterized in that: include: Pulverized coal bunker body; as well as The cleaning device is arranged on the pulverized coal bin body and includes: a driving structure, a scraping structure, a sensor component and a control system; wherein, A driving structure is provided on the pulverized coal bin body; The scraping structure includes a support frame detachably connected to the drive structure and a plurality of cleaning components connected to the support frame via elastic members made of high-carbon steel. Under the driving force provided by the drive structure, the cleaning components can move up and down in the vertical direction close to the side wall of the pulverized coal bin to cut and clean the sticky material on the inner wall of the pulverized coal bin. At the same time, the elastic members also serve as buffers to reduce the impact force between the cleaning components and the sticky material. A sensing component, used to observe the displacement of the elastic member in the vertical direction; A control system is used to adjust the continuous movement cleaning mode and the local reciprocating cleaning mode according to the observation results of the sensing component.

2. The device for cleaning sticky material on the inner wall of a pulverized coal bin according to claim 1, characterized in that: The driving structure includes a driving assembly installed on the outer wall of the coal powder bin and a transmission chain driven by the driving assembly. The transmission chain is partially arranged in the coal powder bin, so that under the action of the driving assembly, the transmission chain in the coal powder bin moves up and down in the vertical direction, providing vertical driving force for the support frame.

3. The device for cleaning sticky material on the inner wall of a pulverized coal bin according to claim 2, characterized in that: The support frame is detachably connected to a transmission chain located inside the pulverized coal bin via a connecting piece.

4. The device for cleaning sticky material on the inner wall of a pulverized coal bin according to claim 3, characterized in that: At least three driving structures are provided to prevent the support frame from tipping over.

5. The device for cleaning sticky material on the inner wall of a pulverized coal bin according to claim 1, characterized in that: The sensor assembly includes a sensor body arranged on the support frame and a reflective member arranged on the elastic member.

6. The device for cleaning sticky material on the inner wall of a pulverized coal bin according to claim 1, characterized in that: Several cleaning components are arranged at intervals outside the support frame, and the cleaning shape formed by the several cleaning components is the same as the cross-sectional shape of the coal powder bin area to be cleaned, and the size of the cleaning shape is smaller than the cross-sectional size of the coal powder bin area to be cleaned.

7. The device for cleaning sticky material on the inner wall of a pulverized coal bin according to claim 6, characterized in that: The cleaning assembly comprises a cleaning frame and a cleaning piece detachably arranged on the cleaning frame. The cleaning piece is provided with two scrapers with cutting edges facing upward and downward respectively at one end close to the inner wall of the coal powder bin.

8. The device for cleaning sticky material on the inner wall of a pulverized coal bin according to claim 7, characterized in that: The cleaning piece is connected to the cleaning frame via bolts.

9. A method for cleaning sticky material on the inner wall of a pulverized coal bin, characterized in that: The device for cleaning sticky material on the inner wall of a pulverized coal bin according to claim 1 comprises the following steps: S1. After the pulverized coal in the pulverized coal bin is completely drained, the scraper structure is installed on the driving structure; S2. The drive structure is turned on and a continuous moving cleaning mode is adopted. Under the driving force provided by the drive structure, the cleaning component can move up and down in the vertical direction close to the side wall of the pulverized coal bin to cut and clean the sticky material on the inner wall of the pulverized coal bin. At the same time, the sensor component is used to monitor the vertical displacement of the elastic member. S3. When the sensor component detects that the elastic member has reached its maximum vertical displacement length and that increasing the driving force within a certain period of time still fails to drive the scraper structure to move, the sensor component transmits a signal to the control system, which adjusts the cleaning mode to a local reciprocating cleaning mode to clean the current sticky material. S4. After the current sticky material is cleaned, the control system adjusts the cleaning mode to the continuous movement cleaning mode to continue cleaning the subsequent sticky material, and adjusts the cleaning mode according to the observation of the sensor component during the cleaning process.

10. The cleaning method for cleaning sticky material on the inner wall of a pulverized coal bin according to claim 9, characterized in that: The local reciprocating cleaning mode is specifically: repeatedly adjusting the driving direction of the driving structure so that the cleaning component is first moved away from the adhesive material and then moved toward the adhesive material, so as to cut the adhesive material multiple times.

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