Position correction method for worn longitudinal cutter of slicing machine

Abstract

The invention relates to the technical field of chemical cellulose production, and discloses a position correction method for a worn longitudinal cutter of a slicing machine. The correction method comprises the following steps: acquiring a first wear size of an upper longitudinal cutter and a second wear size of a lower longitudinal cutter; preparing two first correction pads according to the first wear size, and preparing two second correction pads according to the second wear size; taking down the two pads, and correcting the pads according to the first wear size and the second wear size or reprocessing to obtain a third correction pad; each first correction pad is cushioned between the upper gland and one first bearing base, each second correction pad is cushioned between the lower support and one second bearing base, and each third correction pad is cushioned between one first bearing seat and the opposite second bearing seat again. The technical problem that in the prior art, a longitudinal cutter cannot be continuously used due to abrasion is solved, cost is low, and correction efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of chemical cellulose production, and in particular to a method for correcting the position of a slicing machine longitudinal cutting knife after it is worn. Background Art

[0002] The slicer is a device used for cutting and producing cotton paddle boards and wood pulp boards. The cotton paddle boards and wood pulp boards are cut by upper and lower longitudinal cutters, and then cut into rectangular particles by cross cutters. During long-term production, the longitudinal cutters will wear out and their diameter will become smaller, which will cause longitudinal cutting failure and make it impossible to cut cotton paddle boards and wood pulp boards. In the prior art, the cutter is generally replaced directly, or the upper longitudinal cutter is pressed downward by increasing the pressure of the machine cover, and it is cut with the lower longitudinal cutter. However, the cost of replacing the cutter is high, and the method of increasing the pressure of the machine cover can easily cause friction between the cross cutter and the bottom cutter, creating a safety risk. Summary of the invention

[0003] Based on the above, the purpose of the present invention is to provide a method for correcting the position of a slicer longitudinal cutting knife after wear, so as to solve the technical problem in the prior art that the longitudinal cutting knife cannot be used after wear, with low cost and high correction efficiency.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for correcting the position of a worn longitudinal cutting knife of a slicer, the slicer comprising an upper pressure cover and a lower bracket which are relatively detachably connected, the slicer further comprising an upper longitudinal knife and a lower longitudinal knife, the upper pressure cover and the opposite surfaces of the lower bracket are respectively detachably connected with two first bearing seats and two second bearing seats, the two ends of the upper longitudinal knife are respectively connected to the two first bearing seats through a first bearing, a cushion is provided between each of the first bearing seats and an opposite second bearing seat, the two ends of the lower longitudinal knife are respectively connected to the two second bearing seats through a second bearing, the upper pressure cover and the lower bracket can be subjected to a first preload force to approach each other to a preset position, so that the upper longitudinal knife and the lower longitudinal knife are meshed with each other by a preset size, the correction method comprising:

[0006] Acquire a first wear dimension of the upper longitudinal cutter and a second wear dimension of the lower longitudinal cutter;

[0007] preparing two first correction pads according to the first wear size, and preparing two second correction pads according to the second wear size;

[0008] removing the two pads, and correcting the pads according to the first wear size and the second wear size or reprocessing them to obtain a third corrected pad;

[0009] Each of the first correction pads is placed between the upper pressure cover and a first bearing base, each of the second correction pads is placed between the lower bracket and a second bearing base, and each of the third correction pads is re-placed between a first bearing seat and an opposite second bearing seat.

[0010] As a preferred solution for a method of position correction of a slicer longitudinal cutting knife after wear, the current diameter of the upper longitudinal cutting knife is measured and compared with the initial diameter of the upper longitudinal cutting knife to obtain a first wear size of the upper longitudinal cutting knife.

[0011] As a preferred solution for a method of correcting the position of a slicer longitudinal cutting knife after wear, the current diameter of the lower longitudinal cutting knife is measured and compared with the initial diameter of the lower longitudinal cutting knife to obtain a second wear size of the lower longitudinal cutting knife.

[0012] As a preferred solution for a method of correcting the position of a slicer longitudinal cutting blade after wear, the thickness of the first correction pad is prepared to be equal to half of the first wear size, and the thickness of the second correction pad is prepared to be equal to half of the second wear size.

[0013] As a preferred solution of a method for correcting the position of a slicer longitudinal cutting blade after wear, the preparation of a third correction pad includes:

[0014] The two pads are removed, and the thickness of the pads is cut to obtain the third correction pad, and the reduced thickness of the pad is equal to half of the sum of the first wear size and the second wear size.

[0015] As a preferred solution of a method for correcting the position of a slicer longitudinal cutting blade after wear, the preparation of a third correction pad includes:

[0016] The two pads are removed, and a third correction pad is newly prepared, wherein the difference between the thickness of the third correction pad and the thickness of the pad is half of the sum of the first wear size and the second wear size.

[0017] As a preferred solution of a method for correcting the position of a slicer longitudinal cutting blade after wear, each of the first bearing seats is connected to the upper pressure cover by a first connecting bolt, and each of the second bearing seats is connected to the lower bracket by a second connecting bolt. When preparing the first correction pad and the second correction pad, a first connecting hole is processed on each of the first correction pads, and a second connecting hole is processed on each of the second correction pads. After the first correction pad, the second correction pad and the third correction pad are prepared:

[0018] Remove the cushion, and remove the first connecting bolt and the second connecting bolt;

[0019] Placing each of the third correction pads between one of the first bearing seats and an opposite one of the second bearing seats;

[0020] Each of the first correction pads is placed between the first bearing seat and the upper pressure cover, and the first connecting bolt is used to pass through the first connecting hole to connect the upper pressure cover and the first bearing seat; and each of the second correction pads is placed between the second bearing seat and the lower bracket, and the second connecting bolt is used to pass through the second connecting hole to connect the lower bracket and the second bearing seat.

[0021] As a preferred solution of a method for correcting the position of a slicer longitudinal cutting blade after wear, the slicer further comprises a fastening bolt, wherein the fastening bolt is threadedly connected to the upper pressure cover and the lower bracket, and the fastening bolt has a non-working position and a working position. When the fastening bolt is located at the non-working position, a gap exists between the upper longitudinal cutting blade and the lower longitudinal cutting blade. The fastening bolt can be switched to the working position under the first pre-tightening force to fasten the upper pressure cover and the lower bracket to the preset position, so that the upper longitudinal cutting blade and the lower longitudinal cutting blade are engaged with each other by a preset size.

[0022] Before obtaining the first wear size of the upper longitudinal knife and the second wear size of the lower longitudinal knife, the fastening bolts are removed to separate the upper gland and the lower bracket;

[0023] After assembling the first correction pad, the second correction pad and the third correction pad, the upper pressure cover and the lower bracket are connected by the fastening bolts until the fastening bolts are located in the non-working position.

[0024] The beneficial effects of the present invention are:

[0025] The present invention provides a method for correcting the position of a worn longitudinal cutting knife of a slicer, by using a first correction pad and a second correction pad to be respectively padded between an upper pressure cover and a first bearing seat and a lower bracket and a second bearing seat, and by using a third correction pad to be padded between the first bearing seat and the second bearing seat, so that the worn upper longitudinal knife and the lower longitudinal knife are close to each other, that is, the gap between the worn upper longitudinal knife and the lower longitudinal knife becomes smaller, so that the upper pressure cover and the lower bracket do not need to excessively move to make the upper longitudinal knife and the lower longitudinal knife mesh, affecting the use of the transverse cutting knife, thereby ensuring the normal operation of the cutter machine. In addition, the correction method is easy to operate, has a high correction efficiency, and the corrected upper longitudinal knife and the lower longitudinal knife can be used normally, and has a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0027] Figure 1 is a structural schematic diagram of a slicer provided by an embodiment of the present invention;

[0028] Figure 2 is a flow chart of a method for correcting the position of a slicer longitudinal cutting blade after wear provided by an embodiment of the present invention;

[0029] Figure 3 It is a schematic structural diagram of a modified slicer provided in an embodiment of the present invention.

[0030] In the figure:

[0031] 1. Upper pressure cover; 2. Lower bracket; 3. Upper longitudinal knife; 4. Lower longitudinal knife; 5. First bearing seat; 6. Second bearing seat; 7. First bearing; 8. Second bearing; 9. Pad; 10. First correction pad; 11. Second correction pad; 12. Third correction pad; 13. First connecting bolt; 14. Second connecting bolt; 15. Fastening bolt. DETAILED DESCRIPTION

[0032] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0033] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "plurality" means two or more.

[0034] The term "at least one" in this application means one or more, and the term "multiple" in this application means two or more, for example, multiple second messages means two or more second messages. The terms "system" and "network" are often used interchangeably herein.

[0035] It should be understood that the terms used in the description of the various examples herein are only for describing specific examples and are not intended to be limiting. As used in the description of the various examples and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0036] It should also be understood that the term "and / or" used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. The term "and / or" is a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0037] It should also be understood that in the various embodiments of the present application, the size of the serial number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0038] It should be understood that determining B based on A does not mean determining B only based on A. B can also be determined based on A and / or other information.

[0039] It should also be understood that the term “comprise” (also known as “includes,” “including,” “comprises” and / or “comprising”) when used in this specification specifies the presence of stated features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0040] It should also be understood that the term "if" may be interpreted to mean "when" or "upon" or "in response to determining" or "in response to detecting." Similarly, the phrase "if it is determined that ..." or "if [a stated condition or event] is detected" may be interpreted to mean "upon determining that ..." or "in response to determining that ..." or "upon detecting [a stated condition or event]" or "in response to detecting [a stated condition or event]," depending on the context.

[0041] It should be understood that the references to "one embodiment", "an embodiment", or "a possible implementation" throughout the specification mean that specific features, structures, or characteristics related to the embodiment or implementation are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment", or "a possible implementation" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0042] like Figure 1 As shown, the slicer includes an upper pressure cover 1 and a lower bracket 2 which are relatively detachably connected, and an upper longitudinal knife 3 and a lower longitudinal knife 4. The opposite surfaces of the upper pressure cover 1 and the lower bracket 2 are respectively detachably connected with two first bearing seats 5 and two second bearing seats 6. The two ends of the upper longitudinal knife 3 are respectively connected to the two first bearing seats 5 through first bearings 7. Specifically, the upper longitudinal knife 3 has a plurality of blades spaced apart through the first central axis, and the two ends of the first central axis are connected to the first bearing seats 5 through first bearings 7. The blade of the upper longitudinal knife 3 is disc-shaped, and a cushion 9 is provided between each first bearing seat 5 and a relative second bearing seat 6. The two ends of the lower longitudinal knife 4 are respectively connected to the two second bearing seats 6 through second bearings 8. Specifically, the lower longitudinal knife 4 has a plurality of blades spaced apart through the second central axis, and the two ends of the second central axis are connected to the second bearing seats 6 through second bearings 8. The blade of the lower longitudinal knife 4 is disc-shaped. The upper pressure cover 1 and the lower bracket 2 can be subjected to a first preload force to approach each other to a preset position so that the upper longitudinal knife 3 and the lower longitudinal knife 4 engage with each other in a preset size to complete the longitudinal cutting of the material. The first bearing 7 and the second bearing 8 are both matched tapered roller bearings and needle bearings, which play a role in transmission and support. After long-term use, the upper longitudinal knife 3 and the lower longitudinal knife 4 will wear out, resulting in a large gap between the upper longitudinal knife 3 and the lower longitudinal knife 4, and the material cannot be cut. In order to make the worn upper longitudinal knife 3 and the lower longitudinal knife 4 successfully cut the material, Figure 2 and Figure 3 As shown, this embodiment provides a method for correcting the position of a slicer longitudinal cutting knife after it is worn, and the correction method specifically includes the following steps:

[0043] S1: Obtaining a first wear dimension of the upper longitudinal blade 3 and a second wear dimension of the lower longitudinal blade 4;

[0044] Among them, the current diameter of the upper longitudinal knife 3 is measured, and the measured current diameter of the upper longitudinal knife 3 is compared with the initial diameter of the upper longitudinal knife 3. The difference between the current diameter of the upper longitudinal knife 3 and the initial diameter of the upper longitudinal knife 3 is the first wear size of the upper longitudinal knife 3, which is simple and convenient.

[0045] Among them, the current diameter of the lower longitudinal knife 4 is measured, and the measured current diameter of the lower longitudinal knife 4 is compared with the initial diameter of the lower longitudinal knife 4. The difference between the current diameter of the lower longitudinal knife 4 and the initial diameter of the lower longitudinal knife 4 is the second wear size of the lower longitudinal knife 4, which is simple and convenient.

[0046] S2: preparing two first correction pads 10 according to the first wear size, and preparing two second correction pads 11 according to the second wear size;

[0047] In this embodiment, the thickness of the first correction pad 10 is equal to half of the first wear size, and the thickness of the second correction pad 11 is equal to half of the second wear size. Of course, in other embodiments, the thickness of the first correction pad 10 can be other, and the thickness of the second correction pad 11 can be other, which is set according to actual needs.

[0048] S3: removing the two pads 9, and correcting the pads 9 according to the first wear size and the second wear size or reprocessing them to obtain a third corrected pad 12;

[0049] In this embodiment, the third correction pad 12 can be cut from the original pad 9, or it can be newly prepared. The thickness of the pad 9 is cut to obtain the third correction pad 12, and the thickness of the pad 9 is reduced to half the sum of the first wear size and the second wear size; the third correction pad 12 is newly prepared, and the difference between the thickness of the third correction pad 12 and the thickness of the pad 9 is half the sum of the first wear size and the second wear size. Of course, in other embodiments, the thickness of the third correction pad 12 can also be other, which is set according to actual needs.

[0050] S4: Place each first correction pad 10 between the upper pressure cover 1 and a first bearing 7 base, place each second correction pad 11 between the lower bracket 2 and a second bearing 8 base, and re-place each third correction pad 12 between a first bearing seat 5 and an opposite second bearing seat 6.

[0051] The distance between the upper longitudinal knife 3 and the lower longitudinal knife 4 is reduced under the padding effect of the first correction pad 10, and the distance between the lower longitudinal knife 4 and the upper longitudinal knife 3 is reduced under the padding effect of the second correction pad 11, that is, the gap between the upper longitudinal knife 3 and the lower longitudinal knife 4 is reduced. When the thickness of the first correction pad 10 is half of the first wear size and the thickness of the second correction pad 11 is half of the second wear size, the gap between the upper longitudinal knife 3 and the lower longitudinal knife 4 after the first correction pad 10 and the second correction pad 11 are padded is equal to the initial gap between the upper longitudinal knife 3 and the lower longitudinal knife 4, so that when the upper pressure cover 1 and the lower bracket 2 are subjected to the first pre-tightening force, the upper longitudinal knife 3 and the lower longitudinal knife 4 can also be engaged with the preset size, completing the longitudinal cutting of the material while avoiding affecting other functions of the slicer.

[0052] Further, each first bearing seat 5 is connected to the upper gland 1 by a first connecting bolt 13, and each second bearing seat 6 is connected to the lower bracket 2 by a second connecting bolt 14. In step S2, when preparing the first correction pad 10 and the second correction pad 11, a first connecting hole is machined on each first correction pad 10, and a second connecting hole is machined on each second correction pad 11. Specifically, in the correction operation:

[0053] S31: Remove the cushion 9, and remove the first connecting bolt 13 and the second connecting bolt 14;

[0054] S41: Place each third correction pad 12 between a first bearing seat 5 and an opposite second bearing seat 6;

[0055] S42: Place each first correction pad 10 between a first bearing seat 5 and an upper pressure cover 1, and use a first connecting bolt 13 to pass through the first connecting hole to connect the upper pressure cover 1 and the first bearing seat 5; and place each second correction pad 11 between a second bearing seat 6 and a lower bracket 2, and use a second connecting bolt 14 to pass through the second connecting hole to connect the lower bracket 2 and the second bearing seat 6.

[0056] Furthermore, the slicer also includes a fastening bolt 15, which is threadedly connected to the upper cover 1 and the lower bracket 2. The fastening bolt 15 has a non-working position and a working position. When the fastening bolt 15 is in the non-working position, there is a gap between the upper longitudinal knife 3 and the lower longitudinal knife 4. The fastening bolt 15 can be subjected to a first pre-tightening force, i.e., a preset torque, and switched to the working position to fasten the upper cover 1 and the lower bracket 2 to a preset position, so that the upper longitudinal knife 3 and the lower longitudinal knife 4 engage with each other to a preset size. When cutting, the material is placed between the upper longitudinal knife 3 and the lower longitudinal knife 4, and then force is applied to the fastening bolt 15, so that the fastening bolt 15 is tightened to a preset degree, i.e., the upper cover 1 and the lower bracket 2 are close to each other to a preset position, so that the upper longitudinal knife 3 and the lower longitudinal knife 4 engage with each other to a preset size, i.e., the material is cut into, the cutting work is started, and the longitudinal cutting of the material is completed. After long-term use, the upper longitudinal knife 3 and the lower longitudinal knife 4 are worn. When the fastening bolt 15 is subjected to the first pre-tightening force, there is a gap between the upper longitudinal knife 3 and the lower longitudinal knife 4, and the material cannot be cut. At this time, the above method is used to correct the slicer, which specifically includes the following steps:

[0057] Before obtaining the first wear size of the upper longitudinal knife 3 and the second wear size of the lower longitudinal knife 4, remove the fastening bolts 15 to separate the upper pressure cover 1 and the lower bracket 2; this facilitates the measurement of the upper longitudinal knife 3 and the lower longitudinal knife 4, and also facilitates the disassembly of the first bearing seat 5 and the second bearing seat 6 so that the first correction pad 10, the second correction pad 11 and the third correction pad 12 can be assembled.

[0058] After assembling the first correction pad 10, the second correction pad 11 and the third correction pad 12, the upper gland 1 and the lower bracket 2 are connected by the fastening bolt 15 until the fastening bolt 15 is in the non-working position. That is, the position correction of the lower longitudinal knife 4 and the upper longitudinal knife 3 is completed, so that the gap between the upper longitudinal knife 3 and the lower longitudinal knife 4 returns to the initial gap. When it is necessary to cut the material, force is applied to the fastening bolt 15, and the force is consistent with the first pre-tightening force before wear. The upper longitudinal knife 3 and the lower longitudinal knife 4 are close to each other and meshed to the same preset size before wear, ensuring the normal cutting of the material, that is, the normal use of the upper longitudinal knife 3 and the lower longitudinal knife 4, and at the same time ensuring the normal use of other functions of the slicer, such as the normal cutting of the material by the horizontal knife.

[0059] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for correcting the position of a slicer longitudinal cutting knife after wear, the slicer comprising an upper pressure cover and a lower bracket that are relatively detachably connected, the slicer also comprising an upper longitudinal knife and a lower longitudinal knife, the upper pressure cover and the opposite surfaces of the lower bracket are respectively detachably connected to two first bearing seats and two second bearing seats, the two ends of the upper longitudinal knife are respectively connected to the two first bearing seats through a first bearing, a cushion is provided between each of the first bearing seats and an opposite second bearing seat, the two ends of the lower longitudinal knife are respectively connected to the two second bearing seats through a second bearing, the upper pressure cover and the lower bracket can be subjected to a first preload force to approach each other to a preset position, so that the upper longitudinal knife and the lower longitudinal knife are meshed with each other by a preset size, characterized in that The correction method comprises: Acquire a first wear dimension of the upper longitudinal cutter and a second wear dimension of the lower longitudinal cutter; preparing two first correction pads according to the first wear size, and preparing two second correction pads according to the second wear size; removing the two pads, and correcting the pads according to the first wear size and the second wear size or reprocessing them to obtain a third corrected pad; Each of the first correction pads is placed between the upper pressure cover and a first bearing base, each of the second correction pads is placed between the lower bracket and a second bearing base, and each of the third correction pads is re-placed between a first bearing seat and an opposite second bearing seat.

2. The method for correcting the position of a slicer longitudinal cutting blade after wear according to claim 1, characterized in that: The current diameter of the upper longitudinal cutter is measured and compared with the initial diameter of the upper longitudinal cutter to obtain a first wear dimension of the upper longitudinal cutter.

3. The method for correcting the position of a slicer longitudinal cutting blade after wear according to claim 1, characterized in that: The current diameter of the lower longitudinal knife is measured and compared with the initial diameter of the lower longitudinal knife to obtain a second wear dimension of the lower longitudinal knife.

4. The method for correcting the position of a slicer longitudinal cutting blade after wear according to claim 1, characterized in that: The first correction pad is prepared to have a thickness equal to half of the first wear size, and the second correction pad is prepared to have a thickness equal to half of the second wear size.

5. The method for correcting the position of a slicer longitudinal cutting blade after wear according to claim 1, characterized in that: The third correction pad is prepared including: The two pads are removed, and the thickness of the pads is cut to obtain the third correction pad, and the reduced thickness of the pad is equal to half of the sum of the first wear size and the second wear size.

6. The method for correcting the position of a slicer longitudinal cutting blade after wear according to claim 1, characterized in that: The third correction pad is prepared including: The two pads are removed, and a third correction pad is newly prepared, wherein the difference between the thickness of the third correction pad and the thickness of the pad is half of the sum of the first wear size and the second wear size.

7. The method for correcting the position of a slicer longitudinal cutting blade after wear according to claim 1, wherein each of the first bearing seats is connected to the upper gland by a first connecting bolt, and each of the second bearing seats is connected to the lower bracket by a second connecting bolt, characterized in that: When preparing the first correction pad and the second correction pad, a first connection hole is processed on each of the first correction pads, and a second connection hole is processed on each of the second correction pads. After the first correction pad, the second correction pad and the third correction pad are prepared: Remove the cushion, and remove the first connecting bolt and the second connecting bolt; Placing each of the third correction pads between one of the first bearing seats and an opposite one of the second bearing seats; Each of the first correction pads is placed between the first bearing seat and the upper pressure cover, and the first connecting bolt is used to pass through the first connecting hole to connect the upper pressure cover and the first bearing seat; and each of the second correction pads is placed between the second bearing seat and the lower bracket, and the second connecting bolt is used to pass through the second connecting hole to connect the lower bracket and the second bearing seat.

8. The method for correcting the position of a slicer longitudinal cutting knife after wear according to claim 7, wherein the slicer further comprises a fastening bolt, wherein the fastening bolt is threadedly connected to the upper pressure cover and the lower bracket, wherein the fastening bolt has a non-working position and a working position, wherein when the fastening bolt is located in the non-working position, there is a gap between the upper longitudinal knife and the lower longitudinal knife, and the fastening bolt can be switched to the working position under the first pre-tightening force to fasten the upper pressure cover and the lower bracket to the preset position, so that the upper longitudinal knife and the lower longitudinal knife engage with each other by a preset size, characterized in that Before obtaining the first wear size of the upper longitudinal knife and the second wear size of the lower longitudinal knife, the fastening bolts are removed to separate the upper gland and the lower bracket; After assembling the first correction pad, the second correction pad and the third correction pad, the upper pressure cover and the lower bracket are connected by the fastening bolts until the fastening bolts are located in the non-working position.

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