A cutting device for rack processing and manufacturing

Abstract

The present invention provides a cutting device for rack processing and manufacturing, which relates to the field of rack processing technology, and includes: an equipment main body; two first guide columns are welded on the top surface of the equipment main body, a mounting arm slides on the two first guide columns, a mounting arm slides on the mounting arm, and a cutting machine is fixed on the bottom end surface of the mounting arm; a first hydraulic cylinder is fixed on the top surface of the equipment main body, and the protruding end of the first hydraulic cylinder is fixed on the mounting arm; a connecting base block slides on the two first guide columns. Through the coordinated arrangement of the protective part and the cleaning part, on the one hand, the protective part can achieve the protection of sparks and cutting blades, and the cleaning part can achieve the collection of residues on the equipment main body; on the other hand, because the rear end face of the cleaning block contacts the rear end face of the protective plate after the two first electric cylinders are retracted, during use, when the flying cutting blade hits the protective plate, the support of the cleaning block on the protective plate can improve the protective ability of the protective plate, and the safety is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of rack processing, and in particular to a cutting device used for rack processing and manufacturing. Background Art

[0002] A rack, a specialized gear with teeth distributed across a bar-shaped body, plays a key role in mechanical transmission. Working closely with the gear, it converts rotation into motion and vice versa, making it a crucial component for many mechanical devices to achieve specific motion patterns. There are many different types of racks, and cylindrical racks are one such type. Cylindrical rack machining requires cutting equipment to cut the cylindrical tubular blank.

[0003] At present, the cutting equipment used for cylindrical rack processing still has the following shortcomings during use:

[0004] Although the existing device can be provided with a protective baffle, it cannot cooperate with other structures on the cutting equipment to achieve improved protection effects; the existing device requires a hydraulic cylinder to drive the cutting machine to move for cutting, and emergency cutting cannot be performed when the hydraulic cylinder is damaged.

[0005] Therefore, in view of this, the existing structure and defects are studied and improved, and a cutting device for rack processing and manufacturing is provided to achieve a more practical purpose. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a cutting device for rack processing and manufacturing, so as to solve the problem that although the existing device can be equipped with a protective baffle, it cannot cooperate with other structures on the cutting equipment to achieve improved protection effect; the existing device needs to use a hydraulic cylinder to drive the cutting machine to move for cutting, and when the hydraulic cylinder is damaged, emergency cutting cannot be performed.

[0007] The present invention provides a cutting device for rack processing and manufacturing, which specifically includes: an equipment main body; two first guide columns are welded on the top surface of the equipment main body, and mounting arms are slid on the two first guide columns, and the mounting arms are slid on the mounting arms, and a cutting machine is fixed on the bottom end surface of the mounting arms; a first hydraulic cylinder is fixed on the top surface of the equipment main body, and the protruding end of the first hydraulic cylinder is fixed on the mounting arm; a connecting base block is slid on the two first guide columns, and the connecting base block is an H-shaped structure, and a second hydraulic cylinder is fixed on the top surface of the equipment main body, and the protruding end of the second hydraulic cylinder is fixed on the bottom end surface of the connecting base block; two clamping seats are fixed on the front end surface of the connecting base block, and the two clamping seats are both concave structures, and two third hydraulic cylinders are fixed on the top surface of the inner wall of each clamping seat, and the protruding ends of the two second hydraulic cylinders on the left are fixed on one clamping block, and the protruding ends of the two second hydraulic cylinders on the right are fixed on another clamping block, and pipe fittings are clamped between the two clamping blocks and the two clamping seats.

[0008] Furthermore, the connecting base block, the clamping seat, the second hydraulic cylinder, the third hydraulic cylinder and the clamping block together constitute a clamping portion; the clamping seat and the clamping block are both provided with a V-shaped clamping groove.

[0009] Furthermore, two spring rods are fixed to the bottom end surface of the mounting arm, and a unloading block is fixed to the protruding end of each spring rod. The two unloading blocks are both located below the pipe fitting, and the front sides of the two unloading blocks are inclined structures. When the two unloading blocks move upward, the inclined surfaces of the unloading blocks contact the bottom end surface of the outer wall of the pipe fitting.

[0010] Furthermore, the first guide column, the mounting arm, the cutting machine, the first hydraulic cylinder, the spring rod and the discharge block together constitute a cutting part.

[0011] Furthermore, a protective part is installed on the equipment body, which is composed of a sliding arm and a protective plate. A sliding arm is fixed to the left end face and the right end face of the equipment body, and a protective plate slides on the two sliding arms. The protective plate is located directly in front of the cutting machine.

[0012] Furthermore, the protective plate is a T-shaped plate structure, the transverse portion of the protective plate is aligned with the mounting arm, and when the mounting arm moves upward, it contacts the transverse portion of the protective plate.

[0013] Furthermore, a limiting part is installed on the equipment body, and the limiting part is composed of a second electric cylinder and a limiting block. A second electric cylinder is fixed on the top surface of the equipment body, and a limiting block is fixed on the protruding end of the second electric cylinder. The left end surface of the limiting block contacts the right end of the pipe fitting.

[0014] Furthermore, a cleaning part is installed on the main body of the equipment, and the cleaning part is composed of a first electric cylinder and a cleaning block. Two first electric cylinders are fixed on the top surface of the main body of the equipment, and the protruding ends of the two first electric cylinders are fixed on the cleaning block. The cleaning block is a rectangular block structure, and the bottom end surface of the cleaning block is in contact with the top surface of the main body of the equipment.

[0015] Furthermore, a cleaning hole is provided at the rear side of the top end surface of the device body. The cleaning hole is a rectangular hole structure. The cleaning hole is aligned with the cleaning block, and the width of the cleaning hole is equal to the width of the cleaning block. A collection box is fixed on the bottom end surface of the device body, and the collection box is located directly below the cleaning hole.

[0016] Furthermore, after the two first electric cylinders have completed their contraction, the rear end surface of the cleaning block contacts the rear end surface of the protective plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] Through the coordinated arrangement of the cutting part and the clamping part, firstly, the height adjustment of the cutting machine can be realized by driving the first hydraulic cylinder, thereby completing the cutting action; secondly, when the first hydraulic cylinder is damaged, the upward movement of the pipe can be realized by extending the second hydraulic cylinder, and the cutting action can also be completed when the pipe contacts the cutting machine during the upward movement. Compared with the existing device, the present device has a better emergency effect, and even if the first hydraulic cylinder is damaged, it will not affect the normal cutting.

[0019] Through the coordinated setting of the cutting part and the protective part, the cutting machine needs to be driven to move upward after the cutting is completed. When the cutting machine moves upward, the protective plate can be driven to open through the mounting arm. There is no need to use a separate electric component to drive the opening of the protective plate, which saves costs and improves the structural coordination of the equipment.

[0020] Through the coordinated arrangement of the clamping part and the cleaning part, on the one hand, when the second hydraulic cylinder drives the clamping seat to move upward, the pipe cutting action can be completed; on the other hand, after the second hydraulic cylinder drives the clamping seat to move upward, the cleaning block can also be conveniently moved to the rear of the clamping seat, which facilitates the cleaning of the top surface of the equipment body and reflects better structural rationality.

[0021] Through the coordinated arrangement of the protection part and the cleaning part, on the one hand, the protection part can realize the protection of sparks and cutting blades, and the cleaning part can realize the collection of residues on the equipment body; on the other hand, because the rear end face of the cleaning block contacts the rear end face of the protection plate after the two first electric cylinders are retracted, during use, when the flying cutting blade hits the protection plate, the protection ability of the protection plate can be improved under the supporting effect of the cleaning block on the protection plate, and the safety is higher.

[0022] The arrangement of the cleaning hole and the collecting box can cooperate with the cleaning part to realize rapid cleaning of residues on the equipment body, and the cleaning is quick and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0024] In the attached figure:

[0025] Figure 1 The figure shows an axial structural schematic diagram of a cutting device for manufacturing a rack according to the present invention;

[0026] Figure 2 A schematic diagram of the front structure of a cutting device for manufacturing a rack according to the present invention is shown;

[0027] Figure 3 A schematic top view of the structure of a cutting device for manufacturing a rack according to the present invention is shown;

[0028] Figure 4 A left-side structural schematic diagram of a cutting device for rack machining and manufacturing according to the present invention is shown;

[0029] Figure 5 It shows that according to the present invention Figure 4 A schematic diagram of the enlarged structure at point A;

[0030] Figure 6 It shows a partially cutaway axial structural schematic diagram of a cutting device for rack machining according to the present invention;

[0031] Figure 7 It shows an axial structural schematic diagram of the clamping portion according to the present invention;

[0032] Figure 8 A schematic diagram of the axial structure of the cutting portion according to the present invention is shown.

[0033] Reference Signs List

[0034] 1. Equipment body; 101. Cleaning hole; 102. Collection box;

[0035] 2. Cutting unit; 201. First guide column; 202. Mounting arm; 203. Cutting machine; 204. First hydraulic cylinder; 205. Spring rod; 206. Discharge block;

[0036] 3. Clamping part; 301. Connecting base block; 302. Clamping seat; 303. Second hydraulic cylinder; 304. Third hydraulic cylinder; 305. Clamping block;

[0037] 4. Pipe fittings;

[0038] 5. Protective part; 501. Sliding arm; 502. Protective plate;

[0039] 6. Cleaning unit; 601. First electric cylinder; 602. Cleaning block;

[0040] 7. Limiting part; 701. Second electric cylinder; 702. Limiting block. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined in this manner in the embodiments of the present invention.

[0043] The terms "first," "second," and similar terms used in the embodiments of the present invention do not indicate any order, quantity, or importance, but are simply used to distinguish different components. Terms such as "a," "an," or "the" do not indicate a limit on quantity, but rather indicate the presence of at least one. Similarly, terms such as "include" or "comprise" mean that the element or object preceding the term encompasses the elements or objects listed after the term, and their equivalents, without excluding other elements or objects. In the following description, spatial and directional terms such as "upper," "lower," "front," "back," "top," "bottom," "vertical," and "horizontal" may be used to describe embodiments of the present invention. However, it should be understood that these terms are used solely to facilitate the description of the embodiments shown in the figures and do not require that the actual device be constructed or operated in a specific orientation. In the following description, terms such as "connect," "couple," "fixed," and "attached" may refer to a direct connection between two elements or structures without any other elements or structures between them, or an indirect connection between two elements or structures through an intermediate element or structure, unless otherwise expressly stated herein.

[0044] Example 1:

[0045] As attached Figure 1 To the attached Figure 8 As shown:

[0046] The present invention provides a cutting device for rack processing and manufacturing, comprising: an equipment main body 1; two first guide columns 201 are welded to the top surface of the equipment main body 1, mounting arms 202 slide on the two first guide columns 201, mounting arms 202 slide on the mounting arms 202, and a cutting machine 203 is fixed to the bottom end surface of the mounting arms 202; a first hydraulic cylinder 204 is fixed to the top surface of the equipment main body 1, and the extended end of the first hydraulic cylinder 204 is fixed to the mounting arm 202; a connecting base block 301 slides on the two first guide columns 201, and the connecting base block 301 is an H-shaped structure, a second hydraulic cylinder 303 is fixed to the top surface of the equipment main body 1, and the extended end of the second hydraulic cylinder 303 is fixed to the bottom end surface of the connecting base block 301; two clamping seats 302 are fixed to the front end surface of the connecting base block 301, and the two clamping seats 302 are Concave structure, two third hydraulic cylinders 304 are fixed on the top surface of the inner wall of each clamping seat 302, the protruding ends of the two second hydraulic cylinders 303 on the left are fixed on a clamping block 305, and the protruding ends of the two second hydraulic cylinders 303 on the right are fixed on another clamping block 305, and the pipe fitting 4 is clamped between the two clamping blocks 305 and the two clamping seats 302. When cutting the pipe fitting 4, the cutting machine 203 is started to drive the first hydraulic cylinder 204 to retract. At this time, the cutting machine 203 moves downward to complete the cutting of the pipe fitting 4; when the first hydraulic cylinder 204 is damaged and cannot be extended, the second hydraulic cylinder 303 is driven to extend, and the second hydraulic cylinder 303 drives the connecting base block 301 and the clamping seat 302 to move upward, and at this time the upward movement of the pipe fitting 4 is realized, and the emergency cutting is completed by the extension of the second hydraulic cylinder 303.

[0047] Among them, the connecting base block 301, the clamping seat 302, the second hydraulic cylinder 303, the third hydraulic cylinder 304 and the clamping block 305 together constitute the clamping part 3; the clamping seat 302 and the clamping block 305 are both provided with a V-shaped clamping groove. During use, the V-shaped clamping groove can improve the stability of clamping.

[0048] Among them, two spring rods 205 are fixed to the bottom end surface of the mounting arm 202, and a discharge block 206 is fixed to the protruding end of each spring rod 205. The two discharge blocks 206 are both located below the pipe fitting 4, and the front sides of the two discharge blocks 206 are inclined structures. When the two discharge blocks 206 move upward, the inclined surfaces of the discharge blocks 206 contact the bottom end surface of the outer wall of the pipe fitting 4. After the first hydraulic cylinder 204 drives the mounting arm 202 to move upward, the cut pipe fitting 4 can be lifted by the two discharge blocks 206. At this time, the pipe fitting 4 slides forward under the guidance of the inclined surface on the discharge block 206, realizing the unloading of the cut pipe fitting 4. Compared with the existing device, this device does not require a separate drive for unloading, and the structure is more reasonable.

[0049] The first guide column 201 , the mounting arm 202 , the cutter 203 , the first hydraulic cylinder 204 , the spring rod 205 and the discharge block 206 together constitute the cutting portion 2 .

[0050] Among them, a protective part 5 is installed on the equipment body 1, and the protective part 5 is composed of a sliding arm 501 and a protective plate 502. A sliding arm 501 is fixed to the left end face and the right end face of the equipment body 1, and a protective plate 502 slides on the two sliding arms 501. The protective plate 502 is located directly in front of the cutting machine 203. During use, the sparks generated by cutting will be blocked by the protective plate 502 and will not hurt the staff on the front side. When the cutting blade breaks and flies forward, it can also be blocked by the protective plate 502, thereby improving the safety of the equipment.

[0051] Among them, the protective plate 502 is a T-shaped plate structure, and the horizontal part of the protective plate 502 is aligned with the mounting arm 202. When the mounting arm 202 moves upward, it contacts the horizontal part of the protective plate 502. During use, when the mounting arm 202 continues to move upward, the protective plate 502 can be opened. Compared with the existing device, this device does not need to separately drive the protective plate 502 to open, which saves costs and improves structural performance.

[0052] Among them, a limiting part 7 is installed on the equipment main body 1, and the limiting part 7 is composed of a second electric cylinder 701 and a limiting block 702. A second electric cylinder 701 is fixed on the top surface of the equipment main body 1, and a limiting block 702 is fixed on the protruding end of the second electric cylinder 701. The left end face of the limiting block 702 is in contact with the right end of the pipe fitting 4. During use, the pipe fitting 4 is limited by the limiting block 702, which can better control the cutting length of the pipe fitting 4, and after the second electric cylinder 701 is extended and retracted, the cutting length limit of the pipe fitting 4 can be adjusted, and the adjustability is high.

[0053] Among them, a cleaning part 6 is installed on the equipment body 1, and the cleaning part 6 is composed of a first electric cylinder 601 and a cleaning block 602. Two first electric cylinders 601 are fixed to the top surface of the equipment body 1. The extended ends of the two first electric cylinders 601 are fixed on the cleaning block 602. The cleaning block 602 is a rectangular block structure. The bottom end surface of the cleaning block 602 contacts the top surface of the equipment body 1. When it is necessary to collect the residue on the top surface of the equipment body 1, the first hydraulic cylinder 204 is first driven to extend. At this time, the mounting arm 202 drives the cutting The machine 203, the two unloading blocks 206 and the protective plate 502 move upward until the bottom end surfaces of the unloading block 206 and the protective plate 502 are higher than the cleaning block 602, and then the second hydraulic cylinder 303 is driven to extend, and the second hydraulic cylinder 303 drives the connecting base block 301 and the two clamping seats 302 to move upward until the height of the two clamping seats 302 is higher than the height of the cleaning block 602; the two first electric cylinders 601 are driven to extend, and the two first electric cylinders 601 drive the cleaning block 602 to move backward to complete the collection of the residue.

[0054] Among them, a cleaning hole 101 is opened at the rear side of the top surface of the device main body 1. The cleaning hole 101 is a rectangular hole structure. The cleaning hole 101 is aligned with the cleaning block 602, and the width of the cleaning hole 101 is equal to the width of the cleaning block 602; a collecting box 102 is fixed on the bottom end surface of the device main body 1, and the collecting box 102 is located directly below the cleaning hole 101. When the cleaning block 602 moves backward, the residue on the top surface of the device main body 1 can be collected into the cleaning hole 101, and then fall into the collection box 102 through the cleaning hole 101 for collection.

[0055] Example 2:

[0056] On the basis of the first embodiment, it also includes: when the two first electric cylinders 601 are completely retracted, the rear end surface of the cleaning block 602 contacts the rear end surface of the protective plate 502. During use, the protective strength of the protective plate 502 can be improved, and the protection capability against flying cutting blades is improved.

[0057] The specific usage and function of this embodiment are as follows:

[0058] Place the pipe 4 in the clamping grooves on the two clamping seats 302, push the pipe 4 to the right until the right end face of the pipe 4 contacts the left end face of the limit block 702, and drive the four third hydraulic cylinders 304 to extend. At this time, the two clamping blocks 305 and the clamping seat 302 complete the clamping of the pipe 4; start the cutting machine 203, drive the first hydraulic cylinder 204 to retract, and at this time the cutting machine 203 moves downward to complete the cutting of the pipe 4; when the first hydraulic cylinder 204 is damaged and cannot be extended, drive the second hydraulic cylinder 204 to retract. The cylinder 303 is extended, and the second hydraulic cylinder 303 drives the connecting base block 301 and the clamping seat 302 to move upward, at this time the pipe 4 is moved upward, and the emergency cutting is completed by the extension of the second hydraulic cylinder 303; after the cutting is completed, the cut pipe 4 needs to be unloaded. When unloading, first release the clamping block 305, and then drive the first hydraulic cylinder 204 to extend. After the first hydraulic cylinder 204 drives the mounting arm 202 to move upward, the cut pipe 4 can be unloaded through the two unloading blocks 206. The pipe fitting 4 is lifted, and at this time, the pipe fitting 4 slides forward under the guidance of the inclined surface of the discharge block 206, so that the pipe fitting 4 after cutting is discharged; when it is necessary to collect the residue on the top surface of the equipment body 1, the first hydraulic cylinder 204 is first driven to extend, and at this time the mounting arm 202 drives the cutting machine 203, the two discharge blocks 206 and the protective plate 502 to move upward until the bottom end surfaces of the discharge block 206 and the protective plate 502 are higher than the cleaning block 602, and then the second hydraulic cylinder 303 is driven to extend, and the second hydraulic cylinder 303 is driven to extend. The cylinder 303 drives the connecting base block 301 and the two clamping seats 302 to move upward until the height of the two clamping seats 302 is higher than the height of the cleaning block 602; the two first electric cylinders 601 are driven to extend, and the two first electric cylinders 601 drive the cleaning block 602 to move backward to complete the collection of residues. When the cleaning block 602 moves backward, the residue on the top surface of the equipment body 1 can be collected into the cleaning hole 101, and then fall into the collection box 102 through the cleaning hole 101 for collection.

[0059] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. The protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A cutting device for rack processing and manufacturing, characterized in that: include: The device body (1) comprises two first guide columns (201) welded on the top surface of the device body (1), a mounting arm (202) sliding on the two first guide columns (201), a mounting arm (202) sliding on the mounting arm (202), and a cutting machine (203) fixed on the bottom end surface of the mounting arm (202); a first hydraulic cylinder (204) is fixed on the top surface of the device body (1), and the protruding end of the first hydraulic cylinder (204) is fixed on the mounting arm (202); a connecting base block (301) sliding on the two first guide columns (201), the connecting base block (301) being an H-shaped structure, and a first hydraulic cylinder (204) is fixed on the top surface of the device body (1). Two hydraulic cylinders (303), the extended end of the second hydraulic cylinder (303) is fixed to the bottom end surface of the connecting base block (301); two clamping seats (302) are fixed to the front end surface of the connecting base block (301), both of the clamping seats (302) are concave structures, and two third hydraulic cylinders (304) are fixed to the top end surface of the inner wall of each clamping seat (302), the extended ends of the two second hydraulic cylinders (303) on the left side are fixed to one clamping block (305), and the extended ends of the two second hydraulic cylinders (303) on the right side are fixed to another clamping block (305), and the pipe fitting (4) is clamped between the two clamping blocks (305) and the two clamping seats (302); Two spring rods (205) are fixed to the bottom end surface of the mounting arm (202), and a discharge block (206) is fixed to the protruding end of each spring rod (205). The two discharge blocks (206) are both located below the pipe (4), and the front sides of the two discharge blocks (206) are both inclined structures. When the two discharge blocks (206) move upward, the inclined surfaces of the discharge blocks (206) contact the bottom end surface of the outer wall of the pipe (4); A protective part (5) is installed on the device body (1), and the protective part (5) is composed of a sliding arm (501) and a protective plate (502). A sliding arm (501) is fixed to the left end face and the right end face of the device body (1), and a protective plate (502) slides on the two sliding arms (501). The protective plate (502) is located in front of the cutting machine (203); The protective plate (502) is a T-shaped plate structure. The transverse portion of the protective plate (502) is aligned with the mounting arm (202). When the mounting arm (202) moves upward, it contacts the transverse portion of the protective plate (502).

2. A cutting device for rack manufacturing according to claim 1, characterized in that: The connecting base block (301), the clamping seat (302), the second hydraulic cylinder (303), the third hydraulic cylinder (304) and the clamping block (305) together constitute the clamping portion (3); the clamping seat (302) and the clamping block (305) are both provided with a clamping groove of a V-shaped structure.

3. A cutting device for rack manufacturing according to claim 2, characterized in that: The first guide column (201), the mounting arm (202), the cutting machine (203), the first hydraulic cylinder (204), the spring rod (205) and the discharge block (206) together constitute the cutting portion (2).

4. A cutting device for rack manufacturing according to claim 3, characterized in that: A limiting portion (7) is installed on the device body (1), and the limiting portion (7) is composed of a second electric cylinder (701) and a limiting block (702). A second electric cylinder (701) is fixed to the top surface of the device body (1), and a limiting block (702) is fixed to the protruding end of the second electric cylinder (701). The left end surface of the limiting block (702) contacts the right end of the pipe (4).

5. A cutting device for rack manufacturing according to claim 4, characterized in that: A cleaning portion (6) is installed on the device body (1), and the cleaning portion (6) is composed of a first electric cylinder (601) and a cleaning block (602). Two first electric cylinders (601) are fixed to the top surface of the device body (1), and the protruding ends of the two first electric cylinders (601) are fixed to the cleaning block (602). The cleaning block (602) is a rectangular block structure, and the bottom end surface of the cleaning block (602) contacts the top surface of the device body (1).

6. A cutting device for rack manufacturing according to claim 5, characterized in that: A cleaning hole (101) is provided at the rear side of the top end surface of the device body (1). The cleaning hole (101) is a rectangular hole-shaped structure. The cleaning hole (101) is aligned with the cleaning block (602). The width of the cleaning hole (101) is equal to the width of the cleaning block (602). A collecting box (102) is fixed to the bottom end surface of the device body (1). The collecting box (102) is located directly below the cleaning hole (101).

7. A cutting device for rack manufacturing according to claim 6, characterized in that: When the two first electric cylinders (601) have completed their contraction, the rear end surface of the cleaning block (602) contacts the rear end surface of the protective plate (502).

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