Shield body structure suitable for ultra-small vertical curve turning radius

Abstract

The invention discloses a shield body structure adapting to an ultra-small vertical curve turning radius, and relates to the technical field of shield construction, the shield body structure comprises a cutterhead, the bottom of the cutterhead is detachably provided with a reducing cushion block, the reducing cushion block divides the cutterhead into a center block and four side blocks, and the reducing cushion block comprises four front connecting blocks and four side connecting blocks; the four front connecting blocks are detachably connected with the center block and the four side blocks, the four side connecting blocks are detachably connected with the four front connecting blocks and the four side blocks respectively, a hobbing cutter is detachably installed at the bottom of the cutter head, and side scrapers are detachably installed on the side edges of the cutter head. According to the variable-diameter cutterhead, the cutterhead adopts a block type structural design, a main bearing is configured according to the loading condition of the maximum variable-diameter cutterhead, for cavities with different diameters, the initial excavation diameter of the cutterhead is not changed, variable-diameter blocks with different sizes are configured according to the variable-diameter requirement of the excavation diameter of the cutterhead in the construction process, 0-1.5 m variable-diameter of the cutterhead is achieved, and the variable-diameter requirement of the cutterhead for various excavation diameters is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shield construction, in particular to a shield body structure suitable for super-small vertical curve turning radius. BACKGROUND

[0002] Tunnel boring machine (TBM) is a comprehensive equipment for continuous operation by breaking rock, removing spoil and supporting with machinery. According to the cutting process of the boring machine on the working face, it is divided into full-face tunnel boring machine and partial-face tunnel boring machine. According to the different principles of breaking rock, it can be divided into rolling type (disc cutter) boring machine and milling type boring machine. The rolling type full-face tunnel boring machine is suitable for medium-hard rock to hard rock. The milling type boring machine is suitable for coal seam and soft rock. Under the axial pressure of the push cylinder, the motor drives the cutter disc to rotate and cuts and crushes the rock. TBM, as the most advanced large equipment in underground engineering construction, integrates many processes such as tunneling, spoil removal and supporting, and can realize one-step forming of tunnel construction, with the advantages of high efficiency, safety and economic benefits. TBM is also more and more widely used in the construction of tunnels in the fields of railway, water conservancy, hydropower, subway and mine in China.

[0003] When a tunnel is constructed by using the TBM construction method, the tunneling direction of the TBM needs to be controlled according to the tunnel design axis, and the tunneling route of the TBM needs to be controlled within the deviation range of the tunnel design axis, which plays a crucial role in ensuring the quality of tunnel construction.

[0004] With the increasing requirements of pilot shaft construction, the engineering purposes of pilot shaft are more and more extensive, and the construction of pilot shaft also begins to appear the case of super-small vertical curve turning radius. The conventional main beam open type TBM is difficult to meet the requirements of the construction of pilot shaft with super-small vertical curve turning radius. SUMMARY

[0005] Based on the problems in the background art, the present application aims to provide a shield body structure suitable for super-small vertical curve turning radius, to solve the problem of safe and efficient tunneling of TBM in super-small vertical curve turning in the related art.

[0006] The present application is realized by the following technical scheme:

[0007] The present application provides a shield body structure suitable for super-small vertical curve turning radius, comprising a cutter head, a variable-diameter pad block being detachably installed at the bottom of the cutter head, the variable-diameter pad block dividing the cutter head into a center block and four edge blocks, the variable-diameter pad block comprising four normal connecting blocks and four side connecting blocks, the four normal connecting blocks being detachably connected with the center block and the four edge blocks, and the four side connecting blocks being detachably connected with the four normal connecting blocks and the four edge blocks, a plurality of disc cutters being detachably installed at the bottom of the cutter head, and a plurality of edge scrapers being detachably installed at the side edges of the cutter head.

[0008] Further, the cutter head includes two diameters of 7.7 m and 9.2 m; the positive connecting block in the cutter head with a diameter of 9.2 m is detachably connected with the center block and the edge block, the surface of the center block is provided with two symmetrical first grooves, the upper surface of the positive connecting block is provided with a second groove, the lower surface of the edge block is fixedly installed with a first protrusion, the first protrusion is movably inserted into the second groove, the lower surface of the positive connecting block is fixedly installed with a second protrusion, and the second protrusion is movably inserted into the first groove.

[0009] Further, the first groove and the second groove are both fixedly installed with symmetrical first springs, the top end of the first spring is fixedly connected with a pad, the first protrusion and the second protrusion are movably attached to the pad, the first groove and the second groove are both slidably connected with a clamping block, the surface of the first protrusion and the second protrusion is provided with a clamping groove, and the clamping block is movably inserted into the clamping groove.

[0010] Further, the first groove and the second groove are both provided with a sliding groove, the sliding groove is slidably connected with a pull rod, one end of the pull rod is fixedly connected with the clamping block, the other end of the pull rod penetrates through the first groove and the second groove and extends to the outside, the sliding groove is slidably connected with a limiting ring, the surface of the limiting ring is fixedly installed with a second spring, the pull rod penetrates through the inside of the second spring, a containing groove is formed on the side close to the sliding groove, and the clamping block is slidably connected in the containing groove.

[0011] Further, the surface of the positive connecting block is provided with symmetrical T-shaped grooves, one side of the surface of the side connecting block is fixedly installed with a T-shaped block, the T-shaped block is movably inserted into the T-shaped groove, the other side of the surface of the side connecting block is fixedly installed with an insertion block, the surface of the positive connecting block is provided with symmetrical insertion holes, the insertion block is movably inserted into the insertion hole, the surface of the insertion block and the surface of the positive connecting block are both provided with threaded holes, and the threaded holes are threadedly connected with bolts.

[0012] Further, after the variable-diameter pad block is removed from the cutter head with a diameter of 7.7 m, the four first protrusions on the surface of the four edge blocks are movably inserted into the four first grooves on the surface of the center block, after the variable-diameter pad block is removed, the edge scrapers are removed at the connection positions of the two edge blocks of the variable-diameter pad block, and the diameters of the remaining edge scrapers are adjusted for closed processing.

[0013] Further, the cutter head is small-range variable-diameter through the variable-diameter pad block, the small-range variable-diameter is from a diameter of 9.2 m to a diameter of 8.7 m, and the cutter head is large-range variable-diameter through the edge block, and the large-range variable-diameter is from a diameter of 8.7 m to a diameter of 7.7 m.

[0014] Further, the rolling cutter is arranged in a ring shape at the bottom of the cutter head, five groups of ring-shaped rolling cutters are arranged on the cutter head with a diameter of 9.2 m, and four groups of ring-shaped rolling cutters are arranged on the cutter head with a diameter of 7.7 m.

[0015] Further, the side scraper is detachably mounted in a ring shape on the side of the cutter head, two side blocks are fixedly mounted with side scrapers, ten groups of side scrapers are fixedly mounted on the side of the cutter head with a diameter of 9.2 m, and eight groups of side scrapers are fixedly mounted on the side of the cutter head with a diameter of 7.7 m.

[0016] Further, the material of the rolling cutter and the side scraper is high-strength alloy material.

[0017] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0018] (1) The cutter head in the present application adopts a block type structure design, and the main bearing is configured according to the maximum variable-diameter cutter head load condition. For different diameters of the chamber, the initial excavation diameter of the cutter head is unchanged. According to the variable-diameter requirement of the cutter head during the construction process, different sizes of variable-diameter blocks are configured to realize the variable-diameter of the cutter head from 0 to 1.5 m, and meet the variable-diameter requirement of the cutter head with multiple excavation diameters.

[0019] (2) When the diameter of the cutter head is adjusted, the first protrusion in the side block is connected with the first groove and the second groove respectively, so that the diameter of the cutter head can be adjusted from 9.2 m to 7.7 m. After the first protrusion is inserted into the first groove or the second groove, the lower surface of the first protrusion extrudes the clamping block to make the clamping block recover to the inside of the accommodating groove. When the surface clamping groove of the first protrusion is at the same horizontal plane as the clamping block, the clamping block is inserted into the clamping groove under the action of the second spring, thereby limiting the first protrusion. The cutter head is convenient to disassemble and assemble, and the working efficiency is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the exemplary embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor. In the drawings:

[0021] Fig. 1 is a cutter head structure diagram of the present application with a diameter of 9.2 m;

[0022] Fig. 2 is a cutter head cross-sectional structure diagram of the present application;

[0023] Fig. 3 is a cutter head structure diagram of the present application with a diameter of 7.7 m;

[0024] Fig. 4 Fig. 2 is a schematic view of the structure of the cutter head A according to the present application;

[0025] Fig. 5 Fig. 3 is a structural view of the side connecting block of the cutter head according to the present application;

[0026] Fig. 6 Fig. 4 is a structural view of the positive connecting block cutter head according to the present application.

[0027] The marks in the drawings and the corresponding names of the parts are as follows:

[0028] 1, cutter head; 11, center block; 111, first recess; 112, first spring; 113, pad; 114, pull rod; 115, clamping block; 116, sliding groove; 117, limiting ring; 118, second spring; 119, accommodating groove; 12, side block; 121, first protrusion; 122, clamping groove;

[0029] 2, variable-diameter pad block; 21, positive connecting block; 211, second recess; 212, second protrusion; 213, threaded hole; 214, insertion hole; 215, T-shaped groove; 22, side connecting block; 221, T-shaped block; 222, insertion block; 223, bolt; 3, hob; 4, side scraper. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts are within the scope of protection of the present application.

[0032] It should be noted that: similar marks and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0033] In the description of the present application, it is also necessary to explain that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Embodiment 1

[0035] As Figs. 1-6 shown, the embodiment provides a shield structure suitable for ultra-small vertical curve turning radius, which comprises a cutter head 1, the cutter head 1 performs guide well and slag removal work, a variable diameter pad 2 is detachably installed at the bottom of the cutter head 1, the disassembly of the variable diameter pad 2 realizes the change of the diameter of the cutter head 1, the variable diameter pad 2 divides the cutter head 1 into a center block 11 and four edge blocks 12, the variable diameter pad 2 comprises four normal connecting blocks 21 and four side connecting blocks 22, the recombination and disassembly of the center block 11 and the four edge blocks 12 are realized through the cooperation of the normal connecting blocks 21 and the side connecting blocks 22, the four normal connecting blocks 21 are detachably connected with the center block 11 and the four edge blocks 12, the four side connecting blocks 22 are respectively detachably connected with the four normal connecting blocks 21 and the four edge blocks 12, a plurality of hobbing cutters 3 are detachably installed at the bottom of the cutter head 1, a plurality of edge scrapers 4 are detachably installed on the side wall of the cutter head 1, and the hobbing cutters 3 and the edge scrapers 4 cooperate to perform rock breaking work inside the guide well.

[0036] Specifically, the cutter head 1 is provided with two diameters of 7.7m and 9.2m, the normal connecting blocks 21 in the cutter head 1 with a diameter of 9.2m are respectively detachably connected with the center block 11 and the edge block 12, the surface of the center block 11 is provided with two symmetrical groups of first grooves 111, the upper surface of the normal connecting block 21 is provided with a second groove 211, the lower surface of the edge block 12 is fixedly installed with a first protrusion 121, the first protrusion 121 is movably inserted into the second groove 211, and the lower surface of the normal connecting block 21 is fixedly installed with a second protrusion 212, and the second protrusion 212 is movably inserted into the first groove 111.

[0037] In the embodiment of the present application, the first protrusion 121 and the second protrusion 212 are connected with the first groove 111 and the second groove 211 respectively, so that the cutter head 1 can form an integral whole, and it is more convenient to disassemble.

[0038] Specifically, symmetrical first springs 112 are fixedly installed inside the first groove 111 and the second groove 211. A pad 113 is fixedly connected to the top of the first spring 112. The first protrusion 121 and the second protrusion 212 are movably fitted with the pad 113. A locking block 115 is slidably connected inside the first groove 111 and the second groove 211. A slot 122 is opened on the surface of the first protrusion 121 and the second protrusion 212. The locking block 115 is movably inserted into the slot 122.

[0039] In this embodiment of the invention, the pad 113 supports the first protrusion 121 and the second protrusion 212. After the first protrusion 121 and the second protrusion 212 are inserted into the first groove 111 or the second groove 211, the lower surface of the first protrusion 121 presses the locking block 115 to retract the locking block 115 into the receiving groove 119. When the locking groove 122 on the surface of the first protrusion 121 and the locking block 115 are on the same horizontal plane, the locking block 115 is inserted into the locking groove 122 under the action of the second spring 118, thereby limiting the first protrusion 121 and the second protrusion 212.

[0040] Specifically, both the first groove 111 and the second groove 211 have sliding grooves 116 inside. A pull rod 114 is slidably connected inside the sliding groove 116. One end of the pull rod 114 is fixedly connected to the locking block 115, and the other end of the pull rod 114 passes through the first groove 111 and the second groove 211 and extends to the outside. A limit ring 117 is slidably connected inside the sliding groove 116. A second spring 118 is fixedly installed on the surface of the limit ring 117. The pull rod 114 passes through the interior of the second spring 118. A receiving groove 119 is provided on the side near the sliding groove 116, and the locking block 115 is slidably connected inside the receiving groove 119.

[0041] In this embodiment of the invention, after being squeezed by the first protrusion 121 and the second protrusion 212, the card block 115 retracts into the receiving groove 119. When the card block 115 and the card groove 122 are on the same horizontal plane, the card block 115 is inserted into the card groove 122 to limit and fix the first protrusion 121 and the second protrusion 212 under the cooperation of the second spring 118 and the limiting ring 117.

[0042] Specifically, the surface of the positive connecting block 21 has symmetrical T-slots 215, and a T-block 221 is fixedly installed on one side of the surface of the side connecting block 22. The T-block 221 is movably inserted into the T-slot 215. A plug 222 is fixedly installed on the other side of the surface of the side connecting block 22. The surface of the positive connecting block 21 has symmetrical insertion holes 214, and the plug 222 is movably inserted into the insertion holes 214. Both the surface of the plug 222 and the surface of the positive connecting block 21 have threaded holes 213, and bolts 223 are threadedly connected inside the threaded holes 213.

[0043] In this embodiment of the invention, the connection between the side connecting block 22 and the front connecting block 21 is made more stable by inserting the T-shaped block 221 into the T-shaped groove 215. After the insert block 222 is inserted into the insertion hole 214, the connection between the side connecting block 22 and the front connecting block 21 is fixed a second time by tightening the bolt 223.

[0044] Specifically, the variable diameter pad 2 is removed from the cutter head 1 with a diameter of 7.7m. The first protrusion 121 on the surface of the four side blocks 12 is movably inserted into the four first grooves 111 on the surface of the center block 11. After the variable diameter pad 2 is removed, the side scraper 4 is removed at the connection between the variable diameter pad 2 and the two side blocks 12, and the diameter of the remaining side scrapers 4 is adjusted for sealing.

[0045] In this embodiment of the invention, in the cutter head 1 with a diameter of 7.7m, the first protrusion 121 is inserted into the first groove 111, and the connection between the two side blocks 12 is sealed.

[0046] Specifically, the cutter head 1 undergoes a small-range diameter change via the diameter-changing pad 2, with the diameter range being 9.2m to 8.7m and 0 to 0.5m. The cutter head 1 also undergoes a large-range diameter change via the side block 12, with the diameter range being 8.7m to 7.7m and 0.6 to 1.5m.

[0047] In this embodiment of the invention, the purpose of ultra-small vertical curve turning is achieved by changing the diameter of the cutter head 1.

[0048] Specifically, the hobs 3 are arranged in a ring at the bottom of the cutter head 1. Five sets of ring hobs 3 are arranged at the bottom of the cutter head 1 with a diameter of 9.2m, and four sets of ring hobs are arranged at the bottom of the cutter head 1 with a diameter of 7.7m.

[0049] In this embodiment of the invention, the roller cutter 3 is used for rock crushing, and the number of roller cutters 3 at the bottom of the cutter head 1 with different diameters is different.

[0050] Specifically, the side scraper 4 is detachably installed in a ring on the side of the cutter head 1. The side scraper 4 is fixedly installed on the surface of the two side blocks 12. Ten sets of side scrapers 4 are fixedly installed on the side of the cutter head 1 with a diameter of 9.2m, and eight sets of side scrapers 4 are fixedly installed on the side of the cutter head 1 with a diameter of 7.7m.

[0051] In this embodiment of the invention, the side scraper 4 works in conjunction with the roller cutter 3 to crush rocks, and the number of side scrapers 4 on the side of the cutter disc 1 with different diameters varies.

[0052] Specifically, the hobbing cutter 3 and the side scraper 4 are made of high-strength alloy material.

[0053] In this embodiment of the invention, the harder the material of the side scraper 4 and the roller cutter 3, the better the rock crushing effect.

[0054] For tunnels of different diameters, the initial excavation diameter of the cutterhead remains unchanged. Different sized variable diameter blocks are configured according to the diameter change requirements of the cutterhead during construction. When a diameter change is needed in the bottom guide shaft, the variable diameter pad 2 is disassembled, allowing one central block 11 and four side blocks 12 to be recombined. Diameters from 9.2m to 8.7m are achieved through a small-range diameter change using the variable diameter pad 2, while diameters from 8.7m to 7.7m are achieved through a large-range diameter change using the newly manufactured cutterhead side blocks 12, thus achieving a cutterhead diameter change from 0 to 1.5m. When a diameter change is needed in the middle guide shaft, a flat cutterhead and a conical cutterhead are used for slag removal. Diameters from 9.2m to 7.7m are achieved with a flat cutterhead, and diameter changes are achieved using the newly manufactured cutterhead side blocks 12. A diameter of 8.7m is achieved with a newly manufactured conical cutterhead, thereby meeting the diameter change requirements of various excavation diameters of the cutterhead.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A shield structure adapted to ultra-small vertical curve turning radius, comprising a cutterhead (1), characterized in that, The cutter head (1) is detachably equipped with a variable diameter pad (2) at the bottom. The variable diameter pad (2) divides the cutter head (1) into a central block (11) and four side blocks (12). The variable diameter pad (2) includes four positive connecting blocks (21) and four side connecting blocks (22). The four positive connecting blocks (21) are detachably connected to the central block (11) and the four side blocks (12). The four side connecting blocks (22) are detachably connected to the four positive connecting blocks (21) and the four side blocks (12) respectively. Multiple sets of roller cutters (3) are detachably installed at the bottom of the cutter head (1). Multiple sets of side scrapers (4) are detachably installed on the sides of the cutter head (1).

2. The shield structure adaptable to ultra-small vertical curve turning radius according to claim 1, characterized in that, The cutter head (1) includes two types with diameters of 7.7m and 9.2m. In the cutter head (1) with a diameter of 9.2m, the positive connecting block (21) is detachably connected to the center block (11) and the side block (12). The surface of the center block (11) is provided with two sets of symmetrical first grooves (111). The upper surface of the positive connecting block (21) is provided with a second groove (211). The lower surface of the side block (12) is fixedly installed with a first protrusion (121). The first protrusion (121) is movably inserted into the second groove (211). The lower surface of the positive connecting block (21) is fixedly installed with a second protrusion (212). The second protrusion (212) is movably inserted into the first groove (111).

3. A shield structure adaptable to ultra-small vertical curve turning radius according to claim 2, characterized in that, A symmetrical first spring (112) is fixedly installed inside both the first groove (111) and the second groove (211). A pad (113) is fixedly connected to the top of the first spring (112). The first protrusion (121) and the second protrusion (212) are movably fitted with the pad (113). A locking block (115) is slidably connected inside both the first groove (111) and the second groove (211). A locking groove (122) is opened on the surface of both the first protrusion (121) and the second protrusion (212). The locking block (115) is movably inserted into the locking groove (122).

4. A shield structure adaptable to ultra-small vertical curve turning radius according to claim 3, characterized in that, Both the first groove (111) and the second groove (211) have a sliding groove (116) inside. A pull rod (114) is slidably connected inside the sliding groove (116). One end of the pull rod (114) is fixedly connected to the locking block (115). The other end of the pull rod (114) passes through the first groove (111) and the second groove (211) and extends to the outside. A limiting ring (117) is slidably connected inside the sliding groove (116). A second spring (118) is fixedly installed on the surface of the limiting ring (117). The pull rod (114) passes through the interior of the second spring (118). A receiving groove (119) is opened near the side of the sliding groove (116). The locking block (115) is slidably connected inside the receiving groove (119).

5. A shield structure adaptable to ultra-small vertical curve turning radius according to claim 1, characterized in that, The surface of the positive connecting block (21) is provided with symmetrical T-slots (215). A T-block (221) is fixedly installed on one side of the surface of the side connecting block (22). The T-block (221) is movably inserted into the T-slot (215). A plug (222) is fixedly installed on the other side of the surface of the side connecting block (22). The surface of the positive connecting block (21) is provided with symmetrical insertion holes (214). The plug (222) is movably inserted into the insertion holes (214). The surfaces of the plug (222) and the positive connecting block (21) are both provided with threaded holes (213). A bolt (223) is threaded into the threaded hole (213).

6. A shield structure adaptable to ultra-small vertical curve turning radius according to claim 2, characterized in that, After removing the variable diameter pad (2) from the cutter head (1) with a diameter of 7.7m, the first protrusions (121) on the surface of the four side blocks (12) are movably inserted into the four first grooves (111) on the surface of the center block (11). After the variable diameter pad (2) is removed, the side scraper (4) is removed at the connection between the two side blocks of the variable diameter pad (2), and the diameter of the remaining side scrapers (4) is adjusted for sealing.

7. A shield structure adaptable to ultra-small vertical curve turning radius according to claim 1, characterized in that, The cutter head (1) has a small diameter change through the diameter changing pad (2), with the small diameter change ranging from 9.2m to 8.7m; the cutter head (1) has a large diameter change through the side block (12), with the large diameter change ranging from 8.7m to 7.7m.

8. A shield structure adaptable to ultra-small vertical curve turning radius according to claim 2, characterized in that, The hobbing cutter (3) is arranged in a ring at the bottom of the cutter head (1). The cutter head (1) with a diameter of 9.2m has five sets of ring hobbing cutters (3) at the bottom, and the cutter head (1) with a diameter of 7.7m has four sets of ring hobbing cutters (3) at the bottom.

9. A shield structure adaptable to ultra-small vertical curve turning radius according to claim 8, characterized in that, The side scraper (4) is detachably mounted in a ring on the side of the cutter head (1). The two side blocks (12) are fixedly mounted with the side scraper (4). Ten sets of side scrapers (4) are fixedly mounted on the side of the cutter head (1) with a diameter of 9.2m, and eight sets of side scrapers (4) are fixedly mounted on the side of the cutter head (1) with a diameter of 7.7m.

10. A shield structure adaptable to ultra-small vertical curve turning radius according to claim 9, characterized in that, Both the roller cutter (3) and the side scraper (4) are made of high-strength alloy material.

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