阅读说明：本技术 一种耙吸式挖泥船深挖耙头 (Deep digging drag head of trailing suction hopper dredger ) 是由 李朋 包丽丽 宋东明 于 2021-09-28 设计创作，主要内容包括：本发明公开了一种耙吸式挖泥船深挖耙头,包括刀具组件和耙头组件,刀具组件包括第一旋转轴和伸缩刀,第一旋转轴沿径向设置有第一轴槽,伸缩刀包括刀壳、刀体和调整件,刀体和调整件安装于刀壳内部,刀壳穿插于第一轴槽内；耙头组件,包括耙头底座、外壳、驱动件和传动件,外壳、驱动件和传动件设置于耙头底座上端,驱动件通过传动件与第一旋转轴配合。本发明可以根据泥土的种类自适应的调节齿刀的的长短,最大化的处理淤泥,使耙头可以更好的传送淤泥,提高耙吸式挖泥船的工作产量,解决因为土质的原因而无法工作的问题。(The invention discloses a deep-digging drag head of a trailing suction hopper dredger, which comprises a cutter assembly and a drag head assembly, wherein the cutter assembly comprises a first rotating shaft and a telescopic cutter, the first rotating shaft is provided with a first shaft groove along the radial direction, the telescopic cutter comprises a cutter shell, a cutter body and an adjusting piece, the cutter body and the adjusting piece are arranged in the cutter shell, and the cutter shell is inserted in the first shaft groove; rake head subassembly, including Rake head base, shell, driving piece and driving medium set up in Rake head base upper end, and the driving piece passes through driving medium and first rotation axis cooperation. The length of the serrated knife can be adjusted in a self-adaptive mode according to the types of soil, sludge is treated to the maximum extent, the drag head can better convey the sludge, the working yield of the trailing suction hopper dredger is improved, and the problem that the trailing suction hopper dredger cannot work due to soil quality is solved.)

1. A deep digging drag head of a trailing suction hopper dredger is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

the cutter assembly (100) comprises a first rotating shaft (101) and a telescopic cutter (102), wherein a first shaft groove (101 a) is formed in the first rotating shaft (101) in the radial direction, the telescopic cutter (102) comprises a cutter shell (102 a), a cutter body (102 b) and an adjusting piece (102 c), the cutter body (102 b) and the adjusting piece (102 c) are installed inside the cutter shell (102 a), and the cutter shell (102 a) is inserted into the first shaft groove (101 a);

drag head assembly (200) comprising a drag head base (201), a housing (202), a driving member (203) and a transmission member (204), wherein the housing (202), the driving member (203) and the transmission member (204) are arranged at an upper end of the drag head base (201), and the driving member (203) is engaged with the first rotation axis (101) through the transmission member (204).

2. The deep-cutting drag head of a trailing suction hopper dredger according to claim 1, wherein: the cutter comprises a cutter shell (102 a), wherein a cutter body groove (102 a-1) and an extrusion rod groove (102 a-2) are formed in the upper end of the cutter shell (102 a), a cavity (102 a-3) is formed in the cutter shell (102 a), an extrusion rod (102 b-1) is arranged on the side face of the cutter body (102 b), the extrusion rod (102 b-1) is inserted into the extrusion rod groove (102 a-2), and the cutter body (102 b) penetrates through the cavity (102 a-3) and is matched with a main spring (105) to be inserted into the cutter body groove (102 a-1).

3. The deep-cutting drag head of a trailing suction hopper dredger according to claim 2, wherein: the cutter shell (102 a) is further internally provided with a limiting groove (102 a-4) and a limiting connecting groove (102 a-5), the adjusting piece (102 c) is installed in the limiting groove (102 a-4), the side face of the adjusting piece (102 c) is connected with an auxiliary spring (106), and the auxiliary spring (106) is installed in the limiting connecting groove (102 a-5).

4. The deep-cutting drag head of a trailing suction hopper dredger according to claim 3, wherein: a cutter shell plate (102 a-6), a first cutter shell plate groove (102 a-7) and a second cutter shell plate groove (102 a-8) are further arranged in the cutter shell (102 a), and the first cutter shell plate groove (102 a-7) and the second cutter shell plate groove (102 a-8) are arranged on the side surface of the cutter shell plate (102 a-6);

the side surface of the adjusting piece (102 c) is provided with a first limiting block (102 c-1) and a second limiting block (102 c-2), the first limiting block (102 c-1) is inserted into the first knife shell plate groove (102 a-7), and the second limiting block (102 c-2) is inserted into the second knife shell plate groove (102 a-8).

5. The deep-cutting drag head of a trailing suction hopper dredger according to claim 4, wherein: the side surface of the adjusting piece (102 c) is further provided with a limiting connecting block (102 c-3) and an elastic rubber tube (102 c-4), one end of the elastic rubber tube (102 c-4) is arranged inside the limiting connecting block (102 c-3), the side surface of the cutter body (102 b) is further provided with a cutter body connecting block (102 b-2), and the cutter body connecting block (102 b-2) is matched with the other end of the elastic rubber tube (102 c-4).

6. The deep-cutting drag head of a trailing suction hopper dredger according to claim 4 or 5, wherein: the cutter assembly (100) further comprises a second rotating shaft (103) and a breaking knife (104), a second shaft groove (103 a) is formed in the second rotating shaft (103) along the radial direction, and the breaking knife (104) is inserted into the second shaft groove (103 a).

7. The deep-cutting drag head of a trailing suction hopper dredger according to claim 6, wherein: the side surface of the drag head base (201) is provided with a first base hole (201 a) and a second base hole (201 b), the bottom of the drag head base is provided with a base groove (201 c), the first rotating shaft (101) is inserted into the first base hole (201 a), and the second rotating shaft (103) is inserted into the second base hole (201 b).

8. The deep-cutting drag head of a trailing suction hopper dredger according to claim 7, wherein: first driven wheels (101 b) are arranged at two ends of the first rotating shaft (101), second driven wheels (103 b) are arranged at two ends of the second rotating shaft (103), and the second driven wheels (103 b) are matched with the first driven wheels (101 b) through first belts (205).

9. The deep-cutting drag head of a trailing suction hopper dredger according to claim 8, wherein: third driven wheels (103 c) are further arranged at two ends of the second rotating shaft (103), a driving wheel (204 a) is arranged at one end of the transmission piece (204), and the driving wheel (204 a) is matched with the third driven wheels (103 c) through a second belt (206).

10. The deep-cutting drag head of a trailing suction hopper dredger according to claim 8 or 9, wherein: the transmission piece (204) is meshed with the driving piece (203) through a straight gear, and the driving piece (203) is meshed with the motor through a spur gear.

Technical Field

The invention relates to the technical field of dredging engineering, in particular to a deep-digging drag head of a trailing suction hopper dredger.

Background

In the dredging industry, a trailing suction hopper dredger is a large self-propelled, cabin-mounted dredger equipped with a drag head excavator and a hydraulic suction device. When the dredger is used for dredging, the rake suction pipe is placed to the water bottom, mud is absorbed from the water bottom through the rake head of the rake suction dredger and the mud suction pipe by utilizing the vacuum action of the mud pump and enters a mud bin of the dredger, and after the mud bin is full, the rake is lifted to sail to a mud throwing area for throwing mud.

The drag head of the drag suction dredger is the foremost end device of a pipeline for sucking mud or silt by the drag suction dredger, the drag head of the drag suction dredger is connected with a ship body through a drag arm, the drag arm can do up-and-down movement, the rear end of the drag arm is placed into the water to a certain depth, so that the drag head of the drag suction dredger is contacted with a dredging working surface of an underwater soil layer, therefore, the drag head of the drag suction dredger has direct influence on the dredging performance of the drag suction dredger, and the drag head of the drag suction dredger can basically work when the soil substrate is hard or the soil is too viscous.

Disclosure of Invention

In order to solve the technical problems, the invention provides the following technical scheme: a deep-digging drag head of a trailing suction hopper dredger comprises a cutter assembly, a cutter assembly and a telescopic cutter, wherein the first rotating shaft is provided with a first shaft groove along the radial direction, the telescopic cutter comprises a cutter shell, a cutter body and an adjusting piece, the cutter body and the adjusting piece are installed inside the cutter shell, and the cutter shell is inserted into the first shaft groove;

the drag head assembly comprises a drag head base, a shell, a driving piece and a transmission piece, wherein the shell, the driving piece and the transmission piece are arranged at the upper end of the drag head base, and the driving piece is matched with the first rotating shaft through the transmission piece.

As a preferable scheme of the deep-digging drag head of the trailing suction hopper dredger, a cutter body groove and an extrusion rod groove are formed in the upper end of the cutter shell, a cavity is formed in the cutter shell, an extrusion rod is arranged on the side surface of the cutter body, the extrusion rod is inserted in the extrusion rod groove, and the cutter body penetrates through the cavity and is matched with the main spring to be inserted in the cutter body groove.

As a preferable scheme of the deep-digging drag head of the trailing suction hopper dredger, the cutter housing is further internally provided with a limiting groove and a limiting connecting groove, the adjusting piece is installed in the limiting groove, the side surface of the adjusting piece is connected with the auxiliary spring, and the auxiliary spring is installed in the limiting connecting groove.

As a preferable scheme of the deep-digging drag head of the trailing suction hopper dredger, a blade shell plate, a first blade shell plate groove and a second blade shell plate groove are further arranged in the blade shell, and the first blade shell plate groove and the second blade shell plate groove are arranged on the side surface of the blade shell plate;

the side surface of the adjusting piece is provided with a first limiting block and a second limiting block, the first limiting block is inserted into the first knife shell groove, and the second limiting block is inserted into the second knife shell groove.

As a preferred scheme of the deep-digging drag head of the trailing suction hopper dredger, the side surface of the adjusting part is further provided with a limiting connecting block and an elastic rubber tube, one end of the elastic rubber tube is arranged inside the limiting connecting block, the side surface of the cutter body is further provided with a cutter body connecting block, and the cutter body connecting block is matched with the other end of the elastic rubber tube.

As a preferable scheme of the deep-digging drag head of the trailing suction hopper dredger, the cutter assembly further comprises a second rotating shaft and a breaking cutter, the second rotating shaft is provided with a second axial groove along the radial direction, and the breaking cutter is inserted into the second axial groove.

As a preferable scheme of the deep-digging drag head of the trailing suction hopper dredger, a first base hole and a second base hole are formed in the side surface of the drag head base, a base groove is formed in the bottom of the drag head base, the first rotating shaft is inserted into the first base hole, and the second rotating shaft is inserted into the second base hole.

As a preferable scheme of the deep-digging drag head of the trailing suction hopper dredger, first driven wheels are arranged at two ends of the first rotating shaft, second driven wheels are arranged at two ends of the second rotating shaft, and the second driven wheels are matched with the first driven wheels through a first belt.

As a preferable scheme of the deep-digging drag head of the trailing suction hopper dredger, third driven wheels are further arranged at two ends of the second rotating shaft, a driving wheel is arranged at one end of the driving part, and the driving wheel is matched with the third driven wheels through a second belt.

As a preferable scheme of the deep-digging drag head of the trailing suction hopper dredger, the transmission member is meshed with the driving member through a spur gear, and the driving member is meshed with the motor through the spur gear.

The invention has the beneficial effects that: the length of the serrated knife can be adjusted in a self-adaptive mode according to the types of soil, sludge is treated to the maximum degree, the drag head can better convey the sludge, the working yield of the trailing suction hopper dredger is improved, and the problem that the trailing suction hopper dredger cannot work due to the soil is solved.

Drawings

Fig. 1 is a schematic structural view of a deep-digging drag head assembly of a trailing suction hopper dredger.

Fig. 2 is a schematic view of an assembly structure of a deep-digging drag head of the trailing suction hopper dredger.

Fig. 3 is a schematic sectional view of a telescopic cutter in a deep-digging drag head of a trailing suction hopper dredger.

Fig. 4 is a schematic sectional view of the housing in the deep-digging drag head of the trailing suction hopper dredger.

Fig. 5 is a schematic structural section A in a sectional view of a deep-cutting drag head housing of the trailing suction hopper dredger.

Fig. 6 is a schematic view of the structure of the cutter body in the deep-digging drag head of the trailing suction hopper dredger.

FIG. 7 is a schematic sectional view of an adjusting member in a deep-cutting drag head of a trailing suction hopper dredger.

In the figure: a cutter assembly 100; a first rotating shaft 101; a first shaft groove 101 a; the first driven pulley 101 b; a telescopic knife 102; a cutter housing 102 a; a cutter body groove 102 a-1; the squeeze bar channel 102 a-2; chamber 102 a-3; a limiting groove 102 a-4; a limit connecting groove 102 a-5; the cartridge plate 102 a-6; a first cutter housing plate pocket 102 a-7; a second tool housing plate pocket 102 a-8; a restraint post 102 a-9; a cutter body connecting block 102 a-10; reflux drum 102 a-11; main flow channels 102 a-12; main check valves 102 a-13; secondary check valves 102 a-14; secondary flow channels 102 a-15; a blade body 102 b; the squeeze bar 102 b-1; a cutter body connecting block 102 b-2; a cutter body connecting block groove 102 b-3; a cutter body connecting rod 102 b-4; bumps 102 b-5; an adjustment member 102 c; the first stopper 102 c-1; a second stopper 102 c-2; a limit connection block 102 c-3; an elastic rubber tube 102 c-4; roller 102 c-5; rubber ring 102 c-6; a second rotation shaft 103; the second shaft groove 103 a; a second driven pulley 103 b; a third driven pulley 103 c; a breaking knife 104; a main spring 105; an auxiliary spring 106; the drag head assembly 200; a head base 201; a first base hole 201 a; a second base hole 201 b; a base groove 201 c; a housing 202; a driver 203; a transmission member 204; a drive wheel 204 a; a first belt 205; a second belt 206.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Example 1

Referring to fig. 1, 2, 3, 4 and 6, the present embodiment provides a deep-cutting drag head of a trailing suction hopper dredger, comprising a cutter assembly 100 and a drag head assembly 200.

The cutter assembly 100 comprises a first rotating shaft 101 and a telescopic cutter 102, wherein the first rotating shaft 101 is provided with a first shaft groove 101a along the radial direction, the telescopic cutter 102 comprises a cutter shell 102a, a cutter body 102b and an adjusting piece 102c, the cutter body 102b and the adjusting piece 102c are installed inside the cutter shell 102a, and the cutter shell 102a is inserted into the first shaft groove 101a through a cutter body connecting block 102a-10 in a bolt connection mode.

The drag head assembly 200 comprises a drag head base 201, a housing 202, a driving member 203 and a transmission member 204, wherein the housing 202, the driving member 203 and the transmission member 204 are arranged at the upper end of the drag head base 201.

The shell 202 can be installed on the drag head base 201 through bolted connection, and thus, later maintenance is facilitated, the driving part 203 and the transmission part 204 can be welded on the drag head base 201 through welding, and the driving part 203 is matched with the first rotating shaft 101 through the transmission part 204.

Specifically, a cutter body groove 102a-1 and an extrusion rod groove 102a-2 are arranged inside the upper end of the cutter shell 102a, a cavity 102a-3 is arranged inside the cutter shell 102a, an extrusion rod 102b-1 is arranged on the side surface of the cutter body 102b, the extrusion rod 102b-1 is inserted into the extrusion rod groove 102a-2, and the cutter body 102b penetrates through the cavity 102a-3 and is inserted into the cutter body groove 102a-1 in a matched manner with the main spring 105.

Preferably, at least two pressing rod grooves 102a-2 and pressing rods 102b-1 are provided, so that the cutter body is more stable.

Further, the cutter assembly 100 further includes a second rotating shaft 103 and a breaking blade 104, the second rotating shaft 103 is provided with a second axial slot 103a along the radial direction, and the breaking blade 104 is inserted into the second axial slot 103a, and the connection mode may be a bolt connection mode.

Preferably, the telescopic knife 102 and the crushing knife 104 are provided in plurality.

Specifically, the drag head base 201 has a first base hole 201a and a second base hole 201b on the side, and a base groove 201c on the bottom, the first rotating shaft 101 is inserted into the first base hole 201a, and the second rotating shaft 103 is inserted into the second base hole 201 b.

Further, first driven wheels 101b are provided at both ends of the first rotation shaft 101, second driven wheels 103b are provided at both ends of the second rotation shaft 103, and the second driven wheels 103b are engaged with the first driven wheels 101b through a first belt 205.

Specifically, third driven wheels 103c are further disposed at two ends of the second rotating shaft 103, a driving wheel 204a is disposed at one end of the transmission member 204, and the driving wheel 204a is engaged with the third driven wheels 103c through a second belt 206.

Further, the transmission member 204 is engaged with the driving member 203 through a spur gear, and the driving member 203 is engaged with the motor through a spur gear.

When the driving device is used, the motor is started, the motor drives the driving part 203 to rotate, the driving part 203 drives the transmission part 204 to rotate, and the transmission wheel 204a at one end of the transmission part 204 drives the third driven wheel 103c to rotate through the second belt 206.

The second driven wheel 103b on the second rotating shaft 103 drives the first driven wheel 101b to transmit through the first belt 205.

The harrow body is put into water to work and suck sludge, the sludge is transmitted to a dredger through a pipeline, the telescopic knife 102 is contacted with the sludge at the bottom of the water, if the soil is harder than the cutter body 102b, the cutter body 102b retracts into the shell 202, and the extrusion rod 102b-1 in the cutter body slides towards the inside of the extrusion rod groove 102 a-2. Therefore, the problem that the first rotating shaft 101 cannot rotate and the whole drag head cannot work due to the fact that the telescopic knife 102 cannot cut due to too hard soil is avoided.

When the sludge soil is not hard, the main spring 105 inside the blade body groove 102a-1 pushes the blade body 102b to extend and contract outward by a certain length, and the pressing rod 102b-1 slides in the pressing rod groove 102a-2 and plays a role of fixing the blade body 102 b.

The breaking blade 104 can further process the soil excavated by the telescopic blade 102 for secondary processing, so that the rake body can better absorb the sludge. The breaking knife 104 is preferably staggered with the telescopic knife 102, so that collision is avoided, and the breaking knife 104 can process viscous soil and other impurities on the telescopic knife 102.

Therefore, the telescopic knife 102 can achieve higher sludge suction effect of the drag head according to different types of soil and soil in different degrees of change in work.

Example 2

Referring to fig. 3, 4, 5 and 6, the present embodiment is different from the previous embodiment in that a backflow groove 102a-11, a main flow groove 102a-12 and a sub flow groove 102a-15, a main check valve 102a-13 and a sub check valve 102a-14 are further provided inside the upper end of the housing.

Specifically, the main flow channel 102a-12 and the sub flow channel 102a-15 are communicated with the squeeze bar channel 102a-2 and the return flow channel 102a-11, the squeeze bar 102b-1 is inserted into the squeeze bar channel 102a-2, and the squeeze bar channel 102a-2 and the return flow channel 102a-11 are filled with hydraulic oil.

Further, the main check valve 102a-13 is bolted to the main flow groove 102a-12, and the main check valve 102a-13 faces the squeeze rod groove 102a-2, so that the hydraulic oil in the squeeze rod groove 102a-2 cannot flow into the return groove 102a-11 through the main check valve 102 a-13.

Further, the sub check valves 102a-14 are installed on the sub flow grooves 102a-15 by bolts, and the sub check valves 102a-14 are opened toward the return grooves 102a-11, so that the hydraulic oil in the return grooves 102a-11 cannot flow into the squeeze rod grooves 102a-2 through the sub check valves 102 a-14.

Preferably, at least two main flow-through grooves 102a-12 are provided, which are provided at upper and lower ends of the return flow-through grooves 102a-11, and the main flow-through groove 102a-12 near one end of the notch of the squeeze bar groove 102a-2 is installed with the main check valve 102a-13, and the other end is not installed.

Preferably, at least two reflux tanks 102a-11 are provided.

Preferably, the notches of the secondary flow channels 102a-15 are provided with a small size so that the hydraulic oil flows slowly.

When the drag harrow is put into water, the telescopic cutter 102 contacts with sludge at the bottom of the water, if the cutter body 102b is pressed by hard soil, the cutter body 102b retracts into the shell 202, and the pressing rod 102b-1 in the cutter body slides towards the inside of the pressing rod groove 102 a-2.

At this time, the hydraulic oil at the upper end of the squeeze rod 102b-1 flows into the return tank 102a-11 through the main flow tank 102a-12, and the hydraulic oil in the return tank 102a-11 flows into the squeeze rod tank 102a-2 at the lower end of the squeeze rod 102b-1 through the main check valve 102 a-13.

When the sludge soil is not hard, the main spring 105 inside the cutter body groove 102a-1 pushes the cutter body 102b to extend and contract outwards for a certain length, and the pressing rod 102b-1 slides in the pressing rod groove 102a-2, so that the hydraulic oil can only flow into the return flow groove 102a-11 through the secondary check valve 102a-14 due to the setting position of the primary check valve 102a-13, and finally flows into the pressing rod groove 102a-2 through the primary flow groove 102a-12 without the primary check valve 102a-13, the hydraulic oil is located at the upper end of the pressing rod 102b-1, and the pressing rod 102b-1 descends slowly due to the small setting of the notch of the secondary flow groove 102a-15, thereby slowing the outward extension and contraction of the cutter body 102 b.

Because the telescopic knife 102 rotates along with the first rotating shaft 101, the knife body 102b is not always in a stressed state, and the knife body 102b is in water due to a gap, which causes the telescopic knife 102 to be rapidly and unnecessarily telescopic, and affects the service life of the telescopic knife.

Therefore, the existing cutter body 102b cannot rebound rapidly when being in water, the service life of the telescopic cutter 102 is prolonged, the rebound of the cutter body 102b is not too much, the resistance of the telescopic cutter 102 to be stretched again is reduced, and the rotating efficiency is improved.

Example 3

Referring to fig. 3, 4, 6 and 7, the present embodiment is different from the previous embodiment in the role of the adjuster 102 c.

Specifically, the inside of the knife housing 102a is further provided with a limiting groove 102a-4 and a limiting connecting groove 102a-5, the adjusting piece 102c is installed in the limiting groove 102a-4, the side surface of the adjusting piece 102c is connected with the auxiliary spring 106 in a welding manner, the auxiliary spring 106 is installed in the limiting connecting groove 102a-5, and the auxiliary spring 106 is connected with the connecting groove 102a-5 in a welding manner.

Further, a cutter shell plate 102a-6, a first cutter shell plate groove 102a-7 and a second cutter shell plate groove 102a-8 are further arranged in the cutter shell 102a, and the first cutter shell plate groove 102a-7 and the second cutter shell plate groove 102a-8 are arranged on the side surface of the cutter shell plate 102 a-6;

the side surface of the adjusting piece 102c is provided with a first stopper 102c-1 and a second stopper 102c-2, the first stopper 102c-1 is inserted into the first knife shell groove 102a-7, and the second stopper 102c-2 is inserted into the second knife shell groove 102 a-8.

Preferably, the rollers 102c-5 are respectively disposed inside the first stopper 102c-1 and the second stopper 102c-2, so as to be capable of moving in the grooves.

Specifically, the side surface of the adjusting piece 102c is further provided with a limiting connecting block 102c-3 and an elastic rubber tube 102c-4, one end of the elastic rubber tube 102c-4 is arranged inside the limiting connecting block 102c-3 in a mode that the elastic rubber tube 102c-4 is in thermal connection with the limiting connecting block 102 c-3.

Further, a cutter body connecting block 102b-2 is further arranged on the side face of the cutter body 102b, a cutter body connecting block groove 102b-3 is formed in the cutter body connecting block 102b-2, a cutter body connecting rod 102b-4 is arranged in the cutter body connecting block groove 102b-3, and the whole cutter body connecting block 102b-2 can be integrally formed or manufactured through single welding and cutting.

The other end of the elastic rubber tube 102c-4 is provided with a rubber ring 102c-6, and the cutter body connecting block 102b-2 is matched with the other end of the elastic rubber tube 102 c-4. The matching mode is that the cutter body connecting rod 102b-4 passes through the rubber ring 102c-6, the inside of the cutter shell 102a is also provided with a limiting column 102a-9, and a sliding roller is arranged on the limiting column 102 a-9.

Preferably, the side surface of the cutter body 102b is further provided with a bump 102b-5, and the bump 102b-5 is in clearance fit with the cutter housing plate 102c, so that the stability of the cutter body 102b in the telescopic process is ensured.

When the cutter body 102b is contracted when encountering hard soil, the elastic rubber tube 102c-4 is subjected to a pulling force, the adjusting piece 102c is pulled to move under the action of the limiting column 102a-9, the first limiting block 102c-1 and the second limiting block 102c-2 slide out of the first cutter housing plate groove 102a-7 and the second cutter housing plate groove 102a-8 respectively, and the lug 102b-5 is just positioned between the first limiting block 102c-1 and the second limiting block 102 c-2.

When the cutter body 102b is subjected to resistance and exceeds load, the convex block 102b-5 can touch the second limiting block 102c-2 to limit the cutter body 102b to continue to shrink, so that the damage to the interior of the cutter body 102b and the interior of the cutter shell 102a is avoided, and the stability and firmness of the whole device are ensured.

When the cutter body 102b is soft and has small stress when encountering soil and extends outwards, the tensile force borne by the elastic rubber tube 102c-4 disappears, the first limiting block 102c-1 and the second limiting block 102c-2 are pulled back by the auxiliary spring 106, the convex block 102b-5 cannot be blocked, and the cutter body 102b can extend normally.

It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.