Water pipeline laying trenching device and trenching method

Abstract

The application discloses a water conservancy pipeline laying slotting device and a slotting method, relates to the field of water conservancy pipeline laying, and comprises a rack, wherein the rack is connected with a front suspension and a rear suspension; the front suspension is connected with a soil crushing mechanism; and the rear suspension is connected with a soil removing mechanism. The soil crushing mechanism comprises a soil crushing rotating shaft which is rotationally connected to the suspension; the soil crushing rotating shaft is radially fixed and axially slidably connected with a soil crushing wheel; the soil crushing wheel is connected with a first horizontal pushing mechanism which is fixed on the suspension at both sides; the suspension is rotationally connected to the rack; and the suspension is connected with the rack through a first pressing mechanism. Under the action of the first horizontal pushing mechanism, the soil crushing wheel axially slides relative to the soil crushing rotating shaft, so that the soil crushing wheel can move along a direction perpendicular to the slot to be formed, and the rack moves along the direction of the slot to be formed, so that the soil crushing wheel moves along an S-shaped path. The slotting width is determined by the first horizontal pushing mechanism, and the slotting depth is determined by the first pressing mechanism. Different width and depth grooves can be formed, and the device is suitable for laying different types of water conservancy pipelines.

Description

TECHNICAL FIELD

[0001] The application relates to the field of water pipeline laying, in particular to a water pipeline laying trenching device and a trenching method. BACKGROUND

[0002] In water pipeline laying, the pipeline is usually buried underground, that is, a pipeline pre-buried groove is first formed on the ground by a trenching device, the pipeline is placed in the groove, and then the soil is covered, so that the pipeline is protected and kept warm. In the prior art, the trenching is performed by an excavator, or a specific trenching device is used.

[0003] For example, the application file with the patent number CN111877432A discloses a cement pipeline laying trenching device, which is used to solve the problem of low efficiency of manual trenching in the prior art. The device comprises a power mechanism, the power mechanism comprises a main body and an engine, and the engine is provided with a power wheel; a trenching mechanism, the trenching mechanism comprises a support ring, a bucket, a spiral feeder and a pair of supporting arms; a plurality of discharge ports are arranged on the support ring, the bucket has a plurality of portions and is fixed to the outer side of the support ring, the spiral feeder comprises a driving shaft, a spiral blade and a material cylinder, the driving shaft and the support ring are fixed through a connecting frame, and only one side of the support ring is provided with the connecting frame, the driving shaft is further installed on the one end supporting arm through a bearing, the material cylinder and one of the supporting arms are fixed, the material cylinder and the fixed end of the supporting arm are provided with a discharge port, and a transmission wheel is arranged on the driving shaft; and an adjusting mechanism is arranged for adjusting the trenching depth of the trenching mechanism.

[0004] For another example, the application file with the patent number CN111941511A discloses a plastic pipeline pre-buried groove cutting device, which comprises an outer shell, a handle is fixedly arranged on the upper end of the outer shell, wheel shaft connecting plates are fixedly arranged on the left and right ends of the outer shell, traveling wheel shafts are rotatably arranged on the ends of the wheel shaft connecting plates away from the outer shell, traveling wheels are fixedly arranged on the traveling wheel shafts, an outer shell cavity is arranged in the outer shell, the opening of the outer shell cavity faces downward, bottom plate sliding grooves are arranged on the left and right sides of the outer shell cavity, the two bottom plate sliding grooves are arranged in the left and right side walls of the outer shell cavity respectively, the built-in cutting device can cut and groove hard building materials, water mist is sprayed at the same time of cutting to prevent the cutting tool from overheating and dust from flying, a smashing device is arranged in the device to smash cement or bricks for subsequent processing, and a removing device is arranged to remove the building materials cut in the groove to form a groove for laying plastic pipelines.

[0005] However, the structure width of the existing pipeline laying trenching device for trenching is fixed, so that the trenching width is fixed, and the trenching parts need to be replaced for pipeline laying of different diameters. SUMMARY

[0006] The application aims to provide a water pipeline laying trenching device and trenching method to solve the problems in the background art.

[0007] To achieve the above object, the application provides the following technical scheme.

[0008] The water pipeline laying trenching device comprises a rack, a front suspension and a rear suspension connected to the rack, a soil crushing mechanism connected to the front suspension, and a soil removing mechanism connected to the rear suspension.

[0009] Preferably, the soil crushing wheel comprises two identical wheel discs connected by a compression spring, and the wheel discs are provided with crushing teeth on the side surfaces and fixedly connected with a cutter rod penetrating through the corresponding wheel disc on the opposite side.

[0010] Preferably, the outer side of the rotating disc is fixedly connected with a bearing inner ring, the outer side of the bearing inner ring is connected with a bearing outer ring, and the bearing inner ring and the bearing outer ring are connected with a roller therebetween.

[0011] Preferably, the first horizontal pushing mechanism comprises a first horizontal pushing rod fixedly connected with the bearing outer ring, and the first horizontal pushing rod is fixedly connected with a first horizontal pushing piston sliding in the first horizontal pushing cylinder.

[0012] Preferably, the first downward pressing mechanism comprises a downward pressing cylinder rotatingly connected to the rack, and the piston rod of the downward pressing cylinder is rotatingly connected with the front suspension.

[0013] Preferably, the rear suspension is rotationally connected with the frame, a soil removing rotating shaft is rotationally connected on the rear suspension, a soil removing wheel is axially slidably connected on the soil removing rotating shaft, the soil removing wheel is axially slidable relative to the soil removing rotating shaft and can be removed from the soil breaking wheel.

[0014] Preferably, the soil removing wheel comprises a sleeve axially slidably connected with the soil removing rotating shaft, a limiting sleeve is fixedly connected on both sides of the sleeve, a baffle is slidably connected on the sleeve, a ring array of soil buckets is fixedly connected on the side surface of the sleeve, a through hole is formed on the baffle for the soil bucket to pass through, the sleeve is connected with the soil bucket and the baffle is slidably connected on the sleeve and slides relative to the soil bucket, in the sliding process of the sleeve, the baffle can make the soil gather on one side of the baffle, facilitating the collection of the soil bucket.

[0015] Preferably, the sleeve is connected with the second horizontal pushing mechanism, the second horizontal pushing mechanism comprises a second horizontal pushing rod fixedly connected with the sleeve, the second horizontal pushing rod is fixed with a second horizontal pushing piston which is slidably arranged in a second horizontal pushing cylinder, the second horizontal pushing cylinder is fixed on the rear suspension, the connection between the sleeve and the second horizontal pushing mechanism enables the sleeve to slide relative to the soil removing rotating shaft, so that the soil bucket moves with the soil breaking wheel to remove the soil.

[0016] Preferably, the frame is connected with the wheel frame through the lifting cylinder, the wheel frame is rotationally connected with the driving wheel, the anti-skid rods are arranged in a ring array with the center of the axis of the driving wheel as the center and are fixedly connected on both sides of the driving wheel, the anti-skid rods are rotationally connected on the side surface of the driving wheel, the driving wheel is connected with the anti-skid rods on both sides, so that the soil breaking wheel and the soil removing wheel are relatively stable relative to the ground in the running state.

[0017] A trenching method of a water pipeline laying trenching device, in the process of advancing of the frame, the soil breaking mechanism first breaks the soil, and the soil breaking mechanism removes the broken soil to form a pipeline laying groove through the soil removing mechanism, in the process of soil breaking, the soil breaking wheel is axially slidably controlled relative to the soil breaking rotating shaft through the horizontal pushing mechanism, and at the same time, the frame moves along the pipeline laying line, so that a pipeline groove with a certain width can be opened in the moving process, and the limit moving distance of the horizontal pushing mechanism is controlled according to the required opening width.

[0018] Compared with the prior art, the trenching device has the following beneficial effects:

[0019] 1. The suspension is rotationally connected with the frame, the first downward pressing mechanism is used to change the horizontal height of the suspension to control the trenching depth, the soil breaking wheel is axially slidably connected on the soil breaking rotating shaft, and the first horizontal pushing mechanism is used to control the horizontal movement of the soil breaking wheel to change the trenching width, so that the trenching depth and width can be changed according to the diameter of the pipeline to be laid.

[0020] 2. The soil breaking wheel is formed by two disc plates which are oppositely slidably arranged, the cutter bars are fixedly connected on the side surfaces of the disc plates, in the advancing state, the cutter bars cut the soil on the front side to break the soil, in the horizontal movement, the cutter bars cut the soil on the opposite side of the disc plates to break the soil, and the lateral soil breaking is controlled by the first horizontal moving mechanism.

[0021] 3、The soil removing mechanism is a soil removing wheel connected to the rear suspension, which also adopts the axial sliding mode with the soil crushing shaft, and the soil crushing mechanism removes the crushed soil from the trench from the rear;

[0022] 4、The soil removing wheel adopts a soil bucket connected to the shaft sleeve and penetrating the baffle plate, which is driven to rotate by the soil removing shaft to remove the crushed soil, and the shaft sleeve is controlled to move horizontally by the second horizontal pushing mechanism, so that the baffle plate is located at the opposite end of the moving direction of the shaft sleeve under the soil resistance during the operation of the soil removing mechanism, so that the soil is concentrated on one side of the soil bucket of the baffle plate, facilitating collection;

[0023] 5、The frame is connected to the wheel frame through the lifting cylinder, and when passing through a non-planar section, the length of the lifting cylinder is adjusted to keep the frame relatively horizontal, so that the soil crushing wheel and the soil removing wheel are kept vertical to the ground, avoiding the inclination of the trench. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 is a structural schematic diagram of the present application;

[0025] Fig. 2 is a connection schematic diagram of the front suspension and the soil crushing mechanism of the present application;

[0026] Fig. 3 is a structural schematic diagram of the wheel disc of the present application;

[0027] Fig. 4 is a connection schematic diagram of the rear suspension and the soil removing mechanism of the present application;

[0028] Fig. 5 is a connection schematic diagram of the shaft sleeve and the soil bucket of the present application;

[0029] Fig. 6 is a structural schematic diagram of the baffle plate of the present application;

[0030] Fig. 7 is a structural schematic diagram of the wheel frame of the present application;

[0031] In the figure: 1, frame; 11, suspension shaft; 2, front suspension; 21, down pressure cylinder; 3, soil crushing mechanism; 31, soil crushing shaft; 32, soil crushing wheel; 321, wheel disc; 3211, crushing tooth; 3212, cutter bar; 322, compression spring; 4, rear suspension; 5, soil removing mechanism; 51, soil removing shaft; 52, shaft sleeve; 521, limiting sleeve; 53, soil bucket; 54, baffle plate; 541, inclined plate; 542, through hole; 6, first horizontal pushing mechanism; 61, first horizontal pushing cylinder; 62, first horizontal pushing rod; 7, second horizontal pushing mechanism; 71, second horizontal pushing cylinder; 8, lifting cylinder; 9, wheel frame; 91, driving wheel; 92, anti-skid rod. DETAILED DESCRIPTION

[0032] Example 1

[0033] As Figs. 1-3 shown, a water pipeline laying trenching device, comprising a rack 1, the rack 1 is connected with a front suspension 2 and a rear suspension 4, the front suspension 2 is connected with a soil crushing mechanism 3, the rear suspension 4 is connected with a soil removing mechanism 5, the soil crushing mechanism 3 comprises a soil crushing shaft 31 rotatably connected with the suspension, the soil crushing shaft 31 is radially fixed and axially slidably connected with a soil crushing wheel 32, the soil crushing wheel 32 is connected with a first horizontal pushing mechanism 6 fixed on the suspension on both sides, the suspension is rotatably connected with the rack 1, and the suspension is connected with the rack 1 through a first pressing mechanism; the soil crushing wheel 32 comprises two identical wheel discs 321, the two wheel discs 321 are connected through compression springs 322, the wheel disc 321 is provided with a crushing tooth 3211 on the side, and the two wheel discs 321 are respectively fixedly connected with a cutter bar 3212 penetrating through the corresponding wheel disc 321 on the opposite side; a bearing inner ring is fixedly connected outside the rotating disc, a bearing outer ring is connected outside the bearing inner ring, a roller is connected between the bearing inner ring and the bearing outer ring, and the bearing outer ring is fixedly connected with the first horizontal pushing mechanism 6; the first horizontal pushing mechanism 6 comprises a first horizontal pushing rod 62 fixedly connected with the bearing outer ring, and the first horizontal pushing rod 62 is fixedly connected with a first horizontal pushing piston slidably arranged in a first horizontal pushing cylinder 61; the first pressing mechanism comprises a pressing cylinder 21 rotatably connected with the rack 1, and a piston rod of the pressing cylinder 21 is rotatably connected with the front suspension 2.

[0034] When the device is used to open a pipeline trench, a power equipment is connected with the rack 1, the power equipment is in transmission connection with the soil crushing shaft 31, the soil crushing shaft 31 can be driven to rotate, a hydraulic system is connected with each cylinder on the rack 1, the soil crushing wheel 32 is axially slidably connected with the soil crushing shaft 31, the soil crushing shaft 31 is rotatably connected with the front suspension 2, the front suspension 2 is rotatably connected with a suspension shaft 11 fixed on the rack 1, the middle part of the front suspension 2 is rotatably connected with the piston rod of the pressing cylinder 21, and the top end of the pressing cylinder 21 is rotatably connected with the rack 1. When the pressing cylinder 21 operates, the front suspension 2 can be driven to rotate relative to the rack 1, so that the soil crushing shaft 31 rotatably connected with the bottom end of the front suspension 2 and the soil crushing wheel can be lifted. In the trenching work, the front suspension 2 is controlled to be gradually pressed, so that the soil crushing wheel 32 can be deeply inserted into the ground to a certain depth, the included angle between the suspension and the rack 1 is controlled, so that the limit depth is controlled, and when the depth reaches, the soil crushing wheel 32 travels along the trench direction at the current depth, and the soil in the trench is crushed, so that the soil removing mechanism 5 can clean up.

[0035] The broken wheel is divided into two wheel plates 321 which are symmetrically inserted, each wheel plate 321 is fixedly connected with a cutter rod 3212 penetrating the wheel plate 321 on the opposite side, the wheel plate 321 is fixedly connected with a flat key in the center, the flat key is matched with a flat key groove on the soil breaking shaft 31, so that the soil breaking shaft 31 and the soil breaking wheel 32 are radially fixed and axially relatively slidable, the opposite sides of the two wheel plates 321 are fixedly connected with bearing inner rings in the shaft sleeve 52, the bearing inner rings and the bearing outer rings are radially rotatable and axially fixed, the bearing outer rings are fixedly connected with the horizontal push rod, the horizontal push rod slides in the first horizontal push cylinder 61, under the condition that the soil breaking wheel 32 rotates, the bearing inner rings rotate, the bearing outer rings are relatively fixed with the suspension, when it is needed to extend the soil breaking wheel 32 to one side to increase the width of the trench, one of the first horizontal push cylinders 61 in the first horizontal push mechanism 6 is controlled to drive the wheel plate 321 to axially slide relative to the soil breaking shaft 31, at this time, the other wheel plate 321 is relatively stationary under the soil resistance, so that the side cutter rod 3212 of the driven horizontal moving wheel plate 321 extends to the side of the other wheel plate 321, the soil on the side of the wheel plate 321 is cut, the lateral extension is realized, the trench width is changed, with the forward movement of the machine frame 1, the soil breaking wheel 32 repeatedly moves horizontally relative to the soil breaking shaft 31 under the driving of the two first horizontal push cylinders 61, so that the soil breaking wheel 32 passes through the "S" shaped track, and a trench with a certain width is formed.

[0036] Compression springs 322 are arranged between the two wheel plates 321, so that under the pressure of one wheel plate 321 on the other wheel plate 321, the pressure is transmitted by the spring, so as to avoid that the soil breaking wheel 32 extends to the side of the trench with excessive pressure due to the pressure of the first horizontal moving cylinder, so that the side soil is compacted and difficult to break, it should be noted that under the pressure of the first horizontal push cylinder 61 on one side, the other horizontal push cylinder connected with the other wheel plate 321 is in a natural state, the cutter rod 3212 is arranged in the form of an arc-shaped blade, when the cutter rod 3212 rotates with the wheel plate 321, the soil is cut within a certain range, in order to ensure that the front suspension 2 still maintains transmission with the power equipment on the machine frame 1 after the rotation of the machine frame 1, the power equipment adopts a hydraulic drive mode, that is, the soil breaking shaft 31 is driven by a hydraulic driving part, which can always maintain transmission connection within a certain displacement range.

[0037] Embodiment 2

[0038] As Figs. 1-6As shown, a water pipeline laying trenching device, comprising a rack 1, the rack 1 is connected with a front suspension 2 and a rear suspension 4, the front suspension 2 is connected with a soil crushing mechanism 3, the rear suspension 4 is connected with a soil removing mechanism 5, the soil crushing mechanism 3 comprises a soil crushing shaft 31 rotatably connected with the suspension, the soil crushing shaft 31 is radially fixed and axially slidably connected with a soil crushing wheel 32, the soil crushing wheel 32 is connected with a first horizontal pushing mechanism 6 fixed on the suspension on both sides, the suspension is rotatably connected with the rack 1, and the suspension is connected with the rack 1 through a first pressing mechanism; the first pressing mechanism comprises a pressing hydraulic cylinder 21 rotatably connected with the rack 1, and a piston rod of the pressing hydraulic cylinder 21 is rotatably connected with the front suspension 2; the rear suspension 4 is rotatably connected with the rack 1, a soil removing shaft 51 is rotatably connected with the rear suspension 4, and a soil removing wheel is axially slidably connected with the soil removing shaft 51; the soil removing wheel comprises a shaft sleeve 52 axially slidably connected with the soil removing shaft 51, limit sleeves 521 are fixedly connected on both sides of the shaft sleeve 52, a baffle disc 54 is slidably connected with the shaft sleeve 52, and a plurality of soil hoppers 53 in annular array are fixedly connected with the shaft sleeve 52; a through hole 542 is arranged on the baffle disc 54 for the soil hoppers 53 to pass through; the shaft sleeve 52 is connected with a second horizontal pushing mechanism 7, the second horizontal pushing mechanism 7 comprises a second horizontal pushing rod fixedly connected with the shaft sleeve 52, and the second horizontal pushing rod is fixed with a second horizontal pushing piston slidably arranged in a second horizontal pushing hydraulic cylinder 71, and the second horizontal pushing hydraulic cylinder 71 is fixed on the rear suspension 4.

[0039] The rear suspension 4 is the same as the front suspension 2 and is driven to rotate by the pressing hydraulic cylinder 21, so that the soil removing mechanism 5 falls and removes the crushed soil, in the removing process, the soil removing shaft 51 rotatably connected with the rear suspension 4 is also connected with a hydraulic driving device on the rack 1 in a hydraulic driving mode, the soil removing shaft 51 gradually penetrates into the trench, a flat key is fixedly connected with the inner side of the shaft sleeve 52, the flat key in the shaft sleeve 52 is matched with a flat key groove on the side of the soil crushing shaft 31 to realize radial fixation, and the soil hoppers 53 fixedly connected with the shaft sleeve 52 are carried and rotated to the soil hoppers 53 in the trench in the rotating process of the shaft sleeve 52, the soil in the trench falls under the action of gravity when the soil hoppers 53 are opened downward, and the falling soil slides along the inclined plates 541 on the side of the baffle disc 54 to the side of the trench, meanwhile, the second horizontal pushing hydraulic cylinder 71 pushes the shaft sleeve 52 to slide relative to the soil removing shaft 51, so that the trench extends laterally, the baffle disc 54 blocks the soil on the opposite side, pushes the soil falling on one side of the trench, and gradually extends the width of the trench, the trajectory of the soil removing wheel is the same as that of the soil crushing wheel 32, and the depths of the soil crushing wheel 32 and the soil removing wheel penetrating into the soil are lower than the height of the soil crushing shaft 31 and the soil removing shaft 51.

[0040] Example 3

[0041] As Figs. 1-7As shown, a water pipeline laying trenching device, including frame 1, frame 1 is connected with front suspension 2, rear suspension 4, front suspension 2 is connected with soil crushing mechanism 3, rear suspension 4 is connected with soil removing mechanism 5, soil crushing mechanism 3 includes soil crushing shaft 31 rotatably connected with suspension, soil crushing shaft 31 is radially fixed with soil crushing wheel 32, axially slidingly connected, soil crushing wheel 32 is connected with first horizontal pushing mechanism 6 fixed on both sides of suspension, suspension is rotatably connected with frame 1, suspension is connected with frame 1 through first pressing mechanism; Frame 1 is connected with wheel frame 9 through lifting cylinder 8, wheel frame 9 is rotatably connected with driving wheel 91, anti-skid rod 92 is fixedly connected with driving wheel 91 on both sides of driving wheel 91, anti-skid rod 92 is limitingly rotatably connected with the side of driving wheel 91.

[0042] Driving wheel 91 is connected with driving structure on frame 1, when trenching in the position where the ground is relatively uneven, lifting cylinder 8 controls the distance between the top of frame 1 and the ground to make frame 1 keep relatively balanced, so that soil crushing wheel 32 and soil removing wheel keep vertical and straight line movement, avoiding the inclination of soil crushing wheel 32 and soil removing wheel to cause the inclination of trench, anti-skid rod 92 in annular array is rotatably connected with the side of driving wheel 91, anti-skid rod 92 is connected with anti-skid plate at outer end, anti-skid rod 92 is rotatably connected with the side of driving wheel 91 through torsion spring at inner end, which can offset the reaction force of soil on frame 1 due to the operation of soil crushing wheel 32 to a certain extent, reduce the possibility of sliding, and make frame 1 keep stable movement.

Claims

1. A trenching device for water pipeline installation, characterised in that: The utility model relates to a soil breaking mechanism, including frame (1), frame (1) is connected front suspension (2), rear suspension (4), front suspension (2) is connected soil breaking mechanism (3), rear suspension (4) is connected soil removing mechanism (5), soil breaking mechanism (3) includes rotationally connected on front suspension (2) soil breaking rotation axis (31), soil breaking rotation axis (31) and soil breaking wheel (32) radial fixed, axial sliding connection, soil breaking wheel (32) both sides with the first horizontal pushing mechanism (6) of fixed connection of front suspension (2), front suspension (2) is rotationally connected on frame (1), and front suspension (2) is connected with frame (1) through first down mechanism, The soil breaking wheel (32) includes two identical wheel discs (321), the two wheel discs (321) are connected by compression springs (322), the wheel disc (321) side is provided with a broken tooth (3211), and the two wheel discs (321) are respectively fixedly connected with the cutter bars (3212) penetrating the corresponding wheel discs (321) on the opposite sides. The wheel disc (321) is fixedly connected with a bearing inner ring outside, a bearing outer ring is connected outside the bearing inner ring, and a roller is connected between the bearing inner ring and the bearing outer ring. The first horizontal pushing mechanism (6) includes a first horizontal pushing rod (62) fixedly connected with the bearing outer ring, and the first horizontal pushing rod (62) is fixedly connected with a first horizontal pushing piston sliding in a first horizontal pushing cylinder (61).

2. A water pipeline trenching device according to claim 1, wherein: The first down mechanism includes a down cylinder (21) rotationally connected with the frame (1), and a piston rod of the down cylinder (21) is rotationally connected with the front suspension (2).

3. The water pipeline laying and grooving apparatus according to claim 1, characterized in that: The rear suspension (4) is rotationally connected with the frame (1), and a soil removing rotation axis (51) is rotationally connected with the rear suspension (4), and a soil removing wheel is axially and slidingly connected with the soil removing rotation axis (51).

4. A water pipeline trenching device according to claim 3, wherein: The soil removing wheel includes a shaft sleeve (52) axially and slidingly connected with the soil removing rotation axis (51), limit sleeves (521) are respectively fixedly connected with the shaft sleeve (52) on both sides, a baffle disc (54) is slidingly connected with the shaft sleeve (52), and annularly arranged soil hoppers (53) are fixedly connected with the shaft sleeve (52) on the side surface.

5. A water pipeline trenching device as claimed in claim 4, wherein: The shaft sleeve (52) is connected with a second horizontal pushing mechanism (7), the second horizontal pushing mechanism (7) includes a second horizontal pushing rod fixedly connected with the shaft sleeve (52), the second horizontal pushing rod is fixed with a second horizontal pushing piston sliding in a second horizontal pushing cylinder (71), and the second horizontal pushing cylinder (71) is fixed on the rear suspension (4).

6. A water pipeline trenching device according to claim 1, wherein: The frame (1) is connected with a wheel frame (9) through a lifting cylinder (8), the wheel frame (9) is rotationally connected with a driving wheel (91), anti-skid rods (92) are respectively fixedly connected with the driving wheel (91) on both sides and arranged in an annular array with the axis of the driving wheel (91) as the center, and the anti-skid rods (92) are rotationally connected with the side surface of the driving wheel (91) in a limiting mode.

7. The trenching method of any one of claims 1-6, wherein: During the movement of the frame (1), the soil breaking mechanism (3) first breaks the soil, and the broken soil is removed by the soil removing mechanism (5) to form a pipeline laying groove. During the soil breaking process, the soil breaking wheel (32) is controlled to slide axially relative to the soil breaking shaft (31) by the horizontal pushing mechanism, and at the same time, the frame (1) moves along the pipeline laying line, so that a pipeline groove with a certain width can be opened during the movement. The limit moving distance of the horizontal pushing mechanism is controlled according to the required opening width.

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