Novel earth boring machine

By designing a new type of excavator with a transparent thread cylinder and a rotating cylinder structure, the problem that the existing equipment cannot quickly replace the spiral blades of different sizes can be solved, and the dust is reduced by spraying the water source, achieving the needs of different sizes and potholes. Improve the effect of air quality.

CN222396108UActive Publication Date: 2025-01-28YUNXI COUNTY LVFENG INTELLIGENT AGRI TECH CO LTD
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Patent Information

Application Number
CN202420758091.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-12
Publication Date
2025-01-28
Estimated Expiration
2034-04-12

AI Technical Summary

Technical Problem

Existing pit digging equipment cannot quickly replace spiral blades of different diameters, resulting in the inability to adapt to the pit holes of different sizes required for planting plants of different sizes. At the same time, a large amount of dust is generated during the pit digging process, which may lead to air pollution.

Method used

A new type of digging machine is designed with a transparent threaded barrel and rotating cylinder structure. The rapid replacement of different sizes of spiral blades is achieved through electric sliding and lifting mechanisms, and water sources are sprayed through the nozzle to reduce dust.

Benefits of technology

The spiral blades are quickly replaced according to the size of different plants to meet the needs of potholes in different sizes. At the same time, the soil and dust are avoided by spraying water sources, and the air quality is improved.

✦ Generated by Eureka AI based on patent content.

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Abstract

The novel earth boring machine comprises a machine box, a transverse plate is horizontally arranged at the upper end of the inner side wall of the machine box, the top of the transverse plate is rotationally connected with three threaded rods which are transversely distributed at equal intervals and all penetrate to the lower portion of the transverse plate, and the three threaded rods are all sleeved with threaded cylinders which are in transmission connection with the threaded rods; three threaded cylinders are arranged in the machine box, the three threaded cylinders are sleeved with rotating cylinders rotationally connected with the threaded cylinders, a limiting mechanism is arranged between the threaded cylinders and the machine box, a driving mechanism is arranged between the limiting mechanism and the rotating cylinders, and the three rotating cylinders are sequentially and fixedly sleeved with a first spiral blade, a second spiral blade and a third spiral blade from left to right; the blade diameters of the first spiral blade, the second spiral blade and the third spiral blade are gradually increased from left to right, a stretching-out opening is formed in the bottom of the machine box, and an electric sliding table is horizontally arranged at the upper end of the interior of the machine box. The novel hole digger has the advantages that sandy soil flying is eliminated, and holes with different sizes are dug.
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Description

Technical Field

[0001] The utility model relates to the technical field of plant planting, in particular to a novel pit digging machine. Background Art

[0002] Urban greening refers to the process of improving the urban environment, enhancing the quality of urban life, and protecting the ecological environment through the planting and management of vegetation, as well as the construction and utilization of green spaces in urban construction and urban planning. When it comes to urban greening, large-scale plant planting is crucial. Urban greening can improve the urban environment, improve people's quality of life, reduce the urban heat island effect, increase oxygen content, improve air quality, etc.

[0003] In the process of plant planting, it is often necessary to dig holes in the land for planting. The existing digging equipment is mainly composed of spiral blades, motors and height adjustment mechanisms. Its working principle is: the motor drives the spiral blades to rotate, and the height adjustment mechanism controls the spiral blades and the motor to move downward to realize the digging operation of the land. However, this equipment has some limitations. First, the spiral blades and the motor are usually fixedly connected, and spiral blades of different diameters cannot be quickly replaced to adapt to the different sizes of holes required for planting plants of different sizes. Secondly, during the digging process, the spiral blades will generate a large amount of dust diffusion, which may cause air pollution and bring potential risks to the health of surrounding residents and workers.

[0004] Therefore, a novel pit digging machine is proposed to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a novel pit digging machine to solve the above problems.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A novel pit digger comprises a chassis, wherein a horizontal plate is horizontally arranged at the upper end of the inner side wall of the chassis, wherein the top of the horizontal plate is rotatably connected with three threaded rods which are equidistantly distributed laterally and all penetrate to the bottom thereof, wherein the three threaded rods are sleeved with threaded cylinders which are transmission-connected thereto, wherein the three threaded cylinders are sleeved with rotating cylinders which are rotatably connected thereto, wherein a limiting mechanism is arranged between the threaded cylinder and the chassis, wherein a driving mechanism is arranged between the limiting mechanism and the rotating cylinder, wherein the three rotating cylinders are fixedly sleeved with spiral blades 1, 2, 3 and 4 in sequence from left to right The spiral blades are spiral blades one, two and three, and the diameters of the spiral blades one, two and three increase from left to right. A protruding port is provided at the bottom of the chassis, and an electric slide is provided at the upper horizontal end of the interior of the chassis. A motor one is provided at the moving end of the electric slide, and the output shaft of the motor one is coaxially connected with a hexagonal clamping shaft. A hexagonal clamping groove is provided on the top of the threaded rod, and a lifting mechanism is provided between the cross plate and the electric slide. A water pipe is provided at the bottom of the chassis, and a nozzle is provided on the water pipe.

[0008] Preferably, the limiting mechanism includes a concave frame and a limiting shaft, the upper end of the outer curved surface of the threaded cylinder is fixedly sleeved with a concave frame, the interior of the concave frame is provided with a limiting shaft with both ends passing through both sides thereof, and the two ends of the limiting shaft are respectively connected to the bottom of the horizontal plate and the inner wall of the chassis.

[0009] Preferably, the driving mechanism includes a second motor, a ring gear and a gear. A ring gear is fixedly mounted on the upper end of the outer curved surface of the rotating cylinder. The inner bottom wall of the concave frame is provided with a second motor having an output shaft extending therethrough. The output shaft of the second motor is provided with a gear meshing with the ring gear.

[0010] Preferably, the lifting mechanism includes a vertical rod, a strip plate and an electric push rod. Strip plates are horizontally provided on the front and rear sides of the electric slide. Vertical rods are provided on both sides below the strip plates, the upper ends of which pass through the tops of the strip plates and are connected to the inner top wall of the chassis. The lower ends of the vertical rods are connected to the top of the horizontal plates, and an electric push rod is provided between the horizontal plates and the strip plates.

[0011] Preferably, the water pipe includes water pipe one and water pipe two, water pipe two is provided on the right side of the chassis along the front-to-back direction, two water pipes two are provided on the bottom of the chassis located on the front and rear sides of the extension port, the right end of water pipe one extends upward and is connected to water pipe two, and the nozzle is provided on the opposite sides of the two water pipes one.

[0012] Preferably, casters are provided at the bottom of the chassis, and a handle is provided on the right side of the chassis.

[0013] Preferably, an adjustment opening located above the horizontal plate is opened on the front of the chassis.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: the water source is connected to the water pipe, and during the pit digging process, water will be sprayed from the nozzle thereon to the excavated soil, thereby avoiding the flying of sand and soil; the electric slide drives the motor 1 to move to the top of the threaded rod on the spiral blade of the required size, and drives the clamping shaft on the output shaft of the motor 1 to enter the clamping groove on the threaded rod through the lifting mechanism to complete the clamping connection between the clamping shaft and the threaded rod, and the motor 1 can drive the threaded rod to rotate through the clamping shaft, so that the threaded barrel on the threaded rod is transmitted thereto, and under the limit of the limit mechanism, the threaded barrel moves downward, and drives the driving mechanism, the spiral blade of the required size and the rotating barrel thereon to move downward, and the spiral blade of the required size and the rotating barrel thereon move downward and move out of the extension port, and in the process of moving downward, the driving mechanism drives the spiral blade of the required size and the rotating barrel thereon to rotate, so as to dig a pit in the land to obtain a pit of the required size. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings further illustrate the present invention, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model Figure 1 ;

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model Figure 2 ;

[0018] Figure 3 It is a sectional view of the three-dimensional structure of the utility model;

[0019] Figure 4 It is a three-dimensional schematic diagram of the local structure of the utility model;

[0020] Figure 5 It is a three-dimensional schematic diagram of the threaded rod, the threaded cylinder and the rotating cylinder of the utility model.

[0021] In the attached drawings: 1. chassis; 2. horizontal plate; 3. threaded rod; 4. threaded cylinder; 5. rotating cylinder; 6. limiting mechanism; 61. concave frame; 62. limiting shaft; 7. driving mechanism; 71. motor 2; 72. ring gear; 73. gear; 91. spiral blade 1; 92. spiral blade 2; 93. spiral blade 3; 10. extension port; 11. electric slide; 12. motor 1; 13. clamping shaft; 14. clamping slot; 15. lifting mechanism; 151. vertical rod; 152. strip plate; 153. electric push rod; 16. water pipe; 161. water pipe 1; 162. water pipe 2; 17. nozzle; 18. caster; 19. push handle; 20. adjustment port. DETAILED DESCRIPTION

[0022] The following describes the embodiments of the utility model in detail, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model. In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, and "several" means one or more, unless otherwise clearly and specifically defined.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0025] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0026] In this embodiment, Figure 1-5 A novel pit digger is provided. The utility model comprises a chassis 1. A horizontal plate 2 is horizontally arranged on the upper end of the inner side wall of the chassis 1. Three threaded rods 3 are rotatably connected to the top of the horizontal plate 2 and are evenly distributed in the horizontal direction and all penetrate to the bottom thereof. The three threaded rods 3 are sleeved with threaded cylinders 4 that are transmission-connected thereto. The three threaded cylinders 4 are sleeved with rotating cylinders 5 that are rotationally connected thereto. A limiting mechanism 6 is arranged between the threaded cylinders 4 and the chassis 1. A driving mechanism 7 is arranged between the limiting mechanism 6 and the rotating cylinders 5. The three rotating cylinders 5 are fixedly sleeved with spiral blades 1 91 and spiral blades 2 92 in sequence from left to right. And spiral blade three 93, the blade diameters of spiral blade one 91, spiral blade two 92 and spiral blade three 93 increase from left to right one by one, a projection port 10 is provided at the bottom of the chassis 1, an electric slide 11 is provided horizontally at the upper end of the interior of the chassis 1, a motor 12 is provided at the moving end of the electric slide 11, and the output shaft of the motor 12 is coaxially connected with a hexagonal clamping shaft 13, a hexagonal clamping groove 14 is provided at the top of the threaded rod 3, a lifting mechanism 15 is provided between the cross plate 2 and the electric slide 11, a water pipe 16 is provided at the bottom of the chassis 1, and a nozzle 17 is provided on the water pipe 16.

[0027] In this embodiment, the blade diameters of spiral blade 1 91, spiral blade 2 92 and spiral blade 3 93 are gradually increased, and a spiral blade of a desired size is selected according to the need to dig a pit of a desired size. The adjustment process is that the electric slide 11 drives the motor 12 to move to the top of the threaded rod 3 on the desired spiral blade, and drives the clamping shaft 13 on the output shaft of the motor 12 to enter the clamping groove 14 on the threaded rod 3 through the lifting mechanism 15 to complete the clamping connection between the clamping shaft 13 and the threaded rod 3, and the motor 12 can drive the threaded rod 3 to rotate through the clamping shaft 13, so that the threaded barrel 4 on the threaded rod 3 is transmitted thereto, and under the limit of the limit mechanism 6, the threaded barrel 4 moves downward, and drives the driving mechanism 7, the spiral blade of the desired size and the rotating barrel 5 thereon to move downward, and the spiral blade of the desired size and the rotating barrel 5 thereon move downward and move out of the extension port 10. During the downward movement, the driving mechanism 7 drives the spiral blades of the required size and the rotating cylinder 5 thereon to rotate, so as to dig a hole in the land to obtain a hole of the required size. At the same time, the water source is connected to the water pipe 16, and water will be sprayed from the nozzle 17 thereon to the excavated soil to prevent soil and dust from flying.

[0028] Preferably, as another embodiment of the utility model, the limiting mechanism 6 includes a concave frame 61 and a limiting shaft 62, the upper end fixed sleeve of the outer curved surface of the threaded cylinder 4 is provided with a concave frame 61, the interior of the concave frame 61 is provided with a limiting shaft 62 with two ends extending through both sides thereof, the two ends of the limiting shaft 62 are respectively connected to the bottom of the horizontal plate 2 and the inner wall of the chassis 1, the driving mechanism 7 includes a motor 2 71, a ring gear 72 and a gear 73, the upper end fixed sleeve of the outer curved surface of the rotating cylinder 5 is provided with a ring gear 72, the inner bottom wall of the concave frame 61 is provided with a motor 2 71 with an output shaft extending through the bottom thereof, and the output shaft of the motor 2 71 is provided with a gear 73 meshing with the ring gear 72.

[0029] In this embodiment, since the threaded barrel 4 is transmission-connected to the threaded rod 3, the threaded barrel 4 needs to be driven to move vertically by the threaded rod 3. During the transmission process, the concave frame 61 installed on the threaded barrel 4 cooperates with the limit shaft 62, so that the threaded barrel 4 can only be lifted vertically and cannot rotate, thereby limiting the rotation. During this process, the concave frame 61 connected to the threaded barrel 4 can only move vertically along the limit shaft 62, and the motor 2 71 on the concave frame 61 and the rotating barrel 5 on the threaded barrel 4 will move vertically accordingly. The motor 2 71 can drive the gear 73 to rotate and transmit to the ring gear 72 on the rotating barrel 5 to rotate the rotating barrel 5 and the spiral blades thereon.

[0030] Preferably, as another embodiment of the utility model, the lifting mechanism 15 includes a vertical rod 151, a strip plate 152 and an electric push rod 153. The front and rear sides of the electric slide 11 are both laterally provided with a strip plate 152. Both sides below the strip plate 152 are provided with vertical rods 151 whose upper ends penetrate to the top and are connected to the inner top wall of the chassis 1. The lower end of the vertical rod 151 is connected to the top of the horizontal plate 2, and an electric push rod 153 is provided between the horizontal plate 2 and the strip plate 152.

[0031] In this embodiment, when the clamping shaft 13 on the output shaft of the motor 12 corresponds to the clamping groove 14 on one of the threaded rods 3, the telescopic shaft of the electric push rod 153 is driven to contract, so as to drive the strip plate 152, the electric slide 11 and the clamping shaft 13 on the output shaft of the motor 12 to move downward, so that the clamping shaft 13 enters the clamping groove 14 on the threaded rod 3, thereby completing the clamping connection. At this time, the motor 12 outputs torque to drive the threaded rod 3 to rotate, wherein the cooperation between the vertical rod 151 and the strip plate 152 plays a guiding and anti-deviating role.

[0032] Preferably, as another embodiment of the utility model, the water pipe 16 includes a water pipe 1 161 and a water pipe 2 162. A water pipe 2 162 is provided on the right side of the chassis 1 along the front-to-back direction, and two water pipes 162 are provided on the bottom of the chassis 1 at the front and rear sides of the extension port 10. The right end of the water pipe 1 161 extends upward and is connected to the water pipe 2 162, and the nozzle 17 is provided on the opposite sides of the two water pipes 1 161.

[0033] In this embodiment, an interface is installed on the water pipe 162, which can be connected to the water source through a hose. After the water is transported, it will enter the water pipe 162 and enter the two water pipes 1 161 after diversion. The nozzles 17 on the two water pipes 1 161 are sprayed onto the pit in the middle to improve the uniformity and effect of the spraying, so as to effectively prevent sand from flying.

[0034] Preferably, as another embodiment of the utility model, casters 18 are provided at the bottom of the chassis 1, and the number of casters 18 is four. The setting of four casters 18 can better disperse the weight and help maintain balance, and the casters 18 provide the device with a mobile function. A push handle is provided on the right side of the chassis 1 for workers to hold and push the device to move. An adjustment port 20 located above the horizontal plate 2 is provided on the front of the chassis 1 to facilitate workers to rotate the card shaft 13 to correspond to the shape of the corresponding card slot 14.

[0035] Working principle: the water source is connected to the joint on the water pipe 2 162 through a hose to complete the dredging of the water source. The electric slide 11 drives the motor 12 to move to the top of the threaded rod 3 on the spiral blade of the required size, and drives the electric push rod 153 to drive the strip plate 152, the electric slide 11 and the card shaft 13 on the output shaft of the motor 12 to move downward, so that the card shaft 13 enters the card groove 14 on the threaded rod 3. At this time, the motor 12 can drive the threaded rod 3 to rotate, so that the threaded rod 3 and the threaded cylinder 4 thereon are transmitted, and under the limitation of the concave frame 61 and the limiting shaft 62, the threaded cylinder 4 is moved downward, and the motor 2 71, the ring gear 72, the gear 73, the spiral blade of the required size and the rotating cylinder 5 thereon are driven downward, and the spiral blade of the required size and the rotating cylinder 5 thereon move downward and move out of the extension port 10. During the downward movement, the motor 2 71 drives the gear 73 to rotate and transmits with the ring gear 72 on the rotating cylinder 5 to rotate the rotating cylinder 5 and the spiral blades thereon, and digs the land with the depth of downward movement to obtain a pit of the required size. At the same time, the water source is turned on, and water will be sprayed onto the excavated soil from the nozzles 17 on the water pipe 1 161 on both sides to prevent sand and dust from flying.

[0036] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment", "certain embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0037] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementations of the present invention without creative work, and these equivalent variations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A novel pit digging machine, comprising a chassis (1), characterized in that: A horizontal plate (2) is horizontally provided at the upper end of the inner side wall of the chassis (1); the top of the horizontal plate (2) is rotatably connected to three threaded rods (3) which are equidistantly distributed laterally and extend through the bottom thereof; the three threaded rods (3) are sleeved with threaded cylinders (4) which are transmission-connected thereto; the three threaded cylinders (4) are sleeved with rotating cylinders (5) which are rotatably connected thereto; a limiting mechanism (6) is provided between the threaded cylinders (4) and the chassis (1); a driving mechanism (7) is provided between the limiting mechanism (6) and the rotating cylinders (5); the three rotating cylinders (5) are fixedly sleeved with spiral blades 1 (91), 2 (92) and 3 (93) in sequence from left to right; the spiral blades 1 are sleeved with spiral blades 2 (92) and 3 (93) respectively ... (91), the blade diameters of the spiral blade 2 (92) and the spiral blade 3 (93) increase from left to right, the bottom of the chassis (1) is provided with a projection opening (10), the upper end of the interior of the chassis (1) is provided with an electric slide (11), the moving end of the electric slide (11) is provided with a motor 1 (12), the output shaft of the motor 1 (12) is coaxially connected with a hexagonal clamping shaft (13), the top of the threaded rod (3) is provided with a hexagonal clamping groove (14), a lifting mechanism (15) is provided between the horizontal plate (2) and the electric slide (11), the bottom of the chassis (1) is provided with a water pipe (16), and the water pipe (16) is provided with a nozzle (17).

2. A new type of pit digging machine according to claim 1, characterized in that: The limiting mechanism (6) comprises a concave frame (61) and a limiting shaft (62); the upper end of the outer curved surface of the threaded tube (4) is fixedly sleeved with the concave frame (61); the interior of the concave frame (61) is provided with a limiting shaft (62) with two ends penetrating through both sides thereof; the two ends of the limiting shaft (62) are respectively connected to the bottom of the horizontal plate (2) and the inner wall of the chassis (1).

3. A new type of pit digging machine according to claim 2, characterized in that: The driving mechanism (7) comprises a second motor (71), a ring gear (72) and a gear (73); the upper end fixed sleeve of the outer curved surface of the rotating cylinder (5) is provided with a ring gear (72); the inner bottom wall of the concave frame (61) is provided with a second motor (71) with an output shaft extending therethrough; the output shaft of the second motor (71) is provided with a gear (73) meshing with the ring gear (72).

4. A new type of pit digging machine according to claim 1, characterized in that: The lifting mechanism (15) comprises a vertical rod (151), a strip plate (152) and an electric push rod (153); the strip plates (152) are both horizontally arranged on the front and rear sides of the electric slide (11); the upper ends of the strip plates (152) extending above the strip plates and connected to the inner top wall of the chassis (1) are both arranged on the two sides below the strip plates (152); the lower ends of the vertical rods (151) are connected to the top of the horizontal plate (2); and the electric push rod (153) is arranged between the horizontal plate (2) and the strip plates (152).

5. A new type of pit digging machine according to claim 1, characterized in that: The water pipe (16) comprises a first water pipe (161) and a second water pipe (162). The second water pipe (162) is provided on the right side of the chassis (1) along the front-to-back direction. The bottom of the chassis (1) is provided with two second water pipes (162) located on the front and rear sides of the extension opening (10). The right end of the first water pipe (161) extends upward and is connected to the second water pipe (162). The nozzle (17) is provided on opposite sides of the two first water pipes (161).

6. A new type of pit digging machine according to claim 1, characterized in that: The bottom of the chassis (1) is provided with casters (18), and the right side of the chassis (1) is provided with a handle.

7. A new type of pit digging machine according to claim 1, characterized in that: The front side of the chassis (1) is provided with an adjustment opening (20) located above the horizontal plate (2).