Soft ground garbage collecting device

By introducing an adjustable-angle shovel and vibrating screen structure into the soft ground waste collection device, combined with a lifting component and a motor-driven crank, connecting rod, and rotating rod mechanism, the problems of incomplete waste collection and difficult mud and sand separation on soft ground are solved, achieving efficient waste collection and mud and sand separation.

CN224148612UActive Publication Date: 2026-04-21ZHEJIANG UNIV CITY COLLEGE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-07
Publication Date
2026-04-21

AI Technical Summary

Technical Problem

Traditional waste collection devices struggle to collect waste thoroughly on soft surfaces and cannot effectively separate mud and sand from garbage, resulting in low collection efficiency and complex operation.

Method used

It adopts an adjustable-angle shovel and vibrating screen structure, combined with a lifting component and a motor-driven crank, connecting rod, and rotating rod mechanism to achieve effective shoveling of garbage and separation of mud and sand. By adjusting the angle of the shovel and the height of the vibrating screen, it can meet the needs of different ground conditions and garbage collection.

Benefits of technology

The system enables efficient collection of waste and separation of sediment on soft surfaces, reducing the workload of subsequent processing and improving waste collection efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a soft ground garbage collecting device which comprises a vehicle frame, universal wheels are arranged at the bottom of the vehicle frame, a shovel plate is rotatably connected to the front end of the vehicle frame, a first fixing plate is arranged on the upper side face of the vehicle frame, a lifting assembly is arranged on the first fixing plate, and a second fixing plate is connected to the lifting end of the lifting assembly. Mounting rods are arranged on the two sides of the bottom face of the second fixing plate correspondingly, the rear ends of the mounting rods are rotationally connected with a pair of rotating rod mechanisms, and connecting rod mechanisms are arranged at the front ends of the mounting rods. A vibrating screen is arranged between the rotating rod mechanism and the connecting rod mechanism; a first driving motor is arranged on the second fixing plate, a crank mechanism is connected to an output shaft of the first driving motor, and the crank mechanism is connected with the connecting rod mechanism. According to the utility model, silt separation operation can be realized on a soft surface, garbage collection is facilitated, and the garbage collection efficiency is improved.
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Description

Technical Field

[0001] This utility model belongs to the field of sanitation equipment technology, and in particular relates to a garbage collection device for soft ground. Background Technology

[0002] Collecting garbage on soft surfaces (such as sand and mud) presents numerous challenges. Traditional garbage collection devices may work well on hard surfaces (such as concrete and asphalt), but on soft surfaces, the looseness of the ground can lead to incomplete garbage collection and operational complexities. Some existing garbage collection devices lack specific optimizations for soft surfaces and cannot separate sand and mud from garbage, resulting in low garbage collection efficiency and inconvenient sand and mud separation operations. Utility Model Content

[0003] The purpose of this invention is to provide a waste collection device for soft ground. This invention enables the separation of mud and sand on soft ground, facilitating waste collection and improving waste collection efficiency.

[0004] The technical solution of this utility model is as follows: A soft ground garbage collection device includes a frame, with casters at the bottom of the frame, a shovel plate rotatably connected to the front end of the frame, a first fixing plate on the upper side of the frame, a lifting assembly on the first fixing plate, and a second fixing plate connected to the lifting end of the lifting assembly; mounting rods are respectively provided on both sides of the bottom surface of the second fixing plate, a pair of rotating rod mechanisms are rotatably connected to the rear end of the mounting rods, and a connecting rod mechanism is provided at the front end of the mounting rods; a vibrating screen is provided between the rotating rod mechanism and the connecting rod mechanism; a first drive motor is provided on the second fixing plate, and a crank mechanism is connected to the output shaft of the first drive motor, and the crank mechanism is connected to the connecting rod mechanism.

[0005] In the aforementioned soft ground garbage collection device, the front end of the vehicle frame is provided with a sliding groove, and a first rotating connector is slidably connected to the sliding groove; the front end of the first rotating connector is rotatably fitted with a second rotating connector and a third rotating connector; the second rotating connector is provided with a positioning groove, and the third rotating connector is provided with a positioning post embedded in the positioning groove; the end of the second rotating connector is fixedly connected to the shovel plate.

[0006] In the aforementioned soft ground garbage collection device, the first rotating connector is provided with a plurality of positioning holes surrounding the rotating shaft, and the third rotating connector is provided with a plurality of positioning protrusions that cooperate with the positioning holes.

[0007] In the aforementioned soft ground waste collection device, the lifting assembly includes a second drive motor, a drive screw connecting seat, multiple first optical axis connecting seats, and a second optical axis connecting seat that cooperates with the first optical axis connecting seats; the second drive motor and the first optical axis connecting seats are disposed on the upper side of the first fixed plate; the drive screw connecting seat and the second optical axis connecting seat are disposed on the upper side of the second fixed plate; a driven optical axis sleeved in the second optical axis connecting seat is fixed on the first optical axis connecting seat, and an active screw sleeved in the drive screw connecting seat is connected to the output end of the second drive motor.

[0008] In the aforementioned soft ground waste collection device, the crank mechanism includes a crank connected to the output shaft of a first drive motor, a first connecting rod rotatably connected to the outer surface of the crank, and a first rotating rod rotatably connected to the end of the first connecting rod.

[0009] In the aforementioned soft ground garbage collection device, the first connecting rod is provided with a plurality of first rotating holes and second rotating holes, the crank is provided with a plurality of third rotating holes in a cross shape around the axis, which cooperate with the first rotating holes, and the first rotating rod cooperates with the second rotating holes.

[0010] In the aforementioned soft ground waste collection device, the linkage mechanism includes a set of second connecting rods rotatably connected to both ends of a first rotating rod. A first limiting member is fixed on the first rotating rod and installed inside the second connecting rod. A second rotating rod is fixed between the same set of mounting rods. The second rotating rod is rotatably connected to the second connecting rod. A second limiting member is fixed on the second rotating rod and installed between the second connecting rod and the mounting rod. A third rotating rod passes through the front end of the vibrating screen. The end of the second connecting rod is rotatably connected to the third rotating rod. A third limiting member is fixed on the third rotating rod and installed between the second connecting rod and the vibrating screen.

[0011] In the aforementioned soft ground waste collection device, the rotating rod mechanism includes a fourth rotating rod passing through the rear end of the mounting rod, with a set of third connecting rods rotatably connected to both ends of the fourth rotating rod, and a fourth limiting member fixed on the fourth rotating rod and installed inside the third connecting rod; a fifth rotating rod passing through the rear end of the vibrating screen, the fifth rotating rod being rotatably connected to the end of the third connecting rod, and a fifth limiting member fixed on the fifth rotating rod and installed between the third connecting rod and the vibrating screen.

[0012] In the aforementioned soft ground waste collection device, the mounting rod is slidably connected to the vehicle frame.

[0013] In the aforementioned soft ground garbage collection device, the vibrating screen is provided with multiple inclined surfaces, and multiple sets of sand unloading holes are provided on the inclined surfaces.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This invention combines an adjustable-angle shovel and a vibrating screen structure to effectively collect garbage on soft surfaces. The shovel angle can be adjusted according to ground conditions to smoothly scoop up garbage, while the vibrating screen removes mud and sand from the garbage, ensuring that only garbage is collected, reducing subsequent workload and improving collection efficiency. The design of the connection between the first drive motor, crank mechanism, connecting rod mechanism, and rotating rod mechanism and the vibrating screen enables stable vibration of the screen, converting the rotational motion of the first drive motor into the reciprocating motion of the vibrating screen. The lifting assembly allows for the raising and lowering of the second fixed plate, thereby adjusting the height of components such as the vibrating screen. This facilitates reasonable adjustments based on the thickness of the garbage or the condition of the soft ground, improving the applicability of the device. Furthermore, the shovel angle can be precisely adjusted through first, second, and third rotating connectors to meet different garbage collection needs. Attached Figure Description

[0016] Figure 1 This is the front view of this utility model;

[0017] Figure 2 This is a top view of the present invention;

[0018] Figure 3 This is a structural view of the first rotating connector, the second rotating connector, and the third rotating connector of this utility model;

[0019] Figure 4 This is a partial view B of the present invention;

[0020] Figure 5 This is a partial structural view of the present invention;

[0021] Figure 6 This is a partial view A of the present invention.

[0022] The labels in the attached diagram are as follows: 1. Chassis; 101. Slide groove; 2. Shovel plate; 3. First fixed plate; 4. Mounting rod; 5. Second fixed plate; 6. Lifting assembly; 601. Drive screw connecting seat; 602. First optical shaft connecting seat; 603. Second optical shaft connecting seat; 604. Driven optical shaft; 605. Drive screw; 7. Vibrating screen; 701. Sand discharge hole; 8. First drive motor; 9. Crank mechanism; 901. Crank; 902. First connecting rod; 903. First rotating rod; 904. First rotating hole; 905. Second rotating hole; 906. Third rotating hole; 10. Linkage mechanism; 1001. Two-bar linkage; 1002, second rotating rod; 1003, third rotating rod; 1004, first limiting member; 1005, second limiting member; 1006, third limiting member; 11, rotating rod mechanism; 1101, fourth rotating rod; 1102, fifth rotating rod; 1103, fourth limiting member; 1104, fifth limiting member; 1105, third connecting rod; 12, first rotating connecting member; 1201, positioning hole; 13, second rotating connecting member; 1301, positioning groove; 14, third rotating connecting member; 1401, positioning post; 1402, positioning protrusion; 15, second drive motor; 16, caster wheel. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0024] Example: A waste collection device for soft ground, such as Figure 1As shown, the device includes a frame 1 with casters 16 at the bottom. A shovel 2 is rotatably connected to the front end of the frame 1 for scooping up garbage on soft surfaces. Due to the special characteristics of soft ground, the shovel 2 can adjust its angle according to the ground conditions to smoothly scoop up the garbage for subsequent processing. A first fixing plate 3 is provided on the upper side of the frame 1, and a lifting assembly 6 is provided on the first fixing plate 3. The lifting end of the lifting assembly 6 is connected to a second fixing plate 5. Mounting rods 4 are provided on both sides of the bottom surface of the second fixing plate 5, and the mounting rods 4 are slidably connected to the frame 1. This device can achieve its own lifting and lowering through the lifting assembly 6, thereby adjusting the height of components such as the vibrating screen 7. This helps to make reasonable adjustments according to the thickness of the garbage or the condition of the soft ground, improving the applicability of the device. A pair of rotating rod mechanisms 11 are rotatably connected to the rear end of the mounting rod 4, and a connecting rod mechanism 10 is provided at the front end of the mounting rod 4. A vibrating screen 7 is provided between the rotating rod mechanism 11 and the connecting rod mechanism 10. The vibrating screen 7 has multiple inclined surfaces, and multiple sets of sand discharge holes 701 are provided on the inclined surfaces. A first drive motor 8 is mounted on the second fixed plate 5. A crank mechanism 9 is connected to the output shaft of the first drive motor 8, and the crank mechanism 9 is connected to the connecting rod mechanism 10. This device converts the rotational motion of the first drive motor 8 into the reciprocating motion of the vibrating screen 7 through the crank mechanism 9, the connecting rod mechanism 10, and the rotating rod mechanism 11. During operation, the vibrating screen 7 vibrates through the drive of the crank mechanism 9, the connecting rod mechanism 10, and the rotating rod mechanism 11, removing mud and sand from the garbage scooped up by the shovel plate 2. This ensures that the collected garbage is mainly garbage, reducing the workload of subsequent processing and improving the efficiency of garbage collection.

[0025] Specifically, such as Figure 2 As shown, the front end of the frame 1 is provided with a sliding groove 101, and a first rotating connector 12 is slidably connected to the sliding groove 101; a second rotating connector 13 and a third rotating connector 14 are rotatably engaged at the front end of the first rotating connector 12. Figure 3As shown, the second rotating connector 13 is provided with a positioning groove 1301, and the third rotating connector 14 is provided with a positioning post 1401 embedded in the positioning groove 1301; the end of the second rotating connector 13 is fixedly connected to the shovel plate 2. The first rotating connector 12 is provided with multiple positioning holes 1201 surrounding the rotating shaft, and the third rotating connector 14 is provided with multiple positioning protrusions 1402 that cooperate with the positioning holes 1201. Through the cooperation of the positioning holes 1201 on the first rotating connector 12 and the positioning protrusions 1402 on the third rotating connector 14, the angle of the shovel plate 2 can be precisely adjusted to adapt to different soft ground conditions and garbage collection needs. This utility model combines the adjustable-angle shovel plate 2 and the vibrating screen 7 structure to effectively collect garbage on soft ground. The shovel plate 2 can adjust its angle according to the ground conditions to smoothly scoop up garbage, and the vibrating screen 7 removes mud and sand from the garbage, ensuring that the collected garbage is mainly garbage, reducing subsequent workload and improving collection efficiency. In addition, the shovel plate 2 of this utility model can achieve precise adjustment of the angle of the shovel plate 2 through the first rotating connector 12, the second rotating connector 13 and the third rotating connector 14, so as to meet different garbage collection needs.

[0026] Specifically, such as Figure 1 As shown, the lifting assembly 6 includes a second drive motor 15, a drive screw connecting seat 601, multiple first optical axis connecting seats 602, and a second optical axis connecting seat 603 that cooperates with the first optical axis connecting seats 602. The second drive motor 15 and the first optical axis connecting seats 602 are disposed on the upper side of the first fixed plate 3. The drive screw connecting seat 601 and the second optical axis connecting seat 603 are disposed on the upper side of the second fixed plate 5. A driven optical axis 604 sleeved in the second optical axis connecting seat 603 is fixed on the first optical axis connecting seat 602, and a driving screw 605 sleeved in the drive screw connecting seat 601 is connected to the output end of the second drive motor 15. The second drive motor 15 drives the active lead screw 605 to rotate. The active lead screw 605 cooperates with the drive lead screw connecting seat 601. The driven optical shaft 604 is fixed on the first optical shaft connecting seat 602 and sleeved in the second optical shaft connecting seat 603. Through the optical shaft transmission principle, the second fixed plate 5 is raised and lowered, thereby adjusting the height of the vibrating screen 7 to adapt to different working environments. This utility model uses the lifting component 6 to raise and lower the second fixed plate 5, thereby adjusting the height of components such as the vibrating screen 7. This helps to make reasonable adjustments according to the thickness of the garbage or the condition of the soft ground, improving the applicability of the device.

[0027] Specifically, such as Figure 4As shown, the crank mechanism 9 includes a crank 901 connected to the output shaft of the first drive motor 8. A first connecting rod 902 is rotatably connected to the outer surface of the crank 901, and a first rotating rod 903 is rotatably connected to the end of the first connecting rod 902. The first connecting rod 902 is provided with multiple first rotating holes 904 and second rotating holes 905. The crank 901 is provided with multiple third rotating holes 906 arranged in a cross shape around its axis, which mate with the first rotating holes 904. The first rotating rod 903 mates with the second rotating holes 905. This mating method can accurately determine the connection position between the crank 901 and the first connecting rod 902, and can ensure that the entire crank mechanism 9 can transmit motion according to the designed motion mode by the mating of different first rotating holes 904 with different third rotating holes 906 and different second rotating holes 905 with the first rotating rod 903.

[0028] Specifically, such as Figure 4 and Figure 5 As shown, the linkage mechanism 10 includes a set of second connecting rods 1001 rotatably connected to both ends of the first rotating rod 903. A first limiting member 1004 is fixedly installed on the inner side of the second connecting rod 1001 on the first rotating rod 903. A second rotating rod 1002 is fixed between the mounting rods 4 in the same set. The second rotating rod 1002 is rotatably connected to the second connecting rod 1001. A second limiting member 1005 is fixedly installed on the second rotating rod 1002 between the second connecting rod 1001 and the mounting rod 4. A third rotating rod 1003 passes through the front end of the vibrating screen 7. The end of the second connecting rod 1001 is rotatably connected to the third rotating rod 1003. A third limiting member 1006 is fixedly installed on the third rotating rod 1003 between the second connecting rod 1001 and the vibrating screen 7.

[0029] Specifically, such as Figure 6 As shown, the rotating rod mechanism 11 includes a fourth rotating rod 1101 passing through the rear end of the mounting rod 4. A set of third connecting rods 1105 are rotatably connected to both ends of the fourth rotating rod 1101. A fourth limiting member 1103 is fixedly installed on the fourth rotating rod 1101 and installed inside the third connecting rod 1105. A fifth rotating rod 1102 is passing through the rear end of the vibrating screen 7. The fifth rotating rod 1102 is rotatably connected to the end of the third connecting rod 1105. A fifth limiting member 1104 is fixedly installed on the fifth rotating rod 1102 and installed between the third connecting rod 1105 and the vibrating screen 7.

[0030] This utility model, through the connection design of the first drive motor 8, crank mechanism 9, connecting rod mechanism 10, rotating rod mechanism 11 and vibrating screen 7, enables the vibrating screen 7 to vibrate stably, and converts the rotational motion of the first drive motor 8 into the reciprocating motion of the vibrating screen 7.

[0031] The first limiting member 1004, the second limiting member 1005, the third limiting member 1006, the fourth limiting member 1103, and the fifth limiting member 1104 are divided into two parts and are connected by bolts to be fixed on the corresponding rotating rods, thereby limiting the relative movement range of the corresponding connecting rods and preventing excessive offset or disconnection.

[0032] Work process

[0033] After the device is started, the shovel 2, adjusted to the desired angle, begins to scoop up the garbage on the soft ground, depending on the softness of the surface. Due to the special characteristics of the soft ground, the shovel 2 can smoothly scoop up the garbage and transport it to the vibrating screen 7. Simultaneously, the first drive motor 8 on the second fixed plate 5 starts, and the output shaft of the first drive motor 8 drives the crank 901 to rotate, transmitting the rotation to the first rotating rod 903 through the first connecting rod 902. The first rotating rod 903 drives the second connecting rods 1001 at both ends to move. The second connecting rods 1001 maintain their relative position through the second rotating rods 1002 fixed on the mounting rod 4, and transmit force to the vibrating screen 7 through the third rotating rod 1003 between the ends of the second connecting rods 1001 in the same group. The linkage mechanism 10 at the rear end of the mounting rod 4 also works in coordination, with the fourth rotating rod 1101 passing through the mounting rod 4, and the third connecting rods 1105 at both ends transmitting force to the vibrating screen 7 through the fifth rotating rod 1102. Under the combined action of crank mechanism 9, connecting rod mechanism 10, and rotating rod mechanism 11, vibrating screen 7 generates stable vibration. Vibrating screen 7 has multiple inclined surfaces, and multiple sets of sand discharge holes 701 on these inclined surfaces allow sand and mud in the waste to fall through the discharge holes 701 during vibration, while the waste remains on vibrating screen 7, achieving separation of sand and mud from waste and ensuring that mainly waste is collected. During operation, if the thickness of the waste changes or the condition of the soft ground changes, lifting assembly 6 can be activated. The second drive motor 15 drives the active lead screw 605 to rotate. The active lead screw 605 cooperates with the drive lead screw connecting seat 601. Since the driven optical shaft 604 is fixed on the first optical shaft connecting seat 602 and sleeved in the second optical shaft connecting seat 603, the second fixed plate 5 is raised and lowered through the optical shaft transmission principle, thereby adjusting the height of components such as vibrating screen 7 to adapt to the new working environment. The device moves continuously on the soft ground via casters 16, shovels 2 continuously scoop up the garbage, and vibrating screens 7 continuously separate the mud and sand until the garbage collection on the soft ground is completed.

[0034] In summary, this utility model enables the separation of mud and sand on soft surfaces, facilitating waste collection and improving waste collection efficiency.

Claims

1. A soft ground garbage collection device, comprising a frame (1), wherein the bottom of the frame (1) is provided with casters (16), characterized in that: The front end of the frame (1) is rotatably connected to a shovel plate (2). The upper side of the frame (1) is provided with a first fixing plate (3). The first fixing plate (3) is provided with a lifting assembly (6). The lifting end of the lifting assembly (6) is connected to a second fixing plate (5). The bottom surfaces of the second fixing plate (5) are respectively provided with mounting rods (4). The rear end of the mounting rods (4) is rotatably connected to a pair of rotating rod mechanisms (11). The front end of the mounting rods (4) is provided with a connecting rod mechanism (10). A vibrating screen (7) is provided between the rotating rod mechanism (11) and the connecting rod mechanism (10). The second fixing plate (5) is provided with a first drive motor (8). The output shaft of the first drive motor (8) is connected to a crank mechanism (9). The crank mechanism (9) is connected to the connecting rod mechanism (10).

2. The soft ground litter collecting device of claim 1, wherein: The front end of the frame (1) is provided with a slide groove (101), and a first rotating connector (12) is slidably connected to the slide groove (101); the front end of the first rotating connector (12) is rotatably fitted with a second rotating connector (13) and a third rotating connector (14); the second rotating connector (13) is provided with a positioning groove (1301), and the third rotating connector (14) is provided with a positioning post (1401) embedded in the positioning groove (1301); the end of the second rotating connector (13) is fixedly connected to the shovel plate (2).

3. The soft ground litter collecting device of claim 2, wherein: The first rotating connector (12) is provided with a plurality of positioning holes (1201) surrounding the rotating shaft, and the third rotating connector (14) is provided with a plurality of positioning protrusions (1402) that cooperate with the positioning holes (1201).

4. The soft ground litter collecting device of claim 1, wherein: The lifting assembly (6) includes a second drive motor (15), a drive screw connecting seat (601), a plurality of first optical axis connecting seats (602), and a second optical axis connecting seat (603) that cooperates with the first optical axis connecting seat (602); the second drive motor (15) and the first optical axis connecting seat (602) are disposed on the upper side of the first fixed plate (3); the drive screw connecting seat (601) and the second optical axis connecting seat (603) are disposed on the upper side of the second fixed plate (5); a driven optical axis (604) sleeved in the second optical axis connecting seat (603) is fixed on the first optical axis connecting seat (602), and a drive screw (605) sleeved in the drive screw connecting seat (601) is connected to the output end of the second drive motor (15).

5. The soft ground litter collecting device of claim 1, wherein: The crank mechanism (9) includes a crank (901) connected to the output shaft of the first drive motor (8), and a first connecting rod (902) is rotatably connected to the outer surface of the crank (901), and a first rotating rod (903) is rotatably connected to the end of the first connecting rod (902).

6. The soft ground litter collecting device of claim 5, wherein: The first connecting rod (902) is provided with a plurality of first rotating holes (904) and second rotating holes (905). The crank (901) is provided with a plurality of third rotating holes (906) in a cross shape around the axis, which cooperate with the first rotating holes (904). The first rotating rod (903) cooperates with the second rotating holes (905).

7. The soft ground litter collecting device of claim 5, wherein: The linkage mechanism (10) includes a set of second connecting rods (1001) rotatably connected to both ends of the first rotating rod (903). A first limiting member (1004) is fixed on the first rotating rod (903) and installed inside the second connecting rod (1001). A second rotating rod (1002) is fixed between the mounting rods (4) in the same set. The second rotating rod (1002) is rotatably connected to the second connecting rod (1001). A second limiting member (1005) is fixed on the second rotating rod (1002) and installed between the second connecting rod (1001) and the mounting rod (4). A third rotating rod (1003) passes through the front end of the vibrating screen (7). The end of the second connecting rod (1001) is rotatably connected to the third rotating rod (1003). A third limiting member (1006) is fixed on the third rotating rod (1003) and installed between the second connecting rod (1001) and the vibrating screen (7).

8. The soft ground litter collecting device of claim 1, wherein: The rotating rod mechanism (11) includes a fourth rotating rod (1101) passing through the rear end of the mounting rod (4). A set of third connecting rods (1105) are rotatably connected to both ends of the fourth rotating rod (1101). A fourth limiting member (1103) installed inside the third connecting rod (1105) is fixed on the fourth rotating rod (1101). A fifth rotating rod (1102) passes through the rear end of the vibrating screen (7). The fifth rotating rod (1102) is rotatably connected to the end of the third connecting rod (1105). A fifth limiting member (1104) installed between the third connecting rod (1105) and the vibrating screen (7) is fixed on the fifth rotating rod (1102).

9. The soft ground litter collecting device of claim 1, wherein: The mounting rod (4) is slidably connected to the frame (1) in a vertical manner.

10. The soft ground litter collecting device of claim 1, wherein: The vibrating screen (7) is provided with multiple inclined surfaces, and multiple sets of sand discharge holes (701) are provided on the inclined surfaces.