Dustbin rear door locking mechanism

Abstract

The utility model discloses a locking mechanism for a rear door of a garbage can, which relates to the technical field of garbage can locking equipment and comprises a hydraulic cylinder and a hinge four-bar mechanism. One bottom angle of a triangular structure of a middle connecting rod of the hinge four-connecting-rod mechanism is hinged to the output end of the hydraulic cylinder, and two side connecting rods of the hinge four-connecting-rod mechanism are rotationally connected with the outer wall of the dustbin body. The hydraulic cylinder is adopted as a power source, the stress of the oil cylinder is avoided or reduced through the hinge four-bar mechanism, and then the situation that the rear door is exploded or cannot be locked under the condition that the oil cylinder loses efficacy or the pressure of a hydraulic system is reduced is effectively prevented; a hinge four-connecting-rod mechanism is adopted, and the force borne by the oil cylinder is dispersed to other positions in a mode that a connecting rod passes through a dead point; after locking, the gravity of the rear door welding assembly is dispersed to the support and the positioning pin of the uppermost straight connecting rod from the original action on the hydraulic rod through the hinge four-connecting-rod mechanism; and the hydraulic cylinder is not stressed, so that the problem of box explosion caused by hydraulic failure is solved.

Description

Technical Field

[0001] This utility model relates to the technical field of garbage bin locking equipment, specifically a garbage bin rear door locking mechanism. Background Technology

[0002] With the high-quality development of modern Chinese cities and the continuous increase in urban population, the demand for the classification, processing, compression, and transportation of household waste is growing, driven by the need to promote energy conservation and emission reduction, develop a low-carbon economy, and protect the urban environment. Mobile waste compression containers, as a new type of waste treatment equipment with environmental protection, safety, and economy features, have been widely used and promoted both domestically and internationally. As a waste treatment device integrating storage, compression, and transportation, it offers multiple advantages such as space saving, reduced transportation costs, and environmental friendliness and energy efficiency.

[0003] As a crucial structural element of mobile compression boxes, the rear door typically employs a hydraulic linkage mechanism for locking. This method is characterized by its simple structure and ease of maintenance. Its main working principle is as follows: a locking cylinder is fixed to a mounting bracket at the rear of the box, with its piston rod connected to the rear door locking plate. When the locking cylinder retracts, the rear door locking plate rotates around its pivot. The locking plate hooks onto the lock handle on the rear door, raising it. The rear door then moves towards the rear door frame of the box via a sliding joint on the door frame, ensuring a tight seal. The locking cylinder reaches its final stroke and holds its position, at which point the rear door is locked.

[0004] The rear door locking mechanism of the mobile compression box uses a hydraulic cylinder. If oil leakage or other reasons cause the hydraulic system to fail, the rear door may not be able to lock or the box may burst, leading to garbage leakage.

[0005] The failure process of the hydraulic system is analyzed as follows: After the rear door is locked, its entire weight rests on the locking plate. Simultaneously, the waste inside the moving compression box is compressed. During operation and transfer, the rear door is subjected to pressure from the internal waste, which indirectly acts on the rear door locking plate. The force on the rear door locking plate is transmitted to the hydraulic cylinder, which is then subjected to tensile force. If the locking cylinder fails at this point, the rear door will disengage, and waste will leak from the rear door.

[0006] The rear door is the unloading channel for the mobile compression box. The hydraulic components are under stress for a long time, and in a highly corrosive environment, system oil leakage is likely to occur, which will cause the rear door to fail to lock and cause garbage leakage. Utility Model Content

[0007] The purpose of this utility model is to provide a locking mechanism for the rear door of a trash can to solve the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a rear door locking mechanism for a garbage bin, comprising a hydraulic cylinder and a four-bar linkage mechanism. The middle link of the four-bar linkage mechanism is a triangular structure. One base angle of the triangular structure of the middle link of the four-bar linkage mechanism is hinged to the output end of the hydraulic cylinder. The two side links of the four-bar linkage mechanism are respectively rotatably connected to the outer wall of the garbage bin. One side link is hinged to one base angle of the triangular structure of the middle link, and the other side link is hinged to one apex angle of the triangular structure of the middle link. The side link located away from the hydraulic cylinder is a rear door locking plate.

[0009] Furthermore, the hinged four-bar linkage includes a rear door locking plate, a triangular link, and a straight link. The three corners of the triangular link are respectively hinged to the rear door locking plate, the straight link, and the hydraulic cylinder. The bottom of the outer wall of the rear door locking plate is rotatably connected to the outer wall of the garbage bin. The end of the outer wall of the rear door locking plate away from the triangular link is a hook plate structure. The end of the straight link away from the triangular link is rotatably connected to the outer wall of the garbage bin.

[0010] Furthermore, a positioning pin is provided on the outer wall of the trash can between the rear door locking plate and the straight connecting rod.

[0011] Furthermore, the rear door locking plate and the straight connecting rod are rotatably connected to the outer wall of the garbage bin via positioning shafts, and the axes of the positioning shafts and the positioning pins are on the same straight line.

[0012] Furthermore, a baffle is sleeved on the outside of the straight connecting rod at one end of the positioning shaft, and a bolt fixing assembly is provided on the outside of the baffle on the positioning shaft.

[0013] Furthermore, the triangular connecting rod is a double-layer steel plate structure, and the hinges at the three corners of the triangular connecting rod are connected by countersunk screws.

[0014] Furthermore, the outer wall of the garbage bin is provided with a cylinder seat that matches the hydraulic cylinder, and one end of the hydraulic cylinder is fixedly connected to the cylinder seat.

[0015] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0016] 1. This utility model, by setting up a hydraulic cylinder, a four-bar linkage mechanism, a rear door locking plate, a triangular connecting rod, a straight connecting rod, and a positioning pin, uses a hydraulic cylinder as the power source. The four-bar linkage mechanism avoids or reduces the force on the cylinder, effectively preventing the rear door from bursting open or failing to lock in case of cylinder failure or a drop in hydraulic system pressure. The rear door locking mechanism uses a four-bar linkage mechanism, distributing the force on the cylinder to other positions by using the connecting rods to pass through the dead center. During the locking action, the hydraulic cylinder provides thrust to push the four-bar linkage mechanism past the dead center, and the uppermost straight connecting rod rests against the positioning pin after passing the dead center. After locking, the weight of the rear door welded components, which originally acted on the hydraulic rod, is distributed to the support of the uppermost straight connecting rod and the positioning pin through the four-bar linkage mechanism. The hydraulic cylinder is not stressed, solving the problem of the box bursting due to hydraulic failure.

[0017] 2. In this utility model; in the linkage system, the lever arms of segments AB and CD will change with the movement of the mechanism, so let the lever arms of segments AB and CD be LAB and LCD; the direction of the force provided by the rear door locking cylinder is horizontal, and this design also uses a hydraulic cylinder to provide the force in the horizontal direction; the magnitude of F is proportional to the values ​​of LAB and LCD. Starting from the open state, the hydraulic cylinder extends and pushes the linkage mechanism until it is locked; when the linkage mechanism moves to the dead point, LAB first increases and then decreases; LCD continues to decrease to 0; the angle α between F and the lever arm DE increases; when the linkage mechanism is in the locked state, LCD = 0, at this time the linkage mechanism pushes past the dead point, and the hydraulic cylinder is not under force. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a front view of the entire utility model;

[0020] Figure 2 This is a front view of the four-bar linkage mechanism of this utility model in the locked state;

[0021] Figure 3 This is a front view of the four-bar linkage mechanism of this utility model in its open state;

[0022] Figure 4 This is a schematic diagram of the design principle of the hinged four-bar linkage of this utility model;

[0023] Figure 5 This is a mechanical analysis diagram of the locked state of the four-bar linkage of this utility model;

[0024] Figure 6 This is a mechanical analysis diagram of the partially opened state of the hinged four-bar linkage of this utility model;

[0025] Figure 7 This is a mechanical analysis diagram of the four-bar linkage mechanism of this utility model in its fully open state.

[0026] In the diagram: 1. Hydraulic cylinder; 2. Four-bar linkage; 201. Rear door locking plate; 202. Triangular connecting rod; 203. Straight connecting rod; 204. Countersunk screw; 3. Garbage bin body; 4. Positioning pin; 5. Baffle; 6. Bolt fixing assembly; 7. Cylinder seat. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figures 1-7 This utility model provides a technical solution: a rear door locking mechanism for a garbage bin, comprising a hydraulic cylinder 1 and a four-bar linkage 2. The four-bar linkage 2 includes a rear door locking plate 201, a triangular connecting rod 202, and a straight connecting rod 203. The three corners of the triangular connecting rod 202 are respectively hinged to the rear door locking plate 201, the straight connecting rod 203, and the hydraulic cylinder 1. The bottom of the outer wall of the rear door locking plate 201 is rotatably connected to the outer wall of the garbage bin body 3. The end of the outer wall of the rear door locking plate 201 away from the triangular connecting rod 202 is a hook plate structure. The end of the straight connecting rod 203 away from the triangular connecting rod 202 is rotatably connected to the outer wall of the garbage bin body 3. A positioning pin 4 is provided on the outer wall of the garbage bin body 3 between the rear door locking plate 201 and the straight connecting rod 203.

[0029] In one embodiment, the rear door locking plate 201 and the straight connecting rod 203 are rotatably connected to the outer wall of the garbage bin 3 via positioning shafts. The positioning shafts and the axis of the positioning pin 4 are on the same straight line, ensuring that the positioning pin 4 provides limiting and blocking support for the straight connecting rod 203 after it moves to the dead point position, thus ensuring the structural stability of the hinge four-bar linkage 2 when it is under force.

[0030] In one embodiment, a baffle 5 is sleeved on the outside of the straight connecting rod 203 at one end of the positioning shaft, and a bolt fixing assembly 6 is provided on the outside of the baffle 5 on the positioning shaft, which includes a hexagonal bolt, a spring washer, and a flat washer; the baffle 5 limits and blocks the straight connecting rod 203 on the outside to prevent the straight connecting rod 203 from falling off the positioning shaft when under force; the bolt fixing assembly 6 enhances the stability of the baffle 5.

[0031] In one embodiment, the triangular connecting rod 202 is a double-layer steel plate structure, and the hinges at the three corners of the triangular connecting rod 202 are connected by countersunk screws 204; when the locking mechanism is working, the three countersunk screws 204 are subjected to shear force, and the maximum shear force is 12KN; according to the verification calculation, the compressive strength and shear strength of the screws meet the design requirements.

[0032] In one embodiment, the outer wall of the garbage bin 3 is provided with a cylinder seat 7 that matches the hydraulic cylinder 1, and one end of the hydraulic cylinder 1 is fixedly connected to the cylinder seat 7; the cylinder seat 7 provides fixed support for the hydraulic cylinder 1 to ensure the stability of the horizontal adjustment hinge four-bar linkage 2 of the hydraulic cylinder 1.

[0033] The working principle of this utility model:

[0034] Refer to the instruction manual appendix Figures 1-7 This utility model uses a hydraulic cylinder 1 as a power source and a four-bar linkage 2 to avoid or reduce the force on the cylinder, thereby effectively preventing the rear door from bursting open or failing to lock in the event of cylinder failure or hydraulic system pressure drop.

[0035] The rear door locking mechanism adopts a four-bar linkage 2, which uses the linkage passing through the dead point to distribute the force on the hydraulic cylinder to other positions. When locking, the hydraulic cylinder 1 provides thrust to push the four-bar linkage 2 past the dead point. The dead point is the position when the two corners of the straight link 203 and the triangular link 202 are on the same straight line. After passing the dead point, the uppermost straight link 203 rests on the positioning pin 4. After locking, the weight of the rear door welded assembly, which originally acted on the hydraulic rod, is distributed through the four-bar linkage 2 to the support of the uppermost straight link 203 and the positioning pin 4. The hydraulic cylinder 1 is not under force, which solves the problem of hydraulic failure leading to box explosion.

[0036] The principle of the hinged four-bar linkage 2 is as follows: Figure 4 As shown, the degrees of freedom of this linkage mechanism are calculated: the number of components K = 4; the number of moving components n = 3; the lower pair Pl = 4; the higher pair Ph = 0;

[0037] The degree of freedom of the linkage mechanism is F = 3n - 2Pl - Ph = 9 - 4 = 1;

[0038] Mechanical calculations:

[0039] Given that the weight of the welded assembly of the rear door of the mobile compression box is 456.4 kg, the force at point A is G = 4564 N (the value of gravitational acceleration g is 9.8 N / kg; for a more intuitive comparison of the simulation data, the value of gravitational acceleration g is roughly calculated as 10 N / kg), and the direction is vertically downward. In the linkage system, the lever arms of segments AB and CD will change with the movement of the mechanism, so let the lever arms of segments AB and CD be LAB and LCD, respectively. Set BC = 132 mm and DE = 100 mm. The direction of the force provided by the rear door locking cylinder is horizontal, and this design also uses hydraulic cylinder 1 to provide the horizontal force. Let the force that hydraulic cylinder 1 needs to provide at point E be F, and let the angle between F and DE be α. The calculation formula for F is derived from the force analysis.

[0040] F=4564*LAB / 132*LCD / 100 / sinα

[0041] ≈0.346*LAB*LCD / sinα;

[0042] The formula shows that the value of F is directly proportional to the values ​​of LAB and LCD.

[0043] Starting from the open position, hydraulic cylinder 1 extends and pushes the linkage mechanism until it locks; the linkage mechanism moves to the dead point, LAB first increases and then decreases; LCD continues to decrease to 0; the angle α between F and lever arm DE increases;

[0044] When segment AB is rotated to the horizontal position, as follows: Figure 6 As shown, LAB is at its maximum, at which point LAB = 151.31 mm; LCD = 34.08 mm; α = 45°; F = 2523 N;

[0045] The LCD screen is at its maximum size the instant the mechanism begins to move from the open state to the locked state, such as... Figure 7 As shown, at this time, LAB = 145.05 mm; LCD = 89.04 mm; α = 22°; F = 11929 N;

[0046] Therefore, it can be seen that F is at its maximum value at the instant the door locking mechanism begins to lock, at which time F = 11928N, approximately 12KN;

[0047] When the mechanism is in the locked state, such as Figure 5 As shown, LCD=0, F=0N. At this time, the linkage mechanism pushes past the dead point, and the hydraulic cylinder 1 is not under force.

[0048] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A locking mechanism for the rear door of a trash can, comprising a hydraulic cylinder (1) and a four-bar linkage mechanism (2), characterized in that: The middle link of the hinged four-bar linkage (2) is a triangular structure. One base angle of the triangular structure of the middle link of the hinged four-bar linkage (2) is hinged to the output end of the hydraulic cylinder (1). The two side links of the hinged four-bar linkage (2) are rotatably connected to the outer wall of the garbage bin (3). One side link is hinged to one base angle of the triangular structure of the middle link, and the other side link is hinged to one apex angle of the triangular structure of the middle link. The side link located away from the hydraulic cylinder (1) is the rear door locking plate (201).

2. The locking mechanism for the rear door of a trash can according to claim 1, characterized in that: The hinged four-bar linkage (2) includes a rear door locking plate (201), a triangular link (202) and a straight link (203). The three corners of the triangular link (202) are respectively hinged to the rear door locking plate (201), the straight link (203) and the hydraulic cylinder (1). The bottom of the outer wall of the rear door locking plate (201) is rotatably connected to the outer wall of the garbage bin (3). The end of the outer wall of the rear door locking plate (201) away from the triangular link (202) is a hook plate structure. The end of the straight link (203) away from the triangular link (202) is rotatably connected to the outer wall of the garbage bin (3).

3. The locking mechanism for the rear door of a trash can according to claim 2, characterized in that: The outer wall of the garbage bin (3) is provided with a positioning pin (4) between the rear door locking plate (201) and the straight connecting rod (203).

4. The locking mechanism for the rear door of a trash can according to claim 3, characterized in that: The rear door locking plate (201) and the straight connecting rod (203) are rotatably connected to the outer wall of the garbage bin (3) through the positioning shaft, and the axis of the positioning shaft and the positioning pin (4) are on the same straight line.

5. A garbage bin rear door locking mechanism according to claim 4, characterized in that: One end of the positioning shaft is fitted with a baffle (5) on the outside of the straight connecting rod (203), and the positioning shaft is fitted with a bolt fixing assembly (6) on the outside of the baffle (5).

6. A garbage bin rear door locking mechanism according to claim 2, characterized in that: The triangular connecting rod (202) is a double-layer steel plate structure, and the hinges at the three corners of the triangular connecting rod (202) are connected by countersunk screws (204).

7. The locking mechanism for the rear door of a trash can according to claim 1, characterized in that: The outer wall of the garbage bin (3) is provided with a cylinder seat (7) that matches the hydraulic cylinder (1), and one end of the hydraulic cylinder (1) is fixedly connected to the cylinder seat (7).

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