An overloading protection mechanism for a bulldozer blade

Abstract

The application discloses a bulldozing shovel overload protection mechanism, which comprises a U-shaped connecting beam, a lifting hydraulic oil cylinder and a bulldozing shovel, symmetrically arranged between the U-shaped connecting beam and the bulldozing shovel are auxiliary mechanisms for assisting the bulldozing shovel to make a retreat action, the auxiliary mechanisms comprise two elastic telescopic ears fixedly connected below the outside of the bulldozing shovel, a fixed shaft is fixedly connected between the two telescopic ears, a gear is fixedly connected to the middle part of the fixed shaft, an elastic telescopic rack is arranged above the gear, and the elastic telescopic rack is located outside the bulldozing shovel; a stabilizing mechanism for improving the connecting stability of the bulldozing shovel is arranged between the U-shaped connecting beam and the bulldozing shovel, the stabilizing mechanism comprises an elastic telescopic rod fixedly connected to the outside of the bulldozing shovel, and an inclined telescopic rod is hingedly arranged on the middle part of the U-shaped connecting beam and outside the elastic telescopic rod. The bulldozing shovel can make a retreat action in time through the mechanical driving mechanism, so that the bulldozing shovel is prevented from being damaged due to continuous extrusion of large hard objects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bulldozer blade overload protection, and particularly relates to a bulldozer blade overload protection mechanism. BACKGROUND

[0002] The bulldozer blade is a commonly used device for earthmoving of engineering machinery, and excavators are often configured as a standard. The maximum width of the bulldozer blade is generally the same as that of the chassis of the whole machine. The bulldozer blade can play a role in removing obstacles in front, cleaning the road surface or fixing the machine body under certain working conditions. The control lever of the bulldozer blade is arranged in the cab of the excavator, and the driver controls the lifting of the bulldozer blade through the control lever to assist the working device of the excavator. Due to the complex and diverse soil environment, some large hard objects (such as large stones and large metal products) are often hidden in the soil. When the excavator is working, the bulldozer blade often collides with these large hard objects, causing damage to the blade plate of the bulldozer blade.

[0003] Through retrieval, the invention patent with the Chinese patent number CN 113309160 B discloses a bulldozer blade overload protection structure and method, which comprises a bulldozer blade, a hydraulic driving mechanism, a controller and a sensor. The bulldozer blade transmits the force affecting the internal hydraulic value of the hydraulic driving mechanism to the hydraulic driving mechanism through mutual linkage with the hydraulic driving mechanism. The controller monitors the internal hydraulic value of the hydraulic driving mechanism through the sensor and triggers the hydraulic driving mechanism to drive the bulldozer blade to avoid the hard object according to the internal hydraulic value of the hydraulic driving mechanism. Compared with the prior art, the invention patent with the Chinese patent number CN 113309160 B can monitor the change of the pressure value borne by the front end of the bulldozer blade in real time, and make avoidance action in time when encountering a hard object, thereby protecting the bulldozer blade from damage.

[0004] However, in the process of making the bulldozer blade make avoidance action in time through the hydraulic driving mechanism, the requirement for the cooperation degree between each electrical element in the hydraulic driving mechanism is extremely high, and the soil environment is complex and diverse. Once a certain electrical element in the hydraulic driving mechanism is damaged, the bulldozer blade cannot make avoidance action in time. Therefore, a mechanical driving mechanism is needed to make the bulldozer blade make avoidance action in time. SUMMARY

[0005] The purpose of the present application is to solve the problem in the prior art that the requirement for the cooperation degree between each electrical element in the hydraulic driving mechanism is extremely high, and once a certain electrical element in the hydraulic driving mechanism is damaged, the bulldozer blade cannot make avoidance action in time. A bulldozer blade overload protection mechanism is provided.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] The bulldozer blade overload protection mechanism comprises a U-shaped connecting beam, a lifting hydraulic cylinder symmetrically hinged at the top of the U-shaped connecting beam and a bulldozer blade for bulldozing; an auxiliary mechanism for assisting the bulldozer blade to make a retreat action is symmetrically arranged between the U-shaped connecting beam and the bulldozer blade, the auxiliary mechanism comprises two elastic expansion ears fixedly connected below the outside of the bulldozer blade, a fixed shaft fixedly connected between the two elastic expansion ears, a gear fixedly connected to the middle part of the fixed shaft, an elastic expansion rack arranged above the gear and located outside the bulldozer blade; a stabilizing mechanism for lifting the connecting stability of the bulldozer blade is arranged between the U-shaped connecting beam and the bulldozer blade, the stabilizing mechanism comprises an elastic expansion rod fixedly connected above the outside of the bulldozer blade, and an inclined expansion rod hinged to the middle part of the U-shaped connecting beam is arranged outside the elastic expansion rod.

[0008] The technical scheme further comprises:

[0009] The two elastic expansion ears each comprise an inner ear fixedly connected below the outside of the bulldozer blade, an outer sleeve ear slidingly connected to the outside of the inner ear, a buffer spring A fixedly connected to the end of the inner ear and fixedly connected to the outer sleeve ear, and the two ends of the fixed shaft are fixedly connected between the two outer sleeve ears; the stiffness coefficient of the buffer spring A is large, and the buffer spring A will not be compressed when the bulldozer blade normally bulldozes.

[0010] The auxiliary mechanism further comprises a connecting seat A for connecting the U-shaped connecting beam and the two outer sleeve ears, one side of the connecting seat A is fixedly connected to the outside of the U-shaped connecting beam, the other side of the connecting seat A is provided with a groove, the inner side of the groove is symmetrically rotatably connected with a rotating shaft, and the two outer sleeve ears are rotatably connected between the two rotating shafts.

[0011] The bottom of the connecting seat A is fixedly connected with a U-shaped limiting plate, and the bottoms of the two outer sleeve ears are in contact with the top of the U-shaped limiting plate; that is, the two elastic expansion ears, the fixed shaft and the gear can only jointly rotate upwards between the two rotating shafts.

[0012] The elastic expansion rack comprises a fixed plate fixedly connected to the top of the U-shaped connecting beam, a fixed rod fixedly connected to the outside of the fixed plate, and a rack meshing with the gear slidingly connected to the outside of the fixed rod; when the rack is pressed to the left by the bulldozer blade, the rack can slide along the outside of the fixed rod, and the end of the rack is a certain distance away from the outside of the bulldozer blade.

[0013] A reset spring is fixedly connected between the fixed plate and the rack and sleeved outside the fixed rod; the reset spring is used to assist the rack to reset.

[0014] The elastic telescopic rod comprises an inner rod fixedly connected above the outside of the bulldozing blade, an outer sleeve rod slidingly connected to the outside of the inner rod, and a buffer spring B fixedly connected to the end of the inner rod.

[0015] The end of the elastic telescopic rod and the end of the inclined telescopic rod close to each other are fixedly connected with sleeves, the two sleeves are rotatably connected with shafts, and the two ends of the two shafts are fixedly connected with connecting ears.

[0016] The present application has the following advantages:

[0017] 1. In the present application, when the bulldozing blade contacts and extrudes a large hard object, it will move to the left relative to the U-shaped connecting beam, extrude the buffer spring A in the two telescopic ears, and contact the rack with the bulldozing blade, and when the rack is pushed to the left, the gear meshing with the rack will drive the two telescopic ears to rotate upward through the fixed shaft, so that the bulldozing blade can rotate upward to avoid the action, instead of continuously extruding the large hard object, that is, the bulldozing blade can make an avoidance action in time through the mechanical driving mechanism, avoiding damage caused by continuous extrusion of the bulldozing blade on the large hard object.

[0018] 2. In the present application, when the bulldozing blade is extruded by the extrusion force, the buffer spring B in the elastic telescopic rod will also be extruded, and when the rack is pushed by the bulldozing blade to make the gear rotate, the inclined telescopic rod will also be deflected to assist the bulldozing blade to rotate upward to make an avoidance action, that is, through the setting of the stabilizing mechanism, the bulldozing blade can be more stable when making an avoidance action, thereby improving the stability of the whole mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a first external structure schematic view of a bulldozing blade overload protection mechanism proposed in the present application.

[0020] Figure 2 It is a second external structure schematic view of a bulldozing blade overload protection mechanism proposed in the present application.

[0021] Figure 3 It is a first internal structure schematic view of a bulldozing blade overload protection mechanism proposed in the present application. Figure 2 It is a structure enlarged schematic view of position A in the present application.

[0022] Figure 4 It is a structure enlarged schematic view of position B in the present application. Figure 2 It is a structure enlarged schematic view of position B in the present application.

[0023] Figure 5 It is a first internal structure schematic view of a bulldozing blade overload protection mechanism proposed in the present application.

[0024] Figure 6 Figure 2 is a second internal structure diagram of a bulldozing blade overload protection mechanism according to the present application.

[0025] Figure 1: 1, U-shaped connecting beam; 2, lifting hydraulic cylinder; 3, bulldozing blade; 4, auxiliary mechanism; 41, elastic expansion ear; 411, inner ear; 412, outer sleeve ear; 413, buffer spring A; 42, fixed shaft; 43, gear; 44, elastic expansion rack; 441, fixed plate; 442, fixed rod; 443, rack; 444, return spring; 45, connecting seat A; 46, groove; 47, rotating shaft; 48, U-shaped limiting plate; 5, stabilizing mechanism; 51, elastic expansion rod; 511, inner rod; 512, outer sleeve rod; 513, buffer spring B; 52, inclined expansion rod; 53, sleeve; 54, rotating shaft; 55, connecting ear. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. EMBODIMENT

[0027] As shown in Figures 1-3 and Figures 5-6 , the present application proposes a bulldozing blade overload protection mechanism, which comprises a U-shaped connecting beam 1, a lifting hydraulic cylinder 2 symmetrically hinged at the top of the U-shaped connecting beam 1, and a bulldozing blade 3 for bulldozing, the U-shaped connecting beam 1 and the lifting hydraulic cylinder 2 are hinged at the front end of the excavator, and the U-shaped connecting beam 1 can be deflected and drive the bulldozing blade 3 and the auxiliary mechanism 4 on the bulldozing blade 3 to make lifting movement by starting the lifting hydraulic cylinder 2;

[0028] The auxiliary mechanism 4 for assisting the bulldozing blade 3 to make avoidance action is symmetrically arranged between the U-shaped connecting beam 1 and the bulldozing blade 3, the auxiliary mechanism 4 comprises two elastic expansion ears 41 fixedly connected to the outside below the bulldozing blade 3, each of the two expansion ears 41 comprises an inner ear 411 fixedly connected to the outside below the bulldozing blade 3, an outer sleeve ear 412 is slidingly connected to the outside of the inner ear 411, a buffer spring A 413 is fixedly connected to the inner ear 411 at the end of the inner ear 411, the stiffness coefficient of the buffer spring A 413 is large, the buffer spring A 413 will not be compressed when the bulldozing blade 3 normally bulldozes, a fixed shaft 42 is fixedly connected between the two expansion ears 41, and the two ends of the fixed shaft 42 are fixedly connected between the two outer sleeve ears 412;

[0029] The middle part of the fixed shaft 42 is fixedly connected with a gear 43, the upper part of the gear 43 is provided with an elastic telescopic rack 44, the elastic telescopic rack 44 is located outside the bulldozing blade 3, the elastic telescopic rack 44 comprises a fixed plate 441 fixedly connected to the top of the U-shaped connecting beam 1, a fixed rod 442 fixedly connected to the outside of the fixed plate 441, a rack 443 slidably connected to the outside of the fixed rod 442 and engaged with the gear 43, and a certain distance between the tail end of the rack 443 and the outside of the bulldozing blade 3, a reset spring 444 fixedly connected between the fixed plate 441 and the rack 443 and sleeved on the outside of the fixed rod 442, and the reset spring 444 is used for assisting the rack 443 to reset.

[0030] The auxiliary mechanism 4 further comprises a connecting seat A45 for connecting the U-shaped connecting beam 1 and the two outer sleeve ears 412, one side of the connecting seat A45 is fixedly connected to the outside of the U-shaped connecting beam 1, the other side of the connecting seat A45 is provided with a groove 46, the inside of the groove 46 is symmetrically rotatably connected with a rotating shaft 47, and the two outer sleeve ears 412 are rotatably connected between the two rotating shafts 47, that is, the two telescopic ears 41, the fixed shaft 42 and the gear 43 are rotatably connected between the two rotating shafts 47, the bottom of the connecting seat A45 is fixedly connected with a U-shaped limiting plate 48, and the bottom of the two outer sleeve ears 412 is in contact with the top of the U-shaped limiting plate 48, that is, the two telescopic ears 41, the fixed shaft 42 and the gear 43 can only be jointly upwardly rotated between the two rotating shafts 47.

[0031] In the embodiment: when the excavator is working, the bulldozing blade 3 is inserted into the soil to push the soil, when the bulldozing blade 3 contacts and extrudes a large hard object, under the extrusion force, the bulldozing blade 3 moves left relative to the U-shaped connecting beam 1, the U-shaped connecting beam 1 moving left extrudes the buffer spring A413 in the two telescopic ears 41 and approaches the rack 443, when the bulldozing blade 3 contacts the rack 443 and pushes the rack 443 to move left, the rack 443 slides and extrudes the reset spring 444 along the outside of the fixed rod 442, and the gear 43 engaged with the rack 44 drives the two telescopic ears 41 to rotate upward through the fixed shaft 42, so that the bulldozing blade 3 can rotate upward to make a avoiding action, instead of continuously extruding the large hard object;

[0032] After the bulldozing blade 3 passes the large hard object, the bulldozing blade 3 resets due to its own gravity, and the corresponding components in the auxiliary mechanism 4 also reset to assist the bulldozing blade 3 to make the next avoiding action on the large hard object;

[0033] The bulldozing blade overload protection mechanism makes the bulldozing blade 3 rotate upward to make an avoiding action when it contacts and extrudes a large hard object through the setting of the auxiliary mechanism 4, that is, the bulldozing blade 3 can make an avoiding action in time through the mechanical driving mechanism, so as to avoid damage caused by the bulldozing blade 3 continuously extruding the large hard object. Embodiment

[0034] As Figures 1-2 and Figures 4-6 shown, based on the basis of example one, by starting the lifting hydraulic cylinder 2 to make the U-shaped connecting beam 1 deflection, the bulldozing blade 3 and the auxiliary mechanism 4, the stabilizing mechanism 5 on the bulldozing blade 3 are synchronized to make lifting movement;

[0035] The U-shaped connecting beam 1 and the bulldozing blade 3 are provided with the stabilizing mechanism 5 for connecting the stability of the bulldozing blade 3, the stabilizing mechanism 5 includes the elastic telescopic rod 51 fixedly connected on the outside of the bulldozing blade 3, the elastic telescopic rod 51 includes the inner rod 511 fixedly connected on the outside of the bulldozing blade 3, the outer sleeve rod 512 is slidably connected with the outer side of the inner rod 511, the buffer spring B513 is fixedly connected with the end of the inner rod 511 in the inner side of the outer sleeve rod 512, and the buffer spring B513 also has a large stiffness coefficient, and the buffer spring B513 will not be compressed when the bulldozing blade 3 normally bulldozes.

[0036] The outer side of the elastic telescopic rod 51 is provided with the inclined telescopic rod 52 hinged in the middle of the U-shaped connecting beam 1, the sleeve 53 is fixedly connected with the end of the outer sleeve rod 512 and the inclined telescopic rod 52 close to each other, the rotating shaft 54 is rotatably connected between the two sleeves 53, and the connecting lug 55 is fixedly connected with the two ends of the two rotating shafts 54, that is, the end of the elastic telescopic rod 51 and the end of the inclined telescopic rod 52 close to each other are hinged with each other.

[0037] In the embodiment, the buffer spring A413 in the two telescopic lugs 41 is extruded under the extrusion force, and the buffer spring B513 in the elastic telescopic rod 51 is also extruded, the inclined telescopic rod 52 is deflected to assist the upward rotation of the bulldozing blade 3 to make the avoidance action when the gear 43 is rotated by the rack 443 under the extrusion force, and the corresponding parts in the stabilizing mechanism 5 are reset to assist the bulldozing blade 3 to make the next stable avoidance action on the large hard object after the bulldozing blade 3 passes the large hard object.

[0038] The overload protection mechanism of the bulldozing blade can make the bulldozing blade 3 more stable when making the avoidance action, thereby improving the stability of the whole mechanism.

[0039] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A bulldozer blade overload protection mechanism, comprising a U-shaped connecting beam (1), a lifting hydraulic cylinder (2) symmetrically hinged to the top of the U-shaped connecting beam (1), and a bulldozer blade (3) for bulldozing, characterized in that: Auxiliary mechanisms (4) for assisting the bulldozer blade (3) in making avoidance actions are symmetrically arranged between the U-shaped connecting beam (1) and the bulldozer blade (3). The auxiliary mechanism (4) includes two elastic telescopic ears (41) fixedly connected to the lower outside of the bulldozer blade (3). A fixed shaft (42) is fixedly connected between the two telescopic ears (41). A gear (43) is fixedly connected to the middle of the fixed shaft (42). An elastic telescopic rack (44) is arranged above the gear (43). The elastic telescopic rack (44) is located on the outside of the bulldozer blade (3). A stabilizing mechanism (5) for improving the connection stability of the bulldozer blade (3) is provided between the U-shaped connecting beam (1) and the bulldozer blade (3). The stabilizing mechanism (5) includes an elastic telescopic rod (51) fixedly connected to the upper part of the bulldozer blade (3). An inclined telescopic rod (52) hinged to the middle part of the U-shaped connecting beam (1) is provided on the outside of the elastic telescopic rod (51). The elastic telescopic rack (44) includes a fixing plate (441) fixedly connected to the top of the U-shaped connecting beam (1). A fixing rod (442) is fixedly connected to the outside of the fixing plate (441). A rack (443) that meshes with the gear (43) is slidably connected to the outside of the fixing rod (442).

2. The overload protection mechanism for a bulldozer blade according to claim 1, characterized in that: Both of the telescopic ears (41) include an inner ear (411) fixedly connected to the lower part of the outside of the bulldozer blade (3). An outer ear (412) is slidably connected to the outside of the inner ear (411). A buffer spring A (413) is fixedly connected to the inside of the outer ear (412) and fixedly connected to the end of the inner ear (411). The two ends of the fixed shaft (42) are fixedly connected between the two outer ears (412).

3. The overload protection mechanism for a bulldozer blade according to claim 2, characterized in that: The auxiliary mechanism (4) further includes a connecting seat A (45) for connecting the U-shaped connecting beam (1) and the two outer ears (412). One side of the connecting seat A (45) is fixedly connected to the outer side of the U-shaped connecting beam (1), and the other side of the connecting seat A (45) is provided with a groove (46). The inner side of the groove (46) is symmetrically rotatably connected to a rotating shaft (47), and the two outer ears (412) are rotatably connected between the two rotating shafts (47).

4. The overload protection mechanism for a bulldozer blade according to claim 3, characterized in that: The bottom of the connecting seat A (45) is fixedly connected to a U-shaped limiting plate (48), and the bottom of the two outer ear (412) is in contact with the top of the U-shaped limiting plate (48).

5. The overload protection mechanism for a bulldozer blade according to claim 1, characterized in that: A return spring (444) sleeved on the outside of the fixed rod (442) is fixedly connected between the fixed plate (441) and the rack (443).

6. The overload protection mechanism for a bulldozer blade according to claim 1, characterized in that: The elastic telescopic rod (51) includes an inner rod (511) fixedly connected above the outside of the bulldozer blade (3), an outer rod (512) slidably connected to the outside of the inner rod (511), and a buffer spring B (513) fixedly connected to the end of the inner rod (511) inside the outer rod (512).

7. The overload protection mechanism for a bulldozer blade according to claim 6, characterized in that: The outer sleeve (512) and the inclined telescopic rod (52) are both fixedly connected to one end of each other with a sleeve (53), and the two sleeves (53) are rotatably connected to a shaft (54), and the two ends of the two shafts (54) are fixedly connected to a connecting lug (55).

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