Swing mechanism automatic lubricating device, control method and engineering machinery

Abstract

The invention discloses a slewing mechanism automatic lubricating device, a control method and engineering machinery. The slewing mechanism automatic lubricating device comprises an oil tank, a filling device, a one-way conduction component and a controller. The oil tank is used for storing grease; the filling device is connected with the oil tank and a lubricating point of the slewing bearing through guide pipes, and lubricating grease is conveyed to the slewing bearing through the filling device; the one-way conducting component is connected in the guide pipe in series, and the connection relation among the one-way conducting component, the filling device and the oil tank is as follows: when the filling device conveys lubricating grease to a lubricating point of the slewing bearing, a passage, leading to the oil tank, of the filling device is in a closed state; when the lubricating grease in the oil tank is input into the filling device, a passage from the filling device to a lubricating point of the slewing bearing is in a closed state; the controller is electrically connected with the filling device and judges whether the filling device needs to be started to add lubricating grease or not according to the working duration of the whole machine. The invention is beneficial to timely supplement of grease for the meshing gear of the slewing mechanism, and avoids lack of grease caused by omission due to artificial reasons.

Description

Technical Field

[0001] The present invention relates to an automatic lubrication device for a slewing mechanism, which is applied to realize the electric control automation of the lubrication of the gear pair of the slewing mechanism of an excavator and belongs to the technical field of construction machinery. Background Art

[0002] The slewing function is a basic function of an excavator. This function is realized by the rotation of the pinion at the output end of the slewing motor to drive the large gear of the slewing bearing. In order to extend the service life, lubricating grease, i.e., grease, is required to lubricate the gear pair.

[0003] There are usually two lubrication schemes for the existing excavator slewing mechanism. The first is used for medium and large excavators: an annular grease reservoir is installed on the lower carriage. The grease reservoir can store a certain amount of grease. After the slewing bearing and the slewing motor are installed, the gear part is located in the grease reservoir filled with grease to achieve the lubrication function. Since the top of the grease reservoir is open, the grease will occasionally overflow under the agitation of the gear during the slewing operation, resulting in loss. Usually, a filling port is reserved on the upper carriage platform, and grease is manually supplemented into the grease reservoir through the filling port regularly. The second is used for mini and micro excavators: Due to the small space, mini and micro excavators usually do not have a grease reservoir. Usually, an oil pipe is led out through an opening at the meshing teeth on the upper carriage and connected to the oil cup at the front end of the excavator. The grease is filled regularly with a grease gun. The grease flows directly onto the teeth through the oil pipe and the opening above the gear.

[0004] The grease in the grease reservoirs of the slewing mechanisms of the above two types of excavators is filled manually according to the set maintenance cycle time. However, manual filling has the following disadvantages: 1. Manual addition by workers is required, which increases the complexity of maintenance.

[0005] 2. Manual operation is prone to omission or neglect due to human factors, resulting in untimely addition. Especially for mini and micro excavators without a grease reservoir, it is very easy to cause excessive wear of the gears due to the lack of timely addition of grease.

[0006] 3. Mini and micro excavators do not have a grease reservoir and need to be filled in a stopped state. The newly added grease will quickly slide down under the action of gravity, resulting in insufficient effective amount of added grease and waste of grease. Summary of the Invention

[0007] In view of the problems existing in the above-mentioned prior art, the present invention provides an automatic lubrication device for a slewing mechanism, which is beneficial to the timely replenishment of lubricating grease for the meshing gears of the slewing mechanism and avoids the lack of lubricating grease caused by human omission. It can also realize the adjustment of lubrication effect, lubrication interval and dosage, and is convenient to freely adjust according to factors such as working conditions and environment.

[0008] The present invention is implemented according to the following technical solutions: In a first aspect, the present invention provides an automatic lubrication device for a slewing mechanism, comprising: An oil tank for storing grease; A filling device which is connected to the oil tank and the lubrication points of the slewing bearing respectively through a conduit, and conveys the grease to the slewing bearing through the filling device; A one-way conduction component connected in series in the conduit. The connection relationship between the one-way conduction component and the filling device and the oil tank is as follows: when the filling device conveys grease to the lubrication points of the slewing bearing, the passage from the filling device to the oil tank is in a closed state; when the grease in the oil tank is input into the filling device, the passage from the filling device to the lubrication points of the slewing bearing is in a closed state; A controller electrically connected to the filling device, and the controller determines whether to activate the filling device to add grease according to the working duration of the whole machine.

[0009] In some embodiments, the filling device comprises: A circular cylinder with one axial end face open and the other axial end face closed and hollow. A through hole is provided at the radial peripheral surface of the circular cylinder near the closed axial end face, and the through hole is connected to the conduit, and this through hole serves as the inlet and outlet of the grease; A piston assembly composed of a piston rod and a piston head integrally formed or fixedly connected; the piston head is arranged in the circular cylinder, and a sealing component is provided between the opposite peripheral surfaces of the two; A power component and a transmission component. The power component is connected to the piston assembly through the transmission component, and after providing power to the piston assembly, it enables the piston assembly to perform linear reciprocating movement in the circular cylinder; when the piston assembly moves towards the through hole, the piston head presses the grease in the circular cylinder and flows out through the through hole, and then flows through the conduit to the lubrication points of the slewing bearing; when the piston assembly moves away from the through hole, the grease in the oil tank is sucked into the circular cylinder through the conduit and the through hole.

[0010] In some embodiments, the conduit is an overall Y-shaped structure, composed of a main pipeline and two branch pipelines connected to each other; the end of the main pipeline is fixed together with the through hole, the end of one branch pipeline is fixed together with the oil tank, and the end of the other branch pipeline is fixed together with the lubrication points of the slewing bearing; the one-way conduction component is connected in series in the two branch pipelines.

[0011] In some embodiments, the one-way conduction component adopts a two-way one-way valve, which is composed of two one-way valves; the conduction direction of one one-way valve is from the circular cylinder to the lubrication points of the slewing bearing, and the conduction direction of the other one-way valve is from the oil tank to the circular cylinder.

[0012] In some embodiments, the transmission component adopts a gear meshing method for transmission, and it comprises: A piston gear is sleeved on the piston rod and can rotate circumferentially on the circular cylinder body; the inner hole of the piston gear is a threaded hole, and the piston rod is an external threaded rod, and the two are connected by threads for transmission; The power gear is connected to the power component and meshes with the piston gear. After the power component rotates, the piston gear is driven to rotate circumferentially through the power gear. Under the action of the transmission thread, the circumferential rotational motion of the piston gear is converted into axial linear motion of the piston assembly.

[0013] In some embodiments, the bottom surface of the piston gear is provided with an outwardly convex accommodating cavity, and a bearing is installed between the accommodating cavity and the circumferential surface facing the circular cylinder body, so that the piston gear can rotate circumferentially relative to the circular cylinder body.

[0014] In some embodiments, the upper area of the circular cylinder body is set as a stepped structure, and the inner ring of the bearing is mounted on the upper area of the circular cylinder body in a tight fit manner, and the step in the upper area constitutes a lower stop to axially limit the inner ring of the bearing; the circular cylinder body protrudes from the bearing, and a circle of grooves is provided on the outer circumferential surface of the protruding part, and a retaining ring is clamped in the groove, and the retaining ring is fitted together with the inner ring of the bearing to axially limit the inner ring of the bearing; the accommodating cavity is set as a stepped structure, and the accommodating cavity is mounted on the outer ring of the bearing in a tight fit manner, and the step in the accommodating cavity constitutes an upper stop to axially limit the inner ring of the bearing; the accommodating cavity protrudes from the bearing, and a circle of grooves is provided on the inner circumferential surface of the protruding part, and a retaining ring is clamped in the groove, and the retaining ring is fitted together with the outer ring of the bearing to axially limit the outer ring of the bearing.

[0015] In some embodiments, the power component is a driving motor, the casing of the driving motor is fixed to the upper part of the motor bracket, the power gear is mounted on the output shaft of the driving motor, and can rotate circumferentially following the output shaft; the lower part of the motor bracket is fixed to the base plate, and the base plate and the circular cylinder body are integrally formed or welded to form a cylinder body seat.

[0016] In some embodiments, the inner hole of the power gear and the output shaft of the driving motor are connected by a spline to limit the circumferential relative rotation between the two; the output shaft is provided with a circle of grooves near the top surface of the power gear, and a retaining ring is clamped in the groove. The retaining ring is fitted together with the power gear to limit the axial movement of the power gear.

[0017] In some embodiments, a counting component is also included. The counting component is installed on the rotating platform and is electrically connected to the controller. After receiving the rotation circle data collected by the counting component, the controller can accurately calculate the rotation workload of the slewing bearing, and then set a precise grease filling interval time for the filling device.

[0018] Counting component: The counting component uses a rotary encoder, which includes an encoder body, an encoder mounting plate, and an encoder drive gear. The encoder body is fixed on the rotary platform through the encoder mounting plate, and the encoder body is connected to the controller through a wire harness. The inner hole of the encoder drive gear is fixedly connected to the output shaft of the encoder body, and the encoder drive gear meshes with the inner ring gear of the slewing bearing. The rotary encoder transmits the number of rotations it collects to the controller, and the controller calculates the number of rotations of the slewing bearing based on the tooth number ratio of the encoder drive gear and the inner ring gear of the slewing bearing, and then obtains the slewing operation amount of the slewing bearing.

[0019] Counting component: A rotary motor is installed on the rotary platform, and the gear at the output end of the rotary motor meshes with the inner ring gear of the slewing bearing. The lubrication point of the slewing bearing is the inner ring gear of the slewing bearing or the grease sump below the slewing bearing.

[0020] Counting component: The filling device, the one-way conduction component, and the controller are integrated together to form an independent component with a reserved interface.

[0021] In a second aspect, the present invention provides a construction machinery, including the above-mentioned automatic lubrication device for the slewing mechanism.

[0022] In a third aspect, the present invention provides a control method based on the above-mentioned automatic lubrication device for the slewing mechanism. The control method is as follows: Select the working mode of automatic grease filling: It is divided into an automatic grease filling mode according to the working duration of the whole machine and an automatic grease filling mode according to the number of rotations obtained by the counting component. When the controller detects that the preset working duration of the whole machine or the number of rotations of the slewing bearing set has been reached, the controller turns on the filling device and selects the operating mode. Operating mode 1: The filling device conveys grease to the lubrication point of the slewing bearing. After filling for a preset time, the grease conveying stops, and the filling device enters operating mode 2. Operating mode 2: The filling device sucks the grease in the fuel tank into its own cylinder body for storing the grease used in the next filling process.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides an automatic lubrication device for the slewing mechanism, which can automatically fill grease according to the slewing workload of the excavator, eliminating insufficient lubrication caused by human factors. And it realizes filling while the excavator is working. The newly filled grease can be lubricated to each tooth in time under the drive of the slewing operation, with good lubrication effect and grease saving. Especially, it has a better improvement effect on micro and small excavators without a grease sump. Description of the drawings

[0024] The accompanying drawings, as part of the present invention, are used to provide further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention, but do not unduly limit the present invention. Obviously, the accompanying drawings in the following description are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0025] In the accompanying drawings: Figure 1 is the structure of the automatic lubrication device for the slewing mechanism of the present invention Figure 1 ; Reference numerals in the drawings: 1, rotary encoder; 2, slewing platform; 3, controller; 4, two-way check valve; 5, grease tank; 6, filling device.

[0026] Figure 2 is the structure of the automatic lubrication device for the slewing mechanism of the present invention Figure 2 (hiding the slewing platform); Reference numeral in the drawings: 7, slewing bearing.

[0027] Figure 3 is the structural diagram of the rotary encoder of the present invention; Reference numerals in the drawings: 1-1, encoder main body; 1-2, encoder mounting plate; 1-3, encoder drive gear.

[0028] Figure 4 is the structural diagram of the filling device of the present invention; Reference numerals in the drawings: 6-1, motor bracket; 6-2, driving gear; 6-3, piston gear; 6-4, piston assembly; 6-5, cylinder block seat; 6-6, servo motor.

[0029] Figure 5 is the sectional view of the filling device of the present invention; Reference numerals in the drawings: 6-1, motor bracket; 6-2, driving gear; 6-3, piston gear; 6-4, piston assembly; 6-5, cylinder block seat; 6-6, servo motor; 6-7, retaining ring; 6-8, bearing; 6-9, retaining ring; 6-10, wear-resistant ring; 6-11, O-ring.

[0030] Figure 6 is the flowchart of the control method of the automatic lubrication device for the slewing mechanism of the present invention.

[0031] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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 should not be construed as a limitation to the present invention.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] As Figure 1 、 Figure 2 shown, the present invention provides a rotary mechanism automatic lubrication device, which includes a grease tank 5, a filling device 6, a one-way conduction component, a controller 3 and a counting component; the grease tank 5 is used to store lubricating grease (preferably grease); the filling device 6 is respectively connected to the grease tank 5 and the lubrication points of the slewing bearing 7 through conduits, and the grease is conveyed to the slewing bearing 7 through the filling device 6; the one-way conduction component is connected in series in the conduit, and the connection relationship between the one-way conduction component and the filling device 6 and the grease tank 5 is: when the filling device conveys grease to the lubrication points of the slewing bearing, the passage of the filling device leading to the grease tank 5 is in a closed state; when the grease in the grease tank 5 is input into the filling device 6, the passage of the filling device 6 leading to the lubrication points of the slewing bearing 7 is in a closed state; the counting component is installed on the slewing platform 2, the controller 3 is electrically connected to the counting component and the filling device 6, and after receiving the rotation circle number data collected by the counting component, the controller 3 can accurately calculate the slewing operation amount of the slewing bearing 7, and then set an accurate grease filling interval time for the filling device 6.

[0036] As can be seen from the above, the present invention provides a rotary mechanism automatic lubrication device, which can automatically fill grease (lubricating grease) according to the slewing workload of the excavator, eliminating insufficient lubrication caused by human factors. And it realizes filling while the excavator is working. The newly filled grease can be lubricated to each tooth in time under the drive of the slewing operation, with good lubrication effect and saving grease, especially having a better improvement effect on micro-miniature excavators without a grease sump.

[0037] It should be noted that the slewing platform 2 is a structural member of the vehicle (which can be an excavator) for installing various components except the chassis. The slewing bearing 7 is a bearing connecting the upper and lower parts of the vehicle (which can be an excavator). Usually, the inner ring is machined into a gear structure, meshing with the gear of the slewing motor, and driven by the slewing motor to realize the slewing operation function of the vehicle (which can be an excavator). The lubrication points of the slewing bearing 7 are the inner ring gear of the slewing bearing 7 or the grease sump below the slewing bearing 7.

[0038] The specific structure of the above-mentioned counting component will be further described below.

[0039] As Figure 3 shown, the counting component adopts a rotary encoder 1, which includes an encoder body 1-1, an encoder mounting plate 1-2 and an encoder drive gear 1-3; the encoder body 1-1 is fixed on the slewing platform 2 through the encoder mounting plate 1-2, and the encoder body 1-1 is connected to the controller 3 through a wire harness; the inner hole of the encoder drive gear 1-3 is fixedly connected to the output shaft of the encoder body 1-1, and the encoder drive gear 1-3 meshes with the inner ring gear of the slewing bearing 7; the rotary encoder 1 transmits the number of its own rotation turns to the controller 3, and the controller 3 calculates the number of rotation turns of the slewing bearing 7 according to the tooth number ratio of the encoder drive gear 1-3 and the inner ring gear of the slewing bearing 7, and then obtains the slewing operation amount of the slewing bearing 7.

[0040] It should be noted that in actual use, the rotary encoder 1 can be not used. The controller 3 judges whether to start the filling device 6 to add grease according to the total machine working time, which is applicable to medium and large excavators with a grease sump. This is because the grease will be stored in the grease sump. Different from the models without a grease sump, if the slewing action is not carried out in time to smear the grease on other teeth, the grease will drip under the action of gravity, resulting in very poor lubrication effect.

[0041] The specific structure of the above-mentioned filling device will be further described below.

[0042] As Figure 4 、 Figure 5As shown, the filling device 6 includes a circular cylinder body with an open axial end face and a closed and hollow other axial end face, a piston assembly 6-4, a power component and a transmission component; a through hole is provided on the radial circumferential surface of the circular cylinder body near the closed axial end face, the through hole is connected to a conduit, and the through hole is used as the entrance and exit of butter; the piston assembly 6-4 is composed of a piston rod and a piston head that are integrally formed or fixedly connected; the piston head is arranged in the circular cylinder body, and an O-ring 6-11 and a wear-resistant ring 6-10 are provided between the facing circumferential surfaces of the two; the power component is connected to the piston assembly 6-4 through the transmission component, and after power is provided to the piston assembly 6-4, it can be reciprocated linearly in the circular cylinder body; when the piston assembly 6-4 moves toward the through hole, the piston head presses the butter in the circular cylinder body to flow out from the through hole, and then flows to the lubrication point of the slewing bearing 7 through the conduit; when the piston assembly 6-4 moves away from the through hole, the butter in the butter box 5 is sucked into the circular cylinder body through the conduit and the through hole.

[0043] Further solutions, such as Figure 1 , Figure 2 As shown, the conduit is a Y-shaped structure as a whole, consisting of a connected main pipeline and two branch pipelines; the end of the main pipeline is fixed together with the through hole, the end of one branch pipeline is fixed together with the butter box 5, and the end of the other branch pipeline is fixed together with the lubrication point of the slewing bearing 7; the unidirectional conductive component is connected in series in each branch pipeline.

[0044] The preferred solution is that the one-way conducting component adopts a two-position one-way valve 4, which is composed of two one-way valves; the conducting direction of one of the one-way valves is from the circular cylinder body to the lubrication point of the slewing bearing 7, and the conducting direction of the other one-way valve is from the grease box 5 to the circular cylinder body.

[0045] The specific structure of the above-mentioned transmission component is further described below.

[0046] like Figure 4 , Figure 5 As shown, the transmission component adopts gear meshing to transmit, and includes a piston gear 6-3 and a power gear 6-2; the piston gear 6-3 is mounted on the piston rod, and the piston gear 6-3 can rotate circumferentially on the circular cylinder body; the inner hole of the piston gear 6-3 is a threaded hole, and the piston rod is an external threaded rod, and the two are transmitted through a threaded connection; the power gear 6-2 is connected to the power component and meshes with the piston gear 6-3. After the power component rotates, the piston gear 6-3 is driven to rotate circumferentially through the power gear 6-2, and under the action of the transmission thread, the circumferential rotational motion of the piston gear 6-3 is converted into the axial linear motion of the piston assembly 6-4.

[0047] Further solutions, such as Figure 5As shown, the bottom surface of the piston gear 6-3 is provided with an outwardly convex receiving cavity. A bearing 6-8 is installed between the circumferential surface of the receiving cavity facing the circular cylinder block, enabling the piston gear 6-3 to rotate circumferentially relative to the circular cylinder block.

[0048] A further solution is as Figure 5 shown. The upper region of the circular cylinder block is provided with a stepped structure. The inner ring of the bearing 6-8 is sleeved on the upper region of the circular cylinder block in a tight fit manner. The step of this upper region constitutes a lower stop, axially limiting the inner ring of the bearing 6-8. The circular cylinder block protrudes from the bearing 6-8. A groove is provided on the outer circumferential surface of this protruding part, and a retaining ring 6-9 is clamped in this groove. The retaining ring 6-9 is in contact with the inner ring of the bearing 6-8, axially limiting the inner ring of the bearing 6-8. The receiving cavity is provided with a stepped structure and is sleeved on the outer ring of the bearing 6-8 in a tight fit manner. The step in the receiving cavity constitutes an upper stop, axially limiting the inner ring of the bearing 6-8. The receiving cavity protrudes from the bearing 6-8. A groove is provided on the inner circumferential surface of this protruding part, and a retaining ring 6-7 is clamped in this groove. The retaining ring 6-7 is in contact with the outer ring of the bearing 6-8, axially limiting the outer ring of the bearing 6-8.

[0049] The specific structure of the above-mentioned power component will be further described below.

[0050] As Figure 4 、 Figure 5 shown, the power component is a servo motor 6-6. The housing of the servo motor 6-6 is fixed to the upper part of the motor bracket 6-1. The power gear 6-2 is sleeved on the output shaft of the servo motor 6-6 and can rotate circumferentially with the output shaft. The lower part of the motor bracket 6-1 is fixed to the bottom plate. The bottom plate is integrally formed or welded to the circular cylinder block to form a cylinder block seat 6-5.

[0051] A further solution is as Figure 4 、 Figure 5 shown. The inner hole of the power gear 6-2 and the output shaft of the servo motor 6-6 are connected by splines to restrict the circumferential relative rotation between the two. A groove is provided on the top surface of the output shaft near the power gear 6-2, and a retaining ring is clamped in this groove. The retaining ring is in contact with the power gear 6-2, restricting the axial movement of the power gear 6-2.

[0052] It should be noted that the above-mentioned power gear 6-2, piston gear 6-3, etc. can be made of materials such as nylon. This is because the filling operation load is extremely small, the requirements for gear materials are low, and using nylon, etc. can avoid lubrication and reduce costs. Metal gears with lubrication devices can also be used, which will not be elaborated here. Similarly, the bearing 6-8 between the piston assembly 6-4 and the cylinder block seat 6-5 can also use self-lubricating bearings, or an additional lubrication structure can be added, which will not be elaborated here.

[0053] In a further solution, the controller 3, the two-way check valve 4, and the filling device 6 can also be integrally designed into an independent component with reserved interfaces, which is convenient for large-scale production and reduces assembly complexity.

[0054] The working principle of the above-mentioned automatic lubrication device for a slewing mechanism is given below.

[0055] Mechanical transmission part: After receiving the command, the servo motor 6-6 starts. The positive rotation for N turns drives the driving gear 6-2 to rotate. The driving gear 6-2 drives the piston gear 6-3 to rotate. The transmission thread inside the piston gear 6-3 drives the piston assembly 6-4 to move downward, squeezing the grease in the cylinder block seat 6-5 into the pipeline. It overflows through the two-way check valve 4 and drips onto the teeth and into the grease sump (for the model with a grease sump) from the outlet installed above the gear of the slewing bearing 7. At this time, the passage to the grease tank 5 is in a closed state. After the servo motor 6-6 rotates forward for N turns, it continues to rotate backward for N turns. Similarly, the piston assembly 6-4 can be reset to the initial position upward. At this time, the grease in the grease tank 5 will be sucked into the cylinder block seat 6-5 through the two-way check valve 4 and the pipeline. At this time, the passage to the slewing bearing 7 inside the two-way check valve 4 is in a closed state, thus completing an operation cycle.

[0056] Electrical control part: The controller 3 is connected to the rotary encoder 1 and the servo motor 6-6. While supplying power to them, it receives the rotation data collected by the rotary encoder 1, calculates the working duration of the slewing bearing 7 based on the data, and decides whether grease needs to be added. If grease needs to be added, it controls the forward and reverse rotation of the servo motor 6-6 to complete the operation cycle of grease addition.

[0057] As can be seen from the above, the present invention can accurately feedback the slewing operation amount by using the rotary encoder to read the rotation turns and reasonably set the filling interval. The present invention realizes the reset cycle by accurately controlling the rotation turns of the servo motor. The present invention automatically replenishes the lubricating grease in the cylinder body by using the working principle of the hydraulic check valve.

[0058] In summary, the present invention provides an automatic lubrication device for a slewing mechanism, achieving the following functions and effects: (1) There is no need to manually add grease frequently, especially for small and micro excavators without a grease sump, reducing the maintenance complexity.

[0059] (2) It avoids the omission or inattention caused by human factors resulting in untimely addition, especially for small and micro excavators without a grease sump, which is likely to cause excessive gear wear due to untimely grease addition.

[0060] (3) It can achieve automatic lubricating oil filling without stopping the machine, enabling timely lubrication of the grease to every tooth of the micro-mini excavator without a grease sump, thus avoiding grease waste and poor filling effect caused by gravity factors.

[0061] Figure 6 A control method for the automatic lubrication device of the slewing mechanism based on the above is given. The control method is as follows: Select the working mode of automatic grease injection: It is divided into the automatic grease injection mode according to the total machine working duration and the automatic grease injection mode according to the number of rotation circles obtained by the slewing encoder. When the controller detects that the preset total machine working duration or the preset number of rotation circles of the slewing bearing has been reached, the controller turns on the filling device and selects the operating mode. Operating mode 1: The filling device conveys grease to the lubrication points of the slewing bearing. After filling for the preset time, it stops conveying grease, and the filling device enters operating mode 2. Operating mode 2: The filling device sucks the grease in the fuel tank into its own cylinder body for storing the grease used in the next filling process.

[0062] The construction machinery provided by the present invention is described below. The construction machinery described below can be mutually referred to corresponding to the automatic lubrication device of the slewing mechanism described above.

[0063] A construction machinery provided by the present invention may include the automatic lubrication device of the slewing mechanism as described in any one of the above embodiments.

[0064] The beneficial effects achieved by the construction machinery provided by the present invention are consistent with those achieved by the automatic lubrication device of the slewing mechanism provided by the present invention, so they will not be elaborated here.

[0065] It should be noted that the above construction machinery can be an excavator; of course, in addition to being used in the field of construction machinery, the present invention can also be used in agricultural machinery.

[0066] In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0067] In addition, those skilled in the art can understand that although some of the embodiments described herein include certain features contained in other embodiments rather than other features, the combination of the features of different embodiments also means being within the protection scope of the present invention and forms different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0068] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, within the scope of the technical solution of the present invention, can make some changes or modifications using the technical content prompted above to form equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the present invention's solution.

Claims

1. An automatic lubrication device for a slewing mechanism, characterized in that, Comprising: An oil tank for storing grease; A filling device which is connected to the grease storage tank and the lubrication points of the slewing bearing respectively through a conduit, and conveys grease to the slewing bearing through the filling device; A one-way conduction component connected in series in the conduit. The connection relationship between the one-way conduction component and the filling device and the oil tank is as follows: when the filling device conveys grease to the lubrication points of the slewing bearing, the passage from the filling device to the oil tank is in a closed state; when the grease in the oil tank is input into the filling device, the passage from the filling device to the lubrication points of the slewing bearing is in a closed state; A controller electrically connected to the filling device, and the controller determines whether to activate the filling device to add grease according to the operating duration of the whole machine.

2. The automatic lubrication device for a slewing mechanism according to claim 1, characterized in that, The filling device includes: A circular cylinder with an open axial end face and a closed axial end face and being hollow. A through hole is provided at a position on the radial circumferential surface of the circular cylinder near the closed axial end face, and the through hole is connected to the conduit, and this through hole serves as the inlet and outlet of grease; A piston assembly composed of a piston rod and a piston head integrally formed or fixedly connected; the piston head is arranged in the circular cylinder, and a sealing component is provided between the opposing circumferential surfaces of the two; A power component and a transmission component. The power component is connected to the piston assembly through the transmission component. After providing power to the piston assembly, it enables the piston assembly to perform linear reciprocating movement in the circular cylinder; when the piston assembly moves towards the through hole, the piston head presses the grease in the circular cylinder to flow out through the through hole, and then flows through the conduit to the lubrication points of the slewing bearing; when the piston assembly moves away from the through hole, the grease in the oil tank is sucked into the circular cylinder through the conduit and the through hole.

3. An automatic lubrication device for a slewing mechanism according to claim 2, wherein: The conduit is of an overall Y-shaped structure, and is composed of a main pipeline and two branch pipelines connected to each other; the end of the main pipeline is fixed together with the through hole, the end of one branch pipeline is fixed together with the oil tank, and the end of the other branch pipeline is fixed together with the lubrication points of the slewing bearing; The one-way conduction component is connected in series in the two branch pipelines.

4. An automatic lubrication device for a slewing mechanism according to claim 3, wherein: The one-way conduction component adopts a two-way one-way valve, which is composed of two one-way valves; the conduction direction of one one-way valve is from the circular cylinder to the lubrication points of the slewing bearing, and the conduction direction of the other one-way valve is from the oil tank to the circular cylinder.

5. The automatic lubrication device for a slewing mechanism according to claim 2, characterized in that, The transmission component is driven by a gear meshing method, and includes: A piston gear sleeved on the piston rod, and the piston gear can rotate circumferentially on the circular cylinder; the inner hole of the piston gear is a threaded hole, and the piston rod is an external threaded rod, and the two are driven by screw connection; A power gear connected to the power component and meshing with the piston gear. After the power component rotates, the piston gear is driven to rotate circumferentially by the power gear, and under the action of the transmission thread, the circumferential rotational movement of the piston gear is converted into the axial linear movement of the piston assembly.

6. An automatic lubrication device for a slewing mechanism according to claim 5, wherein: The bottom surface of the piston gear is provided with a convex receiving cavity, and a bearing is installed between the circumferential surface of the receiving cavity facing the circular cylinder body, so that the piston gear can rotate circumferentially relative to the circular cylinder body.

7. The automatic lubrication device for a slewing mechanism according to claim 6, characterized in that: The upper region of the circular cylinder body is provided with a stepped structure. The inner ring of the bearing is sleeved on the upper region of the circular cylinder body in a tight fit manner. The step of this upper region constitutes a lower stop to axially limit the inner ring of the bearing; the circular cylinder body protrudes from the bearing, and a groove is provided on the outer circumferential surface of this protruding part. A retaining ring is clamped in this groove, and the retaining ring is attached to the inner ring of the bearing to axially limit the inner ring of the bearing; The receiving cavity is provided with a stepped structure. The receiving cavity is sleeved on the outer ring of the bearing in a tight fit manner. The step in the receiving cavity constitutes an upper stop to axially limit the inner ring of the bearing; the receiving cavity protrudes from the bearing, and a groove is provided on the inner circumferential surface of this protruding part. A retaining ring is clamped in this groove, and the retaining ring is attached to the outer ring of the bearing to axially limit the outer ring of the bearing.

8. The automatic lubrication device for a slewing mechanism according to claim 2, characterized in that: The power component is a driving motor. The housing of the driving motor is fixed on the upper part of the motor bracket. The power gear is sleeved on the output shaft of the driving motor and can rotate circumferentially along with the output shaft; The lower part of the motor bracket is fixed on the bottom plate, and the bottom plate is integrally formed or welded with the circular cylinder body to form a cylinder seat.

9. The automatic lubrication device for a slewing mechanism according to claim 8, characterized in that: The inner hole of the power gear and the output shaft of the driving motor are connected by splines to restrict the circumferential relative rotation between the two; a groove is provided on the top surface of the output shaft near the power gear, and a retaining ring is clamped in this groove. The retaining ring is attached to the power gear to restrict the axial movement of the power gear.

10. The automatic lubrication device for a slewing mechanism according to claim 1, characterized in that, It further includes: A counting component, installed on the slewing platform and electrically connected to the controller. After receiving the rotation cycle data collected by the counting component, the controller can accurately calculate the slewing operation amount of the slewing bearing, and then set an accurate grease filling interval time for the filling device.

11. The automatic lubrication device for a slewing mechanism according to claim 10, characterized in that: The counting component adopts a rotary encoder, which includes an encoder body, an encoder mounting plate and an encoder driving gear; The encoder body is fixed on the slewing platform through the encoder mounting plate, and the encoder body is connected to the controller through a wire harness; the inner hole of the encoder driving gear is fixedly connected to the output shaft of the encoder body, and the encoder driving gear meshes with the inner ring gear of the slewing bearing; The rotary encoder transmits the rotation cycle collected by itself to the controller. The controller calculates the rotation cycle of the slewing bearing according to the tooth number ratio of the encoder driving gear and the inner ring gear of the slewing bearing, and then obtains the slewing operation amount of the slewing bearing.

12. An automatic lubrication device for a slewing mechanism according to claim 1, wherein: A slewing motor is installed on the slewing platform, and the gear at the output end of the slewing motor meshes with the inner ring gear of the slewing bearing; The lubrication points of the slewing bearing are the inner ring gear of the slewing bearing or the grease sump below the slewing bearing.

13. An automatic lubrication device for a slewing mechanism according to claim 1, wherein: The filling device, the one-way conduction component and the controller are integrated together to form an independent component with a reserved interface.

14. A construction machinery, characterized in that: It includes the automatic lubrication device for the slewing mechanism according to any one of claims 1 to 13.

15. A control method for an automatic lubrication device of a slewing mechanism according to claim 10, characterized in that, The control method is as follows: Select the working mode of automatic grease filling: it is divided into the automatic grease filling mode according to the working duration of the whole machine and the automatic grease filling mode according to the number of rotation turns obtained by the counting component; When the controller detects that the preset working duration of the whole machine or the number of rotation turns of the slewing bearing set has been reached, the controller activates the filling device and selects the operating mode; Operating mode 1: The filling device conveys grease to the lubrication point of the slewing bearing, stops conveying grease after a preset filling time, and the filling device enters operating mode 2; Operating mode 2: The filling device sucks the grease in the fuel tank into its own cylinder body for storing the grease used in the next filling process.

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