Driving rake operation low-rotating-speed automatic combination cam type load adjustable overload protection device

Abstract

The invention relates to a driving rake operation low-rotation-speed automatic combination cam type load-adjustable overload protection device which comprises a spline shaft sleeve, a clutch shell, a cam pin, a cam wear-resistant sleeve, an oil baffle pad, an elastic check ring, a sealing cover and a disc spring assembly. A cam pin is installed on the inner wall of one side of the clutch shell in a meshed mode, a cam abrasion-resistant sleeve is installed on the inner wall of one side of the clutch shell, one side of the cam abrasion-resistant sleeve is connected to the outer wall of the cam pin in an attached mode, and an oil blocking pad is installed on the inner wall of one side of the clutch shell. Impact force borne by the rake teeth can be effectively unloaded, after overload protection, the rotating speed is reduced, the cam can automatically return, it is guaranteed that power devices such as the rake teeth, a transmission shaft, a gear box and a tractor are not damaged, replacement cost and time cost are not increased, and operation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of agriculture, and in particular to an overload protection device capable of automatically combining a cam-type load adjustment with a low-speed driving harrow operation. Background Art

[0002] Before planting, the hard soil layer needs to be leveled and broken. The current soil environment is complex, and there are many sundries in the soil, such as tree roots and various stones after returning forests to farmland. If the driving harrow encounters large tree roots and stones during the land leveling process, it is easy to lock the harrow box, thereby impacting the harrow teeth, drive shaft, gear box and tractor power unit, causing irreversible damage to the harrow teeth, drive shaft, gear box and tractor. The replacement cost after these damages is high, which wastes time. The planting operation time is time-sensitive, and the time cost is extremely high.

[0003] Currently, there are drive shafts with safety bolts on the market. The load of this device is not adjustable, which causes limitations. When the rake teeth of this device are locked and impacted, the safety bolts break and need to be replaced before normal operation can be carried out. This device requires the replacement of the safety bolts, which increases the replacement cost and wastes time, and the load cannot be adjusted. Summary of the invention

[0004] The problem solved by the present invention is to provide a low-speed automatic overload protection device combined with a cam-type load-adjustable driving rake operation, which can effectively unload the impact force on the rake teeth, and after the overload protection, the speed is reduced to enable the cam to automatically return to its position, thereby ensuring that the rake teeth, transmission shafts, gear boxes, tractors and other power devices are not damaged, and does not cause an increase in replacement costs and time costs, thereby improving operating efficiency.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a low-speed automatic overload protection device for driving a rake operation combined with a cam-type load-adjustable overload protection device, comprising a spline sleeve, a clutch housing, a cam pin, a cam wear-resistant sleeve, an oil retaining pad, an elastic retaining ring, a sealing cover and a disc spring assembly, a clutch housing is installed on one outer wall of the spline sleeve, a cam pin is meshingly installed on one inner wall of the clutch housing, a cam wear-resistant sleeve is installed on one inner wall of the clutch housing, and one side of the cam wear-resistant sleeve is fitted and connected to the outer wall of the cam pin, an oil retaining pad is installed on one inner wall of the clutch housing, and the oil retaining pad is installed on the outer wall of the spline sleeve, an elastic retaining ring is fitted on one outer wall of the oil retaining pad, and the elastic retaining ring is installed on the outer wall of the spline sleeve, a sealing cover is installed on one inner wall of the clutch housing, and one side of the sealing cover is installed on the outer wall of the spline sleeve, and a disc spring assembly is installed in the cam pin.

[0006] Preferably, the disc spring assembly includes a disc spring tensioning screw, a tensioning disc spring, a tensioning cam pin clip, a disc spring locking nut and an elastic cylindrical pin, the cam pin being installed in the disc spring tensioning screw, and one end of the disc spring tensioning screw being fitted on the outer wall of the spline sleeve, the tensioning cam pin clip being symmetrically sleeved on the outer wall of one side of the disc spring tensioning screw, the tensioning disc spring being distributed and sleeved on the outer wall of one side of the disc spring tensioning screw, one side of the tensioning disc spring being located on the outer walls on both sides of the tensioning cam pin clip, the outer wall of the disc spring tensioning screw being located on one side of the tensioning disc spring being threadedly connected with a disc spring locking nut, and an elastic cylindrical pin being inserted in the disc spring locking nut.

[0007] Preferably, one side of the spline sleeve is threadedly connected with a limiting bolt.

[0008] Preferably, a groove is provided on one side of the disc spring tensioning screw, and one side of the elastic cylindrical pin passes through the interior of the disc spring tensioning screw.

[0009] The beneficial effects of the present invention are: it can effectively unload the impact force on the rake teeth, and after overload protection, the rotation speed is reduced to enable the cam to automatically return to its position, thereby ensuring that the rake teeth, transmission shafts, gear boxes, tractors and other power devices are not damaged, and does not cause an increase in replacement costs and time costs, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is the overall three-dimensional structure diagram of the present invention;

[0011] Figure 2 It is a front view cutaway structural diagram of the present invention;

[0012] Figure 3 It is a front view structural diagram of the disc spring assembly of the present invention;

[0013] Figure 4 It is an exploded structural diagram of the disc spring assembly of the present invention;

[0014] Figure 5 It is a three-dimensional structural diagram of the interior of the clutch housing of the present invention.

[0015] Legend:

[0016] 1. Splined shaft sleeve; 2. Clutch housing; 3. Cam pin; 4. Cam wear-resistant sleeve; 5. Oil retaining pad; 6. Elastic retaining ring; 7. Sealing cover; 8. Limit bolt; 9. Disc spring assembly; 10. Disc spring tensioning screw; 11. Tensioning disc spring; 12. Tensioning cam pin clip; 13. Disc spring locking nut; 14. Elastic cylindrical pin. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Specific examples are given below.

[0019] See also Figure 1 to Figure 5 A low-speed automatic cam-type load-adjustable overload protection device for driving a harrow comprises a spline sleeve 1, a clutch housing 2, a cam pin 3, a cam wear-resistant sleeve 4, an oil retaining pad 5, an elastic retaining ring 6, a sealing cover 7, a limit bolt 8, a disc spring assembly 9, a disc spring tensioning screw 10, a tensioning disc spring 11, a tensioning cam pin clip 12, a disc spring locking nut 13, and an elastic cylindrical pin 14. A clutch housing 2 is installed on one side of the outer wall of the spline sleeve 1, and a cam pin 3 is meshingly installed on one side of the inner wall of the clutch housing 2. The clutch housing A cam wear-resistant sleeve 4 is installed on the inner wall of one side of the clutch housing 2, and one side of the cam wear-resistant sleeve 4 is fitted and connected to the outer wall of the cam pin 3, an oil retaining pad 5 is installed on the inner wall of one side of the clutch housing 2, and the oil retaining pad 5 is installed on the outer wall of the spline shaft sleeve 1, an elastic retaining ring 6 is fitted on the outer wall of one side of the oil retaining pad 5, and the elastic retaining ring 6 is installed on the outer wall of the spline shaft sleeve 1, a sealing cover 7 is installed on the inner wall of one side of the clutch housing 2, and one side of the sealing cover 7 is installed on the outer wall of the spline shaft sleeve 1, and a disc spring assembly 9 is installed in the cam pin 3;

[0020] The disc spring assembly 9 includes a disc spring tensioning screw 10, a tensioning disc spring 11, a tensioning cam pin clip 12, a disc spring locking nut 13 and an elastic cylindrical pin 14. The disc spring tensioning screw 10 is installed in the cam pin 3, and one end of the disc spring tensioning screw 10 is fitted on the outer wall of the spline sleeve 1. The tensioning cam pin clip 12 is symmetrically sleeved on the outer wall of one side of the disc spring tensioning screw 10. The tensioning disc spring 11 is distributed and sleeved on the outer wall of one side of the disc spring tensioning screw 10. One side of the tensioning disc spring 11 is located on the outer walls of both sides of the tensioning cam pin clip 12. The outer wall of the disc spring tensioning screw 10 on one side of the tensioning disc spring 11 is threadedly connected with a disc spring locking nut 13, and the disc spring locking nut 13 is inserted into the disc spring locking nut 13. There is an elastic cylindrical pin 14; it is tightened by 6 tensioning disc springs 11, and then the overload torque of the overload protection device is increased by adjusting the distance between the disc spring locking nut 13 and the disc spring tensioning screw 10, and then the disc spring tensioning screw 10 is prevented from retreating by the elastic cylindrical pin 14, so as to avoid the disc spring locking nut 13 from loosening due to the increase of pressure after overload, resulting in a decrease in overload torque. If the overload torque is too small, frequent overload will be caused; a groove is provided on one side of the disc spring tensioning screw 10, and one side of the elastic cylindrical pin 14 runs through the inside of the disc spring tensioning screw 10, and the disc spring tensioning screw 10 is prevented from retreating by the elastic cylindrical pin 14, so as to avoid the disc spring locking nut 13 from loosening due to the increase of pressure after overload;

[0021] One side of the spline sleeve 1 is threadedly connected with a limiting bolt 8, so that the spline sleeve 1 can be installed on the clutch housing 2, so that the spline sleeve 1 can be driven to rotate by the cam pin 3.

[0022] Working principle: When the tractor power output is engaged, the tractor power output drives the transmission shaft to rotate, and drives the clutch housing 2 to rotate through the transmission shaft; when the transmission shaft operates normally, the cam pin 3 is pushed outward by the disc spring assembly 9, and because the cam pin 3 has a boss and the clutch housing 2 has a corresponding groove, the cam pin 3 is engaged with the clutch housing 2; and then the spline sleeve 1 is driven to rotate through the clutch housing 2, so that the spline sleeve 1 drives the gearbox to rotate to achieve a normal operating working state; when the gearbox is subjected to resistance, the clutch housing 2 and the cam pin 3 will rotate relative to each other and reach the corresponding torque, the cam pin 3 will compress the disc spring assembly 9, and then compress the boss on one side of the cam pin 3 into the disc spring assembly 9, so that the cam pin 3 disengages from the clutch housing 2, causing the clutch to slip, thereby playing a role. Overload protection function; then after the clutch overload slips, the driving harrow can reduce the speed of the tractor power output shaft, and the driving harrow can be lifted to drive away the obstacle; under this condition, the overload torque of the clutch will become smaller, and under the action of the disc spring assembly 9, the cam pin 3 will be pressed outward and the cam pin 3 will be pushed out. When the boss on the cam pin 3 rotates to the groove position of the clutch housing 2, the two are automatically combined. This process takes only 1 minute, which improves the working efficiency and reduces the time cost and the cost of replacing accessories; it can effectively unload the impact force on the harrow teeth, and after overload protection, reducing the speed can make the cam automatically return to its position, ensuring that the harrow teeth, transmission shaft, gear box and tractor and other power devices are not damaged, and does not cause an increase in replacement cost and time cost, thereby improving working efficiency.

[0023] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A low speed automatic cam-type load-adjustable overload protection device for driving a rake, characterized in that: The invention comprises a spline shaft sleeve (1), a clutch housing (2), a cam pin (3), a cam wear-resistant sleeve (4), an oil retaining pad (5), an elastic retaining ring (6), a sealing cover (7) and a disc spring assembly (9), wherein the clutch housing (2) is mounted on one outer wall of the spline shaft sleeve (1), the cam pin (3) is meshingly mounted on one inner wall of the clutch housing (2), the cam wear-resistant sleeve (4) is mounted on one inner wall of the clutch housing (2), and one side of the cam wear-resistant sleeve (4) is fitted and connected to the outer wall of the cam pin (3). An oil retaining pad (5) is installed on the inner wall of one side of the clutch housing (2), and the oil retaining pad (5) is installed on the outer wall of the spline shaft sleeve (1); an elastic retaining ring (6) is installed on the outer wall of one side of the oil retaining pad (5), and the elastic retaining ring (6) is installed on the outer wall of the spline shaft sleeve (1); a sealing cover (7) is installed on the inner wall of one side of the clutch housing (2), and one side of the sealing cover (7) is installed on the outer wall of the spline shaft sleeve (1); and a disc spring assembly (9) is installed in the cam pin (3).

2. The low-speed automatic combined cam-type load-adjustable overload protection device for driving a rake according to claim 1, characterized in that: The disc spring assembly (9) comprises a disc spring tensioning screw (10), a tensioning disc spring (11), a tensioning cam pin clip (12), a disc spring locking nut (13) and an elastic cylindrical pin (14); the disc spring tensioning screw (10) is installed in the cam pin (3), and one end of the disc spring tensioning screw (10) is fitted on the outer wall of the spline shaft sleeve (1); a tensioning cam is symmetrically sleeved on one side of the outer wall of the disc spring tensioning screw (10). A wheel pin clamp (12), a tension disc spring (11) is sleeved on one side outer wall of the disc spring tensioning screw (10), one side of the tension disc spring (11) is located on the two side outer walls of the tensioning cam pin clamp (12), a disc spring locking nut (13) is threadedly connected on the outer wall of the disc spring tensioning screw (10) on one side of the tension disc spring (11), and an elastic cylindrical pin (14) is inserted in the disc spring locking nut (13).

3. The low-speed automatic combined cam-type load-adjustable overload protection device for driving a rake according to claim 1, characterized in that: One side of the spline shaft sleeve (1) is threadedly connected to a limiting bolt (8).

4. The low-speed automatic combined cam-type load-adjustable overload protection device for driving a rake according to claim 2, characterized in that: A groove is provided on one side of the disc spring tensioning screw (10), and one side of the elastic cylindrical pin (14) passes through the interior of the disc spring tensioning screw (10).

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