Folding and retractable steering system

Abstract

A folding and retracting steering system of the present invention comprises a frame, a main rotating shaft, a slave rotating shaft, an active suppressing wheel, a driven suppressing wheel, a folding mechanism, a transmission mechanism, a pair of active wheels and a pair of driven steering wheels, wherein the active suppressing wheel is mounted on one end of the frame through the main rotating shaft, and the driven suppressing wheel is mounted on the other end of the frame through the slave rotating shaft, the folding mechanism is mounted on the frame and sleeved with the main rotating shaft and the slave rotating shaft respectively, a pair of active wheels and a driven steering wheel are fixedly connected with the folding mechanism on both sides of the corresponding ends, and the transmission mechanism connects the main rotating shaft and the active wheels. It has the advantages of simple structure, convenient operation, reduced cost and energy consumption of the whole machine, and the ability to realize the touch-to-ground switching function.

Description

Technical Field

[0001] The invention mainly relates to agricultural sowing equipment, and in particular to a folding and retracting steering system. Background Art

[0002] Seed engineering has always been the focus of the world's economic work. As a country with a large population, it is particularly important for my country to cultivate excellent varieties, increase grain production, and ensure food security. For the cultivation of new crop varieties, the quality of the test is of utmost importance. Therefore, a self-propelled CNC plot seeder with a high degree of automation, precise sowing, stability, and reliability has become an urgently needed tool for various scientific research and breeding units to carry out new variety breeding, breeding of fine varieties, and field trials such as variety comparison and cultivation. At present, the sowing requirements for self-propelled plot drills are: self-propelled without relying on external power, evenly sowing a certain amount of seeds within the specified plot length, sowing one plot without stopping the machine, and sowing the next plot without any seeds remaining in the sowing and fertilizing machine when sowing the next plot to avoid mixing between varieties.

[0003] In the process of agricultural scientific research and experiment, sowing is an extremely important link. In order to ensure the accuracy of the test results, the sowing of the test plot has high requirements on row spacing control and seed uniformity within and between rows. For example, a certain amount of seeds needs to be evenly sown within the specified plot length, and the sowing between rows and within rows in the same plot should be uniform, and mixing of varieties should be avoided between different plots. At present, there are still many experimental fields in my country that use traditional manual sowing. The disadvantages of this method are high labor intensity, complicated procedures, low sowing efficiency, and uneven sowing, which seriously affect the accuracy of agricultural scientific research experiments.

[0004] In recent years, some scientific research institutions or colleges have begun to use domestic (Heilongjiang Hongxinglong) and foreign (Austria) plot seeders for sowing. Since the seeder needs to move and turn in the field and on normal ground, it is necessary to switch the ground contact of the travel wheel and the pressure wheel when moving in these two terrain environments. In the existing technology, most of them use a lifting frame to achieve the lifting and lowering of the pressure wheel, so as to achieve the ground contact switching of the travel wheel and the pressure wheel, but this method requires the configuration of a lifting frame. On the one hand, it pushes up the cost of the whole machine, and on the other hand, a lifting drive is required to drive the lifting frame to drive the pressure wheel to move, which consumes a lot of energy. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a folding and retractable steering system with a simple structure, convenient operation, reduced overall machine cost and energy consumption, and capable of realizing a touch-and-go switching function.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A foldable and retractable steering system comprises a frame, a main rotating shaft, a slave rotating shaft, an active suppressing wheel, a driven suppressing wheel, a folding mechanism, a transmission mechanism, a pair of active wheels and a pair of driven steering wheels, wherein the active suppressing wheel is mounted on one end of the frame through the main rotating shaft, and the driven suppressing wheel is mounted on the other end of the frame through the slave rotating shaft, the folding mechanism is mounted on the frame and is respectively sleeved with the main rotating shaft and the slave rotating shaft, the pair of active wheels and the driven steering wheel are fixedly connected to the folding mechanism on both sides of the corresponding ends, and the transmission mechanism connects the main rotating shaft and the active wheel.

[0008] As a further improvement of the above technical solution:

[0009] The folding mechanism includes a driving motor, a driving gear, a rack, two pairs of gear sleeves and two pairs of bearings. The driving motor is fixedly mounted on a frame, the rack is movably mounted on the frame, the driving gear is mounted on an output shaft of the driving motor and meshes with the rack, the two pairs of gear sleeves are respectively sleeved with a main rotating shaft and a slave rotating shaft through two pairs of bearings, and at least two gear sleeves on one side are meshed with the rack, and the driving wheel and the driven steering wheel are fixedly connected with the corresponding gear sleeves.

[0010] The frame is provided with a guide sleeve, and the rack is movably sleeved in the guide sleeve.

[0011] The driving wheel comprises a main wheel frame, a main wheel body and a main wheel shaft. The main wheel frame is fixedly connected to a corresponding gear shaft sleeve, and the main wheel body is installed on the main wheel frame through the main wheel shaft.

[0012] The transmission mechanism comprises a pair of sprockets and a chain. The pair of sprockets are respectively mounted on the main wheel shaft and the main rotating shaft. The chain connects the pair of sprockets.

[0013] The driven steering wheel comprises a driven wheel frame, a driven wheel body, a driven wheel shaft and a universal joint, wherein the universal joint is fixedly connected to the corresponding gear shaft sleeve, the driven wheel frame is mounted at the bottom of the universal joint, and the driven wheel body is mounted on the driven wheel frame through the driven wheel shaft.

[0014] It also includes two pairs of support members, one end of the support member located at the main wheel frame end is connected to the frame and the other end is connected to the corresponding main wheel frame, and one end of the support member located at the driven wheel frame end is connected to the frame and the other end is connected to the corresponding driven wheel frame.

[0015] The support member includes a pair of mutually hinged connecting rods, one connecting rod at the main wheel frame end is hinged to the frame, and the other connecting rod is hinged to the corresponding main wheel frame, and one connecting rod at the driven wheel frame end is hinged to the frame, and the other connecting rod is hinged to the corresponding driven wheel frame.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] The folding and retracting steering system of the present invention is that when the system is moving on the normal ground, the folding mechanism is activated to drive the driving wheel and the driven steering wheel to rotate around the main rotating shaft and the central axis of the slave rotating shaft, so that the driving wheel and the driven steering wheel are placed at the lowest point, and the main rotating shaft then drives the driving wheel to rotate through the transmission mechanism, thereby realizing the driving wheel and the driven steering wheel to rotate and move forward, and when turning, the driven steering wheel can be rotated manually; when working in the field, the folding mechanism is activated to drive the driving wheel and the driven steering wheel to rotate around the main rotating shaft and the central axis of the slave rotating shaft, so that the driving wheel and the driven steering wheel are placed at the highest point, and the main rotating shaft directly drives the active pressing wheel to rotate, thereby realizing the active pressing wheel and the driven pressing wheel to rotate and move forward, and at this time, the driving wheel is idling. Compared with the traditional structure, this system realizes the raising and lowering of the driving wheel and the driven steering wheel through the folding mechanism, thereby realizing the touch-and-go switching function between field operation and normal ground travel. It does not need to be equipped with a lifting frame. On the one hand, it reduces the cost of the whole machine. On the other hand, it does not require a lifting drive to drive the lifting frame to drive the pressing wheel to move, thus reducing energy consumption. It has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0019] Figure 2 It is a schematic diagram of the assembly structure of the driving wheel in the present invention.

[0020] Figure 3 It is a schematic diagram of the assembly structure of the driven steering wheel in the present invention.

[0021] Figure 4 It is a main structural schematic diagram of the present invention.

[0022] The symbols in the figure represent:

[0023] 1. Frame; 11. Guide sleeve; 2. Main rotating shaft; 3. Slave rotating shaft; 4. Active suppressing wheel; 5. Driven suppressing wheel; 6. Folding mechanism; 61. Driving motor; 62. Driving gear; 63. Rack; 64. Gear bushing; 65. Bearing; 7. Transmission mechanism; 71. Sprocket; 72. Chain; 8. Driving wheel; 81. Main wheel frame; 82. Main wheel body; 83. Main wheel shaft; 9. Driven steering wheel; 91. Driven wheel frame; 92. Driven wheel body; 93. Driven wheel shaft; 94. Universal joint; 10. Support member; 101. Connecting rod. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Figures 1 to 4An embodiment of the foldable and retractable steering system of the present invention is shown, which includes a frame 1, a main rotating shaft 2, a slave rotating shaft 3, an active suppressing wheel 4, a driven suppressing wheel 5, a folding mechanism 6, a transmission mechanism 7, a pair of active wheels 8 and a pair of driven steering wheels 9. The active suppressing wheel 4 is installed at one end of the frame 1 through the main rotating shaft 2, and the driven suppressing wheel 5 is installed at the other end of the frame 1 through the slave rotating shaft 3. The folding mechanism 6 is installed on the frame 1 and is respectively sleeved with the main rotating shaft 2 and the slave rotating shaft 3. A pair of active wheels 8 and a driven steering wheel 9 are fixedly connected to the folding mechanism 6 on both sides of the corresponding ends, and the transmission mechanism 7 connects the main rotating shaft 2 and the active wheel 8. When the system is moving on the normal ground, the folding mechanism 6 is activated to drive the driving wheel 8 and the driven steering wheel 9 to rotate around the main rotating shaft 2 and the central axis of the slave rotating shaft 3, so that the driving wheel 8 and the driven steering wheel 9 are placed at the lowest point, and the main rotating shaft 2 then drives the driving wheel 8 to rotate through the transmission mechanism 7, thereby realizing the driving wheel 8 and the driven steering wheel 9 to rotate and move forward, and when turning, the driven steering wheel 9 can be rotated manually; when working in the field, the folding mechanism 6 is activated to drive the driving wheel 8 and the driven steering wheel 9 to rotate around the main rotating shaft 2 and the central axis of the slave rotating shaft 3, so that the driving wheel 8 and the driven steering wheel 9 are placed at the highest point, and the main rotating shaft 2 directly drives the active pressing wheel 4 to rotate, thereby realizing the active pressing wheel 4 and the driven pressing wheel 5 to rotate and move forward, and at this time, the driving wheel 8 is idling. Compared with the traditional structure, this system realizes the raising and lowering of the driving wheel 8 and the driven steering wheel 9 through the folding mechanism 6, thereby realizing the touch-and-go switching function between field operation and normal ground travel. It does not need to configure a lifting frame. On the one hand, it reduces the cost of the whole machine. On the other hand, it does not need a lifting drive to drive the lifting frame to drive the pressing wheel to move, thereby reducing energy consumption. It has a simple structure and is easy to operate.

[0026] In this embodiment, the folding mechanism 6 includes a driving motor 61, a driving gear 62, a rack 63, two pairs of gear sleeves 64 and two pairs of bearings 65. The driving motor 61 is fixedly mounted on the frame 1, and the rack 63 is movably mounted on the frame 1. The driving gear 62 is mounted on the output shaft of the driving motor 61 and meshes with the rack 63. The two pairs of gear sleeves 64 are respectively connected to the main rotating shaft 2 and the slave rotating shaft 3 through two pairs of bearings 65, and at least two gear sleeves 64 on one side are meshed with the rack 63. The driving wheel 8 and the driven steering wheel 9 are fixedly connected to the corresponding gear sleeves 64. In this structure, the driving motor 61 rotates forward, and drives the rack 63 to move laterally through the driving gear 62. The rack 63 will drive the gear sleeve 64 to rotate forward, and the gear sleeve 64 will drive the driving wheel 8 and the driven steering wheel 9 to rotate forward and swing to the lowest point, thereby realizing the ground contact switching of normal ground travel; the driving motor 61 is reversed, and drives the rack 63 to move laterally in the opposite direction through the driving gear 62. The rack 63 will drive the gear sleeve 64 to rotate reversely, and the gear sleeve 64 will drive the driving wheel 8 and the driven steering wheel 9 to rotate reversely and swing to the highest point, thereby realizing the ground contact switching of field operations. The structure is simple and reliable.

[0027] In this embodiment, a guide sleeve 11 is provided on the frame 1, and the rack 63 is movably sleeved in the guide sleeve 11. The guide sleeve 11 forms a mounting base for the rack 63 on the one hand, and guides the movement of the rack 63 on the other hand to ensure stability.

[0028] In this embodiment, the driving wheel 8 includes a main wheel frame 81, a main wheel body 82 and a main wheel shaft 83. The main wheel frame 81 is fixedly connected to the corresponding gear shaft sleeve 64, and the main wheel body 82 is installed on the main wheel frame 81 through the main wheel shaft 83. In this structure, the main wheel frame 81, the main wheel body 82 and the main wheel shaft 83 form a one-way wheel structure, which is simple and reliable.

[0029] In this embodiment, the transmission mechanism 7 includes a pair of sprockets 71 and a chain 72. The pair of sprockets 71 are respectively mounted on the main wheel shaft 83 and the main rotating shaft 2, and the chain 72 connects the pair of sprockets 71. In this structure, the power of the main rotating shaft 2 is transmitted to the main wheel shaft 83 through the sprocket 71 and the chain 72, thereby driving the rotation of the driving wheel 8. The structure is simple and ingenious.

[0030] In this embodiment, the driven steering wheel 9 includes a driven wheel frame 91, a driven wheel body 92, a driven wheel shaft 93 and a universal joint 94. The universal joint 94 is fixedly connected to the corresponding gear sleeve 64. The driven wheel frame 91 is installed at the bottom of the universal joint 94, and the driven wheel body 92 is installed on the driven wheel frame 91 through the driven wheel shaft 93. In this structure, the driven wheel frame 91, the driven wheel body 92, the driven wheel shaft 93 and the universal joint 94 form a universal wheel structure, which is simple and reliable and can achieve steering.

[0031] In this embodiment, two pairs of support members 10 are also included, one end of the support member 10 located at the end of the main wheel frame 81 is connected to the frame 1, and the other end is connected to the corresponding main wheel frame 81, and one end of the support member 10 located at the end of the driven wheel frame 91 is connected to the frame 1, and the other end is connected to the corresponding driven wheel frame 91. In this structure, the support member 10 supports the main wheel frame 81 and the driven wheel frame 91, ensuring the stability and reliability of the main wheel frame 81 and the driven wheel frame 91 after swinging.

[0032] In this embodiment, the support member 10 includes a pair of mutually hinged connecting rods 101, one connecting rod 101 at the end of the main wheel frame 81 is hinged to the frame 1, and the other connecting rod 101 is hinged to the corresponding main wheel frame 81, and one connecting rod 101 at the end of the driven wheel frame 91 is hinged to the frame 1, and the other connecting rod 101 is hinged to the corresponding driven wheel frame 91. In this structure, the mutually hinged connecting rods 101 form a movable structure. When the driving wheel 8 and the driven steering wheel 9 are placed at the lowest point, the two connecting rods 101 are collinear, and the dead point is fixed to ensure stability during normal travel.

[0033] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A foldable and retractable steering system, characterized in that: The invention comprises a frame (1), a main rotating shaft (2), a slave rotating shaft (3), an active suppressing wheel (4), a driven suppressing wheel (5), a folding mechanism (6), a transmission mechanism (7), a pair of active wheels (8) and a pair of driven steering wheels (9), wherein the active suppressing wheel (4) is mounted on one end of the frame (1) via the main rotating shaft (2), the driven suppressing wheel (5) is mounted on the other end of the frame (1) via the slave rotating shaft (3), the folding mechanism (6) is mounted on the frame (1) and is respectively sleeved with the main rotating shaft (2) and the slave rotating shaft (3), the pair of active wheels (8) and the driven steering wheel (9) are fixedly connected to the folding mechanism (6) on both sides of the corresponding ends, and the transmission mechanism (7) connects the main rotating shaft (2) and the active wheel (8); The folding mechanism (6) comprises a driving motor (61), a driving gear (62), a rack (63), two pairs of gear shaft sleeves (64) and two pairs of bearings (65); the driving motor (61) is fixedly mounted on the frame (1); the rack (63) is movably mounted on the frame (1); the driving gear (62) is mounted on the output shaft of the driving motor (61) and meshes with the rack (63); the two pairs of gear shaft sleeves (64) are respectively sleeved with the main rotating shaft (2) and the slave rotating shaft (3) through two pairs of bearings (65); and at least two gear shaft sleeves (64) on one side are meshed with the rack (63); the driving wheel (8) and the driven steering wheel (9) are fixedly connected to the corresponding gear shaft sleeves (64); The driving wheel (8) comprises a main wheel frame (81), a main wheel body (82) and a main wheel shaft (83); the main wheel frame (81) is fixedly connected to a corresponding gear shaft sleeve (64); and the main wheel body (82) is mounted on the main wheel frame (81) via the main wheel shaft (83).

2. The folding and retracting steering system according to claim 1, characterized in that: The transmission mechanism (7) comprises a pair of sprockets (71) and a chain (72); the pair of sprockets (71) are respectively mounted on the main wheel shaft (83) and the main rotating shaft (2); and the chain (72) connects the pair of sprockets (71).

3. The folding and retracting steering system according to claim 2, characterized in that: The driven steering wheel (9) comprises a driven wheel frame (91), a driven wheel body (92), a driven wheel shaft (93) and a universal joint (94); the universal joint (94) is fixedly connected to a corresponding gear shaft sleeve (64); the driven wheel frame (91) is mounted on the bottom of the universal joint (94); and the driven wheel body (92) is mounted on the driven wheel frame (91) via the driven wheel shaft (93).

4. The folding and retracting steering system according to claim 3, characterized in that: The invention also comprises two pairs of support members (10), wherein one end of the support member (10) located at the end of the main wheel frame (81) is connected to the frame (1) and the other end is connected to the corresponding main wheel frame (81), and one end of the support member (10) located at the end of the driven wheel frame (91) is connected to the frame (1) and the other end is connected to the corresponding driven wheel frame (91).

5. The folding and retracting steering system according to claim 4, characterized in that: The support member (10) comprises a pair of mutually hinged connecting rods (101), wherein one connecting rod (101) located at the end of the main wheel frame (81) is hinged to the frame (1), and the other connecting rod (101) is hinged to the corresponding main wheel frame (81), and one connecting rod (101) located at the end of the driven wheel frame (91) is hinged to the frame (1), and the other connecting rod (101) is hinged to the corresponding driven wheel frame (91).

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