Seat pitch adjustment device

Abstract

The utility model discloses a kind of seat pitch adjusting device, including logging truck, the cab of logging truck is equipped with seat, and seat is installed in cab by bottom plate, the lower end of seat is equipped with buffer unit, and the lower end of buffer unit is equipped with top plate, adjusting mechanism is equipped between bottom plate and top plate, for adjusting seat pitch angle;The utility model is equipped with horizontal inclination sensor by setting the adjusting range of adjusting mechanism ±15 °, can read the inclination angle of logging truck, then control motor rotation adjusts and compensates the inclination angle of seat;While using circular arc guide rail slider as main structure, structure gap is small firm stable;Using the adjusting mode of cam groove and cam slider combination, motor and screw rod are used as power to push cam slider, while the cam structure with large pressure angle has self-locking ability, so that the adjusting mechanism has greater carrying capacity, while it can meet the demand of frequent adjustment.

Description

Technical Field

[0001] This utility model relates to the field of forestry logging equipment technology, and in particular to a seat tilt adjustment device. Background Technology

[0002] In forestry logging operations, logging vehicles often need to operate on steep slopes, relying on winches to assist in the felling process. Due to the complex terrain of the work site, the logging vehicle frame is prone to tilting with the slope, causing the cab to tilt accordingly. Under these conditions, the seat in the cab will tilt downwards as the cab tilts. When the tilt angle is too large, it will not only seriously affect the driver's operational safety, making it difficult for the driver to stabilize the equipment, but also significantly reduce the driver's comfort. Prolonged operation can easily lead to driver fatigue and restrict the efficiency of logging operations.

[0003] Currently, the tilt angle adjustment function of the seats equipped in the cabs of logging vehicles has obvious limitations. The maximum tilt angle adjustment is usually only about 10°, which is far from meeting the seat angle adjustment needs when operating on steep slopes. It is difficult to offset the adverse effects of the cab tilt through seat adjustment. To improve this situation, the industry has tried to add a tilt adjustment device to the bottom of the seat body to expand the tilt adjustment range of the seat.

[0004] Existing tilt adjustment devices for seats mostly employ two sets of cross-folding rods as the core support structure. The adjustment principle involves manually changing the height difference between the two sets of folding rods to adjust the seat's tilt angle. However, such devices have several drawbacks in practical applications: Firstly, when the seat bears a heavy load, the difficulty of manually adjusting the height of the folding rods increases significantly, making the adjustment process laborious and cumbersome, which cannot meet the needs of frequent seat angle adjustments during logging operations. Secondly, the overall structural design of such devices is relatively simple, with large gaps between components, resulting in poor overall stability, unreliable connections, and significant seat sway during use.

[0005] To address this issue, a seat tilt adjustment device is proposed to solve the problems existing in the prior art. Utility Model Content

[0006] The purpose of this utility model is to address the aforementioned problems by providing a seat tilt adjustment device. This utility model features an adjustment range of ±15°, equipped with a horizontal tilt sensor to read the tilt angle of the logging vehicle, and then controls the motor rotation to adjust and compensate for the seat tilt angle. It utilizes a circular arc guide rail slider as the main structure, resulting in a small gap and robust stability. The adjustment method combines a cam groove and a cam slider, using a motor and lead screw as power to drive the cam slider. The large pressure angle cam structure has a self-locking capability, giving the adjustment mechanism a large load-bearing capacity and meeting the needs of frequent adjustments. To achieve the above-mentioned utility model objectives, the technical solution adopted is as follows: According to one aspect of the present invention, a seat tilt adjustment device is provided, including a logging vehicle, wherein a seat is provided in the cab of the logging vehicle and the seat is installed in the cab via a base plate, a buffer unit is provided at the lower end of the seat and a top plate is provided at the lower end of the buffer unit, and an adjustment mechanism is provided between the base plate and the top plate for adjusting the seat tilt angle.

[0007] Preferably, the adjustment mechanism includes two symmetrically arranged arc guide rails on the base plate, an arc base between the two arc guide rails, a left arc slider and a right arc slider respectively in the two arc guide rails, and a common arc plate between the left and right arc sliders. The arc plate matches the shape of the arc base. A horizontal groove is formed on the arc plate, and an oblique guide groove is formed on the arc base. A driving mechanism is provided in the arc plate, and a cam slider is provided on the driving mechanism. The cam slider passes through the horizontal groove and cooperates with the oblique guide groove. The tops of the left and right arc sliders are connected to the top plate.

[0008] Preferably, the driving mechanism includes two cylindrical guide rails connected to the left and right circular arc sliders. A lead screw fixing seat is slidably mounted on the two cylindrical guide rails, and a ball screw is mounted on the lead screw fixing seat. One end of the ball screw extends outside the right circular arc slider and is mounted on a driven sprocket. A reduction motor is mounted inside the circular arc plate. The output end of the reduction motor extends outside the right circular arc slider and is mounted on a driving sprocket. The driving sprocket and the driven sprocket are driven by a chain. The cam slider is connected to the bottom of the lead screw fixing seat.

[0009] Preferably, the number of cam sliders is two.

[0010] Preferably, a horizontal angle sensor is provided at the front end of the base plate.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: The present invention discloses a seat tilt adjustment device. By setting an adjustment range of ±15°, the adjustment mechanism is equipped with a horizontal tilt angle sensor to read the tilt angle of the logging vehicle, and then controlling the motor rotation to adjust and compensate for the tilt angle of the seat. At the same time, it adopts an arc-shaped guide rail slider as the main structure, with small structural gaps and a sturdy and stable structure. The adjustment method uses a combination of cam groove and cam slider, with a motor and lead screw as power to drive the cam slider. The cam structure with a large pressure angle has a self-locking ability, which gives the adjustment mechanism a large load-bearing capacity and can meet the needs of frequent adjustment. Attached Figure Description

[0012] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the adjustment mechanism of this utility model; Figure 3 This is a utility model Figure 2 Internal structure diagram; Figure 4 This is a utility model Figure 2 Internal structure diagram; Figure 5 This is a utility model Figure 2 A bottom view; Figure 6 This is a utility model Figure 2 Exploded view of the structure; In the attached diagram: 1. Seat; 2. Buffer unit; 3. Top plate; 4. Base plate; 5. Arc guide rail; 6. Arc base; 7. Left arc slider; 8. Right arc slider; 9. Arc plate; 10. Horizontal groove; 11. Inclined guide groove; 12. Cam slider; 13. Cylindrical guide rail; 14. Screw fixing seat; 15. Ball screw; 16. Driven sprocket; 17. Gear motor; 18. Drive sprocket; 19. Chain; 20. Horizontal angle sensor. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of the utility model, and these aspects can be achieved even without these specific details.

[0014] Please see Figures 1 to 6 This utility model provides a seat tilt adjustment device, the technical solution of which is as follows: The vehicle includes a logging vehicle, in which a seat 1 is provided in the cab and the seat 1 is installed in the cab via a base plate 4. A buffer unit 2 is provided at the lower end of the seat 1. The buffer unit 2 is an existing airbag buffer device. A top plate 3 is provided at the lower end of the buffer unit 2. An adjustment mechanism is provided between the base plate 4 and the top plate 3 for adjusting the tilt angle of the seat 1.

[0015] The adjustment mechanism adopts the structure of an arc-shaped slide table. The lower part of the arc-shaped guide rail 5 is fixed on the cab floor 4, and the upper part of the slider platform is connected to the seat 1. The slide table and the arc-shaped guide rail 5 not only fit together with a small gap, but also have a large contact area. When the cab shakes, the pitch adjustment device can provide stable support for the seat 1. The slider can be relatively tilted ±15° relative to the slide rail base, which gives the adjustment mechanism a large load-bearing capacity and can meet the needs of frequent adjustment.

[0016] The adjustment mechanism includes two symmetrically arranged arc guide rails 5 on the base plate 4, an arc base 6 between the two arc guide rails 5, a left arc slider 7 and a right arc slider 8 respectively in the two arc guide rails 5, and an arc plate 9 is provided between the left arc slider 7 and the right arc slider 8. The arc plate 9 is shaped to match the arc base 6. A horizontal groove 10 is opened on the arc plate 9, and an oblique guide groove 11 is opened on the arc base 6. A driving mechanism is provided in the arc plate 9, and a cam slider 12 is provided on the driving mechanism. The cam slider 12 passes through the horizontal groove 10 and cooperates with the oblique guide groove 11. The tops of the left arc slider 7 and the right arc slider 8 are connected to the top plate 3.

[0017] The driving mechanism includes two cylindrical guide rails 13 connected to the left circular arc slider 7 and the right circular arc slider 8. A lead screw fixing seat 14 is slidably mounted on the two cylindrical guide rails 13, and a ball screw 15 is mounted on the lead screw fixing seat 14. One end of the ball screw 15 extends to the outside of the right circular arc slider 8, and a driven sprocket 16 is mounted on it. A reduction motor 17 is mounted inside the circular arc plate 9. The output end of the reduction motor 17 extends to the outside of the right circular arc slider 8, and a driving sprocket 18 is mounted on the output end of the reduction motor 17. The driving sprocket 18 and the driven sprocket 16 are driven by a chain 19. The cam slider 12 is connected to the bottom of the lead screw fixing seat 14.

[0018] Secure the left circular arc slider 7 and the circular arc plate 9 together with fixing screws. Install the copper sleeves into the corresponding holes of the ball screw 15. Secure the screw nut to the mounting base with fixing screws. Generally, the ball screw 15 is pre-assembled with the screw nut. Install the two copper sleeves into the holes on both sides of the mounting base, and then insert the two cylindrical guide rails 13. Move the cylindrical guide rails 13 and the left end of the ball screw 15 to the holes on the left circular arc slider 7. The ball screw 15 passes through the left circular arc slider 7 and is limited by the elastic retaining ring. Secure one end of the cylindrical guide rail 13 to the slider with fixing screws. Install the bearing into the screw bearing housing, and then secure the screw bearing housing to the right circular arc slider with fixing screws. 8. Move the right circular arc slider 8 closer to the center and align it. Insert the other end of the ball screw 15 into the screw bearing seat. After installation, use the slider fixing screw to fix the right circular arc slider 8 and the circular arc plate 9 together. Tighten the fixing screw into the other end of the cylindrical guide rail 13. Adjust the screw bearing seat so that it can slide smoothly along the cylindrical guide rail 13 before tightening the screw. Use the fixing screw to fix the geared motor 17 onto the right circular arc slider 8. Install the drive sprocket 18 on the output shaft of the geared motor 17 and the driven sprocket 16 on the outer end shaft of the ball screw 15. Finally, use the chain 19 to connect the drive wheel and the driven wheel to achieve transmission. At this point, the parts that swing together with the slider are basically installed.

[0019] Place the installed upper part on the arc base 6, use two arc guide rails to limit the arc sliders on the left and right sides, adjust the position, pass the cam slider 12 through the inclined guide groove 11 on the arc base 6, align it with the hole, and fix the cam slider 12 to the bottom of the fixed seat with fixing screws; finally, fix the arc guide rail 5 and the arc base 6 together with fixing screws and fixing nuts. After testing that the slider driven by the geared motor 17 could swing without problems, the base plate 4 was installed under the arc base 6 with fixing screws, and the horizontal angle sensor 20 was fixed on the mounting bracket of the base plate 4 with fixing screws. The control circuit was connected, and the motor was tested to automatically adjust the swing angle of the slider according to the inclination collected by the sensor. After the test was successful, the top plate 3 was installed on the arc slider with fixing screws. At this point, the installation of all mechanism components was completed.

[0020] The moving component, consisting of an inclined guide groove 11 and a cam slider 12, uses a geared motor 17 and a ball screw 15 module as power to convert linear motion into rotary motion. An inclined guide groove 11 is machined on the arc guide rail 5 to fix the cam slider 12 and the ball screw 15 nut fixing seat together. The cam slider 12 is normally engaged with the cam groove on the arc guide rail 5. When the ball screw 15 nut fixing seat moves linearly, the cam slider 12 moves in the cam groove, which will drive the upper part of the pitch adjustment device to swing along the trajectory of the arc guide rail 5. The motor can be built into the pitch adjustment device by using chain 19 transmission. The cam structure with a large pressure angle has a self-locking ability, which makes this adjustment mechanism have a large load-bearing capacity.

[0021] The number of cam sliders 12 is two; the two cam sliders 12 cooperate with the inclined guide grooves 11 on the arc base 6 to form more balanced support and guidance for the moving parts from both sides, disperse stress, enhance the stability of the overall structure during the swaying motion, reduce the risk of structural deformation and wear caused by uneven force on a single slider, improve the reliability of the device, and better cope with the bumpy working conditions of the logging vehicle.

[0022] The front end of the base plate 4 is equipped with a horizontal angle sensor 20; the horizontal angle sensor 20 monitors the tilt state of the base plate 4 in real time and accurately captures angle changes; once the tilt angle exceeds the predetermined value, it can quickly trigger a control command to drive the pitch adjustment device slide to automatically tilt without the need for manual intervention by the driver.

[0023] Compared to manual adjustment, it offers a more timely response and more precise adjustment, quickly offsetting the effects of cab tilt and allowing the seat angle to adapt to working conditions, improving adjustment efficiency and meeting the frequent adjustment needs of logging vehicles in complex terrain.

[0024] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A seat tilt adjustment device, characterized in that, include: The logging vehicle has a seat (1) in the driver's cab, and the seat (1) is installed in the driver's cab via a base plate (4). The lower end of the seat (1) is provided with a buffer unit (2), and the lower end of the buffer unit (2) is provided with a top plate (3). An adjustment mechanism is provided between the base plate (4) and the top plate (3) for adjusting the pitch angle of the seat (1).

2. The seat tilt adjustment device according to claim 1, characterized in that: The adjustment mechanism includes two circular arc guide rails (5) symmetrically arranged on the base plate (4), a circular arc base (6) between the two circular arc guide rails (5), a left circular arc slider (7) and a right circular arc slider (8) respectively in the two circular arc guide rails (5), and a circular arc plate (9) is provided between the left circular arc slider (7) and the right circular arc slider (8). The circular arc plate (9) is shaped to match the circular arc base (6). A horizontal groove (10) is provided on the circular arc plate (9), and an oblique guide groove (11) is provided on the circular arc base (6). A driving mechanism is provided in the circular arc plate (9), and a cam slider (12) is provided on the driving mechanism. The cam slider (12) passes through the horizontal groove (10) and cooperates with the oblique guide groove (11). The tops of the left circular arc slider (7) and the right circular arc slider (8) are connected to the top plate (3).

3. The seat tilt adjustment device according to claim 2, characterized in that: The driving mechanism includes two cylindrical guide rails (13) connected to the left circular arc slider (7) and the right circular arc slider (8). A lead screw fixing seat (14) is slidably provided on the two cylindrical guide rails (13), and a ball screw (15) is provided on the lead screw fixing seat (14). One end of the ball screw (15) extends to the outside of the right circular arc slider (8), and a driven sprocket (16) is provided on it. A reduction motor (17) is provided inside the circular arc plate (9). The output end of the reduction motor (17) extends to the outside of the right circular arc slider (8), and a driving sprocket (18) is provided on the output end of the reduction motor (17). The driving sprocket (18) and the driven sprocket (16) are driven by a chain (19). The cam slider (12) is connected to the bottom of the lead screw fixing seat (14).

4. The seat tilt adjustment device according to claim 3, characterized in that: The number of the cam sliders (12) is two.

5. The seat tilt adjustment device according to claim 1, characterized in that: The base plate (4) is equipped with a horizontal angle sensor (20) at its front end.

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