An automatic tilting connection structure for the rear arm of an automatic unloading machine

Abstract

This utility model discloses an automatic rear arm flipping connection structure for an automatic unloading machine, including a base plate for connecting to the main body of the automatic unloading machine. A rotating support seat and an inclined support seat are mounted side-by-side on the upper side of the base plate. An inclined mounting plate is provided on the side of the inclined support seat facing the rotating support seat. A transmission screw is longitudinally mounted on the inclined mounting plate, and a nut block is mounted on the transmission screw. At least one push rod is rotatably connected side-by-side to the nut block. The upper end of the push rod is connected to the end of the rear arm via a rotating connecting seat. The lower side of the rear arm is rotatably connected to the rotating support seat via a rotating shaft. The transmission screw is driven to rotate by a drive motor on the inclined mounting plate. This utility model can solve the problems of insufficient control accuracy of the rear arm rotation angle and the difficulty in achieving stable rotation support in existing rotation structures.

Description

Technical Field

[0001] This utility model relates to the field of automatic unloading machine technology, specifically to an automatic rear arm flipping connection structure for an automatic unloading machine. Background Technology

[0002] Automatic unloading machines are a common type of automated equipment used in the transfer of large quantities of boxed goods. They generally consist of a front arm, a rear arm, and a main body. The front and rear arms can rotate relative to each other. The function of the front arm is to grab the boxed goods and transport them to the rear arm. An automatic flipping connection structure needs to be installed between the rear arm and the main body. Currently, most flipping connection structures use hydraulic drive for rotation. However, hydraulic drive has limited accuracy and it is difficult to maintain a precise position for a long time. Moreover, since the flipping connection structure needs to bear a relatively large weight, including the weight of the front arm, the rear arm, and the goods on it, existing rotating structures often find it difficult to achieve stable rotation support with such a large torque. Utility Model Content

[0003] This invention provides an automatic flipping connection structure for the rear arm of an automatic unloading machine, which can solve the problems of insufficient control precision of the rear arm rotation angle and the difficulty of achieving stable rotation support in existing rotation structures.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an automatic rear arm flipping connection structure for an automatic unloading machine, comprising a base plate for connecting to the main body of the automatic unloading machine. A rotating support seat and an inclined support seat are mounted side-by-side on the upper side of the base plate. An inclined mounting plate is provided on the side of the inclined support seat facing the rotating support seat. A transmission screw is longitudinally mounted on the inclined mounting plate. A nut block is mounted on the transmission screw. At least one top rod is rotatably connected side-by-side to the nut block. The upper end of the top rod is connected to the end of the rear arm via a rotating connecting seat. The lower side of the rear arm is rotatably connected to the rotating support seat via a rotating shaft. The transmission screw is driven to rotate by a drive motor on the inclined mounting plate. By setting the rotating support seat, the rear arm can be stably supported for rotation. By setting the longitudinal transmission screw, nut block, and top rod, the rear arm can be precisely rotated around the rotating support seat. Moreover, the self-locking of the transmission screw can keep the rear arm in a fixed rotational position, ensuring the smoothness of the cargo transportation process.

[0005] Preferably, the inclined support has a triangular cross-section. The triangular inclined support has stable structural characteristics, ensuring that the inclined panel can be installed stably and remain stationary, and can withstand relatively large tensile forces.

[0006] Preferably, the transmission screw is mounted between two support plates, and guide posts located on both sides of the transmission screw are connected between the support plates. A slider is provided on the guide post, and both ends of the nut block are fixedly connected to the slider. The guide posts can guide the movement of the nut block and prevent the nut block from deflecting.

[0007] Preferably, the push rods are two rods arranged side by side, with the position where the push rod connects to the nut block corresponding to the slider. The two push rods simultaneously push the rear arm to rotate around the rotating support seat, which can withstand a relatively large tensile force. The correspondence between the push rod and the slider allows the tensile force borne by the push rod to be distributed to the positions of the two sliders, and the tensile force is borne by the slider and the guide post.

[0008] Preferably, the output end of the drive motor is connected to a speed reducer, and the output end of the speed reducer is connected to the transmission screw via a transmission belt, which can control the speed of the transmission screw. At the same time, the drive motor can be arranged side by side on one side of the transmission screw, parallel to the transmission screw, making the structure more compact.

[0009] Preferably, multiple position sensors are arranged along the length of the mounting inclined plate, and a position sensing block that cooperates with the position sensors is installed on the side of the nut block. The multiple position sensors can monitor the position of the nut block and sense different positions of the rear arm, so that the control system can react in time and the adjustment is very convenient.

[0010] Preferably, the mounting inclined panel is provided with a long strip-shaped mounting base along its length, and the long strip-shaped mounting base is provided with a sliding groove. The position sensor is slidably set along the sliding groove, and the position sensor can be quickly adjusted along the sliding groove on the long strip-shaped mounting base to adapt to different operating conditions.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] With a simple structure, the rear arm can be stably supported by a rotating support seat. The rear arm can be precisely rotated around the rotating support seat by setting a longitudinal transmission screw, nut block and push rod. Moreover, the self-locking of the transmission screw can keep the rear arm in a fixed position, ensuring the smoothness of the cargo transportation process. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram based on the present invention;

[0014] Figure 2 This is based on the main view structural diagram of this utility model;

[0015] Figure 3 This is a top view structural diagram based on the present invention;

[0016] Figure 4 This is a schematic diagram of an automatic unloading machine according to the present invention.

[0017] Figure label:

[0018] 1. Base plate; 11. Position sensor; 12. Long strip mounting base; 13. Position sensing block; 14. Rotating shaft; 15. Top rod; 16. Inclined support base; 17. Slider; 18. Transmission belt; 2. Rotating support base; 3. Mounting inclined plate; 4. Transmission screw; 5. Guide post; 6. Support plate; 7. Nut block; 8. Rotating connecting base; 9. Drive motor; 10. Reducer; A. Rear arm; B. Main body. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0020] This invention addresses the problems of insufficient control precision in the rear arm rotation angle and the difficulty in achieving stable rotational support using existing rotational structures. For example... Figure 1-4 As shown, the following technical solution is provided: an automatic rear arm flipping connection structure for an automatic unloading machine, including a base plate 1 for connecting to the main body B of the automatic unloading machine. A rotating support seat 2 and an inclined support seat 16 are mounted side by side on the upper side of the base plate 1. An inclined mounting plate 3 is provided on the side of the inclined support seat 16 facing the rotating support seat 2. A transmission screw 4 is longitudinally mounted on the inclined mounting plate 3. A nut block 7 is mounted on the transmission screw 4. At least one top rod 15 is rotatably connected side by side on the nut block 7. The upper end of the top rod 15 is connected to the end of the rear arm A through a rotating connecting seat 8. The lower side of the rear arm A is rotatably connected to the rotating support seat 2 through a rotating shaft 14. The transmission screw 4 is driven to rotate by a drive motor 9 on the inclined mounting plate 3. The solution in this embodiment solves the problems of insufficient accuracy and poor support stability of existing hydraulic drives through the combined structure of the rotating support seat 2, the transmission screw 4, and the top rod 15. The rotating support 2 is connected to the rear arm A via a rigid rotating shaft 14, and can bear the total weight of the rear arm and the cargo. Combined with the helical transmission characteristics of the transmission screw 4, the rotation angle control accuracy of the rear arm A reaches ±0.5°. The trapezoidal thread design of the transmission screw 4 has natural self-locking properties. When the power is off or the drive stops, the rear arm can remain stationary at any angle without slippage. For example, when the static load is 3000kg, the position offset is ≤0.1mm in 24 hours, ensuring no shaking during cargo transportation.

[0021] Specifically, the base plate 1 is made of Q235 steel plate, 20mm thick, and 800mm×500mm in size. It is connected to the flange face of the main body B by eight M16 high-strength bolts. The rotating support 2 is a cast steel part with a height of 250mm. It can also adopt a structure that is integrally welded with the base plate 1. Its top is hinged to the lower side of the rear arm A by a 45# steel shaft with a diameter of 50mm and a 6210 deep groove ball bearing to ensure smooth rotation without jamming. The inclined support 16 is welded and fixed to the base plate 1. The inclined plate 3 is installed at an angle of 60° to the horizontal plane. The transmission screw 4, with a diameter of 30mm and a length of 600mm, is installed longitudinally on it and fixed by bearing seats at both ends. The drive motor 9 is a 1.5kW servo motor, model 130ST-M15015, which directly drives the screw to rotate through a coupling. The speed can be adjusted within the range of 0-10r / min by PLC control.

[0022] The output end of the drive motor 9 is connected to a reducer 10, and the output end of the reducer 10 is connected to the transmission screw 4 via a transmission belt 18. This reduces the speed of the transmission screw 4 and allows the drive motor 9 to be arranged side-by-side with the transmission screw 4, making the structure more compact. The reducer 10 can amplify the output torque of the drive motor 9 by 5 times, meeting the high torque requirements of the transmission screw 4. The transmission belt 18 is a synchronous belt model HTD5M-800, which has no slippage and lower noise compared to gear transmission. The parallel arrangement of the drive motor 9 and the transmission screw 4 saves installation space.

[0023] In this embodiment, the inclined support 16 has a triangular cross-section. Utilizing the principle of triangular stability, the inclined support has a larger anti-overturning moment compared to a rectangular support. The welding length between its base and the substrate is ≥300mm, and the fit error between the inclined surface and the mounting inclined panel 3 is ≤0.5mm, ensuring that the mounting inclined panel 3 does not deform under the axial force transmitted by the top rod. Specifically, the inclined support 16 is an isosceles triangular structure made of Q355B steel plate, welded to the substrate 1 by carbon dioxide gas shielded welding. The inclined surface and the mounting inclined panel 3 are connected by 12 M10 bolts with a bolt preload torque of 30N•m, ensuring no relative slippage between them.

[0024] In this embodiment, the transmission screw 4 is mounted between two support plates 6. Guide posts 5 are connected between the support plates 6 on both sides of the transmission screw 4. A slider 17 is mounted on the guide post 5. The two ends of the nut block 7 are fixedly connected to the slider 17. The guide posts 5 on both sides of the transmission screw 4 cooperate with the slider 17 to restrict the circumferential rotation of the nut block 7, so that the straightness of the movement of the nut block 7 is ≤0.03mm / m, avoiding bending deformation of the rear arm due to uneven force. Specifically, the distance between the two support plates 6 is 600mm, the guide post 5 is a chrome-plated 45 steel bar with a diameter of 20mm, the slider 17 is made of wear-resistant cast iron, and the inner hole of the slider 17 has a clearance of 0.01-0.02mm with the guide post 5. The slider 17 is fixed to both ends of the nut block 7 by four M8 bolts to ensure that the nut block 7 moves along the guide post 5 without jamming.

[0025] In this embodiment, there are two push rods 15 arranged side by side. The position where the push rod 15 is connected to the nut block 7 corresponds to the slider 17. The two push rods 15 simultaneously push the rear arm A to rotate around the rotating support seat 2. The two push rods 15 are symmetrically arranged and correspond to the position of the slider 17, so that the force at the end of the rear arm A is evenly distributed to the two push rods 15. The distance between the connection point of the push rod 15 and the rear arm A is consistent with the distance between the slider 17, so as to avoid the rear arm A from generating additional torque.

[0026] In this embodiment, multiple position sensors 11 are arranged along the length of the mounting inclined panel 3. A position sensing block 13 that cooperates with the position sensors 11 is installed on the side of the nut block 7. The multiple position sensors 11 and the position sensing block 13 cooperate to monitor the position of the nut block 7 in real time and convert it into the rotation angle of the rear arm A through the PLC. For example, if the nut block 7 moves 100mm, the rear arm rotates 15°. Compared with sensorless control, the angle adjustment response speed is greatly improved, and multiple preset angles such as 10°, 30°, and 50° can be realized. Specifically, the position sensors are Hall sensors, model A3144, and 3-5 are arranged along the length of the mounting inclined panel 3 to cover the entire stroke of the nut block 7. The position sensing block 13 is a neodymium iron boron permanent magnet, which is fixed to the side of the nut block A with screws, with a distance of 3-5mm from the position sensors 11. The signal of the position sensor 11 is connected to the PLC (model S7-1200) through wires to realize real-time closed-loop control. Meanwhile, a long strip mounting base 12 is provided on the mounting inclined panel 3 along its length direction. The long strip mounting base 12 is provided with a sliding groove. The position sensor 11 is slidably set along the sliding groove. The sliding groove of the long strip mounting base 12 allows the position sensor 11 to slide and adjust along the screw direction. The maximum rotation angle of the rear arm can be flexibly set according to the height of the goods, such as 30°-60°. The adjustment time is relatively short, adapting to different working conditions. Compared with the fixed sensor position, the applicable scenarios are expanded.

[0027] Work process:

[0028] When the angle of the rear arm A needs to be adjusted, the PLC receives a control command, such as "flip to 30°", and the drive motor 9 starts. After being reduced in speed by the reducer 10, it drives the transmission screw 4 to rotate through the transmission belt 18. The nut block 7 slides along the guide post 5 under the action of the transmission screw 4, and pushes the rear arm A to flip upward around the rotating shaft 14 through the push rod 15. At the same time, the position sensing block 13 moves with the nut block 7. When it approaches the position sensor 11 of the corresponding angle, the sensor sends a signal to the PLC. The PLC controls the motor 9 to stop, and the transmission screw 4 maintains its position due to the self-locking characteristic of the trapezoidal thread. The rear arm A is stably stopped at the 30° position.

[0029] To adjust the maximum flip angle, loosen the M6 ​​bolt on the elongated mounting base 12, slide the position sensor 11 to the target position, such as moving the sensor 11 corresponding to 50° to 200mm, and then tighten the bolt to complete the adaptation.

[0030] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0031] Furthermore, in this utility model, descriptions involving terms such as "primary," "secondary," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "primary" or "secondary" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] The various dimensional parameters, component models, and examples of manufacturing materials mentioned in the specification of this patent application are only used to illustrate that the technical solution of this application can be implemented, and do not mean that the technical solution of this application can only be implemented using the above-mentioned dimensional parameters and component models. The above-mentioned dimensional parameters, component models, and manufacturing materials do not limit the scope of protection of this application, and those skilled in the art can fully implement the technical solution of this application using other suitable parameters and equivalent components.

[0034] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. An automatic rear arm tilting connection structure for an automatic unloading machine, characterized in that, include: A base plate (1) is used to connect to the main body of the automatic unloading machine. A rotating support seat (2) and an inclined support seat (16) are installed side by side on the upper side of the base plate (1). An inclined plate (3) is provided on the side of the inclined support seat (16) facing the rotating support seat (2). A transmission screw (4) is installed longitudinally on the inclined plate (3). A nut block (7) is installed on the transmission screw (4). At least one top rod (15) is rotatably connected side by side on the nut block (7). The upper end of the top rod (15) is connected to the end of the rear arm (A) through a rotating connecting seat (8). The lower side of the rear arm (A) is rotatably connected to the rotating support seat (2) through a rotating shaft (14). The transmission screw (4) is driven to rotate by a drive motor (9) on the inclined plate (3).

2. The automatic rear arm flipping connection structure of the automatic unloading machine according to claim 1, characterized in that: The inclined support (16) has a triangular cross section.

3. The automatic rear arm flipping connection structure of the automatic unloading machine according to claim 2, characterized in that: The transmission screw (4) is mounted between two support plates (6). The support plates (6) are also connected to guide posts (5) located on both sides of the transmission screw (4). A slider (17) is provided on the guide post (5). The two ends of the nut block (7) are fixedly connected to the slider (17).

4. The automatic rear arm tilting connection structure of the automatic unloading machine according to claim 3, characterized in that: The top rods (15) are two rods arranged side by side, and the position where the top rods (15) are connected to the nut block (7) corresponds to the slider (17).

5. The automatic rear arm tilting connection structure of the automatic unloading machine according to claim 1, characterized in that: The output end of the drive motor (9) is connected to a reducer (10), and the output end of the reducer (10) is connected to the transmission screw (4) via a transmission belt (18).

6. The automatic rear arm tilting connection structure of the automatic unloading machine according to claim 1, characterized in that: Multiple position sensors (11) are provided along the length direction on the mounting inclined plate (3), and a position sensing block (13) that cooperates with the position sensors (11) is installed on the side of the nut block (7).

7. The automatic rear arm tilting connection structure of the automatic unloading machine according to claim 6, characterized in that: The mounting inclined panel (3) is provided with a long strip mounting base (12) along the length direction. The long strip mounting base (12) is provided with a sliding groove, and the position sensor (11) is slidably set along the sliding groove.

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