Lifting discharging device

Abstract

A lifting discharging device comprises a frame, a driving motor, a multi-connecting-rod mechanism connected with a driving motor shaft, a rotating shaft connected with the multi-connecting-rod mechanism, a lifting transmission mechanism connected with the rotating shaft and used for driving a discharging hopper to ascend and descend, and a lifting guide mechanism used for guiding the discharging hopper to ascend and descend in the vertical direction. According to the utility model, on one hand, the action is sensitive and fast, the response is instant, the cylinder pause phenomenon is avoided, and the production requirements of high-speed and ultra-high-speed packaging machines are met; efficient power transmission is achieved through a multi-connecting-rod mechanism, and it is guaranteed that the driving process is stable and accurate; and on the other hand, due to the design of the lifting guide mechanism, the production precision requirement can be greatly lowered, the cost is reduced, the action clamping stagnation phenomenon caused by part machining errors is completely eradicated, and the working stability of the whole device is improved.

Description

Technical Field

[0001] This utility model relates to a feeding device, and more particularly to a lifting feeding device. Background Technology

[0002] Currently, most common lifting and unloading devices on the market use two cylinders as the drive, and are guided by linear bearings and guide rods to ensure that the cylinder piston rods are not damaged due to uneven force caused by misalignment during the lifting process. However, this type of lifting and unloading device has the following main disadvantages:

[0003] (1) The action is slow and the synchronization is poor. Two cylinders are used as the driving source. The cylinder drive is controlled by a solenoid valve, which requires a reaction time. Moreover, the two cylinders cannot rise and fall at the same time. The application is limited for some equipment with high-speed and ultra-high-speed packaging requirements.

[0004] (2) High precision requirements and high manufacturing cost. Due to the requirements of lifting guide, it is necessary to ensure the parallelism between each guide rod and the fit tolerance between the guide rod and the linear bearing mounting parts, which directly leads to an increase in the part processing cost; and if the fit between the parts is poor, it may cause jamming during the lifting process, thus affecting normal operation. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings of the prior art and provide a lifting and unloading device that is sensitive, quick to respond, and highly stable.

[0006] The technical solution of this utility model is: a lifting and unloading device, including a frame, a drive motor, a multi-link mechanism connected to the drive motor shaft, a rotating shaft connected to the multi-link mechanism, a lifting transmission mechanism connected to the rotating shaft and used to drive the unloading hopper to rise and fall, and a lifting guide mechanism used to guide the unloading hopper to rise and fall in the vertical direction.

[0007] Furthermore, it also includes a gate drive mechanism for controlling the opening and closing of the discharge gate of the hopper.

[0008] Furthermore, it also includes a material gate drive mechanism for controlling the opening and closing of the material gate of the hopper. The frame is provided with a motor base and a pair of first bearings with mounting brackets, the drive motor is fixed on the motor base, and the rotating shaft is connected between the pair of first bearings with mounting brackets.

[0009] Furthermore, it also includes a material gate drive mechanism for controlling the opening and closing of the material gate of the hopper. The multi-link mechanism includes a motor swing arm, a motor connecting rod, and a rotating shaft swing arm; the motor swing arm is axially connected to the drive motor; the two ends of the motor connecting rod are respectively hinged to the motor swing arm and the rotating shaft swing arm, and the rotating shaft swing arm is sleeved on the rotating shaft.

[0010] Furthermore, it also includes a material gate drive mechanism for controlling the opening and closing of the material gate of the hopper. The lifting transmission mechanism includes a lifting swing arm, a connecting rod, and a connecting seat; one end of the lifting swing arm is sleeved on the rotating shaft, and the other end is hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to the connecting seat; the connecting seat is fixed to the material hopper.

[0011] Furthermore, each side of the hopper is symmetrically connected to a lifting transmission mechanism and a lifting guide mechanism; the lifting guide mechanism includes multiple sets of roller mechanisms and guide components that cooperate with each set of roller mechanisms.

[0012] Furthermore, the roller mechanism includes a roller seat and at least two rollers connected to the roller seat; the guide assembly includes a guide sleeve, a guide bracket, and a guide shaft; the guide shaft passes between the multiple rollers of the roller mechanism and is connected to the guide bracket, and the guide sleeve is fitted between the upper end of the guide shaft and the guide bracket; the rollers are capable of rolling up and down along the guide shaft.

[0013] Furthermore, the material gate drive mechanism includes a material gate cylinder and a transmission unit that drives the material gate to open and close; the lower part of the material hopper has at least one material gate, and the material gate is rotatably connected to the transmission unit.

[0014] Furthermore, the lower part of the hopper is provided with a first discharge gate and a second discharge gate; the transmission part includes a first rotating arm, a second rotating arm, discharge gate shafts that connect the first rotating arm and the second rotating arm respectively, and a connecting block hinged between the first rotating arm and the second rotating arm; each discharge gate shaft is connected between a pair of second seated bearings, and the second seated bearings are fixed on the connecting parts of the hopper; the first rotating arm is fitted onto one side of a discharge gate shaft, and the second rotating arm is fitted onto one side of another discharge gate shaft; the piston rod end of the discharge gate cylinder is connected to one end of the first rotating arm via a cylinder joint bearing.

[0015] Furthermore, the roller is connected to the roller seat via a roller pin, and the roller pin is fixed to the roller seat by bolts; multiple deep groove ball bearings are fitted inside the roller, and each deep groove ball bearing is separated by a spacer and limited and fixed by holes and retaining rings; the deep groove ball bearings are fitted onto the roller pin and fixed to the end of the roller pin by bolts.

[0016] The beneficial effects of this utility model are as follows: Firstly, the use of a servo motor instead of a cylinder as the drive source results in sensitive and rapid action with immediate response, eliminating cylinder stalling and meeting the production requirements of high-speed and ultra-high-speed packaging machines. Furthermore, the parallelogram structure formed by multiple links achieves efficient power transmission, ensuring a smooth and precise driving process. Secondly, the lifting guide mechanism uses rollers to clamp the guide rods for vertical movement instead of traditional linear bearing guide rods, significantly reducing production accuracy requirements, lowering costs, eliminating action jamming caused by parts processing errors, and improving the overall stability of the device. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the lifting and unloading device according to an embodiment of this utility model;

[0018] Figure 2 This is a three-dimensional structural diagram of the frame of an embodiment of this utility model;

[0019] Figure 3 yes Figure 1 Side view of the embodiment shown;

[0020] Figure 4 yes Figure 1 Rear view of the embodiment shown;

[0021] Figure 5 yes Figure 3 A sectional view along line AA of the embodiment shown;

[0022] Figure 6 yes Figure 5 A BB-direction sectional view of the embodiment shown;

[0023] Figure 7 yes Figure 3 CC-direction sectional view of the embodiment shown;

[0024] Figure 8 yes Figure 3 The embodiment shown is a DD-direction sectional view;

[0025] Figure 9 yes Figure 4 The embodiment shown is a cross-sectional view along the EE direction;

[0026] Figure 10 yes Figure 4 The embodiment shown is a cross-sectional view along the FF direction;

[0027] Figure 11 yes Figure 3 The embodiment shown is a cross-sectional view along the GG direction;

[0028] Figure 12 This is a schematic diagram of the workflow of an embodiment of the present utility model.

[0029] Explanation of reference numerals in the attached diagram:

[0030] 1. Frame; 2. Servo motor; 3. Multi-link mechanism; 4. Lifting transmission mechanism; 5. Lifting guide mechanism; 6. Material gate drive mechanism; 7. Rotary shaft; 8. Feed hopper;

[0031] 11. Motor mount; 12. First mounted bearing;

[0032] 31. Motor swing arm; 32. Motor connecting rod; 33. Rotary shaft swing arm; 34. First swing arm bolt; 35. First locking block;

[0033] 41. Lifting arm; 42. Connecting rod; 43. Connecting seat; 44. Second locking block; 45. Connecting rod joint bearing; 46. Second lifting arm bolt; 47. First pin; 48. Cotter pin;

[0034] 51. Roller mechanism; 511. Roller seat; 512. Roller; 513. Roller pin; 514. Deep groove ball bearing; 515. Spacer; 516. Retaining ring; 52. Guide assembly; 521. Guide bushing; 522. Guide bracket; 523. Guide shaft;

[0035] 61. Discharge gate cylinder; 62. Left rotating arm; 63. Right rotating arm; 64. Connecting block; 65. Discharge gate pivot; 66. Second pin; 67. Second bearing with seat; 68. Hanger mounting base; 69. Hanger; 611. Cylinder bracket; 612. Cylinder tailstock; 613. Cylinder spherical bearing;

[0036] 81. Square plate; 82. Left lower material door; 83. Right lower material door; 84. Material door folding plate. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] like Figures 1-4 As shown: A lifting and unloading device includes a frame 1, a servo motor 2, a multi-link mechanism 3 connected to the shaft of the servo motor 2, a rotating shaft 7 connected to the multi-link mechanism 3, a lifting transmission mechanism 4 connected to the rotating shaft 7 and used to drive the unloading hopper 8 to rise and fall, a lifting guide mechanism 5 used to guide the unloading hopper 8 to rise and fall in the vertical direction, and a material gate drive mechanism 6 used to control the opening and closing of the unloading gate of the unloading hopper 8.

[0039] The above scheme has the following advantages:

[0040] (1) By using a servo motor instead of the existing cylinder as the driving source, and using a multi-link mechanism combined with the servo motor, the output torque and speed of the servo motor can be precisely adjusted, ensuring the synchronization of the device. The servo motor can achieve high-speed movement and can respond quickly to control signals, thus meeting the needs of high-speed and ultra-high-speed packaging.

[0041] (2) By setting up a multi-link mechanism, timely transmission can be achieved. As a transition mechanism between the servo motor and the rotating shaft, it is convenient to convert the rotational motion of the servo motor into the rotational motion of the rotating shaft, and further drive the lifting transmission mechanism through the rotating shaft to achieve lifting motion. Compared with other complex transmission methods, the multi-link mechanism can simplify the overall design, reduce the number of intermediate links, and distribute the load more evenly and reduce the phenomenon of local stress concentration through a reasonable mechanical structure.

[0042] (3) By setting up a lifting guide mechanism, it is possible to effectively prevent the hopper from tilting or shaking during the lifting process, ensuring that it always remains vertical and improving the accuracy and stability of the feeding process.

[0043] Specifically, in this embodiment, a motor base 11 and two first bearings 12 are fixed to the upper surface of the frame 1, wherein the servo motor 2 is fixed on the motor base 11, and the rotating shaft 7 is connected between the two first bearings 12. The frame 1 has a hollow structure, and the hopper 8 is installed in the hollow position of the frame 1. More preferably, the frame 1 is placed on the ground, and the hopper 8 extends into the frame 1, with its lower end extending out of the frame 1. For example, the site accommodating the entire lifting and unloading device is divided into two layers, with the entire frame 1 placed on the upper layer and the lower end of the hopper 8 extending to the lower layer.

[0044] In this embodiment, the multi-link mechanism 3 includes a motor swing arm 31, a motor connecting rod 32, and a rotating shaft swing arm 33. The motor swing arm 31 is sleeved on the motor shaft of the servo motor 2 and locked with screws. The two ends of the motor connecting rod 32 are hinged between the motor swing arm 31 and the rotating shaft swing arm 33 via first swing arm bolts 34, forming the multi-link mechanism 3. Specifically, the motor swing arm 31 and the rotating shaft swing arm 33 have threaded holes. Two first swing arm bolts 34 pass through the motor connecting rod 32 and are screwed onto the motor swing arm 31 and the rotating shaft swing arm 33 respectively, with a gap between the screw of the first swing arm bolt 34 and the hole of the motor connecting rod 32, allowing the motor connecting rod 32 to rotate, thus achieving a hinged connection. The rotating shaft swing arm 33 is fixed to the rotating shaft 7 by bolts via a first locking block 35, enabling the multi-link mechanism 3 to drive the rotating shaft 7 to rotate. The first locking block 35 is sleeved on the rotating shaft 7 and locked with bolts.

[0045] In this embodiment, there are two sets of lifting transmission mechanisms 4, which are symmetrically arranged on both sides of the unloading hopper 8. The lifting transmission mechanism 4 includes a lifting swing arm 41, a connecting rod 42, and a connecting seat 43. One end of the lifting swing arm 41 is fixed to the rotating shaft 7 with bolts through the second locking block 44, and the other end is hinged to one end of the connecting rod 42. The other end of the connecting rod 42 is hinged to the connecting seat 43. Specifically, the upper and lower ends of the connecting rod 42 are connected to connecting rod joint bearings 45. The connecting rod joint bearings 45 are fastened to both ends of the connecting rod 42 with nuts. The connecting rod joint bearing 45 located at the upper end of the connecting rod 42 is hinged to the lifting swing arm 41 through the second swing arm bolt 46, and the connecting rod joint bearing 45 located at the lower end of the connecting rod 42 is hinged to the connecting seat 43 through the first pin 47. The first pin 47 is limited and fixed by the cotter pin 48 to prevent the first pin 47 from slipping out of the connecting rod joint bearing 45 or from axial displacement. The connecting seat 43 is fixed to both sides of the upper plane of the square plate 81 of the hopper 8.

[0046] like Figure 5 , Figure 6 , Figure 9 and Figure 11 As shown: In this embodiment, the lifting guide mechanism 5 includes multiple sets of roller mechanisms 51 and guide components 52 that cooperate with each set of roller mechanisms 51.

[0047] Specifically, at least one set of roller mechanisms 51 is provided on both sides of the hopper 8. In this embodiment, four sets are preferably provided, that is, two sets on each side, and the two sets of roller mechanisms 51 are located on the side of the connecting rod 42 away from the hopper 8, and are symmetrically arranged along the connecting rod 42. Among them, the roller mechanism 51 includes a roller seat 511 and four rollers 512. The four rollers 512 are arranged in a 2-row, 2-column manner on the roller seat 511. The rollers 512 are connected to the roller seat 511 through roller pins 513, and the roller pins 513 are fixed to the roller seat 511 by bolts. The four rollers 512 are arranged facing away from the connecting rod 42. Two deep groove ball bearings 514 are fitted inside the rollers 512. The two bearings are separated by a spacer 515 and are limited and fixed by a hole and a retaining ring 516. The deep groove ball bearings 514 are fitted on the roller pins 513 and fixed to the end of the roller pins 513 by bolts. The roller seat 511 is fixed to the edge of the upper plane of the square plate 81 of the hopper 8 by bolts.

[0048] The guide assembly 52 includes a guide sleeve 521, a guide bracket 522, and a guide shaft 523. The guide shaft 523 passes between the four rollers 512 of the roller mechanism 51 and is engaged at the step of the guide bracket 522. The guide sleeve 521 fits between the upper end of the guide shaft 523 and the guide bracket 522. After assembly, the guide bracket 522 is fixed to the bottom of the frame 1. By setting the guide assembly 52, the rollers 512 can roll up and down along the guide shaft 523 to guide the movement trajectory of the hopper 8, making it move up and down. This allows for smoother and more precise control of the lifting and lowering of the hopper 8, while reducing the burden on the servo motor 2 and the multi-link mechanism 3, thus improving the reliability of the device.

[0049] This embodiment employs a combination of a roller mechanism and a guide assembly. On one hand, the contact method between the roller and the guide shaft, compared to direct friction, significantly reduces the coefficient of friction, decreases wear, and extends the service life of the device. Furthermore, the roller provides continuous support, reducing vibration or jamming caused by uneven contact. Especially after prolonged use, the guide shaft may become uneven due to wear; the roller can compensate for this by rolling, thus contributing to the smooth lifting and lowering of the hopper, ensuring smoother operation of the entire device, and greatly reducing precision requirements. On the other hand, the roller and guide shaft have a simple structure, relatively low manufacturing cost, and are relatively easy to clean and maintain.

[0050] like Figure 7 , Figure 8 and Figure 10As shown: In this embodiment, the material gate drive mechanism 6 includes a material gate cylinder 61 and a transmission part that drives the material gate to open and close; the transmission part includes a left rotating arm 62, a right rotating arm 63, a material gate rotating shaft 65 that connects the left rotating arm 62 and the right rotating arm 63 respectively, and a connecting block 64 hinged between the left rotating arm 62 and the right rotating arm 63. Specifically, hanger mounting seats 68 are installed on both sides of the lower plane of the square plate 81 of the hopper 8, and the hanger mounting seats 68 are fixed to the lower plane of the square plate 81 by bolts; the two sides of the hanger 69 are respectively bolted to the hanger mounting seats 68; a pair of second seated bearings 67 are provided on both sides of the hanger 69, and a material gate rotating shaft 65 is connected between each pair of second seated bearings 67; the left rotating arm 62 is fitted onto one side of a material gate rotating shaft 65, and the right rotating arm 63 is fitted onto one side of another material gate rotating shaft 65. The tail end of the discharge gate cylinder 61 is movably connected to the cylinder tailstock 612. The cylinder tailstock 612 is fixed to the top of the cylinder bracket 611 by bolts, and the cylinder bracket 611 is fixed to the hanger 69 by bolts. The piston rod end of the discharge gate cylinder 61 is fastened to the cylinder joint bearing 613 by a nut, and the cylinder joint bearing 613 is fixedly connected to one end of the left rotating arm 62. The other end of the left rotating arm 62 and one end of the right rotating arm 63 are both hinged to a connecting block 64 by a second pin 66. The lower part of the discharge hopper 8 is provided with a left discharge gate 82 and a right discharge gate 83. The left discharge gate 82 and the right discharge gate 83 are respectively fixed to the two discharge gate rotating shafts 65 by bolts, and are further reinforced by bolts using discharge gate folding plates 84.

[0051] The working principle of opening and closing the left and right lower gates 82 and 83 is as follows: When the piston rod of the lower gate cylinder 61 extends, it pushes the cylinder joint bearing 613 downward, thereby moving the left rotating arm 62 downward. This causes the lower gate shaft 65 connected to the left rotating arm 62 to rotate counterclockwise, thus closing the left lower gate 82. Meanwhile, the end of the connecting block 64 connected to the left rotating arm 62 moves downward, while the other end of the connecting block 64 (the part connected to the right rotating arm 63) moves upward, causing the right rotating arm 63 to move upward along the shaft 7. The lower gate shaft 65 connected to the right rotating arm 63 then rotates clockwise, and the right lower gate 83 is also in the closed state. Similarly, when the piston rod of the lower gate cylinder 61 retracts, the left and right lower gates 82 and 83 become open.

[0052] The overall working principle of this embodiment is as follows: The entire device is mounted on the frame 1, and the frame 1 is mounted on the mounting plane of the machine frame. The rotation of the motor shaft of the servo motor 2 drives the multi-link mechanism 3, which consists of the motor swing arm 31, the motor connecting rod 32, and the rotating shaft swing arm 33, to rotate. The rotation of the multi-link mechanism 3 drives the rotating shaft 7 to rotate, and the rotation of the rotating shaft 7 drives the two lifting swing arms 41 to rotate. For example, when the two lifting swing arms 41 are driven to rotate counterclockwise downward, the connecting rod 42 will be driven to rotate. Since the connecting seat 43 at the lower end of the connecting rod 42 is fixed on the square plate 81 of the hopper 8, the hopper 8 will be driven to move downward. However, it cannot be guaranteed that the hopper 8 will move in a straight line. Therefore, when the hopper 8 moves downward, since the roller seat 511 is also fixed on the square plate 81 of the hopper 8, the roller 512 will roll up and down along the guide shaft 523, so that the hopper 8 will move up and down with the rotation of the motor shaft, ensuring that the hopper 8 moves in the vertical direction.

[0053] Initially, the hopper 8 is in the raised state and the piston rod of the discharge gate cylinder 61 is in the extended state, while the left discharge gate 82 and the right discharge gate 83 are in the closed state. Figure 12 The working steps are shown in step ①. Then, when the packaging bag is moved below the discharge port of the hopper 8, the motor shaft of the servo motor 2 is rotated, causing the hopper 8 to descend. The left discharge gate 82 and right discharge gate 83 then descend into the packaging bag opening, as shown in step ②. Subsequently, the piston rod of the discharge gate cylinder 61 retracts, and the left and right discharge gates 82 and 83 become open, allowing the material to begin falling from the hopper 8 into the packaging bag, as shown in step ③. After the discharge is complete, the motor shaft of the servo motor 2 is rotated in the opposite direction, causing the hopper 8 to rise back to its initial position.

[0054] In summary, this invention, on the one hand, uses a servo motor instead of a cylinder as the drive source, resulting in sensitive and rapid action and immediate response, eliminating cylinder stalling and meeting the production requirements of high-speed and ultra-high-speed packaging machines; and on the other hand, the parallelogram structure formed by multiple links achieves efficient power transmission, ensuring a smooth and precise driving process; and on the other hand, the lifting guide mechanism uses rollers to clamp the guide rods for up-and-down movement guidance instead of traditional linear bearing guide rods, greatly reducing production accuracy requirements, lowering costs, eliminating action jamming caused by parts processing errors, and improving the overall stability of the device.

[0055] Furthermore, the term "connection" should be interpreted broadly, for example, it can include fixed connections, detachable connections, or integral connections; it can include direct connections or indirect connections through an intermediate medium, and it can also include internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A lifting and unloading device, characterized in that, It includes a frame, a drive motor, a multi-link mechanism connected to the drive motor shaft, a rotating shaft connected to the multi-link mechanism, a lifting transmission mechanism connected to the rotating shaft and used to drive the hopper to rise and fall, and a lifting guide mechanism used to guide the hopper to rise and fall in the vertical direction.

2. The lifting and unloading device according to claim 1, characterized in that, It also includes a material gate drive mechanism for controlling the opening and closing of the material gate of the hopper.

3. The lifting and unloading device according to claim 1 or 2, characterized in that, The frame is provided with a motor base and a pair of first bearings with mounting brackets. The drive motor is fixed on the motor base and the shaft is connected between the pair of first bearings with mounting brackets.

4. The lifting and unloading device according to claim 1 or 2, characterized in that, The multi-link mechanism includes a motor swing arm, a motor connecting rod, and a rotating shaft swing arm; the motor swing arm is shaft-connected to the drive motor; the two ends of the motor connecting rod are respectively hinged to the motor swing arm and the rotating shaft swing arm, and the rotating shaft swing arm is sleeved on the rotating shaft.

5. The lifting and unloading device according to claim 1 or 2, characterized in that, The lifting transmission mechanism includes a lifting arm, a connecting rod, and a connecting seat; one end of the lifting arm is sleeved on the rotating shaft, and the other end is hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to the connecting seat; the connecting seat is fixed on the hopper.

6. The lifting and unloading device according to claim 1 or 2, characterized in that, The two sides of the hopper are symmetrically connected to a lifting transmission mechanism and a lifting guide mechanism; the lifting guide mechanism includes multiple sets of roller mechanisms and guide components that cooperate with each set of roller mechanisms.

7. The lifting and unloading device according to claim 6, characterized in that, The roller mechanism includes a roller seat and at least two rollers connected to the roller seat; the guide assembly includes a guide sleeve, a guide bracket, and a guide shaft; the guide shaft passes between the multiple rollers of the roller mechanism and is connected to the guide bracket, and the guide sleeve fits between the upper end of the guide shaft and the guide bracket; the rollers are capable of rolling up and down along the guide shaft.

8. The lifting and unloading device according to claim 2, characterized in that, The material gate drive mechanism includes a material gate cylinder and a transmission part that drives the material gate to open and close; the lower part of the material hopper has at least one material gate, and the material gate is rotatably connected to the transmission part.

9. The lifting and unloading device according to claim 8, characterized in that, The lower part of the hopper is provided with a first discharge gate and a second discharge gate; the transmission part includes a first rotating arm, a second rotating arm, discharge gate shafts that connect the first rotating arm and the second rotating arm respectively, and a connecting block hinged between the first rotating arm and the second rotating arm; each discharge gate shaft is connected between a pair of second seated bearings, and the second seated bearings are fixed on the connecting parts of the hopper; the first rotating arm is fitted onto one side of a discharge gate shaft, and the second rotating arm is fitted onto one side of another discharge gate shaft; the piston rod end of the discharge gate cylinder is connected to one end of the first rotating arm via a cylinder joint bearing.

10. The lifting and unloading device according to claim 7, characterized in that, The roller is connected to the roller seat via a roller pin, and the roller pin is fixed to the roller seat with bolts. Multiple deep groove ball bearings are installed inside the roller, and each deep groove ball bearing is separated by a spacer and limited and fixed by a hole and a retaining ring. The deep groove ball bearings are fitted onto the roller pin and fixed to the end of the roller pin with bolts.

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