Automatic discharging mechanism

Abstract

The invention belongs to the technical field of steel pipe machining and discloses an automatic discharging mechanism which comprises a first stand column, a second stand column is arranged on one side of the first stand column, a steel pipe discharging seat is fixedly arranged at the upper end of the first stand column, and a feeding channel is formed in the steel pipe discharging seat. A self-switching feeding mechanism is arranged between the first stand column and the second stand column, and position switching and automatic feeding of the pipes are achieved in the mode that the pipes move downwards along with the lifting plate and then are automatically transferred. According to the automatic discharging mechanism, through the mode that the lifting plate ascends and descends up and down in a reciprocating mode, stable bearing of high-position pipe materials is achieved, meanwhile, after the lifting plate drives a steel pipe to slide downwards, the steel pipe is borne and guided through the guide plate, and the steel pipe can smoothly and downwards transit to the guide wheel on the other side; and therefore, the steel pipes are further conveyed away from machining equipment by the guide wheels, the machining efficiency is improved, and the steel pipes are prevented from being subjected to large impact to cause accidents.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe processing, in particular to an automatic unloading mechanism. Background Art

[0002] With the continuous development of industrial technology, steel pipes are more and more widely used in various fields, such as construction, machinery manufacturing, petrochemicals, etc. In the production and processing of steel pipes, the unloading link is a crucial step. The traditional unloading method of steel pipes mainly relies on manual operation, which is not only labor-intensive and inefficient, but also has safety hazards. Therefore, the development of an efficient and reliable automatic unloading mechanism for steel pipes has important practical significance. In traditional steel pipe production and processing enterprises, manual unloading is the most common method. Workers need to move steel pipes from the unloading position of processing equipment or production lines one by one. This method has great labor intensity and low efficiency of manual unloading, which seriously affects the production progress. Especially in the case of large-scale production, manual unloading is difficult to meet production needs. There are also certain safety risks in manual operation. For example, accidents such as steel pipes slipping and injuring workers may occur during transportation. Some companies have adopted simple mechanical unloading devices, such as slope unloading racks. Steel pipes roll on the slope by their own gravity. Although this unloading method reduces the labor intensity to a certain extent, there are still some problems. For example, the angle of the slope needs to be based on the steel pipe. The size and weight of the steel pipe need to be adjusted, otherwise the steel pipe may not roll smoothly or roll off, and the simple mechanical unloading device has a low degree of automation, usually requires manual assistance, and cannot achieve true automatic unloading. There are also some more advanced automatic unloading mechanisms for steel pipes on the market, but their structure and performance still have some shortcomings. The structure of some automatic unloading mechanisms is complex, the manufacturing cost is high, and the maintenance is difficult, which requires enterprises to invest a lot of money when introducing these equipment, increasing the production cost. Some automatic unloading mechanisms have poor adaptability and can only be applied to steel pipes of specific sizes and specifications. Different types of steel pipes require complex adjustments and modifications. During the operation of the existing automatic unloading mechanism, problems such as steel pipe jamming and collision may occur, affecting the stability and reliability of unloading. At the same time, the speed of manual unloading and simple mechanical unloading is slow, which cannot meet the high-efficiency requirements of modern industrial production. Although the traditional automatic unloading mechanism has improved the efficiency to a certain extent, there is still room for further improvement. The simple mechanical unloading device and the traditional automatic unloading mechanism may have safety accidents caused by equipment failure or improper operation. Summary of the invention

[0003] The object of the present invention is to provide an automatic unloading mechanism to solve the problems of low unloading efficiency and easy safety accidents caused by equipment failure in the unloading mechanism proposed in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic unloading mechanism, comprising a first column, a second column is arranged on one side of the first column, and a steel pipe discharging seat is fixedly arranged on the upper end of the first column, and a feeding channel is opened inside the steel pipe discharging seat, an obstruction sensor is fixedly arranged on the outer surface of the first column below the feeding channel, a sliding lifting plate is arranged between the first column and the second column, and another lifting plate is fixedly connected between the lower ends of the first column and the second column, a lifting motor is fixedly installed on the outer surfaces of the first column and the second column, a sliding groove is opened on the side surfaces facing the first column and the second column, and a rotating lifting wheel is installed on the inner surface of the upper end of the sliding groove, a lifting chain is installed on the outer surface of the lifting wheel, and one end of the lifting chain is rotatably connected to a guide rod, a guide groove is opened on the side surfaces of the first column and the second column, and a self-switching feeding mechanism is arranged between the first column and the second column, and the position switching and automatic feeding of the pipe material are realized by automatically transferring the pipe material after the lifting plate moves downward.

[0005] Preferably, the self-switching feeding mechanism includes: a mounting frame, the mounting frame is fixedly arranged on the upper surface of the lifting plate, and the side surface of the lifting plate is fixedly installed with a driving motor by bolts, and the upper end surface of the lifting plate is fixedly installed with a mounting limit frame by bolts, the inner surface of the mounting limit frame is installed with a rotating supporting shaft, and the outer surface of the end of the supporting shaft away from the driving motor is fixedly connected with a synchronous connecting wheel, and the end of the supporting shaft away from the driving motor is fixedly connected with a guide wheel, a synchronous connecting chain is connected between the synchronous connecting wheels on the surfaces of two adjacent supporting shafts, a protective baffle is fixedly arranged on the upper surface of the lifting plate fixedly connected to the first column and the second column, and a guide plate is fixedly arranged on the upper surface of the lifting plate fixedly connected to the first column and the second column, a rotating detection flap is installed on the inner surface of the guide plate, and a mounting plate is fixedly arranged on the inner surface of the guide plate, and a press switch is fixedly arranged on the outer surface of the mounting plate.

[0006] By adopting the above technical solution, the steel pipe can be stably received and transported from top to bottom.

[0007] Preferably, one end of the output shaft of the lifting motor passes through the inner surface of the sliding groove and is fixedly connected to the rotating shaft of the lifting wheel, one end of the guide rod passes through the guide groove, and the guide groove is a continuous S-shaped design, and one end of the lifting chain is fixedly connected to the upper surface of the lifting plate sliding between the first column and the second column.

[0008] By adopting the above technical solution, the lifting plate can be driven to slide up and down.

[0009] Preferably, one end of the output shaft of the driving motor is fixedly connected to one end of the rotating shaft supporting the rotating shaft, and the guide wheel is a cylindrical design with two frustoconical ends, and the diameters of the two ends of the guide wheel are larger than the middle diameter of the guide wheel.

[0010] By adopting the above technical solution, the guide wheel can keep the steel pipe located in the middle of the guide wheel during the process of conveying the steel pipe.

[0011] Preferably, the outer surface of the protective baffle is penetrated by the guide wheel on one side, and the upper end surface of the protective baffle is higher than the highest point of the outer surface of the guide wheel.

[0012] By adopting the above technical solution, the protective baffle can prevent the steel pipe from being separated from the support of the guide wheel during the sliding process.

[0013] Preferably, the upper end surface of the guide plate is designed to be inclined, and the end of the guide plate facing the first column is higher than the end of the guide plate facing the protective baffle, and the highest point of the upper surface of the guide plate is higher than the highest point of the outer surface of the guide wheel between the first column and the second column, and the highest point of the guide plate is located between the two guide wheels between the first column and the second column.

[0014] By adopting the above technical solution, the guide plate can bring the steel pipe away from the guide wheel when the steel pipe falls along with the guide wheel.

[0015] Preferably, a speed-limited descent mechanism is provided on one side of the first column and the second column, so as to prevent the lifting plate from falling due to a sudden failure of the lifting motor by limiting the descent speed of the lifting plate.

[0016] By adopting the above technical solution, the lifting plate can be limited when it falls rapidly to prevent the occurrence of crushing accidents.

[0017] Preferably, the speed limiting descent mechanism includes: a speed limiting safety frame, which is fixedly arranged on the outer surface of the lifting plate between the first column and the second column, and a limiting plate is fixedly arranged on the outer surface of the upper end of the speed limiting safety frame, a rotating limiting connecting wheel is installed on the surface of the speed limiting safety frame, and a protective wheel is fixedly connected to one end of the rotating shaft of the limiting connecting wheel, and a rotating protective card plate is installed inside the outer surface of the protective wheel, and a fixed gear rod is fixedly arranged on the outer surfaces of the first column and the second column where the speed limiting safety frame is located.

[0018] By adopting the above technical solution, the lifting plate can monitor the descending speed through the speed limiting safety frame during the descending process to achieve the purpose of preventing the lifting plate from falling uncontrollably.

[0019] Preferably, the limit plate is arranged toward the protection wheel, and the limit plate is designed to be tilted upward, and the limit connecting wheel is meshingly connected with the fixed gear rod.

[0020] By adopting the above technical solution, the limiting connecting wheel rotates by meshing with the fixed gear rod during the lifting process of the lifting plate.

[0021] Preferably, the limiting connecting wheel and the protection wheel are concentrically arranged, and a spring is connected between the protection wheel and the protection clamping plate. The protection clamping plate is arc-shaped and evenly arranged on the inner surface of the protection wheel.

[0022] By adopting the above technical solution, the protective clamping plate can extend out of the protective wheel and engage with the limiting plate to provide limiting protection for the lifting plate during the high-speed rotation of the protective wheel.

[0023] Compared with the prior art, the invention has the following beneficial effects: the automatic unloading mechanism:

[0024] 1. The lifting plate is lifted up and down to achieve stable receiving of the pipe material at a high place. At the same time, the lifting plate is used to drive the steel pipe to slide down, and then the guide plate is used to support and guide the steel pipe, so that the steel pipe can smoothly transition downward to the guide wheel on the other side, and then the steel pipe is further transported away from the processing equipment by the guide wheel, which not only improves the processing efficiency, but also prevents the steel pipe from being subjected to a large impact and causing an accident;

[0025] 2. Furthermore, the sliding state of the steel pipe is monitored by the detection flap on the inner side of the guide plate, so that the guide wheel responsible for conveying and unloading the steel pipe can be automatically started after the steel pipe is moved into place, avoiding energy waste caused by continuous rotation of the guide wheel when there is no steel pipe;

[0026] 3. Furthermore, by using the protection wheel to prevent the protection plate from being thrown out when the lifting plate descends too quickly, the protection plate can limit the lifting plate by engaging with the limit plate when the lifting plate descends too quickly, so that the lifting plate will not fall too quickly when the lifting motor fails, causing an accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the connection between the first column, the steel pipe discharge seat and the feeding channel of the present invention;

[0029] Figure 3 This is a schematic diagram of a three-dimensional structure of a first column connected to an occlusion sensor according to the present invention;

[0030] Figure 4 It is a three-dimensional structural schematic diagram of the connection section of the lifting motor, the guide rod and the lifting wheel of the present invention;

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the overall cutaway surface of the present invention;

[0032] Figure 6 It is a three-dimensional structural schematic diagram of the connecting section of the guide plate, the mounting plate and the push switch of the present invention;

[0033] Figure 7 This is a schematic diagram of the three-dimensional structure of the speed limit safety frame and the limit plate connected to the present invention;

[0034] Figure 8 It is a schematic diagram of the three-dimensional structure of the cross-section surface of the connection between the protection wheel and the protection clamp plate of the present invention;

[0035] Fig. 9 It is a schematic diagram of the three-dimensional structure of the driving motor, the mounting limit frame and the supporting shaft of the present invention;

[0036] Fig.10 It is a schematic diagram of the three-dimensional structure of the guide plate and the detection flap connected to each other in the present invention.

[0037] In the figure: 1. first column; 2. second column; 3. steel pipe discharge seat; 4. feeding channel; 5. shielding sensor; 6. lifting plate; 7. lifting motor; 8. sliding groove; 9. lifting wheel; 10. lifting chain; 11. guide rod; 12. guide groove; 13. mounting frame; 14. driving motor; 15. mounting limit frame; 16. supporting shaft; 17. synchronous connecting wheel; 18. guide wheel; 19. synchronous connecting chain; 20. protective baffle; 21. guide plate; 22. detection flap; 23. mounting plate; 24. push switch; 25. speed limit safety frame; 26. limit plate; 27. limit connecting wheel; 28. protective wheel; 29. ​​protective card plate; 30. fixed gear rod. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figure 1-Figure 10 The present invention provides a technical solution: an automatic unloading mechanism.

[0040] Embodiment 1: This embodiment discloses a first column 1, a second column 2 is provided on one side of the first column 1, and a steel pipe discharge seat 3 is fixedly provided on the upper end of the first column 1, and a feeding channel 4 is provided inside the steel pipe discharge seat 3, and a blocking sensor 5 is fixedly provided on the outer surface of the first column 1 below the feeding channel 4, a sliding lifting plate 6 is provided between the first column 1 and the second column 2, and another lifting plate 6 is fixedly connected between the lower ends of the first column 1 and the second column 2, a lifting motor 7 is fixedly installed on the outer surfaces of the first column 1 and the second column 2, a sliding groove 8 is provided on the side surfaces facing the first column 1 and the second column 2, and a rotating lifting wheel 9 is installed on the inner surface of the upper end of the sliding groove 8, a lifting chain 10 is installed on the outer surface of the lifting wheel 9, and one end of the lifting chain 10 is rotatably connected to a guide rod 11, and a guide groove 12 is provided on the side surfaces of the first column 1 and the second column 2;

[0041] One end of the output shaft of the lifting motor 7 passes through the inner surface of the sliding groove 8 and is fixedly connected to the rotating shaft of the lifting wheel 9. One end of the guide rod 11 passes through the guide groove 12, and the guide groove 12 is a continuous S-shaped design. One end of the lifting chain 10 is fixedly connected to the upper surface of the lifting plate 6 sliding between the first column 1 and the second column 2.

[0042] During normal use, when the steel pipe slides out along the feeding channel 4 in the steel pipe discharging seat 3 at the upper end of the first column 1, when one end of the steel pipe moves to the blocking sensor 5, the blocking sensor 5 is triggered. The blocking sensor 5 sends an electrical signal to start the lifting motor 7, and the lifting motor 7 drives the lifting chain 10 to move and lift the lifting plate 6 through the lifting wheel 9, so that the lifting plate 6 slides up the sliding groove 8 of the first column 1 and the second column 2 and is lifted into place before the steel pipe slides out of the feeding channel 4 and loses support. At this time, as the steel pipe slides onto the lifting plate 6, the lifting motor 7 drives the lifting wheel 9 to rotate in the opposite direction so that the lifting plate 6 drops and resets;

[0043] When the lifting plate 6 slides up and down, the guide rod 11 slides in the guide groove 12 so that one end of the lifting chain 10 will not slide randomly.

[0044] Embodiment 2: Based on Embodiment 1, this embodiment discloses that a self-switching feeding mechanism is provided between the first column 1 and the second column 2, and the position switching and automatic feeding of the pipe material are realized by automatically transferring the pipe material after the lifting plate 6 moves downward;

[0045] The self-switching feeding mechanism includes: a mounting frame 13, the mounting frame 13 is fixedly arranged on the upper surface of the lifting plate 6, and the side surface of the lifting plate 6 is fixedly installed with a driving motor 14 by bolts, and the upper end surface of the lifting plate 6 is fixedly installed with a mounting limit frame 15 by bolts, and the inner surface of the mounting limit frame 15 is installed with a rotating support shaft 16, and the outer surface of the end of the support shaft 16 away from the driving motor 14 is fixedly connected with a synchronous connecting wheel 17, and the end of the support shaft 16 away from the driving motor 14 is fixedly connected with a guide wheel 1 8. A synchronous connection chain 19 is connected between the synchronous connection wheels 17 on the surfaces of two adjacent support shafts 16. A protective baffle 20 is fixedly arranged on the upper surface of the lifting plate 6 fixedly connected to the first column 1 and the second column 2, and a guide plate 21 is fixedly arranged on the upper surface of the lifting plate 6 fixedly connected to the first column 1 and the second column 2. A rotating detection flap 22 is installed on the inner surface of the guide plate 21, and a mounting plate 23 is fixedly arranged on the inner surface of the guide plate 21, and a press switch 24 is fixedly installed on the outer surface of the mounting plate 23;

[0046] One end of the output shaft of the driving motor 14 is fixedly connected to one end of the rotating shaft of the supporting rotating shaft 16, and the guide wheel 18 is a cylindrical design with two truncated cones at both ends, and the diameters of the two ends of the guide wheel 18 are larger than the diameter of the middle section of the guide wheel 18;

[0047] The outer surface of the protective baffle 20 is penetrated by the guide wheel 18 on one side, and the upper end surface of the protective baffle 20 is higher than the highest point of the outer surface of the guide wheel 18;

[0048] The upper end surface of the guide plate 21 is designed to be inclined, and the end of the guide plate 21 facing the first column 1 is higher than the end of the guide plate 21 facing the protective baffle 20, and the highest point of the upper surface of the guide plate 21 is higher than the highest point of the outer surface of the guide wheel 18 between the first column 1 and the second column 2, and the highest point of the guide plate 21 is located between the two guide wheels 18 between the first column 1 and the second column 2;

[0049] When the steel pipe falls onto the lifting plate 6, the steel pipe is supported by the guide wheel 18, and the driving motor 14 is started to drive the support shaft 16 on the mounting limit frame 15 fixed by the mounting frame 13 to rotate. The support shaft 16 realizes the synchronous driving of all the guide wheels 18 through the synchronous connecting wheel 17 and the synchronous connecting chain 19. At this time, the guide wheel 18 drives the steel pipe to move completely into place through contact with the steel pipe;

[0050] When the lifting plate 6 moves down to its position, the steel pipe is supported by the upper end of the guide plate 21 and is out of contact with the guide wheel 18. The steel pipe slides downward along the inclined guide plate 21, and the steel pipe squeezes the upper end of the detection flap 22, causing the detection flap 22 to flip over and let the steel pipe pass. At the same time, the lower end of the detection flap 22 rotates and squeezes the push switch 24 on the outer surface of the mounting plate 23. The push switch 24 is triggered to send an electrical signal to the drive motor 14 on one side of the protective baffle 20. The drive motor 14 drives the guide wheel 18 on one side of the protective baffle 20 to rotate synchronously. At this time, the steel pipe falls onto the rotating guide wheel 18 and will not fall out due to the obstruction of the protective baffle 20. The rotating guide wheel 18 continues to convey the steel pipe away from the processing equipment to complete automatic unloading.

[0051] Embodiment 3: Based on Embodiment 1 and Embodiment 2, this embodiment discloses that a limited speed descending mechanism is provided on one side of the first column 1 and the second column 2, so as to prevent the lifting plate 6 from falling due to a sudden failure of the lifting motor 7 by limiting the descending speed of the lifting plate 6;

[0052] The speed limiting descending mechanism comprises: a speed limiting safety frame 25, the speed limiting safety frame 25 is fixedly arranged on the outer surface of the lifting plate 6 between the first column 1 and the second column 2, and a limit plate 26 is fixedly arranged on the outer surface of the upper end of the speed limiting safety frame 25, a rotating limit connecting wheel 27 is installed on the surface of the speed limiting safety frame 25, and a protection wheel 28 is fixedly connected to one end of the rotating shaft of the limit connecting wheel 27, and a rotating protection card plate 29 is installed inside the outer surface of the protection wheel 28, and a fixed gear rod 30 is fixedly arranged on the outer surfaces of the first column 1 and the second column 2 where the speed limiting safety frame 25 is located;

[0053] The limit plate 26 is disposed toward the protection wheel 28 and is designed to be tilted upward, and the limit connecting wheel 27 is meshedly connected with the fixed gear rod 30;

[0054] The limiting connecting wheel 27 and the protection wheel 28 are concentrically arranged, and a spring is connected between the protection wheel 28 and the protection clamping plate 29. The protection clamping plate 29 is arc-shaped and evenly arranged on the inner surface of the protection wheel 28.

[0055] When the lifting motor 7 fails during the rising process of the lifting plate 6, causing the lifting plate 6 to descend rapidly, the limit connecting wheel 27 rotates by meshing with the fixed gear rod 30 while the speed limiting safety frame 25 slides down with the lifting plate 6. When the speed of the limit connecting wheel 27 is too fast, the protection card plate 29 inside the side surface of the protection wheel 28 rotates under the action of centrifugal force to stretch the spring between the protection wheel 28 and the protection wheel 28 and extend out of the outer surface of the protection wheel 28. At this time, the protection card plate 29 is engaged with the limit plate 26, making the limit connecting wheel 27 unable to rotate, so that the lifting plate 6 is limited and cannot continue to slide down.

[0056] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. An automatic unloading mechanism, comprising a first column (1), a second column (2) being arranged on one side of the first column (1), a steel pipe discharge seat (3) being fixedly arranged on the upper end of the first column (1), and a feeding channel (4) being provided inside the steel pipe discharge seat (3), characterized in that: A blocking sensor (5) is fixedly arranged on the outer surface of the first column (1) below the feeding channel (4); a sliding lifting plate (6) is arranged between the first column (1) and the second column (2); another lifting plate (6) is fixedly connected between the lower ends of the first column (1) and the second column (2); a lifting motor (7) is fixedly installed on the outer surfaces of the first column (1) and the second column (2); and a sliding groove (8) is provided on the side surfaces facing each other of the first column (1) and the second column (2). A rotatable lifting wheel (9) is installed on the inner surface of the upper end of the sliding groove (8), a lifting chain (10) is installed on the outer surface of the lifting wheel (9), and one end of the lifting chain (10) is rotatably connected to a guide rod (11), and guide grooves (12) are provided on the side surfaces of the first column (1) and the second column (2), and a self-switching feeding mechanism is provided between the first column (1) and the second column (2), so that the position switching and automatic feeding of the pipe material are realized by automatically transferring the pipe material after the lifting plate (6) moves downward.

2. The automatic unloading mechanism according to claim 1, characterized in that: The self-switching feeding mechanism comprises: a mounting frame (13), the mounting frame (13) being fixedly arranged on the upper surface of the lifting plate (6), and a driving motor (14) being fixedly mounted on the side surface of the lifting plate (6) by means of bolts, and a mounting limit frame (15) being fixedly mounted on the upper end surface of the lifting plate (6) by means of bolts, a rotating supporting shaft (16) being mounted on the inner surface of the mounting limit frame (15), and a synchronous connecting wheel (17) being fixedly connected to the outer surface of one end of the supporting shaft (16) away from the driving motor (14), and a guide wheel (18) being fixedly connected to the one end of the supporting shaft (16) away from the driving motor (14), A synchronous connection chain (19) is connected between the synchronous connection wheels (17) on the surfaces of two adjacent support shafts (16); a protective baffle (20) is fixedly arranged on the upper surface of a lifting plate (6) fixedly connected to the first column (1) and the second column (2); and a guide plate (21) is fixedly arranged on the upper surface of the lifting plate (6) fixedly connected to the first column (1) and the second column (2); a rotating detection flap (22) is installed on the inner surface of the guide plate (21); and a mounting plate (23) is fixedly arranged on the inner surface of the guide plate (21); and a push switch (24) is fixedly installed on the outer surface of the mounting plate (23).

3. The automatic unloading mechanism according to claim 1, characterized in that: One end of the output shaft of the lifting motor (7) passes through the inner surface of the sliding groove (8) and is fixedly connected to the rotating shaft of the lifting wheel (9); one end of the guide rod (11) passes through the guide groove (12), and the guide groove (12) is a continuous S-shaped design; one end of the lifting chain (10) is fixedly connected to the upper surface of the lifting plate (6) sliding between the first column (1) and the second column (2).

4. The automatic unloading mechanism according to claim 2, characterized in that: One end of the output shaft of the driving motor (14) is fixedly connected to one end of the rotating shaft of the supporting rotating shaft (16); the guide wheel (18) is a cylindrical design with two truncated cones at both ends, and the diameters at both ends of the guide wheel (18) are larger than the diameter of the middle section of the guide wheel (18).

5. The automatic unloading mechanism according to claim 2, characterized in that: The outer surface of the protective baffle (20) is penetrated by the guide wheel (18) on one side, and the upper end surface of the protective baffle (20) is higher than the highest point of the outer surface of the guide wheel (18).

6. The automatic unloading mechanism according to claim 2, characterized in that: The upper end surface of the guide plate (21) is designed to be inclined, and the end of the guide plate (21) facing the first column (1) is higher than the end of the guide plate (21) facing the protective baffle (20), and the highest point of the upper surface of the guide plate (21) is higher than the highest point of the outer surface of the guide wheel (18) between the first column (1) and the second column (2), and the highest point of the guide plate (21) is located between the two guide wheels (18) between the first column (1) and the second column (2).

7. The automatic unloading mechanism according to claim 1, characterized in that: A speed-limited descent mechanism is provided on one side of the first column (1) and the second column (2), which limits the descent speed of the lifting plate (6) to prevent the lifting plate (6) from falling due to a sudden failure of the lifting motor (7).

8. The automatic unloading mechanism according to claim 7, characterized in that: The speed limiting descending mechanism comprises: a speed limiting safety frame (25), the speed limiting safety frame (25) is fixedly arranged on the outer surface of a lifting plate (6) between a first column (1) and a second column (2), and a limiting plate (26) is fixedly arranged on the outer surface of the upper end of the speed limiting safety frame (25), a rotating limiting connecting wheel (27) is installed on the surface of the speed limiting safety frame (25), and a protection wheel (28) is fixedly connected to one end of the rotating shaft of the limiting connecting wheel (27), and a rotating protection card plate (29) is installed inside the outer surface of the protection wheel (28), and a fixed gear rod (30) is fixedly arranged on the outer surfaces of the first column (1) and the second column (2) where the speed limiting safety frame (25) is located.

9. The automatic unloading mechanism according to claim 8, characterized in that: The limiting plate (26) is arranged toward the protection wheel (28), and the limiting plate (26) is designed to be tilted upward, and the limiting connecting wheel (27) is meshedly connected with the fixed gear rod (30).

10. The automatic unloading mechanism according to claim 8, characterized in that: The limiting connecting wheel (27) and the protection wheel (28) are concentrically arranged, and a spring is connected between the protection wheel (28) and the protection clamping plate (29). The protection clamping plate (29) is of arc-shaped design, and the protection clamping plate (29) is evenly arranged on the inner surface of the protection wheel (28).

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