Turnover device for material frame

Abstract

The utility model discloses a turnover device for a material frame, which comprises a main body frame, and a roller type lifting component is arranged in the main body frame; a lifting cylinder is arranged at the bottom of the main body frame and is connected with a roller type lifting assembly; the roller type lifting assembly comprises a supporting frame, a transmission roller is arranged on the supporting frame, and a first gear motor drives the transmission roller to rotate relative to the supporting frame when working. A main driving rotating device and a driven rotating device are arranged on the left side and the right side of the main body frame correspondingly. The main driving rotating device comprises a main rotating shaft, a driving motor, a first air cylinder and a first rotating frame. The main rotating shaft is connected with a first rotating frame, the driven rotating device comprises a second rotating frame, and the second rotating frame rotates synchronously when the first rotating frame rotates. According to the utility model, the main driving rotating device and the driven rotating device synchronously clamp the material frame and drive the material frame to automatically rotate; the roller type lifting assembly controls the material frame to enter and exit the main body frame, the automation degree is high, and interference of the material frame is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of flipping device technology, specifically relating to a flipping device for a material frame. Background Technology

[0002] Material crates are typically used to hold products, and during product processing, the materials need to be flipped. A patent with publication number CN221140300U discloses a material crate flipping device, including a mounting bracket with a flipping motor fixed to its side. The motor drives a flipping assembly to rotate. A positioning side plate is connected to the first and second flipping arms, and a positioning cylinder is fixed to the side plate. A snap-fit ​​structure, including a snap-fit ​​connector, is connected to the positioning cylinder and matches a snap-fit ​​groove on the material crate. In this existing flipping device, the flipping motor drives the first and second flipping arms to rotate. The first and second flipping arms are connected to a positioning device, which clamps the material crate. However, the rotation axis of this existing device is located far from the material crate, resulting in significant forces on the first and second flipping arms during flipping. This leads to a large torque during flipping, making the flipping process difficult. When a heavy product is placed in the crate, the flipping motor and rotation axis are prone to jamming. Furthermore, the material crate is prone to interfering with the mounting bracket during flipping, making the flipping process unsafe and unreliable. Therefore, it is necessary to design a flipping device for the material box to overcome the above difficulties. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by designing a flipping device for a material frame. This invention uses a main drive rotating device and a driven rotating device to simultaneously clamp the material frame and drive it to rotate automatically. A roller lifting assembly controls the material frame to enter and exit the main frame, achieving a high degree of automation and avoiding interference with the material frame.

[0004] The objective of this invention is achieved through the following technical solution: a flipping device for a material frame, comprising a main frame, within which a roller lifting assembly is slidably connected; a lifting cylinder is located at the bottom of the main frame, connected to the roller lifting assembly; the roller lifting assembly includes a support frame, on which a first reduction motor and several parallel transmission rollers are mounted, the first reduction motor driving the transmission rollers to rotate relative to the support frame; a main drive rotation device and a driven rotation device are respectively located on the left and right sides of the main frame, the main drive rotation device including a main rotation shaft, a drive motor, a first cylinder, and a first rotation frame, the drive motor driving the main rotation shaft to rotate relative to the main frame, the first cylinder driving the main rotation shaft to extend and retract relative to the main frame; the main rotation shaft is connected to the first rotation frame, the driven rotation device including a second rotation frame; the second rotation frame rotates synchronously when the first rotation frame rotates.

[0005] Preferably, the main frame has a vertical guide on its side wall, and the support frame of the roller lifting assembly is slidably mounted on the vertical guide; the lifting cylinder is fixedly mounted on the bottom of the main frame, and the piston shaft of the lifting cylinder is connected to the support frame; the transmission roller is rotatably connected to the support frame through a bearing, and the transmission roller is provided with a sprocket that rotates synchronously with it; the first reduction motor is fixedly mounted on the bottom layer of the support frame, and the reducer output shaft of the first reduction motor is provided with a sprocket, and the sprocket on the first reduction motor and the sprocket on the transmission roller are connected by a chain; when the first reduction motor is working, the transmission roller rotates synchronously relative to the support frame.

[0006] Preferably, the support frame is provided with pairs of rolling elements at its corners, and the rolling elements are rotatably connected to the support frame; the rolling elements are bearings, and the two pairs of rolling elements are respectively in contact with the vertical guide; the rolling elements are symmetrically distributed on the left and right sides of the vertical guide.

[0007] Preferably, the support frame is provided with a counterweight box, which is positioned relative to the first reduction motor.

[0008] Preferably, the main frame is provided with first contact switches arranged side by side and adjacent to each other; the side of the support frame is provided with strip-shaped limiting members, and the first contact switches are arranged toward the strip-shaped limiting members; the edge of the support frame is provided with blocking members, and the blocking members are arranged higher than the transmission rollers.

[0009] In the default state, the lifting cylinder is extended. The material frame is then placed from the assembly line onto the support frame. The first geared motor drives the transmission roller to move relative to the support frame, causing the material frame to move along the roller between the first and second rotating frames. When the material frame contacts the blocking component, the first geared motor stops. At this point, the material frame is positioned between the first and second rotating frames. The first and second cylinders then work synchronously, clamping the material frame between them. Next, the lifting cylinder lowers the support frame, allowing the material frame to rotate and preventing interference between the material frame and the support frame. Then, the main drive rotating device and the driven rotating device work synchronously, rotating the material frame 180 degrees. After the material frame has rotated, the lifting cylinder extends again, bringing the support frame into contact with the bottom of the material frame. The first and second cylinders then work, controlling the first and second rotating frames to release the material frame. Finally, the first geared motor moves the material frame relative to the support frame, transporting it back onto the assembly line. Here, the rolling element and the vertical guide element work together to ensure that the support frame can only move vertically up and down, ensuring that the material frame is clamped by the first rotating frame and the second rotating frame. By setting a counterweight box, a counterweight block can be placed in the counterweight box, which is not shown in the attached drawing. By setting a first contact switch and a strip limit element, the distance of the support frame's vertical lifting is easily controlled, avoiding collisions between the support frame and the material frame.

[0010] Preferably, the main drive rotation device further includes a first sliding seat, a reducer assembly, and a transmission component; the first sliding seat is slidably connected to the main frame, a first cylinder is fixedly mounted on the main frame, and the piston shaft of the first cylinder is connected to the first sliding seat; the first sliding seat is provided with a main rotating shaft rotatably connected thereto, the reducer assembly is mounted on the top of the first sliding seat, and a transmission component, which is a chain, is provided between the output shaft of the reducer assembly and the main rotating shaft; the drive motor is connected to the reducer assembly, and when the drive motor is working, the main rotating shaft rotates relative to the first sliding seat, and the end of the main rotating shaft is provided with a first rotating frame fixedly connected thereto; the driven rotation device further includes a second sliding seat, a second cylinder, and a driven rotating shaft, the second sliding seat being slidably connected to the main frame; the second cylinder is fixedly mounted on the main frame, and the piston shaft of the second cylinder is connected to the second sliding seat; the second sliding seat is provided with a driven rotating shaft rotatably connected thereto, and the end of the driven rotating shaft is provided with a second rotating frame that rotates synchronously thereto.

[0011] Preferably, the main frame is provided with a pair of first tracks, and the first sliding seat is slidably mounted on the first track; the main frame is provided with a pair of second tracks, and the second sliding seat is slidably mounted on the second track; the first rotating frame and the second rotating frame are symmetrically arranged on the left and right sides of the main frame, and the edges of the first rotating frame and the second rotating frame are provided with several clamping plates.

[0012] When the material frame contacts the blocking element on the support frame, the first reduction motor stops working. At this point, the material frame is positioned between the first and second rotating frames. Then, the first and second cylinders work synchronously, controlling the first and second sliding seats to move closer to the material frame, thus clamping the material frame between them. Next, the lifting cylinder controls the support frame to descend, making room for the material frame. Then, the drive motor drives the reduction gear assembly to rotate, which in turn drives the main rotating shaft to rotate slowly, allowing the material frame to safely and reliably rotate 180 degrees. The clamping plate further strengthens the grip on the material frame. Then, the lifting cylinder controls the support frame to rise, bringing it into contact with the bottom of the material frame. Next, the first and second cylinders work synchronously, causing the first and second rotating frames to release the material frame. The use of first and second tracks ensures more stable and reliable movement of the first and second sliding seats, resulting in a more precise clamping.

[0013] Preferably, the end of the main rotating shaft is provided with two angled contact members arranged side by side and staggered, with an included angle between the two angled contact members; the first sliding seat is provided with two second contact switches arranged side by side, each of the second contact switches being paired with its adjacent angled contact member; when the main rotating shaft rotates, the angled contact member presses against the contact point on the second contact switch.

[0014] When the main rotating shaft rotates, the angle contact component will contact the second contact switch. The second contact switch is electrically connected to the drive motor, which can control the on and off of the drive motor, thereby precisely controlling the flipping angle of the material frame.

[0015] Preferably, the second sliding seat is provided with a limiting cylinder that is perpendicular to the second rotating frame, and the piston shaft of the limiting cylinder is provided with a limiting rod; the second rotating frame is provided with a limiting hole, the diameter of which is adapted to the outer diameter of the limiting rod; when the second rotating frame is in a vertical position, the limiting hole and the limiting rod are aligned; the second sliding seat is also provided with a proximity switch, and the second rotating frame is provided with a detection hole that matches the proximity switch; when the second rotating frame is in a vertical position, the detection hole and the proximity switch are aligned.

[0016] In the default initial state, the second rotating frame is vertically upright. A limit cylinder drives a limit rod to extend into a limit hole, ensuring the second rotating frame remains vertically upright and thus calibrating its rotational position. A proximity switch, in conjunction with a detection hole, detects the rotational position of the second rotating frame. The proximity switch generates an electrical signal only when aligned with the detection hole, indicating that the second rotating frame has automatically reset to its default initial state. If the proximity switch is misaligned with the detection hole, it will not generate an electrical signal, indicating that the second rotating frame has not reset to its initial position.

[0017] Compared with the prior art, this utility model has the following advantages: 1. By synchronously driving the material frame rotation through the main drive rotating device and the driven rotating device, the rotation process of the material frame is more labor-saving and the material frame flipping efficiency is high; 2. By synchronously working through the first cylinder and the second cylinder, the first rotating frame and the second rotating frame can clamp the material frame simultaneously, ensuring safe and reliable clamping; 3. The roller lifting assembly facilitates the control of the material frame entering and exiting the main frame, enabling automatic flow of the material frame, thus allowing the material frames on the production line to automatically and continuously flip, resulting in good sustainability; 4. By controlling the roller lifting assembly through the lifting cylinder, interference between the material frame and the support frame is avoided. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present utility model;

[0019] Figure 2 This is a perspective view of the present invention from another angle;

[0020] Figure 3 This is a 3D view of the roller lifting assembly;

[0021] Figure 4 A three-dimensional view of the main drive rotation device;

[0022] Figure 5 A three-dimensional view of the main drive rotating device from another perspective;

[0023] Figure 6 This is a perspective view of the driven rotating device;

[0024] Figure 7 for Figure 6 A magnified view of a portion of position A in the middle;

[0025] Figure 8 This is a diagram showing the usage state of this utility model;

[0026] The diagram shows the following components: 1. Main frame; 2. Roller lifting assembly; 21. Support frame; 22. First geared motor; 23. Transmission roller; 24. Rolling element; 25. Counterweight box; 26. Blocking element; 3. Lifting cylinder; 4. Main drive rotation device; 41. Main rotating shaft; 42. Drive motor; 43. First cylinder; 44. First rotating frame; 45. First sliding seat; 46. Reducer assembly; 47. Transmission element; 48. Angular contact element; 49. Second contact switch; 5. Driven rotating device; 51. Second rotating frame; 52. Second sliding seat; 53. Second cylinder; 54. Driven rotating shaft; 55. Limit cylinder; 56. Limit rod; 57. Limit hole; 58. Proximity switch; 59. Detection hole; 6. Vertical guide element; 7. First contact switch; 8. Strip limit element; 9. First track; 10. Second track; 11. Card plate. Detailed Implementation

[0027] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0028] like Figures 1 to 8 As shown, this embodiment discloses a flipping device for a material frame, including a main frame 1, with a roller lifting assembly 2 slidably connected thereto inside the main frame 1; a lifting cylinder 3 is provided at the bottom of the main frame 1, and the lifting cylinder 3 is connected to the roller lifting assembly 2; the roller lifting assembly 2 includes a support frame 21, on which a first reduction motor 22 and several parallel transmission rollers 23 are provided, and when the first reduction motor 22 is working, it drives the transmission rollers 23 to rotate relative to the support frame 21; a main drive rotation device 4 and a driven rotation device 5 are respectively provided on the left and right sides of the main frame 1, the main drive rotation device 4 includes a main rotation shaft 41, a drive motor 42, a first cylinder 43 and a first rotation frame 44, the drive motor 42 drives the main rotation shaft 41 to rotate relative to the main frame 1, and the first cylinder 43 drives the main rotation shaft 41 to extend and retract relative to the main frame 1; the main rotation shaft 41 is connected to the first rotation frame 44, and the driven rotation device 5 includes a second rotation frame 51; when the first rotation frame 44 rotates, the second rotation frame 51 rotates synchronously.

[0029] The main frame 1 has a vertical guide 6 on its side wall, and the support frame 21 of the roller lifting assembly 2 is slidably mounted on the vertical guide 6. The lifting cylinder 3 is fixedly mounted on the bottom of the main frame 1, and the piston shaft of the lifting cylinder 3 is connected to the support frame 21. The transmission roller 23 is rotatably connected to the support frame 21 through a bearing, and the transmission roller 23 is provided with a sprocket that rotates synchronously with it. The first reduction motor 22 is fixedly mounted on the bottom layer of the support frame 21, and a sprocket is provided on the reducer output shaft of the first reduction motor 22. The sprocket on the first reduction motor 22 and the sprocket on the transmission roller 23 are connected by a chain. When the first reduction motor 22 is working, the transmission roller 23 rotates synchronously relative to the support frame 21. The support frame 21 has pairs of rolling elements 24 on its corners, and the rolling elements 24 are rotatably connected to the support frame 21. The rolling elements 24 are bearings, and the two pairs of rolling elements 24 are respectively in contact with the vertical guide 6. The rolling elements 24 are symmetrically distributed on the left and right sides of the vertical guide 6. The support frame 21 contains a counterweight box 25, which is positioned opposite the first reduction motor 22. The main frame 1 has adjacent first contact switches 7 arranged side-by-side. The side of the support frame 21 has a strip-shaped limiting member 8, with the first contact switches 7 facing the strip-shaped limiting member 8. The edge of the support frame 21 has a blocking member 26, which is positioned higher than the transmission roller 23. The chain in this embodiment is a commonly used mechanical chain in the prior art, not shown in the accompanying drawings.

[0030] The main drive rotation device 4 further includes a first sliding seat 45, a reducer assembly 46, and a transmission component 47; the first sliding seat 45 is slidably connected to the main frame 1, the first cylinder 43 is fixedly mounted on the main frame 1, and the piston shaft of the first cylinder 43 is connected to the first sliding seat 45; the first sliding seat 45 is provided with a main rotating shaft 41 rotatably connected thereto, the reducer assembly 46 is mounted on the top of the first sliding seat 45, and a transmission component 47, which is a chain, is provided between the output shaft of the reducer assembly 46 and the main rotating shaft 41; the drive motor 42 is connected to the reducer assembly 46, and the drive motor 43 is connected to the reducer assembly 46. 2. During operation, the main rotating shaft 41 rotates relative to the first sliding seat 45. The end of the main rotating shaft 41 is provided with a first rotating frame 44 fixedly connected to it. The driven rotating device 5 further includes a second sliding seat 52, a second cylinder 53, and a driven rotating shaft 54. The second sliding seat 52 is slidably connected to the main frame 1. The second cylinder 53 is fixedly installed on the main frame 1, and its piston shaft is connected to the second sliding seat 52. The second sliding seat 52 contains a driven rotating shaft 54 ​​rotatably connected to it, and the end of the driven rotating shaft 54 ​​is provided with a second rotating frame 51 that rotates synchronously with it. The main frame 1 has paired first tracks 9, and the first sliding seat 45 is slidably installed on the first track 9. The main frame 1 also has paired second tracks 10, and the second sliding seat 52 is slidably installed on the second track 10. The first rotating frame 44 and the second rotating frame 51 are symmetrically arranged on the left and right sides of the main frame 1, and each of the edges of the first rotating frame 44 and the second rotating frame 51 has several retaining plates 11. The end of the main rotating shaft 41 is provided with two angle contact members 48 arranged side by side and staggered, and there is an included angle between the two angle contact members 48; the first sliding seat 45 is provided with two second contact switches 49 arranged side by side, and each second contact switch 49 is paired with its adjacent angle contact member 48; when the main rotating shaft 41 rotates, the angle contact member 48 presses against the contact point on the second contact switch 49. The second sliding seat 52 is provided with a limiting cylinder 55 that is perpendicularly arranged to the second rotating frame 51. The piston shaft of the limiting cylinder 55 is provided with a limiting rod 56. The second rotating frame 51 is provided with a limiting hole 57, the diameter of which is adapted to the outer diameter of the limiting rod 56. When the second rotating frame 51 is in a vertical position, the limiting hole 57 and the limiting rod 56 are aligned. The second sliding seat 52 is also provided with a proximity switch 58. The second rotating frame 51 is provided with a detection hole 59 that matches the proximity switch 58. When the second rotating frame 51 is in a vertical position, the detection hole 59 and the proximity switch 58 are aligned.

[0031] The specific operation process of this embodiment is as follows: In the default state, the lifting cylinder 3 is in the extended state; then the material frame is placed from the assembly line onto the support frame 21, and the first reduction motor 22 drives the transmission roller 23 to move relative to the support frame 21, so that the material frame will move along the transmission roller 23 between the first rotating frame 44 and the second rotating frame 51; when the material frame contacts the blocking member 26, the first reduction motor 22 stops working; at this time, the material frame is just between the first rotating frame 44 and the second rotating frame 51, and then the first cylinder 43 and the second cylinder 53 work synchronously, so that the material frame is clamped by the first rotating frame 44 and the second rotating frame 51; Next, the lifting cylinder 3 controls the support frame 21 to descend, thus making room for the material frame to rotate and preventing interference between the material frame and the support frame 21. Then, the main drive rotating device 4 and the driven rotating device 5 work synchronously, thereby driving the material frame to rotate 180 degrees. The drive motor 42 drives the reducer assembly 46 to rotate, which in turn drives the main rotating shaft 41 to rotate slowly, allowing the material frame to safely and reliably flip 180 degrees. When the main rotating shaft 41 rotates, the angle contact 48 contacts the second contact switch 49, which is electrically connected to the drive motor 42, thus controlling the on / off state of the drive motor 42 and precisely controlling the flipping angle of the material frame. After the material frame has flipped, the lifting cylinder 3 extends again, causing the support frame 21 to contact the bottom of the material frame. Then, the first cylinder 43 and the second cylinder 53 work, controlling the first rotating frame 44 and the second rotating frame 51 to release the material frame. Then, the first reducer motor 22 works, driving the material frame to move relative to the support frame 21, thereby transporting the material frame back to the production line. Here, the rolling element 24 and the vertical guide element 6 work together to ensure that the support frame 21 can only move vertically up and down, ensuring that the material box is just clamped by the first rotating frame 44 and the second rotating frame 51; by setting the first contact switch 7 and the strip limit element 8, it is convenient to control the distance of the support frame 21 moving up and down, and avoid the support frame 21 colliding with the material box.

[0032] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A flipping device for a material box, comprising a main frame (1), characterized in that, The main frame (1) is equipped with a roller lifting assembly (2) that is slidably connected to it; the bottom of the main frame (1) is equipped with a lifting cylinder (3), which is connected to the roller lifting assembly (2); the roller lifting assembly (2) includes a support frame (21), on which a first reduction motor (22) and several drive rollers (23) arranged side by side are provided. When the first reduction motor (22) is working, it drives the drive rollers (23) to rotate relative to the support frame (21); the left and right sides of the main frame (1) are respectively equipped with a main drive rotation device (4) and a driven drive rotation device (4). The rotating device (5) includes a main rotating shaft (41), a drive motor (42), a first cylinder (43) and a first rotating frame (44). The drive motor (42) drives the main rotating shaft (41) to rotate relative to the main frame (1), and the first cylinder (43) drives the main rotating shaft (41) to extend and retract relative to the main frame (1). The main rotating shaft (41) is connected to the first rotating frame (44). The driven rotating device (5) includes a second rotating frame (51). When the first rotating frame (44) rotates, the second rotating frame (51) rotates synchronously.

2. The flipping device for a material frame according to claim 1, characterized in that, The main frame (1) has a vertical guide (6) on its side wall. The support frame (21) of the roller lifting assembly (2) is slidably mounted on the vertical guide (6). The lifting cylinder (3) is fixedly mounted on the bottom of the main frame (1). The piston shaft of the lifting cylinder (3) is connected to the support frame (21). The transmission roller (23) is rotatably connected to the support frame (21) through a bearing. The transmission roller (23) is provided with a sprocket that rotates synchronously with it. The first reduction motor (22) is fixedly mounted on the bottom layer of the support frame (21). The reducer output shaft of the first reduction motor (22) is provided with a sprocket. The sprocket on the first reduction motor (22) and the sprocket on the transmission roller (23) are connected by a chain. When the first reduction motor (22) is working, the transmission roller (23) rotates synchronously relative to the support frame (21).

3. The flipping device for a material frame according to claim 2, characterized in that, The support frame (21) is provided with a pair of rolling elements (24) at its corners. The rolling elements (24) are rotatably connected to the support frame (21). The rolling elements (24) are bearings. The two pairs of rolling elements (24) are respectively in contact with the vertical guide (6). The rolling elements (24) are symmetrically distributed on the left and right sides of the vertical guide (6).

4. The flipping device for a material frame according to claim 2, characterized in that, The support frame (21) is provided with a counterweight box (25), which is positioned relative to the first geared motor (22).

5. The flipping device for a material frame according to claim 2, characterized in that, The main frame (1) is provided with first contact switches (7) arranged side by side and adjacent to each other; the side of the support frame (21) is provided with strip-shaped limiting members (8), and the first contact switches (7) are arranged toward the strip-shaped limiting members (8); the edge of the support frame (21) is provided with blocking members (26), and the blocking members (26) are arranged higher than the transmission roller (23).

6. The flipping device for a material frame according to claim 1, characterized in that, The main drive rotation device (4) further includes a first sliding seat (45), a reducer assembly (46), and a transmission component (47); the first sliding seat (45) is slidably connected to the main frame (1), the first cylinder (43) is fixedly installed on the main frame (1), and the piston shaft of the first cylinder (43) is connected to the first sliding seat (45); the first sliding seat (45) is provided with a main rotating shaft (41) rotatably connected to it, the reducer assembly (46) is installed on the top of the first sliding seat (45), and a transmission component (47) is provided between the output shaft of the reducer assembly (46) and the main rotating shaft (41), the transmission component (47) being a chain; the drive motor (42) is connected to the reducer assembly (46), and the drive motor... (42) During operation, the main rotating shaft (41) rotates relative to the first sliding seat (45), and the end of the main rotating shaft (41) is provided with a first rotating frame (44) fixedly connected to it; the driven rotating device (5) also includes a second sliding seat (52), a second cylinder (53) and a driven rotating shaft (54), the second sliding seat (52) is slidably connected to the main frame (1); the second cylinder (53) is fixedly installed on the main frame (1), and the piston shaft of the second cylinder (53) is connected to the second sliding seat (52); the second sliding seat (52) is provided with a driven rotating shaft (54) rotatably connected to it, and the end of the driven rotating shaft (54) is provided with a second rotating frame (51) that rotates synchronously with it.

7. The flipping device for a material frame according to claim 6, characterized in that, The main frame (1) is provided with a pair of first tracks (9), and the first sliding seat (45) is slidably installed on the first track (9); the main frame (1) is provided with a pair of second tracks (10), and the second sliding seat (52) is slidably installed on the second track (10); the first rotating frame (44) and the second rotating frame (51) are symmetrically arranged on the left and right sides of the main frame (1), and the edges of the first rotating frame (44) and the second rotating frame (51) are provided with several clamping plates (11).

8. The flipping device for a material frame according to claim 6, characterized in that, The end of the main rotating shaft (41) is provided with two angle contact members (48) arranged side by side and staggered, and there is an included angle between the two angle contact members (48); the first sliding seat (45) is provided with two second contact switches (49) arranged side by side, and each second contact switch (49) is paired with its adjacent angle contact member (48); when the main rotating shaft (41) rotates, the angle contact member (48) presses against the contact point on the second contact switch (49).

9. The flipping device for a material frame according to claim 6, characterized in that, The second sliding seat (52) is provided with a limiting cylinder (55) that is perpendicular to the second rotating frame (51), and a limiting rod (56) is provided on the piston shaft of the limiting cylinder (55); the second rotating frame (51) is provided with a limiting hole (57), and the diameter of the limiting hole (57) is adapted to the outer diameter of the limiting rod (56); when the second rotating frame (51) is in a vertical upright state, the limiting hole (57) and the limiting rod (56) are aligned; the second sliding seat (52) is also provided with a proximity switch (58), and the second rotating frame (51) is provided with a detection hole (59) that matches the proximity switch (58); when the second rotating frame (51) is in a vertical upright state, the detection hole (59) and the proximity switch (58) are aligned.

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