Material bearing device adaptive to wave plates of multiple sizes and specifications

By designing a material-bearing device that can adapt to various sizes of wave plates, the problems of equipment downtime for changing and sticking in the wave plate production line were solved, achieving rapid adaptation and efficient automated feeding, thus improving production efficiency and reliability.

CN121948145APending Publication Date: 2026-05-01SICHUAN FERROTEC TECH DEV CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SICHUAN FERROTEC TECH DEV CO LTD
Filing Date
2026-02-06
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing waveplate feeding and positioning equipment is usually designed for a single fixed specification. This means that the production line needs to stop to replace support components when changing to different specifications of waveplates, which reduces production efficiency and increases the risk of human error. In addition, the smooth surface of the waveplates makes them easy to stick, causing the robotic arm to grab multiple pieces, which affects the continuity and yield of automated production.

Method used

A material receiving device adapted to wave plates of various sizes was designed, including a frame assembly, an active assembly, a driven assembly, a material rod assembly, and a material receiving tray. Through a gear transmission system and a hollow material rod with ventilation holes, it can quickly adapt to wave plates of different sizes and prevent sticking. The modular components and knob drive make operation simple.

Benefits of technology

It enables rapid switching and continuous automated operation in waveplate production, improves production efficiency, reduces the risk of positioning errors and the probability of the robotic arm grabbing multiple waveplates, simplifies equipment manufacturing and maintenance, and enhances the reliability of automated feeding.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of wave plate processing, in particular to a material bearing device adaptive to wave plates of multiple sizes and specifications, which comprises a rack assembly, a driving assembly, a driven assembly, a material rod assembly and a material bearing disc, the driving assembly is arranged on the rack assembly and can drive the driven assembly to rotate. The driven assembly is arranged on the rack assembly and connected with the material rod assembly. Wave plates can be placed on the material bearing disc, limiting grooves are formed in the material bearing disc, and the limiting grooves are evenly distributed along the center of the material bearing disc. The material rod assembly can penetrate through the limiting groove and is driven by the driven assembly to move in the limiting groove, the material rod assembly can limit the wave plate, the whole device is composed of the machine frame, the driving assembly, the driven assembly, the material rod and other modular assemblies, the connection relation between the parts is clear, the gear system can be driven through the rotary knob, the cam set is driven to conduct synchronous adjustment, and operation is visual, easy and convenient. Due to the simple and efficient design, the manufacturing, assembling and subsequent maintenance cost of the equipment is reduced, and good practicability and economical efficiency are embodied.
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Description

A material receiving device adaptable to wave plates of various sizes and specifications Technical Field

[0001] This invention relates to the field of waveplate processing technology, specifically a material-bearing device adapted to waveplates of various sizes and specifications. Background Technology

[0002] In the fields of optics and semiconductor manufacturing, waveplates, as key optical components capable of altering the polarization state of light waves, are widely used in various precision equipment such as laser processing, optical inspection, and photolithography machines. Different applications have varying requirements for parameters such as waveplate size and phase delay, thus requiring the handling of waveplates of various specifications in actual production. However, existing waveplate loading and positioning equipment is typically designed for a single, fixed specification, with its support components tightly coupled to the waveplate dimensions.

[0003] When different specifications of waveplates need to be replaced on the production line, the machine must be stopped and the corresponding support components must be replaced manually. This process not only reduces production efficiency and increases the labor intensity of operators, but also introduces a high risk of human error due to frequent operation.

[0004] Furthermore, due to the smooth and flat surface of the waveplates, they are prone to sticking together during stacking or gripping due to electrostatic or vacuum adsorption forces. This can cause the robotic arm to grasp multiple waveplates at once, resulting in feeding failures or even product damage, severely impacting the continuity of automated production and product yield. These technical bottlenecks restrict the development of optical component production lines towards greater flexibility and intelligence. Summary of the Invention

[0005] The purpose of this invention is to provide a material receiving device that is compatible with wave plates of various sizes, in order to address the problems mentioned above.

[0006] The technical solution adopted in this invention is as follows: a material receiving device adapted to corrugated sheets of multiple sizes, comprising a frame assembly, an active assembly, a driven assembly, a material rod assembly, and a material receiving tray;

[0007] The active component is mounted on the frame assembly and can drive the driven component to rotate;

[0008] The driven component is mounted on the frame assembly and is connected to the feed rod assembly;

[0009] The material receiving tray can hold corrugated sheets, and the material receiving tray is provided with limiting grooves, which are evenly distributed along the center of the material receiving tray.

[0010] The feed rod assembly can pass through the limiting groove and move within the limiting groove under the drive of the driven assembly, and the feed rod assembly can limit the waveplate.

[0011] Furthermore, the rack assembly includes side plates, a top plate, and a bottom plate;

[0012] The top of the side plate is connected to the top plate, and the bottom of the side plate is connected to the bottom plate.

[0013] The active component is mounted on the base plate;

[0014] The driven component is located on the top plate.

[0015] Furthermore, the active component includes a knob, a gear shaft, and a drive gear;

[0016] The gear shaft passes through the base plate and is connected to and locked to the knob by a set screw.

[0017] The knob is located below the base plate;

[0018] The driving gear is mounted on the gear shaft and can rotate together with the gear shaft. The driving gear can drive the driven component to rotate.

[0019] Furthermore, the active component also includes an end bearing, which is located at the other end of the gear shaft and is positioned on one side by the upper shoulder of the gear shaft. The end bearing is located between the top plate and the bottom plate.

[0020] Furthermore, the frame assembly also includes a locking block and a clamping handle. The locking block is located at the bottom of the base plate and is locked to the base plate by hexagon socket head cap screws for installing and fixing the base plate.

[0021] The clamping handle is located on the locking block.

[0022] Furthermore, the driven assembly includes a bearing housing, a driven gear, and a driven shaft;

[0023] The bearing housing is installed at the lower part of the top plate;

[0024] The driven gear can mesh with the driving gear and can be driven by the driving gear to rotate together;

[0025] The driven shaft passes through the bearing housing and the driven gear, and is connected to the feed bar assembly.

[0026] Furthermore, the driven assembly also includes a locking washer and a fixing block, the fixing block being located on the side of the driven gear away from the bearing housing, and the locking washer being located on the side of the fixing block away from the driven gear;

[0027] The driven gear includes a first driven gear and a second driven gear, and the first driven gear and the second driven gear are installed in a misaligned manner with a mounting hole deviation of °.

[0028] The bearing housing is provided with a second bearing and a third bearing. The second bearing is installed at the connection between the step on one side of the driven shaft and one end of the bearing housing, and the third bearing is installed at the step at the other end of the bearing housing.

[0029] Furthermore, the feed bar assembly includes a feed bar and a rotating block;

[0030] The rotating block has an eccentric cam structure, with the bottom center of the rotating block connected to the driven shaft and one side of the top of the rotating block connected to the material rod;

[0031] The feed rod can pass through the feed tray.

[0032] Furthermore, the material rod has a hollow structure, with an air supply pipe connected to the bottom of the material rod, and a speed control valve is installed along the air supply pipe. A vent hole is provided on the section of the material rod located above the material receiving plate.

[0033] The beneficial effects of the present invention include at least one of the following;

[0034] 1. A material-bearing device for adapting to multiple sizes of corrugated sheets, comprising a frame assembly, an active assembly, a driven assembly, a material rod assembly, and a material-bearing tray, is provided. This device can quickly adapt to corrugated sheets of different sizes, eliminating the need for machine downtime and manual replacement of support components due to product changes. This directly solves the problem of low production efficiency mentioned in the background art, enabling rapid production changeover and continuous automated operation, and significantly improving the overall efficiency of the production line.

[0035] 2. By installing the first and second driven wheels at a slight angle offset before meshing with the driving gear shaft, the backlash present in conventional gear transmissions is effectively eliminated. This design improves the smoothness and accuracy of the entire mechanism during adjustment and operation, provides a reliable guarantee for the precise positioning of the waveplate, and reduces the risk of positioning errors caused by mechanism wobbling.

[0036] 3. The feed rod is designed with a hollow structure and ventilation holes at the top. During operation, gas is continuously introduced into the feed rod, and the airflow exits through the ventilation holes, forming an air cushion isolation effect in the corrugated sheet stacking area. This ingenious design directly overcomes the problem of corrugated sheets sticking together due to their smooth surface, effectively preventing the robot arm from grabbing multiple sheets at once, and greatly improving the success rate and reliability of automated feeding.

[0037] 4. The entire device consists of modular components such as a frame, driving mechanism, driven mechanism, and feed bar. The connections between components are clear, and the gear system can be driven by a knob to synchronously adjust the cam assembly, making operation intuitive and simple. This simple and efficient design reduces the manufacturing, assembly, and subsequent maintenance costs of the equipment, demonstrating excellent practicality and economy. Attached Figure Description

[0038] Figure 1 is a three-dimensional structural diagram of a material receiving device that can accommodate corrugated sheets of various sizes;

[0039] Figure 2 is a schematic diagram of the top structure of a material receiving device that can accommodate corrugated sheets of various sizes;

[0040] Figure 3 is a schematic diagram of the driven component and the bar assembly;

[0041] Figure 4 is a three-dimensional structural diagram of the driven component and the bar assembly;

[0042] Figure 5 is a magnified structural diagram of region A in Figure 4;

[0043] Figure 6 is a schematic diagram of the cross-sectional structure of the rack assembly;

[0044] Figure 7 is a schematic diagram of the active component structure;

[0045] Figure 8 is a schematic diagram of the cross-sectional structure of the driven component;

[0046] Figure 9 is a schematic diagram of the cross-sectional structure of the bar assembly;

[0047] Figure 10 is a schematic diagram of a material receiving device that can accommodate corrugated sheets of various sizes.

[0048] In the picture:

[0049] 1 is a side plate, 2 is a top plate, 3 is a bottom plate, 4 is a knob, 5 is a locking block, 6 is a clamping handle, 7 is a material rod assembly, 8 is a material receiving plate, 9 is a limiting groove, 10 is a gear shaft, 11 is a driving gear, 12 is a material rod, 13 is a vent hole, 14 is a rotating block, 15 is a speed control valve, 16 is a bearing seat, 1601 is a second bearing, 1602 is a third bearing, 17 is a driven gear, 1701 is a first driven gear, 1702 is a second driven gear, 18 is a first bearing, 19 is a retaining ring for the hole, 20 is an end bearing, 21 is a locking washer, 22 is a fixing block, 23 is a driven shaft, and 24 is a retaining ring for the shaft. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described in the accompanying drawings can generally be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0053] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0054] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0055] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0056] As shown in Figures 1 and 10, a material receiving device adapted to corrugated sheets of multiple sizes includes a frame assembly, an active assembly, a driven assembly, a material rod assembly 7, and a material receiving plate 8.

[0057] The active component is mounted on the frame assembly and can drive the driven component to rotate;

[0058] The driven component is mounted on the frame assembly and is connected to the feed rod assembly 7;

[0059] The material receiving tray 8 can hold corrugated sheets, and the material receiving tray 8 is provided with limiting grooves 9, which are evenly distributed along the center of the material receiving tray 8.

[0060] The feed rod assembly 7 can pass through the limiting groove 9 and move within the limiting groove 9 under the drive of the driven assembly, and the feed rod assembly 7 can limit the waveplate.

[0061] The purpose of this design is to provide a material-bearing device that adapts to multiple sizes of corrugated sheets, including a frame assembly, an active assembly, a driven assembly, a material rod assembly, and a material-bearing tray. This device can quickly adapt to different sizes of corrugated sheets without requiring downtime and manual replacement of support components due to product changes. This directly solves the problem of low production efficiency mentioned in the background technology, enabling rapid production changeover and continuous automated operation, and significantly improving the overall efficiency of the production line.

[0062] Meanwhile, as shown in FIG6, this embodiment provides a specific structure of a rack assembly, wherein the rack assembly includes a side plate 1, a top plate 2 and a bottom plate 3;

[0063] The top of the side plate 1 is connected to the top plate 2, and the bottom of the side plate 1 is connected to the bottom plate 3;

[0064] The active component is mounted on the base plate 3;

[0065] The driven component is located on the top plate 2.

[0066] Additionally, the frame assembly also includes a first bearing 18 and a retaining ring 19 for the bore;

[0067] The first bearing 18 is mounted on the base plate 3, and the gear shaft 10 passes through the first bearing 18;

[0068] The elastic retaining ring 19 for the hole is provided inside the top plate 2, and the elastic retaining ring 19 for the hole can be fitted around the outer circumference of the gear shaft 10.

[0069] The purpose of this design is to form a stable frame structure through the side plates, top plate and bottom plate. The top plate is used to support the driven components and the feed rod assembly, and the bottom plate is used to support the driving components and provide mounting for the frame assembly. In most cases, a shaft elastic retaining ring 24 is set at the connection between the bottom plate and the gear shaft.

[0070] Meanwhile, the provided holes are fitted with elastic retaining rings and a first bearing for the subsequent installation of the active components.

[0071] Furthermore, the frame assembly also includes a locking block 5 and a clamping handle 6. The locking block 5 is located at the lower part of the base plate 3 and is locked to the base plate 3 by an internal hexagonal head screw for installing and fixing the base plate 3.

[0072] The clamping handle 6 is located on the locking block 5.

[0073] The purpose of this design is to use locking blocks and clamping handles to work with the base plate to complete the installation of the entire rack assembly.

[0074] In this embodiment, as shown in FIG7, the active component includes a knob 4, a gear shaft 10, and an active gear 11;

[0075] The gear shaft 10 passes through the base plate 3, and the gear shaft 10 is connected to and locked to the knob 4 by a set screw;

[0076] The knob 4 is located below the base plate 3;

[0077] The driving gear 11 is mounted on the gear shaft 10 and can rotate together with the gear shaft 10. The driving gear 11 can drive the driven component to rotate.

[0078] Meanwhile, the active component also includes an end bearing 20, which is located at the other end of the gear shaft 10 and is positioned on one side by the upper shoulder of the gear shaft 10. The end bearing 20 is located between the top plate 2 and the bottom plate 3.

[0079] The purpose of this design is that the driving gear rotates under the drive of the gear shaft, so that the driven gear can also rotate, thereby adjusting the specific opening structure of the material bar assembly to meet the needs of using wave plates of various sizes.

[0080] It should be noted that in actual use, the knob can be rotated manually or by motor, thereby driving the gear shaft to rotate.

[0081] In this embodiment, as shown in Figures 3 and 8, the driven component includes a bearing housing 16, a driven gear 17, and a driven shaft 23;

[0082] The bearing housing 16 is installed on the lower part of the top plate 2;

[0083] The driven gear 17 can mesh with the driving gear 11 and can be driven by the driving gear 11 to rotate together;

[0084] The driven shaft 23 passes through the bearing housing 16 and the driven gear 17, and is connected to the feed rod assembly 7.

[0085] Meanwhile, the driven assembly also includes a locking washer 21 and a fixing block 22. The fixing block 22 is located on the side of the driven gear 17 away from the bearing seat 16, and the locking washer 21 is located on the side of the fixing block 22 away from the driven gear 17.

[0086] The driven gear 17 includes a first driven gear 1701 and a second driven gear 1702, and the first driven gear 1701 and the second driven gear 1702 are installed in a staggered manner with a mounting hole deviation of 1°.

[0087] The bearing housing 16 is provided with a second bearing 1601 and a third bearing 1602. The second bearing 1601 is installed at the connection between the step on one side of the driven shaft 23 and one end of the bearing housing 16, and the third bearing 1602 is installed at the step at the other end of the bearing housing 16.

[0088] The purpose of this design is to effectively eliminate the backlash present in conventional gear transmissions by installing the first and second driven wheels at a slight angle and then meshing them with the driving gear shaft. This design improves the smoothness and accuracy of the entire mechanism during adjustment and operation, provides a reliable guarantee for the precise positioning of the waveplate, and reduces the risk of positioning errors caused by mechanism wobbling.

[0089] In this embodiment, as shown in Figures 2 to 5 and Figure 9, the material rod assembly 7 includes a material rod 12 and a rotating block 14;

[0090] The rotating block 14 is an eccentric cam structure. The bottom center of the rotating block 14 is connected to the driven shaft 23, and one side of the top of the rotating block 14 is connected to the material rod 12.

[0091] The feed rod 12 can pass through the feed plate 8.

[0092] Meanwhile, the material rod 12 has a hollow structure, and an air supply pipe is connected to the bottom of the material rod 12. A speed control valve 15 is installed in the air supply pipe, and a ventilation hole 13 is provided on the section of the material rod 12 above the material receiving plate 8.

[0093] The purpose of this design is to create a hollow material bar with ventilation holes at the top. During operation, gas is continuously introduced into the material bar, and the airflow exits through the ventilation holes, forming an air cushion isolation effect in the corrugated sheet stacking area. This ingenious design directly overcomes the problem of corrugated sheets sticking together due to their smooth surface, effectively preventing the robotic arm from grabbing multiple sheets at once, and greatly improving the success rate and reliability of automated feeding.

[0094] Furthermore, the entire device is composed of modular components such as a frame, drive mechanism, driven mechanism, and feed bar. The connections between components are clear, and the gear system can be driven by a knob to synchronously adjust the cam assembly, making operation intuitive and simple. This simple and efficient design reduces the manufacturing, assembly, and subsequent maintenance costs of the equipment, demonstrating excellent practicality and economy.

[0095] It should be noted that the structure of three sets of driven gears and three sets of material rods used in this embodiment is as follows: the three sets of driven gears are arranged around the outer periphery of the driving gear, and the centers of the three sets of driven gears form an equilateral triangle. The center of the driving gear is located at the center of the equilateral triangle structure. In order to adapt to this structure, three sets of limiting grooves are provided on the material receiving plate, and the structure of the limiting grooves is arc-shaped, which is used to adapt to the arc movement of the material rod. The installation of the material receiving plate is not shown in Figure 2. Since its position is relatively stationary compared to the material rod assembly, it can be externally connected to a support structure to play a supporting role.

[0096] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A material receiving device adaptable to corrugated sheets of multiple sizes, characterized in that, It includes a frame assembly, an active assembly, a driven assembly, a feed rod assembly (7), and a receiving tray (8); the active assembly is located on the frame assembly and can drive the driven assembly to rotate; the driven assembly is located on the frame assembly and is connected to the feed rod assembly (7); the receiving tray (8) can hold a wave plate, and the receiving tray (8) is provided with a limiting groove (9), and the limiting groove (9) is evenly arranged along the center of the receiving tray (8); the feed rod assembly (7) can pass through the limiting groove (9) and move in the limiting groove (9) under the drive of the driven assembly, and the feed rod assembly (7) can limit the wave plate.

2. The material receiving device for adapting to corrugated sheets of multiple sizes according to claim 1, characterized in that, The frame assembly includes a side plate (1), a top plate (2), and a bottom plate (3); the top of the side plate (1) is connected to the top plate (2), and the bottom of the side plate (1) is connected to the bottom plate (3); the active component is located on the bottom plate (3); and the driven component is located on the top plate (2).

3. The material receiving device for adapting to corrugated sheets of multiple sizes according to claim 2, characterized in that, The active component includes a knob (4), a gear shaft (10), and a drive gear (11); the gear shaft (10) passes through the base plate (3), and the gear shaft (10) is connected to and locked to the knob (4) by a set screw; the knob (4) is located below the base plate (3); the drive gear (11) is located on the gear shaft (10) and can rotate together with the gear shaft (10), and the drive gear (11) can drive the driven component to rotate.

4. A material receiving device adaptable to corrugated sheets of multiple sizes according to claim 3, characterized in that, The active component also includes an end bearing (20), which is located at the other end of the gear shaft (10) and is positioned on one side by the upper shoulder of the gear shaft (10). The end bearing (20) is located between the top plate (2) and the bottom plate (3).

5. A material receiving device adaptable to corrugated sheets of multiple sizes according to claim 3, characterized in that, The frame assembly also includes a first bearing (18) and a retaining ring (19) for the hole; the first bearing (18) is disposed on the base plate (3), and the gear shaft (10) passes through the first bearing (18); the retaining ring (19) for the hole is disposed in the top plate (2), and the retaining ring (19) for the hole can be fitted around the outer circumference of the gear shaft (10).

6. A material receiving device for adapting to corrugated sheets of multiple sizes according to claim 3, characterized in that, The frame assembly also includes a locking block (5) and a clamping handle (6). The locking block (5) is located at the lower part of the base plate (3) and is locked to the base plate (3) by an internal hexagonal head screw for installing and fixing the base plate (3). The clamping handle (6) is located on the locking block (5).

7. A material receiving device adaptable to corrugated sheets of multiple sizes according to claim 3, characterized in that, The driven assembly includes a bearing housing (16), a driven gear (17), and a driven shaft (23); the bearing housing (16) is installed on the lower part of the top plate (2); the driven gear (17) can mesh with the driving gear (11) and can be driven by the driving gear (11) to rotate together; the driven shaft (23) passes through the bearing housing (16) and the driven gear (17) and is connected to the material rod assembly (7).

8. A material receiving device for adapting to corrugated sheets of multiple sizes according to claim 7, characterized in that, The driven assembly further includes a locking washer (21) and a fixing block (22). The fixing block (22) is located on the side of the driven gear (17) away from the bearing seat (16), and the locking washer (21) is located on the side of the fixing block (22) away from the driven gear (17). The driven gear (17) includes a first driven gear (1701) and a second driven gear (1702), and the first driven gear (1701) and the second driven gear (1702) are installed in a staggered manner with a hole deviation of 1°. The bearing seat (16) is provided with a second bearing (1601) and a third bearing (1602). The second bearing (1601) is installed at the connection between the step on one side of the driven shaft (23) and one end of the bearing seat (16), and the third bearing (1602) is installed at the hole step at the other end of the bearing seat (16).

9. A material receiving device for adapting to corrugated sheets of multiple sizes according to claim 7, characterized in that, The feed rod assembly (7) includes a feed rod (12) and a rotating block (14); the rotating block (14) is an eccentric cam structure, the bottom center of the rotating block (14) is connected to the driven shaft (23), and one side of the top of the rotating block (14) is connected to the feed rod (12); the feed rod (12) can pass through the material receiving plate (8).

10. A material receiving device for adapting to corrugated sheets of multiple sizes according to claim 9, characterized in that, The material rod (12) has a hollow structure. An air supply pipe is connected to the bottom of the material rod (12), and a speed control valve (15) is provided in the air supply pipe. A ventilation hole (13) is provided on the section of the material rod (12) above the material receiving plate (8).