A variable adsorption width vacuum transmission mechanism

Abstract

The present invention discloses a variable adsorption width vacuum transmission mechanism, which is characterized by comprising a vacuum adsorption mechanism and a transmission mechanism, wherein the vacuum adsorption mechanism comprises a vacuum pipe and a diversion fan-shaped port, an adsorption width adjustment mechanism is arranged in the diversion fan-shaped port, and the adsorption width adjustment mechanism comprises a retractable flexible folding cloth and a retracting mechanism, wherein two retractable flexible folding cloths are arranged respectively on the left and right sides of the diversion fan-shaped port, and are used to block the first air suction holes on the left and right sides of the fan-shaped groove bottom, and the retracting mechanism can drive the left and right retractable flexible folding cloths to retract synchronously and linearly in opposite directions, thereby adjusting the effective adsorption width of the diversion fan-shaped port. The present invention can quickly and conveniently adjust the effective adsorption width of the diversion fan-shaped port by arranging the adsorption width adjustment mechanism, and effectively solves the problems of unstable vacuum, asynchronous transmission and tension fluctuation caused by the mismatch between the effective adsorption width and the material width during the operation of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of transmission of flexible materials, and in particular to a variable adsorption width vacuum transmission mechanism. Background Art

[0002] With the rapid development of materials such as lithium batteries, optics, photovoltaics, shielding and electronics, coating technology has become an indispensable processing method for flexible materials. Light, thin, short and small have become the technical core of current materials. It is particularly important to achieve low-tension operation of these materials and reduce residual stress to ensure high-end quality of products.

[0003] The main transmission methods for flexible materials are currently pressing transmission, S-type friction transmission, vacuum adsorption transmission, etc. For single-sided non-contact transmission, vacuum adsorption transmission is mainly used to achieve the purpose of non-destructive transportation of the material surface. The vacuum adsorption wheels currently used in the market mainly transmit materials through a wheel surface with a fixed width. However, in the actual production process, the vacuum suction wheel is a mechanical structure. Once manufactured and installed, its width cannot be changed, while the width of the material varies greatly. When the material width is smaller than the vacuum wheel surface adsorption width, a large negative pressure will appear in the wheel surface adsorption area that is larger than the material width, generating noise. At the same time, the adsorbed material becomes out of sync with the wheel due to the reduced adsorption force, resulting in slippage, which in turn affects the tension control and causes the material to produce large residual stresses such as tensile stress.

[0004] Therefore, how to conveniently and quickly adjust the effective adsorption width of the vacuum suction wheel to be the same as the material width, ensure the synchronization of material operation, achieve low-tension operation, and make the material reach low residual stress has become an urgent problem to be solved in vacuum adsorption transmission. Summary of the invention

[0005] In order to solve the problems of unstable vacuum, asynchronous transmission and tension fluctuation caused by the inconsistency between the effective adsorption width of the existing vacuum adsorption wheel and the material width, the present invention provides a variable adsorption width vacuum transmission mechanism, so that any width smaller than the mechanical width of the vacuum adsorption wheel can become the effective adsorption width to meet the width requirements of different materials.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] 14. The vacuum transmission mechanism of claim 13, wherein the vacuum transmission mechanism comprises a vacuum adsorption mechanism and a transmission mechanism, wherein the vacuum adsorption mechanism comprises a vacuum pipe and a guide fan-shaped opening, wherein the transmission mechanism comprises a transmission shaft, a transmission opening wheel surface and a metal outer mesh, wherein the vacuum pipe comprises a vacuum pipe and a vacuum cavity pipe, wherein the left end of the vacuum cavity pipe is provided with a left sealing plate, and the right end is provided with a right sealing plate, wherein the left side surface of the left sealing plate and the right side surface of the right sealing plate are both provided with a cylindrical portion extending outward, and the cylindrical portion is both sleeved with a rolling bearing. The right end of the vacuum pipe is inserted into the left sealing plate, and the interior is communicated with the inner cavity of the vacuum cavity pipe, and the left end is connected to a vacuum pumping device, wherein a fan-shaped groove penetrating both ends is provided on one side wall of the vacuum cavity pipe along the axial direction, wherein a plurality of evenly distributed first suction holes are provided on the bottom of the fan-shaped groove, and two fan-shaped blocking columns are fixedly connected to the two sides of the fan-shaped groove, and a guide fan-shaped opening is formed between the fan-shaped groove and the two fan-shaped blocking columns;

[0008] The transmission perforated wheel surface is a cylindrical sleeve with a closed right end, which is sleeved on the outside of the vacuum cavity tube. The two ends of the inner hole of the transmission perforated wheel surface are respectively fastened to the outer rings of rolling bearings at both ends, so that the transmission perforated wheel surface and the vacuum pipe are rotatably connected. The metal outer net is sleeved on the outer side of the transmission perforated wheel surface. The transmission perforated wheel surface is provided with a plurality of second air suction holes evenly distributed in a circular array. The two ends of the transmission perforated wheel surface are respectively provided with a left end cover and a right end cover. The right end surface of the transmission perforated wheel surface is fixedly connected to the right end cover, and the left end cover is fixedly connected to the cylindrical part of the left sealing plate. The left end of the transmission shaft is fixedly connected to the right end cover, and the other end is connected to the motor. The rotation of the transmission shaft can drive the transmission perforated wheel surface and the metal outer net to rotate synchronously together;

[0009] An adsorption width adjustment mechanism is provided in the guide fan-shaped mouth, and the adsorption width adjustment mechanism includes a retractable flexible folding cloth and a retractable mechanism. The retractable flexible folding cloth is provided with two pieces, which are respectively arranged on the left and right sides of the guide fan-shaped mouth. The left end surface of the left retractable flexible folding cloth is fixedly connected to the left sealing plate, and the right end surface of the right retractable flexible folding cloth is fixedly connected to the right sealing plate, which is used to block the first suction holes on the left and right sides of the fan-shaped groove bottom. The retractable mechanism can drive the left and right pieces of retractable flexible folding cloth to retract linearly in opposite directions synchronously, thereby adjusting the effective adsorption width of the guide fan-shaped mouth.

[0010] Preferably, the inner wall of the inner cavity of the vacuum cavity tube is composed of an arc wall and a plane wall, and the fan-shaped groove is arranged on the outer surface of the plane wall.

[0011] Preferably, the telescopic mechanism adopts a bidirectional screw linear movement mechanism, including a screw, a screw nut and a mounting plate. The right side of the left telescopic flexible folding cloth and the left side of the right telescopic flexible folding cloth are both provided with connecting plates. The mounting plate is configured to be fan-shaped to match the shape of the guide fan-shaped opening, and is provided with two pieces, which are respectively fixedly connected to the left connecting plate and the right connecting plate. The screw nut is provided with two pieces, which are respectively fixedly connected to the right side of the left mounting plate and the left side of the right mounting plate. The screw is provided in the middle of the guide fan-shaped opening, and the axis is aligned with the vacuum chamber. The pipe axis is parallel, and both ends are provided with external threads with opposite spiral directions. Two screw nuts are respectively threadedly connected with the external threads on the left end and the right end of the screw. The two ends of the screw are respectively connected with the left sealing plate and the right sealing plate to form a rotatable but non-linear movement left and right connection, and the left end passes through the left sealing plate and the left end cover. An inner hexagonal groove is provided on the left end surface, which is convenient for rotating the screw with an inner hexagonal wrench. Rotating the screw can drive the two screw nuts to move in a straight line toward or away from each other, thereby driving the two retractable flexible folding cloths to synchronously retract in a straight line toward or away from each other, so that the suction width of the guide fan-shaped opening is reduced or expanded.

[0012] Preferably, two annular grooves are provided on the outer circular surface of the left end of the screw rod, and a retaining spring is provided in each of the two annular grooves. The right side of one retaining spring is connected to the left side of the left sealing plate, and the left side of the other retaining spring is connected to the right side of the left sealing plate, so that the screw rod and the left sealing plate form a rotatable but non-linearly movable connection. A blind hole is provided on the right sealing plate at a position corresponding to the screw rod, and the right end of the screw rod is inserted into the blind hole.

[0013] Preferably, the adsorption width adjustment mechanism also includes a guide slide bar, and the upper and lower outer sides of the mounting plate are respectively provided with side wings extending upward and downward, and the middle of the fan-shaped baffle column and the corresponding positions of the two side wings are provided with matching rectangular slide grooves, and the right side surface of the side wing of the left mounting plate and the left side surface of the side wing of the right mounting plate are fixedly connected with a slide bar, and guide holes are provided on the slide bar and the side wings, and the guide slide bar is provided with two pieces, and the axes of the two guide slide bars are arranged parallel to the axis of the screw rod, and pass through the left and right corresponding guide holes respectively, and the two ends are respectively fixedly connected to the left sealing plate and the right sealing plate.

[0014] Preferably, the inner side of the retractable flexible folding cloth is connected with a plurality of circular rings through a support rod. The circular rings are coaxial with the screw rod, have an outer diameter greater than that of the screw rod, and are sleeved on the outer side of the screw rod.

[0015] Preferably, a flange is provided at the left end of the transmission shaft, and the flange is fixedly connected to the right end cover.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1) When the vacuum pipeline is working, the negative pressure is transmitted to the transmission hole wheel surface and the metal outer net through the diversion fan-shaped mouth, so that the flexible material is adsorbed on the surface of the metal outer net. The metal outer net rotates with the transmission shaft to realize the continuous transmission demand of the material. This transmission mode only acts on one side of the flexible material with friction, and the other side has no direct or indirect contact such as compression, adsorption or friction, so as to better ensure that the surface of the material is not damaged, so as to ensure coating, liquid evaporation and non-contact transmission in multiple working conditions; 2) By setting the adsorption width adjustment mechanism, the effective adsorption width of the diversion fan-shaped mouth can be adjusted quickly and conveniently. The invention solves the problems of unstable vacuum, asynchronous transmission and tension fluctuation caused by the inconsistency between the effective adsorption width of the existing vacuum adsorption wheel and the material width, so that any width smaller than the mechanical width of the vacuum adsorption wheel can become the effective adsorption width to meet the width requirements of different materials, saving the cost of multiple vacuum suction wheels corresponding to the widths of different materials in the prior art; 3) a bidirectional screw linear moving mechanism is adopted, which has high adjustment accuracy and simple structure. The screw rotation adjustment end is arranged at the fixed end of the left end cover, which is easy to operate; 4) by setting a guide slide rod, the telescopic flexible folding cloth on the left and right sides can be telescoped more smoothly, and the telescopic direction does not deviate, thereby improving the practicality of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention (without the transmission hole wheel surface and the metal mesh);

[0018] Figure 2 for Figure 1 A-A section view;

[0019] Figure 3 This is a schematic diagram of the vacuum pipeline structure according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the cross-sectional structure of the vacuum chamber tube and the fan-shaped baffle column according to an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the telescopic mechanism and the guide slide rod structure of an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of the mounting plate according to an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the structure of a retractable flexible folding cloth according to an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the external structure of an embodiment of the present invention;

[0025] Fig. 9 This is a working status diagram of an embodiment of the present invention.

[0026] In the figure: 1. vacuum pipe, 101. vacuum tube, 102. vacuum cavity tube, 1021. inner cavity, 1022. fan-shaped groove, 1023. first suction hole, 103. left side plate, 1031. cylindrical part, 104. right side plate, 1041. cylindrical part, 2. left end cover, 3. rolling bearing, 4. right end cover, 5. transmission shaft, 501. flange, 6. adsorption width adjustment mechanism, 601. retractable flexible folding cloth, 6011. connecting plate, 602. screw rod, 603. screw rod nut, 604. mounting plate, 6041. side wing, 605. slider, 606. guide slide rod, 607. retaining spring, 608. screw rod rotating end, 7. fan-shaped blocking column, 701. rectangular slide groove, 8. diversion fan-shaped mouth, 9. transmission opening wheel surface, 901. second suction hole. DETAILED DESCRIPTION

[0027] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] 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.

[0030] like Figures 1 to 8As shown, the embodiment of the present invention includes a vacuum adsorption mechanism and a transmission mechanism, wherein the vacuum adsorption mechanism includes a vacuum pipe 1 and a diversion fan-shaped port 8, the transmission mechanism includes a transmission shaft 5, a transmission hole wheel surface 9 and a metal outer net, the vacuum pipe 1 includes a vacuum pipe 101 and a vacuum cavity pipe 102, the vacuum cavity pipe 102 is provided with a left sealing plate 103 at the left end, and a cylindrical portion 1031 extending outward on the left side of the left sealing plate 103, and a right sealing plate 104 is provided at the right end, and a cylindrical portion 1041 extending outward on the right side of the right sealing plate 104, and the cylindrical portion 10 Rolling bearings 3 are sleeved on 31 and 1041. The right end of the vacuum tube 101 is inserted into the left sealing plate 103, and the interior is communicated with the inner cavity 1021 of the vacuum chamber tube 102. The left end is connected to the vacuum pumping device. A fan-shaped groove 1022 that passes through both ends is opened on one side wall of the vacuum chamber tube 102 along the axial direction. A plurality of evenly distributed first air suction holes 1023 are opened on the bottom of the fan-shaped groove 1022. Two fan-shaped blocking columns 7 are fixedly connected on both sides of the fan-shaped groove 1022. A guide fan-shaped opening 8 is formed between the fan-shaped groove 1022 and the two fan-shaped blocking columns 7.

[0031] The transmission hole wheel surface 9 is a cylindrical sleeve with a closed right end, which is sleeved on the outside of the vacuum cavity tube 102. The two ends of the inner hole of the transmission hole wheel surface 9 are respectively fastened to the outer rings of the rolling bearings 3 at both ends, so that the transmission hole wheel surface 9 and the vacuum pipe 1 are rotatably connected. The metal outer net (not shown in the attached figure) is sleeved on the outer surface of the transmission hole wheel surface 9. The transmission hole wheel surface 9 is provided with a plurality of second suction holes 901 evenly distributed in a circular array. The two ends of the transmission hole wheel surface 9 are respectively provided with a left end cover 2 and a right end cover 4. The right end face of the transmission hole wheel surface 9 is fixedly connected to the right end cover 4, and the left end cover 2 is fixedly connected to the left sealing plate cylindrical portion 1031. The left end of the transmission shaft 5 is provided with a flange 501, which is fixedly connected to the right end cover 4, and the other end is connected to the motor. The rotation of the transmission shaft 5 can drive the transmission hole wheel surface 9 and the metal outer net to rotate synchronously, and the vacuum pipe 1, the fan-shaped blocking column 7 and the left end cover 2 are stationary;

[0032] When the vacuum pipe 1 is working, the negative pressure is transmitted to the transmission hole wheel surface 9 and the metal outer net through the guide fan-shaped port 8, so that the flexible material is adsorbed on the surface of the metal outer net. The metal outer net rotates with the transmission shaft 5 to realize the continuous transmission demand of the material. This transmission mode only acts on one side of the flexible material with friction, and the other side has no direct or indirect contact such as compression, adsorption or friction, so as to better ensure that the surface of the material is not damaged, so as to ensure coating, liquid evaporation and multi-condition transmission requiring non-contact

[0033] An adsorption width adjustment mechanism 6 is provided in the guide fan-shaped mouth 8, and the adsorption width adjustment mechanism 6 includes a retractable flexible folded cloth 601 and a retractable mechanism. The retractable flexible folded cloth 601 is provided with two pieces, which are respectively arranged on the left and right sides of the guide fan-shaped mouth 8. The left end face of the left retractable flexible folded cloth 601 is fixedly connected to the left sealing plate 103, and the right end face of the right retractable flexible folded cloth 601 is fixedly connected to the right sealing plate 104, which is used to block the first suction holes 1023 on the left and right sides of the bottom of the fan-shaped groove 1022. The retractable mechanism can drive the left and right pieces of retractable flexible folded cloth 601 to retract linearly in a synchronous manner towards or away from each other, so as to adjust the effective adsorption width of the guide fan-shaped mouth 8.

[0034] By setting up the adsorption width adjustment mechanism 6, the effective adsorption width of the guide fan-shaped mouth 8 can be adjusted quickly and conveniently, thereby solving the problems of unstable vacuum, asynchronous transmission and tension fluctuation caused by the inconsistency between the effective adsorption width of the existing vacuum adsorption wheel and the material width. Any width smaller than the mechanical width of the vacuum adsorption wheel can become the effective adsorption width to adapt to the width requirements of different materials, saving the cost of the existing technology that requires multiple vacuum suction wheels for different material widths.

[0035] Preferably, the inner wall of the inner cavity 1021 of the vacuum cavity tube 102 is composed of an arc wall and a plane wall, and the fan-shaped groove 1022 is arranged on the outer surface of the plane wall.

[0036] The telescopic mechanism adopts a bidirectional screw linear movement mechanism, including a screw 602, a screw nut 603 and a mounting plate 604. The right side of the left telescopic flexible folding cloth 601 and the left side of the right telescopic flexible folding cloth 601 are both provided with a connecting plate 6011. The mounting plate 604 is configured to be fan-shaped to match the shape of the guide fan-shaped opening 8. It is provided with two pieces, which are respectively fixedly connected to the left connecting plate 6011 and the right connecting plate 6011. The screw nut 603 is provided with two pieces, which are respectively fixedly connected to the right side of the left mounting plate 604 and the left side of the right mounting plate 604. The screw 602 is provided in the middle of the guide fan-shaped opening 8, and its axis is parallel to the axis of the vacuum chamber tube 102. The two ends of the screw rod 602 are respectively connected with the external threads on the left and right ends of the screw rod 602, and the two ends of the screw rod 602 are respectively connected with the left sealing plate 103 and the right sealing plate 104 to form a rotatable but non-linear movement left and right connection, and the left end passes through the left sealing plate 103 and the left end cover 2, and a hexagonal recessed groove is provided on the left end surface. The left end of the screw rod 602 is set as a screw rotating end 608, which is convenient for rotating the screw rod with a hexagonal wrench. Rotating the screw rod 602 can drive the two screw nuts 603 to move in a straight line toward or away from each other, thereby driving the two retractable flexible folding cloths 601 to synchronously retract in a straight line toward or away from each other, so that the suction width of the guide fan-shaped opening 8 is reduced or expanded.

[0037] The present invention adopts a bidirectional screw rod linear moving mechanism, which has high adjustment accuracy and simple structure. The rotation adjustment end of the screw rod 602 is arranged at the fixed end of the left end cover 2, which is easy to operate.

[0038] like Fig. 9 As shown: Specific working process: When the material width is smaller than the original vacuum adsorption width AB, use the hexagonal wrench to rotate the screw rotating end 608 to drive the screw 602 to rotate, so that the two screw nuts 603 move toward each other at the same time, and the mounting plate 604 and the connecting plate 6011 connected to the screw nuts 603 move toward each other together, so that the retractable flexible folding cloth 601 on both sides shrinks to the middle to achieve the effective adsorption width A1B1 position required by the material.

[0039] On the contrary, when the width needs to be adjusted from A1B1 to AB, it is only necessary to rotate the screw rotating end 608 in the opposite direction to increase the effective vacuum adsorption width of the adsorption transmission wheel.

[0040] Preferably, two annular grooves are provided on the outer circular surface of the left end of the screw rod 602, and a retaining spring 607 is provided in each of the two annular grooves. The right side of one retaining spring 607 is connected to the left side of the left sealing plate 103, and the left side of the other retaining spring 607 is connected to the right side of the left sealing plate 103, so that the screw rod 602 and the left sealing plate 103 form a rotatable but non-linearly movable connection. A blind hole is provided on the right sealing plate 104 at a position corresponding to the screw rod 602, and the right end of the screw rod 602 is inserted into the blind hole.

[0041] Preferably, the adsorption width adjustment mechanism 6 also includes a guide slide bar 606, and the upper and lower outer sides of the mounting plate 604 are respectively provided with side wings 6041 extending upward and downward, and the middle of the fan-shaped blocking column 7 and the corresponding positions of the two side wings 6041 are provided with matching rectangular slide grooves 701, and the right side surface of the side wing 6041 of the left mounting plate and the left side surface of the side wing 6041 of the right mounting plate are fixedly connected with a slide bar 605, and guide holes are provided on the slide bar 605 and the side wing 6041, and the guide slide bar 606 is provided with two pieces, and the axes of the two guide slide bars 606 are arranged parallel to the axis of the screw rod 602, and pass through the corresponding left and right guide holes respectively, and the two ends are respectively fixedly connected to the left sealing plate 103 and the right sealing plate 104.

[0042] By providing the guide slide bar 606, the retractable flexible folding cloth 601 on the left and right sides can be retracted more smoothly without deviation in the retracting direction, thereby improving the practicability of the present invention.

[0043] Preferably, the inner side of the retractable flexible folding cloth 601 is connected with a plurality of rings 6013 through a support rod 6012. The rings 6013 are coaxial with the screw rod 602, have an outer diameter greater than that of the screw rod 602, and are sleeved on the outer side of the screw rod 602, and can move straightly left and right along the screw rod 602. The rings 6013 can prevent the retractable flexible folding cloth 601 from falling out of the guide fan-shaped opening 8 when retracting, thereby losing the function of adjusting the effective adsorption width.

[0044] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A variable adsorption width vacuum transmission mechanism, characterized in that: It comprises a vacuum adsorption mechanism and a transmission mechanism, the vacuum adsorption mechanism comprises a vacuum pipeline and a diversion fan-shaped opening, the transmission mechanism comprises a transmission shaft, a transmission perforated wheel surface and a metal outer net, the vacuum pipeline comprises a vacuum tube and a vacuum cavity tube, the left end of the vacuum cavity tube is provided with a left sealing plate, and the right end is provided with a right sealing plate, the left side surface of the left sealing plate and the right side surface of the right sealing plate are both provided with a cylindrical portion extending outward, the cylindrical portions are both sleeved with rolling bearings, the right end of the vacuum tube is inserted into the left sealing plate, the interior is communicated with the inner cavity of the vacuum cavity tube, and the left end is connected to a vacuum pumping device, a fan-shaped groove penetrating both ends is opened on one side wall of the vacuum cavity tube along the axial direction, a plurality of uniformly distributed first air suction holes are opened on the bottom of the fan-shaped groove, two fan-shaped blocking columns are fixedly connected to the two sides of the fan-shaped groove, and a diversion fan-shaped opening is formed between the fan-shaped groove and the two fan-shaped blocking columns; The transmission perforated wheel surface is a cylindrical sleeve with a closed right end, which is sleeved on the outside of the vacuum cavity tube. The two ends of the inner hole of the transmission perforated wheel surface are respectively fastened to the outer rings of rolling bearings at both ends, so that the transmission perforated wheel surface and the vacuum pipe are rotatably connected. The metal outer net is sleeved on the outer side of the transmission perforated wheel surface. The transmission perforated wheel surface is provided with a plurality of second air suction holes evenly distributed in a circular array. The two ends of the transmission perforated wheel surface are respectively provided with a left end cover and a right end cover. The right end surface of the transmission perforated wheel surface is fixedly connected to the right end cover, and the left end cover is fixedly connected to the cylindrical part of the left sealing plate. The left end of the transmission shaft is fixedly connected to the right end cover, and the other end is connected to the motor. The rotation of the transmission shaft can drive the transmission perforated wheel surface and the metal outer net to rotate synchronously together; An adsorption width adjustment mechanism is provided in the guide fan-shaped opening, and the adsorption width adjustment mechanism includes a retractable flexible folding cloth and a retractable mechanism. The retractable flexible folding cloth is provided with two pieces, which are respectively arranged on the left and right sides of the guide fan-shaped opening. The left end surface of the left retractable flexible folding cloth is fixedly connected to the left sealing plate, and the right end surface of the right retractable flexible folding cloth is fixedly connected to the right sealing plate, which is used to cover the first air suction holes on the left and right sides of the fan-shaped groove bottom. The retractable mechanism can drive the left and right retractable flexible folding cloths to retract synchronously and linearly toward or away from each other, so as to adjust the effective adsorption width of the guide fan-shaped opening; The telescopic mechanism adopts a bidirectional screw linear movement mechanism, including a screw, a screw nut and a mounting plate. The right side of the left telescopic flexible folding cloth and the left side of the right telescopic flexible folding cloth are both provided with connecting plates. The mounting plate is configured to be fan-shaped to match the shape of the guide fan-shaped opening, and is provided with two pieces, which are respectively fixedly connected to the left connecting plate and the right connecting plate. The screw nut is provided with two pieces, which are respectively fixedly connected to the right side of the left mounting plate and the left side of the right mounting plate. The screw is arranged in the middle of the guide fan-shaped opening, and its axis is aligned with the axis of the vacuum chamber tube. The two ends of the screw rod are respectively connected with the external threads on the left end and the right end of the screw rod, and the two ends of the screw rod are respectively connected with the left sealing plate and the right sealing plate to form a rotatable but non-linear movement connection to the left and right. The left end passes through the left sealing plate and the left end cover, and an inner hexagonal groove is provided on the left end surface for convenient rotation of the screw rod with an inner hexagonal wrench. Rotating the screw rod can drive the two screw rod nuts to move in a straight line toward or away from each other, thereby driving the two retractable flexible folding cloths to synchronously retract in a straight line toward or away from each other, so that the suction width of the guide fan-shaped opening is reduced or expanded.

2. A variable adsorption width vacuum transmission mechanism according to claim 1, characterized in that: The inner wall of the inner cavity of the vacuum cavity tube is composed of an arc wall and a plane wall, and the fan-shaped groove is arranged on the outer surface of the plane wall.

3. The variable adsorption width vacuum transmission mechanism according to claim 1, characterized in that: Two annular grooves are provided on the outer circular surface of the left end of the screw rod, and a retaining spring is provided in each of the two annular grooves. The right side of one retaining spring is connected to the left side of the left sealing plate, and the left side of the other retaining spring is connected to the right side of the left sealing plate, so that the screw rod and the left sealing plate form a rotatable but non-linearly movable connection. A blind hole is provided on the right sealing plate at a position corresponding to the screw rod, and the right end of the screw rod is inserted into the blind hole.

4. The variable adsorption width vacuum transmission mechanism according to claim 1, characterized in that: The adsorption width adjustment mechanism also includes a guide slide bar, and the upper and lower outer sides of the mounting plate are respectively provided with side wings extending upward and downward, and the middle of the fan-shaped blocking column and the corresponding positions of the two side wings are provided with matching rectangular slide grooves, and the right side surface of the side wing of the left mounting plate and the left side surface of the side wing of the right mounting plate are fixedly connected with a slide bar, and guide holes are provided on the slide bar and the side wings. The guide slide bar is provided with two pieces, and the axes of the two guide slide bars are arranged parallel to the axis of the screw rod, and pass through the left and right corresponding guide holes respectively, and the two ends are respectively fixedly connected to the left sealing plate and the right sealing plate.

5. The variable adsorption width vacuum transmission mechanism according to claim 1, characterized in that: The inner side of the retractable flexible folding cloth is connected with a plurality of circular rings through a supporting rod. The circular rings are coaxial with the screw rod, have an outer diameter greater than that of the screw rod, and are sleeved on the outer side of the screw rod.

6. The variable adsorption width vacuum transmission mechanism according to claim 1, characterized in that: A flange is provided at the left end of the transmission shaft, and the flange is fixedly connected to the right end cover.

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