Adsorption conveyor belt for photovoltaic wafer

Abstract

The present invention provides an adsorption conveyor belt for photovoltaic wafers, comprising a long strip suction table, a belt and a driving mechanism, wherein the suction table has an adsorption surface, the adsorption surface is provided with a workpiece suction groove, and the belt runs along the adsorption surface under the drive of the driving mechanism, and is characterized in that an air cavity and a jet flow channel are formed in the suction table, the air cavity is connected to a positive pressure gas source, the inlet end of the jet flow channel is connected to the air cavity, the outlet end is connected to the outside, and the workpiece suction groove is connected to the jet flow channel. The positive and progressive effect of the present invention is that no additional special vacuum device is required, and negative pressure adsorption force is generated by positive pressure gas, thereby realizing an adsorption and transmission device with simple design, low cost, fast response speed, and simple control.

Description

Technical Field

[0001] The invention relates to the fields of photovoltaics, electronics and semiconductors, and in particular to an adsorption conveyor belt for photovoltaic wafers. Background Art

[0002] Adsorption conveyor belts are widely used in the production and manufacturing of thin-film workpieces in the photovoltaic industry, electronics industry, 3C digital industry, printing or packaging industry, logistics sorting and other industries.

[0003] Existing adsorption conveyor belts all have a certain number of small holes on the belt, and also have a number of air holes or air grooves inside the belt pallet or support plate. A vacuum pump is used to provide negative pressure gas so that the thin workpiece material is adsorbed on the belt through the negative pressure suction in the air holes on the belt. As the belt runs, the purpose of adsorption and transmission is achieved.

[0004] This adsorption conveyor belt has the following defects:

[0005] There must be a negative pressure gas source in the user's workshop. When installing the automation equipment, the equipment must be arranged with two gas lines, one for the compressed gas required by the cylinder / solenoid valve of the equipment itself, that is, positive pressure gas, and the other for the negative pressure gas used for the adsorption transmission device.

[0006] If the user's workshop does not have a negative pressure gas source, or the negative pressure gas source is unstable, the automation equipment must be equipped with a vacuum pump inside the equipment itself.

[0007] Whether it is a vacuum pump or a centralized negative pressure gas source, both are devices with high purchase and maintenance costs.

[0008] Moreover, the negative pressure transmission system of this design has the disadvantages of complex design, low transmission efficiency, slow response speed, etc. Summary of the invention

[0009] The technical problem to be solved by the present invention is to provide an adsorption conveyor belt for photovoltaic chips, which has the advantages of simple design, low cost, fast reaction speed and simple control.

[0010] The present invention solves the technical problem in the following ways:

[0011] A photovoltaic wafer adsorption conveyor belt comprises a long strip suction table, a belt and a driving mechanism, wherein the suction table has an adsorption surface, the adsorption surface is provided with a workpiece suction groove, and the belt runs along the adsorption surface under the drive of the driving mechanism, and is characterized in that an air cavity and a jet flow channel are formed in the suction table, the air cavity is connected to a positive pressure air source, the inlet end of the jet flow channel is connected to the air cavity, and the outlet end is connected to the outside, and the workpiece suction groove is connected to the jet flow channel.

[0012] As a preferred embodiment of the present invention, the suction table is composed of a substrate and a negative pressure generating plate, a first concave cavity is provided on the splicing surface of the substrate, a second concave cavity is provided on the splicing surface of the negative pressure generating plate, the first concave cavity and the second concave cavity are combined to form the air cavity, the jet flow channel is provided in the negative pressure generating plate, and the surface of the negative pressure generating plate away from the splicing surface is the adsorption surface.

[0013] As a preferred embodiment of the present invention: the negative pressure generating plate protrudes from the substrate, and the outlet end of the jet flow channel is located on the side wall of the negative pressure generating plate protruding from the substrate.

[0014] As a preferred embodiment of the present invention, a plurality of the jet channels are horizontally spaced apart on both sides of the second concave cavity of the negative pressure generating plate, and two workpiece suction grooves are provided on the adsorption surface and respectively connect the jet channels on both sides.

[0015] As a preferred embodiment of the present invention, the jet flow channel includes a front section from the inlet end to the workpiece suction groove and a rear section from the workpiece suction groove to the outlet end, and the diameter of the front section is smaller than the diameter of the rear section.

[0016] As a preferred embodiment of the present invention, the bottom surface of the substrate facing the negative pressure generating plate is provided with convex edges on both sides, the convex edges are flush with the adsorption surface, and the side of the convex edge facing the outlet end of the jet channel is an arc-shaped guide surface.

[0017] As a preferred embodiment of the present invention, a plurality of the negative pressure generating plates are connected end to end and assembled with the substrate, and a plurality of air cavities isolated from each other are formed at the assembled surface between each of the negative pressure generating plates and the substrate.

[0018] As a preferred embodiment of the present invention, the suction table is provided with a loading and unloading station at each of the negative pressure generating plates, and the loading and unloading station includes a sensor, an air pipe joint and a first solenoid valve, the sensor is provided on the adsorption surface of the negative pressure generating plate, the air pipe joint is connected to the air cavity of each negative pressure generating plate, the sensor is connected to the first solenoid valve, and the air pipe joint is connected to the positive pressure air source via the first solenoid valve.

[0019] As a preferred embodiment of the present invention, the driving mechanism includes a fixed table arranged on the suction table, a motor and a driving wheel group arranged on the fixed table, and a driven shaft arranged at both ends of the suction table, the driving wheel group includes at least two driving wheels transmission-connected to the motor, and the belt is wound around the driving wheel and the driven shaft.

[0020] As a preferred embodiment of the present invention, an elastic rod is provided on the fixing platform, and a pressure wheel is provided at the end of the elastic rod. The pressure wheel continuously and uninterruptedly presses against the belt under the action of the elastic rod.

[0021] The positive and progressive effects of the present invention are: no additional special vacuum device is required, negative pressure adsorption force is generated by positive pressure gas to achieve adsorption transmission, simple design, low cost, fast response speed, and simple control; multiple driving wheels are used to transmit the belt, which increases the contact area with the belt and the friction between the belt, ensuring stable transmission; the belt is continuously and uninterruptedly supported by the tensioning wheel, so that the belt is always kept taut, reducing the frequency of maintenance and debugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings:

[0023] Figure 1 is a stereogram of Example 1;

[0024] Figure 2 It is an exploded view of Example 1;

[0025] Figure 3 is a three-dimensional diagram of the negative pressure generating plate in Example 1;

[0026] Figure 4 is a cross-sectional view of the belt suction groove of Example 1;

[0027] Figure 5 is a cross-sectional view of the workpiece suction groove of Example 1;

[0028] Figure 6 is a cross-sectional view of Example 2;

[0029] Wherein: 100- suction table, 110- base plate, 111- first concave cavity, 112- air pipe joint, 113- three-way joint, 114- convex edge, 115- flow guide surface, 120- negative pressure generating plate, 121- adsorption surface, 123- workpiece suction groove, 124- belt suction groove, 125- second concave cavity, 126- third concave cavity, 130- air cavity, 131- first air cavity, 132- second air cavity, 140- jet flow channel, 141-first jet channel, 142-second jet channel, 143-front section, 144-rear section, 150-sensor, 160-first solenoid valve, 170-blowing hole, 171-air valve, 180-second solenoid valve, 210-driving mechanism, 211-fixed platform, 212-motor, 213-driving wheel set, 220-driven shaft, 230-elastic rod, 231-pressure wheel, 240-belt, 300-slot. DETAILED DESCRIPTION

[0030] The present invention is further described below by means of specific embodiments:

[0031] Example 1

[0032] like Figure 1 As shown, a photovoltaic wafer adsorption conveyor belt includes an adsorption platform 100, a belt 240 and a driving mechanism 210.

[0033] The suction table 100 is in a long strip shape, and the bottom surface of the suction table 100 is a suction surface 121, and a plurality of workpiece suction grooves 123 arranged along the length direction of the suction table 100 are provided on the suction surface 121. The driving mechanism 210 is provided on the suction table 100, and the belt 240 runs along the suction surface under the drive of the driving mechanism 210 and avoids the workpiece suction grooves 123.

[0034] Combination Figure 1 , Figure 3 and Figure 5 A closed air cavity 130 and a jet channel 140 are formed in the suction table 100 . The air cavity 130 is connected to a positive pressure air source. The inlet end of the jet channel 140 is connected to the air cavity 130 , and the outlet end is connected to the outside. The workpiece suction groove 123 is connected to the jet channel 140 .

[0035] When in use, the positive-pressure gas in the air cavity 130 is ejected to the outside at high speed through the jet channel 140, forming a negative pressure zone (derived from Bernoulli's fluid theorem) at the workpiece suction groove 123 connected to the jet channel 140. The photovoltaic chip is adsorbed by the negative pressure in the negative pressure zone and adheres to the belt, and moves with the operation of the belt, thereby achieving the effect of adsorption and transmission.

[0036] The advantage of adopting this structure is that only an air compressor or a compressed air bottle is needed, and no vacuum pump or vacuum solenoid valve is required to adsorb the photovoltaic chip. The design is simple and the manufacturing cost is low.

[0037] Furthermore, the adsorption force control is achieved by controlling the positive pressure gas input, and the control effect can be achieved through a solenoid valve, which has the advantage of simple control.

[0038] Furthermore, the negative pressure generated by the device directly acts on the photovoltaic chip without the need for an external air pipe connection, and has the advantages of strong adsorption force and fast response speed.

[0039] Combination Figure 1 , Figure 3 and Figure 4A belt suction groove 124 is provided at the position where the adsorption surface 121 is in contact with the belt 240, and the belt suction groove 124 is also connected with the jet flow channel 140 to perform negative pressure adsorption on the belt 240. In this way, when the adsorption conveyor belt is installed upside down for use, the belt suction groove 124 can absorb the belt 240 to prevent the belt 240 from sagging, so that the photovoltaic wafers transported on the belt 240 can always be close to the workpiece suction groove 123, and can obtain stable negative pressure suction without falling from the belt 240.

[0040] like Figure 3 As shown, the air cavity 130 is divided into a first air cavity 131 and a second air cavity 132 which are independent of each other, and the jet flow channel 140 is divided into a first jet flow channel 141 which connects the first air cavity 131 and the outside world, and a second jet flow channel 142 which connects the second air cavity 132 and the outside world. The workpiece suction groove 123 is connected to the first jet flow channel 141, and the belt suction groove 124 is connected to the second jet flow channel 142.

[0041] Since the workpiece suction groove 123 has a much greater requirement for negative pressure suction than the belt suction groove 124, this structure can be used to control the negative pressure suction of the workpiece suction groove 123 and the belt suction groove 124 respectively, and the running resistance of the belt 240 can be reduced by moderately reducing the negative pressure suction of the belt suction groove 124, and the belt suction groove 124 can maintain a stable suction force without being affected by the suction fluctuation of the workpiece suction groove 123.

[0042] Combination Figure 2 , Figure 3 and Figure 4 The suction table 100 is composed of a substrate 110 and a negative pressure generating plate 120. A first cavity 111 is provided on the surface of the substrate 110. A second cavity 125 and a third cavity 126 independent of the second cavity 125 are provided on the surface of the negative pressure generating plate 120. The third cavity 126 is provided on both sides of the second cavity 125. The first cavity 111 and the second cavity 125 are combined to form a first air cavity 131. The first cavity 111 and the third cavity 126 are combined to form a second air cavity 132.

[0043] The first jet channel 141 and the second jet channel 142 are horizontally spaced apart and arranged in the negative pressure generating plate 120. The inlet end of the first jet channel 141 is located on the inner wall of the second concave cavity 125, and the outlet end is located on the outer wall of the negative pressure generating plate 120. The inlet end of the second jet channel 142 is located on the inner wall of the third concave cavity 126, and the outlet end is located on the outer wall of the negative pressure generating plate 120.

[0044] The negative pressure generating plate 120 protrudes from the substrate 110 , and the outlet ends of the first jet channel 141 and the second jet channel 142 are evenly spaced along the length direction of the suction table 100 on the outer walls of both sides of the negative pressure generating plate 120 protruding from the substrate 110 .

[0045] Combination Figure 1 and Figure 2 The surface of the negative pressure generating plate 120 that is opposite to the joint surface is the suction surface 121, the belt suction grooves 124 are arranged on both sides of the suction surface 121 along the length direction of the suction table 100, and two parallel belts 240 are arranged in contact with the belt suction grooves 124. The workpiece suction groove 123 is arranged between the two belts 240 along the length direction of the suction table 100.

[0046] Of course, it is also feasible to provide more than two belts 240 and to provide a plurality of workpiece suction grooves 123 between the belts 240 or on the outside of the belts 240 .

[0047] like Figure 4 and Figure 5 As shown, the first jet channel 141 includes a front section 143 from the inlet end to the workpiece suction groove 123 and a rear section 144 from the workpiece suction groove 123 to the outlet end. The second jet channel 142 also includes a front section 143 from the inlet end to the belt suction groove 124 and a rear section 144 from the belt suction groove 124 to the outlet end. The diameter of the front section 143 is smaller than the diameter of the rear section 144. The smaller diameter of the front section 143 can increase the ejection velocity of the airflow, reduce the pressure, and increase the negative pressure suction. The larger diameter of the rear section 144 can reduce the flow velocity of the airflow, which plays a role in reducing air resistance and operating noise.

[0048] The substrate 110 is provided with convex edges 114 on both sides of the bottom surface facing the negative pressure generating plate 120. The convex edges 114 are flush with the adsorption surface 121 of the negative pressure generating plate 120. The side of the convex edge 114 facing the outlet end of the first jet channel 141 and the second jet channel 142 is an arc-shaped guide surface 115. The airflow ejected from the outlet forms a vortex under the guidance of the guide surface 115. The vortex can exert an additional lifting force on the photovoltaic chip, thereby improving the adsorption reliability of the adsorption conveyor belt during inverted installation and operation.

[0049] Combination Figures 1 to 3 There are a plurality of negative pressure generating plates 120, which are connected end to end and assembled with the substrate 110. The first air cavity 131 and the second air cavity 132 are formed at the assembled surface of each substrate 110 and the negative pressure generating plate 120, and are isolated from each other.

[0050] The side wall of the base plate 110 is provided with a plurality of three-way joints 113 connected to the second air cavity 125. The plurality of three-way joints 113 are connected end to end and connected to the positive pressure air source. The top surface of the base plate 110 is provided with a plurality of air pipe joints 112 connected to the first air cavity 131 respectively. The air pipe joints 112 are connected to the positive pressure air source. In this way, the first air cavity 131 and the second air cavity 132 are independently controlled.

[0051] The suction table 100 is provided with a loading and unloading station at the position corresponding to each negative pressure generating plate 120, and the loading and unloading station includes a sensor 150 provided on the adsorption surface 121 of the negative pressure generating plate 120, a first solenoid valve 160 provided on the substrate 110, and the air pipe joint 112. The sensor 150 is connected to the first solenoid valve 160, and the air pipe joint 112 is connected to the positive pressure air source via the first solenoid valve 160. The loading and unloading station also includes a blowing hole 170 provided next to the sensor 150, a second solenoid valve 180 provided on the substrate 110, and an air valve 171 connected to the blowing hole 170. The sensor 150 is also connected to the second solenoid valve 180, and the air valve 171 is connected to the positive pressure air source via the second solenoid valve 180.

[0052] The loading and unloading station is used for unloading photovoltaic wafers when the adsorption conveyor belt is installed upside down. When the sensor detects that the photovoltaic wafer passes by, the first solenoid valve 160 is controlled to disconnect the connection between the air pipe joint 112 and the first air cavity 131, so that the negative pressure generating plate 120 loses the negative pressure suction, and the second solenoid valve 180 is controlled to connect the air valve 171 with the positive pressure air source, and the blowing hole 170 blows air to the photovoltaic wafer, so that it can easily break away from adsorption and fall into the material box below, so as to achieve accurate and reliable unloading action.

[0053] Combination Figure 1 and Figure 2 The driving mechanism 210 includes a fixed platform 211 arranged on the suction platform 100, a motor 212 and a driving wheel group 213 arranged on the fixed platform 211, and a driven shaft 220 arranged at both ends of the suction platform 100. The driving wheel group 213 includes at least two driving wheels connected to the motor 212 in a transmission manner. The belt 240 is wound around the driving wheel and the driven shaft 220 to realize the transmission of the belt 240. The outer circumferential surface of the driving wheel 213 and the outer circumferential surface of the driven shaft 220 are both provided with knurling to increase the friction between the belt and the belt. The purpose of setting multiple driving wheels is to increase the contact length between the belt 240 and the driving wheel, thereby increasing the friction between the driving wheel and the belt 240. As a result, the belt 240 is not easy to slip with the driving mechanism, and has higher transmission stability.

[0054] The fixing platform 211 is also provided with an elastic rod 230 , at the end of which a pressure wheel 231 is provided. Under the action of the elastic rod 230 , the pressure wheel 231 continuously and uninterruptedly presses against the belt 240 , thereby self-tensioning the belt 240 and reducing the maintenance frequency.

[0055] Example 2

[0056] like Figure 6As shown, the main difference between Example 2 and Example 1 is that the belt suction groove 124 is replaced by a card slot 300 set on the suction surface 121, and the belt 240 is embedded in the card slot 300 and runs along the card slot 300. The belt 240 has a bearing surface protruding from the suction surface 121. The photovoltaic wafer is placed on the bearing surface for transportation, and this structure can also prevent the belt from sagging. However, compared with setting the belt suction groove, this structure will greatly increase the running resistance of the belt, increase the running load and power consumption of the equipment, so it is preferred to adopt the solution of setting the belt suction groove.

[0057] However, those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A photovoltaic wafer adsorption conveyor belt, comprising a long strip-shaped adsorption platform (100), a belt (240) and a driving mechanism (210), wherein the adsorption platform (100) has an adsorption surface (121), and a workpiece adsorption groove (123) is provided on the adsorption surface (121), and the belt (240) runs along the adsorption surface (121) under the drive of the driving mechanism (210), and an air cavity (130) and an injection flow channel (140) are formed in the adsorption platform (100), and the air cavity (130) is connected to a positive pressure air source, and the inlet end of the injection flow channel (140) is connected to the air cavity (130), and the outlet end is connected to the outside, and the workpiece adsorption groove (123) is connected to the injection flow channel (140), characterized in that: The belt avoids the workpiece suction groove, and the suction table (100) is composed of a base plate (110) and a negative pressure generating plate (120) spliced ​​together. A first concave cavity (111) is provided on the spliced ​​surface of the base plate (110), and a second concave cavity (125) is provided on the spliced ​​surface of the negative pressure generating plate (120). The first concave cavity (111) and the second concave cavity (125) are combined to form the air cavity (130). The injection flow channel (140) is provided in the negative pressure generating plate (120), and the surface of the negative pressure generating plate (120) away from the spliced ​​surface is the suction surface (121).

2. The adsorption conveyor belt for photovoltaic wafers according to claim 1, characterized in that: The negative pressure generating plate (120) protrudes outside the substrate (110), and the outlet end of the jet flow channel (140) is located on the side wall of the negative pressure generating plate (120) protruding outside the substrate (110).

3. The adsorption conveyor belt for photovoltaic wafers according to claim 1, characterized in that: The plurality of jet channels (140) are horizontally spaced apart on both sides of the second concave cavity (125) of the negative pressure generating plate (120), and the plurality of workpiece suction grooves (123) are provided on the suction surface (121) and are respectively connected to the jet channels (140) on both sides.

4. The adsorption conveyor belt for photovoltaic wafers according to claim 3, characterized in that: The jet flow channel (140) comprises a front section (143) from an inlet end to a workpiece suction groove (123) and a rear section (144) from the workpiece suction groove (123) to an outlet end, and the diameter of the front section (143) is smaller than the diameter of the rear section (144).

5. The adsorption conveyor belt for photovoltaic wafers according to claim 2, characterized in that: The base plate (110) is provided with convex edges (114) on both sides of the bottom surface facing the negative pressure generating plate (120), and the side of the convex edge (114) facing the outlet end of the injection flow channel (140) is an arc-shaped guide surface (115).

6. The adsorption conveyor belt for photovoltaic wafers according to claim 1, characterized in that: A plurality of the negative pressure generating plates (120) are connected end to end and spliced ​​with the substrate (110), and a plurality of the air cavities (130) are formed at the splicing surface between each of the negative pressure generating plates (120) and the substrate (110).

7. The adsorption conveyor belt for photovoltaic wafers according to claim 6, characterized in that: The suction table (100) is provided with a loading and unloading station at each of the negative pressure generating plates (120), and the loading and unloading station comprises a sensor (150), an air pipe joint (112) and a first solenoid valve (160). The sensor (150) is provided on the adsorption surface (121) of the negative pressure generating plate (120), the air pipe joint (112) is connected to the air cavity (130) of each negative pressure generating plate (120), the sensor (150) is connected to the first solenoid valve (160), and the air pipe joint (112) is connected to a positive pressure air source via the first solenoid valve (160).

8. The adsorption conveyor belt for photovoltaic wafers according to claim 1, characterized in that: The driving mechanism (210) comprises a fixed platform (211) arranged on the suction platform (100), a motor (212) and a driving wheel group (213) arranged on the fixed platform (211), and a driven shaft (220) arranged at two ends of the suction platform (100); the driving wheel group (213) comprises at least two driving wheels drivingly connected to the motor (212); and the belt (240) is wound around the driving wheel and the driven shaft (220).

9. The adsorption conveyor belt for photovoltaic wafers according to claim 8, characterized in that: An elastic rod (230) is provided on the fixed platform (211), and a pressure wheel (231) is provided at the end of the elastic rod (230). The pressure wheel (231) continuously and uninterruptedly presses against the belt (240) under the action of the elastic rod (230).

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