Double-top workbench and alignment method

Abstract

The present invention proposes a double-table workbench and an alignment method, wherein the double-table workbench includes a conveying mechanism, a first workbench, a second workbench and an alignment component; the conveying mechanism includes a first slide rail and a second slide rail; the first slide rail is provided with a first slider; the second slide rail is provided with a second slider; the two ends of the conveying mechanism are an alignment station and a working station respectively; the first workbench is connected to the first slider, and the second workbench is connected to the second slider; the first workbench and the second workbench can slide back and forth at the alignment station and the working station along the first slide rail and the second slide rail respectively; the alignment component is arranged at the alignment station; the alignment component includes a UVW alignment table and a connecting component for connecting the UVW alignment table to the first workbench or the second workbench. The present invention solves the problem of low alignment accuracy of conventional double-table workbenches.

Description

Technical Field

[0001] The invention relates to the technical field of workbenches, and in particular to a double-top workbench and an alignment method. Background Art

[0002] The UVW alignment platform is a multi-axis joint motion mechanism. Through the parallel motion of four linear moving axes, it can realize complex motions such as single-axis linear motion, two-axis linear interpolation, two-axis circular interpolation, and arbitrary center rotation. It is the mechanical execution part of the high-precision visual alignment system. Its high-precision characteristics make it widely used in screen printing machines, exposure machines, mask printing machines, and placement machines. At present, the UVW platform consists of a lower base plate, an upper table, and four motion axes. The four motion axes cooperate with each other to achieve precise alignment. A single UVW platform can align a single workbench multiple times with high position accuracy, but the time required for alignment is relatively long and the production efficiency is low; the upper and lower workbenches of the double-treadmill work platform work in parallel with high efficiency, but the position accuracy of the object on the workbench depends on the position accuracy when loading, the position accuracy is poor, and it is not easy to adjust. Therefore, the existing technology still needs further improvement. Summary of the invention

[0003] The main purpose of the present invention is to provide a double-top workbench and an alignment method for the double-top workbench, aiming to solve the problem of low alignment accuracy of the double-top workbench in the prior art.

[0004] To achieve the above-mentioned purpose, the double-top workbench proposed in the present invention includes a conveying mechanism, a first workbench, a second workbench and an alignment component; the conveying mechanism includes a first slide rail and a second slide rail; a first slider is provided on the first slide rail; a second slider is provided on the second slide rail; the two ends of the conveying mechanism are respectively an alignment station and a working station; the first workbench is connected to the first slider, and the second workbench is connected to the second slider; the first workbench and the second workbench can slide back and forth at the alignment station and the working station along the first slide rail and the second slide rail respectively; the alignment component is arranged at the alignment station; the alignment component includes a UVW alignment table and a connecting component for connecting the UVW alignment table to the first workbench or the second workbench.

[0005] Preferably, a first locking mechanism is connected to the first sliding block, and the first sliding block can be lockably connected to the first workbench through the first locking mechanism.

[0006] Preferably, the first locking mechanism comprises a first pressing plate cylinder and a first pressing plate.

[0007] Preferably, the first slide rail is located inside the second slide rail, and an upper surface of the first workbench is lower than a lower surface of the second workbench.

[0008] Preferably, a target is arranged on the first workbench, and the alignment component further comprises a reset camera for photographing the target to determine the position of the first workbench.

[0009] Preferably, the target is arranged at an edge of the first workbench.

[0010] Preferably, the UVW alignment platform is located below the alignment station, and the target is arranged on the lower surface of the first workbench.

[0011] Preferably, the alignment component further comprises a light source for illuminating the target.

[0012] Preferably, a plurality of the targets are provided, and the plurality of targets are arranged at intervals.

[0013] Preferably, at least two of the targets are each provided with a corresponding reset camera.

[0014] Preferably, the lower surface of the first workbench is provided with two positioning parts with the center of the first workbench as the symmetrical center; the UVW alignment table is located below the alignment station, and the alignment component also includes two origin positioning cylinders which are symmetrically arranged and cooperate with the two positioning parts.

[0015] Preferably, the origin positioning cylinder comprises a cylinder body and a piston rod, the piston rod is connected with a pushing portion, and the pushing portion is adapted to the positioning portion.

[0016] Preferably, the positioning portion comprises a cam follower, and the pushing portion has a positioning recess matched with the cam follower.

[0017] Preferably, the UVW alignment platform has an alignment plate, the connecting component is arranged above the alignment plate, and the connecting component is fixed relative to the alignment plate in a horizontal direction.

[0018] Preferably, the connecting assembly comprises a liftable connecting rod, and a top end of the connecting rod has a connecting portion.

[0019] Preferably, a plurality of connecting rods are provided.

[0020] Preferably, a connecting seat adapted to the connecting portion is provided on the lower surface of the first workbench.

[0021] Preferably, the connecting portion is non-circular, and the connecting seat has a groove or a hole matched with the connecting portion.

[0022] Preferably, the connecting portion comprises an electromagnet, the connecting seat has a component made of a soft magnetic material or the connecting seat is made of a soft magnetic material.

[0023] Preferably, the connecting assembly further comprises an ejector column, and the first workbench is provided with an ejector pin corresponding to the ejector column.

[0024] Preferably, the connecting assembly further comprises an electromagnetic magnetic attraction structure, and the first workbench is provided with a magnetic attraction member corresponding to the electromagnetic magnetic attraction structure.

[0025] Preferably, the electromagnetic magnetic attraction structure includes a plurality of electromagnet units, and the magnetic attraction member includes a soft magnetic body matched with the plurality of electromagnet units.

[0026] Preferably, the distance from the top of the ejector column to the ejector pin is smaller than the distance from the top of the electromagnetic magnetic attraction structure to the bottom of the magnetic attraction member.

[0027] Preferably, it is characterized in that the double-top workbench further comprises a lifting mechanism, and the lifting mechanism is used to control the connection component to rise so as to connect to the first workbench or to control the connection component to lower so as to detach from the first workbench.

[0028] Preferably, the lifting mechanism is disposed below the UVW alignment platform to drive the UVW alignment platform to rise or fall.

[0029] Preferably, the lifting mechanism comprises a lifting platform, a guide column and a driving mechanism for driving the lifting platform; the lifting platform is arranged above the UVW alignment platform, and the guide column vertically passes through the lifting platform and is vertically connected to the UVW alignment platform.

[0030] Preferably, the driving mechanism comprises a screw rod, a motor and a sleeve, the motor is connected to the screw rod to drive the screw rod to rotate, and the sleeve is sleeved on the screw rod and fixed to the lifting platform.

[0031] Preferably, the conveying mechanism also includes a driving motor, a conveyor belt and a tensioning wheel; the tensioning wheel is arranged on the inner side of the conveyor belt so that the conveyor belt has a first belt surface and a second belt surface, and the first belt surface and the second belt surface move synchronously and in opposite directions; the first slider is connected to the first belt surface of the conveyor belt, and the second slider is connected to the second belt surface of the conveyor belt.

[0032] The present invention also provides a positioning method for a double-table workbench, comprising the following steps:

[0033] Step 1: The first workbench moves to the alignment station, and the first pressing plate cylinder is released;

[0034] Step 2: The lifting mechanism drives the origin positioning cylinder to rise to a first preset height, and the origin positioning cylinder pushes the first workbench to the origin position;

[0035] Step 3: The lifting mechanism drives the UVW alignment table to rise to a second preset height, so that the UVW alignment table is connected to the first workbench for alignment;

[0036] Step 4: The first pressing plate cylinder presses the first workbench;

[0037] Step 5: The lift can drive the UVW alignment table and the origin positioning cylinder to descend, so that the UVW alignment table and the origin positioning cylinder are separated from the first workbench;

[0038] Step 6: The first workbench moves to the working station, and the second workbench moves to the alignment station.

[0039] Preferably, step 2 comprises:

[0040] Step 2.1: The lifting mechanism drives the origin positioning cylinder to rise to a first preset height, so that the origin positioning cylinder rises to the height of the first cam follower located below the first workbench.

[0041] Step 2.2: The origin positioning cylinder pushes the first cam follower to make the first workbench located at the origin position.

[0042] Preferably, after step 6, the following steps are further included:

[0043] Step 7: Release the second pressure plate cylinder;

[0044] Step 8: The lifting mechanism drives the origin positioning cylinder to rise to a first preset height, and the origin positioning cylinder pushes the second workbench to the origin position;

[0045] Step 9: The lifting mechanism drives the UVW alignment table to rise to a second preset height, so that the UVW alignment table is connected to the second workbench for alignment;

[0046] Step 10: The second pressing plate cylinder presses the second workbench;

[0047] Step 11: The lift can drive the UVW alignment table and the origin positioning cylinder to descend, so that the UVW alignment table and the origin positioning cylinder are separated from the second workbench;

[0048] Step 12: The second workbench moves to the working station, and the first workbench moves to the alignment station.

[0049] The technical solution of the present invention combines a conventional double-table workbench with a UVW alignment table, and uses the UVW alignment table to perform high-precision alignment of the workbench through a connecting component, thereby overcoming the problem that the conventional double-table workbench has low alignment accuracy and can only be used in equipment with low position accuracy requirements.

[0050] The present invention also proposes another alignment method for a double-table workbench, comprising the following steps:

[0051] Step 1: The first workbench moves to the alignment station;

[0052] Step 2: resetting the camera to photograph the target on the first workbench to obtain first position information;

[0053] Step 3: Compare the first location information with the first preset location information; when the difference between the first location information and the first preset location information is not greater than a preset value, proceed to step 5; when the difference between the first location information and the first preset location information is greater than a preset value, proceed to step 4;

[0054] Step 4: The UVW alignment platform adjusts the first workbench to a first preset position according to the first position information obtained;

[0055] Step 5: The loading camera photographs the material on the first workbench to obtain second position information;

[0056] Step 6: The UVW alignment platform adjusts the first workbench according to the acquired second position information to adjust the material on the first workbench to the second preset position.

[0057] Preferably, before step 4 or before step 6, the method further comprises:

[0058] Step a: The lifting mechanism drives the UVW alignment platform to rise to a preset height, so that the UVW alignment platform is connected to the first workbench.

[0059] Preferably, after step 4, the method further includes:

[0060] Step b: The lifting mechanism drives the UVW alignment table to descend, so that the UVW alignment table is separated from the first workbench and reset.

[0061] Preferably, after step 6, the following steps are further included:

[0062] Step 7: The elevator drives the UVW alignment table down, so that the UVW alignment table is separated from the first workbench;

[0063] Step 8: The first workbench moves to the working station, and the second workbench moves to the alignment station.

[0064] The alignment method proposed by the present invention adopts two visual alignments. In the first rough alignment, the position of the first workbench 200 is judged. If the deviation of its position is small and within the alignment range of the fine alignment, the fine alignment is directly performed. If the deviation of its position is large, the rough alignment is first performed to make its position within the range of the fine alignment. The method can save unnecessary rough alignment, and rough alignment is only performed when needed, which can save alignment time, simplify the alignment process, and improve alignment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0066] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0067] Figure 2 It is a schematic diagram of the structure of the UVW alignment platform, the lifting assembly and the connecting assembly in one embodiment of the present invention;

[0068] Figure 3 It is a schematic structural diagram of a UVW alignment platform, a lifting assembly and a connecting assembly in another embodiment of the present invention;

[0069] Figure 4 It is a schematic diagram of the side structure of an embodiment of the present invention;

[0070] Figure 5 This is a schematic diagram of the oblique upward view of the first workbench in one embodiment of the present invention;

[0071] Figure 6 This is a schematic diagram of the bottom structure of the first workbench in one embodiment of the present invention;

[0072] Figure 7 Schematic diagram of the bottom structure of the first workbench in another embodiment of the present invention

[0073] Figure 8 This is a schematic diagram of the side structure of the first workbench in one embodiment of the present invention;

[0074] Fig. 9 It is a schematic diagram of the oblique top view of the structure of the first workbench in one embodiment of the present invention;

[0075] Fig.10 This is a schematic diagram of the structure of a lifting assembly in one embodiment of the present invention;

[0076] Fig.11 It is a schematic diagram of the connection relationship between the conveyor belt and the first workbench and the second workbench in one embodiment of the present invention.

[0077] Description of Figure Numbers:

[0078]

[0079]

[0080] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0081] 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.

[0082] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0083] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0084] Please refer to Figures 1 to 11The present invention proposes a double-table workbench, which can be used for equipment that needs to be positionally corrected before performing specific operations, such as a screen printer, a pad printer, a dispensing machine, etc. The double-table workbench proposed by the present invention includes a conveying mechanism 100, a first workbench 200, a second workbench 300 and an alignment component 400; the conveying mechanism 100 includes a first slide rail 110 and a second slide rail 130; the first slide rail 110 is provided with a first slider 111; the second slide rail 130 is provided with a second slider 131; the two ends of the conveying mechanism 100 are respectively an alignment station and a working station The first workbench 200 is connected to the first slider 111, and the second workbench 300 is connected to the second slider 131; the first workbench 200 and the second workbench 300 can slide back and forth along the first slide rail 110 and the second slide rail 130 respectively at the alignment station and the work station; the alignment component 400 is arranged at the alignment station; the alignment component 400 includes a UVW alignment table 410 and a connecting component for connecting the UVW alignment table 410 to the first workbench 200 or the second workbench 300.

[0085] The present invention combines a conventional double-table workbench with a UVW alignment table 410, and uses the UVW alignment table 410 to perform high-precision alignment on the workbench through a connecting component, thereby overcoming the problem that the conventional double-table workbench has low alignment accuracy and can only be used in equipment with low position accuracy requirements.

[0086] The conveying mechanism 100 is used to convey the first workbench 200 and the second workbench 300 to slide back and forth between the alignment station and the working station respectively; the alignment station is a station for realizing position correction of the jig, screen, workpiece, etc. located on the first workbench 200 or the second workbench 300 by adjusting the specific position of the first workbench 200 or the second workbench 300 on the alignment station; after the position correction is completed, the first workbench 200 or the second workbench 300 moves to the working station along the linear slide rail to perform specific operations. At present, the accuracy of the linear slide rail is very high. During the process of the first workbench 200 or the second workbench 300 moving to the working station after the position correction is completed at the alignment station, its position can be precisely controlled. Therefore, after the first workbench 200 or the second workbench 300 moves to the working station along the linear slide rail, its position accuracy can be guaranteed to meet the operation requirements, and there is no need to calibrate its position separately.

[0087] A first slider 111 is provided on the first linear slide rail, and the first workbench 200 can be locked and fixed on the first slider 111; a second slider 131 is provided on the second linear slide rail, and the second workbench 300 can be locked and fixed on the second slider 131; in the present invention, a first locking mechanism 120 is connected to the first slider 111, and a second locking mechanism is connected to the second slider 131; the first locking mechanism 120 includes a first pressure plate 122 and a first pressure plate cylinder 121, and the piston rod of the first pressure plate cylinder 121 passes through the hole on the first workbench 200 and is connected to the first pressure plate 122; the cylinder body of the first pressure plate cylinder 121 is fixedly connected to the first slider 111. In one embodiment, the connection between the first pressure plate cylinder 121 and the first slider 111 is a direct connection. In other embodiments, the first pressure plate cylinder 121 and the first slider 111 can also be indirectly connected through an intermediate connecting part 421.

[0088] The diameter of the piston rod of the first pressure plate cylinder 121 is smaller than the diameter of the corresponding hole on the first workbench 200; when the piston rod of the first pressure plate cylinder 121 contracts, the first pressure plate 122 presses the first workbench 200 to fix the first workbench 200 on the first slider 111; when the piston rod of the first pressure plate cylinder 121 extends, the first pressure plate 122 is separated from the first workbench 200, and the first workbench 200 can rotate and translate within a certain range of the plane to realize the correction of the position of the first workbench 200. The second locking mechanism includes a second pressure plate and a second pressure plate cylinder, the piston rod of the second pressure plate cylinder passes through the hole on the second workbench 300 and is connected to the second pressure plate; the diameter of the piston rod of the second pressure plate cylinder is smaller than the diameter of the corresponding hole on the second workbench 300; when the piston rod of the second pressure plate cylinder contracts, the second pressure plate presses the second workbench 300 to fix the second workbench 300 on the second slider 131; when the piston rod of the second pressure plate cylinder extends, the second pressure plate is separated from the second workbench 300, and the second workbench 300 can rotate and translate within a certain range to realize the correction of the position of the second workbench 300.

[0089] In order to achieve that the first table and the second table do not interfere with each other when they move back and forth between the alignment station and the working station, in the present invention, the first slide rail 110 is located inside the second slide rail 130, and the upper surface of the first workbench 200 is lower than the lower surface of the second workbench 300. That is, the cross-section of the second workbench 300 and the second slide rail 130 is a "door"-shaped structure, and the first workbench 200 is located below the second workbench 300 and inside the second workbench 300. When it reciprocates, it is located as a whole inside the "door"-shaped structure formed by the second workbench 300 and the second slide rail 130.

[0090] In one embodiment, the conveying mechanism 100 further includes a driving motor 530, a conveyor belt 141 and a tensioning wheel 140; the tensioning wheel 140 is arranged inside the conveyor belt 141, so that the conveyor belt 141 has a first belt surface 142 and a second belt surface 143, and the first belt surface 142 and the second belt surface 143 move synchronously and in opposite directions; the first slider 111 is connected to the first belt surface 142 of the conveyor belt 141, and the second slider 131 is connected to the second belt surface 143 of the conveyor belt 141. In this embodiment, the first workbench 200 and the second workbench 300 are driven by the same motor 530, and the arrangement of the tensioning wheel 140 and the conveyor belt 141 enables the first workbench 200 and the second workbench 300 to always move synchronously and in opposite directions.

[0091] In other embodiments, the conveying mechanism 100 may also use separate driving motors 530 to drive the first workbench 200 and the second workbench 300, respectively.

[0092] Although the UVW alignment table 410 has a high alignment accuracy, its alignment stroke, especially the translational alignment stroke, is limited when used on a double-table workbench. The present invention uses a two-time alignment method to achieve high-precision alignment. The first alignment is a rough alignment, in which the first workbench 200 is moved to a preset position, and the second alignment is a fine alignment, in which the precise position of the material is photographed using a loading camera, and then the position is finely adjusted through the UVW alignment table 410.

[0093] In one specific embodiment, an origin positioning cylinder 440 is used to push the first workbench 200 for rough alignment. The lower surface of the first workbench 200 is provided with two positioning parts 450 with the center of the first workbench 200 as the symmetrical center; the UVW alignment table 410 is located below the alignment station, and the alignment assembly 400 also includes two origin positioning cylinders 440 that are symmetrically arranged and matched with the two positioning parts 450. The two origin positioning cylinders 440 push the two positioning parts 450 so that the center of the first workbench 200 is in a fixed horizontal position, and the fixed horizontal position is also the center position of the two origin positioning cylinders 440. The origin positioning cylinder 440 includes a cylinder body and a piston rod, and the piston rod is connected to a pushing part 460, and the pushing part 460 is adapted to the positioning part 450. The positioning part 450 includes a cam follower 451, and the pushing part 460 has a positioning recess 461 matched with the cam follower 451. In other embodiments, the cam follower 451 may also be disposed on the pushing portion 460 , and correspondingly, the two positioning portions 450 have positioning recesses 461 that cooperate therewith.

[0094] In another embodiment, a UVW alignment table 410 is used in combination with a visual imaging system for rough alignment. A target 240 is set on the first workbench 200 , and the alignment component 400 further includes a reset camera 480 for photographing the target 240 to determine the position of the first workbench 200 .

[0095] The UVW alignment platform 410 is located below the alignment station, the target 240 is disposed on the lower surface of the first workbench 200 and at the edge of the first workbench 200 , and the reset camera 480 is disposed on the UVW alignment platform 410 .

[0096] Placing the target 240 on the lower surface of the first workbench 200 facilitates the installation of the reset camera 480, and the reset camera can be arranged on the UVW alignment table 410; placing the target on the edge of the first workbench 200 can improve the accuracy of the acquired position information of the first workbench 200, especially can improve the accuracy of the deflection angle data of the first workbench 200 itself.

[0097] The alignment assembly 400 further includes a light source 490 for illuminating the target so that the reset camera 480 can clearly capture the image of the target 240 .

[0098] The target 240 can be set to one or more. It should be understood that the function of the target 240 is to mark the position of the first workbench 200. In the embodiment where only one target 240 is set to mark the first workbench 200, the shape of the target 240 should be relatively regular so that the position information of the first workbench 200 can be accurately obtained through the image of its shape, including the information of the deflection angle and the position information of the distance and direction from the preset position.

[0099] In other embodiments, the target 240 is provided in plurality, at least two, and three, four or more targets may be provided, and the targets 240 are provided at intervals from each other. In order to accurately obtain the position information of the first workbench 200, at least one reset camera 480 is provided for each of the two targets 240. That is, when two targets 240 are used, a reset camera 480 is provided for each of the two targets 240, and each reset camera 480 only takes an image of one target; when more targets 240 are used, at least two reset cameras 480 are provided to take images of the targets 240. The reset camera 480 may be used to obtain an image of only one target 240, or may simultaneously obtain images of other targets 240.

[0100] The reset camera 480 photographs the target 240 to obtain the position information of the target 240, and then obtains the position information of the first workbench 200, that is, obtains the first position information. The control system compares the first position information with the first preset position information. When the difference between the first position information and the first preset position information is greater than a preset value, the UVW alignment stage 410 adjusts the first workbench 200 to the first preset position according to the obtained first position information, and then starts the loading camera to photograph the material on the first workbench 200 to obtain the position information of the material, that is, the second position information; when the difference between the first position information and the first preset position information is not greater than a preset value, the loading camera is started to photograph the material on the first workbench 200 to obtain the position information of the material, that is, the second position information, and the UVW alignment stage 410 adjusts the first workbench 200 according to the obtained second position information to adjust the material on the first workbench 200 to the second preset position.

[0101] The position information may be in different forms, for example, the coordinates of the center point of the first workbench 200 may be combined with the deflection angle of the first workbench 200. When the acquired position information is compared with the preset position information, the difference between the two includes the distance between the center points, the angle between the line connecting the two center points and the preset straight line, and the deflection angle of the first workbench 200 itself, that is, one distance data and two angle data are used as the basic data of the position information, wherein the distance between the centers and the angle between the line connecting the center points and the preset straight line are used as one set of position information, and the deflection angle of the first workbench 200 itself is used as another set of position information. The two sets of position information are combined to determine the position of the first workbench 200. When the difference between any set of position information in the two sets of position information exceeds the preset value, the UVW alignment table 410 is started to move the first workbench 200 to the first preset position. In other embodiments, the center point distance may be orthogonally decomposed into two directions in the form of three data, namely, two distance data and one angle data. In this data form, any one of the three data may be judged separately. That is, when the difference between any one of the three data and the data of the preset position is greater than a preset value, the UVW alignment table 410 is started to adjust the first workbench 200.

[0102] The UVW alignment table 410 has an alignment plate 411, and its alignment motor drives the alignment plate 411 to move in translation and rotation to achieve the alignment function. The connecting assembly is arranged above the alignment plate 411, and the connecting assembly is fixed relative to the alignment plate 411 in the horizontal direction. The connecting assembly includes a lifting connecting rod 420, and the top of the connecting rod 420 has a connecting portion 421, and the lower surface of the first workbench 200 is provided with a connecting seat 210 adapted to the connecting portion 421.

[0103] In one embodiment of the present invention, a plurality of connecting rods 420 are provided. In a specific embodiment, the number of connecting rods 420 may be 3 or 4. In other embodiments, the connecting portion 421 may be non-circular, and the connecting seat 210 may have a groove or a hole adapted to the connecting portion 421. When the first workbench 200 is located at the origin, the connecting portion 421 may be inserted into the groove or the hole to achieve the connection between the UVW alignment table 410 and the first workbench 200. When a non-circular connecting portion 421 is used, one or more connecting rods 420 may be provided. When the connecting portion 421 is non-circular, a single connecting rod 420 may drive the first workbench 200 to rotate and adjust the position.

[0104] In order to increase the stability when the connection part 421 is connected to the connection base 210, the connection part 421 also includes an electromagnet, and the connection base 210 has a component made of a soft magnetic material or the connection base 210 is made of a soft magnetic material. When the connection part 421 is connected to the connection base 210, the electromagnet is energized, and the soft magnetic material of the connection base 210 is magnetized and attracted thereto. When the connection between the connection part 421 and the connection base 210 needs to be disconnected after the alignment is completed, the electromagnet is powered off, the soft magnetic material is quickly demagnetized, the attraction between the connection part 421 and the connection base 210 disappears, and the connection part 421 is separated from the connection base 210.

[0105] The present invention also proposes another embodiment of a connection component, wherein the connection component includes a top column 430, and the first workbench 200 is provided with a top pin 220 corresponding to the top column 430. The connection component also includes an electromagnetic magnetic attraction structure 470, and the first workbench 200 is provided with a magnetic attraction member 230 corresponding to the electromagnetic magnetic attraction structure 470. The electromagnetic magnetic attraction structure 470 includes a plurality of electromagnet units, and the magnetic attraction member 230 includes a soft magnetic body that matches the plurality of electromagnet units. The soft magnetic body can be provided in plurality to match the plurality of electromagnet units, or can be provided as a whole.

[0106] The distance between the top of the ejector column 430 and the ejector pin 220 is smaller than the distance between the top of the electromagnetic magnetic attraction structure 470 and the bottom of the magnetic attraction member 230 .

[0107] Adopting an electromagnet to adsorb and fix the first workbench 200 is suitable for the case where the workbench is light in weight, and can increase the stability of the connection between the UVW alignment table 410 and the first workbench 200. In the case where the workbench is heavy, such as in a large screen printing machine, the workbench can weigh hundreds of kilograms. In this case, even without the magnetic adsorption of the electromagnet, the alignment table can be stably connected to the UVW alignment table 410.

[0108] The double-table workbench also includes a lifting mechanism 500, which is used to control the connection assembly to rise to connect to the first workbench 200 or to control the connection assembly to lower to detach from the first workbench 200. The lifting mechanism 500 includes a lifting platform 510, a guide column 520, and a driving mechanism for driving the lifting platform 510; the lifting platform 510 is arranged above the UVW alignment platform 410, and the guide column 520 vertically passes through the lifting platform 510 and is vertically connected to the UVW alignment platform 410. The driving mechanism includes a screw rod 531, a motor 530, and a sleeve 532. The motor 530 is connected to the screw rod 531 to drive the screw rod 531 to rotate, and the sleeve 532 is sleeved on the screw rod 531 and fixed to the lifting platform 510.

[0109] After the first workbench 200 slides along the linear rail to the alignment station and completes the loading, the first pressure plate cylinder 121 releases the first workbench 200 and enters the alignment operation. The UVW alignment table 410 is located below the alignment station. During the alignment process, the lifting assembly drives the ejector column 430 to rise and contact with the ejector pin 220, and the electromagnetic magnetic structure 470 has not yet contacted the magnetic component 230. At this time, the origin positioning cylinder 440 is at a height that can push the positioning part 450. The origin positioning cylinder 440 is started to push the positioning part 450, so that the first workbench 200 is at the origin position and the rough alignment is completed; then, the lifting mechanism 500 drives the connecting assembly to rise, so that the electromagnetic magnetic structure 470 contacts the magnetic component 230, and the electromagnet unit in the electromagnetic magnetic structure 470 is started to make the two tightly attracted together; the UVW alignment table 410 is started to accurately align the first workbench 200. Among them, the magnetic attraction member 230 is made of soft magnetic material, which can be quickly magnetized when the electromagnet is powered on, and can be quickly demagnetized when the electromagnet is powered off. In this embodiment, the electromagnetic magnetic attraction structure 470 can be set on the connecting rod 420, or the connecting rod 420 itself can be set as the electromagnetic magnetic attraction structure 470; the magnetic attraction member 230 can be set on the connecting seat 210, or the connecting seat 210 itself can be set as the magnetic attraction member 230. The electromagnetic magnetic attraction structure 470 and the magnetic attraction member 230 arranged in pairs tightly attract the connection component and the first workbench 200, so that the first workbench 200 is fixed in the horizontal direction relative to the alignment plate 411.

[0110] In one embodiment, the top column 430 and the electromagnetic magnetic attraction structure 470 are driven to rise by the lifting mechanism 500 respectively, and the lifting and lowering of the two are independent of each other; in other embodiments, the top column 430 and the electromagnetic magnetic attraction structure 470 are driven to rise or fall synchronously by the lifting mechanism 500. In this embodiment, the top column 430 is set as an elastic and retractable structure, for example, a spring is set under the top column 430. During rough alignment, the top column 430 contacts the ejector pin 220 and applies an upward elastic force to the ejector pin 220, reducing the resistance of the origin positioning cylinder 440 when pushing the first workbench 200; and during fine alignment, the electromagnetic magnetic attraction structure 470 and the magnetic attraction member 230 are attracted, and the top column 430 is squeezed downward. In other embodiments, the ejector pin 220 can also be set as an elastic and retractable structure.

[0111] The present invention also provides a positioning method applied to a double-table workbench, comprising the following steps:

[0112] Step 1: The first workbench 200 moves to the alignment station, and the first pressing plate cylinder 121 is released;

[0113] Step 2: The lifting mechanism 500 drives the origin positioning cylinder 440 to rise to a first preset height, and the origin positioning cylinder 440 pushes the first workbench 200 to the origin position;

[0114] Step 3: The lifting mechanism 500 drives the UVW alignment platform 410 to rise to a second preset height, so that the UVW alignment platform 410 is connected to the first workbench 200 for alignment;

[0115] Step 4: The first pressing plate cylinder 121 presses the first workbench 200;

[0116] Step 5: The elevator drives the UVW alignment table 410 and the origin positioning cylinder 440 to descend, so that the UVW alignment table 410 and the origin positioning cylinder 440 are separated from the first workbench 200;

[0117] Step 6: The first workbench 200 moves to the working station, and the second workbench 300 moves to the alignment station.

[0118] Wherein, step 2 comprises:

[0119] Step 2.1: The lifting mechanism 500 drives the origin positioning cylinder 440 to rise to a first preset height, so that the origin positioning cylinder 440 rises to the height of the first cam follower 451 disposed below the first workbench 200.

[0120] Step 2.2: The origin positioning cylinder 440 pushes the first cam follower 451 to position the first workbench 200 at the origin position.

[0121] After step 6, also include:

[0122] Step 7: Release the second pressure plate cylinder;

[0123] Step 8: The lifting mechanism 500 drives the origin positioning cylinder 440 to rise to a first preset height, and the origin positioning cylinder 440 pushes the second workbench 300 to the origin position;

[0124] Step 9: The lifting mechanism 500 drives the UVW alignment platform 410 to rise to a second preset height, so that the UVW alignment platform 410 is connected to the second workbench 300 for alignment;

[0125] Step 10: The second pressing plate cylinder presses the second workbench 300;

[0126] Step 11: The elevator drives the UVW alignment platform 410 and the origin positioning cylinder 440 to descend, so that the UVW alignment platform 410 and the origin positioning cylinder 440 are separated from the second workbench 300;

[0127] Step 12: The second workbench 300 moves to the working station, and the first workbench 200 moves to the alignment station.

[0128] The above steps 1-5 are steps for aligning the first workbench 200. After the first workbench 200 is loosened, it is first moved to the origin position by the origin positioning cylinder 440, and then accurately aligned by the UVW alignment table 410. After accurate alignment, the first workbench 200 is locked, and the UVW alignment table 410 and the first workbench 200 are separated.

[0129] After the alignment of the first workbench 200 is completed, the first workbench 200 slides to the working station along the linear slide rail, and the second workbench 300 slides to the alignment station along the linear slide rail. The above steps 7-11 are the steps of the alignment of the second workbench 300. After the alignment of the second workbench 300 is completed, the first workbench 200 returns to the alignment station, and the second workbench 300 slides to the working station, and then returns to step 1 to complete a work cycle. The alignment method proposed in the present invention effectively solves the problem of limited alignment stroke when the UVW alignment table 410 is applied to a double-table workbench through two alignments, so that the UVW alignment table 410 can give full play to its advantages of precise alignment in the double-table workbench, and achieve efficient and accurate alignment.

[0130] The present invention also provides another alignment method applied to a double-table workbench, comprising the following steps:

[0131] Step 1: The first workbench 200 moves to the alignment station;

[0132] Step 2: The reset camera 480 photographs the target 240 located on the first workbench 200 to obtain first position information;

[0133] Step 3: Compare the first location information with the first preset location information; when the difference between the first location information and the first preset location information is not greater than a preset value, proceed to step 5; when the difference between the first location information and the first preset location information is greater than a preset value, proceed to step 4;

[0134] Step 4: The UVW alignment platform 410 adjusts the first workbench 200 to a first preset position according to the acquired first position information;

[0135] Step 5: The loading camera photographs the material on the first workbench 200 to obtain second position information;

[0136] Step 6: The UVW alignment platform 410 adjusts the first workbench 200 according to the acquired second position information to adjust the material on the first workbench 200 to the second preset position.

[0137] The alignment method proposed by the present invention adopts two visual alignments. In the first rough alignment, the position of the first workbench 200 is judged. If the deviation of its position is small and within the alignment range of the fine alignment, the fine alignment is directly performed. If the deviation of its position is large, the rough alignment is first performed to make its position within the range of the fine alignment. The method can save unnecessary rough alignment, and rough alignment is only performed when needed, which can save alignment time, simplify the alignment process, and improve alignment efficiency.

[0138] Wherein, before step 4 or before step 6, the method further includes:

[0139] Step a: The lifting mechanism 500 drives the UVW alignment platform 410 to rise to a preset height, so that the UVW alignment platform 410 is connected to the first workbench 200 .

[0140] After step 4, the method further includes:

[0141] Step b: the lifting mechanism 500 drives the UVW alignment platform 410 to descend, so that the UVW alignment platform 410 is separated from the first workbench 200 and reset.

[0142] After step 6, also include:

[0143] Step 7: The lifting mechanism 500 drives the UVW alignment platform 410 to descend, so that the UVW alignment platform 410 is separated from the first workbench 200;

[0144] Step 8: The first workbench 200 moves to the working station, and the second workbench 300 moves to the alignment station.

[0145] It should be noted that the second workbench 300 has the same function as the first workbench 200, and the two only differ in height and width so that they can run alternately, and there is no other actual difference in structure. After the second workbench 300 moves to the alignment station, its alignment process is the same as the alignment process of the first alignment table 200, and will not be repeated.

[0146] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A double-top workbench, characterized in that: include: A conveying mechanism, the conveying mechanism comprising a first slide rail and a second slide rail; a first slider is provided on the first slide rail; a second slider is provided on the second slide rail; two ends of the conveying mechanism are respectively an alignment station and a working station; A first workbench connected to the first slider; a second workbench connected to the second slider; the first workbench and the second workbench can slide back and forth along the first slide rail and the second slide rail at the alignment station and the working station respectively; An alignment component is arranged at the alignment station; the alignment component comprises a UVW alignment table and a connecting component for connecting the UVW alignment table to the first workbench or the second workbench; An alignment plate is provided above the UVW alignment platform, the connection component is arranged above the alignment plate, and the connection component is fixed relative to the alignment plate in a horizontal direction; The lower surface of the first workbench is provided with two positioning parts; the UVW alignment table is located below the alignment station, and the alignment assembly further comprises two origin positioning cylinders matched with the two positioning parts; The double-table workbench further includes a lifting mechanism, which is used to control the connection assembly to rise so as to connect to the first workbench or to control the connection assembly to lower so as to detach from the first workbench.

2. The double-top workbench according to claim 1, characterized in that: The first sliding block is connected to a first locking mechanism, and the first sliding block can be lockably connected to the first workbench through the first locking mechanism.

3. The double-top workbench as claimed in claim 2, characterized in that: The first locking mechanism includes a first pressing plate cylinder and a first pressing plate.

4. The double-top workbench according to claim 1, characterized in that: The first slide rail is located inside the second slide rail, and the upper surface of the first workbench is lower than the lower surface of the second workbench.

5. The double-top workbench according to claim 1, characterized in that: A target is arranged on the first workbench, and the alignment component further comprises a reset camera for photographing the target to determine the position of the first workbench.

6. The double-top workbench according to claim 5, characterized in that: The target is arranged on the edge of the first workbench.

7. The double-top workbench according to claim 5, characterized in that: The UVW alignment platform is located below the alignment station, and the target is arranged on the lower surface of the first workbench.

8. The double-top workbench according to claim 7, characterized in that: The alignment assembly also includes a light source for illuminating the target.

9. The double-top workbench according to claim 5, characterized in that: A plurality of the targets are provided, and the plurality of the targets are arranged at intervals.

10. The double-top workbench according to claim 9, characterized in that: At least two of the targets are each provided with a reset camera corresponding thereto.

11. The double-top workbench according to claim 1, characterized in that: The two positioning parts are symmetrically centered with the center of the first workbench; and the two origin positioning cylinders are symmetrically arranged.

12. The double-top workbench according to claim 11, characterized in that: The origin positioning cylinder comprises a cylinder body and a piston rod, the piston rod is connected with a pushing portion, and the pushing portion is adapted to the positioning portion.

13. The double-top workbench according to claim 12, characterized in that: The positioning portion comprises a cam follower, and the pushing portion comprises a positioning recess matched with the cam follower.

14. The double-top workbench according to claim 13, characterized in that: The connecting assembly comprises a lifting and lowering connecting rod, and the top end of the connecting rod is provided with a connecting portion.

15. The double-top workbench according to claim 14, characterized in that: A plurality of connecting rods are provided.

16. The double-top workbench according to claim 14, characterized in that: A connecting seat adapted to the connecting portion is provided on the lower surface of the first workbench.

17. The double-top workbench according to claim 16, characterized in that: The connecting portion is non-circular, and the connecting seat has a groove or a hole matched with the connecting portion.

18. The double-top workbench according to claim 16, characterized in that: The connecting portion includes an electromagnet, and the connecting seat has a component made of a soft magnetic material or the connecting seat is made of a soft magnetic material.

19. The double-top workbench according to claim 1, characterized in that: The connecting assembly further comprises an ejector column, and the first workbench is provided with an ejector pin corresponding to the ejector column.

20. The double-top workbench according to claim 19, characterized in that: The connecting assembly also includes an electromagnetic magnetic attraction structure, and the first workbench is provided with a magnetic attraction member corresponding to the electromagnetic magnetic attraction structure.

21. The double-top workbench according to claim 20, characterized in that: The electromagnetic magnetic attraction structure includes a plurality of electromagnet units, and the magnetic attraction member includes a soft magnetic body matched with the plurality of electromagnet units.

22. The double-top workbench according to claim 21, characterized in that: The distance from the top of the ejector column to the ejector pin is smaller than the distance from the top of the electromagnetic magnetic attraction structure to the bottom of the magnetic attraction member.

23. The double-top workbench according to any one of claims 1 to 22, characterized in that: The lifting mechanism is arranged below the UVW alignment platform to drive the UVW alignment platform to rise or fall.

24. The double-top workbench according to any one of claims 1 to 22, characterized in that: The lifting mechanism comprises a lifting platform, a guide column and a driving mechanism for driving the lifting platform; the lifting platform is arranged above the UVW alignment platform, and the guide column vertically passes through the lifting platform and is vertically connected to the UVW alignment platform.

25. The double-top workbench according to claim 24, characterized in that: The driving mechanism comprises a screw rod, a motor and a shaft sleeve. The motor is connected to the screw rod to drive the screw rod to rotate. The shaft sleeve is sleeved on the screw rod and fixed to the lifting platform.

26. The double-top workbench according to claim 1, characterized in that: The conveying mechanism also includes a driving motor, a conveyor belt and a tensioning wheel; the tensioning wheel is arranged on the inner side of the conveyor belt so that the conveyor belt has a first belt surface and a second belt surface, and the first belt surface and the second belt surface move synchronously and in opposite directions; the first slider is connected to the first belt surface of the conveyor belt, and the second slider is connected to the second belt surface of the conveyor belt.

27. A positioning method for a double-table workbench, wherein both ends of the double-table workbench are provided with a positioning station and a working station; the double-table workbench is provided with a first workbench that can move back and forth between the positioning station and the working station, and a second workbench that can move back and forth between the positioning station and the working station; a first pressure plate cylinder is provided on the side of the first workbench, and a second pressure plate cylinder is provided on the side of the second workbench; the positioning station is provided with a positioning component, and the positioning component includes a UVW positioning table and a connecting component for connecting the UVW positioning table to the first workbench or the second workbench; the positioning station is provided with a lifting mechanism and an origin positioning cylinder, and the lifting mechanism is used to control the connection component to rise to connect to the first workbench or to control the connection component to lower to detach from the first workbench; the lower surface of the first workbench is provided with a first cam follower; it is characterized in that: The steps include: Step 1: The first workbench moves to the alignment station, and the first pressing plate cylinder is released; Step 2: The lifting mechanism drives the origin positioning cylinder to rise to a first preset height, and the origin positioning cylinder pushes the first workbench to the origin position; Step 3: The lifting mechanism drives the UVW alignment table to rise to a second preset height, so that the UVW alignment table is connected to the first workbench for alignment; Step 4: The first pressing plate cylinder presses the first workbench; Step 5: The lifting mechanism drives the UVW alignment table and the origin positioning cylinder to descend, so that the UVW alignment table and the origin positioning cylinder are separated from the first workbench; Step 6: The first workbench moves to the working station, and the second workbench moves to the alignment station.

28. The alignment method according to claim 27, characterized in that: Step 2 includes: Step 2.1: The lifting mechanism drives the origin positioning cylinder to rise to a first preset height, so that the origin positioning cylinder rises to the height of a first cam follower disposed below the first workbench; Step 2.2: The origin positioning cylinder pushes the first cam follower to make the first workbench located at the origin position.

29. The alignment method according to claim 27, characterized in that: After step 6, also include: Step 7: Release the second pressure plate cylinder; Step 8: The lifting mechanism drives the origin positioning cylinder to rise to a first preset height, and the origin positioning cylinder pushes the second workbench to the origin position; Step 9: The lifting mechanism drives the UVW alignment table to rise to a second preset height, so that the UVW alignment table is connected to the second workbench for alignment; Step 10: The second pressing plate cylinder presses the second workbench; Step 11: The lift can drive the UVW alignment table and the origin positioning cylinder to descend, so that the UVW alignment table and the origin positioning cylinder are separated from the second workbench; Step 12: The second workbench moves to the working station, and the first workbench moves to the alignment station.

30. A positioning method for a double-table workbench, wherein both ends of the double-table workbench are provided with a positioning station and a working station; the double-table workbench is provided with a first workbench that can move back and forth between the positioning station and the working station, and a second workbench that can move back and forth between the positioning station and the working station; a target is provided on the first workbench; the double-table workbench includes a reset camera for photographing the target to determine the position of the first workbench; the positioning station is provided with a lifting mechanism and an alignment component, the alignment component includes a UVW alignment table and a connecting component for connecting the UVW alignment table to the first workbench or the second workbench, the lifting mechanism is used to control the connection component to rise to connect to the first workbench or to control the connection component to lower to detach from the first workbench; characterized in that: The steps include: Step 1: The first workbench moves to the alignment station; Step 2: resetting the camera to photograph the target on the first workbench to obtain first position information; Step 3: Compare the first location information with the first preset location information; when the difference between the first location information and the first preset location information is not greater than a preset value, proceed to step 5; when the difference between the first location information and the first preset location information is greater than a preset value, proceed to step 4; Step 4: The UVW alignment platform adjusts the first workbench to a first preset position according to the first position information obtained; Step 5: The loading camera photographs the material on the first workbench to obtain second position information; Step 6: The UVW alignment platform adjusts the first workbench according to the acquired second position information to adjust the material on the first workbench to the second preset position.

31. The alignment method according to claim 30, characterized in that: Before step 4, or before step 6, the method further includes: Step a: The lifting mechanism drives the UVW alignment platform to rise to a preset height, so that the UVW alignment platform is connected to the first workbench.

32. The alignment method according to claim 31, characterized in that: After step 4, the method further includes: Step b: The lifting mechanism drives the UVW alignment table to descend, so that the UVW alignment table is separated from the first workbench and reset.

33. The alignment method according to claim 31, characterized in that: After step 6, also include: Step 7: The lifting mechanism drives the UVW alignment table to descend, so that the UVW alignment table is separated from the first workbench; Step 8: The first workbench moves to the working station, and the second workbench moves to the alignment station.

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