Clamp for processing touch screen

Abstract

The invention discloses a clamp for processing a touch screen, which comprises a support plate and a suction cup arranged on the support plate and used for fixing the touch screen, and further comprises a first direction adjusting assembly, a second direction adjusting assembly and a controller, the first direction adjusting assembly comprises a first driving mechanism and a first pushing piece connected to the first driving mechanism, the first pushing piece is provided with a first pushing face, and a first pressure sensor and a second pressure sensor are arranged on the first pushing face; the second direction adjusting assembly comprises a second driving mechanism and a second pushing piece connected to the second driving mechanism, the second pushing piece is provided with a second pushing face, and a third pressure sensor and a fourth pressure sensor are arranged on the second pushing face. According to the clamp for touch screen machining, a precise and convenient positioning guide mechanism is designed, precise positioning of the touch screen on the clamp can be achieved, the production efficiency and the product quality are improved, and the application range is wide.

Description

Technical Field

[0001] The present invention relates to the technical field of touch screen processing, and particularly to a fixture for touch screen processing. Background Art

[0002] In the fields of touch screen manufacturing, detection, and application, the fixation of touch screens is a fundamental and crucial link. With the development of technology, touch screens are widely used in various fields such as smartphones and industrial control devices. To ensure their stable performance, precise fixation is required during manufacturing. For example, in the production line of smartphones, precise assembly of touch screens and components is necessary. Fixation deviations can lead to problems such as abnormal display, affecting the yield rate and user experience. During detection, only by stably and accurately fixing the touch screen can the detection data of performance indicators such as touch accuracy be ensured to be accurate and reliable. Otherwise, detection errors may cause unqualified products to enter the market, damaging the rights and interests of consumers, as well as the reputation and competitiveness of enterprises. Therefore, in the current fields of touch screen manufacturing, detection, and related applications, the fixation operation of touch screens is a basic and crucial link.

[0003] A general fixture for touch screen processing is disclosed in the Chinese patent with the application number 202411744760.3, which exposes obvious defects in the touch screen fixation process. When loading the touch screen into the fixture, it is difficult to control the position of the touch screen. During actual operation, the length direction of the touch screen often cannot be accurately aligned with the length direction of the fixture. The main reason for this problem is the lack of a precise and convenient positioning and guiding mechanism in the existing technology. On the one hand, during the docking process of the touch screen and the fixture, there are no clear and intuitive positioning marks or auxiliary positioning structures, making it difficult for operators to accurately adjust the position based on experience alone, and it is hard to ensure the accuracy of each operation. On the other hand, the design of the fixture itself may not fully consider the different specifications and sizes of touch screens and their adaptability under various working conditions, resulting in difficulty in achieving general and reliable positioning when facing different types of touch screens. In summary, there is an urgent need for a new technical solution to solve the problems in the existing technology that the position of the touch screen is not easy to control and it is difficult to effectively fix during fixation, so as to improve the operation stability and reliability of the touch screen in various related links. Summary of the Invention

[0004] The present invention discloses a fixture for touch screen processing to solve the technical problems in the existing technology that the position of the touch screen is not easy to control and it is difficult to effectively fix during fixation.

[0005] To solve the above problems, the present invention adopts the following technical solutions: In a first aspect, the present application provides a fixture for processing a touch screen, which is used to fix a touch screen having a first side and a second side perpendicular to each other, and includes a support plate and a suction cup disposed on the support plate for fixing the touch screen, and further includes a first direction adjustment component, a second direction adjustment component and a controller; wherein, the suction cup is rotatably connected to the support plate; The first direction adjustment component includes a first driving mechanism and a first pushing member connected to the first driving mechanism. The first pushing member has a first pushing surface for pushing the first side of the touch screen, and a first pressure sensor and a second pressure sensor are disposed on the first pushing surface; The second direction adjustment component includes a second driving mechanism and a second pushing member connected to the second driving mechanism. The second pushing member has a second pushing surface for pushing the second side of the touch screen, and a third pressure sensor and a fourth pressure sensor are disposed on the second pushing surface; The pushing directions of the first pushing member and the second pushing member are perpendicular to each other, and the heights of the first pushing member and the second pushing member are both matched with the installation height when the touch screen is adsorbed on the suction cup; The first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor are respectively electrically connected to the controller.

[0006] The technical solution adopted by the present invention can achieve the following beneficial effects: The fixture for processing a touch screen provided by the present application designs a set of precise and convenient positioning and guiding mechanisms, which can realize the precise positioning of the touch screen on the fixture, improve production efficiency and product quality, and have a wide range of applications. Specifically, it has the following advantages: (1) It can achieve the precise positioning of the touch screen. When in use, first use the first direction adjustment component (or the second direction adjustment component) to adjust the direction of the first side (or the second side) of the touch screen, that is, select one side to position the touch screen in one direction, and then use the second direction adjustment component (or the first direction adjustment component) to perform the overall positioning of the touch screen.

[0007] If the first-direction adjustment component is first used to adjust the direction of the first side of the touch screen, the first driving mechanism is used to drive the first pushing member to extend, and the first side of the touch screen is pushed through the first pushing surface. The first pressure sensor and the second pressure sensor on the first pushing surface are used to detect the pushing force of the first pushing surface on the first side of the touch screen. When the difference between the detection values of the first pressure sensor and the second pressure sensor is less than threshold A, it indicates that the touch screen is adjusted to the accurate position in the first direction, and the controller controls the first driving mechanism to stop advancing, and the extension length of the first pushing member can be obtained. At this time, the touch screen is positioned through the second-direction adjustment component. The second driving mechanism drives the second pushing member to extend, and the second side of the touch screen is pushed through the second pushing surface. The third pressure sensor and the fourth pressure sensor on the second pushing surface are used to detect the pushing force of the second pushing surface on the second side of the touch screen. When the difference between the detection values of the third pressure sensor and the fourth pressure sensor is less than threshold B, the controller controls the second driving mechanism to stop advancing, and the extension length of the second pushing member can be obtained.

[0008] If the second-direction adjustment component is first used to adjust the direction of the second side of the touch screen, the second driving mechanism is used to drive the second pushing member to extend, and the second side of the touch screen is pushed through the first pushing surface. The third pressure sensor and the fourth pressure sensor on the second pushing surface are used to detect the pushing force of the second pushing surface on the second side of the touch screen. When the difference between the detection values of the third pressure sensor and the fourth pressure sensor is less than threshold B, it indicates that the touch screen is adjusted to the accurate position in the second direction, and the controller controls the second driving mechanism to stop advancing, and the extension length of the second pushing member can be obtained. At this time, the touch screen is positioned through the first-direction adjustment component. The first driving mechanism drives the first pushing member to extend, and the first side of the touch screen is pushed through the first pushing surface. The first pressure sensor and the second pressure sensor on the first pushing surface are used to detect the pushing force of the first pushing surface on the first side of the touch screen. When the difference between the detection values of the first pressure sensor and the second pressure sensor is less than threshold A, the controller controls the first driving mechanism to stop advancing, and the extension length of the first pushing member can be obtained.

[0009] Through the above method, combining the final extension lengths of the first pushing member and the second pushing member and calculating the assembly position coordinates of the touch screen, the position of the touch screen on the fixture can be accurately obtained, the long side and the center point of the touch screen can be determined, high-precision positioning can be achieved, and the strict requirements for position accuracy in touch screen processing can be met.

[0010] (2) It improves the operation convenience and efficiency. When in use, only one of the first direction and the second direction needs to be adjusted, simplifying the operation process. The operator does not need to repeatedly adjust in two directions, reducing the adjustment time and operation complexity and improving the work efficiency. In actual production, the touch screen can be quickly fixed in the appropriate position, accelerating the production rhythm. During processing, the first pushing member and the second pushing member can be retracted, which shows great convenience in the loading and unloading process. When loading, the retracted pushing member does not hinder the placement of the touch screen, facilitating the operator to quickly place the touch screen on the suction cup; when unloading, the retracted pushing member also makes it smoother to remove the touch screen, reducing the auxiliary time and further improving the production efficiency.

[0011] (3) It enhances the versatility and adaptability of the device. The fixture can adapt to touch screens of different shapes and sizes, enhancing the versatility of the device.

[0012] (4) It improves the automation and intelligence level. The controller automatically controls the action of the driving mechanism according to the detection value of the pressure sensor and calculates the assembly position coordinates, realizing the automatic and intelligent control of the fixture. It reduces manual intervention, reduces the errors caused by human factors, and improves the stability of the production process and the consistency of product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of an embodiment of the present application; Figure 2 is Figure 1 the top view of Figure 3 is Figure 2 the enlarged schematic view of part A in Figure 4 is Figure 2 the enlarged schematic view of part B in Figure 5 is a schematic structural diagram of an embodiment of the present application (the first direction adjustment component and the second direction adjustment component are not drawn); Figure 6 is Figure 5 the top view of Figure 7 is Figure 6 the cross-sectional view taken along C-C in Figure 8 is Figure 7 the enlarged schematic view of part D in Figure 9 (a) is a schematic diagram showing the working process of an embodiment of the present application Figure One ; Figure 9 (b) is a schematic diagram showing the working process of an embodiment of the present application Figure Two ; Figure 10(a) is a schematic diagram of the working process of an embodiment of the present application Figure Three ; Figure 10 (b) is a schematic diagram of the working process of an embodiment of the present application Figure Four ; Figure 11 is a schematic diagram of the state when an embodiment of the present application is installed on the operating table; Figure 12 is a schematic diagram of the structure of the first direction adjustment component in another embodiment of the present application; Figure 13 is Figure 12 the top view of Figure 14 is a schematic diagram of the structure of the second direction adjustment component in another embodiment of the present application; Figure 15 is Figure 14 the top view of Figure 16 is the top view of the first direction adjustment component in yet another embodiment of the present application; Figure 17 is the top view of the second direction adjustment component in yet another embodiment of the present application; Figure 18 (a) is a schematic diagram of the working process of another embodiment of the present application Figure One ; Figure 18 (b) is a schematic diagram of the working process of another embodiment of the present application Figure Two ; Figure 19 (a) is a schematic diagram of the working process of another embodiment of the present application Figure Three ; Figure 19 (b) is a schematic diagram of the working process of another embodiment of the present application Figure Four ; Figure 20 (a) is a schematic diagram of the working process of another embodiment of the present application Figure Five ; Figure 20 (b) is a schematic diagram of the working process of another embodiment of the present application Figure Six 。

[0014] In the figure: 10, touch screen; 101, first side; 102, second side; 20, support plate; 201, mounting hole; 30, suction cup; 301, disc body; 3011, air extraction hole; 3012, suction cavity; 302, air extraction pipe; 3021, quick-release joint; 3022, fixed pipe; 3023, rotating pipe; 40, first direction adjustment component; 401, first driving mechanism; 402, first push rod; 403, first push plate; 404, first flexible plate; 4041, first intermediate plate; 4042, first wing plate; 50, second direction adjustment component; 501, second driving mechanism; 502, second push rod; 503, second push plate; 504, second flexible plate; 5041, second intermediate plate; 5042, second wing plate; 60, first pressure sensor; 70, second pressure sensor; 80, third pressure sensor; 90, fourth pressure sensor; 100, connecting plate; 110, electromagnet; 120, connecting pipe body; 130, synchronous rotating member; 140, permanent magnet; 150, elastic member; 160, optical signal generating unit; 170, optical signal receiving unit; 180, grating; 190, guide post; 200, fifth pressure sensor; 210, sixth pressure sensor; 220, sleeve; 230, mounting housing; 240, first pushing surface; 250, second pushing surface; 260, operating table; 270, rotating connecting member. Detailed implementation manners

[0015] In the following embodiments, the description of the usage method is based on first adjusting the direction of the first side 101 of the touch screen 10 by using the first direction adjustment component 40, and then positioning the touch screen 10 by using the second direction adjustment component 50. Of course, it is also possible to first adjust the direction of the second side 102 of the touch screen 10 by using the second direction adjustment component 50, and then position the touch screen 10 by using the first direction adjustment component 40.

[0016] Please refer to Figures 1 - 8 , in which, Figure 5 is a schematic structural diagram when the first direction adjustment component 40 and the second direction adjustment component 50 are not drawn). The present application provides a fixture for processing a touch screen, which is used to fix a touch screen 10 having mutually perpendicular first side 101 and second side 102, and includes a support plate 20 and a suction cup 30 provided on the support plate 20 for fixing the touch screen 10, and further includes a first direction adjustment component 40, a second direction adjustment component 50 and a controller; The suction cup 30 is rotatably connected to the support plate 20; the first direction adjustment assembly 40 includes a first driving mechanism 401 and a first pushing member connected to the first driving mechanism 401. The first pushing member has a first pushing surface 240 that pushes the first side surface 101 of the touch screen 10. A first pressure sensor 60 and a second pressure sensor 70 are provided on the first pushing surface 240. The first pressure sensor 60 and the second pressure sensor 70 are used to detect the driving force between the first pushing surface 240 and the first side surface 101 of the touch screen 10; the second direction adjustment assembly 50 includes a second driving mechanism 501 and a second pushing member connected to the second driving mechanism 501. The second pushing member has a second pushing surface 250 that pushes the second side surface 102 of the touch screen 10. A third pressure sensor 80 and a fourth pressure sensor 90 are provided on the second pushing surface 250. The third pressure sensor 80 and the fourth pressure sensor 90 are used to detect the driving force between the second pushing surface 250 and the second side surface 102 of the touch screen 10; the first pressure sensor 60, the second pressure sensor 70, the third pressure sensor 80, and the fourth pressure sensor 90 are respectively electrically connected to the controller; the pushing directions of the first pushing member and the second pushing member are perpendicular to each other, and the heights of the first pushing member and the second pushing member are both matched with the installation height when the touch screen 10 is adsorbed on the suction cup 30. The controller can be configured as follows: a) When the difference between the detection values of the first pressure sensor 60 and the second pressure sensor 70 is less than the threshold value A, control the first driving mechanism 401 to stop advancing, satisfying: 1N ≤ A ≤ 10N; b) When the difference between the detection values of the third pressure sensor 80 and the fourth pressure sensor 90 is less than the threshold value B, control the second driving mechanism 501 to stop advancing, satisfying: 1N ≤ B ≤ 10N; c) Calculate the assembly position coordinates of the touch screen 10 according to the final extended length of the first pushing member and the final extended length of the second pushing member. It can be understood that the threshold values A and B are used to quantify the allowable force deviation on both sides, and their values need to be set according to the size, material, and test requirements of the touch screen 10 (for example, 1 - 5N can be taken for small-sized screens, and 5 - 10N can be taken for large-sized screens) to ensure that the deviation is within the range that does not affect the test results or assembly accuracy.

[0017] In some embodiments, the first pushing member includes a first push rod 402 and a first push plate 403. One end of the first push rod 402 is connected to the first driving mechanism 401, and the other end of the first push rod 402 is connected to the first push plate 403. The plane where the first push plate 403 is located is parallel to the first side surface 101 of the touch screen 10. A first flexible plate 404 with a first pushing surface 240 is provided on the first push plate 403.

[0018] In some embodiments, the second pushing member includes a second push rod 502 and a second push plate 503. One end of the second push rod 502 is connected to the second driving mechanism 501, and the other end of the second push rod 502 is connected to the second push plate 503. The plane where the second push plate 503 is located is parallel to the second side surface 102 of the touch screen 10. A second flexible plate 504 with a second pushing surface 250 is provided on the second push plate 503. It can be understood that both the first flexible plate 404 and the second flexible plate 504 are made of flexible materials, which are elastic by themselves. When stressed, they can elastically deform, disperse stress by expanding the contact area, absorb impact energy by using the viscoelastic damping effect, and extend the deformation time to reduce the impact force; avoid damage to the touch screen 10 caused by stress concentration and rigid collision, and the characteristics of low friction and no particle shedding can protect the coating layer, and can also reduce the reaction force fluctuation of the driving mechanism and extend the service life of the device.

[0019] In some embodiments, the fixture further includes a fifth pressure sensor 200; both sides of the first flexible plate 404 are inclined towards the suction cup 30; the first pressure sensor 60 and the second pressure sensor 70 are symmetrically arranged in the edge areas on both sides of the first flexible plate 404; the fifth pressure sensor 200 is arranged on the first pushing surface 240 and is located in the middle of the first flexible plate 404, and the fifth pressure sensor 200 is electrically connected to the controller. The controller is configured to control the first driving mechanism 401 to stop advancing when the difference between the detection values of the first pressure sensor 60 and the second pressure sensor 70 is less than the threshold A and the detection value of the fifth pressure sensor 200 is greater than zero. It can be understood that the first pressure sensor 60 and the second pressure sensor 70 are respectively arranged at the edges on both sides of the first flexible plate 404, and the fifth pressure sensor 200 is located in the middle of the first flexible plate 404. First, the first flexible plate 404 is made of flexible material and is elastic by itself, which can protect the touch screen 10. Second, the controller reads the signals of the first pressure sensor 60, the second pressure sensor 70 and the fifth pressure sensor 200 at the same time, avoiding abnormal shutdown caused by misjudgment of a single sensor, improving the reliability of the fixture use, and improving the positioning accuracy of the touch screen 10. Third, by adjusting the threshold A and the thrust preset value detected by the fifth pressure sensor 200, the same fixture can be adapted to touch screen 10 products of different sizes or strengths, and only the controller parameters need to be modified to switch the production model, reducing the customization cost of the fixture and improving the flexibility of the production line. Fourth, it is also possible to reject products with abnormal stress or adjust the process parameters in time through the feedback of the first pressure sensor 60, the second pressure sensor 70 and the fifth pressure sensor 200 in advance, avoiding rework caused by poor positioning in the previous process in the subsequent process, reducing the production cost and improving the yield.

[0020] In some embodiments, the first flexible plate 404 includes a first intermediate plate 4041 and two first wing plates 4042 symmetrically connected to both sides of the first intermediate plate 4041. The outer edges of the two first wing plates 4042 are inclined towards the suction cup 30. The first pressure sensor 60 and the second pressure sensor 70 are respectively located on the two first wing plates 4042, and the fifth pressure sensor 200 is located on the first intermediate plate 4041.

[0021] Please refer to Figure 12 、 Figure 13 , in some embodiments, the first wing plate 4042 is a rectangular plate.

[0022] Please refer to Figure 16 , in some embodiments, the first wing plate 4042 is an arc-shaped plate.

[0023] In some embodiments, the fixture further includes a sixth pressure sensor 210. Both sides of the second flexible plate 504 are inclined towards the suction cup 30. The third pressure sensor 80 and the fourth pressure sensor 90 are symmetrically arranged in the edge regions on both sides of the second flexible plate 504. The sixth pressure sensor 210 is disposed on the second pushing surface 250 and is located in the middle of the second flexible plate 504. The sixth pressure sensor 210 is electrically connected to the controller. The controller is configured to control the second driving mechanism 501 to stop advancing when the difference between the detection values of the third pressure sensor 80 and the fourth pressure sensor 90 is less than the threshold B and the detection value of the sixth pressure sensor 210 is greater than zero. The second flexible plate 504 and the first flexible plate 404 play similar roles and will not be elaborated here.

[0024] In some embodiments, the second flexible plate 504 includes a second intermediate plate 5041 and two second wing plates 5042 symmetrically connected to both sides of the second intermediate plate 5041. The outer edges of the two second wing plates 5042 are inclined towards the suction cup 30. The third pressure sensor 80 and the fourth pressure sensor 90 are respectively located on the two second wing plates 5042, and the sixth pressure sensor 210 is located on the second intermediate plate 5041.

[0025] Please refer to Figure 14 、 Figure 15 , in some embodiments, the second wing plate 5042 is a rectangular plate.

[0026] Please refer to Figure 17 , in some embodiments, the second wing plate 5042 is an arc-shaped plate.

[0027] In some embodiments, the first pressure sensor 60 and the second pressure sensor 70 are located at the same installation height, and the detection centers of the first pressure sensor 60 and the second pressure sensor 70 are respectively aligned with two side edges of the first side surface 101 of the touch screen 10. It can be understood that the first pressure sensor 60 and the second pressure sensor 70 are used to adjust the position of the first side surface 101 of the touch screen 10, and the edges of the first side surface 101 and the second side surface 102 of the touch screen 10 are key reference points during positioning. By aligning the detection centers of the first pressure sensor 60 and the second pressure sensor 70 with two side edges at the same height of the first side surface 101 respectively, the pressure distribution at the edge positions at the same height of the first side surface 101 can be directly detected. When the touch screen 10 is offset, the pressures on both side edges will be different. The controller judges the offset direction through the difference value, and the first driving mechanism 401 drives the first pushing member to continue to push the touch screen 10 forward. As the first pushing member continues to push, the touch screen 10 will rotate with the suction cup 30 until the difference value between the detection values of the first pressure sensor 60 and the second pressure sensor 70 is less than the threshold value A, and then the control of the first driving mechanism 401 to stop advancing is carried out. Through the edge pressure comparison, the present application can quickly identify the translational offset of the touch screen 10 in the horizontal direction, and solves the problem of difficult edge alignment caused by adjustment only based on experience in the prior art. If the touch screen 10 has an angular tilt, the pressures on both side edges will be significantly unequal. The controller can judge through the difference value and drive the first pushing member to make fine adjustments, and cooperate with the rotation function of the suction cup 30 to achieve calibration.

[0028] In some embodiments, the third pressure sensor 80 and the fourth pressure sensor 90 are located at the same installation height, and the detection centers of the third pressure sensor 80 and the fourth pressure sensor 90 are respectively aligned with two side edges of the second side surface 102 of the touch screen 10.

[0029] In some embodiments, the midpoint of the line connecting the first pressure sensor 60 and the second pressure sensor 70 coincides with the geometric center of the first side surface 101 of the touch screen 10.

[0030] In some embodiments, the midpoint of the line connecting the third pressure sensor 80 and the fourth pressure sensor 90 coincides with the geometric center of the second side surface 102 of the touch screen 10.

[0031] In some embodiments, on the first side surface 101 of the touch screen 10, the length of the line connecting the positions where the detection centers of the first pressure sensor 60 are aligned and the second pressure sensor 70 are aligned is 80% - 95% of the length of the first side surface 101 of the touch screen 10; on the second side surface 102 of the touch screen 10, the length of the line connecting the positions where the detection centers of the third pressure sensor 80 are aligned and the fourth pressure sensor 90 are aligned is 80% - 95% of the length of the second side surface 102 of the touch screen 10. It can be understood that the middle 80% - 95% area of the first side surface 101 of the touch screen 10 and the middle 80% - 95% area of the second side surface 102 of the touch screen 10 are the main stress areas, and there may be positioning blind spots at the extreme edge positions due to screen chamfers, arc designs, etc.

[0032] In some embodiments, the materials of the first flexible plate 404 and the second flexible plate 504 are each selected from any one of silicone, polyurethane, and nitrile rubber.

[0033] In some embodiments, the fifth pressure sensor 200 has the same installation height as the first pressure sensor 60 and the second pressure sensor 70, and the detection center point of the fifth pressure sensor 200 is aligned with the geometric center of the first side surface 101 of the touch screen 10; the sixth pressure sensor 210 has the same installation height as the third pressure sensor 80 and the fourth pressure sensor 90; the detection center point of the sixth pressure sensor 210 is aligned with the geometric center of the second side surface 102 of the touch screen 10.

[0034] In some embodiments, the fixture further includes a rotation speed limiting mechanism for limiting the rotation speed of the suction cup 30, and the rotation speed limiting mechanism is electrically connected to the controller; the controller is configured to: when the detection value of the first pressure sensor 60 or the second pressure sensor 70 is greater than zero, control the rotation speed limiting mechanism to perform a first deceleration on the suction cup 30; when the detection values of both the first pressure sensor 60 and the second pressure sensor 70 are greater than zero, control the rotation speed limiting mechanism to perform a second deceleration on the suction cup 30; when the difference between the detection values of the first pressure sensor 60 and the second pressure sensor 70 is less than a threshold value A, and the detection value of the fifth pressure sensor 200 is greater than zero, control the first driving mechanism 401 to stop advancing, and at the same time control the rotation speed limiting mechanism to lock the suction cup 30 (if only the first pressure sensor 60 and the second pressure sensor 70 are provided on the first pushing surface 240, when the detection value difference is less than the threshold value A, control the first driving mechanism 401 to stop advancing, and at the same time control the rotation speed limiting mechanism to lock the suction cup 30). It can be understood that when the detection value of the first pressure sensor 60 or the second pressure sensor 70 > 0, it indicates that the edge of the touch screen 10 has started to contact the fixture. At this time, if the rotation speed of the suction cup 30 is too fast, edge stress concentration may be caused by instantaneous friction. Triggering the first deceleration can reduce the risk of edge abrasion or fragmentation. When the detection values of both the first pressure sensor 60 and the second pressure sensor 70 are > 0, it means that both edges of the touch screen 10 have completely contacted the first flexible plate 404. At this time, if the rotation speed is too large, the overall screen may slide or twist due to uneven friction. Triggering the second deceleration can prevent the internal circuit from being pulled and broken. When the detection value of the fifth pressure sensor 200 > 0, and the difference between the detection values of the first pressure sensor 60 and the second pressure sensor 70 is less than the threshold value A, it indicates that the touch screen 10 has reached the preset position in the first direction. At this time, stopping the advancement of the first direction adjustment assembly 40 can ensure the assembly accuracy and prevent screen warping caused by excessive extrusion. Locking the suction cup 30 through the rotation speed limiting mechanism can increase the adsorption reliability.

[0035] In some embodiments, the suction cup 30 includes: A disk body 301, the top surface of the disk body 301 is provided with a plurality of air extraction holes 3011, and an air suction cavity 3012 communicating with the air extraction holes 3011 is formed inside the disk body 301; An air extraction pipe 302, the air extraction pipe 302 includes a quick-release joint 3021 for connecting an external air extraction device, a rotating pipe 3023, and a fixed pipe 3022. The rotating pipe 3023 and the fixed pipe 3022 are connected through a rotating connector 270; the other end of the rotating pipe 3023 is connected to the disk body 301 (when the disk body 301 rotates, the rotating pipe 3023 rotates with the disk body 301), and the rotating pipe 3023 communicates with the air suction cavity 3012 inside the disk body 301; the quick-release joint 3021 is connected to the other end of the fixed pipe 3022; The connecting plate 100 is fixed below the support plate 20, and the rotary connecting piece 270 is connected to the connecting plate 100.

[0036] In some embodiments, the rotary connecting piece 270 is a coupling or a rotary joint.

[0037] In some embodiments, the rotational speed limiting mechanism includes: an electromagnet 110 fixedly connected to the bottom surface of the support plate 20, and the electromagnet 110 is electrically connected to the controller; a connecting pipe body 120, one end of which is fixedly connected to the bottom of the disk body 301, sleeved on the outside of the air extraction pipe 302, and extends in a direction away from the disk body 301; a synchronous rotating member 130 sleeved on the connecting pipe body 120 and rotating synchronously with the disk body 301; a permanent magnet 140 located between the electromagnet 110 and the synchronous rotating member 130; an elastic member 150, one end of which is connected to the permanent magnet 140 and the other end is connected to the electromagnet 110; when the electromagnet 110 is energized, a magnetic field opposite to that of the permanent magnet 140 is generated, driving the permanent magnet 140 to move towards the synchronous rotating member 130, so that a frictional resistance is generated between the permanent magnet 140 and the synchronous rotating member 130 to limit the rotational speed of the suction cup 30. It can be understood that the connection between the synchronous rotating member 130 and the connecting pipe body 120 is a fixed connection and rotates synchronously with the disk body 301; the elastic member 150 is used to provide a restoring force for the permanent magnet 140 to separate the permanent magnet 140 from the synchronous rotating member 130 when powered off, avoiding continuous braking loss. And the controller can be configured such that the rotational speed limiting mechanism responds only after the first direction adjustment assembly 40 is driven to work, so as to reduce standby energy consumption. The working principle of the rotational speed limiting mechanism for rotational speed control is as follows: ① In the initial state (not energized): The electromagnet 110 has no magnetic field, and the permanent magnet 140 maintains an initial distance from the synchronous rotating member 130 under the action of the elastic member 150, and the two are not in contact, and the synchronous rotating member 130 can freely rotate with the suction cup 30; ② In the energized braking state: After the electromagnet 110 is energized, a magnetic field opposite to that of the permanent magnet 140 is generated, and the like-sex repulsion causes the permanent magnet 140 to overcome the resistance of the elastic member 150 and move towards the synchronous rotating member 130 until the two are in contact; after the permanent magnet 140 is in contact with the synchronous rotating member 130, the rotational speed of the synchronous rotating member 130 is limited by the frictional resistance, and then the rotational speed of the suction cup 30 is limited.

[0038] The rotational speed limiting mechanism in this application is based on "electromagnetic force-driven friction braking". The magnetic field strength can be adjusted by current, enabling linearly adjustable frictional resistance, thereby changing the normal pressure of the permanent magnet 140 on the synchronous rotating part 130 and achieving a continuously variable braking effect. Specifically: ① First deceleration (triggered by a single pressure sensor): When the detected value of either the first pressure sensor 60 or the second pressure sensor 70 is greater than zero, a low current is passed through the electromagnet 110 to generate a weak magnetic field. The permanent magnet 140 lightly touches the synchronous rotating part 130 to provide a small braking force (for example, the rotational speed drops from 300 rpm to 150 rpm), avoiding sudden stop shocks. ② Second deceleration (triggered by dual pressure sensors): When the detected values of both the first pressure sensor 60 and the second pressure sensor 70 are greater than zero, a high current is passed through, the magnetic field is enhanced, and the permanent magnet 140 slightly presses against the synchronous rotating part 130, increasing the braking force (for example, the rotational speed drops from 150 rpm to 50 rpm). ③ Locking (triggered by dual pressure sensors or triple pressure sensors): In the case of dual pressure sensor triggering, it means that when the difference between the detected values of the first pressure sensor 60 and the second pressure sensor 70 is less than threshold A, a higher current is passed through, the magnetic field is further enhanced, the permanent magnet 140 further presses against the synchronous rotating part 130, increasing the braking force to magnetically lock the suction cup 30; in the case of triple pressure sensor triggering, it means that when the difference between the detected values of the first pressure sensor 60 and the second pressure sensor 70 is less than threshold A and the detected value of the fifth pressure sensor 200 is greater than zero, a higher current is passed through, the magnetic field is further enhanced, the permanent magnet 140 presses against the synchronous rotating part 130, increasing the braking force to magnetically lock the suction cup 30; before processing the touch screen 10, the controller can control the first driving mechanism 401 to drive the first pushing member to reset to the zero position, and the second driving mechanism 501 to drive the second pushing member to reset to the zero position, avoiding the processing space limitation caused by the first push plate 403 and the second push plate 503.

[0039] This rotational speed limiting mechanism makes the braking process smoother and the rotational speed fluctuation smaller through a hierarchical deceleration mechanism. The soft contact characteristic of magnetic force braking can greatly reduce the impact stress, reduce the damage to the touch screen 10, and improve the product yield. Through the collaborative design of electromagnetics and mechanics, this rotational speed limiting mechanism has achieved a technological breakthrough of "precise braking, low-loss durability, and flexible adaptation", significantly improving the stability and production efficiency of the touch screen 10 assembly process. Moreover, due to the dual safety redundancy of the deceleration control of the rotational speed limiting mechanism and the first flexible plate 404 on the touch screen 10, the moving speed of the first driving mechanism 401 before contacting the touch screen 10 can be increased, thereby further shortening the adjustment and positioning time.

[0040] In some embodiments, the rotational speed limiting mechanism further includes a guiding column 190 for guiding the permanent magnet 140. One end of the guiding column 190 is connected to the electromagnet 110, and the other end of the guiding column 190 is connected to the connecting plate 100. The permanent magnet 140 is slidably sleeved on the guiding column 190. It can be understood that the guiding column 190 provides a unique movement path for the permanent magnet 140 through mechanical limitation, ensuring that it moves only along the axial direction (perpendicular to the rotation plane of the suction cup 30) under the action of electromagnetic force and elastic force, avoiding radial offset or tilt; providing a mechanical reference for electromagnetic braking, converting non-contact control into quantifiable contact braking; by restricting the movement trajectory, simplifying the complex spatial force into a single axial force, and reducing the failure risk caused by multi-variable coupling.

[0041] In some embodiments, the number of the guiding columns 190 is 2 - 6. It can be understood that when the number of the guiding columns 190 ≥ 2, through two-point limitation, a good limiting effect can be formed on the permanent magnet 140, and the permanent magnet 140 can be prevented from deflecting under the action of frictional resistance when generating frictional resistance with the synchronous rotating member 130.

[0042] In some embodiments, it further includes a sleeve 220 sleeved outside the guiding column 190. The elastic member 150 is a spring, and the spring is sleeved on the sleeve 220. The top of the sleeve 220 is connected to the electromagnet 110.

[0043] In some embodiments, the support plate 20 is provided with a mounting hole 201, and the connecting pipe body 120 penetrates through the mounting hole 201. An interference fit or key connection is adopted between the synchronous rotating member 130 and the connecting pipe body 120 to ensure synchronous rotation. The elastic member 150 is a spring or an elastic rubber member, and is used to reset the permanent magnet 140 when the electromagnet 110 is powered off. Friction material layers for enhancing the braking effect are provided on the contact surfaces between the permanent magnet 140 and the synchronous rotating member 130.

[0044] In some embodiments, the fixture further includes a rotational speed detection mechanism for detecting the rotational speed of the suction cup 30; the rotational speed detection mechanism includes: an optical signal generating unit 160 for generating a detection optical signal; an optical signal receiving unit 170 for receiving the detection optical signal; a grating 180 disposed at the bottom of the synchronous rotating member 130; the grating 180 is disposed on the optical path between the optical signal generating unit 160 and the optical signal receiving unit 170; the optical signal generating unit 160 and the optical signal receiving unit 170 are respectively electrically connected to the controller; when the synchronous rotating member 130 rotates following the suction cup 30, the grating 180 periodically modulates the detection optical signal, and the optical signal receiving unit 170 determines the rotational speed of the suction cup 30 according to the modulation frequency of the detection optical signal. It can be understood that this rotational speed detection mechanism realizes non-contact rotational speed measurement based on the optical intensity modulation principle. The combination of this rotational speed detection mechanism and the rotational speed limiting mechanism can form a closed-loop control. For example, the controller is configured such that when the controller detects that the deviation between the actual rotational speed and the target value > ±0.5 rpm, it dynamically adjusts the current of the electromagnet 110 to quickly converge the rotational speed to the set value (such as the second deceleration target of 50 rpm and the stabilization time < 50 ms). Moreover, the controller can be configured such that after the first-direction adjustment assembly 40 is driven to work, the rotational speed limiting mechanism and the rotational speed detection mechanism respond only to reduce standby energy consumption; when the first-direction adjustment assembly 40 and the second-direction adjustment assembly 50 return to the initial position, the rotational speed limiting mechanism and the rotational speed detection mechanism are in a shutdown state.

[0045] In some embodiments, the grating 180 is a reflective grating, and the optical signal generating unit 160 and the optical signal receiving unit 170 are located on the same side of the synchronous rotating member 130; or, the grating 180 is a transmissive grating, and the optical signal generating unit 160 and the optical signal receiving unit 170 are respectively located on both sides of the synchronous rotating member 130; or, the grating 180 is a linearly distributed grating with equal spacing or a radially distributed grating. It can be understood that for the selection of the type of the grating 180, a single selection or a combined selection can be made according to the accuracy requirements.

[0046] In this embodiment, the grating 180 is a linearly distributed grating with equal spacing. The optical signal generating unit 160 is disposed on the connecting plate 100, and the optical signal receiving unit 170 is disposed on the guide post 190; there is an included angle between the optical path between the optical signal generating unit 160 and the optical signal receiving unit 170 and the horizontal plane, and the included angle is 30° - 60°. Designing the optical path as an inclined angle can avoid interference between the optical signal generating unit 160 and the optical signal receiving unit 170 and other components (such as the permanent magnet 140 and the elastic member 150). It can improve the reliability of detection and at the same time improve the overall compactness of the fixture.

[0047] In some embodiments, the operating power of the electromagnet 110 has a linear relationship with the rotational speed of the suction cup 30.

[0048] In some embodiments, the first driving mechanism 401 and the second driving mechanism 501 are ball screw modules driven by servo motors. It can be understood that the ball screw module driven by a servo motor can achieve high-precision linear driving, which is beneficial to controlling the position adjustment of the touch screen 10.

[0049] In some embodiments, the connecting plate 100 is connected to the lower side of the support plate 20 through the mounting housing 230. The outer shape of the lower end of the mounting housing 230 is adapted to the outer shape of the connecting plate 100. An installation space is formed between the connecting plate 100 and the mounting housing 230. Both the rotational speed limiting mechanism and the rotational speed detection mechanism are installed in the installation space. It can be understood that the cross-sectional shape of the mounting housing 230 can be circular or rectangular. The shape of the mounting housing 230 is not limited by this application as long as an installation space for accommodating the rotational speed limiting mechanism and the rotational speed detection mechanism can be formed between the mounting housing 230 and the connecting plate 100.

[0050] Please refer to Figure 11 , in some embodiments, the fixture for touch screen processing further includes an operating table 260, and the support plate 20 is installed on the operating table 260.

[0051] In some embodiments, the controller is a PLC.

[0052] Please refer to Figures 9 - 10 , when only the first pressure sensor 60, the second pressure sensor 70, the third pressure sensor 80, and the fourth pressure sensor 90 are provided, the working process of clamping the touch screen 10 with the fixture for touch screen processing in this application is as follows: S1. Drive the first push member of the first driving mechanism 401 to return to the zero position, and drive the second push member of the second driving mechanism 501 to return to the zero position; S2. Adsorb the touch screen 10 on the suction cup 30, and the initial position is as shown in Figure 9 (a); S3. As shown in Figure 9 (b), the first driving mechanism 401 drives the first push rod 402 to extend along the direction of arrow b. When the detected value of the first pressure sensor 60 is greater than zero (that is, the first pressure sensor 60 on the first flexible plate 404 contacts the first side surface 101 of the touch screen 10), the controller controls the suction cup 30 to decelerate for the first time; the first driving mechanism 401 drives the first push rod 402 to continue to extend along the direction of arrow b, and the first flexible plate 404 pushes the touch screen 10 to rotate along the direction of arrow a; S4. The first driving mechanism 401 drives the first push rod 402 to continue to extend along the direction of arrow b. The first flexible plate 404 pushes the touch screen 10 to continue to rotate along the direction of arrow a. When the detected value of the second pressure sensor 70 is greater than zero (i.e., the second pressure sensor 70 on the first flexible plate 404 contacts the first side surface 101 of the touch screen 10), the controller controls the suction cup 30 to decelerate for the second time. The first driving mechanism 401 drives the first push rod 402 to continue to extend along the direction of arrow b. When the difference between the detected values of the first pressure sensor 60 and the second pressure sensor 70 is less than the threshold A, the controller controls the first driving mechanism 401 to stop advancing, and at the same time controls the speed limiting mechanism to lock the suction cup 30, completing the position adjustment in the first direction. The extended length of the first push rod 402 can be obtained, as Figure 10 shown in (a); S5. The second driving mechanism 501 drives the second push rod 502 to extend along the direction of arrow c in Figure 10 (a). When the difference between the detected values of the third pressure sensor 80 and the fourth pressure sensor 90 on the second flexible plate 504 is less than the threshold B, the controller controls the second driving mechanism 501 to stop advancing. The extended length of the second push rod 502 can be obtained, completing the positioning of the touch screen 10, as Figure 10 shown in (b); Finally, by combining the extended lengths of the first push rod 402 and the second push rod 502 and calculating the assembly position coordinates of the touch screen 10, the position of the touch screen 10 on the fixture can be accurately obtained.

[0053] Please refer to Figures 18 - 20 , when continuing to add the fifth pressure sensor 200 and the sixth pressure sensor 210, the working process of clamping the touch screen 10 by using the fixture for processing the touch screen in the present application is as follows: S1. The first driving mechanism 401 drives the first pushing member to reset to the zero position, and the second driving mechanism 501 drives the second pushing member to reset to the zero position; S2. Adsorb the touch screen 10 on the suction cup 30, and the initial position is as Figure 18 shown in (a); S3. As Figure 18 shown in (b), the first driving mechanism 401 drives the first push rod 402 to extend along the direction of arrow b. When the detected value of the first pressure sensor 60 is greater than zero (i.e., the first pressure sensor 60 on the first flexible plate 404 contacts the first side surface 101 of the touch screen 10), the controller controls the suction cup 30 to decelerate for the first time. The first driving mechanism 401 drives the first push rod 402 to continue to extend, and the first flexible plate 404 pushes the touch screen 10 to rotate along the direction of arrow a; S4. The first driving mechanism 401 drives the first push rod 402 to continue to extend along the direction of arrow b, as Figure 19As shown in (a), the first flexible plate 404 pushes the touch screen 10 to continue rotating in the direction of arrow a. When the detected value of the second pressure sensor 70 is greater than zero (i.e., the second pressure sensor 70 on the first flexible plate 404 contacts the first side 101 of the touch screen 10), the controller controls the suction cup 30 to decelerate for the second time; the first driving mechanism 401 drives the first push rod 402 to continue extending in the direction of arrow b until the difference between the detected values of the first pressure sensor 60 and the second pressure sensor 70 is less than the threshold A. At this time, the first driving mechanism 401 drives the first push rod 402 to continue extending in the direction of arrow b until the detected value of the fifth pressure sensor 200 is greater than zero. Then the controller controls the first driving mechanism 401 to stop advancing and simultaneously controls the rotational speed limiting mechanism to lock the suction cup 30, completing the position adjustment in the first direction. The extended length of the first push rod 402 can be obtained, as shown in Figure 19 (b); S5. As shown in Figure 20 (a), the second driving mechanism 501 drives the second push rod 502 to extend in the direction of arrow c until the difference between the detected values of the third pressure sensor 80 and the fourth pressure sensor 90 on the second flexible plate 504 is less than the threshold B. At this time, the second driving mechanism 501 drives the second push rod 502 to continue extending in the direction of arrow c until the detected value of the sixth pressure sensor 210 is greater than zero. Then the controller controls the second driving mechanism 501 to stop advancing. The extended length of the second push rod 502 can be obtained, completing the positioning of the touch screen 10, as shown in Figure 20 (b); Finally, by combining the final extended lengths of the first push rod 402 and the second push rod 502 and calculating the assembly position coordinates of the touch screen 10, the position of the touch screen 10 on the fixture can be accurately obtained.

Claims

1. A fixture for touch screen processing, used to fix a touch screen having a first side and a second side perpendicular to each other, comprising a support plate and a suction cup disposed on the support plate for fixing the touch screen, characterized in that, It further includes a first-direction adjustment component, a second-direction adjustment component, and a controller; wherein, The suction cup is rotatably connected to the support plate; The first-direction adjustment component includes a first driving mechanism and a first pushing member connected to the first driving mechanism. The first pushing member has a first pushing surface for pushing the first side surface of the touch screen. A first pressure sensor and a second pressure sensor are provided on the first pushing surface; The second-direction adjustment component includes a second driving mechanism and a second pushing member connected to the second driving mechanism. The second pushing member has a second pushing surface for pushing the second side surface of the touch screen. A third pressure sensor and a fourth pressure sensor are provided on the second pushing surface; The pushing directions of the first pushing member and the second pushing member are perpendicular to each other, and the heights of the first pushing member and the second pushing member are both matched with the installation height when the touch screen is adsorbed on the suction cup; The first pressure sensor, the second pressure sensor, the third pressure sensor, and the fourth pressure sensor are respectively electrically connected to the controller.

2. The jig for touch screen processing according to claim 1, wherein, The first pushing member includes a first push rod and a first push plate. One end of the first push rod is connected to the first driving mechanism, and the other end of the first push rod is connected to the first push plate. A first flexible plate with a first pushing surface is provided on the first push plate; The second pushing member includes a second push rod and a second push plate. One end of the second push rod is connected to the second driving mechanism, and the other end of the second push rod is connected to the second push plate. A second flexible plate with a second pushing surface is provided on the second push plate.

3. The jig for touch screen processing according to claim 2, wherein, The fixture further includes a fifth pressure sensor; both sides of the first flexible plate are inclined towards the suction cup; the first pressure sensor and the second pressure sensor are symmetrically arranged in the edge areas on both sides of the first flexible plate. The fifth pressure sensor is provided on the first pushing surface and is located in the middle of the first flexible plate. The fifth pressure sensor is electrically connected to the controller; and / or, The fixture further includes a sixth pressure sensor; both sides of the second flexible plate are inclined towards the suction cup; the third pressure sensor and the fourth pressure sensor are symmetrically arranged in the edge areas on both sides of the second flexible plate; the sixth pressure sensor is provided on the second pushing surface and is located in the middle of the second flexible plate. The sixth pressure sensor is electrically connected to the controller.

4. The fixture for touch screen processing according to claim 3, wherein, The first pressure sensor and the second pressure sensor are at the same installation height, and the detection center points of the first pressure sensor and the second pressure sensor respectively align with the two side edges of the first side surface of the touch screen; and / or, the third pressure sensor and the fourth pressure sensor are at the same installation height, and the detection center points of the third pressure sensor and the fourth pressure sensor respectively align with the two side edges of the second side surface of the touch screen; and / or, the midpoint of the connection line between the first pressure sensor and the second pressure sensor coincides with the geometric center of the first side surface of the touch screen; and / or, the midpoint of the connection line between the third pressure sensor and the fourth pressure sensor coincides with the geometric center of the second side surface of the touch screen; And / or, on the first side of the touch screen, the length of the line connecting the positions aligned with the detection centers of the first pressure sensor and the second pressure sensor is 80%-95% of the length of the first side of the touch screen; And / or, on the second side of the touch screen, the length of the line connecting the positions aligned with the detection centers of the third pressure sensor and the fourth pressure sensor is 80%-95% of the length of the second side of the touch screen; And / or, the first flexible plate includes a first intermediate plate and two first wing plates symmetrically connected to both sides of the first intermediate plate, and the outer edges of the two first wing plates are inclined towards the suction cup; the first pressure sensor and the second pressure sensor are respectively located on the two first wing plates, and the fifth pressure sensor is located on the first intermediate plate; And / or, the second flexible plate includes a second intermediate plate and two second wing plates symmetrically connected to both sides of the second intermediate plate, and the outer edges of the two second wing plates are inclined towards the suction cup; the third pressure sensor and the fourth pressure sensor are respectively located on the two second wing plates, and the sixth pressure sensor is located on the second intermediate plate.

5. The fixture for touch screen processing according to claim 4, wherein, The fifth pressure sensor is located on the line connecting the first pressure sensor and the second pressure sensor; the fifth pressure sensor has the same installation height as the first pressure sensor and the second pressure sensor; And / or, the sixth pressure sensor has the same installation height as the third pressure sensor and the fourth pressure sensor; And / or, the detection center of the fifth pressure sensor is aligned with the geometric center of the first side of the touch screen; And / or, the detection center of the sixth pressure sensor is aligned with the geometric center of the second side of the touch screen; And / or, the first wing plate is a rectangular plate or an arc-shaped plate; And / or, the second wing plate is a rectangular plate or an arc-shaped plate.

6. The fixture for touch screen processing according to claim 5, wherein, The suction cup includes: A disk body, the top surface of which is provided with a plurality of air extraction holes, and an air suction cavity communicating with the air extraction holes is formed inside; An air extraction pipe, which includes a quick-release joint for connecting an external air extraction device, a rotating pipe and a fixed pipe, and the rotating pipe and the fixed pipe are connected by a rotating connector; the other end of the rotating pipe is connected to the disk body, and the rotating pipe communicates with the air suction cavity inside the disk body; the quick-release joint is connected to the other end of the fixed pipe; A connecting plate, fixed below the support plate, and the rotating connector is connected to the connecting plate.

7. The fixture for touch screen processing according to claim 6, characterized in that, The fixture further includes a rotation speed limiting mechanism for limiting the rotation speed of the suction cup, and the rotation speed limiting mechanism is electrically connected to the controller.

8. The jig for touch screen processing according to claim 7, wherein, The rotation speed limiting mechanism includes: An electromagnet, fixedly connected to the bottom surface of the support plate and electrically connected to the controller; A connecting pipe body, one end of which is fixedly connected to the bottom of the disk body and sleeved outside the air extraction pipe, and extends in a direction away from the disk body; A synchronous rotating member, sleeved on the connecting pipe body and rotating synchronously with the disk body; A permanent magnet, located between the electromagnet and the synchronous rotating member; An elastic member, one end of which is connected to the permanent magnet and the other end is connected to the electromagnet; Wherein, when the electromagnet is energized, a magnetic field opposite to that of the permanent magnet is generated, driving the permanent magnet to move towards the synchronous rotating member, so that a frictional resistance is generated between the permanent magnet and the synchronous rotating member to limit the rotation speed of the disk body.

9. The jig for touch screen processing according to claim 8, wherein, The fixture further includes a rotational speed detection mechanism for detecting the rotational speed of the suction cup; the rotational speed detection mechanism includes: an optical signal generating unit for generating a detection optical signal; an optical signal receiving unit for receiving the detection optical signal; a grating disposed at the bottom of the synchronous rotating member; wherein the grating is disposed on the optical path between the optical signal generating unit and the optical signal receiving unit; the optical signal generating unit and the optical signal receiving unit are respectively electrically connected to a controller; when the synchronous rotating member rotates following the suction cup, the grating periodically modulates the detection optical signal, and the optical signal receiving unit determines the rotational speed of the suction cup according to the modulation frequency of the detection optical signal.

10. The jig for touch screen processing according to claim 9, wherein, The rotational speed limiting mechanism further includes a guide post for guiding the permanent magnet, one end of the guide post is connected to the electromagnet, the other end of the guide shaft is connected to the connecting plate, and the permanent magnet is slidably sleeved on the guide post; and / or, the elastic member is a spring or an elastic rubber member for resetting the permanent magnet when the electromagnet is powered off; and / or, a friction material layer for enhancing the braking effect is provided on the contact surface between the permanent magnet and the synchronous rotating member; and / or, the grating is a reflective grating, and the optical signal generating unit and the optical signal receiving unit are located on the same side of the synchronous rotating member; and / or, the grating is a transmissive grating, and the optical signal generating unit and the optical signal receiving unit are respectively located on both sides of the synchronous rotating member; and / or, the grating is a linear grating with equally spaced distribution or a radially distributed grating; and / or, the operating power of the electromagnet has a linear relationship with the rotational speed of the suction cup; and / or, the first driving mechanism and the second driving mechanism are ball screw modules driven by servo motors; and / or, the controller is a PLC.

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