Intelligent pressure maintaining clamp for tablet personal computer

Abstract

The invention discloses an intelligent pressure maintaining clamp for a tablet personal computer, and relates to the technical field of production and manufacturing of the tablet personal computer, the intelligent pressure maintaining clamp comprises a plurality of double-layer pressing plates, a first bottom plate, a second top plate, four guide columns, an electric push cylinder and a plurality of two-fold herringbone curved hands, the lower ends of the four guide columns are vertically and fixedly installed at the four corners of the first bottom plate respectively; the multiple double-layer pressing plates are installed above the first bottom plate in a lifting mode, the second top plate is installed above the multiple double-layer pressing plates in a lifting mode, and the two ends of the multiple two-fold herringbone curved hands are hinged to the side faces of the two double-layer pressing plates, the side faces of the double-layer pressing plates and the first bottom plate or the side faces of the double-layer pressing plates and the second top plate respectively; through the design of the multiple double-layer pressing plates, the clamp can conduct pressure maintaining operation on multiple tablet personal computers or screen assemblies at the same time, the production speed is greatly increased, the yield is greatly increased, and the adaptability of the clamp is greatly improved through the arrangement of the micro telescopic push rods.

Description

Technical Field

[0001] The present invention relates to the technical field of tablet computer production and manufacturing, and in particular to an intelligent pressure-maintaining fixture for a tablet computer. Background Art

[0002] In the field of tablet computer manufacturing, the diversity and rapid replacement of products have put forward higher requirements for pressure holding fixtures. There are large differences in size, thickness, and appearance design between different models of tablet computers. This requires the pressure holding fixture to have strong adaptability to meet the production needs of various specifications of tablet computers. With the intensification of market competition, manufacturers need to continuously improve production efficiency and product quality while reducing production costs. As an important tool in the production process of tablet computers, the adaptability of the pressure holding fixture directly affects the smooth progress of production and the competitiveness of the enterprise. If the pressure holding fixture can only adapt to a single model of tablet computers, then when facing different products, the enterprise needs to frequently replace the fixture, which will not only increase the equipment investment cost, but also reduce production efficiency and affect the delivery time of the product. In addition, the production process of tablet computers is also constantly developing and improving, which requires the pressure holding fixture to keep up with the changes in the process and adapt to new production requirements. For example, with the continuous advancement of tablet computer screen technology, the thickness and hardness of the screen may change, which requires the pressure holding fixture to adjust the clamping force and support method to ensure that the screen is not damaged during the assembly process.

[0003] In summary, in order to meet the diversified needs of tablet computer production, improve production efficiency and product quality, and reduce production costs, the pressure holding fixture must have strong adaptability. However, the pressure holding fixture in the prior art is mainly composed of two clamping plates in an open and closed state, with a simple structure. It can only hold and clamp one tablet computer or screen assembly at a time, and the support gap between the two clamping plates cannot be automatically adjusted, resulting in low production efficiency and poor adaptability. In view of this, this paper proposes an intelligent pressure holding fixture for tablet computers. Summary of the invention

[0004] The main purpose of the present invention is to provide an intelligent pressure-maintaining fixture for a tablet computer, which can effectively solve the problems in the background technology.

[0005] To achieve the above object, the technical solution adopted by the present invention is: An intelligent pressure-maintaining fixture for a tablet computer, comprising a plurality of double-layered plates, a first bottom plate, a second top plate, four guide columns, an electric push cylinder and a plurality of two-fold herringbone curved arms, wherein the double-layered plates are mainly composed of a second bottom plate and a first top plate which are parallel to each other, and the second bottom plate is fixedly installed above the first top plate; The lower ends of the four guide columns are respectively vertically fixedly installed at the four corners of the first bottom plate, several double-layer plywoods are installed above the first bottom plate by means of four guide columns for layered lifting and lowering, and the second top plate is installed above several double-layer plywoods by means of four guide columns for layered lifting and lowering, and the two ends of several two-fold herringbone arms are respectively hinged on the side surfaces of the two double-layer plywoods, the side surfaces of the double-layer plywoods and the first bottom plate, or the side surfaces of the double-layer plywoods and the second top plate, and the rotation angle range is 15°-165°, and a connecting frame is fixedly installed on the top ends of the four guide columns, and the electric push cylinder is fixedly installed on the connecting frame, and the first push rod in the electric push cylinder is vertically facing downward and connected to the second top plate, and micro-telescopic push rods are vertically installed on both side end surfaces of several second bottom plates and the first bottom plates, and fixed blocks are installed on both side end surfaces of several first top plates and the second top plates, and several micro-telescopic push rods and several fixed blocks are all in the same vertical plane.

[0006] Preferably, the second bottom plate includes an explosion-proof box and a first airbag rubber sheet, the lower opening of the explosion-proof box is sealed with a cover plate, the upper surface of the explosion-proof box is provided with a groove, the inner bottom surface of the groove is provided with a plurality of air holes that are interconnected with the inner cavity of the explosion-proof box, the first airbag rubber sheet is arranged parallel to the inner bottom surface of the groove, one side of the explosion-proof box is fixedly connected with a first air pipe and a second air pipe, a gas pressure sensor is fixedly installed at the end of the first air pipe, a two-position three-way solenoid valve is fixedly installed at the end of the second air pipe, and an air inlet of the two-position three-way solenoid valve is connected to a high-pressure gas storage tank through a conduit.

[0007] Preferably, a centralized control box is fixedly installed below the first base plate, a programmable controller is fixedly installed in the centralized control box, and the gas pressure sensor, the two-position three-way solenoid valve, and a plurality of the miniature telescopic push rods are respectively connected to the programmable controller via wires.

[0008] Preferably, a second pressure sensor is fixedly mounted on the lower surface of the fixed block, a first pressure sensor is fixedly connected between the first push rod and the second top plate in the electric push cylinder, and the first pressure sensor and several second pressure sensors are respectively connected to the programmable controller through wires.

[0009] Preferably, an outer frame is fixedly installed on the periphery of the explosion-proof box, and the gas pressure sensor and the two-position three-way solenoid valve are fixedly connected to the outer frame.

[0010] Preferably, a connection frame is fixedly installed on the outer ring of the first airbag rubber sheet, and the connection frame is fixedly installed on the outer ring of the groove in an embedded manner.

[0011] Preferably, first guide holes for connecting guide posts are provided at the four corners of the outer frame, and first turning holes for connecting two-fold herringbone arms are provided on both side end faces of the outer frame.

[0012] Preferably, a porous sponge plate is fitted on the inner bottom surface of the groove, and the lower surface of the first airbag rubber sheet and the upper surface of the porous sponge plate are in contact and fit with each other.

[0013] Preferably, the first top plate is mainly composed of a rectangular plate, and a buffer pad is fixedly installed on the lower bottom surface of the rectangular plate.

[0014] Preferably, second guide holes for connecting guide posts are arranged at the four corners of the rectangular plate, and second turning holes for connecting two-fold herringbone arms are arranged on both side end faces of the rectangular plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. Improve production efficiency The design of multiple double-layer pressing plates enables the fixture to perform pressure-holding operations on multiple tablet computers or screen assemblies at the same time, greatly improving the production speed and output. In the case of large-scale production, this efficient pressure-holding method can significantly shorten the production cycle and improve the company's market competitiveness. In addition, the cooperation of the electric push cylinder and the two-fold herringbone curved arm can quickly expand and close the double-layer pressing plates, facilitating the placement and removal of tablet computers, reducing operation time, and further improving production efficiency.

[0016] The sleeve proposed in Example 2 can reduce the friction required for several double-layered plates and the second top plate to be lifted and lowered along the four guide columns. By installing the sleeve in the first guide hole or the second guide hole, the original sliding friction is converted into rolling friction, and the friction is significantly reduced, which makes the lifting and lowering of the double-layered plates and the second top plate smoother, greatly shortening the loading and unloading time of the tablet computer or screen assembly in the fixture. In the case of large-scale production or frequent operation, the time wasted due to operation jams is reduced, thereby improving the overall production efficiency. At the same time, the degree of wear on the outer wall of the guide column and the inner wall of the guide hole is reduced, the service life of the equipment is extended, and the equipment maintenance cost is reduced.

[0017] 2. Strong adaptability The setting of the micro-telescopic push rod greatly improves the adaptability of the clamp. Different models of tablet computers or screen assemblies often have different thicknesses, and the micro-telescopic push rod in the clamp can be flexibly adjusted according to these different thicknesses. By adjusting the extension length of the second push rod in the micro-telescopic push rod, the spacing between the first bottom plate and the upper double-layer plate, between the two double-layer plates, and between the uppermost double-layer plate and the second top plate can be precisely controlled to adapt to tablet computers or screen assemblies of different thicknesses.

[0018] The second pressure sensors on several fixed blocks can also detect the pressure between the parts to verify again whether the clamping force is appropriate. This strong adaptability enables the clamp to be widely used in the clamping and pressure maintenance of tablet computers or screen assemblies of various specifications, greatly improving the versatility of the clamp and reducing the cost and time of replacing the clamp due to equipment mismatch.

[0019] 3. Stable clamping The first airbag rubber sheet is one of the key components for achieving stable clamping. It is deformable and can change according to the shape of the tablet computer shell. When the tablet computer is placed in the clamp, the compressed gas filled in the explosion-proof box causes the first airbag rubber sheet to expand and lift up. Due to its deformability, the expanded first airbag rubber sheet can fit closely to the shape of the tablet computer shell, and good contact can be achieved regardless of whether it is a flat part or a part with a slight curvature or protrusion.

[0020] At the same time, the buffer pad fixedly installed on the lower bottom surface of the first top plate also plays an important role. When the first airbag rubber sheet presses the tablet computer screen against the buffer pad, the buffer pad can play a buffering role, reduce the impact force on the tablet computer during the clamping process, and further enhance the stability of the clamping; this stable clamping method can effectively reduce the shaking of the tablet computer during the clamping process, avoid collision or wear caused by shaking, and provide double protection for the safety of the tablet computer.

[0021] 4. Uniform support and enhanced stability In Example 3, the first airbag rubber sheet is designed to be divided into several second rubber sheets. The grid design allows the pressure to be dispersed into each small grid. When subjected to external force, each small area can bear a part of the force, thereby achieving more uniform support. Compared with the first airbag rubber sheet designed as a whole sheet, the grid design can avoid the situation where some parts have larger deformations while other parts have smaller deformations, thereby improving the uniformity of the supporting force.

[0022] The support plate fixedly installed on the upper surface of each second rubber sheet further enhances the support effect, making the tablet computer more stable in the clamp, reducing the risk of shaking and collision, and providing better protection for the tablet computer.

[0023] 5. Intelligent pressure maintenance The intelligent pressure-maintaining fixture for the tablet computer realizes a highly intelligent pressure-maintaining function through the close cooperation of the gas pressure sensor, programmable controller and two-position three-way solenoid valve; the gas pressure sensor can accurately monitor the air pressure in the inner cavity of the explosion-proof box in real time. Since the inner cavity of the explosion-proof box is connected to the first airbag rubber sheet, according to Pascal's law, the squeezing force exerted on the first airbag rubber sheet can be accurately determined, and then the pressure exerted on the tablet computer can be known.

[0024] As the core control unit, the programmable controller receives pressure data from the gas pressure sensor. When the detected air pressure is less than the preset clamping force, the controller will respond quickly and control the two-position three-way solenoid valve to perform inflation operation to increase the air pressure in the explosion-proof box, thereby increasing the clamping force of the first airbag rubber sheet on the tablet computer and ensuring that the tablet computer is stably clamped in the fixture. Conversely, when the detected air pressure is greater than the preset clamping force, the programmable controller will control the two-position three-way solenoid valve to exhaust air and reduce the air pressure in the explosion-proof box to prevent damage to the tablet computer due to excessive clamping force. This intelligent pressure maintenance function can always keep the clamping force of the tablet computer within an appropriate range, providing reliable protection for the tablet computer and greatly reducing the risk of damage to the tablet computer due to improper clamping during processing, transportation or storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ; Figure 3 It is a schematic diagram of the structure of the double-layered board in the present invention; Figure 4 is an exploded view of the double-layer laminate of the present invention; Figure 5 This is a schematic diagram of the structure of the first top plate in the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the structure of the first top plate in the present invention. Figure 2 ; Figure 7 is a schematic structural diagram of a sleeve in Embodiment 2 of the present invention; Figure 8 is an exploded view of the sleeve in Example 2 of the present invention; Fig. 9 The present invention Figure 8 A magnified view of a part in the middle; Fig.10 It is a schematic structural diagram of the second rubber sheet in Example 3 of the present invention.

[0026] In the figure: 1, control box; 2, first bottom plate; 3, double-layer plate; 31, second bottom plate; 3101, outer frame; 3102, first guide hole; 3103, micro telescopic push rod; 3104, cover plate; 3105, explosion-proof box; 3106, air hole; 3107, connecting frame; 3108, first airbag rubber sheet; 3109, first air pipe; 3110, second air pipe; 3111, two-position three-way solenoid valve; 3112, gas pressure sensor; 3113, first rotating hole; 3114, grid frame; 3115, second rubber sheet; 3116, support plate; 32, first top Plate; 3201, rectangular plate; 3202, second guide hole; 3203, second rotating hole; 3204, fixing block; 3205, buffer pad; 33, sleeve; 3301, first circular ring; 3302, second circular ring; 3303, positioning hole; 3304, bolt; 3305, pulley; 3306, first mounting hole; 3307, second mounting hole; 3308, first semicircular hole; 3309, second semicircular hole; 3310, cylinder 3310; 4, second top plate; 5, guide column; 6, connecting frame; 7, electric push cylinder; 8, two-fold herringbone hand; 9, first pressure sensor. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] Embodiment 1: like Figure 1-6 As shown, an intelligent pressure-holding clamp for a tablet computer includes a plurality of double-layer pressing plates 3. The double-layer pressing plates 3 are mainly composed of a second bottom plate 31 and a first top plate 32 which are parallel to each other. The second bottom plate 31 is fixedly installed above the first top plate 32. The multi-layer design can simultaneously hold and clamp multiple tablet computers or screen assemblies and other components.

[0029] refer to Figure 4The second bottom plate 31 includes an explosion-proof box 3105 and a first airbag rubber sheet 3108. An outer frame 3101 is fixedly installed on the periphery of the explosion-proof box 3105. A cover plate 3104 is sealed and fixedly installed on the lower opening of the explosion-proof box 3105. A groove is arranged on the upper surface of the explosion-proof box 3105. A plurality of air holes 3106 that are interconnected with the inner cavity of the explosion-proof box 3105 are arranged on the inner bottom surface of the groove. The first airbag rubber sheet 3108 is arranged parallel to the inner bottom surface of the groove. A connecting frame 3107 is fixedly installed on the outer ring of the first airbag rubber sheet 3108. The connecting frame 3107 is fixedly installed in the groove in an inlaid manner. On the outer ring, one side of the explosion-proof box 3105 is fixedly connected with a first air pipe 3109 and a second air pipe 3110, a gas pressure sensor 3112 is fixedly installed at the end of the first air pipe 3109, and a two-position three-way solenoid valve 3111 is fixedly installed at the end of the second air pipe 3110. The air inlet of the two-position three-way solenoid valve 3111 is connected to a high-pressure gas storage tank through a conduit, and the high-pressure gas storage tank is connected to an air compressor through a conduit. Compressed air can be added to the high-pressure gas storage tank by the air compressor, and the gas pressure sensor 3112 and the two-position three-way solenoid valve 3111 are fixedly connected to the outer frame 3101; The air inlet of the two-position three-way solenoid valve 3111 is fixedly connected to the air outlet of the high-pressure gas storage tank, the working port of the two-position three-way solenoid valve 3111 is fixedly connected to the second air pipe 3110, and the exhaust port of the two-position three-way solenoid valve 3111 is in an open state.

[0030] refer to Figure 5-6 The first top plate 32 is mainly composed of a rectangular plate 3201 , and a buffer pad 3205 is fixedly installed on the lower bottom surface of the rectangular plate 3201 .

[0031] refer to Figure 1-2The intelligent pressure-maintaining fixture for a tablet computer also includes a first bottom plate 2, a second top plate 4, four guide columns 5, an electric push cylinder 7 and a plurality of two-fold herringbone curved hands 8. The first bottom plate 2 and the second bottom plate 31 have the same parameters such as structure, shape, size, and the same purpose. The second top plate 4 also has the same parameters such as structure, shape, size, and the same purpose as the first top plate 32. The lower ends of the four guide columns 5 are respectively vertically fixedly installed at the four corners of the first bottom plate 2. A plurality of double-layer laminates 3 are installed above the first bottom plate 2 by means of four guide columns 5 for lifting and lowering in layers. The second top plate 4 is installed above the plurality of double-layer laminates 3 by means of four guide columns 5 for lifting and lowering in layers. The four corners of the outer frame 3101 are provided with first guide columns 5 for connecting the first guide columns 5. A guide hole 3102, a second guide hole 3202 for connecting the guide column 5 is set at the four corners of the rectangular plate 3201, and the two ends of a plurality of two-fold herringbone curved arms 8 are respectively hinged on the side surfaces of the two double-layer pressing plates 3, the side surfaces of the double-layer pressing plates 3 and the first bottom plate 2, or the side surfaces of the double-layer pressing plates 3 and the second top plate 4, and the range of the rotation angle is 15°-165°, that is, the two-fold herringbone curved arms 8 cannot be straightened, so as to avoid the two-fold herringbone curved arms 8 from having a dead point position and being unable to fold back and forth. The end surfaces of both sides of the outer frame 3101 are set with first rotating holes 3113 for connecting the two-fold herringbone curved arms 8, and the end surfaces of both sides of the rectangular plate 3201 are set with second rotating holes 3203 for connecting the two-fold herringbone curved arms 8; A connecting frame 6 is fixedly installed on the top of the four guide columns 5, and an electric push cylinder 7 is fixedly installed on the connecting frame 6. The first push rod in the electric push cylinder 7 faces vertically downward and is connected to the second top plate 4. Micro-telescopic push rods 3103 are vertically installed on both side end surfaces of several second bottom plates 31 and the first bottom plate 2. Fixed blocks 3204 are installed on both side end surfaces of several first top plates 32 and the second top plates 4. Several micro-telescopic push rods 3103 and several fixed blocks 3204 are all in the same vertical plane. A second pressure sensor is fixedly installed on the lower surface of the fixed block 3204. A first pressure sensor 9 is fixedly connected between the first push rod in the electric push cylinder 7 and the second top plate 4. The first pressure sensor 9 is mainly used to detect the clamping force between the first push rod in the electric push cylinder 7 and the second top plate 4.

[0032] It should be added that a porous sponge board is fitted on the inner bottom surface of the groove, and the lower surface of the first airbag rubber sheet 3108 and the upper surface of the porous sponge board are in contact and fit with each other. The present invention utilizes the softness and deformability of the porous sponge board, which can be deformed and fitted according to the outer wall of the rear shell of the tablet computer, and is mainly used to increase the softness of the first airbag rubber sheet 3108.

[0033] It is further supplemented that a central control box 1 is fixedly installed under the first base plate 2, and a programmable controller is fixedly installed in the central control box 1. The gas pressure sensor 3112, a two-position three-way solenoid valve 3111, a number of miniature telescopic push rods 3103, a first pressure sensor 9 and a number of second pressure sensors are respectively connected to the programmable controller through wires.

[0034] As can be seen from the above, the inner cavity of the explosion-proof box 3105 is in a sealed state, and only the first air pipe 3109 and the second air pipe 3110 are connected to the two-position three-way solenoid valve 3111 and the gas pressure sensor 3112 respectively. According to Pascal's law, in a closed container, the pressure applied to a static liquid will be transmitted to each point at the same time with equal value. For gas in a balanced state, there is a similar property, that is, the pressure is equal in each connected part. That is to say, the gas pressure sensor 3112 is mainly used to monitor the air pressure in the inner cavity of the explosion-proof box 3105 in real time, so as to judge the extrusion force of the explosion-proof box 3105 connected to the first airbag rubber sheet 3108, so as to know whether the first airbag rubber sheet 3108 is clamped above the anti-gas valve. The pressure on the tablet computer is sensed and the pressure on the tablet computer is fed back to the programmable controller in time. If the detected air pressure is less than the preset clamping force, the programmable controller can control the two-position three-way solenoid valve 3111 to inflate. If the detected air pressure is greater than the preset clamping force, the programmable controller can control the two-position three-way solenoid valve 3111 to exhaust. The programmable controller controls the second push rod of the two miniature telescopic push rods 3103 on the first base plate 2 or the second base plate 31 to rise and fall synchronously. Through the lifting and lowering of the second push rod of the two miniature telescopic push rods 3103, the lifting and lowering can be adjusted according to the thickness of tablet computers of different models or the thickness of components of tablet computers, such as the tablet computer screen assembly.

[0035] In this embodiment, the working process of the intelligent pressure-maintaining fixture for a tablet computer is as follows: 1). The first push rod in the electric push cylinder 7 is retracted upward and the second top plate 4 is pulled upward. A plurality of double-layer laminates 3 are gradually unfolded upward by a plurality of two-fold herringbone curved arms 8, thereby increasing the space on the plurality of double-layer laminates 3 and the first bottom plate 2, so as to facilitate the placement of tablet computers or screen assemblies of uniform specifications on the plurality of double-layer laminates 3 and the first bottom plate 2. Note that the flat surface of the component to be clamped and held under pressure should be placed upward, such as placing the smooth and flat screen side of the tablet computer upward and the side with the lens protruding from the back of the tablet computer shell downward on the first airbag rubber sheet 3108.

[0036] 2). According to the thickness of the tablet computer or screen assembly that needs to be clamped and pressed, adjust the extension length of the second push rod in the micro-telescopic push rod 3103 on the multiple double-layered plates 3 and the first bottom plate 2, so that the distance between the first bottom plate 2 and the upper double-layered plate 3, the distance between the two double-layered plates 3, and the distance between the top double-layered plate 3 and the second top plate 4 remain the same, and the pressure detected by the second pressure sensors on the multiple fixed blocks 3204 is used to re-verify the clamping force between the first bottom plate 2 and the upper double-layered plate 3, between the two double-layered plates 3, and between the top double-layered plate 3 and the second top plate 4.

[0037] 3). The programmable controller controls the electric push cylinder 7 to push the second top plate 4 down along the four guide columns 5 through the first push rod, and the first pressure sensor 9 promptly feeds back the clamping force of the first push rod on the second top plate 4 to the programmable controller.

[0038] 4). Open all the working ports on the two-position three-way solenoid valves 3111 through the programmable controller, and fill the first bottom plate 2 and the explosion-proof boxes 3105 in the plurality of double-layered plates 3 with compressed gas, respectively. The filled compressed gas is used to expand and lift the first airbag rubber sheet 3108 upward, and due to the deformability of the first airbag rubber sheet 3108, the expanded first airbag rubber sheet 3108 can change according to the shape of the clamped tablet computer shell, so that the screen of the tablet computer can be more stably pressed and clamped on the buffer pads 3 on the inner top surface of the plurality of first top plates 32 or the second top plates 4. 205, and a gas pressure sensor 3112 connected to one side of the first base plate 2 and several double-layer pressing plates 3 detects the clamping force of the first airbag rubber sheet 3108 on the tablet computer. If the detected air pressure is within the preset clamping force range, the working port and the air inlet in the two-position three-way solenoid valve 3111 are in a closed state to perform pressure-maintaining clamping. If the detected air pressure is less than the preset clamping force, the two-position three-way solenoid valve 3111 can be controlled by a programmable controller to inflate. If the detected air pressure is greater than the preset clamping force, the two-position three-way solenoid valve 3111 can be controlled by a programmable controller to exhaust.

[0039] Example 2: According to Example 1, the smooth and precise lifting of several double-layered plates 3 and the second top plate 4 along the four guide columns 5 can greatly shorten the loading and unloading time of the tablet computer or screen assembly in the fixture. If the lifting is not smooth, it will cause operation jams, prolong the time for placing and removing the tablet computer, thereby reducing the overall production efficiency. During the clamping process, smooth lifting can ensure that each component reaches the predetermined position quickly and accurately, and realize efficient clamping and pressure holding operation. To this end, Example 2 proposes a sleeve 33 that reduces the friction required for the lifting of several double-layered plates 3 and the second top plate 4 along the four guide columns 5, thereby reducing the wear degree of the outer wall of the guide column 5 and the inner wall of the first guide hole 3102 or the second guide hole 3202. The outer ring of the sleeve 33 is coaxially fixedly installed in the first guide hole 3102 or the second guide hole 3202.

[0040] like Figure 7-9 As shown, based on Example 1, a sleeve 33 is installed in the first guide hole 3102 and the second guide hole 3202, and the sleeve 33 is mainly composed of four first circular rings 3301 and four second circular rings 3302. The outer walls of the first circular rings 3301 and the second circular rings 3302 are coaxially fixedly connected to the inner walls of the first guide hole 3102 or the second guide hole 3202. The four first circular rings 3301 and the four second circular rings 3302 are respectively staggered and overlapped, and a plurality of mutually connected positioning holes 3303 are provided on the four first circular rings 3301 and the four second circular rings 3302, and bolts 3304 are fixedly installed in the plurality of mutually connected positioning holes 3303. More than three uniformly distributed first mounting holes 3306 are respectively provided in the inner circles of the first circular rings 3301, and more than three uniformly distributed first mounting holes 3306 are respectively provided in the inner circles of the second circular rings 3302. More than three evenly distributed second mounting holes 3307, a plurality of first mounting holes 3306 are respectively connected and correspond to a plurality of second mounting holes 3307, and a pulley 3305 is rotatably mounted in each of the first mounting holes 3306 and the second mounting holes 3307 that are connected to each other, the outer wall of each pulley 3305 is in rolling contact with the outer wall of the guide column 5, a cylinder 3310 is coaxially fixedly mounted on both ends of the pulley 3305, and mutually symmetrical first semicircular holes 3308 are arranged on both sides of the first mounting hole 3306, and mutually symmetrical second semicircular holes 3309 are arranged on both sides of the second mounting hole 3307, and a plurality of first semicircular holes 3308 and a plurality of second semicircular holes 3309 are connected and correspond to each other, that is, the cylinder 3310 is rotatably arranged in the first semicircular holes 3308 and the second semicircular holes 3309 that are connected to each other; As can be seen from the above, several double-layered plates 3 and the second top plate 4 are used to convert the sliding friction between the first guide hole 3102 or the second guide hole 3202 and the guide column 5 into rolling friction through multiple sleeves 33, which reduces the friction force and makes the lifting and lowering smoother.

[0041] Example 3: Reference Figure 4 It can be seen that the first airbag rubber sheet 3108 in Example 1 is a whole-sheet design. Compared with the several second rubber sheets 3115 with a grid design, the first airbag rubber sheet 3108 with a whole-sheet design may have larger deformations in some parts and smaller deformations in other parts under the same situation, resulting in uneven supporting force. The grid design can disperse the pressure into each small grid, so that when subjected to external force, each small area can bear part of the force, thereby achieving more uniform support.

[0042] Compared with Example 1, the main difference between Example 3 and Example 1 is that the explosion-proof box 3105 in Example 3 does not require a porous sponge plate and a first airbag rubber sheet 3108, but a connecting frame 3107 is directly embedded and installed on the inner bottom surface of the groove of the explosion-proof box 3105.

[0043] like Fig.10 As shown, a grid frame 3114 is fixedly installed in the inner circle of the connection frame 3107, and second rubber sheets 3115 are fixedly installed in several partition holes in the grid frame 3114. A support plate 3116 is fixedly installed on the upper surface of each second rubber sheet 3115.

[0044] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An intelligent pressure-maintaining fixture for a tablet computer, characterized in that: It comprises a plurality of double-layered plates (3), a first bottom plate (2), a second top plate (4), four guide columns (5), an electric push cylinder (7) and a plurality of two-fold herringbone curved arms (8), wherein the double-layered plates (3) are mainly composed of a second bottom plate (31) and a first top plate (32) which are parallel to each other, and the second bottom plate (31) is fixedly mounted above the first top plate (32); The lower ends of the four guide columns (5) are respectively fixedly mounted vertically at the four corners of the first bottom plate (2); a plurality of the double-layered plates (3) are installed on the top of the first bottom plate (2) in a layered manner through the four guide columns (5); the second top plate (4) is installed on the top of the plurality of the double-layered plates (3) in a layered manner through the four guide columns (5); the two ends of the plurality of the two-fold herringbone curved arms (8) are respectively hinged on the side surfaces of the two double-layered plates (3), the side surfaces of the double-layered plates (3) and the first bottom plate (2), or the side surfaces of the double-layered plates (3) and the second top plate (4); and the range of the rotation angle is 15°-16°. 5°, a connecting frame (6) is fixedly installed on the top of the four guide columns (5), the electric push cylinder (7) is fixedly installed on the connecting frame (6), the first push rod in the electric push cylinder (7) is vertically downward and connected to the second top plate (4), and micro-telescopic push rods (3103) are vertically installed on the side end surfaces of a plurality of the second bottom plates (31) and the first bottom plate (2), and fixed blocks (3204) are installed on the side end surfaces of a plurality of the first top plates (32) and the second top plates (4), and the plurality of micro-telescopic push rods (3103) and the plurality of fixed blocks (3204) are all on the same vertical plane.

2. The intelligent pressure-maintaining fixture for a tablet computer according to claim 1, characterized in that: The second bottom plate (31) comprises an explosion-proof box (3105) and a first airbag rubber sheet (3108); a cover plate (3104) is sealedly mounted on the lower opening of the explosion-proof box (3105); a groove is arranged on the upper surface of the explosion-proof box (3105); a plurality of air holes (3106) are arranged on the inner bottom surface of the groove and are in communication with the inner cavity of the explosion-proof box (3105); the first airbag rubber sheet (3108) is arranged parallel to the inner bottom surface of the groove; a first air pipe (3109) and a second air pipe (3110) are fixedly connected on one side of the explosion-proof box (3105); a gas pressure sensor (3112) is fixedly mounted on the end of the first air pipe (3109); a two-position three-way solenoid valve (3111) is fixedly mounted on the end of the second air pipe (3110); and an air inlet of the two-position three-way solenoid valve (3111) is connected to a high-pressure gas storage tank via a conduit.

3. The intelligent pressure-maintaining fixture for a tablet computer according to claim 2, characterized in that: A central control box (1) is fixedly mounted below the first base plate (2), a programmable controller is fixedly mounted inside the central control box (1), and the gas pressure sensor (3112), the two-position three-way solenoid valve (3111), and a plurality of the miniature telescopic push rods (3103) are respectively connected to the programmable controller via wires.

4. The intelligent pressure-maintaining fixture for a tablet computer according to claim 3, characterized in that: A second pressure sensor is fixedly mounted on the lower surface of the fixed block (3204), a first pressure sensor (9) is fixedly connected between the first push rod in the electric push cylinder (7) and the second top plate (4), and the first pressure sensor (9) and a plurality of second pressure sensors are respectively connected to a programmable controller via wires.

5. The intelligent pressure-maintaining fixture for a tablet computer according to claim 2, characterized in that: An outer frame (3101) is fixedly installed on the periphery of the explosion-proof box (3105), and the gas pressure sensor (3112) and the two-position three-way solenoid valve (3111) are both fixedly connected to the outer frame (3101).

6. The intelligent pressure-maintaining fixture for a tablet computer according to claim 2, characterized in that: A connection frame (3107) is fixedly mounted on the outer ring of the first airbag rubber sheet (3108), and the connection frame (3107) is embedded and fixedly mounted on the outer ring of the groove.

7. The intelligent pressure-maintaining fixture for a tablet computer according to claim 5, characterized in that: First guide holes (3102) for connecting to guide posts (5) are provided at the four corners of the outer frame (3101), and first rotation holes (3113) for connecting to two-fold herringbone curved arms (8) are provided on both side end surfaces of the outer frame (3101).

8. The intelligent pressure-maintaining fixture for a tablet computer according to claim 2, characterized in that: A porous sponge plate is fitted on the inner bottom surface of the groove, and the lower surface of the first airbag rubber sheet (3108) and the upper surface of the porous sponge plate are in contact with each other.

9. The intelligent pressure-maintaining fixture for a tablet computer according to claim 1, characterized in that: The first top plate (32) is mainly composed of a rectangular plate (3201), and a buffer pad (3205) is fixedly mounted on the lower bottom surface of the rectangular plate (3201).

10. The intelligent pressure-maintaining fixture for a tablet computer according to claim 9, characterized in that: Second guide holes (3202) for connecting to guide posts (5) are provided at the four corners of the rectangular plate (3201), and second rotation holes (3203) for connecting to two-fold herringbone curved arms (8) are provided on both side end surfaces of the rectangular plate (3201).

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