Screen mesh tightening device

Abstract

The utility model discloses a screen tightening device which comprises a frame, a side length clamping and dragging mechanism, a corner clamping and dragging mechanism, a jacking mechanism and a tension monitoring device. The side length clamping and dragging mechanism comprises a first bottom plate, a side length translation driving assembly, a main body clamping assembly arranged on the first bottom plate and end clamping assemblies symmetrically arranged on the first bottom plate and located on the two sides of the main body clamping assembly, and the ends, close to the main body clamping assembly, of the end clamping assemblies are arranged on the first bottom plate through rotating shafts; an elastic reset assembly is arranged on the first bottom plate. The side length clamping and dragging mechanism and the corner clamping and dragging mechanism are used for clamping the four edges and the four corners of the screen and tensioning the screen; through cooperation of the jacking mechanism and the tension monitoring device, the screen is tightened, and it is guaranteed that the tension of the center area of the tightened screen meets the requirement; tension near the vertex angle of the screen is reduced through the rotatable end clamping assembly, and local breakage of the area, close to the vertex angle, of the screen due to too large tension is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of screen tensioning, in particular to a screen tensioning device. Background Art

[0002] Screening machine can remove impurities, remove large particles, and make the powder particles uniform. Among them, the screen is an important component of the screening machine. Tightening the screen on the mesh frame is an important step to ensure effective screening of the screen. By effectively tightening the rectangular screen, the screen can be set tight on the mesh frame.

[0003] The specific steps of tightening the screen are: clamping the screen around with the clamping assembly; slowly tightening the screen with the screen tensioning machine; driving the grid frame upward with the cylinder to make the grid frame abut against the screen, thereby tightening the screen.

[0004] In the prior art, a patent with announcement number CN218505445U discloses an automatic net stretching machine. The automatic net stretching machine effectively tensions the four sides of the rectangular screen, but does not effectively tension the top corners of the screen. In addition, in the process of tightening the four sides of the screen, the tension in the area closer to the top corners will be greater, which is why the area near the top corners of the screen will be tensioned before the middle main body area of ​​the screen is tensioned. Continuing tension will cause local rupture in the area near the top corners of the screen, causing damage to the screen.

[0005] In addition, when the cylinder drives the grid frame to move upward, the cylinder cannot accurately control the degree to which the grid frame lifts the screen, that is, it cannot ensure the tension of the center of the screen. Utility Model Content

[0006] The purpose of the utility model is to provide a screen tensioning device to achieve effective tensioning of the edges and top corners of the screen, so that the area of ​​the screen close to the top corner can be tensioned without being torn, and to ensure that the frame effectively tightens the center area of ​​the screen.

[0007] The purpose of the utility model can be achieved through the following technical solutions:

[0008] A screen tensioning device, comprising a frame, side length clamping and dragging mechanisms respectively arranged at four sides of the frame, corner clamping and dragging mechanisms respectively arranged at four top corners of the frame, a jacking mechanism vertically arranged at the center of the frame, and a tension monitoring device for monitoring the tension of the screen, wherein the jacking mechanism and the tension monitoring device are respectively electrically connected to a controller;

[0009] The side length clamping and dragging mechanism includes a first base plate, a side length translation driving assembly arranged on the side length of the frame for dragging the first base plate, a main body clamping assembly arranged on the first base plate, and end clamping assemblies symmetrically arranged on the first base plate and located on both sides of the main body clamping assembly, one end of the end clamping assembly close to the main body clamping assembly is arranged on the first base plate through a rotating shaft, and the end of the end clamping assembly away from the main body clamping assembly is a free end; an elastic reset assembly is arranged on the first base plate, and the elastic reset assembly is located on the inner side of the free end.

[0010] The four sides and four corners of the screen are clamped by the side length clamping and dragging mechanism and the corner clamping and dragging mechanism to tension the screen; the tension near the top corner of the screen is reduced by the rotatable end clamping assembly to prevent the screen from being partially broken due to excessive tension in the area close to the top corner, thereby effectively protecting the screen; the jacking mechanism and the tension monitoring device are coordinated to enable the grid placed on the grid support tooling to jack up the center area of ​​the screen, tighten the screen, and ensure that the tension in the center area of ​​the screen meets the requirements after tightening.

[0011] As a further solution of the utility model, a limit block is provided on the first bottom plate for preventing the free end of the end clamping assembly from deflecting outward, and the limit block is located outside the free end. With the above structure, the free end of the end clamping assembly is prevented from deflecting outward.

[0012] As a further solution of the utility model, the side length translation drive assembly includes a plurality of first translation cylinders and a plurality of first guide rails spaced apart along the corresponding side length direction of the frame; the first translation cylinder is fixed to the top of the frame and is located below the first bottom plate, and the cylinder rod of the first translation cylinder is connected to the first bottom plate through a first connecting plate; the first guide rail is fixed to the top of the frame and is located below the first bottom plate, and a first slide foot mounted on the first guide rail is fixed to the lower surface of the first bottom plate. With the above structure, the first bottom plate is driven to move by the translation cylinder.

[0013] As a further solution of the utility model, the main body clamping assembly includes a main body lower clamping plate and a main body upper clamping plate; the main body lower clamping plate is horizontally fixed on the first bottom plate through a plurality of main body support columns and extends along the corresponding side length direction of the frame; the main body upper clamping plate is escalably arranged on the first bottom plate through a plurality of main body lifting cylinders and is relatively arranged directly above the main body lower clamping plate. With the above structure, the screen is effectively clamped by the main body lower clamping plate and the main body upper clamping plate.

[0014] As a further solution of the utility model, the end clamping assembly includes a supporting base plate, an end lower clamping plate and an end upper clamping plate; the supporting base plate is horizontally arranged and spaced apart from the first base plate in the upper and lower parts; the end of the supporting base plate close to the main body clamping assembly is arranged on the first base plate through the rotating shaft, and the end of the supporting base plate away from the main body clamping assembly is the free end, and the free end is provided with a supporting roller in contact with the first base plate; the end lower clamping plate is horizontally fixed to the first base plate through a plurality of end support columns and extends along the corresponding side length direction of the frame; the end upper clamping plate is liftably arranged on the first base plate through a plurality of end lifting cylinders, and is relatively arranged just above the end lower clamping plate. With the above structure, the screen is effectively clamped by the end lower clamping plate and the end upper clamping plate.

[0015] As a further solution of the utility model, the corner clamping and dragging mechanism includes a second bottom plate, a top angle translation driving assembly provided on the top angle of the frame for dragging the second bottom plate, and a corner clamping assembly provided on the second bottom plate. With the above structure, the corner clamping assembly is driven to move by the top angle translation driving assembly.

[0016] As a further solution of the utility model, the top angle translation drive assembly includes a second translation cylinder and a second guide rail; the second translation cylinder is fixed to the top of the frame and is located below the second bottom plate, and the cylinder rod of the second translation cylinder is connected to the second bottom plate through a second connecting plate; the second guide rail is fixed to the top of the frame and is located below the second bottom plate, and the lower surface of the second bottom plate is provided with a second slide foot mounted on the second guide rail. With the above structure, the second bottom plate is driven to move by the second translation cylinder.

[0017] As a further solution of the utility model, the corner clamping assembly includes a corner lower clamping plate and a corner upper clamping plate; the corner lower clamping plate is horizontally fixed to the second bottom plate through a corner support column; the corner upper clamping plate is arranged to be raised and lowered by a corner lifting cylinder, and is relatively arranged just above the corner lower clamping plate. With the above structure, the screen is effectively clamped by the corner lower clamping plate and the corner upper clamping plate.

[0018] As a further solution of the utility model, a guide vertical plate located outside the corner lower clamping plate is fixed on the second bottom plate, and the corner upper clamping plate is provided with a guide support wheel rolling on the inner side of the guide vertical plate. With the above structure, the corner upper clamping plate is supported by the guide support wheel for smooth lifting.

[0019] As a further solution of the utility model, the lifting mechanism includes a servo electric cylinder and a plurality of guide components distributed around the servo electric cylinder; the servo electric cylinder is vertically arranged at the center of the frame, and its driving end is connected to the bottom center of the grid support tooling; the servo electric cylinder and the tension monitoring device are electrically connected to the controller respectively; the guide component is vertically arranged between the frame and the grid support tooling. The above structure is adopted to enable the grid to smoothly lift the central area of ​​the screen.

[0020] As a further solution of the present invention, the frame is a square frame.

[0021] Beneficial effects of the utility model:

[0022] The four sides and four corners of the screen are clamped by the side length clamping and dragging mechanism and the corner clamping and dragging mechanism to tension the screen;

[0023] The rotatable end clamping assembly reduces the tension near the top corner of the screen, preventing the area near the top corner of the screen from being partially broken due to excessive tension, effectively protecting the screen;

[0024] Through the cooperation of the lifting mechanism and the tension monitoring device, the grid placed on the grid support tooling can lift the central area of ​​the screen to tighten the screen and ensure that the tension in the central area of ​​the screen meets the requirements after tightening. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described below in conjunction with the accompanying drawings:

[0026] Figure 1 It is a schematic diagram (I) of the utility model;

[0027] Figure 2 It is a schematic diagram (II) of the utility model;

[0028] Figure 3 It is a partial schematic diagram of the jacking mechanism in the utility model (I);

[0029] Figure 4 It is a partial schematic diagram of the jacking mechanism in the utility model (II);

[0030] Figure 5 It is a schematic diagram of the side length clamping and dragging mechanism in the utility model (I);

[0031] Figure 6 This is a schematic diagram of the side length clamping and dragging mechanism of the utility model (II);

[0032] Figure 7 yes Figure 6 The enlarged schematic diagram of point B in the middle;

[0033] Figure 8 It is a partial schematic diagram of the side length clamping and dragging mechanism in the utility model (I);

[0034] Fig. 9 It is a partial schematic diagram of the side length clamping and dragging mechanism of the utility model (II);

[0035] Fig.10 It is a schematic diagram of the corner clamping and dragging mechanism of the utility model (I);

[0036] Fig.11 This is a schematic diagram of the corner clamping and dragging mechanism of the utility model (II);

[0037] Fig.12 It is a schematic diagram of the utility model for tensioning the screen.

[0038] Fig.13 It is a schematic diagram of a grid in the prior art.

[0039] The accompanying drawings are denoted as follows:

[0040] 1. Frame; 11. Support plate;

[0041] 2. Side length clamping and dragging mechanism; 21. First base plate; 22. Side length translation driving assembly; 221. First translation cylinder; 222. First guide rail; 223. First connecting plate; 224. First sliding foot; 23. Main body clamping assembly; 231. Main body lower clamping plate; 232. Main body upper clamping plate; 233. Main body support column; 234. Main body lifting cylinder; 235. Main body connecting block; 24. End clamping assembly; 241. Support base plate; 242. End lower clamping plate; 243. End upper clamping plate; 244. End support column; 245. End lifting cylinder; 246. Support roller; 247. End connecting block; 25. Rotating shaft; 26. Elastic reset assembly; 261. Stop block; 262. Guide rod; 263. Spring; 27. Limit block;

[0042] 3. Corner clamping and dragging mechanism; 31. Second bottom plate; 32. Top angle translation driving assembly; 321. Second translation cylinder; 322. Second guide rail; 323. Second connecting plate; 324. Second sliding foot; 33. Corner clamping assembly; 331. Corner lower clamping plate; 332. Corner upper clamping plate; 333. Corner support column; 334. Corner lifting cylinder; 335. Guide support wheel; 336. Guide vertical plate; 337. Corner connecting block;

[0043] 4. Lifting mechanism; 41. Servo electric cylinder; 42. Guide assembly; 421. Guide column; 422. Guide sleeve; 423. Third connecting plate; 43. Grid support fixture; 431. Support disc; 432. Positioning ring; 433. First avoidance hole; 434. Second avoidance hole;

[0044] 5. Grid; 51. Waveguide;

[0045] 6. Screen. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] A screen tensioning device, see Figure 1 and Figure 2 As shown, it includes a frame 1, side length clamping and dragging mechanisms 2 respectively arranged at the four sides of the frame 1, corner clamping and dragging mechanisms 3 respectively arranged at the four top corners of the frame 1, a jacking mechanism 4 vertically arranged at the center of the frame 1, and a tension monitoring device for monitoring the tension of the screen 6. The jacking mechanism 4 and the tension monitoring device are electrically connected to the controller respectively.

[0048] Among them, frame 1 is a square frame.

[0049] In this embodiment, before the screen 5 is tightened, its outer edge contour is square.

[0050] See also Figure 5 and Figure 6 As shown, the side length clamping and dragging mechanism 2 comprises a first bottom plate 21, a side length translation driving assembly 22 arranged on the side length of the frame 1 for dragging the first bottom plate 21, a main body clamping assembly 23 arranged on the first bottom plate 21, and end clamping assemblies 24 symmetrically arranged on the first bottom plate 21 and located on both sides of the main body clamping assembly 23. The end of the end clamping assembly 24 close to the main body clamping assembly 23 is arranged on the first bottom plate 21 through a rotating shaft 25, and the end of the end clamping assembly 24 away from the main body clamping assembly 23 is a free end. The side length clamping and dragging mechanism 2 clamps the side of the screen 5 through the main body clamping assembly 23 and the end clamping assembly 24, and drives the main body clamping assembly 23 and the end clamping assembly 24 to move through the side length translation driving assembly 22.

[0051] In this embodiment, the rotating shaft 25 is vertically fixed on the top of the first bottom plate 21. A bearing is provided on the rotating shaft 25. The inner ring of the bearing is fixed on the rotating shaft 25, and the outer ring of the bearing is fixed on the end clamping assembly 24. The end clamping assembly 24 rotates horizontally on the rotating shaft 25 through the bearing.

[0052] In this example, see Fig.12As shown, the steps of the screen tensioning device to tension the edge and top corner of the screen 5 are as follows:

[0053] The four sides of the screen 5 are clamped by the side length clamping and dragging mechanism 2, and the top corner of the screen 5 is clamped by the corner clamping and dragging mechanism 3;

[0054] The side length clamping and dragging mechanism 2 and the corner clamping and dragging mechanism 3 respectively move in a direction away from the center of the screen 5, that is, pull the screen 5 outward, thereby tightening the edge and top corner of the screen 5.

[0055] See also Fig.12 As shown, during the process of tightening and dragging the edge of the screen 5 outward, the free end of the end clamping assembly 24 is not constrained by the first bottom plate 21, and therefore does not move outward synchronously with the first bottom plate 21. Instead, relative to the first bottom plate 21, the free end is deflected toward the inside of the frame 1, thereby reducing the tension of the screen 5 near the top corner area, avoiding local rupture in the area near the top corner of the screen 5, and effectively protecting the screen 5.

[0056] Further, in order to avoid excessive tension in the area near the top corner of the screen 5, please refer to Figure 7 and Figure 8 As shown, an elastic reset component 26 is provided on the first bottom plate 21, and the elastic reset component 26 is located on the inner side of the free end.

[0057] See also Figure 8 As shown, the elastic reset assembly 26 includes a stopper 261, a guide rod 262 and a spring 263. The stopper 261 is fixed on the first bottom plate 21 and is located on the inner side of the free end. One end of the guide rod 262 is fixed on the inner side of the free end, and the other end passes through the through hole of the stopper 261 and extends to the outside of the stopper 261. The spring 263 is sleeved on the guide rod 262, one end of which abuts against the inner side of the free end, and the other end of which abuts against the inner side of the stopper 261.

[0058] In the process of the screen 5 dragging the end clamping assembly 24 to rotate horizontally, the distance between the free end and the stopper 261 is gradually reduced, and the spring 263 is compressed. The elastic reset assembly 26 uses the elastic force of the spring 263 to provide resistance to the deflection of the end clamping assembly 24 toward the inside of the frame 1, so that the area near the top corner of the screen 5 can be tightened without being torn.

[0059] See also Figure 8 and Fig. 9As shown, a stopper 27 is provided on the first bottom plate 21. The stopper 27 is located outside the free end and is used to prevent the free end of the end clamping assembly 24 from deflecting outward. That is to say, when the main clamping assembly 23 and the end clamping assembly 24 of the side length clamping and dragging mechanism 2 do not clamp the edge of the screen 5 or the side length clamping and dragging mechanism 2 does not drag the edge of the screen 5 to move outward, the elastic force of the spring 263 also has the function of driving the end clamping assembly 24 to reset, that is, under the action of the restoring elastic force of the spring 263 and the blocking action of the stopper 27, the end clamping assembly 24 and the main clamping assembly 23 are kept in the same straight line.

[0060] See also Figure 1 and Figure 2 As shown, the corner clamping and dragging mechanism 3 includes a second bottom plate 31, a top angle translation driving assembly 32 provided on the top angle of the frame 1 for dragging the second bottom plate 31, and a corner clamping assembly 33 provided on the second bottom plate 31. The corner clamping and dragging mechanism 3 clamps the top angle of the screen 5 through the corner clamping assembly 33, and drives the corner clamping assembly 33 to move through the top angle translation driving assembly 32.

[0061] See also Figure 2 to Figure 4 As shown, the lifting mechanism 4 includes a servo electric cylinder 41 and a plurality of guide components 42 distributed around the servo electric cylinder 41. The servo electric cylinder 41 is vertically arranged at the center of the frame 1, and its driving end is connected to the bottom center of the grid support fixture 43 through a universal joint. When the servo electric cylinder 41 drives the grid support fixture 43 to be lifted, the plurality of guide components 42 are used for lifting and lowering guide of the grid support fixture 43, so that the grid support fixture 43 can be lifted and lowered more smoothly. The servo electric cylinder 41 and the tension monitoring device are electrically connected to the controller respectively. The guide component 42 is vertically arranged between the frame 1 and the grid support fixture 43. In the process of the lifting mechanism 4 driving the grid support fixture 43 to be lifted, the universal joint has a good absorption and buffering effect on the impact load and vibration.

[0062] Specifically, a horizontally arranged support plate 11 is assembled on the middle and lower part of the frame 1. The servo electric cylinder 41 is fixed on the upper surface of the support plate 11. The guide assembly 42 includes a guide column 421 and a guide sleeve 422 that cooperate with each other. The guide column 421 is vertically fixed on the upper surface of the support plate 11. The guide sleeve 422 is arranged at the bottom of the grid support fixture 43 through the third connecting plate 423 and is sleeved on the middle and upper part of the guide column 421. A plurality of first avoidance holes 433 for avoiding the guide columns 421 are vertically opened on the grid support fixture 43. When the servo electric cylinder 41 drives the grid support fixture 43 to move downward, the guide column 421 can pass through the first avoidance hole 433.

[0063] In this embodiment, the grid support tool 43 includes a support disc 431 and a positioning ring 432 arranged on the edge of the support disc 431. The grid 5 is placed on the top of the support disc 431, and the outer edge of the grid 5 is positioned by the positioning ring 432.

[0064] In this embodiment, the grid 5 is an ultrasonic grid. Specifically, in the prior art, the patent with the announcement number CN212975856U discloses the specific structure of the ultrasonic grid. Fig.13 As shown, a waveguide 51 is disposed on the grid 5. A second avoidance hole 434 for avoiding the waveguide 51 is opened on the support disc 431.

[0065] In this embodiment, there are three guide components 42 , which are distributed at equal angles around the servo cylinder 41 .

[0066] In this embodiment, the tension monitoring device is a tension meter, which is mounted on the manipulator and located above the screen 6, and is used to detect the tension on the upper surface of the screen 6 and transmit the detection data to the controller.

[0067] In this example, see Figure 1 and Figure 2 As shown, the steps of tightening the screen 5 by the screen tightening device are as follows:

[0068] The grid frame 5 is placed in the grid frame support fixture 43, and the top surface of the grid frame 5 protrudes from the top surface of the grid frame support fixture 43; the screen 6 is placed above the grid frame 5, and the edge and top corner of the screen 6 are tensioned by the side length clamping and dragging mechanism 2 and the corner clamping and dragging mechanism 3. At this time, the central area of ​​the screen 6 is located directly above the grid frame 5; the servo electric cylinder 41 drives the grid frame 5 to move upward, so that the grid frame 5 lifts the central area of ​​the screen 6 to tighten the screen 6, and at the same time, the tension in the central area of ​​the screen 6 is monitored by the tension monitoring device; the controller controls the driving end of the servo electric cylinder 41 to move upward or stop moving according to the tension monitored by the tension monitoring device. When the tension monitoring device detects that the tension in the central area of ​​the screen 5 is less than the preset value of the controller, the controller controls the driving end of the servo electric cylinder 41 to move upward; when the tension monitoring device detects that the tension in the center of the screen 5 is equal to the preset value of the controller, the controller controls the driving end of the servo electric cylinder 41 to stop moving, that is, the screen tensioning device completes the tensioning of the screen 5.

[0069] The utility model clamps the edge and the top corner of the screen 5 by the side length clamping and dragging mechanism 2 and the corner clamping and dragging mechanism 3 and tensions the edge and the top corner of the screen 5; clamps the edge of the screen 5 on the same side in sections by the side length clamping and dragging mechanism 2; reduces the tension near the top corner of the screen 5 by the rotatable end clamping component 24, prevents the screen 5 from being partially broken due to excessive tension in the area close to the top corner, and effectively protects the screen 5; cooperates with the servo electric cylinder 41 and the tension monitoring device, so that the grid 5 placed on the grid support tooling 43 lifts the central area of ​​the screen 6, tightens the screen 6, and ensures that the tension in the central area of ​​the screen 6 after tightening meets the requirements.

[0070] See also Figure 6 and Figure 7 As shown, the side length translation drive assembly 22 includes a plurality of first translation cylinders 221 and a plurality of first guide rails 222 that are spaced apart along the corresponding side length direction of the frame 1. The first translation cylinder 221 is fixed to the top of the frame 1 and is located below the first base plate 21. The cylinder rod of the first translation cylinder 221 is connected to the first base plate 21 through a first connecting plate 223. The first guide rail 222 is fixed to the top of the frame 1 and is located below the first base plate 21. A first sliding foot 224 mounted on the first guide rail 222 is provided on the lower surface of the first base plate 21.

[0071] The cylinder rod of the first translation cylinder 221 is parallel to the corresponding first guide rail 222 , and both the first translation cylinder 221 and the first guide rail 222 are perpendicular to the side length of the frame 1 . The first sliding foot 224 is slidably mounted on the first guide rail 222 .

[0072] In this embodiment, two first translation cylinders 221 and two first guide rails 222 are arranged directly below the same first bottom plate 21, and the four are spaced apart. Specifically, the two first translation cylinders 221 are symmetrically distributed below the first bottom plate 21, and the two first guide rails 222 are symmetrically distributed below the first bottom plate 21.

[0073] See also Figure 5 As shown, the main body clamping assembly 23 includes a main body lower clamping plate 231 and a main body upper clamping plate 232. A plurality of main body support columns 233 and a plurality of main body lifting cylinders 234 are provided on the top of the first bottom plate 21. The main body lower clamping plate 231 is horizontally fixed on the first bottom plate 21 through the plurality of main body support columns 233. The main body lower clamping plate 231 extends along the corresponding side length direction of the frame 1. The main body upper clamping plate 232 is arranged on the first bottom plate 21 in a liftable manner through the plurality of main body lifting cylinders 234.

[0074] The main body lower clamping plate 231 is a fixed clamping plate, and the main body upper clamping plate 232 is a movable clamping plate. The main body upper clamping plate 232 is relatively arranged directly above the main body lower clamping plate 231. The edge of the screen 5 is placed between the main body lower clamping plate 231 and the main body upper clamping plate 232, and the main body clamping assembly 23 realizes the clamping and release of the edge of the screen 5 by moving the main body upper clamping plate 232 up and down.

[0075] Among them, the cylinder rod of the main body lifting cylinder 234 is connected to the top of the main body upper clamping plate 232 through the main body connecting block 235. On the same first bottom plate 21, the main body lifting cylinder 234 corresponds to the main body support column 233 in one-to-one position. The main body lifting cylinder 234 is located on the outside of the main body lower clamping plate 231, and the main body connecting block 235 is placed directly above the corresponding main body upper clamping plate 232. Since the main body upper clamping plate 232 is driven by multiple main body lifting cylinders 234 to move up and down, the clamping force of the main body clamping assembly 23 is large and the clamping force is evenly distributed, and the structure is stable.

[0076] In this embodiment, four main body support columns 233 and four main body lifting cylinders 234 are provided on the same first bottom plate 21 .

[0077] See also Figure 8 and Fig. 9 As shown, the end clamping assembly 24 includes a support base plate 241, an end lower clamping plate 242 and an end upper clamping plate 243. The support base plate 241 is horizontally arranged and is spaced apart from the first base plate 21. The end of the support base plate 241 close to the main body clamping assembly 23 is arranged on the first base plate 21 through a rotating shaft 25. The end of the support base plate 241 away from the main body clamping assembly 23 is a free end, and a support roller 246 in contact with the first base plate 21 is provided on the free end. A plurality of end support columns 244 and a plurality of end lifting cylinders 245 are provided on the top of the first base plate 21. The end lower clamping plate 242 is horizontally fixed to the first base plate 21 through a plurality of end support columns 244, and extends along the corresponding side length direction of the frame 1. The end upper clamping plate 243 is arranged on the first base plate 21 in a liftable manner through a plurality of end lifting cylinders 245.

[0078] The lower clamping plate 242 at the end is a fixed clamping plate, and the upper clamping plate 243 at the end is a movable clamping plate. The upper clamping plate 243 at the end is relatively arranged just above the lower clamping plate 242 at the end. The edge of the screen 5 near the top corner is placed between the lower clamping plate 242 at the end and the upper clamping plate 243 at the end. The end clamping assembly 24 clamps and releases the edge of the screen 5 near the top corner by moving the upper clamping plate 243 at the end up and down.

[0079] Among them, the cylinder rod of the end lifting cylinder 245 is connected to the top of the end upper clamping plate 243 through the end connecting block 247. On the same supporting bottom plate 241, the positions of the end lifting cylinder 245 and the end supporting column 244 correspond one to one, the end lifting cylinder 245 is located on the outside of the end lower clamping plate 242, and the end connecting block 247 is placed just above the end upper clamping plate 243. Since the end upper clamping plate 243 is driven by multiple end lifting cylinders 245 to move up and down, the clamping force of the end clamping assembly 24 is large and the clamping force is evenly distributed, and the structure is stable.

[0080] In this embodiment, two end support columns 244 and two end lifting cylinders 245 are provided on the same supporting base plate 241 .

[0081] See also Fig.10 and Fig.11 As shown, the top angle translation drive assembly 32 includes a second translation cylinder 321 and a second guide rail 322. The second translation cylinder 321 is fixed to the top of the frame 1 and is located below the second base plate 31. The cylinder rod of the second translation cylinder 321 is connected to the second base plate 31 through a second connecting plate 323. The second guide rail 322 is fixed to the top of the frame 1 and is located below the second base plate 31. A second sliding foot 324 mounted on the second guide rail 322 is provided on the lower surface of the second base plate 31. The cylinder rod of the second translation cylinder 321 is parallel to the corresponding second guide rail 322.

[0082] In this embodiment, the second sliding foot 324 is disposed at the bottom of the second bottom plate 31 , and the second sliding foot 324 is slidably assembled on the second guide rail 322 .

[0083] In this embodiment, a second translation cylinder 321 and a second guide rail 322 are provided directly below the second bottom plate 31. The second translation cylinder 321 and the second guide rail 322 are both parallel to the diagonal line of the frame 1.

[0084] See also Fig.10 and Fig.11 As shown, the corner clamping assembly 33 includes a corner lower clamping plate 331 and a corner upper clamping plate 332. A corner support column 333 and a corner lifting cylinder 334 are provided on the top of the second bottom plate 31. The corner lower clamping plate 331 is horizontally fixed on the second bottom plate 31 through the corner support column 333. The corner upper clamping plate 332 is arranged to be liftable through the corner lifting cylinder 334.

[0085] The lower corner clamping plate 331 is a fixed clamping plate, and the upper corner clamping plate 332 is a movable clamping plate. The upper corner clamping plate 332 is relatively arranged just above the lower corner clamping plate 331. The top corner of the screen 5 is placed between the lower corner clamping plate 331 and the upper corner clamping plate 332, and the corner clamping assembly 33 clamps and releases the top corner of the screen 5 by moving the upper corner clamping plate 332 up and down.

[0086] The cylinder rod of the corner lifting cylinder 334 is connected to the top of the corner upper clamping plate 332 through the corner connecting block 337. A corner lifting cylinder 334 and a corner support column 333 are provided on the same second bottom plate 31. The corner lifting cylinder 334 is located outside the corner lower clamping plate 331, and the corner connecting block 337 is placed just above the corner upper clamping plate 332.

[0087] Since the upper corner clamping plate 332 is driven by a corner lifting cylinder 334 to move up and down, the clamping force distribution of the main body clamping assembly 23 is concentrated, so the structure is unstable. Therefore, a guide vertical plate 336 located outside the lower corner clamping plate 331 is welded on the second bottom plate 31. The guide vertical plate 336 is located between the corner lifting cylinder 334 and the corner support column 333. A guide support wheel 335 is provided on the upper corner clamping plate 332. The guide support wheel 335 rolls on the inner side of the guide vertical plate 336.

[0088] In this embodiment, there are two guide support wheels 335, which are arranged at both ends of the corner upper clamping plate 332. When the corner upper clamping plate 332 is raised or lowered, the guide support wheels 335 roll on the inner side of the guide vertical plate 336, thereby guiding and supporting the corner upper clamping plate 332. The guide vertical plate 336 is a steel plate with a certain thickness, which can not only guide the lifting and lowering of the corner upper clamping plate 332, but also support the corner upper clamping plate 332 when pulling the corner of the screen 5.

[0089] In this embodiment, a relief notch is provided at the top of the guide vertical plate 336 to avoid interference with the up and down movement of the corner connecting block 337 .

[0090] In this embodiment, the corner connection block 337 passes through the top avoidance opening of the guide vertical plate 336 , that is, the corner connection block 337 and the guide vertical plate 336 do not interfere with each other.

[0091] The utility model clamps the four sides and four corners of the screen 6 through the side length clamping and dragging mechanism 2 and the corner clamping and dragging mechanism 3 and tensions the screen 6; reduces the tension near the top corners of the screen 6 through the rotatable end clamping assembly 24, prevents the screen 6 from being partially broken due to excessive tension in the area close to the top corner, and effectively protects the screen 6; through the cooperation of the lifting mechanism 4 and the tension monitoring device, the grid 5 placed on the grid support tooling 43 lifts the central area of ​​the screen 6, so that the screen 6 is tightened, and it is ensured that the tension in the central area of ​​the screen 6 after tightening meets the requirements.

[0092] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A screen tensioning device, characterized in that: It comprises a frame (1), side length clamping and dragging mechanisms (2) respectively arranged at the four side lengths of the frame (1), corner clamping and dragging mechanisms (3) respectively arranged at the four top corners of the frame (1), a lifting mechanism (4) vertically arranged at the center of the frame (1), and a tension monitoring device for monitoring the tension of the screen (6), wherein the lifting mechanism (4) and the tension monitoring device are respectively electrically connected to a controller; The side length clamping and dragging mechanism (2) comprises a first base plate (21), a side length translation driving assembly (22) arranged on the side length of the frame (1) and used for dragging the first base plate (21), a main body clamping assembly (23) arranged on the first base plate (21), and end clamping assemblies (24) symmetrically arranged on the first base plate (21) and located on both sides of the main body clamping assembly (23), wherein one end of the end clamping assembly (24) close to the main body clamping assembly (23) is arranged on the first base plate (21) via a rotating shaft (25), and one end of the end clamping assembly (24) away from the main body clamping assembly (23) is a free end; an elastic reset assembly (26) is arranged on the first base plate (21), and the elastic reset assembly (26) is located on the inner side of the free end.

2. The screen tensioning device according to claim 1, characterized in that: The first bottom plate (21) is provided with a limit block (27) for preventing the free end of the end clamping assembly (24) from deflecting outwards, and the limit block (27) is located outside the free end.

3. The screen tensioning device according to claim 1, characterized in that: The side length translation driving assembly (22) comprises a plurality of first translation cylinders (221) and a plurality of first guide rails (222) which are spaced apart and distributed along the corresponding side length direction of the frame (1); The first translation cylinder (221) is fixed on the top of the frame (1) and is located below the first bottom plate (21); the cylinder rod of the first translation cylinder (221) is connected to the first bottom plate (21) via a first connecting plate (223); The first guide rail (222) is fixed on the top of the frame (1) and is located below the first bottom plate (21); a first sliding foot (224) mounted on the first guide rail (222) is provided on the lower surface of the first bottom plate (21).

4. The screen tensioning device according to claim 1, characterized in that: The main body clamping assembly (23) comprises a main body lower clamping plate (231) and a main body upper clamping plate (232); The main body lower clamping plate (231) is horizontally fixed on the first bottom plate (21) through a plurality of main body support columns (233), and extends along the corresponding side length direction of the frame (1); The main body upper clamping plate (232) is arranged on the first bottom plate (21) in a liftable manner through a plurality of main body lifting cylinders (234), and is relatively arranged just above the main body lower clamping plate (231).

5. The screen tensioning device according to claim 1, characterized in that: The end clamping assembly (24) comprises a supporting bottom plate (241), an end lower clamping plate (242) and an end upper clamping plate (243); The supporting bottom plate (241) is arranged horizontally and is spaced apart from the first bottom plate (21) in the upper and lower directions. One end of the supporting bottom plate (241) close to the main body clamping assembly (23) is arranged on the first bottom plate (21) through the rotating shaft (25). One end of the supporting bottom plate (241) away from the main body clamping assembly (23) is the free end. The free end is provided with a supporting roller (246) in contact with the first bottom plate (21); The end lower clamping plate (242) is horizontally fixed on the first bottom plate (21) through a plurality of end support columns (244), and extends along the corresponding side length direction of the frame (1); The end upper clamping plate (243) is arranged on the first bottom plate (21) in a liftable manner through a plurality of end lifting cylinders (245), and is relatively arranged just above the end lower clamping plate (242).

6. The screen tensioning device according to claim 1, characterized in that: The corner clamping and dragging mechanism (3) comprises a second bottom plate (31), a top corner translation driving assembly (32) provided on a top corner of the frame (1) and used for dragging the second bottom plate (31), and a corner clamping assembly (33) provided on the second bottom plate (31).

7. The screen tensioning device according to claim 6, characterized in that: The vertex angle translation driving assembly (32) comprises a second translation cylinder (321) and a second guide rail (322); The second translation cylinder (321) is fixed on the top of the frame (1) and is located below the second bottom plate (31); the cylinder rod of the second translation cylinder (321) is connected to the second bottom plate (31) via a second connecting plate (323); The second guide rail (322) is fixed on the top of the frame (1) and is located below the second bottom plate (31); a second sliding foot (324) mounted on the second guide rail (322) is provided on the lower surface of the second bottom plate (31).

8. The screen tensioning device according to claim 7, characterized in that: The corner clamping assembly (33) comprises a lower corner clamping plate (331) and an upper corner clamping plate (332); The corner lower clamping plate (331) is horizontally fixed on the second bottom plate (31) via a corner support column (333); The upper corner clamping plate (332) is arranged to be liftable by a corner lifting cylinder (334), and is relatively arranged just above the lower corner clamping plate (331); A guide vertical plate (336) located outside the corner lower clamping plate (331) is fixed on the second bottom plate (31), and a guide support wheel (335) rolling on the inner side surface of the guide vertical plate (336) is provided on the corner upper clamping plate (332).

9. The screen tensioning device according to claim 1, characterized in that: The lifting mechanism (4) includes a servo electric cylinder (41) and a plurality of guide components (42) distributed around the servo electric cylinder (41); the servo electric cylinder (41) is vertically arranged at the center of the frame (1), and its driving end is connected to the bottom center of the grid support tooling (43); the servo electric cylinder (41) and the tension monitoring device are electrically connected to the controller respectively; the guide component (42) is vertically arranged between the frame (1) and the grid support tooling (43).

10. The screen tensioning device according to claim 1, characterized in that: The frame (1) is a square frame.

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