Frame plate type multi-layer composite screen mesh tensioning device for vibrating screen

Abstract

The utility model belongs to the technical field of vibrating screens, and particularly relates to a frame plate type multi-layer composite screen mesh tensioning device for a vibrating screen. The frame plate type multi-layer composite screen mesh tensioning device for the vibrating screen comprises a rack assembly, a front hydraulic cylinder set assembly, a front end U-shaped pressing plate assembly, a screen cloth fixing frame assembly, a rear hydraulic cylinder set assembly, a rear end U-shaped pressing plate assembly, an automatic cutting device, a screen cloth guiding assembly, first-layer screen cloth, a first-layer screen cloth winding device, second-layer screen cloth and a second-layer screen cloth winding device. The device comprises a first layer of screen cloth, a first layer of screen cloth, a second layer of screen cloth, a third layer of screen cloth winding device, a control device and a hydraulic station, can be used for respectively applying tensile force to tension each layer of screen cloth in the manufacturing process of the frame plate type multi-layer composite screen cloth for the vibrating screen, and can also be used for applying tensile force to tension single-layer screen cloth.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of vibrating screen, specifically relates to a frame plate type multilayer composite screen net tensioner for vibrating screen. BACKGROUND

[0002] In the process of oil drilling, the drill bit at the bottom of the well cuts the rock, and a large amount of rock cuttings and waste solid phase are generated in the well bottom and wellbore. The drilling fluid with certain density and viscosity is circulated from the ground to the well bottom, carrying the rock cuttings and other solid phases back to the ground, and then sequentially passing through the ground vibrating screen, sand remover, mud remover, medium-speed centrifuge, high-speed centrifuge and other solid-liquid separation and solid phase control equipment for step-by-step solid-liquid separation and purification, and then being pumped into the wellbore by the drilling pump for repeated circulation. Therefore, people often use the metaphor of "drilling fluid is the blood of drilling" to metaphorically represent its important position in oil drilling operation. Domestic and foreign drilling practice experience has proved that the content of solid phase in the drilling fluid and the size of solid phase particles have a great influence on the performance of the drilling fluid. So-called solid phase control (referred to as "solid control") is to remove harmful solid phase from the drilling fluid and preserve useful solid phase to meet the requirements of drilling technology. A large number of research results show that, under normal circumstances, increasing the solid phase content will increase the density, viscosity, shear force, mud cake thickness and sand content of the drilling fluid, and the water loss will decrease. These performance changes will significantly reduce the drilling speed, increase the drilling bit consumption, and lead to a substantial increase in the total drilling cost. The lower the solid phase content, the more obvious the effect of reducing the solid phase content. For non-dispersed solid phase drilling fluid, the solid phase content is generally not more than 4% (volume ratio), and the sand content should be less than 0.5%. Therefore, drilling fluid circulation purification and solid phase control are the key to ensure the implementation of normal drilling technology. Drilling fluid solid phase control has become an important factor that directly affects safe, high-quality and fast drilling and the protection of oil and gas layers, and is one of the important means and necessary conditions for realizing modern scientific drilling. With the development of oil exploration and development work, the drilling depth and difficulty are increasing, and the drilled strata are becoming increasingly complex, especially the development of some new drilling technologies, such as deep well, ultra-deep well drilling technology, large displacement horizontal well drilling technology, etc. The types and quantities of chemical additives used are greatly increased, making the composition of the drilling fluid more and more complex, the solid phase control and solid-liquid separation difficulty and the on-site labor intensity greater and greater, and the safety and environmental protection requirements of people-oriented are higher and higher, and the performance requirements of the drilling fluid are higher and higher, thereby putting forward higher requirements for the drilling fluid circulation purification and solid phase control system.

[0003] Vibration screen is the first stage solid-liquid separation equipment in the drilling fluid circulation purification and solid control system. During drilling, more than 80% of waste solid phase such as cuttings in the solid-liquid mixture returned from the well bottom and wellbore is separated from the drilling fluid by the vibration screen, the cuttings are dewatered and dried, and the drilling fluid is recycled, which is the core and key of the whole system. The vibration screen mainly removes the cuttings and other harmful solid phase particles in the drilling fluid through the screen, which is the core and key of the whole vibration screen. The screening efficiency, quality, reliability and service life of the screen directly affect the performance and service life of the drilling fluid vibration screen. The structure type, mesh size specification and manufacturing process level of the screen directly determine the primary purification efficiency, solid-liquid separation accuracy, drilling fluid recovery rate, cuttings drying degree and other factors. Moreover, the service life of the screen is the key to guarantee normal drilling. Once the screen is damaged, the vibration screen must be stopped for screen replacement, which directly affects the continuity of normal drilling process. Moreover, the damaged screen will cause a large amount of unseparated cuttings and other harmful solid phase to enter the drilling fluid circulation purification and solid control system together with the uncleaned drilling fluid, which has a very large adverse effect on the subsequent equipment purification, wear and tear of the vulnerable parts, service life, drilling speed and other factors. Since the screen is a vulnerable part, the main use cost of the vibration screen is the consumption of the screen, which accounts for a high proportion in the cost of drilling vulnerable parts. Therefore, the service life of the screen directly affects the level of drilling cost.

[0004] In order to improve the service life of the screen, various structural forms of the screen have been developed for many years. At present, the frame plate type multi-layer composite screen is mainly used. It is manufactured by stacking two or three screen cloths with different mesh numbers and different wire diameters and bonding them to the frame plate. Compared with other types of screens, this screen has high solid-liquid separation precision, good screening effect, long service life, and convenient and fast installation, fixation and replacement. However, in the manufacturing process of the screen in the prior art, the screen cloths of different mesh numbers are manually tensioned by manual tensioning, which has high labor intensity and the tensioning force of each layer of screen cloth is difficult to control. Either the tensioning force is too large and the screen cloth is too tight, which causes the screen wire to yield and damage early; or the screen cloth is not tight enough, the tensioning force is insufficient, and part of the screen cloth is in a relaxed state, which causes the solid phase separated by the vibrating screen to easily accumulate into a group in the local part, the solid phase migration is not smooth, and thus the screen is damaged and the service life is shortened by the "rubbing action" of the screen. The manual tensioning of the screen cloth causes the screen cloth to be unevenly tight, and in the vibrating process of the vibrating screen, the screen cloths hit and rub against each other, the gap between the screen cloths is large, and the solid phase particles are easily sandwiched between the two layers of screen cloth, which accelerates the damage of the screen, affects the liquid screen passing rate and the processing capacity of the vibrating screen, and affects the migration speed of the solid phase particles and the sand discharge effect. Therefore, the screen manufactured by the traditional manual tensioning method affects the screening effect, solid-liquid separation precision, solid phase migration efficiency and solid phase dewatering effect of the vibrating screen, thereby affecting the performance of the vibrating screen. More importantly, the damage and short service life of the screen of the vibrating screen cause the vibrating screen to stop and replace, which affects the drilling speed, the continuity of the drilling process and the increase of the screen consumption, thereby increasing the drilling cost.

[0005] Therefore, in order to further improve the service life of the screen, it is necessary to start from the manufacturing process of the screen, change the traditional manual tensioning method of the screen cloth, and use a screen cloth tensioning device and a process method with high automation and real-time control of the tensioning force.

[0006] The technical scheme of the invention patent with the application name "a screen and a manufacturing process thereof" and the application number "202110838191.9" is to heat and melt the resin at a temperature of 80-100℃, defoam the resin solution I, extrude the resin solution I into a mold, and cool and solidify the net body frame. The net body frame is placed in the mounting hole of the metal support frame, and an integrally formed screen is obtained by a secondary casting process.

[0007] The invention is named "a wave-shaped polyurethane one-time forming vibrating screen and production process", the application number is "202110946659.6", the technical solution of the invention patent published is as follows: a fixed frame is provided with a buffer mechanism on the outer surface of the lower end, a replaceable component is arranged inside the fixed frame, mounting frames are arranged on the outer surfaces of both sides of the fixed frame, and mounting hole protection mechanisms are arranged on the outer surfaces of the upper ends of the mounting frames; the wave-shaped polyurethane one-time forming vibrating screen production process is: raw material preparation, pre-polymer of polyurethane is preheated in an oven; metal framework processing, sand blasting and adhesive brushing; clean the mold, spray and brush the mold release agent on the mold; use polyurethane pouring, put the treated metal framework into the mold, pour the pre-polymer of polyurethane, and then perform solidification treatment after pouring is completed.

[0008] The invention is named "a composite flat screen manufacturing process", the application number is "202010356798.9", the technical solution of the invention patent published is as follows: step one: design the screen pattern according to requirements, and then make a template; step two: select square steel pipes or flat steels according to the template, and weld the square steel pipes or flat steels into a frame structure according to the template pattern; step three: perform injection molding treatment on the frame structure formed in step two, the injection molding material selected during the injection molding treatment is prepared according to a proportion of 70-80% of modified material and 15%-35% of glass fiber, the injection molding material powder is injected into the formed frame structure after preparation is completed, and the frame is completed; step four: filter screen manufacturing, cut the filter screen according to the frame size, and the cut filter screen is ready for use; step five: place the injection-molded frame structure and filter screen structure on a hot melting machine for hot melting treatment, the hot melting treatment is performed at a temperature of 200-245℃, a time of 70-85s, and a normal pressure of 1.0Pa; step six: place the frame structure and filter screen after hot melting treatment in step five in a normal temperature environment for solidification for 60-80s, and then repair the burrs of the fixed filter screen.

[0009] The invention is named "a tool for bonding petroleum vibrating screen cloth and a preparation method thereof", the application number is "202010266106.1", the technical solution of the invention patent published is as follows: first, the surface of the cold-rolled steel plate is subjected to sand blasting treatment; second, the cold-rolled steel plate after sand blasting in the first step is heated, and then Teflon paint is sprayed; third, the steel plate after heating in the second step is cooled to room temperature, and Teflon paint is sprayed after heating; fourth, the steel plate after spraying Teflon in the third step is cooled to room temperature, and then heated, to obtain a tool for bonding petroleum vibrating screen cloth.

[0010] The invention name "vibration screen for oil exploitation and its preparation method", application number "202010284209.0" invention patent published technical scheme is to make the screen into a unified screen plate, which can be replaced according to different needs in use, and the internal screen plate can be fixed in position through the cooperation of the slide plate fixing mechanism, the first limiting block and the second limiting block. The whole vibration screen screen can be replaced in disorder, and the screen and the screen frame are uniformly prepared, so they can be perfectly matched with the machine. Different machines and additional screen frames are not needed. Only by configuring corresponding plate type oil vibration screen screen, wave type oil vibration screen screen and frame type oil vibration screen screen module can the three screens be used alternately, and the soft rubber pad can reduce the direct collision force between the screen frame and the machine.

[0011] The invention name "a preparation method of wave type vibration screen splicing module", application number "202010234550.5" invention patent published technical scheme is to pre-produce a batch of plugging, the shape of the plugging is consistent with the wave valley of the module; according to the required size of the module, the surface net, the lining net and the bottom net are cut, laminated and bonded or pressed into a wave-shaped screen body through rollers or molds; then the side of the bottom net is placed upward, the plugging is coated with adhesive, and the skeleton steel plate is placed on it to press into an integrated splicing module.

[0012] The invention name "vibration screen for oil exploitation and its preparation method", application number "201811625149.3" invention patent published technical scheme is to set a circular arc structure at the bottom of the frame and fit it with the vibration screen, so that the net cloth keeps a flat structure during filtering mud. The preparation method is: step one, using polypropylene material to process frame and end plate by injection molding machine; step two, using flat vulcanizing machine to melt the top of the frame and bond with the net cloth; step three, sealing rubber and fixing the end plate; step four, assembling the end plate and the frame.

[0013] The related technology above relates to a vibrating screen mesh manufacturing process, whether it is a flat composite screen mesh or a wave-shaped composite screen mesh, adopting a specific tooling or injection mold, or a bonding or vulcanization machine vulcanization or polyurethane injection molding, and the filter screen (screen cloth) is manufactured by manual cutting, and none of them involves a pre-tensioning process of determining different tensioning forces according to different mesh counts and different steel wire diameters, and the tensioning force of each layer of screen cloth is difficult to control, resulting in uneven tensioning of each layer of screen cloth, or the tensioning force is too large and the screen cloth is too tight, causing the screen mesh steel wire to yield and damage prematurely, or the screen cloth is not tight enough and the tensioning force is insufficient, and part of the screen cloth is in a relaxed state. Therefore, the vibrating screen mesh manufactured by the prior art method has low manufacturing quality and low efficiency, which affects the performance of the vibrating screen, such as the screening effect, the solid-liquid separation precision, the solid phase migration efficiency, the solid phase dewatering effect, and the like. More importantly, it causes the vibrating screen mesh to be damaged prematurely and the service life to be shortened, thereby affecting the drilling speed, the continuity of the drilling process, and the increase in the consumption of the screen mesh, which leads to an increase in the drilling cost. Practical new type content

[0014] In view of the above technical problems, the utility model aims at putting forward a vibrating screen frame plate type multi-layer composite screen mesh tensioning device which can solve at least one of the above problems.

[0015] The utility model discloses a vibrating screen frame plate type multi-layer composite screen mesh tensioning device which can solve the problem of pre-tensioning of each layer of screen cloth in the vibrating screen mesh manufacturing process, and can realize tensioning of each layer of screen cloth in the vibrating screen frame plate type multi-layer composite screen mesh according to different mesh counts and different screen cloth steel wire diameters. The device overcomes the problem of inaccurate manual winding and tensioning of screen cloth, and can measure and feedback control the tensioning force of screen cloth. The device can ensure that each layer of screen cloth has reasonable elasticity and toughness, and can neither relax nor be over-tensioned. The device can avoid resonance between the screen mesh and the vibrating screen box during use by adjusting the tensioning force, which is beneficial to the operation of the screen mesh in a state far away from resonance. The device can ensure the best screening effect of the vibrating screen, improve the manufacturing quality and service life of the vibrating screen frame plate type multi-layer composite screen mesh, reduce the use cost of the vibrating screen, save the cost of consumable parts, improve the continuous operation efficiency and reliability of the vibrating screen, and has high automation degree, low labor intensity, high screen mesh manufacturing efficiency, simple and convenient installation, operation and maintenance, compact structure, low energy consumption, small occupation area, and meets the requirements of health, safety and environmental protection. The device can be used for applying tensioning force to each layer of screen cloth during the manufacturing process of the vibrating screen frame plate type multi-layer composite screen mesh, and can also be used for applying tensioning force to single-layer screen cloth. The device is not only suitable for the vibrating screen frame plate type multi-layer composite screen mesh manufacturing in the field of petroleum engineering, but also can be applied to the vibrating screen frame plate type multi-layer composite screen mesh manufacturing in other fields, and has wide application prospect and application field.

[0016] The utility model provides a kind of frame plate type multilayer composite screen tensioning device for vibrating screen, including:

[0017] Rack assembly, front cylinder group assembly, front end U-shaped compression plate assembly, screen cloth fixing frame assembly, rear cylinder group assembly, rear end U-shaped compression plate assembly, automatic cutting device, screen cloth guide assembly, first layer screen cloth, first layer screen cloth winding device, second layer screen cloth, second layer screen cloth winding device, third layer screen cloth, third layer screen cloth winding device, control device, hydraulic station, it can be used for vibrating screen frame plate type multilayer composite screen manufacturing process each layer screen cloth respectively to exert tensioning force tensioning, it can also be used for single layer screen cloth to exert tensioning force tensioning;

[0018] Front cylinder group assembly, rear cylinder group assembly are fixedly installed above front support assembly, rear support assembly of rack assembly respectively using connecting bolt through cylinder connecting flange, front cylinder group assembly, rear cylinder group assembly below are connected with front end U-shaped compression plate assembly, rear end U-shaped compression plate assembly respectively through connecting rod, under the drive of cylinder, first end U-shaped compression plate assembly, rear end U-shaped compression plate assembly are moved up and down, to compress or relax screen cloth;

[0019] Screen cloth fixing frame assembly is placed on the upper surface of support platform assembly of rack assembly, for fixing first layer screen cloth, second layer screen cloth, third layer screen cloth that have exerted certain tensioning force tensioning;

[0020] Automatic cutting device is located above screen cloth guide assembly, and is fixedly installed on the track support of right side of rear support assembly through inner hexagon connecting bolt group A, inner hexagon connecting bolt group B, when first layer screen cloth, second layer screen cloth, third layer screen cloth that have been exerted tensioning force tensioning are fixed in screen cloth fixing frame assembly, automatic cutting device can walk along the axial direction above screen cloth guide assembly and automatically cut screen cloth, realize the separation of screen cloth in screen cloth fixing frame assembly and screen cloth on first layer screen cloth winding device, second layer screen cloth winding device, third layer screen cloth winding device;

[0021] Screen cloth guide assembly is located in the right side of rear support assembly of rack assembly, and is fixedly installed on guide shaft support through connecting bolt, for supporting first layer screen cloth, second layer screen cloth, third layer screen cloth and leading into screen cloth fixing frame assembly, simultaneously realize the close and gapless fit between first layer screen cloth, second layer screen cloth, third layer screen cloth;

[0022] First layer screen cloth winding device is located on the first layer screen cloth support frame of rack assembly, and is fixedly installed on first layer screen cloth support frame using connecting bolt, for winding first layer screen cloth of frame plate type multilayer composite screen for vibrating screen;

[0023] The second layer screen cloth winding device is located on the second layer screen cloth support plate of the rack assembly and is fixedly installed on the second layer screen cloth support plate by connecting bolts, and is used for winding the second layer screen cloth of the frame plate type multi-layer composite screen net for a vibrating screen.

[0024] The third layer screen cloth winding device is located on the bottom plate of the rack assembly and is fixedly installed on the bottom plate by connecting bolts, and is used for winding the third layer screen cloth of the frame plate type multi-layer composite screen net for a vibrating screen.

[0025] The control device is installed on the base assembly of the rack assembly, and is used for controlling the starting, running and stopping of the hydraulic station and the automatic cutting device, and controlling the tension of the first layer screen cloth, the second layer screen cloth and the third layer screen cloth.

[0026] The hydraulic station is installed on the base assembly of the rack assembly, and is used for starting, running and stopping the hydraulic cylinders in the front hydraulic cylinder group assembly and the rear hydraulic cylinder group assembly and the hydraulic motor.

[0027] In a preferred embodiment, the frame plate type multi-layer composite screen net for a vibrating screen comprises a first layer screen cloth, a second layer screen cloth, a third layer screen cloth, a screen plate and a screen frame, the mesh number of the first layer screen cloth is higher than that of the second layer screen cloth, the mesh number of the second layer screen cloth is higher than that of the third layer screen cloth, the screen plate is a rectangular thin plate with a thickness of 3-4 mm and has uniformly distributed circular or hexagonal through holes, the screen frame is a square tube welded into a whole, the cross section of the square tube is between 20 mm x 20 mm and 30 mm x 30 mm, the screen plate and the screen frame are welded into a whole, the first layer screen cloth, the second layer screen cloth and the third layer screen cloth which have been tensioned are simultaneously bonded and solidified to the upper surface of the screen plate by using a high-strength adhesive, and the frame plate type multi-layer composite screen net for a vibrating screen is manufactured, which can be widely applied to the field of petroleum and other fields of solid-liquid separation, solid-phase liquid removal drying, liquid-phase recovery, particle screening and grading.

[0028] In a preferred embodiment, the rack assembly comprises a front support assembly, a support platform assembly, a rear support assembly, a rail support, a guide shaft support, a bottom plate, a second layer screen cloth support plate, a first layer screen cloth support frame, a base assembly, a front hydraulic cylinder group assembly, a front end U-shaped pressing plate assembly, a screen cloth fixing frame assembly, a rear hydraulic cylinder group assembly, a rear end U-shaped pressing plate assembly, an automatic cutting device, a screen cloth guide assembly, a first layer screen cloth, a first layer screen cloth winding device, a second layer screen cloth, a second layer screen cloth winding device, a third layer screen cloth, a third layer screen cloth winding device, a control device and a hydraulic station, which are all arranged in the rack assembly and are integrally installed on the base assembly to form a whole.

[0029] In a preferred embodiment, the front cylinder group assembly includes three cylinder assemblies, each including a cylinder, a cylinder connecting flange, and a connecting rod, and the hydraulic station provides hydraulic power to drive the three cylinders to start, extend, and retract synchronously, thereby driving the three front U-shaped pressing plate assemblies through the connecting rods to press the first, second, and third layers of screen cloths into the screen cloth fixing frame assembly.

[0030] In a preferred embodiment, the rear cylinder group assembly has the same structure as the front cylinder group assembly, including three cylinder assemblies, each including a cylinder, a cylinder connecting flange, and a connecting rod, and the hydraulic station provides hydraulic power to drive the three cylinders to start, extend, and retract synchronously, thereby driving the three rear U-shaped pressing plate assemblies through the connecting rods to press the first, second, and third layers of screen cloths into the screen cloth fixing frame assembly.

[0031] In a preferred embodiment, the front U-shaped pressing plate assembly and the rear U-shaped pressing plate assembly have the same structure, each including a pressing plate, a locking nut A, a split pin A, a clamp A, a fixed bolt A, a pin shaft, a shaft retainer, a clamp B, a fixed bolt B, a locking nut B, and a split pin B. The middle part of the pin shaft is fixedly connected to the end of the connecting rod of the cylinder assembly through a transition fit, and the two ends of the pin shaft are fixedly connected to the two sides of the pressing plate through the clamp A and the clamp B using the fixed bolt A and the fixed bolt B, and the two ends of the pin shaft are fixedly locked using the locking nut A, the split pin A, the locking nut B, and the split pin B.

[0032] In a preferred embodiment, the screen cloth fixing frame assembly includes an upper short pressing strip A, an upper long pressing strip A, a fixed bolt, a fixed nut, a lower pressing frame assembly, an upper short pressing strip B, an upper long pressing strip B, a first layer of screen cloth, a second layer of screen cloth, and a third layer of screen cloth. The upper short pressing strip A and the upper short pressing strip B have the same structure and length, and the upper long pressing strip A and the upper long pressing strip B have the same structure and length. The lower surfaces of the upper short pressing strip A and the upper short pressing strip B have concave and convex grooves. The first, second, and third layers of screen cloth are pressed and fixed in the lower pressing frame assembly through 22-28 fixed bolts and fixed nuts, and the first, second, and third layers of screen cloth are always kept in a set tension state.

[0033] The lower pressing frame assembly includes a lower short pressing strip A, a lower long pressing strip A, a lower short pressing strip B, and a lower long pressing strip B, which are sequentially welded into a whole.

[0034] The lower short pressing strip A and the lower short pressing strip B have the same structure and length, and the upper surfaces of the lower short pressing strip A and the lower short pressing strip B are processed with concave and convex grooves, and the lower surfaces are welded with channel steels. The lower short pressing strip A is used with the upper short pressing strip A, and the lower short pressing strip B is used with the upper short pressing strip B.

[0035] The lower long pressing strip A and the lower long pressing strip B are completely same in structure and length, the upper surface is processed with concave-convex grooves, and the lower surface is welded with channel steel.

[0036] In a preferred embodiment, the automatic cutting device comprises a self-walking motor, a cutter, a right walking wheel, a dovetail groove track, an inner hexagonal connecting bolt set A, a left walking wheel, an inner hexagonal connecting bolt set B, the dovetail groove track is fixedly installed on the track support on the right side of the rear support assembly by the inner hexagonal connecting bolt set A and the inner hexagonal connecting bolt set B, the upper surface of the dovetail groove track has two dovetail grooves, the self-walking motor is provided with the right walking wheel and the left walking wheel on the bottom surface, can reciprocate axially on the two dovetail grooves on the upper surface of the dovetail groove track, the output end of the self-walking motor is provided with the cutter, can automatically cut the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth which have been tensioned, and realize the separation of the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth in the screen cloth fixing frame assembly from the first layer of screen cloth winding device, the second layer of screen cloth winding device and the third layer of screen cloth winding device.

[0037] In a preferred embodiment, the screen cloth guide assembly comprises an oil cup A, a bearing cover A, a bolt A, a sealing gasket A, a hole retainer A, a shaft retainer A, a self-aligning roller bearing A, a bearing seat A, a shaft head end plate A, a guide shaft, a bearing seat B, a self-aligning roller bearing B, a shaft retainer B, a hole retainer B, a sealing gasket B, a bolt B, a bearing cover B, an oil cup B, a shaft head end plate B.

[0038] The guide shaft is a hollow straight shaft and is sealed and separated by the shaft head end plate A and the shaft head end plate B at the end faces of both ends, the self-aligning roller bearing A and the self-aligning roller bearing B are respectively installed in the radial direction of both ends of the guide shaft and are placed in the bearing seat A and the bearing seat B, the hole retainer A, the hole retainer B, the shaft retainer A and the shaft retainer B are used for axial fixation, the bearing seat A and the bearing seat B can be injected with lubricating grease through the oil cup A and the oil cup B to lubricate the self-aligning roller bearing A and the self-aligning roller bearing B, and the bearing cover A and the bearing cover B, the sealing gasket A and the sealing gasket B are respectively pressed and fixed to the end faces of the bearing seat A and the bearing seat B by the bolt A and the bolt B at both ends of the guide shaft.

[0039] In a preferred embodiment, the first layer of screen cloth winding device, the second layer of screen cloth winding device, the third layer of screen cloth winding device, structure is exactly the same, all include hydraulic motor, connecting bolt A, fixed bolt A, double headed threaded pin shaft A, ratchet A, ratchet A, bearing seat C, self-aligning roller bearing C, oil cup C, spline, motor support, O type sealing ring A, cover bolt A, bearing end cover A, sealing pad C, hole check ring C, screen cloth winding shaft, bearing seat D, self-aligning roller bearing D, double headed threaded pin shaft B, hole check ring D, sealing pad D, pawl B, tight bolt, torque sensor, connecting bolt B, sensor support, flat key, fixed bolt B, ratchet B, cover bolt B, bearing end cover B, O type sealing ring B, oil cup D;

[0040] The screen cloth winding shaft is a hollow straight shaft, the middle section has a through hole slot C, one end of the two ends is connected with the hydraulic motor by spline, and the other end is connected with the torque sensor by flat key, the starting end of the screen cloth to be tensioned is inserted into the through hole slot C, and the hydraulic motor drives the screen cloth winding shaft to rotate, so that a certain amount of screen cloth can be directly wound on the screen cloth winding shaft and tensioned according to the set torque value and tensioning force.

[0041] The hydraulic motor is connected, fixed and supported with the motor support through 4-6 connecting bolts A;

[0042] The bearing seat C is welded on the same side of the motor support, and the self-aligning roller bearing C installed on the screen cloth winding shaft is arranged in the bearing seat C;

[0043] 3-4 oil cups C are installed on the right side of the bearing seat C, lubricating grease is injected into the bearing seat C through the oil cup C, so as to lubricate the self-aligning roller bearing C, the hole check ring C is arranged in the bearing seat C to fix the self-aligning roller bearing C in the radial direction, and the O type sealing ring A and the sealing pad C are arranged in the bearing end cover A on the left side of the bearing seat C to seal the end face and axial direction, and the bearing end cover A is tightly fixed on the left side end face of the bearing seat C through 6-8 cover bolts A;

[0044] The ratchet A is arranged between the bearing end cover A and the motor support, and is sleeved and fixed on the tail end of the screen cloth winding shaft through the fixed bolt A, the pawl A matched with the ratchet A is sleeved on one end of the double headed threaded pin shaft A, and the other end of the double headed threaded pin shaft A is fixed on the upper side of the bearing seat C through a nut;

[0045] The torque sensor is sleeved and connected on the end of the screen cloth winding shaft through the flat key and is fixed through the tight bolt, the end face of the torque sensor is fixed and installed on the sensor support through 4-6 connecting bolts B, the torque value on the screen cloth winding shaft can be measured in real time and transmitted to the control device, compared with the set value, as a feedback control signal to control the output flow and pressure of the hydraulic station, so as to control the output torque of the hydraulic motor, thereby controlling the tensioning force of the screen cloth to be tensioned;

[0046] The same side direction of the sensor support seat is welded with a bearing seat D, and a self-aligning roller bearing D installed on the screen cloth winding shaft is placed in the bearing seat D;

[0047] 3-4 oil cups D are installed on the left side of the bearing seat D, and the bearing seat D is injected with lubricating grease through the oil cup D to lubricate the self-aligning roller bearing D. There are holes in the bearing seat D, and a retainer D is used to radially fix the self-aligning roller bearing D. The right side of the bearing seat D is provided with an O-shaped sealing ring B and a sealing gasket D in the bearing end cover B for end face and axial sealing, and the bearing end cover B is tightly fixed to the right side end face of the bearing seat D through 6-8 cover plate bolts B;

[0048] The ratchet B is placed between the bearing end cover B and the torque sensor, and is fixed on the screen cloth winding shaft tail end through a fixing bolt B. The pawl B used in cooperation with the ratchet B is sleeved on one end of a double-headed threaded pin shaft B, and the other end of the double-headed threaded pin shaft B is fixed to the upper side of the bearing seat D through a nut.

[0049] In a preferred embodiment, according to the utility model, a kind of frame plate type multilayer composite screen net tensioning method for vibrating screen is also provided, using a kind of frame plate type multilayer composite screen net tensioning device provided according to the utility model, comprising the following steps:

[0050] Step S1: the starting end of the first layer screen cloth, the second layer screen cloth, the third layer screen cloth in width direction to be tensioned is respectively inserted into the screen cloth winding shaft through-hole slot C of the first layer screen cloth winding device, the second layer screen cloth winding device, the third layer screen cloth winding device;

[0051] Step S2: start the control device to run, and start the hydraulic station to run by the control device control;

[0052] Step S3: the hydraulic station provides certain pressure and flow rate of hydraulic power oil to the hydraulic motor of the first layer screen cloth winding device, the second layer screen cloth winding device, the third layer screen cloth winding device respectively, drives the hydraulic motor to rotate at low speed with the screen cloth winding shaft, and a certain amount of the first layer screen cloth, the second layer screen cloth, the third layer screen cloth to be tensioned can be directly wound on the screen cloth winding shaft of the first layer screen cloth winding device, the second layer screen cloth winding device, the third layer screen cloth winding device respectively;

[0053] Step S4: place the lower pressing frame assembly on the upper surface of the support platform assembly of the rack assembly;

[0054] Step S5: the first layer screen cloth, the second layer screen cloth, the third layer screen cloth in width direction front end are simultaneously pulled and introduced into the lower pressing frame assembly of the screen cloth fixing frame assembly through the screen cloth guide assembly, until reaching the concave-convex groove of the lower short pressing strip A;

[0055] Step S6: Place the upper short pressing strip A above the lower short pressing strip A of the lower pressing frame assembly, and use the weight of the upper short pressing strip A and the concave-convex groove to preliminarily press and fix the front end of the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth;

[0056] Step S7: Start the hydraulic station to provide hydraulic power to drive the 3 groups of front cylinder groups to start and extend synchronously, so that the 3 groups of front end U-shaped pressing plate assemblies are driven by the connecting rods to move downward until the pressing plates are in complete contact with the upper short pressing strip A, and under the action of hydraulic power and the cylinders, the front end of the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth are further completely pressed and fixed in the concave-convex groove of the upper short pressing strip A and the lower short pressing strip A;

[0057] Step S8: Use 8-12 fixed bolts and fixed nuts to completely lock and fix the upper short pressing strip A, the lower short pressing strip A and the front end of the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth together;

[0058] Step S9: According to the mesh number of the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth, set the tension force and torque value required for tensioning different screen cloths, and use the control device to control the hydraulic station to provide different pressure and flow of hydraulic power oil to the hydraulic motor of the third layer of screen cloth winding device, the second layer of screen cloth winding device and the first layer of screen cloth winding device in turn, and the hydraulic motor drives the screen cloth winding shaft to rotate, and the third layer of screen cloth, the second layer of screen cloth and the first layer of screen cloth are tensioned in turn. The actual torque value of the screen cloth winding shaft on the third layer of screen cloth winding device, the second layer of screen cloth winding device and the first layer of screen cloth winding device can be measured in real time by the torque sensor and transmitted to the control device, and compared with the set value as a feedback control signal to control the output flow and pressure of the hydraulic station to control the output torque of the hydraulic motor, so that the third layer of screen cloth, the second layer of screen cloth and the first layer of screen cloth reach the set tension force value for tensioning, and the screen cloth remains in the tensioned state, and the hydraulic motor no longer drives the screen cloth winding shaft to rotate;

[0059] Step S10: Rotate the pawl A and the pawl B of the third layer of screen cloth winding device, the second layer of screen cloth winding device and the first layer of screen cloth winding device to the ratchet A and the ratchet B, so as to mechanically lock the screen cloth winding shaft in the third layer of screen cloth winding device, the second layer of screen cloth winding device and the first layer of screen cloth winding device from rotating again by relying on the pawl and the ratchet, and make the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth still in the set tension force tensioned state;

[0060] Step S11: Place the upper short pressing strip B above the lower short pressing strip B of the lower pressing frame assembly;

[0061] Step S12: start the hydraulic station to provide hydraulic power to drive the 3 groups of rear cylinder synchronous start, stretch out, so as to drive the 3 groups of rear U-shaped pressing plate assembly downward through the connecting rod, until the pressing plate is in complete contact with the upper short pressing strip B, and under the action of hydraulic power and cylinder, the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth are completely pressed and fixed in the concave-convex groove of the upper short pressing strip B and the lower short pressing strip B;

[0062] Step S13: use 4-6 fixed bolts and fixed nuts to completely lock and fix the upper short pressing strip B, the lower short pressing strip B and the rear end of the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth together, so that the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth can still be tensioned according to the set tension in the width direction;

[0063] Step S14: place the upper long pressing strip A and the upper long pressing strip B on the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth respectively on the upper surface concave-convex groove of the lower long pressing strip A and the lower long pressing strip B of the lower pressing frame assembly;

[0064] Step S15: use 14-16 fixed bolts and fixed nuts to completely lock and fix the upper long pressing strip A and the lower long pressing strip A and the upper long pressing strip B and the lower long pressing strip B with the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth on both sides in the concave-convex groove, so that the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth can still be tensioned according to the set tension in the length direction;

[0065] Step S16: the control device controls the hydraulic motor of the third layer of screen cloth winding device, the second layer of screen cloth winding device and the first layer of screen cloth winding device to return oil and release pressure, and the hydraulic motor stops running;

[0066] Step S17: the control device starts the self-propelled motor of the automatic cutting device to run, the self-propelled motor drives the right walking wheel and the left walking wheel below it to move forward along the two dovetail grooves on the upper surface of the dovetail groove track, and the cutter installed at the output end of the self-propelled motor automatically cuts the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth which have been tensioned, realizes the separation of the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth in the screen cloth fixing frame assembly from the first layer of screen cloth winding device, the second layer of screen cloth winding device and the third layer of screen cloth winding device, then the automatic cutting device returns to the starting position, and the self-propelled motor of the automatic cutting device stops running under the control of the control device;

[0067] Step S18: rotate the pawl A and the pawl B of the first layer of screen cloth winding device, the second layer of screen cloth winding device and the third layer of screen cloth winding device, away from the ratchet A and the ratchet B, so that the first layer of screen cloth, the second layer of screen cloth and the third layer of screen cloth on the first layer of screen cloth winding device, the second layer of screen cloth winding device and the third layer of screen cloth winding device return to the natural relaxed state.

[0068] Step S19: The control device controls the synchronous starting and retracting of the three groups of hydraulic cylinders in the front hydraulic cylinder group assembly through the hydraulic station, thereby driving the three groups of front U-shaped pressing plate assemblies to move upward through the connecting rods until they return to the initial position.

[0069] Step S20: The control device controls the synchronous starting and retracting of the three groups of hydraulic cylinders in the rear hydraulic cylinder group assembly through the hydraulic station, thereby driving the three groups of rear U-shaped pressing plate assemblies to move upward through the connecting rods until they return to the initial position.

[0070] Step S21: The screen fixing frame assembly with the screen layers tensioned according to the set tensioning force is removed from the rack assembly, and the first layer of screen, the second layer of screen, and the third layer of screen in the tensioned state are simultaneously bonded and solidified to the upper surface of the screen plate using high-strength adhesive and other screen bonding tools, thereby manufacturing the frame plate type multi-layer composite screen for vibrating screen with tensioning force, and then loosening the fixing bolts and the fixing nuts to separate the first layer of screen, the second layer of screen, the third layer of screen, and the upper short pressing strip A, the upper long pressing strip A, the upper short pressing strip B, and the upper long pressing strip B from the lower pressing frame assembly.

[0071] Step S22: Steps S4-S21 are repeated to manufacture the next frame plate type multi-layer composite screen for vibrating screen with tensioning force.

[0072] Compared with the prior art, the present application has at least the following advantages:

[0073] The utility model discloses to frame board formula multilayer composite screen net tensioner for vibrating screen according to the prior art's problem, provide, using according to the utility model still provides a kind of frame board formula multilayer composite screen net tensioning method for vibrating screen, can according to different mesh cloth, different screen cloth steel wire diameter size, realize that frame board formula multilayer composite screen net for vibrating screen each layer screen cloth is according to respective set tensioning force value tensioning;Overcome the problem that screen cloth is manually wound, screen cloth tensioning force is not accurate, cannot measure and cannot feedback control, ensure that each layer screen cloth has reasonable elasticity and tenacity, neither slack, also cannot be over-tensioned;Because screen inherent frequency is directly proportional to the square root of tensioning force, can avoid resonance area by adjusting tensioning force size, it is favorable for screen to work in far from resonance state, it is favorable for guaranteeing the best screening effect of vibrating screen;It can improve the manufacturing quality and service life of frame board formula multilayer composite screen net for vibrating screen, save vibrating screen use cost and easily damaged part expense;It improves the continuous operation efficiency and reliability of vibrating screen;Prevent the solid phase separated in the process of solid-liquid separation and screening of vibrating screen from gathering into group in the migration process on screen cloth surface, ensure the correctness of solid phase migration track, further improve the screening effect, screening precision and solid phase migration efficiency of vibrating screen;Device adopts hydraulic system and automatic control, degree of automation is high, labor intensity is light, screen manufacturing efficiency is high;Device installation, operation, maintenance are simple, convenient, fast;System structure is compact, energy consumption is low, occupies small area, satisfies health, safety, environmental protection requirement;It can be used for vibrating screen frame board formula multilayer composite screen net manufacturing process each layer screen cloth respectively to apply tensioning force tensioning, also can be used for single layer screen cloth to apply tensioning force tensioning;Using the device and method, frame board formula multilayer composite screen net for vibrating screen manufactured, not only be applicable to petroleum engineering field also can be applied to other fields' solid-liquid separation, solid phase liquid removal drying, particle screening, particle classification etc. occasion, has wide popularization and application prospect and applicable field. BRIEF DESCRIPTION OF DRAWINGS

[0074] The utility model will be described below with reference to the drawings.

[0075] Figure 1 A front view schematic diagram of one embodiment of a frame board formula multilayer composite screen net tensioner for vibrating screen according to the utility model is shown.

[0076] Figure 2 A top view schematic diagram of one embodiment of a frame board formula multilayer composite screen net tensioner for vibrating screen according to the utility model is shown.

[0077] Figure 3 A front view schematic diagram of one embodiment of a frame board formula multilayer composite screen net tensioner for vibrating screen according to the utility model is shown. Figure 1 A section schematic diagram in A-A direction.

[0078] Figure 4 A frame assembly schematic diagram according to the utility model is shown.

[0079] Figure 5 A schematic diagram of a liquid cylinder assembly according to the present application is shown;

[0080] Figure 6a A schematic diagram of a U-shaped pressing plate assembly according to the present application is shown;

[0081] Figure 6b A schematic diagram of a U-shaped pressing plate assembly according to the present application is shown;

[0082] Figure 7a A schematic diagram of a screen cloth fixing frame assembly according to the present application is shown;

[0083] Figure 7b A schematic diagram of a screen cloth fixing frame assembly according to the present application is shown;

[0084] Figure 8 A schematic diagram of an upper short pressing strip according to the present application is shown;

[0085] Figure 9 A schematic diagram of an upper long pressing strip according to the present application is shown;

[0086] Figure 10a A schematic diagram of a lower pressing frame assembly according to the present application is shown;

[0087] Figure 10b A schematic diagram of a lower pressing frame assembly according to the present application is shown;

[0088] Figure 11a A schematic diagram of a lower long pressing strip according to the present application is shown;

[0089] Figure 11b A schematic diagram of a lower long pressing strip according to the present application is shown;

[0090] Figure 11c A schematic diagram of a structure in the N direction in Figure 11a is shown;

[0091] Figure 12a A schematic diagram of a lower short pressing strip according to the present application is shown;

[0092] Figure 12b A schematic diagram of a lower short pressing strip according to the present application is shown;

[0093] Figure 12c A schematic diagram of a structure in the W direction in Figure 12a is shown;

[0094] Figure 13a A schematic diagram of an automatic cutting device according to the present application is shown;

[0095] Figure 13b A top view schematic diagram of the automatic cutting device according to the present application is shown;

[0096] Figure 14 A screen cloth guiding assembly schematic diagram according to the present application is shown;

[0097] Figure 15a A front view schematic diagram of the screen cloth winding device according to the present application is shown;

[0098] Figure 15b A P view schematic diagram of the screen cloth winding device according to the present application is shown;

[0099] Figure 16 A frame plate type multi-layer composite screen mesh for a vibrating screen according to the present application is shown.

[0100] The reference signs in the drawings are as follows:

[0101] 100, Frame plate type multi-layer composite screen tensioning device for vibrating screen; 1, Frame assembly; 2, Front cylinder group assembly; 3, Front end U-shaped pressing plate assembly; 4, Screen cloth fixing frame assembly; 5, Rear cylinder group assembly; 6, Rear end U-shaped pressing plate assembly; 7, Automatic cutting device; 8, Screen cloth guide assembly; 9, First layer screen cloth; 10, First layer screen cloth winding device; 11, Second layer screen cloth; 12, Second layer screen cloth winding device; 13, Third layer screen cloth; 14, Third layer screen cloth winding device; 15, Control device; 16, Hydraulic station; 17, Screen plate; 18, Screen frame; 101, Front support assembly; 102, Support platform assembly; 103, Rear support assembly; 104, Track support; 105, Guide shaft support; 106, Bottom plate; 107, Second layer screen cloth support plate; 108, First layer screen cloth support frame; 109, Base assembly; 201, Hydraulic cylinder; 202, Hydraulic cylinder connecting flange; 203, Connecting rod; 301, Pressing plate; 302, Locking nut A; 303, Split pin A; 304, Clamp A; 305, Fixed bolt A; 306, Pin shaft; 307, Shaft check ring; 308, Clamp B; 309, Fixed bolt B; 310, Locking nut B; 311, Split pin B; 401, Upper short pressing strip A; 402, Upper long pressing strip A; 403, Fixed bolt; 404, Fixed nut; 405, Lower pressing frame assembly; 406, Upper short pressing strip B; 407, Upper long pressing strip B; 701, Self-propelled motor; 702, Cutter; 703, Right walking wheel; 704, Dovetail groove track; 705, Inner hexagonal connecting bolt set A; 706, Left walking wheel; 707, Inner hexagonal connecting bolt set B; 801, Oil cup A; 802, Bearing cover A; 803, Bolt A; 804, Gasket A; 805, Hole check ring A; 806, Shaft check ring A; 807, Self-aligning roller bearing A; 808, Bearing seat A; 809, Shaft head end plate A; 810, Guide shaft; 811, Bearing seat B; 812, Self-aligning roller bearing B; 813, Shaft check ring B; 814, Hole check ring B; 815, Gasket B; 816, Bolt B; 817, Bearing cover B; 818, Oil cup B; 819, Shaft head end plate B; 1001, Hydraulic motor; 1002, Connecting bolt A; 1003, Fixed bolt A; 1004, Double-threaded pin shaft A; 1005, Pawl A; 1006, Ratchet wheel A; 1007, Bearing seat C; 1008, Self-aligning roller bearing C; 1009, Oil cup C; 1010, Spline; 1011, Motor support seat; 1012, O-ring A; 1013, Cover plate bolt A; 1014, Bearing end cover A; 1015, Gasket C; 1016, Hole check ring C; 1017, Screen cloth winding shaft; 1018, Bearing seat D; 1019, Self-aligning roller bearing D; 1020, Double-threaded pin shaft B; 1021, Hole check ring D; 1022, Gasket D; 1023, Pawl B; 1024, Set screw; 1025, Torque sensor;1026, connecting bolt B; 1027, sensor support seat; 1028, flat key; 1029, fixing bolt B; 1030, ratchet B; 1031, cover plate bolt B; 1032, bearing end cover B; 1033, O-shaped sealing ring B; 1034, oil cup D; 4051, lower short pressing strip A; 4052, lower long pressing strip A; 4053, lower short pressing strip B; 4054, lower long pressing strip B.

[0102] In the present application, all the drawings are schematic drawings, which are only used to illustrate the principles of the utility model and are not drawn according to the actual proportion. DETAILED DESCRIPTION

[0103] The utility model will be introduced below by means of the drawings.

[0104] Figure 1 The structure of the frame plate type multilayer composite screen mesh tensioning device 100 for a vibrating screen according to the utility model is shown. Figure 1 As shown in the figure, the frame plate type multilayer composite screen mesh tensioning device 100 for a vibrating screen comprises a rack assembly 1, a front hydraulic cylinder group assembly 2, a front end U-shaped pressing plate assembly 3, a screen cloth fixing frame assembly 4, a rear hydraulic cylinder group assembly 5, a rear end U-shaped pressing plate assembly 6, an automatic cutting device 7, a screen cloth guide assembly 8, a first layer of screen cloth 9, a first layer of screen cloth winding device 10, a second layer of screen cloth 11, a second layer of screen cloth winding device 12, a third layer of screen cloth 13, a third layer of screen cloth winding device 14, a control device 15 and a hydraulic station 16, which can be used to respectively apply tensioning force to each layer of screen cloth during the manufacturing process of the frame plate type multilayer composite screen mesh for a vibrating screen and can also be used to apply tensioning force to a single layer of screen cloth.

[0105] Example one:

[0106] The front hydraulic cylinder group assembly 2 and the rear hydraulic cylinder group assembly 5 are respectively fixedly installed above the front support assembly 101 and the rear support assembly 103 of the rack assembly 1 by means of the connecting bolt through the hydraulic cylinder connecting flange 202, and the front hydraulic cylinder group assembly 2 and the rear hydraulic cylinder group assembly 5 are respectively connected with the front end U-shaped pressing plate assembly 3 and the rear end U-shaped pressing plate assembly 6 through the connecting rod 203 below, and under the driving of the hydraulic cylinder 201, the front end U-shaped pressing plate assembly 3 and the rear end U-shaped pressing plate assembly 6 are driven to move up and down, so as to press or relax the screen cloth;

[0107] In the present embodiment, the screen cloth fixing frame assembly 4 is placed on the upper surface of the support platform assembly 102 of the rack assembly 1, which is used to fix the first layer of screen cloth 9, the second layer of screen cloth 11 and the third layer of screen cloth 13 in the tensioning state after tensioning force is applied.

[0108] In the embodiment, the automatic cutting device 7 is located above the screen cloth guide assembly 8 and is fixedly installed on the track support 104 on the right side of the rear support assembly 103 of the rack assembly 1 through the inner hexagonal connecting bolt set A 705 and the inner hexagonal connecting bolt set B 707. After the first layer of screen cloth 9, the second layer of screen cloth 11, and the third layer of screen cloth 13, which have been tensioned by tensioning force, are fixed in the screen cloth fixing frame assembly 4, the automatic cutting device 7 can automatically cut the screen cloth while walking axially above the screen cloth guide assembly 8, so as to realize the separation of the screen cloth in the screen cloth fixing frame assembly 4 from the first layer of screen cloth winding device 10, the second layer of screen cloth winding device 12, and the third layer of screen cloth winding device 14.

[0109] In the embodiment, the screen cloth guide assembly 8 is located on the right side of the rear support assembly 103 of the rack assembly 1 and is fixedly installed on the guide shaft support 105 through connecting bolts, so as to support the first layer of screen cloth 9, the second layer of screen cloth 11, and the third layer of screen cloth 13 and guide them into the screen cloth fixing frame assembly 4, while realizing the close and gapless fit between the first layer of screen cloth 9, the second layer of screen cloth 11, and the third layer of screen cloth 13.

[0110] In the embodiment, the first layer of screen cloth winding device 10 is located on the first layer of screen cloth support frame 108 of the rack assembly 1 and is fixedly installed on the first layer of screen cloth support frame 108 through connecting bolts, so as to wind the first layer of screen cloth 9 of the frame plate type multi-layer composite screen mesh for a vibrating screen.

[0111] In the embodiment, the second layer of screen cloth winding device 12 is located on the second layer of screen cloth support plate 107 of the rack assembly 1 and is fixedly installed on the second layer of screen cloth support plate 107 through connecting bolts, so as to wind the second layer of screen cloth 11 of the frame plate type multi-layer composite screen mesh for a vibrating screen.

[0112] In the embodiment, the third layer of screen cloth winding device 14 is located on the bottom plate 106 of the rack assembly 1 and is fixedly installed on the bottom plate 106 through connecting bolts, so as to wind the third layer of screen cloth 13 of the frame plate type multi-layer composite screen mesh for a vibrating screen.

[0113] In the embodiment, the control device 15 is installed on the base assembly 109 of the rack assembly 1, so as to control the start, operation, and stop of the hydraulic station 16 and the automatic cutting device 7 and control the real-time tension of the first layer of screen cloth 9, the second layer of screen cloth 11, and the third layer of screen cloth 13.

[0114] In the embodiment, the hydraulic station 16 is installed on the base assembly 109 of the rack assembly 1, so as to control the start, operation, and stop of the front cylinder group assembly 2, the rear cylinder group assembly 5, the hydraulic cylinder 201, and the hydraulic motor 1001.

[0115] In a specific embodiment, the first layer of screen cloth 9, the second layer of screen cloth 11, the third layer of screen cloth 13, the screen plate 17, the screen frame 18, the first layer of screen cloth 9 has a higher mesh count than the second layer of screen cloth 11, the second layer of screen cloth 11 has a higher mesh count than the third layer of screen cloth 13, the screen plate 17 is a rectangular thin plate with a thickness of 3-4mm and has uniformly distributed circular or hexagonal through holes, the screen frame 18 is a square tube with a square cross section, the square tube cross section size is between 20mm x 20mm and 30mm x 30mm, the screen plate 17 and the screen frame 18 are welded together as a whole, the first layer of screen cloth 9, the second layer of screen cloth 11, and the third layer of screen cloth 13 in a state of tension after being applied with tension are simultaneously bonded and solidified to the upper surface of the screen plate 17 by using high-strength adhesive, thereby manufacturing a frame plate type multi-layer composite screen for a vibrating screen, which can be widely used in the field of petroleum and other fields for solid-liquid separation, solid-phase liquid removal and drying, liquid-phase recovery, and particle screening and grading.

[0116] In a specific embodiment, the rack assembly 1 includes a front support assembly 101, a support platform assembly 102, a rear support assembly 103, a track support 104, a guide shaft support 105, a bottom plate 106, a second layer of screen cloth support plate 107, a first layer of screen cloth support frame 108, a base assembly 109, a front cylinder group assembly 2, a front end U-shaped compression plate assembly 3, a screen cloth fixing frame assembly 4, a rear cylinder group assembly 5, a rear end U-shaped compression plate assembly 6, an automatic cutting device 7, a screen cloth guide assembly 8, a first layer of screen cloth 9, a first layer of screen cloth winding device 10, a second layer of screen cloth 11, a second layer of screen cloth winding device 12, a third layer of screen cloth 13, a third layer of screen cloth winding device 14, a control device 15, and a hydraulic station 16, all of which are placed in the rack assembly 1 and are integrated and installed on the base assembly 109 to form a whole.

[0117] In a specific embodiment, the front cylinder group assembly 2 includes three cylinder assemblies, each cylinder assembly includes a cylinder 201, a cylinder connecting flange 202, and a connecting rod 203, the three cylinders 201 are driven by the hydraulic station 16 to start, extend, and retract synchronously, thereby driving the three front end U-shaped compression plate assemblies 3 through the connecting rods 203 to compress the first layer of screen cloth 9, the second layer of screen cloth 11, and the third layer of screen cloth 13 into the screen cloth fixing frame assembly 4.

[0118] In a specific embodiment, the rear cylinder group assembly 5 has the same structure as the front cylinder group assembly 2, including three cylinder assemblies, each cylinder assembly includes a cylinder 201, a cylinder connecting flange 202, and a connecting rod 203, the three cylinders 201 are driven by the hydraulic station 16 to start, extend, and retract synchronously, thereby driving the three rear end U-shaped compression plate assemblies 6 through the connecting rods 203 to compress the first layer of screen cloth 9, the second layer of screen cloth 11, and the third layer of screen cloth 13 into the screen cloth fixing frame assembly 4.

[0119] In a specific embodiment, the front end U-shaped compression plate assembly 3 and the rear end U-shaped compression plate assembly 6 are completely identical in structure, each of which comprises a compression plate 301, a locking nut A 302, a split pin A 303, a clamp A 304, a fixing bolt A 305, a pin shaft 306, a shaft check ring 307, a clamp B 308, a fixing bolt B 309, a locking nut B 310, a split pin B 311, the middle part of the pin shaft 306 is fixedly connected to the end of the connecting rod 203 in the hydraulic cylinder assembly by transition fit, the two ends of the pin shaft 306 are fixedly connected to the two sides of the compression plate 301 by the clamp A 304 and the clamp B 308 through the fixing bolt A 305 and the fixing bolt B 309, and the two ends of the pin shaft 306 are fixedly locked by the locking nut A 302, the split pin A 303, the locking nut B 310 and the split pin B 311.

[0120] In a specific embodiment, the screen cloth fixing frame assembly 4 comprises an upper short pressing strip A 401, an upper long pressing strip A 402, a fixing bolt 403, a fixing nut 404, a lower compression frame assembly 405, an upper short pressing strip B 406, an upper long pressing strip B 407, a first layer of screen cloth 9, a second layer of screen cloth 11 and a third layer of screen cloth 13, the upper short pressing strip A 401 and the upper short pressing strip B 406 are completely identical in structure and length, the upper long pressing strip A 402 and the upper long pressing strip B 407 are completely identical in structure and length, the lower surfaces of the upper short pressing strip A 401 and the upper short pressing strip B 406 are provided with concave and convex grooves, the first layer of screen cloth 9, the second layer of screen cloth 11 and the third layer of screen cloth 13 are fixedly compressed in the lower compression frame assembly 405 by 22-28 fixing bolts 403 and fixing nuts 404, and the first layer of screen cloth 9, the second layer of screen cloth 11 and the third layer of screen cloth 13 are always kept in a set tension state;

[0121] In the embodiment, the lower compression frame assembly 405 comprises a lower short pressing strip A 4051, a lower long pressing strip A 4052, a lower short pressing strip B 4053 and a lower long pressing strip B 4054, which are sequentially welded into a whole.

[0122] In the embodiment, the lower short pressing strip A 4051 and the lower short pressing strip B 4053 are completely identical in structure and length, the upper surfaces thereof are provided with concave and convex grooves, and the lower surfaces thereof are welded with channel steels, the lower short pressing strip A 4051 is used in combination with the upper short pressing strip A 401, and the lower short pressing strip B 4053 is used in combination with the upper short pressing strip B 406.

[0123] In the embodiment, the lower long pressing strip A 4052 and the lower long pressing strip B 4054 are completely identical in structure and length, the upper surfaces thereof are provided with concave and convex grooves, and the lower surfaces thereof are welded with channel steels, the lower long pressing strip A 4052 is used in combination with the upper long pressing strip A 402, and the lower long pressing strip B 4054 is used in combination with the upper long pressing strip B 407.

[0124] In a specific embodiment, the automatic cutting device 7 comprises a self-propelled motor 701, a cutting knife 702, a right walking wheel 703, a dovetail groove track 704, an inner hexagonal connecting bolt set A 705, a left walking wheel 706, an inner hexagonal connecting bolt set B 707, the dovetail groove track 704 is fixedly installed on the track support 104 on the right side of the rear support assembly 103 by the inner hexagonal connecting bolt set A 705 and the inner hexagonal connecting bolt set B 707, the upper surface of the dovetail groove track 704 has two dovetail grooves, the self-propelled motor 701 is installed with the right walking wheel 703 and the left walking wheel 706 on the bottom surface, can reciprocate axially in the two dovetail grooves on the upper surface of the dovetail groove track 704 above the screen cloth guide assembly 8, the cutting knife 702 is installed on the output end of the self-propelled motor 701, can automatically cut the first layer of screen cloth 9, the second layer of screen cloth 11 and the third layer of screen cloth 13 which have been tensioned by tensioning force at the same time, realizes the separation of the screen cloth in the screen cloth fixing frame assembly 4 and the screen cloth on the first layer of screen cloth winding device 10, the second layer of screen cloth winding device 12 and the third layer of screen cloth winding device 14.

[0125] In a specific embodiment, the screen cloth guide assembly 8 comprises an oil cup A 801, a bearing cover A 802, a bolt A 803, a sealing gasket A 804, a hole retainer A 805, an axle retainer A 806, a self-aligning roller bearing A 807, a bearing seat A 808, an axle head end plate A 809, a guide shaft 810, a bearing seat B 811, a self-aligning roller bearing B 812, an axle retainer B 813, a hole retainer B 814, a sealing gasket B 815, a bolt B 816, a bearing cover B 817, an oil cup B 818, an axle head end plate B 819.

[0126] In this embodiment, the guide shaft 810 is a hollow straight shaft and is sealed and separated by the axle head end plate A 809 and the axle head end plate B 819 at the end of the two end surfaces, the self-aligning roller bearing A 807 and the self-aligning roller bearing B 812 are respectively installed in the radial direction of the two ends of the guide shaft 810 and are placed in the bearing seat A 808 and the bearing seat B 811, the hole retainer A 805, the hole retainer B 814, the axle retainer A 806 and the axle retainer B 813 are used for axial fixation, the bearing seat A 808 and the bearing seat B 811 can be injected with lubricating grease through the oil cup A 801 and the oil cup B 818, so as to lubricate the self-aligning roller bearing A 807 and the self-aligning roller bearing B 812, the bearing cover A 802 and the bearing cover B 817, the sealing gasket A 804 and the sealing gasket B 815 are respectively pressed and fixed to the end surface of the bearing seat A 808 and the bearing seat B 811 by the bolt A 803 and the bolt B 816.

[0127] In a specific embodiment, the first layer screen cloth winding device 10, the second layer screen cloth winding device 12, the third layer screen cloth winding device 14 are completely the same in structure, and each comprises a hydraulic motor 1001, a connecting bolt A 1002, a fixing bolt A 1003, a double-threaded pin shaft A 1004, a pawl A 1005, a ratchet A 1006, a bearing seat C 1007, a self-aligning roller bearing C 1008, an oil cup C 1009, a spline 1010, a motor support seat 1011, an O-shaped sealing ring A 1012, a cover plate bolt A 1013, a bearing end cover A 1014, a sealing gasket C 1015, a hole check ring C 1016, a screen cloth winding shaft 1017, a bearing seat D 1018, a self-aligning roller bearing D 1019, a double-threaded pin shaft B 1020, a hole check ring D 1021, a sealing gasket D 1022, a pawl B 1023, a clamping bolt 1024, a torque sensor 1025, a connecting bolt B 1026, a sensor support seat 1027, a flat key 1028, a fixing bolt B 1029, a ratchet B 1030, a cover plate bolt B 1031, a bearing end cover B 1032, an O-shaped sealing ring B 1033, an oil cup D 1034;

[0128] In the embodiment, the screen cloth winding shaft 1017 is a hollow straight shaft, the middle section has a through hole groove C, one end of the two ends is connected with the hydraulic motor 1001 through the spline 1010, and the other end is connected with the torque sensor 1025 through the flat key 1028, the starting end of the screen cloth to be tensioned is inserted into the through hole groove C, and the hydraulic motor 1001 drives the screen cloth winding shaft 1017 to rotate, so that a certain amount of screen cloth can be directly wound on the screen cloth winding shaft 1017 and tensioned according to the set torque value and tension;

[0129] In the embodiment, the hydraulic motor 1001 is connected, fixed and supported with the motor support seat 1011 through 4-6 connecting bolts A 1002;

[0130] In the embodiment, the bearing seat C 1007 is welded on the same side of the motor support seat 1011, and the self-aligning roller bearing C 1008 installed on the screen cloth winding shaft 1017 is arranged in the bearing seat C 1007;

[0131] In the embodiment, 3-4 oil cups C 1009 are installed on the right side of the bearing seat C 1007, lubricating grease is injected into the bearing seat C 1007 through the oil cup C 1009, so as to lubricate the self-aligning roller bearing C 1008, the hole check ring C 1016 is arranged in the bearing seat C 1007 to fix the self-aligning roller bearing C 1008 in the radial direction, and the O-shaped sealing ring A 1012 and the sealing gasket C 1015 are arranged in the bearing end cover A 1014 on the left side of the bearing seat C 1007 to seal the end face and the axial direction, and the bearing end cover A 1014 is tightly fixed to the left side end face of the bearing seat C 1007 through 6-8 cover plate bolts A 1013;

[0132] In the embodiment, the ratchet wheel A1006 is placed between the bearing end cover A1014 and the motor support base 1011, and is fixed on the screen cloth winding shaft 1017 tail end by the fixing bolt A1003. The pawl A1005 matched with the ratchet wheel A1006 is sleeved on one end of the double-headed threaded pin shaft A1004, and the other end of the double-headed threaded pin shaft A1004 is fixed on the bearing seat C1007 above by a nut.

[0133] In the embodiment, the torque sensor 1025 is sleeved and connected on the screen cloth winding shaft 1017 tail end by the flat key 1028 and is fixed by the set screw 1024. The end face of the torque sensor 1025 is fixed and installed on the sensor support base 1027 by 4-6 connecting bolts B1026. The torque value on the screen cloth winding shaft 1017 can be measured in real time and transmitted to the control device 15. After comparison with the set value, it is used as a feedback control signal to control the output flow and pressure of the hydraulic station 16 to control the output torque of the hydraulic motor 1001, so as to control the tensioning force of the screen cloth to be tensioned.

[0134] In the embodiment, the bearing seat D1018 is directionally welded on the same side of the sensor support base 1027. The plummer block bearing D1019 installed on the screen cloth winding shaft 1017 is placed in the bearing seat D1018.

[0135] In the embodiment, 3-4 oil cups D1034 are installed on the left side of the bearing seat D1018. The lubricating grease is injected into the bearing seat D1018 through the oil cup D1034, so as to lubricate the plummer block bearing D1019. The hole in the bearing seat D1018 uses the retainer D1021 to fix the plummer block bearing D1019 in the radial direction. The O-shaped sealing ring B1033 and the sealing gasket D1022 in the bearing end cover B1032 on the right side of the bearing seat D1018 perform end face and axial sealing, and the bearing end cover B1032 is tightly fixed on the right side end face of the bearing seat D1018 by the 6-8 cover plate bolts B1031.

[0136] In the embodiment, the ratchet wheel B1030 is placed between the bearing end cover B1032 and the torque sensor 1025, and is sleeved and fixed on the screen cloth winding shaft 1017 tail end by the fixing bolt B1029. The pawl B1023 matched with the ratchet wheel B1030 is sleeved on one end of the double-headed threaded pin shaft B1020, and the other end of the double-headed threaded pin shaft B1020 is fixed on the bearing seat D1018 above by a nut.

[0137] Embodiment two:

[0138] The utility model provides a kind of frame plate type multilayer composite screen net tensioning method for vibrating screen, use according to the utility model provides a kind of frame plate type multilayer composite screen net tensioning device 100 for vibrating screen, including the following steps:

[0139] Step S1: the first layer screen cloth 9, the second layer screen cloth 11, the third layer screen cloth 13 width direction starting end to be tensioned are inserted into the screen cloth winding shaft 1017 through hole groove C of first layer screen cloth winding device 10, second layer screen cloth winding device 12, third layer screen cloth winding device 14 respectively;

[0140] Step S2: start control device 15 operation, by control device 15 control start hydraulic station 16 operation;

[0141] Step S3: hydraulic station 16 provides certain pressure and flow rate's hydraulic power oil to the hydraulic motor 1001 of first layer screen cloth winding device 10, second layer screen cloth winding device 12, third layer screen cloth winding device 14 respectively, and drives hydraulic motor 1001 to rotate with screen cloth winding shaft 1017, can directly wind certain amount of first layer screen cloth 9, second layer screen cloth 11, third layer screen cloth 13 to be tensioned to the screen cloth winding shaft 1017 of first layer screen cloth winding device 10, second layer screen cloth winding device 12, third layer screen cloth winding device 14 respectively;

[0142] Step S4: the lower pressing frame assembly 405 is placed on the upper surface of the support platform assembly 102 of rack assembly 1;

[0143] Step S5: the first layer screen cloth 9, the second layer screen cloth 11, the third layer screen cloth 13 width direction front end are simultaneously pulled and introduced into the lower pressing frame assembly 405 of screen cloth fixing frame assembly 4 through screen cloth guide assembly 8, until reaching the concave-convex groove of lower short pressing strip A4051;

[0144] Step S6: the upper short pressing strip A401 is placed above lower short pressing strip A4051 of lower pressing frame assembly 405, and the front end of first layer screen cloth 9, second layer screen cloth 11, third layer screen cloth 13 is preliminarily pressed and fixed by the weight and concave-convex groove of upper short pressing strip A401;

[0145] Step S7: start hydraulic station 16 to provide hydraulic power to drive 3 groups of hydraulic cylinders 201 of front cylinder group assembly 2 to be started synchronously, extend, so as to drive 3 groups of front end U-shaped pressing plate assembly 3 to move downward through connecting rod 203, until pressing plate 301 and upper short pressing strip A401 are completely contacted, and under the action of hydraulic power and hydraulic cylinder 201, first layer screen cloth 9, second layer screen cloth 11, third layer screen cloth 13 front end are further completely pressed and fixed in the concave-convex groove of upper short pressing strip A401, lower short pressing strip A4051;

[0146] Step S8: The upper short pressing strip A401, the lower short pressing strip A4051, and the first layer of screen cloth 9, the second layer of screen cloth 11, and the third layer of screen cloth 13 are completely locked and fixed together by using 8-12 fixed bolts 403 and fixed nuts 404;

[0147] Step S9: According to the mesh size of the first layer of screen cloth 9, the second layer of screen cloth 11, and the third layer of screen cloth 13, the tensioning force and torque value required for tensioning different screen cloths are set, and the control device 15 controls the hydraulic station 16 to provide different pressure and flow hydraulic power oil to the hydraulic motor 1001 of the third layer of screen cloth winding device 14, the second layer of screen cloth winding device 12, and the first layer of screen cloth winding device 10 in turn, and the hydraulic motor 1001 drives the screen cloth winding shaft 1017 to rotate, and the third layer of screen cloth 13, the second layer of screen cloth 11, and the first layer of screen cloth 9 are tensioned in turn. The actual torque value of the screen cloth winding shaft 1017 on the third layer of screen cloth winding device 14, the second layer of screen cloth winding device 12, and the first layer of screen cloth winding device 10 can be measured in real time by the torque sensor 1025 and transmitted to the control device 15, which is compared with the set value as a feedback control signal to control the output flow and pressure of the hydraulic station 16 to control the output torque of the hydraulic motor 1001, so that the third layer of screen cloth 13, the second layer of screen cloth 11, and the first layer of screen cloth 9 reach the set tensioning force value and are tensioned, and the screen cloth remains in a tensioned state, and the hydraulic motor 1001 no longer drives the screen cloth winding shaft 1017 to rotate;

[0148] Step S10: Rotate the pawl A1005, the pawl B1023 to the ratchet A1006, the ratchet B1030 of the third layer of screen cloth winding device 14, the second layer of screen cloth winding device 12, and the first layer of screen cloth winding device 10, so as to mechanically lock the screen cloth winding shaft 1017 of the third layer of screen cloth winding device 14, the second layer of screen cloth winding device 12, and the first layer of screen cloth winding device 10 by the pawl and the ratchet respectively, and make the first layer of screen cloth 9, the second layer of screen cloth 11, and the third layer of screen cloth 13 still in the set tensioning force tensioned state;

[0149] Step S11: Place the upper short pressing strip B406 above the lower short pressing strip B4053 of the lower pressing frame assembly 405;

[0150] Step S12: Start the hydraulic station 16 to provide hydraulic power to drive the 3 groups of hydraulic cylinder assemblies 5 to start and extend synchronously, so as to drive the 3 groups of rear U-shaped pressing plate assemblies 6 to move downward through the connecting rods 203, until the pressing plate 301 completely contacts the upper short pressing strip B406, and the first layer of screen cloth 9, the second layer of screen cloth 11, and the third layer of screen cloth 13 are completely pressed and fixed in the concave-convex grooves of the upper short pressing strip B406 and the lower short pressing strip B4053 under the action of hydraulic power and the hydraulic cylinder 201;

[0151] Step S13: using 4-6 fixed bolts 403, fixed nuts 404 to completely lock and fix the upper short pressing strip B406, the lower short pressing strip B4053 and the first layer screen cloth 9, the second layer screen cloth 11, the third layer screen cloth 13 rear end together, so that the first layer screen cloth 9, the second layer screen cloth 11, the third layer screen cloth 13 can still be tensioned according to the set tension in the width direction;

[0152] Step S14: placing the upper long pressing strip A402 and the upper long pressing strip B407 on the upper surface of the lower long pressing strip A4052 and the lower long pressing strip B4054 of the lower pressing frame assembly 405 respectively at the first layer screen cloth 9, the second layer screen cloth 11, the third layer screen cloth 13 above the concave-convex groove;

[0153] Step S15: using 14-16 fixed bolts 403, fixed nuts 404 to completely lock and fix the upper long pressing strip A402 and the lower long pressing strip A4052 and the upper long pressing strip B407 and the lower long pressing strip B4054 with the first layer screen cloth 9, the second layer screen cloth 11, the third layer screen cloth 13 on both sides in the concave-convex groove, so that the first layer screen cloth 9, the second layer screen cloth 11, the third layer screen cloth 13 can still be tensioned according to the set tension in the length direction;

[0154] Step S16: the control device 15 controls the hydraulic motor 1001 of the third layer screen cloth winding device 14, the second layer screen cloth winding device 12 and the first layer screen cloth winding device 10 to return oil and release pressure through the hydraulic station 16, and the hydraulic motor 1001 stops running;

[0155] Step S17: the control device 15 starts the self-propelled motor 701 of the automatic cutting device 7 to run, the self-propelled motor 701 drives the right walking wheel 703 and the left walking wheel 706 below it to move forward in the two dovetail grooves on the upper surface of the dovetail groove track 704 along the screen cloth guide assembly 8, and the cutter 702 installed at the output end of the self-propelled motor 701 automatically cuts the first layer screen cloth 9, the second layer screen cloth 11 and the third layer screen cloth 13 which have been tensioned by tension, realizes the separation of the first layer screen cloth 9, the second layer screen cloth 11 and the third layer screen cloth 13 in the screen cloth fixing frame assembly 4 from the screen cloth on the first layer screen cloth winding device 10, the second layer screen cloth winding device 12 and the third layer screen cloth winding device 14, then the automatic cutting device 7 returns to walk to the starting position, and the self-propelled motor 701 of the automatic cutting device 7 stops running controlled by the control device 15;

[0156] Step S18: rotate the pawls A1005, B1023 on the first layer screen cloth winding device 10, the second layer screen cloth winding device 12, the third layer screen cloth winding device 14, and move away the ratchets A1006, B1030, so that the first layer screen cloth 9, the second layer screen cloth 11, and the third layer screen cloth 13 on the first layer screen cloth winding device 10, the second layer screen cloth winding device 12, and the third layer screen cloth winding device 14 return to a natural relaxed state;

[0157] Step S19: control the three groups of hydraulic cylinders 201 of the front hydraulic cylinder group assembly 2 to be synchronously started and retracted by the control device 15 through the hydraulic station 16, so that the three groups of front end U-shaped pressing plate assemblies 3 are driven to move upward by the connecting rods 203 until they return to the initial position;

[0158] Step S20: control the three groups of hydraulic cylinders 201 of the rear hydraulic cylinder group assembly 5 to be synchronously started and retracted by the control device 15 through the hydraulic station 16, so that the three groups of rear end U-shaped pressing plate assemblies 6 are driven to move upward by the connecting rods 203 until they return to the initial position;

[0159] Step S21: move the screen cloth fixing frame assembly 4 with the screen cloths being tensioned at a set tension force from the rack assembly 1, and then use high-strength adhesive and other screen mesh bonding tools to simultaneously bond and solidify the first layer screen cloth 9, the second layer screen cloth 11, and the third layer screen cloth 13, which are in a tensioned state, to the upper surface of the screen plate 17, so as to manufacture a frame plate type multi-layer composite screen mesh for a vibrating screen with a tensioned state, and then loosen the fixing bolts 403 and the fixing nuts 404, so that the first layer screen cloth 9, the second layer screen cloth 11, and the third layer screen cloth 13, as well as the upper short pressing strip A401, the upper long pressing strip A402, the upper short pressing strip B406, and the upper long pressing strip B407, are separated from the lower pressing frame assembly 405;

[0160] Step S22: repeat steps S4-S21, and a next frame plate type multi-layer composite screen mesh for a vibrating screen with a tensioned state can be manufactured.

[0161] The advantages of the utility model are:

[0162] (1) The utility model provides a frame plate type multi-layer composite screen mesh tensioning device and method for a vibrating screen, which can realize tensioning of each layer of screen cloth in the frame plate type multi-layer composite screen mesh for a vibrating screen according to a set tension force value of each layer of screen cloth according to different mesh numbers and different screen cloth wire diameters.

[0163] (2) The problems of manual screen cloth winding, inaccurate manual screen cloth tensioning force, and inability to measure and feedback control are overcome, the elasticity and toughness of each layer of screen cloth are ensured to be reasonable, and the screen cloth is neither too loose nor too tightly tensioned.

[0164] (3) because the screen inherent frequency is proportional to the square root of the tension, the resonance zone can be avoided by adjusting the tension, which is beneficial to the screen working far from the resonance state, and is beneficial to ensuring the best screening effect of the vibrating screen;

[0165] (4) improve the manufacturing quality and service life of the frame plate type multi-layer composite screen of the vibrating screen, save the use cost and the cost of the vulnerable parts of the vibrating screen;

[0166] (5) improve the continuous operation efficiency and reliability of the vibrating screen;

[0167] (6) prevent the solid phase separated in the solid-liquid separation and screening process of the vibrating screen from gathering into a group during the migration process on the screen surface, ensure the correctness of the solid phase migration track, and further improve the screening effect, screening precision and solid phase migration efficiency of the vibrating screen;

[0168] (7) the hydraulic system and automatic control are adopted, the degree of automation is high, the labor intensity is light, and the screen manufacturing efficiency is high;

[0169] (8) simple, convenient, fast, simple, convenient and fast;

[0170] (9) the system structure is compact, the energy consumption is low, the occupied area is small, and the health, safety and environmental protection requirements are met;

[0171] (10) the tensioning force can be applied to the screen cloth of each layer of the frame plate type multi-layer composite screen of the vibrating screen respectively, and the tensioning force can also be applied to the single-layer screen cloth;

[0172] (11) the device and the method are not only suitable for the frame plate type multi-layer composite screen of the vibrating screen in the petroleum field, but also suitable for the frame plate type multi-layer composite screen of the vibrating screen in other fields, and the frame plate type multi-layer composite screen of the vibrating screen manufactured by the device and the method is not only suitable for the petroleum engineering field, but also can be applied to other fields, such as solid-liquid separation, solid phase liquid separation and drying, particle screening and particle classification, and has wide application prospect and application field.

[0173] In the description of the utility model, it should be understood that the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0174] In the utility model, unless another definite provision and limitation, the term "mount", "link", "connect", "fix" and so on term should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connect;Can be mechanical connection, also can be electric connection;Can be direct connection, also can pass through intermediate medium indirectly connect, can be two element inside intercommunication.For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific circumstances.

[0175] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0176] Finally, it should be noted that the above only for the preferred embodiments of the present application, and does not constitute any limitation on the present application. Although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A frame plate type multi-layer composite screen tensioning device for a vibrating screen, characterized by, It comprises: The rack assembly (1), the front cylinder group assembly (2), the front end U-shaped compression plate assembly (3), the screen cloth fixing frame assembly (4), the rear cylinder group assembly (5), the rear end U-shaped compression plate assembly (6), the automatic cutting device (7), the screen cloth guide assembly (8), the first layer screen cloth (9), the first layer screen cloth winding device (10), the second layer screen cloth (11), the second layer screen cloth winding device (12), the third layer screen cloth (13), the third layer screen cloth winding device (14), the control device (15), the hydraulic station (16), which can be used for applying tension to each layer of screen cloth during the manufacturing process of the frame plate type multi-layer composite screen cloth for the vibrating screen, and can also be used for applying tension to single-layer screen cloth; The front cylinder group assembly (2) and the rear cylinder group assembly (5) are respectively fixedly installed above the front support assembly (101) and the rear support assembly (103) of the rack assembly (1) through the connecting bolts and the cylinder flange (202), and are connected with the front end U-shaped compression plate assembly (3) and the rear end U-shaped compression plate assembly (6) through the connecting rods (203) below the front cylinder group assembly (2) and the rear cylinder group assembly (5), and under the driving of the cylinder (201), the front end U-shaped compression plate assembly (3) and the rear end U-shaped compression plate assembly (6) are driven to move up and down, so as to compress or relax the screen cloth; The screen cloth fixing frame assembly (4) is arranged on the upper surface of the support platform assembly (102) of the rack assembly (1), and is used for fixing the first layer screen cloth (9), the second layer screen cloth (11) and the third layer screen cloth (13) in the tensioned state; The automatic cutting device (7) is located above the screen cloth guide assembly (8) and is fixedly installed on the track support (104) on the right side of the rear support assembly (103) through the inner hexagonal connecting bolt group A (705) and the inner hexagonal connecting bolt group B (707), when the first layer screen cloth (9), the second layer screen cloth (11) and the third layer screen cloth (13) are fixed in the screen cloth fixing frame assembly (4), the automatic cutting device (7) can walk axially above the screen cloth guide assembly (8) and automatically cut the screen cloth, so as to realize the separation of the screen cloth in the screen cloth fixing frame assembly (4) and the screen cloth in the first layer screen cloth winding device (10), the second layer screen cloth winding device (12) and the third layer screen cloth winding device (14); The screen cloth guide assembly (8) is located on the right side of the rear support assembly (103) of the rack assembly (1) and is fixedly installed on the guide shaft support (105) through the connecting bolts, and is used for supporting the first layer screen cloth (9), the second layer screen cloth (11) and the third layer screen cloth (13) and guiding them into the screen cloth fixing frame assembly (4), and realizing the close and gap-free adhesion between the first layer screen cloth (9), the second layer screen cloth (11) and the third layer screen cloth (13); The first layer screen cloth winding device (10) is located on the first layer screen cloth support frame (108) of the rack assembly (1) and is fixedly installed on the first layer screen cloth support frame (108) through the connecting bolts, and is used for winding the first layer screen cloth (9) of the frame plate type multi-layer composite screen cloth for the vibrating screen. The second layer screen cloth winding device (12) is located on the second layer screen cloth support plate (107) of the rack assembly (1) and is fixedly installed on the second layer screen cloth support plate (107) by connecting bolts, and is used for winding the second layer screen cloth (11) of the frame plate type multi-layer composite screen of the vibrating screen. The third layer screen cloth winding device (14) is located on the bottom plate (106) of the rack assembly (1) and is fixedly installed on the bottom plate (106) by connecting bolts, and is used for winding the third layer screen cloth (13) of the frame plate type multi-layer composite screen of the vibrating screen. The control device (15) is installed on the base assembly (109) of the rack assembly (1) and is used for controlling the starting, running and stopping of the hydraulic station (16) and the automatic cutting device (7), and controlling the real-time tension of the first layer screen cloth (9), the second layer screen cloth (11) and the third layer screen cloth (13). The hydraulic station (16) is installed on the base assembly (109) of the rack assembly (1) and is used for starting, running and stopping the liquid cylinder group assembly (2), the rear liquid cylinder group assembly (5) and the hydraulic motor (1001).

2. A frame plate type multi-layer composite screen tensioning device for a vibrating screen according to claim 1, characterized in that, It comprises: The first layer screen cloth (9), the second layer screen cloth (11), the third layer screen cloth (13), the screen plate (17) and the screen frame (18), the mesh number of the first layer screen cloth (9) is higher than that of the second layer screen cloth (11), the mesh number of the second layer screen cloth (11) is higher than that of the third layer screen cloth (13), the screen plate (17) is a rectangular thin plate with a thickness of 3-4 mm and has uniformly distributed circular or hexagonal through holes, the screen frame (18) is a square tube welded into a whole, the cross-sectional size of the square tube is between 20 mm×20 mm and 30 mm×30 mm, and the screen plate (17) and the screen frame (18) are welded into a whole, and the first layer screen cloth (9), the second layer screen cloth (11) and the third layer screen cloth (13) in a tensioned state are simultaneously bonded and solidified to the upper surface of the screen plate (17) by using a high-strength adhesive.

3. A frame plate type multi-layer composite screen tensioning device for a vibrating screen according to claim 1, characterized in that, The rack assembly (1) comprises a front support assembly (101), a support platform assembly (102), a rear support assembly (103), a rail support (104), a guide shaft support (105), a bottom plate (106), a second layer screen cloth support plate (107), a first layer screen cloth support frame (108), a base assembly (109), a front liquid cylinder group assembly (2), a front end U-shaped pressing plate assembly (3), a screen cloth fixing frame assembly (4), a rear liquid cylinder group assembly (5), a rear end U-shaped pressing plate assembly (6), an automatic cutting device (7), a screen cloth guide assembly (8), a first layer screen cloth (9), a first layer screen cloth winding device (10), a second layer screen cloth (11), a second layer screen cloth winding device (12), a third layer screen cloth (13), a third layer screen cloth winding device (14), a control device (15) and a hydraulic station (16), which are all arranged in the rack assembly (1) and are integrally installed on the base assembly (109) to form a whole.

4. A frame plate type multi-layer composite screen tensioning device for a vibrating screen according to claim 1, characterized in that, The front cylinder group assembly (2) includes three cylinder assemblies, each of which includes a cylinder (201), a cylinder connecting flange (202), and a connecting rod (203), and is driven by a hydraulic station (16) to synchronously start, extend, and retract the three cylinders (201) to drive the three front U-shaped pressing plate assemblies (3) to press the first layer of screen cloth (9), the second layer of screen cloth (11), and the third layer of screen cloth (13) into the screen cloth fixing frame assembly (4).

5. A frame plate type multi-layer composite screen tensioning device for a vibrating screen according to claim 1, characterized in that, The rear cylinder group assembly (5) is completely identical in structure to the front cylinder group assembly (2) and includes three cylinder assemblies, each of which includes a cylinder (201), a cylinder connecting flange (202), and a connecting rod (203).

6. A frame plate type multi-layer composite screen tensioning device for a vibrating screen according to any one of claims 1, 4, 5, characterized in that, The front end U-shaped pressing plate assembly (3) and the rear end U-shaped pressing plate assembly (6) are completely identical in structure, each of which includes a pressing plate (301), a locking nut A (302), a split pin A (303), a clamp A (304), a fixed bolt A, a pin shaft (306), a shaft check ring (307), a clamp B (308), a fixed bolt B, a locking nut B (310), and a split pin B (311), and the middle part of the pin shaft (306) is fixedly connected to the end of the connecting rod (203) of the cylinder assembly in a transition fit, the two ends of the pin shaft (306) are fixedly connected to the two sides of the pressing plate (301) by the clamp A (304) and the clamp B (308) through the fixed bolt A and the fixed bolt B, and the two ends of the pin shaft (306) are fixedly locked by the locking nut A (302), the split pin A (303), the locking nut B (310), and the split pin B (311).

7. A frame plate type multi-layer composite screen tensioning device for a vibrating screen according to claim 1, characterized in that, The screen cloth fixing frame assembly (4) includes an upper short pressing strip A (401), an upper long pressing strip A (402), a fixed bolt (403), a fixed nut (404), a lower pressing frame assembly (405), an upper short pressing strip B (406), an upper long pressing strip B (407), a first layer of screen cloth (9), a second layer of screen cloth (11), and a third layer of screen cloth (13), the upper short pressing strip A (401) and the upper short pressing strip B (406) are completely identical in structure and length, the upper long pressing strip A (402) and the upper long pressing strip B (407) are completely identical in structure and length, the lower surfaces of the upper short pressing strip A (401) and the upper short pressing strip B (406) are provided with concave and convex grooves, and the first layer of screen cloth (9), the second layer of screen cloth (11), and the third layer of screen cloth (13) are fixedly pressed in the lower pressing frame assembly (405) by 22-28 fixed bolts (403) and fixed nuts (404) and are always kept in a set tension state. The lower pressing frame assembly (405) includes a lower short pressing strip A (4051), a lower long pressing strip A (4052), a lower short pressing strip B (4053), and a lower long pressing strip B (4054) and is welded into a whole. The lower short pressing strip A (4051) and the lower short pressing strip B (4053) are completely same in structure and length, the upper surface is processed with concave-convex groove, the lower surface is welded with channel steel, the lower short pressing strip A (4051) is used with the upper short pressing strip A (401), and the lower short pressing strip B (4053) is used with the upper short pressing strip B (406); The lower long pressing strip A (4052) and the lower long pressing strip B (4054) are completely same in structure and length, the upper surface is processed with concave-convex groove, the lower surface is welded with channel steel, the lower long pressing strip A (4052) is used with the upper long pressing strip A (402), and the lower long pressing strip B (4054) is used with the upper long pressing strip B (407).

8. A frame plate multi-layer composite screen tensioning device for vibrating screen according to claim 1, wherein, The automatic cutting device (7) comprises a self-walking motor (701), a cutter (702), a right walking wheel (703), a dovetail groove track (704), an inner hexagonal connecting bolt group A (705), a left walking wheel (706), and an inner hexagonal connecting bolt group B (707), the dovetail groove track (704) is fixedly installed on the track support (104) on the right side of the rear support assembly (103) by the inner hexagonal connecting bolt group A (705) and the inner hexagonal connecting bolt group B (707), the upper surface of the dovetail groove track (704) is provided with two dovetail grooves, the bottom surface of the self-walking motor (701) is provided with the right walking wheel (703) and the left walking wheel (706), the self-walking motor (701) can reciprocate in the two dovetail grooves on the upper surface of the dovetail groove track (704) along the screen cloth guide assembly (8) in the axial direction, and the cutter (702) is arranged on the output end of the self-walking motor (701).

9. A frame plate type multi-layer composite screen tensioning device for a vibrating screen according to claim 1, characterized in that, The screen cloth guide assembly (8) comprises an oil cup A (801), a bearing cover A (802), a bolt A (803), a sealing gasket A (804), a hole check ring A (805), an axle check ring A (806), a self-aligning roller bearing A (807), a bearing seat A (808), an axle head end plate A (809), a guide shaft (810), a bearing seat B (811), a self-aligning roller bearing B (812), an axle check ring B (813), a hole check ring B (814), a sealing gasket B (815), a bolt B (816), a bearing cover B (817), an oil cup B (818), and an axle head end plate B (819). The guide shaft (810) is a hollow straight shaft and is sealed and separated by shaft head end plate A (809) and shaft head end plate B (819) at both end faces. The guide shaft (810) is respectively provided with self-aligning roller bearing A (807) and self-aligning roller bearing B (812) in the radial direction at both ends and is placed in bearing seat A (808) and bearing seat B (811). The guide shaft (810) is axially fixed by hole retainer ring A (805), hole retainer ring B (814), shaft retainer ring A (806) and shaft retainer ring B (813). Grease can be injected into bearing seat A (808) and bearing seat B (811) through oil cup A (801) and oil cup B (818) to lubricate self-aligning roller bearing A (807) and self-aligning roller bearing B (812). The guide shaft (810) is fixed by bolt A (803) and bolt B (816) to press and fix bearing cover A (802), bearing cover B (817), sealing gasket A (804) and sealing gasket B (815) to the end faces of bearing seat A (808) and bearing seat B (811).

10. A frame plate type multi-layer composite screen tensioning device for a vibrating screen according to claim 1, characterized in that, The first layer screen cloth winding device (10), the second layer screen cloth winding device (12) and the third layer screen cloth winding device (14) are completely same in structure and each include a hydraulic motor (1001), a connecting bolt A (1002), a fixed bolt A, a double-headed threaded pin shaft A (1004), a pawl A (1005), a ratchet A (1006), a bearing seat C (1007), a self-aligning roller bearing C (1008), an oil cup C (1009), a spline (1010), a motor support seat (1011), an O-shaped sealing ring A (1012), a cover plate bolt A (1013), a bearing end cover A (1014), a sealing gasket C (1015), a hole retainer ring C (1016), a screen cloth winding shaft (1017), a bearing seat D (1018), a self-aligning roller bearing D (1019), a double-headed threaded pin shaft B (1020), a hole retainer ring D (1021), a sealing gasket D (1022), a pawl B (1023), a clamping bolt (1024), a torque sensor (1025), a connecting bolt B (1026), a sensor support seat (1027), a flat key (1028), a fixed bolt B, a ratchet B (1030), a cover plate bolt B (1031), a bearing end cover B (1032), an O-shaped sealing ring B (1033), an oil cup D (1034); The screen cloth winding shaft (1017) is a hollow straight shaft and has a through hole slot C in the middle section. One end of the screen cloth winding shaft (1017) is connected with the hydraulic motor (1001) by the spline (1010) and the other end is connected with the torque sensor (1025) by the flat key (1028). The starting end of the screen cloth to be tensioned is inserted into the through hole slot C. The screen cloth winding shaft (1017) is driven to rotate by the hydraulic motor (1001) so that a certain amount of screen cloth can be directly wound on the screen cloth winding shaft (1017) and the screen cloth can be tensioned according to the set torque value and tension. The hydraulic motor (1001) is connected, fixed and supported with the motor support base (1011) through 4-6 connecting bolts A (1002); The same side direction of the motor support base (1011) is welded with a bearing seat C (1007), and a self-aligning roller bearing C (1008) installed on the screen cloth winding shaft (1017) is arranged in the bearing seat C (1007); The right side of the bearing seat C (1007) is provided with 3-4 oil cups C (1009), lubricating grease is injected into the bearing seat C (1007) through the oil cups C (1009), so as to lubricate the self-aligning roller bearing C (1008), the bearing seat C (1007) has a hole for fixing the self-aligning roller bearing C (1008) in the radial direction by a retainer C (1016), and the left side of the bearing seat C (1007) is provided with an O-shaped sealing ring A (1012) and a sealing gasket C (1015) in the bearing end cover A (1014) for end face and axial sealing, and the bearing end cover A (1014) is tightly fixed to the left side end face of the bearing seat C (1007) through 6-8 cover plate bolts A (1013); The ratchet A (1006) is arranged between the bearing end cover A (1014) and the motor support base (1011), and is sleeved and fixed on the tail end of the screen cloth winding shaft (1017) through a fixing bolt A, the pawl A (1005) used in cooperation with the ratchet A (1006) is sleeved on one end of a double-thread pin shaft A (1004), and the other end of the double-thread pin shaft A (1004) is fixed to the upper side of the bearing seat C (1007) through a nut; The torque sensor (1025) is sleeved and connected to the end of the screen cloth winding shaft (1017) through a key (1028) and is fixed by a set screw (1024), the end face of the torque sensor (1025) is fixed and installed on the sensor support base (1027) through 4-6 connecting bolts B (1026), the torque value of the screen cloth winding shaft (1017) can be measured in real time and transmitted to the control device (15), and after comparison with the set value, the torque value is used as a feedback control signal to control the output flow and pressure of the hydraulic station (16) to control the output torque of the hydraulic motor (1001), so as to control the tension of the screen cloth to be tensioned; The same side direction of the sensor support base (1027) is welded with a bearing seat D (1018), and a self-aligning roller bearing D (1019) installed on the screen cloth winding shaft (1017) is arranged in the bearing seat D (1018); The bearing seat D (1018) left side is installed with 3-4 oil cup D (1034), through oil cup D (1034) to the bearing seat D (1018) inside injects the lubricating grease, in order to carry out the lubrication to the self-aligning roller bearing D (1019), the bearing seat D (1018) inside has the hole and uses the baffle D (1021) to carry out the radial fixation to the self-aligning roller bearing D (1019), the bearing seat D (1018) right side bearing end cover B (1032) inside O type sealing ring B (1033), sealing pad D (1022) carries out the end face and axial seal, and through the number 6-8 cover plate bolt B (1031) bearing end cover B (1032) will be compressed tightly fixed in the bearing seat D (1018) right side end face; The ratchet wheel B (1030) is placed between the bearing end cover B (1032) and the torque sensor (1025), and is fixed on the screen cloth winding shaft (1017) tail end by the fixing bolt B, and the ratchet wheel B (1030) is cooperated with the pawl B (1023) which is sleeved on the double-headed threaded pin shaft B (1020) one end, and the double-headed threaded pin shaft B (1020) nut is connected and fixed on the bearing seat D (1018) above.

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