A far-resonance relaxation sieve

Abstract

This application relates to the field of screening machinery, and in particular to a far-resonance relaxation screen. The active screen frame and the floating screen frame of the far-resonance relaxation screen are connected by shear springs; multiple relaxation screen plates are sequentially installed on adjacent crossbeams of the active and floating screen frames; a vibrator is installed in a circular hole above the active screen frame, and a drive system is installed on motor support legs, connecting the drive system and the vibrator. The active screen frame is mounted on the front and rear support legs via vibration isolation springs; the vibrator includes a vibrator body, through-hole conductive slip rings, and torque-changing eccentric wheels. Two through-hole conductive slip rings and two sets of torque-changing eccentric wheels are installed at both ends of the drive shaft of the vibrator body, and the two sets of torque-changing eccentric wheels are in phase. The through-hole conductive slip rings are located between the vibrator body and the torque-changing eccentric wheels, and the torque-changing eccentric wheels are used for online adjustment of the vibrator's eccentric mass torque. The far-resonance relaxation screen provided by this application can solve the problem that existing vibrating relaxation screens cannot operate in a more stable second-order far-resonance region.

Description

Technical Field

[0001] This invention belongs to the field of screening machinery, specifically providing a far-resonance relaxation screen. Background Technology

[0002] Vibrating tension screens solve the problems of screen hole clogging, adhesion, and screen panel buildup during the screening of sticky and wet fine particles. They effectively reduce the particle size of sticky and wet fine particles in dry screening from 13mm to 3mm, and are widely used in the dry deep screening of moist fine particles. Amplitude stability is one of the main factors affecting the screening performance of vibrating screens. The optimal operating frequency range for existing vibrating tension screens lies between the system's constant amplitude frequency and anti-resonance frequency, between the first-order and second-order resonance regions. In this frequency range, the relative amplitude is relatively less affected by material loading and external factors (such as ambient temperature and throughput), resulting in relatively high stability and reliability. However, for dual-mass vibrating equipment, the most stable frequency range is actually located in the system's second-order far-resonance region, not between the constant amplitude frequency and anti-resonance frequency. If the vibrating tension screen can operate in the system's second-order far-resonance region, the problem of unstable amplitude in dual-mass vibrating tension screening equipment will be completely solved, effectively improving its throughput and screening efficiency.

[0003] The inability of existing vibrating tension screens to operate in the second-order far-resonance region of the system is determined by both their structure and excitation method. Existing vibrating tension screens are driven by inertial exciters, whose eccentric mass moment remains constant during operation. When the exciter starts, the excitation frequency gradually increases from zero to the operating frequency, and the excitation force also increases accordingly. As the excitation frequency increases, the relative amplitude of the main floating screen frame gradually increases from zero, reaching its maximum value when the excitation frequency equals the second-order resonant frequency. Because the tensioning screen plates are fixed at both ends to adjacent crossbeams of the main floating screen frame by wedges, the relative amplitude increases accordingly with the increase in excitation frequency, leading to a gradual increase in the tension of the screen plates. When the tensile stress on the screen plate exceeds the tensile strength of its material, the screen plate will break. Therefore, the vibrating tension screen cannot normally cross the second-order resonant region of the system and can only operate before the system's second-order resonant frequency. See the last paragraph of section 3.4.2 in the reference (Research on dynamics and screening characteristics of nonlinear vibrating tension screen. Lin Dongdong. China University of Mining and Technology (Beijing), 2024.).

[0004] Therefore, how to provide a vibration relaxation screen that can operate in the second-order far resonance region of a system with more stable amplitude is a technical problem that needs to be solved in this field. Summary of the Invention

[0005] The purpose of this application is to provide a far-resonance relaxation screen to overcome the problem that existing vibrating relaxation screens cannot cross the second-order resonance region, so that the vibrating relaxation screen can work in the second-order far-resonance region of the system with more stable amplitude.

[0006] This application provides a far-resonance relaxation screen to solve the problem of unstable relative amplitude of existing vibrating relaxation screens affected by material loading and external factors (such as ambient temperature, throughput, etc.). It includes an active screen frame, a floating screen frame, a shear spring, a relaxation screen plate, a vibrator, a drive system, vibration isolation springs, a front support leg, a motor support leg, and a rear support leg.

[0007] The active screen frame and the floating screen frame are connected by the shear spring, and the crossbeam of the floating screen frame passes through the square hole below the active screen frame;

[0008] Multiple tension screen plates are sequentially installed on the crossbeams adjacent to the active screen frame and the floating screen frame;

[0009] The vibrator is installed in the circular hole above the active screen frame, the drive system is installed on the motor support leg, the drive system is connected to the vibrator, and the active screen frame is installed on the front support leg and the rear support leg through the vibration isolation spring;

[0010] The exciter includes an exciter body, a through-hole conductive slip ring, and a torque-changing eccentric wheel. Two through-hole conductive slip rings and two sets of torque-changing eccentric wheels are installed at both ends of the drive shaft of the exciter body, and the two sets of torque-changing eccentric wheels are in phase. The through-hole conductive slip ring is located between the exciter body and the torque-changing eccentric wheel. The torque-changing eccentric wheel is used to adjust the eccentric mass torque of the exciter online.

[0011] In the above technical solution, the variable torque eccentric wheel further includes a shaft end mounting plate and a linear slide module. The shaft end mounting plate has a keyway hole at its center for connecting with the drive shaft of the vibrator body via a key, thereby achieving circumferential fixation between the shaft end mounting plate and the drive shaft of the vibrator body, and axial fixation between the shaft end mounting plate and the drive shaft of the vibrator body. Two linear slide modules are symmetrically mounted on the front and back of the shaft end mounting plate, respectively. The counterweight slider position of each linear slide module is adjustable to change the eccentric mass moment of the vibrator.

[0012] In the above technical solution, further, when the torque-changing eccentric wheel is installed on the shaft end of the drive shaft of the vibrator body, the shaft end of the drive shaft refers to the end that is not connected to the drive system; the shaft end mounting plate is sleeved on the drive shaft of the vibrator body through a keyway hole, the shoulder of the drive shaft abuts against the shaft end mounting plate, and the shaft end retaining ring is installed in the retaining ring mounting groove of the keyway hole of the shaft end mounting plate. After the bolt passes through the bolt hole of the shaft end retaining ring, it is screwed into the threaded hole opened at the end of the drive shaft to fix the shaft end mounting plate between the shaft end retaining ring and the shoulder of the drive shaft, thereby realizing the axial fixation between the shaft end mounting plate and the drive shaft of the vibrator body.

[0013] In the above technical solution, further, when the torque-changing eccentric wheel is installed on the drive end of the transmission shaft of the vibrator body, the drive end of the transmission shaft refers to the end connected to the drive system; the shaft end mounting plate is sleeved on the transmission shaft of the vibrator body through a keyway hole, the shoulder of the transmission shaft abuts against the shaft end mounting plate, and the output end of the flexible coupling of the drive system is sleeved on the transmission shaft of the vibrator body and keyedly connected to the transmission shaft, so as to fix the shaft end mounting plate between the output end of the flexible coupling and the shoulder of the transmission shaft, thereby achieving axial fixation between the shaft end mounting plate and the transmission shaft of the vibrator body.

[0014] The linear slide module includes bearing housings, tapered roller bearings, linear guides, trapezoidal lead screws, rigid couplings, servo motors, servo motor mounting bases, slider nuts, and counterweight sliders. Two bearing housings are symmetrically mounted on both sides of the linear guides. Two tapered roller bearings are respectively mounted inside the two bearing housings. The two ends of the trapezoidal lead screw are respectively mounted on the inner rings of the tapered roller bearings. The slider nut is sleeved on the trapezoidal lead screw, with its lower surface contacting the upper surface of the linear guides. The counterweight slider is mounted on the upper surface of the slider nut. The material of the counterweight slider can be selected from materials of different densities, such as lead, cast iron, and aluminum alloy, depending on the required eccentricity. The rigid coupling connects the trapezoidal lead screw to the output shaft of the servo motor. The servo motor mounting base is used to mount the servo motor. Each linear slide module is symmetrically mounted on the shaft end mounting plate through the bolt holes of the linear guides and the servo motor mounting base, with the servo motor of each linear slide module positioned close to the rotation axis of the shaft end mounting plate.

[0015] The drive system includes a motor, a motor mount, a transmission device, a flexible coupling, a large pulley, a belt, and a small pulley. The motor mount is mounted on the motor support leg, the motor is mounted on the motor mount, the transmission device is mounted inside the motor mount, the small pulley is mounted on the motor output shaft, the large pulley is mounted on one end of the transmission device's drive shaft, and the large pulley and the small pulley are located on the same side. The flexible coupling is mounted on the other end of the transmission device's drive shaft, and the belt is mounted on the large pulley and the small pulley. The output end of the flexible coupling is used for transmission connection with the drive shaft of the vibrator body. A set of torque-changing eccentric pulleys is mounted on the drive shaft of the vibrator body, located between the output end of the flexible coupling and the drive shaft of the vibrator body.

[0016] Furthermore, this application also provides a method for controlling the above-mentioned far-resonance relaxation sieve, the method comprising:

[0017] Step 1: First, control the servo motor of the torque-changing eccentric wheel to rotate through an external signal, and adjust the eccentric mass torque of the exciter to zero;

[0018] Step 2: Turn on the drive system to drive the vibrator to rotate. Since the eccentric mass moment of the vibrator is zero, the vibrator has no excitation force, and the screening machine will not vibrate.

[0019] Step 3: When the excitation frequency reaches the set operating frequency located in the second-order far resonance region of the system, the eccentric mass moment of the vibrator is gradually increased from zero to the required eccentric mass moment. The excitation force of the vibrator also gradually increases accordingly, the screen machine starts to vibrate, and the main floating screen frame generates relative motion.

[0020] Compared with the prior art, the beneficial effects of this application are as follows:

[0021] The remote resonance relaxation screen provided in this application has an active screen frame and a floating screen frame connected by a shear spring, with multiple relaxation screen plates sequentially installed on adjacent crossbeams of the main floating screen frame. The vibrator consists of a vibrator body, a through-hole conductive slip ring, and a torque-changing eccentric wheel, enabling real-time online stepless adjustment of the eccentric mass torque.

[0022] Accordingly, by utilizing a variable-torque eccentric wheel, the exciter's eccentric mass moment remains zero until the excitation frequency reaches the operating frequency. Once the excitation frequency increases to the operating frequency, the eccentric mass moment is gradually increased from zero to the required value, enabling the vibrating tension screen to operate in the second-order far-resonance region. Specifically, during operation, the servo motor of the variable-torque eccentric wheel is first controlled by an external signal to rotate, thus zeroing the exciter's eccentric mass moment. Then, the drive system is activated to rotate the exciter. Since the exciter's eccentric mass moment is zero, there is no excitation force, and the screen does not vibrate. When the excitation frequency reaches the set operating frequency located in the system's second-order far-resonance region, the exciter's eccentric mass moment is gradually increased from zero to the required value. The excitation force of the exciter also gradually increases accordingly, causing the screen to vibrate and the main floating screen frame to move relative to the exciter.

[0023] In other words, this far-resonance relaxation screen does not vibrate before the working frequency, but only vibrates at the working frequency. Therefore, it can cross the resonance zone with zero amplitude and work directly in the second-order far-resonance zone of the system, thus completely solving the problem of unstable amplitude of the vibrating relaxation screen. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the far-resonance relaxation sieve provided in this application.

[0026] Figure 2 This is a schematic diagram of the active screen frame of the far-resonance relaxation screen provided in this application.

[0027] Figure 3 This is a schematic diagram of the floating screen frame of the far-resonance relaxation screen provided in this application.

[0028] Figure 4 This is a schematic diagram of the exciter structure of the far-resonance relaxation screen provided in this application.

[0029] Figure 5 This is a schematic diagram of a torque-changing eccentric wheel that can be installed on the shaft end, as provided in this application.

[0030] Figure 6 This is a schematic diagram of the torque-changing eccentric wheel installed on the drive end, as provided in this application.

[0031] Figure 7This is a structural schematic diagram of the linear slide module with a variable torque eccentric wheel provided in this application.

[0032] Figure 8 This is a schematic diagram of the drive system for the far-resonance relaxation screen provided in this application.

[0033] Figure 9 This is a schematic diagram of a torque converter eccentric wheel mounted on the shaft end.

[0034] Figure 10 This is a schematic diagram of a torque converter eccentric wheel mounted on the drive end.

[0035] The reference numerals in the figure are as follows: 101-Active screen frame; 102-Floating screen frame; 103-Shear spring; 104-Relaxed screen plate; 105-Vibrator; 106-Drive system; 107-Vibration isolation spring; 108-Front support leg; 109-Motor support leg; 110-Rear support leg; 111-Vibrator body; 112-Through-hole conductive slip ring; 113-Torque-changing eccentric wheel; 114-Shaft end mounting plate; 115-Linear slide module; 116-Bearing seat; 117- Tapered roller bearing; 118-Linear guide; 119-Trapezoidal lead screw; 120-Rigid coupling; 121-Servo motor; 122-Servo motor mounting base; 123-Slider nut; 124-Counterweight slider; 125-Motor; 126-Motor base; 127-Transmission device; 128-Flexible coupling; 129-Large pulley; 130-Belt; 131-Small pulley; 132-Keyway hole; 133-Retaining ring mounting groove; 134-Shaft end retaining ring. Detailed Implementation

[0036] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] See Figures 1 to 10 As shown, the remote resonance tension screen provided in this application includes an active screen frame 101, a floating screen frame 102, a shear spring 103, a tension screen plate 104, a vibrator 105, a drive system 106, a vibration isolation spring 107, a front support leg 108, a motor support leg 109, and a rear support leg 110.

[0040] Among them, the crossbeam of the floating screen frame 102 passes through the square hole below the active screen frame 101, and the active screen frame 101 (such as...) Figure 2 ) and floating screen frame 102 (e.g. Figure 3 The active screen frame 101 and the floating screen frame 102 are connected by shear springs 103; multiple tension screen plates 104 are sequentially installed on the adjacent crossbeams of the active screen frame 101 and the floating screen frame 102; the vibrator 105 is installed in the round hole above the active screen frame 101; the drive system 106 is installed on the motor support leg 109; the drive system 106 is connected to the vibrator 105; and the active screen frame 101 is installed on the front support leg 108 and the rear support leg 110 by vibration isolation springs 107.

[0041] like Figure 4As shown, the vibrator 105 includes a vibrator body 111, a through-hole conductive slip ring 112, and a torque-changing eccentric wheel 113. The two through-hole conductive slip rings 112 and the two sets of torque-changing eccentric wheels 113 are installed at both ends of the drive shaft of the vibrator body 111 (distinguishing between the shaft end and the drive end; the shaft end refers to the end not connected to the drive system 106, while the drive end refers to the end connected to the drive system 106). The two sets of torque-changing eccentric wheels 113 are in phase (the phase consistency here means that when the two sets of torque-changing eccentric wheels 113 are centered on the rotation axis of the drive shaft, the angle presented by the shaft end mounting plate 114 on the torque-changing eccentric wheel 113 through this center is consistent). The through-hole conductive slip ring 112 is located between the vibrator body 111 and the torque-changing eccentric wheel 113. The torque-changing eccentric wheel 113 is used to adjust the eccentric mass torque of the vibrator 105 online. The rotor of the through-hole conductive slip ring 112 is sleeved on the drive shaft of the vibrator 105 and fixed to the drive shaft by bolts around the rotor. The stator of the through-hole conductive slip ring 112 is fixed to the housing of the vibrator 105 by anti-rotation plates. The through-hole conductive slip ring 112 is used to supply power and transmit signals to the servo motor 121 of the torque converter eccentric wheel 113, to prevent the power lines and encoder lines of the servo motor 121 from getting tangled and broken due to continuous rotation when the torque converter eccentric wheel 113 rotates.

[0042] like Figure 5-6 As shown, the torque-changing eccentric wheel 113 includes a shaft end mounting plate 114 and a linear slide module 115. The shaft end mounting plate 114 has a keyway hole 132 at its center, which is used to connect with the drive shaft of the vibrator body 111 via a key, thereby achieving circumferential fixation between the shaft end mounting plate 114 and the drive shaft of the vibrator body 111, and axial fixation between the shaft end mounting plate 114 and the drive shaft of the vibrator body 111. Two linear slide modules 115 are symmetrically mounted on the front and back of the shaft end mounting plate 114. The position of the counterweight slider 124 of each linear slide module 115 is adjustable to change the eccentric mass moment of the vibrator 105.

[0043] like Figure 7As shown, each linear slide module 115 includes a bearing housing 116, a tapered roller bearing 117, a linear guide rail 118, a trapezoidal lead screw 119, a rigid coupling 120, a servo motor 121, a servo motor mounting base 122, a slide nut 123, and a counterweight slide 124. Two bearing housings 116 are symmetrically mounted on both sides of the linear guide rail 118. Two tapered roller bearings 117 are respectively mounted inside the two bearing housings 116. The two ends of the trapezoidal lead screw 119 are mounted on the inner rings of the corresponding two tapered roller bearings 117 mounted inside the two bearing housings 116. The slider nut 123 is sleeved on the trapezoidal lead screw 119. The lower surface of the slider nut 123 contacts the upper surface of the linear guide rail 118. The counterweight slider 124 is mounted on the upper surface of the slider nut 123. There is only one servo motor 121 and one servo motor mounting base 122. The servo motor mounting base 122 is used to mount the servo motor 121. Each linear slide module 115 is mounted on the shaft end mounting plate 114 through the bolt holes of the linear guide rail 118 and the servo motor mounting base 122. The mounting position of the servo motor 121 is close to the rotation axis of the shaft end mounting plate 114. After the linear guide 118 and the servo motor mounting base 122 are fixed, the servo motor 121 can be rotated in both directions by controlling the external signal, which in turn drives the trapezoidal lead screw 119 to rotate in both directions. This, in turn, pushes the slider nut 123 and the counterweight slider 124 fixed on the slider nut 123 to reciprocate linearly along the linear guide 118, thereby adjusting the distance between the counterweight slider 124 and the axis of rotation online, thus changing the eccentric mass moment of the vibrator 105.

[0044] Four identical linear slide modules 115 are symmetrically mounted on both sides of the shaft end mounting plate 114 via bolt holes in the linear guide rail 118 and the servo motor mounting base 122. The servo motors 121 of the linear slide modules 115 are close to the rotation axis of the shaft end mounting plate 114. This mounting method can reduce the centrifugal force generated when the servo motor 121 rotates around the rotation axis of the shaft end mounting plate 114, thereby improving the service life of the servo motor 121.

[0045] When adjusting the eccentric mass moment, the servo motors 121 of the two linear slide modules 115 located on the same side of the rotation axis of the shaft end mounting plate 114 rotate synchronously, in the same direction, and at the same speed. By controlling the forward and reverse rotation of the servo motors 121 of the linear slide modules 115 on the same side of the rotation axis of the shaft end mounting plate 114 via external signals, the distance of the slider nuts 123 of the linear slide modules 115 on both sides of the rotation axis of the shaft end mounting plate 114 from the rotation axis of the shaft end mounting plate 114 can be adjusted, thus changing the eccentric mass moment. The greater the difference in distance between the slider nuts 123 of the linear slide modules 115 on both sides of the rotation axis of the shaft end mounting plate 114 and the center of the shaft end mounting plate 114, the greater the eccentric mass moment of the torque-changing eccentric wheel 113. The eccentric mass moment of the torque-changing eccentric wheel 113 is maximized when the slider nuts 123 of the linear slide modules 115 on both sides of the rotation axis of the shaft end mounting plate 114 are located at the closest and farthest ends of the rotation axis of the shaft end mounting plate 114, respectively. When the distance between the slider nuts 123 of the linear slide modules 115 on both sides of the rotation axis of the shaft end mounting plate 114 and the rotation axis of the shaft end mounting plate 114 is the same, the centrifugal forces of the counterweight sliders 124 of the linear slide modules 115 on both sides cancel each other out, and the eccentric mass moment of the torque-changing eccentric wheel 113 is zero.

[0046] like Figure 8 As shown, the drive system 106 includes a motor 125, a motor mount 126, a transmission device 127, a flexible coupling 128, a large pulley 129, a belt 130, and a small pulley 131. Specifically, the motor mount 126 is mounted on the motor support leg 109, the motor 125 is mounted on the motor mount 126, the transmission device 127 is mounted inside the motor mount 126, the small pulley 131 is mounted on the output shaft of the motor 125, the large pulley 129 is mounted on one end of the transmission shaft of the transmission device 127, and the large pulley 129 and the small pulley 131 are located on the same side, the flexible coupling 128 is mounted on the other end of the transmission shaft of the transmission device 127, and the belt 130 is mounted on the large pulley 129 and the small pulley 131. The output end of the flexible coupling 128 is used for transmission connection with the drive shaft of the vibrator body 111. A set of torque-changing eccentric wheels 113 is mounted on the drive shaft of the vibrator body 111, located between the output end of the flexible coupling 128 and the drive shaft of the vibrator body 111 (this set of torque-changing eccentric wheels 113 is mounted on the drive end of the drive shaft of the vibrator body 111), while another set of torque-changing eccentric wheels 113 is mounted on the shaft end of the drive shaft of the vibrator body 111. Here, the shaft end of the drive shaft refers to the end not connected to the drive system 106, while the drive end of the drive shaft refers to the end connected to the drive system 106.

[0047] When the torque-changing eccentric wheel 113 is installed on the shaft end of the drive shaft of the vibrator body 111, it is necessary to use Figure 5 This type of torque-changing eccentric wheel 113 (its keyway hole 132 has a retaining ring mounting groove 133). For example... Figure 9As shown, the shaft end mounting plate 114 is sleeved on the drive shaft of the vibrator body 111 through the keyway hole 132. The shoulder of the drive shaft abuts against the shaft end mounting plate 114. The shaft end retaining ring 134 is installed in the retaining ring mounting groove 133 of the keyway hole 132 of the shaft end mounting plate 114. After the bolt passes through the bolt hole of the shaft end retaining ring 134, it is screwed into the threaded hole opened at the end of the drive shaft to fix the shaft end mounting plate 114 between the shaft end retaining ring 134 and the shoulder of the drive shaft, thereby achieving axial fixation between the shaft end mounting plate 114 and the drive shaft of the vibrator body 111.

[0048] When the torque-changing eccentric wheel 113 is installed at the drive end of the transmission shaft of the vibrator body 111, it can be used Figure 5 (Its keyway hole 132 is provided with a retaining ring mounting groove 133) or Figure 6 This type of torque-changing eccentric wheel 113 (its keyway hole 132 does not have a retaining ring mounting groove 133). For example... Figure 10 As shown, the shaft end mounting plate 114 is sleeved on the drive shaft of the vibrator body 111 through the keyway hole 132. The shoulder of the drive shaft abuts against the shaft end mounting plate 114. The output end of the flexible coupling 128 of the drive system 106 is sleeved on the drive shaft of the vibrator body 111 and is keyed to the drive shaft to fix the shaft end mounting plate 114 between the output end of the flexible coupling 128 and the shoulder of the drive shaft, thereby achieving axial fixation between the shaft end mounting plate 114 and the drive shaft of the vibrator body 111. Here, the flexible coupling 128 is also fixed to the end of the drive shaft by the shaft end retaining ring 134 and bolts. Specifically, after the bolt passes through the bolt hole of the shaft end retaining ring 134, it is screwed into the threaded hole opened at the end of the drive shaft to fix the shaft end mounting plate 114 between the output end of the flexible coupling 128 and the shoulder of the drive shaft, thereby achieving axial fixation between the shaft end mounting plate 114 and the drive shaft of the vibrator body 111.

[0049] When this remote resonance relaxation screen is in operation, it is controlled using the remote resonance relaxation screen control method to make the remote resonance relaxation screen work in the second-order remote resonance region.

[0050] Step 1: First, control the servo motor 121 of the torque-changing eccentric wheel 113 to rotate through an external signal, and adjust the eccentric mass torque of the exciter 105 to zero.

[0051] Step 2: Turn on the drive system 106 to drive the vibrator 105 to rotate. Since the eccentric mass moment of the vibrator 105 is zero, the vibrator 105 has no excitation force, and the screening machine will not vibrate.

[0052] Step 3: When the excitation frequency reaches the set operating frequency located in the second-order far resonance region of the system, the eccentric mass moment of the vibrator 105 is gradually increased from zero to the required eccentric mass moment. The excitation force of the vibrator 105 also gradually increases accordingly, the screen starts to vibrate, and the main floating screen frame generates relative motion.

[0053] Therefore, the far-resonance relaxation screen provided in this embodiment utilizes the variable torque eccentric wheel 113 to ensure that the exciter 105 has zero eccentric mass moment before the excitation frequency reaches the working frequency, and then gradually increases the eccentric mass moment from zero to the required eccentric mass moment when the excitation frequency increases to the working frequency, thus providing the ability of the vibration relaxation screen to work in the second-order far-resonance region.

[0054] When this far-resonance relaxation screen is in operation, the servo motor 121 of the torque-changing eccentric wheel 113 is first rotated by an external signal to zero the eccentric mass torque of the vibrator 105. Then, the drive system 106 is turned on to drive the vibrator 105 to rotate. Since the eccentric mass torque of the vibrator 105 is zero, the vibrator 105 has no excitation force, and the screen will not vibrate. When the excitation frequency reaches the set working frequency located in the second-order far-resonance region of the system, the eccentric mass torque of the vibrator 105 is gradually increased from zero to the required eccentric mass torque. The excitation force of the vibrator 105 also gradually increases accordingly, and the screen begins to vibrate, with the main floating screen frame generating relative motion. In other words, this far-resonance relaxation screen does not vibrate before the working frequency, but only vibrates at the working frequency. Therefore, it can cross the resonance region with zero amplitude and directly operate in the second-order far-resonance region of the system, completely solving the problem of unstable amplitude of the vibrating relaxation screen.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application. In addition, those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are meant to be within the scope of this application and form different embodiments.

Claims

1. A far-resonance relaxation sieve, characterized in that, It includes an active screen frame, a floating screen frame, shear springs, a tension screen plate, a vibrator, a drive system, vibration isolation springs, front support legs, motor support legs, and rear support legs; The active screen frame and the floating screen frame are connected by the shear spring, and the crossbeam of the floating screen frame passes through the square hole below the active screen frame; Multiple tension screen plates are sequentially installed on the crossbeams adjacent to the active screen frame and the floating screen frame; The vibrator is installed in the circular hole above the active screen frame, the drive system is installed on the motor support leg, the drive system is connected to the vibrator, and the active screen frame is installed on the front support leg and the rear support leg through the vibration isolation spring; The exciter includes an exciter body, a through-hole conductive slip ring, and a torque-changing eccentric wheel. Two through-hole conductive slip rings and two sets of torque-changing eccentric wheels are installed at both ends of the drive shaft of the exciter body, and the two sets of torque-changing eccentric wheels are in phase. The through-hole conductive slip ring is located between the exciter body and the torque-changing eccentric wheel. The torque-changing eccentric wheel is used to adjust the eccentric mass torque of the exciter online.

2. The far-resonance relaxation screen according to claim 1, characterized in that: The variable torque eccentric wheel includes a shaft end mounting plate and a linear slide module; The shaft end mounting plate has a keyway hole at its center, which is used to connect with the drive shaft of the vibrator body by a key, so as to achieve circumferential fixation between the shaft end mounting plate and the drive shaft of the vibrator body, and to maintain axial fixation between the shaft end mounting plate and the drive shaft of the vibrator body. Two linear slide modules are symmetrically mounted on the front of the shaft end mounting plate, and two linear slide modules are symmetrically mounted on the back of the shaft end mounting plate. The position of the counterweight slider of each linear slide module is adjustable to change the eccentric mass moment of the exciter.

3. The variable torque eccentric wheel according to claim 2, characterized in that: When the torque-changing eccentric wheel is mounted on the shaft end of the drive shaft of the vibrator body, the shaft end of the drive shaft represents the end that is not connected to the drive system. The shaft end mounting plate is sleeved on the drive shaft of the vibrator body through a keyway hole. The shoulder of the drive shaft abuts against the shaft end mounting plate. The shaft end retaining ring is installed in the retaining ring mounting groove of the keyway hole of the shaft end mounting plate. After the bolt passes through the bolt hole of the shaft end retaining ring, it is screwed into the threaded hole opened at the end of the drive shaft to fix the shaft end mounting plate between the shaft end retaining ring and the shoulder of the drive shaft, thereby achieving axial fixation between the shaft end mounting plate and the drive shaft of the vibrator body.

4. The variable torque eccentric wheel according to claim 2, characterized in that: When the torque-changing eccentric wheel is installed on the drive end of the transmission shaft of the vibrator body, the drive end of the transmission shaft refers to the end connected to the drive system. The shaft end mounting plate is sleeved on the drive shaft of the vibrator body through a keyway hole. The shoulder of the drive shaft abuts against the shaft end mounting plate. The output end of the flexible coupling of the drive system is sleeved on the drive shaft of the vibrator body and is keyed to the drive shaft, so as to fix the shaft end mounting plate between the output end of the flexible coupling and the shoulder of the drive shaft, thereby achieving axial fixation between the shaft end mounting plate and the drive shaft of the vibrator body.

5. The far-resonance relaxation screen according to claim 2, characterized in that: The linear slide module includes a bearing housing, tapered roller bearings, linear guide rails, trapezoidal lead screws, rigid couplings, servo motors, servo motor mounting bases, slide nuts, and counterweight slides. Two bearing housings are symmetrically mounted on both sides of the linear guide rail. Two tapered roller bearings are respectively mounted inside the two bearing housings. The two ends of the trapezoidal lead screw are respectively mounted on the inner rings of the tapered roller bearings. The slider nut is sleeved on the trapezoidal lead screw. The lower surface of the slider nut contacts the upper surface of the linear guide rail. The counterweight slider is mounted on the upper surface of the slider nut. The rigid coupling connects the trapezoidal lead screw and the output shaft of the servo motor. The servo motor mounting bracket is used to mount the servo motor. Each of the linear slide modules is mounted on the shaft end mounting plate via bolt holes in the linear guide rail and the servo motor mounting base, with the servo motor located close to the rotation axis of the shaft end mounting plate.

6. The far-resonance relaxation screen according to claim 1, characterized in that: The drive system includes a motor, a motor mount, a transmission device, a flexible coupling, a large pulley, a belt, and a small pulley; The motor mount is installed on the motor support leg, the motor is installed on the motor mount, the transmission device is installed inside the motor mount, the small pulley is installed on the motor output shaft, the large pulley is installed on one end of the transmission device drive shaft, and the large pulley and the small pulley are located on the same side. The flexible coupling is installed on the other end of the transmission device drive shaft, and the belt is installed on the large pulley and the small pulley. The output end of the flexible coupling is used for transmission connection with the drive shaft of the vibrator body. A set of torque-changing eccentric pulleys is installed on the drive shaft of the vibrator body, located between the output end of the flexible coupling and the drive shaft of the vibrator body.

7. A control method for a far-resonance relaxation screen as described in any one of claims 1-6, characterized in that, The method includes: Step 1: First, control the servo motor of the torque-changing eccentric wheel to rotate through an external signal, and adjust the eccentric mass torque of the exciter to zero; Step 2: Turn on the drive system to drive the vibrator to rotate. Since the eccentric mass moment of the vibrator is zero, the vibrator has no excitation force, and the screening machine will not vibrate. Step 3: When the excitation frequency reaches the set operating frequency located in the second-order far resonance region of the system, the eccentric mass moment of the vibrator is gradually increased from zero to the required eccentric mass moment. The excitation force of the vibrator also gradually increases accordingly, the screen machine starts to vibrate, and the main floating screen frame generates relative motion.

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