Vibrating screen with forced synchronous exciter

Abstract

The present application belongs to the field of screening equipment, especially a vibrating screen with forced synchronous exciter, comprising a screen box, a first exciter and a second exciter, the first exciter comprising a first motor and a first rotating shaft, the second exciter comprising a second motor and a second rotating shaft: a mounting seat is fixedly arranged on the outer side wall of the screen box, the mounting seat is provided with coaxial third, fourth and fifth rotating shafts, the third rotating shaft is connected with the fourth rotating shaft through a first torque sensor, and the fourth rotating shaft is connected with the fifth rotating shaft through a second torque sensor; the first rotating shaft is connected with the third rotating shaft through a first rigid transmission mechanism, and the second rotating shaft is connected with the fifth rotating shaft through a second rigid transmission mechanism. When the first exciter and the second exciter appear out-of-step phenomenon, the torque of the third rotating shaft and the torque of the fifth rotating shaft will immediately change, so that the present application can detect the out-of-step phenomenon in time, so that the equipment can be repaired in time, and the damage of the equipment can be avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of screening equipment, in particular to a vibrating screen with forced synchronous exciters. BACKGROUND

[0002] The forced synchronous vibrating screen comprises a plurality of exciters, and the plurality of exciters are connected through gears, chains or universal shafts or the like in rigidity, so that the plurality of exciters vibrate synchronously, and the stability of the track of the screen box is improved. The existing exciter comprises a motor, a rotating shaft and eccentric blocks, and the eccentric blocks are usually two and are installed at two ends of the rotating shaft. When the rotating shaft drives the eccentric blocks to rotate, the eccentric blocks generate periodic centrifugal force, which is transmitted to the screen box through the rotating shaft, drives the screen box to vibrate periodically, and realizes the screening of the materials.

[0003] After the forced synchronous vibrating screen is used for a period of time, the plurality of exciters may be out of step (synchronous failure) under the influence of motor power difference, transmission component wear or electrical failure. After the plurality of exciters are out of step, the excitation direction deviates, which causes mechanical damage of the equipment, such as that the bearings of the rotating shaft bear asymmetric alternating loads, which causes the bearings to abnormally heat up, and pitting or peeling occurs in a short period of time. Meanwhile, the screen box may be cracked. The existing forced synchronous vibrating screen also affects the screening efficiency and increases the energy consumption. SUMMARY

[0004] The technical problem to be solved by the application is to provide a vibrating screen with forced synchronous exciters, which can timely find the out-of-step and prevent mechanical damage of the equipment.

[0005] To solve the above problems, the technical scheme adopted by the application is as follows: the vibrating screen with forced synchronous exciters comprises a screen box, a first exciter and a second exciter, the first exciter comprises a first motor and a first rotating shaft, the second exciter comprises a second motor and a second rotating shaft, and the first rotating shaft is connected with the second rotating shaft through a first rigid transmission mechanism.

[0006] A mounting seat is fixedly arranged on the outer side wall of the screen box, coaxial third, fourth and fifth rotating shafts are arranged on the mounting seat, the third rotating shaft is connected with the fourth rotating shaft through a first torque sensor, and the fourth rotating shaft is connected with the fifth rotating shaft through a second torque sensor.

[0007] The first rotating shaft is connected with the third rotating shaft through the first rigid transmission mechanism, and the second rotating shaft is connected with the fifth rotating shaft through the second rigid transmission mechanism.

[0008] Further, the first rigid transmission mechanism and the second rigid transmission mechanism are gears.

[0009] Further, the first torque sensor and the second torque sensor are connected with a controller, and the first motor and the second motor are connected with the controller.

[0010] Furthermore, the mounting seat is provided with a guide rail with a dovetail-shaped cross-section, the length direction of the guide rail is parallel to the length direction of the third rotating shaft, the fourth rotating shaft and the fifth rotating shaft, the guide rail is provided with a slide that slides with the guide rail, the third rotating shaft, the fourth rotating shaft and the fifth rotating shaft are installed on the slide, and the slide is connected to a gear separation drive mechanism that drives the slide to slide along the guide rail.

[0011] Furthermore, a vertical friction plate is provided on the slide, and friction wheels are provided at the ends of the first rotating shaft and the second rotating shaft. When the separation drive mechanism pushes the slide to move, the friction plate can fit the friction wheel.

[0012] Furthermore, the gear separation drive mechanism includes a first spring in a stretched state, and the two ends of the first spring are respectively connected to the slide and the screen box; the mounting seats at both ends of the slide are respectively provided with fixed blocks and slide grooves vertically passing through the mounting seats, and a lifting block is provided in the slide groove, and the lower end of the lifting block is connected to a linear motor.

[0013] Furthermore, at least three eccentric blocks are provided on each of the first rotating shaft and the second rotating shaft.

[0014] Furthermore, the first rotating shaft and the second rotating shaft each include a first mounting shaft, a vibrating shaft and a second mounting shaft, the first mounting shaft and the second mounting shaft are installed on the screen box, and the two ends of the vibrating shaft are detachably connected to the first mounting shaft and the second mounting shaft respectively; the eccentric block is installed on the vibrating shaft.

[0015] Furthermore, the eccentric block includes two end eccentric blocks and an intermediate eccentric block located between the two end eccentric blocks. The outer walls of the two ends of the vibration shaft are provided with splines, and the inner holes of the end eccentric blocks are provided with spline grooves, and the spline grooves are slidingly matched with the splines; flanges are provided on the first mounting shaft and the second mounting shaft, and the end eccentric blocks are connected to the flanges by multiple bolts, and thermal expansion gaps are provided between the two end surfaces of the vibration shaft and the first mounting shaft and the second mounting shaft respectively; the intermediate eccentric block is fixedly installed on the vibration shaft.

[0016] Furthermore, the flange is provided with a plurality of grooves on the side facing the end eccentric block, and the side of the eccentric block is provided with a plurality of protrusions, each protrusion extends into a groove, and a pressure sensor is connected to the groove through a second spring, and the protrusion is tightly attached to the pressure sensor.

[0017] The beneficial effects of the present invention are as follows: in the present invention, the first rotating shaft, the first rigid transmission mechanism, the third rotating shaft, the fourth rotating shaft, the fifth rotating shaft, the second rigid transmission mechanism, and the second rotating shaft are connected in sequence, and the first rigid transmission mechanism, the third rotating shaft, the fourth rotating shaft, the fifth rotating shaft, and the second rigid transmission mechanism play a role of forced synchronization, thereby achieving synchronous operation of the first rotating shaft and the second rotating shaft. When the degree of synchronization between the first rotating shaft and the second rotating shaft is high, the torque transmitted to the third rotating shaft by the first rigid transmission mechanism and the torque transmitted to the fifth rotating shaft by the second rigid transmission mechanism should be the same or close. Therefore, the first torque sensor and the second torque sensor are used to detect the torque experienced by the third rotating shaft and the fifth rotating shaft in real time. When there is a large difference between the torque of the third rotating shaft and the torque of the fifth rotating shaft, it can be determined that the first rotating shaft and the second rotating shaft have lost step.

[0018] When the first and second exciters lose step, the torque of the third and fifth shafts will change immediately. Therefore, the loss of step can be detected in time, so that the equipment can be repaired in time to avoid further damage to the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic top view of the present invention;

[0020] Figure 2 yes Figure 1 Middle AA cross-sectional view;

[0021] Figure 3 yes Figure 1 Schematic diagram of the BB cutaway;

[0022] Figure 4 is a schematic diagram of the first rotating shaft;

[0023] Figure 5 yes Figure 4 Middle DD cross-sectional view;

[0024] Figure 6 yes Figure 4 EE cross-sectional view diagram;

[0025] Figure markings: 1—screen box; 2—first motor; 3—first rotating shaft; 31—first mounting shaft; 32—vibration shaft; 33—second mounting shaft; 34—flange; 35—bump; 36—pressure sensor; 37—second spring; 4—second motor; 5—controller; 6—second rotating shaft; 7—mounting seat; 8—third rotating shaft; 9—fourth rotating shaft; 10—fifth rotating shaft; 11—first torque sensor; 12—second torque sensor; 13—first rigid transmission mechanism; 14—second rigid transmission mechanism; 15—guide rail; 16—slide; 17—first spring; 18—friction plate; 19—friction wheel; 20—fixed block; 21—lifting block; 22—linear motor; 23—eccentric block. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and examples.

[0027] The vibrating screen with forced synchronous exciter of the present invention is as follows Figures 1 to 6 As shown, it includes a screen box 1, a first vibrator and a second vibrator. The first vibrator and the second vibrator have the same structure. The first vibrator includes a first motor 2 and a first rotating shaft 3, and the second vibrator includes a second motor 4 and a second rotating shaft 6. The screen box 1 is installed on the support through an elastic member. A sieve plate is provided in the screen box 1. The sieve plate structure and the installation method of the screen box 1 can adopt existing technologies. The first motor 2 is connected to the first rotating shaft 3 to drive the first rotating shaft 3 to rotate. The second motor 4 is connected to the second rotating shaft 6 to drive the second rotating shaft 6 to rotate. Both ends of the first rotating shaft 3 and the second rotating shaft 6 are installed on the screen box 1 through bearings, and eccentric blocks 23 are provided on the first rotating shaft 3 and the second rotating shaft 6. When the first rotating shaft 3 and the second rotating shaft 6 rotate, the eccentric blocks 23 generate centrifugal force, thereby driving the screen box 1 to move as a whole.

[0028] A mounting base 7 is fixedly mounted on the outer wall of the screen box 1 and is fixedly connected to the screen box 1. A coaxial third, fourth, and fifth rotating shafts 8, 9, and 10 are mounted on the mounting base 7. A mounting bracket is mounted on the mounting base 7. The third, fourth, and fifth rotating shafts 8, 9, and 10 are all mounted to the mounting bracket via bearings. The third rotating shaft 8 is connected to the fourth rotating shaft 9 via a first torque sensor 11, and the fourth rotating shaft 9 is connected to the fifth rotating shaft 10 via a second torque sensor 12. The first torque sensor 11 can detect the torque applied to the third rotating shaft 8 in real time, while the second torque sensor 12 can detect the torque applied to the fifth rotating shaft 10.

[0029] The first rotating shaft 3 is connected to the third rotating shaft 8 via a first rigid transmission mechanism 13, and the second rotating shaft 6 is connected to the fifth rotating shaft 10 via a second rigid transmission mechanism 14. The transmission ratio of the first rigid transmission mechanism 13 to the second rigid transmission mechanism 14 is 1:1.

[0030] The first rigid transmission mechanism 13, the third rotating shaft 8, the fourth rotating shaft 9, the fifth rotating shaft 10 and the second rigid transmission mechanism 14 constitute a rigid transmission mechanism, which connects the first rotating shaft 3 and the second rotating shaft 6, and can promote the synchronous rotation of the first rotating shaft 3 and the second rotating shaft 6, thereby realizing forced synchronization of the first vibrator and the second vibrator, and ensuring the stability of the motion trajectory of the screen box 1.

[0031] The first rotating shaft 3 is connected to the third rotating shaft 8 through the first rigid transmission mechanism 13, and the second rotating shaft 6 is connected to the fifth rotating shaft 10 through the second rigid transmission mechanism 14. When the phase difference Δθ between the first exciter and the second exciter is not 0, there is a certain lag between one of the exciters and the other exciter. Assuming that the first exciter has a lag, at this time, the third rotating shaft 8 is subjected to the reverse resistance torque from the lagging exciter, so that the torque is reduced, and the fifth rotating shaft 10 needs to compensate for the synchronization deviation, so that the torque increases. When the phase difference Δθ between the first exciter and the second exciter increases, the lag of the first exciter increases. At this time, the torque of the third rotating shaft 8 is further reduced, and the torque of the fifth rotating shaft 10 is further increased. After the ADAMS simulation software test, assuming that there is a lag in the first exciter, under different phase differences Δθ, the torque change rate of the third rotating shaft 8 and the torque change rate of the fifth rotating shaft 10 are shown in the following table:

[0032] Phase difference Δθ Torque change rate of the third rotating shaft 8 Torque change rate of the fifth rotating shaft 10

[0033] 1° -1.7% +1.8%

[0034] 2° -3.5% +3.6%

[0035] 3° -5.2% +5.4%

[0036] 4° -6.9% +7.2.4%

[0037] 5° -8% +8%

[0038] The present invention utilizes the first torque sensor 11 and the second torque sensor 12 to respectively detect the torque of the third rotating shaft 8 and the fifth rotating shaft 10 in real time, and calculates the rate of change of the two torques. When the rate of change of the torques significantly increases to exceed the normal range, it can be determined that the first exciter and the second exciter are out of step.

[0039] Since the loss of step between the first and second exciters will immediately cause changes in the torque of the third shaft 8 and the torque of the fifth shaft 10, the loss of step can be detected in time, so that the equipment can be repaired in time to avoid further damage to the equipment.

[0040] In the present invention, the first rigid transmission mechanism 13 and the second rigid transmission mechanism 14 are gears. Specifically, the same gears are set on the first rotating shaft 3, the second rotating shaft 6, the third rotating shaft 8 and the fifth rotating shaft 10. The gear on the first rotating shaft 3 is engaged with the gear on the third rotating shaft 8, and the gear on the second rotating shaft 6 is engaged with the gear on the fifth rotating shaft 10.

[0041] The detection data of the first torque sensor 11 and the second torque sensor 12 can be transmitted to a monitoring terminal, through which management personnel can obtain data. When a loss of step occurs, the first motor 2 and the second motor 4 can be manually shut down and repaired. However, manual operation has a certain lag and cannot shut down the first motor 2 and the second motor 4 in a timely manner. To achieve automated shutdown, the first torque sensor 11 and the second torque sensor 12 are connected to the controller 5, and the first motor 2 and the second motor 4 are also connected to the controller 5. The first torque sensor 11 and the second torque sensor 12 transmit the detected data to the controller 5. The controller 5 calculates the torque change rate of the third shaft 8 and the torque change rate of the fifth shaft 10 based on the detection data and compares the calculated results with the normal range. When the torque change rate of the third shaft 8 and the torque change rate of the fifth shaft 10 exceed the normal range, the first motor 2 and the second motor 4 are controlled to shut down.

[0042] When a step-out occurs, the stress on the gears, third shaft 8, fourth shaft 9, and fifth shaft 10 increases. To prevent damage to these components, the present invention provides a guide rail 15 with a dovetail-shaped cross section on the mounting base 7. Two guide rails 15 may be provided, and the two guide rails 15 are parallel to each other. The length of the guide rail 15 is parallel to the length of the third shaft 8, fourth shaft 9, and fifth shaft 10. A slide 16 is provided on the guide rail 15, which slidably engages with the guide rail 15. The third shaft 8, fourth shaft 9, and fifth shaft 10 are mounted on the slide 16. The slide 16 is connected to a gear separation drive mechanism that drives the slide 16 to slide along the guide rail 15.

[0043] When a step-out occurs, the gear separation drive mechanism drives the slide 16 to slide along the guide rail 15, and the slide 16 drives the third rotating shaft 8, the fourth rotating shaft 9, and the fifth rotating shaft 10 to move axially as a whole, thereby driving the gear on the third rotating shaft 8 to disengage the gear on the first rotating shaft 3, and at the same time, the gear on the fifth rotating shaft 10 to disengage the gear on the second rotating shaft 6, thereby preventing the gears, the third rotating shaft 8, the fourth rotating shaft 9, and the fifth rotating shaft 10 from being continuously subjected to complex high stress. The gear separation drive mechanism can be connected to the controller 5. When the controller 5 determines that the first vibrator and the second vibrator have lost step, it controls the operation of the gear separation drive mechanism while disconnecting the power supply of the first motor 2 and the second motor 4.

[0044] After the first motor 2 and the second motor 4 are powered off, the eccentric masses 23 on the first rotating shaft 3 and the second rotating shaft 6 will continue to rotate for a period of time due to inertia, making it impossible to achieve a quick shutdown. Since a step-out has occurred, the force on the screen box 1 changes, which can easily cause damage to the screen box 1. In order to shorten the downtime, the present invention is provided with a vertical friction plate 18 on the slide 16, and friction wheels 19 are provided at the ends of the first rotating shaft 3 and the second rotating shaft 6. When the separation drive mechanism pushes the slide 16 to move, the friction plate 18 can fit the friction wheel 19. When the vibrating screen is operating normally, there is a gap between the friction plate 18 and the friction wheel 19. At this time, the gear on the third rotating shaft 8 is engaged with the gear on the first rotating shaft 3, and the gear on the fifth rotating shaft 10 is engaged with the gear on the second rotating shaft 6. When the gear separation drive mechanism drives the gear to separate, the friction plate 18 is pressed against the friction wheel 19. The sides of the friction wheel 19 and the friction wheel 19 that contact each other are made of wear-resistant and high-friction materials, so that there is a large friction resistance between the friction plate 18 and the friction wheel 19. Under the action of this friction resistance, the first rotating shaft 3 and the second rotating shaft 6 can be quickly braked, shortening the downtime and reducing the risk of damage to the screen box 1. The friction wheel 19 and the first motor 2 are respectively located at both ends of the first rotating shaft 3.

[0045] The gear separation drive mechanism can be a device such as a hydraulic cylinder, but the hydraulic cylinder requires a matching hydraulic system, which increases the complexity of the structure. In addition, the gear separation drive mechanism must vibrate with the screen box 1, which places high requirements on the anti-seismic performance of the hydraulic equipment. As a preferred embodiment of the present invention: the gear separation drive mechanism includes a first spring 17 in a stretched state, and the two ends of the first spring 17 are respectively connected to the slide 16 and the screen box 1; the mounting seats 7 at both ends of the slide 16 are respectively provided with fixed blocks 20 and a slide groove vertically passing through the mounting seat 7, the fixed block 20 is fixed on the mounting seat 7, and a lifting block 21 is provided in the slide groove, and the lower end of the lifting block 21 is connected to a linear motor 22. During assembly, first install one end of the first spring 17 on the slide 16 and the other end on the screen box 1. Then, pull the slide 16 away from the screen box 1, gradually stretching the first spring 17 and generating tension. When one end of the slide 16 reaches the fixed stop 20, the linear motor 22 pushes the lifting stop 21 upward. At this point, the two ends of the slide 16 respectively contact the lifting stop 21 and the fixed stop 20, maintaining a stable position. The friction plate 18 is then installed. Because the first spring 17 has significant resistance when stretched, a jack can be installed between the slide 16 and the screen box 1 to propel the slide 16. If a step is lost, the linear motor 22 drives the lifting stop 21 downward into the chute, disengaging it from the slide 16. Under the tension of the first spring 17, the slide 16 moves, achieving gear separation, and the friction plate 18 simultaneously presses against the friction wheel 19. The pressure between the friction plate 18 and the friction wheel 19 can be adjusted by adjusting the elastic modulus and the stretch length of the first spring 17.

[0046] In a traditional dual-shaft forced synchronous vibrating screen, two eccentric masses 23 are provided on each rotating shaft. During operation, the first and second rotating shafts 3 and 6 are subjected to a large concentrated stress at the location where the eccentric masses 23 are connected. The periodic centrifugal force F = m*r*ω2 generated by the rotation of the eccentric masses 23, where m is the mass of the eccentric mass 23, r is the eccentricity, and ω is the angular velocity of the eccentric mass 23, can be seen. The greater the mass of the eccentric mass 23, the higher the concentrated stress locally borne by the first and second rotating shafts 3 and 6, and the more likely the first and second rotating shafts 3 and 6 are to break. Therefore, the stress at the connection between the first and second rotating shafts 3 and 6 and each eccentric mass 23 can be reduced by reducing the mass of the eccentric mass 23 and increasing the number of eccentric masses 23, thereby making the stress more dispersed and extending the service life of the first and second rotating shafts 3 and 6. Therefore, in the present invention, at least three eccentric masses 23 are provided on each of the first and second rotating shafts 3 and 6, and the number can be 3, 4, 5, 6, etc.

[0047] When screening different materials, it may be necessary to replace the eccentric block 23 with a different mass and a different eccentric distance, or when the connection between the eccentric block 23 and the rotating shaft is damaged, a new eccentric block 23 needs to be replaced. In the existing vibrating screen, the first rotating shaft 3 and the second rotating shaft 6 are a whole. When replacing, the entire first rotating shaft 3 and the second rotating shaft 6 need to be removed and then installed as a whole, which is inconvenient to operate and inefficient. In the present invention, the first rotating shaft 3 and the second rotating shaft 6 both include a first mounting shaft 31, a vibration shaft 32 and a second mounting shaft 33. The first mounting shaft 31 and the second mounting shaft 33 are installed on the screen box 1 through bearings, and the two ends of the vibration shaft 32 are detachably connected to the first mounting shaft 31 and the second mounting shaft 33 respectively; the eccentric block 23 is installed on the vibration shaft 32. When it is necessary to replace the eccentric block 23 with a different mass and a different eccentric distance, the vibration shaft 32 can be removed and then a new vibration shaft 32 can be installed without removing the entire first rotating shaft 3 and the second rotating shaft 6, which is more convenient to operate.

[0048] The two ends of the vibration shaft 32 can be connected to the first mounting shaft 31 and the second mounting shaft 33 via flanges, which does not affect the strength of the first mounting shaft 31, the second mounting shaft 33, and the vibration shaft 32, and ensures stable transmission. However, if flanges are fixed at both ends of the vibration shaft 32, the weight of the vibration shaft 32 will increase, increasing energy consumption. In addition, the flanges at both ends of the vibration shaft 32 will not fit neatly with the flanges on the first mounting shaft 31 and the second mounting shaft 33, resulting in uncontrollable clearance and difficulty in ensuring assembly accuracy.

[0049] In the present invention, the eccentric block 23 includes two end eccentric blocks and an intermediate eccentric block located between the two end eccentric blocks. The outer walls of the two ends of the vibration shaft 32 are provided with splines, and the inner holes of the end eccentric blocks are provided with spline grooves, and the spline grooves are slidably matched with the splines; flanges 34 are provided on the first mounting shaft 31 and the second mounting shaft 33, and the end eccentric blocks are connected to the flanges 34 by multiple bolts, and thermal expansion gaps are provided between the two end surfaces of the vibration shaft 32 and the first mounting shaft 31 and the second mounting shaft 33 respectively; the intermediate eccentric block is fixedly installed on the vibration shaft 32.

[0050] Since the end eccentric block is slidably fitted with the spline on the outer wall of the vibration shaft 32 through the spline groove, the end eccentric block can be slid to adjust the axial position of the end eccentric block. During installation, the vibration shaft 32 is moved between the first mounting shaft 31 and the second mounting shaft 33, and then the end eccentric block is slid so that the end eccentric blocks at both ends of the vibration shaft 32 are respectively fitted with the flanges on the first mounting shaft 31 and the second mounting shaft 33, and then the end eccentric block is connected to the flange as a whole with bolts.

[0051] It can be seen that the present invention uses the end eccentric block as a connecting piece, eliminating the need for an additional flange, reducing the weight of the vibration shaft 32. At the same time, it ensures that the end eccentric block fits the flange 34, eliminating the fitting gap. In addition, when the end eccentric block rotates, there is a periodically changing stress at the connection between the end eccentric block and the vibration shaft 32, which causes the temperature of the vibration shaft 32 to rise and produce axial expansion. Therefore, appropriate thermal expansion gaps are reserved at both ends of the vibration shaft 32, and the thermal expansion gaps can be filled after the vibration shaft 32 expands axially. The thermal expansion gap can be matched with the axial thermal expansion of the vibration shaft 32 based on the temperature of the vibration shaft 32 during operation and the axial thermal expansion at that temperature.

[0052] During screening, the entire first and second rotating shafts 3 and 6 vibrate, potentially loosening the bolts connecting the end eccentric blocks to the flange 34. This loosening can affect the stability of the vibrating screen. To monitor the bolts for looseness in real time, the flange 34 is provided with multiple grooves on the side facing the end eccentric blocks. The eccentric blocks 23 are also provided with multiple protrusions 35 on their sides. Each protrusion 35 extends into a groove, and a pressure sensor 36 is connected to each groove via a second spring 37. The protrusions 35 abut against the pressure sensors 36. The number of grooves, protrusions 35, and pressure sensors 36 can be three, four, or evenly distributed around the center of the flange 34. During assembly, the protrusions 35 enter the grooves, exerting a force on the pressure sensors 36. This compresses the second spring 37, and the pressure on each pressure sensor 36 is equal. When the bolts loosen, the connection between the end eccentric blocks and the flange 34 becomes less stable, making it difficult for them to fit tightly together. This creates a gap, which can easily cause the axial position of the end eccentric blocks to change, driving the protrusions 35 to move axially, causing the pressure in the pressure sensors 36 to change. Therefore, it is possible to determine whether the bolts are loose based on the detection structure of each pressure sensor 36, and when the bolts are loose, the machine can be stopped for inspection and maintenance in time.

[0053] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A vibrating screen with a forced synchronous exciter, comprising a screen box (1), a first exciter, and a second exciter, wherein the first exciter comprises a first motor (2) and a first rotating shaft (3), and the second exciter comprises a second motor (4) and a second rotating shaft (6), characterized in that: A mounting seat (7) is fixedly provided on the outer side wall of the screen box (1); a coaxial third rotating shaft (8), a fourth rotating shaft (9) and a fifth rotating shaft (10) are provided on the mounting seat (7); the third rotating shaft (8) is connected to the fourth rotating shaft (9) via a first torque sensor (11); and the fourth rotating shaft (9) is connected to the fifth rotating shaft (10) via a second torque sensor (12); The first rotating shaft (3) is connected to the third rotating shaft (8) via a first rigid transmission mechanism (13), and the second rotating shaft (6) is connected to the fifth rotating shaft (10) via a second rigid transmission mechanism (14); The first rigid transmission mechanism (13) and the second rigid transmission mechanism (14) are gears; A guide rail (15) having a dovetail-shaped cross section is provided on the mounting seat (7), the length direction of the guide rail (15) is parallel to the length direction of the third rotating shaft (8), the fourth rotating shaft (9) and the fifth rotating shaft (10), a slide seat (16) is provided on the guide rail (15) and is slidably matched with the guide rail (15), the third rotating shaft (8), the fourth rotating shaft (9) and the fifth rotating shaft (10) are mounted on the slide seat (16), and the slide seat (16) is connected to a gear separation drive mechanism that drives the slide seat (16) to slide along the guide rail (15); The gear separation drive mechanism comprises a first spring (17) in a stretched state, wherein the two ends of the first spring (17) are respectively connected to the slide (16) and the screen box (1); the mounting seats (7) at both ends of the slide (16) are respectively provided with fixed blocks (20) and a slide groove vertically penetrating the mounting seat (7); a lifting block (21) is provided in the slide groove, and the lower end of the lifting block (21) is connected to a linear motor (22).

2. The vibrating screen with a forced synchronous exciter according to claim 1, characterized in that: The first torque sensor (11) and the second torque sensor (12) are connected to a controller (5), and the first motor (2) and the second motor (4) are both connected to the controller (5).

3. The vibrating screen with a forced synchronous exciter according to claim 1, characterized in that: A vertical friction plate (18) is provided on the slide (16), and friction wheels (19) are provided at the ends of the first rotating shaft (3) and the second rotating shaft (6). When the separation drive mechanism pushes the slide (16) to move, the friction plate (18) can fit the friction wheel (19).

4. The vibrating screen with a forced synchronous exciter according to claim 1, characterized in that: At least three eccentric blocks (23) are provided on each of the first rotating shaft (3) and the second rotating shaft (6).

5. The vibrating screen with a forced synchronous exciter according to claim 4, characterized in that: The first rotating shaft (3) and the second rotating shaft (6) both comprise a first mounting shaft (31), a vibrating shaft (32) and a second mounting shaft (33); the first mounting shaft (31) and the second mounting shaft (33) are mounted on the screen box (1); both ends of the vibrating shaft (32) are detachably connected to the first mounting shaft (31) and the second mounting shaft (33); and the eccentric block (23) is mounted on the vibrating shaft (32).

6. The vibrating screen with a forced synchronous exciter according to claim 5, characterized in that: The eccentric block (23) includes two end eccentric blocks and a middle eccentric block located between the two end eccentric blocks. The outer walls of the two ends of the vibration shaft (32) are provided with splines, and the inner holes of the end eccentric blocks are provided with spline grooves, and the spline grooves are slidably matched with the splines. Flanges (34) are provided on the first mounting shaft (31) and the second mounting shaft (33). The end eccentric blocks are connected to the flanges (34) by multiple bolts, and thermal expansion gaps are provided between the two end surfaces of the vibration shaft (32) and the first mounting shaft (31) and the second mounting shaft (33). The middle eccentric block is fixedly mounted on the vibration shaft (32).

7. The vibrating screen with a forced synchronous exciter according to claim 6, characterized in that: The flange (34) is provided with a plurality of grooves on the side facing the end eccentric block, and the side of the eccentric block (23) is provided with a plurality of protrusions (35), each protrusion (35) extends into a groove, and a pressure sensor (36) is connected to the groove via a second spring (37), and the protrusion (35) is in close contact with the pressure sensor (36).

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