Belt pulley structure for vibration frequency test

Abstract

The utility model discloses a belt pulley structure for testing vibration frequency, which comprises a fixed belt pulley and a detachable movable belt pulley, a belt is arranged between the fixed belt pulley and the movable belt pulley, the movable belt pulley is sleeved on a reducing rotating shaft, and the reducing rotating shaft is rotatably arranged on external vibration equipment. The fixed belt wheel is connected to a driving shaft of the vibration equipment in a sleeving mode, a cylindrical sliding groove is formed in the center of the interior of the variable-diameter rotating shaft, a sliding column is arranged in the sliding groove in a sliding mode, and a rotating disc is fixedly arranged on the side surface of the end, away from the external vibration equipment, of the variable-diameter rotating shaft. The outer diameter of the variable-diameter rotating shaft can be adjusted, so that movable belt wheels with different diameters are installed, the transmission ratio of the belt wheel set can be changed by adjusting the variable-diameter rotating shaft and installing the corresponding movable belt wheels and belts, then the vibration frequency of external vibration equipment is changed, and flexible adjustment can be achieved according to specific requirements of the vibration screen. The inherent frequencies of different vibrating screens are tested, and the universality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vibrating screens, in particular to a pulley structure for vibration frequency testing. Background Art

[0002] Vibrating screen is a screening equipment widely used in mining, building materials, chemical industry and other industries. Its vibration frequency is one of the key factors affecting the screening effect. The diameter of the pulley in the existing vibration equipment for vibration frequency testing is usually fixed, and its natural frequency is also fixed. Therefore, when testing the vibration frequency, only a single natural frequency can be tested. It is not easy to flexibly adjust according to the specific requirements of the vibrating screen, and its universality is low. To this end, we propose a pulley structure for vibration frequency testing. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a pulley structure for vibration frequency testing. By adjusting the variable diameter rotating shaft and installing the corresponding movable pulley and belt, the transmission ratio of the pulley group can be changed, thereby changing the vibration frequency of the external vibration equipment. It can be flexibly adjusted according to the specific requirements of the vibration screen to test the natural frequencies of different vibration screens, thereby improving universality and effectively solving the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pulley structure for vibration frequency testing, comprising a fixed pulley and a detachable movable pulley, a belt is arranged between the fixed pulley and the movable pulley, the movable pulley is sleeved on a variable diameter rotating shaft, the variable diameter rotating shaft is rotatably arranged on an external vibration device, and the fixed pulley is sleeved on the driving shaft of the vibration device.

[0005] As an optimal technical solution of the utility model, a cylindrical slide groove is opened at the inner center of the variable diameter rotating shaft, a sliding column is slidably arranged in the slide groove, a turntable is fixedly arranged on the side surface of the end of the variable diameter rotating shaft away from the external vibration device, a screw is installed at the center of the turntable, the screw passes through the slide groove and is threadedly connected with the screw hole opened at the center of the circle of the side surface of the sliding column; inclined grooves are evenly opened on the circumferential side surface of the sliding column, a lifting column is slidably arranged in the inclined groove, the top end of the lifting column passes through the through groove opened on the side surface of the variable diameter rotating shaft and is connected to the arc support plate, and the movable pulley is sleeved on the outer side of the arc support plate.

[0006] As a preferred technical solution of the utility model, a crank is fixedly provided on the side surface of the turntable.

[0007] As a preferred technical solution of the utility model, the crank comprises a fixed rod and a rotating sleeve, the fixed rod is fixedly arranged on the side surface of the turntable, and the rotating sleeve is rotatably arranged outside the fixed rod.

[0008] As a preferred technical solution of the utility model, two limiting grooves are symmetrically provided on both sides of the inner bottom of the inclined groove, and limiting blocks corresponding to the limiting grooves are symmetrically provided on both side surfaces of the bottom end of the lifting column.

[0009] As a preferred technical solution of the utility model, the side surfaces of the turntable and the variable diameter shaft are evenly provided with a plurality of positioning holes, the positioning holes are distributed in a circular array with the center of the side surfaces of the turntable and the variable diameter shaft as the center, and positioning rods are arranged in the positioning holes.

[0010] As a preferred technical solution of the utility model, the positioning rod is L-shaped and is provided in plurality, the ends of the plurality of positioning rods are fixedly connected to the fixing block, and the positioning rods are radially distributed around the fixing block.

[0011] As a preferred technical solution of the utility model, the fixed block is circular and concentrically arranged with the turntable, a through hole is opened at the center of the fixed block, a stud is fixedly arranged on the side surface of the turntable, the stud passes through the through hole on the fixed block, and a nut is threadedly connected to the outer side of the stud.

[0012] As a preferred technical solution of the utility model, grooves are evenly formed on the peripheral surface of the fixing block, and anti-slip patterns are arranged on the inner surface of the grooves.

[0013] Compared with the prior art, the beneficial effects of the utility model are: the outer diameter of the variable diameter rotating shaft can be adjusted to install movable pulleys of different diameters. By adjusting the variable diameter rotating shaft and installing the corresponding movable pulleys and belts, the transmission ratio of the pulley group can be changed, thereby changing the vibration frequency of the external vibration equipment. It can be flexibly adjusted according to the specific requirements of the vibrating screen, and the natural frequencies of different vibrating screens can be tested, thereby improving universality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 It is a side view structural schematic diagram of the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the variable diameter rotating shaft of the utility model;

[0017] Figure 4 For this utility model Figure 3 Schematic diagram of the local structure;

[0018] Figure 5 For this utility model Figure 4 Schematic diagram of the local cross-section structure.

[0019] In the figure: 1 fixed pulley, 2 movable pulley, 3 belt, 4 variable diameter shaft, 5 arc support plate, 6 lifting column, 7 turntable, 8 crank, 9 screw, 10 sliding column, 11 inclined groove, 12 limit groove, 13 limit block, 14 positioning rod, 15 fixed block, 16 stud, 17 nut, 18 positioning hole. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-5 The utility model provides a technical solution: a pulley structure for vibration frequency testing, comprising a fixed pulley 1 and a detachable movable pulley 2, a belt 3 is arranged between the fixed pulley 1 and the movable pulley 2, the movable pulley 2 is sleeved on a variable diameter rotating shaft 4, the variable diameter rotating shaft 4 can adjust its outer diameter, so as to install movable pulleys 2 of different diameters; the variable diameter rotating shaft 4 is connected to a driving structure of an external vibration device such as a motor, the fixed pulley 1 is sleeved on the driving shaft of the vibration device, the motor of the vibration device drives the movable pulley 2 to rotate through the variable diameter rotating shaft 4, the movable pulley 2 drives the fixed pulley 1 to rotate through the belt 3, and the pulley 1 drives the eccentric wheel of the vibration device to rotate through the driving shaft, thereby starting the vibration screen to work, and during the test, the vibration frequency is tested by a vibration sensor and a signal generator, and displayed on an oscilloscope for the tester to view.

[0022] The connection between the vibrating screen and the eccentric wheel and other components in the test equipment such as vibration sensors, signal generators and oscilloscopes are all well-known technologies. Their specific structures, connection methods and working principles are all existing technologies and are not part of the improvement of this application, so they will not be described in detail here.

[0023] By adjusting the variable diameter shaft 4 and installing the corresponding movable pulley 2 and belt 3, the transmission ratio of the pulley group can be changed, thereby changing the vibration frequency of the external vibration equipment. It can be flexibly adjusted according to the specific requirements of the vibration screen, and the natural frequencies of different vibration screens can be tested and debugged, which greatly improves the universality.

[0024] One of the specific technical solutions is that a cylindrical slide groove is opened at the inner center of the variable diameter rotating shaft 4, and a sliding column 10 is slidably arranged in the slide groove. A turntable 7 is fixedly arranged on the side surface of the end of the variable diameter rotating shaft 4 away from the external vibration device, and a screw 9 is installed at the center of the turntable 7. The screw 9 penetrates into the slide groove and is threadedly connected with the screw hole opened at the center of the circle of the side surface of the sliding column 10. Rotating the turntable 7 can drive the screw 9 to rotate, so that the sliding column 10 moves back and forth in the slide groove inside the variable diameter rotating shaft 4; the peripheral side surface of the sliding column 10 is evenly opened with inclined grooves 11, preferably three groups, and a lifting column 6 is slidably arranged in the inclined groove 11, and the top end of the lifting column 6 passes through the opening on the side surface of the variable diameter rotating shaft 4 The through groove is connected to the arc-shaped support plate 5. The cross-sectional size of the through groove is slightly larger than that of the lifting column 6, so that the lifting column 6 can only be lifted up and down in the through groove but cannot move forward, backward, left or right. When the sliding column 10 moves forward and backward in the slide groove, its inclined groove 11 also moves with it, thereby pushing the lifting column 6 to move upward or downward, driving the arc-shaped support plate 5 to rise and fall, and the movable pulley 2 is sleeved on the outer side of the arc-shaped support plate 5. The overall outer diameter of the variable diameter shaft 4 is adjusted by adjusting the position of each arc-shaped support plate 5, thereby fixing the movable pulleys 2 of different specifications and inner diameters, and realizing flexible adjustment of the transmission ratio of the pulley group, thereby driving the vibration screen to vibrate through different vibration frequencies, which is suitable for vibration screen tests with different requirements.

[0025] According to a preferred technical solution, a crank 8 is fixedly provided on the side surface of the turntable 7. Specifically, the crank 8 includes a fixed rod and a rotating sleeve. The fixed rod is fixedly provided on the side surface of the turntable 7, and the rotating sleeve is rotatably provided on the outside of the fixed rod. When adjusting the variable diameter shaft 4, the turntable 7 can be driven to rotate by grasping the rotating sleeve of the crank 8 and then rotating the crank 8, thereby driving the sliding column 10 to slide and the lifting column 6 and the arc-shaped support plate 5 to rise and fall through the screw rod 9.

[0026] According to a preferred technical solution, two limiting grooves 12 are symmetrically provided on both sides of the inner bottom of the inclined groove 11, and limiting blocks 13 corresponding to the limiting grooves 12 are symmetrically provided on both sides of the bottom end of the lifting column 6, so that the cross-section of the lifting column 6 is T-shaped, and the lifting column 6 is limited in the limiting groove 12 by the limiting blocks 13, so as to prevent the lifting column 6 located on the lower side from falling off to the lower part under the action of gravity, thereby ensuring the stability of the adjustment process.

[0027] According to the preferred technical solution, 12-24 positioning holes 18 are evenly provided on the side surfaces of the turntable 7 and the variable diameter shaft 4, and the positioning holes 18 are distributed in a circular array with the center of the side surfaces of the turntable 7 and the variable diameter shaft 4 as the center. A positioning rod 14 made of a high-strength alloy material is arranged in the positioning hole 18. When adjusting the variable diameter shaft 4 by the turntable 7, the positioning rod 14 is first taken out to allow the turntable 7 to rotate freely, and then the turntable 7 is operated; after the adjustment is completed, the positioning rod 14 is inserted into the positioning holes 18 on the turntable 7 and the variable diameter shaft 4 in turn to fix the turntable 7 and the screw 9, etc., so that the screw 9, etc. will not rotate when the variable diameter shaft 4 drives the movable pulley 2 to rotate, thereby ensuring the stability of the vibration test process and the accuracy of the test results.

[0028] A further preferred technical solution is that the positioning rod 14 is L-shaped and is provided in plurality, preferably 2, 4 or 6, the ends of the plurality of positioning rods 14 are fixedly connected to the fixing block 15, and the positioning rods 14 are radially distributed around the fixing block 15. The plurality of positioning rods 14 are operated by the fixing block 5 to take out or insert the positioning holes 18, so that the turntable 7 and the screw 9 are fixed more firmly, further improving the stability of the vibration test process and the accuracy of the test results.

[0029] A further preferred technical solution is that the fixing block 15 is circular and is arranged concentrically with the turntable 7. A through hole is opened at the center of the fixing block 15. A stud 16 is fixedly arranged on the side surface of the turntable 7. The stud 16 passes through the through hole on the fixing block 15. The outer side of the stud 16 is threadedly connected with a nut 17. When the turntable 7 is positioned, the stud 16 also passes through the through hole of the fixing block 15 during the process of inserting the positioning rod 14 into the positioning hole 18. After the positioning rod 14 is inserted into place, the nut 17 is tightened to fix the fixing block 15 and each positioning rod 14, thereby avoiding the positioning rod 14 from falling out of the positioning hole 18 during the test. The operation is simple and easy to use.

[0030] Furthermore, grooves are evenly formed on the peripheral surface of the fixing block 15 , and anti-slip grooves are provided on the inner surface of the grooves, so that it is convenient for the staff to grasp the fixing block 15 , and the operation is more convenient.

[0031] The undisclosed parts in the present utility model are all prior art, and their specific structures, materials and working principles are not described in detail. Although the embodiments of the present utility model have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the attached claims and their equivalents.

Claims

1. A pulley structure for vibration frequency testing, characterized in that: The invention comprises a fixed belt pulley (1) and a detachable movable belt pulley (2), a belt (3) being arranged between the fixed belt pulley (1) and the movable belt pulley (2), the movable belt pulley (2) being sleeved on a diameter-changing rotating shaft (4), the diameter-changing rotating shaft (4) being rotatably arranged on an external vibration device, and the fixed belt pulley (1) being sleeved on a driving shaft of the vibration device.

2. A pulley structure for vibration frequency testing according to claim 1, characterized in that: A cylindrical slide groove is provided at the inner center of the variable diameter rotating shaft (4), a sliding column (10) is slidably arranged in the slide groove, a turntable (7) is fixedly arranged on the side surface of the variable diameter rotating shaft (4) away from the external vibration device, a screw rod (9) is installed at the center of the turntable (7), the screw rod (9) penetrates into the slide groove and is threadedly connected to a screw hole provided at the center of the side surface of the sliding column (10); inclined grooves (11) are evenly provided on the peripheral side surface of the sliding column (10), a lifting column (6) is slidably arranged in the inclined groove (11), the top end of the lifting column (6) passes through the through groove provided on the side surface of the variable diameter rotating shaft (4) and is connected to the arc support plate (5), and the movable pulley (2) is sleeved on the outer side of the arc support plate (5).

3. A pulley structure for vibration frequency testing according to claim 2, characterized in that: A rocking handle (8) is fixedly provided on the side surface of the turntable (7).

4. A pulley structure for vibration frequency testing according to claim 3, characterized in that: The crank handle (8) comprises a fixed rod and a rotating sleeve, wherein the fixed rod is fixedly arranged on the side surface of the rotating disk (7), and the rotating sleeve is rotatably arranged outside the fixed rod.

5. The pulley structure for vibration frequency testing according to claim 2, characterized in that: Two limiting grooves (12) are symmetrically provided on both sides of the inner bottom of the inclined groove (11), and limiting blocks (13) corresponding to the limiting grooves (12) are symmetrically provided on both sides of the bottom end of the lifting column (6).

6. The pulley structure for vibration frequency testing according to claim 2, characterized in that: A plurality of positioning holes (18) are evenly formed on the side surfaces of the rotating disk (7) and the variable diameter rotating shaft (4), the positioning holes (18) being distributed in a circular array with the center of the side surfaces of the rotating disk (7) and the variable diameter rotating shaft (4) as the center, and positioning rods (14) are arranged in the positioning holes (18).

7. A pulley structure for vibration frequency testing according to claim 6, characterized in that: The positioning rods (14) are L-shaped and are provided in plurality. The ends of the plurality of positioning rods (14) are all fixedly connected to the fixing block (15). The positioning rods (14) are radially distributed around the fixing block (15).

8. The pulley structure for vibration frequency testing according to claim 7, characterized in that: The fixing block (15) is circular and is arranged concentrically with the turntable (7). A through hole is provided at the center of the fixing block (15). A stud (16) is fixedly provided on the side surface of the turntable (7). The stud (16) passes through the through hole on the fixing block (15). A nut (17) is threadedly connected to the outer side of the stud (16).

9. A pulley structure for vibration frequency testing according to claim 8, characterized in that: Grooves are evenly arranged on the peripheral surface of the fixing block (15), and anti-slip grooves are arranged on the inner surface of the grooves.

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