Closed composite vibration exciter

Abstract

The invention relates to the technical field of mechanical vibration application, in particular to a closed type compound vibration exciter which comprises a driving shaft system, a driven shaft system group I, a driven shaft system group II, a left box body and a right box body. The driving shaft system, the driven shaft system group I and the driven shaft system group II are arranged in the vibration exciter box body, the driven shaft system group I and the driven shaft system group II are vertically crossed in a 45-degree inclined direction and are arranged front and back, and the driving shaft system is arranged on one side of the driven shaft system group I and one side of the driven shaft system group II; and two symmetrical 45-degree eccentric blocks are arranged on the driven shaft system group I, and two symmetrical minus 45-degree eccentric blocks are arranged on the driven shaft system group II. The vibrating trough has the beneficial effects that materials on the vibrating body can be subjected to linear exciting force in two directions, so that the loose degree of bulk material particles in the vibrating trough is enhanced; and the separation rate and the screening rate of the industrial mixed particles are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical vibration applications, and in particular to a closed composite vibration exciter. Background Art

[0002] An exciter is a device used to generate periodic vibration or excitation. It is widely used in mining, metallurgy, agriculture, chemical industry and other fields of bulk materials. Its core function is to achieve bulk material screening, sorting, transportation and other operations through controllable vibration.

[0003] Traditional inertial vibrators generally achieve unidirectional vibrations in a plane, such as circular, linear, or elliptical. The vibrators used are single, dual, or triple. Single vibrators achieve circular vibrations, dual vibrators achieve combined linear vibrations, and triple vibrators achieve combined elliptical vibrations through forced gears. However, these vibration modes are all single vibrations with a single excitation force direction. This results in weak material looseness, low material separation, and low screening efficiency.

[0004] Patent publication number CN117123465A discloses a composite vibrator using a gear-driven eccentric block. However, the vibration is driven by multiple gears, resulting in different frequencies and difficulty in ensuring vibration adjustment. Furthermore, the vibration has phase differences, making the resulting vibration stability difficult to control and the excitation force adjustment complex. Furthermore, the patent's transmission system is an open transmission, so heat dissipation and lubrication of the gear transmission and rolling bearing lubrication are not considered. This places relatively stringent requirements on the operating environment of the composite vibrator and has a narrow scope of application. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the present invention provides a closed composite vibration exciter, in which a driving shaft system and a driven shaft system group I and a driven shaft system group II arranged vertically at 45 degrees on both sides are arranged in the exciter box, a double row of driving gears are provided on the driving shaft system, and the double row of driving gears are connected to the gears on the driven shaft system group I and the driven shaft system group II through gear transmission meshing cooperation, the gear transmission ratio in two directions is 1:1, the excitation frequency ratio of the excitation force in two directions is 1:1, and symmetrically arranged eccentric blocks are provided on the driven shaft system group I and the driven shaft system group II to reduce the phase difference to zero, reduce the difficulty of vibration adjustment, improve vibration efficiency, and improve vibration stability.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A closed composite vibration exciter comprises a driving shaft system, a driven shaft system group I, a driven shaft system group II, a left housing, a right housing, a cooling and lubricating oil pipe, a breather, an oil drain pipe and flange bolts. The left housing and the right housing are connected by flange bolts to form an exciter housing. The driving shaft system, the driven shaft system group I and the driven shaft system group II are arranged in the exciter housing. The driven shaft system group I and the driven shaft system group II are arranged vertically and crosswise in a 45° direction, and the driving shaft system is arranged on one side of the driven shaft system group I and the driven shaft system group II; the driving shaft system is provided with two rows of driving gears with the same module and number of teeth, which are respectively gear-driven with the driven shaft system group I and the driven shaft system group II; the driven shaft system group I is provided with a symmetrical 45° eccentric block, and the driven shaft system group II is provided with a symmetrical negative 45° eccentric block; the cooling and lubricating oil pipe is provided in the exciter housing, and a breather and an oil drain pipe are provided on one side of the exciter housing.

[0008] Furthermore, the driving shaft system includes a driving shaft, a front driving gear, a rear driving gear and a tapered roller bearing. The front driving gear and the rear driving gear are arranged in parallel in the transmission section of the driving shaft through a flat key, and the driving shaft end of the driving shaft extends out of the exciter box through a transparent cover.

[0009] Furthermore, the driven shaft system group I includes two driven shaft systems with the same structural arrangement, the driven shaft system including a driven shaft, a driven gear and a 45° eccentric block, the transmission section of the driven shaft is provided with a driven gear and a 45° eccentric block, the 45° eccentric block is provided on both sides of the driven gear, and both ends of the driven shaft are provided on the exciter box through tapered roller bearings; the two driven shaft systems are arranged in parallel along a 45° direction and are connected through gear transmission meshing, the gear transmission of the driven shaft system is driven by meshing with the front row driving gear of the driving shaft system, and the module and number of teeth of the driven gear are the same as those of the front row driving gear; the 45° eccentric blocks provided on the two driven shaft systems are arranged symmetrically along the gear transmission meshing center line.

[0010] Furthermore, the driven shaft system group II includes two driven shaft systems II with the same structural arrangement, the driven shaft system II includes a driven shaft II, a driven gear II and a negative 45° eccentric block, the transmission section of the driven shaft II is provided with a driven gear II and a negative 45° eccentric block, the negative 45° eccentric block is provided on both sides of the driven gear II, and both ends of the driven shaft II are provided on the exciter box through tapered roller bearings; the two driven shaft systems II are arranged in parallel along the negative 45° direction, and the driven gear IIs on the two driven shaft systems II are meshed for transmission, and the meshing transmission of the driven gear II of the driven shaft system II is driven by the meshing of the rear driving gear of the driving shaft system, and the module and number of teeth of the driven gear II and the rear driving gear are the same; the negative 45° eccentric blocks provided on the two driven shaft systems II are symmetrically arranged along the meshing center line of the gear transmission.

[0011] Furthermore, an oil deflector is provided on the inner side of each tapered roller bearing.

[0012] Furthermore, the driven shaft system group I and the driven shaft system group II are sealed in the exciter box through a cover.

[0013] Furthermore, the cooling and lubricating oil pipe is arranged at the center of the meshing gears of the driven shaft system group I and the driven shaft system group II.

[0014] Furthermore, a sealing rubber pad is provided between the left box body and the right box body.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1) Two mutually perpendicular linear exciting forces A1 and A2 are generated by a driving shaft system and a driven shaft system group I and a driven shaft system group II. The closed composite vibration exciter is installed on the vibrating body, so that the material on the vibrating body can be subjected to linear exciting forces in two directions, thereby enhancing the looseness of the bulk material particles in the vibrating trough and improving the sorting rate and screening rate of industrial mixed particles.

[0017] 2) The gears on the driving gear and the driven shaft system use the same module and number of teeth, the gear transmission frequency is the same, the vibration frequency is the same, the eccentric blocks are symmetrically set in the positive and negative 45° directions, the vibration phase difference is zero, reducing the difficulty of adjusting the exciting force, the exciting force adjustment is fast, the vibration efficiency is improved, and the vibration stability of the vibration trough is improved.

[0018] 3) The active shaft system, driven shaft system group I and driven shaft system group II composed of the vibrator are sealed in the vibrator box, which is convenient for transportation, maintenance and installation. The cooling and lubricating oil pipes are set at the center of the gear transmission, which makes cooling convenient and lubrication uniform. The use of the vibrator is not affected by the environment. The vibrator has a wide range of use and strong applicability.

[0019] 4) A large number of parts of the composite vibrator have the same structure, size and material, which enhances the interchangeability and versatility, makes maintenance and replacement convenient and highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a closed composite vibration exciter according to the present invention.

[0021] Figure 2 This is a schematic diagram of the gear transmission shaft system and the coordinate XOY main view structure of the present invention.

[0022] Figure 3 This is a top view of the gear transmission shaft system and coordinates XYZ according to the present invention.

[0023] Figure 4 This is a three-dimensional structural schematic diagram of the driven shaft system of the present invention.

[0024] Figure 5 Schematic diagram of the structure of the driven shaft 2 of the driven shaft system 2 of the present invention

[0025] Figure 6 This is a schematic diagram of the two- and three-dimensional structure of the driven shaft system of the present invention.

[0026] Figure 7 This is a schematic diagram of the three-dimensional structure of the active shaft system described in the present invention.

[0027] Figure 8 This is a schematic diagram of the three-dimensional structure of the driving shaft described in the present invention.

[0028] Figure 9 This is a schematic diagram of the three-dimensional structure of the transmission gear described in the present invention.

[0029] Figure 10 This is a schematic diagram of the three-dimensional structure of the eccentric block described in the present invention.

[0030] Figure 11 This is a schematic diagram of the three-dimensional structure of the right box body described in the present invention.

[0031] In the figure: 1. Left housing; 2. Sealing rubber gasket; 3. Flange bolts; 4. Right housing; 5. Cover; 6. Cooling and lubricating oil pipes; 7. Active shaft system; 7-1. Active shaft; 7-2. Active tapered roller bearing; 7-3. Active oil baffle; 7-4. Active gear; 7-5. Active shaft key; 8. Through cover; 9. Breather; 10. Driven shaft system 1; 10-1. Driven tapered roller bearing 1; 10- 2. Oil deflector plate 1; 10-3. Driven shaft 1; 10-4. 45° eccentric block; 10-5. Driven gear 1; 10-6. Sleeve 1; 10-7. Driven flat key; 11. Driven shaft system 2; 11-1. Driven tapered roller bearing 2; 11-2. Oil deflector plate 2; 11-3. Driven shaft 2; 11-4. Negative 45° eccentric block; 11-5. Driven gear 2; 11-6. Sleeve 2; 12. Oil drain hole. DETAILED DESCRIPTION

[0032] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0033] like Figures 1-11As shown, a closed composite vibration exciter includes an active shaft system 7, a driven shaft system group I, a driven shaft system group II, a left box body 1, a right box body 4, a cooling and lubricating oil pipe 6, a breather 9, a sealing rubber pad 2 and a flange bolt 3. The left box body 1 and the right box body 4 are connected by the flange bolt 3 to form an exciter box body. The active shaft system 7, the driven shaft system group I and the driven shaft system group II are arranged in the exciter box body. The driven shaft system group I and the driven shaft system group II are arranged in a vertical cross-arrangement at an oblique 45° direction. The active shaft system The shaft system 7 is arranged on one side of the driven shaft system group I and the driven shaft system group II; the driving shaft system 7 is provided with two front and rear rows of driving gears 7-5 with the same module and gear, which are respectively gear-driven with the driven shaft system group I and the driven shaft system group II, two symmetrical 45° eccentric blocks 10-4 are provided on the driven shaft system group I, and two symmetrical negative 45° eccentric blocks 11-4 are provided on the driven shaft system group II, a cooling and lubricating oil pipe 6 is provided in the exciter box, and a breather 9 and an oil drain pipe 12 are provided on one side of the exciter box.

[0034] The active shaft system consists of an active shaft 7-1, two active tapered roller bearings 7-2, two active oil deflectors 7-3, two active gears 7-4, and an active flat key 7-5. The axial positioning of the active tapered roller bearings 7-2 and active gears 7-4 is achieved by the stepped shoulder of the active shaft 7-1, while the circumferential positioning of the active gear 7-4 is achieved by the active flat key 7-5 fixed to the active shaft 7-1. The interference fit between the active tapered roller bearings 7-2 and the active shaft 7-1 is achieved. The two active gears 7-4 are arranged in two rows on the transmission section of the active shaft 7-1. The drive shaft end of the active shaft 7-1 extends out of the left housing 1 through the transparent cover 8. Active tapered roller bearings 7-2 are installed at the connection points between the active shaft 7-1 and the left and right housings 1 and 4 to resist the axial load generated when the composite vibration exciter is used at an angle. Active oil deflectors 7-3 are installed on the inner sides of the active tapered roller bearings 7-2 at both ends.

[0035] The driven shaft system group I includes two driven shaft systems 10 with the same structure, size and parts arrangement. The driven shaft system 10 includes two driven tapered roller bearings 10-1, an oil deflector 10-2, a driven shaft 10-3, two 45° eccentric blocks 10-4, a driven gear 10-5, a sleeve 10-6 and a driven flat key 10-7. The transmission section of the driven shaft 10-3 is provided with a driven gear 10-5 and a 45° eccentric block 10-4. The 45° eccentric block 10-4 is provided on both sides of the driven gear 10-5. Both ends of the driven shaft 10-3 are provided on the exciter housing through driven tapered roller bearings 10-1 to resist the axial load generated when the vibration exciter is tilted. An oil baffle 10-2 is provided inside the driven tapered roller bearings 10-1 on both sides. The two driven shafts 10 are arranged parallel to each other at 45°. The driven gear 10-5 on the upper right driven shaft 10-3 at 45° is externally meshed with the driven gear 10-5 on the lower left driven shaft 10-3. The front row driving gear 7-4 of the driving shaft system 7 is meshed with the upper right driven gear 10-5 of the driven shaft system group I to form a front row transmission chain; the driven gear 10-5 and the front row driving gear 7-4 are spur gears with the same module and number of teeth; the 45° eccentric blocks 10-4 set on the two driven shaft systems 10 are symmetrically arranged along the gear transmission meshing center line; the axial positioning of the driven tapered roller bearing 10-1, the driven gear 10-5, and the 45° eccentric block 10-4 is completed by the stepped shoulder of the driven shaft 10-3 and the sleeve 10-6, and the circumferential positioning is completed by the driven flat key 10-7 and the interference fit with the driven shaft 10-3.

[0036] The driven shaft system group II includes two driven shaft systems 11 with the same structure, size and parts arrangement. The driven shaft system 11 includes two driven tapered roller bearings 11-1, two oil baffles 11-2, a driven shaft 11-3, two negative 45° eccentric blocks 11-4, a driven gear 11-5, a sleeve 11-6 and a driven flat key 10-7. The driven flat keys 10-7 of all driven shaft systems are the same. The driven shaft system 11 includes a driven shaft 11-3, a driven gear 11-5 and a negative 45° eccentric block 11-4. The transmission section of the driven shaft 11-3 is provided with a driven gear 11-5 and a negative 45° eccentric block 11-4. The negative 45° eccentric block 11-4 is provided on both sides of the driven gear 11-5. Both ends of the driven shaft 11-3 are provided on the exciter housing through driven tapered roller bearings 11-1 to resist the axial load generated when the exciter is tilted. An oil baffle plate 11-2 is provided on the inner side of the driven tapered roller bearings 11-1 at both ends. The two driven shaft systems 11 are arranged in parallel along the negative 45° direction. The driven gear 11-5 on the upper left driven shaft 11-3 in the negative 45° direction is the same as that on the lower right driven shaft. The driven gear 2 11-5 on the second shaft 11-3 is externally meshed, and the rear row driving gear 7-4 of the driving shaft system 7 is meshed with the lower right driven gear 2 11-5 of the driven shaft system group II to form a rear transmission chain. The driven gear 2 11-5 and the rear row driving gear 7-4 are spur gears with the same module and number of teeth; the negative 45° eccentric blocks 11-4 set on the two driven shaft systems 2 11 are symmetrically arranged along the gear transmission meshing center line in the negative 45° direction; the axial positioning of the driven tapered roller bearing 2 11-1, the negative 45° eccentric block 11-4 and the driven gear 2 11-5 is completed by the stepped shoulder of the driving shaft 11-3 and the sleeve 2 11-6, and the circumferential positioning is completed by the driven flat key 10-7 and the interference fit with the driven shaft 2 11-3.

[0037] When the driving shaft system 7 rotates, the two driven shaft systems 10 of the driven shaft system group I rotate at the same speed and in opposite directions; the two driven shaft systems 11 of the driven shaft system group I rotate at the same speed and in opposite directions. The driving gear 7-4, the driven gear 1 10-5 and the driven gear 2 11-5 are spur gears with the same module and number of teeth.

[0038] The driven shaft system group I and the driven shaft system group II are sealed in the exciter box through a cover 5.

[0039] The cooling and lubricating oil pipe 6 is set at the center of the gear meshing of the driven shaft system group I and the driven shaft system group II. The gear meshing is lubricated and cooled by oil spraying. Due to the use of six gears for transmission, its transmission efficiency is low and cooling is required. The tapered roller bearings are lubricated with dry oil.

[0040] A sealing rubber pad 2 is provided between the left box body 1 and the right box body 4 for sealing.

[0041] The shape of the vibrator is a "turtle shape", and the right box body 4 is provided with mounting holes for the vibrator and cross ribs for strengthening the shell.

[0042] like Figures 1-11 As shown, the operating principle of a closed composite vibration exciter is as follows: the line connecting the two driven shafts 11-3 of driven shaft group II passes through the X-axis, and the line connecting the two driven shafts 10-3 of driven shaft group I passes through the Y-axis. The X-axis and Y-axis are perpendicular to form the XOY coordinate plane. XOY is perpendicular to the axes of the driving shaft system 7 and the driven shaft system and is located between the two rows of driving gears 7-4 of the driving shaft system 7. The 45° eccentric masses 10-4 on the two driven shafts 10 in driven shaft group I are identical in size, shape, and material. The negative 45° eccentric masses 11-4 on the two driven shafts 11 in driven shaft group II are identical in size, shape, and material. All driven shaft eccentric masses are arranged symmetrically about plane XOY. Therefore, the inertial force generated by the eccentric masses has a zero moment of inertia on plane XOY.

[0043] The XOZ plane passes through the axes of the two driven shaft systems 2 11 in the driven shaft system group II, and the YOZ plane passes through the axes of the two driven shaft systems 10 in the driven shaft system group I. The coordinate system XYZ is a spatial rectangular coordinate system.

[0044] Driven shaft system group I comprises two driven shaft systems 10 with identical structure, dimensions, and component arrangement. The front drive gear 7-4 of driving shaft system 7 meshes with the upper-right driven gear 10-5 of driven shaft system group I. The upper-right driven gear 10-5 within driven shaft system group I also meshes externally with the lower-left driven gear 10-5, forming the front drive chain. When driving shaft system 7 rotates, the two driven shaft systems 10 within driven shaft system group I rotate in opposite directions. The gear modules and tooth counts of driving shaft system 7 and driven shaft system group I 10 are identical, so the two driven shaft systems within driven shaft system group I 10 have the same rotational speed ω1.

[0045] The rear drive gear 7-4 of driving shaft system 7 externally meshes with the lower-right driven gear 11-5 of driven shaft system group II. The lower-right driven gear 11-5 within driven shaft system group II also meshes with the upper-left driven gear 11-5, forming the rear drive chain. When driving shaft system 7 rotates, the two driven shafts 11 within driven shaft system group II rotate in opposite directions. The gear modules and teeth of driving shaft system 7 and driven shaft system group II are identical, so the rotational speed ω2 of the two driven shafts 11 within driven shaft system group II is the same.

[0046] The spur gear modules and the number of teeth of all the driving shaft systems 7 and the driven shaft system groups I and II are the same, so ω=ω1=ω2.

[0047] The structure and material of the eccentric blocks in the driven shaft system group I are the same, so the mass m1 and eccentric distance r1 of the eccentric blocks are the same, so the centrifugal force m1r1ω generated by the eccentric blocks2 same.

[0048] Similarly, the structure and material of the eccentric blocks in the driven shaft group II are the same, so the mass m2 and eccentric distance r2 of the eccentric blocks are the same, so the centrifugal force m2r2ω generated by the eccentric blocks 2 same.

[0049] The 45° eccentric block 10-4 of the driven shaft system group I is symmetrical about the XOZ plane, and the negative 45° eccentric block 11-4 of the driven shaft system group II is symmetrical about the YOZ plane.

[0050] The centrifugal forces generated by the 45° eccentric mass 10-4 of the driven shaft system group I cancel each other out in the Y-axis direction, resulting in a linear excitation force A1 on the X-axis. Similarly, the centrifugal forces generated by the negative 45° eccentric mass 11-4 of the driven shaft system group II cancel each other out in the X-axis direction, resulting in a linear excitation force A2 on the Y-axis.

[0051] Since the XYZ coordinate system is a spatial rectangular coordinate system, the linear exciting force A1 synthesized by the driven shaft system group I and the linear exciting force A2 synthesized by the driven shaft system group II are perpendicular to each other.

[0052] The structure and material of the 45° eccentric block 10-4 in the driven shaft group I are the same, and the structure and material of the negative 45° eccentric block 11-4 in the driven shaft group II are the same, but the structure and material of the 45° eccentric block 10-4 in the driven shaft group I and the structure and material of the negative 45° eccentric block 11-4 in the driven shaft group II can be different, that is, m1≠m2, r1≠r2, that is, A1≠A2, and the amplitude of the exciting force of the compound exciter in the X and Y directions can be adjusted by only adjusting the specifications of the eccentric block.

[0053] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A closed composite vibration exciter, comprising a driving shaft system, a driven shaft system group I, a driven shaft system group II, a left housing, a right housing, cooling and lubricating oil pipes, a breather, a sealing rubber pad and flange bolts, characterized in that: The left box body and the right box body are connected by flange bolts to form an exciter box body. The driving shaft system, the driven shaft system group I and the driven shaft system group II are arranged in the exciter box body. The driven shaft system group I and the driven shaft system group II are arranged vertically and crosswise in a 45° direction, and the driving shaft system is arranged on one side of the driven shaft system group I and the driven shaft system group II; the driving shaft system is provided with two rows of front and rear driving gears with the same module and number of teeth, which are respectively gear-driven with the driven shaft system group I and the driven shaft system group II, and symmetrical 45° eccentric blocks are provided on the driven shaft system group I, and symmetrical negative 45° eccentric blocks are provided on the driven shaft system group II. Cooling and lubricating oil pipes are provided in the exciter box body, and a breather and an oil drain pipe are provided on one side of the exciter box body.

2. A closed composite vibration exciter according to claim 1, characterized in that: The driving shaft system includes a driving shaft, a front driving gear, a rear driving gear and a tapered roller bearing. The driving shaft is a stepped shaft structure. The front driving gear and the rear driving gear are arranged in parallel in the transmission section of the driving shaft through a flat key. The driving shaft end of the driving shaft extends out of the exciter box through a transparent cover.

3. A closed composite vibration exciter according to claim 1, characterized in that: The driven shaft system group I includes two driven shaft systems with the same structural arrangement. The driven shaft system includes a driven shaft, a gear and a 45° eccentric block. The driven shaft is a stepped shaft structure. The transmission section of the driven shaft is provided with a gear and a 45° eccentric block. The 45° eccentric block is provided on both sides of the gear. Both ends of the driven shaft are provided on the exciter housing through tapered roller bearings. The two driven shaft systems are arranged in parallel along a 45° direction. The gears on the two driven shaft systems are meshed and driven. The meshing transmission of the gear of the driven shaft is driven by the front row driving gear of the driving shaft. The module and number of teeth of the gear and the front row driving gear are the same. The 45° eccentric blocks provided on the two driven shaft systems are arranged symmetrically along the center line of the gear transmission meshing.

4. A closed composite vibration exciter according to claim 1, characterized in that: The driven shaft system group II includes two driven shaft systems II with the same structural arrangement, the driven shaft system II includes a driven shaft II, a gear II and a negative 45° eccentric block, the driven shaft II is a stepped shaft structure, the transmission section of the driven shaft II is provided with a gear II and a negative 45° eccentric block, the negative 45° eccentric block is provided on both sides of the gear II, and both ends of the driven shaft II are provided on the exciter box through tapered roller bearings; the two driven shaft systems II are arranged in parallel along the negative 45° direction, and the gear IIs on the two driven shaft systems II are meshed and driven, the meshing transmission of the gear II of the driven shaft system is driven by the meshing of the rear driving gear of the driving shaft system, and the module and number of teeth of the gear II and the rear driving gear are the same; the negative 45° eccentric blocks provided on the two driven shaft systems II are arranged symmetrically along the meshing center line of the gear transmission.

5. A closed composite vibration exciter according to claim 3 or 4, characterized in that: An oil retaining plate is provided on the inner side of each tapered roller bearing.

6. A closed composite vibration exciter according to claim 1, characterized in that: The driven shaft system group I and the driven shaft system group II are sealed in the exciter box through a cover.

7. The closed composite vibration exciter according to claim 1, characterized in that: The cooling and lubricating oil pipe is arranged at the center of the meshing gears of the driven shaft system group I and the driven shaft system group II.

8. The closed composite vibration exciter according to claim 1, characterized in that: A sealing rubber pad is provided between the left box body and the right box body for sealing.

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