A low-inertia exciter

Abstract

The present invention discloses a low-inertia vibrator, which includes a vibration shaft, a movable eccentric sleeve sleeved on the vibration shaft, and limiting blocks located at both ends of the vibration shaft; the movable eccentric sleeve is located between the limiting blocks, and the axial length of the movable eccentric sleeve is much larger than the sum of the axial lengths of the two limiting blocks. In the vibration state, the limiting blocks are used to drive the movable eccentric sleeve to rotate. The present invention can reduce the moment of inertia.

Description

Technical Field

[0001] The present invention relates to the technical field of construction machinery, and specifically relates to a low-inertia vibrator. Background Art

[0002] Vibratory rollers are mainly used for compacting subgrades and pavement materials. During operation, they need to compact back and forth, and the excitation system needs to start and stop repeatedly. The vibrator is a key component inside the steel wheel. It uses its own eccentric mechanism to generate an excitation force under high-speed rotation, and combines its own structure for limit control to complete the switching between large-amplitude operation and small-amplitude operation, realizing two amplitudes of large excitation force and small excitation force.

[0003] As Figure 1 shown, the current mainstream vibrators mainly include an excitation shaft, four fixed eccentric blocks, two movable eccentric blocks, and two sets of limiting devices. The limiting device consists of a cylindrical limiting pin and a limiting pin mounting hole. The limiting pin mounting hole is directly machined at the edge position of the fixed eccentric block. The limiting pin is welded and installed between the limiting pin mounting holes on the two fixed eccentric blocks. The two fixed eccentric blocks are welded to the end of the excitation shaft. The movable eccentric block is placed between the two fixed eccentric blocks. When the operation starts, the excitation shaft rotates at high speed driven by the excitation motor, driving the fixed eccentric block and the limiting pin to rotate at high speed, hitting the movable eccentric block with a large impact load, and then pushing the movable eccentric block to rotate together, thereby generating an excitation force for operation. When the excitation shaft rotates forward and backward, the fixed eccentric block and the movable eccentric block will present different relative positions, thereby realizing the switching between large and small vibrations.

[0004] This kind of vibrator has a large moment of inertia, a large number of parts, and a weak reliability of the limiting structure. First of all, a large moment of inertia brings two disadvantages. One is that the energy consumption of the entire excitation system is large. During high-speed rotation, the hydraulic system needs to provide more energy to maintain its high-speed rotation. The other is the slow start-up response and a long start-up waiting time. If the start-up time is to be reduced, a vibration motor with a larger power needs to be equipped to provide sufficient torque at the moment of start-up and switching moments, but this will increase the vehicle cost. Secondly, a large number of parts will result in relatively more processes and high manufacturing costs. Thirdly, the reliability of the limiting structure is not strong. When switching between the large-amplitude and small-amplitude operation states and stopping vibration, the movable eccentric block collides with the limiting pin, generating a large impact force. The method of using the limiting pin for limiting, on the one hand, has a small limiting contact area itself, and on the other hand, the welding area between the limiting pin and the fixed eccentric block belongs to the weak strength area. Under the action of the impact load, large contact stresses will be generated, exacerbating the danger of the structure, thus directly affecting the reliability and durability of the excitation structure. Summary of the Invention

[0005] To solve the deficiencies in the prior art, the present invention provides a low-inertia vibrator, which solves the problem of large moment of inertia.

[0006] To achieve the above object, the present invention adopts the following technical solution: a low-inertia vibrator, comprising a vibration shaft, a movable eccentric sleeve sleeved on the vibration shaft, and limiting blocks located at both ends of the vibration shaft; the movable eccentric sleeve is located between the limiting blocks, and the axial length of the movable eccentric sleeve is much greater than the sum of the axial lengths of the two limiting blocks. In the vibration state, the limiting blocks are used to drive the movable eccentric sleeve to rotate.

[0007] Further, the inner side wall of the movable eccentric sleeve is close to the outer side wall of the vibration shaft.

[0008] Further, the movable eccentric sleeve includes a sleeve and connecting blocks arranged at both ends of the sleeve. A convex block is arranged on the outer peripheral surface of the sleeve, and the connecting blocks are used to contact the limiting blocks.

[0009] Further, the convex block is an arc-shaped convex structure.

[0010] Further, a groove is arranged on the outer peripheral surface of the movable eccentric sleeve opposite to the convex block.

[0011] Further, the connecting block includes a ring and a protrusion fixed on the ring. The ring is fixedly connected to the end of the sleeve of the movable eccentric sleeve, and contact surfaces for contacting the limiting blocks are arranged on both sides of the protrusion.

[0012] Further, the included angle between the two contact surfaces is 120°.

[0013] Further, the limiting block includes a fixing part and a limiting part connected to the fixing part. Limiting surfaces for contacting the connecting block are arranged on both sides of the limiting part.

[0014] Further, the included angle between the two limiting surfaces is 120°.

[0015] Further, a first groove corresponding to the limiting block is arranged on the vibration shaft, a second groove corresponding to the first groove is arranged on the limiting block, and a limiting key is arranged between the first groove and the second groove.

[0016] The beneficial effects of the present invention:

[0017] The axial length of the movable eccentric sleeve of the present invention is much greater than the sum of the axial lengths of the two limit blocks, that is, the length of the movable eccentric sleeve is close to the length of the excitation shaft, so that the mass of the movable eccentric sleeve is evenly distributed along the axis, and the eccentric radius is small. Without changing the exciting force, the moment of inertia of the vibrator is reduced. In this way, during the rotation of the vibrator, on the one hand, the energy consumption will be reduced and the fuel consumption will be decreased. On the other hand, the vibration start-up waiting time is short and the operation response is fast; the limit blocks are arranged at both ends of the excitation shaft, and the structure of the limit blocks themselves is used to limit the movable eccentric sleeve, so there is no need to separately add a limiting structure, reducing the number of parts, and the corresponding processing procedures and assembly time will also be reduced; moreover, the limit blocks themselves can provide a large limiting contact area for the movable eccentric sleeve, reducing the stress concentration on the contact surface;

[0018] The inner side wall of the movable eccentric sleeve is close to the outer side wall of the excitation shaft, so that the distance between the inner side wall of the movable eccentric sleeve and the outer side wall of the excitation shaft is infinitely small, further reducing the eccentric radius and further reducing the moment of inertia;

[0019] Connecting blocks are arranged at both ends of the movable eccentric sleeve and are used in cooperation with the limit blocks. There are convex blocks on the outer peripheral surface of the movable eccentric sleeve, ensuring the eccentricity of the movable eccentric sleeve;

[0020] There is a groove on the outer peripheral surface of the movable eccentric sleeve opposite to the convex block, further ensuring the eccentricity of the movable eccentric sleeve;

[0021] There is a first groove corresponding to the limit block on the excitation shaft, a second groove corresponding to the first groove on the limit block, and a limit key is arranged between the first groove and the second groove, further strengthening the fixed bearing effect of the limit block. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the vibrator in the large vibration operation state in the embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of the vibrator in the small vibration operation state in the embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of the excitation shaft of the vibrator in the embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of the assembly of the limit key and the excitation shaft of the vibrator in the embodiment of the present invention;

[0026] Figure 5 is a schematic diagram of the drive side limit block in the embodiment of the present invention;

[0027] Figure 6 is a schematic diagram of the vibration side limit block structure in the embodiment of the present invention;

[0028] Figure 7 It is a schematic structural diagram of the movable eccentric sleeve in the embodiment of the present invention;

[0029] Figure 8 It is the front view of the movable eccentric sleeve in the embodiment of the present invention;

[0030] Wherein, 1 - drive - side limit block, 2 - movable eccentric sleeve, 3 - vibration - side limit block, 4 - excitation shaft, 5 - first groove on the drive side, 6 - first groove on the vibration side, 7 - drive - side limit key, 8 - vibration - side limit key, 9 - large - vibration limit surface on the drive side, 10 - second groove on the drive side, 11 - small - vibration limit surface on the drive side, 12 - large - vibration limit surface on the vibration side, 13 - second groove on the vibration side, 14 - small - vibration limit surface on the vibration side, 15 - groove, 16 - drive - side stepped sleeve, 17 - convex block, 18 - vibration - side stepped sleeve, 19 - small - vibration contact surface of the drive - side stepped sleeve, 20 - small - vibration contact surface of the vibration - side stepped sleeve, 21 - large - vibration contact surface of the drive - side stepped sleeve, 22 - large - vibration contact surface of the vibration - side stepped sleeve, 23 - circular ring, 24 - protrusion, 25 - fixing part, 26 - limiting part. Detailed implementation manners

[0031] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and cannot be used to limit the protection scope of the present invention.

[0032] Embodiment 1:

[0033] As Figure 1 , 2 shown, a low - moment - of - inertia vibrator includes: an excitation shaft 4, a movable eccentric sleeve 2 sleeved on the excitation shaft, and limit blocks located at both ends of the excitation shaft. The movable eccentric sleeve is located between the limit blocks, and the axial length of the movable eccentric sleeve is much larger than the sum of the axial lengths of the two limit blocks. In the vibration state, the limit blocks are used to drive the movable eccentric sleeve to rotate.

[0034] The two limit blocks can be arranged mirror - symmetrically on the same excitation shaft;

[0035] The movable eccentric sleeve 2 includes a sleeve and connecting blocks provided at both ends of the sleeve. The connecting blocks are used to contact the limit blocks. In this way, under the vibration state, the limit blocks drive the connecting blocks to rotate, thereby driving the movable eccentric sleeve to rotate. A convex block 17 is provided on the outer peripheral surface of the movable eccentric sleeve 2 to ensure the eccentric mass of the movable eccentric sleeve. The axial length of the convex block may be the same as that of the sleeve. The convex block 17 is an arc-shaped convex structure or may be of other shapes. A groove 15 is provided on the outer peripheral surface of the movable eccentric sleeve on the opposite side of the convex block. Preferably, the groove is provided in the middle. The groove is strip-shaped, and the provided groove can further ensure the eccentric mass of the movable eccentric sleeve. The moment of inertia and the exciting force can be adjusted by adjusting the sizes of the convex block and the groove for different tonnage models. The two connecting blocks are mirror-symmetrically arranged on the movable eccentric sleeve.

[0036] The axial dimension of the movable eccentric sleeve is much larger than the sum of the axial dimensions of the two limit blocks. In the small vibration state, the static eccentricity is the static eccentricity of the movable eccentric sleeve minus the static eccentricity of the two limit blocks.

[0037] As Figure 7 and 8 As shown, the connecting block is a stepped sleeve. The stepped sleeve includes a circular ring 23 and a protrusion 24 fixed on the circular ring. The circular ring is fixedly connected to the end of the sleeve of the movable eccentric sleeve. Contact surfaces for contacting the limit blocks are provided on both sides of the protrusion 24.

[0038] Specifically, the stepped sleeve includes a driving-side stepped sleeve 16 and a vibrating-side stepped sleeve 18. The driving-side stepped sleeve 16 has a large-vibration contact surface 21 and a small-vibration contact surface 19 of the driving-side stepped sleeve. The vibrating-side stepped sleeve 18 has a large-vibration contact surface 22 and a small-vibration contact surface 20 of the vibrating-side stepped sleeve. The included angles between the large-vibration contact surfaces and the included angles between the small-vibration contact surfaces are both 120 degrees.

[0039] As Figure 5 and 6 As shown, the limit block is T-shaped and arc-shaped, including a fixing part 25 and a limiting part 26 connected to the fixing part 25. A limiting surface is provided on the side of the limiting part 26. In the vibration state, the limiting surface contacts the contact surface of the protrusion 24 of the connecting block, so that the limit block drives the movable eccentric sleeve to rotate.

[0040] Specifically, the limit block includes a driving-side limit block 1 and a vibrating-side limit block 3. The limiting surfaces of the driving-side limit block 1 include a large-vibration limiting surface 9 and a small-vibration limiting surface 11 of the driving side. The limiting surfaces of the vibrating-side limit block 3 include a large-vibration limiting surface 12 and a small-vibration limiting surface 14 of the vibrating side. The driving-side limit block 1 and the vibrating-side limit block 3 are welded and fixed on the excitation shaft 4. The included angles between the large-vibration limiting surfaces and the included angles between the small-vibration limiting surfaces are both 120 degrees.

[0041] The functions of the large-vibration limiting surface and the small-vibration limiting surface are to limit the eccentric sleeve in the large-vibration state and the small-vibration state, realizing the switching between large vibration and small vibration. The advantages of this structure are as follows: First, it increases the limiting contact surface and reduces the contact stress caused by impact loads. Second, it directly uses the structure of the limiting block itself for limiting, eliminating the need to add a separate limiting structure and reducing the number of parts.

[0042] Method for assembling the vibrator: Weld and fix the driving-side limiting block 1 on the vibrating shaft 4, then insert the movable eccentric sleeve from the right end, and then weld and fix the vibrating-side limiting block 3 on the vibrating shaft 4.

[0043] As Figure 1 shown, during large vibration, the vibrating shaft 4 rotates clockwise. Since the driving-side limiting block 1 and the vibrating-side limiting block 3 are welded and fixed on the vibrating shaft 4, the clockwise rotation of the vibrating shaft 4 also drives the driving-side limiting block 1 and the vibrating-side limiting block 3 to rotate together. At this time, the driving-side large-vibration limiting surface 9 of the driving-side limiting block 1 will touch the driving-side large-vibration contact surface 21 on the driving-side stepped sleeve 16, and the vibrating-side large-vibration limiting surface 12 will touch the vibrating-side large-vibration contact surface 22 on the vibrating-side stepped sleeve 18. At this time, the vibrating-side limiting block 3, the driving-side limiting block 1, and the arc-shaped convex block 17 of the movable eccentric sleeve 2 are all on the same side. At this time, the eccentric radius of the vibrator is large, and the vibrator generates a large exciting force, forming a large-vibration working state. As Figure 2 shown, during small vibration, the vibrating shaft 4 rotates counterclockwise. Since the driving-side limiting block 1 and the vibrating-side limiting block 3 are welded and fixed on the vibrating shaft 4, the counterclockwise rotation of the vibrating shaft 4 also drives the driving-side limiting block 1 and the vibrating-side limiting block 3 to rotate together. At this time, the small-vibration limiting surface 11 of the driving-side limiting block 1 will touch the small-vibration contact surface 19 of the driving-side stepped sleeve 16, and at the same time, the small-vibration limiting surface 14 of the vibrating-side limiting block 3 will touch the small-vibration contact surface 20 of the vibrating-side stepped sleeve. At this time, the driving-side limiting block 1 and the vibrating-side limiting block 3 are on the same side, and the arc-shaped convex block of the movable eccentric sleeve 2 is on the opposite side. At this time, the eccentric radius of the vibrator decreases, and the exciting force generated by the vibrator is small, forming a small-vibration working state.

[0044] The present invention can fully meet the usage requirements of vibrating steel wheels. On the one hand, it can achieve the purpose of low rotational inertia while keeping the exciting force unchanged. In this way, the startup waiting time before operation will be reduced, the switching between the large vibration operation state and the small vibration operation state will be more flexible and convenient, and the energy consumption during high-speed rotation will also be reduced. On the other hand, the structure of the limit block itself can be used for limiting, without the need to add an additional limit pin structure, reducing the number of parts, reducing the connection pairs between parts, and avoiding the unreliability brought by excessive connection pairs. At the same time, the welds at both ends of the limit pin shaft are also omitted, reducing the processing procedures and avoiding the unreliability factors brought by weld defects such as weld internal stress. Finally, the limit block itself can provide a large limit contact area for the movable eccentric sleeve, reducing the stress concentration on the contact surface.

[0045] Embodiment 2:

[0046] Based on Embodiment 1, the fixed bearing effect of the limit block is further enhanced.

[0047] A first groove corresponding to the limit block is provided on the excitation shaft 4, a second groove corresponding to the first groove is provided on the limit block, a limit key is provided between the first groove and the second groove, and the first groove, the second groove and the limit key are used in interference fit, so that the limit key can not only play a role in positioning the limit block, but also share part of the impact load of the movable eccentric sleeve, reduce the impact stress of the limit block weld, and enhance the reliability of the structure. Preferably, the second groove is located on the contact surface of the limiting part 26 in contact with the excitation shaft. Of course, it can also be located on the contact surface of the fixing part 25 in contact with the excitation shaft;

[0048] Specifically, as Figure 3 and 4 shown, the first groove includes: a driving-side first groove 5 and a vibrating-side first groove 6, the second groove includes: a driving-side second groove 10 and a vibrating-side second groove 13, and the limit key includes: a driving-side limit key 7 and a vibrating-side limit key 8; the driving-side first groove 5 and the vibrating-side first groove 6 are respectively used to position and fix the driving-side limit key and the vibrating-side limit key;

[0049] Method for assembling the vibrator: The driving-side limit key 7 is assembled in the driving-side first groove 5, the driving-side second groove 10 is hot-fitted on the driving-side limit key 7, so that the driving-side limit block 1 is positioned, and finally it is welded and fixed on the excitation shaft 4. Then, the movable eccentric sleeve is inserted from the right end, the vibrating-side limit key 8 is fixed in the vibrating-side first groove 6, and the vibrating-side second groove 13 on the arc concave surface side of the vibrating-side limit block 3 is hot-fitted on the vibrating-side limit key 8, so that the vibrating-side limit block 3 is positioned, and then it is welded and fixed on the excitation shaft 4.

[0050] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A low moment of inertia vibrator, characterized in that: It includes an excitation shaft (4), a movable eccentric sleeve (2) sleeved on the excitation shaft, and limit blocks located at both ends of the excitation shaft; the movable eccentric sleeve is located between the limit blocks, and the axial length of the movable eccentric sleeve is much greater than the sum of the axial lengths of the two limit blocks. In the vibrating state, the limit blocks are used to drive the movable eccentric sleeve to rotate; The movable eccentric sleeve (2) includes a sleeve and connection blocks arranged at both ends of the sleeve. A convex block (17) is arranged on the outer peripheral surface of the sleeve, and the connection blocks are used to contact the limit blocks; The connection block includes a ring (23) and a protrusion (24) fixed on the ring. The ring is fixedly connected to the end of the sleeve of the movable eccentric sleeve, and contact surfaces for contacting the limit blocks are arranged on both side portions of the protrusion; The limit block includes a fixing portion (25) and a limiting portion (26) connected to the fixing portion. Limiting surfaces for contacting the connection blocks are arranged on both side portions of the limiting portion (26).

2. A low-inertia vibrator according to claim 1, characterized in that: The inner side wall of the movable eccentric sleeve is close to the outer side wall of the excitation shaft.

3. A low moment of inertia vibrator according to claim 1, characterized in that: The convex block (17) is an arc-shaped convex structure.

4. A low-inertia vibrator according to claim 1, characterized in that: The movable eccentric sleeve (2) is provided with a groove on the outer peripheral surface opposite to the convex block.

5. A low rotational inertia vibrator according to claim 1, characterized in that: The included angle between the two contact surfaces is 120°.

6. A low rotational inertia vibrator according to claim 1, characterized in that: The included angle between the two limiting surfaces is 120°.

7. A low-inertia vibrator according to any one of claims 1 to 6, characterized in that: A first groove corresponding to the limit block is arranged on the excitation shaft, a second groove corresponding to the first groove is arranged on the limit block, and a limit key is arranged between the first groove and the second groove.

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