A multi-layer composite shock pad for traction machines

Abstract

The utility model discloses a kind of traction machine multilayer composite shock pads, comprising: upper steel plate, first threaded hole is arranged on it, and first threaded hole is trapezoidal threaded hole;Interlayer steel plate, a plurality of through holes are arranged on it, rubber sleeve is arranged in through hole, first rubber plate is arranged between interlayer steel plate and upper steel plate, first bolt is screw-connected in first threaded hole after passing through rubber sleeve, first rubber plate, and the head of first bolt contacts rubber sleeve;Lower steel plate, second threaded hole is arranged on it, and second rubber plate is arranged between lower steel plate and interlayer steel plate.The utility model compared with prior art, solve the problem that existing shock absorber cannot effectively realize large load goods elevator system vibration suppression.

Description

Technical Field

[0001] This utility model relates to the field of elevator vibration reduction technology, and in particular to a multi-layer composite vibration damping pad for traction machines. Background Technology

[0002] In modern industrial production and high-rise logistics transportation scenarios, freight elevators generally adopt a traction ratio configuration of 4:1 to 12:1, and their main engine speed can reach 2 to 6 times that of conventional passenger elevators. Especially under load conditions of 2000 kg or more, the traditional rigid connection method causes mechanical vibration to be transmitted through the building structure, generating broadband noise pollution of up to 65 dB or more in the top-floor machine room area, which seriously affects the use of the functional areas adjacent to the machine room.

[0003] Current elevator vibration reduction technology is mainly developed for passenger elevators with a capacity of 1600 kg, and its vibration reduction pad products are difficult to adapt to freight elevators in terms of key parameters such as damping coefficient and load-bearing strength.

[0004] The reason is that, compared to passenger elevators, freight elevators have three unique differences:

[0005] First, the rated load of the freight elevator exceeds the passenger elevator standard by more than 25%;

[0006] Secondly, the proportion of high-frequency vibration components generated by high traction ratio drive systems increases significantly;

[0007] Third, the continuous operating time of elevators in industrial sites can be 3 to 5 times that of passenger elevators.

[0008] Therefore, existing vibration damping devices commonly suffer from technical problems such as rapid fatigue failure and narrow vibration isolation bandwidth in freight elevator applications.

[0009] Of particular concern is that in a 2000 kg freight elevator system with a 4:1 traction ratio, actual measurements revealed that when the car is at the top floor level, the vibration acceleration amplitude on the traction machine side can reach 2.8 times that at the bottom floor, accompanied by structural noise amplification in the 800-1200 Hz frequency band. This phenomenon creates a dual contradiction in industrial plants and mixed-use office buildings: the need to ensure the transportation requirements of heavy equipment must be met while simultaneously satisfying increasingly stringent acoustic environmental standards (such as the 60 dB daytime limit for Class II areas specified in GB3096-2008). Utility Model Content

[0010] The purpose of this invention is to provide a multi-layer composite shock-absorbing pad for traction machines to solve the problem that existing shock-absorbing devices cannot effectively suppress vibrations in heavy-duty freight elevator systems.

[0011] To achieve the above objectives, this utility model adopts the following technical solution: a multi-layer composite shock-absorbing pad for a traction machine, comprising:

[0012] The upper steel plate has a first threaded hole, which is a trapezoidal threaded hole.

[0013] A sandwich steel plate has several through holes, and a rubber sleeve is installed in the through holes. A first rubber plate is installed between the sandwich steel plate and the upper steel plate. A first bolt passes through the rubber sleeve and the first rubber plate and is threaded into the first threaded hole. The head of the first bolt contacts the rubber sleeve.

[0014] The lower steel plate has a second threaded hole. A second rubber plate is provided between the lower steel plate and the sandwich steel plate. The second rubber plate has a second clearance hole for receiving the head of the first bolt. The second bolt passes through the sandwich steel plate and the second rubber plate and is threaded into the second threaded hole. The first rubber plate has a first clearance hole for receiving the head of the second bolt.

[0015] As a further description of the above technical solution:

[0016] The upper steel plate is provided with a first notch corresponding to the first clearance hole, and a first circular rubber pad is provided inside the first notch.

[0017] As a further description of the above technical solution:

[0018] The first notch is interference-fitted with the first circular rubber pad.

[0019] As a further description of the above technical solution:

[0020] The first circular pad is an EPDM rubber pad.

[0021] As a further description of the above technical solution:

[0022] Both the first and second rubber sheets are polyurethane sheets.

[0023] As a further description of the above technical solution:

[0024] The sleeve is made of polyurethane.

[0025] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0026] 1. In this utility model, the shock-absorbing pad adopts an alternating "steel plate-rubber-steel plate" stacked structure. By alternating the arrangement of steel plates and rubber plates, a multi-level buffer unit is formed. Finite element analysis shows that compared with the traditional integral rubber pad, the vibration attenuation rate is increased by 62%, the load-bearing capacity is increased by 40%, and the stress distribution is more uniform.

[0027] 2. In this utility model, the composite shock-absorbing pad structure specifically designed for heavy-duty freight elevator systems, through multi-level damping coupling design, reduces the vibration transmission rate to less than 40% of the traditional solution while maintaining a load-bearing capacity of 150% safety factor. This effectively solves the broadband vibration transmission problem unique to high traction ratio freight elevators and achieves vibration suppression of heavy-duty freight elevator systems.

[0028] 3. This utility model effectively solves the technical bottlenecks of traditional shock absorption devices, such as unadjustable stiffness and insufficient high-frequency vibration attenuation, through innovative structural combination. It is particularly suitable for complex vibration conditions in the field of high-speed vertical transportation. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the structure of a multi-layer composite shock-absorbing pad for a traction machine. Figure 1 .

[0031] Figure 2 A schematic diagram of the structure of a multi-layer composite shock-absorbing pad for a traction machine. Figure 2 .

[0032] Figure 3 This is a cross-sectional view of a multi-layer composite shock-absorbing pad for a traction machine.

[0033] Legend:

[0034] 1. Upper steel plate; 2. Sandwich steel plate; 21. Rubber sleeve; 3. Lower steel plate; 4. First circular rubber pad; 5. First bolt; 51. Second bolt; 6. First rubber plate. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0036] Example 1

[0037] Please see Figure 1-3 This utility model provides a technical solution: a multi-layer composite shock-absorbing pad for a traction machine, comprising:

[0038] The upper steel plate 1 has a first threaded hole, which is a trapezoidal threaded hole.

[0039] The sandwich steel plate 2 has several through holes, and a rubber sleeve 21 is installed in the through holes. A first rubber plate 6 is installed between the sandwich steel plate 2 and the upper steel plate 1. The first bolt 5 passes through the rubber sleeve 21 and the first rubber plate 6 and is threaded into the first threaded hole. The head of the first bolt 5 contacts the rubber sleeve 21.

[0040] The lower steel plate 3 has a second threaded hole, which is a trapezoidal threaded hole. A second rubber plate is provided between the lower steel plate 3 and the sandwich steel plate 2. The second rubber plate has a second clearance hole for receiving the head of the first bolt 5. The second bolt 51 passes through the sandwich steel plate 2 and the second rubber plate and is threaded into the second threaded hole. The first rubber plate 6 has a first clearance hole for receiving the head of the second bolt 51.

[0041] The vibration damping pad adopts an alternating "steel plate-rubber-steel plate" laminated structure. By alternately arranging steel plates and rubber plates, multi-level buffer units are formed. Finite element analysis shows that compared to traditional integral rubber pads, the vibration attenuation rate is increased by 62%, the load-bearing capacity is increased by 40%, and the stress distribution is more uniform. The metal-rubber composite sandwich structure maintains a compression permanent deformation rate of <5% under long-term impact loads, a significant improvement over traditional rubber vibration damping pads (>15%), meeting the high-frequency usage requirements of industrial elevators exceeding 300 cycles per day.

[0042] When a vertical load is applied to the upper steel plate 1, the first rubber plate 6 undergoes axial compressive deformation, which is then converted into lateral shear force and transmitted to the second rubber plate through the sandwich steel plate 2. The preload of the first bolt 5 controls the initial compression of the first rubber plate 6, causing the system stiffness to exhibit nonlinear characteristics. The stiffness coefficient is 8MN / m under loads below 20kN, and increases to 15MN / m when the load exceeds 30kN. This composite vibration damping pad structure, specifically designed for heavy-duty freight elevator systems, reduces the vibration transmission rate to below 40% of traditional solutions while maintaining a 150% safety factor load capacity through multi-stage damping coupling design. This effectively solves the broadband vibration transmission problem unique to high traction ratio freight elevators, achieving vibration suppression for heavy-duty freight elevator systems.

[0043] The vibration damping pad, through its gradient composite structure design, increases its load-bearing capacity to more than 2.5 times that of traditional passenger elevator vibration damping pads (2000kg→5000kg instantaneous load), and its yield strength from the conventional 18MPa to 45MPa, effectively overcoming the problem of plastic deformation of the vibration damping pad caused by large load impacts in freight elevators. The failure protection mechanism reduces the system tilt angle from ≥2° in the event of unilateral elastomer failure to 0.3°, lowering the risk of imbalance by 82% and ensuring safe operation of the equipment under extreme conditions.

[0044] Employing 8.8-grade high-strength bolts (including bolt 5 and bolt 51) with precision-machined trapezoidal threaded holes, the preload torque can be precisely adjusted within the range of 120-150 N·m, achieving an adjustable preload mechanism. The bolt and threaded hole design reduces product disassembly and maintenance time to one-third that of traditional welded structures. By adjusting the bolt preload, the system's natural frequency can be adjusted within ±15% to adapt to different operating conditions.

[0045] Both the first rubber plate 6 and the second rubber plate are polyurethane plates, and the rubber sleeve 21 is a polyurethane sleeve. The damping pad overcomes the technical limitation of traditional damping pads where single-point failure leads to system imbalance by adopting a parallel topology architecture of multi-level elastic support units. When any elastic module (such as the polyurethane damper) undergoes plastic deformation or fracture, the remaining elastic units automatically compensate for the force distribution through three-dimensional force field reconstruction, ensuring that the tilt angle of the traction machine under extreme conditions is always controlled within the 0.5° safety threshold, reducing the risk of imbalance by up to 82% compared to traditional structures.

[0046] Working Principle: In the damping pad, the sandwich steel plate 2 and the upper steel plate 1 are axially fastened by the first bolt 5, which is a Φ20mm cylindrical head bolt. The bolt passes through the rubber sleeve 21 and the first rubber plate 6 before being screwed into the M18 standard threaded hole of the upper steel plate 1. The sandwich steel plate 2 and the lower steel plate 3 are similarly fastened by the second bolt 51. Under dynamic conditions, the three layers of steel plates form a multi-level constraint mechanism: the upper steel plate 1 bears the main compressive stress, the sandwich steel plate 2 guides the direction of shear force, and the lower steel plate 3 provides torsional support. The first bolt 5 and the second bolt 51 are arranged symmetrically back-to-back, so that the holes between the upper steel plate 1, the first rubber plate 6 and the lower steel plate 3, the second rubber plate form an asymmetrical honeycomb array. The asymmetrical honeycomb array design improves the load distribution uniformity by 60% and extends the fatigue life of the damping pad from the conventional 500,000 cycles to 2 million cycles.

[0047] Through innovative structural combination, it effectively solves the technical bottlenecks of traditional vibration damping devices, such as non-adjustable stiffness and insufficient high-frequency vibration attenuation, and is particularly suitable for complex vibration conditions in the field of high-speed vertical transportation.

[0048] Example 2

[0049] This embodiment further improves upon the above embodiment by providing the following technical solution: A first notch corresponding to the first clearance hole is provided on the upper steel plate 1, and a first circular rubber gasket 4 is provided within the first notch. The 35mm diameter circular rubber gasket fits into the circular notch of the upper steel plate 1, forming a double sealing system. Similarly, a second notch corresponding to the second clearance hole is provided on the lower steel plate 3, and a second circular rubber gasket is provided within the second notch.

[0050] The first circular rubber pad 4 undergoes radial deformation during vibration, effectively absorbing high-frequency micro-amplitude vibrations (>50Hz) while preventing external contaminants from penetrating the internal laminated structure. The second circular rubber pad works similarly.

[0051] The first notch is interference-fitted with the first circular rubber pad 4, effectively preventing the first circular rubber pad 4 from falling off. The installation of the second circular rubber pad on the lower steel plate 3 is carried out in the same way.

[0052] The first circular pad 4 is an EPDM rubber pad, and the dynamic sealing interference of the shock-absorbing pad is designed to be 0.5-0.8mm, forming a labyrinth-like sealing structure with the notch of the upper steel plate 1.

[0053] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A multi-layer composite shock-absorbing pad for a traction machine, characterized in that, include: A steel plate is provided on which a first threaded hole is provided, the first threaded hole being a trapezoidal threaded hole; A sandwich steel plate has several through holes, and a rubber sleeve is installed in each through hole. A first rubber plate is installed between the sandwich steel plate and the upper steel plate. A first bolt passes through the rubber sleeve and the first rubber plate and is threaded into the first threaded hole. The head of the first bolt contacts the rubber sleeve. A lower steel plate is provided with a second threaded hole. A second rubber plate is provided between the lower steel plate and the sandwich steel plate. The second rubber plate is provided with a second clearance hole for receiving the head of the first bolt. The second bolt passes through the sandwich steel plate and the second rubber plate and is threaded into the second threaded hole. The first rubber plate is provided with a first clearance hole for receiving the head of the second bolt.

2. The multi-layer composite shock-absorbing pad for a traction machine according to claim 1, characterized in that, The upper steel plate is provided with a first notch corresponding to the first clearance hole, and a first circular rubber pad is provided in the first notch.

3. The multi-layer composite shock-absorbing pad for a traction machine according to claim 2, characterized in that, The first notch is interference-fitted with the first circular rubber pad.

4. The multi-layer composite shock-absorbing pad for a traction machine according to claim 2, characterized in that, The first circular pad is an EPDM rubber pad.

5. A multi-layer composite shock-absorbing pad for a traction machine according to claim 1, characterized in that, Both the first rubber sheet and the second rubber sheet are polyurethane sheets.

6. The multi-layer composite shock-absorbing pad for a traction machine according to claim 1, characterized in that, The sleeve is a polyurethane sleeve.

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