Soft steel damper convenient to maintain

Through the assembly method of insert blocks and slots, combined with clamping fixing components and inserting fixing components, the problem of energy-consuming steel plate replacement and stability in soft steel dampers is solved, and its adaptability and stability in various environments is improved. sex.

CN222333014UActive Publication Date: 2025-01-10SHANGHAI RB RUBBER ISOLATOR TECH
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Patent Information

Application Number
CN202421162184.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-27
Publication Date
2025-01-10
Estimated Expiration
2034-05-27

AI Technical Summary

Technical Problem

The energy-consuming steel plate structure of existing mild steel dampers is fixedly installed, making it difficult to replace the material and type, and the assembly structure is unstable, which limits its application in various environments.

Method used

Using the assembly method of fitting the plug and slot, combining clamping fixing components and inserting fixing components to achieve flexible replacement and stable installation of energy-consuming steel plates, including moving slots, sliders, transmission shafts, gears and springs, etc., to ensure that Stable clamping of steel plates.

Benefits of technology

It improves the adaptability of the mild steel damper and the convenience of replacement of energy-consuming steel plates, ensures the stable installation of the steel plates, and enhances the applicability and reliability of the structure.

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Abstract

The soft steel damper convenient to maintain comprises a lower base plate and an upper base plate, an energy dissipation steel plate is distributed and installed between the lower base plate and the upper base plate, inserting blocks are fixed to the two ends of the energy dissipation steel plate, inserting grooves are formed in the opposite outer walls of the lower base plate and the upper base plate, the inserting blocks are inserted into the inserting grooves, and the inserting blocks are connected with the inserting grooves. Clamping fixing assemblies are arranged on the opposite outer walls of the lower base plate and the upper base plate, and inserting fixing assemblies are arranged on the inner walls of the two ends of the bottom of the inserting groove. The mild steel damper is applied to the prior art, the energy dissipation steel plates between the lower seat plate and the upper seat plate are assembled and installed in the mode that the insertion blocks and the insertion grooves are inserted in a matched mode, replacement and installation of the energy dissipation steel plates in the mild steel damper are facilitated, assembly of the energy dissipation steel plates made of different materials and with different thicknesses is also facilitated, and the assembly efficiency is improved. The adaptive capacity of the mild steel damper is improved, and through the arrangement of the clamping and fixing assembly, it is guaranteed that the energy dissipation steel plate in the mild steel damper is assembled stably.
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Description

Technical Field

[0001] The utility model relates to the technical field of soft steel dampers, in particular to a soft steel damper which is easy to maintain. Background Art

[0002] Mild steel dampers are usually made of low yield stress steel and are a type of energy dissipation and shock absorption device in passive structural control. During earthquakes or wind vibrations, the energy input into the structure is dissipated through the plastic yield hysteresis deformation of the mild steel, thereby achieving the purpose of shock absorption. Mild steel has good low-cycle fatigue performance and hysteresis performance. Including torsion beams, bending beams and U-shaped steel; Mild steel dampers provide additional stiffness and damping to the structure, and use the good hysteresis performance of mild steel to dissipate the input seismic energy to achieve the purpose of protecting the main structure. The soft steel damper energy-absorbing and shock-absorbing structural system can absorb shock more effectively than the traditional earthquake-resistant system, and has the advantages of simple technology, stability and reliability, and wide applicability. It is bound to become an energy-absorbing and shock-absorbing system widely used in practical engineering. Patent: CN 211202738 U discloses a soft steel damper, including an upper connecting steel plate, an energy-absorbing steel plate and a lower connecting steel plate. The two ends of the energy-absorbing steel plate are fixedly connected to the upper connecting steel plate and the lower connecting steel plate respectively. There are at least two energy-absorbing steel plates, and a concrete layer is filled between adjacent energy-absorbing steel plates. A reinforcement is fixed on the side of the energy-absorbing steel plate away from the concrete layer.

[0003] However, the structure of the soft steel damper on the market is relatively simple, and the energy-absorbing steel plate structure in the soft steel damper is mostly fixed and installed. The material and type of the energy-absorbing steel plate cannot be changed according to the needs, which is not conducive to the use of the soft steel damper in various environments. In addition, the assembly structure of the energy-absorbing steel plate in the soft steel damper does not have a variety of fastening structures, which makes it difficult to ensure the stability of the energy-absorbing steel plate assembly in the soft steel damper. Therefore, we make improvements on this and propose a soft steel damper that is easy to maintain. Utility Model Content

[0004] The purpose of the utility model is to address the problem that the energy-absorbing steel plate structure in the existing soft steel damper is mostly fixedly installed, and the material and type of the energy-absorbing steel plate cannot be replaced according to needs, which is not conducive to the use of the soft steel damper in various environments. In addition, the assembly structure of the energy-absorbing steel plate in the soft steel damper does not have a variety of fastening structures, making it difficult to ensure the stability of the assembly of the energy-absorbing steel plate in the soft steel damper.

[0005] In order to achieve the above-mentioned utility model purpose, the utility model provides the following technical solutions:

[0006] The mild steel damper is easy to maintain to improve the above problems.

[0007] The specific application is as follows:

[0008] It comprises a lower seat plate and an upper seat plate, an energy-absorbing steel plate is installed between the lower seat plate and the upper seat plate, plug-in blocks are fixed at both ends of the energy-absorbing steel plate, slots are opened on the relative outer walls of the lower seat plate and the upper seat plate, and the plug-in blocks are inserted into the inside of the slots, clamping and fixing components are arranged on the relative outer walls of the lower seat plate and the upper seat plate, and plug-in and fixing components are arranged on the inner walls at both ends of the bottom of the slots.

[0009] The top of the sliding panel also is provided with an interlocking plate, and the interlocking plate is connected with the interlocking plate by a threaded cantilever shaped like a toothed wheel, and the interlocking plate is connected with the interlocking plate by a threaded cantilever shaped like a toothed wheel.

[0010] As a preferred technical solution of the present application, the plug-in fixing component includes side grooves opened on the inner walls at the bottom of both ends of the slot, bottom grooves are opened on the inner walls at both ends of the bottom of the slot, L-shaped blocks are arranged inside the bottom grooves, connecting shafts are fixed on the outer walls at both ends of the middle part of the L-shaped blocks, and the two ends of the connecting shafts are rotatably connected to the inner walls on both sides of the bottom groove, a first spring is fixed on the inner wall at one end of the bottom of the bottom groove, and the top of the first spring is fixedly connected to the bottom of one end of the L-shaped block, and card grooves are opened on the outer walls on both sides of the plug-in block corresponding to the L-shaped blocks.

[0011] As a preferred technical solution of the present application, protrusions are fixed on the relative outer walls of the clamping plate, and grooves are provided on the outer walls on both sides of the bottom end of the energy-absorbing steel plate.

[0012] As a preferred technical solution of the present application, positioning holes are correspondingly opened on the outer walls of the bottom ends of the lower seat plate, the upper seat plate and the insert block, a screw is inserted inside the positioning hole, and nuts are threadedly connected at both ends of the screw.

[0013] As a preferred technical solution of the present application, bearings are embedded and installed at the rotational connection between the transmission shaft and the lower seat plate and the upper seat plate.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] In the scheme of this application:

[0016] 1. The soft steel damper is an application of the existing technology. The energy-absorbing steel plate between the lower seat plate and the upper seat plate is assembled and installed by means of insert blocks and slots, which facilitates the replacement and installation of the energy-absorbing steel plate in the soft steel damper, and also facilitates the assembly of energy-absorbing steel plates of different materials and thicknesses, thereby improving the adaptability of the soft steel damper;

[0017] 2. Through the setting of the clamping and fixing components, the hand wheel is rotated in the opposite direction to drive the transmission shaft to rotate, and the positive and negative threads at both ends of the transmission shaft are driven to rotate. The positive and negative threads cooperate with the screw holes respectively to drive the sliders on both sides to move in the moving groove, so that the clamping plates on both sides are unfolded. After the energy-consuming steel plate is inserted, the hand wheel is rotated clockwise to drive the sliders on both sides to move relatively in the moving groove, thereby driving the clamping plates on both sides to approach, and the clamping plates on both sides clamp the inserted energy-consuming steel plates to ensure the stable assembly of the energy-consuming steel plates in the soft steel damper. The rotation of the transmission shaft drives the gear to rotate, and under the action of the tension spring, the ratchet is driven to reset and flip, so that the ratchet is engaged in the tooth groove of the gear, so as to realize the braking of the rotation of the transmission shaft and the fixing of the clamping movement of the clamping plate, which is beneficial to the installation of the energy-consuming steel plate in the soft steel damper.

[0018] 2. Through the setting of the plug-in fixing component, before the energy-absorbing steel plate is inserted into the above-mentioned slot, the L-shaped block will be driven to reset and rotate into a V shape around the connecting axis under the action of the first spring. During the insertion process of the block in the slot, the end portion presses one end of the L-shaped block to make the L-shaped block flip around the connecting axis, so that the other end of the L-shaped block is engaged with the slots on both sides of the block, thereby realizing the positioning and fixing of the block in the slot, thereby realizing the positioning and fixing of the energy-absorbing steel plate, and ensuring the stability of the energy-absorbing steel plate in the soft steel damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the overall three-dimensional structure of the mild steel damper provided for easy maintenance in this application;

[0020] Figure 2 An enlarged view of the structure of area A in the mild steel damper that is easy to maintain for this application;

[0021] Figure 3 An enlarged view of the structure of area B in the mild steel damper that is easy to maintain for this application;

[0022] Figure 4 A schematic diagram of a three-dimensional cross-section structure of a slot in a mild steel damper that is easy to maintain and maintain for the present application;

[0023] Figure 5 An enlarged view of the structure of the C area in the mild steel damper that is easy to maintain and provide for this application.

[0024] Indicated in the figure:

[0025] 1. Lower seat plate; 2. Upper seat plate; 3. Energy-absorbing steel plate; 4. Insert block; 5. Slot; 6. Clamping and fixing assembly; 7. Insertion and fixing assembly; 8. Bump; 9. Groove; 10. Positioning hole; 11. Screw; 12. Nut;

[0026] 601, moving groove; 602, slider; 603, clamping plate; 604, transmission shaft; 605, positive thread; 606, negative thread; 607, transmission screw hole; 608, hand wheel; 609, gear; 610, rotating shaft; 611, ratchet; 612, tension spring;

[0027] 701, side groove; 702, bottom groove; 703, L-shaped block; 704, connecting shaft; 705, first spring; 706, slot. DETAILED DESCRIPTION

[0028] To make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments.

[0029] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the present invention to be protected, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present utility model, it should be noted that the terms "upper", "lower", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the present embodiment proposes a mild steel damper which is easy to maintain, comprising a lower seat plate 1 and an upper seat plate 2, an energy-absorbing steel plate 3 is distributed and installed between the lower seat plate 1 and the upper seat plate 2, plug-in blocks 4 are fixed at both ends of the energy-absorbing steel plate 3, slots 5 are distributed and opened on the relative outer walls of the lower seat plate 1 and the upper seat plate 2, and the plug-in blocks 4 are inserted into the inside of the slots 5, clamping and fixing components 6 are arranged on the relative outer walls of the lower seat plate 1 and the upper seat plate 2, and plug-in and fixing components 7 are arranged on the inner walls at both ends of the bottom of the slots 5. The mild steel damper is an application of the prior art, the energy-absorbing steel plate 3 between the lower seat plate 1 and the upper seat plate 2 is assembled and installed by means of the plug-in blocks 4 and the slots 5, which facilitates the replacement and installation of the energy-absorbing steel plate 3 in the mild steel damper, and also facilitates the assembly of energy-absorbing steel plates 3 of different materials and different thicknesses, thereby improving the adaptability of the mild steel damper.

[0034] As a preferred embodiment, on the basis of the above-mentioned method, further, the clamping and fixing component 6 includes a movable groove 601 symmetrically opened on the outer wall of the middle part of the lower seat plate 1 and the upper seat plate 2, a slider 602 is arranged inside the movable groove 601, a clamping plate 603 is fixed to the top of the slider 602, a transmission shaft 604 is rotatably connected on the inner wall of the middle part of the lower seat plate 1 and the upper seat plate 2, and the transmission shaft 604 passes through the outer walls of the movable grooves 601 at both ends and is respectively provided with positive threads 605 and negative threads 606, a transmission screw hole 607 is opened on the middle outer wall of the slider 602, and the positive threads 605 and the reverse thread 606 are respectively screwed and connected with the transmission screw holes 607 on both sides. The transmission shaft 604 passes through the lower seat plate 1 and the upper seat plate 2. One end is fixed with a hand wheel 608. The end of the transmission shaft 604 is set with a gear 609. A rotating shaft 610 is fixed on the outer wall of one side of the lower seat plate 1 and the upper seat plate 2. A ratchet 611 is rotatably installed at the end of the rotating shaft 610, and the end of the ratchet 611 is inserted into the side tooth groove of the gear 609. A tension spring 612 is connected between the end of the ratchet 611 and the seat plate. The insertion process of the energy-consuming steel plate 3 between the lower seat plate 1 and the upper seat plate 2 In the embodiment, the hand wheel 608 is rotated in the opposite direction to drive the transmission shaft 604 to rotate, and the positive threads 605 and the negative threads 606 at both ends of the transmission shaft 604 are driven to rotate. The positive threads 605 and the negative threads 606 cooperate with the transmission screw holes 607 respectively to drive the sliders 602 on both sides to move in the opposite direction in the moving grooves 601, so that the clamping plates 603 on both sides are unfolded. After the energy-consuming steel plate 3 is inserted between the lower seat plate 1 and the upper seat plate 2, the hand wheel 608 is rotated clockwise to drive the positive threads 605 and the negative threads 606 at both ends of the transmission shaft 604 to rotate, and drive the sliders 602 on both sides to move in the opposite direction. 2 moves relatively in the moving groove 601, thereby driving the clamping plates 603 on both sides to approach, and the clamping plates 603 on both sides clamp the inserted energy-consuming steel plate 3 to ensure the stable assembly of the energy-consuming steel plate 3 in the mild steel damper. During the rotation of the transmission shaft 604, the gear 609 is driven to rotate, and the ratchet 611 is driven to reset and flip under the action of the tension spring 612, so that the ratchet 611 is engaged in the tooth groove of the gear 609, so as to realize the braking of the rotation of the transmission shaft 604 and the fixing of the clamping movement of the clamping plates 603, which is beneficial to the installation of the energy-consuming steel plate 3 in the mild steel damper.

[0035] As a preferred embodiment, on the basis of the above-mentioned method, further, the insertion and fixing component 7 includes side grooves 701 provided on the inner walls at the bottom of both ends of the slot 5, bottom grooves 702 are provided on the inner walls at both ends of the bottom of the slot 5, L-shaped blocks 703 are arranged inside the bottom groove 702, connecting shafts 704 are fixed on the outer walls at both ends of the middle part of the L-shaped block 703, and the two ends of the connecting shaft 704 are rotatably connected to the inner walls at both sides of the bottom groove 702, a first spring 705 is fixed on the inner wall at one end of the bottom of the bottom groove 702, and the top of the first spring 705 is fixedly connected to the bottom of one end of the L-shaped block 703, and slots 706 are provided on the outer walls at both sides of the insertion block 4 corresponding to the L-shaped block 703. Before the energy-absorbing steel plate 3 in the above-mentioned slot 5 is inserted, the L-shaped block 703 will be driven to reset and rotate around the connecting shaft 704 under the action of the first spring 705, as shown in FIG. Figure 4 It is V-shaped, and during the insertion process of the insert block 4 in the slot 5, the end portion presses and holds one end of the L-shaped block 703, so that the L-shaped block 703 is flipped around the connecting shaft 704, and the other end of the L-shaped block 703 is engaged with the slots 706 on both sides of the insert block 4, so as to realize the positioning and fixation of the insert block 4 in the slot 5, thereby realizing the positioning and fixation of the insert block 4, and ensuring the stability of the insert block 3 in the mild steel damper.

[0036] As a preferred embodiment, on the basis of the above method, further, protrusions 8 are fixed on the relative outer walls of the clamping plate 603, and grooves 9 are opened on the outer walls on both sides of the bottom end of the energy-absorbing steel plate 3. During the clamping process of the above-mentioned clamping plate 603 on the energy-absorbing steel plate 3, the protrusions 8 on the clamping plate 603 are clamped into the grooves 9 on both sides of the energy-absorbing steel plate 3 to avoid slippage of the clamping plate 603 during the clamping process, thereby ensuring the stable assembly of the energy-absorbing steel plate 3 in the mild steel damper.

[0037] As a preferred embodiment, on the basis of the above-mentioned method, further, positioning holes 10 are correspondingly opened on the outer walls of the bottom ends of the lower seat plate 1, the upper seat plate 2 and the insert block 4, and a screw 11 is inserted inside the positioning hole 10, and nuts 12 are threadedly connected at both ends of the screw 11. After the above-mentioned energy-absorbing steel plate 3 is inserted, the positioning hole 10 on the seat plate and the positioning hole 10 on the insert block 4 are aligned, the screw 11 is inserted into the positioning hole 10, and the nuts 12 are tightened at both ends of the screw 11 to realize the insertion, positioning and fixation of the energy-absorbing steel plate 3.

[0038] As a preferred embodiment, on the basis of the above-mentioned method, further, the transmission shaft 604 and the rotation connection between the lower seat plate 1 and the upper seat plate 2 are all inlaid with bearings, and the setting of the bearings makes the transmission shaft 604 rotate more smoothly.

[0039] Specifically, when the soft steel damper with easy maintenance is working / in use: the soft steel damper is an application of the prior art, and the energy-absorbing steel plate 3 between the lower seat plate 1 and the upper seat plate 2 is assembled and installed by means of the plug-in block 4 and the slot 5, which facilitates the replacement and installation of the energy-absorbing steel plate 3 in the soft steel damper, and also facilitates the assembly of energy-absorbing steel plates 3 of different materials and thicknesses, thereby improving the adaptability of the soft steel damper. Before the energy-absorbing steel plate 3 in the slot 5 is inserted, the L-shaped block 703 is driven to rotate around the connecting shaft 704 for reset under the action of the first spring 705, such as Figure 4 The L-shaped block 703 is in a V-shape. During the insertion of the insert block 4 in the slot 5, the end thereof presses and holds one end of the L-shaped block 703, so that the L-shaped block 703 is turned around the connecting shaft 704, and the other end of the L-shaped block 703 is engaged in the card slots 706 on both sides of the insert block 4, so as to realize the positioning and fixing of the insert block 4 in the slot 5, thereby realizing the positioning and fixing of the insert block 4 in the slot 5, and ensuring the stability of the insert of the energy-consuming steel plate 3 in the mild steel damper. Before the energy-consuming steel plate 3 in the slot 5 is inserted, the L-shaped block 703 is driven to rotate around the connecting shaft 704 under the action of the first spring 705. Figure 4 It is V-shaped, and during the insertion process of the insert block 4 in the slot 5, the end portion presses and holds one end of the L-shaped block 703, so that the L-shaped block 703 is flipped around the connecting shaft 704, and the other end of the L-shaped block 703 is engaged with the slots 706 on both sides of the insert block 4, so as to realize the positioning and fixation of the insert block 4 in the slot 5, thereby realizing the positioning and fixation of the insert block 4, and ensuring the stability of the insert block 3 in the mild steel damper.

[0040] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention are included in the scope of the claims of the present invention.

Claims

1. A mild steel damper that is easy to maintain, characterized in that: The invention comprises a lower seat plate (1) and an upper seat plate (2), wherein an energy-absorbing steel plate (3) is installed between the lower seat plate (1) and the upper seat plate (2), plug-in blocks (4) are fixed at both ends of the energy-absorbing steel plate (3), slots (5) are opened on the relative outer walls of the lower seat plate (1) and the upper seat plate (2), and the plug-in blocks (4) are inserted into the inside of the slots (5), clamping and fixing components (6) are arranged on the relative outer walls of the lower seat plate (1) and the upper seat plate (2), and plug-in and fixing components (7) are arranged on the inner walls at both ends of the bottom of the slots (5).

2. A mild steel damper with easy maintenance according to claim 1, characterized in that: The clamping and fixing assembly (6) comprises a movable groove (601) symmetrically arranged on the middle outer wall of the lower seat plate (1) and the upper seat plate (2); a slider (602) is arranged inside the movable groove (601); a clamping plate (603) is fixed to the top of the slider (602); a transmission shaft (604) is rotatably connected to the middle inner wall of the lower seat plate (1) and the upper seat plate (2); the transmission shaft (604) passes through the outer wall of the movable groove (601) at both ends and is respectively provided with a positive thread (605) and a negative thread (606); a transmission screw hole (607) is arranged on the middle outer wall of the slider (602); The positive thread (605) and the negative thread (606) are respectively screwed together with the transmission screw holes (607) on both sides; the transmission shaft (604) passes through the lower seat plate (1) and the upper seat plate (2), and a hand wheel (608) is fixed at one end thereof; a gear (609) is fixedly mounted on the end of the transmission shaft (604); a rotating shaft (610) is fixed on one side outer wall of the lower seat plate (1) and the upper seat plate (2); a ratchet (611) is rotatably mounted on the end of the rotating shaft (610), and the end of the ratchet (611) is inserted into the side tooth groove of the gear (609); a tension spring (612) is connected between the end of the ratchet 611 and the seat plate.

3. A mild steel damper with easy maintenance according to claim 1, characterized in that: The plug-in fixing component (7) comprises side grooves (701) provided on the inner walls at the bottom of both ends of the slot (5); bottom grooves (702) are provided on the inner walls at both ends of the bottom of the slot (5); an L-shaped block (703) is arranged inside the bottom groove (702); connecting shafts (704) are fixed on the outer walls at both ends of the middle of the L-shaped block (703); and the two ends of the connecting shaft (704) are rotatably connected to the inner walls at both sides of the bottom groove (702); a first spring (705) is fixed on the inner wall at one end of the bottom of the bottom groove (702); and the top end of the first spring (705) is fixedly connected to the bottom of one end of the L-shaped block (703); and slots (706) are provided on the outer walls at both ends of the plug-in block (4) corresponding to the L-shaped block (703).

4. A mild steel damper with easy maintenance according to claim 2, characterized in that: The opposite outer walls of the clamping plate (603) are fixed with protrusions (8), and the outer walls on both sides of the bottom end of the energy-absorbing steel plate (3) are provided with grooves (9).

5. The maintenance-friendly mild steel damper according to claim 1, characterized in that: Positioning holes (10) are correspondingly provided on the outer walls of the bottom ends of the lower seat plate (1), the upper seat plate (2) and the insert block (4), a screw rod (11) is inserted into the interior of the positioning hole (10), and nuts (12) are threadedly connected at both ends of the screw rod (11).

6. A mild steel damper with easy maintenance according to claim 2, characterized in that: The transmission shaft (604) and the rotational connection between the lower seat plate (1) and the upper seat plate (2) are all inlaid with bearings.

Citation Information

Patent Citations

  • Soft steel damper

    CN211202738U