A non-continuous friction damper and method of use thereof

Abstract

The application discloses a kind of discontinuous friction damper and its use method, belong to friction damper technical field, including damper pull rod, pull rod groove, limit hole, damper shell, damper cover, pin hole, connecting piece, fixed bolt, compression bolt, disc spring, guide bolt, pressure block, friction block, friction damper provided by the application can withstand large stroke and large tonnage, when tower crane faces sudden unloading working condition, damper initial operation provides damping force, buffer arm frame upwarp impact force, cancel damping force after a certain stroke, facilitate arm frame upwarp fast drop balance arm tail balance weight, after balance weight drop is completed, friction damper provides damping force, for arm frame continues to overturn under the action of inertia force provides certain resistance, to reduce arm frame upwarp displacement, prevent arm frame under the action of inertia force overturn from thereby causing arm frame drop dangerous.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of non-continuous friction damper and its use method, belong to the technical field of friction damper. BACKGROUND

[0002] The conventional friction damper of existing application is suitable for civil construction industry, and multiple friction dampers are used to reduce vibration, consume energy and resist earthquake. The sliding friction force provided by the conventional friction damper is usually a fixed value, and the structure of the friction damper cannot adjust the damping force. In the field of engineering machinery, the damping force of the damper needs to be adjusted conveniently and maintained easily. The friction damper is used in the tower crane industry. When the tower crane faces sudden unloading conditions, the boom will be tilted upward and the balance weight at the tail of the balance arm will be detached. The friction damper needs to provide damping force at the initial stage of the tilting of the boom to buffer the impact force. When the boom is tilted to a certain angle, the friction damper needs to provide no damping force to facilitate the tilting of the boom and the detachment of the balance weight. When the balance weight is detached, the boom will continue to tilt upward under the action of inertia force. At this time, the friction damper needs to be involved to provide damping force to provide resistance to the continued tilting of the boom under the action of inertia force, thereby reducing the tilting displacement of the boom. At this time, the friction damper needs to provide damping force intermittently, and the continuous friction damper cannot meet the use conditions. SUMMARY

[0003] The present application aims to overcome the deficiencies in the prior art and provide a non-continuous friction damper and its use method. The friction damper can withstand large displacement and large tonnage. When the tower crane faces sudden unloading conditions, the damper provides damping force at the initial stage of operation to buffer the impact force of the tilting of the boom. After a certain displacement, the damping force is cancelled to facilitate the rapid tilting and detachment of the balance weight at the tail of the balance arm. After the detachment of the balance weight is completed, the friction damper provides damping force to provide resistance to the continued tilting of the boom under the action of inertia force, thereby reducing the tilting displacement of the boom and preventing the boom from tilting excessively under the action of inertia force to cause the danger of detachment of the boom.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] In the first aspect, the present application provides a non-continuous friction damper, comprising:

[0006] A damper shell is provided with an insertion slot at one end, and a pin hole is formed on the side surface of the damper shell.

[0007] A damper pull rod is inserted into the insertion slot of the damper shell, and a limiting hole is formed at one end of the damper pull rod.

[0008] A connecting piece is installed in the pin hole and passes through the limiting hole on the damper pull rod.

[0009] A damper sleeve is installed outside the damper shell, a threaded hole is formed on the damper sleeve, a pressing mechanism is installed in the threaded hole, and the pressing mechanism presses the damper pull rod through the through hole formed in the side of the damper shell in advance;

[0010] A pull rod groove is formed on the surface of the damper pull rod and is used in cooperation with the pressing mechanism. When the pull rod groove moves to the position of the pressing mechanism, the pressing mechanism falls into the pull rod groove, and the pressing mechanism is not in contact with the damper pull rod.

[0011] Further, the pressing mechanism includes a pressing bolt, a disc spring, a pressing block, and a pressing friction block. The pressing bolt transmits force to the pressing block through the disc spring, the pressing block presses the friction block, and the friction block presses the damper pull rod through the through hole under the pressing of the pressing block.

[0012] Further, a threaded hole is formed on the upper part of the pressing block, and a guide bolt is installed in the threaded hole. The guide bolt passes through the center hole of the disc spring and is used for guiding the disc spring.

[0013] Further, two groups of pressing bolts, disc springs, and guide bolts are respectively arranged on the upper part of the pressing block.

[0014] Further, the pressing mechanism is provided with two groups, and the two groups of pressing mechanisms are respectively located at the two ends of the damper sleeve.

[0015] Further, the connecting piece includes a pin shaft and a round nut. The pin shaft passes through the pin shaft hole and is fastened by the round nut.

[0016] Further, the connecting piece further includes a stop washer. The stop washer is arranged on the side where the pin shaft, the round nut, and the damper shell are in contact.

[0017] Further, the damper sleeve is fixed to the damper shell by a fixing bolt.

[0018] Further, the edge of the pull rod groove is an arc-shaped transition smooth structure.

[0019] Further, one end of the damper pull rod located outside the damper shell and the end of the damper shell away from the damper pull rod are respectively provided with a fixing ring for connecting with the arm support.

[0020] In a second aspect, the application provides a use method of the discontinuous friction damper according to any one of the preceding aspects, comprising:

[0021] The damper pull rod is stretched. When the pull rod groove moves to the position of the friction block, the upper friction block falls into the pull rod groove, the lower friction block is not in contact with the damper pull rod, the pre-tightening force of the upper pressing bolt cannot act on the friction block, the lower friction block is not in contact, and at this time, the friction damper does not exist damping force.

[0022] Continue to stretch the damper pull rod, the friction block passes the pull rod groove, at this time the upper and lower two sides friction blocks are in contact with the damper pull rod, under the action of the pre-tightening force of the compression bolt, the damper restores the friction force.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] 1. The present application provides a non-continuous friction damper and its use method, which realizes the damper without friction force by increasing the groove of the damper pull rod, meets the demand of various working conditions, and realizes the state of the friction damper damping force from having to none to having with the change of stroke.

[0025] 2. The present application provides a non-continuous friction damper and its use method, which can bear large stroke and large tonnage, when the tower crane faces sudden unloading working condition, the damper initial operation provides damping force, buffers the impact force of the boom upwarping, cancels the damping force after a certain stroke, facilitates the boom upwarping to quickly drop the balance weight at the tail of the balance arm, after the balance weight drops, the friction damper provides damping force, provides certain resistance for the boom to continue to overturn under the action of the inertial force, thereby reducing the boom upwarping displacement, preventing the boom from over-turning under the action of the inertial force and thereby causing the danger of the boom falling off. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structure schematic view of a non-continuous friction damper provided by the embodiment of the present application;

[0027] Figure 2 is a damper limiting schematic view provided by the embodiment of the present application;

[0028] Figure 3 is a damper initial operation state schematic view provided by the embodiment of the present application;

[0029] Figure 4 is a damper without damping force state schematic view provided by the embodiment of the present application;

[0030] Figure 5 is a damper again existing damping force state schematic view provided by the embodiment of the present application.

[0031] 1, damper pull rod; 1a, pull rod groove; 1b, limiting hole; 2, damper sleeve; 3, damper shell; 3a, pin hole; 4, connecting piece; 5, fixed bolt; 6, compression bolt; 7, disc spring; 8, guide bolt; 9, pressing block; 10, friction block. DETAILED DESCRIPTION

[0032] 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 should not be used to limit the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Example 1

[0036] like Figure 1 As shown, this embodiment introduces a discontinuous friction damper, including a damper rod 1, a rod groove 1a, a limiting hole 1b, a damper shell 3, a damper sleeve 2, a pin hole 3a, a connector 4, a fixing bolt 5, a clamping bolt 6, a disc spring 7, a guide bolt 8, a pressure block 9, and a friction block 10.

[0037] The damper pull rod 1 is installed inside the damper shell 3, the damper sleeve 2 is installed outside the damper shell 3, the damper sleeve 2 and the damper shell 3 are fixed by the fixing bolt 5, one end of the damper pull rod 1 is located outside the damper shell 3, and the other end of the damper shell 3 away from the damper pull rod 1 is provided with a fixing ring for connecting with the boom, the upper and lower cover plates of the damper sleeve 2 are provided with threaded holes for facilitating the installation of the compression bolt 6, the pre-tightening force of the compression bolt 6 is transmitted to the pressing block 9 through the disc spring 7, the disc spring 7 can prevent the compression bolt 6 from loosening by deformation, the pressing block 9 presses the friction block 10, the upper part of the pressing block 9 is provided with a threaded hole, and the guide bolt 8 is installed in the threaded hole for guiding the disc spring 7 and preventing the disc spring 7 from sliding in the damper, at this time, the friction block 10 presses the damper pull rod 1, and the damper pull rod 1 generates friction force with the friction block 10 when being stretched.

[0038] A pin shaft hole 3a is processed on the side of the damper shell 3, one end of the damper pull rod 1 is provided with a limiting hole 1b, the connecting piece 4 is installed in the pin shaft hole 3a and passes through the limiting hole 1b on the damper pull rod 1, and the connecting piece 4 comprises a pin shaft, a stop washer and a round nut. The pin shaft passes through the pin shaft hole and is fastened by the round nut, the stop washer is arranged on the side of the pin shaft and the round nut in contact with the damper shell 3, and when the connecting piece 4 contacts the left circular arc surface of the limiting hole 1b during the stretching process of the damper pull rod 1, the damper pull rod 1 is limited to continue to be pulled out by the pin shaft, as shown in Figure 2 .

[0039] A pull rod groove 1a is processed on the upper and lower sides of the damper pull rod 1, when the pull rod groove 1a moves to the position of the friction block 10 during the stretching process of the damper pull rod 1, the upper friction block 10 falls into the pull rod groove 1a, the edge of the pull rod groove 1a is an arc-shaped transition smooth structure, the lower friction block 10 does not contact the damper pull rod 1, the pre-tightening force of the upper compression bolt 6 cannot act on the friction block 10, and the lower friction block 10 does not contact, at this time, the friction damper does not exist damping force. With the continuous stretching of the damper pull rod 1, the friction block 10 passes through the pull rod groove 1a, at this time, the upper and lower friction blocks 10 are in contact with the damper pull rod 1, under the action of the pre-tightening force of the compression bolt 6, the damper restores the friction force, and the running state is as shown in Figures 3-5 .

[0040] Embodiment 2

[0041] As shown in Figure 3 , two groups of compression bolts 6, disc springs 7 and guide bolts 8 are respectively arranged on the pressing block 9 of the embodiment, and the remaining components are the same as those of embodiment 1.

[0042] By setting two groups of pressing bolts 6, disc springs 7 and guide bolts 8, the pressing force is improved, so that the damping force is improved to provide certain resistance for the arm support to continue to overturn under the action of inertia force, thereby reducing the upward displacement of the arm support, preventing the arm support from over-tilting under the action of inertia force and thereby causing the danger of falling off the arm support.

[0043] Embodiment 3

[0044] As shown in Figure 3 The pressing mechanism of the present embodiment is provided with two groups, and the two groups of pressing mechanisms are respectively located at both ends of the damper sleeve 2, and the remaining parts are the same as those of embodiment 2.

[0045] By setting two groups of pressing mechanisms, the damping force is further improved to provide certain resistance for the arm support to continue to overturn under the action of inertia force, thereby reducing the upward displacement of the arm support, preventing the arm support from over-tilting under the action of inertia force and thereby causing the danger of falling off the arm support.

[0046] Embodiment 4

[0047] The present embodiment provides a use method of the discontinuous friction damper according to any one of embodiments 1-3, comprising:

[0048] When the tension damper pull rod 1 is pulled, the upper friction block 10 will fall into the pull rod groove 1a, and the lower friction block 10 will not be in contact with the damper pull rod 1, the pre-tightening force of the upper pressing bolt 6 cannot act on the friction block 10, and the lower friction block 10 is not in contact, at this time the friction damper does not exist damping force;

[0049] Continue to pull the damper pull rod 1, the friction block 10 passes through the pull rod groove 1a, at this time the upper and lower friction blocks 10 are in contact with the damper pull rod 1, under the action of the pre-tightening force of the pressing bolt 6, the damper restores the friction force.

[0050] The above only describes the preferred embodiments of the present application, and it should be noted that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. A non-continuous friction damper, characterized by, It includes: Damper shell (3), the damper shell (3) is provided with an insertion slot at one end, and the damper shell (3) is provided with a pin hole (3a) on the side; Damper pull rod (1), the damper pull rod (1) is inserted into the insertion slot of the damper shell (3), and the damper pull rod (1) is provided with a limiting hole (1b) at one end; Connecting piece (4), the connecting piece (4) is installed in the pin hole (3a) and passes through the limiting hole (1b) on the damper pull rod (1); Damper sleeve (2), the damper sleeve (2) is installed outside the damper shell (3), the damper sleeve (2) is provided with a threaded hole, the threaded hole is provided with a pressing mechanism, the pressing mechanism passes through the through hole on the side of the damper shell (3) and presses the damper pull rod (1); Pull rod groove (1a), the pull rod groove (1a) is provided on the surface of the damper pull rod (1) and is used in cooperation with the pressing mechanism, when the pull rod groove (1a) moves to the position of the pressing mechanism, the pressing mechanism falls into the pull rod groove (1a), and the pressing mechanism is not in contact with the damper pull rod (1).

2. The discontinuous frictional damper of claim 1, wherein, The pressing mechanism includes a pressing bolt (6), a disc spring (7), a pressing block (9) and a pressing friction block (10), the pressing bolt (6) transmits force to the pressing block (9) through the disc spring (7), the pressing block (9) presses the pressing friction block (10), and the pressing friction block (10) presses the damper pull rod (1) through the through hole under the pressing of the pressing block (9).

3. The discontinuous frictional damper of claim 2, wherein, Threaded holes are formed in the upper part of the pressing block (9), and guide bolts (8) are installed in the threaded holes, the guide bolts (8) pass through the center holes of the disc springs (7) and are used for guiding the disc springs (7).

4. The discontinuous frictional damper of claim 3, wherein, The pressing block (9) is respectively provided with two groups of pressing bolts (6), disc springs (7) and guide bolts (8).

5. The discontinuous frictional damper of claim 1, wherein, The pressing mechanism is provided with two groups, and the two groups of pressing mechanisms are respectively located at two ends of the damper sleeve (2).

6. The discontinuous frictional damper of claim 1, wherein, The connecting piece (4) includes a pin and a round nut, the pin passes through the pin hole (3a) and is fastened by the round nut.

7. The discontinuous frictional damper of claim 6, wherein, The connecting piece (4) further includes a stop washer, which is arranged on the side where the pin, the round nut and the damper shell (3) are in contact.

8. The discontinuous frictional damper of claim 1, wherein, The edge of the pull rod groove (1a) is an arc-shaped transition smooth structure.

9. The discontinuous frictional damper of claim 1, wherein, The damper pull rod (1) is located at one end outside the damper shell (3), and the damper shell (3) is provided with a fixing ring at the end away from the damper pull rod (1) for connecting with the arm support.

10. A method of using a discontinuous friction damper according to any one of claims 1-9, characterized in that, It includes: Stretching the damper pull rod (1), when the pull rod groove (1a) moves to the position of the friction block (10), the upper friction block (10) will fall into the pull rod groove (1a), the lower friction block (10) will not be in contact with the damper pull rod (1), the pre-tightening force of the upper pressing bolt (6) cannot act on the friction block (10), the lower friction block (10) is not in contact, and at this time the friction damper does not exist damping force; Continue to stretch the damper pull rod (1), the friction block (10) passes through the pull rod groove (1a), at this time the upper and lower friction blocks (10) are in contact with the damper pull rod (1), under the action of the pre-tightening force of the pressing bolt (6), the damper restores the friction force.

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