Friction damper for mortise and tenon joint of ancient wooden framework

Abstract

The invention relates to the technical field of civil engineering components, in particular to an ancient building wood framework mortise and tenon joint friction damper which comprises a wood column and a wood beam connected to the wood column in a mortise and tenon mode and further comprises a supporting part installed between the wood column and the wood beam. The whole supporting part can be arranged on the upper side or the lower side of a wood beam joint. Wherein the supporting part is used for providing support under the condition that the wood beam generates small deformation relative to the wood column at a corner; under the condition of large deformation, vibration reduction is provided; through the arrangement of the supporting part, the supporting part can achieve the supporting effect under small and medium earthquakes, and the node rigidity and strength are improved; energy dissipation and vibration reduction are achieved under the action of a large earthquake, the earthquake response of structures such as wood beams and wood columns is reduced, tenon-and-mortise joints are protected, and the service life of the tenon-and-mortise joints is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering components, and in particular to a friction damper for mortise and tenon joints of an ancient wooden building frame. Background Art

[0002] Mortise and tenon joints are important connecting parts of beams and columns in ancient wooden structures. In order to maintain their original appearance and not disturb the original joints excessively, energy dissipation and vibration reduction devices are usually used as supporting components of the building structure.

[0003] Currently, the energy dissipation and vibration reduction device fails to provide a certain load-bearing capacity under small vibrations, that is, fails to play the role of a beam pad, so that the device cannot take into account both the load-bearing capacity under small vibrations and the vibration reduction under large vibrations.

[0004] For example, the existing application number CN201510698578.3 discloses a friction damper for the mortise and tenon joints of an ancient wooden structure. The friction energy-dissipating damper uses steel plates connected between beams and columns to dissipate energy by friction between the steel plates at the bearings. However, the connection between the steel plate of the energy dissipation device and the beam-column is a fixed edge constraint, and it is difficult to generate corresponding rotation when the beam-column undergoes angular displacement. Summary of the invention

[0005] The present invention provides a friction damper for the mortise and tenon joints of an ancient wooden frame, which can achieve a supporting effect under small and medium earthquakes, improve the stiffness and strength of the joints, and achieve energy dissipation and vibration reduction under large earthquakes. The specific scheme is as follows: A friction damper for mortise and tenon joints of an ancient wooden frame, comprising a wooden column and a wooden beam connected to the wooden column by mortise and tenon joints, and also comprising a support portion installed between the wooden column and the wooden beam; the support portion as a whole can be placed on the upper side or the lower side of the wooden beam node; wherein the support portion is used to: provide support when the wooden beam has a small deformation condition relative to the wooden column at a corner; and provide vibration reduction under a large deformation condition.

[0006] Furthermore, the supporting part specifically includes a slide rail, a slider and a diagonal support rod; the slide rail is installed on the length side of the wooden beam; the slider is slidably installed in the slide rail; the diagonal support rod is hinged on the wooden column, and the other end is hinged to the slider; wherein, friction energy-absorbing material is installed on at least one wall portion where the slide rail contacts the slider to increase the resistance of the slider during sliding.

[0007] Furthermore, the slide rail is composed of two inclined wall portions, which together form a dovetail-shaped slide groove; the surface of the slider located in the slide groove of the slide rail is in contact with the two wall portions.

[0008] Furthermore, at least one of the sliding rail walls is penetrated by an installation groove; a support beam is installed in the installation groove; a rotating rod located above the support beam is also installed in the installation groove; a transmission belt whose outer surface is always in contact with the surface of the slider is tightly sleeved between the rotating rod and the support beam; and the friction energy-absorbing material is adhered to the outer surface of the transmission belt.

[0009] Furthermore, a motor is installed on the slide rail; one end of the rotating rod extends to the outside of the slide rail, and the extended end is connected to the output shaft of the motor through a pulley assembly.

[0010] Furthermore, the surface of the rotating rod is circumferentially distributed with a plurality of driving teeth; the inner surface of the transmission belt is also equipped with transmission teeth meshing with the driving teeth; and the support beam is also provided with an avoidance groove for accommodating the transmission teeth.

[0011] Furthermore, a brush rod is installed on the slide rail; the bristle portion of the brush rod is always in contact with the outer surface of the transmission belt.

[0012] Furthermore, a cylinder is installed on the slide rail; the rod portion of the brush rod is sealingly and slidably connected to the cylinder; a reciprocating screw is also installed on the extended end of the rotating rod; a moving block is sleeved on the reciprocating screw; and the bottom end of the moving block is fixedly connected to the rod portion of the brush rod.

[0013] Furthermore, a piston block is installed on the rod portion of the brush rod located inside the cylinder; the side surface of the piston block is slidably fitted with the inner wall of the cylinder; both ends of the cylinder are connected to an air inlet pipe with a one-way valve; both sides of the piston block are provided with an air outlet pipe with a one-way valve, the brush rod is hollow inside, and the air outlet pipe is connected to the brush rod; the brush rod is provided with a plurality of air inflation ports facing the bristle part.

[0014] Furthermore, a shell is installed at the bottom end of the wooden beam, and the shell is entirely wrapped around the outside of the support part.

[0015] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: The device is provided with a supporting part, which can realize a supporting function under small and medium earthquakes and improve the stiffness and strength of the node; it can realize energy dissipation and vibration reduction under the action of a large earthquake, reduce the seismic response of the wooden beams, wooden columns and other structures themselves, protect the mortise and tenon joints, and increase their service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them: Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic structural diagram of the support portion of the present invention.

[0018] Figure 3 It is a schematic diagram of the bearing structure of the support part of the present invention.

[0019] Figure 4 It is a schematic diagram of the right side structure of the support part of the present invention.

[0020] Figure 5 It is a schematic diagram of the rear view structure of the support part of the present invention.

[0021] Figure 6 It is a schematic structural diagram of the support beam of the present invention.

[0022] Figure 7 It is a schematic diagram of the meshing structure of the driving teeth and the transmission teeth of the present invention.

[0023] Figure 8 It is a schematic structural diagram of the reciprocating screw rod of the present invention.

[0024] Fig. 9 It is a schematic structural diagram of the air blowing port described in the present invention.

[0025] Fig.10 It is a schematic diagram of the internal structure of the cylinder described in the present invention.

[0026] Fig.11 It is a schematic diagram of the cross-sectional structure of the brush rod of the present invention.

[0027] The reference numerals are as follows: 01. Wooden column; 02. Wooden beam; 10. Support part; 11. Slide rail; 12. Slider; 13. Diagonal brace; 20. Mounting slot; 21. Support beam; 22. Transmission belt; 23. Rotating rod; 30. Motor; 31. Driving gear; 32. Transmission gear; 33. Avoidance groove; 40. Brush rod; 41. Cylinder; 42. Reciprocating screw rod; 43. Moving block; 44. Piston block; 45. Air inlet pipe; 46. Air outlet pipe; 47. Air blowing port; 50. Shell. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] Example: Please refer to Figure 1 to Figure 3 As shown, the present invention provides a friction damper for the mortise and tenon joints of an ancient building wooden frame, comprising a wooden column 01 and a wooden beam 02 connected to the wooden column 01 by mortise and tenon joints; further comprising a support portion 10, installed between the wooden column 01 and the wooden beam 02; the support portion 10 can be placed on the upper side or the lower side of the node of the wooden beam 02 as a whole according to the application scenario; wherein the support portion 10 is used to: provide support when the wooden beam 02 has a small deformation condition relative to the wooden column 01 at a corner; and provide vibration reduction under a large deformation condition; the above deformation condition is mainly caused by factors such as earthquakes, that is, the angle between the wooden column 01 and the wooden beam 02 undergoes a reciprocating change / deformation under the action of an earthquake.

[0030] When in use: the support part 10 can achieve support under small and medium earthquakes, improve the stiffness and strength of the node, achieve energy dissipation and vibration reduction under large earthquakes, reduce the seismic response of the structures such as wooden beams 02 and wooden columns 01 themselves, protect the mortise and tenon joints, and increase their service life.

[0031] Reference Figure 2 , Figure 3 and Figure 4 As shown, specifically, the present application is illustrated with the support part 10 being located at the lower side of the wooden beam 02, and the support part 10 specifically includes a slide rail 11, a slider 12 and a diagonal brace 13; the slide rail 11 is installed on the length edge of the bottom end of the wooden beam 02 through a square clamp; the slider 12 is slidably installed in the slide rail 11, and the slider 12 can be selected from a wood material with a rough surface, or a metal material and a friction material (friction particles, similar to a brake pad) is attached to the side in contact with the friction material; the diagonal brace 13 is hinged to the wooden column 01 through a circular clamp, and the other end of the diagonal brace 13 is hinged to the slider 12; wherein, a friction energy-absorbing material, such as the friction material on the brake pad of an automobile, is installed on at least one wall portion where the slide rail 11 contacts the slider 12, so as to increase the resistance of the slider 12 during sliding; When in use: Under factors such as earthquakes, there are generally two situations: small and medium earthquakes and large earthquakes. Both situations will cause different degrees of rotational displacement at the nodes of wooden column 01 and wooden beam 02, among which: When the horizontal force generated by the small earthquake is smaller than the friction force between the slide rail 11 and the slider 12, the slider 12 is difficult to slide linearly in the slide rail 11, and the diagonal brace 13 will not change position. At this time, the diagonal brace 13 plays the role of beam pad to provide support for the wooden beam 02, thereby increasing the stiffness and strength of the node. When the horizontal force generated by a large earthquake is greater than the friction between the slide rail 11 and the slider 12, the slider 12 breaks through the friction and slides in the slide rail 11, and energy dissipation and vibration reduction are achieved through the friction between the slider 12 and the friction material, so as to dissipate energy as quickly as possible and reduce the seismic response of the wooden structure of the ancient building; In summary, during an earthquake, different degrees of rotational displacement will be formed at the nodes of the wooden column 01 and the wooden beam 02. For example, under small and medium earthquakes, the diagonal brace rod 13 can be used as a beam pad to support and improve the stiffness and strength of the node. Under a large earthquake, the friction work of the wooden slider 12 can achieve energy dissipation and vibration reduction.

[0032] Reference Figure 4 As shown, the slide rail 11 is composed of two inclined walls, which together form a dovetail-shaped slide groove, that is, a dovetail slide groove; the surface of the slider 12 located in the slide groove of the slide rail 11 fits with the two walls, that is, the slider 12 is also dovetail-shaped; During use: the setting of the dovetail-shaped slider 12 can form an anti-falling effect with the slide rail 11, and can increase the contact area between it and the inner wall of the slide rail 11. Similarly, increasing the area between it and the friction material on the wall of the slide rail 11 can make the slider 12 fully contact with the friction material on the wall of the slide rail 11, ensuring that when vibration is generated, the friction force can be used to support or dissipate energy and reduce vibration.

[0033] Reference Figure 5 , Figure 6 and Figure 7 As shown, at least one of the walls of the slide rail 11 is penetrated with an installation groove 20; a support beam 21 is installed in the installation groove 20, one end of the support beam 21 is fixedly connected to the slide rail 11, and the other end can be supported and blocked by a plug slidably connected to the slide rail 11 (such as Figure 6 As shown, a rotating rod 23 located above the support beam 21 is also installed in the installation groove 20; a transmission belt 22 whose outer surface is always in contact with the surface of the slider 12 is also tightly sleeved between the rotating rod 23 and the support beam 21 (the back of the transmission belt 22 is always in contact with the surface of the support beam 21); the friction energy dissipation material can be evenly adhered to the outer surface of the transmission belt 22 by an adhesive; During use: During an earthquake, the slider 12 and the friction material on the inner wall of the slide rail 11 will produce fine particles (debris when the slider 12 is made of wood, and friction particles when the slider 12 is made of metal and has a granular friction surface). These detached fine particles will reduce the friction between the slider 12 and the friction material, and the performance of the friction material will also be weakened. After the earthquake is over and during operation and maintenance, the entire device needs to be disassembled and the friction material on the inner wall of the slide rail 11 needs to be cleaned or replaced, which is time-consuming and labor-intensive. To this end, in the present application, the friction material is adhered to the transmission belt 22. During later operation and maintenance, the transmission belt 22 can be rotated to adjust the friction material at different positions (clean places) thereon to contact with the slider 12. There is no need to disassemble and replace the friction material, which is efficient and quick. Replacing and adjusting the friction material at different positions on the transmission belt 22 to contact with the slider 12 can ensure that when the subsequent beam-column node rotates and displaces again, the slider 12 can have better friction with the friction material on the wall of the slide rail 11, thereby ensuring the recycling performance of the entire device.

[0034] Reference Figure 8 As shown, a motor 30 is also installed on the slide rail 11; one end of the rotating rod 23 extends to the outside of the slide rail 11, and the extended end is connected to the output shaft of the motor 30 through a pulley assembly; When in use: Based on the above adjustment of the contact between the friction material at different positions on the transmission belt 22 and the slider 12, further improvements are: As is known to all, there are multiple ancient wooden building structures in the same area, and each building structure is equipped with at least one energy dissipation device of the present application. If the contact position between the slider 12 and the unused friction material surface on the transmission belt 22 is adjusted one by one, it is time-consuming and laborious; To this end, in the present application, by setting up a motor 30, when it is necessary to adjust the position of the friction material on the transmission belt 22, the motor 30 can be started, and the output shaft of the motor 30 drives the rotating rod 23 to rotate, thereby adjusting the position of the transmission belt 22 tightly fitted on the support beam 21 and the rotating rod 23, thereby adjusting the position of the friction material on the transmission belt 22, without having to go to the building site for adjustment, and the operation is simple, efficient and fast.

[0035] Reference Figure 8 and Figure 7 As shown, the surface of the rotating rod 23 is also circumferentially distributed with a plurality of driving teeth 31; the inner surface of the transmission belt 22 is also equipped with a transmission tooth 32 meshing with the driving tooth 31; and the support beam 21 is also provided with an avoidance groove 33 of uniform depth and accommodating the transmission tooth 32; When in use: since the slider 12 is in close contact with the friction material on the transmission belt 22 and there is a certain friction force, the transmission belt 22 and the rotating rod 23 may slip by rotating the rotating rod 23; To this end, when the rotating rod 23 rotates, the driving teeth 31 provided by itself can mesh with the transmission teeth 32 on the transmission belt 22, so as to force the transmission belt 22 to overcome the friction between the driving belt 22 and the slider 12 and form a transmission adjustment; and the support beam 21 is also provided with an avoidance groove 33 to ensure that the transmission teeth 32 on the inner surface of the transmission belt 22 can be avoided during the transmission adjustment process of the transmission belt 22, while the remaining inner surface of the transmission belt 22 except the transmission teeth 32 is still attached to the outer surface of the support beam 21. Under the premise of not affecting the transmission adjustment of the transmission belt 22, the support beam 21 can always support the transmission belt 22, so that the outer surface of the transmission belt 22 (friction material) is always in close contact with the surface of the slider 12.

[0036] Reference Figure 8 and Fig. 9 As shown, a brush rod 40 is also installed on the slide rail 11; the bristle portion of the brush rod 40 is always in contact with the outer surface of the transmission belt 22; When in use: on the basis of transmission by the transmission belt 22, the bristle part of the brush rod 40 can also wipe and clean the surface of the transmission belt 22 during the action process, so as to remove the fine particles of impurities attached to the contact surface of the transmission belt 22 (friction surface / friction material) after the friction with the slider 12, so as to ensure that the friction surface of the transmission belt 22 wiped by the brush rod 40 is relatively clean. For this reason, the transmission belt 22 and the friction material attached thereto have the ability to be recycled, and the friction material at different positions thereon can be adjusted to contact with the slider 12, and the position of the friction material can also be cleaned, so there is no need to disassemble and replace and clean the surface after each earthquake, which saves manpower; It is worth noting that the brush rod 40 in the present application is not only used for cleaning and maintaining the transmission belt 22 or the friction material thereon after an earthquake; the motor 30 can also be equipped with an external vibration sensor for use during an earthquake (not shown in the figure, it is a well-known technology and will not be described in detail), so that during an earthquake, the motor 30 can be automatically started under the action of the vibration sensor, thereby controlling the transmission belt 22 to have a continuous transmission adjustment effect, and ensuring that the friction material on the surface of the transmission belt 22 can always cooperate with the brush rod 40 to achieve self-cleaning. In this dynamic cleaning process, the friction surface on the transmission belt 22 in contact with the slider 12 is always in a relatively clean state, thereby ensuring that the friction material on the slider 12 and the transmission belt 22 always maintains a better friction energy dissipation capacity; At the same time, the continuous contact between the slider 12 and the friction material on the surface of the transmission belt 22 will generate friction heat, which will reduce the friction coefficient between the slider 12 and the friction material to a certain extent, resulting in a decline in friction capacity. The transmission belt 22 can form a cyclic conveying capability, so that the slider 12 can contact the friction material at different positions on the transmission belt 22. Compared with always contacting the friction material in the same area, changing the contact at different positions can reduce heat generation and superposition, ensuring that the friction material on the surface of the transmission belt 22 and the slider 12 always maintain a better friction energy dissipation capacity; In other words, by giving the transmission belt 22 that contacts the slider 12 the ability to change its position, the friction surface in contact with the slider 12 is always relatively clean, and the heat caused by repeated contact between the slider 12 and the same friction material area can be reduced, thereby ensuring the friction energy dissipation effect between the slider 12 and the friction material; at the same time, during the process of changing the position of the friction material on the transmission belt 22, self-cleaning can be achieved in conjunction with the brush rod 40, so that the friction surface on the transmission belt 22 is always relatively clean, and the friction material in different positions can be "replaced" during an earthquake, thereby ensuring the energy dissipation and vibration reduction effect of the overall structure and improving the service life of the wooden structure of the ancient building.

[0037] Reference Figure 8 and Fig.10As shown, a cylindrical barrel 41 is also installed on the slide rail 11; the rod portion of the brush rod 40 is slidably connected to the barrel 41 through a linear sealed bearing; a reciprocating screw 42 is also installed at the extended end of the rotating rod 23, and a moving block 43 matching with the reciprocating screw 42 is sleeved on the reciprocating screw 42. Under the premise of not changing the rotation direction of the reciprocating screw 42, the moving block 43 can be driven to reciprocate along the length direction of the rod by the rotation of the reciprocating screw 42, and the bottom end of the moving block 43 is fixedly connected to the rod portion of the brush rod 40; During use: During an earthquake, when the motor 30 drives the rotating rod 23 to rotate normally, the rotating rod 23 can drive the reciprocating screw rod 42 to rotate synchronously, and the reciprocating screw rod 42 can drive the movable block 43 connected thereto to move back and forth. During the process, the movable block 43 can drive the fixed brush rod 40 to move back and forth; that is, when the rotating rod 23 drives the transmission belt 22 to transmit and adjust and replace the position of the friction material, the brush rod 40 can also move back and forth, thereby reciprocatingly wiping the friction surface of the transmission belt 22, thereby improving the effect of the brush rod 40 wiping and cleaning the surface of the transmission belt 22.

[0038] Reference Fig.10 and Fig.11 As shown, a piston block 44 is also installed on the rod portion of the brush rod 40 located in the cylinder 41; the side of the piston block 44 is slidably fitted with the inner wall of the cylinder 41; the bottoms of both ends of the cylinder 41 are connected to an air inlet pipe 45 with a one-way valve, so that the external air flow can only be introduced into the cylinder 41 through the air inlet pipe 45; both sides of the piston block 44 are provided with an air outlet pipe 46 with a one-way valve, so that the air flow can only be discharged through the air outlet pipe 46, and the brush rod 40 is hollow inside, and the air outlet pipe 46 is connected to the brush rod 40; the brush rod 40 is provided with a plurality of air blowing ports 47 facing the bristle part; When in use: on the basis of the reciprocating transverse movement of the brush rod 40, the brush rod 40 can also drive the piston block 44 to reciprocate in the cylinder 41, so that the external airflow can be drawn in from the air inlet pipe 45 with a one-way valve, and introduced into the inside of the brush rod 40 from the air outlet pipe 46 with a one-way valve, and then discharged from the air blowing port 47, so as to blow and clean the bristle part of the brush rod 40, ensure the cleanliness of the bristle part, and improve the cleaning effect of the friction surface of the transmission belt 22; At the same time, the continuous contact between the slider 12 and the friction material on the surface of the transmission belt 22 will generate friction heat, which will reduce the friction coefficient between the slider 12 and the friction material to a certain extent, resulting in a decline in friction capacity. The blowing action not only acts on the cleaning of the bristle part, but also reflects the blowing and cooling of the friction material on the surface of the transmission belt 22 in a continuous transmission state, relieving the temperature of the friction material after the friction contact process of the slider 12, ensuring that the friction material on the surface of the transmission belt 22 that has been cleaned and cooled has better friction when it contacts the slider 12 again, and stabilizing the friction energy dissipation capacity between the structures; The difference is that, Fig.11As shown, the piston block 44 divides the closed cylinder 41 into two air chambers, left and right. When the piston block 44 moves from right to left, the gas previously drawn into the left air chamber from an air inlet pipe 45 on the left can be introduced into the brush rod 40 from an air outlet pipe 46 on the left during the movement of the piston block 44 to the left, and discharged from the air blowing port 47. Conversely, during this action, the right air chamber can draw external gas from the air inlet pipe 45 on the right. When the piston block 44 moves from left to right, the gas previously drawn into the right air chamber from an air inlet pipe 45 on the right side can be introduced into the brush rod 40 from an air outlet pipe 46 on the right side during the movement of the piston block 44 to the right, and discharged from the air blowing port 47; on the contrary, the left air chamber draws external gas from the air inlet pipe 45 on the left side during this movement; That is to say, by dividing the closed cylinder 41 into two left and right air chambers through the piston block 44, "continuous" blowing can be achieved at the air port 47 during the reciprocating horizontal movement of the piston block 44 driven by the brush rod 40, thereby enhancing the continuous cleaning of the bristle part of the brush rod 40 by the air port 47 and the continuous cooling of the friction material on the transmission belt 22.

[0039] Reference Figure 1 and Figure 2 As shown, a shell 50 is installed at the bottom end of the wooden beam 02. The shell 50 can be made of a flexible rubber material. The shell 50 is wrapped around the outside of the support part 10 as a whole. When in use: the outer shell 50 is entirely covered on the outer side of the support part 10 to form a shielding effect, and the outer shape of the outer shell 50 can be selected to be suitable for the type of the target building, so that the entire device is installed on the wooden building, which has coordination and aesthetics.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A friction damper for mortise and tenon joints of an ancient wooden structure, comprising a wooden column (01) and a wooden beam (02) connected to the wooden column (01) by mortise and tenon joints, characterized in that: Also includes, The support part (10) is installed between the wooden column (01) and the wooden beam (02); The support part (10) can be placed as a whole on the upper side or the lower side of the node of the wooden beam (02); The support portion (10) is used to provide support when the wooden beam (02) produces a small deformation relative to the wooden column (01) at a corner, and to provide vibration reduction when a large deformation occurs.

2. The friction damper for the mortise and tenon joints of the ancient wooden frame according to claim 1, characterized in that: The support portion (10) specifically comprises a slide rail (11), a slide block (12) and a diagonal support rod (13); The slide rail (11) is installed on the length side of the wooden beam (02); The slide block (12) is slidably mounted in the slide rail (11); The diagonal brace (13) is hinged on the wooden column (01), and the other end is hinged to the slider (12); At least one wall portion of the slide rail (11) in contact with the slider (12) is installed with a friction energy-absorbing material to increase the resistance of the slider (12) during sliding.

3. The friction damper for the mortise and tenon joints of the ancient wooden frame according to claim 2, characterized in that: The slide rail (11) is composed of two inclined wall portions, which together form a dovetail-shaped slide groove; The surface of the sliding block (12) located in the sliding groove of the sliding rail (11) is in contact with the two wall portions.

4. The friction damper for the mortise and tenon joints of the ancient wooden frame according to claim 3, characterized in that: A mounting groove (20) is formed through the wall of at least one of the slide rails (11); A support beam (21) is installed in the installation groove (20); A rotating rod (23) located above the support beam (21) is also installed in the installation groove (20); A transmission belt (22) whose outer surface is always in contact with the surface of the slider (12) is tightly sleeved between the rotating rod (23) and the support beam (21); The friction energy absorbing material is adhered to the outer surface of the transmission belt (22).

5. The friction damper for the mortise and tenon joints of the ancient wooden frame according to claim 4, characterized in that: A motor (30) is also mounted on the slide rail (11); One end of the rotating rod (23) extends to the outside of the slide rail (11), and the extended end is connected to the output shaft of the motor (30) via a pulley assembly.

6. The friction damper for the mortise and tenon joints of the ancient wooden frame according to claim 5, characterized in that: The surface of the rotating rod (23) is also circumferentially distributed with a plurality of driving teeth (31); The inner surface of the transmission belt (22) is also provided with transmission teeth (32) meshing with the driving teeth (31); The support beam (21) is also provided with an avoidance groove (33) for accommodating the transmission gear (32).

7. The friction damper for the mortise and tenon joint of the ancient wooden frame according to claim 5 or 6, characterized in that: A brush rod (40) is also mounted on the slide rail (11); The bristle portion of the brush rod (40) is always in contact with the outer surface of the transmission belt (22).

8. The friction damper for the mortise and tenon joints of the ancient wooden frame according to claim 7, characterized in that: A cylinder (41) is also mounted on the slide rail (11); The rod portion of the brush rod (40) is sealingly and slidably connected to the cylinder (41); A reciprocating screw rod (42) is also installed at the extended end of the rotating rod (23); The reciprocating screw rod (42) is sleeved with a moving block (43); The bottom end of the moving block (43) is fixedly connected to the rod portion of the brush rod (40).

9. The friction damper for the mortise and tenon joint of the ancient wooden frame according to claim 8, characterized in that: A piston block (44) is also mounted on the rod portion of the brush rod (40) located inside the cylinder (41); The side surface of the piston block (44) is slidably fitted with the inner wall of the cylinder (41); Both ends of the cylinder (41) are connected to an air inlet pipe (45) equipped with a one-way valve; An air outlet pipe (46) with a one-way valve is provided on both sides of the piston block (44); the brush rod (40) is hollow inside, and the air outlet pipe (46) is in communication with the brush rod (40); The brush rod (40) is provided with a plurality of air blowing ports (47) facing the bristle portion.

10. The friction damper for the mortise and tenon joints of the ancient wooden frame according to claim 1, characterized in that: An outer shell (50) is installed at the bottom end of the wooden beam (02), and the outer shell (50) is entirely wrapped around the outside of the support portion (10).

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