A sawing vibration suppression jig for aluminum alloy building profiles

Abstract

The application discloses a sawing vibration suppression clamp for an aluminum alloy building sectional material, which comprises a support, a pressing mechanism, an extension mechanism, a vibration suppressor frame, a supporting rod and vibration suppressors, wherein the pressing mechanism comprises a Z-direction pressing mechanism, a cantilever pressing mechanism and an X-direction pressing mechanism, the Z-direction pressing mechanism and the cantilever pressing mechanism are arranged on the support, the vibration suppressors comprise a Z-direction vibration suppressor, a cantilever vibration suppressor and an X-direction vibration suppressor, the vibration suppressor frame is connected with the output end of the Z-direction pressing mechanism, the Z-direction vibration suppressor is connected on the vibration suppressor frame, the cantilever vibration suppressor is connected with the output end of the cantilever pressing mechanism, the X-direction vibration suppressor is connected with the output end of the X-direction pressing mechanism, and the supporting rod is connected with the output end of the extension mechanism. The sectional material is arranged between a sawing equipment workbench and the vibration suppressors, the pressing mechanism pushes the vibration suppressors to press on the sectional material, and the extension mechanism pushes the supporting rod to top on the sectional material. The vibration suppression clamp can enhance the sectional material structural rigidity, block vibration transmission, absorb and convert vibration energy, and thus the sawing vibration can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a clamp for inhibiting vibration of an aluminum alloy building profile during sawing, belonging to the technical field of machining vibration inhibition. BACKGROUND

[0002] Aluminum alloy building profiles are widely used in the fields of building doors and windows and building curtain walls due to their high mechanical strength, light weight, easy processing and corrosion resistance. The aluminum alloy building profiles are generally standard profiles of fixed length when they are shipped, and the first process in the processing plant is to cut them according to the product size requirements. Sawing is widely used in the cutting process of aluminum profiles because of its convenience, low cost and high efficiency. Referring to Figure 1 , the structure of the aluminum alloy building profile 19 has a cantilever 20 with a short side on its outer side, forming a cantilever structure. During sawing, one side of the cantilever 20 leans against the positioning block in the X direction, and the positioning block plays a role in X-direction positioning.

[0003] During sawing and cutting, periodic cutting forces are generated due to the cutting, friction and tearing between the teeth and the workpiece, which easily causes the tool-workpiece cutting system to vibrate. Taking disc sawing as an example, due to the thin-walled and hollow characteristics of the profile section, the disc saw will cut into and out of the material multiple times in one rotation cycle, causing changes in the amplitude and frequency of the periodic cutting force and exacerbating the unstable vibration state of the cutting system. In addition, due to the hollow characteristics of the profile, a certain shape of the cavity will have a series of resonance frequencies, and the cavity will significantly amplify the cutting noise, resulting in loud noise during cutting.

[0004] Severe vibration and noise will seriously affect the surface quality and machining accuracy of the workpiece, accelerate tool wear, and even reduce the service life of the machine tool. Moreover, unreasonable sawing noise will also cause serious noise pollution in the factory workshop, affecting the health of the operators.

[0005] Currently, the main methods for inhibiting sawing machining vibration are adjusting processing parameters and optimizing tool structure, which can reduce vibration to a certain extent. Generally speaking, the lower the processing parameters, the smaller the vibration and noise caused. Considering production efficiency, processing parameters cannot be simply reduced.

[0006] In terms of vibration suppression clamps, the existing technology mainly achieves the purpose of suppressing vibration by increasing the structural stiffness, and is mainly aimed at milling and turning production scenarios. There is no vibration suppression clamp for building profile sawing.

[0007] A cutting mechanism for suppressing cutting chatter as disclosed in CN115213705A includes a main plate and a vibration suppression mechanism, the vibration suppression mechanism includes a mounting component and a damper, and a damping hole is formed on one side of the outer surface of the main plate. The cutting mechanism only absorbs the slight chatter generated by the cutting knife during cutting through the damper.

[0008] CN114147530A discloses a cutting vibration reduction device, which comprises a shell, a containing cavity is arranged in the shell, an air suction port and an adsorption end face are arranged on the shell, the air suction port is suitable for connecting an external air extraction unit; a plurality of vibration suppression units are arranged in the containing cavity, one end of each vibration suppression unit is arranged in the containing cavity, the other end of each vibration suppression unit penetrates through the adsorption end face, an air inlet is arranged on each vibration suppression unit, the air inlets are in communication with the air suction port, and each vibration suppression unit has a vibration suppression state of being adsorbed on a wall to be reduced in vibration under the action of the air extraction unit; and an elastic assembly is arranged between the vibration suppression units and the shell and is suitable for providing elastic force for the relative movement between the vibration suppression units and the shell. The device realizes vibration reduction through the combination of the air extraction unit, the vibration suppression unit and the elastic assembly, and has a complex structure and is suitable for cutting vibration reduction.

[0009] CN216608011U discloses a sawing clamp, which is only used for straightening profiles and satisfying various profile pressing, and does not involve the problem of suppressing vibration.

[0010] CN112443621A discloses a passive damper for suppressing cutting vibration of a thin-walled workpiece, which comprises a vacuum connection unit, a vibration suppression unit and a bandwidth adjustment unit. The passive damper is connected to the thin-walled workpiece in a vacuum adsorption mode through the vacuum connection unit, the vibration suppression unit is based on the energy dissipation vibration reduction principle, and the vibration suppression unit transforms and dissipates the vibration energy of the thin-walled workpiece in a multi-damping coupling mode, so as to suppress the chatter phenomenon of the thin-walled workpiece in milling processing. The number of the extended mass disc and the extended damping disc can be adjusted through the bandwidth adjustment unit, and then the vibration suppression bandwidth can be adjusted. The passive damper is not suitable for suppressing vibration during profile sawing.

[0011] CN114294363A discloses a vibration suppression and noise reduction unit structure, which comprises a support column, a fence frame and a counterweight. The support column has a support end and a mounting end, the mounting end is used for connecting a structure to be suppressed in vibration, and the fence frame is mounted on the support end. The counterweight comprises a plurality of counterweights, wherein the counterweight has any one of the following mounting forms: the counterweight is mounted on the fence frame; the counterweight is mounted on the fence frame through an elastic rod; and the counterweight is mounted on the support column through an elastic rod. The vibration suppression and noise reduction unit structure is suitable for installation on the surface of a large curved surface of a structure to be suppressed in vibration, and is not suitable for suppressing vibration during profile sawing. SUMMARY

[0012] In view of the deficiencies of the prior art in solving the problems of vibration and noise generated during sawing of aluminum alloy building profiles, the present application provides a sawing vibration suppression clamp for aluminum alloy building profiles, which has good vibration suppression effect during sawing.

[0013] The sawing vibration suppression clamp for aluminum alloy building sectional material of the present application adopts the following technical solutions:

[0014] The vibration suppression clamp comprises a support, a pressing mechanism, an extension mechanism, a vibration suppressor support, a support rod and a vibration suppressor, the pressing mechanism comprises a Z-direction pressing mechanism, a cantilever pressing mechanism and an X-direction pressing mechanism, the Z-direction pressing mechanism and the cantilever pressing mechanism are arranged on the support, the vibration suppressor comprises a Z-direction vibration suppressor, a cantilever vibration suppressor and an X-direction vibration suppressor, the vibration suppressor support is connected with the output end of the Z-direction pressing mechanism, the Z-direction vibration suppressor is connected on the vibration suppressor support, the cantilever vibration suppressor is connected with the output end of the cantilever pressing mechanism, the X-direction vibration suppressor is connected with the output end of the X-direction pressing mechanism, and the support rod is connected with the output end of the extension mechanism.

[0015] The Z-direction pressing mechanism, the cantilever pressing mechanism and the X-direction pressing mechanism all adopt pressing cylinders, and the vibration suppressor support is hinged with the piston rods of the pressing cylinders; the air inlets of the pressing cylinders are connected with a gas source through a gas conveying pipe and a pressure regulating valve, and the pressure regulating valve is connected with a gas pressure control unit. The pressing mechanism can also adopt an oil cylinder, an electric cylinder, a gear and rack transmission, a screw transmission and other reciprocating drive mechanisms.

[0016] The extension mechanism adopts an extension cylinder, and the support rod is hinged with the piston rod of the extension cylinder; the air inlet of the extension cylinder is connected with a gas source through a gas conveying pipe and a pressure regulating valve, and the pressure regulating valve is connected with a gas pressure control unit. The extension cylinder can also adopt an oil cylinder, an electric cylinder, a gear and rack transmission, a screw transmission and other reciprocating drive mechanisms.

[0017] A guide column is arranged on the vibration suppressor support, and a guide column perforation is arranged on the support, and the guide column passes through the guide column perforation. During the up and down movement of the vibration suppressor support, the guide column plays a role in keeping stable operation, so that the multiple vibration suppressors are synchronously operated.

[0018] A long hole for mounting the Z-direction vibration suppressor is arranged on the vibration suppressor support, so that the mounting position of the vibration suppressor can be adjusted.

[0019] A laser displacement sensor is mounted on the support, and a laser distance measuring sensor is mounted on the support rod, and the laser displacement sensor and the laser distance measuring sensor are connected with a control unit (a data acquisition processor, prior art). The laser displacement sensor is used for monitoring the vibration frequency of the sectional material during sawing, and transmitting data to the control unit, according to the vibration frequency of the sectional material, the control unit controls the pressing force of the pressing mechanism, realizes the stiffness adjustment of the vibration suppressor, adjusts the natural frequency of the vibration suppressor, when the natural frequency of the vibration suppressor is equal to the sawing vibration frequency of the sectional material, the vibration suppressor will achieve the optimal vibration suppression effect. The laser distance measuring sensor can detect the height of the support rod in real time, according to the data fed back by the laser distance measuring sensor, so that the extension mechanism can realize accurate control of the height of the support rod.

[0020] The Z-direction vibration damper, cantilever vibration damper and X-direction vibration damper have the same structure, including a cylinder, a piston rod and a piston, the piston is arranged in the cylinder, the piston rod is connected to one side of the piston, the piston rod extends out of the end cover of the cylinder and is connected to the vibration damper frame, a spring is sleeved on the part of the piston rod in the cylinder, and the cavity on the other side of the piston in the cylinder (the cavity region without the piston rod) is filled with damping oil. The volume ratio of the damping oil to the remaining space in the cavity on one side of the cylinder is 0.5-1 (the damping oil does not fill up). A rubber gasket is installed at the bottom of the cylinder.

[0021] The working principle of the above-mentioned vibration damper is that the piston is pushed to move, so that the damping oil and the air between the damping oil and the piston are all in a high-pressure state, when the vibration is transmitted to the vibration damper from the profile, due to the damping, buffering and other characteristics of the damping oil itself, the vibration damper will have good vibration isolation effect, at the same time, the vibration will make the damping oil in the vibration damper start to move, and the existence of the air above the damping oil makes the damping oil have enough movement space, in the process of movement of the damping oil, the vibration energy is converted into kinetic energy of the damping oil, and the internal friction of the damping oil will also promote the conversion of the kinetic energy into internal energy of the damping oil, further consuming the vibration energy. When the vibration is transmitted to the piston, the vibration of the piston will cause the stretching and compression of the spring, so as to absorb the vibration energy and reduce the vibration.

[0022] The above-mentioned vibration damper is used for suppressing the vibration generated when the profile is sawn on the sawing equipment (sawing machine), the support, X-direction pressing mechanism and telescopic mechanism are respectively installed on the workbench of the sawing equipment, the profile is placed between the workbench of the sawing equipment and each vibration damper, and the outer side of the cantilever leans against the positioning block. The Z-direction pressing mechanism pushes the Z-direction vibration damper to press on the top surface of the profile from top to bottom, the cantilever pressing mechanism pushes the cantilever vibration damper to press on the cantilever of the profile from top to bottom, the X-direction pressing mechanism pushes the X-direction vibration damper to press on the profile from left to right (see Figure 1 ), the bottom of each vibration damper (the lower end of the cylinder) directly contacts the profile, and the telescopic mechanism pushes the supporting rod to press on the bottom surface of the cantilever of the profile from bottom to top. During sawing, the corresponding vibration damper absorbs the vibration energy of the profile to reduce the vibration.

[0023] The vibration damper of the present application is applied in the process of sawing the aluminum alloy building profile on the sawing machine, and can be used for clamping aluminum alloy building profiles of various structures or sizes. In the sawing process, the structure stiffness of the aluminum alloy building profile is enhanced, the vibration transmission is blocked, and the vibration energy is absorbed and converted, so as to reduce the sawing vibration. The processing quality of the profile can be effectively improved, the wear rate of the cutter can be reduced, and the service life of the sawing machine can be improved, which has important significance for improving enterprise benefits and reducing environmental noise pollution. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1It is the overall structure schematic diagram of the profile sawing vibration suppression clamp special vibration suppression clamp of the present application.

[0025] Figure 2 It is the structure schematic diagram of the vibration suppressor frame in the present application.

[0026] Figure 3 It is the structure schematic diagram of the vibration suppressor in the present application.

[0027] In the figure: 1. Z-direction vibration suppressor, 2. workbench, 3. telescopic air cylinder, 4. support rod, 5. laser ranging sensor, 6. air conveying pipe, 7. pressure regulating valve, 8. air source, 9. air pressure control unit, 10. data line, 11. vibration suppressor frame, 12. Z-direction pressing air cylinder, 13. laser displacement sensor, 14. guide column, 15. fish eye joint, 16. support, 17. cantilever pressing air cylinder, 18. cantilever vibration suppressor, 19. aluminum alloy building profile, 20. cantilever, 21. X-direction vibration suppressor, 22. X-direction pressing air cylinder;

[0028] 101. piston rod, 102. end cover, 103. cylinder body, 104. shock absorbing oil, 105. rubber gasket, 106. sealing ring, 107. strong spring, 108. piston;

[0029] 1101. guide column mounting hole, 1102. vibration suppressor mounting hole. DETAILED DESCRIPTION

[0030] Figure 1 The overall structure of the aluminum alloy building profile sawing vibration suppression clamp of the present application is given, which comprises a pressing mechanism, a telescopic mechanism, a support rod 4 and a vibration suppressor. The pressing mechanism comprises a Z-direction pressing air cylinder 12, a cantilever pressing air cylinder 17 and an X-direction pressing air cylinder 22, the telescopic mechanism adopts a telescopic air cylinder 3, and the vibration suppressor comprises a Z-direction vibration suppressor 1, a cantilever vibration suppressor 18 and an X-direction vibration suppressor 21.

[0031] The Z-direction pressing air cylinder 12 and the cantilever pressing air cylinder 17 are both mounted on the support 16. The piston rod of the Z-direction pressing air cylinder 12 is connected with the vibration suppressor frame 11 through the fish eye joint 15, and the vibration suppressor frame 11 is provided with the Z-direction vibration suppressor 1. The support 16 is provided with a guide column through hole, see Figure 2The vibration damper frame 11 is provided with a guide column mounting hole 1101 and a vibration damper mounting hole 1102. The guide column mounting hole 1101 is mounted with a guide column 14, which passes through the guide column perforation on the support frame 16, and can ensure the vibration damper frame 11 to run smoothly during the up and down movement, so that the vibration damper frame 11 can press the profiles synchronously, and better vibration damping effect can be achieved. The vibration damper 1 is mounted in the vibration damper mounting hole 1102, which is a long hole, and the position of the vibration damper 1 in the vibration damper mounting hole 1102 can be adjusted. Since the position of the vibration damper 1 in the long hole vibration damper mounting hole 1102 can be adjusted, the distance between the vibration dampers 1 mounted on the vibration damper frame 11 can be adjusted freely according to the size of the profile, and the vibration dampers 1 can be installed or removed freely according to the needs, so that the vibration clamp can be applied to profiles of various sizes.

[0032] The output end of the cantilever pressing cylinder 17 is directly connected with the cantilever vibration damper 18.

[0033] The telescopic cylinder 3 is vertically fixed on the workbench 2 of the sawing equipment, and the piston rod of the telescopic cylinder 3 is hinged with the support rod 4. The cantilever vibration damper 18 is used in cooperation with the support rod 4 to suppress the vibration at the cantilever 20.

[0034] The X-direction pressing cylinder 22 is horizontally installed on the workbench 2, and the output end of the X-direction pressing cylinder 22 is directly connected with the X-direction vibration damper 21 for suppressing the vibration of the aluminum alloy building profile 19 in the X direction.

[0035] The laser distance sensor 5 is fixedly installed on the support rod 4. The laser displacement sensor 13 is fixedly installed on the support frame 16. The air inlets of the Z-direction pressing cylinder 12, the cantilever pressing cylinder 17, the X-direction pressing cylinder 22 and the telescopic cylinder 3 are connected with the gas storage tank through the gas conveying pipe 6 and the pressure regulating valve 7, and the gas storage tank is connected with the gas source 8. The laser distance sensor 5, the pressure regulating valve 7 and the laser displacement sensor 13 are respectively connected with the gas pressure control unit 9 through the data line 10.

[0036] The Z-direction vibration damper 1, the cantilever vibration damper 18 and the X-direction vibration damper 21 have the same structure, as shown in Figure 3 Fig. 5, which comprises a cylinder body 103, a piston rod 101, a piston 108 and a strong spring 107. The cylinder body 103 is provided with an end cover 102, the piston 108 is arranged in the cylinder body 103, and a sealing ring 106 is arranged between the piston 108 and the cylinder body 103. One end of the piston rod 101 is connected with the piston 108, and the other end extends out of the end cover 102. The strong spring 107 is sleeved on the part of the piston rod 101 in the cylinder body 103. The bottom of the cylinder body 103 is provided with a rubber pad 105 through bolts. The cavity region of the cylinder body 103 without the piston rod 101 is filled with oil. Figure 2The Z-direction vibration damper 1 is connected to the vibration damper frame 11 through its piston rod 101. The cantilever vibration damper 18 is directly connected to the piston rod of the cantilever compression cylinder 17 through its piston rod 101. The X-direction vibration damper 21 is directly connected to the piston rod of the X-direction compression cylinder 22 through its piston rod 101.

[0037] The above-mentioned vibration damper clamp is used to suppress the vibration generated when sawing the aluminum alloy building profile 19 on the sawing machine. The vibration suppression process is as follows.

[0038] The bracket 16, the telescopic cylinder 3 and the X-direction compression cylinder 22 are installed on the workbench 2 of the sawing equipment, and the aluminum alloy building profile 19 is placed on the workbench 2 of the sawing equipment between the vibration dampers 1, and the outer side of the cantilever 20 is positioned by the positioning block. The X-direction compression cylinder 22 pushes the X-direction vibration damper 21 to press on the outer side of the large face of the aluminum alloy building profile 19 in the X-direction. The Z-direction compression cylinder 12 pushes the vibration damper frame 11 and the Z-direction vibration damper 1 thereon to press downward on the aluminum alloy building profile 19, and the rubber pad 105 at the bottom of the Z-direction vibration damper 1 directly contacts the large face of the aluminum alloy building profile 19. The rubber pad at the bottom of the cantilever vibration damper 18 contacts the top surface of the cantilever 20 on one side of the aluminum alloy building profile 19, and the telescopic cylinder 3 pushes the support rod 4 to press upward on the bottom surface of the cantilever 20.

[0039] According to the size of the profile, the opening and closing of the pressure regulating valve 7 are controlled by the air pressure control unit 9 to control the extension length of the piston rod of the telescopic cylinder 3, thereby adjusting the position height of the support rod 4, so that the support rod 4 contacts the bottom surface of the cantilever 20 in the aluminum alloy building profile 19, achieving the purpose of supporting the cantilever structure of the profile and enhancing the rigidity of the cantilever structure to reduce vibration. In this process, the laser ranging sensor 5 can detect the height of the support rod 4 in real time, and according to the data fed back by the laser ranging sensor 5, the air pressure control unit 9 can realize accurate control of the height of the support rod 4 by controlling the pressure regulating valve 7. During sawing, the air pressure control unit 9 can adjust the extension length of the piston rod of the telescopic cylinder 3 in real time by controlling the pressure regulating valve 7 according to the height change of the support rod 4 detected by the laser ranging sensor 5, so that the support rod 4 can maintain a fixed height without being affected by the sawing vibration, thereby achieving the purpose of reducing sawing vibration.

[0040] The damping oil 104 does not completely fill the cavity below the piston 108, and there is a certain space between the damping oil 104 and the piston 108. In the working state, the rubber pad 105 is in direct contact with the aluminum alloy building profile 19, and the pressing cylinder 12 pushes the piston 108 downward to extrude the damping oil 104 through the damper frame 11, so that the damping oil 104 and the air above the damping oil 104 are in a high pressure state. When the vibration is transmitted from the aluminum alloy building profile 19 to the damper, due to the damping, buffering and other characteristics of the damping oil 104 itself, the difference in material between the damper cylinder 103 and the damping oil 104, and the existence of high pressure gas above the damping oil 104, the damper will have good vibration isolation effect, and the vibration isolation effect will be more obvious when the damping oil 104 is in a high pressure state. At the same time, the vibration will make the damping oil 104 in the damper 1 start to move, and the existence of air above the damping oil 104 makes the damping oil 104 have enough movement space. In the process of movement of the damping oil 104, the vibration energy is converted into kinetic energy of the damping oil 104, and the internal friction of the damping oil 104 also promotes the conversion of its kinetic energy into internal energy, further consuming the vibration energy. The strong spring 107 installed between the piston 108 and the end cover 102 can keep the end cover 102 and the piston 108 at a proper distance in the non-working state, avoiding the piston 108 from moving upward and colliding with the end cover 102. At the same time, when the vibration is transmitted to the piston 108, the vibration of the piston 108 will cause the stretching and compression of the strong spring 107, achieving the purpose of absorbing vibration energy and reducing vibration. Through the above several ways, the damper can achieve good vibration damping and isolation effect.

[0041] The laser displacement sensor 13 is used to monitor the vibration frequency of the aluminum alloy building profile 19 during sawing, and transmit data to the air pressure control unit 9. According to the vibration frequency of the aluminum alloy building profile 19, the air pressure control unit 9 can control the size of the air pressure in the pressing cylinder 12 through the pressure regulating valve 7, and then control the pressing force, realize the stiffness adjustment of the damper 1, and adjust the natural frequency of the damper. When the natural frequency of the damper is equal to the sawing frequency of the profile, the damper will achieve the best damping effect.

Claims

1. A damped fixture for sawing of aluminium alloy building profiles, c h a r a c t e r i s e d in that: The support, the compression mechanism, the telescopic mechanism, the vibration damper frame, the support rod and the vibration damper are included, the compression mechanism includes Z-direction compression mechanism, cantilever compression mechanism and X-direction compression mechanism, the Z-direction compression mechanism and the cantilever compression mechanism are arranged on the support, the vibration damper includes Z-direction vibration damper, cantilever vibration damper and X-direction vibration damper, the vibration damper frame is connected with the output end of the Z-direction compression mechanism, the Z-direction vibration damper is connected on the vibration damper frame, the cantilever vibration damper is connected on the output end of the cantilever compression mechanism, the X-direction vibration damper is connected on the output end of the X-direction compression mechanism, the support rod is connected with the output end of the telescopic mechanism; The laser displacement sensor is installed on the support, and the laser ranging sensor is installed on the support rod, and the laser displacement sensor and the laser ranging sensor are connected with the control unit; The guide column is arranged on the vibration damper frame, and the guide column passes through the guide column hole on the support; The long hole for installing the Z-direction vibration damper is arranged on the vibration damper frame; The Z-direction vibration damper, the cantilever vibration damper and the X-direction vibration damper have the same structure, including a cylinder body, a piston rod and a piston, the piston is arranged in the cylinder body, one side of the piston is connected with the piston rod, the end cover of the cylinder body is connected with the vibration damper frame, the part of the piston rod in the cylinder body is sleeved with a spring, the other side of the piston in the cylinder body is filled with damping oil, and a certain space is left.

2. The aluminum alloy architectural section sawing dampening fixture of claim 1 characterized by: The Z-direction compression mechanism, the cantilever compression mechanism and the X-direction compression mechanism all adopt compression cylinders, and the vibration damper frame is hinged with the piston rod of the compression cylinder;The air inlet of the compression cylinder is connected with the gas source through the gas pipe and the pressure regulating valve, and the pressure regulating valve is connected with the gas pressure control unit.

3. The aluminum alloy architectural extrusions sawing dampening fixture of claim 1 characterized by: The telescopic mechanism adopts a telescopic cylinder, and the support rod is hinged with the piston rod of the telescopic cylinder;The air inlet of the telescopic cylinder is connected with the gas source through the gas pipe and the pressure regulating valve, and the pressure regulating valve is connected with the gas pressure control unit.

4. The aluminum alloy architectural extrusions sawing dampening fixture of claim 1 characterized by: The volume ratio of the damping oil in the cavity on one side of the cylinder body to the space left is 0.5-1.

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