Prestressed anti-warping mechanism of comb plate telescopic device and its application in comb plate telescopic device

Abstract

The present invention relates to a bridge expansion device, and more particularly to a prestressed anti-warping mechanism of a comb plate expansion device and its application in the comb plate expansion device. The prestressed anti-warping mechanism includes a comb plate expansion device including a movable comb plate and a fixed comb plate; the cavity formed by the rear of the movable comb plate and the foundation below it also includes a prestressed tension plate, a pressure-bearing rubber support and an elastic element respectively arranged in the cavity below the rear of the movable comb plate along the transverse direction of the bridge, the upper ends of the prestressed tension plate, the pressure-bearing rubber support and the elastic element are matched with the movable comb plate, and the lower ends thereof are fixed to the foundation below the movable comb plate. The present invention solves the problems of the prior art that warping is easy to occur and generates a lot of noise, and has the advantages of obvious noise reduction and anti-warping functions, a small response amplitude of the prestressed anti-warping expansion device in the present invention under vertical load, and excellent driving comfort.

Description

Technical Field

[0001] The invention relates to a bridge expansion device, in particular to a prestressed anti-warping tooth mechanism of a comb plate expansion device and the application of the prestressed anti-warping tooth mechanism in the comb plate expansion device. Background Art

[0002] The expansion device is one of the important functional components of bridge engineering. In order to meet the needs of bridge beam deformation, a bridge expansion device is generally installed between the two ends of the bridge beam, between the beam end and the abutment, or at the hinged position of the bridge. During the operation of the bridge project, the creep caused by vehicle loads, the bridge's own materials and temperature, wind force, etc., will cause the bridge to shrink and stretch. In order to ensure safe and stable driving of vehicles, the expansion device installed on the bridge must meet the various changes in the beam body. The comb plate expansion device commonly used in bridge engineering consists of a movable comb plate and a fixed comb plate. The fixed comb plate is connected to the bridge deck at one end of the bridge with connecting bolts, and the movable comb plate is bolted to the bridge deck at the other end. The comb plate expansion device is widely used on domestic highway bridges due to its unique advantages of shallow installation depth, good surface flatness, and comfortable driving. The existing comb-tooth plate expansion and contraction device refers to and implements the "Unitary Multi-Directional Displacement Comb-Shaped Plate Bridge Expansion and Contraction Device" (JT / T 723-2008). With the widespread application of comb-tooth plate expansion and contraction devices, its existing problems have become increasingly prominent, especially in some beam joints with larger distances. Since the distance between the beam joints is too wide and the teeth of the comb-tooth plate are correspondingly longer, when subjected to vehicle impact loads and uneven settlement of the beam structures on both sides, the teeth are prone to warping and generate loud noise, affecting driving comfort and safety.

[0003] "Design of Low-Noise Bridge Expansion Device" (Xie Yuan, Kong Yanyan; Journal of Lanzhou Institute of Technology, Vol. 20, No. 6, December 2013) Through parametric drive and innovative structural design, improvements have been made to the expansion device in terms of noise, comfort, durability and maintenance.

[0004] "Research and Application of Bridge Noise Reduction and Expansion Devices" (Zhou Xilong, Lu Yuanchun, Li Xiong, Zhao Pengxian; Highway, July 2015, Issue 7) mainly adopts technical measures such as structural design of steel panels, elimination of the cavity of modular steel sections, and fixing rubber strips on the steel sections with bolts, nuts and pressure strips. The overall steel noise reduction and expansion device reduces the noise generated by the passing of wheels by about 2 to 4 dB, with obvious noise reduction effect, improving the overall stiffness and fatigue performance of the structure, and successfully solving the problem of replacing rubber strips.

[0005] The applicant has not found any patent literature reports related to this application in the domestic patent database. Summary of the invention

[0006] The present invention provides a prestressed anti-tooth warping mechanism for a comb plate telescopic device. Applying the prestressed anti-tooth warping mechanism in the present invention to the comb plate telescopic device can effectively prevent the occurrence of tooth warping of the movable comb plate, and has a good vibration reduction and noise reduction effect.

[0007] The overall technical concept of the present invention is:

[0008] The prestressed anti-warping tooth mechanism of the comb tooth plate expansion and contraction device comprises a comb tooth plate expansion and contraction device including a movable comb tooth plate arranged on the expansion joint and a fixed comb tooth plate arranged opposite to the comb teeth thereof; it is characterized in that a cavity is formed between the rear part of the movable comb tooth plate and the foundation below it, and further comprises a prestressed tension plate, a pressure-bearing rubber bearing and an elastic element which are respectively arranged in the cavity below the rear part of the movable comb tooth plate at intervals along the transverse bridge direction, the upper ends of the prestressed tension plate, the pressure-bearing rubber bearing and the elastic element are matched with the movable comb tooth plate, and the lower ends thereof are fixed to the foundation below the movable comb tooth plate.

[0009] Application of the prestressed anti-warping tooth mechanism of the comb plate telescopic device in the comb plate telescopic device.

[0010] The specific technical concept of the present invention also includes:

[0011] In order to facilitate smooth horizontal movement of the movable comb plate and reliable cooperation between components, the preferred technical implementation method is that a tooth plate pad is provided on the upper surface of the foundation below the front of the movable comb plate and the fixed comb plate, the exposed end of the anchor connects and fixes the tooth plate pad to the fixed comb plate, and a water stop is provided at the joint of the expansion joint.

[0012] In order to facilitate the connection between the prestressed plate and the movable comb plate, and to facilitate the pre-tightening of the pressure-bearing rubber bearing after adjusting the movable comb plate, the preferred technical implementation means is that the lower end of the prestressed plate is fixed to the base below the movable comb plate, and a gap is provided between the upper end of the prestressed plate and the movable comb plate and connected through a third connecting member, and the third connecting member is selected from bolts and threaded holes provided on the prestressed plate and adapted thereto.

[0013] The main function of the elastic element is to act on the movable comb plate to prevent it from warping. It can adopt a variety of structural parts and materials with the above functions, including but not limited to the following technical implementation means. The elastic element is selected from rubber, polyurethane, spring or a combination thereof.

[0014] The main function of the pressure-bearing rubber bearing is to bear the impact load of the vehicle, support the movable comb plate, and achieve the effect of vibration reduction and noise reduction. The preferred technical implementation method is that the pressure-bearing rubber bearing is composed of rubber and thin steel plates horizontally distributed and longitudinally spaced in the rubber.

[0015] Applying a set of clockwise superimposed moments to the movable comb plate has a better technical effect on preventing the movable comb plate from tilting. A more preferred technical implementation means is that the pressure-bearing rubber bearing adopts an integrated structure, or a combination of at least two parallel rubber bearings with different stiffness and height.

[0016] To facilitate the connection between the pressure-bearing rubber support and the movable comb plate, the preferred technical implementation method is that the upper end of the pressure-bearing rubber support is connected to the movable comb plate through a second connecting member, and the second connecting member is preferably a bolt and a threaded hole opened on the pressure-bearing rubber support and adapted thereto.

[0017] In order to facilitate the connection between the pressure-bearing rubber bearing, elastic element, prestressed tension plate and the foundation below the movable comb plate, and thus meet the needs of standardized and rapid assembly, the preferred technical implementation method is that a bottom plate is provided on the upper surface of the foundation below the rear of the movable comb plate along the transverse direction, and the bottom plate is fastened with L-shaped bolts anchored in the foundation below it, and the prestressed tension plate, pressure-bearing rubber bearing and elastic element are positioned and assembled with the bottom plate through connecting components.

[0018] To facilitate the assembly of the elastic element and the base plate, the preferred technical implementation method is that a top plate that is overall n-shaped and compatible with the elastic element is provided on the upper surface of the base plate along the transverse bridge direction, and a gap is provided between the upper surface of the top plate and the lower surface of the movable comb plate.

[0019] The preferred assembly method of the elastic element is that the elastic element is located in the top plate and connected to the movable comb plate through a first connecting member, and the first connecting member is a bolt and a nut adapted thereto.

[0020] In order to verify the technical effect of the present invention, the applicant conducted the following experiments:

[0021] 1. Noise reduction test

[0022] 1. Test site: Gaobeidian section of Rongwu Expressway.

[0023] 2. Experimental personnel: Gui Jianchen, Zhang Xing, Chen Zheng, Rong Jianding.

[0024] 3. Test time: August 16, 2021.

[0025] 4. Test equipment: AWA5636 sound level meter, sampling interval 0.01s.

[0026] 5. Test conditions: The vehicle mass is about 1.5 tons, and the noise monitoring point is 70 cm away from the wheel.

[0027] 6. Test steps: The vehicle passes through the prestressed anti-warping tooth telescopic device of the present invention and the 160-type ordinary comb plate telescopic device at speeds of 60 km / h, 90 km / h and 120 km / h respectively.

[0028] 7. Test results: Record the noise curve as follows Figure 5A , 5B , 6A, 6B, 7A, 7B, the results show that when the same vehicle passes through the two telescopic devices at different speeds, the prestressed anti-warping tooth telescopic device in the present invention exhibits more excellent noise reduction performance.

[0029] 2. Vibration test

[0030] 1. Test location: Hebei Baoli Engineering Equipment Co., Ltd.

[0031] 2. Experimental personnel: Gui Jianchen, Zhang Xing, Chen Zheng, Rong Jianding.

[0032] 3. Test time: January 8, 2021.

[0033] 4. Test equipment: CYT9200 vibration transmitter, XSW digital display instrument, WQSF-400 microcomputer-controlled electro-hydraulic servo bridge telescopic device test machine, the prestressed anti-warping tooth telescopic device of the present invention, and 160-type ordinary comb plate telescopic device.

[0034] 5. Test conditions:

[0035] (1) Before the test, ensure that the overlapping length of the comb teeth of the telescopic device is 1 / 2 of the comb teeth length, and ensure that the telescopic device and the test fixture do not deflect or slip during the entire test process;

[0036] (2) The load loading area is the actual working area of ​​the tire, and the loading position is the center of the seam width. The CYT9200 vibration transmitter and the XSW digital display instrument are placed on the workbench on the side of the movable comb plate, 20 cm away from the side of the tooth plate.

[0037] 6. Test steps: The prestressed anti-warping tooth telescopic device of the present invention and the 160-type ordinary comb plate telescopic device are placed on the workbench respectively, and the force is applied by the telescopic device tester, and the vibration transmitter collects data. The loads shown in Table 1 are applied to the telescopic device respectively, and the telescopic device and the tooling shall not deflect or slip during the loading process.

[0038] Table 1

[0039] name Maximum load(KN) Minimum load (KN) Load amplitude (KN) Load frequency(HZ) Loading Values 90 9 81 5

[0040] 7. Test results: record the data of the digital display and draw a curve such as Fig. 8A , 8B ,The results show that under the same vertical load, the response amplitude of the ,prestressed anti-warping tooth expansion and contraction device in the present ,invention is smaller, and the driving comfort is better.

[0041] 3. Anti-cranking test

[0042] 1. Test location: Hebei Baoli Engineering Equipment Co., Ltd.

[0043] 2. Experimental personnel: Gui Jianchen, Zhang Xing, Chen Zheng, Rong Jianding.

[0044] 3. Test time: January 8, 2021.

[0045] 4. Test equipment: WQSF-400 microcomputer-controlled electro-hydraulic servo bridge telescopic device test machine, the prestressed anti-warping tooth telescopic device of the present invention, 160-type ordinary comb plate telescopic device, and ruler.

[0046] 5. Test conditions: Keep the workbench surface level, the thickness of the tooth plates of the two telescopic devices is the same, and the tooth length across the simulated beam gap of the workbench is the same.

[0047] 6. Test steps: Place the prestressed anti-warping tooth telescopic device and the 160-type ordinary comb plate telescopic device of the present invention on the workbench respectively, make the telescopic device in the maximum telescopic state, adjust the workbench on the fixed comb plate side, make the workbench on the fixed comb plate side drop 5mm, 10mm, 15mm, and 20mm respectively, observe the contact between the tooth end of the movable comb plate and the fixed comb plate pad, and record the distance between the bottom surface of the tooth end of the movable comb plate and the top surface of the fixed comb plate pad.

[0048] 7. Test results: The measured data are recorded as shown in Table 2. The results show that when the vertical displacement of the 160-type ordinary comb plate telescopic device is small, the active comb plate will not be suspended from the pad, but when the vertical displacement is large, the active comb plate and the pad are suspended, and the tooth warping phenomenon occurs. Since the prestressed anti-tooth warping telescopic device is equipped with a pre-tightening structure, it can ensure that the active comb plate and the pad are not suspended in the case of large vertical displacement, and can adapt to larger vertical rotation angles to prevent the occurrence of tooth warping.

[0049] Table 2

[0050] Workbench lowering height 5mm 10mm 15mm 20mm Anti-warping tooth telescopic device in the present invention 0mm 0mm 0mm 0mm 160 type ordinary comb plate telescopic device 0mm 0mm 3mm 8mm

[0051] The substantial features and significant technical advances of the present invention are:

[0052] 1. The present invention realizes pre-tightening of the movable comb plate and the pressure-bearing rubber bearing by fastening the third connecting member, thereby fastening the prestressed tension plate and the movable comb plate. The pressure-bearing rubber bearing supports the movable comb plate, and the pressure-bearing rubber bearing can also achieve the effects of vibration reduction, noise reduction and vertical displacement.

[0053] 2. The elastic element is connected between the movable comb plate and the bottom plate through the top plate and the first connecting member. A gap is provided between the bottom plate and the movable comb plate to accommodate the vertical displacement of the movable comb plate. The movable comb plate is prevented from tilting by tightening the first connecting member.

[0054] 3. The bottom plate is used in conjunction with the hollow structural design of the foundation below the rear of the movable comb plate. While effectively accommodating the structural components, the bottom plate provides an installation basis for the pressure-bearing rubber plate, elastic elements and prestressed tension plates, facilitating the rapid and standardized assembly of parts.

[0055] 4. The structural design of the L-shaped bolt facilitates anchoring to the foundation and facilitates rapid assembly with the base plate.

[0056] 5. The applicant has confirmed through experiments that the comb plate telescopic device using the prestressed anti-tooth warping mechanism of the present invention can effectively reduce noise compared to the existing ordinary comb plate telescopic device, can adapt to larger vertical rotation angles and prevent the occurrence of tooth warping. Under the same vertical load conditions, the prestressed anti-tooth warping telescopic device of the present invention has a smaller response amplitude and provides better driving comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The accompanying drawings of the present invention include:

[0058] Figure 1 A schematic diagram of the first structure of the prestressed anti-warping tooth expansion and contraction device of the present invention.

[0059] Figure 1A yes Figure 1 AA view.

[0060] Figure 1B yes Figure 1 BB direction view.

[0061] Figure 1C yes Figure 1 CC view.

[0062] Figure 1D yes Figure 1 D-direction view.

[0063] Figure 2 Schematic diagram of the second structure of the prestressed anti-warping tooth expansion and contraction device of the present invention.

[0064] Figure 2A yes Figure 2 AA view.

[0065] Figure 2B yes Figure 2 BB direction view.

[0066] Figure 2C yes Figure 2 CC view.

[0067] Figure 2D yes Figure 2 D-direction view.

[0068] Figure 3 Schematic diagram of the third structure of the prestressed anti-warping tooth expansion and contraction device of the present invention.

[0069] Figure 3A yes Figure 1 AA view.

[0070] Figure 3B yes Figure 1 BB direction view.

[0071] Figure 3C yes Figure 1 CC view.

[0072] Figure 3D yes Figure 1 D-direction view.

[0073] Figure 4 Schematic diagram of the bottom plate structure in the present invention.

[0074] Figure 5A This is the noise curve of a vehicle passing through the prestressed anti-warping tooth expansion device at a speed of 60km / h.

[0075] Figure 5B This is the noise curve of a vehicle passing through an ordinary comb plate telescopic device at a speed of 60km / h.

[0076] Fig. 6A This is the noise curve of a vehicle passing through the prestressed anti-warping gear expansion device at a speed of 90km / h.

[0077] Figure 6B This is the noise curve of a vehicle passing through an ordinary comb plate telescopic device at a speed of 90km / h.

[0078] Fig. 7A This is the noise curve of a vehicle passing through the prestressed anti-warping tooth expansion device at a speed of 120km / h.

[0079] Figure 7B This is the noise curve of a vehicle passing through an ordinary comb plate telescopic device at a speed of 120km / h.

[0080] Fig. 8A It is the response amplitude curve after applying load to the prestressed anti-warping tooth expansion device through the CYT9200 vibration transmitter.

[0081] Figure 8B This is the response amplitude curve after applying load to the ordinary comb plate expansion device through the CYT9200 vibration transmitter.

[0082] The reference numerals in the accompanying drawings are as follows:

[0083] 1. Movable comb plate; 2. Fixed comb plate; 3. Elastic element; 3A. First connecting member; 4. Pressure-bearing rubber bearing; 4A. Second connecting member; 4B. First pressure-bearing rubber bearing; 4C. Second pressure-bearing rubber bearing; 5. Anchor; 6. Prestressed tension plate; 6A. Third connecting member; 7. Bottom plate; 7A. Top plate; 8. Tooth plate pad; 9. Waterstop; 10. L-shaped bolt. DETAILED DESCRIPTION

[0084] The accompanying drawings show embodiments of the present invention. The embodiments of the present invention are further described below in conjunction with the accompanying drawings, but should not be construed as limiting the present invention. The protection scope of the present invention shall be based on the contents recorded in the claims. Any replacement of equivalent technical means made according to the specification shall not depart from the protection scope of the present invention.

[0085] Example 1

[0086] The overall structure of this embodiment is as follows Figure 1 , 1A As shown in 1B, 1C, and 1D, it includes a comb plate expansion and contraction device comprising a movable comb plate 1 arranged on the expansion joint and a fixed comb plate 2 arranged opposite to the comb teeth thereof; it is characterized in that a cavity is formed between the rear part of the movable comb plate 1 and the foundation below it, and also includes a prestressed tension plate 6, a pressure-bearing rubber support 4 and an elastic element 3 which are respectively arranged in the cavity below the rear part of the movable comb plate 1 along the transverse bridge direction, the upper ends of the prestressed tension plate 6, the pressure-bearing rubber support 4 and the elastic element 3 are matched with the movable comb plate 1, and the lower ends thereof are fixed to the foundation below the movable comb plate 1.

[0087] Application of the prestressed anti-warping tooth mechanism of the comb plate telescopic device in the comb plate telescopic device.

[0088] A tooth plate pad 8 is provided on the upper surface of the front of the movable comb plate 1 and below the fixed comb plate 2. The exposed end of the anchor 5 connects and fixes the tooth plate pad 8 to the fixed comb plate 2. A water stop 9 is provided at the joint of the expansion joint.

[0089] A bottom plate 7 is provided on the upper surface of the foundation below the rear portion of the movable comb plate 1 along the transverse direction, and the bottom plate 7 is fastened to an L-shaped bolt 10 anchored in the foundation below it.

[0090] The upper surface of the bottom plate 7 is provided with a top plate 7A which is generally n-shaped and adapted to the elastic element 3 along the transverse bridge direction, and the upper surface of the top plate 7A is spaced apart from the lower surface of the movable comb plate 1. The elastic element 3 is located in the top plate 7A and is connected to the movable comb plate 1 through a first connecting member 3A, and the first connecting member 3A is selected from bolts and nuts adapted thereto.

[0091] The lower end of the prestressed tension plate 6 is fixed to the bottom plate 7 by bolts and nuts, and the upper end of the prestressed tension plate 6 is provided with a gap with the movable comb plate 1 and is connected by a third connecting member 6A. The third connecting member is selected from bolts and threaded holes provided on the prestressed tension plate 6 and adapted thereto.

[0092] The elastic element 3 is made of rubber, polyurethane, spring or a combination thereof.

[0093] The pressure-bearing rubber bearing is composed of rubber and thin steel plates horizontally distributed and longitudinally spaced in the rubber. The pressure-bearing rubber bearing 4 adopts an integrated structure.

[0094] The upper end of the pressure-bearing rubber support 4 is connected to the movable comb plate 1 through a second connecting member 4A, and the second connecting member 4A is a bolt and a threaded hole opened on and adapted to the pressure-bearing rubber support 4. The lower end of the pressure-bearing rubber support 4 is fastened to the bottom plate 7 through an L-shaped bolt 10.

[0095] Example 2

[0096] The overall structure of this embodiment is as follows Figure 2 , 2A As shown in 2B, 2C, and 2D, the difference between this embodiment and embodiment 1 is that the prestressed plate 6 and the pressure-bearing rubber bearing 4 are not on the same axis, and the prestressed plate 6 is arranged between the pressure-bearing rubber bearing 4 and the elastic element 3 in the longitudinal direction of the bridge. When the prestressed plate 6 is pre-tightened, the elastic element 3 and the pressure-bearing rubber bearing 4 can apply a set of clockwise superimposed moments to the movable comb plate 1, which has a more significant effect on preventing the movable comb plate 1 from tilting.

[0097] The rest of the structure is the same as that of Example 1.

[0098] Example 3

[0099] The overall structure of this embodiment is as follows Figure 3 , 3A As shown in Figures 3B, 3C, and 3D, the difference between this embodiment and embodiment 1 is that the pressure-bearing rubber bearing 4 includes a first pressure-bearing rubber bearing 4B and a second pressure-bearing rubber bearing 4C which are arranged in parallel, the stiffness of the first pressure-bearing rubber bearing 4B is greater than the stiffness of the second pressure-bearing rubber bearing 4C, and the height of the second pressure-bearing rubber bearing 4C is less than the height of the first pressure-bearing rubber bearing 4B, the second pressure-bearing rubber bearing 4C is arranged close to the outer side of the beam end, and an appropriate gap is provided between the second pressure-bearing rubber bearing 4C and the movable comb plate 1. Therefore, under the action of the preload force, a set of clockwise superimposed torques can be applied to the movable comb plate 1 between the first pressure-bearing rubber bearing 4B and the second pressure-bearing rubber bearing 4C, which has a more significant effect on preventing the movable comb plate 1 from tilting.

[0100] The rest of the structure is the same as that of Example 1.

Claims

1. A prestressed anti-warping tooth mechanism of a comb plate telescopic device, comprising a comb plate telescopic device comprising a movable comb plate (1) arranged on an expansion joint and a fixed comb plate (2) arranged opposite to the comb teeth thereof; characterized in that The cavity formed by the rear of the movable comb plate (1) and the foundation below it also includes a prestressed tension plate (6), a pressure-bearing rubber support (4) and an elastic element (3) which are arranged in the cavity below the rear of the movable comb plate (1) at intervals along the transverse direction of the bridge; the prestressed tension plate (6) and the pressure-bearing rubber support (4) are on the same axis, and in the longitudinal direction of the bridge, the prestressed tension plate (6) and the pressure-bearing rubber support (4) are located on the left side of the elastic element (3); the prestressed tension plate (6) and the pressure-bearing rubber support (4) are located on the left side of the elastic element (3); The distance between the support (4) and the water stop (9) is farther than that between the elastic element (3), or the prestressed plate (6) and the pressure-bearing rubber support (4) are not on the same axis, and the prestressed plate (6) is arranged between the pressure-bearing rubber support (4) and the elastic element (3) in the direction along the bridge; the upper ends of the prestressed plate (6), the pressure-bearing rubber support (4) and the elastic element (3) are matched with the movable comb plate (1), and the lower ends thereof are fixed to the base below the movable comb plate (1).

2. The prestressed anti-warping mechanism of the comb plate telescopic device according to claim 1 is characterized in that A tooth plate pad (8) is provided on the upper surface of the base below the front of the movable comb plate (1) and the fixed comb plate (2); the exposed end of the anchor (5) connects and fixes the tooth plate pad (8) and the fixed comb plate (2); and a water stop (9) is provided at the joint of the expansion joint.

3. The prestressed anti-warping mechanism of the comb plate telescopic device according to claim 1 is characterized in that The lower end of the prestressed tension plate (6) is fixed to the base below the movable comb plate (1), and a gap is provided between the upper end of the prestressed tension plate (6) and the movable comb plate (1) and the prestressed tension plate (6) is connected via a third connecting member (6A).

4. The prestressed anti-warping mechanism of the comb plate telescopic device according to claim 1 is characterized in that The elastic element (3) is selected from rubber, polyurethane, spring or a combination thereof.

5. The prestressed anti-warping mechanism of the comb plate telescopic device according to claim 1 is characterized in that The pressure-bearing rubber support (4) is composed of rubber and thin steel plates which are horizontally distributed and longitudinally spaced inside the rubber.

6. The prestressed anti-warping mechanism of the comb plate telescopic device according to claim 1 is characterized in that The pressure-bearing rubber bearing (4) adopts an integrated structure, or a combination of at least two parallel-connected rubber bearings with different rigidities and heights.

7. The prestressed anti-warping mechanism of the comb plate telescopic device according to claim 6 is characterized in that The upper end of the pressure-bearing rubber support (4) is connected to the movable comb plate (1) via a second connecting member (4A).

8. The prestressed anti-warping tooth mechanism of the comb plate telescopic device according to any one of claims 1 to 7, characterized in that A bottom plate (7) is provided on the upper surface of the foundation below the rear portion of the movable comb plate (1) along the transverse direction. The bottom plate (7) is fastened and connected with L-shaped bolts (10) anchored in the foundation below it. The prestressed tension plate (6), the pressure-bearing rubber support (4) and the elastic element (3) are positioned and assembled with the bottom plate (7) through connecting components.

9. The prestressed anti-warping mechanism of the comb plate telescopic device according to claim 8, characterized in that The upper surface of the bottom plate (7) is provided with a top plate (7A) which is in an N-shape as a whole and is adapted to the elastic element (3) along the transverse bridge direction; a gap is provided between the upper surface of the top plate (7A) and the lower surface of the movable comb plate (1); the elastic element (3) is located inside the top plate (7A) and is connected to the movable comb plate (1) via a first connecting member (3A).

10. Application of the prestressed anti-warping tooth mechanism of the comb plate telescopic device according to any one of claims 1 to 9 in the comb plate telescopic device.

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