Automobile belt tensioner with fixing structure

Abstract

The invention relates to the technical field of automobile parts, in particular to an automobile belt tensioner with a fixing structure, which mainly comprises a mounting cylinder, a rocker arm arranged above the mounting cylinder, a hub arranged below the other end of the rocker arm and a tensioning mechanism, the tensioning mechanism is positioned below the rocker arm, and the tensioning mechanism comprises a torsional spring arranged in the mounting cylinder and a fixing mechanism. The fixing mechanism is located below the mounting cylinder. According to the belt tensioner, positioning is conducted through the arranged limiting shell and the positioning hole in the engine support, after the limiting shell drives the wedge-shaped block to move into the positioning hole, the wedge-shaped block and the positioning hole are clamped under the action of the elastic piece, and therefore the belt tensioner is limited and fixed, then the installation plate is further fixed through the gasket and the bolt, meanwhile, the gasket blocks the round frame, and the installation efficiency is improved. The wedge-shaped block can not be separated from the positioning hole, connection is more stable, the mounting hole in the mounting plate is aligned with the mounting hole in the engine frame, deviation is not prone to occurring, secondary positioning is not needed, and therefore the mounting time and efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, in particular to an automobile belt tensioner with a fixed structure. Background Art

[0002] The automotive belt tensioner (also called tensioner) is a key component in the automotive engine timing system. It is mainly used to adjust the tightness of the timing belt to ensure that the belt always maintains the best tension state. This can effectively prevent problems such as belt slippage, timing belt jumping or chain loosening and falling off, thereby maintaining the normal operation of the engine. At the same time, it can also reduce the wear of the sprocket and chain and extend their service life.

[0003] The Chinese patent publication number CN111120598B discloses an engine and a belt tensioner thereof, wherein the belt tensioner can meet the tensioning force required by the engine under high-speed and low-speed conditions. At the same time, when the engine is in a high-speed condition, the tensioning force provided by the belt tensioner is the same as or similar to the tensioning force required by the engine, thereby reducing the fuel consumption when the engine is in a high-speed condition and the tensioning arm assembly is in a small swing angle condition.

[0004] However, when installing the belt tensioner, the device needs to hold the belt tensioner to align the mounting hole on the base plate with the mounting hole on the engine frame, and then install the bolt in the mounting hole while holding the belt tensioner to fix the belt tensioner. Since the belt tensioner is installed while being manually aligned, it is easy to become skewed, so it is necessary to reposition the two mounting holes to align the two mounting holes for installation and fixation, which increases the installation time and reduces the efficiency. Summary of the invention

[0005] The object of the present invention is to provide an automotive belt tensioner with a fixing structure to solve the problems raised by the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An automobile belt tensioner with a fixed structure comprises: a mounting cylinder, a rocker arm is arranged above the mounting cylinder, and a wheel hub is arranged below the other end of the rocker arm;

[0008] A tensioning mechanism, the tensioning mechanism is located below the rocker arm, the tensioning mechanism includes a torsion spring arranged inside the mounting cylinder, a connecting sleeve is fixedly installed on the inner wall of the lower end of the mounting cylinder, and the tensioning mechanism is used to adjust the tension of the wheel hub;

[0009] The fixing mechanism is located below the mounting tube and comprises a limiting shell fixedly mounted on the bottom surface of the mounting tube, a movable plate is arranged inside the limiting shell, a wedge block is fixedly mounted on the side of the movable plate, and the fixing mechanism is used to fix the tensioner.

[0010] Preferably, the outer wall of the lower end of one side of the rocker arm is rotatably connected to the inner wall of the mounting tube, the lower end of the torsion spring is fixedly connected to the inner wall of the lower end of the mounting tube, and the upper end of the torsion spring is fixedly connected to the bottom surface of one end of the rocker arm.

[0011] Preferably, a bushing is movably installed on the inner wall of one side of the rocker arm, a pin is movably provided on the inner wall of the bushing, the outer wall of the lower end of the pin is threadedly connected to the inner wall of the connecting sleeve, and the pin positions the bushing and one end of the rocker arm.

[0012] Preferably, a rotating shaft is rotatably mounted on the bottom surface of the rocker arm on one side away from the mounting tube, a shaft sleeve is rotatably mounted on the outer wall of the rotating shaft, and the outer wall of the shaft sleeve is rotatably connected to the inner wall of the wheel hub.

[0013] Preferably, three movable plates and three wedge blocks are provided, and one end of the three wedge blocks away from the movable plates slides through the inner wall of the limiting shell and extends to the outside of the limiting shell, and the sides of the three movable plates away from the wedge blocks are respectively fixedly installed with hinge blocks.

[0014] Preferably, a round block is fixedly installed on the inner wall of the lower end of the mounting cylinder, and a plurality of sliding rods are fixedly installed on the outer wall of the round block. The other ends of the plurality of sliding rods slide through the sides of the plurality of movable plates and extend to the other side of the movable plates. The ends of the plurality of sliding rods away from the round block are fixedly connected to the inner wall of the limit shell.

[0015] Preferably, the inner walls of the multiple hinge blocks are respectively hinged with connecting rods, a disc is arranged above the multiple connecting rods, the outer wall of the disc is provided with multiple hinge grooves, and the ends of the multiple connecting rods away from the hinge blocks are respectively hinged to the inner walls of the multiple hinge grooves.

[0016] Preferably, a plurality of limit rods are slidably installed on the top surface of the disk, the lower ends of the plurality of limit rods are fixedly connected to the top surface of the round block, the upper ends of the plurality of limit rods are fixedly connected to the inner wall of the upper end of the limit shell, the outer walls of the plurality of limit rods are respectively slidably sleeved with elastic parts, the lower ends of the plurality of elastic parts are fixedly connected to the top surface of the disk, and the upper ends of the plurality of elastic parts are fixedly connected to the inner wall of the upper end of the limit shell.

[0017] Preferably, a fixing rod is fixedly installed on the top surface of the disc, two mounting plates are fixedly installed on the outer wall of the mounting tube, movable grooves are opened inside the mounting tube and on the top surfaces of the two mounting plates, a movable rod is slidably installed on the inner wall of the movable groove, the upper end of the fixing rod slides in turn through the upper inner wall of the limiting shell and the bottom surface of the mounting tube to extend into the movable groove, and the upper end of the fixing rod is fixedly connected to the bottom surface of the movable rod.

[0018] Preferably, the top surfaces of the two mounting plates are provided with circular grooves, the two circular grooves are connected with the movable grooves, circular frames are fixedly installed at both ends of the movable rod, and adjustment blocks are fixedly installed on the outer walls of the two circular frames. The outer walls of the two circular frames and the outer walls of the adjustment blocks are slidingly connected with the inner walls of the two circular grooves and the inner walls of the two adjustment grooves respectively, one end of the two adjustment blocks protrudes out of the adjustment grooves, and mounting holes are respectively provided on the top surfaces of the two mounting plates, and gaskets are movably installed on the top surfaces of the two mounting plates, and the bottom surfaces of the two gaskets are respectively abutted against the top surfaces of the two circular frames, and bolts are respectively arranged inside the two mounting holes.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention positions the positioning hole on the engine bracket by setting a limiting shell. After the limiting shell drives the wedge block to move into the positioning hole, the wedge block is engaged with the positioning hole under the action of the elastic member, thereby limiting and fixing the belt tensioner. Subsequently, the mounting plate is further fixed by the gasket and the bolt. At the same time, the gasket blocks the round frame, so that the wedge block will not be separated from the positioning hole, and the connection is more stable. The mounting hole on the mounting plate is aligned with the mounting hole on the engine bracket, and it is not easy to deviate. No secondary positioning is required, thereby improving the time efficiency of installation.

[0021] The torsion spring is set to apply elastic force to the rocker arm, and the rocker arm applies thrust to the rotating shaft, sleeve and hub. The hub is in close contact with the belt and the belt is tensioned. The belt always maintains the best tension state, and at the same time prevents the occurrence of problems such as belt slippage, timing belt jumping or chain loosening and falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a schematic bottom view of the three-dimensional structure of the present invention;

[0024] Figure 3 It is an exploded view of the three-dimensional structure of the torsion spring of the present invention;

[0025] Figure 4 It is a cross-sectional schematic diagram of the three-dimensional structure of the rocker arm of the present invention;

[0026] Figure 5 It is an exploded view of the three-dimensional structure of the moving rod of the present invention;

[0027] Figure 6 It is a cross-sectional schematic diagram of the three-dimensional structure of the limiting shell of the present invention;

[0028] Figure 7 It is a schematic cross-sectional view of the three-dimensional structure of the installation tube of the present invention;

[0029] Figure 8It is a schematic diagram of the three-dimensional structure of the disk of the present invention.

[0030] In the figure:

[0031] 1. Mounting cylinder; 101. Rocker arm; 102. Wheel hub;

[0032] 2. tensioning mechanism; 201. connecting sleeve; 202. bushing; 203. pin; 204. torsion spring; 205. rotating shaft; 206. bushing;

[0033] 3. Fixing mechanism; 301. Limiting shell; 302. Moving plate; 303. Wedge block; 304. Round block; 305. Sliding rod; 306. Disc; 307. Articulated groove; 308. Connecting rod; 309. Articulated block; 310. Limiting rod; 311. Elastic member; 312. Fixed rod; 313. Moving rod; 314. Moving groove; 315. Mounting plate; 316. Ring groove; 317. Adjusting groove; 318. Round frame; 319. Adjusting block; 320. Gasket; 321. Bolt. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0036] like Figure 1-Figure 8 As shown, the present application provides an automotive belt tensioner with a fixed structure, comprising: a mounting cylinder 1, a rocker arm 101 is arranged above the mounting cylinder 1, and a wheel hub 102 is arranged below the other end of the rocker arm 101;

[0037] A tensioning mechanism 2, the tensioning mechanism 2 is located below the rocker arm 101, the tensioning mechanism 2 includes a torsion spring 204 arranged inside the mounting tube 1, a connecting sleeve 201 is fixedly mounted on the inner wall of the lower end of the mounting tube 1, and the tensioning mechanism 2 is used to adjust the tension of the wheel hub 102;

[0038] Specifically, Figure 1-Figure 4 As shown, the outer wall of the lower end of one side of the rocker arm 101 is rotatably connected to the inner wall of the mounting tube 1, the lower end of the torsion spring 204 is fixedly connected to the inner wall of the lower end of the mounting tube 1, and the upper end of the torsion spring 204 is fixedly connected to the bottom surface of one end of the rocker arm 101.

[0039] In this embodiment, the torsion spring 204 is provided to apply elastic force to the rocker arm 101, so that the rocker arm 101 has a thrust.

[0040] Specifically, Figure 1-Figure 4 As shown, a bushing 202 is movably installed on the inner wall of one side of the rocker arm 101, and a pin 203 is movably provided on the inner wall of the bushing 202. The outer wall of the lower end of the pin 203 is threadedly connected to the inner wall of the connecting sleeve 201, and the pin 203 positions the bushing 202 and one end of the rocker arm 101.

[0041] In this embodiment: the rocker arm 101 is fixed by threading the outer wall of the lower end of the pin shaft 203 with the inner wall of the connecting sleeve 201, and the bushing 202 is provided to reduce the wear of the inner wall of the rocker arm 101.

[0042] Specifically, Figure 1-Figure 4 As shown, a rotating shaft 205 is rotatably mounted on the bottom surface of the rocker arm 101 away from the mounting tube 1 , a shaft sleeve 206 is rotatably mounted on the outer wall of the rotating shaft 205 , and the outer wall of the shaft sleeve 206 is rotatably connected to the inner wall of the wheel hub 102 .

[0043] In this embodiment, the hub 102 is provided to support and tension the belt, thereby preventing problems such as belt slippage, timing belt jumping, or chain loosening and falling off.

[0044] The fixing mechanism 3 is located below the mounting tube 1. The fixing mechanism 3 includes a limiting shell 301 fixedly mounted on the bottom surface of the mounting tube 1. A movable plate 302 is arranged inside the limiting shell 301. A wedge block 303 is fixedly mounted on the side of the movable plate 302. The fixing mechanism 3 is used to fix the tensioner.

[0045] Specifically, Figure 1-Figure 8 As shown, three movable plates 302 and wedge blocks 303 are provided, and one end of the three wedge blocks 303 away from the movable plate 302 slides through the inner wall of the limiting shell 301 and extends to the outside of the limiting shell 301, and the sides of the three movable plates 302 away from the wedge blocks 303 are respectively fixedly installed with hinge blocks 309.

[0046] In this embodiment, the wedge block 303 is engaged with the positioning hole on the engine frame to preliminarily position and fix the tensioner, so that the tensioner can be easily fixed again later.

[0047] Specifically, Figure 1-Figure 8As shown, a round block 304 is fixedly installed on the inner wall of the lower end of the mounting tube 1, and a plurality of sliding rods 305 are fixedly installed on the outer wall of the round block 304. The other ends of the plurality of sliding rods 305 slide through the sides of the plurality of movable plates 302 and extend to the other side of the movable plates 302. One end of the plurality of sliding rods 305 away from the round block 304 is fixedly connected to the inner wall of the limiting shell 301.

[0048] In this embodiment, the movable plate 302 is limited by the provided sliding rod 305, so that the movable plate 302 drives the wedge block 303 to move more smoothly, and ensures that the movable plate 302 and the wedge block 303 are not easily offset.

[0049] Specifically, Figure 1-Figure 8 As shown, the inner walls of the multiple hinge blocks 309 are respectively hinged with connecting rods 308, a disc 306 is arranged above the multiple connecting rods 308, and the outer wall of the disc 306 is provided with multiple hinge grooves 307, and the ends of the multiple connecting rods 308 away from the hinge blocks 309 are respectively hinged to the inner walls of the multiple hinge grooves 307.

[0050] In this embodiment: the disc 306 is provided to drive the connecting rod 308 to move through the hinge groove 307, and the connecting rod 308 drives the hinge block 309 and the movable plate 302 to move, thereby driving the wedge block 303 to move, and adjusting the position of the wedge block 303.

[0051] Specifically, Figure 1-Figure 8 As shown, a plurality of limit rods 310 are slidably installed on the top surface of the disk 306, the lower ends of the limit rods 310 are fixedly connected to the top surface of the round block 304, the upper ends of the limit rods 310 are fixedly connected to the upper inner wall of the limit shell 301, and the outer walls of the limit rods 310 are respectively slidably sleeved with elastic parts 311, the lower ends of the elastic parts 311 are fixedly connected to the top surface of the disk 306, and the upper ends of the elastic parts 311 are fixedly connected to the upper inner wall of the limit shell 301.

[0052] In this embodiment, the disc 306 is limited by the limiting rod 310 , and the elastic member 311 applies a downward elastic force to the disc 306 , so that the moving plate 302 and the wedge block 303 have a thrust toward the outside of the limiting shell 301 .

[0053] Specifically, Figure 1-Figure 8 As shown, a fixing rod 312 is fixedly installed on the top surface of the disk 306, and two mounting plates 315 are fixedly installed on the outer wall of the mounting tube 1. A movable groove 314 is opened inside the mounting tube 1 and on the top surfaces of the two mounting plates 315. A movable rod 313 is slidably installed on the inner wall of the movable groove 314. The upper end of the fixing rod 312 slides in sequence through the upper inner wall of the limiting shell 301 and the bottom surface of the mounting tube 1 to extend to the inside of the movable groove 314, and the upper end of the fixing rod 312 is fixedly connected to the bottom surface of the movable rod 313.

[0054] In this embodiment: the movable rod 313 is limited by the movable groove 314, and the movable rod 313 can move up and down on the inner wall of the movable groove 314. When the movable rod 313 moves, it drives the fixed rod 312 to move, and the fixed rod 312 drives the disc 306 to move, so that the wedge block 303 is adjusted.

[0055] Specifically, Figure 1-Figure 8 As shown, the top surfaces of the two mounting plates 315 are each provided with an annular groove 316, and the two annular grooves 316 are connected to the movable groove 314, and circular frames 318 are respectively fixedly installed at both ends of the movable rod 313, and adjusting blocks 319 are respectively fixedly installed on the outer walls of the two circular frames 318, and the outer walls of the two circular frames 318 and the outer walls of the adjusting blocks 319 are respectively slidably connected with the inner walls of the two annular grooves 316 and the inner walls of the two adjusting grooves 317, and one end of the two adjusting blocks 319 protrudes out of the adjusting groove 317, and mounting holes are respectively provided through the top surfaces of the two mounting plates 315, and gaskets 320 are respectively movably installed on the top surfaces of the two mounting plates 315, and the bottom surfaces of the two gaskets 320 are respectively abutted against the top surfaces of the two circular frames 318, and bolts 321 are respectively provided inside the two mounting holes.

[0056] In this embodiment: the circular frame 318 is abutted and limited by the set gasket 320, and the circular frame 318 is fixed in the ring groove 316, so as to further limit and fix the movable rod 313, and the mounting plate 315 is fixed to the engine frame by the bolt 321, and the bolt 321 fixes the gasket 320, so as to ensure that the circular frame 318 is fixed to the wedge block 303 through multiple transmission structures, and ensure that the wedge block 303 is tightly connected to the positioning hole on the engine frame and is not easy to fall off. The set adjustment block 319 can shrink the wedge block 303 into the limiting shell 301 by pulling the adjustment block 319 when the tensioner is removed, so as to remove the tensioner.

[0057] The specific solution is as follows: the limiting shell 301 is positioned with the positioning hole on the engine bracket. After the limiting shell 301 drives the wedge block 303 to move into the positioning hole, the wedge block 303 is engaged with the positioning hole under the action of the elastic member 311, thereby limiting and fixing the belt tensioner. Subsequently, the mounting plate 315 is further fixed by the gasket 320 and the bolt 321. The gasket 320 abuts against the circular frame 318 to fix the circular frame 318 in the ring groove 316, thereby further limiting and fixing the moving rod 313. The mounting plate 315 is fixed by the bolt 321. It is fixed on the engine frame, and the bolt 321 fixes the gasket 320 to ensure that the round frame 318 fixes the wedge block 303 through multiple transmission structures, ensuring that the wedge block 303 is tightly connected to the positioning hole on the engine frame and is not easy to fall off. The torsion spring 204 is set to apply elastic force to the rocker arm 101, and the rocker arm 101 applies thrust to the rotating shaft 205, the sleeve 206 and the hub 102. The hub 102 is in close contact with the belt and tensions the belt. The belt always maintains the best tension state, while preventing the occurrence of problems such as belt slippage, timing belt jumping or chain loosening and falling off.

[0058] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary; within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0059] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automotive belt tensioner with a fixed structure, comprising: A mounting tube (1), wherein a rocker arm (101) is disposed above the mounting tube (1), and a wheel hub (102) is disposed below the other end of the rocker arm (101), characterized in that: A tensioning mechanism (2), the tensioning mechanism (2) being located below the rocker arm (101), the tensioning mechanism (2) comprising a torsion spring (204) arranged inside the mounting tube (1), a connecting sleeve (201) being fixedly mounted on the inner wall of the lower end of the mounting tube (1), and the tensioning mechanism (2) being used to adjust the tension of the wheel hub (102); A fixing mechanism (3), the fixing mechanism (3) is located below the mounting tube (1), the fixing mechanism (3) comprises a limiting shell (301) fixedly mounted on the bottom surface of the mounting tube (1), a movable plate (302) is arranged inside the limiting shell (301), a wedge block (303) is fixedly mounted on the side of the movable plate (302), and the fixing mechanism (3) is used to fix the tensioner.

2. The automotive belt tensioner with a fixed structure according to claim 1, characterized in that: The outer wall of the lower end of one side of the rocker arm (101) is rotatably connected to the inner wall of the mounting tube (1), the lower end of the torsion spring (204) is fixedly connected to the inner wall of the lower end of the mounting tube (1), and the upper end of the torsion spring (204) is fixedly connected to the bottom surface of one end of the rocker arm (101).

3. The automotive belt tensioner with a fixed structure according to claim 2, characterized in that: A bushing (202) is movably mounted on the inner wall of one side of the rocker arm (101), a pin shaft (203) is movably arranged on the inner wall of the bushing (202), the outer wall of the lower end of the pin shaft (203) is threadedly connected to the inner wall of the connecting sleeve (201), and the pin shaft (203) positions the bushing (202) and one end of the rocker arm (101).

4. The automotive belt tensioner with a fixing structure according to claim 3, characterized in that: A rotating shaft (205) is rotatably mounted on the bottom surface of the rocker arm (101) at a side away from the mounting cylinder (1), a shaft sleeve (206) is rotatably mounted on the outer wall of the rotating shaft (205), and the outer wall of the shaft sleeve (206) is rotatably connected to the inner wall of the wheel hub (102).

5. The automotive belt tensioner with a fixing structure according to claim 1, characterized in that: The movable plates (302) and wedge blocks (303) are each provided in three numbers. One end of the three wedge blocks (303) away from the movable plates (302) slides through the inner wall of the limiting shell (301) and extends to the outside of the limiting shell (301). The sides of the three movable plates (302) away from the wedge blocks (303) are respectively fixedly installed with hinge blocks (309).

6. The automotive belt tensioner with a fixing structure according to claim 5, characterized in that: A round block (304) is fixedly mounted on the inner wall of the lower end of the mounting tube (1), and a plurality of sliding rods (305) are fixedly mounted on the outer wall of the round block (304). The other ends of the plurality of sliding rods (305) respectively slide through the side surfaces of the plurality of movable plates (302) and extend to the other side of the movable plates (302), and the ends of the plurality of sliding rods (305) away from the round block (304) are fixedly connected to the inner wall of the limiting shell (301).

7. The automotive belt tensioner with a fixing structure according to claim 6, characterized in that: The inner walls of the plurality of hinge blocks (309) are respectively hinged with connecting rods (308), a disc (306) is arranged above the plurality of connecting rods (308), the outer wall of the disc (306) is provided with a plurality of hinge grooves (307), and the ends of the plurality of connecting rods (308) away from the hinge blocks (309) are respectively hinged with the inner walls of the plurality of hinge grooves (307).

8. The automotive belt tensioner with a fixing structure according to claim 7, characterized in that: A plurality of limit rods (310) are slidably installed on the top surface of the disk (306), the lower ends of the limit rods (310) are fixedly connected to the top surface of the round block (304), the upper ends of the limit rods (310) are fixedly connected to the inner wall of the upper end of the limit shell (301), and the outer walls of the limit rods (310) are slidably sleeved with elastic parts (311), the lower ends of the elastic parts (311) are fixedly connected to the top surface of the disk (306), and the upper ends of the elastic parts (311) are fixedly connected to the inner wall of the upper end of the limit shell (301).

9. The automotive belt tensioner with a fixing structure according to claim 8, characterized in that: A fixing rod (312) is fixedly mounted on the top surface of the disc (306); two mounting plates (315) are fixedly mounted on the outer wall of the mounting tube (1); a movable groove (314) is provided inside the mounting tube (1) and on the top surfaces of the two mounting plates (315); a movable rod (313) is slidably mounted on the inner wall of the movable groove (314); the upper end of the fixing rod (312) slides sequentially through the inner wall of the upper end of the limiting shell (301) and the bottom surface of the mounting tube (1) to extend into the movable groove (314); the upper end of the fixing rod (312) is fixedly connected to the bottom surface of the movable rod (313).

10. The automotive belt tensioner with a fixing structure according to claim 9, characterized in that: The top surfaces of the two mounting plates (315) are each provided with a circular groove (316), the two circular grooves (316) are connected with the movable groove (314), circular frames (318) are respectively fixedly installed at both ends of the movable rod (313), the outer walls of the two circular frames (318) are respectively fixedly installed with adjustment blocks (319), the outer walls of the two circular frames (318) and the outer walls of the adjustment blocks (319) are respectively slidably connected with the inner walls of the two circular grooves (316) and the inner walls of the two adjustment grooves (317), one end of the two adjustment blocks (319) exceeds the adjustment groove (317), the top surfaces of the two mounting plates (315) are respectively provided with mounting holes, the top surfaces of the two mounting plates (315) are respectively movably provided with gaskets (320), the bottom surfaces of the two gaskets (320) are respectively in contact with the top surfaces of the two circular frames (318), and bolts (321) are respectively arranged inside the two mounting holes.

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