Vehicle mechanical performance testing device

Abstract

The invention provides a vehicle mechanical performance testing device, which relates to the technical field of testing devices and comprises a testing piece, the testing piece is mounted at the bottom of a main body, an outer piece is arranged at the outer end of a connecting plate, a round hole is formed in the outer piece, a pull rod is mounted in the round hole and is of a T-shaped shaft structure, a push plate is arranged at the inner end of each pull rod, and the push plate is connected with the main body. The pushing plate is of an inverted-L-shaped plate-shaped structure, and the top end of the pushing plate is of an inclined structure. When the test piece moves downwards, the insertion head is driven to move downwards together, so that the insertion head can be stressed and displaced in the stress groove, the contact surface of the insertion head and the stress groove is of an inclined structure, the moving piece can transversely displace, the insertion piece is inserted above the pressing plate, the pressing plate is continuously pressed, and the device can avoid loosening by utilizing moving force; the service life is prolonged, and the problem that an existing mechanical property strength testing device lacks a structure for avoiding loosening by utilizing moving force is solved.

Description

Technical Field

[0001] The invention relates to the technical field of testing devices, and in particular to a vehicle mechanical performance testing device. Background Art

[0002] After the vehicle is manufactured, it is usually necessary to conduct mechanical performance tests on it. Mechanical performance tests usually include strength, stiffness, fatigue and functional tests. When testing the strength of the top of the vehicle, a testing device is required; However, as for the existing traditional mechanical property strength testing device, its test structure is prone to tilt during mobile testing, which can easily lead to inaccurate data, and there is a lack of structure for continuous force adjustment of the angle. At the same time, the test device is prone to vibration after multiple up and down movements, and vibration can easily cause parts to loosen. Therefore, the existing testing device lacks a structure to reduce looseness and a structure to use moving force to avoid loosening. Summary of the invention

[0003] In view of this, the present invention provides a vehicle mechanical performance testing device, which has a support groove, and a push rod can be inserted into the interior of the support groove, so that the push rod can be strengthened to support the effect, so that the bottom of the main body will not loosen after continuous vibration and impact.

[0004] The present invention provides a vehicle mechanical performance testing device, which specifically comprises: a main body; the main body is an inverted U-shaped structure, a T-shaped block is respectively arranged at the two ends of the bottom of the main body, a control box is arranged at the top of the main body, a control member is arranged at the side of the main body, a mounting member is respectively connected to the two ends of the bottom of the main body, and the top of each mounting member is provided with four symmetrical supporting grooves, the supporting groove is an L-shaped structure, and the bottom of the outer end of the supporting groove is an inclined structure; a moving member, the moving member is a rectangular structure, and there are two moving members in total, and the two moving members are respectively installed on both sides of the front end of the main body, and the outer end of each moving member is provided with a receiving Force groove, the force groove is an inclined structure; test piece, the test piece is a circular structure, the test piece is installed at the bottom of the main body, the top of the test piece is connected to the control box through a traction rope, the test piece is electrically connected to the control box through a line, two connecting plates are respectively provided on both sides of the test piece, the outer end of the connecting plate is provided with an outer part, the interior of the outer part is provided with a circular hole, a pull rod is installed inside the circular hole, the pull rod is a T-shaped shaft structure, a spring is mounted on the outside of the pull rod, a push plate is provided at the inner end of each pull rod, the push plate is an inverted L-shaped plate structure, the top of the push plate is an inclined structure, and the push plate is made of elastic metal.

[0005] Optionally, a slide groove is respectively provided inside both sides of the main body, the slide groove is a U-shaped structure, both ends of the slide groove are connected to the outside, a bottom piece is respectively provided at both ends of the bottom of the main body, the bottom piece is a rectangular structure, and a rectangular bin is provided at the bottom of the bottom piece; a movable groove is provided at the top of each of the bottom pieces, the movable groove is a T-shaped structure, a guide piece is provided above the outer end of each bottom piece, the guide piece is an I-shaped structure, the outer end of the guide piece is a rectangular structure, the middle position of the guide piece is a cylindrical structure, and a spring is mounted on the outer side of the guide piece; the mounting piece is an L-shaped structure, four rectangular grooves are provided at the top of each mounting piece, an auxiliary groove is provided at the top of each mounting piece, the auxiliary groove is a T-shaped structure, and a T-shaped block at the bottom of the main body is embedded in the inside of the auxiliary groove, and two fixing pieces are installed on the outside of each mounting piece, the fixing piece is an inverted U-shaped structure, the two ends of the fixing piece are wedge-shaped structures, and the outer end of the fixing piece is fixed to the ground by bolts.

[0006] Optionally, the inner end of each of the movable members is provided with two symmetrically arranged guide plates, which are L-shaped plate structures, embedded in the interior of the movable groove, and the outer end of the guide plate is provided with a circular hole, in which a guide member is inserted, and the inner end of each movable member is provided with a plug-in, and the inner end of the plug-in is a wedge-shaped structure; a pressure plate is installed inside the rectangular warehouse of the bottom member, and the pressure plate is a rectangular structure. The pressure plate is at the bottom of the inner end of the plug-in and the movable member, and four auxiliary rods are provided at the bottom of each pressure plate, and the auxiliary rods are a rectangular structure. The auxiliary rods are inserted into the rectangular groove of the mounting member; four push rods are provided at the bottom of each pressure plate, and the push rods are T-shaped structures. The outer ends of the push rods are wedge-shaped structures, and the bottoms of the push rods are inserted into the support grooves.

[0007] Optionally, the connecting plate is a rectangular plate structure, the outer part is a U-shaped structure, the outer part is inserted into the interior of the slide slot, and a square plate is provided on each side of the outer part, and the square plate is embedded in the two ends of the slide slot; a pushing wheel is installed inside the top end of each pushing plate through a rotating shaft, and the pushing wheel is a cylindrical structure; an auxiliary plate is provided at the front end of each outer part, and the auxiliary plate is an L-shaped plate structure; a pulling hole is provided inside each auxiliary plate, the middle position of the pulling hole is a cylindrical structure, and the outside of the pulling hole is a rectangular structure; a pressure rod is installed inside the pulling hole of each auxiliary plate, a circular plate is provided at the top end of the pressure rod, the middle position of the pressure rod is a cylindrical structure, the outer end of the pressure rod is a rectangular structure, a spring is mounted on the outer side of the pressure rod, and an insertion head is provided at the bottom of each pressure rod, and the insertion head is a wedge-shaped structure.

[0008] Beneficial Effects 1. Compared with the traditional testing device, the testing device of each embodiment of the present invention is provided with a stress groove, so that after the testing piece moves downward, the insertion head can be inserted into the inside of the stress groove to displace the moving piece, thereby preventing the device from loosening.

[0009] 2. By setting the pull rod and the push plate, when the device is in use, the spring on the outside of the pull rod can be continuously stretched by force, and the push plate can use its own elasticity to continuously control the rotation of the push wheel, so that the push wheel can continuously contact the inner side of the main body, so that when the test piece moves downward for testing, the four push wheels can be pushed at the same time, thereby effectively applying force to the test piece, so that the test piece can always remain in a horizontal state and move downward for testing, so that the test data can be more accurate; 3. By setting the support groove, when the device is in use, the inside of the support groove can fit the push rod, so that the push rod can be continuously supported by force, thereby continuously strengthening the support and fixing effect of the main body, so that after the test piece is continuously displaced for testing, the bottom of the main body can be effectively prevented from loosening, so that the main body can be stably installed and used, and the test data can be avoided; 4. By setting the force groove, when the test piece moves downward, it can drive the insertion head to move downward together, so that the insertion head can be displaced by force inside the force groove. Since the contact surface between the insertion head and the force groove is an inclined structure, the longitudinal power can be converted into lateral power, so that the moving part can be displaced laterally, the plug-in can be inserted above the pressure plate, and the pressure plate can be continuously pressed, so that the device can use the moving force to avoid the device from loosening and improve the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0011] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0012] In the attached picture: Figure 1 A schematic diagram showing a three-dimensional structure of a testing device according to an embodiment of the present invention; Figure 2 A schematic diagram showing a bottom-up structure of a testing device according to an embodiment of the present invention is shown; Figure 3 A schematic diagram showing an exploded three-dimensional structure of a testing device according to an embodiment of the present invention is shown; Figure 4 A schematic diagram showing an exploded bottom view structure of a testing device according to an embodiment of the present invention is shown; Figure 5 A schematic diagram showing a main body exploded stereoscopic structure and a partial enlarged structure of a testing device according to an embodiment of the present invention is shown; Figure 6 A schematic diagram showing an exploded three-dimensional structure of a moving part of a testing device according to an embodiment of the present invention is shown; Figure 7A schematic diagram showing an exploded three-dimensional structure of a test piece of a test device according to an embodiment of the present invention is shown; Figure 8 A schematic diagram showing an exploded bottom view structure of a test piece of a test device according to an embodiment of the present invention is shown.

[0013] Reference numerals list 1. Main body; 101. Slide groove; 102. Bottom piece; 103. Moving groove; 104. Guide piece; 105. Mounting piece; 106. Auxiliary groove; 107. Support groove; 108. Fixing piece; 2. Moving part; 201. Force groove; 202. Guide plate; 203. Plug-in; 204. Press plate; 205. Auxiliary rod; 206. Push rod; 3. Test piece; 301. Connecting plate; 302. External piece; 303. Pull rod; 304. Push plate; 305. Push wheel; 306. Auxiliary plate; 307. Press rod; 308. Insertion head. DETAILED DESCRIPTION

[0014] In order to make the purpose, scheme and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the usual meanings in the art. The same reference numerals in the drawings represent the same components.

[0015] Example: Please refer to Figures 1 to 8 : The present invention proposes a vehicle mechanical performance testing device, including a main body 1; the main body 1 is an inverted U-shaped structure, so that the vehicle can be moved to the bottom of the main body 1 for testing, and a T-shaped block is respectively provided at both ends of the bottom of the main body 1, which is used to be embedded in the inside of the auxiliary groove 106, so that the mounting member 105 can be guided to move, so that the main body 1 can be conveniently disassembled and maintained, a control box is provided at the top of the main body 1, and a control member is provided on the side of the main body 1, which can conveniently control the test piece 3 for testing, and a mounting member 105 is respectively connected to the two ends of the bottom of the main body 1, and each mounting member 105 is provided with four symmetrical support grooves 107 at the top, and the support grooves 107 The outer end of the support groove 107 is an L-shaped structure, and the bottom of the outer end of the support groove 107 is an inclined structure, which is used to contact the bottom end of the push rod 206 and the outside to bear force, thereby strengthening the supporting effect; the moving member 2 is a rectangular structure, and there are two moving members 2. The two moving members 2 are respectively installed on both sides of the front end of the main body 1, and can be moved on both sides of the front end of the main body 1 for use. The outer end of each moving member 2 is provided with a force groove 201, and the force groove 201 is an inclined structure. After the test piece 3 moves downward, the insertion head 308 can be inserted into the inside of the force groove 201, so that the moving member 2 can be displaced laterally, so that the plug-in 203 can be inserted into the pressure The top of the plate 204 can be fixed to prevent the bottom of the main body 1 from loosening; the test piece 3 is a circular structure, the test piece 3 is installed at the bottom of the main body 1, and the top of the test piece 3 is connected to the control box through a traction rope, so that the control box can control the movement of the traction rope, so that the test piece 3 can be moved for testing. The test piece 3 is electrically connected to the control box through a line so that the test data can be accurately transmitted. Two connecting plates 301 are respectively provided on both sides of the test piece 3, and an outer piece 302 is provided at the outer end of the connecting plate 301. A round hole is provided inside the outer piece 302, and a pull rod 303 is installed inside the round hole. The rod 303 is a T-shaped shaft structure, and a spring is installed on the outer side of the pull rod 303, so that the spring can be continuously stretched under force, thereby continuously controlling the movement of the push plate 304. A push plate 304 is provided at the inner end of each pull rod 303. The push plate 304 is an inverted L-shaped plate structure, and the top of the push plate 304 is an inclined structure. The push plate 304 is made of elastic metal material, so that the push plate 304 can be stressed together with the elasticity of the spring, thereby continuously controlling the displacement of the push wheel 305, so that the push wheel 305 can continuously contact the inner side of the main body 1, thereby continuously controlling the test piece 3 to be in a horizontal state for testing, thereby improving the accuracy of the test data.

[0016] refer to Figure 5A slide groove 101 is provided inside each side of the main body 1. The slide groove 101 is a U-shaped structure, which is used to guide the displacement of the external part 302 inside it, so that the test piece 3 can be assisted in controlling the guided displacement. The two ends of the slide groove 101 are connected to the outside. A bottom piece 102 is provided at each end of the bottom of the main body 1. The bottom piece 102 is a rectangular structure. A rectangular bin is provided at the bottom of the bottom piece 102, so that the pressure plate 204 can move inside it; a moving groove 103 is provided at the top of each bottom piece 102. The moving groove 103 is a T-shaped structure, so that the guide plate 202 can be guided and displaced inside it. A guide piece 104 is provided above the outer end of each bottom piece 102. The guide piece 104 is an I-shaped structure. The outer end of the guide piece 104 is a rectangular structure. The middle position of the guide piece 104 is a cylindrical structure, which is inserted into the circular hole of the guide plate 202 for guiding displacement. A spring is sleeved on the outer side of the guide member 104, so that the spring can push the guide plate 202 and the movable member 2 to guide the displacement; the mounting member 105 is an L-shaped structure, which is used to support the installation of the main body 1. Four rectangular grooves are provided on the top of each mounting member 105, and an auxiliary groove 106 is provided on the top of each mounting member 105. The auxiliary groove 106 is a T-shaped structure, and a T-shaped block at the bottom of the main body 1 is embedded in the auxiliary groove 106, so that the mounting member 105 can be displaced laterally at the bottom of the main body 1, so that the mounting member 105 can be detached from the inside of the fixing member 108, so that the main body 1 can be easily disassembled for maintenance, and two fixing members 108 are installed on the outside of each mounting member 105. The fixing member 108 is an inverted U-shaped structure, and the two ends of the fixing member 108 are wedge-shaped structures. The outer end of the fixing member 108 is fixed to the ground by bolts to assist in fixing the mounting member 105 and the main body 1.

[0017] refer to Figure 6, the inner end of each moving part 2 is provided with two symmetrically arranged guide plates 202, the guide plates 202 are L-shaped plate structures, the guide plates 202 are embedded in the inside of the moving groove 103, and are used to control the guiding displacement of the moving part 2, and the outer end of the guide plate 202 is provided with a circular hole, and the inside of the circular hole is inserted with a guide member 104, so that the guide plate 202 can be guided to move, so that the spring outside the guide member 104 can push the moving part 2 to reset, and the inner end of each moving part 2 is provided with a plug-in 203, and the inner end of the plug-in 203 is a wedge-shaped structure, so that after the moving part 2 is displaced by force, the plug-in 203 can be inserted into the inside of the rectangular bin, and then the pressing plate 204 is pushed, so that when the device is tested, the strength can be temporarily strengthened to avoid loosening; a pressing plate 20 is installed inside the rectangular bin of the bottom part 102 4. The pressing plate 204 is a rectangular structure, which is used to drive the auxiliary rod 205 to guide the displacement. The pressing plate 204 is at the bottom of the inner end of the plug-in 203 and the moving part 2. Four auxiliary rods 205 are arranged at the bottom of each pressing plate 204. The auxiliary rods 205 are rectangular structures. The auxiliary rods 205 are inserted into the rectangular grooves of the mounting parts 105, which can play a supporting and connecting role, and can also play a role in fixing the mounting parts 105; four push rods 206 are arranged at the bottom of each pressing plate 204. The push rods 206 are T-shaped structures, and the outer ends of the push rods 206 are wedge-shaped structures. The bottoms of the push rods 206 are inserted into the supporting grooves 107, and can be in the supporting grooves 107 for continuous support, thereby improving stability and avoiding looseness and shaking.

[0018] refer to Figure 7 and Figure 8The connecting plate 301 is a rectangular plate structure, which is used to support and install the external part 302. The external part 302 is a U-shaped structure. The external part 302 is inserted into the inside of the slide groove 101. A square plate is provided on both sides of the external part 302, and the square plate is embedded in the two ends of the slide groove 101, so that the external part 302 can assist in controlling the guided displacement of the test piece 3; a pushing wheel 305 is installed inside the top of each pushing plate 304 through a rotating shaft. The pushing wheel 305 is a cylindrical structure, so that the pushing wheel 305 can be continuously pushed, and then continuously support the test piece 3, so that the test piece 3 can effectively guide and move horizontally, and an auxiliary plate 306 is provided at the front end of each external part 302. The auxiliary plate 306 is an L-shaped plate structure, which is used to support A pressure rod 307 is installed on the support, and a pulling hole is provided inside each auxiliary plate 306. The middle position of the pulling hole is a cylindrical structure, and the outside of the pulling hole is a rectangular structure, which is used to guide the pressure rod 307 to move without rotating; a pressure rod 307 is installed inside the pulling hole of each auxiliary plate 306, and a circular plate is provided on the top of the pressure rod 307, the middle position of the pressure rod 307 is a cylindrical structure, and the outer end of the pressure rod 307 is a rectangular structure. A spring is mounted on the outer side of the pressure rod 307, so that the pressure rod 307 can use the spring to adaptively adjust the position, and an insertion head 308 is provided at the bottom of each pressure rod 307. The insertion head 308 is a wedge-shaped structure, which is used to be inserted into the inside of the force-bearing groove 201, so that the movable part 2 can be force-guided displacement.

[0019] Specific usage and function of this embodiment: In the present invention, when it is necessary to use the device, the fixing member 108 can be controlled to limit and fix first, and then the pressure plate 204 can be pulled up, and then the main body 1 can be controlled to be installed between the fixing members 108, and then the installation member 105 can be pushed to move outward, and then the pressure plate 204 can be released, so that the auxiliary rod 205 can be inserted into the rectangular groove, and the pushing rod 206 can be inserted into the supporting groove 107 for internal support, thereby improving the supporting effect on the main body 1 and preventing the main body 1 from loosening after continuous use, and then the vehicle can be controlled to move to the bottom of the main body 1, so that the bottom of the test piece 3 can accurately reach the top of the vehicle to be tested, and then the control member can be used to control the test piece 3 to move downward, so that after the test piece 3 moves downward, the pull rod 303 can continue to receive the spring power displacement, and at the same time, the pushing plate 304 can use its own elasticity to continuously control the pushing wheel 305, so that The pushing wheel 305 can continuously contact the inner side of the main body 1, so that the test piece 3 can be controlled, so that the test piece 3 can always be in a horizontal state and move downward, thereby improving the accuracy of the test, and the bottom of the test piece 3 can contact the top of the vehicle, thereby testing the mechanical performance strength of the vehicle. When the test piece 3 moves downward, it can drive the insertion head 308 to move downward together, so that the insertion head 308 can be inserted into the inside of the force groove 201 at the same time, so that the moving part 2 can be forced to move laterally, and the plug-in 203 can be inserted above the pressure plate 204, so that the pressure plate 204 can be supported and fixed, so that the pressure plate 204 can be firmly installed to prevent the pressure plate 204 from loosening, so that the bottom of the main body 1 can strengthen the fixing effect, so that the device can use the moving force to prevent the bottom of the main body 1 from loosening, so that the main body 1 can increase the service life, and the test piece 3 can accurately test the mechanical performance of the vehicle.

[0020] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. A vehicle mechanical performance testing device, comprising a main body (1); characterized in that: The main body (1) is an inverted U-shaped structure, a T-shaped block is provided at each of the two ends of the bottom of the main body (1), a control box is provided at the top of the main body (1), a control member is provided at the side of the main body (1), a mounting member (105) is connected to each of the two ends of the bottom of the main body (1), four symmetrical supporting grooves (107) are provided at the top of each mounting member (105), and the bottom of the outer end of the supporting groove (107) is an inclined structure; A moving member (2), wherein two moving members (2) are provided in total, and the two moving members (2) are respectively mounted on both sides of the front end of the main body (1), and a force-bearing groove (201) is provided at the outer end of each moving member (2), and the force-bearing groove (201) is an inclined structure; A test piece (3), wherein the test piece (3) is installed at the bottom of the main body (1), the top of the test piece (3) is connected to the control box via a traction rope, the test piece (3) is electrically connected to the control box via a line, two connecting plates (301) are respectively provided on both sides of the test piece (3), an outer piece (302) is provided at the outer end of the connecting plate (301), a circular hole is provided inside the outer piece (302), a pull rod (303) is installed inside the circular hole, the pull rod (303) is a T-shaped shaft structure, a spring is sleeved on the outer side of the pull rod (303), a push plate (304) is provided at the inner end of each pull rod (303), the push plate (304) is an inverted L-shaped plate structure, the top of the push plate (304) is an inclined structure, and the push plate (304) is made of elastic metal.

2. A vehicle mechanical performance testing device as claimed in claim 1, characterized in that: A slide groove (101) is provided inside each of the two sides of the main body (1), and both ends of the slide groove (101) are connected to the outside. A bottom piece (102) is provided at each of the two ends of the bottom of the main body (1), and a rectangular bin is provided at the bottom of the bottom piece (102).

3. A vehicle mechanical performance testing device as claimed in claim 2, characterized in that: A moving groove (103) is provided at the top of each bottom piece (102), a guide piece (104) is provided above the outer end of each bottom piece (102), the outer end of the guide piece (104) is a rectangular structure, the middle position of the guide piece (104) is a cylindrical structure, and a spring is sleeved on the outer side of the guide piece (104).

4. A vehicle mechanical performance testing device as claimed in claim 3, characterized in that: The mounting member (105) is an L-shaped structure, and four rectangular grooves are arranged at the top of each mounting member (105). An auxiliary groove (106) is arranged at the top of each mounting member (105), and the auxiliary groove (106) is a T-shaped structure. A T-shaped block at the bottom of the main body (1) is embedded inside the auxiliary groove (106). Two fixing members (108) are installed outside each mounting member (105), and both ends of the fixing member (108) are wedge-shaped structures. The outer ends of the fixing members (108) are fixed to the ground by bolts.

5. A vehicle mechanical performance testing device as claimed in claim 4, characterized in that: The inner end of each moving member (2) is provided with two symmetrically arranged guide plates (202), the guide plates (202) are embedded in the moving groove (103), the outer end of the guide plates (202) is provided with a circular hole, the inside of which is inserted a guide member (104), and the inner end of each moving member (2) is provided with an insert (203), the inner end of the insert (203) being a wedge-shaped structure.

6. A vehicle mechanical performance testing device as claimed in claim 5, characterized in that: A pressing plate (204) is installed inside the rectangular bin of the bottom member (102), the pressing plate (204) is located at the bottom of the inner end of the plug-in unit (203) and the moving member (2), and four auxiliary rods (205) are provided at the bottom of each pressing plate (204), and the auxiliary rods (205) are inserted into the rectangular groove of the mounting member (105).

7. A vehicle mechanical performance testing device as claimed in claim 6, characterized in that: Four push rods (206) are provided at the bottom of each of the pressing plates (204), the outer ends of the push rods (206) are wedge-shaped structures, and the bottoms of the push rods (206) are inserted into the interior of the support grooves (107).

8. A vehicle mechanical performance testing device as claimed in claim 2, characterized in that: The connecting plate (301) is a rectangular plate-shaped structure, the outer member (302) is inserted into the interior of the slide groove (101), and a square plate is provided on each side of the outer member (302), and the square plates are embedded in the interior of both ends of the slide groove (101).

9. A vehicle mechanical performance testing device as claimed in claim 8, characterized in that: A driving wheel (305) is installed inside the top end of each driving plate (304) via a rotating shaft, an auxiliary plate (306) is provided at the front end of each outer member (302), and a pulling hole is provided inside each auxiliary plate (306), the middle position of the pulling hole is a cylindrical structure, and the outside of the pulling hole is a rectangular structure.

10. A vehicle mechanical performance testing device as claimed in claim 9, characterized in that: A pressure rod (307) is installed inside the pulling hole of each auxiliary plate (306), a round plate is provided at the top of the pressure rod (307), the middle position of the pressure rod (307) is a cylindrical structure, the outer end of the pressure rod (307) is a rectangular structure, a spring is sleeved on the outer side of the pressure rod (307), and an insertion head (308) is provided at the bottom of each pressure rod (307), and the insertion head (308) is a wedge-shaped structure.

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