A device for testing the shear force and friction performance of helmets

Abstract

The present invention discloses a device for testing the shear force and friction performance of helmets, comprising a base, wherein a first support frame and a second support frame are provided on the top of the base, a buffer assembly is provided on the second support frame, a movable plate is provided on the buffer assembly, the tops of the first support frame and the second support frame are connected and fixed by a horizontal guide frame, a guide groove is provided on the top of the horizontal guide frame, a screw rod is provided in the middle of the guide groove, the other end of the screw rod extends through the inner wall of the guide groove and is connected to a servo motor, a movable plate is sleeved on the screw rod, a mounting groove is provided at the top center of the movable plate, and grooves are provided on both sides of the mounting groove. Beneficial effect: Through the design of the clamping mechanism, head molds of different sizes can be fixed on the rotating connector, thereby making the test device adaptable to helmets of different sizes, thereby improving the scope of application of the test device.

Description

Technical Field

[0001] The present invention relates to the technical field of helmets, and in particular to a device for testing the shear force and friction performance of helmets. Background Art

[0002] Cycling helmets are the most reliable protection for your life during cycling. Falling while cycling can cause serious damage to the head. Even if a cyclist is riding at a low speed along a smooth bike path, safety issues should not be ignored.

[0003] As cycling safety issues are gradually being taken seriously, helmets have gradually become one of the indispensable equipment for head protection. However, current helmet testing equipment is unable to test the wear resistance and shear resistance of helmets, which causes the helmets to slip sideways on bumpy roads and be severely worn when sliding due to falls.

[0004] Currently, no effective solutions have been proposed for the problems in related technologies. Summary of the Invention

[0005] In response to the problems in the related art, the present invention proposes a device for testing the shear force and friction performance of a helmet to overcome the above-mentioned technical problems existing in the existing related art.

[0006] To this end, the specific technical solutions adopted in the present invention are as follows:

[0007] A device for testing the shear force and friction performance of a helmet, comprising a base, a support frame 1 and a support frame 2 are provided on the top of the base, a buffer assembly is provided on the support frame 2, a movable plate is provided on the buffer assembly, the tops of the support frame 1 and the support frame 2 are connected and fixed by a horizontal guide frame, a guide groove is provided on the top of the horizontal guide frame, a screw rod 1 is provided in the middle of the guide groove, the other end of the screw rod 1 passes through the inner wall of the guide groove and is connected to a servo motor, a movable plate is sleeved on the screw rod 1, a mounting groove is provided at the top center of the movable plate, grooves are provided on both sides of the mounting groove, an electric push rod is provided at the bottom center of the groove, a splint is provided at the top output end of the electric push rod, and the horizontal guide The center of the side of the frame is provided with a storage groove, and a screw rod is provided in the middle of the storage groove, and a hand wheel is provided on the end of the screw rod. A movable frame is sleeved on the screw rod, and the end of the movable plate is movably connected to the bottom end of the movable frame. A limiting mechanism cooperating with the movable frame is provided at the opening of the storage groove. A rotating motor is provided on both sides of the end of the movable frame, and the output end of the rotating motor is provided with a rotating shaft. The two rotating shafts are connected and fixed to the rotating frame, and an adjusting frame and a cylinder are respectively provided in the middle of the rotating frame, and a rotating shaft is provided inside the other end of the adjusting frame, and a rotating connector is sleeved on the rotating shaft. The output end of the cylinder is movably connected to the end of the rotating connector, and the bottom end of the rotating connector is connected to the head mold through a clamping mechanism.

[0008] Preferably, the buffer assembly includes a movable hole opened in the middle of the second support frame, a buffer spring is provided at the top of the movable hole, a movable block is provided at the bottom end of the buffer spring, a movable rod is provided at the bottom end of the movable block, and the movable plate is sleeved on the end of the movable rod.

[0009] Preferably, the limiting mechanism includes a receiving groove located at the opening of the receiving groove, a movable rod 1 is movably connected to the inner wall of the receiving groove, the other end of the movable rod 1 is sleeved with a support rod 2, one end of the support rod 2 is provided with a tension spring, the other end of the tension spring is connected and fixed to the inner wall of the receiving groove, the other end of the support rod 2 is provided with a limiting rod, the outer surface of the side of the limiting rod is provided with a locking plate, and the outer surface of the horizontal guide frame and above the locking plate is provided with a limiting frame that cooperates with the limiting rod.

[0010] Preferably, the top of the movable frame is provided with a plurality of limit grooves cooperating with the limit rod and a lock buckle cooperating with the locking plate, and the plurality of the lock buckles and the plurality of the limit grooves are staggered, and the outer surface of the horizontal guide frame and the outer side of the limit frame are symmetrically provided with two protective plates.

[0011] Preferably, the clamping mechanism includes a placement groove located at the bottom center of the rotating connector, a supporting plate and a driving motor are provided on the top of the placement groove, a slide rail is provided on the supporting plate, a positioning groove is provided at the center of the slide rail, the end of the rotating connector is stuck in the positioning groove, a clamping block 1 and a clamping block 2 are respectively provided at both ends of the slide rail, and clamping grooves are provided on the opposite sides of the clamping block 1 and the clamping block 2, and the clamping groove is squeezed together with the outer surface of the end of the rotating connector.

[0012] Preferably, the clamping block 1 has two fixing rods symmetrically opened on one side close to the clamping block 2, the other end of the fixing rod passes through the clamping block 2 and is connected and fixed to the connecting plate, and a reset spring is sleeved on the outer surface of the fixing rod and located between the clamping block 1 and the clamping block 2.

[0013] Preferably, a pushing block is provided at the top output end of the driving motor, and the pushing block is located between the second clamping block and the connecting plate. Two arc edges are symmetrically provided on both sides of the outer surface of the pushing block.

[0014] Preferably, a protrusion is provided on the inner wall of the storage groove, and a sliding groove matching the protrusion is provided on the outer surface of the movable frame.

[0015] The beneficial effects of the present invention are:

[0016] Through the design of the clamping mechanism, head models of different sizes can be fixed on the rotating connector, so that the test device can adapt to helmets of different sizes, thereby improving the applicability of the test device;

[0017] Through the design of the movable rod 1, when the support rod 2 rotates to drive the limit rod to descend, the support rod 2 can rotate and move toward the limit frame, thereby making the rotation of the support rod 2 drive the limit rod to perform a vertical linear downward movement;

[0018] Through the design of the limiting mechanism, the end of the limiting rod can be clamped into the corresponding limiting groove on the mobile frame. At the same time, the locking plate is fixed to the mobile frame through the lock buckle, thereby limiting the mobile frame and improving the stability of the mobile frame.

[0019] The design of the tension spring provides power for resetting both the second support rod and the limit rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 2 is a schematic diagram of the overall structure of a device for testing the shear force and friction performance of a helmet according to an embodiment of the present invention;

[0022] Figure 2 2. It is a schematic diagram of a top view of a horizontal guide frame suitable for a helmet shear force and friction performance testing device according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the partial internal structure of a horizontal guide frame suitable for a helmet shear force and friction performance testing device according to an embodiment of the present invention;

[0024] Figure 4 2. It is an enlarged schematic diagram of the structure of point A of a device for testing the shear force and friction performance of a helmet according to an embodiment of the present invention;

[0025] Figure 5 The figure is a schematic diagram of the structure of a clamping mechanism suitable for a helmet shear force and friction performance testing device according to an embodiment of the present invention.

[0026] In the picture:

[0027] 1. Base; 2. Support frame 1; 3. Support frame 2; 4. Movable hole; 5. Buffer spring; 6. Movable block; 7. Movable plate; 8. Horizontal guide frame; 9. Guide slot; 10. Screw rod 1; 11. Servo motor; 12. Movable plate; 13. Mounting slot; 14. Clamp; 15. Storage slot; 16. Screw rod 2; 17. Hand wheel; 18. Movable frame; 19. Slide slot; 20. Limit slot; 21. Lock; 22. Storage slot; 23. Movable rod 1; 2 4. Support rod 2; 25. Limit rod; 26. Limit frame; 27. Locking plate; 28. Protective plate; 29. Rotating frame; 30. Adjusting frame; 31. Cylinder; 32. Rotating shaft; 33. Rotating connector; 34. Head mold; 35. Loading plate; 36. Clamping block 1; 37. Clamping block 2; 38. Fixed rod; 39. Connecting plate; 40. Return spring; 41. Clamping groove; 42. Positioning groove; 43. Drive motor; 44. Pushing block; 45. Arc edge. DETAILED DESCRIPTION

[0028] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention. They are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. By referring to these contents, ordinary technicians in this field should be able to understand other possible implementation methods and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0029] According to an embodiment of the present invention, a device for testing the shear force and friction performance of a helmet is provided.

[0030] Example 1, as Figure 1-5 As shown, a shear force and friction performance testing device for a helmet according to an embodiment of the present invention includes a base 1, a support frame 2 and a support frame 3 are provided on the top of the base 1, a buffer assembly is provided on the support frame 2 3, and a movable plate 7 is provided on the buffer assembly. The tops of the support frames 1 2 and 2 3 are connected and fixed by a horizontal guide frame 8, a guide groove 9 is provided on the top of the horizontal guide frame 8, a screw rod 10 is provided in the middle of the guide groove 9, the other end of the screw rod 10 passes through the inner wall of the guide groove 9 and is connected to the servo motor 11, a movable plate 12 is sleeved on the screw rod 10, a mounting groove 13 is provided at the top center of the movable plate 12, grooves are provided on both sides of the mounting groove 13, an electric push rod is provided at the bottom center of the groove, a splint 14 is provided at the top output end of the electric push rod, and the horizontal guide frame 8 is provided with a plurality of screw rods. A receiving groove 15 is provided at the center of the side, and a screw rod 2 16 is provided in the middle part of the receiving groove 15, and a hand wheel 17 is provided at the end of the screw rod 2 16. A movable frame 18 is sleeved on the screw rod 2 16, and the end of the movable plate 7 is movably connected to the bottom end of the movable frame 18. A limiting mechanism cooperating with the movable frame 18 is provided at the opening of the receiving groove 15, and a rotating motor is provided on both sides of the end of the movable frame 18. The output end of the rotating motor is provided with a rotating shaft, and the two rotating shafts are fixedly connected to the rotating frame 29. An adjusting frame 30 and a cylinder 31 are respectively provided in the middle of the rotating frame 29, and a rotating shaft 32 is provided inside the other end of the adjusting frame 30. A rotating connector 33 is sleeved on the rotating shaft 32, and the output end of the cylinder 31 is movably connected to the end of the rotating connector 33, and the bottom end of the rotating connector 33 is connected to the head mold 34 through a clamping mechanism.

[0031] Example 2, as Figure 1-5As shown, a shear force and friction performance testing device for a helmet according to an embodiment of the present invention includes a base 1, a support frame 2 and a support frame 3 are provided on the top of the base 1, a buffer assembly is provided on the support frame 2 3, and a movable plate 7 is provided on the buffer assembly. The tops of the support frame 2 and the support frame 2 3 are connected and fixed by a horizontal guide frame 8, and a guide groove 9 is provided on the top of the horizontal guide frame 8. A screw rod 10 is provided in the middle of the guide groove 9, and the other end of the screw rod 10 passes through the inner wall of the guide groove 9 and is connected to the servo motor 11. A movable plate 12 is sleeved on the screw rod 10, and a mounting groove 13 is provided at the top center of the movable plate 12. Grooves are provided on both sides of the mounting groove 13, and an electric push rod is provided at the bottom center of the groove. A splint 14 is provided at the top output end of the electric push rod, and a receiving groove 15 is provided at the side center of the horizontal guide frame 8. A screw rod 2 16 is provided in the middle of the receiving groove 15, and a hand wheel is provided at the end of the screw rod 2 16. 17. A movable frame 18 is sleeved on the screw rod 2 16, and the end of the movable plate 7 is movably connected to the bottom end of the movable frame 18. A limiting mechanism cooperating with the movable frame 18 is provided at the opening of the receiving slot 15. A rotating motor is provided on both sides of the end of the movable frame 18, and the output end of the rotating motor is provided with a rotating shaft. The two rotating shafts are fixedly connected to the rotating frame 29. An adjusting frame 30 and a cylinder 31 are respectively provided in the middle of the rotating frame 29. A rotating shaft 32 is provided inside the other end of the adjusting frame 30, and a rotating connector 33 is sleeved on the rotating shaft 32. The output end of the cylinder 31 is movably connected to the end of the rotating connector 33, and the bottom end of the rotating connector 33 is connected to the head mold 34 through a clamping mechanism. The buffer assembly includes a movable hole 4 opened in the middle of the support frame 2 3, a buffer spring 5 is provided at the top of the movable hole 4, a movable block 6 is provided at the bottom end of the buffer spring 5, and a movable rod is provided at the bottom end of the movable block 6. The end of the movable rod is sleeved with the movable plate 7. It is not difficult to see from the above design that, through the design of the buffer assembly, the support frame 2 3 , the movable plate 7 and the moving frame 18 form a stable triangular structure, thereby improving the stability of the moving frame 18 .

[0032] Example 3, as Figure 1-5As shown, according to an embodiment of the present invention, a device for testing the shear force and friction performance of a helmet includes a base 1, a support frame 2 and a support frame 3 are provided on the top of the base 1, a buffer assembly is provided on the support frame 2 3, and a movable plate 7 is provided on the buffer assembly. The tops of the support frames 1 2 and 2 3 are connected and fixed by a horizontal guide frame 8, a guide groove 9 is provided on the top of the horizontal guide frame 8, a screw rod 10 is provided in the middle of the guide groove 9, the other end of the screw rod 10 passes through the inner wall of the guide groove 9 and is connected to the servo motor 11, a movable plate 12 is sleeved on the screw rod 10, and a movable plate 12 is provided at the top center of the movable plate 12. There is a mounting groove 13, and grooves are provided on both sides of the mounting groove 13. An electric push rod is provided at the center of the bottom of the groove, and a splint 14 is provided at the top output end of the electric push rod. A receiving groove 15 is provided at the center of the side of the horizontal guide frame 8. A screw rod 2 16 is provided in the middle of the receiving groove 15, and a hand wheel 17 is provided at the end of the screw rod 2 16. A movable frame 18 is sleeved on the screw rod 2 16. The end of the movable plate 7 is movably connected to the bottom end of the movable frame 18. A limiting mechanism that cooperates with the movable frame 18 is provided at the opening of the receiving groove 15. A rotating motor is provided on both sides of the end of the movable frame 18, and a rotating shaft is provided at the output end of the rotating motor. The two rotating shafts are fixedly connected to the rotating frame 29, and an adjusting frame 30 and a cylinder 31 are respectively provided in the middle of the rotating frame 29. A rotating shaft 32 is provided inside the other end of the adjusting frame 30, and a rotating connecting member 33 is sleeved on the rotating shaft 32. The output end of the cylinder 31 is movably connected to the end of the rotating connecting member 33, and the bottom end of the rotating connecting member 33 is connected to the head mold 34 through a clamping mechanism. The limiting mechanism includes a receiving groove 22 located at the opening of the receiving groove 15, and a movable rod 1 23 is movably connected to the inner wall of the receiving groove 22. The other end of the movable rod 1 23 is sleeved with a support rod 24, and one end of the support rod 24 is provided with a tension spring. The other end of the tension spring is connected and fixed to the inner wall of the receiving groove. The other end of the support rod 24 is provided with a limit rod 25. The outer surface of the side of the limit rod 25 is provided with a locking plate 27. The outer surface of the horizontal guide frame 8 and above the locking plate 27 are provided with a limit frame 26 that cooperates with the limit rod 25. The top of the mobile frame 18 is provided with a plurality of limit grooves 20 that cooperate with the limit rod 25 and a lock 21 that cooperates with the locking plate 27. The plurality of locks 21 and the plurality of limit grooves 20 are arranged in an alternating manner. The outer surface of the horizontal guide frame 8 and the outer side of the limit frame 26 are symmetrically provided with two protective plates 28. It is not difficult to see from the above design that, through the design of the limit mechanism, the end of the limit rod 25 can be inserted into the corresponding limit groove 20 on the mobile frame 18. At the same time, the locking plate 27 is fixed to the mobile frame 18 by the lock 21, thereby limiting the mobile frame 18 and improving the stability of the mobile frame 18.

[0033] Example 4, as Figure 1-5As shown, a device for testing the shear force and friction performance of a helmet according to an embodiment of the present invention includes a base 1, a support frame 2 and a support frame 3 are provided on the top of the base 1, a buffer assembly is provided on the support frame 2 3, and a movable plate 7 is provided on the buffer assembly. The tops of the support frames 1 2 and 2 3 are connected and fixed by a horizontal guide frame 8, a guide groove 9 is provided on the top of the horizontal guide frame 8, a screw rod 10 is provided in the middle of the guide groove 9, the other end of the screw rod 10 passes through the inner wall of the guide groove 9 and is connected to the servo motor 11, a movable plate 12 is sleeved on the screw rod 10, a mounting groove 13 is provided at the top center of the movable plate 12, and two ends of the mounting groove 13 are provided. There are grooves on both sides, and an electric push rod is provided at the bottom center of the groove. The top output end of the electric push rod is provided with a splint 14. A receiving groove 15 is provided at the side center of the horizontal guide frame 8. A screw rod 2 16 is provided in the middle of the receiving groove 15. A hand wheel 17 is provided at the end of the screw rod 2 16. A movable frame 18 is sleeved on the screw rod 2 16. The end of the movable plate 7 is movably connected to the bottom end of the movable frame 18. A limiting mechanism that cooperates with the movable frame 18 is provided at the opening of the receiving groove 15. Rotating motors are provided on both sides of the end of the movable frame 18. The output end of the rotating motor is provided with a rotating shaft. The two rotating shafts are connected and fixed to the rotating frame 29. The middle of the rotating frame 29 is respectively provided with a There are an adjusting frame 30 and a cylinder 31, a rotating shaft 32 is provided inside the other end of the adjusting frame 30, a rotating connector 33 is sleeved on the rotating shaft 32, the output end of the cylinder 31 is movably connected to the end of the rotating connector 33, the bottom end of the rotating connector 33 is connected to the head mold 34 through a clamping mechanism, the clamping mechanism includes a placement slot located at the bottom center of the rotating connector 33, a supporting plate 35 and a driving motor 43 are provided at the top of the placement slot, a slide rail is provided on the supporting plate 35, a positioning slot 42 is provided at the center of the slide rail, the end of the rotating connector 33 is stuck in the positioning slot 42, a clamping block 36 and a clamping block 37 are provided at both ends of the slide rail, A clamping groove 41 is provided on the opposite side of 36 and the clamping block 2 37, and the clamping groove 41 is squeezed together with the outer surface of the end of the rotating connection member 33. The clamping block 1 36 is symmetrically provided with two fixing rods 38 on the side close to the clamping block 2 37. The other end of the fixing rod 38 passes through the clamping block 2 37 and is connected and fixed to the connecting plate 39. A return spring 40 is provided on the outer surface of the fixing rod 38 and is located between the clamping block 1 36 and the clamping block 2 37. A pushing block 44 is provided at the top output end of the driving motor 43. The pushing block 44 is located between the clamping block 2 37 and the connecting plate 39, and two arc edges 45 are symmetrically provided on both sides of the outer surface of the pushing block 44.It is not difficult to see from the above design that through the design of the clamping mechanism, head molds 35 of different sizes can be fixed on the rotating connector 33, so that the testing device can adapt to helmets of different sizes, thereby improving the applicability of the testing device.

[0034] Example 5, as Figure 1-5 As shown, a device for testing the shear force and friction performance of helmets according to an embodiment of the present invention includes a protrusion provided on the inner wall of the receiving slot 15, and a slide groove 19 provided on the outer surface of the movable frame 18 to cooperate with the protrusion. As can be seen from the above design, the protrusion and slide groove 19 not only improve the stability of the movable frame 18, but also limit its rotation.

[0035] In actual application, before the test, first, the head mold 34 that matches the test helmet is installed on the rotating connector 33 (that is, the end of the head mold 34 is inserted into the positioning groove 42 on the rotating connector 33, and then the driving motor 43 is started by the control switch. The driving motor 43 drives the pushing block 44 to rotate. While the pushing block 44 rotates, it pushes the clamping block 2 37 and the connecting plate 39 through the two arc edges 45. The clamping block 2 37 moves in the direction of the positioning groove 42, and the connecting plate 39 moves to the other side. While the connecting plate 39 moves, the clamping block 1 36 is driven to move in the direction of the positioning groove 42 through the fixing rod 38, thereby forming the clamping block 1 36 and the clamping block 2 37 both moving in the direction of the positioning groove 42 at the same time. While moving, the clamping block 1 36 and the clamping block 2 37 are both clamped with the head mold 3 through their respective clamping grooves 41. 4 are clamped together, thereby fixing the head mold 34 and the rotating connector 33 together), then, the test helmet is installed on the head mold 34, and then, according to the size of the test helmet and the position of the movable plate 12 in the guide groove 9, the extension length of the movable frame 18 is adjusted (that is, by rotating the hand wheel 17 to drive the screw rod 16 to rotate, the screw rod 16 drives the movable frame 18 to move horizontally through the thread action, so that the movement trajectory of the test helmet is adapted to the movable plate 12, and while the movable frame 18 moves horizontally, it pulls the movable plate 7, and the other end of the movable plate 7 moves in the movable hole 4, thereby driving the movable block 6 to squeeze the buffer spring 5, and the buffer spring 5 is gradually compressed. When the movable frame 18 is adjusted to the appropriate position, the support frame 2 3, the movable plate 7 and the movable frame 18 form a stable triangular structure. At this time, Figure 4As shown, the end of the support rod 24 is pressed down, and the end of the support rod 24 brings the limit rod 25 down. In this process, the movable rod 1 23 will swing clockwise in a small range in the direction of the limit frame 26, and the bottom end of the limit rod 25 brings the locking plate 27 down synchronously, and the end of the limit rod 25 is stuck in the corresponding limit groove 20 on the moving frame 18. At the same time, the locking plate 27 is fixed to the moving frame 18 by the lock buckle 21, thereby limiting the moving frame 18 and improving the stability of the moving frame 18). Then, the rotating frame 29 is rotated and adjusted from the inclined state to the vertical state by the rotating motor, so that the test helmet matches the sandpaper or shear plate on the moving plate 12. Then, the cylinder 31 is started, and the cylinder 31 quickly pushes the end of the rotating connector 33, so that the rotating connector 33 rotates, and the bottom end of the rotating connector 33 brings the test helmet to slide quickly from the sandpaper or shear plate on the moving plate 12 at a certain speed. The staff judges the friction performance of the helmet by testing the scratches on the helmet.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any 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. A device for testing the shear force and friction performance of a helmet, characterized in that: The invention comprises a base (1), wherein the top of the base (1) is provided with a support frame 1 (2) and a support frame 2 (3), the support frame 2 (3) is provided with a buffer assembly, the buffer assembly is provided with a movable plate (7), the tops of the support frame 1 (2) and the support frame 2 (3) are connected and fixed by a horizontal guide frame (8), the top of the horizontal guide frame (8) is provided with a guide groove (9), the middle part of the guide groove (9) is provided with a screw rod 1 (10), the other end of the screw rod 1 (10) passes through the inner wall of the guide groove (9) and is connected to the servo motor (11), the screw rod 1 (10) is sleeved with a movable plate (12), the top center of the movable plate (12) is provided with a mounting groove (13), both sides of the mounting groove (13) are provided with grooves, the bottom center of the groove is provided with an electric push rod, the top output end of the electric push rod is provided with a clamping plate (14), the side center of the horizontal guide frame (8) is provided with a receiving groove (15), the A second screw rod (16) is provided in the middle of the receiving groove (15), a hand wheel (17) is provided at the end of the second screw rod (16), a movable frame (18) is sleeved on the second screw rod (16), the end of the movable plate (7) is movably connected to the bottom end of the movable frame (18), a limiting mechanism matched with the movable frame (18) is provided at the opening of the receiving groove (15), a rotating motor is provided on both sides of the end of the movable frame (18), and a rotating motor is provided at the output end of the rotating motor. The rotating shaft is fixedly connected to the rotating frame (29), and the middle part of the rotating frame (29) is respectively provided with an adjusting frame (30) and a cylinder (31). The other end of the adjusting frame (30) is internally provided with a rotating shaft (32), and a rotating connecting piece (33) is sleeved on the rotating shaft (32). The output end of the cylinder (31) is movably connected to the end of the rotating connecting piece (33), and the bottom end of the rotating connecting piece (33) is connected to the head mold (34) through a clamping mechanism.

2. A device for testing the shear force and friction performance of a helmet according to claim 1, characterized in that: The buffer assembly comprises a movable hole (4) provided in the middle of the second support frame (3), a buffer spring (5) is provided at the top of the movable hole (4), a movable block (6) is provided at the bottom end of the buffer spring (5), a movable rod is provided at the bottom end of the movable block (6), and the end of the movable rod is sleeved with the movable plate (7).

3. A device for testing the shear force and friction performance of a helmet according to claim 1, characterized in that: The limiting mechanism includes a receiving groove (22) located at the opening of the receiving groove (15), a movable rod (23) is movably connected to the inner wall of the receiving groove (22), the other end of the movable rod (23) is sleeved with a support rod (24), one end of the support rod (24) is provided with a tension spring, the other end of the tension spring is connected and fixed to the inner wall of the receiving groove, the other end of the support rod (24) is provided with a limiting rod (25), the outer surface of the side of the limiting rod (25) is provided with a locking plate (27), and the outer surface of the horizontal guide frame (8) and located above the locking plate (27) is provided with a limiting frame (26) that matches the limiting rod (25).

4. A device for testing the shear force and friction performance of a helmet according to claim 3, characterized in that: The top of the movable frame (18) is provided with a plurality of limiting grooves (20) matched with the limiting rod (25) and a lock buckle (21) matched with the locking plate (27), and the plurality of lock buckles (21) and the plurality of limiting grooves (20) are arranged alternately. The outer surface of the horizontal guide frame (8) and located on the outer side of the limiting frame (26) are symmetrically provided with two protective plates (28).

5. A device for testing the shear force and friction performance of a helmet according to claim 1, characterized in that: The clamping mechanism includes a placement groove located at the bottom center of the rotating connection member (33), a supporting plate (35) and a driving motor (43) are provided at the top of the placement groove, a slide rail is provided on the supporting plate (35), a positioning groove (42) is provided at the center of the slide rail, the end of the rotating connection member (33) is clamped into the positioning groove (42), and a clamping block 1 (36) and a clamping block 2 (37) are provided at both ends of the slide rail, and a clamping groove (41) is provided on the opposite side of the clamping block 1 (36) and the clamping block 2 (37), and the clamping groove (41) and the outer surface of the end of the rotating connection member (33) are squeezed together.

6. A device for testing the shear force and friction performance of a helmet according to claim 5, characterized in that: Two fixing rods (38) are symmetrically provided on one side of the clamping block 1 (36) close to the clamping block 2 (37). The other end of the fixing rod (38) passes through the clamping block 2 (37) and is connected and fixed to the connecting plate (39). A return spring (40) is sleeved on the outer surface of the fixing rod (38) and is located between the clamping block 1 (36) and the clamping block 2 (37).

7. A device for testing the shear force and friction performance of a helmet according to claim 6, characterized in that: A pushing block (44) is provided at the top output end of the driving motor (43), and the pushing block (44) is located between the second clamping block (37) and the connecting plate (39). Two arc edges (45) are symmetrically provided on both sides of the outer surface of the pushing block (44).

8. The device for testing the shear force and friction performance of a helmet according to claim 1, characterized in that: A protrusion is provided on the inner wall of the receiving groove (15), and a sliding groove (19) matching the protrusion is provided on the outer surface of the movable frame (18).

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