Free falling body device with automatic homing function

Abstract

The utility model discloses a free falling body device with an automatic homing function, which belongs to the technical field of falling test equipment and comprises a test board, a fixed bottom plate fixedly mounted on the test board and a test turntable rotationally mounted on the test board. The connecting frame has two axial rotational degrees of freedom through the rotating shaft I and the rotating shaft II; an angle adjusting assembly, an automatic homing assembly, a spring pushing assembly, an auxiliary jacking assembly and a holding rotating assembly are arranged on the test bench; and an encoder connected with the rotating shaft I is arranged on the bracket. Through the above mode, the free falling body rod is pushed by the spring pushing assembly to fall on the test rotating disc in a free falling body mode, and the free falling body rod can have an instantaneous speed of seven meters per second; the free falling body rod can rotate in the Y direction along with the rotation of the test rotating disc when making contact with the test rotating disc, the falling condition of the product under the moving condition is simulated, and the free falling body rod can automatically return to the standard position through the automatic returning assembly before the next falling test.

Description

Technical Field

[0001] The utility model relates to the technical field of drop test equipment, in particular to a free fall device with automatic return. Background Art

[0002] With the advancement of technology, smart watches have gradually entered people's lives. Smart watches need to be sampled and inspected before they are finally shipped out to test whether their anti-fall, waterproof and other performance meet the design requirements.

[0003] Chinese patent CN117554016A discloses a drop test device and a test method for a USB flash drive. The drop test device uses a drop assembly to complete the free fall test of the USB flash drive and the drop test at a certain initial velocity. The drive assembly and the transmission assembly work to drive the rotating assembly to work, and the rotating assembly adjusts the angle of the drop assembly, thereby controlling the USB flash drive to complete the drop test at different angles.

[0004] However, existing drop test devices generally achieve free fall of products by throwing them, which requires a large test space to obtain the required instantaneous speed when falling, and the products need to be collected again before they can be tested again. The test efficiency is low, and it is difficult to meet the drop test requirements for different parts of the product.

[0005] Based on this, the utility model designs a free-fall device with automatic homing to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a free-fall device with automatic return.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A free-fall device with automatic homing comprises a test bench, a fixed base plate fixedly mounted on the test bench, and a test turntable rotatably mounted on the test bench;

[0009] The fixed bottom plate is fixedly mounted with a vertical plate and a bracket, the top of the vertical plate is fixedly mounted with a fixed frame, the bracket is rotatably connected to the first rotating shaft through a bearing; a connecting block is fixedly mounted on the vertical plate, the second rotating shaft is rotatably connected to the connecting block through a bearing, and the second rotating shaft is fixedly connected to the inner wall of the connecting frame; the connecting frame has two axial rotational degrees of freedom through the first rotating shaft and the second rotating shaft;

[0010] An angle adjustment assembly is provided at one end of the connecting frame close to the test turntable, a free-fall rod is fixedly installed at the movable end of the angle adjustment assembly, and a guide rod is fixedly installed at the other end of the connecting frame; the end of the free-fall rod is used to support and fix the product; an automatic return assembly cooperating with the free-fall rod is provided on the test bench, which is used to control the free-fall rod to return to the standard position; a spring push assembly is provided on the fixed frame, which is used to adjust the falling speed of the free-fall rod; the test bench is also provided with an auxiliary lifting assembly and a clamping rotation assembly, the output end of the clamping rotation assembly is connected to the rotating shaft 1, which is used to control the rotation of the rotating shaft 1 to lift the free-fall rod; the auxiliary lifting assembly is located on the front side of the connecting frame, which is used to assist the rotation of the connecting frame;

[0011] The bracket is provided with an encoder connected to the rotating shaft one, which is used to read the rotation parameters of the rotating shaft one.

[0012] Furthermore, the automatic homing assembly includes a guide block, a V-shaped guide groove and an electric cylinder. The electric cylinder is fixedly mounted on the lower side of the test bench. The output end of the electric cylinder is fixedly mounted with a guide block, and a V-shaped guide groove is provided on the guide block.

[0013] Furthermore, the bottom of the V-shaped guide groove is tilted to cooperate with the rotation of the connecting frame in the Y direction.

[0014] Furthermore, the clamping and rotating assembly includes a fixed plate, a servo motor, a synchronous belt transmission structure, an RV reducer and a pneumatic clutch. The fixed plate is fixedly connected to the test bench, the servo motor and the RV reducer are fixedly connected to the fixed plate, the output end of the servo motor is transmission-connected to the input end of the RV reducer through the synchronous belt transmission structure, and the output end of the RV reducer is connected to the rotating shaft through the pneumatic clutch.

[0015] Furthermore, the auxiliary lifting assembly includes a lifting cylinder and a roller. The lifting cylinder is fixedly installed at the lower end of the test bench. The output end of the lifting cylinder is fixedly connected to the lifting plate through a guide structure. The lifting plate is rotatably connected to the roller through a bearing.

[0016] Furthermore, the spring pushing assembly includes a fixed block, a sliding rod, a compression spring and a pushing plate. The fixed block is fixedly connected to the fixed frame. The sliding rods are symmetrically fixedly installed at both ends of the fixed block. The pushing plate is slidably connected to the sliding rod through a linear bearing.

[0017] Furthermore, the angle adjustment assembly includes a rotating dial, a gear plate and a locking assembly, the rotating dial is fixedly connected to the connecting frame; the gear plate is rotationally connected to the rotating dial through a bearing and is fixedly connected to the free fall rod; a locking assembly for locking the gear plate position is provided on the connecting frame.

[0018] Furthermore, the locking assembly includes a locking pin and a fixing seat, the fixing seat is fixedly connected to the connecting frame, and the fixing seat is provided with a locking pin that engages with the teeth of the toothed disc.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] In the utility model, the free fall rod is controlled to rotate in the X direction by holding the rotating assembly, the spring push assembly is used to provide an initial thrust for the free fall of the free fall rod, and the initial thrust is controlled by adjusting different compression amounts of the spring push assembly, so that the free fall rod can have different initial velocities when released;

[0021] After holding the rotating assembly and releasing the rotating shaft, the free-fall rod falls on the test turntable in a free-fall manner under the push of the spring push assembly, so that the product on the free-fall rod can have an instantaneous speed of seven meters per second when it contacts the test turntable, meeting the drop test requirements for the product;

[0022] By directly turning the test turntable or controlling the test turntable to rotate through the servo motor drive structure, and adjusting the automatic return component when the free fall rod is in free fall, so that it loses the control effect on the free fall rod, the free fall rod can rotate freely in the Y direction, so that when the free fall rod contacts the test turntable, it will rotate in the Y direction with the rotation of the test turntable, simulating the falling of the product in the moving state, and by adjusting the rotation speed of the test turntable, the drop test requirements of the product in different scenarios can be met; before the next drop test, the free fall rod can be automatically returned to the standard position through the automatic return component;

[0023] The free-fall rod can be rotated through the angle adjustment component to change the contact position between the product and the test turntable, thus meeting the drop test requirements for different parts of the product.

[0024] The free fall device provided by the utility model is not only easy to operate and adjust, but also can meet the demand for automated drop testing of products, thereby effectively improving the testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a three-dimensional diagram of the whole free-fall device with automatic return of the utility model;

[0027] Figure 2 It is a front view of the whole free-fall device with automatic return of the utility model;

[0028] Figure 3 It is a partial three-dimensional diagram of a free-fall device with automatic return of the utility model;

[0029] Figure 4 It is a three-dimensional diagram of the holding and rotating assembly of the utility model;

[0030] Figure 5 It is a three-dimensional diagram of the automatic homing assembly of the utility model;

[0031] Figure 6 It is a three-dimensional diagram of the auxiliary lifting assembly of the utility model;

[0032] Figure 7 It is a three-dimensional diagram of the angle adjustment component of the utility model;

[0033] Figure 8 It is a three-dimensional diagram of the spring push assembly of the utility model.

[0034] The numbers in the figure represent:

[0035] 10. Test bench; 11. Encoder; 12. Test turntable; 20. Fixed bottom plate; 21. Vertical plate; 22. Fixed frame; 30. Bracket; 31. Rotating axis 1; 32. Connecting block; 33. Rotating axis 2; 34. Connecting frame; 35. Free fall rod; 36. Guide rod; 40. Automatic return assembly; 41. Guide block; 42. V-shaped guide groove; 43. Electric cylinder; 50. Auxiliary lifting assembly; 51. Lifting cylinder; 52. Roller; 53. Lifting plate 60. Spring push assembly; 61. Fixed block; 62. Slide rod; 63. Compression spring; 64. Push plate; 70. Angle adjustment assembly; 71. Rotating dial; 72. Toothed disc; 73. Locking pin; 74. Fixed seat; 80. Holding rotating assembly; 81. Fixed plate; 82. Servo motor; 83. Synchronous belt transmission structure; 84. RV reducer; 85. Pneumatic clutch. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] The terms “left”, “right”, “front”, “back”, “up” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0038] Embodiment 1

[0039] In some embodiments, please refer to the attached instructions. Figure 1-8 , a free fall device with automatic homing, comprising a test bench 10, a fixed base plate 20 fixedly mounted on the test bench 10, and a test turntable 12 rotatably mounted on the test bench 10;

[0040] The fixed bottom plate 20 is fixedly mounted with a vertical plate 21 and a bracket 30, the top of the vertical plate 21 is fixedly mounted with a fixed bracket 22, the bracket 30 is rotatably connected to the first rotating shaft 31 through a bearing; a connecting block 32 is fixedly mounted on the vertical plate 21, the second rotating shaft 33 is rotatably connected to the connecting block 32 through a bearing, and the second rotating shaft 33 is fixedly connected to the inner wall of the connecting bracket 34; the connecting bracket 34 has two axial rotational degrees of freedom through the first rotating shaft 31 and the second rotating shaft 33;

[0041] The connecting frame 34 is provided with an angle adjustment assembly 70 at one end close to the test turntable 12, a free fall rod 35 is fixedly installed at the movable end of the angle adjustment assembly 70, and a guide rod 36 is fixedly installed at the other end of the connecting frame 34; the end of the free fall rod 35 is used to support and fix the product;

[0042] The rotation of the free fall rod 35 through the rotation axis 1 31 is the rotation in the X direction, and the rotation of the free fall rod 35 through the connection block 32 is the rotation in the Y direction; the state in which the free fall rod 35 is perpendicular to the rotation axis 1 31 is set as the standard position of the free fall rod 35; the test turntable 12 is located on the rotation track of the free fall rod 35 in the standard position;

[0043] The test bench 10 is provided with an automatic return assembly 40 cooperating with the free fall rod 35, which is used to control the free fall rod 35 to return to the standard position; the fixed frame 22 is provided with a spring push assembly 60, which is used to adjust the falling speed of the free fall rod 35; the test bench 10 is also provided with an auxiliary lifting assembly 50 and a clamping rotation assembly 80, the output end of the clamping rotation assembly 80 is connected to the rotating shaft 1 31, which is used to control the rotation of the rotating shaft 1 31 to lift the free fall rod 35; the auxiliary lifting assembly 50 is located at the front side of the connecting frame 34, and is used to assist the rotation of the connecting frame 34;

[0044] The bracket 30 is provided with an encoder 11 connected to the rotating shaft 1 31, which is used to read the rotation parameters of the rotating shaft 1 31. The linear velocity of the product at the end of the free-fall rod 35 when it contacts the test turntable 12 can be calculated through the parameters such as the angular displacement and angular velocity of the rotating shaft 1 31, so as to obtain the instantaneous velocity of the product in free fall, and cooperate with the holding rotating assembly 80 to control the angular displacement of the free-fall rod 35;

[0045] In the present invention, the free-fall rod 35 is controlled to rotate in the X direction by holding the rotating assembly 80 to drive the rotating shaft 1 31 to rotate, until the free-fall rod 35 contacts the spring pushing assembly 60, and the spring pushing assembly 60 provides an initial thrust for the free fall of the free-fall rod 35, and the initial thrust is controlled by adjusting the different compression amounts of the spring pushing assembly 60, so that the free-fall rod 35 can have different initial velocities when released;

[0046] During the lifting process of the free-fall rod 35, the auxiliary lifting assembly 50 synchronously supports the connecting frame 34 to assist the lifting of the free-fall rod 35, and the automatic return assembly 40 is synchronously adjusted with the height of the free-fall rod 35 to ensure that the free-fall rod 35 does not rotate in the Y direction;

[0047] Then, the rotating assembly 80 is held tightly to release the rotating shaft 1 31 so that the rotating shaft 1 31 can rotate freely in the X direction, and the free-fall rod 35 falls on the test turntable 12 in a free-fall manner under the push of the spring push assembly 60, so that the product on the free-fall rod 35 can have an instantaneous speed of seven meters per second when it contacts the test turntable 12, meeting the drop test requirements for the product;

[0048] By directly turning the test turntable 12 or controlling the test turntable 12 to rotate through the servo motor drive structure, and adjusting the automatic return component 40 when the free fall rod 35 is in free fall, the free fall rod 35 loses the control effect on the free fall rod 35, and the free fall rod 35 can rotate freely in the Y direction, so that when the free fall rod 35 contacts the test turntable 12, it will rotate in the Y direction with the rotation of the test turntable 12, simulating the falling of the product in the moving state, and by adjusting the rotation speed of the test turntable 12, the drop test requirements of the product in different scenarios can be met; before the next drop test, the free fall rod 35 can be automatically returned to the standard position through the automatic return component 40;

[0049] The free-fall rod 35 can be rotated by the angle adjustment assembly 70 to change the contact position between the product and the test turntable 12, thereby realizing the drop test requirements for different parts of the product;

[0050] The free fall device provided by the utility model is not only easy to operate and adjust, but also can meet the demand for automated drop testing of products, thereby effectively improving the testing efficiency.

[0051] The automatic homing assembly 40 includes a guide block 41, a V-shaped guide groove 42 and an electric cylinder 43. The electric cylinder 43 is fixedly mounted on the lower side of the test bench 10. The output end of the electric cylinder 43 is fixedly mounted with the guide block 41. The guide block 41 is provided with a V-shaped guide groove 42. The bottom of the V-shaped guide groove 42 is tilted to cooperate with the rotation of the connecting frame 34 in the Y direction. The height of the guide block 41 is controlled by the electric cylinder 43, so that the V-shaped guide groove 42 gradually moves up and approaches the guide rod 36, and the guide rod 36 gradually slides When the guide rod 36 falls to the bottom of the V-shaped guide groove 42, the connecting frame 34 rotates in the Y direction until the guide rod 36 is completely stuck in the V-shaped bottom of the V-shaped guide groove 42, and the guide rod 36 automatically returns to the standard position; and when the guide rod 36 is located inside the V-shaped guide groove 42 and is on the upper side of the V-shaped guide groove 42, the guide rod 36 can swing in the V-shaped guide groove 42, so that the free fall rod 35 has a certain degree of rotation freedom in the Y direction, and cooperates with the rotating test turntable 12 to meet the rotation requirements of the product in different scenarios.

[0052] The clamping and rotating assembly 80 includes a fixed plate 81, a servo motor 82, a synchronous belt transmission structure 83, an RV reducer 84 and a pneumatic clutch 85. The fixed plate 81 is fixedly connected to the test bench 10, and the servo motor 82 and the RV reducer 84 are fixedly connected to the fixed plate 81. The output end of the servo motor 82 is transmission-connected to the input end of the RV reducer 84 through the synchronous belt transmission structure 83, and the output end of the RV reducer 84 is connected to the rotating shaft 31 through the pneumatic clutch 85; when the pneumatic clutch 85 is in a closed state, the rotating shaft 31 and the output end of the RV reducer 84 rotate synchronously, and the rotating shaft 31 can be driven to rotate by the servo motor 82, and the free fall rod 35 can be controlled to rotate to a set height with the cooperation of the encoder 11, and the RV reducer can achieve low speed and high torque; when the pneumatic clutch 85 is in a loose state, the rotating shaft 31 can rotate freely to achieve the free fall effect of the free fall rod 35.

[0053] The auxiliary lifting assembly 50 includes a lifting cylinder 51 and a roller 52. The lifting cylinder 51 is fixedly installed at the lower end of the test bench 10. The output end of the lifting cylinder 51 is fixedly connected to the lifting plate 53 through a guide structure. The roller 52 is rotatably connected to the lifting plate 53 through a bearing. When the rotating shaft 31 drives the free fall rod 35 to rotate through the connecting frame 34, the output end of the lifting cylinder 51 drives the roller 52 to move vertically upward through the lifting plate 53, supports the connecting frame 34 and moves upward synchronously with the connecting frame 34, assists the rotation and lifting of the free fall rod 35, and resets before free fall, without blocking the normal rotation of the connecting frame 34.

[0054] The spring pushing assembly 60 includes a fixed block 61, a sliding rod 62, a compression spring 63 and a pushing plate 64. The fixed block 61 is fixedly connected to the fixed frame 22. The sliding rods 62 are symmetrically fixedly installed at both ends of the fixed block 61. The pushing plate 64 is slidably connected to the sliding rod 62 through a linear bearing; the compression spring 63 is sleeved on the sliding rod 62, and the two ends of the compression spring 63 are respectively fixedly connected to the fixed block 61 and the pushing plate 64; when the free fall rod 35 presses the pushing plate 64, force can be accumulated by adjusting the compression amount of the compression spring 63, so that when the free fall rod 35 is in free fall, the pushing plate 64 can provide thrusts of different sizes to change the initial velocity of the free fall rod 35.

[0055] The angle adjustment assembly 70 includes a rotating dial 71, a toothed disc 72, a locking pin 73 and a fixing seat 74. The rotating dial 71 and the fixing seat 74 are fixedly connected to the connecting frame 34. The toothed disc 72 is rotatably connected to the rotating dial 71 through a bearing, and is fixedly connected to the free fall rod 35. The fixing seat 74 is provided with a locking pin 73 that is engaged with the teeth of the toothed disc 72. The rotating toothed disc 72 can drive the free fall rod 35 to rotate synchronously, thereby changing the contact position between the product and the test turntable 12, and the toothed disc 72 is clamped by the locking pin 73 to fix the rotation angle of the free fall rod 35, thereby completing the drop test of different parts of the product.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A free-fall device with automatic homing, comprising a test bench (10), a fixed base plate (20) fixedly mounted on the test bench (10), and a test turntable (12) rotatably mounted on the test bench (10), characterized in that: The fixed bottom plate (20) is fixedly mounted with a vertical plate (21) and a bracket (30); a fixed frame (22) is fixedly mounted on the top of the vertical plate (21); the bracket (30) is rotatably connected to the first rotating shaft (31) via a bearing; a connecting block (32) is fixedly mounted on the vertical plate (21); the second rotating shaft (33) is rotatably connected to the connecting block (32) via a bearing; the second rotating shaft (33) is fixedly connected to the inner wall of the connecting frame (34); the connecting frame (34) has two axial degrees of rotational freedom via the first rotating shaft (31) and the second rotating shaft (33); An angle adjustment assembly (70) is provided at one end of the connecting frame (34) close to the test turntable (12); a free-fall rod (35) is fixedly mounted on the movable end of the angle adjustment assembly (70); a guide rod (36) is fixedly mounted on the other end of the connecting frame (34); the end of the free-fall rod (35) is used to support and fix the product; an automatic return assembly (40) cooperating with the free-fall rod (35) is provided on the test bench (10) for controlling the free-fall rod (35) to return to a standard position; The fixing frame (22) is provided with a spring pushing assembly (60) for adjusting the falling speed of the free-fall rod (35); the test bench (10) is also provided with an auxiliary lifting assembly (50) and a clamping rotation assembly (80); the output end of the clamping rotation assembly (80) is connected to the rotating shaft 1 (31) for controlling the rotation of the rotating shaft 1 (31) to lift the free-fall rod (35); the auxiliary lifting assembly (50) is located at the front side of the connecting frame (34) for assisting the rotation of the connecting frame (34); The bracket (30) is provided with an encoder (11) connected to the rotating shaft one (31) and used for reading the rotation parameters of the rotating shaft one (31).

2. The free-fall device with automatic homing according to claim 1, characterized in that: The automatic homing assembly (40) comprises a guide block (41), a V-shaped guide groove (42) and an electric cylinder (43); the electric cylinder (43) is fixedly mounted on the lower side of the test bench (10); the guide block (41) is fixedly mounted on the output end of the electric cylinder (43); and the guide block (41) is provided with a V-shaped guide groove (42).

3. The free-fall device with automatic homing according to claim 2, characterized in that: The bottom of the V-shaped guide groove (42) is arranged to be inclined so as to cooperate with the rotation of the connecting frame (34) in the Y direction.

4. The free-fall device with automatic homing according to claim 3, characterized in that: The clamping rotation assembly (80) comprises a fixed plate (81), a servo motor (82), a synchronous belt transmission structure (83), an RV reducer (84) and a pneumatic clutch (85); the fixed plate (81) is fixedly connected to the test bench (10); the servo motor (82) and the RV reducer (84) are fixedly connected to the fixed plate (81); the output end of the servo motor (82) is transmission-connected to the input end of the RV reducer (84) via the synchronous belt transmission structure (83); and the output end of the RV reducer (84) is connected to the rotating shaft 1 (31) via the pneumatic clutch (85).

5. The free-fall device with automatic homing according to claim 4, characterized in that: The auxiliary lifting assembly (50) comprises a lifting cylinder (51) and a roller (52); the lifting cylinder (51) is fixedly mounted on the lower end of the test bench (10); the output end of the lifting cylinder (51) is fixedly connected to a lifting plate (53) via a guide structure; and the lifting plate (53) is rotatably connected to the roller (52) via a bearing.

6. The free-fall device with automatic homing according to claim 5, characterized in that: The spring pushing assembly (60) comprises a fixed block (61), a sliding rod (62), a compression spring (63) and a pushing plate (64); the fixed block (61) is fixedly connected to the fixed frame (22); the sliding rods (62) are symmetrically fixedly installed at both ends of the fixed block (61); and the pushing plate (64) is slidably connected to the sliding rod (62) via a linear bearing.

7. The free-fall device with automatic homing according to claim 6, characterized in that: The angle adjustment assembly (70) comprises a rotating dial (71), a toothed disc (72) and a locking assembly. The rotating dial (71) is fixedly connected to the connecting frame (34). The toothed disc (72) is rotatably connected to the rotating dial (71) via a bearing and is fixedly connected to the free-fall rod (35). The connecting frame (34) is provided with a locking assembly for locking the position of the toothed disc (72).

8. The free-fall device with automatic homing according to claim 7, characterized in that: The locking assembly comprises a locking pin (73) and a fixing seat (74); the fixing seat (74) is fixedly connected to the connecting frame (34); and the fixing seat (74) is provided with a locking pin (73) engaged with the teeth of the toothed disc (72).

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