A Precision Constant Pressure Seesaw Testing Machine

Abstract

This invention claims protection for a precision constant pressure seesaw testing machine. The key technical features include an air tank and a platform for mounting a sample seesaw. A support cylinder is located on the side of the platform away from the air tank. A bracket is fixedly connected to the air tank, and a load cylinder connected to the air tank is fixedly connected to the bracket. The telescopic end of the load cylinder is connected to a steel wire rope for connecting to the surface of the sample seesaw. A first connecting rod extending to the platform is rotatably connected to the bottom of the bracket. A first pulley for changing the extension direction of the steel wire rope is rotatably connected to the end of the first connecting rod away from the bracket. The first connecting rod also has a track for the first pulley to slide on. This invention features a relatively freely movable pulley, allowing the pulley's position to follow the movement of the sample seesaw and the fixed point of the steel wire rope, thus ensuring that the steel wire rope remains perpendicular to the horizontal plane and avoiding test errors caused by the inclination of the steel wire rope.

Description

Technical Field

[0001] This invention relates to a seesaw testing machine, and more specifically, to a precision constant pressure seesaw testing machine. Background Technology

[0002] Seesaws are a popular toy among children, but because two children are positioned at opposite ends of the seesaw while the fulcrum is in the middle, the seesaw experiences downward pressure at both ends and upward pressure in the middle, making it prone to breaking and causing children to fall and get injured. Therefore, it is necessary to test the seesaw's breakage under different pressure conditions. Current technology typically involves fixing a steel wire rope to the seesaw, which is connected to a pressure-applying device via multiple pulleys. The steel wire rope allows for precise control of the applied pressure. However, because the horizontal length of the seesaw changes continuously during rotation, the fixing point of the steel wire rope will shift horizontally, and the fixing point will not be in the same vertical direction as the first pulley, leading to testing errors. Therefore, a more precise constant-pressure seesaw testing machine is needed.

[0003] Based on the above reasons, this is precisely the issue that this application addresses. Summary of the Invention

[0004] To address the shortcomings of existing technologies, a precision constant pressure seesaw testing machine is provided. This device ensures that the fixing point of the steel wire rope and the first pulley are always in the same vertical direction.

[0005] To achieve the above objectives, the following technical solution is provided: a precision constant pressure seesaw testing machine, comprising an air tank and a platform for mounting a sample seesaw, a support cylinder is provided on the side of the platform away from the air tank, a bracket is fixedly connected to the air tank, a load cylinder connected to the air tank is fixedly connected to the bracket, a steel wire rope is connected to the telescopic end of the load cylinder for connecting to the surface of the sample seesaw, a first connecting rod extending to the platform is rotatably connected to the bottom of the bracket, a first pulley for changing the extension direction of the steel wire rope is rotatably connected to the end of the first connecting rod away from the bracket, and a track for the first pulley to slide on the first connecting rod;

[0006] When in use, it has the following operations:

[0007] Install the base of the seesaw on the platform, and make the extension direction of the seesaw perpendicular to the extension direction of the first connecting rod.

[0008] The steel wire rope is passed through the first pulley and connected to the telescopic end of the load cylinder;

[0009] Place one end of the seesaw under the support cylinder and abut it against the support cylinder.

[0010] The other end of the seesaw is fixedly connected to the steel wire rope, with the fixing point above the first pulley and the taut steel wire rope perpendicular to the horizontal plane.

[0011] Adjusting the air pressure inside the air tank, thereby adjusting the pressure applied by the load cylinder to the seesaw's surface via the steel wire rope;

[0012] Rotating the surface of the seesaw causes the first pulley and the first connecting rod to move.

[0013] When the first pulley and the first connecting rod stop moving, record the magnitude of the pressure and whether cracks or other breakages appear on the surface of the seesaw.

[0014] In summary, the above technical solution has the following beneficial effects: the load cylinder generates pressure by pulling the steel wire rope. If the taut steel wire rope is kept perpendicular to the horizontal plane, this pressure can be concentrated at one end of the seesaw. If it cannot be kept perpendicular, the pressure will be distributed into horizontal pressure and vertical pressure. The horizontal pressure will act on the first pulley, while the vertical pressure is the real pressure on one end of the seesaw. The pressure that actually acts on the seesaw cannot be adjusted by the air tank. Therefore, the taut steel wire rope needs to always be kept perpendicular to the horizontal plane.

[0015] As the seesaw rotates, the fixing point of the steel wire rope moves along an arc track centered on the fulcrum, resulting in horizontal displacement. This causes the steel wire rope, which was originally perpendicular to the horizontal plane, to tilt, thus dispersing the pressure and making it impossible to adjust the pressure actually acting on the seesaw using an air tank. Therefore, it is necessary to set a first pulley that can move with the fixing point. In this invention, the first pulley can move arbitrarily within the track on the first connecting rod, and the first connecting rod can also rotate, so the first pulley can move in any direction.

[0016] In addition, since the contact point between the wire rope and the first pulley is located on the side of the first pulley, the first pulley can be rotated within the track to further fine-tune its position so that the wire rope remains perpendicular to the horizontal plane.

[0017] This invention features a relatively freely movable pulley, allowing its position to follow the movement of the fixed point of the seesaw and the steel wire rope. This ensures that the steel wire rope remains perpendicular to the horizontal plane, preventing the fixed point of the steel wire rope from shifting horizontally due to the continuous change in the horizontal length of the seesaw's surface during rotation. This avoids errors in the experiment caused by the tilting of the steel wire rope. Attached Figure Description

[0018] Figure 1 A three-dimensional structural diagram of a precision constant pressure seesaw testing machine;

[0019] Figure 2 This is a bottom cross-sectional view of the present invention;

[0020] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0021] Figure 4 for Figure 2 A magnified view of a section at point B in the middle;

[0022] Figure 5 This is a cross-sectional view of the gas tank;

[0023] Figure 6 This is a cross-sectional view of the anti-collision cylinder and the safety cylinder.

[0024] Reference numerals: 1. Platform; 2. Gas tank; 3. Support cylinder; 4. Bracket; 5. Load cylinder; 6. Steel wire rope; 7. First connecting rod;

[0025] 11. Anti-collision cylinder; 12. Safety cylinder; 13. Second connecting rod;

[0026] 111. First telescopic rod; 112. First cylinder body; 113. First seal;

[0027] 121. Second telescopic rod; 122. Second cylinder; 123. Second seal;

[0028] 131. Abutment rod;

[0029] 21. Third connecting rod; 22. Valve mechanism; 23. Compartment; 24. Second rotating connecting piece; 25. Opening; 26. Control mechanism; 27. Pressure detector; 28. Display screen;

[0030] 211. Conflicting block;

[0031] 221. Safety valve; 222. Third rotating connector; 223. Fourth connecting rod;

[0032] 231. Connect the valve;

[0033] 71. First pulley; 72. Track; 73. First rotating connector; 74. Second pulley. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are denoted by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0035] Reference Figure 1-6 As shown, a precision constant pressure seesaw testing machine includes an air tank 2 and a platform 1 for mounting a sample seesaw. A support cylinder 3 is provided on the side of the platform 1 away from the air tank 2. A bracket 4 is fixedly connected to the air tank 2. A load cylinder 5 connected to the air tank 2 is fixedly connected to the bracket 4. A steel wire rope 6 for connecting to the surface of the sample seesaw is connected to the telescopic end of the load cylinder 5. A first connecting rod 7 extending to the platform 1 is rotatably connected to the bottom of the bracket 4. A first pulley 71 for changing the extension direction of the steel wire rope 6 is rotatably connected to the end of the first connecting rod 7 away from the bracket 4. A track 72 for the first pulley 71 to slide is also provided on the first connecting rod 7.

[0036] When in use, it has the following operations:

[0037] Install the base of the seesaw on the platform 1, and make the extension direction of the seesaw perpendicular to the extension direction of the first connecting rod 7.

[0038] The steel wire rope 6 is passed through the first pulley 71 and connected to the telescopic end of the load cylinder 5;

[0039] Place one end of the seesaw board under the support cylinder 3 and abut it against the support cylinder 3.

[0040] The other end of the seesaw is fixedly connected to the steel wire rope 6, so that the fixing point is above the first pulley 71 and the taut steel wire rope 6 is kept perpendicular to the horizontal plane.

[0041] Adjust the air pressure inside the air tank 2, thereby adjusting the pressure applied by the load cylinder 5 to the surface of the seesaw via the steel wire rope 6;

[0042] Rotating the surface of the seesaw causes the first pulley 71 and the first connecting rod 7 to move.

[0043] When the first pulley 71 and the first connecting rod 7 stop displacing, record the magnitude of the pressure and whether cracks or other breakages appear on the surface of the seesaw.

[0044] The load cylinder 5 generates pressure by pulling the steel wire rope 6. If the taut steel wire rope 6 is kept perpendicular to the horizontal plane, the pressure can be concentrated at one end of the seesaw. If it cannot be kept perpendicular, the pressure will be distributed into horizontal pressure and vertical pressure. The horizontal pressure will act on the first pulley 71, while the vertical pressure is the actual pressure on one end of the seesaw. The pressure that actually acts on the seesaw cannot be adjusted by the air tank 2. Therefore, the taut steel wire rope 6 must always be kept perpendicular to the horizontal plane.

[0045] During the rotation of the seesaw, the fixing point of the fixed steel wire rope 6 will move along the arc track 72 centered on the fulcrum. This will cause a horizontal displacement, causing the steel wire rope 6, which was originally perpendicular to the horizontal plane, to tilt. This will disperse the pressure, making it impossible to adjust the pressure actually acting on the seesaw through the air tank 2. Therefore, it is necessary to set a first pulley 71 that can move with the fixing point. In this invention, the first pulley 71 can move arbitrarily within the track 72 on the first connecting rod 7. The first connecting rod 7 can also rotate, so the first pulley 71 can move in any direction.

[0046] Furthermore, since the contact point between the wire rope 6 and the first pulley 71 is located on the side of the first pulley 71, the first pulley 71 can be rotated within the track 72, allowing for further fine-tuning of its position so that the wire rope 6 remains perpendicular to the horizontal plane.

[0047] The present invention is equipped with a relatively freely movable pulley, so that the position of the pulley can follow the movement of the fixed point of the seesaw and the steel wire rope 6, thereby keeping the steel wire rope 6 perpendicular to the horizontal plane. This avoids the displacement of the fixed point of the steel wire rope 6 in the horizontal direction due to the continuous change of the horizontal length of the seesaw during rotation, which would ultimately cause errors in the test due to the tilt of the steel wire rope.

[0048] Furthermore, the load cylinder 5 is fixedly connected to the top of the bracket 4 and the telescopic end of the load cylinder 5 can extend and retract in the vertical direction. The bottom of the bracket 4 is also rotatably connected to a first rotating connector 73 that is fixedly connected to the first connecting rod 7. The first rotating connector 73 is located below the load cylinder 5 and is located in the same vertical direction as the load cylinder 5.

[0049] The first connecting rod 7 is also fixedly connected to a second pulley 74 for changing the extension direction of the wire rope 6. The second pulley 74 is located below the load cylinder 5 and is located in the same vertical direction as the load cylinder 5 and the first rotating connecting member 73.

[0050] The first connecting rod 7 can rotate around the first rotating connecting piece 73. At the same time, in order to minimize the actual moving distance of the wire rope 6, the load cylinder 5 and the first rotating connecting piece 73 are set in the same vertical direction to avoid the wire rope 6 from moving additionally in the horizontal direction when the extension end of the load cylinder 5 is extended or retracted.

[0051] To prevent the steel wire rope 6 from tilting and causing the applied pressure to disperse, a second pulley 74 is provided in the same vertical direction as the load cylinder 5 and the first rotating connector 73, so that the steel wire rope 6 connected to the load cylinder 5 always remains perpendicular to the horizontal plane.

[0052] Furthermore, a collision-resistant cylinder 11 is fixedly connected to the platform 1 for the surface of the seesaw to collide with the seesaw.

[0053] The bottom of the anti-collision cylinder 11 extends out of the platform 1 and is fixedly connected to a safety cylinder 12 that communicates with the anti-collision cylinder 11. When the telescopic end of the anti-collision cylinder 11 is abutted and retracted, the telescopic end of the safety cylinder 12 will extend. The bottom of the platform 1 is also rotatably connected to a second connecting rod 13 for the telescopic end of the safety cylinder 12 to abut. The second connecting rod 13 extends to the bottom of the bracket 4 and is fixedly connected to an abutting rod 131 that extends into the bracket 4 at the end away from the safety cylinder 12. The abutting rod 131 abuts against a third connecting rod 21 that extends into the gas tank 2. The third connecting rod 21 is connected to a valve mechanism 22 located inside the gas tank 2.

[0054] When the seesaw's surface touches the telescopic end of the anti-collision cylinder 11, the telescopic end of the safety cylinder 12 will extend, and then touch the second connecting rod 13 and cause the second connecting rod 13 to rotate. At this time, the abutting rod 131 on the second connecting rod 13 will abut against the third connecting rod 21 to open the valve mechanism 22, and then the inside of the gas tank 2 will be connected to the atmosphere, thereby preventing the pressure inside the gas tank 2 from being too low and causing the seesaw's surface to be too close to the ground.

[0055] Furthermore, the anti-collision cylinder 11 includes a first telescopic rod 111 for contacting the surface of the seesaw and a first cylinder 112 for accommodating the first telescopic rod 111. The first contact rod 131 is located inside the first cylinder 112 and is fixedly connected at one end to a first sealing element 113 that is slidably connected to the inner wall of the first cylinder 112. The safety cylinder 12 includes a second telescopic rod 121 for contacting the second connecting rod 13 and a second cylinder 122 for accommodating the second telescopic rod 121. The second contact rod 131 is located inside the second cylinder 122 and is fixedly connected at one end to a second sealing element 123 that is slidably connected to the inner wall of the second cylinder 122. The bottom of the first cylinder 112 is connected to the bottom of the second cylinder 122.

[0056] The first seal 113, the first cylinder 112, the second seal 123, and the second cylinder 122 form a sealed space with a fixed volume. When the first telescopic rod 111 moves toward the inside of the first cylinder 112, the sealed space composed of the first seal 113 and the first cylinder 112 becomes smaller, and therefore the sealed space composed of the second seal 123 and the second cylinder 122 becomes larger, thereby causing the second abutment rod 131 to extend.

[0057] Furthermore, the gas tank 2 is provided with a sealed chamber 23, which is connected to the load cylinder. The chamber 23 is provided with a connecting valve 231 for connecting the air pump. The bottom of the gas tank 2 is rotatably connected to a second rotating connecting piece 24 which is fixedly connected to the third connecting rod 21. The bottom of the gas tank 2 is also provided with an opening 25 for the third connecting rod 21 to rotate. The bottom of the third connecting rod 21 is fixedly connected to an abutting block 211 for abutting against the abutting rod 131.

[0058] Valve mechanism 22 is located at the bottom of chamber 23. Valve mechanism 22 includes a safety valve 221 that is rotatably connected to the outer wall of chamber 23. A third rotating connecting member 222 is fixedly connected to the safety valve 221. A fourth connecting rod 223 that is rotatably connected to the third connecting rod 21 is rotatably connected to the third rotating connecting member 222.

[0059] Since the second connecting rod 13 will drive the abutment rod 131 to move in an arc when it rotates, in order to ensure that the abutment rod 131 can drive the third connecting rod 21 to rotate at all times, a longer abutment block 211 is set to keep in contact with the abutment rod 131. After the abutment block 211 is abutted by the abutment rod 131, it will drive the third connecting rod 21 to rotate around the second rotating connector 24. When it rotates, it will drive the fourth connecting rod 223 to move. The fourth connecting rod 223 will drive the safety valve 221 to rotate through the third rotating connector 222, thereby opening the valve mechanism 22 to connect the inside of the gas tank 2 with the atmosphere.

[0060] Furthermore, the gas tank 2 is also equipped with a control mechanism 26. The control mechanism 26 is electrically connected to a pressure detector 27 located in the chamber 23 and a display screen 28 extending from the surface of the gas tank 2. The pressure detector 27 can detect the gas pressure inside the gas tank 2 in real time, and then the control mechanism 26 calculates the actual applied pressure and displays it on the display screen 28, so that the experimenter can accurately control the pressure.

[0061] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A precision constant pressure seesaw testing machine, characterized in that, The utility model provides a kind of installation type pattern seesaw, including gas tank (2) and the platform (1) for installing pattern seesaw, the platform (1) is equipped with support cylinder (3) away from the side of gas tank (2), the gas tank (2) is fixedly connected with support (4), the support (4) is fixedly connected with the load cylinder (5) connected with gas tank (2), the telescopic end of the load cylinder (5) is connected with the steel wire rope (6) for being connected with the board surface of pattern seesaw, the first connecting rod (7) of support (4) bottom rotationally connected is extended to platform (1), the first connecting rod (7) rotationally connected with first pulley (71) for changing the extension direction of steel wire rope (6) away from the side of support (4) end, the first connecting rod (7) is also equipped with track (72) for sliding first pulley (71). The load cylinder (5) is fixedly connected on the top of support (4), and the telescopic end of the load cylinder (5) can be telescopic in the vertical direction, the bottom of the support (4) is also rotationally connected with the first rotary connecting piece (73) fixedly connected with the first connecting rod (7), and the first rotary connecting piece (73) is arranged below the load cylinder (5) and arranged in the same vertical direction with the load cylinder (5). The first connecting rod (7) is also fixedly connected with the second pulley (74) for changing the extension direction of steel wire rope (6), and the second pulley (74) is arranged below the load cylinder (5) and arranged in the same vertical direction with the load cylinder (5) and the first rotary connecting piece (73).

2. The precision constant rate of loading seesaw testing machine of claim 1, wherein, When in use, the following operations are performed: Install the base of the pattern seesaw on the platform (1), and make the extension direction of the board surface of the pattern seesaw perpendicular to the extension direction of the first connecting rod (7); Pass the steel wire rope (6) through the first pulley (71) and connect it with the telescopic end of the load cylinder (5); Place one end of the board surface of the pattern seesaw below the support cylinder (3) and abut against the support cylinder (3); Fixedly connect the other end of the board surface of the pattern seesaw with the steel wire rope (6), so that the fixed point is above the first pulley (71), and make the taut steel wire rope (6) perpendicular to the horizontal plane; Adjust the air pressure in the gas tank (2), so as to adjust the pressure exerted by the load cylinder (5) on the board surface of the seesaw through the steel wire rope (6); Rotate the board surface of the pattern seesaw, drive the first pulley (71) and the first connecting rod (7) to displace; When the first pulley (71) and the first connecting rod (7) stop displacing, record the pressure and whether the surface of the pattern seesaw is cracked or broken.

3. The precision constant rate of loading seesaw testing machine of claim 1, wherein, The platform (1) is also fixedly connected with the anti-collision cylinder (11) for abutting against the board surface of the pattern seesaw.

4. The precision constant rate of loading seesaw testing machine of claim 3, wherein, The anti-collision air cylinder (11) extends from the platform (1) and is fixedly connected with a safety air cylinder (12) in communication with the anti-collision air cylinder (11), the telescopic end of the safety air cylinder (12) is elongated when the telescopic end of the anti-collision air cylinder (11) is abutted and retracted, the bottom of the platform (1) is also rotatably connected with a second connecting rod (13) for abutting the telescopic end of the safety air cylinder (12), the second connecting rod (13) extends to the bottom of the support (4) and is fixedly connected with an abutting rod (131) extending into the inside of the support (4) at one end away from the safety air cylinder (12), the abutting rod (131) is abutted with a third connecting rod (21) extending into the inside of the air tank (2), and the third connecting rod (21) is connected with a valve mechanism (22) arranged in the air tank (2).

5. The precision constant rate of loading seesaw testing machine of claim 4, wherein, The anti-collision air cylinder (11) includes a first telescopic rod (111) for abutting the plate surface of the seesaw type and a first cylinder body (112) for accommodating the first telescopic rod (111), one end of the first telescopic rod (111) arranged in the first cylinder body (112) is fixedly connected with a first sealing element (113) in sliding connection with the inner wall of the first cylinder body (112), the safety air cylinder (12) includes a second telescopic rod (121) for abutting the second connecting rod (13) and a second cylinder body (122) for accommodating the second telescopic rod (121), one end of the second telescopic rod (121) arranged in the second cylinder body (122) is fixedly connected with a second sealing element (123) in sliding connection with the inner wall of the second cylinder body (122), and the bottom of the first cylinder body (112) is in communication with the bottom of the second cylinder body (122).

6. The precision constant rate of loading seesaw testing machine of claim 4, wherein, The air tank (2) is provided with a sealed chamber (23), the chamber (23) is in communication with the load air cylinder, the chamber (23) is provided with a connecting valve (231) for connecting the air pump, the bottom of the air tank (2) is rotatably connected with a second rotary connecting element (24) fixedly connected with the third connecting rod (21), and the bottom of the air tank (2) is also provided with an opening (25) for rotation of the third connecting rod (21), and the bottom of the third connecting rod (21) is fixedly connected with an abutting block (211) for abutting the abutting rod (131).

7. A precision constant rate of loading seesaw testing machine according to claim 6 wherein, The valve mechanism (22) is arranged at the bottom of the chamber (23), and the valve mechanism (22) includes a safety valve (221) rotatably connected with the outer wall of the chamber (23), the safety valve (221) is fixedly connected with a third rotary connecting element (222), and the third rotary connecting element (222) is rotatably connected with a fourth connecting rod (223) rotatably connected with the third connecting rod (21).

8. The precision constant rate of loading seesaw testing machine of claim 1 wherein, The air tank (2) is also provided with a control mechanism (26), and the control mechanism (26) is electrically connected with a pressure detector (27) arranged in the chamber (23) and a display screen (28) extending out of the surface of the air tank (2).

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