An automatic loading bar and a balance loading vehicle using the same
By designing an automatic loading rod and utilizing a combination of electric cylinders and elastic elements, the wind tunnel balance can be automatically loaded, solving the problem of complex structure in existing devices and improving measurement accuracy and the certainty of uncertainty.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING INST OF SPECIALIZED MACHINERY
- Filing Date
- 2022-12-30
- Publication Date
- 2026-06-23
AI Technical Summary
Existing wind tunnel balance loading devices have complex structures and cannot achieve automatic loading, which affects the accuracy and uncertainty of measurements.
An automatic loading rod was designed, comprising a first electric cylinder, a heavy-duty elastic element, a light-duty isolation sleeve, a guide element, and a heavy-duty sensor within the rod body. The magnitude and direction of the loading force are controlled by the piston rod of the electric cylinder, and the loading force is measured by the light-duty and heavy-duty sensors to achieve automatic loading.
Automatic loading of the wind tunnel balance was achieved, improving the accuracy and certainty of measurement uncertainty, especially enabling accurate measurement of loading force under both light and heavy load conditions.
Smart Images
Figure CN116007888B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of wind tunnel testing technology, and in particular to a wind tunnel balance loading device. Background Technology
[0002] Wind tunnel model testing is a crucial method for understanding aircraft performance and reducing development risks and costs during the aerospace vehicle development process. A wind tunnel balance is a high-precision measuring device that directly senses and measures aerodynamic forces and moments acting on the six degrees of freedom of the model. Because the aerodynamic loads acting on the six degrees of freedom of the wind tunnel model vary considerably, even though modern balances utilize advanced design techniques such as computer-aided design, finite element analysis, and optimization to fully consider the anti-interference capabilities of each structural elastic element against other loads, the relatively small spatial scale and complex structure of the balance still result in some degree of interference between the loads of each structural elastic element. Therefore, balance calibration is necessary to determine performance parameters such as accuracy and uncertainty. Balance calibration is a process of setting the independent variable (the applied load) and measuring the dependent variable (the balance's output response). This requires a loading device to apply a specific loading force to the balance, and then comparing this force with the force measured by the balance under that loading force to determine performance parameters such as accuracy and uncertainty. Existing loading devices are structurally complex and cannot achieve automatic loading. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to provide an automatic loading rod and a balance loading vehicle using the same, which has a relatively simple structure and can automatically apply loading force to the balance.
[0004] The automatic loading rod of this invention includes a rod body with a receiving cavity arranged along the length of the rod body. Within the receiving cavity, a first electric cylinder, a heavy-duty elastic element, a light-duty isolation sleeve, a guide member, and a heavy-duty sensor are sequentially arranged along the length of the rod body. One end of the first electric cylinder is fixedly disposed within the receiving cavity, and the other end of the first electric cylinder is connected to one end of the heavy-duty elastic element. The other end of the heavy-duty elastic element is connected to one end of the light-duty isolation sleeve, and the other end of the light-duty isolation sleeve is slidably fitted onto the guide member. The guide member has first and second stops arranged at intervals along the length of the rod body. The light-duty isolation... The other end of the sleeve is slidably disposed between the first stop and the second stop. The first stop is located inside the light-load isolation sleeve, and the second stop is located outside the other end of the light-load isolation sleeve. A light-load sensor is connected to the first stop, and a light-load elastic element is connected between the light-load sensor and one end of the light-load isolation sleeve. The light-load elastic element is located inside the light-load isolation sleeve. A heavy-load sensor is connected to the second stop, and the heavy-load sensor and the light-load isolation sleeve are located on opposite sides of the second stop. The heavy-load sensor is connected to one end of the first loading rope, and the other end of the first loading rope extends from the receiving cavity to the outside of the rod body.
[0005] In the automatic loading rod of the present invention, the cylinder body of the first electric cylinder is fixedly disposed in the receiving cavity, and the piston rod of the first electric cylinder is connected to one end of the heavy-duty elastic member.
[0006] In the automatic loading rod of the present invention, the heavy-duty elastic element is a heavy-duty spring, one end of the heavy-duty spring is connected to the piston rod of the first electric cylinder, and the other end of the heavy-duty spring is connected to one end of the light-duty isolation sleeve.
[0007] In the automatic loading rod of this invention, the guide component is a guide post, which is arranged along the length of the rod body. The first stop and the second stop are respectively provided at both ends of the guide post. One end of the light-load isolation sleeve is fixedly provided with an end cap, and the other end of the heavy-load spring is connected to the outside of the end cap. The other end of the light-load isolation sleeve is fixedly provided with an annular flange extending inward to the inside of the light-load isolation sleeve. The annular flange extends between the first stop and the second stop and is slidably fitted onto the guide post through its central hole. A light-load elastic component, which is a light-load spring, is connected between the light-load sensor and the inside of the end cap.
[0008] The automatic loading rod of the present invention has a strip-shaped sliding hole arranged along the length of the rod body, and a sliding pin is fixedly provided on the second stop. The sliding pin is inserted into one end of the strip-shaped sliding hole and extends from the receiving cavity through the strip-shaped sliding hole to the outside of the rod body. An automatic unloading switch is fixedly provided on the outside of the rod body and is arranged near the other end of the strip-shaped sliding hole. The automatic unloading switch and the heavy load sensor are respectively located on opposite sides of the second stop.
[0009] The automatic loading rod of the present invention has a support fixedly provided at one end of the rod near the heavy load sensor. Two first guide wheels arranged vertically are rotatably mounted on the support. The other end of the first loading rope comes out of the receiving cavity and passes between the two first guide wheels.
[0010] The balance loading vehicle using the above-mentioned automatic loading rod in this invention includes an AGV body, on which a support frame is fixedly mounted. The end of the automatic loading rod near the first electric cylinder is hinged to the upper end of the support frame. A second electric cylinder is connected between the automatic loading rod and the lower end of the support frame. The piston rod of the second electric cylinder is hinged to the rod body of the automatic loading rod, and the cylinder body of the second electric cylinder is hinged to the lower end of the support frame.
[0011] The balance loading vehicle of the present invention includes a vertical support base fixedly provided at the upper end of the support frame, a second guide wheel rotatably mounted on the vertical support base, a weight box fixedly provided on the AGV body, the weight box and the second electric cylinder being located on opposite sides of the support frame, the weights in the weight box being connected to one end of the second loading rope, and the other end of the second loading rope passing around the second guide wheel and passing out from the support.
[0012] The balance loading cart of the present invention includes a horizontal support base fixedly mounted on the support frame, a third guide wheel rotatably mounted on the horizontal support base, the third guide wheel being located above the weight box, the third guide wheel tensioning the second loading rope on the second guide wheel, and two fourth guide wheels arranged vertically rotatably mounted on the support, the other end of the second loading rope passing through the two fourth guide wheels.
[0013] The balance loading cart of this invention includes a weight box comprising a box body. A vertically arranged weight guide post is fixedly installed inside the box body. Multiple block-shaped weights are mounted vertically on the weight guide post. Each weight has a vertical through hole, with the vertical through holes of adjacent weights corresponding vertically. The vertical through holes of the multiple weights together form a vertical cavity. A weight lifting rod is installed inside the vertical cavity. Each weight has a horizontal through hole communicating with the vertical through hole. Multiple pin holes are provided vertically on the weight lifting rod, with each pin hole corresponding to a horizontal through hole on one of the weights. A weight selection pin is inserted through the horizontal through hole and the corresponding pin hole of one of the weights. The upper end of the weight lifting rod is connected to one end of a second loading rope. A loading position switch is fixedly installed inside the box body, located above the multiple weights.
[0014] The automatic loading rod and the balance loading vehicle using it in this invention differ from existing technologies in that, in use, the operator first fixes the position of the rod, then pulls the first loading rope to a stretched state, and then fixes the other end of the stretched first loading rope to the wind tunnel balance. Alternatively, the other end of the first loading rope can be fixed to the wind tunnel balance first, and then the rod can be moved to put the first loading rope into a stretched state (in this case, applying tension to one end of the first loading rope will apply the tension to the wind tunnel balance). The first loading rope did not apply tension to the heavy-load sensor. The piston rod of the first electric cylinder was extended, and both the light-load and heavy-load elastic elements were in a retracted state (at this time, both the light-load and heavy-load elastic elements were in a naturally retracted state, and the tension acting on them was 0). The other end of the light-load isolation sleeve abutted against the second stop, causing the piston rod of the first electric cylinder to retract. Thus, the first electric cylinder simultaneously pulled the heavy-load elastic element and the light-load elastic element installed in the light-load isolation sleeve. Due to the small initial tension of the first electric cylinder, it could not pull the heavy-load elastic element from its retracted state. In the extended state, only the light-load elastic element can be pulled from the contracted state to the extended state. Therefore, the piston rod of the first electric cylinder pulls the light-load isolation sleeve towards the first electric cylinder via the heavy-load elastic element (at this time, the light-load isolation sleeve slides along the guide from the second stop to the first stop and stretches the light-load elastic element). The pulling force of the first electric cylinder then acts on the wind tunnel balance sequentially through the heavy-load elastic element, the light-load isolation sleeve, the light-load elastic element, the light-load sensor, the guide, the heavy-load sensor, and the first loading rope. As the light-load isolation sleeve continues to slide until its other end reaches the first stop, this... At this time, the light-load elastic element is in the extended state, and even if the pulling force of the first electric cylinder increases further, the first electric cylinder cannot continue to pull the light-load isolation sleeve to slide towards the first electric cylinder (that is, the light-load isolation sleeve cannot continue to stretch the light-load elastic element). In other words, at this time, the pulling force of the first electric cylinder acts on the wind tunnel balance in sequence through the heavy-load elastic element, the light-load isolation sleeve, the guide, the heavy-load sensor, and the first loading rope. As the pulling force of the first electric cylinder continues to increase, the piston rod of the first electric cylinder will pull the heavy-load elastic element from the contracted state to the extended state. The heavy-load elastic element can be pulled to a suitable extended state depending on the specific situation.The above only describes the situation where the pulling force of the first electric cylinder increases from small to large (during which the piston rod of the first electric cylinder gradually retracts). When the pulling force of the first electric cylinder increases from small to large, and then decreases again, the piston rod of the first electric cylinder will gradually extend. First, the heavy-load elastic element gradually changes from an extended state to a retracted state (during this process, the pulling force of the first electric cylinder acts on the wind tunnel balance in sequence through the heavy-load elastic element, the light-load isolation sleeve, the guide element, the heavy-load sensor, and the first loading rope). After the heavy-load elastic element returns to the retracted state, as the piston rod of the first electric cylinder continues to extend (i.e., the pulling force of the first electric cylinder continues to decrease), The light-load isolation sleeve will slide away from the first electric cylinder (at this time, the light-load isolation sleeve slides along the guide from the first stop to the second stop, and the light-load elastic element changes from the extended state to the contracted state). At this time, the pulling force of the first electric cylinder acts on the wind tunnel balance in sequence through the heavy-load elastic element, the light-load isolation sleeve, the light-load elastic element, the light-load sensor, the guide, the heavy-load sensor, and the first loading rope. As the light-load isolation sleeve continues to slide, until the other end of the light-load isolation sleeve slides to the second stop, at this time the light-load elastic element is in the contracted state and the pulling force of the first electric cylinder becomes 0. Therefore, the automatic loading rod in this invention has a relatively simple structure and can automatically apply a suitable loading force to the wind tunnel balance. When the loading force is relatively small, the first electric cylinder pulls the light-load elastic element from a contracted state to an extended state or vice versa. As described above, during this stage, the pulling force of the first electric cylinder (i.e., the loading force applied to the wind tunnel balance) sequentially acts on the wind tunnel balance through the heavy-load elastic element, the light-load isolation sleeve, the light-load elastic element, the light-load sensor, the guide element, the heavy-load sensor, and the first loading rope. Therefore, during this stage, the pulling force of the first electric cylinder can be measured by the light-load sensor and simultaneously... The load force is measured by the heavy-load sensor, but considering that the light-load sensor is more accurate when measuring forces within a smaller range, the pulling force of the first electric cylinder is measured by the light-load sensor during this stage. When the load force is large, the first electric cylinder pulls the heavy-load elastic element from a contracted state to an extended state or vice versa. As mentioned above, during this stage, the pulling force of the first electric cylinder (i.e., the load force applied to the wind tunnel balance) acts on the wind tunnel balance sequentially through the heavy-load elastic element, the light-load isolation sleeve, the guide, the heavy-load sensor, and the first loading rope. Therefore, during this stage, only the pulling force of the first electric cylinder can be measured by the heavy-load sensor. Depending on the actual situation, an appropriate load force is applied to the wind tunnel balance by the first electric cylinder, and then the magnitude of the load force is measured by the light-load sensor or the heavy-load sensor. The load force is compared with the force measured by the wind tunnel balance under the action of the load force to determine the accuracy and uncertainty of the wind tunnel balance.As can be seen from the above, the automatic loading rod in this invention can automatically switch between light load (i.e., when the pulling force of the first electric cylinder is small, or in other words, when the loading force applied to the wind tunnel balance is small) and heavy load (i.e., when the pulling force of the first electric cylinder is large, or in other words, when the loading force applied to the wind tunnel balance is large), thereby making the measured loading force more accurate, so as to more accurately determine the performance parameters of the wind tunnel balance. The balance loading vehicle using the above-mentioned automatic loading rod in this invention can adjust the rope height of the automatic loading rod by extending and retracting the second electric cylinder. The angle of the rope in the horizontal direction is adjusted by moving the AGV body. Then, the operator pulls the first loading rope to the stretched state, and then fixes the first loading rope in the stretched state to the wind tunnel balance. Alternatively, the first loading rope can be fixed to the wind tunnel balance first, and then the first loading rope can be stretched by moving the AGV body. Then, the loading force can be applied to the wind tunnel balance by the automatic loading rod.
[0015] The invention will now be further described with reference to the accompanying drawings. Attached Figure Description
[0016] Figure 1 This is a front view of the autoloading lever in this invention;
[0017] Figure 2 This is a top view of the autoloading lever in this invention;
[0018] Figure 3 The three-dimensional representation of the automatic loading rod in this invention Figure 1 ;
[0019] Figure 4 The three-dimensional representation of the automatic loading rod in this invention Figure 2 ;
[0020] Figure 5 The three-dimensional structure of the automatic loading rod hidden behind the top plate in this invention Figure 1 ;
[0021] Figure 6 The three-dimensional structure of the automatic loading rod hidden behind the top plate in this invention Figure 2 ;
[0022] Figure 7 This is a perspective view of the automatic loading rod after concealing the top plate and the light-load isolation sleeve in this invention.
[0023] Figure 8 This is a top view of the automatic loading rod in this invention after the top plate is hidden;
[0024] Figure 9 For along Figure 8 Sectional view of line AA in the middle;
[0025] Figure 10 This is a front sectional view of the automatic loading rod after it is hidden in the top plate (the lightly loaded spring is in the extended state).
[0026] Figure 11 This is a front sectional view of the automatic loading rod in this invention after the top plate is hidden (both the light-load spring and the heavy-load spring are in the extended state).
[0027] Figure 12 This is a front view of the balance loading vehicle in this invention;
[0028] Figure 13 The three-dimensional loading vehicle of the balance in this invention Figure 1 ;
[0029] Figure 14 The three-dimensional loading vehicle of the balance in this invention Figure 2 ;
[0030] Figure 15 The three-dimensional loading vehicle of the balance in this invention Figure 3 (Top plate that hides the autoloading lever);
[0031] Figure 16 The three-dimensional loading vehicle of the balance in this invention Figure 4 (The box containing the hidden weights);
[0032] Figure 17 for Figure 16 A magnified view of a section at point B. Detailed Implementation
[0033] like Figure 1 As shown, and in combination Figure 2-17As shown, the automatic loading rod of the present invention includes a rod body 13. A receiving cavity is provided within the rod body 13 along its length. Within the receiving cavity, a first electric cylinder 26, a heavy-duty elastic element, a light-duty isolation sleeve 23, a guide member, and a heavy-duty sensor 28 are sequentially arranged along the length of the rod body 13. One end of the first electric cylinder 26 is fixedly disposed within the receiving cavity, and the other end of the first electric cylinder 26 is connected to one end of the heavy-duty elastic element. The other end of the heavy-duty elastic element is connected to one end of the light-duty isolation sleeve 23. The other end of the light-duty isolation sleeve 23 is slidably fitted onto the guide member. The guide member is provided with first stops 30 and second stops 22 spaced apart along the length of the rod body 13. The other end of the light-duty isolation sleeve 23 is slidably disposed between the first stops 30 and the second stops 22. The first stop 30 is located inside the light load isolation sleeve 23, and the second stop 22 is located outside the other end of the light load isolation sleeve 23. A light load sensor 31 is connected to the first stop 30. A light load elastic element is connected between the light load sensor 31 and one end of the light load isolation sleeve 23. The light load elastic element is located inside the light load isolation sleeve 23. A heavy load sensor 28 is connected to the second stop 22. The heavy load sensor 28 and the light load isolation sleeve 23 are located on opposite sides of the second stop 22. The heavy load sensor 28 is connected to one end of the first loading rope 10 (a connecting ring 21 is fixedly provided on the heavy load sensor 28, and one end of the first loading rope 10 is fixedly connected to the connecting ring 21). The other end of the first loading rope 10 extends from the receiving cavity to the outside of the rod body 13.
[0034] The rod 13 is rectangular and includes a top plate 15, a bottom plate 16, and vertical plates connecting the top plate 15 and the bottom plate 16. The vertical plates include two side vertical plates 14 arranged along the length of the rod 13 and two end vertical plates 20 arranged at both ends of the rod 13. The top plate 15, the bottom plate 16, and the four vertical plates together form the receiving cavity of the rod 13.
[0035] In the automatic loading rod of this invention, the cylinder body of the first electric cylinder 26 is fixedly disposed within the receiving cavity, and the piston rod of the first electric cylinder 26 is connected to one end of a heavy-duty elastic element. The heavy-duty elastic element is a heavy-duty spring 25, one end of which is connected to the piston rod of the first electric cylinder 26, and the other end of which is connected to one end of a light-duty isolation sleeve 23.
[0036] like Figure 7 As shown, and in combination Figure 8-11As shown, in the automatic loading rod of the present invention, the guide component is a guide post 29, which is arranged along the length direction of the rod body 13. The first stop 30 and the second stop 22 are respectively provided at both ends of the guide post 29. One end of the light load isolation sleeve 23 is fixedly provided with an end cap 24. The other end of the heavy load spring 25 is connected to the outside of the end cap 24. The other end of the light load isolation sleeve 23 is fixedly provided with an annular flange 33 extending into the light load isolation sleeve 23. The annular flange 33 extends between the first stop 30 and the second stop 22. The annular flange 33 is slidably fitted onto the guide post 29 through its central hole. A light load elastic component, which is a light load spring 32, is connected between the light load sensor 31 and the inside of the end cap 24.
[0037] It should be noted that the heavy-load spring 25 and the light-load spring 32 in this embodiment are relative. That is to say, the heavy-load spring 25 requires more force than the light-load spring 32 to stretch the heavy-load spring 25 from the contracted state to the extended state. The specific amount of force required to stretch the light-load spring 32 / heavy-load spring 25 from the contracted state to the extended state can be selected according to the actual situation.
[0038] Regarding the position of the first electric cylinder 26, the first stop block 30 is arranged close to the first electric cylinder 26, and the second stop block 22 is arranged away from the first electric cylinder 26. For example... Figure 9 As shown, and in combination Figure 10 , 11 As shown, the other end of the light-load isolation sleeve 23 is slidably fitted onto the guide post 29 through the center hole on the annular flange 33, and the annular flange 33 extends between the first stop 30 and the second stop 22. In this way, when the other end of the light-load isolation sleeve 23 slides along the guide post 29, when it slides to the first stop 30 / second stop 22, the annular flange 33 can abut against the first stop 30 / second stop 22, so that the light-load isolation sleeve 23 can no longer slide.
[0039] like Figure 7 As shown, and in combination Figure 8-11As shown, when the other end of the light-load isolation sleeve 23 slides along the guide post 29 from the second stop 22 to the first stop 30 (i.e., towards the first electric cylinder 26), the end cap 24 of the light-load isolation sleeve 23 will stretch the light-load spring 32. When the other end of the light-load isolation sleeve 23 abuts against the first stop 30, the end cap 24 stretches the light-load spring 32 from a contracted state to an extended state. Conversely, when the other end of the light-load isolation sleeve 23 slides along the guide post 29 from the first stop 30 to the second stop 22 (i.e., away from the first electric cylinder 26), the force of the end cap 24 of the light-load isolation sleeve 23 stretching the light-load spring 32 will become smaller and smaller. Thus, the light-load spring 32 gradually changes from an extended state to a contracted state. When the other end of the light-load isolation sleeve 23 abuts against the second stop 22, the magnitude of the force of the end cap 24 stretching the light-load spring 32 becomes 0, and the light-load spring 32 changes from an extended state to a contracted state.
[0040] like Figure 1 As shown, and in combination Figure 2-8 As shown, the automatic loading rod of the present invention has a rod body 13 with a strip-shaped sliding hole 12 arranged along the length of the rod body 13. A sliding pin 17 is fixedly provided on the second stop block 22. The sliding pin 17 is inserted into one end of the strip-shaped sliding hole 12 and extends from the receiving cavity through the strip-shaped sliding hole 12 to the outside of the rod body 13. An automatic unloading switch 19 is fixedly provided on the outside of the rod body 13. The automatic unloading switch 19 is arranged near the other end of the strip-shaped sliding hole 12. The automatic unloading switch 19 and the heavy load sensor 28 are respectively located on opposite sides of the second stop block 22. In other words, taking the position of the first electric cylinder 26 as an example, the automatic unloading switch 19 is arranged close to the first electric cylinder 26, and the heavy load sensor 28 is arranged away from the first electric cylinder 26.
[0041] When the sliding pin 17 slides from one end of the strip-shaped sliding hole 12 to the other end, the sliding pin 17 triggers the automatic unloading switch 19, which shuts off the first electric cylinder 26. The automatic unloading switch 19 is a limit switch in the prior art, and its structure and working principle will not be described in detail here.
[0042] like Figure 1 As shown, and in combination Figure 2-11 As shown, in the automatic loading rod of the present invention, a support 11 is fixedly provided at one end of the rod body 13 near the heavy load sensor 28. Two first guide wheels 18 arranged vertically are rotatably mounted on the support 11. The other end of the first loading rope 10 exits from the receiving cavity and passes between the two first guide wheels 18. By setting the first guide wheels 18, the first loading rope 10 can move more smoothly and without obstruction.
[0043] like Figure 12 As shown, and in combination Figure 13-17As shown, the balance loading vehicle using the aforementioned automatic loading rod in this invention includes an AGV body 37, on which a support frame 39 is fixedly mounted. The end of the automatic loading rod near the first electric cylinder 26 is hinged to the upper end of the support frame 39. A second electric cylinder 36 connects the automatic loading rod to the lower end of the support frame 39. The piston rod of the second electric cylinder 36 is hinged to the rod body 13 of the automatic loading rod, and the cylinder body of the second electric cylinder 36 is hinged to the lower end of the support frame 39. When the piston rod of the second electric cylinder 36 extends or retracts, it drives the automatic loading rod to rotate around the upper end of the support frame 39, thereby adjusting the rope extension height of the automatic loading rod.
[0044] In the balance loading vehicle of this invention, a vertical support base 42 is fixedly provided at the upper end of the support frame 39. A second guide wheel 43 is rotatably mounted on the vertical support base 42. A weight box 38 is fixedly provided on the AGV body 37. The weight box 38 and the second electric cylinder 36 are located on opposite sides of the support frame 39, respectively. The weights 48 in the weight box 38 are connected to one end of the second loading rope 34, and the other end of the second loading rope 34 passes around the second guide wheel 43 and exits from the support 11. The end of the automatic loading rod near the first electric cylinder 26 is also hinged to the vertical support base 42 at the upper end of the support frame 39.
[0045] In the balance loading cart of this invention, a horizontal support base 40 is fixedly mounted on the support frame 39. A third guide wheel 41 is rotatably mounted on the horizontal support base 40, and the third guide wheel 41 is located above the weight box 38. The third guide wheel 41 tensions the second loading rope 34 onto the second guide wheel 43. Two fourth guide wheels 35, arranged vertically, are also rotatably mounted on the support 11, and the other end of the second loading rope 34 passes through the two fourth guide wheels 35. The third guide wheel 41 serves to tension the second loading rope 34, that is, it can tension the second loading rope 34 onto the second guide wheel 43. By setting the fourth guide wheels 35, the second loading rope 34 can move more smoothly and without obstruction.
[0046] The balance loading vehicle of this invention includes a weight box 38 comprising a box body. A vertically arranged weight guide post 47 is fixedly installed inside the box body. Multiple block-shaped weights 48 are mounted on the weight guide post 47, arranged vertically. Each weight 48 has a vertical through hole, with the vertical through holes of adjacent weights 48 corresponding vertically. The vertical through holes of the multiple weights 48 together form a vertical cavity. A weight lifting rod 49 is installed inside the vertical cavity. Each weight 48 has a vertical lifting rod 49. A horizontal through hole 45 is connected to the through hole. The weight lifting rod 49 has multiple pin holes along its vertical edge. The multiple pin holes are arranged one-to-one with the horizontal through holes 45 on the multiple weights 48. A weight selection pin 46 is inserted through the horizontal through hole 45 and the corresponding pin hole of one of the multiple weights 48. The upper end of the weight lifting rod 49 is connected to one end of the second loading rope 34. A loading position switch 50 is fixedly installed inside the box. The loading position switch 50 is located above the multiple weights 48.
[0047] The outer side of the weight box 38 is provided with vertically arranged scales 44, which represent the weight of the weight 48 lifted by the weight lifting rod 49 (the weight range of the weight 48 is 1 kg-100 kg). The operator can insert the weight selection pin 46 into the horizontal through hole 45 of the weight 48 at different scales 44 and the pin hole of the weight lifting rod 49 corresponding to the horizontal through hole 45. In this way, when the weight lifting rod 49 is raised, the weight of the weight 48 it lifts is the weight of the selected scale 44.
[0048] When using the automatic loading rod of this invention, the operator first fixes the position of the rod body 13, then pulls the first loading rope 10 to the stretched state, and then fixes the other end of the first loading rope 10 in the stretched state to the wind tunnel balance. Alternatively, the other end of the first loading rope 10 can be fixed to the wind tunnel balance first, and then the rod body 13 can be moved to put the first loading rope 10 in the stretched state (at this time, as long as a pulling force is applied to one end of the first loading rope 10, the pulling force can be applied to the wind tunnel balance through the first loading rope 10). At this time, the first loading rope 10 does not apply tension to the heavy load sensor 28, the piston rod of the first electric cylinder 26 is in the extended state, and both the light load spring 32 and the heavy load spring 25 are in the contracted state (at this time, both the light load spring 32 and the heavy load spring 25 are in the natural contracted state, and the tension acting on the light load spring 32 and the heavy load spring 25 is 0). The other end of the light load isolation sleeve 23 abuts against the second stop 22, and the sliding pin 17 of the second stop 22 is located at one end of the strip-shaped sliding hole 12 (i.e., the end away from the automatic unloading switch 19). Figure 7 , 8As shown in Figure 9, the piston rod of the first electric cylinder 26 is then retracted. Due to errors, such as one end of the first loading rope 10 not being properly connected to the heavy load sensor 28, or the other end of the first loading rope 10 not being properly connected to the wind tunnel balance, when the piston rod of the first electric cylinder 26 retracts, that is, when the first electric cylinder 26 pulls the first loading rope 10 sequentially through the heavy load spring 25, the light load isolation sleeve 23, the light load spring 32, the light load sensor 31, the guide post 29, and the heavy load sensor 28, the first loading rope 10, which was originally in a stretched state, will... It may suddenly become relaxed. In this way, under the pulling action of the first electric cylinder 26, the heavy-load spring 25, the light-load isolation sleeve 23, the light-load spring 32, the light-load sensor 31, the guide post 29 and the heavy-load sensor 28 will pull the first loading rope 10 together to move towards the first electric cylinder 26. At this time, the sliding pin 17 slides from one end of the strip-shaped sliding hole 12 to the other end until the sliding pin 17 slides to the other end of the strip-shaped sliding hole 12. At this time, the sliding pin 17 triggers the automatic unloading switch 19, and the automatic unloading switch 19 closes the first electric cylinder 26.
[0049] Afterwards, the operator needs to check the reason why the first loading rope 10 changed from a stretched state to a slack state. After the fault is eliminated, the piston rod of the first electric cylinder 26 is extended again, and the heavy-load spring 25, light-load isolation sleeve 23, light-load spring 32, light-load sensor 31, guide post 29, and heavy-load sensor 28 are also returned to their original positions. Figure 7 , 8 As shown in Figure 9, the first loading rope 10 is then brought back into a stretched state, and the piston rod of the first electric cylinder 26 is retracted. The first electric cylinder 26 then simultaneously pulls the heavy-load spring 25 and the light-load spring 32 installed in the light-load isolation sleeve 23. Because the initial tension of the first electric cylinder 26 is small, it cannot pull the heavy-load spring 25 from a contracted state to an extended state, but can only pull the light-load spring 32 from a contracted state to an extended state. Therefore, the piston rod of the first electric cylinder 26 pulls the light-load isolation sleeve 23 towards the heavy-load spring 25. The first electric cylinder 26 slides in the direction of the slide (at this time, the light-load isolation sleeve 23 slides along the guide post 29 from the second stop 22 to the first stop 30 and stretches the light-load spring 32). At this time, the pulling force of the first electric cylinder 26 is applied to the wind tunnel balance in sequence through the heavy-load spring 25, the light-load isolation sleeve 23, the light-load spring 32, the light-load sensor 31, the guide post 29, the heavy-load sensor 28, and the first loading rope 10. As the light-load isolation sleeve 23 continues to slide, until the other end of the light-load isolation sleeve 23 slides to the first stop 30 (e.g., ... Figure 10As shown), at this time, the light-load spring 32 is in the extended state, and even if the pulling force of the first electric cylinder 26 increases further, the first electric cylinder 26 cannot continue to pull the light-load isolation sleeve 23 towards the first electric cylinder 26 (that is, the light-load isolation sleeve 23 cannot continue to stretch the light-load spring 32). In other words, at this time, the pulling force of the first electric cylinder 26 is applied to the wind tunnel balance in sequence through the heavy-load spring 25, the light-load isolation sleeve 23, the guide post 29, the heavy-load sensor 28, and the first loading rope 10. As the pulling force of the first electric cylinder 26 continues to increase, the piston rod of the first electric cylinder 26 will pull the heavy-load spring 25 from the contracted state to the extended state (as shown). Figure 11 As shown), the heavy-load spring 25 can be pulled to a suitable extension state depending on the specific situation. The above only describes the situation where the pulling force of the first electric cylinder 26 increases from small to large (during this process, the piston rod of the first electric cylinder 26 gradually retracts). When the pulling force of the first electric cylinder 26 increases from small to large, and then decreases from large to small, the piston rod of the first electric cylinder 26 will gradually extend. First, the heavy-load spring 25 gradually changes from the extended state to the retracted state (during this process, the pulling force of the first electric cylinder 26 acts on the wind tunnel balance in sequence through the heavy-load spring 25, the light-load isolation sleeve 23, the guide post 29, the heavy-load sensor 28, and the first loading rope 10). Figure 10 , 11 As shown, after the heavy-load spring 25 is in the contracted state, as the piston rod of the first electric cylinder 26 continues to extend (i.e., the pulling force of the first electric cylinder 26 continues to decrease), the light-load isolation sleeve 23 will slide away from the first electric cylinder 26 (at this time, the light-load isolation sleeve 23 slides along the guide post 29 from the first stop 30 to the second stop 22, and the light-load spring 32 simultaneously changes from the extended state to the contracted state). At this time, the pulling force of the first electric cylinder 26 acts on the wind tunnel balance in sequence through the heavy-load spring 25, the light-load isolation sleeve 23, the light-load spring 32, the light-load sensor 31, the guide post 29, the heavy-load sensor 28, and the first loading rope 10. As the light-load isolation sleeve 23 continues to slide, until the other end of the light-load isolation sleeve 23 slides to the second stop 22, as shown... Figure 7 , 8 As shown in Figure 9, at this time, the light-load spring 32 is in a contracted state and the tension of the first electric cylinder 26 becomes 0.
[0050] Therefore, the automatic loading rod in this invention has a relatively simple structure and can automatically apply a suitable loading force to the wind tunnel balance. When the loading force is relatively small, the first electric cylinder 26 pulls the light-load spring 32 from a contracted state to an extended state or vice versa. As described above, during this stage, the pulling force of the first electric cylinder 26 (i.e., the loading force applied to the wind tunnel balance) acts on the wind tunnel balance sequentially through the heavy-load spring 25, the light-load isolation sleeve 23, the light-load spring 32, the light-load sensor 31, the guide post 29, the heavy-load sensor 28, and the first loading rope 10. Therefore, during this stage, the pulling force of the first electric cylinder 26 can be measured by the light-load sensor 31 and can also be measured by the heavy-load sensor 38. Sensor 28 measures the force, but considering that the light-load sensor 31 is more accurate when measuring forces within a smaller range, the pulling force of the first electric cylinder 26 is measured by the light-load sensor 31 during this stage. When the loading force is large, the first electric cylinder 26 pulls the heavy-load spring 25 from a contracted state to an extended state or vice versa. As mentioned above, during this stage, the pulling force of the first electric cylinder 26 (i.e., the loading force applied to the wind tunnel balance) acts on the wind tunnel balance sequentially through the heavy-load spring 25, the light-load isolation sleeve 23, the guide column 29, the heavy-load sensor 28, and the first loading rope 10. Therefore, during this stage, the pulling force of the first electric cylinder 26 can only be measured by the heavy-load sensor 28. Depending on the actual situation, a suitable loading force is applied to the wind tunnel balance by the first electric cylinder 26, and then the loading force is measured by the light-load sensor 31 or the heavy-load sensor 28. The loading force is compared with the force measured by the wind tunnel balance under the action of the loading force to determine the accuracy and uncertainty of the wind tunnel balance. As can be seen from the above, the automatic loading rod in this invention can automatically switch between light load (i.e., when the pulling force of the first electric cylinder 26 is small, or in other words, when the loading force applied to the wind tunnel balance is small, the light load range is 1 kg-15 kg with an accuracy of 0.01 kg) and heavy load (i.e., when the pulling force of the first electric cylinder 26 is large, or in other words, when the loading force applied to the wind tunnel balance is large, the heavy load range is 15 kg-100 kg with an accuracy of 0.05 kg), thereby making the measured loading force more accurate, so as to more accurately determine the performance parameters of the wind tunnel balance.
[0051] like Figure 12 As shown, and in combination Figure 13-17As shown, the balance loading vehicle using the above-mentioned automatic loading rod in this invention can adjust the rope height of the automatic loading rod by extending and retracting the second electric cylinder 36. The angle of the rope in the horizontal direction can be adjusted by moving the AGV body 37. Then, the operator pulls the first loading rope 10 to the stretched state and then fixes the first loading rope 10 in the stretched state to the wind tunnel balance. Alternatively, the first loading rope 10 can be fixedly connected to the wind tunnel balance first, and then the first loading rope 10 can be stretched by moving the AGV body 37. Then, the loading force can be applied to the wind tunnel balance by the automatic loading rod.
[0052] The balance loading vehicle can also manually load the wind tunnel balance. First, the height of the automatic loading rod's rope is adjusted by extending and retracting the second electric cylinder 36. The horizontal angle of the rope is adjusted by moving the AGV body 37. Then, the operator pulls the second loading rope 34 to the stretched state. The other end of the stretched second loading rope 34 is then fixedly connected to the wind tunnel balance. Alternatively, the other end of the second loading rope 34 can be fixed to the wind tunnel balance first, and then the AGV body 37 can be moved to stretch the second loading rope 34 (at this point, applying tension to one end of the second loading rope 34 will apply the tension to the wind tunnel balance). At this time, the second loading rope 34 does not apply tension to the weight 48. Then, the weight selection pin 46 is inserted into the transverse through-hole 45 of the weight 48 at the selected scale 44, along with the corresponding weight. The weight 48, which is inserted into the weight selection pin 46 and the weight 48 on top of it, is fixed to the weight lifting rod 49 and can move with it. Then, the AGV body 37 is moved away from the wind tunnel balance until one end of the second loading rope 34 lifts the weight lifting rod 49 and the weight 48 fixed thereon (the lifted weight 48 slides upward along the weight guide post 47). At this time, the weight of the lifted weight 48 has been applied to the wind tunnel balance through the second loading rope 34. As the AGV body 37 continues to move, the lifted weight 48 will continue to move upward until it contacts the loading position switch 50 and triggers it. Then, the loading position switch 50 sends a signal to the AGV body 37, and the AGV body 37 stops moving, completing the manual loading. As described above, the weight 48 lifted by the weight lifting rod 49 is applied to the wind tunnel balance through the second loading rope 34. The weight of the lifted weight 48 is the magnitude of the loading force. The loading force is compared with the force measured by the wind tunnel balance under the action of the loading force to determine the performance parameters such as the accuracy and uncertainty of the wind tunnel balance.
[0053] The load-in switch 50 is a limit switch in the prior art, and its structure and working principle will not be described in detail here.
[0054] Therefore, when the balance loading vehicle is used, the wind tunnel balance can be automatically loaded by the automatic loading rod, or it can be manually loaded by the weight box 38. Of course, only one loading method needs to be selected when loading.
[0055] It should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.
[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0057] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims
1. An automatic loading lever, characterized in that: The rod includes a rod body with a receiving cavity arranged along its length. Within the receiving cavity, a first electric cylinder, a heavy-duty elastic element, a light-duty isolation sleeve, a guide element, and a heavy-duty sensor are sequentially arranged along the length of the rod body. One end of the first electric cylinder is fixed within the receiving cavity, and the other end is connected to one end of the heavy-duty elastic element. The other end of the heavy-duty elastic element is connected to one end of the light-duty isolation sleeve. The other end of the light-duty isolation sleeve is slidably fitted onto the guide element. The guide element has first and second stops arranged at intervals along the length of the rod body. The other end of the light-duty isolation sleeve... The rod is slidably positioned between a first stop and a second stop. The first stop is located inside a light-load isolation sleeve, and the second stop is located outside the other end of the light-load isolation sleeve. A light-load sensor is connected to the first stop, and a light-load elastic element is connected between the light-load sensor and one end of the light-load isolation sleeve. The light-load elastic element is located inside the light-load isolation sleeve. A heavy-load sensor is connected to the second stop, and the heavy-load sensor and the light-load isolation sleeve are located on opposite sides of the second stop. The heavy-load sensor is connected to one end of a first loading rope, and the other end of the first loading rope extends from the receiving cavity to the outside of the rod. The guide component is a guide post, which is arranged along the length of the rod. The first stop and the second stop are respectively located at both ends of the guide post. One end of the light-load isolation sleeve is fixedly provided with an end cap. The other end of the heavy-load elastic component is connected to the outside of the end cap. The other end of the light-load isolation sleeve is fixedly provided with an annular flange extending into the light-load isolation sleeve. The annular flange extends between the first stop and the second stop. The annular flange is slidably fitted onto the guide post through its central hole.
2. The automatic loading lever according to claim 1, characterized in that: The cylinder body of the first electric cylinder is fixedly installed in the receiving cavity, and the piston rod of the first electric cylinder is connected to one end of the heavy-duty elastic element.
3. The automatic loading lever according to claim 2, characterized in that: The heavy-duty elastic element is a heavy-duty spring. One end of the heavy-duty spring is connected to the piston rod of the first electric cylinder, and the other end of the heavy-duty spring is connected to one end of the light-duty isolation sleeve.
4. The automatic loading lever according to claim 3, characterized in that: A light-load elastic element, which is a light-load spring, is connected between the light-load sensor and the inner side of the end cap.
5. The automatic loading lever according to claim 4, characterized in that: The rod body is provided with a strip-shaped sliding hole arranged along the length of the rod body. A sliding pin is fixedly provided on the second stop block. The sliding pin is inserted into one end of the strip-shaped sliding hole. The sliding pin extends from the receiving cavity through the strip-shaped sliding hole to the outside of the rod body. An automatic unloading switch is fixedly provided on the outside of the rod body. The automatic unloading switch is arranged near the other end of the strip-shaped sliding hole. The automatic unloading switch and the heavy load sensor are located on opposite sides of the second stop block.
6. The automatic loading lever according to claim 5, characterized in that: A support is fixedly provided at one end of the rod near the heavy-load sensor. Two first guide wheels arranged vertically are rotatably mounted on the support. The other end of the first loading rope comes out of the receiving cavity and passes between the two first guide wheels.
7. A balance loading vehicle using the automatic loading lever according to any one of claims 1-6, characterized in that: The system includes an AGV body, on which a support frame is fixedly mounted. The end of the automatic loading rod near the first electric cylinder is hinged to the upper end of the support frame. A second electric cylinder is connected between the automatic loading rod and the lower end of the support frame. The piston rod of the second electric cylinder is hinged to the rod body of the automatic loading rod, and the cylinder body of the second electric cylinder is hinged to the lower end of the support frame.
8. The balance loading vehicle according to claim 7, characterized in that: A vertical support base is fixedly provided at the upper end of the support frame. A second guide wheel is rotatably installed on the vertical support base. A weight box is fixedly provided on the AGV body. The weight box and the second electric cylinder are located on opposite sides of the support frame. The weights in the weight box are connected to one end of the second loading rope. The other end of the second loading rope passes around the second guide wheel and then passes out from the support.
9. The balance loading vehicle according to claim 8, characterized in that: A horizontal support base is also fixedly installed on the support frame. A third guide wheel is rotatably installed on the horizontal support base. The third guide wheel is located above the weight box. The third guide wheel tensions the second loading rope on the second guide wheel. Two fourth guide wheels arranged vertically are also rotatably installed on the support. The other end of the second loading rope passes through the two fourth guide wheels.
10. The balance loading vehicle according to claim 9, characterized in that: The weight box includes a box body, inside which a vertically arranged weight guide post is fixedly installed. Multiple block-shaped weights are mounted on the weight guide post, arranged vertically. Each weight has a vertical through hole, with the vertical through holes of adjacent weights corresponding vertically. The vertical through holes of the multiple weights together form a vertical cavity. A weight lifting rod is installed within the vertical cavity. Each weight has a horizontal through hole communicating with the vertical through hole. The weight lifting rod has multiple pin holes along its vertical direction, with each pin hole corresponding to a horizontal through hole on one of the weights. A weight selection pin is inserted through the horizontal through hole and the corresponding pin hole of one of the weights. The upper end of the weight lifting rod is connected to one end of a second loading rope. A loading position switch is fixedly installed inside the box, located above the multiple weights.