Testing system for lifting device

Abstract

The invention relates to the field of hydraulic mechanism testing, and discloses a test system for a lifting device, which comprises a test box body, a test platform, a test platform and a test platform, and is characterized in that one side of the test box body is provided with a side opening; the two protection plates are arranged in the side edge opening and can slide to seal the side edge opening; the mechanical balancing weight is introduced to load step by step, and the problems that a hydraulic system is sensitive to environmental conditions, and pressure adjustment is difficult to stabilize are solved. Through the arrangement of the jacking table, the automatic locking part and the protection plate, the dynamic and static loads of the lifting device are accurately tested, and the hysteresis effect of a hydraulic system under high-frequency change is effectively avoided. The use of the mechanical balancing weight provides higher stability and accuracy, ensures the reliability of the test result, and can comprehensively evaluate the performance of the lifting device under complex working conditions. According to the design method, more accurate test data can be provided, so that a more scientific and reliable basis is provided for optimization and security application of the system.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic mechanism testing, and in particular to a testing system for a lifting device. Background Art

[0002] In the field of modern engineering, shelter structures are widely used in emergency rescue, medical support, military command and other scenarios. In order to ensure the efficiency of the movement and deployment of shelters, it is usually necessary to use a lifting device to lift the shelter. The performance of the lifting device, especially its load-bearing capacity, is directly related to the safety and stability of the shelter during transportation, installation and use.

[0003] The hydraulic lifting platform is one of the most common shelter lifting systems. It uses a hydraulic drive system to lift or lower the shelter vertically. However, in actual use, the load capacity of the lifting device is affected by many factors, including the stability of the hydraulic system, the structural strength of the load-bearing platform, and the system's responsiveness under different load conditions. Therefore, before the lifting device is put into use, load testing and inspection are required to ensure that it can work stably and safely within the rated load range.

[0004] In the prior art, another hydraulic mechanism for testing is usually used to perform load tests on the lifting device. Although the hydraulic mechanism can simulate a variety of load conditions, it may be subject to certain limitations when dealing with rapidly changing loads. When adjusting the pressure, the hydraulic system is sensitive to environmental conditions such as temperature and humidity, and pressure fluctuations may occur, making it difficult for the system to fully evaluate the performance of the lifting device under complex working conditions. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a testing system for a lifting device, aiming to alleviate the above problems at least to a certain extent.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: A test system for a lifting device, comprising: A test box, wherein one side of the test box is provided with a side opening; Two protective plates are arranged in the side opening, and the two protective plates can slide to close the side opening; A frame disposed on the top of the test box, wherein a plurality of counterweights are disposed on the frame; A positioning frame provided in the test box, used for preliminarily positioning the position of the test piece, the positioning frame is provided with two positioning rods, which can slide on the positioning frame; A top pressing platform is arranged in the test box, and its bottom is in contact with the lifting end of the test piece; A moving component provided on the frame is used to move the counterweight block laterally. The multiple counterweight blocks move in sequence from bottom to top. When one of the counterweight blocks moves to a predetermined position, the moving component stops the movement of the counterweight block and triggers the adjacent upper counterweight block to start moving. A locking component provided between the pressing platform and the positioning rod, used for moving the position of the positioning rod when the pressing platform moves upward to a predetermined position; A closing component provided between the protective plate and the pressing platform, used for moving the position of the protective plate when the pressing platform moves upward to a predetermined position; Wherein, the moving component can move the position of the counterweight block when the pressing platform moves upward to a predetermined position, and the moving component can reset the position of the counterweight block when the pressing platform leaves the predetermined position.

[0007] Preferably, the moving component includes a plurality of first screw rods arranged on the frame body, a slider being threadedly connected to the first screw rod, the slider corresponding to the position of the counterweight block, the two ends of the lowest first screw rod are respectively connected to the first gear and the second gear, and the two ends of the remaining first screw rods are respectively connected to the third gear adapted to the first gear and the fourth gear meshing with the second gear.

[0008] Preferably, a rotating groove is provided on the inner walls of the first gear, the second gear, the third gear and the fourth gear, a connecting ring is connected to the first screw rod, and the connecting ring is rotatably sleeved in the rotating groove, a plurality of connecting grooves are provided on the outer wall of the connecting ring, a push rod is slidably connected in the connecting groove, a first spring is connected between the push rod and the connecting groove, a plurality of top grooves corresponding to the push rod are provided on the inner wall of the rotating groove, the top groove is hemispherical groove, and one end of the push rod and the top groove sleeve is hemispherical, wherein a ratchet mechanism is provided between the connecting ring in the second gear and the first screw rod, and a ratchet mechanism is also provided between the connecting ring in the fourth gear and the first screw rod.

[0009] Preferably, a plurality of connecting rods are slidably connected to the frame body, the top of the connecting rod is rotatably connected to a first screw rod adjacent to the top, and the bottom of the connecting rod is sleeved with a first screw rod adjacent to the bottom. Corresponding to the position of the slider, two limit rings are connected to the first screw rod for limiting the moving position of the slider, and a second spring is connected between the connecting rod and the frame body.

[0010] Preferably, the test box body is provided with a connecting opening, a motor is slidably connected to the connecting opening, a first transmission gear is connected to the driving shaft of the motor, a connecting cavity is provided in the connecting opening, a support rod connected to the motor is slidably connected to the connecting cavity, a third spring is connected between the support rod and the connecting cavity, a top contact rod extending into the test box body is connected to the bottom of the support rod, a transmission shaft is connected to the test box body, a second transmission gear meshing with the first transmission gear is connected to the transmission shaft, a third transmission gear is rotatably connected to the test box body and meshes with the second gear, and a chain transmission mechanism is connected between the transmission shaft and the third transmission gear.

[0011] Preferably, an oblique opening is provided on one side of the frame.

[0012] Preferably, one side of the sliding block is connected to a limiting bar, and one side of the counterweight block is provided with a limiting groove slidably connected to the limiting bar.

[0013] Preferably, the locking component includes a connecting rod rotatably connected to the positioning rod, the bottom of the pressing platform is connected to a connecting shaft rotatably connected to the connecting rod, and a fourth spring is connected between the positioning rod and the positioning frame.

[0014] Preferably, the closing component comprises a second screw rod rotatably connected to the test box body, and the protective plate is threadedly connected to the second screw rod.

[0015] Preferably, the closing component further comprises a rack connected to the connecting shaft, and the second screw rod is connected to a fifth gear meshing with the rack. In summary, the present invention mainly has the following beneficial effects: 1. Accurate load simulation and testing: By setting the positioning frame, the hydraulic lifting mechanism can be stable and centered in the test box, ensuring that the lifting end corresponds to the center position of the bottom of the top pressure table, ensuring uniform application of force during the load test, and avoiding eccentric load problems.

[0016] The method of loading the counterweight blocks step by step can accurately test the working performance of the hydraulic lifting mechanism under different loads, ensuring its stable and safe operation within the rated load range, overcoming the limitations of traditional hydraulic mechanisms in load testing.

[0017] 2. Improve the stability and consistency of testing: The movement and loading process of the mechanical counterweight has higher stability and accuracy, avoiding the test result errors caused by environmental factors such as temperature and humidity in the hydraulic system, ensuring the consistency and reliability of tests under various environmental conditions.

[0018] By gradually increasing the counterweight, we can simulate complex load conditions that are closer to the actual use environment, flexibly adjust the movement speed and loading rhythm of the counterweight, and comprehensively evaluate the performance of the hydraulic lifting device under dynamic and static loads.

[0019] 3. Performance under dual test conditions: By setting up the top pressure table, the performance of the lifting device under both dynamic lifting and static load conditions can be covered in one test. The buffering effect of the top pressure table can effectively protect the counterweight and other components inside the test box, reducing secondary damage caused by lifting device failure.

[0020] The movement of the counterweight starts after the top press table is stable, which can simulate the pressure increase under static load and evaluate the load capacity and structural stability of the lifting device under long-term static load conditions.

[0021] 4. Security and protection functions: The top pressure table provides an additional buffer layer for the lifting device. If the lifting device is accidentally damaged during the test, it can reduce the direct impact of the counterweight on the damaged lifting device, protect the integrity of the system, and reduce the potential risk of secondary damage.

[0022] The locking component can automatically adjust the positioning rod when the top pressure table moves upward to a predetermined position, accurately fix the lifting device, and ensure its stability during the test and the accuracy of the test results.

[0023] 5. Automation and easy operation: The movement of the protective plate is synchronized with the lifting and lowering of the top pressure table, which can effectively close the side opening, prevent accidental damage during the test and foreign objects from entering the test area, reduce operational risks, and improve test accuracy.

[0024] The sealing process of the protective plate is completed automatically, which simplifies the operation process, reduces manual intervention, and improves the efficiency and stability of the test.

[0025] The present invention addresses the limitations of hydraulic mechanisms in the prior art in load testing, such as the problem of pressure fluctuations when dealing with rapidly changing loads. The present invention overcomes the problems of the hydraulic system being sensitive to environmental conditions and the difficulty in stabilizing pressure regulation by introducing a gradual loading method using a mechanical counterweight. By providing a top pressure platform, an automatic locking component, and a protective plate, the present invention not only achieves accurate testing of the dynamic and static loads of the lifting device, but also effectively avoids the hysteresis effect of the hydraulic system under high-frequency changes. The use of mechanical counterweights provides higher stability and accuracy, ensures the reliability of the test results, and can comprehensively evaluate the performance of the lifting device under complex working conditions. This design method can provide more accurate test data, thereby providing a more scientific and reliable basis for system optimization and safe application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the test box structure of the present invention; Figure 3 It is a schematic diagram of the structure of the top pressing platform of the present invention; Figure 4 It is a schematic diagram of the support rod structure of the present invention; Figure 5 It is a schematic diagram of the structure of the slider of the present invention; Figure 6 is a schematic diagram of the first gear structure of the present invention; Figure 7 It is a schematic diagram of the connecting ring structure of the present invention; Figure 8 yes Figure 2 A schematic diagram of the enlarged local structure at point A in the middle; Fig. 9 It is a schematic diagram of the structure of the closing component of the present invention; Fig.10 It is a schematic diagram of the structure of the counterweight block of the present invention; Fig.11 It is a schematic diagram of the positioning frame structure of the present invention.

[0027] Reference numerals: 100, test box; 101, side opening; 102, protective plate; 103, frame; 104, counterweight; 105, positioning frame; 106, positioning rod; 107, top pressure platform; 200, first screw rod; 201, slider; 202, first gear; 203, second gear; 204, third gear; 205, fourth gear; 206, rotating groove; 207, connecting ring; 208, connecting groove; 209, push rod; 210, first spring; 211, top groove; 212, ratchet mechanism; 213, connecting rod; 214, limiting ring; 215, second spring; 216, connecting opening; 217, motor; 218, first transmission gear; 219, connecting cavity; 220, supporting rod; 221, third spring; 222, top contact rod; 223, transmission shaft; 224, second transmission gear; 225, third transmission gear; 226, chain transmission mechanism; 227, oblique opening; 228, limiting strip; 229, limiting groove; 300, connecting rod; 301, connecting shaft; 302, fourth spring; 400, second screw rod; 401, rack; 402, fifth gear. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] refer to Figure 1-Figure 11 , a test system for a lifting device, comprising: A test box 100, with a side opening 101 formed on one side of the test box 100; Two protective plates 102 are arranged in the side opening 101, and the two protective plates 102 can slide to close the side opening 101; A frame 103 is disposed on the top of the test box 100, and a plurality of counterweights 104 are disposed on the frame 103; A positioning frame 105 disposed in the test box 100 is used to preliminarily position the test piece. Two positioning rods 106 are disposed on the positioning frame 105 and can slide on the positioning frame 105; A top pressing platform 107 is provided in the test box 100, and its bottom contacts the lifting end of the test piece; The moving component provided on the frame 103 is used to move the counterweight block 104 laterally. The multiple counterweight blocks 104 move in sequence from bottom to top. When one of the counterweight blocks 104 moves to a predetermined position, the moving component stops the movement of the counterweight block 104 and triggers the counterweight block 104 above to start moving. A locking component provided between the pressing platform 107 and the positioning rod 106, used to move the position of the positioning rod 106 when the pressing platform 107 moves upward to a predetermined position; A closing member disposed between the protective plate 102 and the pressing platform 107, used to move the position of the protective plate 102 when the pressing platform 107 moves upward to a predetermined position; The moving component can move the position of the counterweight 104 when the pressing platform 107 moves upward to a predetermined position, and the moving component can reset the position of the counterweight 104 when the pressing platform 107 leaves the predetermined position; By setting the positioning frame 105, the lifting device that needs to be tested, such as the hydraulic lifting mechanism, can be stored in the test box 100 through the side opening 101. The set positioning frame 105 can ensure that the position of the hydraulic mechanism in the test box 100 is stable and centered. The positioning frame 105 performs preliminary positioning on the hydraulic mechanism to ensure that the lifting end of the hydraulic mechanism can correspond to the center position of the bottom of the top pressure platform 107, thereby ensuring uniform application of force during the load test and avoiding eccentric load problems caused by inaccurate positioning. During the test, the hydraulic mechanism can be started so that its telescopic end touches the top pressure platform 107 to move it upward and flush with the bottom of the frame 103. When the top pressure platform 107 moves upward to a predetermined position, the set moving component can laterally move the counterweight block 104 located on the frame 103, and multiple counterweight blocks 104 slide in sequence from bottom to top. When one of the counterweights 104 moves to a predetermined position, the moving component will automatically stop the movement of the counterweight 104 and trigger the adjacent upper counterweight 104 to start moving, thereby gradually increasing the load to simulate the working conditions under different load conditions. Through this step-by-step loading method, the working performance of the hydraulic lifting mechanism under different loads can be accurately tested to ensure that it can operate stably and safely within the rated load range. The present invention adopts a step-by-step loading method of the mechanical counterweight 104 to overcome the limitations of traditional hydraulic mechanisms in load testing. Compared with the hydraulic system that is easily affected by environmental factors such as temperature and humidity, the movement and loading process of the mechanical counterweight 104 has higher stability and accuracy, and can better simulate the load conditions under complex working conditions. In addition, mechanical counterweight loading does not rely on the pressure regulation of the hydraulic system, avoiding the test result error caused by hydraulic pressure fluctuations, ensuring the consistency and reliability of the test under various environmental conditions. By gradually increasing the counterweight, the test system can accurately test the performance of the hydraulic lifting device at different load levels, especially under rapidly changing load conditions. The system can flexibly adjust the moving speed and loading rhythm of the counterweight block 104 to simulate complex load conditions that are closer to the actual use environment. This mechanical load-bearing test method not only avoids the hysteresis effect of the hydraulic system under high-frequency changes, thereby comprehensively evaluating its performance under extreme conditions. The test system of the present invention effectively overcomes the limitations of the prior art, and can perform comprehensive and accurate load-bearing capacity tests on hydraulic lifting devices under different complex conditions, ensuring the reliability of the test results, and providing a safer and more scientific basis for the use of subsequent systems.

[0030] Furthermore, a top pressure platform 107 is added between the counterweight 104 and the lifting mechanism, and the top pressure platform 107 can also provide a part of the pressure for the lifting device. In this way, the lifting device not only bears the vertical load from the counterweight 104, but also can achieve a more uniform pressure distribution through the top pressure platform 107. The lifting end of the lifting device passes through the top pressure platform 107, which can simulate the state of the lifting device during the actual lifting operation. The lifting end of the lifting device touches the top pressure platform 107 and moves upward, simulating its dynamic response under load, and can test the stability and carrying capacity of the lifting device under dynamic load to ensure that it can stably and efficiently complete the lifting task in actual operation. The counterweight 104 starts to move when the top pressure platform 107 moves to the predetermined position, which can simulate the pressure increase when the lifting device is in a static state in actual work. After the top pressure platform 107 completes the lifting action and stabilizes, the counterweight block 104 gradually moves to the top of the top pressure platform 107 to simulate the pressure increase under static load. This can evaluate the load capacity and structural stability of the lifting device in a static state and ensure its performance under long-term static load conditions. This design can cover the performance of the lifting device under both dynamic lifting and static load conditions in one test, providing more comprehensive evaluation data. By testing the dynamic and static load conditions separately, possible problems that may arise in the lifting device under different working conditions can be discovered, thereby making targeted optimizations and improvements to ensure that the lifting device can operate stably and safely in actual applications, whether under dynamic lifting or static load conditions, thereby improving the overall reliability and safety of the system. This dual testing method effectively simulates the different load states of the lifting device in actual applications, provides comprehensive data support, and helps to optimize the performance of the lifting device during the design and production process.

[0031] In addition, a pressing platform 107 is provided between the counterweight 104 and the lifting device, and another purpose is to effectively protect the counterweight 104 and other components inside the test box 100 if an accidental damage occurs during the test of the lifting device. The pressing platform 107 can provide an additional buffer layer for the lifting device to reduce the direct impact of the impact force generated when the lifting device fails or is accidentally damaged on the counterweight 104 and the test box 100. This buffering effect can effectively reduce potential damage and protect the integrity of the system. The pressing platform 107, as an additional protective layer, can play a protective role when the lifting device is abnormal and prevent damage to other parts of the system. This design can reduce the potential safety hazards that may be caused by system damage, ensure the safety of the test operation, and prevent the counterweight 104 from directly smashing the damaged lifting device when the lifting device fails. This buffering effect can reduce further damage to the lifting device. The top pressure platform 107 serves as an intermediate layer to isolate the load applied by the counterweight block 104, prevent these loads from directly acting on the damaged lifting device, and reduce the potential risk of secondary damage. In short, by setting up the top pressure platform 107, the counterweight block 104 can be effectively prevented from causing further damage to the lifting device when it is accidentally damaged, thereby protecting the integrity of the lifting device and other test systems and improving the safety and stability of the test process.

[0032] Furthermore, a locking component is provided, which can move the position of the positioning rod 106 when the top pressing platform 107 moves upward to a predetermined position. When the positioning rod 106 moves to the predetermined position, the lifting device can be repositioned. Specifically, when the top pressing platform 107 moves upward and reaches the predetermined position, the locking component will start and automatically move the positioning rod 106 to a new position. This adjustment ensures that the position of the lifting device is accurately aligned when the top pressing platform 107 is stationary. The function of the locking component is to perform secondary positioning, further ensuring that the position of the lifting device is stable during the test. This secondary positioning can correct the possible errors in the initial positioning, thereby improving the accuracy of the test. Through secondary positioning, the slight deviation that may occur during the initial positioning of the lifting device can be eliminated. Ensure that the lifting end of the lifting device is always aligned with the center position of the top pressing platform 107 to avoid uneven load or test errors caused by position offset. Accurate secondary positioning can better simulate the state of the lifting device in actual use, ensure that the test results can accurately reflect the performance of the lifting device under actual working conditions, and the automatic adjustment function of the locking component reduces the complexity and error of manual operation, and improves the efficiency and reliability of the test. After the top-pressing platform 107 is moved to the predetermined position, the operator can automatically complete the positioning process without manual adjustment, which improves the convenience of work. Moreover, after the lifting end of the lifting device contacts the top-pressing platform 107 and the top-pressing platform 107 is moved to the predetermined position, the locking component will accurately adjust the positioning rod 106 and fix the lifting device to ensure that it is stable during the entire test process. This ensures that the pressure applied during the test is evenly and reliably transmitted to the lifting device. In summary, the set locking component can accurately fix the lifting device to ensure that it is stable during the test process, improve the accuracy and reliability of the test, and provide a solid technical foundation for subsequent system applications.

[0033] Furthermore, two protective plates 102 are arranged in the side opening 101, and the protective plates 102 can move when the pressing platform 107 moves upward to a predetermined position. The two protective plates 102 can contact each other when they move to the predetermined position. At this time, the two protective plates 102 will contact and completely close the side opening 101. The movement and contact of the protective plates 102 can effectively close the side opening 101, prevent accidental damage to the test piece components during the test, reduce operational risks, and ensure the safety of operators. The closed side opening 101 can prevent foreign objects from entering the test area and avoid external factors from interfering with the test results, thereby improving the accuracy of the test. The movement of the protective plates 102 is synchronized with the lifting and lowering of the pressing platform 107, which simplifies the operating process and makes the closing process of the protective plates 102 automatic, reduces manual intervention, and improves the efficiency and stability of the test.

[0034] As a further solution of the present invention, the moving component includes a plurality of first screw rods 200 arranged on the frame 103, the first screw rods 200 are threadedly connected with a slider 201, the slider 201 corresponds to the position of the counterweight 104, the two ends of the lowest first screw rod 200 are respectively connected with a first gear 202 and a second gear 203, and the two ends of the remaining first screw rods 200 are respectively connected with a third gear 204 adapted to the first gear 202 and a fourth gear 205 meshing with the second gear 203; By setting the first gear 202 and the third gear 204, in the initial state, the first gear 202 is not meshed with the third gear 204, and the second gear 203 is meshed with the fourth gear 205. When the counterweight 104 is moved, the first screw rod 200 at the bottom can be rotated, and the slider 201 on the first screw rod 200 at the bottom moves, and drives the counterweight 104 at the bottom to move, and stops moving when it moves to the middle position above the top pressure block. At this time, the first screw rod 200 at the top moves, so that the third gear 204 on it is meshed with the first gear 202, and the second gear 203 is disengaged from the fourth gear 205. Then, the slider 201 on the first screw rod 200 at the top will start to move and drive the corresponding counterweight 104 to move. Since the third gear 204 is meshed with the first gear 202, the rotation of the moving part will drive the counterweight 104 at the top to move step by step. When the counterweight 104 moves to its predetermined position, the first screw rod 200 adjacent to the upper part moves, and the third gear 204 on it meshes with the third gear 204 below. This design realizes the step-by-step loading of the counterweight 104. By moving the first screw rod 200 each time, the gear meshing state on it is adjusted and the first screw rod 200 is rotated. The slider 201 of each first screw rod 200 drives the corresponding counterweight 104 to move when rotating, and its position is accurately controlled by the gear meshing mechanism. This design ensures the accurate loading of the counterweight 104 at different positions, so that the working conditions under different load conditions can be simulated, and the accuracy and reliability of the test can be improved. In addition, by adjusting the rotation speed state of the first screw rod 200 at the bottom, the moving speed of the counterweight 104 can be flexibly controlled to meet different test requirements.

[0035] As a further solution of the present invention, the inner walls of the first gear 202, the second gear 203, the third gear 204 and the fourth gear 205 are provided with a rotating groove 206, the first screw rod 200 is connected with a connecting ring 207, the connecting ring 207 is rotatably sleeved in the rotating groove 206, the outer wall of the connecting ring 207 is provided with a plurality of connecting grooves 208, a push rod 209 is slidably connected in the connecting groove 208, a first spring 210 is connected between the push rod 209 and the connecting groove 208, the inner wall of the rotating groove 206 is provided with a plurality of top grooves 211 corresponding to the push rod 209, the top groove 211 is a semi-spherical groove, and one end of the push rod 209 and the top groove 211 sleeved is semi-spherical, wherein a ratchet mechanism 212 is provided between the connecting ring 207 in the second gear 203 and the first screw rod 200, and a ratchet mechanism 212 is also provided between the connecting ring 207 in the fourth gear 205 and the first screw rod 200; By setting a plurality of first screw rods 200, the threads on the plurality of first screw rods 200 have different directions, so as to ensure that the slider 201 can move in the same direction when the gears are meshed and transmitted. Specifically, when the first gear 202 rotates counterclockwise, the slider 201 is moved to the right by the first screw rod 200, so that the counterweight block 104 is moved to the right to the middle position of the top of the top pressure block. When the first screw rod 200 at the bottom rotates counterclockwise, the setting of the ratchet mechanism 212 can make the first screw rod 200 idle inside the connecting ring 207 in the second gear 203 without affecting other When the first screw rod 200 rotates counterclockwise to allow the slider 201 to drive the counterweight 104 to move to a predetermined position, the first screw rod 200 adjacent to the upper side is displaced to allow the third gear 204 to mesh with the first gear 202. The first screw rod 200 is set by the ratchet mechanism 212 to idle in the fourth gear 205 and the connecting ring 207 without affecting other components. By analogy, it can be ensured that while the position of the slider 201 is effectively moved in the same direction, the problem of motion interference is avoided. The fourth gear 205 is set to facilitate the subsequent reset of the first screw rod 200 in a straight line. After that, the second gear 203 is rotated clockwise to reset all the sliders 201 and the counterweight 104. In addition, the first spring 210 can give a certain force to the push rod 209, so that the push rod 209 can be sleeved with the top groove 211 and generate a certain friction force. When the slider 201 has not moved to the limit position, the friction force between the push rod 209 and the top groove 211 can be used to effectively transmit the rotation of the corresponding gear. When the slider 201 moves to the limit position, the rotation of the first screw rod 200 is restricted. At this time, the rotation of the gear can overcome the force of the first spring 210, so that the push rod 209 can be sleeved with the top groove 211 and generate a certain friction force. 09 is disengaged from the top groove 211, and the gear can idle outside the first screw rod 200. This design can ensure that when one of the sliders 201 moves to the extreme position, it can continue to drive the rotation of other gears, so that the remaining counterweight block 104 can be displaced to the predetermined position. This design can not only gradually and accurately load and release the counterweight block 104 during the test, but also achieve stable control of the counterweight block 104 and automatic operation of sequential loading and resetting through the clever coordination of gears, screws and ratchet mechanisms 212, thereby improving the overall efficiency and reliability of the test device. The setting of different thread directions and ratchet mechanisms 212 further avoids interference problems of the counterweight block 104 during operation, ensures the coordination and controllability of the entire test system, and meets the requirements for accurate load simulation and evaluation under complex working conditions.

[0036] As a further solution of the present invention, a plurality of connecting rods 213 are slidably connected to the frame 103, the top of the connecting rod 213 is rotatably connected to a first screw rod 200 adjacent to the top, and the bottom of the connecting rod 213 is sleeved with a first screw rod 200 adjacent to the bottom. Corresponding to the position of the slider 201, two limiting rings 214 are connected to the first screw rod 200 for limiting the moving position of the slider 201, and a second spring 215 is connected between the connecting rod 213 and the frame 103; Specifically, when the first screw rod 200 at the bottom rotates counterclockwise, the slider 201 and the corresponding counterweight 104 can move to the right. When the slider 201 moves to the right to the position of one of the limit rings 214, the movement of the slider 201 is restricted. During this process, the slider 201 can touch the bottom of the connecting rod 213, so that one of the connecting rods 213 moves linearly to the right, and the first screw rod 200 adjacent to the top moves linearly, so that the third gear 204 is meshed with the first gear 202, and the fourth gear 205 is meshed with the second gear. The gear 203 disengages, and the connecting rod 213 moves to compress the second spring 215, allowing it to generate potential energy. At this time, the first screw rod 200 adjacent to the upper side rotates, allowing the second counterweight block 104 to move from bottom to top and cover the lowest counterweight block 104, thereby increasing the load of the lifting device. By analogy, the purpose of allowing multiple counterweight blocks 104 to move from bottom to top in sequence can be achieved. When the subsequent detection work is completed, the counterclockwise rotation of the first gear 202 can be stopped, and the second gear 203 can be rotated clockwise. The clockwise rotation of the second gear 203 can be The arrangement of the ratchet mechanism 212, the top rod 209, the first spring 210, and the top groove 211 allows the first screw rod 200 at the bottom to rotate clockwise. When the slider 201 leaves the connecting rod 213, the connecting rod 213 is reset by the force of the second spring 215. When the connecting rod 213 is reset, the first screw rod 200 can be reset straight to the left, and the fourth gear 205 is meshed with the second gear 203, the third gear 204 is disengaged from the first gear 202, and the remaining fourth gears 205 are meshed adjacently, so that all sliders 201 can perform reset movements to allow the gears 201 to perform reset movements. The weight block 104 returns to the frame 103 again, and the counterweight block 104 is reset to the initial position. At this time, the first screw rod 200, the connecting rod 213 and the related gears and ratchet mechanism 212 are restored to the initial state, and the entire system completes a complete counterweight loading and unloading process. In addition, during the entire loading and resetting process, the cooperation of the limit ring 214 and the second spring 215 ensures that each counterweight block 104 always remains stable during its movement, avoiding the problem of the counterweight block 104 deviating from the predetermined position due to excessive displacement or displacement error. The second spring 215 provides the necessary elastic force when the connecting rod 213 is reset, so that the connecting rod 213 can be reset in time to facilitate the next test.

[0037] As a further solution of the present invention, a connecting opening 216 is provided on the test box 100, a motor 217 is slidably connected in the connecting opening 216, a first transmission gear 218 is connected to the driving shaft of the motor 217, a connecting cavity 219 is provided in the connecting opening 216, a support rod 220 connected to the motor 217 is slidably connected in the connecting cavity 219, a third spring 221 is connected between the support rod 220 and the connecting cavity 219, a top contact rod 222 extending into the test box 100 is connected to the bottom of the support rod 220, a transmission shaft 223 is connected to the transmission shaft 223, a second transmission gear 224 meshing with the first transmission gear 218 is connected, a third transmission gear 225 is rotatably connected to the test box 100, and meshes with the second gear 203, and a chain transmission mechanism 226 is connected between the transmission shaft 223 and the third transmission gear 225; By setting the first transmission gear 218, in the initial state, the first transmission gear 218 is meshed with the second transmission gear 224, and the motor 217 can drive the first transmission gear 218 to rotate clockwise. When the first transmission gear 218 rotates clockwise, the second gear 203 can be rotated clockwise through the second transmission gear 224, the transmission shaft 223, the chain transmission mechanism 226, and the third transmission gear 225. The clockwise rotation of the second gear 203 can make the lowest first screw rod 200 rotate clockwise through the ratchet mechanism 212, the top rod 209, and the top groove 211, and the slider 201 and the counterweight block 104 are reset to the initial position. When the slider 201 moves to the extreme position, the second gear 203, the fourth gear 209, and the fifth gear 205 are rotated clockwise. The gear 205 idles on the first screw rod 200 due to the position of the top groove 211 of the top rod 209. During the test, the lifting end of the lifting device moves the top pressing platform 107 upward, and the top pressing platform 107 presses the top contact rod 222, so that the top contact rod 222, the support rod 220, the motor 217, and the first transmission gear 218 move upward, and the first transmission gear 218 is disengaged from the second transmission gear 224, and the first transmission gear 218 is engaged with the first gear 202. When the first transmission gear 218 rotates clockwise, the first gear 202 can rotate counterclockwise, and the slider 201 can move. Through the step-by-step loading and resetting design of the counterweight block 104, the working state of the lifting device under different load conditions can be simulated. Multiple counterweight blocks 104 can accurately control their movement and position, thereby improving the accuracy and reliability of the load test.

[0038] As a further solution of the present invention, an oblique opening 227 is provided on one side of the frame 103; By setting the oblique opening 227, when resetting the lifting end of the lifting device after the test is completed, since the current counterweight 104 is at the top of the pressing platform 107, when the pressing platform 107 is reset downward under its own gravity, the counterweight 104 will also be displaced downward by one end. The oblique opening 227 can ensure that after the counterweight 104 is displaced downward by one end, as the slider 201 moves, the counterweight 104 gradually enters the oblique opening 227. At this time, the oblique opening 227 can guide the counterweight 104 to move along the oblique sliding track of the frame 103, ensuring that the counterweight 104 smoothly returns to the receiving position of the frame 103. Through this design, the resetting process can be made more automated and safe, reducing manual intervention, and avoiding potential safety hazards caused by the offset position of the counterweight 104.

[0039] As a further solution of the present invention, a limit bar 228 is connected to one side of the slider 201, and a limit groove 229 slidably connected to the limit bar 228 is provided on one side of the counterweight 104; By setting the limit bar 228, setting the limit bar 228 and the limit groove 229, it is ensured that the counterweight block 104 can move up and down between each group of sliders 201 and limit the linear movement of the counterweight block 104 left and right between each group of blocks. The weight of the counterweight block 104 can still be stably transferred to the pressing platform 107, and the problem of poor contact between the counterweight block 104 and the pressing platform 107 will not be caused by the weight distribution problem.

[0040] As a further solution of the present invention, the locking component includes a connecting rod 300 rotatably connected to the positioning rod 106, a connecting shaft 301 rotatably connected to the connecting rod 300 is connected to the bottom of the pressing platform 107, and a fourth spring 302 is connected between the positioning rod 106 and the positioning frame 105; By setting the connecting shaft 301, when the lifting end of the pressing platform 107 is moved upward by the lifting device, the connecting shaft 301 is moved with it, and the bottom of the connecting shaft 301 can force the connecting rod 300 to rotate, so that the connecting rod 300 rotates around the positioning rod 106. During the rotation process, the positioning rod 106 can be pushed to move and stretch the fourth spring 302. When the lifting device stops moving upward and the pressing platform 107 no longer applies force, the positioning rod 106 reaches the position of the lifting device, and the lifting device can be locked to ensure that the lifting device remains stable. This locking process can effectively prevent the lifting device from generating unnecessary displacement during the load test, and ensure the accuracy and safety of the test.

[0041] As a further solution of the present invention, the closing component includes a second screw rod 400 rotatably connected to the test box 100, and the protective plate 102 is threadedly connected to the second screw rod 400; By setting the second screw rod 400, when used, the two second screw rods 400 can be rotated synchronously, so that the protective plate 102 moves along the threaded track of the second screw rod 400. When the two second screw rods 400 rotate synchronously, the protective plate 102 can be opened and closed smoothly in the test box 100, which effectively seals or protects the test area. This design can ensure that the movement of the protective plate 102 is accurate and stable, provide necessary safety protection during the test process, and prevent external interference or dangerous factors from affecting the test results.

[0042] As a further solution of the present invention, the closing component further comprises a rack 401 connected to the connecting shaft 301, and a fifth gear 402 meshing with the rack 401 is connected to the second screw rod 400; By setting the rack 401, when the connecting shaft 301 moves up or down with the pressing platform 107, the rack 401 will mesh with the fifth gear 402, thereby driving the rotation of the second screw rod 400. In this case, the protective plate 102 can also move synchronously therewith. When the pressing platform 107 is in an ascending or descending state, the movement of the rack 401 can ensure that the protective plate 102 automatically adjusts its position, avoiding the potential safety hazard caused by the failure of the protective plate 102 to close in time during the test. In this way, the protective plate 102 can not only provide effective regional protection, but also flexibly adjust its opening and closing state according to the different stages of the test, further enhancing the automation and safety performance of the system. In addition, by connecting the fifth gear 402 meshing with the rack 401 and the second screw rod 400, it can be ensured that the movement of the protective plate 102 is synchronized with the movement of the lifting device. This design ensures the coordinated operation of various components in the test box 100, reduces the need for manual adjustment, and thus improves the operating efficiency and safety of the test system. When the lifting device completes the load test and begins to reset, the meshing action of the rack 401 and the fifth gear 402 will prompt the protective plate 102 to reopen and release the counterweight 104, ensuring the smooth completion of the test process. During the entire test process, the coordinated operation of this closing and locking mechanism can provide a stable and reliable operating environment for the system, ensuring the accuracy and safety of the load test.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A test system for a lifting device, characterized in that: include: A test box (100), wherein one side of the test box (100) is provided with a side opening (101); Two protective plates (102) are arranged in the side opening (101), and the two protective plates (102) are capable of sliding to close the side opening (101); A frame (103) disposed on the top of the test box (100), wherein a plurality of counterweights (104) are disposed on the frame (103); A positioning frame (105) disposed in the test box (100) is used to preliminarily position the test piece, and the positioning frame (105) is provided with two positioning rods (106) capable of sliding on the positioning frame (105); A pressing platform (107) disposed in the test box (100), the bottom of which is in contact with the lifting end of the test piece; A moving component provided on the frame (103) and used for laterally moving the counterweight block (104); a locking component provided between the pressing platform (107) and the positioning rod (106), used for moving the position of the positioning rod (106) when the pressing platform (107) moves upward to a predetermined position; A closing component provided between the protection plate (102) and the pressing platform (107) is used to move the position of the protection plate (102) when the pressing platform (107) moves upward to a predetermined position.

2. A test system for a lifting device according to claim 1, characterized in that: A plurality of counterweight blocks (104) move in sequence from bottom to top, and when one of the counterweight blocks (104) moves to a predetermined position, the moving component stops the movement of the counterweight block (104) and triggers the adjacent counterweight block (104) above to start moving, wherein the moving component can move the position of the counterweight block (104) when the pressing platform (107) moves upward to a predetermined position, and the moving component can reset the position of the counterweight block (104) when the pressing platform (107) leaves the predetermined position.

3. A test system for a lifting device according to claim 1, characterized in that: The moving component comprises a plurality of first screw rods (200) arranged on the frame (103), wherein a slider (201) is threadedly connected to the first screw rods (200), and the slider (201) corresponds to the position of the counterweight (104), and the two ends of the lowest first screw rod (200) are respectively connected to a first gear (202) and a second gear (203), and the two ends of the remaining first screw rods (200) are respectively connected to a third gear (204) adapted to the first gear (202) and a fourth gear (205 meshed with the second gear (203), and the inner walls of the first gear (202), the second gear (203), the third gear (204) and the fourth gear (205) are provided with a rotation groove (206), and the first screw rod (200) is connected to a connecting ring (207), and the connecting ring (207) ) is rotatably sleeved in the rotating groove (206), the outer wall of the connecting ring (207) is provided with a plurality of connecting grooves (208), a push rod (209) is slidably connected in the connecting groove (208), a first spring (210) is connected between the push rod (209) and the connecting groove (208), the inner wall of the rotating groove (206) is provided with a plurality of top grooves (211) corresponding to the push rod (209), the top groove (211) is a semi-spherical groove, and one end of the push rod (209) and the top groove (211) sleeved is semi-spherical, wherein a ratchet mechanism (212) is provided between the connecting ring (207) in the second gear (203) and the first screw rod (200), and a ratchet mechanism (212) is also provided between the connecting ring (207) in the fourth gear (205) and the first screw rod (200).

4. A test system for a lifting device according to claim 3, characterized in that: A plurality of connecting rods (213) are slidably connected to the frame body (103); the top of the connecting rod (213) is rotatably connected to a first screw rod (200) adjacent to the top; the bottom of the connecting rod (213) is sleeved with a first screw rod (200) adjacent to the bottom, corresponding to the position of the slider (201); two limiting rings (214) are connected to the first screw rod (200) for limiting the moving position of the slider (201); and a second spring (215) is connected between the connecting rod (213) and the frame body (103).

5. A test system for a lifting device according to claim 1, characterized in that: The test box (100) is provided with a connection opening (216), a motor (217) is slidably connected in the connection opening (216), a first transmission gear (218) is connected to the drive shaft of the motor (217), a connection cavity (219) is provided in the connection opening (216), a support rod (220) connected to the motor (217) is slidably connected in the connection cavity (219), a third spring (221) is connected between the support rod (220) and the connection cavity (219), and the support rod (220) is provided with a connection cavity (219). The bottom of the test box (220) is connected to a top contact rod (222) extending into the test box (100); the test box (100) is connected to a transmission shaft (223); the transmission shaft (223) is connected to a second transmission gear (224) meshing with the first transmission gear (218); the test box (100) is rotatably connected to a third transmission gear (225) meshing with the second gear (203); and a chain transmission mechanism (226) is connected between the transmission shaft (223) and the third transmission gear (225).

6. A test system for a lifting device according to claim 1, characterized in that: An oblique opening (227) is provided on one side of the frame (103).

7. A test system for a lifting device according to claim 3, characterized in that: One side of the sliding block (201) is connected to a limit strip (228), and one side of the counterweight block (104) is provided with a limit slot (229) slidably connected to the limit strip (228).

8. A test system for a lifting device according to claim 1, characterized in that: The locking component comprises a connecting rod (300) rotatably connected to the positioning rod (106); a connecting shaft (301) rotatably connected to the connecting rod (300) is connected to the bottom of the pressing platform (107); and a fourth spring (302) is connected between the positioning rod (106) and the positioning frame (105).

9. A test system for a lifting device according to claim 8, characterized in that: The closing component comprises a second screw rod (400) rotatably connected to the test box body (100), and the protection plate (102) is threadedly connected to the second screw rod (400).

10. A test system for a lifting device according to claim 9, characterized in that: The closing component further comprises a rack (401) connected to the connecting shaft (301), and the second screw rod (400) is connected to a fifth gear (402) meshing with the rack (401).

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