A lift table rollback resistance test system and test method

Abstract

The present application relates to the technical field of resistance detection, in particular to a lifting table back-off resistance testing system and testing method. The system comprises a stand column, one side of the stand column is provided with a cantilever, the end of the cantilever is provided with a pressure sensor; the end of the cantilever is also provided with a positioning assembly, the positioning assembly is located at the central space position of the cantilever; the end of the cantilever located at the center of the pressure sensor is also provided with a cylinder, the movable end of the cylinder penetrates into the inside of the positioning assembly and is fixedly connected with a pushing assembly, one end of the pushing assembly away from the cylinder is provided with a tab; when the lifting table descends and presses against the positioning assembly, the positioning assembly is adsorbed and fixed on the surface of the lifting table; when the lifting table continues to descend and extrudes the pressure sensor, the pressure sensor collects resistance pressure data; when the test is completed and the lifting table ascends back, the movable end of the cylinder extends out, drives the pushing assembly to drive the tab to move from the center of the positioning assembly to the edge thereof, so as to destroy the adsorption state between the positioning assembly and the surface of the lifting table.

Description

Technical Field

[0001] This invention relates to the field of obstruction detection technology, and more specifically, to a test system and method for testing the obstruction detection during the retraction of a height-adjustable table. Background Technology

[0002] As a widely used type of adjustable furniture in offices and homes, the safety of height-adjustable desks during their raising and lowering process is receiving increasing attention. If the desk surface encounters an obstacle (such as furniture, pets, or human parts) during the raising or lowering process, it may not only damage the motor or transmission mechanism but also cause crushing injuries to the obstacle or even pose a safety hazard to the user. Therefore, most existing height-adjustable desks are equipped with an obstacle detection and reversal function. This means that when an obstacle is detected during movement, the device immediately moves in the opposite direction to avoid damaging the furniture or injuring the user. To ensure the effectiveness and reliability of this function, the obstacle detection and reversal performance of the height-adjustable desk must undergo specific testing before leaving the factory.

[0003] Currently, testing the obstacle detection and retraction function of height-adjustable desks typically involves simulating obstacles. The test device is placed on the desk's lifting path, and the desk is raised or lowered until it contacts the device. Built-in sensors measure the contact force triggered during retraction to determine if the desk's obstacle detection and retraction function meets relevant standards. Common testing methods in existing devices include using a travel detector to sense the movement distance of the detection rod, using strain gauges or pressure sensors to detect force changes, and using current detection or gyroscope-based methods. During testing, the device contacts the desk's tabletop or legs, and sensors collect pressure data at the moment of obstacle detection.

[0004] However, in actual use, the existing testing equipment lacks an effective positioning structure during the testing process. The relative position between the device and the lifting table cannot be reliably fixed. When the lifting table applies pressure, the device is prone to horizontal displacement, which causes the pressure transmission path to deviate. The force value measured by the sensor cannot truly reflect the resistance encountered in the vertical direction, affecting the testing accuracy and reliability.

[0005] Therefore, there is an urgent need for a test system and method for testing the obstruction encountered during the retraction of a height-adjustable desk to solve the above problems. Summary of the Invention

[0006] This invention provides a system and method for testing the resistance encountered during the retraction of a lifting table. By adding a positioning component with a suction cup structure, a cylinder, a pushing component, and a pry bar to the end of the cantilever, the suction cup is preferentially compressed and deformed during the downward pressing process, adhering and fixing itself to the surface of the lifting table. This restricts horizontal displacement of the testing device. After the suction cup is compressed, the lifting table can contact the pressure sensor to collect pressure. After the test is completed, the cylinder drives the pry bar to move and pry open the contact surface of the suction cup, breaking the vacuum adsorption and completing the separation. This solves the problems mentioned in the background art, namely: Existing testing equipment lacks a reliable positioning structure, which can easily cause horizontal displacement and skewed pressure transmission when under pressure, resulting in inaccurate values ​​measured by the pressure sensor and poor testing accuracy.

[0007] To achieve the above objectives, the lifting table retraction and resistance testing system and method includes a column, a cantilever on one side of the column, and a pressure sensor at the end of the cantilever. The pressure sensor is used to collect resistance pressure data when the lifting table comes into contact with the testing system. The cantilever end is also provided with a positioning component, which is located at the center of the cantilever. The top working end of the positioning component is higher than the force-bearing surface of the pressure sensor in the initial state, so as to be preferentially pressed and generate a positioning effect when the lifting table descends. The cantilever end is also provided with a cylinder at the center of the pressure sensor. The movable end of the cylinder is telescopically disposed inside the positioning component. The movable end of the cylinder passes through the positioning component and is fixedly connected to a pushing component. The end of the pushing component away from the cylinder is provided with a pry bar. When the lifting table descends and presses against the positioning component, the positioning component is attracted and fixed to the surface of the lifting table to constrain the relative position between the test system and the lifting table; when the lifting table continues to descend and squeezes the pressure sensor, the pressure sensor collects the resistance pressure data. When the test is completed and the lifting table rises and retracts, the movable end of the cylinder extends, driving the push component to move the pry bar from the center of the positioning component to its edge, thereby breaking the adsorption state between the positioning component and the surface of the lifting table and realizing the separation of the test system from the lifting table.

[0008] In the above technical solution, because the top of the initial positioning component is higher than the pressure sensor's force-bearing surface, the lifting table will first contact the compression positioning component when it moves downwards. The suction cup, after being compressed, undergoes elastic deformation and adheres tightly to the tabletop, creating a vacuum suction that locks the entire test end and the lifting table body. This can resist the lateral thrust from the downward impact and prevent the cantilever end from shifting horizontally. Only after the suction cup is compressed to be flush with the pressure sensor end face will the lifting table body contact the pressure sensor, ensuring that the pressure is transmitted vertically to the sensor and avoiding data deviation caused by force misalignment. When the lifting table retracts upwards after the test, the built-in cylinder extends and drives the pry bar to move towards the edge of the suction cup via the pushing component. The pry bar weds into the gap between the suction cup and the tabletop, breaking the vacuum negative pressure and releasing the suction restraint. There is no need to manually peel off the suction cup. Therefore, the entire device can firmly lock the relative position during the test, ensuring accurate vertical pressure detection. At the same time, it can automatically unlock the suction cup, simplifying the testing process and avoiding the operational trouble caused by manually disassembling and assembling the positioning fixture.

[0009] Based on this, the positioning component includes a suction cup, a base plate, and multiple support rods. The bottom end of the suction cup is fixedly connected to the base plate, and the base plate is fixedly supported to the end of the cantilever by multiple support rods.

[0010] Preferably, the suction cup is made of a flexible elastic material, and the base plate is made of a rigid material. The suction cup is used to generate elastic deformation when pressed to adhere to the surface of the lifting table, and the base plate is used to provide rigid support for the suction cup and limit its bottom deformation.

[0011] The suction cup is truncated conical in shape, with its large-diameter end facing upwards for adhering to the surface of the lifting table, and its small-diameter end fixedly connected to the base plate, which provides rigid support for the small-diameter end of the suction cup.

[0012] In another technical solution, the pushing assembly includes a push rod, a support plate, and a support. Both ends of the push rod are provided with rotating shafts. One end of the push rod is rotatably connected to the support plate through the rotating shaft, and the support plate is fixedly connected to the bottom of the rocker arm. The other end of the push rod is rotatably connected to the support through the rotating shaft, and the support is fixedly connected to the movable end of the cylinder.

[0013] Furthermore, the top end face of the suction cup is initially higher than the force-bearing surface of the pressure sensor. When the suction cup is pressed down by the lifting table and undergoes elastic compression deformation, the top end face of the suction cup and the force-bearing surface of the pressure sensor are on the same horizontal plane.

[0014] Preferably, the pry bar is located in the internal cavity of the suction cup, and the initial end face height of the pry bar is parallel to the end face height of the pressure sensor. When the cylinder drives the push assembly, the pry bar moves towards the edge of the suction cup under the action of the push rod and weds into the interface between the suction cup and the surface of the lifting table to break the vacuum adsorption state.

[0015] Preferably, the pry bar is disc-shaped, with a diameter smaller than the inner diameter of the large-diameter port of the suction cup, and the pry bar is made of wear-resistant polymer material to reduce frictional resistance with the inner wall of the suction cup during movement.

[0016] In addition, the pushing assembly is located inside the cavity of the suction cup, the cylinder is located below the base plate, and the piston rod of the cylinder passes through the base plate and extends into the interior of the suction cup to be fixedly connected to the pushing assembly.

[0017] The second objective of this invention is to provide a test method for operating a height-adjustable table retraction resistance test system as described in any one of the above-mentioned claims, comprising the following method steps: Step 1: System calibration: Align the positioning component at the end of the cantilever with the test force surface of the lifting table, adjust the height of the cantilever so that the top working end of the positioning component maintains a predetermined distance from the test force surface of the lifting table, and perform zero calibration on the pressure sensor. Step 2: Initial state confirmation: Confirm that the top working end of the positioning component is higher than the force-bearing surface of the pressure sensor, the top surface of the rocker is parallel to the force-bearing surface of the pressure sensor, and the pushing component and the rocker are located at the center of the positioning component. Step 3: Descending Adsorption and Pressure Test: Control the lifting table to descend at a preset speed, so that the test force surface of the lifting table first contacts and presses down on the top of the positioning component. The positioning component generates elastic deformation and adsorbs and fixes itself to the surface of the lifting table to constrain the relative position between the test system and the lifting table. The lifting table continues to descend and squeezes the pressure sensor, and the pressure sensor collects the resistance pressure data in real time. Step 4: Obstacle detection and data recording: When the pressure value collected by the pressure sensor reaches the preset threshold, the lifting table is determined to trigger the obstacle detection and retraction function, and the current pressure peak value and the displacement of the lifting table are recorded; if the lifting table does not trigger retraction within the preset conditions, it is recorded as unqualified and the test is stopped. Step 5: Retraction and Disengagement: When the test is completed and the lifting table rises and retracts, the cylinder is activated. The movable end of the cylinder extends and drives the pushing component to move the pry bar from the center of the positioning component to its edge. The pry bar weds into the interface between the positioning component and the surface of the lifting table to break the adsorption state. At the same time, the lifting table continues to rise, so that the test system is completely separated from the lifting table. Step Six: System Reset: The moving end of the cylinder retracts, driving the pushing component and the rocker arm to reset to the center position of the positioning component. The positioning component returns to its initial shape due to its own elasticity, waiting for the next test.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting a positioning component at the end of the cantilever, and ensuring that the top working end of the positioning component is initially higher than the force-bearing surface of the pressure sensor, when the lifting table descends, the positioning component contacts the lifting table before the pressure sensor and generates an adsorption and fixing effect. This locks the relative position between the test system and the lifting table before the pressure sensor officially collects data, effectively constraining the horizontal deviation that the test system may experience when subjected to the downward impact of the lifting table, ensuring the verticality and stability of the subsequent pressure transmission path, and improving the accuracy of the pressure data acquisition when encountering obstacles.

[0019] 2. By setting the positioning component as a suction cup structure made of flexible elastic material, when the lifting table is pressed down, the suction cup undergoes elastic deformation and tightly adheres to the surface of the lifting table to form a vacuum adsorption. The adsorption force is used to lock the end of the cantilever to the test surface of the lifting table as one unit, so that the lateral component force generated by the lifting table during the pressing process is effectively canceled by the adsorption force, avoiding the force distortion caused by device shaking or slippage, and ensuring that the force value measured by the pressure sensor truly reflects the vertical force situation when the lifting table encounters resistance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the pressure sensor of the present invention; Figure 3 This is a schematic diagram of the suction cup compression configuration of the present invention; Figure 4 This is a schematic diagram of the motion state of the pushing component of the present invention; Figure 5 This is a schematic diagram of the internal structure of the suction cup of the present invention; Figure 6 This is a schematic diagram of the internal structure of the base plate of the present invention; Figure 7 This is a schematic diagram of the warp plate structure of the present invention; Figure 8 This is a schematic diagram of the pushing component structure of the present invention.

[0021] The meanings of the labels in the diagram are as follows: 1. Column; 10. Cantilever; 11. Pressure sensor; 12. Positioning component; 120. Suction cup; 121. Base plate; 122. Support rod; 13. Tilted tablets; 14. Push assembly; 140. Push rod; 141. Rotating shaft; 142. Support plate; 143. Support; 15. Cylinder. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Currently, existing testing devices lack a reliable positioning structure, are prone to displacement under pressure, and suffer from skewed pressure transmission, resulting in poor detection accuracy. This invention provides a lifting table retraction and obstruction testing system. (See [link to relevant documentation]). Figure 1 As shown, it includes a column 1, a cantilever 10 on one side of the column 1, and a pressure sensor 11 at the end of the cantilever 10. The pressure sensor 11 is used to collect resistance pressure data when the lifting table comes into contact with the testing system. Figure 2 In the middle, the end of the cantilever 10 is also provided with a positioning component 12, which is located at the center of the cantilever 10.

[0024] For details, see Figure 5 As shown, the positioning component 12 includes a suction cup 120, a base plate 121, and multiple support rods 122. The bottom end of the suction cup 120 is fixedly connected to the base plate 121, and the base plate 121 is fixedly supported at the end of the cantilever 10 by the multiple support rods 122. Figure 6 In the middle, the pushing component 14 is located in the internal cavity of the suction cup 120, and the cylinder 15 is located below the base plate 121. The piston rod of the cylinder 15 passes through the base plate 121 and extends into the interior of the suction cup 120 to be fixedly connected to the pushing component 14.

[0025] For specific installation instructions, please refer to [link / reference]. Figure 3 and Figure 4 As shown, the support rods 122 are evenly distributed below the periphery of the base plate 121. The upper end of each support rod 122 is fixedly connected to the bottom surface of the base plate 121, and the lower end is fixedly connected to the end of the cantilever 10, so that the entire positioning assembly 12 is stably supported at the end of the cantilever 10. The base plate 121 serves to close the bottom port of the suction cup 120 and provides a rigid mounting base for the suction cup 120. It also serves as a channel support for the piston rod of the cylinder 15 to penetrate into the inside of the suction cup 120. The cylinder 15 is installed below the base plate 121, and its piston rod passes upward through the through hole in the center of the base plate 121 into the internal cavity of the suction cup 120, and is fixedly connected to the pushing assembly 14 located inside the suction cup 120, so that the driving action of the cylinder 15 can be directly transmitted to the pushing assembly 14 inside the suction cup 120.

[0026] In addition, the suction cup 120 is truncated conical in shape, with its large-diameter end facing upward for adhering to the surface of the lifting table, and its small-diameter end fixedly connected to the base plate 121. The suction cup 120 is made of a flexible elastic material, while the base plate 121 is made of a rigid material. The suction cup 120 is used to generate elastic deformation when pressed to adhere to the surface of the lifting table, and the base plate 121 is used to provide rigid support for the suction cup 120 and limit its bottom deformation.

[0027] Specifically, the suction cup 120 is shaped like a truncated cone, with a larger upper end and a smaller lower end, i.e., a frustum-shaped structure. Its upper end is a large-diameter port with the opening facing upward to form a larger adsorption area for contact with the test force surface of the lifting table. Its lower end is a small-diameter port, which is fixedly connected to the base plate 121. This shape design, with a larger upper end and a smaller lower end, allows the sidewalls of the suction cup 120 to elastically expand and deform outward when pressed down by the lifting table, increasing the contact area between the suction cup 120 and the surface of the lifting table, which is conducive to forming a more reliable vacuum adsorption.

[0028] It should be noted that the flexible elastic material used in suction cup 120 can be silicone or rubber, which has good flexibility, elasticity and airtightness. It can produce recoverable elastic deformation when subjected to vertical pressure, squeezing out the internal air and forming a negative pressure area between it and the surface of the lifting table, thereby achieving a vacuum adsorption effect. At the same time, after the external pressure is removed, the material can rely on its own elasticity to return to its original shape, which is convenient for repeated use.

[0029] The rigid material used for the base plate 121 can be metal or hard plastic, etc., which has sufficiently high structural strength and rigidity. When the suction cup 120 is deformed by pressure, the base plate 121 can form a rigid support for the suction cup 120 from the bottom, restricting the radial expansion or deformation of the bottom of the suction cup 120 at the small diameter port, ensuring that the deformation of the suction cup 120 is mainly concentrated in the side wall and the large diameter port area, thereby ensuring that the pressure is transmitted vertically upward to the pressure sensor 11, and avoiding the force line deviation caused by the deformation of the bottom.

[0030] Figure 3 In the middle, the end of the cantilever 10 is located at the center of the pressure sensor 11 and is equipped with a cylinder 15. The movable end of the cylinder 15 is telescopically disposed inside the positioning component 12. The movable end of the cylinder 15 passes through the positioning component 12 and is fixedly connected to the pushing component 14. The end of the pushing component 14 away from the cylinder 15 is provided with a pry bar 13.

[0031] See Figure 8As shown, the pushing assembly 14 includes a push rod 140, a support plate 142, and a support 143. Both ends of the push rod 140 are provided with rotating shafts 141. One end of the push rod 140 is rotatably connected to the support plate 142 through the rotating shaft 141. The support plate 142 is fixedly connected to the bottom of the rocker arm 13. The other end of the push rod 140 is rotatably connected to the support 143 through the rotating shaft 141. The support 143 is fixedly connected to the movable end of the cylinder 15.

[0032] Specifically, see Figure 7 and Figure 8 As shown, the push rod 140, as an intermediate component for power transmission, has an overall straight rod structure. A rotating shaft 141 is provided at the upper end of the push rod 140, which rotatably connects the upper end of the push rod 140 to the support plate 142, allowing the push rod 140 to rotate relative to the support plate 142 around the rotating shaft 141. The support plate 142 is fixedly located at the bottom center of the rocker arm 13, used to connect the upper end of the push rod 140 to the rocker arm 13 as a single unit. Another rotating shaft 141 is provided at the lower end of the push rod 140, which rotatably connects the lower end of the push rod 140 to the support 143, allowing the push rod 140 to rotate relative to the support 143 around the rotating shaft 141. The support 143 is fixedly connected to the end of the piston rod of the cylinder 15, serving as a direct receiver of the driving force of the cylinder 15.

[0033] Through the connection of the two rotating shafts 141 described above, the push rod 140 can rotate around the two rotating shafts 141 when the piston rod of the cylinder 15 extends or retracts, thereby converting the vertical extension and retraction motion of the cylinder 15 into the tilting and swinging motion of the push rod 140, and then converting the tilting and swinging motion of the push rod 140 into the horizontal movement of the rocker arm 13. This dual rotating shaft 141 connection structure gives the entire push assembly 14 two rotational degrees of freedom, which can flexibly convert the vertical driving force into the horizontal driving force, and realize the effective control of the rocker arm 13's movement direction by a single driving source.

[0034] In the above technical solutions, it should be noted that, see [link to relevant documentation] Figure 3As shown, the top surface of the suction cup 120 is initially higher than the force-bearing surface of the pressure sensor 11. When the suction cup 120 is pressed down by the lifting table and undergoes elastic compression deformation, the top surface of the suction cup 120 and the force-bearing surface of the pressure sensor 11 are at the same horizontal plane. Specifically, in the initial state, that is, when the suction cup 120 is not subjected to any external pressure, the upper surface of the large-diameter port of the suction cup 120 is higher than the upper surface of the pressure sensor 11. Through this height difference setting, the test force-bearing surface of the lifting table will first contact the upper surface of the suction cup 120, rather than the force-bearing surface of the pressure sensor 11, during the descent of the lifting table. As the lifting table continues to descend, the suction cup 120 is gradually compressed, and its top surface also decreases accordingly. During this process, the air inside the suction cup 120 is expelled and a vacuum adsorption is formed, locking the test system to the lifting table.

[0035] When the suction cup 120 is compressed until its top end face is flush with the force-bearing surface of the pressure sensor 11, the test force-bearing surface of the lifting table begins to contact the force-bearing surface of the pressure sensor 11. At this time, the pressure sensor 11 begins to bear force and collect data. This timing design ensures that the positioning and adsorption action is completed before the pressure acquisition action, ensuring that a reliable positioning and locking relationship has been established between the test system and the lifting table before the pressure sensor 11 collects data.

[0036] Since the pry bar 13 is located in the internal cavity of the suction cup 120, the initial end face height of the pry bar 13 is parallel to the end face height of the pressure sensor 11. When the cylinder 15 drives the push assembly 14 to move, the pry bar 13 moves towards the edge of the suction cup 120 under the action of the push rod 140 and weds into the interface between the suction cup 120 and the surface of the lifting table to break the vacuum adsorption state. At this time, the initial end face height of the pry bar 13 is parallel to the force-bearing surface height of the pressure sensor 11, which means that the pry bar 13 is in a horizontal position in the initial state and maintains a parallel relationship with the force-bearing surface of the lifting table. In this way, when the lifting table is pressed down, the pry bar 13 will not contact the lifting table before the suction cup 120 or the pressure sensor 11, so as not to interfere with the normal adsorption and force measurement process.

[0037] Figure 4 When the cylinder 15 drives the push assembly 14 to move, the pry bar 13 moves horizontally from the center of the suction cup 120 to the edge of the suction cup 120 under the action of the push rod 140. When the pry bar 13 moves to the edge of the suction cup 120, its edge wedges into the interface between the upper surface of the suction cup 120 and the surface of the lifting table, forming a gap at the interface, allowing external air to enter the internal cavity of the suction cup 120, thereby breaking the negative pressure vacuum state inside the suction cup 120.

[0038] In addition, it should be noted that the pry bar 13 is disc-shaped, and its diameter is smaller than the inner diameter of the large-diameter port of the suction cup 120. The pry bar 13 is made of wear-resistant polymer material, which is used to reduce the frictional resistance with the inner wall of the suction cup 120 when moving. Specifically, the pry bar 13 is a circular thin sheet structure, and its outer diameter is smaller than the inner diameter of the large-diameter port of the suction cup 120. This allows the pry bar 13 to move freely in the internal cavity of the suction cup 120 without interfering with the side wall of the suction cup 120.

[0039] Furthermore, the pry bar 13 is made of wear-resistant polymer materials such as polytetrafluoroethylene or ultra-high molecular weight polyethylene. These materials have the characteristics of low coefficient of friction, good self-lubrication and high wear resistance. When the pry bar 13 moves inside the suction cup 120, the friction between its edge and the inner wall of the suction cup 120 is minimal, which will not cause scratch damage to the inner wall of the suction cup 120, and at the same time ensures the smoothness of the movement and response speed of the pry bar 13.

[0040] The second objective of this invention is to provide a test method for a test system for a height-adjustable table that includes any of the above-mentioned features, comprising the following steps: Step 1: System Calibration Align the positioning component 12 at the end of the cantilever 10 with the test force surface of the lifting table, adjust the height of the cantilever 10 to maintain a predetermined distance between the top working end of the positioning component 12 and the test force surface of the lifting table, and perform zero calibration on the pressure sensor 11 to ensure that the starting conditions of each test are consistent. During the calibration process, by adjusting the vertical height of the cantilever 10, an appropriate gap is maintained between the upper end face of the large diameter port of the suction cup 120 and the test force surface of the lifting table. The pressure sensor 11 is adjusted to zero under no external force to eliminate the interference of sensor drift or environmental factors on the measurement results.

[0041] Step 2: Initial State Confirmation Confirm that the top working end of the positioning component 12 is higher than the force-bearing surface of the pressure sensor 11, the top surface of the pry bar 13 is parallel to the force-bearing surface of the pressure sensor 11, and the pushing component 14 and the pry bar 13 are located at the center of the positioning component 12, ensuring that each component is in the correct positional relationship; in the initial state, the top of the suction cup 120 is higher than the force-bearing surface of the pressure sensor 11, the top surface of the pry bar 13 is parallel to the force-bearing surface of the pressure sensor 11, and the pushing component 14 and the pry bar 13 are located at the center inside the suction cup 120, reserving sufficient travel space for the subsequent movement of the pry bar 13 to the edge.

[0042] Step 3: Descent, Contact, and Adsorption Positioning The lifting table is controlled to descend at a preset speed, so that the test force-bearing surface of the lifting table first contacts and presses down on the top of the positioning component 12. Since the top end face of the suction cup 120 is higher than the force-bearing surface of the pressure sensor 11, the lifting table first contacts the top end face of the suction cup 120 rather than the pressure sensor 11 when it descends. Since the suction cup 120 is made of flexible elastic material, its side wall expands and deforms outward after being subjected to vertical pressure, the internal cavity volume decreases, and air is squeezed out from the contact interface, forming a negative pressure area between the suction cup 120 and the surface of the lifting table, generating a vacuum adsorption effect. After the suction cup 120 is adsorbed and fixed on the surface of the lifting table, the test system and the lifting table are locked together, effectively constraining the relative position between the two. Even if there is horizontal shaking or lateral impact during the downward pressing of the lifting table, the adsorption force can effectively offset the lateral component force, prevent the end of the cantilever 10 from horizontally shifting, and ensure the verticality of the subsequent pressure transmission path.

[0043] Step 4: Pressure Acquisition and Data Measurement As the lifting table continues to descend, the suction cup 120 is further compressed, and its top surface gradually decreases. When the suction cup 120 is compressed to the same horizontal plane as the force-bearing surface of the pressure sensor 11, the test force-bearing surface of the lifting table just begins to contact and squeeze the force-bearing surface of the pressure sensor 11. At this time, the vertical pressure applied by the lifting table is directly transmitted to the pressure sensor 11 along the shortest path, and the pressure sensor 11 begins to collect the resistance pressure data in real time.

[0044] Step 5: Obstacle detection and recording When the pressure value collected by pressure sensor 11 reaches the preset threshold, it is determined that the lifting table has triggered the obstruction and retraction function, and the current pressure peak value and the displacement of the lifting table are recorded; if the lifting table continues to press down and the pressure value has reached or exceeded the preset threshold but the retraction is not triggered, it is determined to be unqualified and the test is stopped, and the relevant data is recorded for analysis.

[0045] The preset threshold is a range of trigger force values ​​set according to relevant safety standards or product specifications. When the data collected in real time by the pressure sensor 11 reaches this threshold, it indicates that the obstacle detection and retraction function of the lifting table is responding normally within the predetermined sensitivity range. The displacement of the lifting table can be obtained through external displacement sensors or encoder data from the lifting table itself. This data can be used to analyze whether the response time and protection distance of the retraction function meet the standard requirements.

[0046] Step Six: Reverse Start and Thrust Transfer When the test is completed and the lifting table rises and retracts, cylinder 15 is activated. The movable end of cylinder 15 extends, and when the piston rod of cylinder 15 extends, it pushes the support 143 upward. The support 143 drives the lower end of push rod 140 to move upward. Since the two ends of push rod 140 are rotatably connected to support 143 and support plate 142 through rotating shaft 141 respectively, the entire push rod 140 rotates around the two rotating shafts 141 under the action of thrust, gradually switching from a vertical state to an inclined state. The inclined movement of push rod 140 is transmitted to rocker plate 13 through support plate 142, causing rocker plate 13 to move from the center position to the edge of suction cup 120 inside suction cup 120.

[0047] Step 7: Insertion of the 13-ply wedge and vacuum breaking Driven by the push rod 140, the pry bar 13 continues to move towards the edge of the suction cup 120. When the pry bar 13 moves to the edge of the suction cup 120, its edge wedges into the interface between the upper surface of the suction cup 120 and the surface of the lifting table. Since the pry bar 13 is disc-shaped and its diameter is smaller than the inner diameter of the large diameter port of the suction cup 120, its edge is thin and smooth and made of wear-resistant polymer material. It can be smoothly inserted into the tiny gap between the suction cup 120 and the table without damaging the inner wall of the suction cup 120. After the pry bar 13 wedges into the interface, a gap is formed at the interface, and external air can enter the internal cavity of the suction cup 120. The negative pressure vacuum state inside the suction cup 120 is destroyed, and the adsorption force disappears.

[0048] Step 8: Test System Decoupling After the adsorption force disappears, the locking relationship between the suction cup 120 and the surface of the lifting table is released, the lifting table continues to rise, and the test system separates naturally from the lifting table. The whole process does not require manual intervention or external tools. The suction cup 120 will not be damaged by pulling, and the surface of the lifting table will not be scratched. After separation, the test system is completely detached from the lifting table and is in a free state.

[0049] Step Nine: System Reset and Preparation The movable end of the cylinder 15 retracts, causing the pushing component 14 and the rocker arm 13 to return to the center position of the positioning component 12, and the push rod 140 returns from the tilted state to the vertical state; after losing external constraints, the suction cup 120 rebounds to its initial shape by relying on the elastic recovery ability of the flexible material, and its top end face is once again higher than the force-bearing surface of the pressure sensor 11; at this point, the entire test system has completed a complete test cycle and automatically returns to the standby state, and can immediately enter the next test without manual repositioning or intervention.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lifting table retraction resistance testing system, comprising a column (1), a cantilever (10) provided on one side of the column (1), and a pressure sensor (11) provided at the end of the cantilever (10), the pressure sensor (11) being used to collect resistance pressure data when the lifting table contacts the testing system, characterized in that: The end of the cantilever (10) is also provided with a positioning component (12). The positioning component (12) is located at the center of the cantilever (10), and the top working end of the positioning component (12) is higher than the force-bearing surface of the pressure sensor (11) in the initial state, so as to be preferentially pressed and generate a positioning effect when the lifting table descends. The end of the cantilever (10) is located at the center of the pressure sensor (11) and is also provided with a cylinder (15). The movable end of the cylinder (15) is telescopically disposed inside the positioning component (12). The movable end of the cylinder (15) passes into the positioning component (12) and is fixedly connected to a pushing component (14). The end of the pushing component (14) away from the cylinder (15) is provided with a pry bar (13). When the lifting table descends and presses against the positioning component (12), the positioning component (12) is attached to the surface of the lifting table to constrain the relative position between the test system and the lifting table; when the lifting table continues to descend and squeezes the pressure sensor (11), the pressure sensor (11) collects the resistance pressure data. When the test is completed and the lifting table rises and retracts, the movable end of the cylinder (15) extends, driving the pushing component (14) to move the pry bar (13) from the center of the positioning component (12) to its edge, thereby breaking the adsorption state between the positioning component (12) and the surface of the lifting table, and realizing the separation of the test system from the lifting table.

2. The height-adjustable table retraction resistance testing system according to claim 1, characterized in that: The positioning component (12) includes a suction cup (120), a base plate (121) and multiple support rods (122). The bottom end of the suction cup (120) is fixedly connected to the base plate (121), and the base plate (121) is fixedly supported at the end of the cantilever (10) by multiple support rods (122).

3. The resistance detection test system for the height-adjustable table retraction according to claim 2, characterized in that: The suction cup (120) is made of a flexible elastic material, and the base plate (121) is made of a rigid material. The suction cup (120) is used to generate elastic deformation when pressed to adhere to the surface of the lifting table. The base plate (121) is used to provide rigid support for the suction cup (120) and limit its bottom deformation.

4. The resistance detection test system for the height-adjustable table retraction according to claim 2, characterized in that: The suction cup (120) is truncated conical in shape, with its large diameter port facing upward for adhering to the surface of the lifting table, and its small diameter port fixedly connected to the base plate (121), which provides rigid support for the small diameter port of the suction cup (120).

5. The resistance detection test system for the height-adjustable table retraction according to claim 1, characterized in that: The pushing assembly (14) includes a push rod (140), a support plate (142), and a support (143). Both ends of the push rod (140) are provided with a rotating shaft (141). One end of the push rod (140) is rotatably connected to the support plate (142) through the rotating shaft (141). The support plate (142) is fixedly connected to the bottom of the rocker arm (13). The other end of the push rod (140) is rotatably connected to the support (143) through the rotating shaft (141). The support (143) is fixedly connected to the movable end of the cylinder (15).

6. The resistance detection test system for the retraction of a height-adjustable table according to claim 2, characterized in that: The top end face of the suction cup (120) is higher than the force-bearing surface of the pressure sensor (11) in the initial state. When the suction cup (120) is pressed down by the lifting table and undergoes elastic compression deformation, the top end face of the suction cup (120) and the force-bearing surface of the pressure sensor (11) are on the same horizontal plane.

7. The resistance detection test system for the retraction of a height-adjustable table according to claim 2, characterized in that: The pry bar (13) is located in the internal cavity of the suction cup (120). The initial end face height of the pry bar (13) is parallel to the end face height of the pressure sensor (11). When the cylinder (15) drives the push assembly (14) to move, the pry bar (13) moves towards the edge of the suction cup (120) under the drive of the push rod (140) and weds into the interface between the suction cup (120) and the surface of the lifting table to break the vacuum adsorption state.

8. The height-adjustable table retraction resistance testing system according to claim 7, characterized in that: The pry bar (13) is disc-shaped, and its diameter is smaller than the inner diameter of the large diameter port of the suction cup (120). The pry bar (13) is made of wear-resistant polymer material and is used to reduce the frictional resistance with the inner wall of the suction cup when moving.

9. The resistance detection test system for the retraction of a height-adjustable table according to claim 8, characterized in that: The pushing assembly (14) is located in the internal cavity of the suction cup (120), and the cylinder (15) is located below the base plate (121). The piston rod of the cylinder (15) passes through the base plate (121) and extends into the interior of the suction cup (120) and is fixedly connected to the pushing assembly (14).

10. The test method for the height-adjustable table retraction resistance test system according to any one of claims 1-9, characterized in that, Includes the following steps: S1. System calibration: Align the positioning component (12) at the end of the cantilever (10) with the test force surface of the lifting table, adjust the height of the cantilever (10) so that the top working end of the positioning component (12) and the test force surface of the lifting table are kept at a predetermined distance, and the pressure sensor (11) is zeroed and calibrated. S2, Initial state confirmation: Confirm that the top working end of the positioning component (12) is higher than the force-bearing surface of the pressure sensor (11), the top surface of the rocker (13) is parallel to the force-bearing surface of the pressure sensor (11), and the pushing component (14) and the rocker (13) are located at the center of the positioning component (12). S3, Descending Adsorption and Pressure Test: Control the lifting table to descend at a preset speed, so that the test force surface of the lifting table first contacts and presses down on the top of the positioning component (12). The positioning component (12) generates elastic deformation and adsorbs and fixes itself on the surface of the lifting table to constrain the relative position between the test system and the lifting table. The lifting table continues to descend and squeezes the pressure sensor (11). The pressure sensor (11) collects the resistance pressure data in real time. S4. Obstacle detection and data recording: When the pressure value collected by the pressure sensor (11) reaches the preset threshold, the lifting table is determined to trigger the obstruction and retraction function, and the current pressure peak value and the displacement of the lifting table are recorded; if the lifting table does not trigger retraction within the preset conditions, it is recorded as unqualified and the test is stopped. S5, Retraction and Disengagement: When the test is completed and the lifting table rises and retracts, the cylinder (15) is activated. The movable end of the cylinder (15) extends and drives the pushing component (14) to move the pry bar (13) from the center of the positioning component (12) to its edge. The pry bar (13) wedges into the interface between the positioning component (12) and the surface of the lifting table to break the adsorption state. At the same time, the lifting table continues to rise, so that the test system is completely separated from the lifting table. S6, System Reset: The movable end of the cylinder (15) retracts, driving the pushing component (14) and the rocker (13) to reset to the center position of the positioning component (12). The positioning component (12) recovers to its initial shape by its own elasticity and waits for the next test.

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