A lifting table leg load capacity testing device

Abstract

The application discloses a lifting table leg load capacity testing device and relates to the technical field of lifting tables, which comprises a rack and a controller; a testing platform and a load module for providing load for a table leg assembly are arranged on the rack; the load module comprises a vertical load assembly and a load sharing assembly; the vertical load assembly is arranged on the axis direction of the table leg assembly so as to abut against the vertical load assembly after the table leg assembly is elongated; the load sharing assembly comprises a frame assembly connected with the rack; a load sharing plate is slidingly arranged on the frame assembly and a switching mechanism for driving the load sharing plate to switch between a first station and a second station is further arranged on the load sharing plate; the device solves the problem that single table leg independent testing and paired table leg cooperative load testing cannot be simultaneously realized in the prior art, and achieves the comprehensive product quality detection under the working condition that two table legs jointly bear loads in a real use scenario.

Description

Technical Field

[0001] This invention relates to the field of height-adjustable desk technology, and more specifically, to a test device for the load-bearing performance of height-adjustable desk legs. Background Technology

[0002] Currently, height-adjustable desks on the market are usually equipped with two legs. The load-bearing performance of height-adjustable desk legs is generally tested using specialized testing equipment. The purpose is to allow the desk leg under test to complete the height adjustment action under actual load conditions, and to evaluate its load-bearing capacity through synchronous monitoring of mechanical load and electrical parameters.

[0003] In existing technologies, such as the patent with publication number CN211784244U, a testing device is disclosed. This testing device is mainly used to test the quality of a single height-adjustable table leg, such as compressive strength and lifting performance, but it cannot perform overall testing on the coordinated load-bearing capacity of a pair of table legs. Therefore, this testing method is difficult to simulate the working conditions in actual use scenarios where two table legs jointly bear the tabletop and heavy objects. This may lead to uneven stress and insufficient stability in actual use of the assembled height-adjustable table, affecting product quality and safety.

[0004] Patent CN113029546A discloses a testing bench with two or more installation stations capable of simultaneously placing two adjustable table legs to be tested. However, the load-bearing capacity of each table leg is independent, still only providing load-bearing capacity for a single table leg, and cannot achieve complete testing. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a test device for the load-bearing performance of lifting table legs.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a test device for the load-bearing performance of lifting table legs, comprising: a frame and a controller; the frame is provided with a test platform and a load-bearing module for providing load to table leg components, the load-bearing module including a vertical load-bearing component and a load-sharing component; the vertical load-bearing component is disposed along the axial direction of the table leg components so that the table leg components abut against the vertical load-bearing component after extension; the load-sharing component includes a frame component connected to the frame, a load-sharing plate is slidably mounted on the frame component, and a switching mechanism is also provided thereon to drive the load-sharing plate to switch between a first station and a second station; in the first station, the load-sharing plate is located between the vertical load-bearing component and the table leg components, so that the two table leg components share the same load; in the second station, the load-sharing plate is moved out to test a single table leg component; the test platform is provided with a positioning fixture for fixing the table leg components and a servo motor for driving the table leg components to rise and fall; the controller is electrically connected to the switching mechanism and the servo motor.

[0008] By adopting the above technical solution, selective load testing of single or two table leg components was achieved, improving the testing flexibility and applicability of the equipment.

[0009] According to one embodiment of the present invention, a dynamic testing assembly is further installed on the frame. The dynamic testing assembly includes six sets of test cylinders connected to the frame, which divide the load-sharing plate into six test areas. Each test area of ​​the load-sharing plate corresponds to a set of test cylinders.

[0010] By adopting the above technical solution, the dynamic load of different areas of the desktop can be simulated, and the performance test of the table leg components under complex working conditions can be realized.

[0011] According to one embodiment of the present invention, the vertical load-bearing assembly includes a load box and an adjustment mechanism; load blocks are stacked inside the load box, and the adjustment mechanism removes or places load blocks from the load box to control the number of load blocks inside the load box; the vertical load-bearing assembly is further provided with a first slide rail mechanism for guiding the load box; the first slide rail mechanism is mounted on a test platform.

[0012] By adopting the above technical solution, the number of load blocks can be precisely controlled, and the test load can be adjusted in stages to ensure test accuracy.

[0013] According to one embodiment of the present invention, the adjustment mechanism includes a support plate mounted on the top of the frame, and a telescopic part corresponding to the load box is mounted on the support plate; multiple guide wheel sets are provided on both sides of the load box, and each guide wheel set has two guide wheels; the first slide rail mechanism includes a guide rail mounted on the test platform and adapted to the guide wheel sets on both sides of the load box; an adjustment plate adapted to the guide rails on both sides is provided above the load box, and an adjustment rod is connected to the bottom of the adjustment plate; a pin hole is provided through the side wall of the load block, and a first insertion hole for inserting the lower end of the adjustment rod is provided in the middle of the load block; a second insertion hole corresponding to the pin hole is provided through the circumferential side wall of the adjustment rod; one end of the telescopic part is hinged to the upper end face of the adjustment plate.

[0014] By adopting the above technical solution, the adjustment rod, top pressure block and load block can be quickly positioned and fixed, thus improving the load adjustment efficiency.

[0015] According to one embodiment of the present invention, the bottom of the load-bearing box is connected to a top pressing block that abuts against the table leg assembly. A third insertion hole corresponding to the second insertion hole is provided through the side wall of the top pressing block. A fourth insertion hole communicating with the first insertion hole is provided on the top pressing block. The third insertion hole and the fourth insertion hole are arranged to cross each other.

[0016] By adopting the above technical solution, the stable force transmission between the load-bearing box and the table leg assembly is ensured, and stress concentration is avoided during the test.

[0017] According to one embodiment of the present invention, the frame assembly further includes a second slide rail mechanism, which includes four rails mounted on the test platform; each rail is connected to a sliding support block, the sliding support block having a slide groove and a positioning groove; the load-bearing shared plate has two crossbeams, and three longitudinal beams are connected between the two crossbeams; the bottom end of each crossbeam is connected to a slide bar adapted to the slide groove, and both ends of the slide bar have positioning protrusions adapted to the positioning groove; when the load-bearing shared plate moves to the first station or the second station, the positioning groove and the positioning protrusion are adapted to each other.

[0018] By adopting the above technical solution, the smooth sliding and precise positioning of the load-bearing shared board were achieved, ensuring the reliability of test mode switching.

[0019] According to one embodiment of the present invention, the switching mechanism includes an electric push rod mounted on any sliding support block, the electric push rod being arranged along the direction of the crossbeam, and one end of the electric push rod being hinged to the side wall of the nearest longitudinal beam.

[0020] By adopting the above technical solution, the automatic switching of the load-bearing shared board was realized, improving testing efficiency and ease of operation.

[0021] According to one embodiment of the present invention, the portion of the crossbeam and longitudinal beam of the load-bearing shared plate that intersects and overlaps constitutes a test area, and the test cylinder is fixedly connected to the load-bearing plate via a bracket.

[0022] By adopting the above technical solution, the independence and accuracy of the load in each area during dynamic testing are ensured, simulating real-world usage scenarios.

[0023] According to one embodiment of the present invention, the test platform includes a bottom plate and a top plate arranged vertically and connected to a frame. The bottom plate is provided with a limiting seat for limiting the bottom of the table leg assembly. A servo motor is installed on one side of the limiting seat and its output end is connected to the internal drive element of the table leg assembly.

[0024] By adopting the above technical solution, the table leg assembly is stably fixed and its height is controlled, which can simulate load tests under different elongation states.

[0025] According to one embodiment of the present invention, the top plate is provided with a contoured groove for supporting the table leg assembly, and the height of the top plate is set lower than the height of the stationary sleeve in the table leg assembly.

[0026] By adopting the above technical solution, the table leg components are prevented from being subjected to additional support force during the test, thus ensuring the authenticity of the test results.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By combining the load-bearing shared components with the switching mechanism, the problem of not being able to simultaneously achieve independent testing of a single table leg and collaborative load-bearing testing of the entire set of table legs in existing technologies is solved. It can simulate the working conditions of two table legs bearing the load together in real-world usage scenarios, avoiding the problem of insufficient stability after assembly due to individual testing, and improving the comprehensiveness of product quality testing.

[0029] 2. By setting up six sets of test cylinders and six test areas in the dynamic test component, the load test of dynamic off-center load in different areas of the desktop can be realized. It can reproduce the continuous load change during the movement of heavy objects and improve the testing capability of table leg components under complex working conditions.

[0030] 3. By adjusting the combination structure of the mechanism and the load box, the number of load blocks can be adjusted by the cooperation of the adjusting rod, the positioning pin and multiple sets of holes, and the first slide rail mechanism can be used to ensure the stability of the load adjustment and the accuracy of the test results. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of a lifting table leg load-bearing performance testing device according to Embodiment 1 of the present invention;

[0032] Figure 2 This is a schematic diagram of the vertical load-bearing component in a load-bearing performance testing device for lifting table legs according to Embodiment 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the load-bearing box in a load-bearing performance testing device for lifting table legs according to Embodiment 1 of the present invention;

[0034] Figure 4 This is a partial structural schematic diagram of the vertical load-bearing component in a load-bearing performance testing device for lifting table legs according to Embodiment 1 of the present invention;

[0035] Figure 5 yes Figure 2 A partial structural diagram of the medium-load block under lifting conditions;

[0036] Figure 6 yes Figure 5 A structural diagram of the adjusting screw, adjusting plate, and adjusting rod;

[0037] Figure 7 This is a schematic diagram of the load-bearing shared component in a load-bearing performance testing device for lifting table legs according to Embodiment 1 of the present invention;

[0038] Figure 8 This is a schematic diagram of the installation structure of the slide bar and the load-bearing shared plate in a lifting table leg load-bearing performance testing device according to Embodiment 1 of the present invention;

[0039] Figure 9yes Figure 7 A magnified view of a section at point A in the middle;

[0040] Figure 10 This is a schematic diagram of the positioning fixture in a load-bearing performance testing device for lifting table legs according to Embodiment 1 of the present invention;

[0041] Figure 11 This is a three-dimensional structural diagram of a lifting table leg load-bearing performance testing device according to Embodiment 2 of the present invention;

[0042] Figure 12 This is a structural schematic diagram of a lifting table leg load-bearing performance testing device in the main view state according to Embodiment 2 of the present invention;

[0043] Figure 13 This is a partial structural schematic diagram of the dynamic testing component in a lifting table leg load-bearing performance testing device according to Embodiment 2 of the present invention;

[0044] Figure 14 This is a schematic diagram of a hypothetical desktop based on a weighted shared board and the division of areas on it.

[0045] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Load-bearing module; 201. Vertical load-bearing assembly; 2011. Telescopic part; 20111. Adjusting screw; 2012. Bearing plate; 2013. Positioning pin; 2014. First slide rail mechanism; 20141. Guide rail; 20142. Guide wheel; 2015. Adjusting plate; 20151. Adjusting rod; 20152. Second insertion hole; 2016. Load-bearing box; 2017. Load-bearing block; 20171. First insertion hole; 20172. Pin hole; 2018. Top pressure block; 20181. Third insertion hole; 20182. Fourth insertion hole; 202 1. Load-bearing shared plate; 2021. Crossbeam; 2022. Longitudinal beam; 203. Switching mechanism; 2031. Electric push rod; 2032. Support frame; 204. Second slide rail mechanism; 2041. Sliding support block; 20411. Slide groove; 20412. Positioning groove; 2042. Track; 2043. Slide bar; 20431. Positioning protrusion; 3. Test platform; 301. Top plate; 302. Bottom plate; 3011. Contouring groove; 4. Table leg assembly; 401. Sleeve; 5. Servo motor; 6. Limit seat; 7. Dynamic test assembly; 701. Test cylinder; 702. Bracket. Detailed Implementation

[0046] 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.

[0047] Example 1, please refer to Figure 1 The testing equipment in this embodiment includes a frame 1, a load-bearing module 2, a test platform 3, a servo motor 5, and a controller. The frame 1 is an integral frame structure, welded from Q235 steel plate. Its top is used to install the load-bearing components of the load-bearing module 2, the middle is used to fix the test platform 3, and the bottom is fixed to the ground by anchor bolts to ensure the overall stability of the equipment during operation.

[0048] Please see Figures 2 to 10 The test platform 3 is installed in the middle area of ​​the frame 1, including a top plate 301 and a bottom plate 302 arranged in parallel. Both are fixedly connected to the column of the frame 1 by bolts. The upper end surface of the top plate 301 is provided with a contour groove 3011 that is adapted to the outer wall of the table leg assembly 4, which is used to support and limit the middle part of the table leg assembly 4. The height of the top plate 301 is lower than the height of the sleeve 401 when the table leg assembly 4 is in a stationary state, so as to avoid interfering with the lifting and lowering action of the table leg assembly 4.

[0049] A limiting seat 6 is fixed on the upper surface of the base plate 302. The limiting seat 6 has a positioning hole that matches the bottom of the table leg assembly 4, which is used to axially limit the bottom of the table leg assembly 4. The servo motor 5 is installed on one side of the limiting seat 6 through a motor bracket. Its output end is connected to the drive element (such as a lifting screw) inside the table leg assembly 4 through a coupling, which is used to drive the table leg assembly 4 to extend and retract in the vertical direction.

[0050] The load-bearing module 2 is located directly above the test platform 3 and connected to the top of the rack 1. Specifically, the load-bearing module 2 includes a vertical load-bearing component 201 and a load-bearing sharing component.

[0051] Please see Figures 2 to 6 The vertical load-bearing component 201 is arranged along the axial direction of the table leg component 4 to provide an adjustable vertical uniform load. The vertical load-bearing component 201 includes a load box 2016, an adjustment mechanism, and a first slide rail mechanism 2014.

[0052] Specifically, the weight box 2016 has a rectangular box structure with an opening at the top. Inside, multiple weight blocks 2017 of uniform size are stacked vertically. In this embodiment, the weight of a single weight block 2017 is 5kg, but it can be replaced according to the test requirements during actual operation. The bottom of the weight box 2016 is fixed with a top pressure block 2018 by bolts. The top pressure block 2018 is made of polyurethane material, and its lower end is used to abut against the table leg assembly 4 or the weight sharing plate 202 to avoid rigid contact that could damage the test piece.

[0053] The weight block 2017 has a first insertion hole 20171 axially opened in the middle, and a pin hole 20172 is opened through the side wall in the horizontal direction; the top pressing block 2018 has a fourth insertion hole 20182 coaxially connected to the first insertion hole 20171 in the middle, and a third insertion hole 20181 coaxially corresponding to the pin hole 20172 is opened in the side wall, and the third insertion hole 20181 and the fourth insertion hole 20182 are cross-connected.

[0054] The adjustment mechanism is used to adjust the number of load blocks 2017 inside the load box 2016, thereby controlling the load weight. The adjustment mechanism includes a bearing plate 2012, a telescopic part 2011, an adjustment plate 2015, and a positioning pin 2013.

[0055] Specifically, the support plate 2012 is a rectangular steel plate, which is horizontally fixed to the top crossbeam of the frame 1 by bolts; the telescopic part 2011 adopts a DT50 screw motor, which is vertically fixed to the lower end face of the support plate 2012 by bolts, and its output end is an adjusting screw 20111. The lower end of the adjusting screw 20111 is hinged to the upper end face of the adjusting plate 2015 through a hinge, which can realize the vertical lifting and lowering of the adjusting plate 2015; the adjusting plate 2015 is a rectangular steel plate, and an adjusting rod 20151 is fixed to the center of the lower end face of the adjusting plate 2015 by welding. The outer diameter of the adjusting rod 20151 is adapted to the inner diameter of the first insertion hole 20171 and the fourth insertion hole 20182. Multiple second insertion holes 20152 are opened through its circumferential sidewall in the horizontal direction, and the diameter of the second insertion holes 20152 is the same as that of the pin hole 20172 and the third insertion hole 20181.

[0056] The positioning pin 2013 is made of 45 steel and its outer diameter is adapted to the pin hole 20172. It is used to insert into the aligned second pin hole 20152, pin hole 20172 and third pin hole 20181 to fix the adjusting rod 20151 with the top pressure block 2018 and the load block 2017.

[0057] The first slide rail mechanism 2014 is used to guide the vertical movement of the load box 2016 and prevent load deviation. The first slide rail mechanism 2014 includes a guide rail 20141 and a guide wheel set.

[0058] Furthermore, in this embodiment, the guide rail 20141 can be two parallel T-shaped guide rails, which are vertically fixed to the upper end face of the top plate 301 of the test platform 3 by bolts and symmetrically distributed on both sides of the load box 2016. Each side guide rail 20141 corresponds to two sets of guide wheel groups, each set containing two vertically arranged guide wheels 20142. The guide wheels 20142 are installed on the side wall of the load box 2016 through wheel axles, and their wheel grooves are adapted to the protrusions of the guide rail 20141, allowing them to roll along the guide rail 20141. To ensure the stability of the load box 2016 during the rolling process, the bottom of the load box 2016 is equipped with two damping wheels, which respectively abut against the sides of the two guide rails 20141 that are close to each other. Next, the damping wheel is made of wear-resistant rubber material and is bolted to both sides of the bottom of the load box 2016. Its contact surface fits tightly with the protruding part of the guide rail 20141 to prevent the load box 2016 from shaking when it moves vertically or when the load changes.

[0059] Please see Figures 7 to 9 The load-sharing component includes a frame assembly connected to the rack 1. A load-sharing plate 202 is slidably mounted on the frame assembly in the vertical direction. The frame assembly is equipped with a switching mechanism 203 for driving the load-sharing plate 202 to move horizontally. When the switching mechanism 203 drives the load-sharing plate 202 to the first station, the load-sharing plate 202 is located between the vertical load-sharing component 201 and the table leg component 4, and the two table leg components 4 share the same load. When the switching mechanism 203 drives the load-sharing plate 202 to the second station, the load-sharing plate 202 moves out from between the vertical load-sharing component 201 and the table leg component 4 to test a single table leg component 4. That is, the load-sharing component is used to switch between individual testing and complete testing of the table leg component 4. It mainly includes the frame assembly, the load-sharing plate 202, the switching mechanism 203, and the second slide rail mechanism 204.

[0060] Specifically, the frame assembly consists of four vertical columns, which are bolted to the upper surface of the top plate 301 of the test platform 3 for mounting the second slide rail mechanism 204; the load-bearing shared plate 202 is made of aluminum alloy profiles and includes two parallel crossbeams 2021 and three vertical longitudinal beams 2022 connected between the crossbeams 2021 to form a grid structure; the lower end of the crossbeams 2021 is bolted with a slide bar 2043, and both ends of the slide bar 2043 are integrally formed with hemispherical positioning protrusions 20431; the second slide rail mechanism 204 is used to guide the horizontal sliding of the load-bearing shared plate 202 and includes a track 2042 and a sliding support block 2041.

[0061] Furthermore, the track 2042 consists of four parallel rectangular tracks, which are fixed to the top of the column of the frame assembly by bolts. Next, two sliding support blocks 2041 are slidably connected to each track 2042. The upper end face of the sliding support block 2041 is provided with a groove 20411 that matches the slide bar 2043. The inner wall of the groove 20411 is provided with a positioning groove 20412 that matches the positioning protrusion 20431. The grooves 20411 on the upper end face of the sliding support blocks 2041 on both sides are respectively provided with positioning grooves 20412 corresponding to the first and second work positions. That is, when the load-bearing shared plate 202 is moved to the first or second work position, the positioning groove 20412 matches the positioning protrusion 20431, which makes it convenient to limit the load-bearing shared plate 202 to the first or second work position.

[0062] The switching mechanism 203 adopts an electric push rod 2031 of model DT30. The electric push rod 2031 is installed on the side wall of any sliding support block 2041 through a support frame 2032, and the support frame 2032 and the sliding support block 2041 are set as an integral structure to improve stability. The extension and retraction direction of the electric push rod 2031 is parallel to the crossbeam 2021, and the output end of the electric push rod 2031 is hinged to the side wall of the nearest longitudinal beam 2022 through a hinge, which is used to drive the load-sharing plate 202 to slide along the slide groove 20411, thereby actively switching the load-sharing plate 202 to the first station and the second station.

[0063] The elongation of the table leg assembly 4 is detected by installing position sensors on the test platform 3. The controller is a PLC controller (model S7-200SMART). Its signal input terminal is connected to the position sensor on the test platform 3, and its signal output terminal is electrically connected to the servo motor 5, the telescopic part 2011, and the electric push rod 2031 through wires. It is used to receive position signals and control the actions of each actuator.

[0064] The static load testing device in this embodiment is mainly used to test the performance of the table leg assembly 4 under vertical axial load, and can realize both individual testing and complete set testing modes.

[0065] When adjusting the load, please refer to [link / reference]. Figure 3In the initial state, the positioning pin 2013 is inserted into the first insertion hole 20171 at the bottom of the adjusting rod 20151. At this time, the weight of all the load blocks 2017 is supported by the positioning pin 2013 through the adjusting plate 2015 and the adjusting rod 20151. Specifically, the lower end of the adjusting rod 20151 is sequentially inserted into the fourth insertion hole 20182 of the top pressing block 2018 and the first insertion hole 20171 of all the load blocks 2017. At this time, the second insertion hole 20152, the third insertion hole 20181 and all the pin holes 20172 are coaxially aligned. The positioning pin 2013 is inserted into the above holes to fix the adjusting rod 20151, the top pressing block 2018 and all the load blocks 2017 into one unit. The load box 2016 is in the maximum load state. When the adjusting rod 20151 is lifted upward, the table leg assembly 4 is not under pressure.

[0066] See Figure 4 , Figure 5 When the test is started, the drive mechanism drives the adjusting rod 20151 to move upward. Since the top of the adjusting plate 2015 is hinged to the adjusting rod 20151, its bottom end will push up a certain number of load blocks 2017, causing them to disengage from the support of the positioning pin 2013. At this time, the weight of the remaining load blocks 2017 in the load box 2016 is the effective test load, which is transferred to the table leg assembly 4 through the top pressure block 2018 at the bottom of the load box 2016, the test platform 3, or the load sharing plate 202.

[0067] See Figure 6 By inserting the positioning pin 2013 into the second socket 20152 at different heights, the number of weight blocks 2017 that are lifted can be changed, thereby achieving graded adjustment of the test load. That is, the higher the positioning pin 2013 is inserted, the more weight blocks 2017 are lifted, and the fewer weight blocks 2017 are pulled out by the adjusting rod 20151, resulting in a larger effective test load; conversely, the lower the insertion position, the smaller the effective test load.

[0068] For individual testing, refer to Figure 7 As shown, by moving the load-bearing shared plate 202, its positioning groove 20412 engages with the positioning protrusion 20431 on the slide bar 2043 corresponding to the second working position, meaning the load-bearing shared plate 202 moves out from between the vertical load-bearing components 201 and the table leg components 4. At this time, the load-bearing shared plate 202 exits the force transmission path between the two vertical load-bearing components 201 and the two table leg components 4. The two vertical load-bearing components 201 work independently, allowing for load testing of the two table leg components 4 separately.

[0069] For complete set testing, please refer to [the relevant documentation]. Figure 7The load-bearing shared plate 202 is slidable so that its positioning groove 20412 engages with the positioning protrusion 20431 on the slide bar 2043 corresponding to the first work position. At this time, the load-bearing shared plate 202 is simultaneously positioned between the left vertical load-bearing component 201 and the right table leg component 4, and between the right vertical load-bearing component 201 and the left table leg component 4, forming a cross support. When one vertical load-bearing component 201 is loaded, its load is distributed to the two table leg components 4 through the load-bearing shared plate 202, simulating the situation where two table legs share the load under a real tabletop connection, and realizing the static consistency test of the complete set of table legs.

[0070] Example 2, please refer to Figure 11 and Figure 12 This embodiment is based on the static load testing device of Embodiment 1, with the addition of a dynamic testing component 7 to simulate the complex working conditions of different areas of the desktop under load. The remaining structures, such as the frame 1, the test platform 3, the vertical load component 201, the load sharing component, the servo motor 5, and the controller, are completely consistent with Embodiment 1, and therefore will not be described in detail.

[0071] Please see Figure 13 The dynamic test component 7 includes a test cylinder 701 and a bracket 702; wherein, the test cylinder 701 is a magnetic ring cylinder of model SC63×50, and a total of six groups are set, with a polyurethane pressure head installed at the output end of each group of cylinders.

[0072] Please see Figure 14 A hypothetical desktop is set up based on the load-bearing shared plate 202. Six sets of test cylinders 701 correspond to six test areas on the hypothetical desktop: upper left, upper center, upper right, lower right, lower center, and lower left, simulating non-uniform load. Furthermore, the support 702 is an L-shaped steel plate support. One end of each support 702 is fixed to the lower end face of the bearing plate 2012 with bolts, and the other end is fixed to the cylinder body of the test cylinder 701 with bolts, ensuring that the output ends of the six test cylinders 701 are aligned with the center of the corresponding test area. The piston rod of each test cylinder 701 is set vertically downwards. The signal output terminal of the controller is electrically connected to the solenoid valves of the six sets of test cylinders 701 to control the extension and retraction of the cylinders.

[0073] This embodiment is used to conduct dynamic, asymmetric load tests on the table leg assembly 4 to simulate the daily use scenario of heavy objects moving on the table.

[0074] First, the table leg assembly 4 is fixed to the frame 1 using a positioning fixture. According to the test requirements, the height of the sliding support block 2041 on the column is adjusted so that the table leg assembly 4 is in different states, such as not extended, half-extended, or at its maximum extension. The load-bearing shared plate 202 is slid to the first station to perform dynamic testing.

[0075] Next, the dynamic testing program is started. The multiple test cylinders 701 of the dynamic testing component 7 operate sequentially according to a preset order to simulate the continuous movement of a heavy object in different areas of the table. After the piston rod of each test cylinder 701 is pressed down, the pressure is held for 3 to 5 seconds to simulate the brief pause of the heavy object in the corresponding area. The holding time can be set according to the actual use scenario.

[0076] The specific mechanism for each dynamic test is as follows:

[0077] The piston rod of the first test cylinder is pressed down, acting on the "upper left" test area of ​​the illusory desktop defined by the load-sharing plate 202 and held for 3 to 5 seconds to simulate the brief stay of the weight in that area.

[0078] After the first test cylinder holds pressure for 3 to 5 seconds, the piston rod of the second test cylinder is pressed down to the "upper middle" test area and holds pressure for 3 to 5 seconds. At the same time, the piston rod of the first test cylinder is raised and reset, realizing the simulation of continuous movement of the weight from the "upper left" test area to the "upper middle" test area.

[0079] After the second test cylinder holds pressure for 3 to 5 seconds, the piston rod of the third test cylinder is pressed down to the "upper right" test area and held for 3 to 5 seconds; at the same time, the piston rod of the second test cylinder is raised and reset, realizing the simulation of continuous movement of the heavy object.

[0080] The following steps are performed sequentially: the fourth test cylinder presses down into the "lower right" test area and holds pressure for 3 to 5 seconds; the fifth test cylinder presses down into the "lower middle" test area and holds pressure for 3 to 5 seconds; and the sixth test cylinder presses down into the "lower left" test area and holds pressure for 3 to 5 seconds. Each test cylinder 701 activates after the previous test cylinder 701 finishes holding pressure and rises and resets during the next test cylinder 701's pressure holding period, forming a continuous dynamic load cycle.

[0081] Finally, after the sixth test cylinder holds pressure for 3 to 5 seconds, the first test cylinder presses down again into the "upper left" test area and holds pressure for 3 to 5 seconds, while the piston rod of the sixth test cylinder rises and resets. This completes one full dynamic test cycle.

[0082] To comprehensively evaluate the dynamic load-bearing performance of table leg assembly 4, the aforementioned dynamic test cycle must be performed under three typical operating conditions: its unextended state, its state at 50% maximum elongation, and its state at maximum elongation. This test ensures that table leg assembly 4 can withstand dynamic off-center loads under different usage conditions, demonstrating structural stability and durability.

[0083] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A test device for the load-bearing performance of adjustable table legs, characterized in that, include: Rack (1) and controller; The rack (1) is provided with a test platform (3) and a load-bearing module (2) for providing load for the table leg assembly (4), the load-bearing module (2) including a vertical load-bearing component (201) and a load-bearing sharing component; The vertical load-bearing component (201) is positioned along the axis of the table leg assembly (4) so ​​that the table leg assembly (4) can abut against the vertical load-bearing component (201) after it is extended. The load-sharing component includes a load-sharing plate (202) and a frame assembly connected to the frame (1). A second slide rail mechanism (204) is slidably mounted on the frame assembly in the vertical direction. The load-sharing plate (202) is mounted on the second slide rail mechanism (204). The second slide rail mechanism (204) is used to guide the horizontal sliding of the load-sharing plate (202). The frame assembly is also provided with a switching mechanism (203) that drives the load-sharing plate (202) to switch between the first station and the second station. In the first station, the load-sharing plate (202) is located between the vertical load-sharing component (201) and the table leg component (4), so that the two table leg components (4) share the same load. In the second station, the load-sharing plate (202) is removed from the middle so as to detect a single table leg component (4). The test platform (3) is equipped with a positioning fixture for fixing the table leg assembly (4) and a servo motor (5) for driving the table leg assembly (4) to rise and fall. The controller is electrically connected to the switching mechanism (203) and the servo motor (5).

2. The load-bearing performance testing device for lifting table legs according to claim 1, characterized in that: The frame (1) is also equipped with a dynamic testing component (7), which includes six sets of test cylinders (701) connected to the frame (1) to divide the load-sharing plate (202) into six test areas. Each test area of ​​the load-sharing plate (202) corresponds to a set of test cylinders (701).

3. The load-bearing performance testing device for lifting table legs according to claim 2, characterized in that: The vertical load-bearing assembly (201) includes a load-bearing box (2016) and an adjustment mechanism; The load cell (2016) contains stacked load blocks (2017), and the adjustment mechanism removes or places load blocks (2017) from the load cell (2016) to control the number of load blocks (2017) in the load cell (2016); the vertical load assembly (201) is also provided with a first slide rail mechanism (2014) to guide the load cell (2016); the first slide rail mechanism (2014) is installed on the test platform (3).

4. The load-bearing performance testing device for lifting table legs according to claim 3, characterized in that: The adjustment mechanism includes a support plate (2012) installed on the top of the frame (1) and a telescopic part (2011) corresponding to the load box (2016) is installed on the support plate (2012). The load cell (2016) has multiple guide wheel sets on both sides, and each guide wheel set has two guide wheels (20142). The first slide rail mechanism (2014) includes a guide rail (20141) installed on the test platform (3) and adapted to the guide wheel sets on both sides of the load cell (2016). The upper part of the load box (2016) is provided with an adjustment plate (2015) adapted to the guide rails (20141) on both sides. The bottom of the adjustment plate (2015) is connected to an adjustment rod (20151). The side wall of the load block (2017) is provided with a pin hole (20172) and the middle part of the load block (2017) is provided with a first insertion hole (20171) for the lower end of the adjustment rod (20151) to be inserted. The circumferential side wall of the adjustment rod (20151) is provided with a second insertion hole (20152) corresponding to the pin hole (20172). One end of the telescopic part (2011) is hinged to the upper end face of the adjusting plate (2015).

5. A test device for the load-bearing performance of a height-adjustable table leg according to any one of claims 2 to 4, characterized in that: The bottom of the load box (2016) of the vertical load-bearing component (201) is connected to a top pressure block (2018) that abuts against the table leg component (4). A third socket (20181) corresponding to the second socket (20152) is provided through the side wall of the top pressure block (2018). A fourth socket (20182) communicating with the first socket (20171) is provided on the top pressure block (2018). The third socket (20181) and the fourth socket (20182) are arranged to cross each other.

6. The load-bearing performance testing device for lifting table legs according to claim 5, characterized in that: The frame assembly is further provided with a second slide rail mechanism (204), which includes four rails (2042) installed on the test platform (3); each rail (2042) is connected to a sliding support block (2041), and the sliding support block (2041) is provided with a sliding groove (20411) and the sliding groove (20411) is also provided with a positioning groove (20412); The load-sharing plate (202) has two crossbeams (2021) and three longitudinal beams (2022) connecting the two crossbeams (2021). The bottom end of the crossbeam (2021) is connected to a slide bar (2043) that is compatible with the slide groove (20411). The two ends of the slide bar (2043) are provided with positioning protrusions (20431) that are compatible with the positioning groove (20412). When the load-sharing plate (202) moves to the first station or the second station, the positioning groove (20412) and the positioning protrusion (20431) are compatible.

7. The load-bearing performance testing device for lifting table legs according to claim 6, characterized in that: The switching mechanism (203) includes an electric push rod (2031) mounted on any sliding support block (2041), the electric push rod (2031) being arranged along the direction of the crossbeam (2021), and one end of the electric push rod (2031) being hinged to the side wall of the nearest longitudinal beam (2022).

8. The load-bearing performance testing device for lifting table legs according to claim 7, characterized in that: The overlapping portion of the crossbeam (2021) and longitudinal beam (2022) on the load-bearing shared plate (202) is a test area, and the test cylinder (701) is fixedly connected to the bearing plate (2012) through the bracket (702).

9. The load-bearing performance testing device for lifting table legs according to claim 8, characterized in that: The test platform (3) includes a bottom plate (302) and a top plate (301) arranged vertically and connected to the frame (1). The bottom plate (302) is provided with a limiting seat (6) for limiting the bottom of the table leg assembly (4). A servo motor (5) is installed on one side of the limiting seat (6) and its output end is connected to the internal drive element of the table leg assembly (4).

10. The load-bearing performance testing device for lifting table legs according to claim 9, characterized in that: The top plate (301) is provided with a contour groove (3011) for supporting the table leg assembly (4), and the height of the top plate (301) is lower than the height of the sleeve (401) in the table leg assembly (4) which is stationary.

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