Anti-bending performance detection device for plastic-wood material

Abstract

A device for detecting the bending resistance of a plastic-wood material comprises a base, two mounting frames are fixedly connected to the base, a stamping plate controlled to ascend and descend is arranged between the two mounting frames, a test board controlled to move is arranged on the base, two bearing frames controlled to move are arranged on the test board, two pressing frames controlled to rotate are arranged on the test board, and the pressing frames are arranged on the base. A sample wood is placed on the top surfaces of the two bearing frames, the bending resistance of the wood is tested through downward movement of the stamping plate, and the two pressing frames are controlled to rotate to press the broken wood, so that the broken wood is prevented from being fiercely bounced off to damage surrounding personnel and equipment.

Description

Technical Field

[0001] This invention relates to the field of wood bending resistance testing technology, and specifically to a device for testing the bending resistance of wood-plastic composite materials. Background Technology

[0002] Wood-plastic composite (WPC) is an environmentally friendly composite material made from wood fibers (such as wood flour, rice husks, straw, etc.) and thermoplastics (such as PE, PP, PVC, etc.) through mixing, extrusion, or molding processes. It has the natural texture of wood and the corrosion resistance and moisture-proof properties of plastics, and is widely used in outdoor flooring, railings, landscaping, and other fields.

[0003] When in use, wood-plastic composite materials need to withstand loads from people and equipment. Their bending performance is related to their load-bearing capacity and resistance to deformation. It also reflects the fatigue characteristics under long-term stress or repeated loading. Based on the test results, the material composition can be adjusted to improve product performance.

[0004] In the process of testing the bending resistance of wood-plastic composite materials, a three-point bending test is often used. The wood-plastic composite sample is placed horizontally on two support rollers, and a load is applied vertically at the midpoint of the sample to test the peak force at which the sample breaks. During the test, when the wood-plastic composite sample breaks, it violently bounces off due to the sudden release of elastic potential energy. Without protection or pressure, this can cause injury to operators or equipment.

[0005] Therefore, this invention proposes a device for testing the bending resistance of wood-plastic composite materials, which presses the broken wood-plastic composite material sample to prevent it from violently springing open and causing damage to surrounding personnel and equipment. Summary of the Invention

[0006] In response to the problems raised in the background art, the present invention provides a device for testing the bending resistance of wood-plastic composite materials. The present invention will be further described below.

[0007] A device for testing the bending resistance of wood-plastic composite materials includes a base, two mounting brackets fixedly connected to the base, a press plate with controlled lifting between the two mounting brackets, a test platform with controlled movement on the base, two support brackets with controlled movement on the test platform, and two pressing brackets with controlled rotation on the test platform.

[0008] Preferably, the test stand is provided with two lifting frames, each with a receiving frame and two symmetrically distributed connecting brackets. Each connecting bracket has a rotating shaft that passes through it. A first turntable is mounted on each rotating shaft, a connecting rod is mounted on the first turntable, and a second turntable is mounted on the connecting rod. A rotating column is mounted on each lifting frame, and a controlled rotating pressing frame is mounted on the rotating column. The rotating column is fixedly connected to the second turntable. A threaded column is mounted on the rotating shaft, and a pressing frame is mounted on the threaded column. The pressing frame cooperates with the threaded column to enable the pressing frame to rotate.

[0009] Preferably, a third spring is provided between the receiving frame and the lifting frame, and two symmetrically distributed telescopic members are provided on the connecting bracket. The extended ends of the telescopic members are fixedly connected to the extrusion frame, and a fourth spring is provided between the connecting bracket and the extrusion frame. The impact force on the receiving frame is buffered by the third spring and the fourth spring.

[0010] Preferably, the extrusion frame is provided with a protrusion and an inclined surface, the connecting bracket is provided with a pin and an inclined surface, and a seventh spring is provided between the pin and the connecting bracket. The inclined surface of the pin and the inclined surface of the protrusion on the extrusion frame are pressed together. Through the cooperation between the pin and the protrusion on the extrusion frame, the extrusion frame is locked, thereby keeping the pressing frame in pressing action.

[0011] Preferably, the rotating column is provided with a rotating plate, and a fixed plate is keyed to the rotating column. The fixed plate is provided with two symmetrically distributed sliding protrusions, and a pressing frame is provided on the fixed plate. The pressing frame is provided with two symmetrically distributed sliding grooves. The sliding protrusions slide in the sliding grooves of the pressing frame. The pressing frame is in contact with the rotating plate. A fifth spring is provided between the pressing frame and the fixed plate. The pressing frame and the fixed plate form a sliding fit system. The pressing frame is provided with a U-shaped bayonet that fits with the rotating column. A sliding limit block is provided on the bayonet. A sixth spring is provided between the sliding limit block and the bayonet, realizing the assembly of the pressing frame and the dynamic buffering and pressing effect.

[0012] Preferably, the base is provided with two controllable movable adjustment frames, each of which is connected to a lifting frame by fasteners. The test platform is provided with a bidirectional lead screw, one end of each of the two adjustment frames is threaded onto the bidirectional lead screw, and the other end of each of the two adjustment frames is slidably connected to the test platform. The base is provided with an electric push rod, which is keyed to a support platform. A fixed box is provided on the support platform, and a third lead screw is provided on the fixed box. A servo motor is keyed to the third lead screw, and the test platform is threadedly connected to the third lead screw, enabling testing of wood of different sizes.

[0013] Preferably, the mounting bracket is provided with a second lead screw, the stamping plate is threadedly connected to the second lead screw, the base is provided with a controllable movable simulation frame, the simulation frame is equipped with an environmental simulator, the base is equipped with two brackets, the brackets are fixedly connected to the mounting bracket, the bracket is provided with a first lead screw, the first lead screw is threadedly connected to one end of the simulation frame, the bracket is equipped with a stepper motor, the output end of the stepper motor is keyed to a connecting shaft, the connecting shaft is provided with a first helical gear, the connecting shaft is connected to a rotating rod through a trigger assembly, a belt is provided between the rotating rod and the first lead screw, the second lead screw is keyed to a second helical gear, the second helical gear cooperates with the first helical gear to realize the synchronous movement of the simulation frame and the stamping plate.

[0014] Preferably, the triggering component includes an active disk fixed to the connecting shaft, a passive disk on the rotating rod, both the active disk and the passive disk having friction surfaces at their end faces, a limiting disk on the rotating rod, and a first spring between the limiting disk and the passive disk. Through the cooperation of the active disk and the passive disk, the synchronous movement of the simulation frame and the stamping plate is achieved.

[0015] Preferably, the driven plate is provided with a limiting frame, the limiting frame is provided with an inclined block, the stamping plate is provided with a support arm, the support arm is provided with a wedge block, a second spring is provided between the wedge block and the support arm, the wedge block and the inclined block are pressed together, and the power-off and stop action of the simulation frame is realized through the pressing and cooperation of the wedge block and the inclined block.

[0016] Preferably, a third outer shell is detachably installed on the base, and a guide groove is opened on the third outer shell. The inclined block slides in the guide groove. Two sets of first and second outer shells are detachably installed on the test platform. The first and second outer shells are connected by modular snap-fit ​​to form a box, which is intended to protect the relevant components inside the first, second, and third outer shells.

[0017] Beneficial effects: Compared with the prior art, the present invention uses the rotation of the rotating column, rotating plate and fixed plate, and the cooperation of the sliding convex and the sliding groove on the pressing frame to make the pressing frame rotate. The wood is pressed by the rotation of the pressing frame. The wood breaks and bounces off quickly. The bounced wood contacts the pressing frame and drives the pressing frame to move upward. Under the action of the fifth spring, the elastic force generated by the impact of the wood is buffered. Through the cooperation of the pressing frame and the fifth spring, the impact force of the wood breaking is actively buffered, and the pressing effect of the wood is achieved at the same time, avoiding the wood from violently bouncing off and causing damage to surrounding personnel and equipment.

[0018] By using a single output from a stepper motor, along with the cooperation of the second helical gear, the first helical gear, the connecting shaft, the trigger assembly, the rotating rod, and the belt, the second lead screw and the first lead screw rotate synchronously. This allows the lifting and lowering of the stamping plate and the movement of the simulation frame to be synchronized, achieving the dual effects of simulating a high humidity environment and the stamping of the stamping plate.

[0019] By pressing the wedge block and the inclined block, the driven plate moves and disengages from the end face of the driving plate, thereby achieving the stopping effect of the simulation frame, while the stamping plate continues to descend. This achieves the effect of simulating a high humidity environment and the stamping action of the stamping plate being independent of each other. Attached Figure Description

[0020] Figure 1 : A three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 : A schematic diagram of the structure of the relevant components of the simulation frame and the stamping plate linkage in this invention;

[0022] Figure 3 : A schematic diagram of the structure at point A of this invention;

[0023] Figure 4 This invention provides a schematic diagram of the structure of relevant components adapted to the stamping of wood of different sizes.

[0024] Figure 5 : A schematic diagram of the structure of the relevant components that enable the linkage action of the pressing frame in this invention;

[0025] Figure 6 This invention provides a schematic diagram of the structure of the components that enable the pressing frame to move and buffer the impact force received by the receiving frame.

[0026] Figure 7 : A schematic diagram of the structure of the components that enable the dynamic buffering action of the pressing frame in this invention;

[0027] In the diagram: 1-Base, 101-Bracket, 102-Second helical gear, 103-Mounting bracket, 2-Stepper motor, 3-Connecting shaft, 4-Driven disc, 5-Rotating rod, 50-Driven disc, 51-Limiting bracket, 52-Wedge block, 53-First spring, 54-Limiting disc, 6-First lead screw, 7-Belt, 8-Simulation frame, 9-Environmental simulator, 10-Second lead screw, 11-First helical gear, 110-Bearing platform, 12-Stamping plate, 120-Wedge block, 121-Second spring, 122-Support arm, 13-Fixing box, 14-Third lead screw, 141-Servo motor, 15-Testing table, 16 - Bidirectional lead screw, 17- Adjusting frame, 170- First outer shell, 171- Second outer shell, 18- Lifting frame, 19- Supporting frame, 20- Third spring, 21- Pressing frame, 22- Fourth spring, 23- Threaded column, 24- Rotating column, 240- Fixed plate, 241- Fifth spring, 242- Rotating plate, 243- Sliding convexity, 25- Pressing frame, 250- Sliding limit block, 251- Sixth spring, 26- Connecting rod, 27- Connecting bracket, 271- Rotating shaft, 272- First turntable, 273- Second turntable, 274- Telescopic component, 28- Seventh spring, 281- Pin block, 29- Third outer shell. Detailed Implementation

[0028] Next, combine Figures 1-7 A specific embodiment of the present invention will be described in detail below.

[0029] refer to Figure 1 and Figure 2 A device for testing the bending resistance of wood-plastic composite materials includes a base 1, on which two mirror-symmetrical mounting brackets 103 are fixedly connected. A controlled-lifting stamping plate 12 is provided between the two mounting brackets 103, and the stamping plate 12 is kept suspended in a high position before operation. A controllable movable test platform 15 is provided on the base 1, and two controllable movable support brackets 19 are provided on the test platform 15. The two support brackets 19 are distributed left and right on the test platform 15, and the wood sample is supported by the two support brackets 19. Two... The controlled rotation of the pressing frame 25 is located on the sides of the two receiving frames 19. Initially, the two pressing frames 25 are parallel to the receiving frames 19. The rotation of the two pressing frames 25 can form a double-sided pressing structure. The purpose of the pressing frame 25 is to press the broken wood-plastic sample material. The wood sample (hereinafter referred to as: wood) is placed on the top surface of the two receiving frames 19. The pressing plate 12 moves down to test the bending resistance of the wood. The controlled rotation of the two pressing frames 25 presses the broken wood, thereby preventing it from violently springing open and causing damage to surrounding personnel and equipment.

[0030] refer to Figure 5 and Figure 6The rotation of the pressing frame 25 depends on the pressure applied to the receiving frame 19. Obviously, the pressure on the receiving frame 19 depends on the impact of the pressing plate 12 on the wood. To achieve the rotation of the pressing frame 25, this device uses the following linkage: two lifting frames 18 are slidably connected to the test platform 15, and each lifting frame 18 has a receiving frame 19 slidably connected to it. Two symmetrically distributed connecting brackets 27 are fixed to one side wall of each lifting frame 18. Each connecting bracket 27 has a rotating shaft 271 rotatably connected to it, and the rotating shaft 271 passes through the connecting bracket 27. A first turntable 272 is fixedly connected to the bottom end of the rotating shaft 271, and a connecting rod 2 is rotatably connected to the first turntable 272. 6. A second turntable 273 is connected to the connecting rod 26. Rotating columns 24 are connected to both sides of the lifting frame 18. A controlled rotating pressing frame 25 is provided on the rotating column 24. The bottom of the rotating column 24 is fixedly connected to the second turntable 273. That is, the rotating shaft 271, the first turntable 272, the connecting rod 26, the rotating column 24, the second turntable 273, and the pressing frame 25 constitute a rotating linkage structure. The rotating shaft 271 is the rotational power input source of this structure. Through the linkage of the first turntable 272, the connecting rod 26, the rotating column 24, and the second turntable 273, the pressing frame 25 is finally made to rotate, thereby achieving the pressing effect of wood.

[0031] refer to Figure 5 and Figure 6 The rotation of the rotating shaft 271 is achieved through the following design: a threaded post 23 is fixedly connected to the top of the rotating shaft 271, and a pressing frame 21 is rotatably connected to the top of the threaded post 23. The pressing frame 21 is located directly below the bottom plane of the receiving frame 19. The pressing frame 21 is threadedly engaged with the outer wall of the threaded post 23. When the pressing frame 21 moves down and engages with the threaded outer wall of the threaded post 23, the threaded post 23 rotates, thereby causing the rotating shaft 271 to rotate.

[0032] During the testing phase, the stamping plate 12 moves downward, and the wood breaks upon impact. The wood and the support frame 19 are simultaneously pressed downward, and the support frame 19 moves downward to press the pressing frame 21. The pressing frame 21 moves downward and engages with the threads on the outer wall of the threaded column 23. The threaded column 23 rotates, and the linkage shaft 271 rotates. Based on the presence of the first turntable 272, the connecting rod 26, and the second turntable 273, the rotating column 24 is rotated in a controlled manner, which in turn links the pressing frame 25 to rotate. After the pressing frame 25 rotates, it presses the broken end of the wood, preventing the broken wood from being ejected due to violent impact and causing damage to surrounding personnel and equipment.

[0033] refer to Figure 6In the above, considering that the downward movement of the stamping plate 12 has a large impact on the wood and the support frame 19, and the support frame 19 is subjected to the pressure of the pressing frame 21, the pressing frame 21 and related components will be subjected to a large impact force, in order to protect the related components, the following design is made: a third spring 20 is compressed between the support frame 19 and the bottom of the lifting frame 18. When the support frame 19 is pressed down, the third spring 20 deforms, buffering part of the impact force on the support frame 19.

[0034] refer to Figure 5 Each of the connecting brackets 27 has two symmetrically distributed telescopic members 274 fixedly connected to it. The two telescopic members 274 are distributed on the left and right sides of the threaded column 23. The extended ends of the telescopic members 274 are fixedly connected to the extrusion frame 21. A fourth spring 22 is compressed between the connecting bracket 27 and the extrusion frame 21 and is wound around the telescopic member 274. The fourth spring 22 can further buffer the impact force on the receiving frame 19, protect the structural integrity and operational stability of the relevant components, and before the stamping action, the fourth spring 22 can keep the extrusion frame 21 at the top of the threaded column 23, that is, the extrusion frame 21 is stable in the preset position when there is no external load.

[0035] As the pressing frame 21 moves downward under pressure, the fourth spring 22 deforms, the extension end of the telescopic member 274 retracts, and the pressing frame 21 moves downward. Through the linkage of the above-mentioned multiple components, the pressing frame 25 rotates. After rotating, the pressing frame 25 presses down on the broken end of the wood. Considering that the stamping plate 12 applies an instantaneous impact force to the wood, that is, after the wood breaks, the supporting frame 19 is no longer under pressure. Based on the deformation of the fourth spring 22, the connecting bracket 27 will immediately move upward and reset, thereby linkage with the pressing frame 25 to immediately reverse and reset. That is, the pressing frame 25 cancels its pressing effect on the wood. In order to maintain the pressing frame 25 on the wood for a certain period of time... The pressing action ensures that the broken wood does not spring back. This device achieves this through a locking component. The bottom side wall of the pressing frame 21 has a protrusion (not shown in the figure) with an inclined surface. A pin 281 is slidably connected to the connecting bracket 27. The pin 281 passes through the connecting bracket 27. The contact surface between the pin 281 and the protrusion on the pressing frame 21 is an inclined surface. A seventh spring 28 is compressed between the pin 281 and the connecting bracket 27. Through the pressing action of the inclined surface of the pin 281 and the inclined surface of the protrusion on the pressing frame 21, the pressing frame 21 can be stabilized at the bottom of the threaded column 23.

[0036] As the extrusion frame 21 is pressed down, the protrusion on it moves down and presses against the pin 281. With the cooperation of the inclined surface of the pin 281 and the inclined surface of the protrusion on the extrusion frame 21, the pin 281 retracts a certain distance, releasing the constraint on the protrusion on the extrusion frame 21. Under the deformation of the seventh spring 28, the pin 281 moves forward again, pressing and locking the protrusion on the extrusion frame 21 at the bottom of the pin 281. The fourth spring 22 then maintains the compressed state. (The remaining text appears to be a list of components: threaded column 23, rotating shaft 271, first turntable 272, connecting rod 26, and second turntable.) 273. With the linkage of the rotating column 24, the pressing frame 25 maintains the pressing action on the wood. After the measurement is completed, the pin block 281 is manually pulled out in parallel, so that the pin block 281 cancels the pressing action on the protrusion of the pressing frame 21. Under the action of the fourth spring 22, the pressing frame 21 moves upward and resets, the threaded column 23 reverses, and the rotating shaft 271 is controlled to reverse. With the cooperation of the first turntable 272, the connecting rod 26, and the second turntable 273, the rotating column 24 reverses, and then the pressing frame 25 is controlled to reverse and reset to the initial state, which is convenient for subsequent repeated use.

[0037] refer to Figure 5 During the pressing process of the pressing frame 25 on the broken wood, the wood breaks and springs open instantly, generating huge stress between the pressing frame 25 and the wood contact surface. To further buffer this stress, the pressing frame 25 performs dynamic pressing. A rotating plate 242 is fixedly connected to the rotating column 24, and a fixed plate 240 is keyed to the end of the rotating column 24. Two symmetrically distributed sliding protrusions 243 are fixedly connected to the fixed plate 240, and the pressing frame 25 slides on the fixed plate 240. The outer wall of the pressing frame 25 is provided with two symmetrically distributed sliding grooves, and the sliding protrusions 243 slide in the sliding grooves of the pressing frame 25. The bottom of the pressing frame 25 is in contact with the top surface of the rotating plate 242. A fifth spring 241 is compressed between the bottom of the pressing frame 25 and the fixed plate 240, which aims to stabilize the pressing frame 25 on the top of the fixed plate 240 through the fifth spring 241 and the rotating plate 242. The pressing frame 25 and the fixed plate 240 form a sliding fit system.

[0038] The rotating column 24 rotates, and the rotating plate 242 and the fixed plate 240 rotate in a controlled manner. Based on the cooperation between the sliding protrusion 243 and the sliding groove on the pressing frame 25, the pressing frame 25 rotates in linkage. The wood is pressed by the rotation of the pressing frame 25. The wood breaks and bounces away quickly. The bounced wood contacts the pressing frame 25 and drives the pressing frame 25 to move upward. Under the action of the fifth spring 241, the upward movement of the pressing frame 25 is limited. Finally, the fifth spring 241 buffers the elastic force generated by the impact on the wood, so that the pressing frame 25 maintains the pressing effect on the wood. Thus, through the cooperation of the pressing frame 25 and the fifth spring 241, the active buffering of the impact force of the wood breaking is achieved on the one hand, and the pressing effect on the wood is achieved on the other hand.

[0039] refer to Figure 7To facilitate the assembly of the pressing frame 25, a U-shaped bayonet is machined at the bottom of the pressing frame 25. The outer wall of the bayonet cooperates with the rotating column 24. A sliding limit block 250 is slidably connected inside the bayonet. The sliding limit block 250 slides along the side wall of the bayonet. When the sliding limit block 250 moves outward, the bayonet opens, i.e., it is in the unlocked state, which facilitates the installation of the pressing frame 25. When the sliding limit block 250 moves inward, the bayonet closes, i.e., it is in the locked state, which realizes the locking of the pressing frame 25 and the rotating column 24. A sixth spring 251 is provided between the sliding limit block 250 and the bayonet, which is intended to realize the automatic reset of the sliding limit block 250 through the sixth spring 251.

[0040] During assembly, the sliding limit block 250 is moved, the sixth spring 251 deforms, the latch opens, and the pressing frame 25 locks with the rotating column 24. Subsequently, under the action of the sixth spring 251, the sliding limit block 250 moves back to its original position, the latch closes, and the assembly of the pressing frame 25 is completed. That is, the latch of the pressing frame 25 is locked with the rotating column 24, and the bottom of the pressing frame 25 contacts the top surface of the rotating plate 242.

[0041] refer to Figure 5 This device is designed to be compatible with testing timber of different sizes. The distance between the two support frames 19 is adjustable. Specifically, the base 1 is equipped with two controllable movable adjustment frames 17, each of which is connected to a lifting frame 18 via fasteners. The distance between the two lifting frames 18 is adjusted by the movement of the adjustment frames 17. A bidirectional lead screw 16 is connected inside the test platform 15. One end of each of the two adjustment frames 17 is threaded onto the bidirectional lead screw 16, and the other end of each of the two adjustment frames 17 is slidably attached to the top surface of the test platform 15. An independent power source is keyed to the bidirectional lead screw 16. When the power source is activated, the bidirectional lead screw 16 rotates, thereby controlling the movement of the two adjustment frames 17, which in turn controls the movement of the two lifting frames 18, thus achieving the effect of adjusting the distance between the two lifting frames 18. This allows the distance between the two support frames 19 to be adjusted to accommodate timber of different sizes.

[0042] refer to Figure 5 The base 1 is equipped with an electric push rod, and a support platform 110 is keyed to the electric push rod. A fixed box 13 is fixedly connected to the support platform 110. A third lead screw 14 is rotatably connected inside the fixed box 13. A servo motor 141 is keyed to the end of the third lead screw 14. The bottom of the test platform 15 passes through the fixed box 13 and is threadedly connected to the third lead screw 14. When the servo motor 141 is activated, the test platform 15 moves, which in turn moves the bidirectional lead screw 16, the adjustment frame 17, the lifting frame 18, and other related pressing components inside the platform synchronously. The purpose of this design is to facilitate the assembly of the related components of the pressing action.

[0043] By activating the electric push rod on the base 1, the height of the platform 110 can be adjusted, thereby adjusting the height of the fixed box 13 and its components. This is intended to adjust the height according to different types of wood samples, achieving a balance between test adaptability, data accuracy, and operational efficiency, and meeting quality control requirements.

[0044] As mentioned earlier, the stamping plate 12 is raised and lowered in a controlled manner. This device achieves the raising and lowering action of the stamping plate 12 through a lifting assembly. Each mounting bracket 103 is connected to a second lead screw 10. The two ends of the stamping plate 12 are respectively threaded to the left and right second lead screws 10. The raising and lowering of the stamping plate 12 depends on the rotation of the second lead screws 10.

[0045] refer to Figure 2 and Figure 3 Based on the unique hygroscopicity and environmental sensitivity of wood, this device is also equipped with an environmental simulation system during testing to simulate the real-world usage environment of the wood and verify the reliability of its compressive strength under different conditions. Therefore, a controllable movable simulation frame 8 is provided on the base 1, and an environmental simulator 9 is installed on the simulation frame 8. The environmental simulator 9 sprays water on the wood to simulate the compressive strength of the wood under different humidity levels. For cost considerations, the power source for the movement of the simulation frame 8 is combined with the power source for the rotation of the second lead screw 10. Specifically, two symmetrically distributed brackets 101 are installed on the base 1. The brackets 101 are fixedly connected to the mounting frame 103. A first lead screw 6 is connected inside the bracket 101. The first lead screw 6 is threadedly connected to one end of the simulation frame 8. The movement of the simulation frame 8 depends on the rotation of the first lead screw 6. A stepper motor 2 is installed on the bracket 101. The output end of the stepper motor 2... A connecting shaft 3 is keyed to the second lead screw 10. A first helical gear 11 is fixedly connected to the connecting shaft 3. One end of the connecting shaft 3, which passes through the first helical gear 11, is connected to a rotating rod 5 via a trigger assembly. The rotation of the rotating rod 5 depends on the rotation of the connecting shaft 3. The rotating rod 5 and the first lead screw 6 are connected by a belt 7. The rotation of the rotating rod 5 is transmitted to the first lead screw 6 via the belt 7. A second helical gear 102 is keyed to the second lead screw 10. The second helical gear 102 cooperates with the first helical gear 11 to realize the rotation of the second lead screw 10. That is, the stepper motor 2 outputs a single power. Through the cooperation of the second helical gear 102 and the first helical gear 11, the connecting shaft 3, the trigger assembly, the rotating rod 5, and the belt 7, the rotation of the second lead screw 10 and the first lead screw 6 is realized, thereby realizing the lifting action of the stamping plate 12 and the moving action of the simulation frame 8. That is, the stepper motor 2 can achieve the dual effects of stamping and spraying.

[0046] When stepper motor 2 is activated, connecting shaft 3 rotates, and first helical gear 11 rotates under control. The rotation of first helical gear 11 engages with second helical gear 102, causing second helical gear 102 to rotate in conjunction with it. Second lead screw 10 rotates under control, and stamping plate 12 descends from a high position to impact the wood. With the rotation of connecting shaft 3, the rotating rod 5 rotates through the transmission of the trigger component. Based on the presence of belt 7, first lead screw 6 rotates, thereby simulating frame 8 moving laterally. Environmental simulator 9 is activated to uniformly spray water mist (or water droplets) onto the surface of the wood to simulate a high humidity environment and test the compressive strength of the wood in a humid state.

[0047] Specifically, the lateral movement of the simulation frame 8 and the longitudinal descent of the stamping plate 12 are performed synchronously. The device pre-plans the motion path through spatial collision avoidance calculations, and the longitudinal descent stroke of the stamping plate 12 and the lateral movement stroke of the simulation frame 8 are designed differently to ensure that there is no spatial interference between the simulation frame 8 and the stamping plate 12 during their movements.

[0048] Considering that the movements of the simulation frame 8 and the stamping plate 12 are controlled by the main drive source stepper motor 2, and since the strokes of the simulation frame 8 and the stamping plate 12 are different, the stamping plate 12 is still in the working stroke after the simulation frame 8 finishes its movement. Therefore, the simulation frame 8 should remain in the stop position after moving laterally. Only after the stamping plate 12 completes the stamping action can this round of testing be judged to be over. The stop position of the simulation frame 8 requires the first lead screw 6 to remain stationary, and the stationary position of the first lead screw 6 requires the rotating rod 5 to remain stationary.

[0049] After the simulation frame 8 stops, the stamping plate 12 still needs to continue to descend in order to impact the wood. That is, the stamping action of the stamping plate 12 is carried out independently, and the second lead screw 10 needs to keep rotating. The rotation of the second lead screw 10 depends on the continuous meshing of the first helical gear 11 and the second helical gear 102.

[0050] Therefore, it is crucial that the rotating rod 5 remains stationary after the simulation frame 8 completes the set stroke, while the first helical gear 11 and the second helical gear 102 should continue to mesh, and the second lead screw 10 should continue to rotate so that the stamping plate 12 can descend at a constant speed until an impact load is applied to the wood. Thus, this device achieves this through a triggering component.

[0051] refer to Figure 3 The triggering assembly includes an active disk 4 fixed to the connecting shaft 3, and a passive disk 50 slidably connected to the rotating rod 5. The end faces of the active disk 4 and the passive disk 50 are both friction surfaces. The active disk 4 and the passive disk 50 rotate synchronously through the friction generated by the tight contact of their end faces. A limiting disk 54 is fixed to the rotating rod 5. A first spring 53 is compressed between the limiting disk 54 and the passive disk 50. The purpose is to apply an axial thrust to the passive disk 50 through the first spring 53, so that the end face of the passive disk 50 is tightly contacted with the end face of the active disk 4, thereby maintaining transmission stability.

[0052] refer to Figure 2 and Figure 3 The driven disk 50 is connected to a limit frame 51 via an axial sliding key. The rotation of the driven disk 50 does not affect the limit frame 51. An inclined block 52 is fixedly connected to the limit frame 51. Support arms 122 are fixedly connected to both sides of the stamping plate 12. A wedge block 120 is slidably connected to the end of the support arm 122. A second spring 121 is compressed between the wedge block 120 and the end of the support arm 122. The wedge block 120 and the inclined block 52 are pressed together to make the driven disk 50 slide and disengage from the end face of the driving disk 4.

[0053] When stepper motor 2 is activated, connecting shaft 3 and first helical gear 11 are rotated under control, which in turn causes second helical gear 102 to rotate, and second lead screw 10 to rotate under control. The stamping plate 12 descends from a high position to impact the wood. Support arm 122 and wedge block 120 descend synchronously. With the rotation of connecting shaft 3, drive plate 4 rotates. Based on the cooperation between the end faces of drive plate 4 and driven plate 50, and the axial thrust applied by first spring 53 to driven plate 50, driven plate 50 rotates synchronously under control, driving rotating rod 5 to rotate. Based on the presence of belt 7, first lead screw 6 rotates, simulation frame 8 moves laterally, and environmental simulator 9 is activated to spray water mist (or water droplets) onto the wood surface to simulate a high humidity environment.

[0054] When the simulation frame 8 moves to the predetermined position, the wedge block 120 descends and presses against the inclined block 52, causing the limiting frame 51 to move to the left. The driven disk 50 slides to the left, the first spring 53 deforms, and the driven disk 50 moves and disengages from the end face of the driving disk 4. That is, a gap is generated between the driven disk 50 and the driving disk 4, and the driven disk 50 is no longer controlled to rotate. The rotating rod 5 is stationary, and the first lead screw 6 does not rotate under the action of the belt 7, thereby achieving the stopping effect of the simulation frame 8.

[0055] As the simulation frame 8 stops, the stepper motor 2 continues to output power, the first helical gear 11 and the second helical gear 102 continue to mesh, the second lead screw 10 continues to rotate, and the stamping plate 12 continues to descend at a constant speed until an impact load is applied to the wood.

[0056] After the impact action of the stamping plate 12 on the wood is completed, the stepper motor 2 is activated, driving the active plate 4 and the connecting shaft 3 to reverse. Then, the first helical gear 11 and the second helical gear 102 mesh in the opposite direction, the second lead screw 10 reverses, the stamping plate 12 moves upward and resets. As the stamping plate 12 moves upward, the wedge block 120 moves upward and disengages from the inclined block 52. Under the action of the first spring 53, the limit frame 51 moves to the right and resets, the linkage driven plate 50 moves to the right and resets, the end face of the driven plate 50 and the active plate 4 are tightly pressed together again, the driven plate 50 is controlled to reverse, the rotating rod 5 reverses, under the action of the belt 7, the first lead screw 6 reverses, and then drives the simulation frame 8 to move laterally and reset. Then the stepper motor 2 is turned off, which facilitates the subsequent cyclic use of this device.

[0057] refer to Figure 1 Considering the lateral movement of the simulation frame 8 and the spraying of water mist onto the wood surface by the environmental simulator 9, the spraying of water mist will affect the operation of the surrounding components. To protect the components, a third outer shell 29 is detachably installed on the base 1 to protect the relevant components that enable the movement of the simulation frame 8 and the stamping plate 12. The third outer shell 29 has a guide groove (not shown in the figure), and the inclined block 52 slides in the guide groove. The purpose is to limit the movement of the inclined block 52 through the guide groove, that is, the inclined block 52 only has space to slide left and right.

[0058] refer to Figure 4 The test bench 15 is detachably equipped with two sets of first outer shells 170 and second outer shells 171. The first outer shells 170 and second outer shells 171 are connected by modular snap-fit ​​to form a box. The purpose is to protect the relevant components that enable the rotation of the pressing frame 25 through the snap-fit ​​connection of the first outer shells 170 and second outer shells 171.

[0059] This device utilizes the rotation of the rotating column 24, rotating plate 242, and fixed disk 240, along with the engagement of the sliding protrusion 243 with the sliding groove on the pressing frame 25, to rotate the pressing frame 25. This rotation of the pressing frame 25 compresses the wood, causing it to break and spring back quickly. The springing wood contacts the pressing frame 25 and pulls it upwards. Under the action of the fifth spring 241, the elastic force generated by the impact is buffered. Through the cooperation of the pressing frame 25 and the fifth spring 241, the device actively buffers the impact force of the wood breakage while simultaneously achieving the pressing effect, preventing the wood from violently springing back and causing damage to surrounding personnel and equipment. The device also utilizes stepper motors... Machine 2 has a single output. The cooperation of the second helical gear 102, the first helical gear 11, the connecting shaft 3, the trigger assembly, the rotating rod 5, and the belt 7 realizes the rotation of the second lead screw 10 and the first lead screw 6, thereby synchronizing the lifting and lowering action of the stamping plate 12 and the moving action of the simulation frame 8, realizing the simulation of a high humidity environment and the stamping effect of the stamping plate 12. By squeezing the wedge block 120 and the inclined block 52, the driven plate 50 moves and disengages from the end face of the driving plate 4, thereby realizing the stopping effect of the simulation frame 8, while the stamping plate 12 continues to descend. This achieves the effect of simulating a high humidity environment and the stamping action of the stamping plate 12 being independent of each other.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for testing the bending resistance of wood-plastic composite materials, comprising a base (1), wherein two mounting brackets (103) are fixedly connected to the base (1), characterized in that: A press plate (12) with controlled lifting is provided between the two mounting brackets (103), a test platform (15) with controlled movement is provided on the base (1), two receiving frames (19) with controlled movement are provided on the test platform (15), and two pressing frames (25) with controlled rotation are provided on the test platform (15).

2. The device for testing the bending resistance of wood-plastic composite materials according to claim 1, characterized in that: The test bench (15) is provided with two lifting frames (18), each lifting frame (18) is provided with a receiving frame (19), and each lifting frame (18) is provided with two symmetrically distributed connecting brackets (27). Each connecting bracket (27) is provided with a rotating shaft (271), and each rotating shaft (271) passes through the connecting bracket (27). Each rotating shaft (271) is provided with a first turntable (272), and each first turntable (272) is provided with a connecting rod (26). Each connecting rod (26) is provided with a second turntable (273). Each lifting frame (18) is provided with a rotating column (24), and each rotating column (24) is provided with a controlled rotating pressing frame (25). The rotating column (24) is fixedly connected to the second turntable (273). Each rotating shaft (271) is provided with a threaded column (23), and each threaded column (23) is provided with a pressing frame (21). The pressing frame (21) cooperates with the threaded column (23).

3. The device for testing the bending resistance of wood-plastic composite materials according to claim 2, characterized in that: A third spring (20) is provided between the receiving frame (19) and the lifting frame (18). Two symmetrically distributed telescopic members (274) are provided on the connecting bracket (27). The extension end of the telescopic member (274) is fixedly connected to the extrusion frame (21). A fourth spring (22) is provided between the connecting bracket (27) and the extrusion frame (21).

4. The device for testing the bending resistance of wood-plastic composite materials according to claim 3, characterized in that: The extrusion frame (21) is provided with a protrusion and a slope. The connecting bracket (27) is provided with a pin (281) and a slope. A seventh spring (28) is provided between the pin (281) and the connecting bracket (27). The slope of the pin (281) and the slope of the protrusion on the extrusion frame (21) are pressed together.

5. The device for testing the bending resistance of wood-plastic composite materials according to claim 2, characterized in that: The rotating column (24) is provided with a rotating plate (242), and a fixed plate (240) is keyed to the rotating column (24). The fixed plate (240) is provided with two symmetrically distributed sliding protrusions (243). The fixed plate (240) is provided with a pressing frame (25). The pressing frame (25) is provided with two symmetrically distributed sliding grooves. The sliding protrusions (243) slide in the sliding grooves of the pressing frame (25). The pressing frame (25) is in contact with the rotating plate (242). A fifth spring (241) is provided between the pressing frame (25) and the fixed plate (240). The pressing frame (25) and the fixed plate (240) form a sliding fit system. The pressing frame (25) is provided with a U-shaped bayonet. The bayonet fits with the rotating column (24). A sliding limit block (250) is provided on the bayonet. A sixth spring (251) is provided between the sliding limit block (250) and the bayonet.

6. The device for testing the bending resistance of wood-plastic composite materials according to claim 1, characterized in that: The base (1) is provided with two controllable movable adjustment frames (17), each of which is connected to a lifting frame (18) by fasteners. The test platform (15) is provided with a bidirectional lead screw (16), one end of each of the two adjustment frames (17) is threaded to the bidirectional lead screw (16), and the other end of each of the two adjustment frames (17) is slidably connected to the test platform (15). The base (1) is provided with an electric push rod, and a support platform (110) is keyed to the electric push rod. A fixed box (13) is provided on the support platform (110), and a third lead screw (14) is provided on the fixed box (13). A servo motor (141) is keyed to the third lead screw (14), and the test platform (15) is threadedly connected to the third lead screw (14).

7. The device for testing the bending resistance of wood-plastic composite materials according to claim 1, characterized in that: The mounting bracket (103) is provided with a second lead screw (10), and the stamping plate (12) is threadedly connected to the second lead screw (10). The base (1) is provided with a controllable movable simulation frame (8), and an environmental simulator (9) is installed on the simulation frame (8). The base (1) is provided with two brackets (101), and the brackets (101) are fixedly connected to the mounting bracket (103). The brackets (101) are provided with a first lead screw (6), and one end of the first lead screw (6) is connected to the simulation frame (8). The bracket (101) is threaded and a stepper motor (2) is mounted on it. The output end of the stepper motor (2) is keyed to a connecting shaft (3). A first helical gear (11) is provided on the connecting shaft (3). The connecting shaft (3) is connected to a rotating rod (5) through a trigger assembly. A belt (7) is provided between the rotating rod (5) and the first lead screw (6). A second helical gear (102) is keyed to the second lead screw (10). The second helical gear (102) cooperates with the first helical gear (11).

8. The device for testing the bending resistance of wood-plastic composite materials according to claim 7, characterized in that: The triggering assembly includes an active disk (4) fixed to the connecting shaft (3), a passive disk (50) on the rotating rod (5), the end faces of the active disk (4) and the passive disk (50) are both friction surfaces, a limiting disk (54) on the rotating rod (5), and a first spring (53) between the limiting disk (54) and the passive disk (50).

9. The device for testing the bending resistance of wood-plastic composite materials according to claim 8, characterized in that: The driven plate (50) is provided with a limiting frame (51), the limiting frame (51) is provided with an inclined block (52), the stamping plate (12) is provided with a support arm (122), the support arm (122) is provided with a wedge block (120), a second spring (121) is provided between the wedge block (120) and the support arm (122), and the wedge block (120) and the inclined block (52) are pressed together.

10. The device for testing the bending resistance of wood-plastic composite materials according to claim 1, characterized in that: The base (1) is detachably mounted with a third outer shell (29), the third outer shell (29) has a guide groove, and the inclined block (52) slides in the guide groove. The test platform (15) is detachably mounted with two sets of first outer shells (170) and second outer shells (171), and the first outer shells (170) and second outer shells (171) are connected by modular snap-fit ​​to form a box.

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