Push door resistance testing device with water circulation and automatic water storage function

Abstract

The application relates to the technical field of mechanical testing, in particular to a push door resistance testing device with a water circulation automatic water storage function, which comprises a main water tank, a door frame, a door leaf, a water collecting saucer, a liquid storage cavity, a flow distribution disc, a resistance measuring unit, a first pump, a second pump and a control unit. A water inlet of the first pump is in communication with a clean water side of a first chamber filter screen, and water outlets are respectively connected to the liquid storage cavity and a clean water side of a second chamber filter screen; the second pump is reversely and crossly connected. According to opening and closing actions of the door leaf, the control unit controls two chambers to alternately execute filtering and backwashing, and corresponding pump bodies are started. The flow distribution disc is in transmission connection with a door shaft, and the water replenishment flow increases with the increase of the door opening angle. The application realizes automatic circulation of double-chamber alternating filtering and backwashing, the filter screen is cleaned in each test cycle, and manual maintenance is reduced; self-adaptive constant-pressure water replenishment is realized, real flood push door feeling is reproduced, and the cleaning capacity of a Venturi tube section on a backwashing branch pipe is enhanced by using cavitation effect.

Description

Technical Field

[0001] This application relates to the technical field of mechanical testing, and in particular to a door resistance testing device with automatic water circulation and storage function. Background Technology

[0002] When cities experience torrential rains, underground structures such as basements, garages, ground-floor shops, and air-raid shelters are highly susceptible to flooding. The external flood pressure acts on doors, requiring people to overcome immense water pressure to push them open for escape. To train escape skills or test door pressure resistance, a device is needed that can realistically simulate the resistance to pushing doors at different water depths. Existing technology has proposed using a real water tank to apply water pressure, adjusting the water level to subject the door to varying hydrostatic pressures, and recording the pushing force using a force-measuring mechanism.

[0003] A search revealed Chinese patent application CN202511424226.9, which discloses a device for testing door resistance during simulated urban flooding. The device includes a horizontally placed operating platform with a water storage tank. A door for testing personnel to push open is installed on the platform. The water storage tank is located inside the door, and a platform for the testing personnel to stand on is located outside the door. An outlet is provided on the platform to recirculate water from the water storage tank back into a water tank for future testing. This technology provides a water storage tank that improves the accuracy of water storage capacity. It effectively simulates different water levels creating varying resistance to the door, allowing for effective testing of the door-pushing ability of escapees, thereby reducing test error and improving accuracy.

[0004] Regarding the aforementioned technologies, the inventors discovered the following drawbacks: In real flood disasters, external water accumulation originates from large-scale inundation, and the total water volume can be considered a semi-infinite water body relative to the water volume drained by the door. The external water level hardly changes at the moment the door is opened, and the escapee is constantly facing continuous and undiminished hydrostatic pressure. Existing simulation devices are limited by site constraints and have a limited water tank volume. The total water storage capacity is on the same order of magnitude as the leakage volume during a single door opening. A large amount of water leaks out at the moment the door is opened without immediate compensation, making it impossible to reproduce the semi-infinite water body of a real situation in a small-volume water tank. Summary of the Invention

[0005] The technical problem this invention aims to solve is that during the opening of the door, as the door gaps open, the water in the tank continuously leaks outwards, making it impossible to reproduce the constant water pressure feel of a semi-infinite water area in a real flood in a small-volume tank.

[0006] To solve the above-mentioned technical problems, this application provides a door resistance testing device with automatic water circulation and storage function, which adopts the following technical solution: including: The main water tank is used to hold water; The door frame is fixed to one side of the main water tank; The door leaf is pivotally mounted on the door frame via a door hinge, and at least a portion of the door leaf bears the water pressure in the main water tank when closed; A reset mechanism applies a reset force to the door to make it close. A water collection tray is located below the door leaf to collect water that leaks from the main water tank when the door leaf is opened. The water collection tray is divided into a first chamber and a second chamber. Each of the first chamber and the second chamber is equipped with a filter screen, a first water inlet and a drain outlet. The water inlet control mechanism is used to control the opening and closing of the first water inlets of the first chamber and the second chamber respectively. The sewage control mechanism is used to control the opening and closing of the sewage outlets of the first chamber and the second chamber respectively; The liquid storage chamber is connected to the main water tank; The distribution plate is connected to the door hinge drive of the door leaf and is used to control the water supply flow from the liquid storage chamber to the main water tank, so that the larger the door leaf opening angle, the larger the water supply flow. The first pump has an inlet connected to the filter screen of the first chamber for purified water, and its outlet is connected to the filter screen of the second chamber for purified water, respectively. The second pump has an inlet connected to the filter screen of the second chamber for purified water, and its outlet is connected to the filter screen of both the storage chamber and the first chamber for purified water. Sensors are used to detect the opening or closing of the door. The control unit is electrically connected to the sensor, the first pump, the second pump, the inlet control mechanism, and the drain control mechanism, and is configured to: when the door is detected to be open, put the first chamber into the filtration state, the second chamber into the backwash state, and start the first pump; when the door is detected to be closed, put the first chamber into the backwash state, the second chamber into the filtration state, and start the second pump. The resistance measurement unit, installed on the door leaf, is used to measure and lock the maximum force value that occurs during the door opening process.

[0007] By adopting the above technical solution, when the door is opened, the first chamber collects leaked water, and the first pump pumps the water from the first chamber to the storage chamber, while simultaneously backwashing the filter screen in the second chamber. Dirty water is discharged from the drain outlet in the second chamber. When the door is closed, the second chamber collects residual water, and the second pump pumps the water from the second chamber to the storage chamber, while simultaneously backwashing the filter screen in the first chamber. Dirty water is discharged from the drain outlet in the first chamber. The two chambers work alternately, ensuring the filter screen is cleaned with each cycle. The distribution plate is linked to the door leaf, and the water replenishment flow rate is positively correlated with the door opening angle, achieving adaptive water replenishment.

[0008] Optionally, the distribution plate includes a stationary plate and a moving plate. The moving plate is connected to the door hinge of the door leaf through a right-angle transmission mechanism. The stationary plate is fixed on the water supply passage between the liquid storage chamber and the main water tank. The moving plate has flow holes, and the flow area of ​​the flow holes increases as the door leaf opening angle increases.

[0009] Optionally, the right-angle transmission mechanism is a pair of meshing bevel gears, and the flow passage on the distribution plate is a V-shaped groove or arc-shaped hole with a gradually changing width along the circumferential direction.

[0010] Optionally, the water inlet control mechanism includes a grid plate slidably installed at the first water inlet of each chamber and a grid drive mechanism for driving the grid plate to slide; the sewage discharge control mechanism includes a baffle hinged at the sewage outlet of each chamber, a driven gear fixed on the rotating shaft of the baffle, and a first hydraulic rod and a second hydraulic rod respectively corresponding to the first chamber and the second chamber. The output ends of the first hydraulic rod and the second hydraulic rod are provided with racks, and each rack meshes with the corresponding driven gear to drive the baffle to flip and open / close the sewage outlet.

[0011] Optionally, the outlet of the first pump is connected to the filter screen of the second chamber through the first backwash branch pipe and is connected to the storage chamber through the first return water pipe; the outlet of the second pump is connected to the filter screen of the first chamber through the second backwash branch pipe and is connected to the storage chamber through the second return water pipe.

[0012] Optionally, both the first and second backwash branches are equipped with Venturi tube sections. The throat of the Venturi tube section is connected to the atmosphere through a one-way air intake valve. During backwashing, air is drawn in to form a gas-liquid two-phase jet, which enhances the cleaning power by utilizing the cavitation effect.

[0013] Optionally, the bottom of the liquid storage chamber is connected to the bottom of the main water tank via a connecting pipe.

[0014] Optionally, the resistance measurement unit includes a helical cylindrical spring linked to the handle, a rack that converts spring deformation into displacement, and a peak holding slider that cooperates with the rack. The peak holding slider is provided with a one-way ratchet that meshes with the helical teeth of the rack, so that the peak holding slider can only slide in the direction of spring compression and self-lock in the reverse direction to achieve peak force latching.

[0015] Optionally, the reset mechanism is a cylindrical torsion spring, which is sleeved on the door hinge of the door leaf.

[0016] Optionally, the control unit is also configured to: stop the first and second pumps and restore each chamber to the filtration state after the sensor detects that the door is completely closed for a predetermined time.

[0017] In summary, this application includes the following beneficial technical effects: 1. This invention divides the water collection tray into a first chamber and a second chamber, and sets up a first pump and a second pump that are cross-connected. When the door is opened, the first pump draws water from the first chamber and backwashes the filter screen in the second chamber; when the door is closed, the second pump draws water from the second chamber and backwashes the filter screen in the first chamber. This achieves an automatic cycle of alternating filtration and backwashing in the two chambers. The filter screen is backwashed and cleaned once in each test cycle, which greatly reduces the frequency of manual disassembly and cleaning and ensures stable operation for continuous multi-person testing.

[0018] 2. By setting up a distribution plate connected to the door leaf shaft drive, the water supply flow from the liquid storage chamber to the main water tank increases as the door leaf opening angle increases, achieving an adaptive dynamic balance where the larger the door opening, the more water is supplied. Combined with the connection between the liquid storage chamber and the bottom of the main water tank, the constant water pressure feel of a real flood semi-infinite water area is reproduced in a small volume water tank.

[0019] 3. This invention connects the outlets of the first and second pumps to the clean water side of the filter screen in the other chamber via backwashing branch pipes, and installs a Venturi tube section and a one-way air intake valve on the backwashing branch pipes. By utilizing the high pressure of the pump outlet water to generate negative pressure at the throat of the Venturi tube section to draw in air and form a gas-liquid two-phase jet, the cavitation effect is enhanced to improve the cleanliness of the filter screen backwashing without the need for an external air source. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application; Figure 2 This is a schematic diagram of the water collection tray in an embodiment of this application; Figure 3 This is a schematic diagram of the water inlet control mechanism in the embodiments of this application; Figure 4 yes Figure 3 Enlarged structural diagram of section A in the middle; Figure 5 This is a schematic diagram of the internal structure of the water collection tray in an embodiment of this application; Figure 6 This is a schematic diagram of the right-angle transmission mechanism in the embodiments of this application; Figure 7 This is a schematic diagram of the moving disk structure in an embodiment of this application; Figure 8 This is a schematic diagram of the static disk structure in an embodiment of this application; Figure 9 This is a schematic diagram of the connection relationship of the pipelines in the embodiments of this application.

[0021] Reference numerals: 1. Main water tank; 2. Door frame; 3. Door leaf; 4. Water collection tray; 41. First chamber; 42. Second chamber; 43. Filter screen; 44. Drain outlet; 45. First water inlet; 5. Liquid storage chamber; 6. Distribution plate; 61. Flow hole; 7. Right-angle transmission mechanism; 91. First pump; 92. Second pump; 101. First backwash branch pipe; 102. Second backwash branch pipe; 103. First return water pipe; 104. Second return water pipe; 11. Grille; 12. Baffle; 13. Driven gear; 14a. First hydraulic rod; 14b. Second hydraulic rod; 15a. First rack; 15b. Second rack; 16. Sensor; 17. Venturi tube section; 18. One-way suction valve; 19. Anti-slip base platform. Detailed Implementation

[0022] The following is in conjunction with the appendix Figures 1-9 This application will be further described in detail below. The technical solutions in the embodiments of this application will be clearly described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0023] This application discloses a door resistance testing device with automatic water circulation and storage function. For example... Figure 1 As shown, the device includes an anti-slip base platform 19, which is a steel plate platform with leveling feet on its lower surface to ensure the overall horizontal stability of the device. The upper surface of the anti-slip base platform 19 is fixedly equipped with a main water tank 1, a door frame 2, and a liquid storage chamber 5.

[0024] The main water tank 1 is an open container with an anti-rust coating on its inner surface. The main water tank 1 is equipped with a door frame for installing the door leaf. The door frame 2 is a rectangular frame structure, composed of an upper crossbeam, a lower crossbeam, and left and right uprights welded or bolted together. The upper crossbeam of the door frame 2 has a central upper door hinge mounting hole, and the lower crossbeam has a central lower door hinge mounting through hole; the two holes are coaxial. The lower door hinge mounting through hole is a through hole, allowing the lower door hinge to extend downwards after passing through it. Cylindrical door hinges are fixed to the upper and lower ends of the left side of the door leaf 3. The upper door hinge is inserted into the upper door hinge mounting hole of the door frame 2, and the lower door hinge passes through the lower door hinge mounting through hole of the door frame 2 and extends downwards, allowing the door leaf 3 to rotate freely around the door hinge axis. A push-pull handle is located on the upper outer surface of the door leaf 3. The handle is a horizontally positioned cylindrical structure, with both ends fixed to the door leaf panel by brackets. A cylindrical torsion spring is fitted onto the lower door hinge of the door leaf 3 as a reset mechanism. One end of the cylindrical torsion spring extends in a straight section and engages in a fixing hole on the lower crossbeam of the door frame 2; the other end extends in a straight section and engages in a pin hole on the side of the lower door hinge. The cylindrical torsion spring is in a free or slightly pre-tensioned state when the door 3 is closed. When the door 3 is pushed open, the cylindrical torsion spring is twisted to generate a restoring torque, allowing the door 3 to close automatically after the operator releases their grip. The stiffness of the cylindrical torsion spring is calculated and selected to ensure that its restoring torque is more than 1.2 times the sum of the torque generated by the door's own weight and the pump's working resistance torque.

[0025] Please see Figure 1 In this invention, the liquid storage chamber 5 is a sealable cuboid box. The liquid storage chamber 5 is fixedly installed on the anti-slip base platform 19 by a metal bracket, and its installation position is higher than the main water tank 1, so that the bottom of the liquid storage chamber 5 is higher than the bottom of the main water tank 1. The top of the liquid storage chamber 5 is provided with two water inlet ports, which are used to connect to the first return water pipe 103 and the second return water pipe 104, respectively. The bottom of the liquid storage chamber 5 is provided with a water outlet port, which is connected to the bottom of the main water tank 1 through a connecting pipe. A distribution plate 6 is installed in series on this connecting pipe.

[0026] Please see Figure 6 , Figure 7 and Figure 8 In this invention, the distribution plate 6 is an end-face distribution structure, comprising a stationary plate and a moving plate. The stationary plate is a disc-shaped part, which is fixedly installed on the pipeline at the outlet of the liquid storage chamber 5 by bolts, and a circular water inlet is opened at the center of the end face of the stationary plate. The moving plate is a disc-shaped part that cooperates with the stationary plate, and has the same diameter as the stationary plate. The moving plate is connected to the door hinge of the door leaf 3 through a right-angle transmission mechanism 7.

[0027] Please see Figure 6In this invention, the right-angle transmission mechanism 7 consists of a pair of meshing bevel gears. The driving bevel gear is fixedly mounted on the lower door hinge of the door leaf 3, located below the lower crossbeam of the door frame 2. The driven bevel gear meshes with the driving bevel gear, and its axis intersects perpendicularly with the axis of the driving bevel gear. The driven bevel gear is fixedly mounted at the top of a vertical transmission shaft, the bottom end of which is connected to the movable disc of the distribution plate 6 via a key. When the door leaf 3 is opened, the lower door hinge drives the driving bevel gear to rotate, which in turn drives the driven bevel gear and the vertical transmission shaft to rotate, ultimately driving the movable disc of the distribution plate 6 to rotate. The transmission ratio of the bevel gears is 1:1, ensuring that the movable disc rotates synchronously with the door leaf 3 by the same angle.

[0028] A flow-through hole 61 is provided on the end face of the moving plate of the distribution plate 6. The flow-through hole 61 is a V-shaped groove with a gradually changing width along the circumference. During assembly, a positioning pin ensures that when the door 3 is in the fully closed position, the flow-through hole 61 on the moving plate is completely offset from the water inlet on the stationary plate in the circumferential direction, cutting off the water supply path and preventing water in the storage chamber 5 from flowing into the main water tank 1. When the door 3 is opened, the moving plate rotates with the door, and the flow-through hole 61 gradually coincides with the water inlet of the stationary plate. The larger the opening angle, the larger the overlapping area, and the water supply flow increases linearly. When the door 3 is fully opened to 90 degrees, the flow-through hole 61 completely coincides with the water inlet, and the water supply flow reaches its maximum. This achieves a precise positive correlation between the water supply flow and the door opening angle; the wider the door is opened, the more leakage occurs, and the more forceful the water supply.

[0029] Please see Figure 1 , Figure 2 and Figure 3 In this invention, the water collection tray 4 is installed on the side of the door leaf 3 facing away from the main water tank 1, and is embedded in a groove opened on the upper surface of the anti-slip base platform 19. The interior of the water collection tray 4 is divided into a first chamber 41 and a second chamber 42 arranged side by side by a vertical partition. The two chambers have identical structures and are symmetrically arranged. A filter screen 43 is installed at the lowest point of each chamber. The filter screen 43 is a rectangular flat filter screen, which is fixedly installed on the mounting frame of the bottom opening of the chamber by bolts. The filter screen 43 divides the inner cavity of each chamber into an upper dirt side and a lower clean water side. The dirt side is located at the top to collect leaked water, and the clean water side is located at the bottom to connect to the water suction pipe.

[0030] Each chamber has a first inlet 45 at its top, which is a rectangular opening through which leaked water enters the chamber. A grating plate 11 is slidably fitted at each first inlet 45. The grating plate 11 is a rectangular flat plate, slightly larger than the first inlet 45. The two sides of the grating plate 11 are embedded in grooves in the top of the chamber, allowing it to slide horizontally back and forth to open and close the first inlet 45. The grating plate 11 is controlled by an independent grating drive mechanism. The grating drive mechanism is a small electric push rod, fixedly installed on the outer wall of the water collection tray 4, with its output end connected to one end of the grating plate 11 via a connecting rod. When the electric push rod extends, it pushes the grating plate 11 to slide above the first inlet 45, completely covering and closing it; when the electric push rod retracts, it pulls the grating plate 11 to slide in the opposite direction, opening the first inlet 45.

[0031] Each chamber has a drain port 44 on its side wall. A baffle 12 is hinged to each drain port 44. The baffle 12 is slightly larger than the drain port 44. The baffle 12 is hinged to the edge of the drain port 44 by a horizontal rotating shaft. A driven gear 13 is fixedly installed on the rotating shaft. The driven gear 13 is a cylindrical spur gear.

[0032] The first chamber 41 is provided with a first hydraulic rod 14a. The first hydraulic rod 14a is an electro-hydraulic push rod, which is fixedly installed on the outer wall of the water collection tray 4. The output end of the first hydraulic rod 14a is fixedly connected to a first rack 15a. The first rack 15a is a straight rack with a module matching the driven gear 13. The first rack 15a meshes with the driven gear 13 of the first chamber 41. When the first hydraulic rod 14a extends, the first rack 15a moves forward, driving the driven gear 13 to rotate, and the baffle 12 flips around the rotation axis to open the drain port 44; when the first hydraulic rod 14a retracts, the first rack 15a moves backward, driving the driven gear 13 to rotate, and the baffle 12 flips to close the drain port 44.

[0033] The second chamber 42 is provided with a second hydraulic rod 14b, which has the same structure as the first hydraulic rod 14a. The output end of the second hydraulic rod 14b is fixedly connected to a second rack 15b, which meshes with the driven gear 13 of the second chamber 42 to drive the baffle 12 of the second chamber 42 to flip and open or close the corresponding drain port 44.

[0034] Please see Figure 9In this invention, both the first pump 91 and the second pump 92 are electric booster pumps, which are fixedly mounted on the anti-slip base platform 19 by brackets. The inlet of the first pump 91 is connected to the filter screen of the first chamber 41 via a suction pipe. One end of the suction pipe is connected to the outlet port on the side wall of the filter screen of the first chamber 41, and the other end is connected to the inlet of the first pump 91. The outlet of the first pump 91 is connected to a T-connector, which divides the water flow into two paths. The first path is connected to the first backwash branch pipe 101, the end of which extends into the filter screen of the second chamber 42 and is fitted with a flat, fan-shaped backwash nozzle facing the back of the filter screen 43 of the second chamber 42. The second path is connected to the first return water pipe 103, the end of which is connected to an inlet port at the top of the storage chamber 5.

[0035] The inlet of the second pump 92 is connected to the filter screen of the second chamber 42 via another suction pipe. The outlet of the second pump 92 is also connected to a T-connector. The first path connects to the second backwash branch pipe 102, whose end extends into the filter screen of the first chamber 41, with the nozzle facing the back of the filter screen 43 in the first chamber 41. The second path connects to the second return water pipe 104, whose end connects to another inlet pipe interface at the top of the storage chamber 5.

[0036] A Venturi tube section 17 is connected in series on both the first backwash branch pipe 101 and the second backwash branch pipe 102. The Venturi tube section 17 is a variable cross-section section, and its internal flow channels are, in sequence, a contraction section, a throat, and a diffuser section. The inner diameter of the contraction section gradually decreases, reaching its minimum at the throat, and the inner diameter of the diffuser section gradually increases. An air intake hole is provided on the side wall of the throat, and the air intake hole is connected to a one-way air intake valve 18 via a threaded interface. The one-way air intake valve 18 is a spring-return miniature one-way valve, with its inlet connected to the atmosphere and its outlet connected to the air intake hole in the throat. When negative pressure is generated in the throat, the valve core opens under the action of the pressure difference, and air is drawn in and mixed with the water flow to form a two-phase gas-liquid jet; when there is no negative pressure or positive pressure in the throat, the valve core closes under the action of the spring to prevent water from leaking from the air intake hole. Throttle valves are provided on both the first return water pipe 103 and the second return water pipe 104 to regulate the return water flow rate to balance the flow distribution between the backwash branch pipe and the return water pipe.

[0037] Please see Figure 6In this invention, a sensor 16 is fixedly installed on the lower crossbeam of the door frame 2. The sensor 16 is an angle sensor, with its detection axis coaxially connected to the lower door hinge of the door leaf 3. It is used to detect the rotation angle of the door leaf 3 relative to the door frame 2 in real time, thereby determining the opening or closing action of the door leaf 3 and its current opening degree. The control unit is a PLC programmable logic controller, installed in a waterproof control box on the anti-slip base platform 19. The input terminal of the control unit is connected to the sensor 16 via a signal line to receive the door leaf angle signal. The output terminal of the control unit is electrically connected via a drive circuit to the motors of the first pump 91, the second pump 92, the drive motors of the first hydraulic rod 14a and the second hydraulic rod 14b, and the grid drive mechanism of the two grid plates 11, respectively, to control the actions of each actuator.

[0038] The control logic preset inside the control unit is as follows: when sensor 16 detects that door leaf 3 starts to open from the closed position, it is determined to be a door pushing action, and the door pushing program is executed immediately; when sensor 16 detects that door leaf 3 starts to close from the open position and continues to close, it is determined to be a door closing action, and the door closing program is executed immediately; when sensor 16 detects that door leaf 3 is completely closed and remains closed for more than 3 seconds, the standby program is executed.

[0039] In this invention, the resistance measuring unit is integrally mounted on one side panel of the door leaf 3. The resistance measuring unit includes a force measuring housing, which is fixedly mounted on the inner side panel of the door leaf 3 with screws. A transparent scale window is provided on the front wall of the housing. The handle of the door leaf 3 extends into the housing through the door leaf panel via a mandrel. An annular shoulder is machined at the end of the mandrel, and a helical cylindrical spring is sleeved on the mandrel. One end of the helical cylindrical spring abuts against the shoulder at the end of the mandrel, and the other end abuts against a spring mounting seat on the inner wall of the housing. When the operator pulls the handle, the mandrel moves inward into the housing, compressing the helical cylindrical spring. The amount of spring compression is proportional to the applied pulling force.

[0040] A rack, extending horizontally in a straight line, is fixedly connected to the center of the spindle via screws. A peak holding slider is slidably mounted in a guide groove on the inner wall of the housing. The lower surface of the peak holding slider is machined with one-way ratchet teeth, the tooth profile of which matches the helical teeth of the rack. The one-way ratchet teeth mesh with the helical teeth of the rack, allowing the peak holding slider to slide only in the direction of spring compression. In the reverse direction, the ratchet teeth engage with the helical teeth of the rack to form a self-locking mechanism, keeping the peak holding slider at its maximum displacement position. A pointer, a slender needle-like component, is fixedly connected to the top of the peak holding slider via screws, its tip pointing to a scale window on the surface of the housing. The scale window has printed force markings.

[0041] When the operator pushes the handle, the spindle moves the rack into the housing, pushing the peak holding slider along the guide rail. The pointer then moves across the scale window, displaying the applied force in real time. When the operator releases the force or reduces the force, the helical cylindrical spring pushes the spindle and rack back, but the peak holding slider remains at its maximum displacement position due to the one-way ratchet self-locking mechanism. The pointer then displays the maximum force value experienced during the push. After the test, the operator can manually move the reset lever on the side of the peak holding slider to return it to zero.

[0042] The working principle and testing process of this application embodiment are as follows: During the initial preparation phase, the storage chamber 5 is pre-filled with water. Since the flow holes 61 of the distribution plate 6 and the water inlet of the stationary plate are completely misaligned when the door 3 is closed, the water supply path is cut off. All grid plates 11 are in the open state, and all baffles 12 are in the closed drain port 44 state. Both the first pump 91 and the second pump 92 are in the stopped state. The pointer of the resistance measuring unit is returned to zero.

[0043] When the operator pushes the handle of door leaf 3 to perform a door-opening test, door leaf 3 rotates around the door hinge to open, and the lower door hinge rotates synchronously. Sensor 16 detects that the opening angle of door leaf 3 exceeds 5 degrees and sends a signal to the control unit. The control unit immediately executes the door-opening procedure: it controls the grille drive mechanism of the first chamber 41 to keep the grille plate 11 in the open state, and the grille drive mechanism of the second chamber 42 pushes the grille plate 11 to close the first water inlet 45; at the same time, it controls the first hydraulic rod 14a of the first chamber 41 to keep it in the retracted state so that the baffle 12 closes the drain outlet 44, and the second hydraulic rod 14b of the second chamber 42 extends so that the baffle 12 opens the drain outlet 44; at the same time, it starts the first pump 91.

[0044] During the door opening process, water leaking from the door gap falls into the water collection tray 4. Since the first water inlet 45 of the second chamber 42 is closed by the grille plate 11, the leaked water can only enter the first chamber 41. After being filtered by the filter screen 43 of the first chamber 41, the clean water enters the clean water side of the first chamber 41. The first pump 91 draws water from the clean water side of the first chamber 41, and the pumped high-pressure water is divided into two paths: one path sends the clean water back to the storage chamber 5 through the first return water pipe 103 to complete the water circulation and recovery; the other path goes through the first backwash branch pipe 101 and the Venturi pipe section 17, draws in air at the throat to form a gas-liquid two-phase jet, and sprays it at high speed from the backwash nozzle towards the back of the filter screen 43 of the second chamber 42 for backwashing. The microbubbles collapse on the surface of the filter screen 43 of the second chamber 42 and on the dirt particles, generating a cavitation stripping effect, which powerfully strips away the mud and debris trapped on the dirt side of the filter screen. The flushed-off waste, along with the backwash water, is discharged from the drain outlet 44 of the second chamber 42 and falls into the wastewater collection container that is placed below the drain outlet.

[0045] Meanwhile, the lower door hinge drives the rotating disc of the distribution plate 6 to rotate via the right-angle transmission mechanism 7. The flow hole 61 gradually overlaps with the water inlet of the stationary disc, and the water in the storage chamber 5 is replenished into the main water tank 1 through the distribution plate 6 under the action of gravity. The larger the opening angle of the door leaf 3, the larger the overlapping area of ​​the flow holes, and the greater the water replenishment flow, accurately compensating for the increased leakage caused by the increased door gap. The liquid level in the main water tank 1 remains basically constant throughout the entire door opening process, and the water pressure is stable.

[0046] The resistance measurement unit records the thrust applied by the operator in real time. The helical cylindrical spring is compressed, the rack pushes the peak to keep the slider sliding, and the pointer displays the current thrust value in real time.

[0047] When the operator exhausts their strength or releases their grip after pushing the door open, the reset torque of the cylindrical torsion spring drives the door 3 to close automatically. Sensor 16 detects that the door 3 is starting to close and sends a signal to the control unit. The control unit immediately executes the closing procedure: stops the first pump 91, controls the grille drive mechanism of the first chamber 41 to push the grille plate 11 to close the first water inlet 45, and controls the grille drive mechanism of the second chamber 42 to pull the grille plate 11 to open the first water inlet 45; simultaneously controls the first hydraulic rod 14a of the first chamber 41 to extend, causing the baffle 12 to open the drain outlet 44, and controls the second hydraulic rod 14b of the second chamber 42 to retract, causing the baffle 12 to close the drain outlet 44; and simultaneously starts the second pump 92.

[0048] During the closing process, residual water and any possible trace leakage water fall into the water collection tray 4 and can only enter the second chamber 42. The second pump 92 draws water from the clean water side of the second chamber 42. The high-pressure water pumped out is sent back to the storage chamber 5 via the second return water pipeline 104, and the other path forms a gas-liquid two-phase jet through the second backwash branch pipe 102 and the Venturi tube section 17 to backwash the filter screen 43 of the first chamber 41. The dirty water is discharged from the drain port 44 opened in the first chamber 41.

[0049] As the door 3 closes, the water supply flow of the distribution plate 6 gradually decreases. When the door 3 is completely closed, the flow hole 61 and the water inlet of the stationary plate are completely separated again, and the water supply path is cut off.

[0050] When sensor 16 detects that door 3 is completely closed for 3 seconds, the control unit executes the standby program: stops the second pump 92, controls the first hydraulic rod 14a to retract so that the baffle 12 of the first chamber 41 closes the drain port 44, the second hydraulic rod 14b remains in the retracted state so that the baffle 12 of the second chamber 42 closes the drain port 44, and controls the two grid drive mechanisms to pull the grid plates 11 to open the first water inlets 45 of the two chambers. All components return to the initial ready state, and one complete test cycle ends.

[0051] The peak holding slider of the resistance measurement unit, due to its one-way ratchet self-locking mechanism, has locked the maximum pushing force of this test onto the scale window, which can be directly read by the tester without the need for assistance from a second person. Manually moving the reset lever will return the peak holding slider to zero, preparing for the next test.

[0052] In continuous multi-person testing, the aforementioned door opening and closing processes were repeatedly alternated. The first chamber 41 and the second chamber 42 alternately performed the filtration and backwashing functions. The filter screen 43 was backwashed and cleaned once in each test cycle, preventing clogging due to long-term use. The distribution plate 6 precisely adjusted the water supply flow according to the opening angle each time the door was opened. Combined with the water storage in the liquid storage chamber 5 and the water supply through the bottom connecting pipe, the liquid level in the main water tank 1 remained stable.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A door resistance testing device with automatic water circulation and storage function, characterized in that, include: Main water tank (1), used to hold water; The door frame (2) is fixed to one side of the main water tank (1); The door leaf (3) is pivotally mounted on the door frame (2) via a door hinge, and at least a portion of the door leaf (3) bears the water pressure in the main water tank (1) when closed; A reset mechanism applies a reset force to the door leaf (3) to make it tend to close; A water collection tray (4) is arranged below the door leaf (3) to collect water leaking from the main water tank (1) when the door leaf (3) is opened. The water collection tray (4) is divided into a first chamber (41) and a second chamber (42). Each of the first chamber (41) and the second chamber (42) is provided with a filter screen (43), a first water inlet (45) and a drain outlet (44). The water inlet control mechanism is used to control the opening and closing of the first water inlet (45) of the first chamber (41) and the second chamber (42) respectively; The sewage control mechanism is used to control the opening and closing of the sewage outlets (44) of the first chamber (41) and the second chamber (42) respectively; The liquid storage chamber (5) is connected to the main water tank (1); The distribution plate (6) is connected to the door hinge of the door leaf (3) and is used to control the water supply flow from the liquid storage chamber (5) to the main water tank (1), so that the larger the opening angle of the door leaf (3) is, the larger the water supply flow is. The first pump (91) and the second pump (92) are connected. The inlet of the first pump (91) is connected to the filter screen of the first chamber (41) and the outlet is connected to the filter screen of the storage chamber (5) and the second chamber (42) respectively. The inlet of the second pump (92) is connected to the filter screen of the second chamber (42) and the outlet is connected to the filter screen of the storage chamber (5) and the first chamber (41) respectively. Sensor (16) is used to detect the opening or closing action of the door (3); The control unit, electrically connected to the sensor (16), the first pump (91), the second pump (92), the water inlet control mechanism, and the sewage discharge control mechanism, is configured to: when the door (3) is detected to be open, put the first chamber (41) in a filtering state and the second chamber (42) in a backwashing state, and start the first pump (91); when the door (3) is detected to be closed, put the first chamber (41) in a backwashing state and the second chamber (42) in a filtering state, and start the second pump (92). A resistance measurement unit is installed on the door leaf (3) to measure and lock the maximum force value that occurs during the door pushing process.

2. The door resistance testing device with automatic water circulation and storage function according to claim 1, characterized in that: The distribution plate (6) includes a stationary plate and a moving plate. The moving plate is connected to the door hinge of the door leaf (3) through a right-angle transmission mechanism (7). The stationary plate is fixed on the water supply passage between the liquid storage chamber (5) and the main water tank (1). The moving plate has a flow hole (61). The flow area of ​​the flow hole (61) increases as the opening angle of the door leaf (3) increases.

3. The door resistance testing device with automatic water circulation and storage function according to claim 2, characterized in that: The right-angle transmission mechanism (7) is a pair of meshing bevel gears, and the flow holes on the moving plate of the distribution plate (6) are V-shaped grooves or arc-shaped holes with gradually changing width along the circumferential direction.

4. The door resistance testing device with automatic water circulation and storage function according to claim 1, characterized in that: The water inlet control mechanism includes a grid plate (11) slidably installed at the first water inlet (45) of each chamber and a grid drive mechanism for driving the grid plate (11) to slide; the sewage discharge control mechanism includes a baffle (12) hinged at the sewage outlet (44) of each chamber, a driven gear (13) fixed on the rotating shaft of the baffle (12), and a first hydraulic rod (14a) and a second hydraulic rod (14b) respectively corresponding to the first chamber (41) and the second chamber (42). The output ends of the first hydraulic rod (14a) and the second hydraulic rod (14b) are provided with racks. Each rack meshes with the corresponding driven gear (13) to drive the baffle (12) to flip and open / close the sewage outlet (44).

5. A door resistance testing device with automatic water circulation and storage function according to claim 1, characterized in that: The outlet of the first pump (91) is connected to the filter screen of the second chamber (42) through the first backwash branch pipe (101) and is connected to the storage chamber (5) through the first return water pipe (103); the outlet of the second pump (92) is connected to the filter screen of the first chamber (41) through the second backwash branch pipe (102) and is connected to the storage chamber (5) through the second return water pipe (104).

6. A door resistance testing device with automatic water circulation and storage function according to claim 5, characterized in that: Both the first backwash branch pipe (101) and the second backwash branch pipe (102) are provided with a Venturi section (17), and the throat of the Venturi section (17) is connected to the atmosphere through a one-way intake valve (18).

7. A door resistance testing device with automatic water circulation and storage function according to claim 1, characterized in that: The bottom of the liquid storage chamber (5) is connected to the bottom of the main water tank (1) through a connecting pipe.

8. The door resistance testing device with automatic water circulation and storage function according to claim 1, characterized in that: The resistance measurement unit includes a helical cylindrical spring that is linked to the handle of the door leaf (3), a rack that converts the deformation of the helical cylindrical spring into displacement, and a peak holding slider that cooperates with the rack. The peak holding slider is provided with a one-way ratchet that meshes with the helical teeth of the rack, so that the peak holding slider can only slide in the spring compression direction and self-lock in the reverse direction.

9. The door resistance testing device with automatic water circulation and storage function according to claim 1, characterized in that: The reset mechanism is a cylindrical torsion spring, which is sleeved on the door hinge of the door leaf (3).

10. The door resistance testing device with automatic water circulation and storage function according to claim 1, characterized in that: The control unit is also configured to stop the first pump (91) and the second pump (92) and restore each chamber to the filtration state after the sensor (16) detects that the door (3) is completely closed for a predetermined time.

Images