A special testing device for the firmness and flexibility of police helmets

Abstract

The present invention discloses a special testing device for the firmness and flexibility of police helmets, which includes a main body support frame, an up-and-down motion device, a rotary motion device, a test head mold, a swinging motion device, a laser ranging device, and a control box; the up-and-down motion device, the rotary motion device, the test head mold, the swinging motion device, the laser ranging device, and the control box are all arranged on the main body support frame; the up-and-down motion device, the rotary motion device, the test head mold, the swinging motion device, and the laser ranging device are all communicatively connected to the control box, the test head mold is used for installing the helmet to be tested, the up-and-down motion device, the rotary motion device, and the swinging motion device are respectively used for driving the test head mold to move up and down, rotate left and right, and swing; the laser ranging device is used for measuring the distance from the test head mold. Using the present invention can minimize the influence of subjective evaluation on the test results, and at the same time improve the test efficiency and the reproducibility of the test results.

Description

Technical Field

[0001] The present invention relates to the technical field of police equipment testing, and particularly to a special testing device for the firmness and flexibility of police helmets. Background Art

[0002] Currently, there are no requirements for testing the firmness and flexibility of helmets in the police equipment industry standards in our country. The existing test methods rely entirely on subjective evaluation after static wearing, without considering factors such as jolting up and down and swaying left and right according to actual combat situations, which has a great impact on the police officers' law enforcement and office work.

[0003] The existing tests for the firmness and flexibility of police helmets are mainly completed manually. Various states such as head pitching, left and right swaying, left and right rotation, running jolting, and advancing jolting are specified. The number of movements, time, the road surface, and the runway for advancing are designed manually. The entire test process requires a large number of personnel, is cumbersome, and has a long test time, and requires a lot of manpower and material resources. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention aims to provide a special testing device for the firmness and flexibility of police helmets.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A special testing device for the firmness and flexibility of police helmets, comprising a main body support frame, an up-and-down movement device, a rotational movement device, a test head mold, a swinging movement device, a laser ranging device, and a control box; the up-and-down movement device, the rotational movement device, the test head mold, the swinging movement device, the laser ranging device, and the control box are all arranged on the main body support frame; the up-and-down movement device, the rotational movement device, the test head mold, the swinging movement device, and the laser ranging device are all communicatively connected to the control box. The test head mold is used for installing the helmet to be tested. The up-and-down movement device, the rotational movement device, and the swinging movement device are respectively used to drive the test head mold to move up and down, rotate left and right, and swing; the laser ranging device is used to measure the distance from the test head mold.

[0007] Further, the main body support frame is mainly composed of high-strength aluminum profiles.

[0008] Further, the up-and-down movement device is composed of an optoelectronic encoder, a high-lead screw, a moving crossbeam, follower synchronous pulleys, driving synchronous pulleys, a synchronous belt, an up-and-down servo motor, and a reducer; the up-and-down servo motor and the reducer are drivingly connected to the driving synchronous pulley, and the driving synchronous pulley is drivingly connected to at least two follower synchronous pulleys through the synchronous belt; each follower synchronous pulley is respectively connected to a high-lead screw, and the moving crossbeam is connected to the high-lead screws through screw nuts; the optoelectronic encoder is installed on the high-lead screw; the rotary motion device, the test head mold, and the swinging motion device are all installed on the moving crossbeam.

[0009] Further, the rotary motion device is composed of a rotary shaft coupling seat, a rotary servo motor, and a reducer; the rotary servo motor and the reducer are drivingly connected to the rotary shaft coupling seat, and can drive the rotary shaft coupling seat to rotate left and right; the test head mold is connected to the rotary shaft coupling seat, and the rotary shaft coupling seat can drive the test head mold to rotate left and right.

[0010] Furthermore, the rotary motion device further includes a zero-degree positioning sensor and a 90-degree positioning sensor, and the included angle between the zero-degree positioning sensor and the 90-degree positioning sensor is 90 degrees, which are respectively used to sense the positions of the test head mold at 0° and 90°.

[0011] Further, the test head mold is composed of a half head mold, a head mold support seat, a force sensor, and a simulated mandible. The half head mold is connected to the upper end of the head mold support seat, and the lower end of the head mold support seat is connected to the rotary motion device; the shape of the half head mold simulates the part of the human head wearing a helmet, the simulated mandible is arranged on one side of the head mold support seat, and the force sensor is arranged on the top of the simulated mandible to sense the force on the simulated mandible.

[0012] Furthermore, the half head mold is a cast aluminum component, and its surface is covered with thin silica gel.

[0013] Furthermore, an acceleration sensor is arranged on the head mold support seat, and the acceleration sensor is used to measure the rotation angle and the swing angle of the half head mold.

[0014] Furthermore, the swinging motion device is composed of a front swinging rotary shaft, a main swinging support seat, a swinging servo motor and a reducer, a swinging shaft coupling seat, a rear swinging rotary shaft, and a support frame; the rotary motion device is connected to the main swinging support seat, both ends of the main swinging support seat are respectively connected to the front swinging rotary shaft and the rear swinging rotary shaft, and the front swinging rotary shaft and the rear swinging rotary shaft are respectively rotatably connected to the support frame through the swinging shaft coupling seat; the swinging servo motor and the reducer are drivingly connected to the rear swinging rotary shaft; the support frame is connected to the up-and-down movement device.

[0015] Further, the laser ranging device is composed of a laser sensor, an upper bracket of the sensor, an adjustment knob, and a lower bracket of the sensor; the lower bracket of the sensor is installed on one side of the test head mold, the upper bracket of the sensor and the lower bracket of the sensor are rotatably connected, and the laser sensor is rotatably connected to the upper bracket of the sensor through the adjustment knob. The laser sensor is used to measure the distance between the test head mold and the helmet to be tested.

[0016] The beneficial effects of the present invention are as follows: The automatic test of the police helmet can be realized by using the present invention, and the test result data can be automatically recorded, which can minimize the influence of subjective evaluation on the test results, improve the test efficiency and the reproducibility of the test results at the same time. The present invention can perform flexibility tests and evaluations on different motion states such as up and down bumping, pitching and swinging, left and right rotation, and left and right shaking. The present invention tests the clamping force between the head mold and the helmet strap during the movement, as well as the displacement and angle during the movement through the force sensor, the laser sensor, and the acceleration sensor. It is convenient to use, flexible to operate, and does not depend on manual adjustment. Therefore, the whole test process is highly stable and reliable. Description of the Drawings

[0017] Figure 1 It is the overall schematic diagram of the device in Embodiment 1 of the present invention;

[0018] Figure 2 is Figure 1 the structural schematic diagram of the up and down motion device in;

[0019] Figure 3 is Figure 1 the combined schematic diagram of the rotary motion device, the test head mold, and the swinging motion device in (the test head mold is at the 90° position);

[0020] Figure 4 is Figure 1 the combined schematic diagram of the rotary motion device, the test head mold, and the swinging motion device in (the test head mold is at the 0° position);

[0021] Figure 5 is Figure 1 the detailed schematic diagram of the test head mold in;

[0022] Figure 6 is Figure 1 the structural schematic diagram of the laser ranging device in. Detailed Embodiments

[0023] The following will further describe the present invention in conjunction with the drawings. It should be noted that this embodiment is based on the present technical solution and gives detailed implementation manners and specific operation processes, but the protection scope of the present invention is not limited to this embodiment.

[0024] Embodiment 1

[0025] This embodiment provides a special testing device for the firmness and flexibility of police helmets, as Figure 1 shown, which includes a main support frame 1, an up-and-down movement device 2, a rotary movement device 3, a test head mold 4, a swinging movement device 6, a laser ranging device, and a control box 7; the up-and-down movement device 2, the rotary movement device 3, the test head mold 4, the swinging movement device 6, the laser ranging device, and the control box are all arranged on the main support frame 1; the up-and-down movement device 2, the rotary movement device 3, the test head mold 4, the swinging movement device 6, and the laser ranging device are all communicatively connected to the control box. The test head mold is used to install the helmet 5 to be tested. The up-and-down movement device 2, the rotary movement device 3, and the swinging movement device 6 are respectively used to drive the test head mold 4 to move up and down, rotate left and right, and swing. The laser ranging device is used to measure the distance from the test head mold.

[0026] The main support frame 1 is the main frame of the special testing device for the firmness and flexibility of police helmets. In this embodiment, it is mainly composed of high-strength aluminum profiles, which can ensure a relatively light mass under sufficient mechanical strength and good corrosion resistance.

[0027] In this embodiment, as Figure 2 shown, the up-and-down movement device is composed of an optical encoder 21, a high-lead screw 22, a moving crossbeam 23, a follower synchronous pulley 24, a driving synchronous pulley 25, a synchronous belt 26, and an up-and-down servo motor and reducer 27; the up-and-down servo motor and reducer 27 are drivingly connected to the driving synchronous pulley 25, and the driving synchronous pulley 25 is drivingly connected to at least two follower synchronous pulleys 24 through the synchronous belt 26; each follower synchronous pulley 24 is respectively connected to a high-lead screw 22, and the moving crossbeam 23 is connected to each high-lead screw 22 through a screw nut; the optical encoder 21 is installed on the high-lead screw 22; the rotary movement device 3, the test head mold 4, and the swinging movement device 6 are all installed on the moving crossbeam 23.

[0028] It should be noted that the up-and-down servo motor and reducer drive the driving synchronous pulley to rotate. Through the transmission of the synchronous belt, the two follower synchronous pulleys respectively make the high-lead screws rotate synchronously, so that the moving crossbeam connected to the screw nut makes a reciprocating up-and-down movement, thereby driving the rotary movement device 3, the test head mold 4, and the swinging movement device 6 to move up and down reciprocally together. The speed of the crossbeam and the displacement of the up-and-down movement can be measured by the optical encoder installed on the high-lead screw.

[0029] In this embodiment, as Figure 3-4As shown, the rotary motion device 3 is composed of a rotary shaft coupling seat 32, a rotary servo motor and a speed reducer 31; the rotary servo motor and speed reducer 31 are drivingly connected to the rotary shaft coupling seat 32 and can drive the rotary shaft coupling seat 32 to rotate left and right; the test head mold 4 is connected to the rotary shaft coupling seat 32, and the rotary shaft coupling seat 32 can drive the test head mold 4 to rotate left and right. The rotary servo motor and speed reducer drive the rotary shaft coupling seat to rotate, so that the test head mold connected to the rotary shaft coupling seat realizes a left and right shaking action.

[0030] It should be noted that in this embodiment, the rotary motion device 3 further includes a zero-degree positioning sensor 33 and a 90-degree positioning sensor 34. The included angle between the zero-degree positioning sensor 33 and the 90-degree positioning sensor 34 is 90 degrees, and they are respectively used to sense the position of the test head mold 4 at 0° and 90°.

[0031] Specifically, when the head mold support rotates to the positions of 0° and 90°, the zero-degree positioning sensor 33 and the 90-degree positioning sensor 34 are exactly located below the simulated mandible 44.

[0032] In this embodiment, the test head mold 4 is composed of a half head mold 41, a head mold support seat 42, a force sensor 43 and a simulated mandible 44. The half head mold 41 is connected to the upper end of the head mold support seat 42, and the lower end of the head mold support seat 42 is connected to the rotary motion device 3 (specifically, the rotary shaft coupling seat 32); the shape of the half head mold 41 simulates the part of the human head wearing a helmet. The simulated mandible 44 is arranged on one side of the head mold support seat 42, and the force sensor 43 is arranged on the top of the simulated mandible to sense the force on the simulated mandible. The force sensor can be used to measure the force condition of the simulated mandible after the helmet chin strap is tightened. It should be noted that the simulated mandible 44 simulates the mandibular structure of the human body, and the upper and lower parts can open and close. The tightening force of the simulated mandible 44 can be adjusted by adjusting the tightening force of the chin strap, and the force can be obtained through the force sensor.

[0033] Preferably, the half head mold 41 is a cast aluminum component, and its surface can be covered with thin silicone to prevent it from being too smooth.

[0034] Specifically, in this embodiment, as Figure 5 shown, the head mold support seat 42 is provided with a half head mold connecting plate 45. The half head mold connecting plate 45 is connected to the half head mold 41 and is provided with an acceleration sensor 46. The acceleration sensor 46 is used to measure the rotation angle and swing angle of the half head mold.

[0035] Specifically, in this embodiment, the force sensor 43 is connected to the top of the simulated mandible 44 through a sensor coupling shaft 47, and the force sensor 43 is also fixed to the top of the simulated mandible 44 through a fixing screw 48.

[0036] In this embodiment, as Figure 3 shown, the swing motion device 5 is composed of a front swing rotation shaft 51, a main swing support seat 52, a swing servo motor and a speed reducer 55, a swing shaft coupling seat 54, a rear swing rotation shaft 53, and a support frame 56; the rotation motion device 3 (specifically, the rotation shaft coupling seat 32) is connected to the main swing support seat 52, both ends of the main swing support seat 52 are respectively connected to the front swing rotation shaft 51 and the rear swing rotation shaft 53, the front swing rotation shaft 51 and the rear swing rotation shaft 53 are respectively rotatably connected to the support frame 56 through the swing shaft coupling seat 54; the swing servo motor and the speed reducer 55 are drivingly connected to the rear swing rotation shaft 53; the support frame 56 is connected to the vertical motion device (specifically, the motion cross beam of the vertical motion device). The main swing support seat is respectively connected to the front swing rotation shaft and the rear swing rotation shaft to form a swing component, and the swing servo motor and the speed reducer drive the rear swing rotation shaft to rotate, thereby driving the main swing support seat to swing.

[0037] In this embodiment, as Figure 6 shown, the laser ranging device is composed of a laser sensor 84, an upper sensor support 81, an adjustment knob 83, and a lower sensor support 82; the lower sensor support 82 is installed on one side of the head mold support seat 42, the upper sensor support 81 and the lower sensor support 82 are rotatably connected, the laser sensor 84 is rotatably connected to the upper sensor support 81 through the adjustment knob, and the laser sensor 84 is used to measure the distance between the laser sensor and the helmet to be tested. The angle of the laser sensor 84 can be adjusted by rotating the upper sensor support 81 and the adjustment knob 83.

[0038] The control box is the electrical installation part for the test operation, used to connect to a computer, receive instructions issued by the computer, and control each device to complete various instructions, so as to realize the test of the helmet to be tested. In this embodiment, the control box is configured with an emergency stop switch 9, a power switch 10, and a power indicator light 11.

[0039] In this embodiment, all servo motors adopt a fully-closed-loop AC servo system, which is the key drive system for position control and speed control in the device. All speed reducers adopt high-precision planetary speed reducers, which are the precision mechanical reduction systems for position control and speed control in the device. The control box uses a programmable logic controller, which can control 6 servo motors, has 6 high-speed pulse inputs, 4 16-bit AD conversion inputs, 2 12-bit DA outputs, a special force value acquisition module, and built-in Ethernet, RS232, RS485, USB, CAN communication ports, as well as 28-point IO ports. It is the core control system that controls the reliable operation of the entire system. The programmable logic controller communicates with the computer using Ethernet communication, and the communication protocol uses the MODBUS industrial communication protocol, ensuring high reliability of data communication. The software is programmed using the C# language. The acceleration acquisition uses modular-designed hardware in the form of an eight-channel chassis. It realizes multi-channel parallel synchronous high-speed long-time continuous sampling, with an independent voltage amplifier, a 24-bit A / D converter, a low-pass filter, and an anti-aliasing filter for each channel to eliminate the crosstalk effect between channels and improve the anti-interference ability of the system. The software is programmed using the VC language.

[0040] Embodiment 2

[0041] This embodiment provides a method for testing the firmness and flexibility of a police helmet using the testing device described in Embodiment 1. The specific process is as follows:

[0042] 1) Turn on the power switch of the control box to power on the entire device.

[0043] 2) Send a control instruction from the computer to the control box to make the control box control the up-and-down movement device to move up or down, driving the test head mold to move to an appropriate test up-and-down position.

[0044] 3) Send a control instruction from the computer to the control box to make the control box control the rotary movement device to rotate left and right and the swinging movement device to swing up and down, driving the test head mold to automatically return to the horizontal and vertical position, that is, the face of the head mold faces directly forward.

[0045] 4) Input the test information into the computer, including the test number, the submitting unit, the sample name, the test date, the ambient temperature (°C), the ambient humidity (%RH), the tester, the administrator, the execution standard, the mandibular tightening force value (N), etc. The mandibular tightening force value is specified as 20 N, and input the test parameters, which include the test method, the linear distance (mm), the rotation angle (°), the pitch angle (°), the test frequency (Hz), the test time (min), etc. The test methods include the up and down movement of the helmet, the rotational movement of the helmet, the pitch swing movement of the helmet, and the left and right swing movement of the helmet. The up and down movement of the helmet is realized by driving the helmet with the up and down movement device, the rotational movement of the helmet is realized by driving the helmet with the rotational movement device, the pitch swing movement of the helmet is realized by driving the helmet with the swing movement device after the rotational movement device drives the helmet to rotate to the 90° position (as shown in Figure 3 shown), and the left and right swing movement of the helmet is realized by driving the helmet with the swing movement device after the rotational movement device drives the helmet to rotate to the 0° position (as shown in Figure 4 shown).

[0046] When selecting the "up and down movement of the helmet" test method, three data, namely the linear distance, the test frequency, and the test time, need to be input. Preferably, the set value of the linear distance is 20 mm, the set value of the test frequency is 2 Hz, and the set value of the test time is 10 min.

[0047] When selecting the "rotational movement of the helmet" test method, three data, namely the rotation angle, the test frequency, and the test time, need to be input. Preferably, the set value of the rotation angle is 30°, the set value of the test frequency is 2 Hz, and the set value of the test time is 10 min.

[0048] When selecting the "pitch swing movement of the helmet" test method, three data, namely the pitch angle, the test frequency, and the test time, need to be input. Preferably, the set value of the pitch angle is 20°, the set value of the test frequency is 2 Hz, and the set value of the test time is 10 min.

[0049] When selecting the "left and right swing movement of the helmet" test method, three data, namely the swing angle, the test frequency, and the test time, need to be input. Preferably, the set value of the swing angle is 20°, the set value of the test frequency is 2 Hz, and the set value of the test time is 10 min.

[0050] Save the test information and data and download the test data to the control box at the same time.

[0051] 5) Send a control instruction from the computer to the control box to clear the force value of the force sensor in the control box.

[0052] 6) Wear the helmet to be tested on the half head mold, fasten the chin strap of the helmet to be tested on the simulated chin, adjust the tension of the fastened chin strap so that the force value measured by the force sensor shows the specified force value for chin fastening. Adjust the angle of the laser distance measuring device so that the laser spot shines on the lower edge of the helmet to be tested, and send a control command to the control box through the computer. The control box controls the measurement data of the laser distance measuring device to be cleared. The distance change from the laser distance measuring device to the helmet to be tested can be measured, thereby measuring the displacement data of the laser distance measuring device.

[0053] 7) Start the test process. The control box controls the up and down movement device, the rotational movement device and the swinging movement device to act according to the pre-set test parameters, driving the helmet to be tested to perform corresponding actions, and the test stops after reaching the test time. During this process, the test interface of the computer displays and records in real time the force value measured by the force sensor, the displacement of the helmet to be tested, the up and down distance of the test head mold, the rotation angle of the test head mold, the swinging angle of the test head mold, and the data information of the test time, and draws real-time curve graphs of the force value, displacement and test time; records the force value on the simulated chin, the start value and end value of the displacement of the helmet to be tested at the start of the test. The firmness performance of the helmet wearing is evaluated by the force value on the simulated chin and the change of the displacement of the helmet to be tested.

[0054] 8) Generate a Word document from the test data, save it as another file to save the test report and print the test report.

[0055] 9) Query the test information and results in the database query interface through "test number" or "test date" or "test date range", generate a Word document, and save the test curve chart as another file.

[0056] For those skilled in the art, various corresponding changes and deformations can be given according to the above technical solutions and concepts, and all these changes and deformations should be included within the protection scope of the claims of the present invention.

Claims

1. A special testing device for the firmness and flexibility of police helmets, characterized in that, It includes a main body support frame, an up-and-down motion device, a rotational motion device, a test head mold, a swing motion device, a laser ranging device and a control box; the up-and-down motion device, the rotational motion device, the test head mold, the swing motion device, the laser ranging device and the control box are all arranged on the main body support frame; the up-and-down motion device, the rotational motion device, the test head mold, the swing motion device, the laser ranging device are all communicatively connected to the control box, the test head mold is used for installing the helmet to be tested, and the up-and-down motion device, the rotational motion device, the swing motion device are respectively used for driving the test head mold to move up and down, rotate left and right, and swing; the laser ranging device is used for measuring the distance from the test head mold. The up-and-down motion device consists of an optical encoder, a high-lead screw, a motion crossbeam, follower synchronous belt pulleys, a driving synchronous belt pulley, a synchronous belt, an up-and-down servo motor and a reducer; the up-and-down servo motor and the reducer are drivingly connected to the driving synchronous belt pulley, and the driving synchronous belt pulley is drivingly connected to at least two follower synchronous belt pulleys through the synchronous belt; each follower synchronous belt pulley is respectively connected to a high-lead screw, and the motion crossbeam is connected to each high-lead screw through a screw nut; the optical encoder is installed on the high-lead screw; the rotational motion device, the test head mold and the swing motion device are all installed on the motion crossbeam. The test head mold consists of a half head mold, a head mold support seat, a force sensor and a simulated mandible; the half head mold is connected to the upper end of the head mold support seat, and the lower end of the head mold support seat is connected to the rotational motion device; the shape of the half head mold simulates the part of the human head wearing a helmet, the simulated mandible is arranged on one side of the head mold support seat, and the force sensor is arranged on the top of the simulated mandible for sensing the force on the simulated mandible. An acceleration sensor is arranged on the head mold support seat, and the acceleration sensor is used for measuring the rotational angle and the swing angle of the half head mold. The swing motion device consists of a swing front rotating shaft, a swing main support seat, a swing servo motor and a reducer, a swing shaft connecting seat, a swing rear rotating shaft and a support frame; the rotational motion device is connected to the swing main support seat, the two ends of the swing main support seat are respectively connected to the swing front rotating shaft and the swing rear rotating shaft, the swing front rotating shaft and the swing rear rotating shaft are respectively rotatably connected to the support frame through the swing shaft connecting seat; the swing servo motor and the reducer are drivingly connected to the swing rear rotating shaft; the support frame is connected to the up-and-down motion device.

2. The special test device for the firmness and flexibility of police helmets according to claim 1, wherein, The rotational motion device consists of a rotation shaft connecting seat and a rotation servo motor and a reducer; the rotation servo motor and the reducer are drivingly connected to the rotation shaft connecting seat and can drive the rotation shaft connecting seat to rotate left and right; the test head mold is connected to the rotation shaft connecting seat, and the rotation shaft connecting seat can drive the test head mold to rotate left and right.

3. The special testing device for the firmness and flexibility of a police helmet according to claim 2, wherein The rotational motion device further includes a zero-degree positioning sensor and a 90-degree positioning sensor, and the included angle between the zero-degree positioning sensor and the 90-degree positioning sensor is 90 degrees, which are respectively used for sensing the position of the test head mold at 0° and 90°.

4. The special test device for the firmness and flexibility of a police helmet according to claim 1, wherein, The half head mold is a cast aluminum component, and its surface is covered with a thin layer of silica gel.

5. The special test device for the firmness and flexibility of a police helmet according to claim 1, wherein The laser ranging device consists of a laser sensor, an upper sensor bracket, an adjustment knob, and a lower sensor bracket; the lower sensor bracket is installed on one side of the test head mold, the upper sensor bracket and the lower sensor bracket are rotatably connected, the laser sensor is rotatably connected to the upper sensor bracket through the adjustment knob, and the laser sensor is used to measure the distance between the laser sensor and the helmet to be tested.

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