A breathing apparatus winding composite cylinder strength detection device and manufacturing process

Abstract

The application relates to the technical field of strength detection, and discloses a breathing apparatus winding composite gas cylinder strength detection device and a manufacturing process, wherein the breathing apparatus winding composite gas cylinder strength detection device comprises a test table, a rack arranged on the test table, a pulley lifting unit, a sliding seat and a hammer head, further comprises an ejection mechanism, the ejection mechanism comprises a cavity arranged in the hammer head, a bottom cylinder fixed at the bottom of the cavity and a sleeve slidingly sleeved outside the bottom cylinder, a partition plate is fixed in the sleeve, the partition plate divides the inner cavity of the sleeve into a first chamber and a second chamber from top to bottom in sequence, a channel is arranged through the partition plate, an impact rod is arranged through the channel, and the bottom end of the impact rod extends into the second chamber and is used for performing secondary impact detection. The ejection mechanism is arranged, the impact rod is ejected at high speed from the ejection port by triggering, the same area of the gas cylinder which has been impacted is punctured and hit, and the composite impact load that the gas cylinder may suffer in an actual accident can be effectively simulated.

Description

Technical Field

[0001] This invention relates to the field of strength testing technology, and in particular to a strength testing device and manufacturing process for a respirator-wound composite gas cylinder. Background Technology

[0002] Breathing apparatus wound composite gas cylinders are advanced pressure vessels made by winding high-strength fibers onto a metal or plastic inner liner and then curing them with resin. They are mainly used in fields with extremely high requirements for equipment weight and safety, such as fire fighting, emergency rescue, industrial protection, diving, and aerospace. As the core gas storage component of positive pressure air respirators or oxygen respirators, they provide breathing air to ensure the life of personnel in dangerous, oxygen-deficient, or harmful gas environments. The strength of the gas cylinder mainly refers to its ability to maintain structural integrity and not rupture or excessive plastic deformation under the combined action of internal pressure load and external mechanical load, thereby ensuring safe use. This includes static strength, fatigue strength, burst strength, and impact resistance.

[0003] Among them, impact resistance is a key test item for evaluating whether it can withstand sudden events such as accidental drops and collisions. The commonly used test method is the drop hammer impact test: using a drop hammer impact tester, a hammer of a certain mass is lifted to a specified height and then released freely, so that it impacts a gas cylinder sample filled with gas at a specified pressure with a specific energy. Then, its impact resistance is determined by checking whether it breaks, leaks or deforms.

[0004] In existing technologies, the traditional drop hammer impact test method, which is relied upon for strength testing of gas cylinders, can usually only apply a predetermined energy impact to the gas cylinder sample using a single impact head of a single type. However, in actual use, transportation, or accident scenarios, the impacts that gas cylinders may encounter are not a fixed single impact. The working conditions they face may be multiple consecutive impacts after falling from a height, or after suffering a large-area blunt impact, they may be hit a second time by flying sharp metal or glass fragments. Although the initial impact may not cause immediate rupture, it may cause hidden defects such as fiber damage, matrix microcracks, or interface delamination within the composite material layer, resulting in a significant degradation of the mechanical properties of that area. On the basis of this damage, if it continues to be hit by flying sharp debris, it is very easy to cause the gas cylinder to be penetrated or torn. Relying on a single fixed-mode impact test cannot simulate the above-mentioned multi-stage damage accumulation process, thus affecting the test results. Summary of the Invention

[0005] The purpose of this invention is to provide a strength testing device and manufacturing process for a respirator-wound composite gas cylinder, in order to solve the problem mentioned in the background art that traditional drop hammer impact tests usually only use a single-shaped impact head to apply a single impact to the gas cylinder sample.

[0006] The present invention provides a device and manufacturing process for testing the strength of a respirator-wound composite gas cylinder, which adopts the following technical solution:

[0007] One of the devices, a respirator-wound composite gas cylinder strength testing device, includes a test bench, a frame mounted on the test bench, a pulley lifting unit mounted on the frame, a sliding seat slidably mounted on the frame, and an impact hammer mounted below the sliding seat. It also includes:

[0008] An ejection mechanism is disposed within an impact hammer head. The ejection mechanism includes a cavity formed within the impact hammer head, a bottom cylinder fixed to the bottom of the cavity, and a sleeve slidably fitted onto the outside of the bottom cylinder. A partition plate is fixed inside the sleeve, dividing the inner cavity of the sleeve into a first chamber and a second chamber from top to bottom. A channel is formed through the partition plate, through which an impact rod passes. The top end of the impact rod extends into the first chamber and is fixed with a stop block. The bottom end of the impact rod extends into the second chamber for performing secondary impact detection. A conical block is fixed on the impact rod, and the bottom edge of the conical block abuts against the top of the bottom cylinder. An abutment plate is fixed in the second chamber, with an inclined surface on the side of the abutment plate facing the conical block. A first spring is fitted on the impact rod, with its two ends fixed to the bottom of the partition plate and the end face of the conical block, respectively. A second spring is disposed between the sleeve and the cavity. An ejection port for ejecting the impact rod is formed at the bottom of the impact hammer head.

[0009] Furthermore, the impact rod, stop block, and cone block are all arranged at an angle relative to the axis of the cavity.

[0010] Furthermore, the impact hammer head is also provided with a power storage mechanism, which includes a movable groove opened on the top of the impact hammer head and communicating with the cavity, a shaft rotatably connected in the movable groove, a ratchet fixed on the shaft, and a connecting rod hinged to the ratchet. The other end of the connecting rod extends into the cavity and is hinged to the sleeve.

[0011] Furthermore, the power storage mechanism also includes a turntable rotatably connected in the movable slot, a pawl rotatably connected to the turntable via a rotating shaft, and a first torsion spring disposed on the rotating shaft.

[0012] Furthermore, the power storage mechanism also includes a sleeve rod fixed coaxially with the turntable, a winding wheel fixed on the sleeve rod, and a support base fixed in the movable groove. The shaft rod movably passes through the central hole of the turntable, the sleeve rod, and the winding wheel. The sleeve rod is rotatably connected to the support base. A second torsion spring is sleeved on the sleeve rod. The two ends of the second torsion spring are respectively fixed on the support base and the winding wheel. A steel rope is provided on the winding wheel.

[0013] Furthermore, one end of the steel rope is fixed to the winding reel, and the remaining part is wound around the surface of the winding reel. The other end of the steel rope passes through the impact hammer head and the sliding seat and is fixed to a vertical pole. A horizontal bar is fixed to the top of the vertical pole. A mounting base is fixed on the frame, and a groove for inserting the horizontal bar is provided on the mounting base. An electric push rod is installed on the frame, and a pin is fixed to the output end of the electric push rod. The pin is inserted into the insertion hole opened on the horizontal bar.

[0014] Furthermore, the sliding seat has an opening for the steel rope to pass through, and an abutment post with the same axis as the upright is fixed at the top of the opening.

[0015] Furthermore, a button is provided at the top of the inside of the groove, and the button is electrically connected to the electric push rod.

[0016] Furthermore, a slider is fixed to the side wall of the sleeve, and a groove is provided in the cavity for the slider to slide.

[0017] A manufacturing process for a respirator-wound composite gas cylinder, employing the aforementioned respirator-wound composite gas cylinder strength testing device, includes the following steps:

[0018] Step 1: Weigh epoxy resin, single-walled carbon nanotubes, carbon fibers and curing agent. The amount of carbon nanotubes added is between 3wt.% and 10wt.%. The carbon nanotubes and epoxy resin in the resin matrix are premixed in proportion and dispersed using a three-roll mill or a mixer.

[0019] Step 2: Slowly add the dispersed carbon nanotubes to the epoxy resin matrix preheated to the specified temperature, continue stirring and add curing agent, and after uniform mixing, obtain a resin system containing carbon nanotubes, ensuring that the carbon nanotubes are evenly distributed and free of bubbles.

[0020] Step 3: The carbon fiber is prepared using the Type III winding process, impregnated with the prepared resin system to allow the resin to fully penetrate the fiber, and then wound on the winding machine according to the set path to form a composite gas cylinder blank.

[0021] Step 4: Place the wound gas cylinder blank in a curing oven and cure it according to the set temperature and time to allow the resin to cure completely. After curing, perform appearance inspection and dimensional verification to obtain a lightweight and high-strength Type III wound composite gas cylinder.

[0022] Step 5: Perform performance verification on the prepared respirator-wound composite gas cylinder. Fill the gas cylinder to the specified pressure and fix it on the test bench. Perform a first impact test and then perform a second impact test through the ejection mechanism.

[0023] The beneficial effects of this invention are:

[0024] 1. By setting up an ejection mechanism, after the respirator-wrapped composite gas cylinder strength testing device completes a routine single-fall impact test, the accumulated energy is converted into the rapid ejection of the impact rod through the cooperation of the impact rod, the conical block and the abutment plate. The impact rod is triggered to eject at high speed from the ejection port, piercing the same area of ​​the gas cylinder that has already been impacted. This can effectively simulate the composite impact load that the gas cylinder may suffer in actual accidents, such as being hit by a blunt object first and then by a sharp fragment. This allows for a more realistic assessment of the gas cylinder's damage tolerance and remaining strength.

[0025] 2. By setting up a power storage mechanism, the kinetic energy of the impact hammer during its free fall is used to drive the winding wheel to rotate through the unwinding of the steel rope, causing the second torsion spring to twist and store energy. After one impact, the stored torsion spring potential energy is released to drive the ratchet and connecting rod, which can simulate multiple consecutive secondary impacts, improving the realism of the working condition simulation. At the same time, it further improves the detection efficiency and reduces the tedious operation of repeatedly lifting the impact hammer. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0027] Figure 2 This is a three-dimensional structural diagram of the sliding seat and impact hammer head of the present invention;

[0028] Figure 3 This is a three-dimensional cross-sectional view of the impact hammer and ejection mechanism of the present invention.

[0029] Figure 4 This is a three-dimensional cross-sectional view of the impact hammer and sleeve of the present invention.

[0030] Figure 5 This is a side view cross-sectional diagram of the impact hammer head of the present invention;

[0031] Figure 6 This is a three-dimensional structural diagram of the sleeve, ratchet, connecting rod, and turntable of the present invention.

[0032] Figure 7 This is a three-dimensional cross-sectional view of the shaft, ratchet, turntable, and sleeve of the present invention.

[0033] Figure 8 This is a schematic diagram illustrating the ejection state of the impact rod structure of the present invention;

[0034] Figure 9 This is a three-dimensional structural diagram of the frame, sliding seat, impact hammer, steel rope, upright and mounting base of the present invention;

[0035] Figure 10 This is a three-dimensional cross-sectional view of the sliding seat of the present invention;

[0036] Figure 11 This is a three-dimensional structural diagram of the upright, crossbar, mounting base, and electric push rod of the present invention.

[0037] Figure 12 This is a three-dimensional structural diagram of the mounting base of the present invention.

[0038] In the picture:

[0039] 100. Test stand; 200. Frame; 300. Pulley lifting unit; 400. Sliding seat; 500. Impact hammer; 600. Ejection mechanism; 601. Cavity; 602. Bottom cylinder; 603. Sleeve; 6031. First chamber; 6032. Second chamber; 6033. Slider; 604. Partition plate; 605. Channel; 606. Impact rod; 607. Stop block; 608. Conical block; 609. Abutment plate; 610. First spring; 611. Second spring; 612. Spring 700. Inlet; 701. Power storage mechanism; 702. Movable groove; 703. Shaft; 704. Ratchet; 705. Connecting rod; 706. Turntable; 707. Rotating shaft; 708. Pawl; 709. First torsion spring; 710. Sleeve rod; 711. Rewinding wheel; 712. Support seat; 713. Second torsion spring; 714. Steel rope; 715. Upright; 716. Crossbar; 717. Mounting seat; 718. Groove; 719. Electric push rod; 720. Pin; 721. Abutment post; 722. Button. Detailed Implementation

[0040] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] Example 1, refer to Figures 1-2 A respirator-wound composite gas cylinder strength testing device includes a test bench 100, a frame 200 mounted on the test bench 100, a pulley lifting unit 300 mounted on the frame 200, a sliding seat 400 slidably mounted on the frame 200, and an impact hammer 500 mounted below the sliding seat 400. During testing, the pulley lifting unit 300 controls the sliding seat 400 to lift the impact hammer 500 to a preset height and then allow it to fall freely, thus performing an impact test on the gas cylinder placed on the test bench 100.

[0042] Reference Figures 3-5It also includes an ejection mechanism 600, which is disposed within the impact hammer head 500 and is used to perform a secondary impact test after the primary impact test. The ejection mechanism 600 includes a cavity 601 formed within the impact hammer head 500, a bottom cylinder 602 fixed to the bottom of the cavity 601, and a sleeve 603 slidably sleeved outside the bottom cylinder 602. The sleeve 603 can slide up and down along the axial direction of the cavity 601. A partition 604 is fixed inside the sleeve 603, and the partition 604 holds the sleeve 603 in place. The inner cavity is divided into a first chamber 6031 and a second chamber 6032 from top to bottom. A channel 605 is provided through the partition 604. An impact rod 606 passes through the channel 605. The top end of the impact rod 606 extends into the first chamber 6031 and is fixed with a stop block 607. The bottom end of the impact rod 606 extends into the second chamber 6032 for performing secondary impact detection. The bottom of the impact hammer head 500 is provided with an ejection port 612 for ejecting the impact rod 606.

[0043] A conical block 608 is fixed to the impact rod 606. The bottom edge of the conical block 608 abuts against the top of the bottom cylinder 602. An abutment plate 609 is fixed inside the second chamber 6032. The side of the abutment plate 609 facing the conical block 608 is inclined. A first spring 610 is sleeved on the impact rod 606. The two ends of the first spring 610 are fixed to the bottom of the partition plate 604 and the end face of the conical block 608, respectively, to provide ejection force when the impact rod 606 moves downward. A second spring 611 is provided between the sleeve 603 and the cavity 601. The second spring 611 is sleeved on the outside of the sleeve 603, and its two ends are fixed to the sleeve 603 and the cavity 601, respectively. Inside, it is used to provide an upward rebound force after the sleeve 603 is pressed downward. After the impact hammer head 500 completes one impact and stops, it drives the sleeve 603 to move downward. During the downward movement of the sleeve 603, the inclined surface of the abutment plate 609 will contact the conical block 608. Under the action of force, the conical block 608 will slide relative to the abutment plate 609, thereby causing the conical block 608 to disengage from the top of the bottom cylinder 602. Once the abutment is released, when the impact rod 606 slides to the ejection port 612, under the elastic action of the first spring 610, the impact rod 606 will quickly eject downward, thereby completing the secondary impact detection of the gas cylinder.

[0044] The impact rod 606, the stop block 607, and the conical block 608 are all obliquely arranged relative to the axis of the cavity 601. This makes it easier for the conical block 608 to move laterally and break away from the bottom cylinder 602 when it is subjected to the force of the inclined surface of the abutment plate 609, thereby enabling the impact rod 606 to be ejected smoothly.

[0045] Furthermore, in order to accommodate the deflection of the impact rod 606 for easy ejection, the ejection port 612 is positioned at an angle, corresponding to the deflection direction of the impact rod 606, but not on the same axis. Initially, the bottom of the impact rod 606 is at the edge of the ejection port 612. When the conical block 608 contacts the inclined surface of the abutment plate 609, the impact rod 606, under the action of the ejection force, can smoothly eject from the ejection port 612 along its own deflection trajectory, thereby ensuring the effectiveness and smoothness of the impact rod 606 during secondary impact.

[0046] Reference Figures 5-8 The impact hammer head 500 is also equipped with a power storage mechanism 700. Specifically, the power storage mechanism 700 includes a movable groove 701 opened on the top of the impact hammer head 500 and communicating with the cavity 601, a shaft 702 rotatably connected in the movable groove 701, a ratchet 703 fixed on the shaft 702, and a connecting rod 704 hinged to the ratchet 703. The other end of the connecting rod 704 extends into the cavity 601 and is hinged to the sleeve 603. Under the rotation of the ratchet 703 and the action of the connecting rod 704, the sleeve 603 can be controlled to slide up and down along the cavity 601.

[0047] The sleeve 603 has a slider 6033 fixed to its side wall, and a groove is provided in the cavity 601 for the slider 6033 to slide. The cooperation between the slider 6033 and the groove is used to limit and guide the up and down sliding of the sleeve 603.

[0048] Furthermore, the power storage mechanism 700 also includes a turntable 705 rotatably connected in the movable slot 701, a pawl 707 rotatably connected to the turntable 705 via a rotating shaft 706, and a first torsion spring 708 disposed on the rotating shaft 706. The two ends of the first torsion spring 708 are respectively fixed to the rotating shaft 706 and the turntable 705. The first torsion spring 708 is used to drive the pawl 707 to engage with the ratchet 703, ensuring that energy can be effectively transferred to the ratchet 703 after power storage, thereby driving the connecting rod 704 and the sleeve 603.

[0049] The energy storage mechanism 700 also includes a sleeve rod 709 coaxially fixed to the turntable 705, a winding wheel 710 fixed to the sleeve rod 709, and a support seat 711 fixed in the movable groove 701. The shaft rod 702 movably passes through the central hole of the turntable 705, the sleeve rod 709, and the winding wheel 710. The sleeve rod 709 is rotatably connected to the support seat 711. A second torsion spring 712 is sleeved on the sleeve rod 709. The two ends of the second torsion spring 712 are fixed to the support seat 711 and the winding wheel 710, respectively. A steel rope 713 is provided on the winding wheel 710. When the steel rope 713 is pulled, it can drive the winding wheel 710 to rotate, causing the second torsion spring 712 to torsion and store energy. Therefore, during the descent of the impact hammer head 500, the unwinding of the steel rope 713 drives the winding wheel 710 and the turntable 705 to rotate, enabling the second torsion spring 712 to store energy and provide power for the secondary impact.

[0050] Reference Figures 9-12 One end of the steel rope 713 is fixed to the winding reel 710, and the remaining part is wound around the surface of the winding reel 710. The other end of the steel rope 713 passes through the impact hammer head 500 and the sliding seat 400 and is fixed to the upright 714. A crossbar 715 is fixed to the top of the upright 714. A mounting base 716 is fixed on the frame 200. The mounting base 716 has a groove 717 for the crossbar 715 to be inserted. An electric push rod 718 is installed on the frame 200. The output end of the push rod 718 is fixed with a pin 719, which is inserted into a hole on the crossbar 715. When the impact hammer 500 falls freely, the crossbar 715 is fixed, and the steel rope 713 is unwound as the impact hammer 500 falls, pulling the winding wheel 710 to rotate, thereby storing force in the second torsion spring 712. The electric push rod 718 and the pin 719 ensure that the crossbar 715 can be fixed, ensuring that the force storage process proceeds smoothly.

[0051] It should be noted that the sliding seat 400 has an opening for the steel rope 713 to pass through. The top of the opening is fixed with an abutment post 720 that is on the same axis as the upright 714. After the steel rope 713 is fully wound up, the bottom of the upright 714 can contact the top of the abutment post 720, thereby maintaining the vertical posture of the upright 714 and providing stable support for it. Thus, when the impact hammer 500 is raised again, the crossbar 715 can be smoothly inserted into the groove 717.

[0052] Reference Figures 11-12Specifically, a button 721 is provided at the top of the inner part of the groove 717. The button 721 is electrically connected to the electric push rod 718. After the sliding seat 400 and the impact hammer 500 are lifted to a preset height by the pulley lifting unit 300, the crossbar 715 is inserted into the groove 717 and contacts the button 721. After the button 721 is triggered, it controls the electric push rod 718 to extend and drive the pin 719 to be inserted into the socket on the crossbar 715, thereby fixing the crossbar 715. At this time, when the sliding seat 400 drives the impact hammer 500 to fall freely, since the crossbar 715 has been fixed on the frame 200, the steel rope 713 is in the free fall of the impact hammer 500. The unwinding process during the fall causes the take-up wheel 710 to rotate the turntable 705, which in turn causes the second torsion spring 712 to store energy. When the impact hammer 500 completes an impact detection and comes to a stop, the completion of an impact can be detected by a preset timing control or by a signal fed back from the impact sensor. Then, an external controller sends a command to control the electric push rod 718 to retract, thereby releasing the fixation on the crossbar 715 and allowing the energy stored in the second torsion spring 712 to be released quickly. Through the cooperation of the pawl 707 and the ratchet 703, the ratchet 703 is controlled to rotate synchronously, which in turn drives the sleeve 603 to move downward through the connecting rod 704 connected to the ratchet 703.

[0053] The working principle of a respirator-wound composite gas cylinder strength testing device is as follows: First, the respirator-wound composite gas cylinder to be tested is filled to a specified pressure and fixed on the test bench 100. Through the pulley lifting unit 300, the sliding seat 400 and the impact hammer head 500 are lifted to a preset initial height. At this height, the crossbar 715 is engaged in the groove 717 and contacts the button 721 inside. The button 721 then triggers the electric push rod 718 to extend, so that the pin 719 fixed at its output end is inserted into the insertion hole opened on the crossbar 715, thereby temporarily fixing the crossbar 715 on the frame 200.

[0054] Subsequently, the pulley lifting unit 300 releases the sliding seat 400, causing it to drive the impact hammer head 500 in free fall, applying an impact test to the gas cylinder on the test bench 100. During the free fall of the impact hammer head 500, since the crossbar 715 is fixed to the frame 200, and one end of the steel rope 713 is fixed to the winding wheel 710 and wound around its surface, the steel rope 713 will continuously unwind as the impact hammer head 500 falls. The unwinding of the steel rope 713 will pull the winding wheel 710 to rotate. Then, the rotating disk 705 is driven to rotate by the coaxial fixed sleeve 709. The rotation of the rotating disk 705 will transmit torque to the second torsion spring 712 sleeved on the sleeve 709, causing it to twist and store energy. During this process, the pawl 707 engages with the ratchet 703 under the drive of the first torsion spring 708. However, since the pawl 707 is designed to work in one direction, it only allows the winding wheel 710 to accumulate torsion in this direction, without driving the ratchet 703 to rotate. Therefore, the ratchet 703 remains stationary, and the stored energy is kept in the second torsion spring 712.

[0055] After the impact hammer 500 completes one impact and comes to rest on the test bench 100, an external controller sends a command to retract the electric push rod 718, causing the pin 719 to disengage from the insertion hole of the crossbar 715, thus releasing the fixation of the crossbar 715. After the fixation is released, the second torsion spring 712 will quickly release energy, causing the turntable 705 to rotate rapidly in the opposite direction. The rotation of the turntable 705 drives the ratchet 703 to rotate rapidly in sync via the pawl 707. The rapid rotation of the ratchet 703 will drive the sleeve 603 to move rapidly downward via the connecting rod 704 hinged to it. During the rapid downward movement of the sleeve 603, the inclined surface of the abutment plate 609 contacts the conical block 608, causing the conical block 608 to move rapidly downward at the inclined surface of the abutment plate 609. Under the lateral force of the surface, lateral sliding occurs, thereby releasing the contact between the bottom edge of the conical block 608 and the top of the bottom cylinder 602. Once the contact is released, the first spring 610 immediately releases its compressive energy, pushing the impact rod 606 to move rapidly downward and eject from the ejection port 612, performing a secondary impact test on the damaged area of ​​the gas cylinder after the first impact. In addition, due to the huge torque generated by the rapid release of the second torsion spring 712 after being released from fixation, the ratchet 703 can rotate multiple times. Therefore, the sleeve 603 can be driven by the connecting rod 704 to achieve multiple up and down movements. The ejection mechanism 600 can continuously perform multiple secondary impact tests, thereby effectively simulating the multi-stage damage accumulation process of the gas cylinder under complex working conditions.

[0056] Example 2: A manufacturing process for a respirator-wound composite gas cylinder, employing a respirator-wound composite gas cylinder strength testing device, includes the following steps:

[0057] Step 1: Weigh epoxy resin, single-walled carbon nanotubes, carbon fibers and curing agent. The amount of carbon nanotubes added is between 3wt.% and 10wt.%. The carbon nanotubes and epoxy resin in the resin matrix are premixed in proportion and dispersed using a three-roll mill or a mixer.

[0058] Step 2: Slowly add the dispersed carbon nanotubes to the epoxy resin matrix preheated to the specified temperature, continue stirring and add curing agent, and after uniform mixing, obtain a resin system containing carbon nanotubes, ensuring that the carbon nanotubes are evenly distributed and free of bubbles.

[0059] Step 3: The carbon fiber is prepared using the Type III winding process, impregnated with the prepared resin system to allow the resin to fully penetrate the fiber, and then wound on the winding machine according to the set path to form a composite gas cylinder blank.

[0060] Step 4: Place the wound gas cylinder blank in a curing oven and cure it according to the set temperature and time to allow the resin to cure completely. After curing, perform appearance inspection and dimensional verification to obtain a lightweight and high-strength Type III wound composite gas cylinder.

[0061] Step 5: Perform performance verification on the prepared respirator-wound composite gas cylinder. Fill the gas cylinder to the specified pressure and fix it on the test bench 100. Perform a first impact test and then perform a second impact test through the ejection mechanism 600.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A device for testing the strength of a respirator-wound composite gas cylinder, comprising a test bench (100), a frame (200) mounted on the test bench (100), a pulley lifting unit (300) mounted on the frame (200), a sliding seat (400) slidably mounted on the frame (200), and an impact hammer (500) mounted below the sliding seat (400), characterized in that, Also includes: An ejection mechanism (600) is disposed within an impact hammer head (500). The ejection mechanism (600) includes a cavity (601) formed within the impact hammer head (500), a bottom cylinder (602) fixed to the bottom of the cavity (601), and a sleeve (603) slidably sleeved outside the bottom cylinder (602). A partition (604) is fixed inside the sleeve (603), which divides the inner cavity of the sleeve (603) into a first chamber (6031) and a second chamber (6032) from top to bottom. A channel (605) is formed through the partition (604), and an impact rod (606) passes through the channel (605). The top end of the impact rod (606) extends into the first chamber (6031) and is fixed with a stop block (607). The bottom end of 6) extends into the second chamber (6032) for performing secondary impact detection. A conical block (608) is fixed on the impact rod (606). The bottom edge of the conical block (608) abuts against the top of the bottom cylinder (602). An abutment plate (609) is fixed in the second chamber (6032). The side of the abutment plate (609) facing the conical block (608) is inclined. A first spring (610) is sleeved on the impact rod (606). The two ends of the first spring (610) are fixed to the bottom of the partition plate (604) and the end face of the conical block (608), respectively. A second spring (611) is provided between the sleeve (603) and the cavity (601). An ejection port (612) for the impact rod (606) to be ejected is opened at the bottom of the impact hammer (500).

2. The respirator winding composite gas cylinder strength testing device according to claim 1, characterized in that, The impact rod (606), the stop block (607) and the conical block (608) are all obliquely arranged relative to the axis of the cavity (601).

3. The respirator winding composite gas cylinder strength testing device according to claim 1, characterized in that, The impact hammer (500) is also provided with a power storage mechanism (700). The power storage mechanism (700) includes a movable groove (701) opened on the top of the impact hammer (500) and communicating with the cavity (601), a shaft (702) rotatably connected in the movable groove (701), a ratchet (703) fixed on the shaft (702), and a connecting rod (704) hinged on the ratchet (703). The other end of the connecting rod (704) extends into the cavity (601) and is hinged to the sleeve (603).

4. The respirator winding composite gas cylinder strength testing device according to claim 3, characterized in that, The power storage mechanism (700) further includes a turntable (705) rotatably connected in the movable slot (701), a pawl (707) rotatably connected to the turntable (705) via a rotating shaft (706), and a first torsion spring (708) disposed on the rotating shaft (706).

5. The respirator winding composite gas cylinder strength testing device according to claim 4, characterized in that, The power storage mechanism (700) also includes a sleeve rod (709) coaxially fixed with the turntable (705), a winding wheel (710) fixed on the sleeve rod (709), and a support seat (711) fixed in the movable groove (701). The shaft rod (702) movably passes through the center hole of the turntable (705), the sleeve rod (709), and the winding wheel (710). The sleeve rod (709) is rotatably connected to the support seat (711). A second torsion spring (712) is sleeved on the sleeve rod (709). The two ends of the second torsion spring (712) are respectively fixed on the support seat (711) and the winding wheel (710). A steel rope (713) is provided on the winding wheel (710).

6. The respirator winding composite gas cylinder strength testing device according to claim 5, characterized in that, One end of the steel rope (713) is fixed to the winding wheel (710), and the rest is wound around the surface of the winding wheel (710). The other end of the steel rope (713) passes through the impact hammer head (500) and the sliding seat (400) and is fixed to the upright (714). A crossbar (715) is fixed to the top of the upright (714). A mounting seat (716) is fixed on the frame (200). A groove (717) for inserting the crossbar (715) is opened on the mounting seat (716). An electric push rod (718) is installed on the frame (200). A pin (719) is fixed to the output end of the electric push rod (718). The pin (719) is inserted into the insertion hole opened on the crossbar (715).

7. The respirator winding composite gas cylinder strength testing device according to claim 6, characterized in that, The sliding seat (400) has an opening for the steel rope (713) to pass through, and an abutment post (720) with the same axis as the upright (714) is fixed at the top of the opening.

8. The respirator winding composite gas cylinder strength testing device according to claim 6, characterized in that, A button (721) is provided at the top of the inside of the groove (717), and the button (721) is electrically connected to the electric push rod (718).

9. The respirator winding composite gas cylinder strength testing device according to claim 1, characterized in that, The sleeve (603) has a slider (6033) fixed to its side wall, and a groove for the slider (6033) to slide is provided in the cavity (601).

10. A manufacturing process for a respirator-wound composite gas cylinder, employing the respirator-wound composite gas cylinder strength testing device as described in claim 1, characterized in that... Includes the following steps: Step 1: Weigh epoxy resin, single-walled carbon nanotubes, carbon fibers and curing agent. The amount of carbon nanotubes added is between 3wt.% and 10wt.%. The carbon nanotubes and epoxy resin in the resin matrix are premixed in proportion and dispersed using a three-roll mill or a mixer. Step 2: Slowly add the dispersed carbon nanotubes to the epoxy resin matrix preheated to the specified temperature, continue stirring and add curing agent, and after uniform mixing, obtain a resin system containing carbon nanotubes, ensuring that the carbon nanotubes are evenly distributed and free of bubbles. Step 3: The carbon fiber is prepared using the Type III winding process, impregnated with the prepared resin system to allow the resin to fully penetrate the fiber, and then wound on the winding machine according to the set path to form a composite gas cylinder blank. Step 4: Place the wound gas cylinder blank in a curing oven and cure it according to the set temperature and time to allow the resin to cure completely. After curing, perform appearance inspection and dimensional verification to obtain a lightweight and high-strength Type III wound composite gas cylinder. Step 5: Perform performance verification on the prepared respirator-wound composite gas cylinder. Fill the gas cylinder to the specified pressure and fix it on the test bench (100). Perform a first impact test and then perform a second impact test through the ejection mechanism (600).

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