Helmet shell strength testing equipment

Abstract

The present invention discloses a helmet shell strength testing device, which relates to the technical field of security equipment processing. In this technical solution, a clamping table including a number of clamping monomers is provided. When the shell to be detected is placed above the clamping table, the driver is started to inject pressure into the confluence cavity. Due to the principle of communicating vessels, during the pressure injection process, both the inner pressure rod and the outer pressure rod can adaptively output outward, thereby driving the inner clamping plate and the outer clamping plate respectively to stably and evenly clamp the helmet shell; after the clamping assembly above the clamping table evenly clamps the shell, at this time, according to the test requirements, pressure items are selected, including vertical heavy pressure from top to bottom and impacts at multiple side positions. After determining the pressure test item by controlling the regulating valve or the flow dividing valve, the driver is started to apply pressure to the shell; during the pressure application process, the central controller receives and records the induced pressure change data of the pressure sensors at different points, and draws a pressure data curve through the built-in operation module.

Description

Technical Field

[0001] The present invention belongs to the technical field of security equipment processing, and particularly relates to a helmet shell strength testing device. Background Art

[0002] The riot helmet is an important security equipment, and its main protective component is the external shell structure; the higher the strength of the shell structure, the stronger the protective ability of the corresponding riot helmet; due to relevant policies and laws and regulations, generally the main protection directions of the riot helmet are still heavy pressure and point impact pressure, and an important manifestation of its protective ability is whether deformation will occur when subjected to such oppression;

[0003] In the prior art, in such pressure strength test experiments, usually the compression test of the finished product wearing simulation is carried out. Although this method can test the protective ability of the helmet finished product, due to the interference of structures such as the inner lining, it is difficult to accurately reflect the strength based on the shell itself; therefore, we design a strength testing device for the helmet shell to make such pressure test data more accurate. Summary of the Invention

[0004] The purpose of the present invention is to provide a helmet shell strength testing device to solve the problem that the existing finished helmet test scheme cannot accurately obtain the strength data of the shell itself.

[0005] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0006] The present invention is a helmet shell strength testing device, including a support base, a working plate, a clamping table and a driver. The driver is an electric hydraulic cylinder structure, which is arranged between the working plate and the support base; several support rods are bolted and fixed between the support base and the working plate, and the clamping table is arranged between the several support rods and bolted and fixed to the support rods; this technical solution simulates the bearing capacity of the shell when the helmet is under pressure and impact through the working plate, specifically testing the diffusion degree of the point force on the helmet shell after being under pressure and impact.

[0007] Furthermore, a main pressure cylinder, a diverter and several regulators are bolted and fixed on the upper surface of the working plate. The diverter is a right-angle joint structure, and auxiliary pressure cylinders are bolted and fixed at both opposite ends thereof; a working pipe is flange-connected to one side surface of the diverter, and one end of the working pipe penetrates through the working plate and extends to the bottom of the driver; a main pressure pipe is flange-connected between the top end of the working pipe and the main pressure cylinder, and a regulating valve is installed at the connection between the main pressure pipe and the working pipe; the regulating valve is a single-pass valve structure, that is, within the same working time, only one of the main pressure pipe and the working pipe is connected to the driver;

[0008] The main pressure rod is slidably engaged inside the main pressure cylinder, and a piston structure is formed between the two. A main pressure plate is welded and fixed to the lower end of the main pressure rod, and the main pressure plate is arranged directly above the clamping platform. The piston structure formed by the main pressure cylinder and the main pressure rod directly acts on the upper part of the helmet shell, which is used to simulate pressure application and realize pressure control by controlling the output of the driver. A plurality of swing pressure arms are hinged on the peripheral side surface of the working plate, and a pendulum is welded and fixed to one end of the swing pressure arm, and the pendulum is arranged below the working plate.

[0009] A driving gear is welded and fixed to the side surface of the hinge shaft of the swing pressure arm; an auxiliary pressure rod is slidably engaged with the inside of the auxiliary pressure cylinder, and a driving gear rod is welded and fixed to one side of the auxiliary pressure rod through a connecting rod; a plurality of driving grooves are opened inside the working plate, wherein the driving gear rod extends into the driving groove through the sliding connection of the connecting rod, and the tooth groove of the driving gear rod is meshed with the driving gear; a diverter valve is installed on the surface of the diverter, wherein the diverter valve is a three-way valve, and the two auxiliary pressure cylinders and the working pipe are connected through the diverter valve, that is, the three can achieve two-way and three-way communication through the diverter valve; in combination with the above structure, it should be noted that in the actual working structure, the number of swing pressure arms includes at least four groups, and the corresponding number of driving gear rods includes two groups, that is, in actual work, the diverter only needs to control two adjacent groups of swing pressure arms to achieve control of all swing pressure arms.

[0010] Furthermore, a driven gear is welded to one end of the hinge shaft; a linkage chamber is also provided inside the working plate, and the linkage chamber is arranged between two adjacent driven gears; a plurality of adjusting rods are slidably engaged with the upper surface of the working plate, and a linkage gear is rotatably engaged with the lower end of the adjusting rod, wherein the linkage gear is arranged inside the linkage chamber, and when the adjusting rod is pressed down, the two adjacent driven gears are meshed and linked through the linkage gear; based on the above principle, the number of linkage gears also includes two groups, i.e., they are arranged between the hinge shaft with the driving gear and one of the adjacent hinge shafts.

[0011] Furthermore, a driven plate is welded and fixed to the upper end of the adjusting rod, and a return spring is installed between the driven plate and the working plate; a driving plate is welded and fixed to one surface of the adjuster, and the driving plate is arranged directly above the driven plate; wherein the driving plate is an electromagnet, and the driven plate is a permanent magnet, and when the driving plate is energized, the two magnetically repel each other, that is, when the driving plate is energized, it uses the magnetic repulsion force to push the driven plate down, thereby making the linkage gear and the driven gear mesh; wherein in order to achieve flexible engagement, the linkage gear and the driven gear are both bevel gear structures; based on the above principles, in actual work, the operator can change the pressure item of the test by controlling the regulating valve, and change the number and direction of the impacted points by controlling the diverter valve.

[0012] Further, a number of clamping grooves are formed on the upper surface of the clamping table. An inner clamping plate and an outer clamping plate are slidably engaged inside the clamping groove. The two form a clamping unit, and there is a gap between the inner clamping plate and the outer clamping plate. The number of the clamping units is symmetrically distributed in pairs. Connecting springs are installed between the opposite ends of the clamping groove and the inner clamping plate and the outer clamping plate respectively. A confluence cavity is formed inside the clamping table. A number of inner cavity channels and a number of outer cavity channels are formed on the circumferential side of the confluence cavity. An inner pressure rod is slidably engaged inside the inner cavity channel, and the output end of the inner pressure rod is fixedly welded to the inner clamping plate. An outer pressure rod is slidably engaged inside the outer cavity channel, and the output end of the outer pressure rod is fixedly welded to the outer clamping plate. The lower end flange of the confluence cavity is connected to an auxiliary pressure pipe, and one end of the auxiliary pressure pipe extends and communicates with the bottom of the driver. A communicating vessel structure based on a piston structure is formed between the inner cavity channel and the outer cavity channel through the confluence cavity. Pressure sensors are embedded on the outer side surface of the inner clamping plate and the inner side surface of the outer clamping plate.

[0013] It should be supplemented and described that an infrared receiver is installed on the lower surface of the working plate, and an infrared transmitter is installed on the upper surface of the clamping table. That is, when a housing to be detected is placed above the clamping table, its own projection covers the infrared transmitter, thereby transmitting a corresponding light and shadow signal to the infrared receiver, and then controlling the start of the clamping assembly. Combining the foregoing structure, in the actual working process, when the housing to be detected is placed above the clamping table, the outer wall of the housing is usually placed between the inner clamping plate and the outer clamping plate. At this time, the driver is started to inject pressure into the confluence cavity. Due to the principle of the communicating vessel, during the pressure injection process, both the inner pressure rod and the outer pressure rod can adaptively output outward, so as to drive the inner clamping plate and the outer clamping plate to clamp the helmet housing stably and evenly respectively.

[0014] Further, shut-off valves are installed at the connections between the working pipe and the auxiliary pressure pipe and the driver. A central controller is also installed on the upper surface of the support base. The shut-off valve, the regulating valve and the flow dividing valve are all solenoid valves, and are all electrically connected to the central controller and controlled by it. The drive motor and the drive plate of the driver are both electrically connected to the central controller and controlled by it.

[0015] Further, an operation module and a digital-to-analog conversion module are arranged inside the central controller. The digital-to-analog conversion module receives the pressure data sensed by the pressure sensor and converts it into digital information and sends it to the operation module. The central controller also includes a storage module and a display module, both of which receive the data calculated by the operation module, and store and display it respectively.

[0016] The present invention has the following beneficial effects:

[0017] This technical solution tests the bearing capacity of the shell by setting up a working board to simulate the helmet under compression and impact, specifically testing the degree of force diffusion at the point where the helmet shell is under compression and impact; among them, the piston structure composed of the main pressure cylinder and the main pressure rod directly acts above the helmet shell to simulate pressure application, and the pressure is controlled by controlling the output of the driver;

[0018] Meanwhile, this technical solution tests the bearing capacity of the shell by setting up a clamping table containing several clamping monomers. When the shell to be detected is placed above the clamping table, usually the outer wall of the shell is placed between the inner clamping plate and the outer clamping plate. At this time, the driver is started to inject pressure into the confluence cavity. Due to the principle of the communicating vessel, during the pressure injection process, both the inner pressure rod and the outer pressure rod can adaptively output outward, thereby driving the inner clamping plate and the outer clamping plate to clamp the helmet shell stably and evenly respectively;

[0019] After the clamping component above the clamping table evenly clamps the shell, at this time, select the pressure item according to the test needs, including vertical heavy pressure from top to bottom and impact at multiple side positions. After determining the pressure test item by controlling the regulating valve or the flow dividing valve, start the driver to apply pressure to the shell; during the pressure application process, the central controller receives and records the induced pressure change data of the pressure sensors at different points, and draws a pressure data curve through the built-in operation module.

[0020] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 is the front view structure diagram of the helmet shell strength testing device of the present invention;

[0023] Figure 2 is Figure 1 the partial display diagram of part A in;

[0024] Figure 3 is the rear view structure diagram of the helmet shell strength testing device of the present invention;

[0025] Figure 4 is Figure 1 the top view of;

[0026] Figure 5 is Figure 4 the structural schematic diagram of section B-B in;

[0027] Figure 6 is Figure 5 a partial view showing part D in

[0028] Figure 7 is Figure 5 a partial view showing part E in

[0029] Figure 8 is Figure 5 a schematic structural view of the cross-section F-F in

[0030] Figure 9 is Figure 8 a partial view showing part G in

[0031] Figure 10 is Figure 4 a schematic structural view of the cross-section C-C in

[0032] Figure 11 is Figure 10 a partial view showing part H in

[0033] In the accompanying drawings, the list of components represented by each reference numeral is as follows:

[0034] 1. Support base; 2. Working plate; 3. Clamping table; 4. Driver; 5. Support rod; 201. Main pressure cylinder; 202. Shunt; 203. Regulator; 204. Auxiliary pressure cylinder; 205. Working pipe; 206. Main pressure pipe; 207. Control valve; 2011. Main pressure rod; 2012. Main pressure plate; 208. Swing pressure arm; 2081. Swing hammer; 2082. Hinge shaft; 2083. Driving gear; 2041. Auxiliary pressure rod; 2042. Connecting rod; 2043. Driving rack; 209. Driving chute; 2021. Shunt valve; 2084. Driven gear; 210. Linkage chamber; 211. Adjusting rod; 212. Linkage gear; 213. Driven plate; 214. Return spring; 2031. Driving plate; 301. Clamping groove; 302. Inner clamping plate; 303. Outer clamping plate; 304. Connecting spring; 305. Confluence chamber; 3051. Inner cavity channel; 3052. Outer cavity channel; 3053. Inner pressure rod; 3054. Outer pressure rod; 306. Auxiliary pressure pipe; 307. Pressure sensor; 6. Shut-off valve; 7. Central controller. Detailed implementation mode

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", etc. indicating the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present invention.

[0037] Please refer to Figures 1 - 11 As shown, the present invention is a helmet shell strength testing device, including a support base 1, a working plate 2, a clamping table 3 and a driver 4. The driver 4 is an electric hydraulic cylinder structure and is arranged between the working plate 2 and the support base 1; a plurality of support rods 5 are bolted and fixed between the support base 1 and the working plate 2, and the clamping table 3 is arranged between the plurality of support rods 5 and is bolted and fixed to the support rods 5; this technical solution simulates the bearing capacity of the shell of the helmet under compression and impact by the working plate 2, specifically testing the diffusion degree of the point force on the helmet shell after compression and impact.

[0038] Preferably, a main pressure cylinder 201, a diverter 202 and a plurality of regulators 203 are bolted and fixed on the upper surface of the working plate 2. The diverter 202 is a right-angle joint structure, and auxiliary pressure cylinders 204 are bolted and fixed at both opposite ends thereof; a working pipe 205 is flange-connected to one side surface of the diverter 202, and one end of the working pipe 205 penetrates through the working plate 2 and extends to the bottom of the driver 4; a main pressure pipe 206 is flange-connected between the top end of the working pipe 205 and the main pressure cylinder 201, and a regulating valve 207 is installed at the connection between the main pressure pipe 206 and the working pipe 205; the regulating valve 207 is a single-pass valve structure, that is, within the same working time, only one of the main pressure pipe 206 and the working pipe 205 is connected to the driver 4;

[0039] A main pressure rod 2011 is slidably engaged inside the main pressure cylinder 201, and a piston structure is formed between the two; a main pressure plate 2012 is welded and fixed to the lower end of the main pressure rod 2011, and the main pressure plate 2012 is arranged directly above the clamping table 3; the piston structure formed by the main pressure cylinder 201 and the main pressure rod 2011 directly acts above the helmet shell for simulating pressure application, and the pressure is controlled by controlling the output of the driver 4; a plurality of swing pressure arms 208 are hinged to the peripheral side surface of the working plate 2, a swing hammer 2081 is welded and fixed to one end of the swing pressure arm 208, and the swing hammer 2081 is arranged below the working plate 2;

[0040] A driving gear 2083 is welded and fixed to the side surface of the hinge shaft 2082 of the swing pressure arm 208; an auxiliary pressure rod 2041 is slidably engaged inside the auxiliary pressure cylinder 204, and a driving gear rod 2043 is welded and fixed to one side of the auxiliary pressure rod 2041 through a connecting rod 2042; a plurality of driving grooves 209 are opened inside the working plate 2, wherein the driving gear rod 2043 slides and extends to the inside of the driving groove 209 through the connecting rod 2042, and the tooth groove of the driving gear rod 2043 meshes with the driving gear 2083; a diverter valve 2021 is installed on the surface of the diverter 202, The diverter valve 2021 is a three-way valve, and the two auxiliary pressure cylinders 204 and the working pipe 205 are connected through the diverter valve 2021, that is, the three can achieve two-way and three-way communication through the diverter valve 2021; combined with the above structure, it should be noted that, in the actual working structure, the number of swing pressure arms 208 includes at least four groups, and the corresponding number of driving gear rods 2043 includes two groups, that is, in actual work, the diverter 202 only needs to control two adjacent groups of swing pressure arms 208 to achieve control of all swing pressure arms 208.

[0041] Preferably, a driven gear 2084 is welded to one end of the hinge shaft 2082; a linkage chamber 210 is also provided inside the working plate 2, and the linkage chamber 210 is arranged between two adjacent driven gears 2084; a plurality of adjusting rods 211 are slidably engaged on the upper surface of the working plate 2, and a linkage gear 212 is rotatably engaged at the lower end of the adjusting rod 211, wherein the linkage gear 212 is arranged inside the linkage chamber 210, and when the adjusting rod 211 is pressed down, two adjacent driven gears 2084 are meshed and linked through the linkage gear 212; based on the above principle, the number of linkage gears 212 also includes two groups, i.e., they are arranged between the hinge shaft 2082 with the driving gear 2083 and one of the adjacent hinge shafts 2082.

[0042] Preferably, a driven plate 213 is welded and fixed to the upper end of the adjusting rod 211, and a return spring 214 is installed between the driven plate 213 and the working plate 2; a driving plate 2031 is welded and fixed to one surface of the regulator 203, and the driving plate 2031 is arranged directly above the driven plate 213; wherein the driving plate 2031 is an electromagnet, and the driven plate 213 is a permanent magnet, and when the driving plate 2031 is energized, the two magnetically repel each other, that is, when the driving plate 2031 is energized, it uses the magnetic repulsion force to push the driven plate 213 down, thereby making the linkage gear 212 mesh with the driven gear 2084; wherein in order to achieve flexible engagement, the linkage gear 212 and the driven gear 2084 are both bevel gear structures; based on the above principles, in actual work, the operator can change the pressure item of the test by controlling the regulating valve 207, and change the number and direction of the impacted points by controlling the diverter valve 2021.

[0043] Preferably, a plurality of clamping grooves 301 are formed on the upper surface of the clamping table 3. An inner clamping plate 302 and an outer clamping plate 303 are slidably engaged inside the clamping groove 301. The two form a clamping unit, and there is a gap between the inner clamping plate 302 and the outer clamping plate 303; a plurality of clamping units are symmetrically distributed in pairs; connecting springs 304 are installed between the opposite ends of the clamping groove 301 and the inner clamping plate 302 and the outer clamping plate 303 respectively; a confluence cavity 305 is formed inside the clamping table 3. A plurality of inner cavity channels 3051 and a plurality of outer cavity channels 3052 are formed on the circumferential side surface of the confluence cavity 305. An inner pressure rod 3053 is slidably engaged inside the inner cavity channel 3051, and the output end of the inner pressure rod 3053 is fixedly welded to the inner clamping plate 302; an outer pressure rod 3054 is slidably engaged inside the outer cavity channel 3052, and the output end of the outer pressure rod 3054 is fixedly welded to the outer clamping plate 303; a secondary pressure pipe 306 is flange-connected to the lower end of the confluence cavity 305, and one end of the secondary pressure pipe 306 extends and communicates with the bottom of the driver 4; a communicating vessel structure based on a piston structure is formed between the inner cavity channel 3051 and the outer cavity channel 3052 through the confluence cavity 305; pressure sensors 307 are embedded on the outer side surface of the inner clamping plate 302 and the inner side surface of the outer clamping plate 303;

[0044] It should be supplemented and described that an infrared receiver is installed on the lower surface of the working plate 2, and an infrared emitter is installed on the upper surface of the clamping table 3. That is, when a housing to be detected is placed above the clamping table 3, its own projection covers the infrared emitter, thereby transmitting a corresponding light and shadow signal to the infrared receiver, and then controlling the start of the clamping assembly; combined with the foregoing structure, in the actual working process, when the housing to be detected is placed above the clamping table 3, the outer wall of the housing is usually placed between the inner clamping plate 302 and the outer clamping plate 303. At this time, the driver 4 is started to inject pressure into the confluence cavity 305. Due to the principle of the communicating vessel, during the pressure injection process, both the inner pressure rod 3053 and the outer pressure rod 3054 can adaptively output outward, thereby driving the inner clamping plate 302 and the outer clamping plate 303 to clamp the helmet housing stably and evenly.

[0045] Preferably, shut-off valves 6 are installed at the connection parts of both the working pipe 205 and the secondary pressure pipe 306 with the driver 4; a central controller 7 is also installed on the upper surface of the support base 1. Among them, the shut-off valve 6, the regulating valve 207 and the flow dividing valve 2021 are all solenoid valves, and are all electrically connected to the central controller 7 and controlled by it; the drive motor and the drive plate 2031 of the driver 4 are both electrically connected to the central controller 7 and controlled by it.

[0046] Preferably, an operation module and a digital-to-analog conversion module are provided inside the central controller 7. The digital-to-analog conversion module receives the pressure data sensed by the pressure sensor 307 and converts it into digital information and sends it to the operation module; the central controller 7 also includes a storage module and a display module, both of which receive the data calculated by the operation module and store and display it respectively.

[0047] Example:

[0048] The specific test method of the helmet shell strength test equipment in this embodiment is as follows: After the clamping component above the clamping table 3 evenly clamps the shell, at this time, select the pressure items according to the test requirements, including vertical heavy pressure from top to bottom and impacts at multiple points on the side. After determining the pressure test items by controlling the regulating valve 207 or the flow dividing valve 2021, start the driver 4 to apply pressure to the shell; during the pressure application process, the central controller 7 receives and records the induced pressure change data of the pressure sensors 307 at different points, and draws a pressure data curve through the built-in operation module.

[0049] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0050] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not elaborate on all details, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. Helmet shell strength testing equipment, including a support base, a working plate, a clamping table and a driver, characterized in that: The driver is an electric hydraulic cylinder structure, which is arranged between the working plate and the supporting base; a plurality of supporting rods are bolted and fixed between the supporting base and the working plate, and the clamping platform is arranged between the plurality of supporting rods and bolted and fixed with the supporting rods; The upper surface of the working plate is bolted and fixed with a main pressure cylinder, a flow divider and several regulators, wherein the flow divider is a right-angle joint structure, and the two opposite ends thereof are bolted and fixed with auxiliary pressure cylinders; a side flange of the flow divider is connected with a working pipe, and one end of the working pipe passes through the working plate and extends to the bottom of the driver; a main pressure pipe is flange-connected between the working pipe and the top of the main pressure cylinder, and a regulating valve is installed at the connection between the main pressure pipe and the working pipe; The main pressure rod is slidably engaged inside the main pressure cylinder, and a piston structure is formed between the two. A main pressure plate is welded and fixed to the lower end of the main pressure rod, and the main pressure plate is arranged directly above the clamping platform. A plurality of swing pressure arms are hinged on the peripheral side surface of the working plate, and a pendulum is welded and fixed to one end of the swing pressure arm, and the pendulum is arranged below the working plate. A driving gear is welded and fixed to the side surface of the hinge shaft of the swing pressure arm; an auxiliary pressure rod is slidably engaged with the inside of the auxiliary pressure cylinder, and a driving gear rod is welded and fixed to one side of the auxiliary pressure rod through a connecting rod; a plurality of driving grooves are opened inside the working plate, wherein the driving gear rod slides and extends into the driving groove through the connecting rod, and the tooth groove of the driving gear rod is meshed with the driving gear; a diverter valve is installed on the surface of the diverter, wherein the diverter valve is a three-way valve, and the two auxiliary pressure cylinders and the working pipe are connected through the diverter valve.

2. The helmet shell strength testing equipment according to claim 1, characterized in that: A driven gear is welded to one end of the hinge shaft; a linkage chamber is also provided inside the working plate, and the linkage chamber is arranged between two adjacent driven gears; a plurality of adjusting rods are slidably engaged with the upper surface of the working plate, and a linkage gear is rotatably engaged with the lower end of the adjusting rod, wherein the linkage gear is arranged inside the linkage chamber, and when the adjusting rod is pressed down, the two adjacent driven gears are meshed and linked through the linkage gear.

3. The helmet shell strength testing device according to claim 2, characterized in that: A driven plate is welded and fixed to the upper end of the adjusting rod, and a return spring is installed between the driven plate and the working plate; a driving plate is welded and fixed to one surface of the adjuster, and the driving plate is arranged directly above the driven plate; wherein the driving plate is an electromagnet, the driven plate is a permanent magnet, and when the driving plate is energized, the two repel each other magnetically.

4. The helmet shell strength testing device according to claim 3, characterized in that: The upper surface of the clamping platform is provided with a plurality of clamping grooves, and an inner clamping plate and an outer clamping plate are slidably engaged inside the clamping grooves, and the two constitute a clamping unit, and there is a gap between the inner clamping plate and the outer clamping plate; a plurality of the clamping units are symmetrically distributed in pairs; connecting springs are respectively installed between the inner clamping plate and the outer clamping plate at the opposite ends of the clamping grooves; a confluence cavity is provided inside the clamping platform, and a plurality of inner cavities and a plurality of outer cavities are provided on the side surfaces of the confluence cavity, an inner pressure rod is slidably engaged inside the inner cavity, and the output end of the inner pressure rod is welded and fixed to the inner clamping plate; an outer pressure rod is slidably engaged inside the outer cavity, and the output end of the outer pressure rod is welded and fixed to the outer clamping plate; an auxiliary pressure pipe is connected to the flange at the lower end of the confluence cavity, and one end of the auxiliary pressure pipe extends to connect to the bottom of the driver.

5. The helmet shell strength testing device according to claim 4, characterized in that: A communicating vessel structure based on a piston structure is formed between the inner cavity and the outer cavity through a confluence cavity; pressure sensors are embedded on the outer side surface of the inner clamping plate and the inner side surface of the outer clamping plate.

6. The helmet shell strength testing device according to claim 5, characterized in that: Both the working tube and the auxiliary pressure tube are equipped with shut-off valves at the connection with the driver; a central controller is also installed on the upper surface of the support base, wherein the shut-off valve, regulating valve and diverter valve are all solenoid valves, and are electrically connected to and controlled by the central controller; the drive motor and drive plate of the driver are electrically connected to and controlled by the central controller.

7. The helmet shell strength testing device according to claim 6, characterized in that: The central controller is internally provided with a calculation module and a digital-to-analog conversion module, wherein the digital-to-analog conversion module receives the pressure data sensed by the pressure sensor and converts it into digital information and sends it to the calculation module; the central controller also includes a storage module and a display module, both of which receive the data calculated by the calculation module and store and display it respectively.

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