Clamp tool and drop test device

Abstract

The utility model relates to the technical field of vehicle hydrogen cylinder type tests, in particular to a drop test device for a vehicle hydrogen cylinder and a combined valve accessory (a temperature-driven safety pressure relief device, a Thermal-active pressure release device, which is abbreviated as TPRD in English). In order to achieve the purpose, the drop test device comprises a supporting base, a stand column is arranged on the supporting base, the stand column is connected with a clamp tool, the clamp tool comprises a clamping base and a clamping seat arranged on the clamping base, the clamping seat comprises an inner concave plate and a rubber plate, and the rubber plate is arranged on the inner concave plate. The rubber plate can be hidden in the inner concave plate when not in use, and the rubber plate can cover the surface of the inner concave plate when in use. According to the utility model, different gas cylinders and products can be conveniently clamped, and the gas cylinder and drop test is ensured to be accurate so as to meet the type test requirements in the standard.

Description

Technical Field

[0001] The utility model relates to the technical field of type test of vehicle hydrogen cylinders, and in particular to a drop test device for a vehicle hydrogen cylinder and a combined valve accessory (a thermally-activated pressure relief device, hereinafter referred to as TPRD). Background Art

[0002] With the depletion of traditional energy sources such as oil, coal and natural gas, hydrogen energy is gradually becoming a new way for sustainable development of resources and environment in countries around the world. In the field of hydrogen fuel cell vehicles, automotive compressed hydrogen aluminum liner carbon fiber fully wrapped gas cylinders (i.e. Type III bottles) and automotive compressed hydrogen plastic liner carbon fiber fully wrapped gas cylinders (i.e. Type IV bottles) are currently widely used automotive hydrogen storage bottles due to their advantages of high safety, light weight, and high mass hydrogen storage density.

[0003] At present, the current standards for high-pressure hydrogen storage cylinders for vehicles in my country are GB / T 35544-2017 "Automotive Compressed Hydrogen Aluminum Liner Carbon Fiber Fully Wrapped Cylinders" (hereinafter referred to as "Type III Cylinder Standard") and GB / T 42612-2023 "Automotive Compressed Hydrogen Plastic Liner Carbon Fiber Fully Wrapped Cylinders" (hereinafter referred to as "Type IV Cylinder Standard"). In the standards for Type III and Type IV cylinders, type tests require hydrogen storage cylinders to be horizontal, vertical, and dropped at a 45° angle to the vertical. When falling horizontally, the lower surface of the gas cylinder should be 1.8 meters away from the falling surface; when falling vertically, the falling height should make the gas cylinder have a potential energy greater than or equal to 488 joules, and at the same time ensure that the lower end of the gas cylinder is less than or equal to 1.8 meters from the falling surface, and appropriate methods should be used to prevent the gas cylinder from tipping over during free fall; when falling at 45°, if the lower end of the gas cylinder is less than 0.6 meters from the falling surface, the falling angle should be changed to ensure the minimum height of 0.6 meters, and at the same time ensure that the center of gravity of the gas cylinder is 1.8 meters from the falling surface.

[0004] In addition, the type test requires that TPRD should also undergo a drop test, which is carried out in accordance with the standard GB / T 42536-2023 "Combination valve for high-pressure hydrogen storage cylinders for vehicles". The standard stipulates that at room temperature, TPRD should be dropped freely from a height of 2 meters onto a smooth ground in 6 directions (positive and negative directions of three orthogonal axes).

[0005] In the process of performing the drop test of vehicle hydrogen storage cylinders and TPRD, the following problems exist when using the commonly used drop test bench:

[0006] First, when the gas cylinder is subjected to a vertical drop test, it will fall over after hitting the ground due to its own weight, which will damage the gas cylinder itself and affect the subsequent test results.

[0007] Second, the height of the gas cylinder and TPRD before falling is not accurately measured. Due to the different diameters and lengths of various gas cylinders, the actual height of their lower surface (or lowest end) from the falling surface may not be the height set by the falling device, and the actual height may not even meet the standard requirements, making the drop test results inaccurate.

[0008] Third, it is inconvenient to replace the gas cylinder and TPRD fixture. Due to the great differences in shape and weight of the gas cylinder and the combination valve, there is currently no universal and easily replaceable fixture that can stably clamp these two samples. Summary of the invention

[0009] In order to solve the above technical problems, the utility model provides a fixture and a drop test device, which are convenient for clamping different gas cylinders and TPRD products, ensuring that the drop test of gas cylinders and TPRD is accurate to meet the type test requirements in the standard.

[0010] To achieve the above-mentioned purpose, the utility model proposes a clamp tooling, including a clamping base and a clamping seat arranged on the clamping base, the clamping seat includes an inner concave plate and a rubber plate, the rubber plate can be hidden inside the inner concave plate when not in use, and the rubber plate can cover the surface of the inner concave plate when in use.

[0011] Preferably, a plurality of slide grooves are arranged on the inner concave plate, and slide plates corresponding to the slide grooves are arranged on the rubber plate.

[0012] Preferably, the rubber plate is a convex plate, and the clamping surface formed when the rubber plate covers the surface of the inner concave plate is a plane.

[0013] Preferably, the inner concave plate is a hollow plate, a support plate is arranged inside the inner concave plate, and a through groove for the rubber plate to pass through is arranged below the support plate.

[0014] Preferably, a motor is provided on the clamping seat, an output end of the motor is inside the inner concave plate, a traction rope is connected to the motor, a traction hole is provided on the upper surface of the inner concave plate, and the traction rope moves in the traction hole.

[0015] To achieve the above-mentioned purpose, the utility model also proposes a drop test device, which uses the fixture tooling described in any of the above items, and a column is arranged on the support base, and the fixture tooling is connected to the column.

[0016] Preferably, a column-type linear guide is provided on the support base, a slider with an encoder is installed on the slider, and a horizontal laser source is installed on the slider.

[0017] Preferably, the upright column is symmetrically provided with a rotating and lifting mechanism, the rotating and lifting mechanisms on both sides are connected by a cross bar, the rotating and lifting mechanism is provided with a clamping rod, and the clamping tooling is provided on the clamping rod.

[0018] Preferably, a cylindrical soft rubber pad is provided on the support base.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] This type of vehicle hydrogen cylinder and TPRD drop test device used for type testing can firstly be used to clamp different types of samples after quick and convenient assembly by replacing the fixture, which greatly improves the versatility of the drop device. Secondly, the actual drop height of the sample can be obtained, so that it is convenient to adjust the lifting mechanism to meet the standard requirements and improve the accuracy of the drop test. Finally, it can prevent the vertical cylinder from tipping over, avoid secondary damage to the cylinder, and ensure that the subsequent tests are not affected.

[0021] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural three-view drawing of the fixture for TPRD drop test of the utility model.

[0023] Figure 2 It is a structural three-view drawing of the clamp for gas cylinder drop test of the utility model.

[0024] Figure 3 It is a schematic diagram of a TPRD drop test performed using the utility model.

[0025] Figure 4 It is a schematic diagram of a gas cylinder horizontal drop test performed using the utility model.

[0026] Figure 5 It is a schematic diagram of a gas cylinder vertical drop test conducted using the utility model.

[0027] Figure 6 The utility model is a structural schematic diagram in which a rubber plate of a fixture tooling covers the surface of an inner concave plate.

[0028] Figure 7 The utility model is a structural schematic diagram in which the rubber plate of the fixture tooling is hidden inside the inner concave plate.

[0029] Figure 8 It is a structural schematic diagram of another embodiment of the utility model in which the rubber plate of the fixture is hidden inside the inner concave plate.

[0030] Fig. 9 It is a structural schematic diagram of the support plate.

[0031] Fig.10 It is a schematic diagram of the side view structure of the inner concave plate used to connect the rubber plate part.

[0032] in:

[0033] 101-clamping plate; 102-soft rubber pad; 201-concave clamping plate; 1-column; 2-rotation and lifting mechanism; 3-cross bar; 4-support base; 5-horizontal laser source; 6-clamping rod; 7-clamping base; 8-clamping plate; 9-soft rubber pad; 10-combination valve; 11-linear guide; 12-concave clamping plate; 13-gas cylinder; 14-cylindrical soft rubber pad; 15-concave plate; 151-slide; 152-support plate; 153-through groove; 16-rubber plate; 161-slide plate; 17-motor; 18-traction rope DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model. Embodiment 1

[0035] Compared with the commonly used drop test equipment, the automotive hydrogen cylinder and TPRD drop test equipment used for type testing have three major improvements. First, there are two sets of test sample fixtures based on the same base, one set for the cylinder drop test and the other for the TPRD drop test; second, the actual height measurement mechanism of the sample, which consists of a horizontal laser and a linear guide with an encoder; third, the vertical drop anti-dumping protection device for the cylinder, which consists of a cylindrical soft rubber pad.

[0036] See also Figure 1 and Figure 2 The fixture used for the gas cylinder drop test is composed of a concave clamping plate 201, which is fixed to the clamping base of the drop device by a number of easily detachable bolts. Although the gas cylinders have different diameters and lengths, their cross-sections are uniformly regular circles. At the same time, considering the weight of the gas cylinder, the design of the concave clamping plate 201 is adopted, which can not only stably clamp the test gas cylinder, but also be applicable to various types of gas cylinders, and has good stability and versatility.

[0037] See also Figure 1 and Figure 2The fixture used for the TPRD drop test consists of a clamping plate 101 with a soft rubber pad 102 of a certain thickness. The rubber pad 102 is fixed to the clamping plate 101 by a number of bolts, and the clamping plate 101 is also fixed to the clamping base of the drop device by a number of bolts. According to the standard, the TPRD drop test must be tested in six directions (positive and negative directions of three orthogonal axes). Since the combination valve and its accessories are mostly irregular in shape, it is difficult for the rigid clamping plate to fit six surfaces at the same time. Therefore, a soft rubber pad is used to fit the irregular surface, which not only increases the friction to prevent accidental falling, but also avoids damage to its structure during clamping, resulting in inaccurate results of its drop test.

[0038] See also Figure 1 and Figure 2 At the same time, because the bottom surface shape and size of the clamping plate 101 are consistent with the bottom surface of the concave clamping plate 201, and the bolt fixing positions and numbers are also consistent, the two are adapted to the same clamping base. By removing the clamping plate or several bolts between the concave clamping plate and the clamping base, the two clamps can be replaced conveniently and quickly, which is convenient for adapting to the drop test requirements of different samples.

[0039] See also Figure 3-Figure 5 , a device for measuring the actual height of the sample, consisting of a horizontal laser and a column-type linear guide. The column-type linear guide 11 is vertically mounted on the support base 4, a slider is mounted on the guide, and a horizontal laser source 5 is provided on the slider for aligning the lowest end of the test sample. The slider is provided with an encoder, which can accurately reflect the distance between the slider and the bottom end of the guide, which is the actual height of the lowest end of the current test sample from the falling surface.

[0040] See also Figure 3-Figure 5 , an anti-dumping protection device for the vertical fall of a gas cylinder, is composed of a cylindrical soft rubber pad 14. When conducting a vertical drop test of a gas cylinder, after the gas cylinder 13 freely falls vertically, it cannot always maintain its vertical state when contacting the support base 4, but will dump in any direction. Since the gas cylinder itself has a large mass, dumping will cause secondary damage to it, making subsequent test results inaccurate. Therefore, a cylindrical soft rubber pad is placed directly below the vertical fall of the gas cylinder, and then the gas cylinder is released to fall freely. The cylindrical structure allows the gas cylinder to still contact the hard support base normally after the vertical free fall, which does not affect the drop test results, and only protects the gas cylinder from dumping from the side.

[0041] like Figure 1-5 As shown, the utility model provides a vehicle hydrogen cylinder and TPRD drop test device for type testing, which, in addition to the mechanisms contained in a commonly used drop test device, also includes a cylinder drop test fixture and a TPRD drop test fixture, a sample lowest end actual height measurement mechanism, and a cylinder vertical drop anti-dumping protection device.

[0042] like Figure 3-5 After installing the gas cylinder drop test fixture, place the gas cylinder between the two concave clamping plates 12. Driven by the air compressor, the clamping rod 6 pushes the two clamping bases 7 to move toward each other, so that the concave clamping plates clamp and fix the gas cylinder. Then, the rotating and lifting mechanism 2 lifts the gas cylinder to the test height, and the horizontal laser source 5 is moved to align the lowest end of the gas cylinder, so as to obtain the height of the lowest end of the gas cylinder from the support base 4. Then, the clamping device is released to allow the gas cylinder to fall freely, completing a drop test.

[0043] like Figure 3-5 After the clamping base 7 is reset, the fixing bolts on the concave clamping plate 12 are unscrewed to remove the concave clamping plate 12. Then the clamping plate 8 is installed on the clamping base 7, and the TPRD drop test can be carried out after tightening the same fixing bolts.

[0044] like Figure 3-5 , because the sizes of different types of samples are different during the actual drop test, even if the rotating and lifting mechanism 2 is lifted to the set height according to the standard requirements, the actual height of the lowest end of the sample from the drop surface will deviate from the set height. In order to improve the accuracy of the test, a column-type linear guide 11 is installed on the support base, and the slider on the guide is equipped with a precision encoder, and a horizontal laser source 5 is fixed on the slider. Use this horizontal laser source to align the lowest end of the sample. At this time, the height of the horizontal laser source from the support base obtained by the slider encoder is the actual height of the lowest end of the sample from the drop surface.

[0045] like Figure 3-5 When conducting a drop test on a gas cylinder in the vertical direction, first clamp the gas cylinder and then raise it to the required height, then rotate the rotating and lifting mechanism 2 to make the gas cylinder in a vertical state. Move the horizontal laser source 5 to align with the lowest end of the gas cylinder, obtain the actual height of the lowest end of the sample, and then adjust the rotating and lifting mechanism 2 to make the actual height meet the standard requirements. Place the cylindrical soft rubber pad 14 directly below the vertical gas cylinder. The diameter of this cylindrical soft rubber pad will be as large as possible from the diameter of the gas cylinder so that the gas cylinder will not touch the cylindrical soft rubber pad during free fall. Only when the gas cylinder begins to tip over in any direction will the cylindrical soft rubber pad provide support for the gas cylinder. At the same time, the soft rubber material can cushion the impact of the gas cylinder when it tips over to avoid secondary damage.

[0046] The utility model can firstly replace the fixture, so that the drop device can be used to clamp different types of samples after quick and convenient assembly, which greatly improves the versatility of the drop device. Secondly, the actual drop height of the sample can be obtained, so that it is convenient to adjust the lifting mechanism to meet the standard requirements and improve the accuracy of the drop test. Finally, it can prevent the vertical gas cylinder from tipping over, avoid secondary damage to the gas cylinder, and ensure that the subsequent tests are not affected. Embodiment 2

[0047] Since the clamping seat needs to be replaced frequently in Example 1, the clamping seat is improved so that the clamping seat on the clamping base 7 can be used for the type test of the vehicle hydrogen cylinder and TPRD drop test without disassembly and replacement. The other structures of the experimental device are the same as those in Example 1, except that the structure of the fixture is different. The fixture is installed on the clamping rod 6.

[0048] like Figure 6-7 , 9-10, the structure of the specific fixture is as follows, including a clamping base 7 and a clamping seat arranged on the clamping base 7, the clamping seat includes an inner concave plate 15 and a rubber plate 16, the rubber plate 16 can be hidden inside the inner concave plate 15 when not in use, and the rubber plate 16 can cover the surface of the inner concave plate 15 when in use. The rubber plate 16 itself has a certain elasticity and deformability, so that the TPRD will not be damaged by clamping, and it can also be better hidden in the inner concave plate 15.

[0049] The inner concave plate 15 is provided with a plurality of slide grooves 151, the number of which can be selected according to actual conditions, preferably 3. A slide plate 161 corresponding to the slide grooves 151 is provided on the rubber plate 16, and the slide plate 161 moves along the slide grooves 151 to better cover the inner concave plate 15.

[0050] The rubber plate 16 is a protruding plate, and the clamping surface formed when covering the surface of the inner concave plate 15 is a plane, so it is easier to clamp the TPRD. Even if the clamping surface of the rubber plate 16 is not completely flat, it does not affect the clamping. Relatively speaking, the TPRD itself is small and light.

[0051] The inner concave plate 15 is a hollow plate, and a support plate 152 is arranged inside the inner concave plate 15, so that the inner concave plate 15 is less likely to deform and has a longer service life. A through groove 153 for the rubber plate 16 to pass through is arranged below the support plate 152, so that the storage process of the rubber plate 16 is better.

[0052] A motor 17 is provided on the clamping seat, and the output end of the motor 17 is inside the inner concave plate 15. A traction rope 18 is connected to the motor 17, and a traction hole is provided on the upper surface of the inner concave plate 15, and the traction rope 18 moves in the traction hole. In order to prevent the traction rope 18 from being easily exposed, a traction hole or a corresponding pipe is also provided on the inner side wall of the inner concave plate 15 to prevent it from running around. In order to prevent the friction force of the rubber plate 16 from being too large and unable to be pulled by the traction rope 18, a small ball can be provided at the contact position of the rubber plate 16 during the actual traction process, so that it is not easy to get stuck.

[0053] In an optional embodiment, if Figure 8As shown, in order to allow the rubber sheet 16 to be retracted after covering the surface of the inner concave plate 15, an output shaft of a forward and reverse screw can be provided on the motor 17. The upper and lower ends of the output shaft are connected to the rubber sheet 16 through a traction rope, respectively. When rotating clockwise, the rubber sheet 16 enters the covering position from the hidden position, the upper traction rope is slowly wound in the upper output shaft, and the lower traction rope is slowly released from the lower output shaft, but the rubber sheet 16 is always kept straight, so that the clamping force is greater when clamping the TPRD. When rotating counterclockwise, the lower traction rope is wound and the upper traction rope is released.

[0054] Of course, the motor can also be a single screw in the same direction. The lower end of the rubber plate 16 does not use a traction rope, but uses a return spring to stretch it. When the upper end traction rope is released, the rubber plate 16 is slowly hidden.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A clamping tool, comprising a clamping base (7) and a clamping seat arranged on the clamping base (7), characterized in that: The clamping seat comprises an inner concave plate (15) and a rubber plate (16); the rubber plate (16) can be hidden inside the inner concave plate (15) when not in use, and the rubber plate (16) can cover the surface of the inner concave plate (15) when in use.

2. A fixture as claimed in claim 1, characterized in that: A plurality of slide grooves (151) are provided on the inner concave plate (15), and a slide plate (161) corresponding to the slide grooves (151) is provided on the rubber plate (16).

3. A fixture as claimed in claim 1, characterized in that: The rubber plate (16) is a convex plate, and the clamping surface formed when it covers the surface of the concave plate (15) is a flat surface.

4. A fixture as claimed in claim 1, characterized in that: The inner concave plate (15) is a hollow plate, a support plate (152) is provided inside the inner concave plate (15), and a through groove (153) for the rubber plate (16) to pass through is provided below the support plate (152).

5. A fixture as claimed in claim 1, characterized in that: A motor (17) is arranged on the clamping seat, the output end of the motor (17) is inside the inner concave plate (15), a traction rope (18) is connected to the motor (17), a traction hole is arranged on the upper surface of the inner concave plate (15), and the traction rope (18) moves in the traction hole.

6. A drop test device, characterized in that: The clamping tooling according to any one of claims 1 to 5 is used, further comprising a support base (4), a column (1) being arranged on the support base (4), and the clamping tooling being connected to the column (1).

7. A drop test device as claimed in claim 6, characterized in that: The support base (4) is provided with a column-type linear guide rail (11) mounted thereon, a slider with an encoder is mounted thereon, and a horizontal laser source (5) is mounted on the slider.

8. A drop test device as claimed in claim 6, characterized in that: The upright column (1) is symmetrically provided with a rotating and lifting mechanism (2), the rotating and lifting mechanisms (2) on both sides are connected via a crossbar (3), the rotating and lifting mechanism (2) is provided with a clamping rod (6), and the clamping tooling is provided on the clamping rod (6).

9. A drop test device as claimed in claim 6, characterized in that: A cylindrical soft rubber pad (14) is provided on the support base (4).

Images