Fuel cell system start-stop load change durability test device

Abstract

The present application relates to the technical field of fuel cell, in particular to a fuel cell system start-stop variable load endurance detection device, which comprises a test bench base, two groups of rotatable clamping rods and two groups of blocking mechanisms, two accommodating grooves for respectively accommodating the two groups of clamping rods are formed on the test bench base, the two wheels close to the front of the automobile are clamped on the right group of clamping rods, the two wheels close to the rear of the automobile are clamped on the left group of clamping rods, and the two groups of blocking mechanisms are respectively located on the right side of the two groups of clamping rods, the fuel cell system start-stop variable load endurance detection device blocks the wheels by setting blocking wheels, and limits the vehicle to avoid the vehicle running out of the test bench, when the power of the fuel cell increases, the distance between the left clamping wheel and the right clamping wheel can be increased to make the vehicle descend, correspondingly, the blocking wheel also descends to avoid the contact between the vehicle bottom and the blocking wheel, which can meet the variable load test of the fuel cell, limit and block the wheels, and avoid the vehicle from rushing out.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and more specifically to a fuel cell system start-stop and load-varying durability testing device. Background Technology

[0002] According to GB / T38914—2020, the evaluation method for the service life test of proton exchange membrane fuel cell stacks for vehicles, the fuel cell system will undergo various operating condition switching cycles during the service life test. Since the hydrogen ejector has low efficiency when operating at low power, the hydrogen pump will be frequently started and stopped under varying load conditions during these switching cycles. Assuming a stack life of 5000 hours and 200,000 cycles, with 40 cycles per hour and one cycle every 1.5 minutes, this can be matched with the varying load conditions of the fuel cell system service life test. If the expected stack life is longer, the hydrogen pump can be considered as a consumable component and replaced.

[0003] During start-stop tests of automobiles, due to the large number of tests and the varying efficiency of the fuel cell during testing to achieve variable load operation, and to accelerate the number of tests while the vehicle is in motion, intermittent braking is required when the battery stops working to speed up the vehicle's cessation of operation. However, during intermittent braking, there is a risk that the vehicle will run off the test bench. If a device is installed to restrict the wheels and prevent the vehicle from running off the test bench, it would be necessary to design a device that can meet the requirements of variable load testing of fuel cells while also restricting and blocking the wheels to prevent the vehicle from running off the test bench. However, since this is a variable load test, the distance between the left and right locking wheels needs to be increased when the vehicle accelerates, which will inevitably cause a change in the vehicle's position, causing the vehicle to descend and collide with the blocking device. Therefore, it is necessary to design a device that can meet the requirements of variable load testing of fuel cells while also restricting and blocking the wheels to prevent the vehicle from running off the test bench. Summary of the Invention

[0004] To address the aforementioned technical shortcomings, the purpose of this invention is to provide a fuel cell system start-stop load variation durability testing device. This device is designed to meet the requirements of fuel cell load variation testing while also restricting and blocking the wheels to prevent the vehicle from running off course.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The present invention provides a fuel cell system start-stop load change durability testing device, including a test bench base, two sets of rotatable clamping rollers and two sets of blocking mechanisms. The test bench base is provided with two receiving slots for accommodating the two sets of clamping rollers respectively. The two wheels of the vehicle near the front are clamped in the set of clamping rollers on the right side, and the two wheels of the vehicle near the rear are clamped in the set of clamping rollers on the left side. The two sets of blocking mechanisms are located on the right side of the two sets of clamping rollers respectively. Each set of blocking mechanisms includes two, and the four blocking mechanisms are used to block the four wheels respectively. The blocking mechanisms are detachably installed on the test bench base.

[0006] Preferably, each set of rollers includes a left roller and a right roller. The spacing adjustment mechanism is used to adjust the spacing between the left roller and the right roller. The spacing adjustment mechanism includes an adjustment seat 1 for rotating the left roller and an adjustment seat 2 for rotating the right roller. When the spacing adjustment mechanism is adjusting, the adjustment seat 1 and the adjustment seat 2 move closer to each other or further away from each other.

[0007] Preferably, a cover plate one is provided on the side of the left chuck wheel away from the right chuck wheel, and a cover plate two is provided on the side of the right chuck wheel away from the left chuck wheel. Cover plate one is fixedly installed on adjustment seat one, and cover plate two is fixedly installed on adjustment seat two. The bottom of both cover plate one and cover plate two are in contact with the top of the test bench base.

[0008] Preferably, the blocking mechanism includes a push block, a sliding column, a guide slide, a vertical slide plate, and a stop wheel. The guide slide is fixedly installed on the top of the test bench base. The vertical slide plate is vertically slidable and installed on the guide slide. The stop wheel is rotatably installed on the end of the vertical slide plate near the wheel. The sliding column is fixedly installed on the vertical slide plate. The push block is fixedly installed on the cover plate two. The inclined surface of the push block contacts the sliding column. When the vehicle speed increases, the distance between the left and right chucks increases, causing the cover plate two to push outward, and both the wheel and the stop wheel descend.

[0009] Preferably, the spacing adjustment mechanism further includes a bidirectional pushing mechanism, a horizontally sliding base one and a base two, with two left chucks mounted on base one and two right chucks mounted on base two. The bidirectional pushing mechanism is used to push base one and base two to both sides.

[0010] Preferably, the bidirectional pushing mechanism includes an electro-hydraulic push rod and two hinged rods. One end of one hinged rod is hinged to a base, and one end of the other hinged rod is hinged to a base. The other ends of both hinged rods are hinged to the output end of the electro-hydraulic push rod.

[0011] Preferably, both the bottom of the first adjusting seat and the second adjusting seat are provided with a sliding seat, and the ground is provided with a slide rail that is slidably connected to the sliding seat.

[0012] Preferably, a linear bearing that is slidably connected to the guide slide is fixedly installed on the vertical slide plate.

[0013] Preferably, the vertical slide plate is S-shaped and the top of the vertical slide plate is provided with a swivel that is rotatably connected to the stop wheel.

[0014] The beneficial effects of this invention are as follows: This fuel cell system start-stop variable load durability testing device can limit the vehicle by setting up a stop wheel to block the wheels and prevent the vehicle from running off the test bench. When the fuel cell power increases, the distance between the left and right stop wheels can be increased to lower the vehicle. Correspondingly, the stop wheel also lowers to prevent the bottom of the vehicle from contacting the stop wheel. This achieves the goal of meeting the fuel cell variable load test requirements while also limiting and blocking the wheels to prevent the vehicle from running off the test bench. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a three-dimensional structural diagram of the test bench base.

[0018] Figure 3 This is a three-dimensional structural diagram of the present invention with the test bench base removed.

[0019] Figure 4 for Figure 3 The main view.

[0020] Figure 5 for Figure 1 A magnified view of part A.

[0021] Figure 6 This is a three-dimensional exploded view of the spacing adjustment mechanism.

[0022] Figure 7 for Figure 3 A magnified view of section B.

[0023] Explanation of reference numerals in the attached drawings: 1-Test bench base; 1a-Receiving groove; 2-Wheel; 3-Blocking mechanism; 3a-Push block; 3b-Sliding column; 3c-Guide slide seat; 3d-Vertical slide plate; 3e-Stop wheel; 4-Clamping roller; 4a-Left clamping roller; 4b-Right clamping roller; 5-Gap adjustment mechanism; 5a-Adjustment seat one; 5b-Adjustment seat two; 5c-Electro-hydraulic push rod; 5d-Hinged rod; 5e-Base one; 5f-Base two; 6-Cover plate one; 7-Cover plate two. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example: The present invention provides a fuel cell system start-stop load change durability testing device, as shown in Title 1-3, including a test bench base 1, two sets of rotatable clamping rollers 4 and two sets of blocking mechanisms 3. The test bench base 1 is provided with two receiving slots 1a for respectively accommodating the two sets of clamping rollers 4. The two wheels 2 of the car near the front are clamped in the set of clamping rollers 4 on the right side, and the two wheels 2 of the car near the rear are clamped in the set of clamping rollers 4 on the left side. The two sets of blocking mechanisms 3 are respectively located on the right side of the two sets of clamping rollers 4.

[0026] Each set of blocking mechanisms 3 includes two, and the four blocking mechanisms 3 are used to block the four wheels 2 respectively. The blocking mechanisms 3 are detachably installed on the test bench base 1.

[0027] like Figure 3 and Figure 4 As shown, each set of clamping rollers 4 includes a left clamping roller 4a and a right clamping roller 4b. The spacing adjustment mechanism 5 is used to adjust the spacing between the left clamping roller 4a and the right clamping roller 4b. The spacing adjustment mechanism 5 includes an adjustment seat 1 5a for rotatably connecting the left clamping roller 4a and an adjustment seat 2 5b for rotatably connecting the right clamping roller 4b. When the spacing adjustment mechanism 5 is adjusting, the adjustment seat 1 5a and the adjustment seat 2 5b move closer to each other or further away from each other, thereby adjusting the spacing between the left clamping roller 4a and the right clamping roller 4b. When the fuel cell power increases, that is, the load increases, the vehicle speed will increase. At this time, the left clamping roller 4a and the right clamping roller 4b will move further away from each other, so that the wheel 2 is inserted deeper into the left clamping roller 4a and the right clamping roller 4b, preventing the wheel 2 from running out.

[0028] like Figure 4 As shown, a cover plate 6 is provided on the side of the left chuck 4a away from the right chuck 4b, and a cover plate 7 is provided on the side of the right chuck 4b away from the left chuck 4a. Cover plate 6 is fixedly installed on adjusting seat 5a, and cover plate 7 is fixedly installed on adjusting seat 5b. This allows cover plate 6 and cover plate 7 to move together when adjusting seats 5a and 5b are adjusted in position, preventing cover plate 6 or cover plate 7 from obstructing the left chuck 4a or right chuck 4b. The bottoms of cover plate 6 and cover plate 7 are in contact with the top of the test bench base 1. By providing cover plate 6 and cover plate 7, when the vehicle is stuck on the left chuck 4a and right chuck 4b, the wheel 2 will not get stuck in the gap between the left chuck 4a and the groove wall of the receiving groove 1a.

[0029] During load changes, assuming a fuel cell life of 5000 hours and 200,000 tests, conducted at 40 tests per hour (one test every 1.5 minutes), a power outage is required for each test. After the power outage, the vehicle's wheels will rotate due to the lack of power drive, causing a buffering effect. To reduce the wheel stopping time, intermittent braking is used to reduce wheel speed. During braking, the brief wheel stop can cause the vehicle to slide off the left and right chock wheels 4a and 4b due to inertia. To prevent this, a blocking mechanism (blocking mechanism 3) is required. However, when the spacing adjustment mechanism 5 is adjusted, the height of wheel 2 will inevitably decrease. To prevent the blocking mechanism 3 from colliding with the vehicle body, therefore, [further details are needed]. Figure 1 and Figure 5 As shown, the blocking mechanism 3 includes a push block 3a, a sliding column 3b, a guide slide 3c, a vertical slide plate 3d, and a stop wheel 3e. The guide slide 3c is fixedly installed on the top of the test bench base 1. The vertical slide plate 3d is vertically slidably installed on the guide slide 3c. The stop wheel 3e is rotatably installed on one end of the vertical slide plate 3d near the wheel 2. The sliding column 3b is fixedly installed on the vertical slide plate 3d. The push block 3a is fixedly installed on the cover plate 7. The inclined surface of the push block 3a contacts the sliding column 3b.

[0030] During vehicle movement, the engagement of the left caliper 4a and the right caliper 4b provides sufficient obstruction. When the vehicle applies intermittent braking, the stop wheel 3e prevents it from slipping out of the space between the left caliper 4a and the right caliper 4b.

[0031] As the vehicle speed increases, the spacing adjustment mechanism 5 adjusts the spacing between the left and right chucks 4a and 4b via adjusting seats 5a and 5b. This increased spacing causes adjusting seat 5b to move cover plate 7, pushing it outwards. This outward movement of cover plate 7, in turn, pushes push block 3a outwards. Without the support of push block 3a, slide column 3b descends, causing the vertical slide plate 3d to slide vertically along guide seat 3c. In other words, the vertical slide plate 3d causes the stop wheel 3e to descend. Both wheel 2 and stop wheel 3e descend, preventing stop wheel 3e from contacting the vehicle floor and obstructing it. It is conceivable that a clearance is left between the top of guide seat 3c and the vehicle floor for the vehicle to descend, and for special vehicle models, stop wheel 3e can be embedded inside the test bench base 1.

[0032] like Figure 6As shown, the spacing adjustment mechanism 5 also includes a bidirectional pushing mechanism, a horizontally sliding base 5e, and a base 5f. Two left chucks 4a are mounted on the base 5e, and two right chucks 4b are mounted on the base 5f. The bidirectional pushing mechanism is used to push the bases 5e and 5f to both sides. By pushing the bases 5e and 5f with the bidirectional pushing mechanism, the spacing between the two sets of spacing adjustment mechanisms 5 is adjusted synchronously. The bidirectional pushing mechanism can be driven by two hydraulic rods or an electric push rod.

[0033] like Figure 6 and Figure 7 As shown, the bidirectional pushing mechanism includes an electro-hydraulic push rod 5c and two hinged rods 5d. One end of one hinged rod 5d is hinged to base 5e, and one end of the other hinged rod 5d is hinged to base 5f. The other ends of both hinged rods 5d are hinged to the output end of the electro-hydraulic push rod 5c. When the output end of the electro-hydraulic push rod 5c is pulled downward, the distance between the left locating roller 4a and the right locating roller 4b decreases; conversely, when the output end of the electro-hydraulic push rod 5c is pushed upward, the distance between the left locating roller 4a and the right locating roller 4b increases. This achieves the adjustment of the distance between the left locating roller 4a and the right locating roller 4b.

[0034] like Figure 6 As shown, both the bottom of the adjusting seat 5a and the adjusting seat 5b are equipped with sliding seats, and a slide rail is provided on the ground to slide along the sliding seats. The sliding connection between the sliding seats and the slide rail makes it easier to push the electro-hydraulic push rod 5c when adjusting the distance between the left and right chucks 4a and 4b.

[0035] like Figure 5 As shown, a linear bearing is fixedly mounted on the vertical sliding plate 3d and slidably connected to the guide slide 3c. The sliding connection between the linear bearing and the guide slide 3c allows the vertical sliding plate 3d to slide vertically.

[0036] like Figure 5 As shown, the vertical slide plate 3d is in an S-shaped curved state. The top of the vertical slide plate 3d is provided with a swivel that is rotatably connected to the wheel 3e, so that the vertical slide plate 3d extending into the side of the wheel is in a high position and the other side is in a low position, which reduces the overall height of the guide slide 3c.

[0037] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A fuel cell system start-stop load variation durability testing device, characterized in that, It includes a test bench base (1), two sets of rotatable clamping rods (4) and two sets of blocking mechanisms (3). The test bench base (1) has two receiving slots (1a) for accommodating the two sets of clamping rods (4) respectively. The two wheels (2) of the car near the front of the car are clamped in the set of clamping rods (4) on the right side, and the two wheels (2) of the car near the rear of the car are clamped in the set of clamping rods (4) on the left side. The two sets of blocking mechanisms (3) are located on the right side of the two sets of clamping rods (4) respectively. Each set of blocking mechanisms (3) includes two, and the four blocking mechanisms (3) are used to block the four wheels (2) respectively. The blocking mechanisms (3) are detachably installed on the test bench base (1). Each set of rollers (4) includes a left roller (4a) and a right roller (4b). The spacing adjustment mechanism (5) is used to adjust the spacing between the left roller (4a) and the right roller (4b). The spacing adjustment mechanism (5) includes an adjustment seat one (5a) for the left roller (4a) to rotate and an adjustment seat two (5b) for the right roller (4b) to rotate and connect. When the spacing adjustment mechanism (5) is adjusting, the adjustment seat one (5a) and the adjustment seat two (5b) move closer to each other or further away from each other. The blocking mechanism (3) includes a push block (3a), a slide column (3b), a guide slide (3c), a vertical slide plate (3d), and a stop wheel (3e). The guide slide (3c) is fixedly installed on the top of the test bench base (1). The vertical slide plate (3d) is vertically slidably installed on the guide slide (3c). The stop wheel (3e) is rotatably installed on one end of the vertical slide plate (3d) near the wheel (2). The slide column (3b) is fixedly installed on the vertical slide plate (3d). The push block (3a) is fixedly installed on the cover plate (7). The inclined surface of the push block (3a) is in contact with the slide column (3b). As the vehicle speed increases, the distance between the left chuck (4a) and the right chuck (4b) increases, causing the cover plate 2 (7) to be pushed outward, and both the wheel (2) and the stop wheel (3e) to descend.

2. The fuel cell system start-stop load variation durability testing device as described in claim 1, characterized in that, A cover plate 1 (6) is provided on the side of the left chuck (4a) away from the right chuck (4b), and a cover plate 2 (7) is provided on the side of the right chuck (4b) away from the left chuck (4a). The cover plate 1 (6) is fixedly installed on the adjustment seat 1 (5a), and the cover plate 2 (7) is fixedly installed on the adjustment seat 2 (5b). The bottoms of the cover plate 1 (6) and the cover plate 2 (7) are in contact with the top of the test bench base (1).

3. The fuel cell system start-stop load variation durability testing device as described in claim 1, characterized in that, The spacing adjustment mechanism (5) also includes a bidirectional pushing mechanism, a horizontally sliding base one (5e) and a base two (5f), two left chucks (4a) are mounted on the base one (5e), ​​and two right chucks (4b) are mounted on the base two (5f). The bidirectional pushing mechanism is used to push the base one (5e) and the base two (5f) to both sides.

4. The fuel cell system start-stop load variation durability testing device as described in claim 1, characterized in that, The bidirectional push mechanism includes an electro-hydraulic push rod (5c) and two hinged rods (5d). One end of one hinged rod (5d) is hinged to base one (5e), ​​and one end of the other hinged rod (5d) is hinged to base two (5f). The other ends of both hinged rods (5d) are hinged to the output end of the electro-hydraulic push rod (5c).

5. The fuel cell system start-stop load variation durability testing device as described in claim 3, characterized in that, Both the bottom of the first adjusting seat (5a) and the second adjusting seat (5b) are provided with sliding seats, and the ground is provided with a slide rail that is slidably connected to the sliding seats.

6. The fuel cell system start-stop load variation durability testing device as described in claim 1, characterized in that, A linear bearing is fixedly installed on the vertical slide plate (3d) and slidably connected to the guide slide (3c).

7. The fuel cell system start-stop load variation durability testing device as described in claim 1, characterized in that, The vertical slide (3d) is in an S-shaped curved state, and the top of the vertical slide (3d) is provided with a swivel that is rotatably connected to the stop wheel (3e).

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