Positive grid rib strength detection device

Abstract

The utility model discloses a device for detecting the strength of a positive grid rib, which comprises a base, a plurality of guide posts are vertically fixed on the base, and a screw rod is rotationally connected between the guide posts on the base; a plurality of sliding holes matched with the guide columns are formed in the pressure gauge frame, a screw hole matched with the screw is formed in the pressure gauge frame, and rotation of the screw promotes the pressure gauge frame to ascend and descend along the guide columns; the pressure detector is fixed at one end of the pressure gauge frame, and a detection head is arranged at the bottom end of the pressure detector; the supporting plate is fixed on the base and located below the pressure detector, a through hole is formed in the supporting plate, the center of the through hole and the center of the detection head are collinear, and the supporting plate is used for placing a detected grid. The method comprises the following steps: respectively taking the same batch of grids subjected to high-temperature age hardening, the grids subjected to curing and drying after plate coating and a plurality of formed grids for detection, respectively obtaining detection values of grid ribs at different stages, and then judging whether the detection values are qualified or not.

Description

Technical Field

[0001] This utility model belongs to the field of lead-acid battery manufacturing technology, specifically relating to a device for testing the strength of positive grid ribs. Background Technology

[0002] The grid is a major component of a lead-acid battery, serving as the current-collecting skeleton of the electrodes. It conducts and collects current, ensuring its uniform distribution, and also supports the active material, acting as its carrier. The grid must possess sufficient hardness and mechanical strength to withstand the coating and assembly processes involved in battery manufacturing. During battery production, the grid undergoes casting, aging hardening, coating, curing and drying, and formation. The strength of the grid ribs changes throughout the manufacturing process. Weak areas of the grid ribs gradually fail and fracture during manufacturing and battery use, ultimately leading to battery failure.

[0003] How to test the strength of the grid reinforcement bars through experiments has become a research topic for various battery manufacturers.

[0004] Chinese patent CN202020831382.3 discloses a battery grid strength testing device that tests the strength of the grid after age hardening by applying tensile force. However, the grid strength test only measures the strength of the entire grid panel, without testing the grid ribs.

[0005] Currently, the strength testing of slatted floors mainly relies on the experience of the inspectors. They hold the slatted floor horizontally at about one-quarter of its length and shake it up and down, judging its quality by whether the floor recovers its shape after bending. This method only provides an appearance test of the overall strength of the slatted floor; it lacks quantification and does not test the strength of the reinforcing ribs.

[0006] Studying the changes in the strength of gratings during the production process and identifying the main processes and parameters that affect the strength of gratings is of positive significance for improving the strength and corrosion resistance of gratings.

[0007] Therefore, how to provide a device for testing the strength of the reinforcing bars of a slab grid is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0008] In view of this, the present invention provides a testing device for the strength of the reinforcing bars of a grating, which can intuitively reflect the degree of influence of different processes and parameters on the strength of the grating, and is convenient to test.

[0009] To achieve the above objectives, this utility model adopts the following technical solution: a device for detecting the strength of the reinforcing bars of a slab grid, comprising:

[0010] A base, on which multiple guide posts are vertically fixed, and a screw is rotatably connected to the base and located between the guide posts;

[0011] A pressure gauge holder is provided with multiple sliding holes for mating guide posts, and a screw hole for mating screw is provided on the pressure gauge holder. The rotation of the screw causes the pressure gauge holder to move up and down along the guide posts.

[0012] A pressure detector, which is fixed to one end of the pressure gauge holder, and a detection head is provided at the bottom end of the pressure detector;

[0013] A tray is fixed on the base and located below the pressure detector. The tray has a through hole, the center of which is collinear with the center of the detection head. The tray is used to place the plate grid to be tested.

[0014] The beneficial effects of this utility model are: the pressure detector moves up and down along the guide column under the drive of the pressure gauge frame. The specific adjustment relies on the screw and the screw rotation relationship of the pressure gauge frame. The pressure detector can intuitively obtain the strength value of the grid strip of the tested plate on the support plate. It can be used in batches and has high testing efficiency.

[0015] Preferably, a bracket is fixed to the top of each of the multiple guide posts, and a center hole for a positioning screw is provided in the middle of the bracket. A rotating handwheel is fixedly connected to the top of the screw.

[0016] The resulting technical effect is that the bracket is used to stabilize the guide column, while the screw establishes a fixed-axis rotational connection with the bracket and the base. It can be understood that the connection between the screw and the bracket and the base is smooth, while the connection between the screw and the pressure gauge frame is threaded. By rotating the screw, the pressure gauge frame is moved up and down along the guide column, and rotating the handwheel makes it easy to turn the screw.

[0017] Preferably, the detection head is a cylindrical head, the contact bottom surface of the detection head is smooth and flat, the support plate is a stainless steel plate, and the diameter of the through hole is larger than the outer contour diameter of the detection head.

[0018] The resulting technical effects are: firstly, the detection head is used to break the ribs of the grating; secondly, it works with the pressure detector to determine the strength value of the ribs at that location. The through hole can be understood as a clearance cavity for the detection head.

[0019] Preferably, the pressure detector is equipped with a zeroing button.

[0020] The resulting technical effect is that, in order to ensure the accuracy of the test results, it is necessary to repeatedly zero out the pressure values ​​at different test points to obtain more accurate average comparison data. Attached Figure Description

[0021] Figure 1 The present invention relates to a device for testing the strength of rib bars in a slab grid. Figure 1 ;

[0022] Figure 2 The present invention relates to a device for testing the strength of rib bars in a slab grid. Figure 2 ;

[0023] Figure 3 This is a structural diagram of the support plate of a device for testing the strength of rib bars in a slab grid according to the present invention;

[0024] Figure 4 This is a schematic diagram of the test point of the grid plate of this utility model.

[0025] 1. Base, 2. Guide post, 3. Screw, 4. Pressure gauge holder, 5. Pressure detector, 51. Detection head, 52. Zeroing button, 53. Detection dial, 6. Support plate, 61. Through hole, 7. Bracket, 8. Rotary handwheel, 9. Grid plate to be tested. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] See appendix to this utility model Figures 1 to 4 According to an embodiment of the present invention, a device for detecting the strength of rib bars in a slab grid includes:

[0028] A base 1, on which multiple guide posts 2 are vertically fixed, and a screw 3 is rotatably connected to the base 1 and located between the guide posts 2;

[0029] The pressure gauge holder 4 has multiple sliding holes that mate with the guide post 2, and a screw hole that mates with the screw 3. The rotation of the screw 3 causes the pressure gauge holder 4 to move up and down along the guide post 2.

[0030] Pressure detector 5, which can be a pressure gauge in specific use, is fixed to one end of pressure gauge frame 4, and the bottom of pressure detector 5 is provided with detection head 51;

[0031] The support plate 6 is fixed on the base 1 and located below the pressure detector 5. The support plate 6 has a through hole 61, the center of which is collinear with the center of the detection head 51. The support plate 6 is used to place the plate grid 9 to be tested.

[0032] In some other embodiments, a bracket 7 is fixed to the top of the multiple guide posts 2, and a center hole for the clearance screw 3 is provided in the middle of the bracket 7. A rotating handwheel 8 is fixedly connected to the top of the screw 3 to facilitate screwing.

[0033] In some other specific embodiments, the detection head 51 is a cylindrical head with a diameter of 4mm. The contact bottom surface of the detection head 51 is smooth and flat. The support plate 6 is a 10mm thick stainless steel plate, which is fixed to the base by screws. A through hole 61 with a diameter of 10mm is provided on the support plate, and the center of the hole coincides with the center of the detection head.

[0034] In some other embodiments, the pressure detector 5 is provided with a zeroing button 52.

[0035] A method for testing the strength of rib bars in a slab grid, comprising the following steps:

[0036] Step 1: Prepare the grid to be tested. Take 10 grids from the same batch of grids, including the grids that have been hardened by high temperature aging, the grids that have been coated and cured and dried, and the grids that have been formed.

[0037] Step 2: Mark the detection points. Divide the grid into three regions along its length, labeled A, B, and C. Take six detection points evenly within each region and label them as 1A, 2A, 3A, 4A, 5A, 6A; 1B, 2B, 3B, 4B, 5B, 6B; 1C, 2C, 3C, 4C, 5C, 6C.

[0038] Step 3: Testing. Fix the tray to the base with screws. Place the grid rib to be tested on the center of the through hole of the tray. Zero the pressure detector. Slowly rotate the screw to lower the pressure gauge holder and the pressure detector. When the grid rib contacts the test head, continue to slowly rotate the screw until the rib breaks. Read the pressure detector value N and return it to zero. Test and record the values ​​of multiple test points in each area in sequence.

[0039] Step 4: Result Determination. The measured value of the grating reinforcement in each region is the average value of all measured points within that region. The strength of the grating reinforcement after high-temperature aging hardening is N1. The reinforcement strength of each region is: N 1A N 1B N 1C The strength of the grating reinforcement bars after coating and curing is N2, and the strength of the reinforcement bars in each area is: N 2A N 2B N 2C The strength of the grating reinforcement after formation is N3, and the strength of the reinforcement in each region is: N 3A N 3B N 3C ;

[0040] Grid stiffener strength: The average value of multiple regions in different stages of the production process is obtained. When N2>0.8N1 and N3>0.6N2, the grid meets the requirements for battery production and use, and the grid is qualified. It should be noted that the values ​​of N1, N2 and N3 are the average values ​​of multiple regions in each production stage, and the value in each region is the average value of multiple test points in that region.

[0041] In some other embodiments, in step one, after curing, drying and forming, the lead paste on the grid of the electrode plate is removed, and it is boiled in the prepared solution A for 30 minutes to remove the residual lead dioxide on the grid.

[0042] Solution A is prepared by dissolving 10g of glucose in 300ml of 30% sodium hydroxide solution in 700ml of distilled water and boiling. This method is safer than using traditional 100% pure sodium hydroxide solution.

[0043] In some other specific embodiments, in step two, during battery operation, the grid vertical ribs are the main path for current input and output, so only the vertical ribs are selected as the grid strength detection points.

[0044] The average of the test values ​​from 10 plates at each test point is taken as the test value for that point. The test value for each region is the average of the values ​​from 6 test points in that region, denoted as N. A N B N C The strength test value of the age-hardened grid reinforcement bars is N1, and the strength test value of the grid reinforcement bars in each region is N. A1 N B1 N C1 The strength test value of the grid reinforcement strips after curing and drying is N2, and the strength test value of the grid reinforcement strips in each area is N. A2 N B2 N C2 The measured value of the grid after formation is N3, and the measured value of the rib strength in each region is N. A3 N B3 N C3 Throughout the battery production process, the grid stiffeners that have undergone high-temperature aging hardening have the highest strength. As the battery is coated, cured, and formed, the strength of the grid stiffeners gradually decreases due to corrosion. To ensure battery performance, the grid stiffener strength must meet the following requirements: N2 > 0.8N1; N3 > 0.6N2. When the grid stiffener strength does not meet these requirements, the grid design needs to be optimized, and the technical parameters of the corresponding manufacturing processes need to be adjusted.

[0045] Specific application examples

[0046] The strength of the G15A positive grid, which has the highest production volume in the company, was tested using the testing method of this technical solution. The results are as follows:

[0047]

[0048] The 12V 100Ah battery assembled using G15A grids was tested for high temperature accelerated float charge life according to the YD / T 799-2010 standard "Valve-regulated sealed lead-acid batteries for communication", and all 6 cells met the standard requirements.

[0049] The apparatus and methods disclosed in the embodiments are described simply because they correspond to the methods disclosed in the embodiments. For relevant details, please refer to the method section.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for testing the strength of rib bars in a slab grid, characterized in that, include: A base (1) has multiple guide posts (2) vertically fixed on it, and a screw (3) is rotatably connected to the base (1) and located between the guide posts (2). Pressure gauge holder (4), the pressure gauge holder (4) is provided with multiple sliding holes that cooperate with guide posts (2), the pressure gauge holder (4) is provided with screw holes that cooperate with screws (3), the rotation of the screws (3) causes the pressure gauge holder (4) to move up and down along the guide posts (2); Pressure detector (5), the pressure detector (5) is fixed at one end of the pressure gauge frame (4), and the bottom end of the pressure detector (5) is provided with a detection head (51); The tray (6) is fixed on the base (1) and located below the pressure detector (5). The tray (6) has a through hole (61) with the center of the through hole (61) collinear with the center of the detection head (51). The tray (6) is used to place the plate grid (9) to be tested.

2. The device for detecting the strength of the reinforcing bars of a slab grid according to claim 1, characterized in that, The top of the multiple guide posts (2) is fixed with a bracket (7), the middle of the bracket (7) is provided with a center hole of the clearance screw (3), and the top of the screw (3) is fixedly connected with a rotating handwheel (8).

3. The device for detecting the strength of the reinforcing bars of a slab grid according to claim 1, characterized in that, The detection head (51) is a cylindrical head, the contact bottom surface of the detection head (51) is smooth and flat, the support plate (6) is a stainless steel plate, and the diameter of the through hole (61) is larger than the outer contour diameter of the detection head (51).

4. The device for detecting the strength of the reinforcing bars of a slab grid according to claim 1, characterized in that, The pressure detector (5) is equipped with a zeroing button (52).

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