A digital measurement device and method for frame diagonal deviation value

Abstract

The application provides a kind of frame diagonal deviation value digitization measuring device and method, belongs to the field of automobile manufacturing, measuring caliper tool is provided with strong magnet adsorbed to the first longitudinal beam web surface of frame, strong magnet is slidably connected with guide rail, guide rail is provided with positioning seat;Positioning seat is inserted into reference longitudinal beam hole;Guide rail is slidably connected with intermediate assembly;Indicating device measures the hole deviation between reference longitudinal beam hole and symmetrical hole;Two laser ranging tools are respectively installed at both ends of frame;Laser ranging tool is provided with laser ranging module and laser projection plate installed on longitudinal beam, and the size between longitudinal beam of frame is measured;Server platform obtains the size information of the position of both ends of frame, hole deviation and the distance between two laser ranging tools, and obtains the frame diagonal deviation value based on the system preset algorithm.The application guarantees the measurement accuracy, guarantees the operator of assembly line to be convenient and fast, and can effectively promote the improvement of frame manufacturing quality.

Description

Technical Field

[0001] The invention belongs to the field of automobile manufacturing, and in particular relates to a device and method for digitally measuring a frame diagonal deviation value. Background Art

[0002] Commercial vehicle frame manufacturers typically control frame diagonal deviation within 5mm during the manufacturing process. Excessive diagonal deviation can cause tire wear, swerving, and other issues, severely impacting the user experience. Some automakers use frame assembly to control frame diagonal and width. However, medium and heavy truck frames, engineering vehicle frames, and especially rear double-axle frames, are complex structures, particularly those 7-11.6 meters long. Limited by production line cycle times, limited space for tire assembly equipment, and limited riveting clamps, only a small number of rivets can be inserted during the assembly process. Consequently, diagonal deviation often fluctuates after the frame is assembled.

[0003] In existing technologies, some use a frame width gauge for frame assembly, making diagonal deviation measurement particularly important. This is done for quality control purposes, requiring frame diagonal measurement. A quicker approach is to create four process holes on the upper wing surface of the frame for measuring diagonal deviation, leaving the lower wing surface inaccessible. However, the upper wing surface is subject to significant stress and is prone to cracking at the edges of the holes, leading to frame failure, reduced vehicle safety, and inadequate operational stability.

[0004] Furthermore, due to the need for precise measurement and structural reasons, such as the variable cross-section at the front end of the frame, direct measurement using existing mounting holes is not possible. Manual measurement using a tape measure with line markings falls far short of the required accuracy (the line measurement accuracy deviation is 2-4mm) and is also inefficient. Installing the measuring fixture on the ventral surface, raising it above the upper wing surface of the frame, requires multiple steps, including disassembly, assembly, and adjustment of the measuring bracket. This is not only inefficient but also uncontrollable in measurement accuracy (because the ventral surface is entirely circular, the cumulative deviation after bracket installation can reach 3-10mm), failing to meet the required accuracy and efficiency. Summary of the Invention

[0005] The digital measurement device and method for the diagonal deviation value of the frame provided by the present invention are intended to solve various problems faced in measuring the diagonal deviation value of the truck frame during the riveting process and in measuring the diagonal value of the riveted frame or the finished frame. The digital measurement device and method for the diagonal deviation value of the frame have the advantages of flexibility, easy operation, online measurement, universality, high precision, informatization, and error prevention.

[0006] The digital measurement system for the diagonal deviation of the vehicle frame includes: a server platform, a measuring caliper tool and two laser distance measuring tools;

[0007] The measuring caliper tooling is provided with a strong magnet adsorbed on the underside of the first longitudinal beam of the vehicle frame, and a first guide rail is slidably connected to the strong magnet. A first positioning seat is provided at one end of the first guide rail; the first positioning seat is inserted into the reference longitudinal beam hole; a second positioning seat is provided at the other end of the first guide rail; the second positioning seat is inserted into the symmetrical hole of the second longitudinal beam;

[0008] An intermediate component is slidably connected to the first guide rail, the intermediate component is fixedly connected to the second guide rail, and an indicating device is installed on the second guide rail; the indicating device measures the hole deviation Δ between the reference longitudinal beam hole and the symmetrical hole;

[0009] Two laser ranging fixtures are installed at the two ends of the frame respectively; the laser ranging fixtures are equipped with a laser ranging module installed on the first longitudinal beam, and a laser projection board matching the laser ranging module is installed on the second longitudinal beam. The laser ranging module is used to measure the dimension between the first and second longitudinal beams of the frame;

[0010] The server platform communicates with the indicating device and the laser ranging module respectively to obtain the dimensional information y1 and y2 of the two end positions of the frame, the hole deviation Δ and the distance x2 between the two laser ranging tooling, and derives the diagonal deviation value of the frame based on the system preset algorithm.

[0011] It should be further explained that the laser ranging tooling is provided with a first magnet and a second magnet; the first magnet is adsorbed onto the underside of the first longitudinal beam at the first end of the vehicle frame; the laser ranging module is connected to the first magnet via bolts;

[0012] The second magnet is adsorbed on the second longitudinal beam at the first end of the vehicle frame; and the laser projection plate is mounted on the second magnet via bolts.

[0013] It should be further explained that a pressing block is provided on the first guide rail; the pressing block is arranged close to the strong magnet.

[0014] It should be further explained that the intermediate component is provided with a connecting plate and a positioning seat;

[0015] The positioning seat is provided with a tightening bolt; the positioning seat is slidably connected to the first guide rail and is fixed to the first guide rail by tightening the bolt;

[0016] The positioning seat is fixedly connected to the connecting plate, and the connecting plate is fixedly connected to the second guide rail.

[0017] It should be further explained that the laser ranging module is also bound to the vehicle frame via wire.

[0018] It should be further explained that a QR code is set on the frame, and the value of x2 is obtained by scanning the QR code.

[0019] It should be further explained that the server platform verifies the correctness of ξ1 by using the positive and negative correspondence between ξ1 and Δ.

[0020] It should be further explained that the server platform uses the following calculation formula for conversion:

[0021]

[0022] Wherein, L1 is the left diagonal length of the frame, and L2 is the right diagonal length of the frame.

[0023] It should be further explained that the server platform also configures a ξ value, where ξ is the sum of the actual value η of the deviation between the two diagonals and the deviation λ between the actual diagonal deviation value and the calculated value, i.e., ξ = η + λ;

[0024] The server platform defines a functional relationship between λ and Δ, y1, and y2:

[0025] λ=f(Δ,y1,y2)=b1Δ+b2y1+b3y2+a

[0026] b1, b2, and b3 are constants calculated through statistical analysis;

[0027] a is a constant;

[0028] The difference between the actual deviation value samples of n diagonal lines and the calculated value λ i The sum of squares of the differences between the corresponding actual non-sample λ and Q is solved as follows:

[0029]

[0030] λ i is the difference between the actual deviation sample and the calculated value of each diagonal line.

[0031] The present invention also provides a digital measurement method for a frame diagonal deviation value, the method comprising:

[0032] Step 1: Determine the position of the symmetrical hole on the ventral surface of the frame and define the first longitudinal beam of the frame as the reference longitudinal beam;

[0033] Step 2: Establish a triangulation model, measure the lengths of the two right-angled sides of the frame diagonal, and calculate the frame diagonal deviation value;

[0034] Step 3: Use a measuring caliper to measure the deviation Δ between the Y-direction hole position of the second longitudinal beam of the frame and the symmetrical hole of the reference longitudinal beam;

[0035] Step 4: Use the laser ranging module to measure the width y1 and width y2 of the two ends of the frame, and transmit the measured values ​​to the server platform (or do not need to measure the width y1 and width y2 and directly use the background preset values);

[0036] Step 5: Scan the QR code on the frame to obtain the distance between the two laser ranging tools x2;

[0037] Step 6: Use the following formula to calculate the diagonal deviation value ξ1:

[0038]

[0039] Step 7: Configure the server platform with a value of ξ, ξ = η + λ;

[0040] η is the actual value of the deviation between the two diagonals;

[0041] λ is calculated using the following formula: λ = f(Δ, y1, y2) = b1Δ + b2y1 + b3y2 + a;

[0042] b1, b2, and b3 are constants calculated through statistical analysis; a is a constant;

[0043] Define the functional relationship between λ and Δ, y1, and y2:

[0044] λ=f(Δ,y1,y2)=b1Δ+b2y1+b3y2+a

[0045] Then, by solving the minimum value of Q, we can get the formula for calculating λ:

[0046]

[0047] Based on the obtained ξ1, ξ1 is corrected by λ, and the corrected η result is the final measurement result.

[0048] It can be seen from the above technical solutions that the present invention has the following advantages:

[0049] The digital measurement system for the diagonal deviation value of a vehicle frame provided by the present invention solves the problem of the process hole positions in the existing measurement method for measuring the wing surface of the frame, and avoids the process holes being subjected to stress during the use of the user's vehicle, causing the frame to crack, thereby causing quality problems in the vehicle.

[0050] The present invention utilizes symmetrical holes on the belly surface of the frame and uses one of the longitudinal beams of the frame for positioning. The measured frame can be placed at will, which facilitates the measurement operation and improves the measurement efficiency.

[0051] This invention utilizes the structure and measurement principles of a vernier caliper to design and manufacture a measuring caliper fixture that can move simultaneously in the X- and Y-axis directions. This fixture measures the deviation Δ between the Y-axis hole position of another longitudinal beam of a vehicle frame and the symmetrical hole of a reference longitudinal beam. The device offers simple measurement, high accuracy, convenient digital readings, and a reasonable reading error. The device utilizes a laser rangefinder module to measure the values ​​of the vehicle frame widths y1 and y2. Bluetooth functionality enables automatic transmission and storage of the measured data, ensuring traceability. The operator does not need to read or input the values ​​of y1 and y2, thus avoiding human input errors. Furthermore, normal operation by the operator does not affect the errors in the y1 and y2 measurement results.

[0052] The present invention limits the y1 and y2 of the corresponding vehicle frame that can be measured by laser ranging in physical space, utilizes the system to receive data sent by different laser ranging, automatically identifies y1 and y2, and automatically brings them into the calculation formula. The operator does not need to follow the measurement sequence, nor does he need to consider the input sequence of y1 and y2, and has the function of preventing mistakes and foolproofing.

[0053] The present invention also utilizes the trigonometric and order-of-magnitude relationships between the theoretical and actual measured values ​​of y1 and y2 to mitigate the impact of various deviations. This eliminates the need to measure process hole locations on the upper wing surface of the vehicle frame, preventing cracking in the holes under harsh operating conditions during aftermarket use, effectively improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0055] Figure 1 This is a schematic diagram of the digital measurement system for the frame diagonal deviation value;

[0056] Figure 2 This is a schematic diagram of the measuring caliper tooling;

[0057] Figure 3 This is a schematic diagram of the laser ranging tooling installation. DETAILED DESCRIPTION

[0058] The following will be combined Figures 1 to 3 The present invention will now be described in detail as a digital measurement system for vehicle frame diagonal deviation. This system can be applied to measure and calculate vehicle frame diagonal deviation during the manufacturing process. This system addresses the existing problem of the front end of the vehicle frame having a variable cross-section, which prevents direct measurement using existing mounting holes. Furthermore, the present invention eliminates the need for manual measurement with a tape measure, improving measurement accuracy, meeting measurement requirements, and enhancing efficiency.

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0060] The digital measurement system for the diagonal deviation of a vehicle frame provided by the present invention provides a measuring caliper tool for measuring Δ. The measuring caliper tool adopts a digital display screen with an indication error of ±0.05mm and a resolution of 0.01mm.

[0061] Specifically, the measuring caliper tool is provided with a strong magnet 4 that is adsorbed on the ventral surface of the first longitudinal beam of the frame, and the first guide rail 2 is slidably connected to the strong magnet 4. A first positioning seat 5 is provided at one end of the first guide rail 2; the first positioning seat 5 is inserted into the reference longitudinal beam hole; the other end of the first guide rail 2 is provided with a second positioning seat 1; the second positioning seat 1 is inserted into the symmetrical hole of the second longitudinal beam; a clamping block 6 is provided on the first guide rail 2; the clamping block 6 is arranged close to the strong magnet 4.

[0062] The intermediate component is provided with a connecting plate 10 and a positioning seat 3; the positioning seat 3 is provided with a tightening bolt 9; the positioning seat 3 is slidingly connected to the first guide rail 2 and is fixed to the first guide rail 2 by tightening the bolt 9; the positioning seat 3 is fixedly connected to the connecting plate 10, and the connecting plate 10 is fixedly connected to the second guide rail 8.

[0063] An intermediate component is slidably connected to the first guide rail 2, and the intermediate component is fixedly connected to the second guide rail 8. An indicating device 7 is installed on the second guide rail 8; the indicating device 7 measures the hole deviation Δ between the reference longitudinal beam hole and the symmetrical hole.

[0064] For example, the present invention may also adopt another measuring fixture: one measuring caliper fixture is bolted to the underside of the frame, and the other measuring caliper fixture is bolted to a symmetrical position on the underside of another longitudinal beam of the frame. A vernier caliper is used to measure the gap between the two measuring caliper fixtures to obtain the value of the hole deviation Δ.

[0065] The present invention also involves two laser ranging fixtures, one mounted on each end of the vehicle frame. Each fixture includes a laser ranging module 11 mounted on a first longitudinal beam and secured to the vehicle frame via a wire 15. A laser projection board 13, compatible with the laser ranging module 11, is mounted on a second longitudinal beam. The laser ranging module 11 is used to measure the distance between the first and second longitudinal beams of the vehicle frame.

[0066] In the embodiment of the present application, the laser ranging tool is provided with a first magnet and a second magnet; the first magnet is adsorbed to the first longitudinal beam web surface at the first end of the vehicle frame; the laser ranging module 11 is connected to the first magnet through bolts; the second magnet is adsorbed to the second longitudinal beam at the first end of the vehicle frame; and the laser projection plate 13 is installed to the second magnet through bolts.

[0067] In the embodiment of the present application, the server platform is respectively connected in communication with the indicating device 7 and the laser ranging module 11, obtains the size information y1 and y2 of the positions at both ends of the vehicle frame, the hole deviation Δ, and the distance x2 between the two laser ranging tools, and obtains the diagonal line deviation value of the vehicle frame based on a system preset algorithm.

[0068] In one exemplary embodiment, the laser ranging module is used to measure the values of y1 and y2, the measurement accuracy is ±1mm, the laser ranging module 11 can also be fixed to the first magnet 12 through bolts, the first magnet 12 is adsorbed to the longitudinal beam web surface, the baffle 13 is fixed to the second magnet 14 through bolts, and the second magnet 14 is adsorbed to the other longitudinal beam web surface; the positions adsorbed by the first magnet 13 and the second magnet 14 are approximately symmetrical.

[0069] The laser ranging module 11 emits laser light through dry electromagnetic power supply, and the laser light is reflected back to the laser ranging module 11 after encountering the baffle 13, so as to measure the values of y1 and y2.

[0070] Alternatively, the laser ranging module 11 can also be fixed to a relatively fixed physical position through an iron chain or other ways, the length of the iron chain is much shorter than the distance x2, so as to prevent the laser ranging module from being mixed when measuring y1 and y2, and ensure that y1 and y2 correspond to the laser ranging module one by one.

[0071] The system of the present application can automatically identify y1 and y2 transmitted by the laser ranging module through Bluetooth. The laser ranging module has a Bluetooth data transmission function, transmits data to the WeChat applet, the applet automatically identifies the values of y1 and y2, and automatically brings the calculation formula of ξ1.

[0072] The present application utilizes the measurement accuracy of the laser ranging module, the deviation values of y1 and y2 in the X-axis direction are basically consistent, more importantly, the deviation values of y1 and y2 in the Y-axis direction are extremely small, and the influence of the position accuracy of the laser ranging module on the vehicle frame longitudinal beam when an operator measures the values of y1 and y2 does not need to be considered.

[0073] In the present application, the normal operation of the operator does not affect the measurement results of y1 and y2, and the trigonometric function relationship and order of magnitude relationship between the theoretical values and the actual measurement values of y1 and y2 (including the measurement device itself deviation, measurement position deviation, operation mode deviation, etc.) are utilized, and the influence of various deviations does not need to be considered.

[0074] For example, when the deviation of the measuring tool or operating method reaches 5mm, the final impact on ξ1 is only 0.01009mm, which has the greatest impact on the frame width of 865mm. For example, when measuring y1 and y2, when the measurement position deviation reaches 50mm, the impact on the final diagonal deviation value is only 0.04mm.

[0075] According to an embodiment of the present application, the server platform features a WeChat mini-program scanning function. Operators obtain the x2 value of the vehicle frame in advance and generate a QR code. The system then connects to a QR code printer, which can batch-print QR codes (with self-adhesive, appropriately sized format) and affix them to the vehicle card attached to each vehicle frame. Each QR code is printed with the corresponding order number and other information below it. When measuring the diagonal of a vehicle frame on the assembly line, operators use WeChat's "Scan" function to scan the QR code on each vehicle frame's attached card. The mini-program automatically reads the x2 value and automatically incorporates it into the calculation formula for ξ1.

[0076] In the present invention, the operator can use the value automatically recognized by the server platform and enter it into the calculation formula of ξ1 to obtain ξ1. It can be used on mobile phones and on the Internet, and can be operated anytime and anywhere.

[0077] The present invention also has a server platform, which can store data ξ1 and various data such as order numbers for subsequent traceability queries.

[0078] When calculating ξ1, the server platform automatically identifies the values ​​of Δ, x2, y1, and y2, and automatically brings them into the calculation formula of ξ1 to prevent the operator from entering incorrect values ​​or the wrong order, which may lead to an incorrect value of the final ξ1.

[0079] The server platform automatically identifies Δ and x2 through the inherent rules of Δ, x2, y1, and y2, that is, Δ is always the minimum value and x2 is always the maximum value.

[0080] The present invention also identifies y1 and y2 by receiving data transmitted by different laser ranging modules.

[0081] The system also features a further error-proofing feature, namely the ξ1 value. Using a digital model of the vehicle frame as a backdrop and indicating the direction of Δ deviation, employees can measure Δ by simply clicking anywhere on the server interface (demarcated by a dividing line) in the area corresponding to the Δ deviation direction. The system automatically determines whether the calculated result matches the clicked result and displays the result. This prevents employees from manually entering the Δ value and causing errors. This is because negative Δ corresponds to a ξ1 value greater than 0, while positive Δ corresponds to a ξ1 value less than 0. If the positive or negative value of Δ is entered incorrectly, the final calculated result will be inconsistent with the result obtained by manually clicking on the interface. The server displays not only the specific diagonal deviation value but also a simplified graphical representation of the frame deviation type, making it easier for employees to adjust the diagonal. This utilizes four different frame deviation conditions corresponding to the deviation values ​​in different directions of Δ, y1, and y2.

[0082] Due to the limitations of the frame crossbar, the four deviation scenarios can be reduced to two cases without considering the influence of the y value, where the y value can be replaced by a theoretical value. To minimize the deviation between the calculated and actual values, the ξ value is assumed to be the sum of the actual value η and the deviation value λ, that is, ξ = η + λ. It is assumed that there is a functional relationship between λ and Δ, y1, and y2: λ = f(Δ, y1, y2) = b1Δ + b2y1 + b3y2 + a. By solving for the minimum value of Q, the specific calculation formula for λ is obtained:

[0083] Based on the obtained ξ1, ξ1 is corrected by λ, and the corrected result η is the final measurement result.

[0084] The following is an embodiment of a digital measurement method for vehicle frame diagonal deviation values ​​provided by the present disclosure. This method and the digital measurement system for vehicle frame diagonal deviation values ​​of the aforementioned embodiments are based on the same inventive concept. For details not fully described in the embodiments of the digital measurement method for vehicle frame diagonal deviation values, reference can be made to the embodiments of the digital measurement system for vehicle frame diagonal deviation values ​​described above. The method comprises:

[0085] Step 1: Determine the position of the symmetrical hole on the ventral surface of the frame and define the first longitudinal beam of the frame as the reference longitudinal beam;

[0086] Step 2: Establish a triangulation model, measure the lengths of the two right-angled sides of the frame diagonal, and calculate the frame diagonal deviation value;

[0087] Step 3: Use a measuring caliper to measure the deviation Δ between the Y-direction hole position of the second longitudinal beam of the frame and the symmetrical hole of the reference longitudinal beam;

[0088] Step 4: Use the laser ranging module to measure the width y1 and width y2 of the two ends of the frame, and transmit the measured values ​​to the server platform (or do not need to measure the width y1 and width y2 and directly use the background preset values);

[0089] Step 5: Scan the QR code on the frame to obtain the distance between the two laser ranging tools x2;

[0090] Step 6: Use the following formula to calculate the diagonal deviation value ξ1:

[0091]

[0092] Step 7: Configure the server platform with a value of ξ, ξ = η + λ;

[0093] η is the actual value of the deviation between the two diagonals (here it is the corrected value);

[0094] λ is calculated by the following formula,

[0095] λ=f(Δ,y1,y2)=b1Δ+b2y1+b3y2+a

[0096] b1, b2, and b3 are constants calculated through statistical analysis; a is a constant;

[0097] Define the functional relationship between λ and Δ, y1, and y2:

[0098] λ=f(Δ,y1,y2)=b1Δ+b2y1+b3y2+a

[0099] Then, by solving the minimum value of Q, we can get the formula for calculating λ:

[0100]

[0101] Based on the obtained ξ1, ξ1 is corrected by λ, and the corrected result η is the final measurement result.

[0102] Based on the above method, the present invention can utilize the WeChat scanning function and the vehicle card of each frame to scan the code, and the system automatically extracts the value of x2 and performs calculations.

[0103] The server platform of the present invention can store data, making the data searchable, traceable, and available anytime and anywhere.

[0104] The present invention utilizes the intrinsic size relationship, order of magnitude relationship and position relationship of the values ​​of x2, y1, y2 and Δ, and does not require high numerical accuracy of x2, y1 and y2. The theoretical data can be directly used for x2, and y1 and y2 can be measured arbitrarily or replaced by theoretical values. Large deviations are allowed, and the system automatically identifies the corresponding values ​​of x2, y1, y2 and Δ to prevent errors and foolishness.

[0105] The present invention also utilizes the system's inherent algorithmic logic, combined with graphical prompts, to prevent measurement and calculation errors and guide the operator to adjust the frame diagonal based on the measurement results, making it clear to the operator at a glance. Furthermore, by utilizing the positive and negative correspondence between ξ1 and Δ, the system automatically performs secondary error prevention and foolproofing on the accuracy of ξ1.

[0106] The method of the present invention uses the following calculation formula for conversion (where ξ1 is all diagonal deviation values):

[0107]

[0108] Based on the above method, the present invention utilizes the fact that the Z-direction deviation of the left and right longitudinal beams has little effect on ξ1. Furthermore, when the vehicle frame is on the assembly line, the Z-direction height of the left and right planes is consistent, eliminating the need to consider the impact of Z-direction deviation on ξ1. The present invention discovers and utilizes the trigonometric and order-of-magnitude relationships between the theoretical values ​​of y1 and y2 and the actual measured values ​​(including deviations in the measuring device itself, measurement position, and operating mode), eliminating the need to consider the impact of various deviations.

[0109] For example, when the deviation of the measuring tool or operating method reaches 5mm, the final impact on ξ1 is only 0.01009mm, based on the frame width of 865mm, which has the greatest impact. For example, when measuring y1 and y2, when the measurement position deviation reaches 50mm, the impact on the final diagonal deviation value is only 0.04mm. In addition, there is no need to measure the process hole positions on the wing surface of the frame, which avoids cracking of the holes under harsh working conditions during after-sales use of the vehicle, effectively improving product quality.

[0110] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0111] In embodiments of the present invention, computer program code for performing the operations of the present disclosure may be written in one or more programming languages ​​or a combination thereof, including but not limited to object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages.

[0112] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one 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 limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A digital measurement system for frame diagonal deviation, characterized in that: include: Server platform, measuring caliper fixture and two laser distance measuring fixtures; The measuring caliper tooling is provided with a strong magnet (4) adsorbed on the belly surface of the first longitudinal beam of the vehicle frame, a first guide rail (2) is slidably connected to the strong magnet (4), a first positioning seat (5) is provided at one end of the first guide rail (2); the first positioning seat (5) is plugged into the reference longitudinal beam hole; a second positioning seat (1) is provided at the other end of the first guide rail (2); the second positioning seat (1) is plugged into the symmetrical hole of the second longitudinal beam; An intermediate component is slidably connected to the first guide rail (2), the intermediate component is fixedly connected to the second guide rail (8), and an indicating device (7) is installed on the second guide rail (8); the indicating device (7) measures the hole deviation Δ between the reference longitudinal beam hole and the symmetrical hole; Two laser distance measuring tools are respectively installed at the two ends of the vehicle frame; the laser distance measuring tool is provided with a laser distance measuring module (11) installed on the first longitudinal beam, and a laser projection plate (13) matching the laser distance measuring module (11) is installed on the second longitudinal beam, and the laser distance measuring module (11) is used to measure the size between the first longitudinal beam and the second longitudinal beam of the vehicle frame; The server platform is respectively connected to the indicating device (7) and the laser ranging module (11) for communication, and obtains the dimension information y1 and y2 of the two end positions of the frame, the hole deviation Δ, and the spacing x2 between the two laser ranging fixtures, and obtains the frame diagonal deviation value based on the system preset algorithm.

2. The digital measurement system for vehicle frame diagonal deviation according to claim 1, characterized in that: The laser distance measuring tool is provided with a first magnet and a second magnet; the first magnet is adsorbed on the belly surface of the first longitudinal beam at the first end of the vehicle frame; the laser distance measuring module (11) is connected to the first magnet via bolts; The second magnet is adsorbed on the second longitudinal beam at the first end of the vehicle frame; and the laser projection plate (13) is mounted on the second magnet via bolts.

3. The digital measurement system for frame diagonal deviation according to claim 1, characterized in that: A pressing block (6) is provided on the first guide rail (2); the pressing block (6) is arranged close to the strong magnet (4).

4. The digital measurement system for vehicle frame diagonal deviation according to claim 1, characterized in that: The middle component is provided with a connecting plate (10) and a positioning seat (3); A tightening bolt (9) is provided on the positioning seat (3); the positioning seat (3) is slidably connected to the first guide rail (2) and is fixed to the first guide rail (2) by tightening the bolt (9); The positioning seat (3) is fixedly connected to the connecting plate (10), and the connecting plate (10) is fixedly connected to the second guide rail (8).

5. The digital measurement system for vehicle frame diagonal deviation according to claim 2, characterized in that: The laser distance measuring module (11) is also bound to the vehicle frame via an iron wire (15).

6. The digital measurement system for frame diagonal deviation according to claim 1, characterized in that: A QR code is set on the frame. By scanning the QR code, the calculation formula for the frame diagonal deviation value and the value of x2 are obtained.

7. The digital measurement system for vehicle frame diagonal deviation according to claim 6, characterized in that: The server platform uses the positive and negative correspondence between ξ1 and Δ to verify the correctness of ξ1.

8. The digital measurement system for vehicle frame diagonal deviation according to claim 7, characterized in that: The server platform uses the following calculation formula for conversion: Wherein, L1 is the left diagonal length of the frame, and L2 is the right diagonal length of the frame.

9. The digital measurement system for vehicle frame diagonal deviation according to claim 8, characterized in that: The server platform also configures a ξ value, where ξ is the sum of the actual value η of the two diagonal deviations and the deviation λ between the actual diagonal deviation and the calculated value, i.e., ξ = η + λ; The server platform defines a functional relationship between λ and Δ, y1, and y2: λ=f(Δ,y1,y2)=b1Δ+b2y1+b3y2+a; b1, b2, and b3 are constants calculated through statistical analysis; a is a constant; The difference between the actual deviation value samples of n diagonal lines and the calculated value λ i The sum of squares of the differences between the corresponding actual non-sample λ and Q is solved as follows: λ i is the difference between the actual deviation sample and the calculated value of each diagonal line.

10. A digital measurement method for frame diagonal deviation, characterized in that: The method adopts the digital measurement system for the diagonal deviation value of the frame according to any one of claims 1 to 9; Methods include: Step 1: Determine the position of the symmetrical hole on the ventral surface of the frame and define the first longitudinal beam of the frame as the reference longitudinal beam; Step 2: Establish a triangulation model, measure the lengths of the two right-angled sides of the frame diagonal, and calculate the frame diagonal deviation value; Step 3: Use a measuring caliper to measure the deviation Δ between the Y-direction hole position of the second longitudinal beam of the frame and the symmetrical hole of the reference longitudinal beam; Step 4: Use the laser ranging module to measure the width y1 and width y2 of the two ends of the frame, and transmit the measured values ​​to the server platform (or do not need to measure the width y1 and width y2 and directly use the background preset values); Step 5: Scan the QR code on the frame to obtain the distance between the two laser ranging tools x2; Step 6: Use the following formula to calculate the diagonal deviation value ξ1: Step 7: Configure the server platform with a value of ξ, ξ = η + λ; η is the actual value of the deviation between the two diagonals; λ is calculated using the following formula: λ = f(Δ, y1, y2) = b1Δ + b2y1 + b3y2 + a; b1, b2, and b3 are constants calculated through statistical analysis; a is a constant; Define the functional relationship between λ and Δ, y1, and y2: λ=f(Δ,y1,y2)=b1Δ+b2y1+b3y2+a Then, by solving the minimum value of Q, we can get the formula for calculating λ: Based on the obtained ξ1, ξ1 is corrected by λ, and the corrected result η is the final measurement result.

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