A seat sip point calibration device and a method for accurately measuring seat sip points

Abstract

The application discloses a kind of seat SIP point calibration device, utilize 3D printing technology to make seat SIP point calibration device, seat SIP point calibration device is integrally formed using macromolecular polymer material, the seat SIP point calibration device includes bottom plate, back plate and side wing plate, the front end of bottom plate is provided with V-shaped gap in the middle, back plate is vertically installed at the back side of bottom plate, side wing plate is arranged at the both ends of back plate, still be provided with web between bottom plate and back plate, web is in the center of bottom plate and back plate, symmetric perforation is provided on side wing plate, measuring rod is inserted in perforation.The application provides the method for using specific material to make seat SIP point calibration device and seat SIP point accurate measurement by 3D printing, the material selected can meet the requirements of standard for device volume and weight simultaneously;Seat SIP point calibration device is integrally formed, simple to process and manufacture, precision meets or even exceeds the requirements of standard for measuring device;Quality is solid, durable, and will not appear deformation, cracking in later use.

Description

Technical Field

[0001] This invention belongs to the technical field of agricultural machinery safety testing, specifically relating to a seat SIP point calibration device and a method for accurate measurement of seat SIP points. Background Technology

[0002] Currently, most common methods for measuring the SIP points of seats in agricultural and forestry machinery or engineering vehicles involve indirect measurement using wooden or metal calibration devices and steel tape measures or rulers.

[0003] Existing methods have many problems:

[0004] (1) Using a pure wooden device, adjust the table and chairs, place the wooden chair SIP point measuring device on the chair and apply a suitable weight, and use a steel tape measure to indirectly measure the height of the chair SIP point relative to the chair base. The chair SIP point is located on the middle longitudinal surface of the chair, and the position of the middle longitudinal surface on the base is recorded. This method firstly requires very high quality wood to meet the standard requirements for volume and weight. Only a very few hardwoods such as rosewood can barely meet the requirements. Secondly, it requires high woodworking skills, takes a long time to make, has low precision, and has high unit cost. In the later use, the wood is prone to cracking. Finally, it can only measure the position of the chair SIP point relative to the chair base, and cannot directly mark the spatial position of the SIP point, resulting in poor precision.

[0005] (2) If the device is made by machining pure metal, it is impossible to achieve the required volume and weight according to the standard, whether it is pure aluminum or aluminum-magnesium alloy, and the cost is high.

[0006] (3) The method of using wood as the surface and metal as the lining can achieve the required volume and weight, but it is difficult to combine the two, and the processing is complicated, time-consuming and labor-intensive.

[0007] (4) All three devices and steel tape measure or steel ruler can only indirectly measure the position relative to the seat base plate, and cannot directly and accurately mark the spatial position of the seat SIP point. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides a method for accurately measuring seat SIP points using a seat SIP point calibration device manufactured with 3D printing technology.

[0009] The solution adopted by this invention to solve its technical problem is: a seat SIP point calibration device, which is made using 3D printing technology. The seat SIP point calibration device is integrally molded from a high polymer material. The seat SIP point calibration device includes a base plate, a back plate, and side wing plates. A V-shaped notch is provided in the middle of the front end of the base plate. The back plate is vertically installed on the rear side of the base plate. The side wing plates are located at both ends of the back plate. A stiffening plate is also provided between the base plate and the back plate. The stiffening plate is located in the center of the base plate and the back plate. Symmetrical perforations are provided on the side wing plates, and measuring rods are inserted through the perforations.

[0010] The measuring rod is a metal threaded rod, with nuts fitted at both ends. Nuts are also installed on both sides of each side plate, and the nuts clamp the side plates from both sides.

[0011] The surface of the 3D-printed seat SIP point calibration device is polished with 600-grit polishing abrasive.

[0012] A method for measuring seat SIP points using a seat SIP point calibration device includes the following steps:

[0013] S1. Adjust the position of the tractor seat to ensure that the seat is straight and not tilted.

[0014] S2. Place the prepared seat SIP point calibration device in the middle of the seat, and add a counterweight to the base plate of the seat SIP point calibration device;

[0015] S3. Prepare two laser levels, A and B. Laser level B emits two perpendicularly intersecting vertical and horizontal planes to determine the horizontal and vertical planes in space where the seat SIP point is located.

[0016] S4. Laser level A emits two perpendicularly intersecting vertical and horizontal planes, which can determine the horizontal and horizontal planes in space where the SIP point is located.

[0017] S5. The spatial position of the seat SIP point is determined by the intersection of the horizontal plane, longitudinal vertical plane and transverse vertical plane of laser level A and B.

[0018] The beneficial effects of this invention are as follows: The purpose of this invention is to provide a novel method for 3D printing a seat SIP point calibration device and a method for accurately measuring seat SIP points using a specific material, photosensitive resin. The selected material can simultaneously meet the standard requirements for the device's volume and weight. The seat SIP point calibration device is simple to manufacture through one-piece molding, and its accuracy meets or even exceeds the standard requirements for measuring devices. It is robust, durable, and will not deform or crack during later use. It directly measures and marks the position of the seat SIP points, facilitating the placement of the seat replacement device in the next step. The overall manufacturing cost is low, and the measurement and marking of seat SIP points is quick and easy. Attached Figure Description

[0019] Figure 1 This is a schematic diagram for measuring the SIP point of the seat.

[0020] Figure 2 This is a schematic diagram of the seat SIP point calibration device.

[0021] Labels in the diagram: 1. Seat; 2. Seat SIP point calibration device; 3. Seat SIP point; 4. Seat base; 5. Laser level A; 6. Level beam; 7. Counterweight; 8. Laser level B; 9. SIP point calibration device; 91. Base plate; 92. Back plate; 93. Side wing plate; 94. Rib plate; 95. Measuring rod. Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The contents not described in detail in the embodiments of the present invention are prior art known to those skilled in the art.

[0023] Example 1: Tractors are off-highway vehicles, belonging to engineering vehicles, and are mainly used in agriculture, forestry, industry and other fields. Due to the complex road conditions, harsh working environment, large deviation of the vehicle's center of gravity during operation, and a significant decrease in the ability to maintain balance, tractor rollover accidents occur frequently, seriously threatening the lives of drivers. Furthermore, engineering vehicles are relatively heavy, and the fatal injury rate to drivers caused by rollover accidents is very high.

[0024] Currently, with the rapid development of agricultural mechanization and the continuous implementation of national agricultural machinery subsidy policies, the tractor industry is developing rapidly. Tractors are evolving towards higher power, multiple gears, automatic control, power shifting, and improved driving comfort and safety. Simultaneously, relevant safety regulations for tractors are being enforced. Numerous international statistics show that during tractor-based agricultural and forestry operations, driver injuries and fatalities due to rollovers account for approximately 70% of all agricultural machinery-related accidents. This underscores the critical importance of the safety performance of tractor safety devices.

[0025] Therefore, testing the safety performance of tractor safety guards is of paramount importance, as it directly determines the qualification of the guards and is related to the lives of tractor drivers. In the testing of tractor safety guards, the security of the safety enclosure directly affects the success of the test, and the placement of the safety enclosure is determined by the SIP (Safety Intake Point).

[0026] Typically, seat SIP point calibration devices are fabricated by the testing unit based on drawings provided by the manufacturer. Common fabrication methods include wood carving or metal sheet welding, followed by indirect measurement using a steel tape measure or ruler. Wooden or metal seat SIP point calibration devices are difficult to meet standard requirements for size and weight, and their fabrication is complex, time-consuming, and labor-intensive.

[0027] To address the aforementioned issues, this invention provides a seat SIP point calibration device manufactured using 3D printing of polymer materials. This device can simultaneously meet the standard requirements for device size and weight, is simple to manufacture through one-piece molding, and its accuracy meets or even exceeds the standard requirements for measuring devices. It is also robust, durable, and will not deform or crack during later use.

[0028] Specifically, such as Figure 2 As shown, based on the drawings of the seat SIP point calibration device provided by the tractor manufacturer, a high polymer material was selected. According to the actual production test, the selected high polymer material was photosensitive resin. The seat SIP point calibration device was directly printed in one piece by a 3D printer. The surface of the printed seat SIP point calibration device needs to be polished with 600-grit polishing abrasive to ensure that the surface of the seat SIP point calibration device is smooth and to avoid affecting the accuracy during measurement.

[0029] The seat SIP point calibration device includes a base plate, a back plate, and side wing plates. A V-shaped notch is provided in the middle of the front end of the base plate. The back plate is vertically installed on the rear side of the base plate. The side wing plates are located at both ends of the back plate. A stiffening plate is also provided between the base plate and the back plate. The stiffening plate is located in the center of the base plate and the back plate. Symmetrical perforations are provided on the side wing plates, and measuring rods are inserted through the perforations.

[0030] For a standard seat SIP point calibration device, the position of the SIP point has been pre-measured and marked on the measuring rod. When using the seat SIP point calibration device to measure the tractor seat SIP point, it is necessary to simulate the driver's riding state, mark the position of the seat SIP point in the riding state according to the SIP point on the seat SIP point calibration device, and mark the seat SIP point with the corresponding marking device.

[0031] This invention uses two laser levels, A and B, facing each other from different directions to make marks. By utilizing the intersection of the laser beams, the SIP point is highlighted through the superposition of the beams at the intersection point.

[0032] The light emitted by a laser level is visible light. When the light rays intersect and overlap, the brightness of the intersection point increases significantly due to superposition, which can be seen directly with the naked eye. Therefore, the intersection point of the A and B rays of the laser level is very obvious and easy to judge.

[0033] Furthermore, the SIP point calibrated by the intersection of the laser levels A and B is a virtual point. With laser levels A and B stationary, the calibrated SIP point is unaffected by physical interference, exhibiting good stability. When the tractor remains fixed and laser levels A and B are stationary, disassembling and reassembling components on the tractor will not cause the calibrated SIP point to shift, facilitating subsequent calibration and testing of the tractor.

[0034] like Figure 1 As shown, the specific measurement steps for the seat SIP point are as follows:

[0035] S1. Adjust the position of the tractor seat to ensure that the seat is straight and not tilted.

[0036] S2. Place the prepared seat SIP point calibration device in the middle of the seat, and add a counterweight to the base plate of the seat SIP point calibration device.

[0037] S3. Prepare two laser levels, A and B. Laser level B emits two perpendicularly intersecting vertical and horizontal planes to determine the horizontal and vertical planes in space where the seat SIP point is located.

[0038] S4. The laser level A emits two perpendicularly intersecting vertical and horizontal planes, which can determine the horizontal and horizontal planes in space where the SIP point is located.

[0039] In steps S3 and S4, the laser level A and B can be adjusted to be directly aligned with the determined SIP point from different angles. During the adjustment process, the laser level actively avoids the obstruction of the tractor housing, so that the calibration light is directly aligned with the SIP point. This eliminates the need to extend the measurement point outwards and measure step by step as in the traditional measurement method, which can greatly reduce measurement errors.

[0040] S5. The spatial position of the seat SIP point is determined by the intersection of the horizontal plane, longitudinal vertical plane and transverse vertical plane of laser level A and B.

[0041] S6. Keeping the laser level A and B in place, remove the seat SIP point calibration device and tractor seat, install the seat replacement device, and mark the SIP point on the seat replacement device according to the intersection of the laser level A and B.

[0042] The SIP points marked by the laser level can be directly observed, and the intersection of light rays will not be affected by external physical interference, making it easier to adjust or replace the seat later.

Claims

1. A method for measuring seat SIP points using a seat SIP point calibration device, characterized in that, Includes the following steps: S1. Adjust the position of the tractor seat to ensure that the seat is straight and not tilted. S2. A seat SIP point calibration device is fabricated using 3D printing technology. The seat SIP point calibration device is integrally molded from photosensitive resin material, and the surface of the printed seat SIP point calibration device is polished with 600-grit polishing abrasive. The seat SIP point calibration device includes a base plate, a back plate, and side wing plates. A V-shaped notch is set in the middle of the front end of the base plate. The back plate is vertically installed on the rear side of the base plate, and the side wing plates are set at both ends of the back plate. A stiffening plate is also set between the base plate and the back plate, and the stiffening plate is located in the center of the base plate and the back plate. Symmetrical perforations are set on the side wing plates, and metal threaded measuring rods are inserted through the perforations. Nuts are fitted at both ends of the metal threaded measuring rods. Nuts are installed on both sides of each side wing plate, and the nuts clamp the side wing plates from both sides. The positions of the SIP points are pre-measured and marked on the metal threaded measuring rods. The fabricated seat SIP point calibration device is placed in the middle of the seat, and a counterweight is added to the base plate of the seat SIP point calibration device. The positions of the seat SIP points in the sitting state are marked according to the SIP points on the seat SIP point calibration device. S3. Prepare two laser levels, A and B, facing each other from different directions. Laser level B emits two perpendicularly intersecting vertical and horizontal planes to determine the horizontal and vertical planes in space where the seat SIP point is located. S4. Laser level A emits two perpendicularly intersecting vertical and horizontal planes, which can determine the horizontal and horizontal planes in space where the SIP point is located. In steps S3 and S4, the positions of laser level A and B are adjusted so that the laser level actively avoids the obstruction of the tractor housing and the calibration light is directly facing the SIP point. S5. The spatial position of the seat SIP point is determined by the intersection of the horizontal plane, vertical plane and transverse vertical plane of laser level A and B. The brightness of the intersection point is significantly increased by superposition of the laser light rays, highlighting a virtual point in visible light that is not affected by the physical object. S6. Keeping the laser level A and B in place, remove the seat SIP point calibration device and tractor seat. At this time, the calibrated virtual point will not shift. Install the seat replacement device and mark the SIP point on the seat replacement device according to the intersection of the laser level A and B.

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