Auxiliary tool for measuring form and location tolerance of steel gate and embedded part

Abstract

The invention relates to the technical field of hydraulic engineering, in particular to an auxiliary tool for measuring form and location tolerance of a steel gate and an embedded part, the auxiliary tool comprises a magnetic base, a scale rod, a limiter, a suspension wire device, a positioning nut, a suspension wire hammer and a scribing device, the top of the magnetic base is provided with a threaded hole, the bottom of the scale rod is provided with a screw rod, and the screw rod is screwed into the threaded hole of the magnetic base and fixed; the limiting stopper is sleeved on the scale rod in a sliding manner, and is screwed and limited through the positioning nut; the wire suspension device is slidably sleeved on the scale rod, freely rotates by taking the scale rod as a center, and is fixed at a certain position of the scale rod through the limiter; screw holes are formed in the tops of the suspension wire device and the scale rod and used for being matched with the suspension wire fixing nut to install and fix the suspension wire; threaded holes which are the same as the threaded holes in the top of the magnetic base are formed in the top of the plumb bob and the top of the scribing device and used for screwing a screw at the bottom of the scale rod.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy projects, in particular to an auxiliary tool for measuring the shape and position tolerances of steel gates and embedded parts. Background Art

[0002] Metal structures are crucial components of hydraulic engineering construction, typically including steel gates for retaining water, embedded metal components such as main rails and counterrails that guide the gates as they move up and down, penstocks for discharging water, and winch-type hoists for opening and closing the gates. Since steel gates primarily function to release and retain water from hydraulic structures, the manufacturing dimensions and geometric tolerances of these gates and embedded components are crucial. For example, quality parameters such as the straightness of the gate body, planar distortion of the gate body, the straightness of the working surfaces of embedded metal components, installation verticality, and the inclination of the gate bottom edge are crucial inspection parameters during both factory manufacturing and on-site installation, requiring strict control. For example, if the installation verticality of embedded metal components does not meet standard requirements, the gate is prone to malfunctions such as deflection, jamming, and leakage during operation. If gate distortion and bottom edge inclination do not meet standard requirements, the gate will not be able to effectively retain water.

[0003] When testing units and manufacturing units conduct quality inspections on steel gates and embedded parts, they often use rulers in conjunction with auxiliary tools such as hanging wires, pads, and heavy hammers to measure geometric dimensional parameters such as straightness, verticality, and flatness. Since there is no unified standard for hanging wires and pads as auxiliary tools, the use of auxiliary tools by various manufacturing units and testing units at the inspection site is relatively chaotic. Hanging wires and pads are usually made from local materials on site. Hanging wires use steel wire, fishing line, or cotton thread, while pads use standard parts such as bolts and nuts, or steel bars, welding rods, etc. This practice is not only non-standard in form, but also has the problem of large errors in the measurement results due to deviations in the pad base. Therefore, there is an urgent need to use a dedicated measurement auxiliary tool to inspect the geometric dimensions of steel gates and embedded parts. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and to propose an auxiliary tool for measuring the shape and position tolerances of steel gates and embedded parts.

[0005] In order to achieve the above object, the technical solutions specifically adopted by the present invention are as follows:

[0006] An auxiliary tooling for measuring the form and position tolerances of steel gates and embedded parts, comprising a magnetic base, a scale rod, a limiter, a hanging wire device, a positioning nut, a hanging wire bob, and a marking device. A threaded hole is provided on the top of the magnetic base, and a screw is provided at the bottom of the scale rod, which is screwed into the threaded hole of the magnetic base and fixed; the limiter is slidably mounted on the scale rod and is tightened to a limit by the positioning nut; the hanging wire device is slidably mounted on the scale rod, freely rotates with the scale rod as the center, and is fixed to a certain position on the scale rod by the limiter; screw holes are provided on the top of the hanging wire device and the scale rod for cooperating with the hanging wire fixing nut to install and fix the hanging wire; the tops of the hanging wire bob and the marking device are both provided with the same threaded holes as the top of the magnetic base for screwing into the screw at the bottom of the scale rod.

[0007] Furthermore, the ruler rod is provided with scales, and the minimum interval between the scales is 1 mm.

[0008] Furthermore, the limiter is a C-shaped frame with upper and lower through holes respectively provided on the upper and lower parts. An inner through hole adapted to the outer diameter of the scale rod is provided in the middle of the hanging wire device. The scale rod passes through the upper through hole, the inner through hole and the lower through hole in sequence, so that the limiter and the hanging wire device can move up and down along the scale rod, and the hanging wire device is located in the center of the limiter.

[0009] Furthermore, a threaded hole adapted to the positioning nut is provided on the back of the limiter, and a groove is provided on the side of the scale rod corresponding to the back of the limiter. After the positioning nut is tightened, its top is inserted into the bottom of the groove to prevent the limiter from rotating.

[0010] Furthermore, the auxiliary tooling for measuring the form and position tolerances of steel gates and embedded parts of the present invention, when used for measuring the straightness of gate main rails or counter-rail embedded parts, uses two sets of auxiliary tooling assembled from a magnetic base, a scale rod, a stopper, a hanging wire device, and a positioning nut, and includes the following steps:

[0011] Pass one end of the hanging wire through the middle hole of the hanging wire fixing nut, and screw the hanging wire fixing nut into the screw hole at the top of the hanging wire device of a set of auxiliary tooling, and tighten it until the hanging wire is naturally fixed; fix the magnetic base of the auxiliary tooling at the starting end of the embedded part's measured surface, arrange another set of auxiliary tooling at the other end of the embedded part's measured surface, and fix the other end of the hanging wire to the hanging wire device of the auxiliary tooling;

[0012] Adjust the magnetic bases of the two sets of auxiliary tooling to tighten the suspension wire, and adjust the position of the limiter on the scale rod through the positioning nut so that the limiters of the two sets of auxiliary tooling are at the same scale position; at this time, the surveyor uses a steel ruler to measure the distance D from each measuring point on the measured surface of the embedded part to the suspension wire, and the straightness of the measured surface can be obtained by subtracting the minimum distance D value from the maximum distance D value.

[0013] Furthermore, the auxiliary tooling for measuring the form and position tolerances of steel gates and embedded parts of the present invention is used to measure the verticality of the gate main rail or counter-rail embedded parts. The auxiliary tooling is assembled into a set of auxiliary tooling consisting of a magnetic base, a scale rod, a limiter, a hanging wire device, and a positioning nut, and includes the following steps:

[0014] Pass the hanging wire through the middle hole of the hanging wire fixing nut, screw the hanging wire fixing nut into the screw hole at the top of the hanging wire device, and tighten it until the hanging wire is naturally fixed;

[0015] Take another ruler rod, screw the screw at the bottom of the ruler rod into the screw hole at the top of the plumb bob and tighten it. Pass the other end of the plumb line through the middle hole of the fixing nut, and screw the plumb line fixing nut into the screw hole at the top of the ruler rod. Tighten it until the plumb line is naturally fixed.

[0016] Fix the magnetic base to the measured surface at the upper end of the embedded part, adjust the limiter to a certain scale and tighten it with the positioning nut; slowly lower the plumb bob from the upper end of the embedded part to the lower end of the embedded part, and the plumb bob will tighten the hanging wire under the action of gravity;

[0017] At this time, the surveyor uses a steel ruler to measure the distance D from each measuring point on the measured surface of the embedded part to the hanging line. The verticality of the measured surface can be obtained by subtracting the minimum distance D value from the maximum distance D value.

[0018] Furthermore, the auxiliary tooling for measuring the form and position tolerances of steel gates and embedded parts of the present invention uses 4 sets of auxiliary tooling assembled by a magnetic base, a scale rod, a limiter, a hanging wire device, and a positioning nut when used for measuring the distortion of the gate body or embedded parts; the 4 sets of auxiliary tooling are respectively placed at the four corners ABCD of the gate or embedded parts in a flat state, wherein the hanging wire devices of the auxiliary tooling at the A and C angle positions are connected with hanging wires, and the position of the magnetic base is adjusted to tighten the hanging wires, and the hanging wires of the auxiliary tooling at the B and D angle positions are arranged according to the hanging wires of the A and C angles. Method setting, adjust the limiters of the auxiliary tooling at the four corners ABCD respectively so that their heights on the ruler rod are equal. At this time, the AB hanging line and the CD hanging line intersect at point O; if the four points ABCD are all on the same plane, that is, the gate or embedded part is straight and there is no distortion, the AB hanging line and the CD hanging line contact each other at point O, and the distance is 0; if the four points ABCD are not on the same plane, that is, the gate or embedded part is distorted, there is a gap L between the AB hanging line and the CD hanging line at point O. The length of L measured with a steel ruler is the distortion value of the gate body.

[0019] Furthermore, the auxiliary tooling for measuring the form and position tolerances of steel gates and embedded parts of the present invention, when used for measuring the inclination of the bottom edge of the gate body, uses a reference device composed of a magnetic base, a scale rod, two stoppers, two hanging wire devices, and hanging wire fixing nuts; a marking device composed of a scale rod, a marking device, two stoppers, two hanging wire devices, and hanging wire fixing nuts, and two hanging wires of the same length are used to connect the marking device and the reference device to ensure relative parallelism between the marking device and the reference device;

[0020] When measuring the inclination of the bottom edge of the gate body, the gate is in a flat state. Assuming that the left and right endpoints of the bottom edge of the gate are M and N respectively, the magnetic base of the reference device is fixed to any point on the center line of the gate body. The inspection personnel hold the marking device and tighten the steel wire at a certain point on the left side of the gate, so that the marking device can rotate with the reference device as the center under the constraint of the two steel wires, and can ensure that the marking device is always in a vertical state. At this time, use the marking device to draw a smaller arc line on the left side of the gate, and the arc line intersects the left side at point A; use the marking device 7 in the same way to draw a smaller arc line on the right side of the gate, and the arc line intersects the right side at point B;

[0021] After marking, use a steel ruler to measure the lengths of points AM and BN respectively. The value L, which is the length of AM minus the length of BN, is the inclination of the bottom edge of the gate.

[0022] The present invention has the following characteristics and beneficial effects:

[0023] 1) The components of the present invention are combined into devices with corresponding functions according to the requirements of the inspection site, and all inspection contents are completed in one stop, avoiding the disadvantage of temporarily finding equal-height pads or hanging objects on site during the inspection of the geometric dimensions of steel gates and embedded parts;

[0024] 2) The use process is efficient and convenient. For small and medium-sized steel gates and embedded parts, one person can complete the measurement of straightness and verticality, without the need for other personnel to assist in pulling or laying out the wires.

[0025] 3) All parts of the tooling are made of lightweight alloy and are easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0027] Figure 1 This is a front view of an auxiliary tool for measuring the form and position tolerances of steel gates and embedded parts according to an embodiment of the present invention;

[0028] Figure 2 The figure is a side view of an auxiliary tool for measuring the form and position tolerances of steel gates and embedded parts according to an embodiment of the present invention.

[0029] Figure 3 The figure is a top view of an auxiliary tool for measuring the form and position tolerances of steel gates and embedded parts according to an embodiment of the present invention.

[0030] Figure 4 Schematic diagram of the structure of the limiter in an embodiment of the present invention.

[0031] Figure 5 Schematic diagram of the structure of the hanging wire device in an embodiment of the present invention.

[0032] Figure 6 Schematic diagram of the structure of the hanging bob in an embodiment of the present invention.

[0033] Figure 7 Schematic diagram of the result of the scribing device in an embodiment of the present invention.

[0034] Figure 8 Schematic diagram of the structure of the limiter and the positioning nut in an embodiment of the present invention.

[0035] Figure 9 This is a schematic diagram of auxiliary tooling used to measure the straightness of gate bodies or embedded parts.

[0036] Figure 10 This is a schematic diagram of the auxiliary tooling used to measure the verticality of gate embedded parts.

[0037] Figure 11 Schematic diagram of the auxiliary tooling used to measure gate body distortion.

[0038] Figure 12 This is a schematic diagram of the auxiliary tooling used to measure the inclination value of the bottom edge of the gate body.

[0039] In the figure: 1-magnetic base; 2-ruler rod; 3-limiter; 4-hanging wire device; 5-positioning nut; 6-hanging wire bob; 7-marking device; 8-hanging wire fixing nut; 9-groove; 10-hanging wire. DETAILED DESCRIPTION

[0040] The present invention is described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0041] like Figures 1-8As shown, an auxiliary tool for measuring the form and position tolerances of steel gates and embedded parts according to an embodiment of the present invention includes a magnetic base 1, a scale rod 2, a limiter 3, a hanging wire device 4, a positioning nut 5, a plumb bob 6, and a marking device 7. The magnetic base 1, the scale rod 2, the limiter 3, the hanging wire device 4, and the positioning nut 5 constitute a set of auxiliary tooling. When performing form and position tolerance measurement, two or more sets of auxiliary tooling can be used in combination with the plumb bob 6 and the marking device 7.

[0042] An M8 threaded hole is provided on the top of the magnetic base 1, and an M8 screw is provided at the bottom of the scale rod 2, which can be screwed into the M8 threaded hole of the magnetic base 1 and fixed; and a scale is provided on the scale rod 2, and the minimum interval between the scales is 1mm.

[0043] The limiter 3 is a C-shaped frame, with upper and lower through holes respectively provided on the upper and lower parts. The middle part of the hanging wire device 4 is provided with an inner through hole adapted to the outer diameter of the scale rod 2. The scale rod 2 passes through the upper through hole, the inner through hole and the lower through hole in sequence, so that the limiter 3 and the hanging wire device 4 can move up and down along the scale rod 2, and the hanging wire device 4 is located in the center of the limiter 3. The hanging wire device 4 is free to rotate with the scale rod 2 as the center and is fixed to a certain position of the scale rod 2 by the limiter 3;

[0044] A threaded hole is provided on the back of the limiter 3, and a positioning nut 5 is screwed in to lock the position. A groove 9 is provided on the side of the scale rod 2 corresponding to the back of the limiter 3. After the positioning nut 5 is tightened, its top is inserted into the bottom of the groove to prevent the limiter from rotating after the positioning nut 5 is tightened.

[0045] The tops of the hanging wire device 4 and the scale rod 2 both have screw holes, which are used to install and fix the hanging wire 10 in conjunction with the hanging wire fixing nut 8. The tops of the hanging wire bob 6 and the marking device 7 are provided with M8 threaded holes which are the same as the top of the magnetic base, and can be screwed into the M8 screw at the bottom of the scale rod 2.

[0046] like Figure 9 As shown in FIG, the present invention is an auxiliary tool for measuring the shape and position tolerance of steel gates and embedded parts. When used for measuring the straightness of the gate main rail or the counter rail embedded parts, two sets of auxiliary tooling are assembled, each consisting of a magnetic base 1, a scale rod 2, a limiter 3, a hanging wire device 4, and a positioning nut 5. Figure 3As shown, it includes the following steps: passing one end of the suspension wire through the hole in the middle of the suspension wire fixing nut, and screwing the suspension wire fixing nut into the screw hole on the top of the suspension wire device of a set of auxiliary tooling, and tightening it until the suspension wire is naturally fixed; fixing the magnetic base 1 of the set of auxiliary tooling at the starting end of the embedded part to be measured, arranging another set of auxiliary tooling at the other end of the embedded part to be measured, and fixing the other end of the suspension wire on the suspension wire device of the set of auxiliary tooling; adjusting the magnetic base 1 of the two sets of auxiliary tooling to tension the suspension wire, and adjusting the position of the limiter 3 on the scale rod 2 through the positioning nut so that the limiters 3 of the two sets of auxiliary tooling are at the same scale position; at this time, the surveyor uses a steel ruler to measure the distance D from each point on the measured surface of the embedded part to the suspension wire in the measurement order from point a to point e, where, according to the SL582 specification, the two adjacent points are not more than 1 meter, and the maximum distance D value is subtracted from the minimum distance D value to obtain the straightness of the measured surface.

[0047] like Figure 10 As shown in the figure, the auxiliary tool for measuring the shape and position tolerance of steel gates and embedded parts of the present invention is used for measuring the verticality of the gate main rail or the counter rail embedded parts. Figure 4 As shown, a set of auxiliary tooling is assembled by a magnetic base 1, a ruler rod 2, a limiter 3, a hanging wire device 4, and a positioning nut 5, including the following steps: first, the hanging wire is passed through the middle hole of the hanging wire fixing nut, and the hanging wire fixing nut is screwed into the screw hole at the top of the hanging wire device 4 and tightened until the hanging wire is naturally fixed; another ruler rod 2 is taken, the screw at the bottom of the ruler rod 2 is screwed into the screw hole at the top of the hanging wire bob 6 and tightened; then, the magnetic base 1 is fixed to the measured surface at the upper end of the embedded part, the limiter 3 is adjusted to a certain scale and then tightened with the positioning nut 5; the hanging wire bob 6 is slowly lowered from the upper end of the embedded part to the lower end of the embedded part, and the hanging wire bob tensions the hanging wire under the action of gravity; at this time, the surveyor uses a steel ruler to measure the distance D from the measured surface of the embedded part to the hanging wire in the order from point a to point c. According to the SL582 specification, the distance between two adjacent points is not more than 1 meter. The verticality of the measured surface can be obtained by subtracting the minimum distance D from the maximum distance D value.

[0048] like Figure 11 As shown in the figure, the auxiliary tool for measuring the shape and position tolerance of steel gates and embedded parts of the present invention is used for measuring the distortion of gate bodies or embedded parts. Figure 5As shown, four sets of auxiliary fixtures are assembled, each consisting of a magnetic base 1, a scale rod 2, a stopper 3, a suspension wire device 4, and a positioning nut 5. The four sets of auxiliary fixtures are placed at the four corners, ABCD, of the horizontally placed gate or embedded component. The suspension wire devices of the auxiliary fixtures at corners A and C are connected by suspension wires. The position of the magnetic base 1 is adjusted to tighten the suspension wires. The suspension wires of the auxiliary fixtures at corners B and D are arranged according to the arrangement of the suspension wires at corners A and C. The stoppers of the auxiliary fixtures at corners ABCD are adjusted so that their heights on the scale rod 2 are equal. At this point, the suspension wires AB and CD intersect at point O. If the four points ABCD are all in the same plane, meaning the gate or embedded component is straight and free of distortion, the suspension wires AB and CD touch each other at point O, with a distance of 0. If the four points ABCD are not in the same plane, meaning the gate or embedded component is distorted, a gap L exists between the suspension wires AB and CD at point O. The length of L, measured with a steel ruler, is the gate distortion value.

[0049] like Figure 12 As shown in the figure, the auxiliary tool for measuring the shape and position tolerance of steel gates and embedded parts of the present invention is used to measure the inclination of the bottom edge of the gate body. Figure 6 As shown, a reference device is assembled from a magnetic base 1, a scale rod 2, two stoppers 3, two suspension wire devices 4, and suspension wire fixing nuts; a marking device is assembled from a scale rod, a marking device 7, two stoppers, two suspension wire devices, and suspension wire fixing nuts. Two suspension wires of equal length are used to connect the marking device and the reference device to ensure relative parallelism between the marking device and the reference device.

[0050] When measuring the inclination of the bottom edge of the gate body, the gate is in a flat state. Assuming that the left and right endpoints of the bottom edge of the gate are M and N respectively, the magnetic base 1 of the reference device is fixed to any point on the center line of the gate body. The inspection personnel hold the marking device and tighten the steel wire at a certain point on the left side of the gate, so that the marking device 7 can rotate with the reference device as the center under the constraint of the two steel wires, and can ensure that the marking device is always in a vertical state. At this time, use the marking device 7 to draw a smaller arc line on the left side of the gate, and the arc line intersects the left side at point A; use the same method to draw a smaller arc line on the right side of the gate with the marking device 7, and the arc line intersects the right side at point B; after completing the marking, use a steel ruler to measure the length of points AM and BN respectively. The value L of the length of AM minus the length of BN is the inclination of the bottom edge of the gate.

[0051] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary tool for measuring the shape and position tolerance of steel gates and embedded parts, characterized by: The invention comprises a magnetic base (1), a scale rod (2), a stopper (3), a hanging wire device (4), a positioning nut (5), a hanging wire bob (6), and a marking device (7). The top of the magnetic base (1) is provided with a threaded hole, and the bottom of the scale rod (2) is provided with a screw rod, which is screwed into the threaded hole of the magnetic base (1) and fixed; the stopper (3) is slidably mounted on the scale rod (2) and is tightened and limited by the positioning nut; the hanging wire device (4) is slidably mounted on the scale rod (2), freely rotates around the scale rod (2), and is fixed to a certain position of the scale rod (2) by the stopper (3); the tops of the hanging wire device (4) and the scale rod (2) are both provided with screw holes for cooperating with the hanging wire fixing nut (8) to install and fix the hanging wire (10); the tops of the hanging wire bob (6) and the marking device (7) are both provided with the same threaded hole as the top of the magnetic base, for screwing into the screw rod at the bottom of the scale rod (2).

2. The auxiliary tool for measuring the shape and position tolerance of steel gates and embedded parts according to claim 1, characterized in that: The scale rod (2) is provided with scales, and the minimum interval between the scales is 1 mm.

3. The auxiliary tool for measuring the shape and position tolerance of steel gates and embedded parts according to claim 1, characterized in that: The stopper (3) is a C-shaped frame, with an upper through hole and a lower through hole respectively provided on the upper and lower parts. An inner through hole adapted to the outer diameter of the scale rod (2) is provided in the middle of the hanging wire device (4). The scale rod (2) passes through the upper through hole, the inner through hole, and the lower through hole in sequence, so that the stopper (3) and the hanging wire device (4) can move up and down along the scale rod (2), and the hanging wire device (4) is located in the center of the stopper (3).

4. The auxiliary tool for measuring the shape and position tolerance of steel gates and embedded parts according to claim 1, characterized in that: The back of the limiter (3) is provided with a threaded hole adapted to the positioning nut, and the side of the scale rod (2) corresponding to the back of the limiter (3) is provided with a groove, and after the positioning nut is tightened, its top is inserted into the bottom of the groove to prevent the limiter from rotating.

5. The auxiliary tool for measuring the shape and position tolerance of steel gates and embedded parts according to claim 1, characterized in that: When used for measuring the straightness of the gate main rail or the counter rail embedded parts, two sets of auxiliary tooling are used, each of which is assembled from a magnetic base (1), a scale rod (2), a stopper (3), a hanging wire device (4), and a positioning nut (5), including the following steps: Pass one end of the hanging wire through the middle hole of the hanging wire fixing nut, and screw the hanging wire fixing nut into the screw hole at the top of the hanging wire device of a set of auxiliary tooling, and tighten it until the hanging wire is naturally fixed; fix the magnetic base (1) of the set of auxiliary tooling at the starting end of the embedded part to be measured, arrange another set of auxiliary tooling at the other end of the embedded part to be measured, and fix the other end of the hanging wire to the hanging wire device of the set of auxiliary tooling; The magnetic bases 1 of the two sets of auxiliary tooling are adjusted to tighten the suspension wires, and the positions of the limiters (3) on the scale rod (2) are adjusted by the positioning nuts so that the limiters (3) of the two sets of auxiliary tooling are at the same scale position; at this time, the surveyor uses a steel ruler to measure the distance D from each measuring point on the measured surface of the embedded part to the suspension wire, and the straightness of the measured surface can be obtained by subtracting the minimum distance D from the maximum distance D.

6. The auxiliary tool for measuring the shape and position tolerance of steel gates and embedded parts according to claim 1, characterized in that: When used for measuring the verticality of the gate main rail or the counter rail embedded parts, a set of auxiliary tooling is assembled from a magnetic base (1), a scale rod (2), a stopper (3), a hanging wire device (4), and a positioning nut (5), including the following steps: Pass the suspension wire through the middle hole of the suspension wire fixing nut, screw the suspension wire fixing nut into the screw hole at the top of the suspension wire device (4), and tighten until the suspension wire is naturally fixed; Take another ruler rod (2), screw the screw rod at the bottom of the ruler rod (2) into the screw hole at the top of the plumb bob (6) and tighten it to fix it. Pass the other end of the plumb line through the hole in the middle of the fixing nut, and screw the plumb line fixing nut into the screw hole at the top of the ruler rod (2), and tighten it until the plumb line is naturally fixed. Fix the magnetic base (1) on the measured surface at the upper end of the embedded part, adjust the limiter 3 to a certain scale and tighten it with the positioning nut (5); slowly lower the plumb bob (6) from the upper end of the embedded part to the lower end of the embedded part, and the plumb bob tightens the hanging wire under the action of gravity; At this time, the surveyor uses a steel ruler to measure the distance D from each measuring point on the measured surface of the embedded part to the hanging line. The verticality of the measured surface can be obtained by subtracting the minimum distance D value from the maximum distance D value.

7. The auxiliary tool for measuring the shape and position tolerance of steel gates and embedded parts according to claim 1, characterized in that: When used for measuring the distortion of a gate body or embedded parts, four sets of auxiliary tooling are used, which are respectively assembled from a magnetic base (1), a scale rod (2), a stopper (3), a hanging wire device (4), and a positioning nut (5); the four sets of auxiliary tooling are respectively placed at the four corners ABCD of the gate or embedded parts in a horizontal state, wherein the hanging wire devices of the auxiliary tooling at the A and C angle positions are connected with hanging wires, and the position of the magnetic base (1) is adjusted to tighten the hanging wires, and the hanging wires of the auxiliary tooling at the B and D angle positions are arranged according to the arrangement method of the hanging wires at the A and C angles, and are respectively adjusted. Adjust the limiters of the auxiliary fixtures at the four corners ABCD so that their heights on the ruler rod (2) are equal. At this time, the AB hanging line and the CD hanging line intersect at point O. If the four points ABCD are all on the same plane, that is, the gate or embedded part is straight and there is no distortion, the AB hanging line and the CD hanging line contact each other at point O, and the distance is 0. If the four points ABCD are not on the same plane, that is, the gate or embedded part is distorted, there is a gap L between the AB hanging line and the CD hanging line at point O. The length of L measured with a steel ruler is the gate body distortion value.

8. The auxiliary tool for measuring the shape and position tolerance of steel gates and embedded parts according to claim 1, characterized in that: When used for measuring the inclination of the bottom edge of the gate body, a reference device is used, which is composed of a magnetic base (1), a scale rod (2), two stoppers (3), two hanging wire devices (4), and hanging wire fixing nuts; a marking device is combined with a scale rod, a marking device (7), two stoppers, two hanging wire devices, and hanging wire fixing nuts, and the marking device and the reference device are connected by two hanging wires of the same length to ensure that the marking device and the reference device are relatively parallel; When measuring the inclination of the bottom edge of the gate body, the gate is in a flat state. Assuming that the left and right endpoints of the bottom edge of the gate are M and N respectively, the magnetic base (1) of the reference device is fixed at any point on the center line of the gate body. The inspection personnel hold the marking device and tighten the steel wire at a certain point on the left side of the gate, so that the marking device (7) can rotate with the reference device as the center under the constraint of the two steel wires, and can ensure that the marking device is always in a vertical state. At this time, use the marking device (7) to draw a smaller arc line on the left side of the gate, and the arc line intersects the left side at point A; use the marking device (7) in the same way to draw a smaller arc line on the right side of the gate, and the arc line intersects the right side at point B; After marking, use a steel ruler to measure the lengths of points AM and BN respectively. The value L, which is the length of AM minus the length of BN, is the inclination of the bottom edge of the gate.

Images