A positioning device for a steel net rack welded ball and a positioning method of a welded ball net rack

Abstract

The present application relates to a kind of positioning device for steel net frame welded ball and welded ball net frame positioning method, and positioning device includes arc plate, horizontal angle positioning mechanism and distance positioning mechanism;Arc plate surface is equipped with scale line, horizontal angle positioning mechanism is fixedly installed in one end of arc plate, and distance positioning mechanism is installed on arc plate and can slide along arc plate;Horizontal angle positioning mechanism is equipped with horizontal scale disc with pointer, and horizontal angle positioning mechanism can adjust length along the radial direction of arc plate;Laser range finder is installed in one end of distance positioning mechanism, and the distance between the other end of distance positioning mechanism and the center of arc plate is adjustable.Welded ball is positioned using the positioning device designed in the present application, and it is not necessary to establish complete ground right-angle coordinate axis network, and it is not necessary to determine elevation by means of total station or level, so that the requirement to construction personnel is reduced, construction progress is accelerated, and construction cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of steel structure construction, and specifically to a positioning device and method for positioning welded spheres in a steel space frame. Background Technology

[0002] Welded spherical steel space frames are a common type of steel space frame structure in the construction industry. They are formed by connecting welded spheres and members to create a spatial space frame structure. Common construction methods for steel space frames include high-altitude assembly, segmented installation, overall hoisting, and overall lifting. The first two methods require high-altitude welding, which necessitates extremely precise positioning and verification of the welded sphere nodes and members. This requires the use of equipment such as total stations for high-altitude measurement and positioning of the members, and welding can only proceed after complete dimensional verification. Due to the unstable environment at high altitudes, significant positioning deviations and inconsistent welding quality can still occur. Therefore, the latter two methods involve positioning and welding the spheres and members on the ground, which is easier to operate compared to high-altitude work.

[0003] When assembling a welded spherical space frame on the ground, the current practice typically involves first establishing a complete rectangular coordinate grid on the ground. The position of the welded spheres within this grid is then determined, and a total station or level is used for positioning. While establishing a coordinate grid on the ground is relatively simple, it requires on-site construction personnel to calibrate the grid position after each construction phase or after a period of time to ensure accurate positioning of the welded members. Therefore, the traditional welded spherical space frame construction method requires a surveyor skilled in operating surveying instruments to determine the position of the welded spheres and calibrate the grid position, placing high technical demands on on-site construction personnel. Furthermore, determining the position of the welded spheres using the grid requires calculations based on existing steel structure drawings; due to the large number of components in the space frame structure, calculation errors are inevitable. In summary, the traditional method of positioning welded spheres is cumbersome, involves numerous procedures, and presents significant challenges in controlling the positioning accuracy of member assembly, placing high technical demands on on-site construction personnel. Summary of the Invention

[0004] This invention first discloses a positioning device for welding spheres in steel space frames. It eliminates the need to establish a complete ground rectangular coordinate axis network, omits the axis network calibration step, and does not require professional surveyors, thereby accelerating the construction progress and reducing construction costs.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A positioning device for welding spheres in a steel space frame includes an arc-shaped plate, a horizontal angle positioning mechanism, and a distance positioning mechanism. The arc-shaped plate is cut from a portion of the arc of a circular ring, and the surface of the arc-shaped plate is provided with scale lines. The horizontal angle positioning mechanism is fixedly installed at one end of the arc-shaped plate, and the distance positioning mechanism is installed on the arc-shaped plate and can slide along the arc of the arc-shaped plate. Both the horizontal angle positioning mechanism and the distance positioning mechanism are long rods, and the centerline of the horizontal angle positioning mechanism and the centerline of the distance positioning mechanism in the length direction can intersect at the center of the arc-shaped plate. The horizontal angle positioning mechanism is provided with a horizontal scale with a pointer, and the length of the horizontal angle positioning mechanism can be adjusted along the radius direction of the arc-shaped plate. A laser rangefinder is installed at the end of the distance positioning mechanism away from the center of the arc-shaped plate, and the distance between the other end of the distance positioning mechanism and the center of the arc-shaped plate is adjustable.

[0007] Furthermore, a groove is formed on the surface of the arc-shaped plate, and a slider is provided in the distance positioning mechanism. The slider is embedded in the groove, and the slider slides along the groove to drive the distance positioning mechanism to move.

[0008] Furthermore, a friction sponge is provided on the outer surface of the slider where it contacts the groove.

[0009] Furthermore, the horizontal angle positioning mechanism includes an elastic support, a middle sleeve, and a height adjustment rod; one end of the elastic support is a suction cup, and the other end is a hollow support rod; the middle sleeve has an internal thread, one end of the height adjustment rod is a threaded rod, the other end is a smooth rod, a scale rod is between the smooth rod and the threaded rod, and a height adjustment knob is provided between the scale rod and the smooth rod; the threaded rod and the scale rod of the height adjustment rod are embedded in the middle sleeve, the smooth rod of the height adjustment rod is inserted into the support rod of the elastic support, the middle sleeve is fixedly connected to the arc plate, the horizontal scale is installed on the middle sleeve, and the suction cup is located on the side close to the center of the arc plate.

[0010] Furthermore, the end of the middle sleeve away from the center of the arc plate extends out of the arc plate, and the end of the middle sleeve extending out of the arc plate is a smooth rod. An upper sleeve is fitted outside the smooth rod of the middle sleeve, and a leveling bubble is provided at the top of the upper sleeve.

[0011] Furthermore, the distance positioning mechanism includes a sliding support, a middle sleeve, and a height adjustment rod; the sliding support is located on the side near the center of the arc plate, one end of the height adjustment rod is a threaded rod, the other end of the height adjustment rod is a smooth rod, a scale rod is located between the smooth rod and the threaded rod, and a height adjustment knob is provided between the scale rod and the smooth rod; the middle sleeve has an opening at one end near the sliding support with an internal thread, and a laser rangefinder and a slider are installed at the other end of the middle sleeve away from the sliding support; the threaded rod and the scale rod of the height adjustment rod are embedded in the middle sleeve, and the smooth rod of the height adjustment rod is inserted into the sliding support.

[0012] Furthermore, the sliding support includes a first sleeve, a second sleeve, a ball bearing, and a snap cap. A smooth hole is formed inside the first sleeve at one end near the middle sleeve. The other end of the first sleeve is connected to the second sleeve. The second sleeve is hollow inside and has a ball bearing embedded in it. The ball bearing is partially exposed outside the second sleeve. A snap cap is provided at the end of the second sleeve away from the middle sleeve to limit the movement of the ball bearing.

[0013] Furthermore, the middle sleeve has a groove for embedding the arc plate at one end near the laser rangefinder, the slider is located above the groove, and a space for accommodating the arc plate is formed between the groove and the slider. The laser rangefinder is installed at one end of the groove, and a limiting tray is provided on the middle sleeve near the other end of the groove.

[0014] This invention also discloses a method for positioning welded ball space frame, which uses the aforementioned positioning device to position the welded balls in the space frame. The positioning method specifically includes the following:

[0015] Step 1) Obtain the design drawings of the welded ball space frame, select one welded ball from the welded balls in the drawings as the reference positioning ball, and obtain the position information of other welded balls in the space frame relative to the reference positioning ball through the reference positioning ball. The position information includes the horizontal angle value, the vertical angle value, and the distance.

[0016] Step 2) Erect a reference positioning ball frame on the ground at the construction site and fix the reference positioning ball on the frame;

[0017] Step 3) With the center of the reference positioning ball as the origin, the direction perpendicular to the ground is the Y-axis, and the two directions perpendicular to the Y-axis are the X-axis and Z-axis respectively. Place the horizontal angle positioning mechanism in the positioning device perpendicular to the ground and on top of the reference positioning ball to ensure that the arc plate in the positioning device is perpendicular to the ground.

[0018] Step 4) Based on the position information of the welding ball to be positioned relative to the reference positioning ball obtained from the design drawing, rotate the arc plate horizontally along the contact point between the horizontal angle positioning mechanism and the reference positioning ball until the pointer of the horizontal scale in the horizontal angle positioning mechanism reaches the required horizontal angle value.

[0019] Step 5) Push the distance positioning mechanism in the positioning device to slide along the arc plate until the distance positioning mechanism stops when the scale line on the arc plate is consistent with the vertical angle value;

[0020] Step 6) Turn on the laser rangefinder on the distance positioning mechanism, determine the laser receiving point that satisfies the distance between the welding ball to be positioned and the reference positioning ball, use a crane to suspend the welding ball to be positioned at the laser receiving point, and set up a frame under the welding ball to fix the welding ball.

[0021] Step 7) Repeat steps 4)-6) to complete the positioning of the remaining welding balls.

[0022] Furthermore, after step 6) is completed, the position of the welding ball is also checked, that is: the laser rangefinder is turned on again to measure the distance between the welding ball and the reference positioning ball, and the pointer of the horizontal scale on the horizontal angle positioning mechanism is checked, as well as the position of the scale line on the arc plate is checked, and the above information is checked to see if it is consistent with the obtained position information value.

[0023] The welding ball positioning device designed in this invention does not require the establishment of a complete ground rectangular coordinate axis network when positioning the welding ball, omitting the axis network calibration step. It also does not require the use of a total station or level to determine the elevation, and does not require professional surveyors. This reduces the technical skill requirements for construction personnel, and the simplification of construction steps can speed up the construction progress and reduce construction costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the welding ball positioning device in the embodiment;

[0025] Figure 2 This is a schematic diagram of the horizontal angle positioning mechanism in the positioning device;

[0026] Figure 3 for Figure 2 Exploded view of the horizontal angle positioning mechanism;

[0027] Figure 4 This is a schematic diagram of the distance positioning mechanism in a positioning device;

[0028] Figure 5 An exploded view of the distance positioning mechanism;

[0029] Figure 6 This is a diagram showing the usage state of the welding ball positioning device of the present invention.

[0030] Explanation of icon numbers:

[0031] 1. Curved plate;

[0032] 11. Scale lines; 12. Slide groove;

[0033] 2. Horizontal angle positioning mechanism;

[0034] 21. Elastic support; 22. Height adjustment knob; 23. Middle sleeve; 24. Horizontal scale; 25. Upper sleeve; 26. Height adjustment lever; 27. Leveling bubble;

[0035] 211. Suction cup; 212. Support rod; 231. First connecting rod; 232. Second connecting rod; 261. Smooth rod; 262. Scale rod; 263. Threaded rod;

[0036] 3. Distance positioning mechanism;

[0037] 31. Sliding support; 32. Height adjustment knob; 33. Middle sleeve; 34. Limiting tray; 35. Slider; 36. Laser rangefinder; 37. Height adjustment lever;

[0038] 311. First sleeve; 312. Second sleeve; 313. Ball bearing; 331. First connecting rod; 332. Internal thread; 333. Second connecting rod; 371. Smooth rod; 372. Scale rod; 373. Threaded rod;

[0039] 4. Reference positioning ball; 5. Tire frame. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0041] This embodiment first discloses a positioning device for welding balls in a steel space frame, such as... Figures 1 to 5 As shown, the entire positioning mechanism mainly consists of an arc-shaped plate 1, a horizontal angle positioning mechanism 2, and a distance positioning mechanism 3. The arc-shaped plate 1 is a segment of a circular outline, with uniformly distributed scale lines 11 on its surface. The horizontal angle positioning mechanism 2, used to measure the horizontal angle of the welding ball, is fixedly installed at one end of the arc-shaped plate 1. The distance positioning mechanism 3, used to measure the vertical angle of the welding ball, is mounted on the arc-shaped plate 1 in a sliding connection manner. The specific structures of these three parts are described below.

[0042] like Figure 2 As shown, to enable the distance positioning mechanism 3 to slide relative to the arc plate 1, a U-shaped groove 12 is provided on the surface of the arc plate 1. Scale lines 11 are distributed on the side surface of the groove 12. A slider 35 is provided on the distance positioning mechanism 3, and the slider 35 is embedded in the groove 12. Pushing the slider 35 along the groove 12 can move the distance positioning mechanism 3. When using the positioning device to position the welding ball, a welding ball position needs to be selected in advance as a reference positioning ball. The positioning device of the present invention is placed on the reference positioning ball, and the vertical angle value, horizontal angle value, and distance between the other welding balls to be positioned and the reference positioning ball are obtained in advance. The horizontal angle value is adjusted by the horizontal angle positioning mechanism 2, and the vertical angle value is adjusted by pushing the distance positioning mechanism 3 to the scale line 11 that satisfies the vertical angle value. The distance is measured by a laser rangefinder. After the vertical angle value is adjusted to the correct position, to prevent the distance positioning mechanism 3 from moving, friction sponges are provided on the outer surface of the slider 35 in this embodiment where it contacts the groove 12.

[0043] The specific structure of the horizontal angle positioning mechanism 2 is as follows: Figure 2 and Figure 3As shown, the horizontal angle positioning mechanism 2 is generally in the shape of a long strip rod, and is installed on the arc plate 1 along the radial direction of the arc plate 1. The bottom of the horizontal angle positioning mechanism 2 needs to contact the reference positioning ball when positioning the welding ball. In order to be compatible with the size of welding balls of different sizes, the length of the horizontal angle positioning mechanism 2 in this embodiment is adjustable.

[0044] Specifically, the horizontal angle positioning mechanism 2 mainly includes an elastic support 21, a height adjustment knob 22, a middle sleeve 23, a horizontal scale dial 24 with a pointer, an upper sleeve 25, a height adjustment rod 26, and a leveling bubble 27. The elastic support 21 is made of rubber and includes a suction cup 211 at the bottom and a support rod 212 connected to the suction cup 211. The support rod 212 is hollow inside and has an opening at the top. The middle sleeve 23 can be divided into a first connecting rod 231 and a second connecting rod 232 that are connected to each other. The first connecting rod 231 is hollow inside and has an opening at one end for the height adjustment rod 26 to be inserted. The inner wall of the first connecting rod 231 has internal threads. The outer diameter of the second connecting rod 232 is smaller than the outer diameter of the first connecting rod 231. The second connecting rod 232 is a smooth rod. A horizontal scale dial 24 is located at the junction of the first connecting rod 231 and the second connecting rod 232. The upper sleeve 25 is a sleeve with a smooth hole at one end. The second connecting rod 232 is inserted into the hole of the upper sleeve 25. The first connecting rod 231 is fixed on the arc plate 1, and the second connecting rod 232 extends out of the arc plate 1. After holding the upper sleeve 25, the arc plate 1 can be rotated relative to the upper sleeve 25 by hand. A leveling bubble 27 is provided at the top of the upper sleeve 25. The leveling bubble 27 can be used to help determine whether the adjustment is in place by observing whether the bubble is centered. The height adjustment rod 26 can be divided into a smooth rod 261, a scale rod 262, and a threaded rod 263 connected in sequence. A height adjustment knob 22 is provided between the scale rod 262 and the smooth rod 261. The smooth rod 261 of the height adjustment rod 26 is inserted into the support rod 212 hole of the elastic support 21. The scale rod 262 and the threaded rod 263 of the height adjustment rod 26 are embedded in the middle sleeve 23. When the length of the horizontal angle positioning mechanism 2 needs to be adjusted, the height adjustment knob 23 can be rotated. Through the engagement of the threaded rod 263 with the internal thread of the middle sleeve 23, the length of the height adjustment rod 26 embedded in the middle sleeve 23 can be changed, thereby adjusting the length of the entire horizontal angle positioning mechanism 2.

[0045] The specific structure of the distance positioning mechanism 3 is as follows: Figure 4 and Figure 5 As shown, the distance positioning mechanism 3 is also generally long and narrow, slidingly mounted on the arc plate 1 along the radial direction of the arc plate 1. The bottom of the distance positioning mechanism 3 also needs to contact the reference positioning ball during welding ball positioning. To accommodate welding balls of different sizes, the length of the distance positioning mechanism 3 in this embodiment is also adjustable.

[0046] Specifically, the distance positioning mechanism 3 mainly includes a sliding support 31, a height adjustment knob 32, a middle sleeve 33, a limiting tray 34, a slider 35, a laser rangefinder 36, and a height adjustment rod 37. The sliding support 31 includes a first sleeve 311, a second sleeve 312, a ball bearing 313, and a cover (not shown in the figure). The first sleeve 311 is hollow inside and has a smooth hole at one end. The other end of the first sleeve 311 is connected to the second sleeve 312. The outer diameter of the second sleeve 312 is larger than the outer diameter of the first sleeve 311. The second sleeve 312 is hollow inside and has a hole at the other end. The ball bearing 313 is located inside the second sleeve 312 and can roll. To prevent the ball bearing 313 from coming out of the second sleeve 312, a cover is provided at the opening end of the second sleeve 312 to limit the ball bearing 313. Part of the ball bearing 313 protrudes outside the second sleeve 312 but cannot come out. The height adjustment lever 37 can be divided into a smooth lever 371, a scale lever 372, and a threaded lever 373 connected in sequence. A height adjustment knob 32 is provided between the scale lever 372 and the smooth lever 371. The middle sleeve 33 can be divided into a first connecting rod 331 and a second connecting rod 333 connected together. The first connecting rod 331 is hollow inside and has an opening at one end. An internal thread 332 is provided on the inner wall of the opening. A circular limiting tray 34 is provided at the connection between the first connecting rod 331 and the second connecting rod 333. The second connecting rod 333 is a cylinder with a portion cut off longitudinally to form a groove that can be used to embed the arc plate 1. The top surface of the groove is flat, and a limiting wall is formed at the junction of the groove and the first connecting rod 331. A laser rangefinder 36 is fixedly installed on the outer end of the second connecting rod 333. A laser emitter and a distance display panel are provided on the outer end face of the laser rangefinder 36. A slider 35 is provided above the groove. The slider 35 is connected to the laser rangefinder 36. The distance left between the slider 35 and the groove is for the arc plate 1 to be inserted. The smooth rod 371 of the height adjustment rod 37 is inserted into the hole of the first sleeve 311 of the sliding support 31. The scale rod 372 and the threaded rod 373 of the height adjustment rod 37 are inserted into the middle sleeve 33. The height adjustment knob 32 is located outside the middle sleeve 33. When it is necessary to adjust the length of the distance positioning mechanism 3, the height adjustment knob 32 can be rotated. Through the engagement of the threaded rod 373 with the thread 332 inside the middle sleeve 33, the length of the height adjustment rod 37 embedded in the middle sleeve 33 can be changed, thereby adjusting the length of the entire distance positioning mechanism 3.

[0047] When installing the distance positioning mechanism 3, the sliding support 31 is oriented toward the center of the arc plate 1, and the arc plate 1 passes through the groove between the slider 35 and the top of the second connecting rod 333, so that the slider 35 is embedded in the groove 12 of the arc plate 1. One side of the arc plate 1 is limited by the laser rangefinder 36, and the other side of the arc plate 1 is limited by the limiting tray 34.

[0048] When using the above-mentioned positioning device to position the welded balls in the welded ball grid, such as Figure 6 As shown, the specific positioning method is explained below:

[0049] Step 1) Obtain the construction design drawings of the welded ball space frame. Select one welded ball from the welded balls in the drawings as the reference positioning ball 4. Obtain the position information of other welded balls in the space frame relative to the reference positioning ball 4 through the reference positioning ball 4. The position information includes the horizontal angle value (relative position in the XY plane), the vertical angle value (relative position in the YZ plane), and the relative straight-line distance between the two balls.

[0050] Step 2) Set up a frame 5 on the ground at the construction site to fix the reference positioning ball 4, and fix the reference positioning ball 4 on the frame 5;

[0051] Step 3) Establish a coordinate system around the reference positioning ball 4, that is: with the center of the reference positioning ball as the origin, the direction perpendicular to the ground as the Y-axis, and the two directions perpendicular to the Y-axis as the X-axis and Z-axis respectively. Place the horizontal angle positioning mechanism 2 in the positioning device vertically to the ground on top of the reference positioning ball 4. According to the size of the reference positioning ball 4, the distance between the elastic support 21 and the reference positioning ball 4 can be adjusted by rotating the height adjustment knob 22 until the suction cup 211 can stand stably on top of the reference positioning ball 4. Observe whether the bubble in the leveling bubble 27 is centered. If it is centered, it means that the horizontal angle positioning mechanism 2 has been adjusted to a vertical position. The suction cup 211 plays the role of fixing the horizontal angle positioning mechanism 2, ensuring that the arc plate 1 in the positioning device is always vertical to the ground.

[0052] Step 4) According to the position information (i.e. horizontal angle value) of the welding ball to be positioned relative to the reference positioning ball 4 obtained from the design drawing, hold the upper sleeve 25 with one hand and move the arc plate 1 with the other hand to make the arc plate 1 rotate horizontally along the contact point between the suction cup 211 and the reference positioning ball 4. Observe the pointer of the horizontal scale 24. When the pointer reaches the required horizontal angle value, stop moving the arc plate 1 horizontally.

[0053] Step 5) Rotate the height adjustment knob 32 to adjust the distance between the sliding support 31 and the surface of the reference positioning ball 4 until the ball 313 contacts the surface of the reference positioning ball 4. Push the laser rangefinder 36 by hand to make the slider 35 slide along the slide groove 12 until it reaches the position where the scale line 11 on the arc plate 1 matches the required vertical angle value.

[0054] Step 6) Turn on the laser rangefinder 36 on the distance positioning mechanism 3. The laser emitter emits laser along the preset direction to determine the laser receiving point that satisfies the distance between the welding ball to be positioned and the reference positioning ball 4. Use a crane to suspend the welding ball to be positioned at the laser receiving point and set up a frame under the welding ball to fix the welding ball.

[0055] Step 7) Check the position of the welding ball determined in Step 6), that is: turn on the laser rangefinder 36 again to measure the distance from the welding ball to the reference positioning ball 4, check the pointer of the horizontal scale 24 on the horizontal angle positioning mechanism 2, and check the position of the scale line 11 on the arc plate 1. Check whether the above information is consistent with the obtained position information value to ensure the position is accurate.

[0056] Step 8) Repeat steps 4)-7) to complete the positioning of the remaining welding balls one by one, and then the rods between the welding balls can be welded and assembled.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A positioning device for welded spheres in a steel space frame, characterized in that: It includes an arc-shaped plate, a horizontal angle positioning mechanism, and a distance positioning mechanism. The arc-shaped plate is cut from a portion of the arc of a circular ring, and its surface is marked with scale lines. The horizontal angle positioning mechanism is fixedly installed at one end of the arc-shaped plate, and the distance positioning mechanism is installed on the arc-shaped plate and can slide along the arc of the plate. Both the horizontal angle positioning mechanism and the distance positioning mechanism are long rods. The centerline of the horizontal angle positioning mechanism and the centerline of the distance positioning mechanism intersect at the center of the arc-shaped plate. The horizontal angle positioning mechanism has a horizontal scale with a pointer, and its length can be adjusted along the radius of the arc-shaped plate. A laser rangefinder is installed at the end of the distance positioning mechanism away from the center of the arc-shaped plate, and the distance between the other end of the distance positioning mechanism and the center of the arc-shaped plate is adjustable. The surface of the arc plate is provided with a sliding groove, and the distance positioning mechanism is provided with a slider. The slider is embedded in the sliding groove, and the slider slides along the sliding groove to drive the distance positioning mechanism to move. The horizontal angle positioning mechanism includes an elastic support, a middle sleeve, and a height adjustment rod. One end of the elastic support is a suction cup, and the other end is a hollow support rod. The middle sleeve has internal threads. One end of the height adjustment rod is a threaded rod, and the other end is a smooth rod. A scale rod is located between the smooth rod and the threaded rod, and a height adjustment knob is located between the scale rod and the smooth rod. The threaded rod and the scale rod of the height adjustment rod are embedded in the middle sleeve, and the smooth rod of the height adjustment rod is inserted into the support rod of the elastic support. The middle sleeve is fixedly connected to the arc plate, and a horizontal scale is installed on the middle sleeve. The suction cup is located on the side closest to the center of the arc plate. The end of the middle sleeve away from the center of the arc plate extends out of the arc plate. The end of the middle sleeve extending out of the arc plate is a smooth rod. An upper sleeve is fitted over the smooth rod of the middle sleeve, and a leveling bubble is provided at the top of the upper sleeve. The distance positioning mechanism includes a sliding support, a middle sleeve, and a height adjusting rod. The sliding support is located near the center of the arc-shaped plate. One end of the height adjusting rod is a threaded rod, and the other end is a smooth rod. A scale rod is located between the smooth rod and the threaded rod, and a height adjustment knob is located between the scale rod and the smooth rod. The middle sleeve has an opening with an internal thread at one end near the sliding support, and a laser rangefinder and a slider are installed at the other end of the middle sleeve away from the sliding support. The threaded rod and scale rod of the height adjusting rod are embedded in the middle sleeve, and the smooth rod of the height adjusting rod is inserted into the sliding support. The sliding support includes... The device includes a first sleeve, a second sleeve, a ball bearing, and a snap-on cap. The first sleeve has a smooth hole inside at one end near the middle sleeve. The other end of the first sleeve is connected to the second sleeve. The second sleeve is hollow inside and has a ball bearing embedded in it. The ball bearing is partially exposed outside the second sleeve. A snap-on cap is provided at the end of the second sleeve away from the middle sleeve to limit the ball bearing. The middle sleeve has a groove for embedding an arc-shaped plate at one end near the laser rangefinder. A slider is located above the groove, and a space for accommodating the arc-shaped plate is formed between the groove and the slider. The laser rangefinder is installed at one end of the groove, and a limiting tray is provided on the middle sleeve near the other end of the groove.

2. The positioning device for welded spheres in a steel space frame according to claim 1, characterized in that: The outer surface of the slider that contacts the groove is provided with a friction sponge.

3. A method for positioning a welded ball grid frame, characterized in that: Positioning the welded balls in the space frame using the positioning device as described in any one of claims 1-2 specifically includes the following: Step 1) Obtain the design drawings of the welded ball space frame, select one welded ball from the welded balls in the drawings as the reference positioning ball, and obtain the position information of other welded balls in the space frame relative to the reference positioning ball through the reference positioning ball. The position information includes the horizontal angle value, the vertical angle value, and the distance. Step 2) Erect a reference positioning ball frame on the ground at the construction site and fix the reference positioning ball on the frame; Step 3) With the center of the reference positioning ball as the origin, the direction perpendicular to the ground is the Y-axis, and the two directions perpendicular to the Y-axis are the X-axis and Z-axis respectively. Place the horizontal angle positioning mechanism in the positioning device perpendicular to the ground and on top of the reference positioning ball to ensure that the arc plate in the positioning device is perpendicular to the ground. Step 4) Based on the position information of the welding ball to be positioned relative to the reference positioning ball obtained from the design drawing, rotate the arc plate horizontally along the contact point between the horizontal angle positioning mechanism and the reference positioning ball until the pointer of the horizontal scale in the horizontal angle positioning mechanism reaches the required horizontal angle value. Step 5) Push the distance positioning mechanism in the positioning device to slide along the arc plate until the distance positioning mechanism stops when the scale line on the arc plate is consistent with the vertical angle value; Step 6) Turn on the laser rangefinder on the distance positioning mechanism, determine the laser receiving point that satisfies the distance between the welding ball to be positioned and the reference positioning ball, use a crane to suspend the welding ball to be positioned at the laser receiving point, and set up a frame under the welding ball to fix the welding ball. Step 7) Repeat steps 4)-6) to complete the positioning of the remaining welding balls.

4. The method for positioning a welded ball grid frame according to claim 3, characterized in that: After step 6) is completed, the position of the welding ball is checked again, that is: the laser rangefinder is turned on again to measure the distance between the welding ball and the reference positioning ball, and the pointer of the horizontal scale on the horizontal angle positioning mechanism is checked, as well as the position of the scale line on the arc plate is checked, and the above information is checked to see if it is consistent with the obtained position information value.

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