Three-coordinate measuring device convenient to position

Abstract

The invention belongs to the technical field of measuring instrument equipment, and discloses a three-coordinate measuring device convenient to position, which is technically characterized by comprising a worktable, a plurality of groups of support rods are fixedly mounted on the surface of the worktable, a top plate is fixedly mounted at the top ends of the plurality of groups of support rods, and a bearing ring is arranged between the worktable and the top plate; a height measuring instrument is arranged on the inner side wall of the bearing ring, a scanning measuring instrument is arranged on the inner side wall of the bearing ring, a measuring mechanism is arranged on the surface of the bearing ring and comprises a lifting assembly and a rotating assembly, and a positioning mechanism is arranged between the workbench and the top plate. The positioning mechanism comprises a top clamping assembly and a bottom clamping assembly, the bottom clamping assembly comprises a bottom clamping piece, a positioning part and a limiting part, and the bottom clamping assembly and the top clamping assembly are arranged to be matched with each other, so that in the whole measurement process, the positioning accuracy is improved; and the top and the bottom of the to-be-tested article can be automatically switched in sequence so as to clamp and fix the to-be-tested article.

Description

Technical Field

[0001] The invention relates to the technical field of measuring instrument equipment, in particular to a three-coordinate measuring device which is convenient for positioning. Background Art

[0002] The three-coordinate measuring device, also known as a three-coordinate measuring machine, refers to an instrument that can measure the length, width, height and other data of the geometric shape of an object and is widely used.

[0003] When measuring an object, it is generally necessary to clamp and position the object. When measuring, the existing measuring equipment has a clamp at the clamping position, which is easy to affect the measurement of the length, width, height and other data of the object. The clamping position needs to be adjusted manually multiple times, and the use effect is poor. Summary of the invention

[0004] The object of the present invention is to provide a three-coordinate measuring device that is easy to position, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A three-coordinate measuring device that is easy to position comprises a workbench, a plurality of groups of support rods are fixedly installed on the surface of the workbench, a top plate is fixedly installed on the top ends of the plurality of support rods, a bearing ring is arranged between the workbench and the top plate, a height measuring instrument is arranged on the inner side wall of the bearing ring, a scanning measuring instrument is arranged on the inner side wall of the bearing ring, a measuring mechanism is arranged on the surface of the bearing ring, the measuring mechanism comprises a lifting assembly and a rotating assembly, the lifting assembly is located between the top plate and the workbench and is connected to the bearing ring, the lifting assembly is used to control the bearing ring to move in the vertical direction, the rotating assembly is located in the bearing ring and is connected to the scanning measuring instrument, and the rotating assembly is used to control the scanning measuring instrument to move along the bearing ring The inner wall rotates, and a positioning mechanism is arranged between the workbench and the top plate, the positioning mechanism includes a top clamping assembly and a bottom clamping assembly, the top clamping assembly is located at the bottom wall of the top plate, the top clamping assembly is used to apply pressure to the top of the object to be tested, the bottom clamping assembly includes a bottom clamping piece, a positioning portion and a limiting portion, the bottom clamping piece is provided with multiple groups, the positioning portion is located in the workbench and is connected to the bottom clamping piece, the positioning portion controls the multiple groups of bottom clamping pieces to be distributed in a circular shape with equal spacing on the surface of the workbench, the limiting portion includes a first clamping piece and a second clamping piece, and the first clamping piece is used to adjust the positions of the multiple groups of bottom clamping pieces on the surface of the workbench by cooperating with the second clamping piece.

[0006] As a further solution of the present invention: the lifting assembly includes multiple groups of threaded rods distributed in a ring and rotatably installed between the top plate and the workbench, the threaded rods are threadedly connected to the load-bearing ring, and synchronous gear plates are fixedly installed on the surface of the threaded rods. Multiple groups of synchronous gear plates are commonly connected to a synchronous belt, and the top end of a group of threaded rods extends above the top plate and is connected to a first motor.

[0007] As a further solution of the present invention: the rotating component includes an annular groove provided on the inner side wall of a load-bearing ring, a sliding ring is rotatably installed in the annular groove, the sliding ring extends to the outside of the annular groove and is fixedly installed with an inner ring, the scanning measuring instrument and the height measuring instrument are respectively fixedly installed on the surface of the inner ring, a gear ring is provided on the annular side wall of the sliding ring, a control cavity connected to the annular groove is provided in the load-bearing ring, a second motor is fixedly installed on the surface of the load-bearing ring, the output shaft of the second motor extends into the control cavity and is fixedly installed with a transmission gear disc, and the transmission gear disc is meshingly connected with the gear ring.

[0008] As a further solution of the present invention: the top clamping assembly includes an extrusion spring fixedly installed on the bottom wall of the top plate, a top pressure piece is fixedly installed on the telescopic end of the extrusion spring, and multiple groups of blocking rods cooperating with the bearing ring are fixedly installed around the top pressure piece.

[0009] As a further solution of the present invention: the positioning portion includes a plurality of groups of annularly distributed telescopic cavities opened inside the workbench, a connecting groove connected to the telescopic cavity is opened downwardly on the surface of the workbench, a fixed block is slidably installed in the telescopic cavity, the bottom clamping piece is slidably installed in the fixed block along the vertical direction, and guide grooves are respectively opened on the opposite side walls of the telescopic cavity, and the guide grooves are folded line structures, and guide columns extending to the outside of the fixed block are fixedly installed on the side walls of the bottom clamping piece, and the guide columns are slidably connected to the guide grooves, and a control spring is fixedly installed on the side walls of the telescopic cavity, and the telescopic end of the control spring is connected to the fixed block.

[0010] As a further solution of the present invention: the first clamping part includes a clamping groove opened on the bottom wall of the fixed block, the bottom wall of the telescopic cavity is opened with a first telescopic groove, a first clamping column cooperating with the clamping groove is slidably installed in the first telescopic groove, a positioning spring connected to the first clamping column is fixedly installed on the bottom wall of the first telescopic groove, a wire groove connected to the first telescopic groove is opened downward on the surface of the workbench, a control rope is fixedly installed on the bottom wall of the first clamping column, one end of the control rope away from the first clamping column extends through the wire groove to the surface of the workbench and is fixedly installed with a first magnetic block, and a second magnetic block cooperating with the first magnetic block is fixedly installed on the bottom wall of the carrying ring.

[0011] As a further solution of the present invention: the second clamping part includes multiple groups of second telescopic grooves distributed in parallel on the bottom wall of the telescopic cavity, and a second clamping column that cooperates with the clamping groove is slidably installed in the second telescopic groove along the vertical direction, and a connecting rod is fixedly installed on the bottom wall of the second clamping column. Multiple groups of connecting rods extend to the bottom of the workbench and are jointly fixed with a control disk. The control disk is made of magnetic material, and a magnetic sheet that cooperates with the control disk is fixedly installed on the bottom wall of the workbench.

[0012] As a further solution of the present invention: a through hole is opened in the middle of the top plate, a vertical rod is fixedly installed on the surface of the top pressure piece, and the top end of the vertical rod extends through the through hole to above the top plate and is fixedly installed with a pull ring.

[0013] Compared with the prior art, the beneficial effect of the present invention is that by setting a bottom clamping assembly composed of a bottom clamping piece, a positioning part, and a limiting part to cooperate with a top clamping assembly, the top and bottom of the object to be measured can be automatically switched in turn during the entire measurement process to clamp and fix the object to be measured, effectively avoiding interference of the clamping position on the measurement process and effectively improving the measurement accuracy. It solves the problem that the current clamping position is easily affected by the presence of a fixture, and the clamping position needs to be adjusted manually for multiple times, resulting in poor use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of a three-dimensional structure of a three-coordinate measuring device for facilitating positioning provided in an embodiment of the present invention Figure 1 .

[0015] Figure 2 A schematic diagram of a three-dimensional structure of a three-coordinate measuring device for facilitating positioning provided in an embodiment of the present invention Figure 2 .

[0016] Figure 3 It is a schematic diagram of the main structure of a three-coordinate measuring device that is easy to position provided in an embodiment of the present invention.

[0017] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of A.

[0018] Figure 5 The present invention is a schematic diagram of a bearing ring and its connection structure in a three-coordinate measuring device that is easy to position provided in an embodiment of the present invention.

[0019] Figure 6 The present invention is a schematic diagram of a fixed block and its connection structure in a three-coordinate measuring device that is easy to position provided in an embodiment of the present invention.

[0020] Figure 7The present invention is a schematic diagram of a control panel and its connection structure in a three-coordinate measuring device that is easy to position provided in an embodiment of the present invention.

[0021] Among them: 1- workbench, 11- support rod, 12- top plate, 2- load ring, 3- height measuring instrument, 4- scanning measuring instrument, 5- measuring mechanism, 51- lifting assembly, 511- threaded rod, 512- synchronous gear disc, 513- synchronous belt, 514- first motor, 52- rotating assembly, 521- ring groove, 522- sliding ring, 523- inner ring, 524- gear ring, 525- control chamber, 526- second motor, 527- transmission gear disc, 6- positioning mechanism, 61- top clamping assembly, 611- extrusion spring, 612- top pressure piece, 613- stop rod, 62- bottom clamping assembly, 621- bottom clamping piece, 622- positioning part, 6221- telescopic chamber, 6222-connecting groove, 6223-fixing block, 6224-guide groove, 6225-guide column, 6226-control spring, 623-limiting part, 6231-first clamping piece, 62311-clamping groove, 62312-first telescopic groove, 62313-first clamping column, 62314-positioning spring, 62315-wire groove, 62316-control rope, 62317-first magnetic block, 62318-second magnetic block, 6232-second clamping piece, 62321-second telescopic groove, 62322-second clamping column, 62323-connecting rod, 62324-control disk, 62325-magnetic sheet, 7-through hole, 8-vertical rod, 9-pull ring. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0023] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0024] like Figure 1 , Figure 2 , Figure 3As shown, it is a structural diagram of a three-coordinate measuring device that is easy to position provided by an embodiment of the present invention, comprising a workbench 1, a plurality of groups of support rods 11 are fixedly installed on the surface of the workbench 1, a top plate 12 is fixedly installed on the top ends of the plurality of support rods 11, a carrying ring 2 is arranged between the workbench 1 and the top plate 12, a height measuring instrument 3 is arranged on the inner side wall of the carrying ring 2, a scanning measuring instrument 4 is arranged on the inner side wall of the carrying ring 2, a measuring mechanism 5 is arranged on the surface of the carrying ring 2, the measuring mechanism 5 comprises a lifting component 51 and a rotating component 52, the lifting component 51 is located between the top plate 12 and the workbench 1 and is connected to the carrying ring 2, the lifting component 51 is used to control the carrying ring 2 to move in the vertical direction, the rotating component 52 is located in the carrying ring 2 and is connected to the scanning measuring instrument 4, the rotating component 52 is used to control the scanning measuring instrument 4 to move along the inner side wall of the carrying ring 2 Rotation, a positioning mechanism 6 is arranged between the workbench 1 and the top plate 12, the positioning mechanism 6 includes a top clamping assembly 61 and a bottom clamping assembly 62, the top clamping assembly 61 is located at the bottom wall of the top plate 12, the top clamping assembly 61 is used to apply pressure to the top of the object to be tested, the bottom clamping assembly 62 includes a bottom clamping piece 621, a positioning portion 622 and a limiting portion 623, the bottom clamping piece 621 is provided with multiple groups, the positioning portion 622 is located in the workbench 1 and is connected to the bottom clamping piece 621, the positioning portion 622 controls the multiple groups of bottom clamping pieces 621 to be distributed in a circular shape with equal spacing on the surface of the workbench 1, the limiting portion 623 includes a first clamping piece 6231 and a second clamping piece 6232, the first clamping piece 6231 is used to adjust the positions of the multiple groups of bottom clamping pieces 621 on the surface of the workbench 1 by cooperating with the second clamping piece 6232.

[0025] Initially, the carrying ring 2 is located on the surface of the workbench 1, and the first clamping member 6231 cooperates with the positioning portion 622 to position the bottom clamping member 621. At this time, the multiple groups of bottom clamping members 621 are integrally located inside the workbench 1, and the object to be measured is placed on the surface of the workbench 1. At this time, the top clamping assembly 61 applies pressure to the object to be measured, and the object to be measured can be stably placed on the surface of the workbench 1. During measurement, the rotating assembly 52 drives the scanning measuring instrument 4 to rotate around the object to be measured inside the carrying ring 2, and the scanning measuring instrument 4 can measure the length and width of each position of the object to be measured. During scanning measurement, the lifting assembly 51 controls the carrying ring 2 to continuously move vertically upward, and the carrying ring 2 drives the scanning measuring instrument 4 to move upward synchronously, and the scanning measuring instrument 4 can measure the length and width of the object to be measured within the entire height range. When the carrying ring 2 moves upward, the height measuring instrument 3 can accurately measure the height of the object to be measured. When measuring the top attachment of the object to be measured, the top clamping assembly 61 releases the top restriction of the object to be measured, which can effectively improve the measurement accuracy of the scanning measuring instrument 4 and the height measuring instrument 3. After the bottom position measurement of the object to be measured is completed, when the carrying ring 2 moves upward, the first clamping member 6231 releases the restriction on the positioning portion 622, and the second clamping member 6232 cooperates with the positioning portion 622 to conveniently adjust the positions of the multiple groups of bottom clamping members 621, and the multiple groups of bottom clamping members 621 can stably clamp and fix the bottom of the side wall of the object to be measured. During the entire measurement process, the object to be measured can be clamped and fixed from the bottom and top of the object to be measured, and the clamping position can be prevented from interfering with the measurement process, effectively improving the measurement accuracy.

[0026] like Figure 1 , Figure 2 As shown, as a preferred embodiment of the present invention, the lifting assembly 51 includes a plurality of groups of annularly distributed threaded rods 511 rotatably installed between the top plate 12 and the workbench 1, the threaded rods 511 are threadedly connected to the carrying ring 2, and a synchronous gear plate 512 is fixedly installed on the surface of the threaded rod 511. The plurality of groups of synchronous gear plates 512 are commonly connected to a synchronous belt 513, and the top end of a group of threaded rods 511 extends above the top plate 12 and is connected to a first motor 514.

[0027] When in use, the first motor 514 drives a group of threaded rods 511 to rotate and then drives the synchronous gear plate 512 to rotate. Multiple groups of synchronous gear plates 512 cooperate with the synchronous belt 513 to drive multiple groups of threaded rods 511 to rotate synchronously. The threaded rods 511 can conveniently control the load-bearing ring 2 to move in the vertical direction between the workbench 1 and the top plate 12.

[0028] like Figure 1 , Figure 2 , Figure 3 , Figure 5As shown, as a preferred embodiment of the present invention, the rotating component 52 includes an annular groove 521 provided on the inner side wall of the carrying ring 2, a sliding ring 522 is rotatably installed in the annular groove 521, the sliding ring 522 extends to the outside of the annular groove 521 and is fixedly installed with an inner ring 523, the scanning measuring instrument 4 and the height measuring instrument 3 are respectively fixedly installed on the surface of the inner ring 523, a gear ring 524 is provided on the annular side wall of the sliding ring 522, a control chamber 525 connected to the annular groove 521 is provided in the carrying ring 2, a second motor 526 is fixedly installed on the surface of the carrying ring 2, the output shaft of the second motor 526 extends into the control chamber 525 and is fixedly installed with a transmission gear disc 527, and the transmission gear disc 527 is meshed and connected with the gear ring 524.

[0029] When measuring the object to be measured, the second motor 526 drives the transmission gear disc 527 to rotate, the transmission gear disc 527 engages with the gear ring 524 for transmission, and then drives the sliding ring 522 to rotate in the ring groove 521, the sliding ring 522 drives the inner ring 523 to rotate, and the inner ring 523 drives the height measuring instrument 3 and the scanning measuring instrument 4 to rotate around the object to be measured on the inner side of the carrying ring 2. The height measuring instrument 3 can measure the height of the object to be measured, and the scanning measuring instrument 4 can measure the length and width of the object to be measured at various heights.

[0030] like Figure 1 , Figure 2 , Figure 3 As shown, as a preferred embodiment of the present invention, the top clamping assembly 61 includes an extrusion spring 611 fixedly installed on the bottom wall of the top plate 12, and a top pressure piece 612 is fixedly installed on the telescopic end of the extrusion spring 611. A plurality of groups of baffle rods 613 that cooperate with the supporting ring 2 are fixedly installed around the top pressure piece 612.

[0031] Initially, the carrying ring 2 is located on the surface of the workbench 1, and the object to be measured is placed on the surface of the workbench 1. The extrusion spring 611 applies a thrust to the top pressure piece 612, and the top pressure piece 612 can stably squeeze and fix the top of the object to be measured. During the process of the carrying ring 2 moving upward from a low position for measurement, the top pressure piece 612 can continuously measure the object to be measured. When it is necessary to measure the top of the object to be measured, the carrying ring 2 moves upward and contacts the blocking rod 613. The carrying ring 2 and the blocking rod 613 cooperate with each other to push the top pressure piece 612 to move upward synchronously. At this time, the top pressure piece 612 is separated from the top of the object to be measured, and the height measuring instrument 3 and the scanning measuring instrument 4 can accurately measure the top of the object to be measured.

[0032] like Figure 1 , Figure 3 , Figure 4 , Figure 6As shown, as a preferred embodiment of the present invention, the positioning portion 622 includes a plurality of groups of annularly distributed telescopic cavities 6221 opened inside the workbench 1, a connecting groove 6222 connected to the telescopic cavity 6221 is opened downward on the surface of the workbench 1, a fixed block 6223 is slidably installed in the telescopic cavity 6221, the bottom clamping member 621 is slidably installed in the fixed block 6223 along the vertical direction, and guide grooves 6224 are respectively opened on the opposite side walls of the telescopic cavity 6221, and the guide grooves 6224 are of a broken line structure, and a guide column 6225 extending to the outside of the fixed block 6223 is fixedly installed on the side wall of the bottom clamping member 621, and the guide column 6225 is slidably connected to the guide groove 6224, and a control spring 6226 is fixedly installed on the side wall of the telescopic cavity 6221, and the telescopic end of the control spring 6226 is connected to the fixed block 6223.

[0033] Initially, the first clamping member 6231 fixes the position of the fixed block 6223 in the telescopic cavity 6221. At this time, the guide column 6225 is at the lowest point of the guide groove 6224, and the bottom clamping member 621 is entirely inside the workbench 1. The height measuring instrument 3 on the inside of the supporting ring 2 and the scanning measuring instrument 4 can accurately measure the bottom data of the object to be measured, and the bottom clamping member 621 will not interfere with the measurement process. When the carrying ring 2 moves upward to continue measuring, the first clamping piece 6231 releases the restriction on the fixed block 6223, and the control spring 6226 pushes the fixed block 6223 to move in the telescopic cavity 6221. The fixed block 6223 drives the bottom clamping piece 621 to move synchronously, and the guide column 6225 moves along the guide groove 6224. The guide column 6225 and the guide groove 6224 cooperate with each other to control the bottom clamping piece 621 to move upward and extend to the top of the workbench 1. After the bottom clamping piece 621 and the bottom end of the side wall of the object to be measured are fitted with each other, the second clamping piece 6232 fixes the position of the fixed block 6223 again in the telescopic cavity 6221. At this time, multiple groups of bottom clamping pieces 621 can stably clamp and fix the bottom of the object to be measured.

[0034] like Figure 1 , Figure 3 , Figure 4 , Figure 6As shown, as a preferred embodiment of the present invention, the first clamping member 6231 includes a clamping groove 62311 provided on the bottom wall of the fixing block 6223, the bottom wall of the telescopic cavity 6221 is provided with a first telescopic groove 62312, a first clamping column 62313 cooperating with the clamping groove 62311 is slidably installed in the first telescopic groove 62312, a positioning spring 62314 connected to the first clamping column 62313 is fixedly installed on the bottom wall of the first telescopic groove 62312, A wire groove 62315 connected to the first telescopic groove 62312 is opened downward on the surface of the workbench 1, and a control rope 62316 is fixedly installed on the bottom wall of the first clamping column 62313. The end of the control rope 62316 away from the first clamping column 62313 passes through the wire groove 62315 and extends to the surface of the workbench 1 and is fixedly installed with a first magnetic block 62317. The bottom wall of the carrying ring 2 is fixedly installed with a second magnetic block 62318 that cooperates with the first magnetic block 62317.

[0035] Initially, the fixed block 6223 is pushed to move toward the end of the telescopic cavity 6221 away from the center of the workbench 1. At this time, the positioning spring 62314 applies a thrust to the first clamping column 62313, and the first clamping column 62313 is inserted into the clamping groove 62311 to fix the position of the fixed block 6223 in the telescopic cavity 6221. When the carrying ring 2 moves upward from the lowest point, the carrying ring 2 cooperates with the second magnetic block 62318 to drive the first magnetic block 62317 to move upward synchronously. The first magnetic block 62317 cooperates with the control rope 62316 to pull the first clamping column 62313 downward and separate from the clamping groove 62311. At this time, the control spring 6226 pushes the fixed block 6223 to move in the telescopic cavity 6221.

[0036] like Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 7 As shown, as a preferred embodiment of the present invention, the second clamping part 6232 includes a plurality of groups of second telescopic grooves 62321 distributed in parallel opened on the bottom wall of the telescopic cavity 6221, and a second clamping column 62322 which cooperates with the clamping groove 62311 is slidably installed in the second telescopic groove 62321 along the vertical direction, and a connecting rod 62323 is fixedly installed on the bottom wall of the second clamping column 62322, and a plurality of groups of connecting rods 62323 extend to the bottom of the workbench 1 and are jointly fixedly installed with a control disk 62324, and the control disk 62324 is made of magnetic material, and a magnetic sheet 62325 which cooperates with the control disk 62324 is fixedly installed on the bottom wall of the workbench 1.

[0037] The control spring 6226 pushes the fixed block 6223 to move in the telescopic cavity 6221. After the bottom clamping piece 621 and the bottom end of the side wall of the object to be tested are in contact with each other, the control disk 62324 is pushed to move upward. At this time, the control disk 62324 and the connecting rod 62323 cooperate with each other to push the second clamping column 62322 to move upward synchronously. The second clamping column 62322 at a specific position is inserted into the clamping groove 62311. The position of the fixed block 6223 can be fixed in the telescopic cavity 6221, and the magnetic sheet 62325 adsorbs and positions the control disk 62324 on the bottom wall of the workbench 1.

[0038] like Figure 1 , Figure 2 , Figure 3 As shown, as a preferred embodiment of the present invention, a through hole 7 is opened in the middle of the top plate 12, a vertical rod 8 is fixedly installed on the surface of the top pressure piece 612, and the top end of the vertical rod 8 passes through the through hole 7 and extends to the top of the top plate 12 and is fixedly installed with a pull ring 9.

[0039] The working principle of the present invention is: initially, the fixed block 6223 is pushed to move toward the end of the telescopic cavity 6221 away from the center of the workbench 1. At this time, the positioning spring 62314 applies a thrust to the first clamping column 62313, and the first clamping column 62313 is inserted into the clamping groove 62311 to fix the position of the fixed block 6223 in the telescopic cavity 6221. The bottom clamping piece 621 is located inside the workbench 1 as a whole.

[0040] Initially, the carrying ring 2 is located on the surface of the workbench 1, and the object to be measured is placed on the surface of the workbench 1. The extrusion spring 611 applies a thrust to the top pressure piece 612, and the top pressure piece 612 can stably squeeze and fix the top of the object to be measured. The second motor 526 drives the transmission gear disc 527 to rotate, and the transmission gear disc 527 engages with the gear ring 524 to drive the sliding ring 522 to rotate in the ring groove 521. The sliding ring 522 drives the inner ring 523 to rotate, and the inner ring 523 drives the height measuring instrument 3 and the scanning measuring instrument 4 to rotate around the object to be measured on the inner side of the carrying ring 2. The height measuring instrument 3 and the scanning measuring instrument 4 on the inner side of the carrying ring 2 can accurately measure the bottom data of the object to be measured, and the bottom clamp 621 will not interfere with the measurement process.

[0041] The first motor 514 drives a group of threaded rods 511 to rotate and then drives the synchronous gear plate 512 to rotate. The multiple groups of synchronous gear plates 512 cooperate with the synchronous belt 513 to drive the multiple groups of threaded rods 511 to rotate synchronously. The threaded rods 511 can conveniently control the carrying ring 2 to move in the vertical direction between the workbench 1 and the top plate 12. The carrying ring 2 drives the scanning measuring instrument 4 to move upward synchronously. The scanning measuring instrument 4 can measure the length and width of the object to be measured within the entire height range. When it is necessary to measure the top of the object to be measured, the carrying ring 2 moves upward and contacts the blocking rod 613. The carrying ring 2 cooperates with the blocking rod 613 to push the top pressure piece 612 to move upward synchronously. At this time, the top pressure piece 612 is separated from the top of the object to be measured, and the height measuring instrument 3 and the scanning measuring instrument 4 can accurately measure the top of the object to be measured.

[0042] When the carrying ring 2 moves upward from the lowest point, the carrying ring 2 cooperates with the second magnetic block 62318 to drive the first magnetic block 62317 to move upward synchronously. The first magnetic block 62317 cooperates with the control rope 62316 to pull the first clamping column 62313 to move downward and then separate from the clamping groove 62311. At this time, the control spring 6226 pushes the fixed block 6223 to move in the telescopic cavity 6221. The fixed block 6223 drives the bottom clamping member 621 to move synchronously, and the guide column 6225 moves along the guide groove 6224. The guide column 6225 cooperates with the guide groove 6224 to control the bottom clamping member 621 to move upward and extend to the top of the workbench 1. After the bottom clamping member 621 and the bottom end of the side wall of the object to be tested are attached to each other, the control plate 62324 is pushed to move upward. At this time, the control plate 62324 cooperates with the connecting rod 62323 to push the second clamping column 62322 to move upward synchronously. The second clamping column 62322 at a specific position is inserted into the clamping groove 62311. The position of the fixed block 6223 can be fixed in the telescopic cavity 6221, and the magnetic sheet 62325 adsorbs and positions the control plate 62324 on the bottom wall of the workbench 1. At this time, multiple groups of bottom clamping members 621 can stably clamp and fix the bottom of the object to be tested.

[0043] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A three-coordinate measuring device that is easy to position, comprising a workbench, a plurality of support rods are fixedly mounted on the workbench surface, a top plate is fixedly mounted on the top of the plurality of support rods, a bearing ring is arranged between the workbench and the top plate, a height measuring instrument is arranged on the inner side wall of the bearing ring, and a scanning measuring instrument is arranged on the inner side wall of the bearing ring, characterized in that: The surface of the carrying ring is provided with a measuring mechanism, and the measuring mechanism includes a lifting component and a rotating component; The lifting assembly is located between the top plate and the workbench and is connected to the carrying ring. The lifting assembly is used to control the carrying ring to move in the vertical direction. The rotating assembly is located in the carrying ring and is connected to the scanning measuring instrument. The rotating assembly is used to control the scanning measuring instrument to rotate along the inner side wall of the carrying ring. A positioning mechanism is provided between the workbench and the top plate, and the positioning mechanism comprises a top clamping assembly and a bottom clamping assembly; The top clamping assembly is located at the bottom wall of the top plate, and is used to apply pressure to the top of the object to be tested; The bottom clamping assembly includes a bottom clamping piece, a positioning part and a limiting part. The bottom clamping piece is provided with multiple groups. The positioning part is located in the workbench and connected to the bottom clamping piece. The positioning part controls the multiple groups of bottom clamping pieces to be distributed in a circular shape with equal spacing on the surface of the workbench. The limiting part includes a first clamping member and a second clamping member. The first clamping member cooperates with the second clamping member to adjust the positions of multiple groups of bottom clamping members on the surface of the workbench.

2. A three-coordinate measuring device for facilitating positioning according to claim 1, characterized in that: The lifting assembly includes multiple groups of annularly distributed threaded rods rotatably installed between the top plate and the workbench, the threaded rods are threadedly connected to the load-bearing ring, synchronous gear plates are fixedly installed on the surface of the threaded rods, and multiple groups of synchronous gear plates are commonly connected to a synchronous belt. The top end of a group of threaded rods extends above the top plate and is connected to a first motor.

3. The three-coordinate measuring device for facilitating positioning according to claim 1, characterized in that: The rotating assembly includes an annular groove provided on the inner side wall of a load-bearing ring, a sliding ring is rotatably installed in the annular groove, the sliding ring extends to the outside of the annular groove and an inner ring is fixedly installed, the scanning measuring instrument and the height measuring instrument are respectively fixedly installed on the surface of the inner ring, a gear ring is provided on the annular side wall of the sliding ring, a control cavity connected to the annular groove is provided in the load-bearing ring, a second motor is fixedly installed on the surface of the load-bearing ring, the output shaft of the second motor extends into the control cavity and a transmission gear disk is fixedly installed, and the transmission gear disk is meshingly connected with the gear ring.

4. The three-coordinate measuring device for facilitating positioning according to claim 1, characterized in that: The top clamping assembly includes an extrusion spring fixedly mounted on the bottom wall of the top plate, a top pressure piece fixedly mounted on the telescopic end of the extrusion spring, and a plurality of blocking rods cooperating with the bearing ring fixedly mounted around the top pressure piece.

5. The three-coordinate measuring device for facilitating positioning according to claim 1, characterized in that: The positioning portion includes a plurality of groups of annularly distributed telescopic cavities opened inside the workbench, a connecting groove connected to the telescopic cavity is opened downwardly on the surface of the workbench, a fixed block is slidably installed in the telescopic cavity, the bottom clamp is slidably installed in the fixed block along the vertical direction, guide grooves are respectively opened on the opposite side walls of the telescopic cavity, and the guide grooves are folded line structures, guide columns extending to the outside of the fixed block are fixedly installed on the side walls of the bottom clamp, the guide columns are slidably connected to the guide grooves, a control spring is fixedly installed on the side walls of the telescopic cavity, and the telescopic end of the control spring is connected to the fixed block.

6. The three-coordinate measuring device for facilitating positioning according to claim 5, characterized in that: The first clamping part includes a clamping groove opened on the bottom wall of the fixed block, the bottom wall of the telescopic cavity is opened with a first telescopic groove, a first clamping column which cooperates with the clamping groove is slidably installed in the first telescopic groove, a positioning spring connected with the first clamping column is fixedly installed on the bottom wall of the first telescopic groove, a wire groove which is connected with the first telescopic groove is opened downward on the surface of the workbench, a control rope is fixedly installed on the bottom wall of the first clamping column, one end of the control rope away from the first clamping column extends through the wire groove to the surface of the workbench and is fixedly installed with a first magnetic block, and a second magnetic block which cooperates with the first magnetic block is fixedly installed on the bottom wall of the carrying ring.

7. A three-coordinate measuring device for facilitating positioning according to claim 6, characterized in that: The second clamping part includes multiple groups of second telescopic grooves distributed in parallel on the bottom wall of the telescopic cavity, and a second clamping column that cooperates with the clamping groove is slidably installed in the second telescopic groove along the vertical direction. A connecting rod is fixedly installed on the bottom wall of the second clamping column. Multiple groups of connecting rods extend to the bottom of the workbench and are jointly fixed with a control disk. The control disk is made of magnetic material, and a magnetic sheet that cooperates with the control disk is fixedly installed on the bottom wall of the workbench.

8. The three-coordinate measuring device for facilitating positioning according to claim 4, characterized in that: A through hole is opened in the middle of the top plate, a vertical rod is fixedly installed on the surface of the top pressure piece, and the top end of the vertical rod passes through the through hole and extends to the top of the top plate and is fixedly installed with a pull ring.

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