Collimation target seat capable of conveniently replacing permanent magnet steel and use method thereof

Abstract

The invention discloses a collimation target seat capable of conveniently replacing permanent magnet steel and a use method thereof. The collimation target seat comprises a target seat base body, a magnet threaded sleeve and permanent magnet steel, wherein a central threaded hole is formed in the top of the target seat base body, the magnet threaded sleeve is arranged in the central threaded hole, and the permanent magnet steel used for magnetically attracting a target ball of the laser tracker is arranged in the magnet threaded sleeve. The using method of the collimation target seat comprises the steps that the target seat base body is welded to a designated position of an equipment workpiece to be measured, and when the equipment workpiece to be measured needs to be baked or placed in a high-temperature environment to be used, the magnet threaded sleeve provided with the permanent magnet steel is taken out; and when the to-be-measured equipment workpiece is cooled and needs to be measured again, the magnet threaded sleeve provided with the permanent magnet steel is sleeved back into the target seat base body. The applicability of the collimation target seat disclosed by the invention is greatly expanded.

Description

Technical Field

[0001] The invention belongs to the optical technical field of collimation measurement, and relates to a collimation target seat capable of conveniently replacing permanent magnetic steel and a use method thereof. Background Art

[0002] With the development of high-end manufacturing and precision engineering technology, the complexity and processing accuracy of equipment components are constantly improving. In order to obtain better use results, higher requirements are put forward for the installation accuracy of equipment and the installation accuracy of components inside the equipment. High-precision three-dimensional measuring instruments are often required to complete the alignment measurement work in the measurement. Traditional measuring instruments and measurement methods are difficult to meet the installation accuracy requirements required by the equipment. In this context, the related technologies of laser trackers and target reference seats have been rapidly developed and widely used in the fields of high-energy physics, space science, optical processing, semiconductor manufacturing, automobile manufacturing, and aerospace manufacturing and installation.

[0003] The alignment target seat is a device used to install and fix the alignment target, and plays an important role in different application scenarios. It usually consists of three parts: the base part, the connecting part, and the target ball mounting position. The base part is the basic structure of the alignment target seat, usually made of high-strength and temperature-stable metal materials to provide reliable support; the connecting part is used to connect the alignment target seat with other equipment or structures. Common connection methods include threaded connection, snap connection, welding, etc. The design of the connecting parts needs to ensure the firmness and reliability of the connection; the target ball mounting position is the core part of the alignment target seat, which is used to install the alignment target. The shape and size of the target mounting position need to match the alignment target to ensure that the target can be accurately installed in the predetermined position.

[0005] In the prior art, mainstream products are usually fixed on the equipment workpiece by welding process, stainless steel or carbon steel material is used as the target seat base, and then a piece of permanent magnet steel with strong magnetism is firmly bonded in the target seat. The permanent magnet steel cannot be removed, and there is no stress release groove reserved in the target seat. During the welding process, the built-in permanent magnet is easily demagnetized due to high temperature, and the stress release after welding will cause the target seat to deform, thereby affecting the matching degree and measurement accuracy of the target seat and the target ball. Patent CN202011221800.8 proposes a welded target seat for particle accelerator component alignment measurement, which adopts the target seat base and permanent magnet to be installed separately. After the target seat base is welded and the stress is released, the permanent magnet is installed in the center hole of the target seat base. To a certain extent, it solves the problem of high temperature demagnetization of the built-in magnet and deformation of the measurement reference during the welding of the target seat with the component when the target seat is first installed, but the permanent magnet is difficult to remove once installed. To facilitate alignment measurement, the target is often installed on the reference seat at a raised part of the equipment workpiece that is easier to observe, and is easily damaged or even broken during the use of the equipment. Some equipment needs to be used under ultra-high vacuum. During the use of the equipment and subsequent operation and maintenance, it is difficult to avoid multiple high-temperature baking. Repeated baking will cause the permanent magnet steel in the target seat to demagnetize and become ineffective. In addition, many devices are often used in complex environments, such as high temperature, high pressure and corrosive environments. Permanent magnets are not suitable for long-term placement in such extreme use environments. In addition, equipment used in some special occasions is made of copper, aluminum and other materials, and the target reference seat is difficult to weld and fix. Summary of the invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide an alignment target seat and a method for using the same, which can conveniently replace permanent magnetic steel. Through the present invention, for precision workpieces that have been aligned, when the permanent magnetic steel in the alignment target seat fixed thereon for adsorbing the target ball of the laser tracker is subjected to mechanical damage such as cracking of the permanent magnetic steel due to accidental high-temperature demagnetization or collision, which makes the original alignment target seat invalid, there is no need to abolish the point of the target seat, nor to disassemble the entire target seat. The use function of the alignment target seat can be restored by quickly replacing the permanent magnetic steel therein; for equipment workpieces that are difficult to weld, a threaded handle is set at the bottom of the target seat base, and this type of reference target reference seat can be used without welding, providing better alignment measurement conditions for equipment installation.

[0007] The collimating target seat provided by the present invention, which can conveniently replace the permanent magnet steel, comprises a target seat base, a magnet threaded sleeve and a permanent magnet steel. A central threaded hole is opened on the top of the target seat base, a magnet threaded sleeve is arranged in the central threaded hole, and a permanent magnet steel for magnetically attracting the target ball of the laser tracker is arranged in the magnet threaded sleeve.

[0008] A magnet threaded sleeve with permanent magnet steel is provided, which is threadedly connected to a central threaded hole opened on the top of a target seat base, and a wrench groove is provided on the top surface of the magnet threaded sleeve for screwing the magnet threaded sleeve into / out of the central threaded hole opened on the target seat base.

[0009] The target ball of the laser tracker is placed on the alignment target seat, and there is no direct contact between the target ball of the laser tracker and the magnetic thread sleeve and the permanent magnet. The alignment target seat relies on the strong magnetism of the permanent magnet and the high magnetic permeability of the target seat base and the magnetic thread sleeve to firmly adsorb the target ball of the laser tracker on the measurement reference cone surface of the target seat base.

[0010] When the magnetism of the permanent magnet in the magnet threaded sleeve is not enough to firmly adsorb the target ball of the optical tracker or the permanent magnet is accidentally damaged, it is only necessary to replace the magnet threaded sleeve and the permanent magnet inside it to avoid affecting the alignment measurement accuracy of the equipment workpiece due to the disassembly and disposal of the alignment target seat.

[0011] The magnetic threaded sleeve provided with permanent magnetic steel is very convenient to disassemble and assemble, which can avoid the long-term use of the magnetic steel in unfavorable environments such as high temperature or corrosion, and effectively prolong the service life of the alignment target seat.

[0012] At the same time, an alignment target seat for welding in which the target seat base is provided with an annular stress release groove and an alignment target seat for threaded connection in which the target seat base is provided with a threaded handle and a wrench clamping portion, are proposed, so that this type of alignment target seat can be used not only on equipment workpieces that are convenient for welding, but also on equipment workpieces that are inconvenient for welding.

[0013] To achieve the above object, the present invention adopts the following technical solutions:

[0014] A collimating target seat with easily replaceable permanent magnet steel comprises a target seat base, a magnet threaded sleeve and a permanent magnet steel; the target seat base is a cylindrical structure with a central threaded hole on the top, the central threaded hole is a flat-bottomed blind hole, a magnet threaded sleeve is arranged in the central threaded hole, and a permanent magnet steel for magnetically attracting a target ball of a laser tracker is arranged in the magnet threaded sleeve.

[0015] The bottom surface of the target base body is provided with a reference plane, and the reference plane is in contact with the surface to be measured of the equipment workpiece. The bottom surface of the target base body is perpendicular to the central axis of the central threaded hole of the target base body.

[0016] The lower end of the target seat base has two structures: one is a cylindrical flat bottom structure for welding, and the lower end of the target seat base is circumferentially provided with an annular stress release groove for releasing stress after welding the target seat base and the equipment to be measured; the other is based on the flat bottom structure, and a threaded handle for connecting the equipment is arranged at the center of the bottom surface of the target seat base, and a regular hexagonal boss is arranged circumferentially at the lower end of the target seat base to serve as a wrench clamping part when installing the target seat base.

[0017] The top of the target seat base is provided with a measurement reference cone surface for matching with the target ball for collimation measurement, and the measurement reference cone surface of the target seat base is coaxial with the central threaded hole opened in the target seat base. The measurement reference cone surface of the target seat base is tangent to the outer spherical surface of the target ball of the laser tracker.

[0018] The magnetic threaded sleeve is a cylindrical structure, and is provided with an external thread matching the central threaded hole opened in the target seat base. The external thread of the magnetic threaded sleeve forms a threaded fit with the central threaded hole opened in the target seat base.

[0019] A cylindrical central blind hole with a flat bottom is provided at the top center of the magnetic threaded sleeve.

[0020] The top surface of the magnetic threaded sleeve is provided with a spanner groove for screwing the magnetic threaded sleeve into / out of the central threaded hole provided in the target seat base. The spanner groove may be a straight, cross or polygonal groove.

[0021] The permanent magnet steel arranged in the magnetic threaded sleeve is a cylindrical permanent magnet material with strong magnetic properties, and the outer diameter of the permanent magnet steel is the same as the radius of the cylindrical central blind hole of the magnetic threaded sleeve.

[0022] The target seat base and the magnet threaded sleeve are made of stainless steel with high strength and hardness, good corrosion resistance and high magnetic permeability.

[0023] The depth of the cylindrical central blind hole of the magnetic threaded sleeve is 0.5 to 5 mm greater than the height of the permanent magnetic steel.

[0024] The overall height of the magnet threaded sleeve is 0.5 to 5 mm less than the depth of the central threaded hole opened in the target seat base.

[0025] The target seat base is provided with the magnetic threaded sleeve, and the permanent magnet steel is provided in the magnetic threaded sleeve, so as to form the complete alignment target seat. The laser tracker target ball is placed on the alignment target seat, and there is no direct contact between the laser tracker target ball and the magnetic threaded sleeve and the permanent magnet steel. The alignment target seat relies on the strong magnetism of the permanent magnet steel and the high magnetic permeability of the target seat base and the magnetic threaded sleeve to firmly adsorb the laser tracker target ball on the measurement reference cone surface of the target seat base.

[0026] A method for using an alignment target seat capable of conveniently replacing permanent magnetic steel, the steps comprising:

[0027] The target seat base is installed at a designated position of a workpiece of a device to be measured, and a central threaded hole is opened on the top of the target seat base.

[0028] Furthermore, the permanent magnet steel is placed in the magnet threaded sleeve.

[0029] Furthermore, the magnet threaded sleeve provided with the permanent magnet steel is fully screwed into the central threaded hole provided on the top of the target seat base.

[0030] Furthermore, a laser tracker target ball is placed on the alignment target seat, and the laser tracker target ball is observed to see whether it is adsorbed. If the laser tracker target ball is firmly adsorbed, it means that the permanent magnet steel set in the threaded sleeve meets the use requirements of the alignment target seat; otherwise, it means that the permanent magnet steel set in the threaded sleeve does not meet the use requirements of the alignment target seat. The magnet threaded sleeve with the permanent magnet steel is taken out and replaced until the permanent magnet steel set in the threaded sleeve meets the use requirements of the alignment target seat.

[0031] Furthermore, when the workpiece of the device to be measured needs to be baked or placed in a high temperature environment for use, in order to prevent the permanent magnetic steel set in the magnetic threaded sleeve from being demagnetized at high temperature, the magnetic threaded sleeve with the permanent magnetic steel set is removed, leaving only the target seat base on the workpiece of the device to be measured. When the device workpiece is cooled and needs to be re-measured, the magnetic threaded sleeve with the permanent magnetic steel set is put back into the target seat base.

[0032] Furthermore, when an accident occurs and the permanent magnet steel in the alignment target seat used to adsorb the target ball of the laser tracker is demagnetized at high temperature or bumped, causing mechanical damage such as cracking of the permanent magnet steel and causing failure, the magnet threaded sleeve with the failed permanent magnet steel can be removed and replaced with the magnet threaded sleeve with the permanent magnet steel that meets the use requirements.

[0033] Furthermore, if the equipment workpiece is in an extreme use environment such as high temperature, high pressure and corrosion for a long time, which is not suitable for long-term use of permanent magnets, the magnetic thread sleeve with the permanent magnetic steel is removed when the equipment is used, leaving only the target seat base on the equipment workpiece to be measured. When the equipment workpiece needs to be aligned for measurement, the magnetic thread sleeve with the permanent magnetic steel that meets the use requirements can be installed.

[0034] The advantages of the present invention are as follows:

[0035] First, the target ball of the laser tracker is placed on the alignment target seat. There is no direct contact between the target ball of the laser tracker and the magnetic thread sleeve and the permanent magnetic steel. The alignment target seat relies on the strong magnetism of the permanent magnetic steel and the high magnetic permeability of the target seat base and the magnetic thread sleeve to firmly adsorb the target ball of the laser tracker on the measurement reference cone surface of the target seat base.

[0036] Second, when the magnetism of the permanent magnet steel in the magnet thread sleeve is not enough to firmly adsorb the target ball of the optical tracker or the permanent magnet steel is accidentally damaged, it is only necessary to replace the magnet thread sleeve and the permanent magnet steel inside it to avoid the disassembly and disposal of the alignment target seat to affect the alignment measurement accuracy of the equipment workpiece;

[0037] Third, the magnet threaded sleeve with permanent magnet steel is very convenient to disassemble and assemble, which can prevent the magnet steel from being used in an unfavorable environment such as high temperature or corrosion for a long time, effectively extending the service life of the alignment target seat;

[0038] Fourthly, a target base base provided with an annular stress release groove for welding and a target base base provided with a threaded handle and a wrench clamping portion for threaded connection are proposed. This allows the target base base to be used not only on equipment workpieces that are convenient for welding, but also on equipment workpieces that are inconvenient for welding, greatly expanding the applicability of the target base base. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a vertical half-section structure schematic diagram of Example 1 of the present invention.

[0040] Figure 2 It is a top view of embodiment 1 of the present invention.

[0041] Figure 3 It is an isometric view of embodiment 1 of the present invention.

[0042] Figure 4 It is a schematic diagram of the vertical half-section structure of Example 2 of the present invention.

[0043] Figure 5 It is a top view of embodiment 2 of the present invention.

[0044] Figure 6 It is an isometric view of embodiment 2 of the present invention.

[0045] Wherein: 1-target seat base, 2-magnet threaded sleeve, 3-permanent magnetic steel, 4-laser tracker target ball, 101-center threaded hole, 102-measuring reference cone, 103-annular stress relief groove, 104-threaded handle, 105-wrench clamping part, 201-center blind hole, 202-wrench slot. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention but not to limit the scope of the present invention.

[0047] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "vertical", "top", "bottom", "inside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0048] Preferred embodiment 1 is that the present invention provides a collimating target seat that can easily replace permanent magnetic steel, such as Figure 1 to Figure 3 As shown, the alignment target seat includes a target seat base 1, a magnetic threaded sleeve 2 and a permanent magnetic steel 3.

[0049] The target seat base 1 is a cylindrical structure with a central threaded hole 101 on the top. The central threaded hole 101 is a flat-bottomed blind hole. A magnetic threaded sleeve 2 is arranged in the central threaded hole 101. A permanent magnet 3 for magnetically attracting a target ball 4 of a laser tracker is arranged in the magnetic threaded sleeve 2.

[0050] The bottom surface of the target base body 1 is provided with a reference plane, and the bottom surface is in contact with the surface to be measured of the equipment workpiece. The bottom surface of the target base body 1 is perpendicular to the central axis of the central threaded hole 101 of the target base body 1.

[0051] The lower part of the target base body 1 is a cylindrical flat bottom structure, and an annular stress release groove 103 is circumferentially provided at the lower part of the target base body 1 for releasing stress after welding the target base body 1 and the device to be measured.

[0052] The top of the target seat base 1 is provided with a measurement reference cone 102 for matching the target ball for alignment measurement, and the measurement reference cone 102 of the target seat base 1 is coaxial with the central threaded hole 101 provided in the target seat base 1. The measurement reference cone 102 of the target seat base 1 is tangent to the outer spherical surface of the target ball 4 of the laser tracker.

[0053] The magnetic threaded sleeve 2 is a cylindrical structure, and is provided with an external thread matching the central threaded hole 101 opened in the target seat base 1. The external thread of the magnetic threaded sleeve 2 forms a threaded fit with the central threaded hole 101 opened in the target seat base 1.

[0054] A cylindrical blind hole 201 with a flat bottom is provided at the center of the top of the magnetic threaded sleeve 2 .

[0055] A wrench groove 202 is provided on the top surface of the magnetic threaded sleeve 2 for screwing the magnetic threaded sleeve 2 into / out of the central threaded hole 101 provided in the target seat base 1 .

[0056] The permanent magnet steel 3 arranged in the magnetic threaded sleeve 2 is a cylindrical permanent magnetic material with strong magnetic properties, specifically neodymium iron boron or samarium cobalt alloy. The outer diameter of the permanent magnet steel 3 is the same as the radius of the cylindrical center blind hole of the magnetic threaded sleeve 2.

[0057] The material of the target seat base 1 and the magnet threaded sleeve 2 is stainless steel with high strength and hardness, good corrosion resistance and high magnetic permeability, and can be martensitic stainless steel or duplex stainless steel.

[0058] In order to prevent the target ball from hitting the magnetic threaded sleeve and the magnetic steel and thus avoid affecting the measurement accuracy of the target ball, the depth of the cylindrical center blind hole of the magnetic threaded sleeve 2 is 0.5 to 5 mm greater than the height of the permanent magnetic steel 3 .

[0059] The overall height of the magnetic threaded sleeve 2 is 0.5 to 5 mm less than the depth of the central threaded hole 101 opened in the target seat base 1 .

[0060] The target seat base 1 is provided with the magnetic threaded sleeve 2, and the permanent magnet steel 3 is provided in the magnetic threaded sleeve 2, so as to form the complete alignment target seat. The laser tracker target ball 4 is placed on the alignment target seat, and there is no direct contact between the laser tracker target ball 4 and the magnetic threaded sleeve 2 and the permanent magnet steel 3. The alignment target seat relies on the strong magnetism of the permanent magnet steel 3 and the high magnetic permeability of the target seat base 1 and the magnetic threaded sleeve 2 to firmly adsorb the laser tracker target ball 4 on the measurement reference cone 102 of the target seat base 1.

[0061] A method for using an alignment target seat capable of quickly replacing a permanent magnetic steel 3, the steps comprising:

[0062] In a preferred embodiment, the target base substrate 1 is welded to a designated position of a workpiece of the device to be measured, and is left to stand for more than one day after welding to release stress caused by welding.

[0063] A central threaded hole 101 is formed on the top of the target seat base 1 .

[0064] Furthermore, the permanent magnet steel 3 is placed in the magnet threaded sleeve 2 .

[0065] Furthermore, the magnet threaded sleeve 2 provided with the permanent magnet steel 3 is fully screwed into the central threaded hole 101 provided on the top of the target seat base 1 .

[0066] Furthermore, the laser tracker target ball 4 is placed on the alignment target seat, and the laser tracker target ball 4 is observed to see whether it is adsorbed. If the laser tracker target ball 4 is firmly adsorbed, it means that the permanent magnet 3 set in the threaded sleeve meets the use requirements of the alignment target seat; otherwise, it means that the permanent magnet 3 set in the threaded sleeve does not meet the use requirements of the alignment target seat. The magnet threaded sleeve 2 with the permanent magnet 3 is taken out and replaced until the permanent magnet 3 set in the threaded sleeve meets the use requirements of the alignment target seat.

[0067] Furthermore, when the workpiece of the device to be measured needs to be baked or placed in a high temperature environment for use, in order to prevent the permanent magnetic steel 3 set in the magnetic threaded sleeve 2 from being demagnetized at high temperature, the magnetic threaded sleeve 2 with the permanent magnetic steel 3 set is removed, leaving only the target seat base 1 on the workpiece of the device to be measured. When the device workpiece is cooled and needs to be re-measured, the magnetic threaded sleeve 2 with the permanent magnetic steel 3 set is installed back into the target seat base 1.

[0068] Furthermore, when an accident occurs and the permanent magnet 3 in the alignment target seat used to adsorb the laser tracker target ball 4 is demagnetized by high temperature or bumped, causing mechanical damage such as cracking of the permanent magnet 3 and causing failure, the magnet threaded sleeve 2 of the failed permanent magnet 3 can be removed and replaced with the magnet threaded sleeve 2 that meets the use requirements and is equipped with the permanent magnet 3.

[0069] Furthermore, if the equipment workpiece is in an extreme use environment such as high temperature, high pressure and corrosiveness that is not suitable for long-term use of permanent magnets, the magnetic thread sleeve 2 with the permanent magnetic steel 3 is removed when the equipment is used, leaving only the target seat base 1 on the equipment workpiece to be measured. When the equipment workpiece needs to be aligned for measurement, the magnetic thread sleeve 2 with the permanent magnetic steel 3 that meets the use requirements can be installed.

[0070] The preferred embodiment 2 of the alignment target seat capable of quickly replacing the permanent magnetic steel 3 provided by the present invention is as follows: Figure 4 As shown in Figure 6, the alignment target seat includes a target seat base 1, a magnetic threaded sleeve 2 and a permanent magnetic steel 3.

[0071] The target seat base 1 is a cylindrical structure with a central threaded hole 101 on the top. The central threaded hole 101 is a flat-bottomed blind hole. A magnetic threaded sleeve 2 is arranged in the central threaded hole 101. A permanent magnet 3 for magnetically attracting a target ball 4 of a laser tracker is arranged in the threaded sleeve.

[0072] The bottom surface of the target base body 1 is provided with a reference plane, and the bottom surface is in contact with the surface to be measured of the equipment workpiece. The bottom surface of the target base body 1 is perpendicular to the central axis of the central threaded hole 101 of the target base body 1.

[0073] A threaded handle 104 for connecting equipment is arranged at the center of the bottom surface of the target seat base 1 at the lower part of the target seat base 1, and a regular hexagonal boss is arranged circumferentially at the lower part of the target seat base 1 of this structure to serve as a wrench clamping part 105 when installing the target seat base 1 of this structure.

[0074] The top of the target seat base 1 is provided with a measurement reference cone 102 for matching the target ball for alignment measurement, and the measurement reference cone 102 of the target seat base 1 is coaxial with the central threaded hole 101 provided in the target seat base 1. The measurement reference cone 102 of the target seat base 1 is tangent to the outer spherical surface of the target ball 4 of the laser tracker.

[0075] The magnetic threaded sleeve 2 is a cylindrical structure, and is provided with an external thread matching the central threaded hole 101 opened in the target seat base 1. The external thread of the magnetic threaded sleeve 2 forms a threaded fit with the central threaded hole 101 opened in the target seat base 1.

[0076] A flat-bottomed cylindrical central blind hole is provided at the top center of the magnetic threaded sleeve 2 .

[0077] A regular hexagonal wrench slot 202 is provided on the top surface of the magnetic threaded sleeve 2 , which is used for screwing the magnetic threaded sleeve 2 into / out of the central threaded hole 101 provided in the target seat base 1 .

[0078] The permanent magnet steel 3 arranged in the magnetic threaded sleeve 2 is a cylindrical permanent magnetic material with strong magnetic properties, specifically neodymium iron boron or samarium cobalt alloy. The outer diameter of the permanent magnet steel 3 is the same as the radius of the cylindrical center blind hole of the magnetic threaded sleeve 2.

[0079] The material of the target seat base 1 and the magnet threaded sleeve 2 is stainless steel with high strength and hardness, good corrosion resistance and high magnetic permeability, and can be martensitic stainless steel or duplex stainless steel.

[0080] The depth of the cylindrical central blind hole of the magnetic threaded sleeve 2 is 0.5 to 5 mm greater than the height of the permanent magnetic steel 3 .

[0081] The overall depth of the magnetic threaded sleeve 2 is 0.5 to 5 mm less than the depth of the central threaded hole 101 opened in the target seat base 1 .

[0082] The target seat base 1 is provided with the magnetic threaded sleeve 2, and the permanent magnet steel 3 is provided in the magnetic threaded sleeve 2, so as to form the complete alignment target seat. The laser tracker target ball 4 is placed on the alignment target seat, and there is no direct contact between the laser tracker target ball 4 and the magnetic threaded sleeve 2 and the permanent magnet steel 3. The alignment target seat relies on the strong magnetism of the permanent magnet steel 3 and the high magnetic permeability of the target seat base 1 and the magnetic threaded sleeve 2 to firmly adsorb the laser tracker target ball 4 on the measurement reference cone 102 of the target seat base 1.

[0083] A method for using an alignment target seat capable of quickly replacing a permanent magnetic steel 3, the steps comprising:

[0084] The target base body 1 is installed at a designated position of a workpiece of a device to be measured, and a central threaded hole 101 is formed on the top of the target base body 1 .

[0085] Furthermore, the permanent magnet steel 3 is placed in the magnet threaded sleeve 2 .

[0086] Furthermore, the magnet threaded sleeve 2 provided with the permanent magnet steel 3 is fully screwed into the central threaded hole 101 provided on the top of the target seat base 1 .

[0087] Furthermore, the laser tracker target ball 4 is placed on the alignment target seat, and the laser tracker target ball 4 is observed to see whether it is adsorbed. If the laser tracker target ball 4 is firmly adsorbed, it means that the permanent magnet 3 set in the threaded sleeve meets the use requirements of the alignment target seat; otherwise, it means that the permanent magnet 3 set in the threaded sleeve does not meet the use requirements of the alignment target seat. The magnet threaded sleeve 2 with the permanent magnet 3 is taken out and replaced until the permanent magnet 3 set in the threaded sleeve meets the use requirements of the alignment target seat.

[0088] Furthermore, when the workpiece of the device to be measured needs to be baked or placed in a high temperature environment for use, in order to prevent the permanent magnetic steel 3 set in the magnetic threaded sleeve 2 from being demagnetized at high temperature, the magnetic threaded sleeve 2 with the permanent magnetic steel 3 set is removed, leaving only the target seat base 1 on the workpiece of the device to be measured. When the device workpiece is cooled and needs to be re-measured, the magnetic threaded sleeve 2 with the permanent magnetic steel 3 set is installed back into the target seat base 1.

[0089] Furthermore, when an accident occurs and the permanent magnet 3 in the alignment target seat used to adsorb the laser tracker target ball 4 is demagnetized by high temperature or bumped, causing mechanical damage such as cracking of the permanent magnet 3 and causing failure, the magnet threaded sleeve 2 of the failed permanent magnet 3 can be removed and replaced with the magnet threaded sleeve 2 that meets the use requirements and is equipped with the permanent magnet 3.

[0090] Furthermore, if the equipment workpiece is in an extreme use environment such as high temperature, high pressure and corrosiveness that is not suitable for long-term use of permanent magnets, the magnetic thread sleeve 2 with the permanent magnetic steel 3 is removed when the equipment is used, leaving only the target seat base 1 on the equipment workpiece to be measured. When the equipment workpiece needs to be aligned for measurement, the magnetic thread sleeve 2 with the permanent magnetic steel 3 that meets the use requirements can be installed.

[0091] The above embodiments are only used to illustrate the present invention, wherein the structure, connection mode and manufacturing process of each component may be changed. Any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A collimation target seat that can easily replace permanent magnetic steel, characterized in that: The invention comprises a target seat base (1), a magnetic threaded sleeve (2) and a permanent magnetic steel (3); wherein a central threaded hole (101) is provided at the top of the target seat base (1), the magnetic threaded sleeve (2) is arranged in the central threaded hole (101), and the permanent magnetic steel (3) for magnetically attracting a target ball (4) of a laser tracker is arranged in the magnetic threaded sleeve (2).

2. The alignment target seat according to claim 1, characterized in that: The bottom surface of the target seat base (1) is provided with a reference plane for fitting with the surface to be measured of the equipment workpiece; the bottom surface of the target seat base (1) is perpendicular to the central axis of the central threaded hole (101) of the target seat base (1).

3. The alignment target seat according to claim 1, characterized in that: A threaded handle (104) for connecting equipment is arranged at the center of the bottom surface of the target seat base (1); a regular hexagonal boss is arranged circumferentially at the lower end of the target seat base (1) as a wrench clamping portion 105 for installing the target seat base (1).

4. The alignment target seat according to claim 1, 2 or 3, characterized in that: A stress release groove (103) is provided at the lower end of the target seat base (1) for releasing stress generated by welding the target seat base (1) to the device to be measured.

5. The alignment target seat according to claim 1, 2 or 3, characterized in that: The top of the target seat base (1) is provided with a measurement reference cone surface (102) for matching with a laser tracker target ball (4); the measurement reference cone surface (102) is coaxial with the central threaded hole (101); and the measurement reference cone surface (102) is tangent to the outer spherical surface of the laser tracker target ball (4).

6. The alignment target seat according to claim 1, 2 or 3, characterized in that: The target seat base (1) is a cylindrical structure, and the central threaded hole (101) is a flat-bottomed cylindrical blind hole; the magnetic threaded sleeve (2) is a cylindrical structure, and the magnetic threaded sleeve (2) is provided with an external thread matching the inner wall thread of the central threaded hole (101), and the external thread of the magnetic threaded sleeve (2) is connected to the central threaded hole (101) through threaded matching.

7. The alignment target seat according to claim 1, 2 or 3, characterized in that: The top surface of the magnetic threaded sleeve (2) is provided with a wrench groove (202) for screwing the magnetic threaded sleeve (2) into or out of the central threaded hole (101).

8. The alignment target seat according to claim 1, 2 or 3, characterized in that: The permanent magnet steel (3) is a cylindrical permanent magnet material; a cylindrical blind hole for accommodating the permanent magnet steel (3) is provided at the center of the magnetic threaded sleeve (2); the outer diameter of the permanent magnet steel (3) matches the radius of the cylindrical blind hole of the magnetic threaded sleeve (2); the depth of the cylindrical blind hole of the magnetic threaded sleeve (2) is 0.5 to 5 mm greater than the height of the permanent magnet steel (3); and the overall height of the magnetic threaded sleeve (2) is 0.5 to 5 mm less than the depth of the central threaded hole (101).

9. The alignment target seat according to claim 1, 2 or 3, characterized in that: The target seat base (1) and the magnetic threaded sleeve (2) are made of martensitic stainless steel or duplex stainless steel; the permanent magnetic steel (3) non-contactly magnetically attracts the laser tracker target ball (4) to be installed.

10. A method for using the alignment target seat capable of conveniently replacing permanent magnetic steel according to claim 1, the steps comprising: The target seat base (1) is welded to a designated position of a workpiece of the device to be measured; when the workpiece of the device to be measured needs to be baked or placed in a high-temperature environment for use, the magnetic threaded sleeve (2) provided with the permanent magnetic steel (3) is taken out; when the workpiece of the device to be measured needs to be re-measured after cooling, the magnetic threaded sleeve (2) provided with the permanent magnetic steel (3) is installed back into the target seat base (1).

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