Automatic centering target ball target seat

Abstract

An automatic centering target ball target seat comprises a supporting seat and a fixing seat, a cylindrical blind hole is coaxially formed in the center of the upper end face of the supporting seat, the upper end of the cylindrical blind hole expands outwards to form a coaxial conical surface, a magnet is installed at the bottom of the cylindrical blind hole, and an outer stud is coaxially arranged on the lower end face of the supporting seat; the upper end of the fixing base is provided with an internal thread sleeve, the lower end of the fixing base is provided with a positioning sleeve, the internal thread sleeve and the positioning sleeve are coaxial and communicated, and a positioning shoulder protrudes out of the joint of the internal thread sleeve and the positioning sleeve. Guide holes penetrating through the positioning sleeve are evenly distributed in the lower end of the positioning sleeve in the circumferential direction, tensioning blocks are inserted into the guide holes, the outer ends of the tensioning blocks extend out of the guide holes, and conical surfaces are arranged at the inner ends of the tensioning blocks. A sliding block is sleeved in the positioning sleeve; a cone with the same taper as the conical surface is arranged at the lower end of the sliding block; the outer stud is in threaded connection with the inner threaded sleeve, the supporting seat is rotated to enable the outer stud to abut against the sliding block and press the sliding block downwards, and the cone abuts against the conical surface and pushes the tensioning block to expand outwards to abut against a mounting hole in a measurement section.

Description

Technical Field

[0001] The invention relates to the technical field of target bases for laser tracking measurement, and in particular to an automatically centered target ball base. Background Art

[0002] The target ball used in existing laser tracking measurement is connected to the measurement section (usually a steel plate) by configuring a magnetic base for fixing the target. The target ball and the base are connected by magnetic attraction. There are usually multiple groups of circular holes in the measurement section as the measurement object to be detected. The target ball base needs to be disassembled and assembled repeatedly, and in order to meet the measurement accuracy requirements, the center of the measurement point needs to be concentric with the measurement circular hole; the measurement circular hole is generally drilled, and there are different degrees of burrs on the edge of the hole. It must be polished and cleaned to remove the burrs during measurement.

[0003] The prior art "bolted target base CN101813477A for laser tracking and measuring instrument" adopts a connecting stud + nut fastening method to connect with the measuring circular hole on the measuring section, and meets the requirements of easy disassembly and assembly and reuse. However, due to the gap between the measuring circular hole and the connecting stud, the concentricity of the stud and the measuring circular hole is poor after the bolt is tightened, which affects the coaxiality of the target ball and the measuring circular hole, and then affects the measurement accuracy and produces errors. Summary of the invention

[0004] The invention provides a target ball base with automatic centering and centering to overcome the shortcomings of the prior art.

[0005] The technical solution adopted by the present invention is: an automatic centering target ball target seat, including a support seat and a fixed seat, the support seat has a coaxial cylindrical blind hole in the center of the upper end face, the upper end of the cylindrical blind hole is expanded outward to form a coaxial conical surface, the bottom of the cylindrical blind hole is equipped with a magnet, and the lower end face of the support seat has a coaxial external stud; the upper end of the fixed seat has an internal threaded sleeve and the lower end has a positioning sleeve, the internal threaded sleeve is coaxial and connected with the positioning sleeve, and the connection between the internal threaded sleeve and the positioning sleeve is protruding with a positioning shoulder; the positioning sleeve The lower end of the positioning sleeve is evenly distributed with guide holes that penetrate the positioning sleeve in the circumferential direction, and a tension block is inserted in the guide hole, and the outer end of the tension block extends out of the guide hole, and the inner end of the tension block has a conical surface; a sliding block is sleeved in the positioning sleeve, and the lower end of the sliding block has a cone with the same taper as the conical surface; the external stud is threadedly connected with the internal threaded sleeve, and the rotating support seat makes the lower end of the external stud abut against the upper end of the sliding block and presses the sliding block downward, so that the cone abuts against the conical surface and pushes the tension block to expand outward and abut against the mounting hole on the measuring section.

[0006] The guide hole is an axially arranged strip hole, the tension block is a T-shaped structure, and the legs of the T-shaped structure are adapted to be inserted in the strip hole, and the conical surface is located on the end surface of the T-shaped structure.

[0007] The guide holes are provided in three numbers.

[0008] The bosses are evenly distributed on the conical surface, and the top surfaces of the bosses are conical surfaces with the same taper as the conical surface.

[0009] The bosses are provided in three numbers.

[0010] An oil-free self-lubricating sleeve is fixedly installed in the positioning sleeve, and the sliding block is sleeved in the oil-free self-lubricating sleeve.

[0011] A connecting shaft is coaxially fixed to the upper end of the sliding block, and the top end of the connecting shaft abuts against the lower end of the outer stud.

[0012] An annular boss protrudes downward from the inner end of the lower end surface of the positioning shoulder, so that an annular groove is formed between the annular boss and the outer diameter of the positioning sleeve.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention utilizes the conical surface centering principle to realize automatic centering between the target seat and the measuring circular hole, and has a simple disassembly and assembly structure, which is convenient for repeated disassembly and assembly, and is suitable for measuring circular holes of various aperture sizes and different plate thicknesses, and has a low cost of use.

[0015] 2. The present invention forms point contact with the target ball through the conical boss, so that the target ball can be centered more accurately, thereby ensuring measurement accuracy.

[0016] 3. The lower end surface of the positioning shoulder of the present invention is provided with an avoidance groove, which can effectively avoid the influence of the flange burr on the top of the measuring circular hole on the installation of the target seat, and avoid the measurement error caused by the interference of the hole edge. At the same time, it reduces the process of deburring and grinding the circular hole before measurement, and improves the measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the support base of the present invention;

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the fixing seat of the present invention;

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the tensioning block of the present invention. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-4 The present invention is described in detail with specific embodiments.

[0023] Figure 1-2 An embodiment of the present invention is shown, comprising a support seat 1 and a fixing seat 2. The support seat 1 has a cylindrical blind hole 1-2 coaxially in the center of the upper end face, the upper end of the cylindrical blind hole 1-2 is expanded outward to form a coaxial conical surface 1-1, the bottom of the cylindrical blind hole 1-2 is provided with a magnet 5, and the lower end face of the support seat 1 has an external stud 1-3 coaxially; the fixing seat 2 has an internal threaded sleeve 2-1 at the upper end and a positioning sleeve 2-2 at the lower end, the internal threaded sleeve 2-1 is coaxial with and connected to the positioning sleeve 2-2, and a positioning shoulder 2-3 is protruded outward at the junction of the internal threaded sleeve 2-1 and the positioning sleeve 2-2; the positioning sleeve 2-2 has a through-hole circumferentially uniformly distributed on the lower end. A guide hole 2-4 is passed through the positioning sleeve 2-2, and a tensioning block 4 is inserted in the guide hole 2-4, and the outer end of the tensioning block 4 extends out of the guide hole 2-4, and the inner end of the tensioning block 4 has a conical surface 4-1; a sliding block 3 is sleeved inside the positioning sleeve 2-2, and the lower end of the sliding block 3 has a cone 3-1 with the same taper as the conical surface 4-1; the outer stud 1-3 is threadedly connected with the inner threaded sleeve 2-1, and the rotating support seat 1 makes the lower end of the outer stud 1-3 abut against the upper end of the sliding block 3 and press the sliding block 3 downward, and the cone 3-1 abuts against the conical surface 4-1 and pushes the tensioning block 4 to expand outward and abut against the mounting hole 6-1 on the measuring section 6.

[0024] Preferably, the guide hole 2-4 is an axially arranged strip hole, the tension block 4 is a T-shaped structure, and the leg 4-2 of the T-shaped structure is adapted to be inserted in the strip hole, and the conical surface 4-1 is located on the end surface of the T-shaped structure. Specifically, three guide holes 2-4 are provided.

[0025] On the basis of the above embodiment, in order to ensure and improve the measurement accuracy, three bosses 1-4 are evenly distributed on the conical surface 1-1, and the top surface of the bosses 1-4 is a conical surface with the same taper as the conical surface 1-1. The conical bosses form point contact with the target ball, so that the target ball can be centered more accurately, ensuring the measurement accuracy.

[0026] On the basis of the above embodiment, in order to ensure the sliding block 3 to slide flexibly and reduce the influence of wear on the accuracy, an oil-free self-lubricating sleeve 7 is fixedly installed in the positioning sleeve 2-2, and the sliding block 3 is sleeved in the oil-free self-lubricating sleeve 7. Further, in order to shorten the stroke of the sliding block 3, a connecting shaft 8 is coaxially fixed to the upper end of the sliding block 3, and the top end of the connecting shaft 8 is against the lower end of the outer stud 1-3.

[0027] On the basis of the above-mentioned embodiment, the inner end of the lower end face of the positioning shoulder 2-3 protrudes downward with an annular boss 2-5, so that an annular groove 2-6 is formed between the annular boss 2-5 and the outer diameter of the positioning sleeve 2-2. The annular groove 2-6 effectively avoids the influence of the flange burr on the top of the measuring circular hole on the installation of the target seat, and avoids the measurement error caused by the interference of the hole edge. Preferably, the positioning shoulder 2-3 is evenly distributed with three protrusions, and the annular boss 2-5 is evenly divided into three sections and corresponds to the three protrusions one by one. The contact surface with the measuring base plate is reduced by the annular boss 2-5 being evenly divided into three sections, so as to avoid the measurement error caused by the non-vertical installation position. In addition, the three protrusions of the positioning shoulder 2-3 are also convenient for taking and placing during disassembly and assembly.

[0028] When in use, first rotate the support seat 1 in the reverse direction, so that its lower end is separated from the upper end of the connecting shaft 8 by a distance, then manually retract the tension block 4, and then insert the lower end of the positioning sleeve 2-2 into the measuring circular hole 6-1 on the measuring base plate 6, and make the end face of the annular boss 2-5 close to the upper end face of the measuring base plate 6, then rotate the support seat 1 in the forward direction, push the sliding block 3 downward, and push the tension block 4 to expand outward through the inverted cone 3-1 to tighten with the inner diameter of the measuring circular hole 6-1, and finally, place the target ball 9 on the three bosses 1-4, and fix the target ball by the suction of the magnet 5, and then the measurement can be carried out. After the measurement, the support seat 1 can be rotated in the reverse direction to complete the quick disassembly.

[0029] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A target ball base with automatic centering, characterized in that: The invention comprises a support seat (1) and a fixing seat (2); the support seat (1) has a cylindrical blind hole (1-2) coaxially in the center of the upper end face; the upper end of the cylindrical blind hole (1-2) expands outward to form a coaxial conical surface (1-1); the bottom of the cylindrical blind hole (1-2) is provided with a magnet (5); the lower end face of the support seat (1) has an external stud (1-3) coaxially; the fixing seat (2) has an internal thread sleeve (2-1) at the upper end and a positioning sleeve (2-2) at the lower end; the internal thread sleeve (2-1) and the positioning sleeve (2-2) are coaxial and connected; a positioning shoulder (2-3) protrudes outward at the connection between the internal thread sleeve (2-1) and the positioning sleeve (2-2); the lower end of the positioning sleeve (2-2) is uniformly distributed in the circumferential direction with guide pins penetrating the positioning sleeve (2-2); The guide hole (2-4) is provided with a tensioning block (4), and the outer end of the tensioning block (4) extends out of the guide hole (2-4), and the inner end of the tensioning block (4) has a conical surface (4-1); the positioning sleeve (2-2) is provided with a sliding block (3), and the lower end of the sliding block (3) has a cone (3-1) with the same taper as the conical surface (4-1); the outer stud (1-3) is threadedly connected with the inner threaded sleeve (2-1), and the support seat (1) is rotated so that the lower end of the outer stud (1-3) abuts against the upper end of the sliding block (3) and presses the sliding block (3) downward, and the cone (3-1) abuts against the conical surface (4-1) and pushes the tensioning block (4) to expand outward and abut against the mounting hole (6-1) on the measuring section (6).

2. The target ball base with automatic centering according to claim 1 is characterized in that: The guide hole (2-4) is an axially arranged strip hole, the tension block (4) is a T-shaped structure, and the legs (4-2) of the T-shaped structure are adapted to be inserted into the strip hole, and the conical surface (4-1) is located on the end surface of the T-shaped structure.

3. The target ball base with automatic centering according to claim 1 or 2, characterized in that: Three guide holes (2-4) are provided.

4. The target ball base with automatic centering according to claim 1 is characterized in that: The bosses (1-4) are evenly distributed on the conical surface (1-1), and the top surface of the bosses (1-4) is a conical surface with the same taper as the conical surface (1-1).

5. The target ball base with automatic centering according to claim 4 is characterized in that: Three bosses (1-4) are provided.

6. The target ball base with automatic centering according to claim 1, characterized in that: An oil-free self-lubricating shaft sleeve (7) is fixedly installed in the positioning sleeve (2-2), and the sliding block (3) is sleeved in the oil-free self-lubricating shaft sleeve (7).

7. The target ball base with automatic centering according to claim 1, characterized in that: A connecting shaft (8) is coaxially fixed to the upper end of the sliding block (3), and the top end of the connecting shaft (8) abuts against the lower end of the outer stud (1-3).

8. The target ball base with automatic centering according to claim 1, characterized in that: An annular boss (2-5) protrudes downward from the inner end of the lower end surface of the positioning shoulder (2-3), so that an annular groove (2-6) is formed between the annular boss (2-5) and the outer diameter of the positioning sleeve (2-2).

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