Coordinate measuring machine auxiliary detection device

Abstract

The present invention discloses an auxiliary detection device for a three-coordinate measuring machine, which includes a base plate and two support beams arranged on the base plate, three clamping mechanisms are arranged on the two support beams, one clamping mechanism is clamped on a mounting hole on the upper part of the product, and the other two clamping mechanisms are clamped on two mounting holes on the lower part of the product respectively; the clamping mechanism includes a fixed clamping plate and a movable clamping plate, wherein the fixed clamping plate is fixedly connected to the corresponding support beam, the movable clamping plate is arranged opposite to the fixed clamping plate, and a positioning column, a clamping member and a positioning pin are arranged in sequence between the two, the positioning and assembly of the product is achieved by the positioning column, the connection of the fixed clamping plate and the movable clamping plate is achieved by the clamping member, and the relative positioning of the fixed clamping plate and the movable clamping plate is achieved by the positioning pin. The present invention can achieve full-size measurement of the product by clamping in sequence, and can clamp and fix the product quickly and conveniently, and has good repeatability and stability.

Description

Technical Field

[0001] The invention relates to the field of dimension detection, in particular to an auxiliary detection device for a three-coordinate measuring machine. Background Art

[0002] Products such as boxes, shells, gears, blades, etc. in the machinery, automobile, mold, aviation and other industries need to use three-dimensional coordinate measuring machines to accurately detect their size, shape and form and position tolerances, so as to complete tasks such as part inspection, appearance measurement, process control, etc. Before inspection, the product needs to be clamped and fixed on the three-dimensional coordinate measuring machine according to the workpiece's drawings, appearance, process, assembly, etc. to ensure the stability and accuracy of the measurement. However, the existing clamping and fixing mechanism will inevitably block part of the product structure after clamping, affecting the inspection. To solve this problem, the main method is to adjust the position of the product multiple times and clamp it multiple times, so that the blocked structure on the product can be exposed outside the clamping and fixing mechanism for inspection. This operation method is complicated and inefficient, and multiple position adjustments and multiple clamping will affect the accuracy of product inspection. Summary of the invention

[0003] The purpose of the present invention is to solve the above technical problems and provide a three-coordinate measuring machine auxiliary detection device which can be clamped once and realize full-size measurement.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A three-coordinate measuring machine auxiliary detection device, comprising a base plate and two support beams arranged on the base plate, three clamping mechanisms are arranged on the two support beams, and the three clamping mechanisms are distributed in a triangular shape, one of the clamping mechanisms is located at the top and clamped on a mounting hole on the upper part of the product, and the other two clamping mechanisms are arranged on both sides below the upper clamping mechanism and are clamped on two mounting holes on the lower part of the product respectively;

[0006] The clamping mechanism includes a fixed clamping plate, a movable clamping plate, a positioning column, a clamping member and a positioning pin, wherein the fixed clamping plate is fixedly connected to the corresponding support beam, the movable clamping plate is arranged opposite to the fixed clamping plate, and the positioning column, the clamping member and the positioning pin are arranged in sequence between the two;

[0007] The positioning column is a stepped shaft-shaped structure, and its large-diameter end is transversely fixed to one side of the front end of the fixed clamping plate, and the small-diameter end is arranged toward the movable clamping plate. When clamping, the small-diameter end of the positioning column is inserted into the corresponding mounting hole on the product through clearance fit, and the depth of the mounting hole is greater than the axial length of the small-diameter end of the positioning column. The end face of the large-diameter end of the positioning column is pressed against the end face outside the mounting hole. The front end of the movable clamping plate is provided with a semicircular groove coaxially arranged with the positioning column, and the radius of the semicircular groove is greater than the radius of the mounting hole, so that the measuring needle can be inserted into the mounting hole and detect the inner wall of the mounting hole.

[0008] The clamping member includes a sleeve, a polished rod and a spring, wherein the sleeve is transversely installed in the middle of the fixed clamping plate, the polished rod is slidably inserted into the sleeve, and one end of the polished rod extends outward through the fixed clamping plate and is provided with an end cap, and the other end extends outward through the movable clamping plate and is threadedly connected with a nut to rotatably limit the movable clamping plate on the polished rod, the spring is sleeved on the polished rod and is located between the end cap and the sleeve. When clamping, after the positioning column is inserted into the corresponding mounting hole on the product, the movable clamping plate is rotated and adjusted into place, and under the action of the spring, the movable clamping plate can be moved toward the direction of the fixed clamping plate to clamp the product between the fixed clamping plate and the movable clamping plate;

[0009] The locating pin is laterally fixed to one side of the tail end of the fixed clamping plate and is arranged toward the movable clamping plate. A locating pin hole is formed on the side wall of the tail end of the movable clamping plate. When clamping, the movable clamping plate is rotated and adjusted and the locating pin is inserted into the locating pin hole under the action of the spring to ensure that the semicircular groove can be coaxially arranged with the locating column.

[0010] Furthermore, a pad is provided on the side of the front end of the movable clamping plate opposite to the fixed clamping plate. The pad is made of polyurethane or copper. A semicircular groove is formed on the pad and the semicircular groove is coaxially arranged and has the same structure as the semicircular groove on the movable clamping plate. The pad is fixed to the movable clamping plate by countersunk bolts. When clamping, the side wall of the pad is in contact with the product and the pad is located between the movable clamping plate and the product.

[0011] Furthermore, the positioning column is made of polyurethane or copper.

[0012] Furthermore, one of the two support beams is a short plate structure with a clamping mechanism provided thereon, and the other is an inverted L-shaped plate structure with a clamping mechanism provided at the lower part and a clamping mechanism provided at the upper end, and a reinforcing rib plate is provided between the two support beams and the bottom plate respectively.

[0013] Furthermore, the bottom plate is detachably mounted on a detection table of a three-dimensional coordinate measuring machine by means of bolts.

[0014] Furthermore, it also includes a support column vertically arranged between the bottom of the product and the upper part of the base plate, the support column includes a column body and a support block, the lower end of the column body is placed on the base plate, the upper end of the support block is on the bottom of the product, and a screw is also provided at the lower part of the support block, and the height of the support block is adjustable through the screw thread in the threaded hole in the middle of the upper end of the column body.

[0015] Furthermore, the support block is a cylindrical structure and the screw rod and the support block are coaxially manufactured as one piece. The upper portion of the outer wall of the support block is also processed with a conical arc surface to reduce the contact area between the support block and the bottom of the product.

[0016] Furthermore, the support column is made of polyurethane or copper.

[0017] The beneficial effects of the present invention are:

[0018] 1. Full-size measurement can be achieved through one clamping.

[0019] 2. Block the machining position as little as possible to ensure more complete measurement elements.

[0020] 3. Can clamp and fix products quickly and conveniently.

[0021] 4. It has good repeatability and stability.

[0022] 5. Can avoid scratching the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the three-dimensional structure of the auxiliary detection device of a three-dimensional coordinate measuring machine of the present invention at one angle;

[0024] Figure 2 It is a three-dimensional structural schematic diagram of another angle of the auxiliary detection device of the three-dimensional coordinate measuring machine of the present invention;

[0025] Figure 3 It is a schematic diagram of the main structure of the auxiliary detection device of the three-coordinate measuring machine of the present invention;

[0026] Figure 4 It is a rear view structural schematic diagram of the auxiliary detection device of the three-coordinate measuring machine of the present invention;

[0027] Figure 5 It is a side view structural schematic diagram of the clamping mechanism in the present invention;

[0028] Figure 6 It is a schematic diagram of the three-dimensional structure of the movable clamping plate in the present invention;

[0029] Figure 7 It is a schematic diagram of the main structure of the support column in the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0031] See also Figures 1 to 7 The three-coordinate measuring machine auxiliary detection device of the present invention comprises a base plate 2, two support beams 3, three clamping mechanisms 4 and a support column 5; the product clamped by the three-coordinate measuring machine auxiliary detection device is a transmission housing 1.

[0032] like Figure 1 As shown, two holes 21 are formed on the bottom plate 2, which can be used in conjunction with bolts. The bottom plate 2 is detachably locked and fixed on the inspection table of the three-dimensional coordinate measuring machine by bolts.

[0033] like Figures 1 to 4 As shown, the two support beams 3 are fixed on the base plate 2 and are disposed on both sides of the upper end of the base plate 2. The two support beams 3 and the base plate 2 can be fixed by bolts or welding. In order to further enhance the stability of the connection, a reinforcing rib plate 6 is also fixed between the two support beams 3 and the base plate 2 respectively.

[0034] One of the two support beams 3 is a short plate structure and the other is an inverted L-shaped plate structure, and three clamping mechanisms 4 are distributed in a triangular shape on the two support beams 3. Specifically, one clamping mechanism 4 is installed at the upper end of the support beam of the inverted L-shaped plate structure, and the clamping mechanism 4 is clamped on a mounting hole on the upper part of the product, and the other two clamping mechanisms 4 are respectively installed on the support beam of the short plate structure and the lower part of the support beam of the inverted L-shaped plate structure, and the two clamping mechanisms 4 are respectively clamped on two mounting holes on the lower part of the product; the three clamping mechanisms 4 serve as three fixing points to fix the product.

[0035] The structures of the three clamping mechanisms 4 are the same, and only the structure of one clamping mechanism 4 is described in detail:

[0036] like Figure 5 and Figure 6 As shown, the clamping mechanism 4 includes a fixed clamping plate 41, a movable clamping plate 42, a positioning column 43, a clamping piece and a positioning pin 44, wherein the fixed clamping plate 41 is fixedly connected to the corresponding support beam 3, the movable clamping plate 42 is arranged opposite to the fixed clamping plate 41, and the positioning column 43, the clamping piece and the positioning pin 44 are arranged therebetween in sequence.

[0037] The positioning column 43 is a stepped shaft structure and its large diameter end is transversely fixed to one side of the front end of the fixed clamping plate 41, and the small diameter end is arranged toward the movable clamping plate 42; when clamping, the small diameter end of the positioning column 43 is inserted into the corresponding mounting hole on the product through clearance fit and the depth of the mounting hole is greater than the axial length of the small diameter end of the positioning column 43 (that is, the small diameter end of the positioning column 43 can only be inserted to a partial depth of the mounting hole, and the portion or space in the mounting hole that is not inserted by the small diameter end of the positioning column is used for the entry and exit of the measuring needle), the end face of the large diameter end of the positioning column 43 is pressed against the end face outside the mounting hole, and the front end of the movable clamping plate 42 is provided with a semicircular groove 421 coaxially arranged with the positioning column 43, and the radius of the semicircular groove 421 is greater than the radius of the mounting hole. The design of the semicircular groove 421 can not only realize the clamping of the product, but also reserve sufficient measurement position without affecting the measurement of the hole surface, and at the same time facilitate the measuring needle to extend into the mounting hole and detect the inner wall of the mounting hole, which facilitates the editing and optimization of the measurement program.

[0038] The clamping member includes a sleeve 45, a light rod 46 and a spring 47, wherein the sleeve 45 is installed transversely through the middle part of the fixed clamping plate 41, the light rod 46 is slidably inserted into the sleeve 45, and one end of the light rod 46 extends outward through the fixed clamping plate 41 and is provided with an end cap 48, and the other end extends outward through the movable clamping plate 42 and is threadedly connected with a nut 49 to rotatably limit the movable clamping plate 42 on the light rod 46, and the spring 47 is sleeved on the light rod 46 and is between the end cap 48 and the sleeve 45; when clamping, after the positioning column 43 is inserted into the corresponding mounting hole on the product, the movable clamping plate 42 is rotated and adjusted into place and under the action of the spring 47, the movable clamping plate 42 can be moved toward the fixed clamping plate 41 to clamp the product between the fixed clamping plate 41 and the movable clamping plate 42.

[0039] The locating pin 44 is laterally fixed to one side of the tail end of the fixed clamping plate 41 and is arranged toward the movable clamping plate 42. A locating pin hole 422 is formed on the side wall of the tail end of the movable clamping plate 42. When clamping, the movable clamping plate 42 is rotated and adjusted and under the action of the spring 47, the locating pin 44 is inserted into the locating pin hole 422 to ensure that the semicircular groove 421 can be coaxially arranged with the locating column 43.

[0040] In order to avoid scratching the product, the contact surface between the three-coordinate measuring machine auxiliary detection device of the present invention and the product is made of polyurethane material or copper or a material with relatively low hardness to prevent the product from being worn. The details are as follows:

[0041] 1. The positioning column 43 needs to be in contact with the product, and the positioning column 43 is made of polyurethane or copper or a material with relatively low hardness.

[0042] 2. A pad 423 is provided at the front end of the movable clamping plate 42 on the side opposite to the fixed clamping plate 41. The movable clamping plate 42 contacts the product through the pad 423. The pad 423 is made of polyurethane, copper or a material with relatively low hardness. A semicircular groove is formed on the pad 423 and the semicircular groove is coaxially arranged with the semicircular groove on the movable clamping plate and has the same structure. When clamping, the side wall of the pad 423 contacts the product and the pad 423 is between the movable clamping plate 42 and the product. The pad 423 is fixed to the movable clamping plate 42 by a countersunk bolt 424 and is detachable, which is convenient for replacement to maintain the long-term accuracy of the clamping mechanism.

[0043] When clamping, first align the mounting hole on the product with the positioning column 43 and insert it to realize the positioning assembly of the product and the three-coordinate measuring machine auxiliary detection device of the present invention, and then adjust the movable clamping plates 42 on the three clamping mechanisms 4 in sequence, so that the positioning pins 44 are matched and inserted into the positioning pin holes 422, and then release the hand and under the action of the spring 47, the movable clamping plate 42 is pressed toward the product to realize the locking clamping of the product on the three-coordinate measuring machine auxiliary detection device. The present invention can realize the full-size measurement of the product by clamping in sequence, and blocks the machining position as little as possible, ensuring that the measuring elements are more complete, and can quickly and conveniently clamp and fix the product, with good repeatability and stability.

[0044] like Figures 1 to 4 and Figure 7 As shown, the three-coordinate measuring machine auxiliary detection device of the present invention also includes a support column 5, which is vertically placed between the bottom of the product and the upper part of the base plate 2. The support column 5 includes a column 51 and a support block 52. The lower end of the column 51 is placed on the base plate 2, and the upper end of the support block 52 is on the bottom of the product. A screw 53 is also provided at the lower part of the support block 52, and the support block 52 is height-adjustable through the screw 53 and is threaded in the threaded hole in the middle of the upper end of the column 51. The support block 52 is a cylindrical structure, and the screw 53 and the support block 52 are coaxially made integrally. The upper part of the outer wall of the support block 52 is also processed with a conical arc surface 521 to reduce the contact area between the support block 52 and the bottom of the product. The middle part of the outer wall of the support block 52 can also be processed into a polyhedron to facilitate the hand-held rotation of the support block 52 for height adjustment. The support column 5 needs to contact with the product, and it can be made of polyurethane material or copper or a material with relatively low hardness. When in use, after the product is mounted on the three clamping mechanisms, the support column 5 is placed between the product and the bottom plate 2, and the support block 52 is adjusted so that its upper end is against the bottom of the product, which plays a role of auxiliary support.

[0045] In the present invention, all edges are chamfered and rounded, which minimizes the chances of bumps and scratches on the product during clamping and makes it more convenient for measurement personnel to move the product.

[0046] After overall design and multiple modification experiments, the present invention fully realizes quick and convenient one-time clamping and fixing of the product, and the product will not be scratched during normal operation, and has good repeatability and stability.

[0047] In summary, the content of the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can propose other embodiments within the technical guiding idea of ​​the present invention, but these embodiments are all included in the scope of the present invention.

Claims

1. A three-coordinate measuring machine auxiliary detection device, comprising a base plate and two support beams arranged on the base plate, characterized in that: There are three clamping mechanisms on the two support beams, and the three clamping mechanisms are distributed in a triangle, one of which is located at the top and clamped on a mounting hole on the upper part of the product, and the other two clamping mechanisms are arranged on both sides below the upper clamping mechanism and are clamped on two mounting holes on the lower part of the product respectively; The clamping mechanism includes a fixed clamping plate, a movable clamping plate, a positioning column, a clamping member and a positioning pin, wherein the fixed clamping plate is fixedly connected to the corresponding support beam, the movable clamping plate is arranged opposite to the fixed clamping plate, and the positioning column, the clamping member and the positioning pin are arranged in sequence between the two; The positioning column is a stepped shaft-shaped structure, and its large-diameter end is transversely fixed to one side of the front end of the fixed clamping plate, and the small-diameter end is arranged toward the movable clamping plate. When clamping, the small-diameter end of the positioning column is inserted into the corresponding mounting hole on the product through clearance fit, and the depth of the mounting hole is greater than the axial length of the small-diameter end of the positioning column. The end face of the large-diameter end of the positioning column is pressed against the end face outside the mounting hole. The front end of the movable clamping plate is provided with a semicircular groove coaxially arranged with the positioning column, and the radius of the semicircular groove is greater than the radius of the mounting hole, so that the measuring needle can be inserted into the mounting hole and detect the inner wall of the mounting hole. The clamping member includes a sleeve, a polished rod and a spring, wherein the sleeve is transversely installed in the middle of the fixed clamping plate, the polished rod is slidably inserted into the sleeve, and one end of the polished rod extends outward through the fixed clamping plate and is provided with an end cap, and the other end extends outward through the movable clamping plate and is threadedly connected with a nut to rotatably limit the movable clamping plate on the polished rod, the spring is sleeved on the polished rod and is located between the end cap and the sleeve. When clamping, after the positioning column is inserted into the corresponding mounting hole on the product, the movable clamping plate is rotated and adjusted into place, and under the action of the spring, the movable clamping plate can be moved toward the direction of the fixed clamping plate to clamp the product between the fixed clamping plate and the movable clamping plate; The positioning pin is transversely fixed to one side of the tail end of the fixed clamping plate and is arranged toward the movable clamping plate. A positioning pin hole is formed on the side wall of the tail end of the movable clamping plate. When clamping, the movable clamping plate is rotated and adjusted and the positioning pin is inserted into the positioning pin hole under the action of the spring to ensure that the semicircular groove can be coaxially arranged with the positioning column. A pad is provided on the side opposite to the fixed clamping plate at the front end of the movable clamping plate. The pad is made of polyurethane or copper. A semicircular groove is formed on the pad and the semicircular groove is coaxially arranged with the semicircular groove on the movable clamping plate and has the same structure. The pad is fixed to the movable clamping plate by countersunk bolts. When clamping, the side wall of the pad contacts the product and the pad is located between the movable clamping plate and the product. One of the two supporting beams is a short plate structure with a clamping mechanism provided on it, and the other is an inverted L-shaped plate structure with a clamping mechanism provided at the lower part and a clamping mechanism provided at the upper end. A reinforcing rib plate is also provided between the two supporting beams and the bottom plate.

2. The three-coordinate measuring machine auxiliary detection device according to claim 1, characterized in that: The positioning columns are made of polyurethane or copper.

3. The three-coordinate measuring machine auxiliary detection device according to claim 1, characterized in that: The base plate is detachably mounted on the inspection table of the three-dimensional coordinate measuring machine by bolts.

4. The three-coordinate measuring machine auxiliary detection device according to any one of claims 1 to 3, characterized in that: It also includes a support column vertically arranged between the bottom of the product and the upper part of the base plate, the support column includes a column body and a support block, the lower end of the column body is placed on the base plate, the upper end of the support block is on the bottom of the product, a screw is also provided at the lower part of the support block, and the height of the support block is adjustable through the screw thread in the threaded hole in the middle of the upper end of the column body.

5. The three-coordinate measuring machine auxiliary detection device according to claim 4, characterized in that: The support block is a cylindrical structure and the screw rod and the support block are coaxially made into one piece. The upper part of the outer wall of the support block is also processed with a conical arc surface to reduce the contact area between the support block and the bottom of the product.

6. The three-coordinate measuring machine auxiliary detection device according to claim 5, characterized in that: The support columns are made of polyurethane or copper.

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