Workpiece quality and centroid detection device

Abstract

The utility model discloses a workpiece mass center detection device, which comprises a rack (1), and is characterized in that four weighing modules (2) are arranged at the front part of the rack (1), the four weighing modules (2) are respectively distributed at four corners of a rectangle, a bearing platform (3) is jointly supported above the four weighing modules (2), one end of the bearing platform (3) is provided with a pair of supporting mechanisms, and the other end of the bearing platform (3) is provided with a pair of positioning mechanisms. Two pairs of supporting mechanisms are arranged at the other end of the rack (1), a first position detection mechanism (4) and a second position detection mechanism (5) are arranged on the rear portion of the rack (1), and the first position detection mechanism (4) and the second position detection mechanism (5) are staggered in the X-axis direction.

Description

TECHNICAL FIELD

[0001] The utility model relates to product weighing field, especially a workpiece mass centroid detection device. BACKGROUND

[0002] In industrial production activities, the mass and centroid of workpieces are often detected, the detection of the centroid of workpieces with regular shapes is relatively simple and easy, the position of the centroid can be obtained by directly using the manual measurement and calculation mode, but for some workpieces with special shapes (irregular shapes) and large volumes, the manual measurement mode will consume a lot of manpower and material resources, and the final result also has a large deviation.

[0003] In order to solve the above problems, some devices capable of automatically detecting the centroid of products have appeared on the market, but these devices have poor universality and can only detect a certain specific workpiece, when the size specification of the measured workpiece changes, the centroid cannot be quickly, conveniently and accurately measured, and there is a certain limitation.

[0004] At the same time, the conventional device for detecting the centroid of products generally places the workpiece on a bearing platform, and a plurality of weighing modules are arranged below the bearing platform, in order to ensure the measurement accuracy, the bearing platform itself is an integral structure (rigid body) with high strength, when the temperature changes, the bearing platform itself will have a slight expansion or contraction, and this deformation will affect the final detection accuracy.

[0005] Therefore, a method or device capable of solving the above problems is needed. UTILITY MODEL CONTENT

[0006] The utility model discloses in order to solve the above -mentioned insufficient of prior art, propose a kind of simple structure, design is ingenious, layout is reasonable, the device of workpiece mass and centroid measurement can be quickly, conveniently and accurately realized, simultaneously, the device can also be adapted to the measurement of multiple different specifications workpieces.

[0007] The technical solution of the utility model is: a workpiece mass centroid detection device, including frame 1, characterized by: the front of frame 1 is provided with four weighing modules 2, four weighing modules 2 are distributed at the four corners of a rectangle respectively, and four weighing modules 2 are supported by bearing platform 3 above, one end of bearing platform 3 is provided with a pair of support mechanisms, the other end is provided with two pairs of support mechanisms, the rear of frame 1 is provided with first position detection mechanism 4 and second position detection mechanism 5, and first position detection mechanism 4 and second position detection mechanism 5 are staggered in X-axis direction,

[0008] The support mechanism comprises a base 6 fixedly connected with the bearing platform 3, a turnover block 7 rotatably supported on the base 6 through a rotating shaft, a T-shaped support block 8 arranged on one side of the turnover block 7, a bent support plate 9 arranged on a side adjacent to the T-shaped support block 8, a dividing pin 10 arranged on the base 6 and matched with the turnover block 7, and a pin hole arranged on an end surface of the turnover block 7 and matched with the dividing pin 10,

[0009] The first position detection mechanism 4 comprises a support column 11 fixedly connected with the rack 1, a Z-axis cylinder 12 arranged at the top of the support column 11, a working end of the Z-axis cylinder 12 connected with a Z-axis platform 13, an X-axis cylinder 14 arranged on the Z-axis platform 13, and an X-axis displacement sensor 15 arranged on a working end of the X-axis cylinder 14,

[0010] The second position detection mechanism 5 has the same structure as the first position detection mechanism 4,

[0011] A reference surface support 16 is further arranged at the middle part of the rack 1,

[0012] The weighing module 2, the Z-axis cylinder 12, the X-axis cylinder 14 and the X-axis displacement sensor 15 are all controlled by a control system, and a display screen 17 is arranged on the side of the rack 1 and connected with the control system.

[0013] Among the four weighing modules 2, one is a fixed weighing module 18, one is a semi-floating weighing module 19, and the other two are floating weighing modules 20, and the two floating weighing modules 20 are arranged at two ends of a diagonal line,

[0014] The fixed weighing module 18 comprises a bottom plate 21 fixedly connected with the rack 1, a sensor mechanism 22 arranged on the bottom plate 21, a connecting piece 23 connecting the sensor mechanism 22 with a bearing plate 24, a limiting groove 26 matched with a limiting end 25 of the connecting piece 23 arranged on the bottom surface of the bearing plate 24, and the limiting end 25 being circular in cross section,

[0015] The semi-floating weighing module 19 has the same structure as the fixed weighing module 18, but the limiting groove 26 is a long groove, the length of the limiting groove 26 in the X-axis direction is larger than the outer diameter of the limiting end 25, and the length of the limiting groove 26 in the Y-axis direction is matched with the outer diameter of the limiting end 25,

[0016] The floating weighing module 20 has the same structure as the fixed weighing module 18, but the inner diameter of the limiting groove 26 is larger than the outer diameter of the limiting end 25.

[0017] Compared with the prior art, the utility model has the advantages of:

[0018] The workpiece quality mass center detection device has the advantages of simple structure, ingenious design, reasonable layout, poor universality and less applicable workpiece specifications of traditional detection equipment, convenient and fast detection of quality and mass center of various workpieces, guaranteed precision of detection results, special design of different weighing modules, floating of some specific position weighing modules in a certain range, no stress in the whole weighing system when the bearing platform is deformed due to thermal expansion and cold contraction, and guaranteed precision of the final measurement results.

[0019] Meanwhile, the detection device has simple manufacturing process and low manufacturing cost, so it has multiple advantages and is particularly suitable for popularization and application in the field, and has very broad market prospect. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a perspective view of an embodiment of the utility model.

[0021] Figure 2 is a top view of an embodiment of the utility model.

[0022] Figure 3 is a structure schematic view of the first position detection mechanism in an embodiment of the utility model.

[0023] Figure 4 is a structure schematic view of the supporting mechanism in an embodiment of the utility model (working state one).

[0024] Figure 5 is a structure schematic view of the supporting mechanism in an embodiment of the utility model (working state two).

[0025] Figure 6 is a sectional view of the weighing module part in an embodiment of the utility model.

[0026] Figure 7 is a front view of an embodiment of the utility model. DETAILED DESCRIPTION

[0027] The specific implementation of the utility model will be described below with reference to the drawings. Figures 1 to 7The utility model discloses a workpiece quality centroid detection device, including a base frame 1 as the foundation, be provided with four weighing module 2 in the front of frame 1, four weighing module 2 is distributed at the four corners of a rectangle respectively, the upper of four weighing module 2 is supported together with the bearing platform 3, one end of bearing platform 3 is provided with a pair of support mechanism, the other end is provided with two pairs of support mechanism, the rear of frame 1 is provided with first position detection mechanism 4 and second position detection mechanism 5, and first position detection mechanism 4 and second position detection mechanism 5 are staggered with each other in the X axis direction,

[0028] The support mechanism includes a base 6 fixedly connected with the bearing platform 3, a turnover block 7 rotatably supported on the base 6 through a rotating shaft, a T-shaped support block 8 arranged on one side of the turnover block 7, a bent support plate 9 arranged on a side adjacent to the T-shaped support block 8, a dividing pin 10 arranged on the base 6 and matched with the turnover block 7, and a pin hole arranged on the end face of the turnover block 7 and matched with the dividing pin 10,

[0029] The first position detection mechanism 4 includes a support column 11 fixedly connected with the frame 1, a Z-axis cylinder 12 arranged at the top of the support column 11, a Z-axis platform 13 connected with the working end of the Z-axis cylinder 12, an X-axis cylinder 14 arranged on the Z-axis platform 13, and an X-axis displacement sensor 15 arranged on the working end of the X-axis cylinder 14,

[0030] The second position detection mechanism 5 has the same structure as the first position detection mechanism 4,

[0031] A reference surface support 16 is further arranged at the middle of the frame 1,

[0032] The weighing module 2, the Z-axis cylinder 12, the X-axis cylinder 14 and the X-axis displacement sensor 15 are uniformly controlled by a control system, and a display screen 17 is arranged on the side of the frame 1 and connected with the control system.

[0033] Among the four weighing modules 2, one is a fixed weighing module 18, one is a semi-floating weighing module 19, and the other two are floating weighing modules 20, and the two floating weighing modules 20 are arranged at the two ends of a diagonal line,

[0034] The fixed weighing module 18 includes a bottom plate 21 fixedly connected with the frame 1, a sensor mechanism 22 arranged on the bottom plate 21, a connecting piece 23 connecting the sensor mechanism 22 with a bearing plate 24, a limiting groove 26 matched with a limiting end 25 of the connecting piece 23 arranged on the bottom surface of the bearing plate 24, and the limiting end 25 being circular in cross section,

[0035] The structure of the semi-floating type weighing module 19 is same as the fixed type weighing module 18, but the limiting groove 26 is a long groove, the length of the limiting groove 26 in the X-axis direction is larger than the outer diameter of the limiting end head 25, and the length in the Y-axis direction matches the outer diameter of the limiting end head 25,

[0036] The structure of the floating type weighing module 20 is same as the fixed type weighing module 18, but the inner diameter of the limiting groove 26 is larger than the outer diameter of the limiting end head 25.

[0037] The working process of the workpiece mass centroid detection device is as follows: the workpiece to be detected in mass and centroid is hoisted to the device by a lifting tool, and is placed on the bearing platform 3, and the workpiece is supported by the support mechanisms at both ends, and according to the specific conditions of the support positions on the bottom surface of the workpiece, it is determined which two pairs of support mechanisms are used and the specific state of the support mechanisms;

[0038] After the workpiece is placed, the position detection mechanism measures the distance between the end surface of the workpiece and itself, and since the distance between the position detection mechanism and the reference surface support 16 is known, the distance between the end surface of the workpiece and the reference surface support 16 can be calculated by measuring the distance between the workpiece and the position detection mechanism, and the data of the distance is needed in the calculation of the centroid; since the effective measurement distance of the displacement sensor is limited, and the longer the distance, the greater the error, therefore, in actual operation, the displacement sensor will be as close to the measured workpiece as possible, therefore, during the operation of the device, it is determined whether the first position detection mechanism 4 or the second position detection mechanism 5 is used for the above detection according to the specific length of the workpiece, so as to ensure the detection accuracy; when the first position detection mechanism 4 is used for detection, the second position detection mechanism 5 is lowered to avoid interference with the measured workpiece;

[0039] After the workpiece is stabilized, the control system automatically calculates the mass and centroid of the workpiece according to the values detected by each weighing module 2, and combines the length of the workpiece, and outputs the results on the display screen 17;

[0040] When the workpiece is relatively short, a pair of support mechanisms at the right end of the bearing platform 3 and the inner side support mechanisms at the left end can be used to support the workpiece together, and when the workpiece is relatively long, a pair of support mechanisms at the right end of the bearing platform 3 and the outer side support mechanisms at the left end can be used to support the workpiece together; according to the specific structure of the supported part of the workpiece,

[0041] One end of the bearing platform 3 is provided with two pairs of support mechanisms, and when the workpiece is placed, the state of the support mechanism can be selected according to the length of the bottom surface of the workpiece, and when used, the index pin can be opened to drive the turnover block 7 to rotate, and the T-shaped support block 8 or the bent support plate 9 is selected to support the bottom surface of the workpiece, and then the turnover block 7 is locked by the index pin;

[0042] And different specifications of workpiece, and the detection mechanism corresponding to the detection end face position also varies, work can be used Z axis cylinder 12 to adjust the height of Z axis platform 13, through the X axis cylinder 14 adjustment X axis displacement sensor 15 in the X axis direction position, so as to ensure that the sensor can contact and detect the detection end face on the workpiece;

[0043] Because four weighing modules 2, only one is fixed weighing module 18, and other modules can be floating adjustment in a certain direction, a certain range, semi floating type weighing module 19 in the load plate 24 can be with the limit end 25 in the X axis direction of the shift, while the floating type weighing module 20 in the load plate 24 can be with the limit end 25 in the plane direction (X axis and Y axis) direction of the shift, that is, when the bearing 3 is pressed on the load plate 24 in the four weighing modules 2, if the bearing 3 due to thermal expansion or other reasons deformation, directly with the bottom surface of the bearing 3 contact load plate 24 can be with the deformation of the bearing 3 and make adaptive adjustment, so as to eliminate the internal stress of the bearing 3 itself, to ensure the accuracy of the measurement results.

[0044] It should be noted that when the total mass of the workpiece G is detected, and the pressure measured by each weighing module is known, the specific position of the center of gravity X0 of the workpiece can be calculated according to the formula as follows:

[0045] X0= ·L+b;

[0046] Where P Z3 and P Z4 are the pressure values detected by the fixed weighing module 18 and Figure 2 the floating type weighing module 20 near the right end, G is the total mass of the workpiece, L is the distance between the fixed weighing module 18 (rear force point) and its adjacent floating type weighing module 20 (front force point) in the X axis direction, and b is the distance between the front force point and the reference surface of the measured product.

Claims

1. A device for detecting the mass center of a workpiece, comprising a frame (1), characterized in that: The front part of the frame (1) is provided with four weighing modules (2), the four weighing modules (2) are distributed at four corners of a rectangle respectively, and the four weighing modules (2) are jointly supported by a bearing platform (3) above, one end of the bearing platform (3) is provided with a pair of supporting mechanisms, the other end is provided with two pairs of supporting mechanisms, the rear part of the frame (1) is provided with a first position detection mechanism (4) and a second position detection mechanism (5), and the first position detection mechanism (4) and the second position detection mechanism (5) are staggered in the X-axis direction, The supporting mechanism comprises a base (6) fixedly connected with the bearing platform (3), a turnover block (7) is rotatably supported on the base (6) through a rotating shaft, a T-shaped supporting block (8) is arranged on one side of the turnover block (7), a bent supporting plate (9) is arranged on the side adjacent to the T-shaped supporting block (8), a dividing pin (10) matched with the turnover block (7) is further arranged on the base (6), and a pin hole matched with the dividing pin (10) is arranged on the end face of the turnover block (7), The first position detection mechanism (4) comprises a supporting column (11) fixedly connected with the frame (1), a Z-axis cylinder (12) is arranged at the top of the supporting column (11), the working end of the Z-axis cylinder (12) is connected with a Z-axis platform (13), an X-axis cylinder (14) is arranged on the Z-axis platform (13), and an X-axis displacement sensor (15) is arranged on the working end of the X-axis cylinder (14), The structure of the second position detection mechanism (5) is the same as that of the first position detection mechanism (4), A reference surface support (16) is further arranged on the middle part of the frame (1), The weighing module (2), the Z-axis cylinder (12), the X-axis cylinder (14) and the X-axis displacement sensor (15) are uniformly controlled through a control system, and a display screen (17) is arranged on the side surface of the frame (1) and connected with the control system.

2. The workpiece mass centroid detection apparatus of claim 1, wherein: Among the four weighing modules (2), one is a fixed weighing module (18), one is a semi-floating weighing module (19), and two are floating weighing modules (20), and the two floating weighing modules (20) are distributed at the two ends of a diagonal line, The fixed weighing module (18) comprises a bottom plate (21) fixedly connected with the frame (1), a sensor mechanism (22) is arranged on the bottom plate (21), the sensor mechanism (22) is connected with a bearing plate (24) through a connecting piece (23), a limiting groove (26) matched with a limiting end (25) of the connecting piece (23) is formed in the bottom surface of the bearing plate (24), and the transverse section of the limiting end (25) is circular, The structure of the semi-floating weighing module (19) is the same as that of the fixed weighing module (18), but the limiting groove (26) is a long groove, the length of the limiting groove (26) in the X-axis direction is greater than the outer diameter of the limiting end (25), and the length of the limiting groove (26) in the Y-axis direction matches the outer diameter of the limiting end (25), The structure of the floating type weighing module (20) is same as that of the fixed type weighing module (18), but the inner diameter of the limiting groove (26) is greater than the outer diameter of the limiting end (25).

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