Loading mechanism for free combination of weight sets and dead weight machine

Abstract

The invention provides a loading mechanism for free combination of weight sets and a dead weight machine, the loading mechanism comprises a plurality of weight sets with different weight specifications and a weight loading and unloading assembly with rotating and lifting functions, the weight sets are placed at the top of the weight loading and unloading assembly, each weight set comprises a plurality of weight bodies, and the weight bodies are arranged on the weight loading and unloading assembly. The top end of each weight body is provided with a connecting disc, the connecting disc is connected with a hanging connector corresponding to the arc-shaped hanging groove, each weight body is provided with an arc-shaped hanging groove, and the arc-shaped hanging groove penetrates through the weight body along the radial direction of the weight body, so that the hanging connector can enter and exit from the arc-shaped hanging groove. Through mutual cooperation of rotation and lifting of the weight loading and unloading assembly, weight bodies on different weight sets are hung on the weight connecting mechanism at the same time, free selection of weights is achieved, combination of the weights is more diversified, and the dead weight machine can be matched with all calibration data in a force value calibration interval.

Description

Technical Field

[0001] The invention relates to the technical field of force sensor calibration equipment, and in particular to a loading mechanism and a static weight machine for free combination of weight groups. Background Art

[0002] A force sensor is a device that converts force signals into electrical signal outputs. It is widely used in 3C product testing, new energy product assembly, precision assembly, robotics and other industrial testing, measurement and control systems. Usually, force sensors need to be calibrated when in use to determine the input-output relationship of the force sensor. In the calibration process of the force sensor, the static weight machine is the key equipment. The static weight machine is mainly composed of a frame, a moving beam, a reverser, several groups of weights with different weight specifications, a weight tray for carrying the weight group, and a weight loading and unloading mechanism for driving the weight tray to lift and lower. Each group of weights contains multiple weights14. Such as Figure 1 As shown, each weight 14 in the weight group is provided with an axial cavity 1401 at its center, and the upper end of each weight is connected to a disk 15 matching the axial cavity, and the disk 15 is connected to a connector 16, which extends into the axial cavity 1401 of the weight above it and is slidably connected thereto. During calibration, according to the range of the force sensor to be tested, the weight tray is rotated to hang the required weight group on the reaction frame, and the weight loading and unloading mechanism drives the weight tray to move downward, so that the weights are loaded one by one on the reaction frame to perform a calibration test on the force sensor.

[0003] However, the existing weight structure makes it possible for the static weight machine to only take out and put in weights within the same group, and cannot take out weights from other groups at the same time, making it impossible for the static weight machine to match all calibration data within the force calibration range. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a loading mechanism and a static weight machine for free combination of weight groups, which can take out weights in different groups and realize free selection of weights.

[0005] The present invention is achieved in that:

[0006] In the first aspect, the present invention provides a loading mechanism for freely combining weight groups, which is arranged on a static weight machine, and the loading mechanism includes several weight groups with different weight specifications and a weight loading and unloading assembly with rotation and lifting functions. The weight groups are placed on the top of the weight loading and unloading assembly, and each of the weight groups includes several weight bodies. A connecting plate is installed on the top of each weight body, and the connecting plate is connected to a hanging connector corresponding to an arc-shaped hanging groove. Each weight body is provided with an arc-shaped hanging groove, and the arc-shaped hanging groove penetrates the weight body along the radial direction of the weight body, so that the hanging connector can enter and exit the arc-shaped hanging groove.

[0007] Furthermore, the center of the arc-shaped hanging groove coincides with the rotation center of the weight loading and unloading assembly.

[0008] Furthermore, the upper end of the hanging connector has a hanging block with an inverted cone structure, the inner wall of the arc-shaped hanging groove has an inclined surface matching the hanging block, and when the hanging connector moves downward in the vertical direction, the hanging block contacts the inclined surface.

[0009] Furthermore, the weight loading and unloading assembly includes a screw lift, a fixed bracket, a mounting plate, a rotating plate and a slewing assembly. The fixed bracket has a two-layer structure, the screw lift is arranged on the upper layer of the fixed bracket, the screw lift is connected to the mounting plate, a guide rod is arranged at the bottom of the mounting plate, the guide rod is slidably connected to the fixed bracket, the slewing assembly is arranged on the top of the mounting plate, the rotating plate is connected to the slewing assembly, and the weight group is arranged on the top of the rotating plate.

[0010] Furthermore, a first photoelectric sensor is provided on the mounting plate, and a plurality of induction sheets are provided on the rotating plate. The induction sheets correspond to the weight sets one by one, and the first photoelectric sensor monitors whether the rotating plate is rotated into place by sensing the induction sheets.

[0011] Furthermore, the rotating disk is provided with a second photoelectric sensor, the sensing end of the second photoelectric sensor is directed toward the fixed bracket, and the second photoelectric sensor monitors whether the hanging connector is hung in the hanging slot by sensing the height change of the rotating disk.

[0012] In a second aspect, the present invention provides a static weight machine, comprising a loading mechanism for free combination of weight groups as described in the first aspect, and also comprising a frame, a reverser and a moving beam, wherein the frame comprises a bottom plate, a middle beam and an upper beam, wherein the loading mechanism is arranged on the top of the bottom plate, wherein the bottom plate is rigidly connected to the middle beam through four columns, and wherein the middle beam is rigidly connected to the upper beam through four guide rods;

[0013] The middle beam and the upper beam are rotatably connected with a pair of screw rods, the movable beam is mounted on the screw rods through a nut sleeve, and a clamp for fixing the force sensor to be tested is arranged on the top of the movable beam;

[0014] The upper end of the deflector is hung on the upper beam and slidably connected to the upper beam. The lower end of the deflector is connected to a weight connection mechanism for grabbing the weight group. The lower end of the weight connection mechanism penetrates the middle beam and extends to the bottom of the middle beam.

[0015] Furthermore, a driving mechanism for driving the screw rod to rotate is arranged at the bottom of the center beam, and the driving mechanism includes a first servo motor, the first servo motor is connected to two reducers, and the reducers are connected to the screw rod.

[0016] Furthermore, the reverser is rigidly connected by an upper support, a pull rod and a lower support to form a frame structure, the upper support is hung on the upper beam, the lower end of the pull rod passes through the moving beam and extends to the lower end of the moving beam, and the weight connection mechanism is hung on the lower support and slidably connected to the lower support.

[0017] Furthermore, the weight connection mechanism includes a hanging rod connected to the lower support, the upper end of the hanging rod has an inverted cone-shaped connecting portion, the connecting portion is used to hang the hanging rod on the lower support, the lower end of the hanging rod is provided with a hanging portion, the hanging portion is provided with a hanging groove matching the hanging connector, when the weight group is loaded, the hanging connector located at the top is connected to the hanging groove.

[0018] The advantages of the present invention are:

[0019] By coordinating the rotation and lifting of the weight loading and unloading assembly, the weight bodies on different weight groups can be hung on the weight connecting mechanism at the same time, so that the weights can be freely selected and the combination of weights is more diverse, so that the static weight machine can match all calibration data within the force calibration range.

[0020] The first photoelectric sensor monitors whether the rotating disk is rotated to the right position to monitor whether the hanging connector is accurately moved into the hanging slot. The second photoelectric sensor senses the height change of the rotating disk to monitor whether the hanging connector is in contact with the inclined surface in the arc hanging slot to monitor whether the weight body is loaded on the force sensor to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0022] Figure 1 It is a structural schematic diagram of a weight group in the prior art.

[0023] Figure 2 The present invention is a schematic diagram of a loading mechanism structure for free combination of weight groups.

[0024] Figure 3 It is a schematic diagram of the connection structure of the weight bodies in the same group of the present invention.

[0025] Figure 4 It is a schematic diagram of the structure of the weight body of the present invention.

[0026] Figure 5 for Figure 4 A partial enlarged view of point A in the middle.

[0027] Figure 6 It is a schematic diagram of the bottom structure of the weight body of the present invention.

[0028] Figure 7 It is a partial structural schematic diagram of weight groups of different weight specifications placed on the top of the weight loading and unloading assembly of the present invention.

[0029] Figure 8 for Figure 2 Exploded view of the structure shown.

[0030] Fig. 9 It is a partial structural schematic diagram of different groups of weight sets hung at the weight connecting mechanism of the present invention.

[0031] Fig.10 It is a schematic diagram of the structure of the static weight machine of the present invention.

[0032] Fig.11 The local structure of the static weight machine of the present invention is shown in FIG. Figure 1 .

[0033] Fig.12 The local structure of the static weight machine of the present invention is shown in FIG. Figure 2 .

[0034] Fig.13 It is a schematic diagram of the connection structure between the reverser and the weight connection mechanism of the present invention.

[0035] Description of the numbers in the figure:

[0036] 1. Weight set; 101. Weight body; 1011. Arc hanging groove; 1012. Inclined surface; 102. Connecting plate; 103. Hanging connector; 104. Hanging block; 2. Weight loading and unloading assembly; 201. Screw lift; 202. Fixed bracket; 203. Mounting plate; 204. Rotating plate; 205. Rotating assembly; 206. Second servo motor; 207. Guide rod; 3. First photoelectric sensor; 4. Induction Plate; 5. second photoelectric sensor; 6. frame; 61. bottom plate; 62. middle beam; 63. upper beam; 7. reverser; 71. upper support; 72. pull rod; 73. lower support; 8. moving beam; 9. guide rod; 10. screw rod; 11. clamp; 12. weight connecting mechanism; 121. hanging rod; 122. connecting part; 123. hanging part; 13. driving mechanism; 131. first servo motor; 132. reducer. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings and specific implementation methods. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions, directions or positional relationships based on the positions, directions or positional relationships shown in the accompanying 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 position, direction or position, be constructed and operated in a specific position, direction or position, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] For example, see Figures 1 to 9 The present invention provides a loading mechanism 100 for free combination of weight groups, which is arranged on a static weight machine 200. The loading mechanism includes a plurality of weight groups 1 with different weight specifications and a weight loading and unloading assembly 2 with rotation and lifting functions. The weight group 1 is placed on the top of the weight loading and unloading assembly 2. The plurality of weight groups 1 are arranged in a ring array with the rotation center of the weight loading and unloading assembly 2 as the axis. Each of the weight groups 1 includes a plurality of weight bodies 101, and the weight bodies 101 are circular. shaped structure, a connecting plate 102 is installed on the top of each weight body 101, and the connecting plate 102 is connected to a hanging connector 103 corresponding to the arc-shaped hanging groove 1011, and each weight body 101 is provided with an arc-shaped hanging groove 1011, and the arc-shaped hanging groove 1011 passes through the center of the weight body 101, and the arc-shaped hanging groove 1011 penetrates the weight body 101 along the radial direction of the weight body 101, so that the hanging connector 103 can enter and exit the arc-shaped hanging groove 1011.

[0040] The weight loading and unloading assembly 2 is rotated and lifted in coordination with each other to realize that the weight bodies 101 on different weight groups 1 are simultaneously hung on the weight connection mechanism 12, so that the weights can be freely selected. Taking four groups of weight groups 1 with different weights as an example, the first group of weight groups 1 is composed of ten 1N weight bodies 101, the second group of weight groups 1 is composed of ten 2N weight bodies 101, the third group of weight groups 1 is composed of ten 3N weight bodies 101, and the fourth group of weight groups 1 is composed of ten 5N weight bodies 101;

[0041] As shown in the figure, after the weight connection mechanism 12 grabs the top weight body in the first weight group, the weight loading and unloading assembly 2 rotates to make each weight group rotate synchronously. At this time, the second weight body in the first weight group is separated from the first weight body. Subsequently, the weight loading and unloading assembly 2 rotates and lifts to gradually move the top weight body in the second weight group to the bottom of the first weight body in the first weight group, and hangs it on the first weight body in the first weight group, so that the weight bodies in different groups are loaded at the same time. Similarly, repeat the above operation and hang the weight bodies of any weight group on the weight connection mechanism 12 at the same time.

[0042] If each of the four weight groups 1 has a weight body 101 hung at the weight connection mechanism 12, then the weight group 1 can generate a loading force of 11N to load the force sensor under test. Compared with the prior art, the weight structure of the present invention can make the combination of weights more diverse, so that the static weight machine can match all calibration data within the force value calibration range.

[0043] Specifically, the center of the arc-shaped hanging groove 1011 coincides with the rotation center of the weight loading and unloading assembly 2 .

[0044] Specifically, the upper end of the hanging connector 103 has a hanging block 104 with an inverted cone structure, and the inner wall of the arc-shaped hanging groove 1011 has an inclined surface 1012 matching the hanging block 104. When the hanging connector 103 moves downward in the vertical direction, the hanging block 104 contacts the inclined surface 1012. Taking two upper and lower adjacent weight bodies 101 as an example, in the initial state, the hanging block 104 does not contact the inclined surface 1012, then at this time, the lower weight body 101 is in an unloaded state. When the output end of the weight loading and unloading assembly 2 is retracted, the weight body 101 gradually falls, so that the hanging block 104 contacts the inclined surface 1012. At this time, the weight body 101 located at the lower end is hung on the lower end of the upper weight body 101, and the weight body 101 located at the lower end is in a loaded state.

[0045] Specifically, the weight loading and unloading assembly 2 includes a screw lift 201, a fixed bracket 202, a mounting plate 203, a rotating plate 204 and a rotary assembly 205. The fixed bracket 202 has a two-layer structure, the screw lift 201 is arranged on the upper layer of the fixed bracket 202, the screw lift 201 is connected to the mounting plate 203, the output end of the screw lift 201 is connected to the bottom of the mounting plate 203, the screw lift 201 is driven by a second servo motor 206, a guide rod 207 is arranged at the bottom of the mounting plate 203, the guide rod 207 is slidably connected to the fixed bracket 202, the rotary assembly 205 is arranged on the top of the mounting plate 203, the rotating plate 204 is connected to the rotary assembly 205, and the weight group 1 is arranged on the top of the rotating plate 204. The rotary assembly 205 is an electric turntable. By controlling the rotation of the rotary assembly 205, the combined weight body 101 is rotated to the weight connecting mechanism 12 successively. After the weight loading and unloading assembly 2 is lowered, the weight body 101 is hung at the weight connecting mechanism 12 to test and calibrate the force sensor being tested.

[0046] Specifically, the mounting disk 203 is provided with a first photoelectric sensor 3, the rotating disk 204 is provided with a plurality of sensing sheets 4, the sensing sheets 4 correspond to the weight sets 1 one by one, and the first photoelectric sensor 3 senses the sensing sheets 4 to monitor whether the rotating disk 204 is rotated into place.

[0047] Specifically, the rotating disk 204 is provided with a second photoelectric sensor 5 , the sensing end of the second photoelectric sensor 5 faces the fixed bracket 202 , and the second photoelectric sensor 5 monitors whether the hanging connector 103 is hung in the hanging slot by sensing the height change of the rotating disk 204 .

[0048] For example 2, please refer to Figures 1 to 13 The present invention provides a static weight machine, comprising a loading mechanism for free combination of a weight group 1 as described in the first embodiment, and also comprising a frame 6, a reverser 7 and a moving beam 8, wherein the frame 6 comprises a bottom plate 61, a middle beam 62 and an upper beam 63, wherein the loading mechanism is arranged on the top of the bottom plate 61, wherein the bottom plate 61 is rigidly connected to the middle beam 62 through four columns, and wherein the middle beam 62 is rigidly connected to the upper beam 63 through four guide rods 9;

[0049] The middle beam 62 and the upper beam 63 are rotatably connected with a pair of screw rods 10, the moving beam 8 is mounted on the screw rods 10 through a nut sleeve, and a clamp 11 for fixing the force sensor to be tested is provided on the top of the moving beam 8;

[0050] The upper end of the deflector 7 is hung on the upper beam 63 and is slidably connected to the upper beam 63 . The lower end of the deflector 7 is connected to a weight connecting mechanism 12 for grabbing the weight group 1 . The lower end of the weight connecting mechanism 12 penetrates the middle beam 62 and extends to the bottom of the middle beam 62 .

[0051] Specifically, a driving mechanism 13 for driving the screw rod 10 to rotate is disposed at the bottom of the middle beam 62 . The driving mechanism 13 includes a first servo motor 131 . The first servo motor 131 is connected to two reducers 132 . The reducers 132 are connected to the screw rod 10 .

[0052] After the force sensor to be tested is placed on the fixture 11, the driving mechanism 13 drives the screw 10 to rotate, causing the movable beam 8 to rise until the force sensor to be tested contacts the reverser 7, and lifts the reverser 7 so that it is no longer hung on the upper beam 63. At this time, the load of the reverser 7 under the action of the gravity of the reverser 7 is loaded on the force sensor to be tested.

[0053] When the weight set 1 is hung on the weight connection mechanism 12, the load of the deflector 7 and the weight body 101 are jointly loaded on the force sensor to be tested.

[0054] Specifically, the deflector 7 is rigidly connected to form a frame structure by an upper support 71, a pull rod 72 and a lower support 73, the upper support 71 is hung on the upper beam 63, the lower end of the pull rod 72 passes through the moving beam 8 and extends to the lower end of the moving beam 8, and the weight connection mechanism 12 is hung on the lower support 73 and slidably connected to the lower support 73. The deflector 7 is made of carbon fiber.

[0055] Specifically, the weight connecting mechanism 12 includes a hanging rod 121 connected to the lower support 73, the hanging rod 121 is slidably connected to the lower support 73, the upper end of the hanging rod 121 has an inverted cone-shaped connecting portion 122, the connecting portion 122 is used to hang the hanging rod 121 on the lower support 73, the lower end of the hanging rod 121 is provided with a hanging portion 123, the hanging portion 123 is provided with a hanging groove matching the hanging connector 103, when the weight group 1 is loaded, the hanging connector 103 located at the top is connected to the hanging groove.

[0056] The advantages of the present invention are: through the rotation and lifting of the weight loading and unloading assembly 2, the weight bodies 101 on different weight groups 1 are simultaneously hung on the weight connection mechanism 12, the weights can be freely selected, and the combination of weights is more diverse, so that the static weight machine can match all calibration data within the force value calibration interval. The first photoelectric sensor 3 monitors whether the rotating disk 204 is rotated into place to monitor whether the hanging connector 103 is accurately moved into the hanging slot. The second photoelectric sensor 5 monitors whether the hanging connector 103 contacts the inclined surface 1012 in the arc hanging slot 1011 by sensing the height change of the rotating disk 204, so as to monitor whether the weight body is loaded on the force sensor to be tested.

[0057] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent substitutions and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A loading mechanism for free combination of weight groups, characterized in that: Arranged on a static weight machine, the loading mechanism includes a plurality of weight groups with different weight specifications and a weight loading and unloading assembly with rotating and lifting functions, the weight groups are placed on the top of the weight loading and unloading assembly, each of the weight groups includes a plurality of weight bodies, a connecting plate is installed on the top of each weight body, the connecting plate is connected to a hanging connector corresponding to the arc-shaped hanging groove, each of the weight bodies is provided with an arc-shaped hanging groove, the arc-shaped hanging groove penetrates the weight body along the radial direction of the weight body, so that the hanging connector can enter and exit the arc-shaped hanging groove.

2. A loading mechanism for free combination of weight sets as claimed in claim 1, characterized in that: The center of the arc hanging groove coincides with the rotation center of the weight loading and unloading assembly.

3. A loading mechanism for free combination of weight sets as claimed in claim 1, characterized in that: The upper end of the hanging connector has a hanging block with an inverted cone structure, the inner wall of the arc-shaped hanging groove has an inclined surface matching the hanging block, and when the hanging connector moves downward in the vertical direction, the hanging block contacts the inclined surface.

4. A loading mechanism for free combination of weight sets as claimed in claim 1, characterized in that: The weight loading and unloading assembly includes a screw lift, a fixed bracket, a mounting plate, a rotating plate and a slewing assembly. The fixed bracket has a two-layer structure. The screw lift is arranged on the upper layer of the fixed bracket. The screw lift is connected to the mounting plate. A guide rod is arranged at the bottom of the mounting plate. The guide rod is slidably connected to the fixed bracket. The slewing assembly is arranged on the top of the mounting plate. The rotating plate is connected to the slewing assembly, and the weight group is arranged on the top of the rotating plate.

5. A loading mechanism for free combination of weight sets as claimed in claim 4, characterized in that: The installation disk is provided with a first photoelectric sensor, and the rotating disk is provided with a plurality of induction sheets, and the induction sheets correspond to the weight sets one by one. The first photoelectric sensor monitors whether the rotating disk is rotated into place by sensing the induction sheets.

6. A loading mechanism for free combination of weight sets as claimed in claim 4, characterized in that: The rotating disk is provided with a second photoelectric sensor, the sensing end of the second photoelectric sensor faces the fixed bracket, and the second photoelectric sensor monitors whether the hanging connector is hung in the hanging groove by sensing the height change of the rotating disk.

7. A static weight machine, characterized in that: A loading mechanism for free combination of weight groups as claimed in any one of claims 1 to 6, further comprising a frame, a reverser and a moving beam, wherein the frame comprises a bottom plate, a middle beam and an upper beam, wherein the loading mechanism is arranged on the top of the bottom plate, wherein the bottom plate is rigidly connected to the middle beam through four columns, and wherein the middle beam is rigidly connected to the upper beam through four guide rods; The middle beam and the upper beam are rotatably connected with a pair of screw rods, the movable beam is mounted on the screw rods through a nut sleeve, and a clamp for fixing the force sensor to be tested is arranged on the top of the movable beam; The upper end of the deflector is hung on the upper beam and slidably connected to the upper beam. The lower end of the deflector is connected to a weight connection mechanism for grabbing the weight group. The lower end of the weight connection mechanism penetrates the middle beam and extends to the bottom of the middle beam.

8. A static weight machine as claimed in claim 7, characterized in that: A driving mechanism for driving the screw rod to rotate is arranged at the bottom of the middle beam, and the driving mechanism includes a first servo motor, the first servo motor is connected to two reducers, and the reducers are connected to the screw rod.

9. A static weight machine as claimed in claim 7, characterized in that: The reverser is rigidly connected by an upper support, a pull rod and a lower support to form a frame structure. The upper support is hung on the upper beam, the lower end of the pull rod passes through the moving beam and extends to the lower end of the moving beam, and the weight connection mechanism is hung on the lower support and slidably connected to the lower support.

10. A static weight machine as claimed in claim 9, characterized in that: The weight connection mechanism includes a hanging rod connected to the lower support, the upper end of the hanging rod has an inverted cone-shaped connecting portion, the connecting portion is used to hang the hanging rod on the lower support, the lower end of the hanging rod is provided with a hanging portion, the hanging portion is provided with a hanging groove matching the hanging connector, when the weight group is loaded, the hanging connector located at the top is connected to the hanging groove.

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