Closed-loop force control size measuring device

Abstract

The invention provides a closed-loop force control size measuring device, and belongs to the technical field of measuring equipment. Comprising a measuring table, a clamping assembly, a driving piece and a distance measuring piece, a base is arranged above the measuring table; the first measuring plate is arranged at the bottom of the measuring space, a driving groove is formed in the measuring table, the driving plate is slidably connected to the base, the bottom of the driving plate penetrates through the driving groove and extends into the measuring space, the second measuring plate is installed at the bottom of the driving plate, and a force sensor is arranged on the driving plate; the driving piece is installed on the base, a pushing block is arranged at the output end of the driving piece, and the pushing block is connected with the force sensor; the distance measuring piece is installed on the base and used for measuring the moving distance of the driving plate. By controlling the pressure applied to the soft workpiece by the second measuring plate to be kept unchanged, the accuracy of size measurement of the soft workpiece is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of measuring equipment, and in particular relates to a closed-loop force-controlled dimension measuring device. Background Art

[0002] When measuring the dimensions of soft workpieces, the forces applied by the measuring device vary due to the workpiece's characteristics, resulting in different measured dimensions. Therefore, it's necessary to control the measuring pressure during measurement to obtain constant pressure. Current measuring devices use an extension mechanism to contact the workpiece, and a displacement sensor measures the workpiece's dimensions. However, the measuring device can't effectively control the pressure applied by the extension mechanism, resulting in inconsistent pressures on the workpiece, ultimately leading to inaccurate dimensional measurements for these soft workpieces. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention provides a closed-loop force-controlled dimension measuring device. The technical problem to be solved by the present invention is: how to ensure accurate dimension measurement of soft workpieces.

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

[0005] A closed-loop force-controlled dimension measuring device, comprising:

[0006] A measuring platform, wherein the measuring platform has a measuring space therein and a base is provided above the measuring platform;

[0007] a clamping assembly comprising a first measuring plate, a second measuring plate, and a driving plate, wherein the first measuring plate is disposed at the bottom of the measuring space, a driving slot is provided on the measuring table, the driving plate is slidably connected to the base, and the bottom of the driving plate passes through the driving slot and extends into the measuring space, the second measuring plate is mounted on the bottom of the driving plate, and a force sensor is provided on the driving plate;

[0008] A driving member, the driving member is mounted on the base, a pushing block is provided at an output end of the driving member, the pushing block is connected to the force sensor, and the pushing block is driven by the driving member to move the driving plate;

[0009] A distance measuring component is installed on the base and is used to measure the distance moved by the driving plate.

[0010] In the above-mentioned closed-loop force-controlled dimension measuring device, the measuring platform includes a base plate, a first side plate, a second side plate and a top plate, the first side plate and the second side plate are fixedly connected to the base plate, the top plate is fixedly connected to the first side plate and the second side plate, the base plate, the first side plate, the second side plate and the top plate enclose the measuring space, the driving groove is arranged on the top plate, and the first measuring plate is arranged on the base plate.

[0011] In the above-mentioned closed-loop force-controlled dimension measuring device, the driving member is a linear module, the linear module is installed in the base, and the pushing block is arranged at the output end of the linear module.

[0012] In the above-mentioned closed-loop force-controlled dimension measuring device, a square groove is provided on the driving plate, the force sensor is installed at the bottom of the square groove, and the pushing block is located in the square groove.

[0013] In the above-mentioned closed-loop force-controlled dimension measuring device, the clamping assembly further includes a connecting plate, the connecting plate is mounted on the bottom of the driving plate, and the second measuring plate is mounted on the connecting plate.

[0014] In the above-mentioned closed-loop force-controlled dimension measuring device, the clamping assembly further includes two ribs, the two ribs are respectively fixedly connected to the two sides of the bottom of the driving plate, and the connecting plate is fixedly connected to the two ribs.

[0015] In the above-mentioned closed-loop force-controlled dimension measuring device, the rib plate includes a vertically arranged fixing portion and a connecting portion, the fixing portion is fixedly connected to the driving plate, and the connecting plate is fixedly connected to the connecting portion.

[0016] In the above-mentioned closed-loop force-controlled dimension measuring device, the first measuring plate has a first measuring surface, the second measuring plate has a second measuring surface, the first measuring surface and the second measuring surface are arranged opposite to each other, and a soft workpiece to be measured can be clamped between the first measuring surface and the second measuring surface.

[0017] In the above-mentioned closed-loop force-controlled dimension measuring device, the closed-loop force-controlled dimension measuring device also includes a limit assembly, which includes a photoelectric tube and a sensor sheet. The photoelectric tube is installed on the base, and the sensor sheet is installed on the driving board.

[0018] In the above-mentioned closed-loop force-controlled dimension measuring device, the distance measuring component is a grating scale sensor, and the grating scale sensor is used to measure the distance moved by the driving plate.

[0019] Beneficial effects of the present invention:

[0020] When measuring the dimensions of similar soft workpieces, the present invention maintains a constant pressure applied by the second measuring plate on the workpiece. The distance between the second measuring plate and the first measuring plate minus the distance traveled by the driving plate is then used to determine the dimensions of the workpiece. By maintaining a constant pressure applied by the second measuring plate on the workpiece, the accuracy of the workpiece dimensional measurement is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of a closed-loop force-controlled dimension measuring device;

[0022] Figure 2 This is a schematic structural diagram of the closed-loop force-controlled dimension measuring device from another perspective;

[0023] Figure 3 It is a structural diagram of the connection between the driving member and the clamping assembly;

[0024] Figure 4 This is a schematic diagram of the structure of the measuring platform;

[0025] Figure 5 This is a structural diagram of the driver board.

[0026] In the figure, 1. measuring table; 11. measuring space; 12. base; 13. driving groove; 14. bottom plate; 15. first side plate; 16. second side plate; 17. top plate; 2. clamping assembly; 21. first measuring plate; 211. first measuring surface; 22. second measuring plate; 221. second measuring surface; 23. driving plate; 231. square groove; 24. force sensor; 25. connecting plate; 26. rib plate; 261. fixing part; 262. connecting part; 3. driving member; 31. pushing block; 4. distance measuring member; 5. limiting assembly; 51. photoelectric tube; 52. induction sheet. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] like Figure 1-3As shown, this embodiment provides a closed-loop force-controlled dimension measuring device, including a measuring platform 1, a clamping assembly 2, a driving member 3 and a distance measuring member 4; the measuring platform 1 has a measuring space 11, and a base 12 is provided above the measuring platform 1; the clamping assembly 2 includes a first measuring plate 21, a second measuring plate 22 and a driving plate 23, the first measuring plate 21 is provided at the bottom of the measuring space 11, the measuring platform 1 is provided with a driving slot 13, the driving plate 23 is slidably connected to the base 12, and the bottom of the driving plate 23 passes through the driving slot 13. The groove 13 extends into the measuring space 11, the second measuring plate 22 is mounted on the bottom of the driving plate 23, and a force sensor 24 is provided on the driving plate 23; the driving member 3 is mounted on the base 12, and a pushing block 31 is provided at the output end of the driving member 3, and the pushing block 31 is connected to the force sensor 24. The pushing block 31 is driven by the driving member 3 to move the driving plate 23; the distance measuring member 4 is mounted on the base 12, and the distance measuring member 4 is used to measure the distance moved by the driving plate 23.

[0030] In this embodiment, the measuring table 1 has a measuring space 11, and the soft workpiece to be tested can be measured in the measuring space 11; the first measuring plate 21 is arranged at the bottom of the measuring space 11, the bottom of the driving plate 23 passes through the driving slot 13 and extends into the measuring space 11, and the second measuring plate 22 is installed at the bottom of the driving plate 23, that is, the second measuring plate 22 is also in the measuring space 11, and the first measuring plate 21 and the second measuring plate 22 are arranged opposite to each other, and the centers of the first measuring plate 21 and the second measuring plate 22 are located on the same vertical line, ensuring that the soft workpiece is clamped flatly; the driving member 3 can push the driving plate 23 to slide along the base 12, thereby realizing the up and down movement of the second measuring plate 22 in the measuring space 11. When measuring the dimensions of a soft workpiece, the workpiece is placed on the first measuring plate 21. It should be noted that, in the initial position before measurement, the distance H between the second measuring plate 22 and the first measuring plate 21 is fixed. After the workpiece is placed on the first measuring plate 21, the driver 3 drives the push block 31, which pushes the force sensor 24, thereby pushing the drive plate 23 downward. The second measuring plate 22 then moves toward the first measuring plate 21. After the workpiece is pressed together, a closed force loop is achieved. The value of the force sensor 24 is now F. The distance measuring device 4 measures the distance of the drive plate 23 as L, and the dimension of the soft workpiece is calculated as D = HL. When measuring the dimensions of similar soft workpieces, the pressure applied by the second measuring plate 22 on the workpiece is maintained constant, that is, the value F of the force sensor 24 is maintained constant. The dimension D of the similar soft workpiece is then calculated by subtracting the distance L of the drive plate 23 from the distance H between the second measuring plate 22 and the first measuring plate 21. This closed-loop force-controlled dimensional measurement device ensures accurate dimensional measurement of soft workpieces by maintaining a constant pressure applied by the second measuring plate 22. In one embodiment, both the first measuring plate 21 and the second measuring plate 22 are marble slabs, ensuring that their opposing surfaces are perfectly flat.

[0031] like Figure 4 As shown, the measuring platform 1 includes a bottom plate 14, a first side plate 15, a second side plate 16 and a top plate 17, the first side plate 15 and the second side plate 16 are fixedly connected to the bottom plate 14, and the top plate 17 is fixedly connected to the first side plate 15 and the second side plate 16. The bottom plate 14, the first side plate 15, the second side plate 16 and the top plate 17 enclose the measuring space 11, the driving groove 13 is arranged on the top plate 17, and the first measuring plate 21 is arranged on the bottom plate 14.

[0032] In this embodiment, the bottom plate 14, the first side plate 15, the second side plate 16 and the top plate 17 enclose a measuring space 11, the driving groove 13 is provided on the top plate 17, and the first measuring plate 21 is provided on the bottom plate 14. The driving plate 23 passes through the driving groove 13 on the top plate 17 and extends into the measuring space 11, so that the driving plate 23 drives the second measuring plate 22 to move in the measuring space 11. When the size of the soft workpiece needs to be measured, the driving plate 23 drives the second measuring plate 22 to move toward the first measuring plate 21 provided on the bottom plate 14, so that the first measuring plate 21 and the second measuring plate 22 clamp the soft workpiece, thereby realizing the size measurement of the soft workpiece.

[0033] like Figure 1-3 As shown, the driving member 3 is a linear module, which is installed in the base 12, and the pushing block 31 is arranged at the output end of the linear module.

[0034] In this embodiment, the driving member 3 is a linear module, which can drive the screw to rotate through a driving motor, and then drive the pushing block 31 to move along the screw, so that the pushing block 31 drives the driving plate 23 to move up and down, thereby realizing the size measurement of the soft workpiece.

[0035] like Figure 1 、 2 As shown in , 3 and 5 , a square groove 231 is provided on the driving plate 23 , the force sensor 24 is installed at the bottom of the square groove 231 , and the pushing block 31 is located in the square groove 231 .

[0036] In this embodiment, the force sensor 24 is installed in the square groove 231, the pushing block 31 is located in the square groove 231, the linear module drives the pushing block 31 to move, the pushing block 31 carries the power sensor 24, and the force sensor 24 drives the driving plate 23 to move, thereby driving the second measuring side to move up and down; when it is necessary to measure the size of the soft workpiece, the second measuring plate 22 presses the soft workpiece, and at this time pushes the quick pressure holding force sensor 24 to form a force closed loop. The value of the force sensor 24 is F. When measuring other soft workpieces, the value F of the force sensor 24 is guaranteed, that is, the pressure of the second measuring plate 22 on the soft workpiece remains unchanged at F, thereby ensuring the accuracy of the measurement of the soft workpiece.

[0037] like Figure 3 As shown, the clamping assembly 2 further includes a connecting plate 25 , which is mounted on the bottom of the driving plate 23 , and the second measuring plate 22 is mounted on the connecting plate 25 .

[0038] In this embodiment, the second measuring plate 22 is mounted on the connecting plate 25 and is mounted on the bottom of the driving plate 23 , ensuring that when the second measuring plate 22 moves, all angles of the second measuring plate 22 move synchronously, thereby reducing measurement errors for soft workpieces.

[0039] like Figure 3 As shown, the clamping assembly 2 further includes two ribs 26, which are respectively fixedly connected to the two sides of the bottom of the driving plate 23, and the connecting plate 25 is fixedly connected to the two ribs 26. The ribs 26 include a vertically arranged fixing portion 261 and a connecting portion 262. The fixing portion 261 is fixedly connected to the driving plate 23, and the connecting plate 25 is fixedly connected to the connecting portion 262.

[0040] In this embodiment, two ribs 26 are fixedly connected to the two sides of the bottom of the driving plate 23, and the connecting plate 25 is fixedly connected to the two ribs 26. Both ribs 26 are located below the top plate 17, which connects and fixes the connecting plate 25, thereby facilitating the fixed connection of the second measuring plate 22.

[0041] like Figure 2 and 3 As shown, the first measuring plate 21 has a first measuring surface 211 , and the second measuring plate 22 has a second measuring surface 221 . The first measuring surface 211 and the second measuring surface 221 are arranged opposite to each other, and a soft workpiece to be measured can be clamped between the first measuring surface 211 and the second measuring surface 221 .

[0042] In this embodiment, the first measuring surface 211 and the second measuring surface 221 are arranged opposite to each other, and the first measuring surface 211 and the second measuring surface 221 are parallel surfaces. When a soft workpiece needs to be measured, the first measuring surface 211 and the second measuring surface remain flat when clamping the soft workpiece, resulting in less measurement error.

[0043] like Figure 1 and 3 As shown, the closed-loop force-controlled dimension measuring device further includes a limit assembly 5 , which includes a photoelectric tube 51 and a sensor sheet 52 . The photoelectric tube 51 is mounted on the base 12 , and the sensor sheet 52 is mounted on the driving plate 23 .

[0044] In this embodiment, a photoelectric tube 51 is mounted on the base 12, and a sensing plate 52 is mounted on the drive plate 23. The photoelectric tube 51 and the sensing plate 52 are located above the base 12 and the drive plate 23, respectively. When the drive plate 23 moves upward, the sensing plate 52 blocks the photoelectric tube 51, causing the drive motor to stop driving the lead screw, i.e., the drive plate 23 stops moving upward. At this point, the second measurement plate 22 is at its highest point within the measurement space 11, i.e., the distance between the second measurement plate 22 and the first measurement plate 21 is H. The photoelectric tube 51 and the sensing plate 52 limit the upward movement of the drive plate 23, ensuring the highest position of the second measurement plate 22, thereby ensuring the accuracy of the calculation of D=HL for the dimensions of soft workpieces.

[0045] like Figure 1-3 As shown, the distance measuring member 4 is a grating ruler sensor, which is used to measure the distance moved by the driving plate 23.

[0046] In this embodiment, the distance measuring element 4 is a grating ruler sensor. Of course, the distance measuring element 4 can also be an infrared displacement sensor or a laser displacement sensor, etc., which is not limited here.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be covered by the scope of the claims of the present invention.

Claims

1. A closed-loop force-controlled dimension measuring device, characterized in that: include: A measuring platform (1), wherein the measuring platform (1) has a measuring space (11) therein, and a base (12) is provided above the measuring platform (1); A clamping assembly (2), the clamping assembly (2) comprising a first measuring plate (21), a second measuring plate (22) and a driving plate (23), the first measuring plate (21) being arranged at the bottom of the measuring space (11), the measuring table (1) being provided with a driving slot (13), the driving plate (23) being slidably connected to the base (12), and the bottom of the driving plate (23) passing through the driving slot (13) and extending into the measuring space (11), the second measuring plate (22) being mounted on the bottom of the driving plate (23), and the driving plate (23) being provided with a force sensor (24); A driving member (3), the driving member (3) being mounted on the base (12), the output end of the driving member (3) being provided with a pushing block (31), the pushing block (31) being connected to the force sensor (24), and the pushing block (31) being driven by the driving member (3) to move the driving plate (23); A distance measuring member (4) is mounted on the base (12), and the distance measuring member (4) is used to measure the distance moved by the driving plate (23).

2. The closed-loop force-controlled dimension measuring device according to claim 1, characterized in that: The measuring platform (1) comprises a bottom plate (14), a first side plate (15), a second side plate (16) and a top plate (17); the first side plate (15) and the second side plate (16) are fixedly connected to the bottom plate (14); the top plate (17) is fixedly connected to the first side plate (15) and the second side plate (16); the bottom plate (14), the first side plate (15), the second side plate (16) and the top plate (17) enclose the measuring space (11); the driving slot (13) is arranged on the top plate (17); and the first measuring plate (21) is arranged on the bottom plate (14).

3. The closed-loop force-controlled dimension measuring device according to claim 1, characterized in that: The driving member (3) is a linear module, the linear module is installed in the base (12), and the pushing block (31) is arranged at the output end of the linear module.

4. The closed-loop force-controlled dimension measuring device according to claim 1, characterized in that: A square groove (231) is provided on the driving plate (23), the force sensor (24) is installed at the bottom of the square groove (231), and the pushing block (31) is located in the square groove (231).

5. The closed-loop force-controlled dimension measuring device according to claim 1, characterized in that: The clamping assembly (2) further comprises a connecting plate (25), wherein the connecting plate (25) is mounted on the bottom of the driving plate (23), and the second measuring plate (22) is mounted on the connecting plate (25).

6. The closed-loop force-controlled dimension measuring device according to claim 5, characterized in that: The clamping assembly (2) further comprises two ribs (26), the two ribs (26) being fixedly connected to two sides of the bottom of the driving plate (23), respectively, and the connecting plate (25) being fixedly connected to the two ribs (26).

7. The closed-loop force-controlled dimension measuring device according to claim 6, characterized in that: The rib plate (26) comprises a vertically arranged fixing portion (261) and a connecting portion (262), wherein the fixing portion (261) is fixedly connected to the driving plate (23), and the connecting plate (25) is fixedly connected to the connecting portion (262).

8. The closed-loop force-controlled dimension measuring device according to claim 1, characterized in that: The first measuring plate (21) has a first measuring surface (211), and the second measuring plate (22) has a second measuring surface (221). The first measuring surface (211) and the second measuring surface (221) are arranged opposite to each other, and a soft workpiece to be measured can be clamped between the first measuring surface (211) and the second measuring surface (221).

9. The closed-loop force-controlled dimension measuring device according to any one of claims 1 to 8, characterized in that: The closed-loop force-controlled dimension measuring device further comprises a position limiting assembly (5), wherein the position limiting assembly (5) comprises a photoelectric tube (51) and a sensing sheet (52), wherein the photoelectric tube (51) is mounted on the base (12), and the sensing sheet (52) is mounted on the driving plate (23).

10. The closed-loop force-controlled dimension measuring device according to any one of claims 1 to 8, characterized in that: The distance measuring member (4) is a grating ruler sensor, and the grating ruler sensor is used to measure the distance moved by the driving plate (23).

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