High-precision force measuring mechanism for flexible lever heavy punch support

Abstract

The invention relates to a high-precision force measuring mechanism for a flexible lever heavy hammer support, and the mechanism comprises a first installation seat, a first fixed plate, a second installation seat, a second fixed plate, a positioning structure, and a sensor tool. The rectangular end surfaces of the first mounting seat and the second mounting seat in the height direction are oppositely mounted at intervals, and are connected and fixed through the first fixing plate and the second fixing plate; the positioning structure is used for realizing coarse positioning and fine positioning of the to-be-tested flexible lever heavy punch supporting assembly; the sensor tool is installed on the rectangular end face of the first installation base and used for positioning the force measuring zero point of the flexible lever heavy punch supporting assembly and measuring the supporting force, the working direction of the flexible lever heavy punch supporting assembly is accurately determined through multiple positioning modes, and the force measuring precision is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of high-precision flexible supports, and in particular relates to a high-precision force measuring mechanism for flexible lever weight supports. Background Art

[0002] High-quality optical imaging is inseparable from the high-precision surface shape of the optical mirror. In the field of optical imaging, there are many factors that affect the surface shape accuracy of the mirror, such as optical processing, optical coating, ambient temperature changes, optical support, etc. Among them, optical support is the most difficult variable to accurately control. The quality of optical support will directly affect the surface shape accuracy of the mirror. Optical support often uses flexible support to compensate for optical misalignment caused by support mechanical processing accuracy, mechanical assembly accuracy, optical adjustment accuracy, and temperature changes, to avoid hard impact on optical components caused by rigid support. At the same time, flexible support also has a certain buffering and vibration absorption effect, which greatly protects the impact resistance of brittle optical components.

[0003] There are many forms of flexible supports for optical mirrors, such as bipod flexible support, mechanical floating support (Whiffle tree), lever weight support, mercury belt support, flexible steel belt side support, etc. For the flexible lever weight support structure, it is mainly composed of flexible connecting rod, weight lead block, weight connecting rod, rotating pin, support seat, connecting ball head, etc. The weight of the weight itself is used to balance the gravity of the optical element or part of the gravity. The flexible connecting rod is mainly used to unload the thermal stress caused by the mismatch of thermal expansion coefficients between optical elements and mechanical metal elements when the temperature changes. At the same time, it also has a certain unloading effect on the stress caused by processing and assembly errors. The stiffness of this structure in the normal working direction is very high, which is the main direction of providing supporting force. In addition, the optical surface accuracy is relatively high, and the changes are at the nanometer scale. Therefore, it is also relatively sensitive to the supporting force, and there are high requirements for the accuracy of the supporting force. However, the supporting force provided by the heavy hammer with a flexible structure is difficult to measure accurately. When supporting force measurement during the installation and adjustment stage, the eccentricity and angle deviation of the flexible connecting rod will cause elastic deformation of the flexible connecting rod in the non-working direction, resulting in inaccurate force measurement, making it difficult to match the supporting force provided by the heavy hammer with the theoretical value during the installation and adjustment stage.

[0004] The traditional lever-weight support does not have a flexible structure, and the lever connecting rod is a rigid structure. The structure is easy to level and force measurement is relatively easy. There are few reports on force measurement schemes for weight lever supports with flexible structures. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a high-precision force measuring mechanism for a flexible lever and weight support. The mechanism is fixed on a high-precision standard optical platform, and the benchmark of the flexible lever and weight support assembly to be measured is found through a variety of positioning methods. The supporting force provided by the weight is accurately measured by relying on the mechanism's own stiffness and connection stiffness.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A high-precision force measuring mechanism for a flexible lever weight support comprises: an end face positioning block, a U-shaped positioning block, an L-shaped positioning block, a first mounting seat, a second mounting seat, a translation block, a translation top screw, a sensor mounting seat, a force sensor, an adapter block, a force measuring block, a first fixing plate, and a second fixing plate.

[0008] The first mounting seat and the second mounting seat both adopt a high-rigidity right-angle trapezoidal structure, and the two are installed at a relative interval. The central interval area is used to install and fix the flexible lever weight support assembly to be tested, the positioning structure (L-shaped positioning block, end face positioning block, U-shaped positioning block), and the sensor tooling (force measuring block, adapter block, force sensor, sensor mounting seat);

[0009] The component to be measured is installed on the second mounting seat; the L-shaped positioning block is jointly installed on the end face positioning block and the U-shaped positioning block on the first mounting seat to accurately locate the working direction of the component to be measured; the force measuring block, the adapter block, the force sensor, and the sensor mounting seat constitute the sensor tooling and are installed in the vertical slide groove of the first mounting seat through the sensor mounting seat, and move up and down as a whole, and the force measurement zero point is accurately located through the force sensor reading, and finally the first mounting seat and the second mounting seat are connected and fixed by the first fixing plate and the second fixing plate, so as to improve the overall connection stiffness of the force measuring mechanism.

[0010] The second mounting seat is fixed on a high-precision standard optical platform with screws. The flexible lever and weight support assembly to be tested is fixedly connected to the mounting hole of the second mounting seat through the support seat. The bottom surface of the L-shaped positioning block is leveled with the bottom surfaces of the first mounting seat and the second mounting seat through the optical platform. The support seat of the flexible lever and weight support to be tested is rotated at a small angle so that the side surface of the L-shaped positioning block is completely fitted with the side end surface of the weight support seat, thereby making the center of the flexible connecting rod of the flexible lever and weight support assembly to be tested coincide with the vertical surface (XZ surface) of the first mounting seat.

[0011] The end face of the first mounting seat has a sliding groove that can be gap-matched with the end face positioning block, and the two are fixedly connected by screws. The first mounting seat is translated so that the end face of the end face positioning block and the end face of the flexible connecting rod are slightly close to each other, and the first mounting seat is preliminarily connected to the optical platform, and the screws are pre-tightened.

[0012] The translation block is fixedly connected to the optical platform, and translation top screws are installed on both sides of the translation block. The translation top screws are connected to the translation block through threads, and the end faces of the top screws are in contact with the first mounting seat. The first mounting seat is pushed forward and translated by rotating the translation top screws, so that the end face positioning block is close to the end face of the flexible connecting rod of the flexible lever and weight support assembly to be tested, and the two end faces are tightly fitted without any gap. The first mounting seat is fixedly connected to the optical platform with screws. At this time, the center of the flexible connecting rod of the flexible lever and weight support assembly to be tested is roughly leveled with the vertical end face (YZ face) of the first mounting seat.

[0013] One side of the horizontal slide groove of the end surface positioning block on the first mounting seat is an open structure. After the first mounting seat is fixed, the end surface positioning block is pulled out from the horizontal slide groove of the first mounting seat;

[0014] The sensor tooling is mainly composed of a high-precision force sensor, a sensor mounting seat, an adapter block, and a force measuring block. The sensor is installed on the sensor mounting seat, and the adapter block and the force measuring block are installed below the force sensor in sequence;

[0015] Further, the sensor fixture can be installed in the vertical slide groove on the first mounting seat through the force sensor, so that the sensor fixture can be moved up and down to adjust the initial position of the force measurement;

[0016] Furthermore, the force measuring block is an annular structure, which can measure both tension and pressure. The flexible lever weight support assembly to be measured is installed in the upper mounting hole of the second mounting seat, and the sensor tooling is installed in the vertical slide groove below the first mounting seat. The force measuring mechanism can be compatible with the measurement of push and pull forces.

[0017] Further, the U-shaped positioning block is installed on the first mounting seat through the stopper, and the dimension chain is transferred through mechanical processing to ensure that the inner surface of the U-shaped positioning block is perpendicular to the bottom surface of the first mounting seat;

[0018] Further, the weight connecting rod of the flexible lever weight supporting assembly to be tested is adjusted (the weight lead block is not installed) so that the flexible connecting rod linked by the rotating pin fits the inner surface of the U-shaped positioning block. At this time, the center of the flexible connecting rod is precisely leveled with the vertical end surface (YZ surface) of the first mounting seat, and the plumb direction of the flexible connecting rod, that is, the working direction, is found.

[0019] Furthermore, the sensor fixture is adjusted up and down at this time. When the force measuring block just contacts the ball head of the weight to be measured and the reading of the high-precision force sensor is within the range of 0~0.1N, the force measurement zero point is determined, the sensor fixture is fixed, and the U-shaped positioning block is removed;

[0020] Further, the first fixing plate and the second fixing plate above the connecting mechanism are connected to improve the connection rigidity of the mechanism, and the installation of the force measuring mechanism is now completed, and the force measuring mechanism is now installed in place as a whole;

[0021] Further, install the heavy lead block, move the position of the heavy lead block forward and backward, so that the force measured by the force sensor is within ±1N of the theoretical force, and tighten the lead block locking nut to complete the force measurement.

[0022] The beneficial effects of the present invention are:

[0023] The high-precision force measuring mechanism for the flexible lever and weight support of the present invention uses a variety of positioning methods to accurately determine the working direction of the flexible lever and weight support; through the high rigidity of the tooling itself and the high rigidity of the connections between the components, the additional torque caused by the deformation of the flexible support in the non-working direction is further reduced, thereby improving the force measurement accuracy, so that the force measurement accuracy can reach within ±1N. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A force measuring principle diagram of a high-precision force measuring mechanism for a flexible lever weight support according to the present invention;

[0025] Figure 2 It is a front cross-sectional view of a high-precision force measuring mechanism for flexible lever weight support of the present invention;

[0026] Figure 3 A top view of a high-precision force measuring mechanism for flexible lever weight support according to the present invention;

[0027] Figure 4 It is a side cross-sectional view of a high-precision force measuring mechanism for flexible lever weight support of the present invention;

[0028] Figure 5 The invention discloses an oblique isometric view of a high-precision force measuring mechanism for a flexible lever-weight support.

[0029] Reference numerals:

[0030] 1-translation block; 2-first mounting seat; 3-end face positioning block; 4-U-shaped positioning block; 5-force measuring block; 6-adapter block; 7-force sensor; 8-sensor mounting seat; 9-first fixed plate; 10-second mounting seat; 11-L-shaped positioning block; 12-support assembly of flexible lever weight to be tested; 12-1-weight lead block; 12-2-weight connecting rod; 12-3-support seat; 12-4-rotating pin; 12-5-flexible connecting rod; 12-6-connecting ball head; 13-translation top screw; 14-second fixed plate. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] like Figure 1The force measuring principle diagram of a high-precision force measuring mechanism for a flexible lever weight support of the present invention is shown. The force measuring mechanism controls the supporting force provided by the flexible lever weight support assembly 12 (weight lead block 12-1, weight connecting rod 12-2, support seat 12-3, rotating pin 12-4, flexible connecting rod 12-5, connecting ball head 12-6) to be tested with high precision. When the center of the flexible connecting rod 12-5 of the flexible lever weight support assembly 12 to be tested coincides with the direction of the plumb bob, it is the working direction of the flexible connecting rod 12-5, and the working direction has high stiffness. At this time, the supporting force F1 provided by the connecting ball head 12-6 can be accurately measured; but when the installation positioning error causes the center of the flexible connecting rod 12-5 to not coincide with the direction of the plumb bob, the two mutually orthogonal flexible spring pieces of the flexible connecting rod 12-5 will undergo elastic deformation. At this time, the measured supporting force F2 is not only provided by the weight lead block, but also the elastic torque generated by its elastic deformation in the non-working direction is superimposed on the supporting force, resulting in inaccurate force measurement; therefore, a force measuring mechanism is required to accurately find the working direction of the flexible connecting rod 12-5.

[0033] like Figure 2 The main cross-sectional view of a high-precision force measuring mechanism supported by a flexible lever weight of the present invention is shown, comprising: a translation block 1, a first mounting seat 2, an end face positioning block 3, a U-shaped positioning block 4, a force measuring block 5, an adapter block 6, a force sensor 7, a sensor mounting seat 8, a first fixed plate 9, a second mounting seat 10, an L-shaped positioning block 11, a translation top screw 13, and a second fixed plate 14. The force measuring mechanism composed of the above components is installed as a whole on a high-precision standard optical platform.

[0034] refer to Figure 3 , Figure 4 , Figure 5 , the first mounting seat 2 and the second mounting seat 10 both adopt a high-rigidity right-angle trapezoidal structure, and the rectangular end faces of the two are installed at relative intervals in the height direction. The first mounting seat 2 and the second mounting seat 10 are connected and fixed by the first fixing plate 9 and the second fixing plate 14 to improve the overall connection rigidity of the force measuring mechanism. The central spacing area is used to install and fix the flexible lever weight support assembly 12 to be tested, the positioning structure (L-shaped positioning block 11, end face positioning block 3, U-shaped positioning block 4), and the sensor tooling (force measuring block 5, adapter block 6, force sensor 7, sensor mounting seat 8). Specifically, the flexible lever weight support assembly 12 to be tested is installed on the lower mounting hole of the second mounting seat 10; the L-shaped positioning block 11 is installed in the working direction of the flexible lever weight support assembly 12 to be tested, and the working direction is jointly determined by the end face positioning block 3 and the U-shaped positioning block 4 installed on the first mounting seat 2, and the U-shaped positioning block 4 is connected across the two sides of the rectangular end face of the first mounting seat 2; the rectangular end face of the first mounting seat 2 includes a vertical slide groove and a horizontal slide groove, such as Figure 5As shown, the end face positioning block 3 can slide freely in the horizontal slide groove of the first mounting seat 2, and the front and rear position of the first mounting seat 2 can be adjusted so that the end face of the end face positioning block 3 is slightly close to the end face of the flexible connecting rod 12-5 of the flexible lever and weight support assembly 12 to be tested; the force measuring block 5, the adapter block 6, the force sensor 7, and the sensor mounting seat 8 constitute a sensor tooling, wherein the force sensor 7 is installed on the sensor mounting seat 8, and the adapter block 6 and the force measuring block 5 are installed in sequence below the force sensor 7, and the force measuring block 5 can contact with the flexible lever and weight support assembly 12 to be tested, and the sensor mounting seat 8 is installed in the vertical slide groove of the first mounting seat 2, so that the force measuring sensor tooling moves up and down as a whole, and the force measuring zero point is accurately found through the reading of the force sensor 7.

[0035] refer to Figure 4 The first mounting seat 2 and the second mounting seat 10 are fixed on a high-precision standard optical platform with screws. The support seat 12-3 of the flexible lever weight support assembly 12 to be tested is fixedly connected to the mounting hole below the second mounting seat 10. The bottom surface of the L-shaped positioning block 11 is completely leveled with the bottom surfaces of the first mounting seat 2 and the second mounting seat 10 through the optical platform surface. The support seat 12-3 of the flexible lever weight support assembly 12 to be tested is rotated at a small angle so that the side surface of the L-shaped positioning block 11 is completely fitted with the side end surface of the support seat 12-3 of the flexible lever weight support assembly 12 to be tested, so that the center of the flexible connecting rod 12-5 coincides with the vertical surface (XZ surface) of the first mounting seat 2.

[0036] refer to Figure 2-Figure 3 The translation block 1 is fixedly connected to the optical platform, and translation top screws 13 are installed on both sides of the translation block 1. The translation top screws 13 are connected to the translation block 1 through threads. The end face of the translation top screw 13 contacts the first mounting seat 2. The first mounting seat 2 is pushed forward by rotating the translation top screw 13, so that the end face positioning block 3 is close to the end face of the flexible connecting rod 12-5 of the flexible lever and weight support assembly 12 to be tested, and the two end faces are tightly fitted without any gap. At this time, the center of the flexible connecting rod 12-5 of the flexible lever and weight support assembly 12 to be tested is roughly leveled with the vertical end face (YZ face) of the first mounting seat.

[0037] Figure 5 The end surface of the horizontal slide groove where the end surface positioning block 3 of the first mounting seat 2 is located is an open structure. After the first mounting seat 2 is fixed, the end surface positioning block 3 is pulled out from the horizontal slide groove of the first mounting seat 2;

[0038] Further, the sensor fixture is installed in the vertical slide groove of the first mounting seat 2 through the sensor mounting seat 8, so that the sensor fixture can be moved up and down as a whole to adjust the initial position of the force measurement;

[0039] Furthermore, the force measuring block 5 is a ring structure, which can measure both tension and pressure; the flexible lever and weight support assembly 12 to be measured is installed in the upper mounting hole of the second mounting seat 10, and the sensor tooling is installed in the vertical slide groove below the first mounting seat 2. The force measuring mechanism is compatible with the measurement of push and pull forces, and can also be compatible with the force measurement of support assemblies with flexible connecting rods of different lengths, and can be used not only for lever and weight supports with flexible structures, but also for force measurement of lever and weight supports without flexible structures.

[0040] Further, the U-shaped positioning block 4 is installed on the first mounting seat 2 through the stopper, and the inner surface of the U-shaped positioning block 4 is perpendicular to the bottom surface of the first mounting seat 2 by mechanical processing and transferring the dimension chain;

[0041] Further, the weight connecting rod 12-2 (the weight lead block 12-1 is not installed) of the flexible lever weight supporting assembly 12 to be tested is adjusted so that the flexible connecting rod 12-5 linked by the rotating pin 12-4 of the flexible lever weight supporting assembly 12 to be tested fits the inner surface of the U-shaped positioning block 4. At this time, the center of the flexible connecting rod 12-5 is precisely leveled with the vertical end surface (YZ surface) of the first mounting seat 2, and the plumb direction of the flexible connecting rod 12-5, that is, the working direction, is found;

[0042] Further, at this time, the sensor fixture is adjusted up and down, when the force measuring block 5 just contacts the ball head 12-6 of the weight to be measured, and the reading of the high-precision force sensor 7 is within the range of 0~0.1N, the force measurement zero point is determined, the sensor fixture is fixed, and the U-shaped positioning block 4 is removed;

[0043] like Figure 3 The first fixing plate 9 and the second fixing plate 14 above the connecting mechanism are shown to improve the connection rigidity of the mechanism. At this time, the overall installation of the force measuring mechanism is completed;

[0044] Further, install the weight lead block 12-1 of the flexible lever weight support assembly 12 to be tested, move the position of the weight lead block 12-1 forward and backward, so that the force measured by the high-precision force sensor 7 is within ±1N of the theoretical force, and tighten the locking nut of the weight lead block 12-1, and the force measurement is completed.

[0045] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-precision force measuring mechanism for flexible lever weight support, characterized in that: It includes a first mounting seat, a first fixing plate, a second mounting seat, a second fixing plate, a positioning structure, and a sensor tooling; Wherein, the first mounting seat and the second mounting seat are both of right-angled trapezoidal structure, and the first mounting seat and the second mounting seat are installed with rectangular end faces in the height direction being spaced relative to each other, and are connected and fixed by the first fixing plate and the second fixing plate; The positioning structure is used to achieve rough positioning and fine positioning of the flexible lever weight support assembly to be tested; The sensor tooling is installed on the rectangular end surface of the first mounting seat, and is used to locate the force measurement zero point of the flexible lever weight support assembly and measure the supporting force provided by the flexible lever weight support assembly.

2. A high-precision force measuring mechanism for flexible lever weight support according to claim 1, characterized in that: The rectangular end surface of the first mounting seat includes a vertical slide groove and a horizontal slide groove.

3. A high-precision force measuring mechanism for flexible lever weight support according to claim 2, characterized in that: The positioning structure includes an L-shaped positioning block, an end surface positioning block, and a U-shaped positioning block, wherein: The bottom surface of the L-shaped positioning block is leveled with the bottom surfaces of the first mounting seat and the second mounting seat, and the side surface is completely in contact with the side end surface of the support seat of the flexible lever and weight support assembly to be tested, so as to locate the rotational freedom of the flexible lever and weight support assembly to be tested; The end surface positioning block is located in a horizontal slide groove of a rectangular end surface of the first mounting seat, and is used to roughly determine the vertical direction of the flexible connecting rod in the flexible lever weight support assembly to be tested; The U-shaped positioning block is connected across the two sides of the rectangular end surface of the first mounting seat, and is used to accurately determine the vertical direction of the flexible connecting rod in the flexible lever weight support assembly to be tested.

4. A high-precision force measuring mechanism for flexible lever weight support according to claim 2, characterized in that: The side end of the horizontal slide groove of the rectangular end face of the first mounting seat is an open structure, and the positioning block is pulled out of the horizontal slide groove after positioning is completed; the U-shaped positioning block and the L-shaped positioning block are detachably installed.

5. A high-precision force measuring mechanism for flexible lever weight support according to claim 1, characterized in that: The sensor tooling includes a force measuring block, an adapter block, a force sensor, and a sensor mounting seat. The force sensor is installed on the sensor mounting seat. The adapter block and the force measuring block are installed in sequence below the force sensor. The force measuring block can contact the flexible lever weight support assembly to be tested.

6. A high-precision force measuring mechanism for flexible lever weight support according to claim 5, characterized in that: The sensor mounting seat is installed in the vertical slide groove of the first mounting seat, so that the sensor tooling moves up and down as a whole, and the force measurement zero point is accurately found through the force sensor reading and the supporting force provided by the flexible lever weight support assembly is measured.

7. A high-precision force measuring mechanism for flexible lever weight support according to claim 1, characterized in that: The force measuring mechanism also includes a translation block and a translation top screw. The translation block is fixedly connected to the optical platform. Translation top screws are installed on both sides of the translation block. The end faces of the translation top screws are in contact with the first mounting seat. The first mounting seat is driven to translate forward by rotating the translation top screw, so that the end face positioning block is close to the end face of the flexible connecting rod of the flexible lever weight support assembly to be measured.

8. A high-precision force measuring mechanism for flexible lever weight support according to claim 1, characterized in that: The force measuring mechanism is compatible with the measurement of push-pull forces, the force measurement of support assemblies with flexible connecting rods of different lengths, and the support force measurement of lever-weight support assemblies without flexible mechanisms.

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