Force standard machine and anti-deflection mechanism of reaction frame of force standard machine

Abstract

The utility model provides a force standard machine and an anti-deflection mechanism of a reaction frame of the force standard machine. An anti-deflection mechanism of a reaction frame comprises two supporting modules, the supporting modules are installed on the upper surface of a movable cross beam of the reaction frame of a force standard machine, and the two supporting modules are close to two stand columns, away from the feeding position of a tested sensor, of a main machine frame of the force standard machine respectively; when a tested sensor is placed on one side of the displacement mechanism, the pushing driving mechanism drives the pushing plate to enable the buffering pad to abut against the stand column, rigid supporting in the horizontal direction is formed, lateral deviation of the reaction frame caused by uneven stress is counteracted, it is ensured that the reaction frame is always kept in the vertical state, the stability of the tested sensor in the feeding and centering displacement process is improved, and the yield of the tested sensor is improved. Therefore, the accuracy of data detection of the force sensor is improved. The buffer pad at the front end of the push plate is made of an elastic material and can absorb tiny vibration of the reaction frame when abutting against the stand column, impact generated by rigid contact is reduced, the surface of the stand column and reaction frame components are protected, and the service life of equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to force standard machine technical field, concretely is force standard machine and anti -force frame's anti -swing mechanism of frame. BACKGROUND

[0002] In the modern industrial detection field, as the core element of accurate measurement of force value, force sensor is widely used in aerospace, automobile manufacturing, material mechanics and other key industries. Its measurement accuracy and reliability directly affect the performance and safety of the whole system, so it is very important to detect the force sensor with high precision. The force sensor is detected by using the force standard machine, which is an important means to ensure that the performance of the force sensor meets the standard. In the detection process, accurately moving and installing the detected force sensor to the center position of the force standard machine counterforce frame is a key step to ensure the accuracy of the detection data.

[0003] The traditional force sensor installation method mainly relies on manual operation or simple auxiliary tools. For small and medium range force sensors, this method can still meet the basic needs. However, with the rapid development of industrial technology, large force value sensors are increasingly widely used in engineering practice. Such sensors usually have large size and weight, and the weight of a single sensor can reach hundreds of kilograms or even several tons. Relying on the traditional installation method not only consumes a lot of manpower and time cost, but also has a high safety risk in the process of carrying and installing, and it is difficult to ensure that the sensor is accurately installed to the center position of the counterforce frame, thereby affecting the detection accuracy.

[0004] To solve the problem of low installation efficiency of large force value sensors, some force standard machines are equipped with automatic displacement mechanisms for the measured sensors. Through automatic control, the mechanism can quickly and accurately move the large force value sensor to the center position of the counterforce frame, significantly improving the installation efficiency and reducing the risk of manual operation. However, due to the special structural design of the counterforce frame, i.e. the top of the counterforce frame is pressed against the force applying mechanism by a spherical pressure head, this structure can adapt to the change of force transmission direction to a certain extent, but when the measured sensor is placed on the automatic displacement mechanism on one side of the counterforce frame, the counterforce frame will be deflected due to uneven force. The deflection of the counterforce frame not only affects the normal operation of the automatic displacement mechanism for the measured sensor, causing its positioning accuracy to decrease, but also seriously threatens the stability of the entire force standard machine system, thereby affecting the accuracy and reliability of the force sensor detection results. In addition, long-term deflection will accelerate the wear of the counterforce frame and related components, increase the maintenance cost and failure probability of the equipment. UTILITY MODEL CONTENTS

[0005] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a force standard machine and an anti-deflection mechanism for the counterforce frame thereof.

[0006] To achieve the above object, the utility model solves its technical problem adopts the technical scheme: a kind of anti-deviation mechanism of counterforce frame, including 2 support modules, the support module is installed on the moving crossbeam upper surface of force standard machine counterforce frame, 2 support modules are respectively close to the 2 vertical columns of force standard machine mainframe far from the feeding position of measured sensor;The support module includes fixed frame, guide rod, push plate, buffer pad and push driving mechanism, the fixed frame includes fixedly connected bottom plate and vertical plate, the vertical plate is vertically arranged with bottom plate, the bottom plate is fixedly installed on the moving crossbeam upper surface, the both ends of the push plate are respectively equipped with one guide rod of horizontal arrangement, the guide rod is movably installed on the vertical plate by guide sleeve, the buffer pad is fixedly installed on the front side of push plate, and the push driving mechanism is used to drive the push plate to move in the direction close to or away from vertical column.

[0007] The utility model through 2 support modules are respectively matched with the 2 vertical columns of mainframe far from feeding position, when measured sensor is placed in displacement mechanism side, push driving mechanism drives push plate to make buffer pad abut against vertical column, forms rigid support in horizontal direction, offsets the lateral deviation of counterforce frame due to uneven stress, ensures that counterforce frame always keeps vertical state, improves the stability in the process of feeding and centering displacement of measured sensor, to improve the accuracy of force sensor detection data.

[0008] Further, the push driving mechanism includes a worm gear reducer, a motor base and a drive motor, the worm gear reducer is fixedly installed on the fixed frame, the output shaft of the worm gear reducer is connected with the push plate, the motor base is also fixedly installed on the worm gear reducer, the drive motor is installed on the motor base, and the output shaft of the drive motor is drivingly connected with the input shaft of the worm gear reducer through a shaft coupling.

[0009] By adopting the above preferred scheme, the push driving mechanism is combined with the worm gear reducer and the drive motor, and the self-locking characteristic of the worm gear is utilized to maintain the fixed supporting force after the buffer pad abuts against the vertical column, thereby preventing the counterforce frame from rebounding.

[0010] Further, the fixed frame is also provided with a rib plate, which is vertically arranged with the bottom plate and the vertical plate.

[0011] By adopting the above preferred scheme, the rib plate is arranged on the fixed frame to enhance the connection strength of the bottom plate and the vertical plate, thereby avoiding the structural deformation caused by long-term push stress.

[0012] Further, the guide rod is provided with a position detection ring, and the bottom plate of the fixing frame is provided with a first position detection sensor and a second position detection sensor which are arranged at intervals along the moving direction of the guide rod; when the position detection ring matches the first position detection sensor, the buffer pad of the support module abuts against the column of the main frame of the force standard machine; when the position detection ring matches the second position detection sensor, the buffer pad of the support module is separated from the column of the main frame of the force standard machine.

[0013] By using the above preferred scheme, the moving distance of the push plate is accurately controlled by the motor, and the automatic identification and positioning of the "abutting against the column" and "separating from the column" states of the buffer pad are realized by combining the position detection ring on the guide rod with the first and second position detection sensors, so as to avoid manual intervention and improve the operation efficiency.

[0014] The force standard machine comprises:

[0015] A main frame comprising a base, a middle platform and a plurality of columns, the columns being vertically fixedly installed on the base, and the middle platform being fixedly installed at the top end of the columns;

[0016] A force applying mechanism installed on the middle platform of the main frame;

[0017] A counterforce frame comprising a top beam, a moving beam and two lead screws, the bottom surface of the top beam being pressed against the force applying mechanism via a spherical pressure head, the lead screws being arranged to extend downward from the top beam, the moving beam being installed on the lead screws, and a driving mechanism for driving the moving beam to move up and down along the lead screws being further installed on the moving beam;

[0018] A sensor automatic displacement mechanism installed on one side of the moving beam, the sensor automatic displacement mechanism being used to move the measured sensor from one side of the main frame to the middle test position of the moving beam;

[0019] The anti-deviation mechanism of the counterforce frame described above is installed on the upper surface of the moving beam.

[0020] The beneficial effects of the above scheme are that the support module and the sensor automatic displacement mechanism work in linkage, the support module automatically extends to abut against the column during the displacement process, and automatically retracts after the detection is completed, without the need for manual adjustment, which is especially suitable for the installation scene of hundreds of kilograms of large force value sensors, avoids the safety hazards caused by traditional manual carrying, eliminates the influence of the deviation of the counterforce frame on the positioning accuracy of the displacement mechanism, and ensures that the sensor accurately falls into the test position.

[0021] Further, the horizontal block on the upper part of the screw rod of the counterforce frame is located above the middle platform, the horizontal block is respectively provided with a top rod extending downward on both sides of the screw rod, and the two top rods on each horizontal block are distributed along the width direction of the top beam; after the pressure of the force applying mechanism is released, the lower end surface of the top rod abuts against the surface of the middle platform; after the counterforce frame is lifted by the pressure of the force applying mechanism, the lower end surface of the top rod is separated from the surface of the middle platform.

[0022] By adopting the preferred scheme, the horizontal block and the top rod provided on the upper part of the screw rod of the counterforce frame automatically abut against the middle platform after the pressure of the force applying mechanism is released, mechanical support is formed, and the counterforce frame is prevented from being suddenly impacted and displaced from the mechanism or the sensor due to gravity; the top rod automatically separates from the middle platform when the force applying mechanism is pressurized, and the normal lifting of the counterforce frame is not affected, the structure not only guarantees the safety of the equipment during shutdown, but also can quickly switch to the detection state, and the working efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0024] Figure 1 is one of the three-dimensional schematic views of one embodiment of the force standard machine.

[0025] Figure 2 is the second three-dimensional schematic view of one embodiment of the force standard machine.

[0026] Figure 3 is a three-dimensional view of one embodiment of the support module.

[0027] Figure 4 is a structural schematic view of another embodiment of the support module.

[0028] Figure 5 is a three-dimensional schematic view of another embodiment of the force standard machine.

[0029] Figure 6 is a three-dimensional schematic view of the fixed frame and the rotating arm assembly in the cantilever lifting mechanism.

[0030] Figure 7 is a structural schematic view of the cantilever lifting mechanism.

[0031] Figure 8 is a sectional view along A-A direction in the figure.

[0032] Names of corresponding components represented by numbers and letters in the figure: Names of corresponding components represented by numbers and letters in the figure:

[0033] 10-Main frame; 11-Base; 12-Middle platform; 13-Column; 20-Force application mechanism; 30-Reaction frame; 31-Top beam; 32-Moving crossbeam; 33-Screw; 40-Automatic sensor shifting mechanism; 60-Support module; 61-Fixed frame; 611-Base plate; 612-Vertical plate; 613-Rib plate; 62-Guide rod; 621-Position detection ring; 63-Push plate; 64-Buffer pad; 65-Pushing drive mechanism; 651-Worm gear reducer ; 652-Motor base; 653-Drive motor; 661-First position detection sensor; 662-Second position detection sensor; 71-Horizontal block; 72-Top rod; 81-Fixed frame; 811-Upper fixed plate; 812-Lower fixed plate; 813-Tie rod; 82-Roller arm assembly; 821-Rolling shaft; 822-Roller drum; 823-Cantilever; 824-Reinforced connecting arm; 825-Bearing; 826-Connecting ring; 827-Guide rail groove; 83-Electric hoist. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] like Figures 1-4 As shown, one embodiment of this utility model is as follows: an anti-sway mechanism for a reaction frame includes two support modules 60. The support modules 60 are installed on the upper surface of the moving crossbeam 32 of the reaction frame 30 of the force standard machine. The two support modules 60 are respectively close to two columns 13 of the main frame of the force standard machine away from the loading position of the sensor being measured. The support module 60 includes a fixed frame 61, a guide rod 62, a push plate 63, a buffer pad 64, and a push-drive mechanism 65. The fixed frame 61 includes a fixedly connected base plate 611 and a vertical plate 612. The vertical plate 612 is perpendicular to the base plate 611. The base plate 611 is fixedly installed on the upper surface of the moving crossbeam 32. A horizontally arranged guide rod 62 is installed at each end of the push plate 63. The guide rod 62 is horizontally movable on the vertical plate 612 via a guide sleeve. The buffer pad 64 is fixedly installed on the front side of the push plate 63. The push-drive mechanism 65 is used to drive the push plate 63 to move towards or away from the column 13.

[0036] The beneficial effects of the above technical scheme are: through cooperation of the two support modules with the two columns of the main rack away from the feeding position, when the measured sensor is placed on one side of the displacement mechanism, the buffer pad is tightly pressed against the column by the push plate driven by the push driving mechanism, forming a rigid support in the horizontal direction, offsetting the lateral deviation of the counterforce frame caused by uneven stress, ensuring that the counterforce frame always maintains a vertical state, improving the stability during the feeding and centering displacement of the measured sensor, and thus improving the accuracy of the force sensor detection data. The buffer pad at the front end of the push plate is made of elastic material, which can absorb the slight vibration of the counterforce frame when it is tightly pressed against the column, reduce the impact caused by rigid contact, protect the surface of the column and the components of the counterforce frame, and prolong the service life of the equipment.

[0037] As shown in Figure 3 In some other embodiments of the present application, the push driving mechanism 65 includes a worm gear reducer 651, a motor base 652 and a driving motor 653. The worm gear reducer 651 is fixedly installed on the fixed frame 61, the output shaft of the worm gear reducer 651 is connected with the push plate 63, the motor base 652 is also fixedly installed on the worm gear reducer 651, the driving motor 653 is installed on the motor base 652, and the output shaft of the driving motor 653 is in transmission connection with the input shaft of the worm gear reducer 651 through a shaft coupling. The beneficial effects of the above technical scheme are: the push driving mechanism is combined with the driving motor by using the self-locking characteristic of the worm gear, which can maintain a fixed supporting force after the buffer pad is tightly pressed against the column, preventing the counterforce frame from rebounding.

[0038] As shown in Figure 3 In some other embodiments of the present application, the fixed frame 61 is also provided with a rib plate 613, which is vertically arranged with the bottom plate 611 and the vertical plate 612. The beneficial effects of the above technical scheme are: the rib plate is arranged on the fixed frame to enhance the connection strength of the bottom plate and the vertical plate, avoiding structural deformation caused by long-term push stress.

[0039] As shown in Figure 4As shown, in some other embodiments of the utility model, position detection ring 621 is arranged on guide rod 62, first position detection sensor 661 and second position detection sensor 662 are arranged on the bottom plate 611 of fixed frame and are spaced apart along the moving direction of guide rod, when position detection ring 621 matches first position detection sensor 661, the buffer pad 64 of support module is abutted on the column 13 of force standard machine mainframe, when position detection ring 621 matches second position detection sensor 662, the buffer pad 64 of support module is separated from the column 13 of force standard machine mainframe. The beneficial effects of the above technical scheme are: the moving distance of push plate is accurately controlled by motor, combined with the position detection ring on guide rod and first and second position detection sensors, the automatic identification and positioning of the state of " abutting column " and " separating column " of buffer pad are realized, manual intervention is avoided, and operation efficiency is improved.

[0040] As Figure 1 and Figure 2 As shown, an embodiment of the utility model is: force standard machine, comprising:

[0041] Mainframe 10, it includes base 11, middle platform 12 and multiple columns 13, column 13 is vertically fixedly installed on base 11, and middle platform 12 is fixedly installed on the top end of column 13;

[0042] Force applying mechanism 20 is installed on the middle platform 12 of mainframe 10;

[0043] Counterforce frame 30, it includes top beam 31, moving crossbeam 32 and 2 lead screws 33, the lower surface of top beam 31 is pressed on force applying mechanism 20 through spherical face pressure head, lead screw 33 is arranged downward from top beam 31, moving crossbeam 32 is installed on lead screw 33, and driving mechanism for driving moving crossbeam 32 to move up and down along lead screw 33 is also installed on moving crossbeam 32;

[0044] Sensor automatic displacement mechanism 40 is installed on one side of moving crossbeam 32, and sensor automatic displacement mechanism 40 is used to move the measured sensor from the side of mainframe 10 to the middle test position of moving crossbeam 32;The specific structure of sensor automatic displacement mechanism 40 is not limited in the application, and can be obtained from prior art, generally, sensor automatic displacement mechanism 40 includes supporting mechanism, lifting mechanism and translation mechanism, supporting mechanism is used to place the sensor to be detected, lifting mechanism is used to drive supporting mechanism to move up and down to ensure that supporting mechanism can avoid the test station pressure table on moving crossbeam when translating, and translation mechanism is used to drive supporting mechanism and lifting mechanism to move to test station;

[0045] The anti-yaw mechanism of the counterforce frame described above is installed on the upper surface of moving crossbeam 32.

[0046] The beneficial effects of the above technical scheme are that the support module and the sensor automatic displacement mechanism work in linkage, the support module automatically extends and abuts against the column during the displacement process, and automatically retracts after the detection is completed, without manual adjustment, especially suitable for installation scenes of hundreds of kilograms of large force value sensors, avoiding safety hazards caused by traditional manual carrying, eliminating the influence of the deflection of the counterforce frame on the positioning accuracy of the displacement mechanism, and ensuring that the sensor accurately falls into the test position.

[0047] As shown in Figure 1 and Figure 2 In some other embodiments of the utility model, horizontal blocks 71 are arranged above the upper part of the screw rod 33 of the counterforce frame and above the middle platform 12, the two sides of the screw rod are respectively provided with top rods 72 extending downward, and the two top rods 72 on each horizontal block 71 are distributed along the width direction of the top beam 31; after the pressure of the force applying mechanism 20 is released, the lower end surface of the top rod 72 abuts against the surface of the middle platform 12; after the counterforce frame 30 is lifted by the pressure of the force applying mechanism 20, the lower end surface of the top rod 72 is separated from the surface of the middle platform 12. The beneficial effects of the above technical scheme are that the horizontal blocks and the top rods arranged at the upper part of the screw rod of the counterforce frame automatically abut against the middle platform after the pressure of the force applying mechanism is released, mechanical support is formed, and the counterforce frame is prevented from suddenly falling and impacting the displacement mechanism or the sensor due to gravity; the top rods automatically separate from the middle platform when the force applying mechanism is pressurized, without affecting the normal lifting of the counterforce frame, the structure not only guarantees the safety of the equipment during shutdown, but also can quickly switch to the detection state, improving the work efficiency.

[0048] As shown in Figures 5-8 In some other embodiments of the utility model, a cantilever lifting mechanism is further included, which includes:

[0049] The fixed frame 81 includes an upper fixed plate 811, a lower fixed plate 812 and a pull rod 813, one end of the upper fixed plate 811 is fixedly installed at the top end of the force standard machine column 13, one end of the lower fixed plate 812 is fixedly installed at the outer periphery of the column 13 below the middle platform 12 of the force standard machine main frame, and the upper and lower ends of the pull rod 813 are connected to the upper fixed plate 811 and the lower fixed plate 812 respectively;

[0050] The rotating arm assembly 82 includes a rotating shaft 821, a rotating cylinder 822, a cantilever 823 and a reinforcing connecting arm 824, the upper end of the rotating shaft 821 is rotatably installed at the other end of the upper fixed plate 811 through a bearing 825, the lower end of the rotating shaft 821 is rotatably installed at the other end of the lower fixed plate 812 through a bearing 825, the upper and lower ends of the rotating cylinder 822 are welded to the upper and lower ends of the rotating shaft 821 through a connecting ring body 826, the rotating cylinder 822 is coaxially arranged with the rotating shaft 821, one end of the cantilever 823 is welded to the lower part of the outer periphery of the rotating cylinder 822, the reinforcing connecting arm 824 is obliquely connected between the rotating cylinder 822 and the cantilever 823, and the cantilever 823 is provided with a horizontally arranged guide groove 827;

[0051] The electric hoist 83, the walking roller of the upper end of which is installed in the guide rail groove 827 of the cantilever, can be obtained from the prior art, and the structure thereof will not be described herein, and the electric hoist is a small-sized lifting device which realizes lifting, lowering and horizontal movement of goods through electric driving.

[0052] The beneficial effect of the above technical solution is that the cantilever hoisting mechanism is directly installed on the force standard machine column, without the need of additionally configuring a plant crane system, and the hoisting function is integrated into the equipment body, thereby solving the problem of relying on external hoisting equipment in the traditional scheme, significantly reducing the requirements for the installation site height, crane track and other infrastructures, and being particularly suitable for small and medium-sized plants or detection environments with limited space. The cantilever can rotate in a large angle range around the column, and the horizontal movement of the electric hoist in the guide rail groove enables the hoisting range to cover the surrounding area of the main frame; the operator can control the electric hoist on the ground to directly hoist the hundreds-of-kilogram-level large force value sensor from the ground to the sensor automatic displacement mechanism on the moving cross beam, thereby avoiding the path limitation of traditional manual carrying.

[0053] In some other embodiments of the present application, the bearing 825 between the upper and lower ends of the rotating shaft 821 and the upper and lower fixed plates 811 and 812 is a tapered roller bearing. The beneficial effect of the above technical solution is that the tapered roller bearing simultaneously bears axial and radial forces, thereby ensuring stable rotation of the rotating arm assembly under heavy load.

[0054] In some other embodiments of the present application, the upper end of the reinforcing connecting arm 824 and the upper part of the rotating drum 822 are connected through welding. The lower end of the reinforcing connecting arm 824 and the upper part of the cantilever 823 are connected through welding. The beneficial effect of the above technical solution is that the reinforcing connecting arm, the rotating drum and the cantilever form a triangular rigid frame through welding, thereby improving the hoisting load capacity.

[0055] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application, and any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. Anti-yaw device for a counterforce frame, characterized in that The support module is installed on the upper surface of the moving crossbeam of the counterforce frame of the force standard machine, and is close to two columns of the main frame of the force standard machine away from the loading position of the measured sensor.

2. The anti-sway mechanism of a reaction frame according to claim 1, characterized in that, The top pushing driving mechanism is used to drive the push plate to move towards the column or away from the column.

3. The anti-sway mechanism of a reaction frame according to claim 1, characterized in that, The top pushing driving mechanism comprises a worm gear reducer, a motor base and a driving motor.

4. The anti-sway mechanism of the counterforce frame according to claim 1, characterized in that, The worm gear reducer is fixedly installed on the fixed frame, and the output shaft of the worm gear reducer is connected with the push plate.

5. Force standard machine, characterized in that, The fixed frame is further provided with a rib plate which is vertically arranged with the bottom plate and the vertical plate. The position detection ring is arranged on the guide rod, and the first position detection sensor and the second position detection sensor are arranged on the bottom plate of the fixed frame and are spaced apart along the moving direction of the guide rod. The main frame comprises a base, a middle platform and a plurality of columns, the columns are vertically fixedly installed on the base, and the middle platform is fixedly installed on the top end of the columns. The force applying mechanism is installed on the middle platform of the main frame. The counterforce frame comprises a top beam, a moving crossbeam and two lead screws, the lower surface of the top beam is pressed against the force applying mechanism through a spherical pressure head, the lead screws are arranged downward from the top beam, the moving crossbeam is installed on the lead screws, and a driving mechanism for driving the moving crossbeam to move up and down along the lead screws is further installed on the moving crossbeam. The sensor automatic displacement mechanism is installed on one side of the moving crossbeam, and is used to move the measured sensor from one side of the main frame to the middle test position of the moving crossbeam.

6. Force standard machine according to claim 5, characterized in that The anti-deviation mechanism of the counterforce frame is installed on the upper surface of the moving crossbeam. The upper part of the lead screw of the counterforce frame is located above the middle platform and is provided with a horizontal block, the horizontal block is provided with a top rod which extends downward on each side of the lead screw, and the two top rods on each horizontal block are distributed along the width direction of the top beam. After the force applying mechanism is unloaded, the lower end surface of the top rod abuts against the surface of the middle platform. After the force applying mechanism lifts the counterforce frame, the lower end surface of the top rod is separated from the surface of the middle platform.

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