阅读说明：本技术 一种离心机转臂静态称重装置 (Centrifuge rotating arm static weighing device ) 是由 陈磊 蒋春梅 洪建忠 成永博 张建全 赵世鹏 于 2020-06-05 设计创作，主要内容包括：本发明涉及离心机技术领域,具体公开了一种离心机转臂静态称重装置,包括转臂和转臂支撑,所述的转臂中部套设在转臂支撑内,所述的转臂的底部设置有安装槽,所述的安装槽的顶部固定设置有上顶块,所述的安装槽下方的转臂支撑上设置有安装孔,所述的安装孔内设置有静态称重装置,所述静态称重装置的顶部抵在上顶块的底部,并支撑转臂使其底部不与转臂支撑接触。本发明的优点是通过配置在支撑点的四支称重传感器,精确测量转臂的重量,通过计算得出转臂的质心位置,最终通过重量配比或者配平机构令左右两侧数据完全相等,实现转臂在静态下的精确配平。(The invention relates to the technical field of centrifuges, and particularly discloses a rotating arm static weighing device of a centrifuge, which comprises a rotating arm and a rotating arm support, wherein the middle part of the rotating arm is sleeved in the rotating arm support, the bottom of the rotating arm is provided with a mounting groove, the top of the mounting groove is fixedly provided with an upper ejector block, the rotating arm support below the mounting groove is provided with a mounting hole, a static weighing device is arranged in the mounting hole, the top of the static weighing device is abutted against the bottom of the upper ejector block, and the rotating arm is supported so that the bottom of the static weighing device is not contacted with the rotating arm support. The invention has the advantages that the weight of the rotating arm is accurately measured by the four weighing sensors arranged at the supporting points, the position of the mass center of the rotating arm is obtained by calculation, and finally, the data on the left side and the right side are completely equal by the weight proportion or the balancing mechanism, so that the accurate balancing of the rotating arm under the static state is realized.)

1. The utility model provides a centrifuge rocking arm static weighing device which characterized in that: including rocking arm (2) and rocking arm support (1), rocking arm (2) middle part cover establish in rocking arm support (1), the bottom of rocking arm (2) be provided with mounting groove (5), the fixed kicking block (4) of being provided with in top of mounting groove (5), rocking arm support (1) of mounting groove (5) below on be provided with the mounting hole, the mounting hole in be provided with static weighing device (3), the top of static weighing device (3) supports the bottom at last kicking block (4) to support rocking arm (1) and make its bottom not support (1) contact with the rocking arm.

2. A centrifuge rotor arm static weighing apparatus as defined in claim 1 wherein: the static weighing device (3) comprises a bearing screw (6), the bearing screw (6) is arranged in the mounting hole, one end of the bearing screw penetrates through the mounting hole to extend out of the bottom of the rotating arm support (1), a bearing nut (7) is connected to the bottom of the bearing screw (6) in a threaded mode, the bearing screw (6) is arranged in a hollow mode, a tray (8) is arranged in the bearing screw in a sliding mode, a weighing sensor (10) is arranged between the tray (8) and the upper ejector block (4), and a thrust ball bearing (11) is arranged between the bottom of the tray (8) and the bearing nut (7).

3. A centrifuge rotor arm static weighing apparatus as defined in claim 2 wherein: the top of tray (8) be provided with down kicking block (9), the bottom of weighing sensor (10) place on kicking block (9) down.

4. A centrifuge rotor arm static weighing apparatus as defined in claim 3 wherein: the bottom of weighing sensor (10) be provided with shelves pole (12), the top of lower kicking block (9) vertically be provided with one and only rotate pin (13) for with shelves pole (12) cooperation restriction weighing sensor (10) rotate.

5. A centrifuge rotor arm static weighing apparatus as defined in claim 3 wherein: the bottom of the upper ejector block (4) and the top of the lower ejector block (9) are both provided with supporting grooves, and the top and the bottom of the weighing sensor (10) are respectively arranged in the supporting grooves of the upper ejector block (4) and the lower ejector block (9).

6. A centrifuge rotor arm static weighing apparatus as defined in claim 5 wherein: the top and the bottom of the weighing sensor (10) are arranged to be spherical structures.

7. A centrifuge rotor arm static weighing apparatus as defined in claim 2 wherein: the outer part of the upper end of the bearing screw rod (6) is provided with a connecting flange, the mounting hole is a counter bore, and the connecting flange on the bearing screw rod (6) is arranged in the counter bore and is connected with the rotating arm support (1) through a bolt.

8. A centrifuge rotor arm static weighing apparatus as defined in claim 1 wherein: the number of the static weighing devices (3) is four, and the four static weighing devices are arranged in bilateral symmetry with respect to the center of the rotating arm support (1).

9. A centrifuge rotor arm static weighing apparatus as defined in claim 1 wherein: gaps are arranged between the rotating arm (2) and the rotating arm support (1) in all directions.

Technical Field

The invention relates to the technical field of centrifuges, in particular to a rotating arm static weighing device of a centrifuge.

Background

All rotating machines should be balanced as much as possible, and unbalanced force causes dynamic load in the operation process of the centrifuge so as to cause equipment vibration, thereby causing the reduction of the operation stability and precision of a system, the increase of motion noise, accelerated wear of moving parts, abnormal operation of a rotor, shortened service life, even overturn of a main machine and the like, and affecting the operation safety of the whole centrifuge.

At present, most of domestic centrifugal machine balancing adopts a method of 'theoretical balancing' or 'trial running balancing'. The theory balancing uses moment balance as principle, or a balancing weight with certain mass is placed in a hanging basket at the balancing weight side, or a balancing mechanism is used for realizing the balancing of the rotating arm. But due to human factors, it is easy to cause failure of the trimming due to errors. The 'trial running balancing' is further more advanced than the 'theoretical balancing', and the centrifuge with the 'trial running balancing' capability is provided with a force measuring assembly between the rotating arm and the rotating arm support, so that the real-time monitoring can be carried out when the centrifuge runs. Therefore, after the theoretical balancing and before the formal test, the effect of the theoretical balancing can be detected through the trial operation of low rotating speed. When the 'theoretical balancing' is found to fail, the machine can only be stopped for balancing again and then the machine is tried to operate. After repeated times, the balance of the rotating arm can be ensured.

The defects of the traditional technology are as follows: "theoretical trim" is prone to trim failure due to the possibility of miscalculation.

The trial operation balancing needs to be performed for several times before the test, so that the rotating arm can be balanced, and the efficiency is low.

The reasons for the above disadvantages are: the force measuring assembly can only monitor the unbalanced force during operation, and can not carry out static weighing and then carry out static balancing.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a centrifuge rotating arm static weighing device, aiming at the problem that the traditional theoretical balancing or trial operation balancing method cannot realize the measurement of the balance state of a centrifuge rotating arm in a static state, the patent technology aims to realize the measurement of the static balance state of a centrifuge so as to guide the static balancing of the centrifuge, thereby improving the operation efficiency.

The purpose of the invention is realized by the following technical scheme: the utility model provides a centrifuge rocking arm static weighing device, supports including rocking arm and rocking arm, rocking arm middle part cover establish in the rocking arm supports, the bottom of rocking arm be provided with the mounting groove, the fixed kicking block that is provided with in top of mounting groove, the rocking arm of mounting groove below support and be provided with the mounting hole, the mounting hole in be provided with static weighing device, static weighing device's top is supported to the bottom at last kicking block to support the rocking arm and make its bottom not support the contact with the rocking arm.

Specifically, the static weighing device comprises a bearing screw rod, the bearing screw rod is arranged in the mounting hole, one end of the bearing screw rod penetrates through the mounting hole and extends out of the bottom of the rotating arm support, a bearing nut is connected to the bottom of the bearing screw rod in a threaded mode, the bearing screw rod is arranged in a hollow mode, a tray is arranged inside the bearing screw rod in a sliding mode, a weighing sensor is arranged between the tray and the upper ejector block, and a thrust ball bearing is arranged between the bottom of the tray and the bearing nut.

Specifically, the top of tray be provided with down the kicking block, weighing sensor's bottom place under on the kicking block.

Specifically, the bottom of the weighing sensor is provided with a stop lever, and the top of the lower ejector block is vertically provided with a rotation stopping pin used for being matched with the stop lever to limit the rotation of the weighing sensor.

Specifically, the bottom of the upper ejector block and the top of the lower ejector block are both provided with a supporting groove, and the top and the bottom of the weighing sensor are respectively arranged in the supporting grooves of the upper ejector block and the lower ejector block.

Specifically, the top and the bottom of the weighing sensor are arranged to be spherical structures.

Specifically, the connecting flange is arranged outside the upper end of the bearing screw rod, the mounting hole is a counter bore, and the connecting flange on the bearing screw rod is arranged in the counter bore and is in supporting connection with the rotating arm through a bolt.

Specifically, the number of the static weighing devices is four, and the four static weighing devices are arranged symmetrically left and right about the center of the rotating arm support.

Specifically, gaps exist between the rotating arm and the rotating arm support in all directions

The invention has the following advantages: according to the invention, the weight of the rotating arm is accurately measured by the four-branch weighing sensor arranged at the supporting point, the position of the mass center of the rotating arm is obtained by calculation, and finally, the data on the left side and the data on the right side are completely equal by a weight ratio or a balancing mechanism, so that the accurate balancing of the rotating arm in a static state is realized.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a static weighing apparatus according to the present invention;

in the figure: 1-rotating arm support, 2-rotating arm, 3-static weighing device, 4-upper top block, 5-mounting groove, 6-bearing screw rod, 7-bearing nut, 8-tray, 9-lower top block, 10-weighing sensor, 11-thrust ball bearing, 12-stop rod, 13-rotation-stopping pin and 14-force measuring component.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following.

As shown in fig. 1-2, a centrifuge rotating arm static weighing device comprises a rotating arm 2 and a rotating arm support 1, wherein the middle part of the rotating arm 2 is sleeved in the rotating arm support 1, a mounting groove 5 is arranged at the bottom of the rotating arm 2, a top block 4 is fixedly arranged at the top of the mounting groove 5, the top block 4 is fixed on the rotating arm 2 through a bolt, a mounting hole is formed in the rotating arm support 1 below the mounting groove 5, a static weighing device 3 is arranged in the mounting hole, the top of the static weighing device 3 is supported at the bottom of the top block 4, the rotating arm 1 is supported so that the bottom of the rotating arm 1 is not contacted with the rotating arm support 1, four static weighing devices 3 are arranged in a manner of bilateral symmetry about the center of the rotating arm support 1, and four corresponding mounting grooves 5 and four mounting holes. When the scheme is used, the rotating arm 2 is supported on the rotating arm support 1 through the static weighing device 3, the supporting force of the rotating arm is detected, the number of the static weighing devices 3 is four, the number of the rotating arm 2 is two, and the sum of the supporting forces measured by the two sensors on the left side is the supporting force F of the left fulcrum₁The sum of the supporting forces measured by the two right sensors is the supporting force F of the right fulcrum₂Then the position e of the mass center is calculated according to the moment balance principle, and finally, a mass center is arranged at the corresponding position of the rotating arm 2The balancing weight m with fixed mass or a balancing mechanism is used for making F1 and F2 completely equal, and finally rotating arm balancing is realized; in the scheme, the arrangement distance of the four static weighing devices 3 is as large as possible, and the mass center is enabled to fall into four supporting points so as to avoid side turning; meanwhile, a certain gap is reserved in each direction between the rotating arm 2 and the rotating arm support 1 so as not to bear the force of a structural member, and the value measured by the weighing sensor 10 is not the real weight of the rotating arm 2.

As shown in fig. 2, the static weighing device 3 includes a force-bearing screw 6, the force-bearing screw 6 is disposed in the mounting hole, one end of the force-bearing screw 6 passes through the mounting hole and extends out of the bottom of the rotating arm support 1, the bottom of the force-bearing screw 6 is connected with a force-bearing nut 7 through a thread, the force-bearing screw 6 is hollow, a tray 8 is slidably disposed in the force-bearing screw 6, a weighing sensor 10 is disposed between the tray 8 and the upper top block 4, and a thrust ball bearing 11 is disposed between the bottom of the tray 8 and the force-bearing nut 7. In the scheme, the inner cavity part of a bearing nut 7 is a threaded hole, a thrust ball bearing 11 is arranged in the bearing nut 7, a tray 8 is rotatably connected with the bearing nut 7 through the thrust ball bearing 11, when the bearing nut 7 is rotated, the tray 8 does not rotate along with the bearing nut 7, so that a weighing sensor 10 cannot be driven to rotate when the bearing nut 7 rotates, a bearing screw 6 and the bearing nut 7 are main bearing parts when in use, the force supported by the weighing sensor 10 is transmitted to the bearing screw 6 and the bearing nut 7 through a lower top block 9, the tray 8 and the thrust ball bearing 11, because the bearing screw 6 and the bearing nut 7 are in threaded connection and need to bear larger force, a 45-degree sawtooth thread tooth form (JB/T2001.73-1999) of a water system with stronger bearing capacity is selected as a thread pair, the scheme is YS220 multiplied by 8, the combined use is realized, and the rotary arm 2 with the maximum weight of 200T is arranged, the weighing sensor 10 is selected to bear 100t of weighing sensor at the maximum, even if only three sensors are stressed, each sensor still can be ensured not to exceed the working range, the thread pair is used for ensuring that the weighing sensor 10 can be detached under the condition of not detaching the rotating arm 2, so that the effect of convenient maintenance and replacement is achieved, and on the other hand, the thread pair also enables the weighing sensor 10 to have the lifting function, so that the whole stress of four weighing sensors 10 is ensured.

Further, a lower top block 9 is arranged at the top of the tray 8, and the bottom of the weighing sensor 10 is placed on the lower top block 9.

Further, the bottom of the weighing sensor 10 is provided with a stop lever 12, the top of the lower top block 9 is vertically provided with a rotation stop pin 13, and the stop lever 12 in the scheme is horizontally arranged and used for being matched with the stop lever 12 to limit the rotation of the weighing sensor 10.

Furthermore, supporting grooves are formed in the bottom of the upper ejector block 4 and the top of the lower ejector block 9, and the top and the bottom of the weighing sensor 10 are arranged in the supporting grooves of the upper ejector block 4 and the lower ejector block 9 respectively.

Further, the top and the bottom of the weighing sensor 10 are arranged in a spherical structure.

Furthermore, a connecting flange is arranged outside the upper end of the bearing screw 6, the mounting hole is a counter bore, and the connecting flange on the bearing screw 6 is arranged in the counter bore and connected with the rotating arm support 1 through a bolt.

Furthermore, gaps exist between the rotating arm 2 and the rotating arm support 1 in all directions.

In the scheme, the traditional force measuring assembly 14 is further arranged on the rotating arm support 1, and the rotating arm of the centrifuge can have a static weighing function and a dynamic unbalance force measuring function by combining the real-time monitoring of the unbalance force during the operation of the centrifuge and the static weighing device 3.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Those skilled in the art can make numerous possible variations and modifications to the described embodiments, or modify equivalent embodiments, without departing from the scope of the invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technology of the present invention are within the protection scope of the present invention, unless the content of the technical solution of the present invention is departed from.