Patent Description:
<FIG> is a schematic structural diagram of a known deadweight force standard machine. As shown in <FIG>, the deadweight force standard machine is a machine that takes the gravity of weights as standard loads, and automatically and smoothly apply the loads to a tested sensor directly in a pre-set sequence through an appropriate mechanism.

The deadweight force standard machine comprises a weight platform <NUM>, a plurality of weights <NUM>, a deadweight force standard machine frame <NUM>, a deadweight force standard machine reverse frame <NUM> and a sensor <NUM>, wherein the weights <NUM> are placed on the weight platform <NUM> after being connected sequentially via one or more eye bolts <NUM>. The deadweight force standard machine reverse frame <NUM> is installed on the deadweight force standard machine frame <NUM>. The sensor <NUM> is arranged on the deadweight force standard machine frame <NUM> and is in contact with the deadweight force standard machine reverse frame <NUM>. The weights <NUM> are connected to the deadweight force standard machine reverse frame <NUM> via a weight disk <NUM>, and the weights <NUM> are loaded on the deadweight force standard machine frame <NUM> by means of the deadweight force standard machine reverse frame <NUM>.

The known deadweight force standard machine has the following disadvantages:.

The weights move downwards, the upper loaded weight is lifted up and loaded on the sensor. In an optimized control method, the weights move at the same speed, and the above problems are caused because the deadweight force standard machine and the weights themselves are unstable.

In view of these shortcomings, the applicant's inventors have devised a new weight stability control method for a deadweight force standard machine.

The technical problem to be solved by the present invention is the shaking of weights when the weights are moved at the same speed in the prior art deadweight force standard machine.

The present invention solves the above technical problem through a weight stability control method for a deadweight force standard machine as defined in claim <NUM>. The deadweight force standard machine comprising one or more weights connected sequentially from top to bottom, and stacked on a weight platform; the uppermost, first-stage weight being connected to a weight disk via one or more lifting components, one or more lifting components being installed in between every two adjacent weights. The weight stability control method comprising the following steps: S1, performing a no-load stroke in which the weight platform rapidly moves downwards from an initial position until the weight disk lifts the first-stage weight; S2, performing a loaded stroke in which when the first-stage weight interacts with the weight disk via the corresponding lifting components for the first time, the weight platform starts to be slowly displaced downwards; S3, after the first-stage weight is completely separated from the weight disk, rapidly displacing the weight platform downwards again until a gap between the first-stage weight and the weight disk reaches half of a pre-set gap value; and S4, repeating steps S1-S3 in the loading process of the first-stage weight for the second-stage weight all through to the nth-stage weight in sequence until all the weights are loaded.

According to one embodiment of the present invention, the lifting components are eye bolts, the weight disk and the weights are each provided with one or more lifting holes, the eye bolts are installed in the corresponding lifting holes and are connected to the corresponding weights below the eye bolts.

According to one embodiment of the present invention, the lifting holes are conical through holes. Each of the lifting holes comprises an upper end opening and a lower end opening. The upper end opening is larger than the lower end opening of each lifting hole, and the eye bolts are arranged in the lifting holes in a penetrating manner.

According to one embodiment of the present invention, each eye bolt comprises an eye bolt head and a lifting rod, the eye bolt head is arranged at one end of the lifting rod, and the other end of the lifting rod is connected to the weight immediately below the lifting rod, and the width of the eye bolt head is larger than that of the lower end opening of the corresponding lifting hole.

According to one embodiment of the present invention, a displacement detector, an infrared detector, a laser detector or a draw-wire sensor is installed on the weight platform and configured to detect coordinates of the weight platform and displacements of the weights.

According to one embodiment of the present invention, the speed of the rapid displacement in steps S1 and S3 is <NUM>/s.

According to one embodiment of the present invention, the speed of the slow displacement in step S2 is <NUM>/s.

According to one embodiment of the present invention, in step S2, a force of friction generated between the first-stage weight and the second-stage weight due to swinging forms the damping of the swinging of the first-stage weight.

The positive and progressive effects of the present invention are as follows: the weight stability control method for a deadweight force standard machine of the present invention enables the manual collection and calculation of internal parameters such as the displacements and the number of weights. The method aids in determining the boundaries between rapid displacement and slow displacement. The method also helps in determining the magnitude of rapid displacement by means of peripheral infrared, laser and draw-wire sensors, thereby achieving control over the stability of weights. The problem associated with the shaking of weights is effectively solved, thereby improving the testing efficiency.

The aforementioned features, properties and advantages of the present invention will become clearer based on the description below in conjunction with the accompanying drawings and embodiments, and the same features are denoted by the same reference numerals throughout the figures, in which:.

To make the above objects, features and advantages of the present invention more apparent and easier to understand, specific implementations of the present invention are described in detail below with reference to the accompanying drawings.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The same reference numerals used in all the accompanying drawings denote identical or similar parts wherever possible.

Furthermore, although the terms used in the present invention are selected from well-known common terms, some of the terms mentioned in the description of the present invention may have been selected by the applicant according to his or her determination, and the detailed meaning thereof is described in the relevant section described herein.

Furthermore, the present invention must be understood, not simply by the actual terms used but also by the meanings encompassed by each term.

<FIG> is a schematic diagram of a weight stability control method for a deadweight force standard machine of the present invention.

As shown in <FIG>, the present invention discloses a weight stability control method for a deadweight force standard machine comprising one or more weights <NUM>, <NUM>, <NUM> connected sequentially from top to bottom. The weights are stacked on a weight platform <NUM>, the uppermost, first-stage weight <NUM> is connected to a weight disk <NUM> via one or more lifting components <NUM>, and one or more lifting components <NUM> are installed in between every two adjacent weights. The weight stability control method comprises the steps S1 to S4.

Firstly, according to Step S1, a no-load stroke is performed, and the weight platform <NUM> starts to be rapidly displaced downwards from the initial position until the first-stage weight <NUM> is lifted up by the weight disk <NUM> via the corresponding lifting components <NUM>. Then the first-stage weight <NUM> starts to be loaded.

At S2, a loaded stroke is performed when the first-stage weight <NUM> is in contact communication with the weight disk <NUM> via the corresponding lifting components <NUM>, then the weight platform <NUM> starts to be slowly displaced downwards. At the same time, the second-stage weight <NUM> is moving downwards as it is still on the weight platform <NUM>. The slow displacement is used for separation of the first-stage weight <NUM> and the second-stage weight <NUM>, such the shaking of the weights can be effectively reduced. For example, contact and separation of the weights may also be indicated by an I/O signal or by using fixed displacement coordinates. In the slow process, the force of friction caused by swinging can act as the damping of the swinging of the weights, and the swinging amplitude of the weights in the loading and unloading processes is reduced.

At S3, when the first-stage weight <NUM> is lifted up and separated from the second-stage weight <NUM>, the weight platform <NUM> is rapidly displaced downwards again until a gap between the first-stage weight <NUM> and the second-stage weight <NUM> reaches half of a pre-set gap value.

At S4, steps S1-S3 in the loading process of the first-stage weight <NUM> are repeated for the second-stage weight <NUM>.

Similarly, after loading the first-stage weight <NUM> is finished, the second-stage weight <NUM> starts to be loaded. At S1, the first-stage weight <NUM> is relatively static as it is lifted up, the second-stage weight <NUM> will be moving downwards, the second-stage weight <NUM> is not in contact with the first-stage weight <NUM>, then the weight platform <NUM> starts to be rapidly displaced downwards. At S2, when the second-stage weight <NUM> interacts with the first-stage weight <NUM> via the corresponding lifting components <NUM> for the first time, the second-stage weight <NUM> starts to be loaded and the weight platform <NUM> starts to be slowly displaced downwards again. At S3, after it is determined that the second-stage weight <NUM> is completely separated from the third-stage weight <NUM>, the weight platform <NUM> starts to be rapidly displaced downwards again until the gap between the second-stage weight <NUM> and the third-stage weight <NUM> reaches a pre-set value.

Similarly, the above steps are repeated in sequence through to the next-stage weight to the nth-stage weight 10n until all the weights <NUM>, <NUM>, <NUM>, 10n are loaded.

Herein, the speed of the rapid displacement in steps S1 and S3 is <NUM>/s. The speed of the slow displacement in step S2 is preferably <NUM>/s.

Preferably, in the above embodiment, the lifting components <NUM> are eye bolts. The weight disk <NUM> and the weights (<NUM>, <NUM>, <NUM>) are each provided with a plurality of lifting holes <NUM>, and the eye bolts are installed in the corresponding lifting holes <NUM> and are connected to the corresponding weights below the eye bolts. The lifting holes <NUM> are preferably conical through holes. An upper end opening <NUM> is larger than a lower end opening <NUM> of each lifting hole <NUM>. The eye bolts are arranged in the lifting holes <NUM> in a penetrating manner.

Further, each eye bolt comprises an eye bolt head <NUM> and a lifting rod <NUM>, the eye bolt head <NUM> is arranged at one end of the lifting rod <NUM>, the other end of the lifting rod <NUM> is connected to the weight immediately below the lifting rod. The width of the eye bolt head <NUM> is larger than that of the lower end opening of the corresponding lifting hole <NUM>.

Further, a displacement detector, an infrared detector, a laser detector or a draw-wire sensor is installed on the weight platform <NUM> and configured to detect coordinates of the weight platform <NUM> and displacements of the weights, that is, to determine the boundaries between rapid displacements and slow displacement. The displacements correspond to the number of the weights on a one-to-one basis, and the infrared and laser detectors need the provision of additional components for detection. In addition, the deadweight force standard machine reads data of a tested sensor after all the weights are loaded or after each S3 to monitor the loading process.

Herein, the weights (<NUM>, <NUM>, <NUM>) are isolated from the weight platform <NUM> by an insulating material so as to avoid conducting between the weights (<NUM>, <NUM>, <NUM>) and the weight platform <NUM>. Friction abutment detection devices, such as voltage and current on-off detection devices for detecting the weights, are installed on the machine frame and the weight platform <NUM> of the deadweight force standard machine, and used for detecting contact (conducting) and separation (de-conducting) between the weights (<NUM>, <NUM>, <NUM>).

By means of the friction abutment detection devices (conducting and de-conducting) between the deadweight force standard machine frame <NUM> and the weights (<NUM>, <NUM>, <NUM>) and based on the displacement detector, the infrared detector, the laser detector or the draw-wire sensor, relative coordinates (namely the boundaries between the rapid displacements and the slow displacement) of the weight platform <NUM> are determined.

<FIG> is a magnified view of a gap in part A in <FIG>. Under ideal conditions, the adjacent weights can be separated instantly because of being absolutely horizontal. In practice, however, a force standard machine system is not absolutely horizontal due to technical reasons such as machining or assembly.

<FIG> demonstrates a scenario where the diameter of each weight (<NUM>, <NUM>, <NUM>) is <NUM> and the side normal to the diameter is <NUM>. Where the freely-hung weights are disposed absolutely horizontal due to gravity, the slope of the weight platform (<NUM>) is <NUM>/<NUM>, and the moving speed of the weights is <NUM>/s, the weights (<NUM>, <NUM>, <NUM>) would be completely separated within <NUM>.

In conclusion, the weight stability control method for the deadweight force standard machine of the present invention can utilize internal parameters such as the displacements and the number of weights, or peripheral infrared, laser and draw-wire sensors to find boundaries between rapid displacement, slow displacement and rapid displacement, such that control over the stability of the weights is achieved, the problem of shaky weights is effectively resolved, and the testing efficiency is improved.

Claim 1:
A weight stability control method for a deadweight force standard machine comprising a weight platform (<NUM>);
one or more weights (<NUM>, <NUM>, <NUM>, 10n) connected sequentially from top to bottom and stacked on the weight platform (<NUM>);
a weight disk (<NUM>); and
one or more lifting components (<NUM>);
wherein a first-stage weight (<NUM>) of the one or more weights (<NUM>, <NUM>, <NUM>, 10n) is connected to the weight disk (<NUM>) via the lifting components (<NUM>) that are installed in between every two adjacent weights (<NUM>, <NUM>, <NUM>, 10n),
characterized in that the weight stability control method comprising the following steps:
S1, performing a no-load stroke in which the weight platform (<NUM>) rapidly moves downwards from an initial position until the weight disk (<NUM>) lifts the first-stage weight (<NUM>) via the corresponding lifting components (<NUM>);
S2, performing a loaded stroke in which the weight platform (<NUM>) starts to be slowly displaced downwards when the first-stage weight (<NUM>) is in contact communication with the weight disk (<NUM>) via the corresponding lifting components (<NUM>);
S3, after the first-stage weight (<NUM>) is completely separated from the weight disk (<NUM>), rapidly displacing the weight platform (<NUM>) downwards again until a gap between the first-stage weight (<NUM>) and the weight disk (<NUM>) reaches half of a pre-set gap value; and
S4, repeating steps S1-S3 in the loading process of the first-stage weight (<NUM>) for the second-stage weight (<NUM>) all through to the nth-stage weight (10n) in sequence until all the weights are loaded.