KR102079260B1 - Apparatus for measuring screw efficiency and method for measuring screw efficiency - Google Patents

Abstract

The present invention relates to an apparatus for measuring efficiency of a screw. The apparatus comprises: a rotating motor unit to rotate a screw; a pressing jig unit which guides an operating nut screw-coupled to the screw rotated by the rotating motor to be linearly moved, and is moved in both directions by the operating nut linearly moved in both directions; and a load cell to measure an upward load and a downward load created by the pressing jig unit. Bidirectional efficiency of the screw for straight moving power of the screw converted by rotating power, namely torque of the motor can be accurately measured. Main components can be designed and selected to satisfy a main performance such as driving torque and driving speed required in a guided missile by accurately measuring bidirectional efficiency for straight moving power of the screw.

Description

Device for measuring bidirectional efficiency of screw and measuring method for bidirectional efficiency using screw {APPARATUS FOR MEASURING SCREW EFFICIENCY AND METHOD FOR MEASURING SCREW EFFICIENCY}

The present invention relates to a device for measuring the efficiency of the screw and a method for measuring the efficiency of the screw using the same. More specifically, the efficiency of the screw that can measure the efficiency of the rotational force of the motor, that is, the straight force of the screw converted by the torque in both directions The present invention relates to a measuring device and a method of measuring the efficiency of a screw using the same.

Generally, a screw is used to convert the rotational force of a rotating motor into linear movement.

The actuator of the missile is an apparatus designed to accurately move a control target such as a driving blade through a power transmission process such as a screw or a gear by using a power source such as a motor.

At this time, it is very important to design and select the main parts to satisfy the main performance such as drive torque and drive speed required in the missile.

In particular, the performance of the drive blade, the final output part, is determined by the efficiency of the power transmission unit (screws, gears, etc.). It is therefore necessary to design and manufacture a drive system that meets the requirements of guided missiles. This is a major consideration.

However, until now, the method of measuring the efficiency of the screw (lead screw, ball screw, etc.), which is one of the core components of the power transmission unit, has not been standardized.

0001) Korea Patent Registration No. 1738717 'Backlash Measuring Device of Rack Bar' (registered on May 16, 2017)

An object of the present invention is to provide a screw efficiency measuring device capable of accurately measuring the efficiency of the rotational force of the motor, that is, the straight force of the screw converted by the torque in both directions, and a method of measuring the efficiency of the screw using the same.

Another object of the present invention is to accurately measure the efficiency of the screw linear force to measure the efficiency of the screw to design and select the main components to satisfy the main performance, such as drive torque, drive speed required in the missile And to provide a method for measuring the efficiency of the screw using the same.

In order to achieve the above object, an embodiment of the screw efficiency measuring apparatus according to the present invention is a rotary motor unit for rotating the screw, the operating nut screwed to the screw rotated by the rotary motor unit to guide the linear movement And, it characterized in that it comprises a load cell for measuring the upward load and the downward load generated by the pressing jig portion, bi-directionally moved by the operating nut is bidirectional linear movement, respectively.

In the present invention, the pressurizing jig portion is located in the operating nut screwed to the screw to guide the linear movement of the actuating nut and the nut guide member and the nut guide member to move in both directions linearly by the linear movement of the actuating nut And a base jig member positioned therein and guiding the linear movement of the nut guide member in both directions, wherein the load cell and the nut guide member are connected to each other by a pressure guide protrusion so that the load pulled when the nut guide member is lifted is increased. Is generated in, the load is applied to the load cell when the nut guide member is lowered.

In the present invention, the nut guide member has a nut movement guide space for inserting the actuating nut therein to guide the vertical movement of the actuating nut, and on the inner circumferential surface of the nut movement guide space of the actuating nut during rotation of the screw. A nut guide rail may be positioned to limit rotation to guide linear movement of the actuation nut.

In the present invention, the first spring member and the second spring member for elastically supporting the operating nut in both directions in which the operating nut is moved may be located inside the nut movement guide space.

In the present invention, a spring support for supporting the second spring member is located on an open side of the nut movement guide space, and the second spring member is positioned between the spring support and the actuating nut, and the first spring member. Can be located between the actuation nut and the bottom of the nut movement guide space.

In the present invention, the bottom of the nut movement guide space may be a spring support protrusion is inserted into the first spring member which is a coil spring to support the position of the first spring member.

In the present invention, the spring support protrusion may have a diameter larger than that of the screw to prevent the operating nut from being separated from the screw.

An embodiment of the screw efficiency measuring apparatus according to the present invention may further include a measurement control unit for controlling the operation of the rotary motor unit, and receiving the load of the bidirectional measured from the load cell, respectively to calculate the bidirectional efficiency of the screw, respectively. have.

로 스크류의 효율을 계산할 수 있다. In the present invention, the measurement control unit is the equation through the torque value (T) of the rotary motor unit and the load value (F) measured by the load cell

The efficiency of the furnace screw can be calculated.

(η: screw efficiency, L: screw lead, T: torque value (stall torque / Nm) of the rotating motor part 100, F: axial force (load value measured by load cell))

One embodiment of the method for measuring the efficiency of the screw according to the present invention in order to achieve the above object is a screw preparation step of positioning the screw so as to move in both directions in the direction of movement of the operating nut by fastening the operating nut to the screw, The first load measuring step of measuring the first load generated by the load cell, the first load generating step of generating a load on the load cell by moving the operating nut in any direction by rotating with a rotary motor unit A first screw efficiency calculation step of calculating the efficiency of the screw with the first load value measured in the first load measurement step, by moving the screw in the other direction to the rotary motor part to move the operating nut in another direction Second load generation step of generating a load on the load cell, the second load generated by the second load generation step Second load measuring step of measuring a deusel, characterized in that it includes a second screw-efficiency calculating step of calculating the efficiency of the second screw into the second load value measured at the load measuring step.

In the present invention, the first load generation step is the process of moving the operating nut is lowered by the rotation of the screw toward the load cell, the process of compressing the first spring member by the movement of the operating nut and the first spring member The nut guide member is moved while being compressed may include a step of pressing the load cell.

In the present invention, in the first load generating step, the nut guide member may be moved to pressurize the load cell after the actuating nut compresses the first spring member to the maximum.

In the present invention, the second load generating step is the process of lifting the operating nut in the opposite direction of rotation of the screw, the process of compressing the second spring member by the movement of the operating nut and the nut while the second spring member is compressed The guide member may be moved to pull the load cell to generate a load on the load cell.

In the present invention, the second load generating step may compress the second spring member to the maximum by the movement of the actuating nut, and then push the spring support to pull up the nut guide member to generate a load by pulling the load cell. .

로 스크류의 효율을 계산할 수 있다. In the present invention, the first screw efficiency calculation step and the second screw efficiency calculation step are the equation through the torque value (T) and the load value (F) measured by the load cell of the rotating motor unit

The efficiency of the furnace screw can be calculated.

(η: screw efficiency, L: screw lead, T: torque value (stall torque / Nm) of the rotating motor part 100, F: axial force (load value measured by load cell))

The present invention has the effect of accurately measuring the bidirectional efficiency of the screw with respect to the rotational force of the motor, that is, the straight force of the screw converted by the torque.

The present invention has the effect of designing and selecting the main parts to accurately measure the bi-directional efficiency for the straight force of the screw, respectively, to satisfy the main performance, such as drive torque, drive speed required in the missile.

1 is a perspective view showing an efficiency measuring device of a screw according to the present invention.
Figure 2 is a perspective view showing an example of disassembling the rotary motor unit in an embodiment of the efficiency measuring device of the screw according to the present invention.
3 is a cross-sectional view showing an embodiment of a screw efficiency measuring apparatus according to the present invention.
Figure 4 is a block diagram showing an embodiment of a method of measuring the efficiency of the screw according to the present invention.

Hereinafter, the present invention will be described in more detail.

When described in detail with reference to the accompanying drawings a preferred embodiment of the present invention. Prior to the description of the present invention, the terms or words used in the specification and claims described below should not be construed as being limited to the ordinary or dictionary meanings. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a perspective view showing an efficiency measuring device of the screw according to the present invention, Figure 2 is a perspective view showing an example of disassembly of the rotating motor in an embodiment of the efficiency measuring device of the screw according to the present invention, Figure 3 Sectional drawing which shows one Example of the efficiency measurement apparatus of the screw which concerns on this invention.

With reference to Figures 1 to 3 will be described in detail below the efficiency measuring device of the screw 10 according to the present invention.

Screw efficiency measuring apparatus according to the present invention includes a rotary motor unit (100).

The rotary motor unit 100 is mounted to the pressure jig 200 and is positioned with the screw 10 downward and vertically upright.

The pressure jig 200 is a driving nut 20 screwed to the screw 10 is located therein to guide the linear movement of the actuating nut 20 and the bidirectional linear movement by the linear movement of the actuating nut 20 The nut guide member 210 and the nut guide member 210 are positioned therein and include a base jig member 220 for guiding the linear movement of the nut guide member 210 in both directions.

The nut guide member 210 has a nut movement guide space 210a for inserting the actuating nut 20 therein to guide the vertical movement of the actuating nut 20.

And, on the inner circumferential surface of the nut movement guide space 210a is located a nut guide rail 211 for guiding the linear movement of the actuating nut 20 by limiting the rotation of the actuating nut 20 when the screw 10 is rotated. .

The nut guide rail 211 is an example of a moving rail having a protruding shape so as to be inserted into a nut groove located at both sides of the actuating nut 20.

The nut guide rail 211 is positioned to face the inner circumferential surface of the nut movement guide space 210a and is vertically and vertically positioned so that the nut guide rail 211 is inserted into a nut groove located on both sides of the actuating nut 20 so that the actuating nut ( Limit the rotation of 20 and guide the linear movement of the actuating nut 20.

The nut guide rail 211 is formed in a shape corresponding to the nut groove to guide the linear movement of the operation rail.

In addition, the nut guide rail 211 may have a rail groove shape in which a part of the operating nut 20 may be inserted into the inner circumferential surface of the nut movement guide space 210a.

The rail guide nut guide rail 211 is formed to have a shape in which a part of the actuating nut 20 can be inserted and is vertically positioned to guide the linear movement of the actuating nut 20.

In this case, nut protrusions (not shown) that may be inserted into both side surfaces of the actuating nut 20 may be inserted into the nut guide rail 211 having a rail groove shape.

In addition, the rail guide nut guide rail 211 has a shape corresponding to the nut protrusion and is formed in a direction perpendicular to the inner circumferential surface of the nut movement guide space 210a to insert the nut protrusion to operate the nut when the screw 10 rotates. It limits the rotation of 20 and guides the linear movement of the actuating nut 20.

The operating nut 20 is screwed to the screw 10 through the screw 10 to be measured, and the operating nut when the screw 10 is rotated by the nut guide rail 211 in the nut movement guide space 210a. The rotation of 20 is limited and linearly moved.

The rotary motor unit 100 is an example of a screw-integrated rotary motor in which the screw to be measured is integrally provided.

The rotary motor unit 100 rotates the screw 10 forward to move the operating nut 20 forward, that is, downward, and pressurizes the load cell 300, or the operating nut 20 reverses, that is, upward. The screw 10 may be reversely rotated to move and pull the load cell 300.

The nut guide member 210 is located in the base jig member 220 so as to be movable, and the load applied by the nut guide member 210 to the lower side of the nut guide member 210 in the base jig member 220. The load cell 300 that can measure the position is located.

The base jig member 220 has a pressurized space in which the nut guide member 210 is movably positioned, and the load cell 300 is positioned at the lower side of the nut guide member 210 in the pressurized space.

The load cell 300 detects and measures the load generated by the nut guide member 210 that is pressed by the operating nut 20 and moved downward.

Inside the nut movement guide space 210a, a first spring member 410 and a second spring member 420 which elastically support the actuating nut 20 in both directions in which the actuating nut 20 is moved, are positioned. For example, the spring member 410 and the second spring member 420 may be coil springs compressed by an actuating nut 20 which is bidirectionally moved by the screw 10.

The first spring member 410 is located between the actuating nut 20 and the bottom surface of the nut movement guide space 210a, and the second spring member 410 is the actuating nut 20 and the rotating motor part 100. Located between).

On the open side of the nut movement guide space 210a, that is, on the upper side, a spring support part 400 supporting the second spring member 420 is located, and the second spring member 420 has a spring support part 400 and an operating nut. Located between 20.

The spring support 400 is detachably coupled to the nut guide member 210 and has a plate shape in which a screw through hole 400a through which the screw 10 penetrates is formed.

The actuating nut 20 is positioned in the middle of the screw 10 to be elastically supported by the second spring member 420 to the upper side and elastically supported by the first spring member 410 to the lower side.

At the bottom of the nut movement guide space 210a, a spring support protrusion 212 supporting the position of the coil spring, that is, the first spring member 410 is located.

The screw 10 sequentially penetrates through the spring support 400 and the second spring member 420, and a working screw is fastened, and a part of one end thereof is positioned into the first spring member 410.

The first spring member 410, which is a coil spring, is positioned at the center of the nut movement guide space 210a while the spring support protrusion 212 is inserted and inserted therein, and is uniformly pressed by the operation nut 20 to operate the nut. The pressing force of 20 may be transmitted to the nut guide member 210.

The spring support protrusion 212 may have a diameter larger than that of the screw 10 to prevent the operation nut 20 from being caught and falling out of the screw 10.

In addition, the second spring member 410, which is a coil spring, is positioned through the skew 10 and is guided in a vertical direction by a screw to be uniformly pressurized by the actuating nut 20 to pressurize the actuation nut 20. To be delivered to the nut guide member 210.

The first spring member 410 and the second spring member 420 prevent damage caused by the impact generated when the actuating nut 20 directly collides with the nut guide member 210 as well as the nut guide member stably. 210 serves to transfer the load to pressurize the load cell 300.

When the actuating nut 20 directly collides with the nut guide member 210 and a sudden load is applied to the load cell 300, the reliability of the load value measured by the load cell 300 is measured in measuring the efficiency of the screw 10. Uncertainty may occur.

The first spring member 410 and the second spring member 420 is compressed by the downward movement of the operating nut 20 to absorb the shock, and then the nut guide member 210 is compressed after the spring member 400 is fully compressed. The load cell 300 is pushed down so that the load value applied to the load cell 300 can be stably and accurately secured, thereby stably and accurately calculating and calculating the efficiency of the screw 10.

In addition, the load cell 300 is coupled to the lower surface of the nut guide member 210 at the center thereof so as to protrude the pressure guide protrusion 310 to measure the bidirectional load of the nut guide member 210.

The pressure guide protrusion 310 may be coupled to the lower surface of the nut guide member 210 to transfer the bidirectional load of the nut guide member 210, that is, the load generated on the upper side and the load generated on the lower side, to the load cell 300, respectively. have.

That is, the pressure guide protrusion 310 generates a load on the load cell 300 by pressing the load cell 300 when the nut guide member 210 moves to the lower side, and is pulled when the nut guide member 210 moves to the upper side. The load is generated at 300.

When the screw 10 rotates in the forward direction, the operating nut 20 compresses the first spring member 410 while descending to the lower side, and then lowers the nut guide member 210 to press the load cell 300 to press the load cell 300. Will generate a load.

Then, the screw 10 is rotated in the reverse direction and the operating nut 20 is pushed to the upper side while compressing the second spring member 420 and then push the screw support to lift the nut guide member 210 to raise the pressure guide protrusion 310 The load is generated in the load cell 300 while pulling).

In addition, the efficiency measuring device of the screw 10 according to the present invention controls the operation of the rotating motor unit 100, and receives the load for both directions measured from the load cell 300, respectively, to improve the bidirectional efficiency of the screw 10 The measurement control unit 500 may further include a calculation.

The measurement controller 500 includes an input unit 520 for inputting a torque value of the rotary motor unit 100 or a lead value of the screw 10, and displays a display for outputting and displaying the calculated efficiency of the screw 10. It may include a part 510.

In addition, the measurement control unit 500 may be a preset torque value of the rotary motor unit 100, and may include a motor operation control unit for controlling the operation of the rotary motor unit 100 to rotate to a predetermined torque value.

The measurement control unit 500 uses the torque value T of the rotary motor unit 100 and the screw 10 as the following equation 1 through the bidirectional load value F of the operating nut 20 measured by the load cell 300. Calculate the bi-directional efficiencies of

η: screw efficiency

L: Lead of screw

T: Torque value (stall torque / Nm) of the rotary motor unit 100

F: Axial force (load value measured by load cell)

The lead value of the screw 10 and the torque value of the rotary motor unit 100 may be pre-stored in the measurement control unit 500 at preset values in the specifications of the screw 10 and the motor specifications. It turns out that can be input to the measurement control unit 500 through the input unit 520 to the specifications and motor specifications, respectively.

On the other hand, Figure 5 is a block diagram showing an embodiment of a method of measuring the efficiency of the screw according to the invention, referring to Figures 4 and 5, the method of measuring the efficiency of the screw according to the present invention operates on the screw 10 Screw preparation step (S100), the screw 10 is rotated to the rotating motor unit 100 by fastening the nut 20 to be moved in both directions in the movement direction of the operating nut 20 to operate the operating nut 20 The first load generation step (S200) for moving the load in one direction to generate a load on the load cell 300, the first load measurement step (S300) for measuring the first load generated by the first load generation step, the load cell The first screw efficiency calculation step (S400) for calculating the efficiency of the screw 10 with the first load value measured in the first load measurement step (S300), rotating the screw 10 in the other direction by the rotary motor unit 100 When the load occurs on the load cell 300 by moving the operating nut 20 in the other direction Is a second load measurement step (S500), the second load measurement step (S600), the second load measurement step (S600) for measuring the second load generated in the second load generation step by the load cell As a second screw efficiency calculation step (S700) for calculating the efficiency of the screw (10).

The first load generation step (S200) is a process of moving the operating nut 20 is lowered by the rotation of the screw 10 toward the load cell 300, the first spring member 410 by the movement of the operating nut 20 Compression process, while the first spring member 410 is compressed, the nut guide member 210 is moved to press the load cell 300.

The first load generating step (S200) is the nut guide member 210 after the operating nut 20 is directly impacted by the load cell 300, the spring member 400 is compressed to the maximum by the movement of the operating nut 20 without pressing. ) Is moved to pressurize the load cell 300.

In addition, the second load generating step (S500) is a process of lifting the operating nut 20 in the opposite direction of rotation of the screw 10, a process of compressing the second spring member 420 by the movement of the operating nut 20, As the second spring member 410 is compressed, the nut guide member 210 is moved to pull the load cell 300 to generate a load on the load cell 300.

In the second load generation step S500, the spring support part is compressed after the second spring member 420 is maximally compressed by the movement of the actuating nut 20 without directly pressing the actuating nut 20 against the spring support part 400. By pushing the 400, the nut guide member 210 is lifted to pull the load cell 300 to generate a load.

The first screw efficiency calculation step S400 and the second screw efficiency calculation step S700 calculate the efficiency η of the screw 10 by Equation 2 below.

η: screw efficiency

L: Lead of screw

T: Torque value of rotating motor part (stall torque / Nm)

F: Axial force (load value measured by load cell)

The present invention can accurately measure the rotational force of the motor, that is, the efficiency with respect to the straight force of the screw 10 converted by the torque in both directions of the screw 10.

The present invention is to measure the efficiency of the straight force of the screw 10 in both directions accurately to design and select the main components to satisfy the main performances such as drive torque, drive speed required in the missile.

The present invention is not limited to the above-described embodiments, but can be embodied in various modifications without departing from the gist of the present invention, which is understood to be included in the constitution of the present invention.

10 screw 20 operating nut
21: nut groove 100: rotary motor part
110: screw adapter portion 200: pressure jig portion
210: nut guide member 210a: nut movement guide space
211: nut guide rail 212: spring support protrusion
220: base jig member
300: load cell 310: pressure guide protrusion
400: spring support 410: first spring member
420: second spring member 500: measurement control unit
510: display unit 520: input unit

Claims (15)

Rotating motor unit for rotating the screw;
A pressurizing jig unit which guides the operating nut screwed to the screw rotated by the rotary motor unit to be linearly moved, and is bidirectionally moved by the operating nut which is bidirectionally linearly moved; And
It includes a load cell for measuring the upward load and the downward load generated by the pressing jig portion, respectively,
The pressure jig portion,
A nut guide member having the actuating nut screwed into the screw to guide the linear movement of the actuating nut and linearly moving in both directions by the linear movement of the actuating nut; And
The nut guide member is located therein and includes a base jig member for guiding the linear movement of the nut guide member in both directions,
The load cell and the nut guide member are connected to each other by a pressure guide protrusion so that a load to be pulled when the nut guide member is lifted is generated in the load cell, and a load to be pressed when the nut guide member is lowered is generated in the load cell.
The nut guide member has a nut movement guide space for inserting the operating nut therein to guide the vertical movement of the operating nut,
A nut guide rail is positioned on the inner circumferential surface of the nut movement guide space to guide the linear movement of the actuation nut by limiting the rotation of the actuation nut when the screw is rotated.
A first spring member and a second spring member are disposed in the nut movement guide space to elastically support the actuation nut in both directions in which the actuation nut is moved.
A spring support for supporting the second spring member is located on an open side of the nut movement guide space,
The second spring member is located between the spring support and the actuating nut,
The first spring member is located between the operating nut and the bottom of the nut movement guide space,
When the actuating nut is lowered, the first spring member is compressed to transfer a load to the nut guide member, and the nut guide member is configured to press the first load to press the load cell through the load received by the first spring member. To generate a first load value with the load cell,
When the actuating nut is elevated, the second spring member is compressed to transfer a load to the nut guide member, and the nut guide member generates a load that is pulled by the load cell through a load received by the second spring member. A second load value is measured by the load cell,
It further includes a measurement control unit for controlling the operation of the rotary motor unit, receiving the first load value and the second load value measured from the load cell, respectively, and calculates the bidirectional efficiency of the screw,
The measurement control unit is a mathematical expression through the torque value (T) of the rotary motor unit and the first load value (F) and the second load value (F) measured by the load cell

A efficiency measuring device for a screw, characterized in that for calculating the efficiency for both directions of the furnace screw.
(η: screw efficiency, L: screw lead, T: torque value (stall torque / Nm) of rotating motor part 100, F: axial force (load value measured by load cell))
delete delete delete delete The method according to claim 1,
The bottom of the nut movement guide space is inserted into the first spring member which is a coil spring is a spring supporting projection for supporting the position of the first spring member is located, the efficiency measuring device of the screw.
The method according to claim 6,
The spring support protrusion has a larger diameter than the screw to prevent the operating nut from being separated from the screw.
delete delete A screw preparation step of fastening the operating nut to the screw so as to be movable upward and downward in the moving direction of the operating nut;
A first load generating step of rotating the screw with a rotary motor unit to lower the operation nut to press and lower the nut guide member primarily, and pressurize the load cell by the nut guide member to generate a load;
A first load measuring step of measuring the load generated by the first load generating step with the load cell;
A first screw efficiency calculating step of calculating the efficiency of the screw with the first load value measured in the first load measuring step;
The second load is generated by rotating the screw in the other direction to the rotary motor unit to elevate the operating nut to push the nut guide member to the upper side, and to pull the load cell connected to the elevated nut guide member to generate a load on the load cell step;
A second load measuring step of measuring the load generated by the second load generating step with the load cell; And
Comprising a second screw efficiency calculation step of calculating the efficiency of the screw to the second load value measured in the second load measurement step,
The first load generation step,
Moving the operating nut toward the load cell by lowering the operating nut by the rotation of the screw;
Compressing the first spring member by the movement of the actuating nut; And
Comprising a step of pressing the load cell by the nut guide member is lowered while the first spring member is compressed,
The second load generation step,
The actuating nut is lifted by the opposite rotation of the screw;
Compressing the second spring member by elevating the actuating nut; And
And a step of generating a load on the load cell by pulling the load cell while the nut guide member is lifted while the second spring member is compressed.
The first screw efficiency calculation step and the second screw efficiency calculation step,
Equation through the torque value (T) of the rotary motor unit and the first load value (F) and the second load value (F) measured by the load cell

Method for measuring the bidirectional efficiency of the screw, characterized in that for calculating the bidirectional efficiency of the furnace screw.
(η: screw efficiency, L: screw lead, T: torque value (stall torque / Nm) of rotating motor part 100, F: axial force (load value measured by load cell))
delete The method according to claim 10,
The first load generating step is a screw bi-directional efficiency measuring method, characterized in that the actuating nut compresses the first spring member to the maximum and then the nut guide member is lowered to press the load cell.
delete The method according to claim 10,
The second load generation step,
And compressing the second spring member to the maximum by the movement of the actuating nut to push the nut guide member so that the nut guide member is elevated to pull the load cell to generate a load. delete

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