CN217980634U

CN217980634U - Screw-nut resistance moment testing device

Info

Publication number: CN217980634U
Application number: CN202221799201.9U
Authority: CN
Inventors: 葛科伟; 陆万里
Original assignee: Jiangsu Dingzhi Intelligent Control Technology Co ltd
Current assignee: Jiangsu Dingzhi Intelligent Control Technology Co ltd
Priority date: 2022-07-12
Filing date: 2022-07-12
Publication date: 2022-12-06
Anticipated expiration: 2032-07-12

Abstract

The utility model discloses a screw nut resistance moment testing device, which comprises an upper cover plate, a bottom plate, a torquemeter fixing mechanism, a nut rotating mechanism, a torquemeter, a screw rod, a nut to be tested and a plurality of guide shafts which are respectively fixed with the upper cover plate and the bottom plate; the torquemeter fixing mechanism is sleeved outside the guide shaft and adjustably fixed on the guide shaft, and the nut rotating mechanism is rotationally connected with the bottom plate. The torquemeter is fixed on the periphery of the screw rod, the nut to be tested is in threaded fit with the screw rod, the torquemeter fixing mechanism is used for fixing the torquemeter, the nut rotating mechanism is circumferentially fixed with the nut to be tested, and the rotating center of the nut rotating mechanism is coaxial with the screw rod. The utility model discloses a nut rotary mechanism drives the nut and rotates, need not exert radial force to the nut surface, the radial extrusion force that produces when not having artifical rotation nut for the test of nut resistance moment is more accurate.

Description

Screw-nut resistance moment testing device

Technical Field

The utility model relates to a testing arrangement technical field especially relates to a screw-nut moment of resistance testing arrangement.

Background

When the nut is installed on the screw rod, the nut moves up and down through the thread, friction is generated at the threaded connection part of the nut and the screw rod, the nut can be prevented from rotating due to friction, the torque for preventing the nut from rotating is the nut resisting torque, and the nut resisting torque value can be obtained through reading of a torque meter.

As shown in FIG. 1, in the existing nut resisting moment test, the end part of a screw rod is clamped by a torque meter, and the nut is rotated to read the reading of the torque meter so as to obtain the nut resisting moment value. The nut resisting moment test under the ideal state is that the nut is only subjected to force along the tangential direction of the excircle of the nut, the force enables the nut to rotate, so that friction force is generated between the nut and a screw rod, the friction force is transmitted to a torque meter through the screw rod, and the numerical value of the nut resisting moment can be known by reading the reading of the torque meter.

The realistic situation is when rotating the nut, because use artifical direct to rotate the nut, can't guarantee that the direction of application is along nut excircle tangential direction, the radial force when inevitable can produce the extrusion nut makes the nut resistance moment receive the influence to influence the accuracy of test result.

Secondly, the torquemeter in the prior art is not fixed, so when testing, the clamping of the torquemeter is easy to generate inclination of a certain angle, the nut and the screw rod have radial component force under the influence of gravity, the nut cannot be guaranteed to be only subjected to tangential force, and the test result is influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve among the prior art during the test of nut resistance moment, artifical swivel nut can make the nut receive radial extrusion force to the torque meter is not fixed, and the torque meter centre gripping easily produces the slope of certain angle, the nut can and the lead screw between have radial component under the influence of gravity, thereby influences the technical problem of test result accuracy, the utility model provides a lead screw nut resistance moment testing arrangement solves above-mentioned problem.

The utility model provides a technical scheme that its technical problem adopted is: a screw nut resisting moment testing device comprises an upper cover plate, a bottom plate, a torque meter fixing mechanism, a nut rotating mechanism, a torque meter, a screw rod, a nut to be tested and a plurality of guide shafts which are respectively fixed with the upper cover plate and the bottom plate; the torquemeter fixing mechanism is sleeved outside the guide shaft and adjustably fixed on the guide shaft, and the nut rotating mechanism is rotationally connected with the bottom plate.

The torquemeter is fixed on the periphery of the screw rod, the nut to be tested is in threaded fit with the screw rod, the torquemeter fixing mechanism is used for fixing the torquemeter, the nut rotating mechanism is circumferentially fixed with the nut to be tested, and the rotating center of the nut rotating mechanism is coaxial with the screw rod.

Furthermore, the torque meter fixing mechanism comprises a first positioning plate and a second positioning plate which are detachably fixed, and a guide hole for a guide shaft to pass through is formed in the first positioning plate and/or the second positioning plate; the edges of the first positioning plate and the second positioning plate are provided with bayonets matched with the outer surface of the torque meter, and the bayonets of the first positioning plate and the second positioning plate are mutually butted to form through holes tightly matched with the periphery of the torque meter.

Furthermore, the guiding hole is located on the first positioning plate, at least two first threaded holes are formed in the first positioning plate, first counter bores in one-to-one correspondence with the first threaded holes are formed in the surface of the second positioning plate, and screws penetrate through the first counter bores and are locked with the corresponding first threaded holes.

Further, the nut rotating mechanism comprises a nut plate and a fixing pin, the nut plate is rotationally connected with the bottom plate, and a first through hole for the screw rod to pass through and a plurality of first positioning holes for the fixing pin to insert are formed in the surface of the nut plate; the first positioning hole corresponds to a second positioning hole on the surface of the nut to be measured.

Furthermore, the first positioning holes are provided with two groups, and each group of first positioning holes consists of three first positioning holes arranged in a circumferential array.

Further, the nut rotating mechanism comprises a nut plate, a fixing pin and a copper shaft clamping plate, the nut plate is rotatably connected with the bottom plate, and a first through hole for the lead screw to pass through and a plurality of first positioning holes for the fixing pin to insert are formed in the surface of the nut plate; the copper shaft clamping plate is sleeved outside the nut to be tested, a third positioning hole corresponding to the first positioning hole is formed in the outer edge of the copper shaft clamping plate, and a second threaded hole is formed in the circumferential outer surface of the copper shaft clamping plate.

Furthermore, the bottom plate is matched with the nut plate through a bearing, a first counter bore and a second counter bore are coaxially arranged on the upper surface of the bottom plate from top to bottom in sequence, the first counter bore is matched with the periphery of the bearing, and the inner bottom surface of the second counter bore is abutted to the outer ring of the bearing; the lower surface of the nut plate is coaxially and sequentially provided with a first boss and a second boss, the first boss is matched with the inner periphery of the bearing, and the end face of the second boss is abutted to the inner ring of the bearing.

Furthermore, the axial both ends of guiding axle all are equipped with the third screw hole, all are equipped with the second counter sink with guiding axle locking fit on upper cover plate and the bottom plate.

Furthermore, linear bearings are fixed in the guide holes, the guide shafts penetrate through the linear bearings, and positioning rings are sleeved outside the guide shafts and below the first positioning plates.

Furthermore, the upper cover plate and the bottom plate are provided with second through holes for the screw rods to pass through.

The utility model has the advantages that:

(1) Feed screw nut resistance moment testing arrangement, drive the nut through nut rotary mechanism and rotate, need not exert radial force to the nut surface, the nut only receives the tangential force that nut rotary mechanism produced to the nut, does not have the radial extrusion force that produces when the artifical nut that rotates for nut resistance moment test is more accurate. Meanwhile, the torquemeter is fixed through the torquemeter fixing mechanism, and the level of the torquemeter is kept by the guide shaft, so that the gravity borne by the nut is completely parallel to the screw rod, radial component force cannot be generated, and the nut only bears tangential force, thereby improving the testing precision.

(2) Screw-nut resistance moment testing arrangement, not only be applicable to the nut that has the locating hole, still use in the resistance moment test of the copper axle of moulding plastics.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a schematic diagram of a prior art nut moment of resistance test configuration;

fig. 2 is a corresponding perspective view of an embodiment of the lead screw nut moment of resistance testing device according to the present invention;

FIG. 3 is an exploded view of the upper cover plate and guide shaft of FIG. 2;

FIG. 4 is a schematic illustration of the mounting of the torque meter securing mechanism and the torque meter of FIG. 2;

FIG. 5 is an exploded view of the first positioning plate and the guide shaft of FIG. 2;

fig. 6 is a perspective view of a first positioning plate of the present invention;

fig. 7 is a perspective view of a second positioning plate of the present invention;

FIG. 8 is a schematic view of the nut rotating mechanism of FIG. 2 assembled with a nut to be tested and a base plate;

FIG. 9 is a schematic view of the rotational connection of the nut plate to the base plate;

fig. 10 is a perspective view of the middle base plate of the present invention;

fig. 11 is a schematic view of a corresponding nut to be tested according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of the first positioning holes of the middle nut plate according to the present invention;

FIG. 13 is a bottom view of the nut plate of the present invention;

fig. 14 is a schematic view of a nut to be tested according to an embodiment of the present invention;

fig. 15 is a corresponding perspective view of an embodiment of a lead screw nut moment of resistance testing device according to the present invention;

FIG. 16 is a perspective view of the injection molded splint of FIG. 15;

fig. 17 is a schematic view illustrating the assembly of the injection mold clamping plate and the nut to be tested in the second embodiment.

In the figure, 1, an upper cover plate, 2, a bottom plate, 201, a first counter bore, 202, a second counter bore, 3, a torque meter fixing mechanism, 301, a first positioning plate, 3011, a guide hole, 3012, a first threaded hole, 3013, a fourth threaded hole, 302, a second positioning plate, 3021, a first counter bore, 303, a linear bearing, 304, a positioning ring, 4, a nut rotating mechanism, 401, a nut plate, 4011, a first through hole, 4012, a first positioning hole, 4013, a first boss, 4014, a second boss, 402, a fixing pin, 403, a bearing, 404, a copper shaft clamping plate, 4041, a third positioning hole, 4042, a second threaded hole, 5, a torque meter, 6, a lead screw, 7, a nut to be tested, 701, a second positioning hole, 8, a guide shaft, 801, a third threaded hole, 9, a bayonet, 10, a second counter bore, 11, and a second through hole.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

Example one

As shown in fig. 1 to 13, a resistance moment testing device for a lead screw nut is mainly used for a resistance moment test of a nut with a positioning hole, such as the nut shown in fig. 11, in the present embodiment, the positioning hole on the nut 7 to be tested is a second positioning hole 701.

The screw nut resisting moment testing device comprises an upper cover plate 1, a bottom plate 2, a torque meter fixing mechanism 3, a nut rotating mechanism 4, a torque meter 5, a screw 6, a nut 7 to be tested and a plurality of guide shafts 8 which are respectively fixed with the upper cover plate 1 and the bottom plate 2; the torquemeter fixing mechanism 3 is sleeved outside the guide shaft 8 and adjustably fixed on the guide shaft 8, and the nut rotating mechanism 4 is rotationally connected with the bottom plate 2; the torquemeter 5 is fixed on the periphery of the screw rod 6, the nut 7 to be tested is in threaded fit with the screw rod 6, the torquemeter fixing mechanism 3 is used for fixing the torquemeter 5, the nut rotating mechanism 4 is circumferentially fixed with the nut 7 to be tested, and the rotating center of the nut rotating mechanism 4 is coaxial with the screw rod 6.

Upper cover plate 1 and bottom plate 2 are fixed to the upper and lower both ends of guiding axle 8, guarantee that guiding axle 8 is in vertical state, and torque meter fixing mechanism 3 makes torque meter fixing mechanism 3 be in the horizontality through shaft hole complex mode for cup jointing the relation with guiding axle 8 to guarantee to be in the horizontality with torque meter fixing mechanism 3 fixed connection's torque meter 5. The nut rotating mechanism 4 and the to-be-tested nut 7 are circumferentially fixed, acting force of manual rotation can be transferred to the nut rotating mechanism 4, the to-be-tested nut 7 is driven to rotate through the nut rotating mechanism 4, the rotating center of the nut rotating mechanism 4 is coaxial with the screw rod 6, when the nut rotating mechanism 4 drives the to-be-tested nut 7 to rotate, the to-be-tested nut 7 only needs to be subjected to tangential force, and the problem that the to-be-tested nut 7 can be subjected to radial force when the to-be-tested nut 7 is manually rotated is solved.

In order to ensure the level of the torque meter fixing mechanism 3, at least two guide shafts 8 are preferably arranged, in the embodiment, two guide shafts 8 are symmetrically arranged, and the screw rod 6 is positioned between the two guide shafts 8.

The axial both ends of guiding axle 8 all are equipped with third screw hole 801, all are equipped with on upper cover plate 1 and the bottom plate 2 with guiding axle 8 locking complex second counter sink 10. As shown in fig. 3, the upper cover plate 1 is provided with two second counter bores 10 for receiving socket head cap screws (the head of the screw is placed in the second counter bore 10, and the screw thread portion of the screw is screwed into the third screw hole 801 of the guide shaft 8 through the second counter bore 10) and connected with the guide shaft 8, and the upper cover plate 1 is provided with a second through hole 11 (used as an extension of the torque meter 5) in the middle for reading the torque meter 5. Similarly, as shown in fig. 10, two second countersunk holes 10 are formed at both sides of the bottom plate 2 for receiving the guide shaft 8, and a second through hole 11 is formed at the center for passing through the screw rod 6.

The torque meter fixing mechanism 3 may adopt, but is not limited to, the following structure: the positioning device comprises a first positioning plate 301 and a second positioning plate 302 which are detachably fixed, wherein guide holes 3011 for a guide shaft 8 to pass through are formed in the first positioning plate 301 and/or the second positioning plate 302, namely two guide holes 3011 can be formed in the first positioning plate 301 or the second positioning plate 302, or one guide hole 3011 is formed in each of the first positioning plate 301 and the second positioning plate 302; the edges of the first positioning plate 301 and the second positioning plate 302 are both provided with bayonets 9 matched with the outer surface of the torquer 5, and the bayonets 9 of the first positioning plate 301 and the second positioning plate 302 are mutually butted to form through holes tightly matched with the periphery of the torquer 5.

This embodiment is two with torque meter fixed establishment 3 cutting in the through hole department of installation torque meter 5, be convenient for install torque meter 5, for guaranteeing torque meter fixed establishment 3's levelness, first locating plate 301 is different with second locating plate 302 structure in this embodiment, as shown in fig. 6 and 7, two guiding holes 3011 all set up on first locating plate 301, first locating

plate

301 and 8 installation of guiding axle are fixed after, put torque meter 5 in bayonet 9 departments of first locating plate 301, merge second locating plate 302 and first locating plate 301 fixedly again. Two first threaded holes 3012 may be provided on the first positioning plate 301, first countersunk holes 3021 corresponding to the first threaded holes 3012 one to one are provided on the surface of the second positioning plate 302, and screws pass through the first countersunk holes 3021 and are locked with the corresponding first threaded holes 3012, so that the first positioning plate 301 and the second positioning plate 302 are fixed.

The first positioning plate 301 can move up and down along the guide shaft 8 before being fixed with the guide shaft 8, so as to adapt to the lengths of different lead screws 6, so that the torquemeter 5 can be in a horizontal state when testing lead screws 6 with different lengths, the gravity borne by the nut 7 to be tested is completely parallel to the lead screws 6, radial component force cannot be generated, the nut 7 to be tested only bears tangential force, and the testing precision is improved. In order to reduce the sliding friction force, in this embodiment, the positioning plate is matched with the guide shaft 8 through the linear bearing 303, the linear bearing 303 is fixed in the guide hole 3011, the guide shaft 8 passes through the linear bearing 303, and the positioning ring 304 is further sleeved outside the guide shaft 8 and below the first positioning plate 301. After the height position of the first positioning plate 301 is adjusted, the positioning ring 304 is fixed to the guide shaft 8, and the positioning ring 304 can prevent the first positioning plate 301 from sliding downwards. As shown in fig. 5 and 6, the first positioning plate 301 has a guide hole 3011 and two fourth screw holes 3013 on both sides thereof for fixing the linear bearing 303 so as to be connected to the guide shaft 8 for linear movement. The guide shaft 8 is connected with the first positioning plate 301 through the linear bearing 303, so that the first positioning plate 301 can be horizontally placed in a vertically moving mode, the fixing ring is sleeved in the guide shaft 8, and the position of the first positioning plate 301 is fixed to adapt to different lengths of the screw rod 6.

The nut rotating mechanism 4 may adopt, but is not limited to, the following structure: as shown in fig. 8, the nut plate comprises a nut plate 401 and fixing pins 402, the nut plate 401 is rotatably connected with the base plate 2, a first through hole 4011 for the lead screw 6 to pass through and a plurality of first positioning holes 40112 for the fixing pins 402 to insert are arranged on the surface of the nut plate 401; the first positioning hole 40112 corresponds to the second positioning hole 701 on the surface of the nut 7 to be measured. The external dimension of the fixing pin 402 is the same as the dimension of the first positioning hole 40112, the lower end of the fixing pin 402 is fixedly connected to the nut plate 401 (the fixing pin 402 and the first positioning hole 40112 are in transition fit, that is, the distance between the fixing pin 402 and the first positioning hole 40112 is small, so that the fixing pin 402 can still be disengaged, and the fixing pin 402 does not shake when the nut plate 401 rotates), and the position of the first positioning hole 40112 corresponds to the position of the second positioning hole 701. The upper end of the fixing pin 402 passes through the second positioning hole 701, and the nut plate 401 is rotated to drive the nut 7 to be tested to rotate. Preferably, the first positioning holes 40112 are provided in two groups, and each group 40112 is composed of three first positioning holes 40112 arranged in a circumferential array (as shown in fig. 12). For cooperation with nuts 7 to be tested of different sizes.

The rotary connection structure of the nut plate 401 and the base plate 2: as shown in fig. 9, 10 and 13, the base plate 2 is matched with the nut plate 401 through a bearing 403, the upper surface of the base plate 2 is coaxially provided with a first counter bore 201 and a second counter bore 202 from top to bottom in sequence, the first counter bore 201 is matched with the periphery of the bearing 403, and the inner bottom surface of the second counter bore 202 is abutted to the outer ring of the bearing 403; the lower surface of the nut plate 401 is coaxially provided with a first boss 4013 and a second boss 4014 in order, the first boss 4013 is fitted to the inner periphery of the bearing 403, and the end surface of the second boss 4014 abuts against the inner ring of the bearing 403.

Those skilled in the art should understand that the position dimensions of the first positioning holes 40112 on the nut plate 401 correspond to the dimensions of the second positioning holes 701 one to one, but the inner diameters of the nuts 7 to be tested are different, which results in different diameters of the lead screw 6, so that the dimensions of the first through holes 4011 on the nut plate 401 need to be changed when facing different nuts 7 to be tested, and nut plates 401 with different specifications are selected for nuts 7 to be tested with different dimensions.

Example two

As shown in fig. 15-17, a lead screw nut moment resistance testing device is mainly used for testing moment resistance of an injection molding copper shaft, the injection molding copper shaft is a nut 7 to be tested (as shown in fig. 14), the injection molding copper shaft has no positioning hole, and therefore, a fixing pin 402 cannot pass through the injection molding copper shaft, which is different from the nut rotating mechanism 4 in the first embodiment, a copper shaft clamping plate 404 is added to the nut rotating mechanism 4 in the first embodiment, the copper shaft clamping plate 404 is sleeved outside the nut 7 to be tested, a third positioning hole 4041 corresponding to the first positioning hole 40112 is arranged on the outer edge of the copper shaft clamping plate 404, a second threaded hole 4042 is arranged on the circumferential outer surface of the copper shaft clamping plate 404, one end of the fixing pin 402 is fixed in the first positioning hole 40112, the other end of the fixing pin passes through the third positioning hole 4041, so as to circumferentially position the copper shaft clamping plate 404, and the copper shaft clamping plate 404 and the injection molding copper shaft are locked by using a screw after the position adjustment of the copper shaft clamping plate 404 is completed.

When the nut 7 to be tested (the copper shaft is molded by injection) is tested, the copper shaft clamping plate 404 is fixed at the end part of the copper shaft to be molded, the fixing pin 402 is fixed in the first positioning hole 40112 of the nut plate 401 after penetrating through the third positioning hole 4041 on the end surface of the copper shaft clamping plate 404, the nut plate 401 is rotated to enable the fixing pin 402 to drive the copper shaft clamping plate 404 to drive the copper shaft to be molded by injection to rotate, and the reading of the torquemeter 5 is read.

To the outer nut that drives of not unidimensional, the copper axle of moulding plastics and lead screw 6, all can realize the test through the quick change accessory for the test is more simple and convenient, and is more swift, more extensive.

In the description of the present invention, it is to be understood that the terms "central," "upper," "lower," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the orientation or positional relationship indicated in the drawings for convenience and simplicity of description, and are not intended to indicate or imply that the device or element so indicated must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description, schematic representations of the terms do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a feed screw nut moment of resistance testing arrangement which characterized in that: the device comprises an upper cover plate (1), a bottom plate (2), a torquemeter fixing mechanism (3), a nut rotating mechanism (4), a torquemeter (5), a screw rod (6), a nut (7) to be tested and a plurality of guide shafts (8) which are respectively fixed with the upper cover plate (1) and the bottom plate (2); the torquemeter fixing mechanism (3) is sleeved outside the guide shaft (8) and adjustably fixed on the guide shaft (8), and the nut rotating mechanism (4) is rotationally connected with the bottom plate (2);

the torquemeter (5) is fixed on the periphery of the screw rod (6), the nut (7) to be tested is in threaded fit with the screw rod (6), the torquemeter fixing mechanism (3) is used for fixing the torquemeter (5), the nut rotating mechanism (4) is circumferentially fixed with the nut (7) to be tested, and the rotating center of the nut rotating mechanism (4) is coaxial with the screw rod (6).

2. The feed screw nut moment of resistance testing device of claim 1, characterized in that: the torque meter fixing mechanism (3) comprises a first positioning plate (301) and a second positioning plate (302) which are detachably fixed, and a guide hole (3011) for a guide shaft (8) to pass through is formed in the first positioning plate (301) and/or the second positioning plate (302); the edges of the first positioning plate (301) and the second positioning plate (302) are provided with bayonets (9) matched with the outer surface of the torquemeter (5), and the bayonets (9) of the first positioning plate (301) and the second positioning plate (302) are mutually butted to form through holes tightly matched with the periphery of the torquemeter (5).

3. The feed screw nut moment of resistance testing device of claim 2, characterized in that: the guide holes (3011) are located on the first positioning plate (301), at least two first threaded holes (3012) are formed in the first positioning plate (301), first counter bores (3021) corresponding to the first threaded holes (3012) in one-to-one mode are formed in the surface of the second positioning plate (302), and screws penetrate through the first counter bores (3021) and are locked with the corresponding first threaded holes (3012).

4. The feed screw nut moment of resistance testing device of claim 1, characterized in that: the nut rotating mechanism (4) comprises a nut plate (401) and a fixing pin (402), the nut plate (401) is rotatably connected with the base plate (2), a first through hole (4011) for a screw rod (6) to pass through and a plurality of first positioning holes (4012) for the fixing pin (402) to insert are formed in the surface of the nut plate (401); the first positioning hole (4012) corresponds to a second positioning hole (701) on the surface of the nut (7) to be measured.

5. The feed screw nut moment of resistance testing device of claim 4, characterized in that: the first positioning holes (4012) are provided with two groups, and each group of the first positioning holes (4012) consists of three first positioning holes (4012) arranged in a circumferential array.

6. The feed screw nut resisting torque testing device according to claim 1, wherein: the nut rotating mechanism (4) comprises a nut plate (401), a fixing pin (402) and a copper shaft clamping plate (404), the nut plate (401) is rotatably connected with the base plate (2), a first through hole (4011) for a screw rod (6) to pass through and a plurality of first positioning holes (4012) for the fixing pin (402) to insert are formed in the surface of the nut plate (401); outside nut (7) that awaits measuring were located to copper axle splint (404) cover, the outer fringe of copper axle splint (404) was equipped with third locating hole (4041) that correspond with first locating hole (4012), and the circumference surface of copper axle splint (404) is equipped with second screw hole (4042).

7. The feed screw nut resistance torque testing device according to claim 4 or 6, characterized in that: the bottom plate (2) is matched with the nut plate (401) through a bearing (403), a first counter bore (201) and a second counter bore (202) are coaxially arranged on the upper surface of the bottom plate (2) from top to bottom in sequence, the first counter bore (201) is matched with the periphery of the bearing (403), and the inner bottom surface of the second counter bore (202) is abutted to the outer ring of the bearing (403);

the lower surface of the nut plate (401) is coaxially provided with a first boss (4013) and a second boss (4014) in sequence, the first boss (4013) is matched with the inner circumference of the bearing (403), and the end face of the second boss (4014) is abutted to the inner ring of the bearing (403).

8. The feed screw nut moment of resistance testing device of claim 1, characterized in that: the axial both ends of guiding axle (8) all are equipped with third screw hole (801), all are equipped with on upper cover plate (1) and bottom plate (2) with guiding axle (8) locking complex second counter sink (10).

9. The feed screw nut moment of resistance testing arrangement of claim 3, characterized in that: all be fixed with linear bearing (303) in guiding hole (3011), guiding axle (8) pass linear bearing (303), guiding axle (8) are located the below of first locating plate (301) outward and still are equipped with holding ring (304).

10. The feed screw nut moment of resistance testing device of claim 1, characterized in that: the upper cover plate (1) and the bottom plate (2) are provided with second through holes (11) for the screw rods (6) to pass through.