CN204988228U - Screw rod detection device - Google Patents

Abstract

A screw rod detection device is used for solving the problems that the existing screw rod is poor in detection accuracy and difficult to operate. This screw rod detection device contains: a base; the clamping module is provided with a base arranged on the base, two rotating parts arranged on the base and a driving assembly, the driving assembly is connected with the two rotating parts to drive the two rotating parts to rotate, a pressing arm is pivoted on the base, a pressing wheel is rotatably connected with the pressing arm, the axial direction of the pressing wheel is parallel to the axial direction of the two rotating parts, the circumferential surface of the pressing wheel is opposite to the circumferential surfaces of the two rotating parts, and the circumferential surfaces of the two rotating parts are respectively provided with a thread part; and the measuring module is provided with a supporting seat and a measurer, the supporting seat is arranged on the base, the measurer is arranged on the supporting seat, a detecting head is telescopically connected with the measurer, and the free end part of the detecting head faces to the thread parts of the two rotating parts.

Description

Screw detection device

technical field

The utility model relates to a detection device, in particular to a screw detection device for detecting the specifications of the screw.

Background technique

Generally, when the external thread and internal thread mesh, there will be a small gap between the external diameter of the external thread and the valley diameter of the internal thread, and the internal diameter of the internal thread and the valley diameter of the external thread, and the thread surfaces should be in contact with each other. ; The mutually abutting part is the tangent point of the pitch circle of the external thread and the internal thread, which is the part where the force is actually transmitted between the threads, and defines the "pitch circle diameter" of the external thread and the internal thread, also known as "Effective path". When the effective diameters of the external thread and the internal thread are similar, the two mesh well. On the contrary, if the effective diameter difference is large, there will be a gap, resulting in poor meshing. Therefore, whether the effective diameter of the external thread and internal thread meets the specification is one of the important inspection items to check whether the threaded part is a qualified product.

For screws with external threads, the "thread ring gauge" is used for early detection of whether the effective diameter of the external threads is qualified. When testing, two thread ring gauges with internal threads should be prepared, the effective diameter of the internal thread of one thread ring gauge is the lower limit of the nominal size of the screw, and the effective diameter of the internal thread of the other thread ring gauge is the screw diameter. The upper limit of the nominal size. Accordingly, the user can detect whether the external thread of the screw rod can be screwed into the internal thread of the two-thread ring gauge. Among them, the screw that cannot be screwed into the thread ring gauge with the upper limit of the nominal thread size, and the screw that can be screwed into the thread ring gauge with the lower limit of the nominal thread size are defective; value of the thread ring gauge but cannot be screwed into the screw with the thread ring gauge of the lower limit of the nominal size of the thread, it is a good product that meets the quality control standard, that is, the effective diameter of the screw falls between the upper and lower limits of the nominal size , the screw can be screwed into a nut that conforms to the nominal size, and will not loosen after combination.

However, when detecting the effective diameter of the external thread of the screw, it is only possible to know whether the external thread of the tested screw is between the upper and lower limits of the nominal size, but it is impossible to know exactly the correct size of the effective diameter of the external thread of the screw. And, whether the center line of the external thread of the screw is coaxial with the axis of the screw, so as to ensure that the screw can form an evenly stressed tight contact when meshing with other threaded parts.

In order to solve the above problems, please refer to Fig. 1, which is a schematic diagram of measuring the effective diameter of the external thread of the screw rod S using an existing three-wire gauge 9; during operation, first measure the pitch P of the external thread of the measured screw rod S, and then Select the corresponding formula according to the thread type, and substitute the pitch P to calculate the optimal steel wire diameter d; for example, when the external thread of the tested screw S is a 60-degree V-shaped thread, the optimal steel wire diameter d is approximately equal to 0.5774 times the pitch P. Then, find out two three-wire gauges 9a, 9b that meet the value from the entire set of measuring tools according to the optimal steel wire diameter d, wherein one three-wire gauge 9a has two steel wires 91, and the other three-wire gauge 9b has one steel wire 91 . Continue to assemble the two three-wire gauges 9a, 9b onto a micrometer (not shown in the figure), then set the tested screw S between the two three-wire gauges 9a, 9b, and adjust the micrometer The three steel wires 91 are firmly abutted against the thread surface of the screw S, and then the measured value M is read. Finally, substitute the measured value M into the corresponding formula to calculate the effective diameter D of the external thread of the screw S; for example, D=M+0.866025P-3d.

However, with the help of three-wire gauge 9 and a micrometer, although the effective diameter value of the external thread of the screw S can be actually measured, the operation steps are complicated, and it is difficult for novices to learn; and there are many human judgments in the assembly or measurement process. As long as there is a slight deviation in actions such as installation, alignment, and clamping, the accuracy of the measurement results will be affected. For the screw S that requires high precision, this existing screw detection device is really difficult to apply. Moreover, the existing screw detection device still cannot know whether the external thread of the screw S has eccentricity, and the degree of eccentricity.

In view of this, the existing screw detection device really still needs to be improved.

Utility model content

The utility model provides a screw rod detection device, which can not only detect the effective diameter size of the external thread of the screw rod, but also detect the eccentricity of the external thread of the screw rod.

The utility model provides a screw rod detection device, which is not only easy to operate, but also has high detection accuracy, and can be suitable for the detection of screw rods with high precision requirements.

The screw detection device of the present utility model comprises: a base; a clamping module, the clamping module has a base on the base, and two rotating parts and a driving assembly on the base, the The drive assembly connects the two rotating parts to drive the two rotating parts to rotate. A pressing arm is pivotally connected to the base, and a pressing wheel is rotatably connected to the pressing arm. The axial direction of the pressing wheel is parallel to that of the two rotating parts. In the axial direction, the circumferential surface of the pressure roller is opposite to the circumferential surfaces of the two rotating parts, and the circumferential surfaces of the two rotating parts are respectively provided with a threaded part; and a measuring module, the measuring module has a support base and a A measuring device, the supporting seat is arranged on the base, the measuring device is arranged on the supporting seat, a detecting head is telescopically connected to the measuring device, and the free end of the detecting head faces the threaded part of the two rotating parts.

Wherein, the threaded portion of the two rotating parts and the free end portion of the detection head conform to the thread specification of the external thread of the screw rod to be detected. Also, the free end of the detection head can be in the form of a single thread.

Wherein, the measuring device may include an outer tube, a telescopic rod and a display element, the telescopic rod penetrates inside the outer tube, one end of the telescopic rod protrudes through the outer tube and is provided with a positioning part, the The detection head is combined with the positioning part; the display element is connected to the outer tube, the display element has a display part and a telescopic part, the display part is exposed outside the outer tube, and the telescopic part penetrates the inside of the outer tube and It is abutted by the other end of the telescopic rod.

Wherein, one end of the outer tube is provided with a joint part and a cover body, and the cover body is detachably combined with the joint part.

Wherein, a perforation axially passes through the cover body, the display element has a locking part, one end of the locking part is connected to the display part, and the telescopic member protrudes telescopically through the other end of the locking part. The locking part is connected and positioned at the through hole.

Wherein, the interior of the outer tube forms a shoulder with the inner diameter difference between the two ends, and the interior of the outer tube is divided into a large-diameter area and a small-diameter area according to the shoulder, and the large-diameter area is closer to the cover than the small-diameter area body; the telescopic rod has a connecting rod, a stop portion and a stop rod, the stop part is connected between the connection rod and the stop rod, and the diameter width of the stop part is larger than the connection rod and the stop rod The diameter of the connecting rod is wide, the positioning part is set at the end of the connecting rod away from the stop part; the connecting rod penetrates through the small diameter area, and a part of the connecting rod protrudes through the outer tube, so that the positioning part is exposed on the Outside the outer tube, the resisting rod extends through the large-diameter area, and the end of the resisting rod away from the abutting part abuts against the telescopic part of the display element.

Wherein, the measurer is provided with an elastic piece, the elastic piece is sheathed on the outer periphery of the resisting rod, one end of the elastic piece abuts against the stop portion of the telescopic rod, and the other end abuts against the cover.

Wherein, the measurer of the measuring module is arranged on the supporting base in a height-adjustable manner.

Wherein, the base may have a setting surface, and the clamping module and the measuring module are directly or indirectly assembled and positioned on the setting surface. In addition, a translation component may be provided on the installation surface, and the base of the clamping module or the support seat of the measurement module is assembled and positioned on the translation component.

Wherein, the two ends of the pressing arm are respectively a coupling end and a pressing end, the pressing wheel is rotatably arranged at the coupling end of the pressing arm, and a pivot joint may be provided between the coupling end and the pressing end of the pressing arm , the pressing arm is pivotally connected to the base by the pivot portion. Moreover, the clamping module may have a reset element, the reset element is arranged in the base, one end of the reset element abuts against the lower part of the pressing arm, and the reset element is located at the pivot joint and the pressing end of the pressing arm. between.

Wherein, the driving assembly may have a rotating disc and two linkages, the rotating disc is rotatably connected to the base, one of the linkages is connected to the rotating disc and one end of one of the rotating members, and the other linkage is connected to the base. One end of the rotating disc and another rotating member.

Accordingly, the screw detection device of the present invention can not only be used to detect the effective diameter size of the external thread of the screw, but also can detect the eccentricity of the screw shaft. Furthermore, the screw detection device of the present invention is not only easy to operate, but also reduces human judgment error factors during the detection process, and can improve detection accuracy, so it is suitable for screw detection with high precision requirements.

Description of drawings

Figure 1: A schematic diagram of measuring the effective diameter of the external thread of a screw using an existing three-wire gauge.

Fig. 2: A schematic diagram of a three-dimensional structure of an embodiment of the utility model.

Fig. 3: A schematic diagram of a three-dimensional exploded structure of the measuring device used in the present invention.

Figure 4: A schematic diagram of the implementation of an embodiment of the present invention when it is inserted into a standard screw.

Figure 5: This utility model uses two rotating parts for the engagement of the standard screw, and the side view structural diagram when the pressure roller touches the standard screw.

Figure 6: A schematic diagram of the side view structure of the utility model when the detection head abuts against the standard screw.

Fig. 7: A schematic diagram of implementation of an embodiment of the present invention when the screw rod to be tested is placed.

Fig. 8: A schematic diagram of the side section structure of the measuring device when the detection head of the utility model abuts against the screw rod to be detected.

Figure 9: Schematic diagram of a partially enlarged structure of Figure 8.

[Description of main component symbols]

﹝This utility model﹞

1 base 11 setting surface

12 translation components

2 clamping module 21 base

22 rotating part 221 threaded part

23 drive components

231 rotating disk 232 linkage

24 Press arm 24a joint end

24b Press end 241 pivot joint

25 pressure roller 26 reset element

3 measurement module 31 support seat

32 measurer 321 outer tube

3211 Joint 3212 Cover

3213 shoulder 3214 large diameter area

3215 Trail District 3216 Perforation

322 telescopic rod 3221 positioning part

3222 connecting rod 3223 stop part

3224 Arrest rod 323 display element

3231 Display part 3232 Telescopic part

3233 locking part 324 elastic piece

A standard screw H detection head

S screw

﹝current technology﹞

9, 9a, 9b three-wire gauge 91 steel wire

d Steel wire diameter D Effective diameter

M measured value P pitch

S screw.

detailed description

In order to make the above-mentioned and other purposes, features and advantages of the present utility model more obvious and understandable, the preferred embodiments of the present utility model are specially cited below, together with the accompanying drawings, to be described in detail as follows:

Please refer to Fig. 2, which is an embodiment of the screw detection device of the present invention, the screw detection device generally includes a base 1, a clamping module 2 and a measuring module 3, the clamping module 2 and the measuring module 3 Set on the base 1.

The shape of the base 1 is not limited, and the principle is that it can carry components such as the clamping module 2 and the measuring module 3 . The base 1 has a setting surface 11 for the clamping module 2 and the measuring module 3 to be assembled and positioned directly or indirectly. Moreover, a translation assembly 12 can be provided on the installation surface 11 of the base 1, and the translation assembly 12 can be assembled and positioned by the clamping module 2 or the measurement module 3, so that by adjusting the translation assembly 12, the clamping module 2 can be changed. The distance or relative position with the measurement module 3 is suitable for different measurement requirements. For example, the translation component 12 can be a stacked slide rail and slider structure, or as shown in the figure, long holes in different directions are provided on a plate, and locking elements are used to adjust the clamping The distance or relative position between the module 2 and the measurement module 3 .

Referring to FIGS. 2 and 4 , the clamping module 2 has a base 21 disposed on the base 1 , and the base 21 can be assembled and positioned on the installation surface 11 of the base 1 or the translation component 12 . The clamping module 2 further includes two rotating parts 22 disposed on the base 21 and a driving assembly 23 connected to the two rotating parts 22 to drive the two rotating parts 22 to rotate. In this embodiment, the axial directions of the two rotating parts 22 are parallel, and the two rotating parts 22 are erected on the base 21 at intervals; A threaded portion 221 is provided at the position, and the thread specification of the threaded portion 221 conforms to the thread specification of the external thread of the screw S to be detected, so that the screw S can engage with the two rotating parts 22 .

The drive assembly 23 then includes a rotating disk 231 and two linkages 232, the rotation disk 231 is rotatably connected to the base 21, the two linkages 232 can be, for example, belts or chains; one of the linkages 232 is connected The rotating disk 231 and one end of one rotating member 22 , and the other linking member 232 connects the rotating disk 231 and one end of the other rotating member 22 . Accordingly, the user can rotate the rotating disk 231 by manipulating the rotating disc 231, and then the two rotating parts 22 are linked by the two connecting parts 232 to rotate in the same direction at the same time, so that the screw S engaged with the two rotating parts 22 can generate rotation and axial displacement.

The clamping module 2 also includes a pressing arm 24 and a pressing wheel 25, the pressing arm 24 is pivotally connected to the base 21, the pressing wheel 25 is rotatably connected to the pressing arm 24, and the axial direction of the pressing wheel 25 is parallel to In the axial direction of the two rotating parts 22, and the circumferential surface of the pressure wheel 25 is opposite to the circumferential surface of the two rotating parts 22, so that the screw S engaged with the two rotating parts 22 is supported by the pressing wheel 25 , to ensure that the screw S will not fall off from the two rotating parts 22. Specifically, the two ends of the pressing arm 24 are respectively a joint end 24a and a pressing end 24b. The pressing wheel 25 is rotatably arranged on the joint end 24a of the pressing arm 24. A pivot portion 241 is further provided between the ends 24b, and the pressing arm 24 is pivotally connected to the base 21 by the pivot portion 241 .

Moreover, in order to improve the convenience of operation, the clamping module 2 of this embodiment can be further provided with a reset element 26, the reset element 26 is arranged in the base 21, and one end of the reset element 26 abuts against the pressing arm 24 , and the reset element 26 is located between the pivoting portion 241 of the pressing arm 24 and the pressing end 24b. Accordingly, when the user presses the pressing end 24b of the pressing arm 24, the pressing arm 24 pivots relative to the base 21, so that the joint end 24a of the pressing arm 24 is relatively tilted (as shown in FIG. 4 ). , at the same time, the reset element 26 can be compressed to produce elastic deformation; and when the user releases the pressing arm 24, the reset element 26 can be elastically reset, and then push against the pressing arm 24 to pivot in reverse, so that the pressing Both ends of the arm 24 automatically return to their original positions when not pressed.

The measurement module 3 is arranged on the base 1, the measurement module 3 has a support base 31 and a measuring device 32, the support base 31 can be assembled and positioned on the setting surface 11 or the translation assembly 12 of the base 1, the measuring device 32 is assembled and positioned on the support seat 31, a detection head H is telescopically connected to the measuring device 32, so that the displacement of the detection head H is measured by the measuring device 32; the free end of the detection head H faces the two The threaded portion 221 of the rotating member 22 .

Please refer to FIGS. 3 and 8 , the measuring device 32 includes an outer tube 321 , a telescopic rod 322 and a display element 323 . The telescopic rod 322 can axially displace and extend inside the outer tube 321, one end of the telescopic rod 322 protrudes through the outer tube 321 and is provided with a positioning part 3221, the detection head H is combined with the positioning part 3221 . The display element 323 is connected to the outer tube 321, the display element 323 has a display part 3231 and a telescopic part 3232, the display part 3231 is exposed outside the outer tube 321, and the telescopic part 3232 extends inside the outer tube 321 And it is abutted by the other end of the telescopic rod 322 . Accordingly, when the detection head H is pushed, the telescopic rod 322 can synchronously move the telescopic member 3232 , so that the display part 3231 displays the displacement of the detection head H.

In this embodiment, one end of the outer tube 321 is provided with a joint portion 3211 and a cover 3212, and a shoulder 3213 is formed inside the outer tube 321 with a difference in inner diameter between the two ends, and the outer tube 321 The interior is divided into a large-diameter area 3214 and a small-diameter area 3215 according to the shoulder 3211 , and the large-diameter area 3214 is closer to the cover body 3212 than the small-diameter area 3215 . A through hole 3216 axially passes through the cover body 3212 , and the through hole 3216 communicates with the large diameter area 3214 inside the outer tube 321 . The display element 323 also has a latching portion 3233, one end of the latching portion 3233 is connected to the display portion 3231, and the telescopic member 3232 protrudes telescopically through the other end of the latching portion 3233, and the latching portion 3233 Connections are located at the perforations 3212 .

The telescopic rod 322 has a connecting rod 3222, a stop portion 3223 and a stop rod 3224, the stop part 3223 is connected between the connection rod 3222 and the stop rod 3224, and the diameter width of the stop part 3223 is larger than the Diameters of the connecting rod 3222 and the resisting rod 3224 are wide, and the positioning portion 3221 is disposed at an end of the connecting rod 3222 away from the resisting portion 3223 . The connecting rod 3222 passes through the small-diameter area 3215 inside the outer tube 321, and a part of the connecting rod 3222 protrudes through the outer tube 321, so that the positioning part 3221 is exposed outside the outer tube 321, and the resisting rod 3224 Then, the large-diameter area 3214 inside the outer tube 321 is extended, and the end of the resisting rod 3224 away from the resisting portion 3223 abuts against the telescopic member 3232 of the display element 323 .

The measurer 32 can further include an elastic member 324, which is sheathed on the outer periphery of the resisting rod 3224. One end of the elastic member 324 abuts against the abutting portion 3223 of the telescopic rod 322, and the other end abuts against The cover body 3212 abuts against the shoulder 3213 of the outer tube 321 by the elastic member 324 pushing the abutting portion 3223 .

According to the aforementioned structure, the utility model can be used to detect the effective diameter size of the external thread of the screw rod S, and detect the axial eccentricity of the screw rod S; the screw rod detection method includes the following steps:

Please refer to Fig. 4, according to the screw tooth specification of the screw rod S to be tested, select a standard screw A and a screw detection device, and the screw detection device has two rotating parts 22 and a measuring device 32 that meet the screw specification. The detection head H. Wherein, the free end of the detection head H can be in the form of a single thread or multiple threads, based on the principle of being able to mesh with the standard screw A of the corresponding thread specification; It is in the form of a single thread, which can detect each thread of the screw S under test one by one, and has better measurement accuracy.

Then, the user can press the pressing arm 24 of the clamping module 2 to make the pressing arm 24 pivot, so that the joint end 24a is relatively tilted, so as to insert the standard screw A into the pressing wheel 25 and the two rotating parts. Between 22, make this standard screw rod A engage with these two rotating parts 22.

Referring to FIG. 5 , the pressing arm 24 is continuously released, and the two ends of the pressing arm 24 are automatically returned to the initial position when not being pressed by the reset element 26 . At this time, the external thread of the standard screw A is engaged with the two rotating parts 22 , and the crest of the external thread of the standard screw A is firmly abutted against by the circumferential surface of the pressure roller 25 .

Please refer to Figures 6 and 8, adjust the position of the measuring device 32 so that the free end of the detection head H can extend into the external thread gap of the standard screw A until the free end of the detection head H abuts telescopically The thread surface of the standard screw A, and the value displayed on the display part 3231 of the display element 323 is reset to zero.

Next, as shown in FIG. 5, adjust the position of the measuring device 32 so that the measuring device 32 is displaced upward by a preset distance relative to the support base 31. As shown in FIG. 7, press the clamping module 2 again. Press the arm 24 to pivot the pressing arm 24 so that the joint end 24a is relatively tilted to remove the standard screw A, and then insert the screw S to be detected between the pressing wheel 25 and the two rotating parts 22 During this time, the screw S is engaged with the two rotating members 22, and then the measurer 32 is displaced downward relative to the support base 31 by the aforementioned preset distance, and the measurement displayed on the display part 3231 of the display element 323 is read. value.

That is, please refer to FIG. 9, the measured value displayed on the display unit 3231 is the effective diameter difference between the external thread of the screw S and the standard screw A (marked in FIG. 6), and the user only needs to interpret the effective diameter difference Whether it is within the tolerance range, the effective diameter of the external thread of the screw S can be detected, and based on this, it can be judged whether the effective diameter of the external thread of the screw S is a qualified product.

Please refer to Figures 2 and 9 again, the user can rotate the rotating disc 231 by manipulating the rotating disc 231, and then the two rotating parts 22 are linked by the two moving parts 232 to rotate in the same direction at the same time, so that the pressure roller 25 and the screw rod S also rotates synchronously, and the telescopic displacement state of the detection head H is detected by the measuring device 32 to measure the axial eccentricity of the screw S.

Specifically, if the axis of the screw S has no eccentricity, then the distance between the detection head H and the axis of the screw S should remain unchanged during the rotation of the screw S, so the display part of the display element 323 The measured value displayed by the 3231 should also remain unchanged. In contrast, if the axis of the screw S is eccentric, the distance from the detection head H to the axis of the screw S changes during the rotation of the screw S, and the elastic member 324 of the measuring device 32 pushes against The telescopic rod 322 keeps the detection head H in contact with the helical surface of the screw S, so the measured value displayed on the display part 3231 of the display element 323 will change, and the screw can be obtained by converting the changed difference. S axis eccentricity.

To sum up, the screw detection device of the present invention can not only detect the effective diameter of the external thread of the screw, but also detect the axis eccentricity of the external thread of the screw. Accordingly, the utility model can achieve the following advantages:

1. In the process of continuous manufacturing of a large number of screws, it can be randomly sampled and tested at any time to directly know whether there is a problem with the operation of the tapping machine, and whether it has reached the time to repair the problem immediately (for example, the tapping machine used for screw tapping) Whether the tapping tool is worn out enough to need to be replaced, or whether the deflection of the tapping tool is still within the allowable range, etc.), will help improve the yield of the product.

2. Since the utility model can accurately know the measured value of the screw rod, when the deflection of the tapping machine driven by the tapping tool can no longer be adjusted to the ideal value, the measured value can be used for calculation, so as to Quickly select a suitable one among multiple tapping tools, so that a screw rod with a qualified size can be processed by the suitable tapping tool.

3. The utility model can simply and quickly detect whether the deformation of heat treatment or the thickness of electroplating film is ideal by measuring the screw before and after heat treatment or electroplating.

Therefore, in addition to the standard inspection of the finished screw, the utility model can also sample and inspect the semi-finished products before and after specific processing steps at any time during the entire screw manufacturing process, and digitize the detection results, which can help quickly eliminate defects in the manufacturing process. problem, very practical.

Furthermore, the screw detection device of the present invention is not only easy to operate, but also reduces the factors of human judgment error in the detection process, which can improve the detection accuracy, so it can be applied to the screw detection with high precision requirements.

Claims (14)

1. a screw rod pick-up unit, is characterized in that, it comprises:

A base;

A self-clamping module, this self-clamping module has the pedestal be located on this base, and two revolving parts be located on this pedestal and a driven unit, this driven unit connects this two revolving parts, rotate to drive these two revolving parts, a press arm is articulated in this pedestal, a pinch roller rotatably connects this press arm, the axis being axially parallel to these two revolving parts of this pinch roller, the ring side face of this pinch roller is relative with the ring side face of these two revolving parts, and the ring side face of these two revolving parts is respectively equipped with a threaded portion; And

A measurement module, this measurement module has a supporting seat and a measuring appliance, and this supporting seat is located on this base, and this measuring appliance is located on this supporting seat, a detection head telescopically connects this measuring appliance, and the free end of this detection head is towards the threaded portion of these two revolving parts.

2. screw rod pick-up unit as claimed in claim 1, is characterized in that: the threaded portion of these two revolving parts and the free end of this detection head meet the externally threaded thread specification of institute for the screw rod of detection.

3. screw rod pick-up unit as claimed in claim 2, is characterized in that: the free end of this detection head is the kenel of single thread.

4. screw rod pick-up unit as claimed in claim 1, it is characterized in that: this measuring appliance comprises an outer tube, an extension stem and a display element, this extension stem is extended through the inside of this outer tube, one end of this extension stem protrudes out and passes this outer tube and be provided with a location division, and this detection head is combined in this location division; This display element connects this outer tube, and this display element has a display part and an extensible member, and this display part is exposed outside this outer tube, and this extensible member is extended through the inside of this outer tube and is abutted by the other end of this extension stem.

5. screw rod pick-up unit as claimed in claim 4, is characterized in that: one end of this outer tube is provided with a joint portion and a lid, and this lid is removably incorporated into this joint portion.

6. screw rod pick-up unit as claimed in claim 5, it is characterized in that: a perforation axially runs through this lid, this display element has a blocking part, one end of this blocking part connects this display part, this extensible member telescopically protrudes out the other end passing this blocking part, and the connection of this blocking part is positioned this perforation.

7. screw rod pick-up unit as claimed in claim 5, it is characterized in that: the inside of this outer tube forms a shoulder with difference in internal diameters between two ends, the inside of this outer tube is divided into a Ge great Jing district and a path district according to this shoulder, and this great Jing district is this path district this lid contiguous comparatively; This extension stem has a pitman, a stop section and a support rod, this stop section is connected between this pitman and this support rod, the footpath that the footpath of this stop section is wider than this pitman and this support rod is wide, and this pitman one end away from this stop section is located in this location division; This pitman is stretched through this path district, and the local of this pitman protrudes out and passes this outer tube, and make this location division exposed outside this outer tube, this support rod is extended through this great Jing district, and this support rod abuts the extensible member of this display element away from one end of this stop section.

8. screw rod pick-up unit as claimed in claim 7, it is characterized in that: this measuring appliance is provided with an elastic component, and this elastic component is set in the periphery of this support rod, one end of this elastic component abuts the stop section of this extension stem, and the other end abuts this lid.

9. the screw rod pick-up unit according to any one of claim 1 to 8, is characterized in that: the measuring appliance of this measurement module is located in adjustable height on this supporting seat.

10. the screw rod pick-up unit according to any one of claim 1 to 8, is characterized in that: this base has an installation surface, and this self-clamping module and this measurement module are assembled directly or indirectly and be positioned this installation surface.

11. screw rod pick-up units as claimed in claim 10, is characterized in that: this installation surface is provided with a translation assembly, and the supporting seat assembling of the pedestal of this self-clamping module or this measurement module is positioned this translation assembly.

12. screw rod pick-up units according to any one of claim 1 to 8, it is characterized in that: two ends of this press arm are respectively a binding end and a press-side, this pinch roller is rotatably located at the binding end of this press arm, be provided with an articulated section between the binding end of this press arm and press-side, this press arm is by this this pedestal of articulated section pivot joint.

13. screw rod pick-up units as claimed in claim 12, it is characterized in that: this self-clamping module has a reposition element, this reposition element is located in this pedestal, and one end of this reposition element is connected to the below of this press arm, and this reposition element is between the articulated section and press-side of this press arm.

14. screw rod pick-up units according to any one of claim 1 to 8, it is characterized in that: this driven unit has a rolling disc and two moving parts, this rolling disc rotatably connects this pedestal, one of them moving part connects one end of this rolling disc and one of them revolving part, and another moving part connects one end of this rolling disc and another revolving part.