Device for measuring fixed length of pipe blank in centralized manner

Abstract

The utility model discloses a device for measuring the fixed length of a pipe blank in a centralized manner, and belongs to the technical field of pipe blank measurement. The device comprises four first supports, two second supports, two third supports, a fourth support, a fifth support, six measuring rods, eighty screws, eight linear bearings, four wheels and four hinges, and can achieve the purpose of measuring the fixed lengths of three pipe blanks at the same time. And the device has the characteristics of low manufacturing cost, simplicity in operation and good use effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of tube blank measurement, and in particular relates to a device for centrally measuring the fixed length of tube blanks. Background Art

[0002] At present, seamless steel pipes are usually made by hot rolling piercing + continuous pipe rolling + tension reducing. In order to improve the yield rate, the cut length of the tube billet is accurately calculated according to the production specifications of the steel pipe. Therefore, before the tube billet enters the annular heating furnace, the cut length of the tube billet needs to be measured one by one. Since the traditional tube billet length measuring device is usually based on a measuring reference surface, the moving tube billet will inevitably impact the measuring reference surface during the process of contacting the measuring reference surface. Therefore, the traditional tube billet length measuring device is relatively harmful to the equipment. In view of this, some companies have successively developed non-contact tube billet length measuring devices and tube billet length measuring devices based on dual measuring reference surfaces, but these tube billet length measuring devices have certain limitations to a greater or lesser extent, some of which have relatively high manufacturing costs and some of which have relatively low measurement accuracy.

[0003] After searching, it was found that there are two literature patents that are most relevant to the utility model technology, and the specific contents are described as follows:

[0004] Patent document CN 112985273 A discloses a side-type non-contact round billet length measurement method and measuring device. The patented device mainly includes a conveyor roller, a roller base, a photoelectric sensor, a sensor bracket, a cable drag chain, a drag chain bracket, an encoder, a servo motor, a gear, a rack, a guide rail, a beam and a base. Since non-contact measurement is adopted, damage to the equipment can be avoided; since photoelectric sensors are used for detection, accurate measurement can be achieved, but the manufacturing cost of the patented device is relatively high.

[0005] Patent document CN 207300195 U discloses a device for measuring the length of a billet of a vertical round billet continuous casting machine. The patented device mainly includes a measuring roller, a bearing seat, a movable bracket, an encoder, a guide sleeve, a fixed base, a hydraulic cylinder, a fixed bracket, a driving roller and a flame cutter. Since the measuring rollers use the same diameter, even if the contact position of the billet deviates from the center of the roller surface, the measurement result will not have a large deviation. However, the patented device is designed based on the macro measurement of the length of the high-temperature billet and does not have the function of micro-length measurement. Therefore, the measurement accuracy of the patented device is relatively low.

[0006] Patent document CN 209570110 U discloses a device for measuring the length of a tube blank. The patented device mainly includes a supporting vertical plate, a lifting plate, a ruler, a bottom plate, a pad, a top plate, a roller, a rolling bearing and other components. Although the patented device uses a double measuring reference surface to measure the length of the tube blank, the ruler of the patented device does not have the function of length micrometry. Therefore, the measurement accuracy of the patented device is relatively low. Utility Model Content

[0007] In order to overcome one or more problems existing in the prior art, the utility model provides a device for centrally measuring the fixed length of tube blanks. The utility model device is designed with a symmetrical structure, and measures the two ends of the tube blank respectively based on two measuring reference surfaces, thereby avoiding the impact of the moving tube blank on the measuring reference surface; the combined use of the second bracket and the fourth bracket can realize the relative setting of the first bracket, and the use of screws can realize the linkage of the third bracket and the fifth bracket; the combined use of linear bearings, the fourth bracket and the screws can realize the movement of the fifth bracket according to a predetermined trajectory; the combined use of the six scale segments of the six measuring rods and the six sixth bosses of the two third brackets can form six spiral micrometers, so that the lengths of three tube blanks can be quickly measured. Therefore, the working efficiency of the utility model device is relatively high.

[0008] The technical solution adopted by the utility model to solve its technical problems is as follows.

[0009] The device for centrally measuring the fixed length of a tube blank provided by the utility model comprises: four first brackets, two second brackets, two third brackets, one fourth bracket, one fifth bracket, six measuring rods, eighty screws, eight linear bearings, four wheels and four hinges;

[0010] The first bracket is composed of a first body, a first boss and a second boss connected together, the first body, the first boss and the second boss are all rectangular parallelepiped symmetrical structures, the first boss is located at the lower end surface of the first body, and the second boss is located at the lower end surface of the first boss; the first body is symmetrically provided with four first screw holes, and the screws are screwed into the first screw holes; the first boss is provided with two rectangular parallelepiped first through holes, and the third boss of the second bracket is penetrated into the first through holes; the lower end surface of the second boss is provided with a rectangular parallelepiped groove, and the wheel is penetrated into the groove; the front and rear sides of the groove are respectively provided with a cylindrical second through hole, and the hinge is penetrated into the second through hole;

[0011] The second bracket is composed of a second body and four third bosses connected together, the second body and the third bosses are both rectangular parallelepiped symmetrical structures, and the four third bosses are divided into two groups, respectively located at the front and rear end surfaces of the second body;

[0012] The third bracket is composed of a third body, two fourth bosses, three fifth bosses and six sixth bosses, the third body, the fourth boss and the fifth boss are all rectangular parallelepiped symmetrical structures, the two fourth bosses are simultaneously located on the upper end surface of the third body, the three fifth bosses are simultaneously located on the lower end surface of the third body, and the six sixth bosses are respectively located on the front and rear six end surfaces of the three fifth bosses; a rectangular first through groove can be formed between the two fourth bosses, and the twelfth boss of the fifth bracket is penetrated in the first through groove; the fourth boss is symmetrically provided with four cylindrical third through holes, and the screw is penetrated in the third through hole; the sixth boss is a cylindrical symmetrical structure, and the side surface of the sixth boss is evenly marked with fifty grid scales along the circumferential direction; a second screw hole is provided at the axis position of the sixth boss, the measuring rod is screwed in the second screw hole, and the second screw hole also passes through the fifth boss;

[0013] The fourth bracket is composed of two sixth bodies, two ninth bosses and eight tenth bosses connected together. The sixth body, the ninth boss and the tenth boss are all rectangular symmetrical structures. The two ninth bosses are located between the two sixth bodies at the same time. The eight tenth bosses are divided into four groups and are respectively located on the four left and right end faces of the two sixth bodies; the sixth body is symmetrically provided with two cylindrical sixth through holes, and the eighth boss of the linear bearing is penetrated in the sixth through holes; four third screw holes are evenly provided around the sixth through hole, and the screws are screwed in the third screw holes; a rectangular second through groove can be formed between the two tenth bosses in each group, and the first body of the first bracket is penetrated in the second through groove; the tenth boss is symmetrically provided with four cylindrical seventh through holes, and the screws are penetrated in the seventh through holes;

[0014] The fifth bracket is composed of a seventh body, four eleventh bosses and two twelfth bosses, the seventh body and the twelfth boss are both rectangular parallelepiped symmetrical structures, the four eleventh bosses are simultaneously located on the upper end surface of the seventh body, and the two twelfth bosses are simultaneously located on the lower end surface of the seventh body; the eleventh boss is a cylindrical symmetrical structure, which is used to penetrate the fifth through hole of the linear bearing; the twelfth boss is symmetrically provided with four fourth screw holes, and the screws are screwed into the fourth screw holes;

[0015] The measuring rod is composed of four parts: a coaxial contact section, an isolation section, a threaded section and a scale section. The contact section and the isolation section are both cylindrical symmetrical structures; the threaded section is a cylindrical symmetrical structure with threads on the side, which is used to screw into the second screw hole of the third bracket, and the pitch value of the thread is 0.5mm; the scale section is a cylindrical symmetrical structure, and the side of the cylinder is evenly marked with four groups of scales along the circumferential direction, each group of scales consists of two adjacent upper and lower rows of staggered scales, the staggered value of the two rows of staggered scales is 0.5mm, and the minimum grid value of the staggered scales is 1mm.

[0016] In some embodiments, the screw is composed of a coaxial fourth body and a seventh boss, the fourth body and the seventh boss are both cylindrical symmetrical structures, and the seventh boss is located on the rear end face of the fourth body; the end of the seventh boss is provided with a thread for screwing into the first screw hole of the first bracket, the third screw hole of the fourth bracket or the fourth screw hole of the fifth bracket.

[0017] In some embodiments, the linear bearing is composed of a fifth body and an eighth boss connected together, and the eighth boss is located on the upper end surface of the fifth body; the fifth body is a rectangular symmetrical structure, and the fifth body is symmetrically provided with four cylindrical fourth through holes, and the screws are passed through the fourth through holes; the eighth boss is a cylindrical symmetrical structure, and a cylindrical fifth through hole is provided at the axial position of the eighth boss, and the eleventh boss of the fifth bracket is passed through the fifth through hole, and the fifth through hole also passes through the fifth body; a retaining frame, balls and retaining rings are also provided in the eighth boss, and a plurality of balls are evenly provided in the retaining frame, and the retaining rings are provided at both ends of the retaining frame.

[0018] In some embodiments, the wheels and the hinges are standard parts.

[0019] The beneficial effects of the utility model are as follows:

[0020] 1) The device for centralized measuring the fixed length of tube blanks provided by the utility model comprises four first brackets, two second brackets, two third brackets, one fourth bracket, one fifth bracket, six measuring rods, eighty screws, eight linear bearings, four wheels and four hinges. Since the material is common and convenient for processing and forming, the manufacturing cost of the device of the utility model is relatively low.

[0021] 2) When the device of the utility model is used, the six measuring rods are all rotated to the zero scale position, and the original distance L0 between the front and rear two measuring rods arranged coaxially is measured; the four wheels are rolled, and the fifth bracket is moved downward along the eight fifth through holes of the eight linear bearings at the same time, so that the six measuring rods can face the front and rear six end faces of the three tube blanks; the six measuring rods are screwed in respectively, and when the six contact sections of the six measuring rods all contact the front and rear six end faces of the three tube blanks, the six measuring rods are stopped from being screwed in; the screwed-in distances △1 and △2 of the six measuring rods are read respectively, and the formula L is used to calculate the distances L1 and L2 of the six measuring rods. x =L0-△1-△2, the length L of the three tube blanks can be calculated x Therefore, the operation of the device of the utility model is relatively simple.

[0022] 3) The device of the utility model is designed with a symmetrical structure, and measures the two ends of the tube blank based on two measuring reference surfaces, thereby avoiding the impact of the moving tube blank on the measuring reference surface; the combined use of the second bracket and the fourth bracket can realize the relative setting of the first bracket, and the use of screws can realize the linkage of the third bracket and the fifth bracket; the combined use of linear bearings, the fourth bracket and screws can realize the movement of the fifth bracket according to a predetermined trajectory; the combined use of the six scale segments of the six measuring rods and the six sixth bosses of the two third brackets can form six spiral micrometers, which can accurately (the measurement accuracy can reach 0.01mm) measure the fixed length of the three tube blanks. Therefore, the use effect of the device of the utility model is relatively good.

[0023] The device for centrally measuring the cut-to-length length of tube blanks provided by the utility model can achieve the purpose of measuring the cut-to-length lengths of three tube blanks at the same time. The device of the utility model has the characteristics of low manufacturing cost, simple operation and good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the main structure of the device for centrally measuring the fixed length of a tube blank of the utility model when the third support is higher than the tube blank;

[0025] Figure 2 It is a left-side structural schematic diagram of the device for centrally measuring the fixed length of a tube blank of the utility model when the third support is higher than the tube blank;

[0026] Figure 3 It is a schematic diagram of the top view of the structure of the device for centrally measuring the fixed length of a tube blank of the utility model when the third support is higher than the tube blank;

[0027] Figure 4 It is a schematic diagram of the main structure of the device for centrally measuring the fixed length of a tube blank of the utility model when the third bracket is centered on the tube blank;

[0028] Figure 5It is a left-side structural schematic diagram of the device for centrally measuring the fixed length of a tube blank of the utility model when the third bracket is centered on the tube blank;

[0029] Figure 6 It is a schematic diagram of a top view of a part of the structure of a device for centrally measuring the fixed length of a tube blank according to the utility model;

[0030] Figure 7 This is a schematic diagram of the main structure of the first bracket of the utility model;

[0031] Figure 8 It is a left-side structural schematic diagram of the first bracket and the wheel of the utility model after being assembled;

[0032] Fig. 9 It is a bottom view structural schematic diagram of the first bracket of the utility model;

[0033] Fig.10 It is a left-side structural schematic diagram of the second bracket of the utility model;

[0034] Fig.11 This is a schematic diagram of the main structure of the third bracket of the utility model;

[0035] Fig.12 It is a left-side structural schematic diagram of the third bracket of the utility model;

[0036] Fig.13 It is a schematic diagram of the top view structure of the measuring rod of the utility model;

[0037] Fig.14 It is a left-side structural schematic diagram of the screw of the utility model;

[0038] Fig.15 This is a schematic diagram of the main structure of the linear bearing of the utility model;

[0039] Fig.16 It is a schematic diagram of the top view of the linear bearing of the utility model;

[0040] Fig.17 This is a schematic diagram of the main structure of the fourth bracket of the utility model;

[0041] Fig.18 It is a left-side structural schematic diagram of the fourth bracket of the utility model;

[0042] Fig.19 It is a schematic diagram of the top view of the structure of the fourth bracket of the utility model;

[0043] Fig. 20 This is a schematic diagram of the main structure of the fifth bracket of the utility model;

[0044] Fig.21 It is a left-side structural schematic diagram of the fifth bracket of the utility model;

[0045] Fig. 22 The utility model is a schematic diagram of the working principle of the device for centrally measuring the fixed length of tube blanks.

[0046] Description of reference numerals: 1-first bracket; 101-first body; 102-first boss; 103-second boss; 104-first screw hole; 105-first through hole; 106-groove; 107-second through hole; 2-second bracket; 201-second body; 202-third boss; 3-third bracket; 301-third body; 302-fourth boss; 303-fifth boss; 304-sixth boss; 305-third through hole; 306-second screw hole; 307-first through groove; 4-measuring rod; 401-contact section; 402-isolation section; 403-threaded section; 40 4-scale segment; 5-screw; 501-fourth body; 502-seventh boss; 6-linear bearing; 601-fifth body; 602-eighth boss; 603-fourth through hole; 604-fifth through hole; 7-fourth bracket; 701-sixth body; 702-ninth boss; 703-tenth boss; 704-sixth through hole; 705-third screw hole; 706-second through groove; 707-seventh through hole; 8-fifth bracket; 801-seventh body; 802-eleventh boss; 803-twelfth boss; 804-fourth screw hole; 9-wheel; 10-hinge; 11-tube blank. DETAILED DESCRIPTION

[0047] The content of the utility model is described in detail below through examples and drawings. The examples are only used to understand the utility model, but are not intended to limit the content of the utility model.

[0048] Combination Figures 1 to 6As shown, the utility model provides a device for centrally measuring the fixed length of a tube blank, which comprises four first brackets 1, two second brackets 2, two third brackets 3, a fourth bracket 7, a fifth bracket 8, six measuring rods 4, eighty screws 5, eight linear bearings 6, four wheels 9 and four hinges 10; wherein, four first bodies 101 of four first brackets 1 are penetrated in the four second through grooves 706 of the fourth bracket 7, and are connected by thirty-two screws 5; eight third bosses 202 of two second brackets 2 are penetrated in the eight first through holes 105 of the four first brackets 1, and four grooves 106 of the four first brackets 1 are penetrated in the four second through holes 105 of the four first brackets 1. 06, four of the wheels 9 are passed through, and are hinged by four hinges 10; eight eighth bosses 602 of eight linear bearings 6 are passed through the four sixth through holes 704 of the fourth bracket 7, and are connected by thirty-two screws 5; four eleventh bosses 802 of the fifth bracket 8 are passed through the eight fifth through holes 604 of the eight linear bearings 6, and the two twelfth bosses 803 of the fifth bracket 8 are passed through the two first through grooves 307 of the two third brackets 3, and are connected by sixteen screws 5; six measuring rods 4 are screwed into the six second screw holes 306 of the two third brackets 3.

[0049] The assembly process of the device for centrally measuring the fixed length of tube blanks provided by the utility model

[0050] Combination Figures 1 to 21 As shown, firstly, the eight eighth bosses 602 of the eight linear bearings 6 are inserted into the four sixth through holes 704 of the fourth bracket 7, and the thirty-two fourth through holes 603 of the eight linear bearings 6 are aligned with the sixteen third screw holes 705 of the fourth bracket 7, and then the thirty-two screws 5 are passed through the thirty-two fourth through holes 603 and screwed into the sixteen third screw holes 705, so that the eight linear bearings 6 and the fourth bracket 7 can be assembled;

[0051] Then, four wheels 9 are inserted into the four grooves 106 of the four first brackets 1, and the four axial holes of the four wheels 9 are aligned with the four second through holes 107 of the four first brackets 1, and then four hinges 10 are installed in the four groups of aligned through holes, so that the four first brackets 1 and the four wheels 9 can be assembled;

[0052] Then, eight third bosses 202 of two second brackets 2 are inserted into the eight first through holes 105 of four first brackets 1, and then four first bodies 101 of four first brackets 1 are inserted into four second through slots 706 of the fourth bracket 7, and sixteen first screw holes 104 of four first brackets 1 are aligned with thirty-two seventh through holes 707 of the fourth bracket 7, and then thirty-two screws 5 are passed through the thirty-two seventh through holes 707 and screwed into the sixteen first screw holes 104, so that two second brackets 2, four first brackets 1 and the fourth bracket 7 can be assembled;

[0053] Then, the four eleventh bosses 802 of the fifth bracket 8 are inserted into the eight fifth through holes 604 of the eight linear bearings 6, and then the two first through grooves 307 of the two third brackets 3 are sleeved outside the two twelfth bosses 803 of the fifth bracket 8, and the sixteen third through holes 305 of the two third brackets 3 and the eight fourth screw holes 804 of the fifth bracket 8 are aligned, and then the sixteen screws 5 are passed through the sixteen third through holes 305 and screwed into the eight fourth screw holes 804, so that the two third brackets 3, the fifth bracket 8 and the eight linear bearings 6 can be assembled;

[0054] Finally, the six threaded sections 403 of the six measuring rods 4 are screwed into the six second screw holes 306 of the two third brackets 3 respectively. In this way, the whole device is assembled and can be put into use.

[0055] The working principle of the device for centrally measuring the fixed length of tube blanks provided by the utility model

[0056] Combination Figure 6 and Fig. 22 As shown, the six measuring rods 4 are all at the zero scale position, and the original distance between the two coaxial measuring rods 4 is set as L0, and the length of the tube blank 11 to be measured is set as L x , the measuring rod 4 at the front end is set as ①, and the measuring rod 4 at the rear end is set as ②; screw in the coaxially arranged front and rear measuring rods 4 respectively, to ensure that the two measuring rods 4 are in contact with the front and rear end faces of the tube 11 to be measured, and set the screw-in distance of ① as △1, and the screw-in distance of ② as △2. According to the knowledge that the distance between parallel planes is equal everywhere, the following equation L can be obtained: x +△1+△2=L0, after sorting, the length L of the tube blank 11 to be measured can be obtained x =L0-△1-△2;

[0057] Combination Figure 6 and Fig. 22 As shown, the combined use of the six scale segments 404 of the six measuring rods 4 and the six sixth bosses 304 of the two third brackets 3 can form six screw micrometers, and the measurement accuracy of the six screw micrometers can reach 0.01mm. The reasoning process is: since the pitch value of the thread of the measuring rod 4 is 0.5mm, that is, every time the measuring rod 4 rotates one circle, the axial distance moved by the measuring rod 4 in the second screw hole 306 is 0.5mm, and since the side surface of the sixth boss 304 is evenly marked with fifty grid scales along the circumferential direction, therefore, every time the measuring rod 4 rotates one grid scale, the axial distance moved by the measuring rod 4 in the second screw hole 306 is 0.01mm, that is, the measurement accuracy can reach 0.01mm.

[0058] The use process of the device for centrally measuring the fixed length of tube blanks provided by the utility model

[0059] First, the six measuring rods 4 are rotated to the zero scale position, and then the original distance L0 between the two coaxially arranged front and rear measuring rods 4 is measured; then the four wheels 9 are rolled, and the fifth bracket 8 is moved downward along the eight fifth through holes 604 of the eight linear bearings 6, so that the six measuring rods 4 can face the six front and rear end faces of the three tube blanks 11, as shown in FIG. Figure 4 and Figure 5 As shown; then screw in the six measuring rods 4 respectively, and when the six contact sections 401 of the six measuring rods 4 all contact the front and rear six end faces of the three tube blanks 11, stop screwing in the six measuring rods 4; then read the screwing distances △1 and △2 of the six measuring rods 4 respectively, and use the formula L x = L0-△1-△2, the length L of the three tube blanks 11 can be calculated x ,like Fig. 22 shown.

[0060] Supplementary explanation: The device for centralized measurement of the cut-to-length length of tube blanks provided by the utility model is designed with a symmetrical structure. Firstly, the device of the utility model of multiple specifications should be designed and manufactured according to the diameter specifications of the tube blanks, the spacing distance of the tube blanks and the cut-to-length length of the tube blanks to match them; secondly, the initial scale lines of the six measuring rods 4 and the twelve sixth bosses 304 of the two third brackets 3 should be kept aligned to ensure the effectiveness of the measurement.

[0061] It can be seen from the embodiments that the device for centralized measurement of the cut-to-length length of tube blanks provided by the utility model can achieve the purpose of measuring the cut-to-length lengths of three tube blanks at the same time. The device of the utility model has the characteristics of low manufacturing cost, simple operation and good use effect.

[0062] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein.

Claims

1. A device for centrally measuring the fixed length of tube blanks, characterized in that: The device for centrally measuring the fixed length of a tube blank comprises: four first brackets (1), two second brackets (2), two third brackets (3), a fourth bracket (7), a fifth bracket (8), six measuring rods (4), eighty screws (5), eight linear bearings (6), four wheels (9) and four hinges (10), wherein: The first bracket (1) is composed of a first body (101), a first boss (102) and a second boss (103) connected together; the first body (101), the first boss (102) and the second boss (103) are all rectangular parallelepiped symmetrical structures; the first boss (102) is located on the lower end surface of the first body (101), and the second boss (103) is located on the lower end surface of the first boss (102); the first body (101) is symmetrically provided with four first screw holes (104); the first screw holes (104) are The screw (5) is screwed inside the first boss (102); the first boss (102) is provided with two rectangular first through holes (105), and the third boss (202) of the second bracket (2) is penetrated inside the first through hole (105); the lower end surface of the second boss (103) is provided with a rectangular groove (106), and the wheel (9) is penetrated inside the groove (106); the front and rear sides of the groove (106) are respectively provided with a cylindrical second through hole (107), and the hinge (10) is penetrated inside the second through hole (107); The second bracket (2) is composed of a second body (201) and four third bosses (202) connected together; the second body (201) and the third bosses (202) are both rectangular parallelepiped symmetrical structures; the four third bosses (202) are divided into two groups and are respectively located on the front and rear end surfaces of the second body (201); The third bracket (3) is composed of a third body (301), two fourth bosses (302), three fifth bosses (303) and six sixth bosses (304) connected together; the third body (301), the fourth bosses (302) and the fifth bosses (303) are all rectangular parallelepiped symmetrical structures; the two fourth bosses (302) are simultaneously located on the upper end surface of the third body (301); the three fifth bosses (303) are simultaneously located on the lower end surface of the third body (301); the six sixth bosses (304) are respectively located on the front and rear six end surfaces of the three fifth bosses (303); a rectangular parallelepiped-shaped third bracket (301) can be formed between the two fourth bosses (302); a through groove (307), wherein the twelfth boss (803) of the fifth bracket (8) is penetrated in the first through groove (307); the fourth boss (302) is symmetrically provided with four cylindrical third through holes (305), wherein the screw (5) is penetrated in the third through holes (305); the sixth boss (304) is a cylindrical symmetrical structure, wherein the side surface of the sixth boss (304) is uniformly marked with fifty grid scales along the circumferential direction; the sixth boss (304) is provided with a second screw hole (306) at the axial position, wherein the measuring rod (4) is screwed in the second screw hole (306), and the second screw hole (306) also penetrates the fifth boss (303); The fourth bracket (7) is composed of two sixth bodies (701), two ninth bosses (702) and eight tenth bosses (703) connected together. The sixth body (701), the ninth boss (702) and the tenth boss (703) are all rectangular parallelepiped symmetrical structures. The two ninth bosses (702) are simultaneously located between the two sixth bodies (701). The eight tenth bosses (703) are divided into four groups and are respectively located on the left and right end faces of the two sixth bodies (701). The sixth body (701) is symmetrically provided with two cylindrical sixth through holes (704). The sixth through holes (704) are provided with a plurality of cylindrical through holes (704). 04) is penetrated by an eighth boss (602) of the linear bearing (6); four third screw holes (705) are evenly arranged around the sixth through hole (704), and the screws (5) are screwed into the third screw holes (705); a second rectangular through groove (706) can be formed between the two tenth bosses (703) of each group, and the first body (101) of the first bracket (1) is penetrated into the second through groove (706); the tenth boss (703) is symmetrically provided with four seventh cylindrical through holes (707), and the screws (5) are penetrated into the seventh through holes (707); The fifth bracket (8) is composed of a seventh body (801), four eleventh bosses (802) and two twelfth bosses (803) connected together; the seventh body (801) and the twelfth bosses (803) are both rectangular parallelepiped symmetrical structures; the four eleventh bosses (802) are simultaneously located on the upper end surface of the seventh body (801); the two twelfth bosses (803) are simultaneously located on the lower end surface of the seventh body (801); the eleventh boss (802) is a cylindrical symmetrical structure, and is used to penetrate the fifth through hole (604) of the linear bearing (6); the twelfth boss (803) is symmetrically provided with four fourth screw holes (804), and the screws (5) are screwed into the fourth screw holes (804); The measuring rod (4) is composed of four parts connected together, namely, a coaxial contact section (401), an isolation section (402), a threaded section (403) and a scale section (404); the contact section (401) and the isolation section (402) are both cylindrical symmetrical structures; the threaded section (403) is a cylindrical symmetrical structure with a thread on the side surface, used for screwing to the second screw hole (306) of the third bracket (3), and the pitch value of the thread is 0.5 mm; the scale section (404) is a cylindrical symmetrical structure, and the side surface of the cylinder is evenly marked with four groups of scales along the circumferential direction, each group of scales is composed of two adjacent upper and lower rows of offset scales, the offset value of the two rows of offset scales is 0.5 mm, and the minimum grid value of the offset scales is 1 mm.

2. The device for centrally measuring the fixed length of tube blanks according to claim 1 is characterized in that: The screw (5) is composed of a fourth body (501) and a seventh boss (502) which are coaxially connected. The fourth body (501) and the seventh boss (502) are both cylindrical symmetrical structures. The seventh boss (502) is located at the rear end surface of the fourth body (501). The end of the seventh boss (502) is provided with a thread for screwing into the first screw hole (104) of the first bracket (1), the third screw hole (705) of the fourth bracket (7) or the fourth screw hole (804) of the fifth bracket (8).

3. The device for centrally measuring the fixed length of tube blanks according to claim 1 is characterized in that: The linear bearing (6) is composed of a fifth body (601) and an eighth boss (602) connected together, wherein the eighth boss (602) is located on the upper end surface of the fifth body (601); the fifth body (601) is a rectangular parallelepiped symmetrical structure, and the fifth body (601) is symmetrically provided with four cylindrical fourth through holes (603), wherein the screws (5) are passed through the fourth through holes (603); the eighth boss (602) is a cylindrical Symmetrical structure, a cylindrical fifth through hole (604) is opened at the axial position of the eighth boss (602), the eleventh boss (802) of the fifth bracket (8) is passed through the fifth through hole (604), and the fifth through hole (604) also passes through the fifth body (601); a retaining frame, a ball and a retaining ring are also provided inside the eighth boss (602), a plurality of the balls are evenly arranged inside the retaining frame, and the retaining rings are provided at both ends of the retaining frame.

4. The device for centrally measuring the fixed length of tube blanks according to claim 1 is characterized in that: The wheel (9) and the hinge (10) are both standard parts.

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