Device for measuring fixed length of square billet

Abstract

The utility model discloses a device for measuring the fixed length of a square billet, and belongs to the technical field of square billet geometric dimension measurement. The device for measuring the fixed length of the square billet comprises two first brackets, two second brackets, a third bracket, two fourth brackets, a bottom plate, a rotating shaft, eight screws, two measuring rods, two rolling bearings, two hinges, sixteen screw rods and sixteen nuts, the device can realize the purpose of accurately measuring and calculating the fixed length of the square billet which is horizontally arranged, and 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 square billet geometric dimension measurement and relates to a device for measuring the fixed length of a square billet. Background Art

[0002] At present, the process of hot rolling of square billets is usually adopted to produce long profile products such as rails, small H-shaped steels, bars and wires. In order to improve the yield rate, the fixed length of the square billets is accurately calculated according to the production specifications of the long profile products. Therefore, before the square billets enter the heating furnace, the length of the square billets needs to be measured one by one; the traditional square billet length measuring device is usually based on a measuring reference surface. Since the moving square billet will inevitably impact the measuring reference surface during the process of contacting the measuring reference surface, the traditional length measuring device is relatively more damaging to the equipment; in view of this, some companies have successively developed non-contact length measuring devices and length measuring devices based on two measuring reference surfaces, but these square 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 three literature patents are most relevant to the utility model technology, and the specific contents are described as follows:

[0004] Patent document CN103913140 A discloses a device and method for accurately measuring the length of a cast billet. The device mainly includes a roller, a counter, a processor, an inlet sensor and an outlet sensor. When the cast billet passes through the inlet sensor and the outlet sensor, a trigger signal is generated, the counter counts according to the trigger signal, and the processor calculates the length of the cast billet according to the distance and the counting result. Since non-contact measurement is adopted, damage to the equipment can be avoided. Since sensors are used for detection, accurate measurement can be achieved, but the manufacturing cost of the device is relatively high.

[0005] Patent document CN 210587051 U discloses an improved billet length measuring device for a square billet continuous casting machine. The patented device mainly includes a guide wheel, a spring, a positioning device, an encoder, a length detection device, a computer and a flame cutting machine. The device adopts an improved length detection device to overcome the detection error caused by the slipping of the billet during the contact measurement process. However, the 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 device is relatively low.

[0006] Patent document CN 216502258 U discloses a billet fixed-length measuring device. The device mainly includes a ranging platform, conveying rollers, a ranging frame, a telescopic rod, a lifting platform, a rangefinder, a vertical plate, a movable plate and clamping rollers. Since the device measures the length of the billet based on two measurement reference planes, that is, the length of the billet is obtained by measuring the distances from two rangefinders to the front and rear ends of the billet respectively. Therefore, the measurement accuracy and working efficiency of the device are relatively high, but the manufacturing cost of the device is also relatively high. Summary of the Utility Model

[0007] In order to overcome one or more of the problems existing in the prior art, the present utility model provides a device for measuring the fixed-length of a billet. The device of the present utility model is designed with a symmetrical structure and measures the two ends of the billet based on two measurement reference planes, which avoids the impact of the moving billet on the measurement reference plane; the use of the first bracket can achieve the precise positioning of the third bracket, and the combined use of the third bracket and the screw can achieve the relative setting of the fourth bracket; the combined use of the second bracket, rolling bearings, a rotating shaft and a hinge can achieve the flipping of the third bracket; the combined use of the two scale segments of the two measuring rods and the two seventh convex platforms of the two fourth brackets can form two micrometers, so as to accurately measure the length of the billet. Therefore, the use effect of the device of the present utility model is relatively good.

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

[0009] The device for measuring the fixed-length of a billet provided by the present utility model includes: two first brackets, two second brackets, one third bracket, two fourth brackets, one base plate, one rotating shaft, eight screws, two measuring rods, two rolling bearings, two hinges, sixteen screw rods and sixteen nuts;

[0010] The first bracket is connected and composed of a first body, two first convex platforms and a second convex platform. The first body, the first convex platform and the second convex platform are all symmetric structures in the shape of a cuboid. The two first convex platforms are relatively arranged and are both located on the upper end surface of the first body. The second convex platform is located on the upper end surfaces of the two first convex platforms; four cylindrical first through holes are symmetrically opened in the first body, and the screw rod is passed through the first through hole.

[0011] The second bracket is composed of a second body, a third boss and a fourth boss connected together. The second body, the third boss and the fourth boss are all symmetric structures in the shape of a cuboid. The third boss is located on the upper end face of the second body, and the fourth boss is located on the upper end face of the third boss. Four cylindrical fourth through holes are symmetrically formed in the second body, and the screw rod is inserted through the fourth through holes. A cylindrical groove is formed at the center position of the rear end face of the fourth boss, and the rolling bearing is inserted through the groove. A cylindrical fifth through hole is formed at the axial position of the groove, and the bearing section of the rotating shaft is inserted through the fifth through hole.

[0012] The third bracket is composed of a third body, a fourth body and a fifth boss connected together. The third body, the fourth body and the fifth boss are all symmetric structures in the shape of a cuboid. The third body and the fourth body are arranged oppositely, and the fifth boss is located between the third body and the fourth body. A regular octahedron-shaped seventh through hole is formed at the center position of the third body, and the positioning section of the rotating shaft is inserted through the seventh through hole. Four first screw holes are respectively formed on the front and rear end faces of the fourth body, and the screws are screwed into the first screw holes.

[0013] The fourth bracket is composed of a sixth body, two seventh bosses, an eighth boss and a ninth boss connected together. The sixth body, the eighth boss and the ninth boss are all symmetric structures in the shape of a cuboid. The eighth boss is located on the upper end face of the sixth body, the ninth boss is located on the upper end face of the eighth boss, and the two seventh bosses are arranged oppositely and are respectively located on the front and rear end faces of the sixth body. Four cylindrical eighth through holes are symmetrically formed in the ninth boss, and the screws are inserted through the eighth through holes. The seventh boss is a symmetric structure in the shape of a cylinder, and fifty scale graduations are evenly marked on the side surface of the seventh boss along the circumferential direction. A second screw hole is formed at the axial position of the seventh boss, and the measuring rod is screwed into the second screw hole, and the second screw hole also penetrates through the sixth body.

[0014] The bottom plate is a symmetric structure in the shape of a cuboid. Two groups of eight cylindrical second through holes are symmetrically formed in the left half of the bottom plate, and the screw rods are inserted through the second through holes. Two groups of eight cylindrical third through holes are symmetrically formed in the right half of the bottom plate, and the screw rods are inserted through the third through holes.

[0015] The measuring rod is composed of four coaxial connected parts: a contact section, an isolation section, a threaded section, and a scale section. The contact section and the isolation section are both symmetric structures in the shape of a cylinder; the threaded section is a symmetric structure in the shape of a cylinder with threads on its side, and is used to screw into the second threaded hole of the fourth bracket. The pitch value of the threads is 0.5 mm; the scale section is a symmetric structure in the shape of a cylinder. Four groups of scales are evenly marked on the side of the cylinder 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 division value of the offset scales is 1 mm.

[0016] In some embodiments, the rotating shaft is composed of bearing sections at both ends and a clamping section in the middle. The bearing sections are symmetric structures in the shape of a cylinder and are used to pass through the rolling bearings; the clamping section is a symmetric structure in the shape of a regular octahedron and is used to pass through the seventh through hole of the third bracket; two cylinder-shaped sixth through holes are symmetrically opened in the clamping section, and the hinge is passed through the sixth through holes.

[0017] In some embodiments, the screw is composed of a coaxial fifth body and a sixth boss connected. Both the fifth body and the sixth boss are symmetric structures in the shape of a cylinder. The sixth boss is located at the rear end face of the fifth body; the end of the sixth boss is provided with threads for screwing into the first threaded hole of the third bracket.

[0018] In some embodiments, the threaded end of the screw rod is screwed with the nut.

[0019] In some embodiments, the rolling bearings, the hinges, the screw rods, and the nuts are all standard parts.

[0020] The beneficial effects of the present utility model are as follows:

[0021] 1) The device for measuring the fixed-length of a square billet provided by the present utility model includes two first brackets, two second brackets, one third bracket, two fourth brackets, a bottom plate, a rotating shaft, eight screws, two measuring rods, two rolling bearings, two hinges, sixteen screw rods, and sixteen nuts. Since the materials are common and easy to process and form, the manufacturing cost of the device of the present utility model is relatively low.

[0022] 2) When the device of the present utility model is in use, rotate both measuring rods to the zero scale position, and measure the original distance L0 between the two measuring rods; rotate the rotating shaft and turn the third bracket to a vertical setting, and place the square billet to be measured between the four first bosses of the two first brackets; rotate the rotating shaft 90 degrees clockwise so as to turn the third bracket to a horizontal setting, and place the fourth body on the two second bosses of the two first brackets; screw in the two measuring rods respectively, and stop screwing in the two measuring rods when both contact segments contact the front and rear end faces of the square billet, and read △1 and △2 respectively. Therefore, the operation of the device of the present utility model is relatively simple.

[0023] 3) The device of the present utility model is designed with a symmetrical structure, and measures the two ends of the square billet based on two measurement reference planes, which avoids the impact of the moving square billet on the measurement reference plane; the use of the first bracket can achieve the precise positioning of the third bracket, and the combined use of the third bracket and the screw can achieve the relative setting of the fourth bracket; the combined use of the second bracket, the rolling bearing, the rotating shaft and the hinge can achieve the turning of the third bracket; the combined use of the two scale segments of the two measuring rods and the two seventh bosses of the two fourth brackets can form two micrometers, so as to accurately measure the length of the square billet. Therefore, the use effect of the device of the present utility model is relatively good.

[0024] Through the device for measuring the specified length of the square billet provided by the present utility model, the purpose of accurately calculating the specified length of the horizontally arranged square billet can be achieved. The device of the present utility model has the characteristics of low manufacturing cost, simple operation and good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is the front view structural schematic diagram of the device for measuring the specified length of the square billet of the present utility model when the third bracket is vertically arranged;

[0026] Figure 2 It is the left view structural schematic diagram of the device for measuring the specified length of the square billet of the present utility model when the third bracket is vertically arranged;

[0027] Figure 3 It is the top view structural schematic diagram of the device for measuring the specified length of the square billet of the present utility model when the third bracket is vertically arranged;

[0028] Figure 4 It is the front view structural schematic diagram of the device for measuring the specified length of the square billet of the present utility model when the third bracket is horizontally arranged;

[0029] Figure 5 It is the left view structural schematic diagram of the device for measuring the specified length of the square billet of the present utility model when the third bracket is horizontally arranged;

[0030] Figure 6Schematic top view of the device for measuring the fixed length of a square billet of the present utility model when the third bracket is horizontally arranged;

[0031] Figure 7 Schematic front view of the first bracket of the present utility model;

[0032] Figure 8 Schematic top view of the first bracket of the present utility model;

[0033] Figure 9 Schematic top view of the bottom plate of the present utility model;

[0034] Figure 10 Schematic front view of the second bracket of the present utility model;

[0035] Figure 11 Schematic top view of the second bracket of the present utility model;

[0036] Figure 12 Schematic left view of the rotating shaft of the present utility model;

[0037] Figure 13 Schematic front view of the third bracket of the present utility model;

[0038] Figure 14 Schematic top view of the third bracket of the present utility model;

[0039] Figure 15 Schematic left view of the screw of the present utility model;

[0040] Figure 16 Schematic front view of the fourth bracket of the present utility model;

[0041] Figure 17 Schematic left view of the fourth bracket of the present utility model;

[0042] Figure 18 Schematic top view of the measuring rod of the present utility model;

[0043] Figure 19 Schematic diagram of the working principle of the device for measuring the fixed length of a square billet of the present utility model.

[0044] Description of reference numerals: 1 - first bracket; 101 - first body; 102 - first boss; 103 - second boss; 104 - first through hole; 2 - bottom plate; 201 - second through hole; 202 - third through hole; 3 - second bracket; 301 - second body; 302 - third boss; 303 - fourth boss; 304 - fourth through hole; 305 - groove; 306 - fifth through hole; 4 - rotating shaft; 401 - clamping section; 402 - bearing section; 403 - sixth through hole; 5 - third bracket; 501 - third body; 502 - fourth body; 503 - fifth boss; 504 - seventh through hole; 505 - first screw hole; 6 - screw; 601 - fifth body; 602 - sixth boss; 7 - fourth bracket; 701 - sixth body; 702 - seventh boss; 703 - eighth boss; 704 - ninth boss; 705 - second screw hole; 706 - eighth through hole; 8 - measuring rod; 801 - contact section; 802 - isolation section; 803 - threaded section; 804 - graduated section; 9 - rolling bearing; 10 - hinge; 11 - screw rod; 12 - nut; 13 - billet. Detailed implementation mode

[0045] The content of the present utility model will be described in detail below through embodiments and drawings. The embodiments are only used to understand the present utility model, rather than limiting the content of the present utility model.

[0046] Combined with Figures 1 to 6 As shown, the present utility model provides a device for measuring the specified length of a billet, which includes two first brackets 1, two second brackets 3, one third bracket 5, two fourth brackets 7, one bottom plate 2, one rotating shaft 4, eight screws 6, two measuring rods 8, two rolling bearings 9, two hinges 10, sixteen screw rods 11 and sixteen nuts 12; wherein, two of the second brackets 3 arranged oppositely are simultaneously arranged on the bottom plate 2 and are connected by eight of the screw rods 11 and eight of the nuts 12; two of the rolling bearings 9 are installed in two of the grooves 305 of the two second brackets 3, and two of the bearing sections 402 of the rotating shaft 4 pass through the two rolling bearings 9; the clamping section 401 of the rotating shaft 4 passes through the seventh through hole 504 of the third bracket 5 and is positioned by two of the hinges 10; the front and rear end faces of the fourth body 502 of the third bracket 5 are provided with two of the ninth bosses 704 of the two fourth brackets 7 and are connected by eight of the screws 6; two of the measuring rods 8 are screwed into two of the second screw holes 705 of the two fourth brackets 7, and two of the first brackets 1 arranged oppositely are simultaneously arranged on the bottom plate 2 and are connected by eight of the screw rods 11 and eight of the nuts 12.

[0047] Assembly process of the device for measuring the specified length of a billet provided by the present utility model

[0048] Combination Figures 1 to 18 As shown, first, the clamping section 401 of the rotating shaft 4 is inserted into the seventh through-hole 504 of the third bracket 5, and then two hinges 10 are installed in the two sixth through-holes 403 of the rotating shaft 4. In this way, the rotating shaft 4 and the third bracket 5 can be assembled through the two hinges 10;

[0049] Then, two rolling bearings 9 are installed in the two grooves 305 of the two second brackets 3. Then, the two grooves 305 of the two second brackets 3 are arranged opposite to each other, and the bearing sections 402 at both ends of the rotating shaft 4 are respectively inserted into the two rolling bearings 9. In this way, the rotating shaft 4, the two rolling bearings 9 and the two second brackets 3 can be assembled;

[0050] Then, the bottom plate 2 is placed on the installation table, and the two second brackets 3 are simultaneously placed on the bottom plate 2. The eight fourth through-holes 304 of the two second brackets 3 and the eight second through-holes 201 of the bottom plate 2 are aligned. Then, eight screws 11 are inserted into the eight groups of aligned through-holes, and eight nuts 12 are screwed onto the threaded ends of the eight screws 11. In this way, the two second brackets 3 and the bottom plate 2 can be assembled;

[0051] Then, the two ninth bosses 704 of the two fourth brackets 7 are respectively arranged outside the front and rear end faces of the fourth body 502 of the third bracket 5. The eight eighth through-holes 706 of the two fourth brackets 7 and the eight first screw holes 505 of the fourth bracket 7 are aligned. Then, eight screws 6 are passed through the eight eighth through-holes 706 and screwed into the eight first screw holes 505. In this way, the two fourth brackets 7 and the third bracket 5 can be assembled through the eight screws 6;

[0052] Then, the two first brackets 1 are simultaneously placed on the bottom plate 2. The eight first through-holes 104 of the two first brackets 1 and the eight third through-holes 202 of the bottom plate 2 are aligned. Then, eight screws 11 are inserted into the eight groups of aligned through-holes, and eight nuts 12 are screwed onto the threaded ends of the eight screws 11. In this way, the two first brackets 1 and the bottom plate 2 can be assembled;

[0053] Finally, the two threaded sections 803 of the two measuring rods 8 are respectively screwed into the two second screw holes 705 of the two fourth brackets 7. In this way, the whole set of device is assembled and can be put into use.

[0054] The working principle of the device for measuring the fixed length of a square billet provided by the present utility model

[0055] CombinationFigure 3 and Figure 6 As shown, when the front and rear measuring rods 8 arranged coaxially are both at the zero scale position, the original distance between the two measuring rods 8 at this time is set as L0, and the length of the square billet 13 to be measured is set as L x , the front measuring rod 8 is set as ①, and the rear measuring rod 8 is set as ②; the front and rear measuring rods 8 arranged coaxially are respectively screwed in to ensure that both measuring rods 8 contact the front and rear end faces of the square billet 13 to be measured. The screwed-in distance of ① is set as △1, and the screwed-in distance of ② is set as △2. According to the knowledge point that the distance between parallel planes is equal everywhere, the following equation can be obtained: L x +△1 + △2 + the lengths of the two measuring rods 8 = L0 + the lengths of the two measuring rods 8. After sorting, the length L of the square billet 13 to be measured can be obtained x = L0 - △1 - △2;

[0056] Combined with Figure 19 As shown, the combined use of the two scale segments 804 of the two measuring rods 8 and the two seventh bosses 702 of the two fourth brackets 7 can form two micrometers, and the measurement accuracy of both micrometers can reach 0.01 mm. The reasoning process is as follows: Since the pitch value of the thread of the measuring rod 8 is 0.5 mm, that is, when the measuring rod 8 rotates one week, the axial distance that the measuring rod 8 moves within the second screw hole 705 is 0.5 mm. Since the side surface of the seventh boss 702 is uniformly marked with fifty scale divisions along the circumferential direction, therefore, when the measuring rod 8 rotates one scale division, the axial distance that the measuring rod 8 moves within the second screw hole 705 is 0.01 mm, that is, the measurement accuracy can reach 0.01 mm.

[0057] The using process of the device for measuring the specified length of a square billet provided by the present utility model

[0058] First, both measuring rods 8 arranged coaxially are screwed to the zero scale position, and then the original distance L0 between the two measuring rods 8 is measured; then the rotating shaft 4 is rotated so as to turn the third bracket 5 into a vertical setting, and then the square billet 13 to be measured is arranged between the four first bosses 102 of the two first brackets 1, as Figures 1 to 3 shown; then the rotating shaft 4 is rotated 90 degrees clockwise so as to turn the third bracket 5 into a horizontal setting, and the fourth body 502 is arranged on the two second bosses 103 of the two first brackets 1. At this time, the two measuring rods 8 are facing the front and rear end faces of the square billet 13, as Figures 4 to 6As shown; then screw in the two measuring rods 8 respectively. When the two contact segments 801 of the two measuring rods 8 both come into contact with the front and rear end faces of the square billet 13, stop screwing in the two measuring rods 8. As Figure 19 shown, then read the distances △1 and △2 that the two measuring rods 8 are screwed in respectively, and substitute them into the formula L x = L0 - △1 - △2 for calculation.

[0059] Supplementary note: The device for measuring the specified length of the square billet provided by the present invention is designed with a symmetric structure. First, according to the cross-sectional specifications of the square billet, the installation height of the square billet, and the specified length of the square billet, multiple specifications of the device of the present invention should be designed and manufactured to match it; secondly, the initial scale lines of the four seventh bosses 702 of the two measuring rods 8 and the two fourth brackets 7 should be kept aligned to ensure the effectiveness of the measurement.

[0060] It can be seen from the embodiments that by using the device for measuring the specified length of the square billet provided by the present invention, the purpose of accurately measuring the specified length of the horizontally arranged square billet can be achieved. The device of the present invention has the characteristics of low manufacturing cost, simple operation, and good use effect.

[0061] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features.

Claims

1. A device for measuring the specified length of a square billet, characterized in that, The device for measuring the specified length of a square billet includes: two first brackets (1), two second brackets (3), one third bracket (5), two fourth brackets (7), one base plate (2), one rotating shaft (4), eight screws (6), two measuring rods (8), two rolling bearings (9), two hinges (10), sixteen screws (11) and sixteen nuts (12), where: The first bracket (1) is composed of the connection of a first body (101), two first bosses (102) and a second boss (103). The first body (101), the first bosses (102) and the second boss (103) are all symmetric structures in the shape of a cuboid. The two first bosses (102) are arranged oppositely and are both located on the upper end surface of the first body (101). The second boss (103) is located on the upper end surfaces of the two first bosses (102). Four cylindrical first through holes (104) are symmetrically opened on the first body (101), and the screw (11) is inserted through the first through holes (104); The second bracket (3) is composed of the connection of a second body (301), a third boss (302) and a fourth boss (303). The second body (301), the third boss (302) and the fourth boss (303) are all symmetric structures in the shape of a cuboid. The third boss (302) is located on the upper end surface of the second body (301). The fourth boss (303) is located on the upper end surface of the third boss (302). Four cylindrical fourth through holes (304) are symmetrically opened on the second body (301), and the screw (11) is inserted through the fourth through holes (304). A cylindrical groove (305) is opened at the center position of the rear end surface of the fourth boss (303), and the rolling bearing (9) is inserted through the groove (305). A cylindrical fifth through hole (306) is opened at the axis position of the groove (305), and the bearing section (402) of the rotating shaft (4) is inserted through the fifth through hole (306); The third bracket (5) is composed of the connection of a third body (501), a fourth body (502) and a fifth boss (503). The third body (501), the fourth body (502) and the fifth boss (503) are all symmetric structures in the shape of a cuboid. The third body (501) and the fourth body (502) are arranged oppositely. The fifth boss (503) is located between the third body (501) and the fourth body (502). A regular octahedron-shaped seventh through hole (504) is opened at the center position of the third body (501), and the positioning section (401) of the rotating shaft (4) is inserted through the seventh through hole (504). Four first screw holes (505) are respectively opened on the front and rear end surfaces of the fourth body (502), and the screw (6) is screwed into the first screw holes (505); The fourth bracket (7) is composed of a sixth body (701), two seventh bosses (702), an eighth boss (703) and a ninth boss (704) connected together. The sixth body (701), the eighth boss (703) and the ninth boss (704) are all symmetric structures in the shape of a cuboid. The eighth boss (703) is located on the upper end face of the sixth body (701), the ninth boss (704) is located on the upper end face of the eighth boss (703), and the two seventh bosses (702) are arranged oppositely and are respectively located on the front and rear end faces of the sixth body (701). Four cylindrical eighth through holes (706) are symmetrically opened in the ninth boss (704), and the screw (6) is inserted through the eighth through holes (706). The seventh boss (702) is a symmetric structure in the shape of a cylinder, and fifty scale divisions are uniformly marked on the side surface of the seventh boss (702) along the circumferential direction. A second screw hole (705) is opened at the axial position of the seventh boss (702), and the measuring rod (8) is screwed into the second screw hole (705), and the second screw hole (705) also penetrates through the sixth body (701). The bottom plate (2) is a symmetric structure in the shape of a cuboid. Two groups of eight cylindrical second through holes (201) are symmetrically opened in the left half of the bottom plate (2), and the screw (11) is inserted through the second through holes (201). Two groups of eight cylindrical third through holes (202) are symmetrically opened in the right half of the bottom plate (2), and the screw (11) is inserted through the third through holes (202). The measuring rod (8) is composed of four parts connected together, namely a contact section (801), an isolation section (802), a threaded section (803) and a scale section (804) coaxially arranged. The contact section (801) and the isolation section (802) are both symmetric structures in the shape of a cylinder. The threaded section (803) is a symmetric structure in the shape of a cylinder with threads on the side surface, and is used to be screwed into the second screw hole (705) of the fourth bracket (7), and the pitch value of the thread is 0.5 mm. The scale section (804) is a symmetric structure in the shape of a cylinder, and four groups of scales are uniformly marked on the side surface of the cylinder along the circumferential direction. Each group of scales is composed of two adjacent upper and lower rows of staggered scales, the stagger value of the two rows of staggered scales is 0.5 mm, and the minimum scale division value of the staggered scales is 1 mm.

2. The device for measuring the specified length of a square billet according to claim 1, characterized in that, The rotating shaft (4) is composed of bearing sections (402) located at both ends and a clamping section (401) located in the middle. The bearing sections (402) are symmetric structures in the shape of a cylinder and are used to insert the rolling bearings (9). The clamping section (401) is a symmetric structure in the shape of a regular octahedron and is used to insert the seventh through hole (504) of the third bracket (5). Two cylindrical sixth through holes (403) are symmetrically opened in the clamping section (401), and the hinge (10) is inserted through the sixth through holes (403).

3. The device for measuring the specified length of a square billet according to claim 1, characterized in that, The screw (6) is composed of a coaxial fifth body (601) and a sixth boss (602) connected thereto. Both the fifth body (601) and the sixth boss (602) are symmetric structures in the shape of a cylinder, and the sixth boss (602) is located at the rear end face of the fifth body (601); a thread is provided at the end of the sixth boss (602) for screwing into the first screw hole (505) of the third bracket (5).

4. The device for measuring the specified length of a square billet according to claim 1, characterized in that, The nut (12) is screwed onto the threaded end of the screw rod (11).

5. The device for measuring the specified length of a square billet according to claim 1, characterized in that, The rolling bearing (9), the hinge (10), the screw rod (11) and the nut (12) are all standard parts.

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