Metal bar bending degree measuring device

Abstract

The invention relates to a device for measuring the bending degree of a metal bar. Comprising a workbench, a first supporting piece arranged on the workbench, a supporting wheel rotating on the first supporting piece, a bar rotating on the supporting wheel, a belt driving the bar to rotate, a first driving piece driving the belt to rotate, a second supporting piece arranged on the workbench and a third supporting piece rotating on the second supporting piece. The limiting piece is used for limiting the position of the third supporting piece on the second supporting piece; the detection device is used for detecting the bending degree of the bar; the limiting piece is arranged on the third supporting piece; the detection device is arranged on the third supporting piece; the acting end of the detection device abuts against the side wall of the bar. The problems that in the prior art, due to the fact that three sets of measuring rods are used, part of the three sets of measuring rods are not measured, when bars with different diameters are measured, the bars need to be moved to the measuring rods and need to be kept perpendicular to the measuring rods all the time, and the bent positions of the bars can be observed only when the bars need to be manually rotated are solved.

Description

Technical Field

[0001] The invention relates to the field of bars, and in particular to a device for measuring the curvature of a metal bar. Background Art

[0002] Curvature refers to the degree of curvature of long rolled products (profiles, bars, and tubes) in the length direction. The chord height of the bend per meter is the curvature per meter, and the ratio of the total chord height of the total length to the total length is the total curvature. In the production process of metal bars, it is necessary to measure their curvature to prevent defective metal bars from being produced.

[0003] There is a device for measuring the curvature of a metal bar. When in use, the metal bar is placed in a clamping device for clamping, and standard rods on both sides of the measuring device are placed against the surface of the metal bar to be measured. Then, the curvature of the metal bar is measured by the measuring rods, and the reading is taken by a scale.

[0004] The utility model CN202221943739.2 discloses a device for measuring the curvature of a metal bar, comprising: a measuring rod is arranged below the crossbeam of the measuring device, and a standard rod is arranged below the crossbeam of the measuring device; an adjusting frame is arranged below the crossbeam of the measuring device, a guide rod and an adjusting rod are arranged inside the adjusting frame, and a metal bar is arranged below the adjusting frame; a clamping plate is sleeved on the surface of the guide rod and the adjusting rod; the beneficial effect is: when measuring the curvature of the metal bar, the metal bar is placed between two groups of clamping plates, and the two groups of clamping plates are controlled to move toward the direction of the metal bar to clamp the metal bar, and at the same time drive the metal bar to move toward the direction of the standard rod, which solves the problem of surface measurement, but the use of three groups of measuring rods will result in some parts not being measured, and when measuring bars of different diameters, the bar needs to be moved to the measuring rod and the bar needs to be kept perpendicular to the detection rod at all times, and the bar needs to be manually rotated to observe where it is bent. Summary of the invention

[0005] The embodiment of the present application provides a device for measuring the curvature of a metal bar, thereby solving the problem in the prior art that three sets of measuring rods may result in some parts not being measured, and when measuring bars of different diameters, the bar needs to be moved to the measuring rod and the bar needs to be kept perpendicular to the measuring rod at all times, and the bar needs to be manually rotated to observe where it is bent.

[0006] The technical solution adopted in the embodiments of the present application is as follows.

[0007] A device for measuring the curvature of a metal bar comprises a workbench, a first support member arranged on the workbench, a support wheel rotating on the first support member, a bar rotating on the support wheel, a belt driving the bar to rotate, a first driving member driving the belt to rotate, a second support member arranged on the workbench, a third support member rotating on the second support member, a limiter limiting the position of the third support member on the second support member, and a detection device for detecting the curvature of the bar; the first support member is provided with two groups on both sides of the second support member; the belt presses down the bar and drives the bar to rotate when the belt rotates; the first driving member is provided on one side of the workbench; the limiter is provided on the third support member; the detection device is provided on the third support member; the action end of the detection device abuts against the side wall of the bar.

[0008] As a further improvement of the above technical solution: the second support member is provided with a first wheel and a second wheel; the third support member is provided with a third wheel and a fourth wheel; the action end of the first driving member is provided with a fifth wheel; the belt sequentially contacts the fifth wheel, the second wheel, the third wheel, the fourth wheel, the rod and the first wheel; the second wheel is provided at the rotation point between the second support member and the third support member; the third wheel is provided at the highest point of the third support member; the fourth wheel is provided at one end of the third support member; the second support member is provided with a first groove; when the third support member rotates until the belt fits the rod, the fourth wheel is located in the first groove.

[0009] As a further improvement of the above technical solution: the limit member is arranged at one end of the third support member; the limit member is located below the fourth wheel; the limit member includes a first block, a first rod rotating in the first block and a limit block limiting the third support member; the limit block is arranged on the end face of the first rod; the limit block is cylindrical and a first surface is provided on the side wall of the limit block; a gap is left between the first surface and the second support member; when the arc-shaped side wall of the limit block contacts the second support member, the limit block is interference fit and pressed on the second support member; the first block corresponds to the first groove.

[0010] As a further improvement of the above technical solution: the detection device includes a fourth support member, a rotating member rotating in the fourth support member, a second driving member driving the rotating member to rotate, and a detection member arranged in the fourth support member; a second groove is opened on the fourth support member; the rotating member rotates in the second groove; the detection member slides in the second groove; the detection member array is arranged in three groups; two groups of the detection members are approached or moved away from each other through the rotating member, and one group of the detection members is located in the middle of the fourth support member and remains stationary.

[0011] As a further improvement of the above technical solution: the detection member includes a second block, a third block arranged on the second block, a detection head sliding on the third block, an elastic member that allows the detection head to always press against the side wall of the rod, and a sensor that detects the movement amplitude of the detection head; a third groove is provided on the third block; a fourth block is provided on the detection head; the fourth block slides in the third groove and the side wall of the fourth block corresponds to the side wall of the third groove; one end of the elastic member is fixed on the fourth block, and the other end of the elastic member is fixed to the bottom of the third groove; the sensor is provided at the top of the third groove; the sensor detects the distance between the sensor and the fourth block.

[0012] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0013] 1. A workbench is arranged on the ground, a second support member is arranged in the middle of the workbench, second support members are arranged on both sides of the second support member, a support wheel is rotatably connected to the second support member, two groups of support wheels are arranged relatively, a rod is rotatably connected between the two groups of support wheels, the rod rolls on the support wheel, the third support member rotates on the second support member, a second wheel is arranged at the connection between the third support member and the second support member, a third wheel is arranged on the top wall of the third support member, a fourth wheel is arranged at the end of the third support member away from the second wheel, a first groove is opened on the second support member, the first groove corresponds to the fourth wheel, the fourth wheel is located in the first groove, the first wheel is rotatably connected to the second support member, a first driving member is arranged on the workbench, the first driving member is a motor, and the first driving member is a motor. A fifth wheel is arranged at the action end of the moving part, and the fifth wheel, the fourth wheel, the third wheel, the second wheel and the first wheel are in the same plane, and the belt contacts the fifth wheel, the second wheel, the third wheel, the fourth wheel, the rod and the first wheel in sequence, so that the driving part drives the fifth wheel to rotate and drives the belt transmission so that the belt drives the rod to rotate, thereby rotating the rod, and a detection device is arranged on the workbench, and a first block is arranged at one end of the third supporting part, and the first block corresponds to the first groove, and a first rod is rotatably connected to the first block, and a limiting block is arranged on the end face of the first rod, and the limiting block is cylindrical and a first surface is opened on the side wall of the limiting block, and a gap is left between the first surface and the second supporting part, and when the side wall of the limiting part contacts the second supporting part in an arc shape, the limiting block is pressed against the side wall of the second supporting part by interference fit, Thereby fixing the position of the second support member, the fourth support member is arranged on the third support member, the fourth support member moves synchronously with the third support member, a second groove is provided on the fourth support member, a rotating member is rotatably connected in the second groove, the rotating member is a bidirectional screw, a second driving member is provided on the fourth support member, the second driving member drives the rotating member to rotate, the second driving member is a motor, a second block is provided in the second groove, the second block array is provided with three groups, the second blocks arranged in the left and right groups are respectively threadedly connected to the threads on both sides of the rotating member, the rotating member is penetrated by the second block arranged in the middle and there is no transmission connection between the rotating member and the second block, a third block is provided at the bottom of the second block, the third block is cylindrical, a third groove is provided on the third block, the fourth block is slidably connected in the third groove, and the fourth block and the first The side walls of the three grooves are fitted together, and an elastic member is arranged on the third groove, one end of the elastic member is fixed on the third groove, and the other end of the elastic member is fixedly connected to the fourth block. A detection head is arranged on the fourth block, and the detection head is passed through the third block. The elastic member is sleeved on the detection head, and the detection head corresponds to the side wall of the rod. A sensor is arranged on the top wall of the third groove, and the sensor detects the distance of the fourth block from the sensor. When the belt drives the rod to rotate, the detection head contacts the side wall of the rod. With the rotation of the rod, it detects whether the rod is bent and its bending angle. After detecting one data, the second driving member is driven to drive the detection devices on both sides to gradually approach to detect the curvature of the remaining places. At the same time, the center point position of the rod is observed through the detection device in the middle, so that data comparison can be performed.The belt drives the bar to rotate, and the stretchable nature of the belt allows it to be used with bars of different diameters. The detection device can stay at any position on the bar, thus making the data complete. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of the device for measuring the curvature of a metal bar in the present invention.

[0015] Figure 2 It is a schematic structural diagram of the device for measuring the curvature of a metal bar in the present invention.

[0016] Figure 3 It is a cross-sectional view of the device for measuring the curvature of a metal bar in the present invention.

[0017] Figure 4 It is a cross-sectional view of the device for measuring the curvature of a metal bar in the present invention.

[0018] Figure 5 for Figure 4 A partial enlarged view of middle A.

[0019] In the figure: 1, workbench; 2, first support member; 3, support wheel; 4, rod; 5, belt; 6, first driving member; 61, fifth wheel; 7, second support member; 71, first wheel; 72, second wheel; 73, first slot; 8, third support member; 81, third wheel; 82, fourth wheel; 9, limit member; 91, first block; 92, first rod; 93, limit block; 931, first surface; 10, detection device; 101, fourth support member; 1011, second slot; 102, rotating member; 103, second driving member; 104, detection member; 105, second block; 106, third block; 1061, third slot; 107, detection head; 1071, fourth block; 108, elastic member; 109, sensor. DETAILED DESCRIPTION

[0020] The embodiment of the present application provides a device for measuring the curvature of a metal bar, thereby solving the problem in the prior art that three sets of measuring rods may result in some parts not being measured, and when measuring bars of different diameters, the bar needs to be moved to the measuring rod and the bar needs to be kept perpendicular to the measuring rod at all times, and the bar needs to be manually rotated to observe where it is bent.

[0021] The technical solution in the embodiment of the present application is to solve the above problems, and the overall idea is as follows

[0022] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1As shown, the metal bar curvature measuring device of this embodiment includes a workbench 1, a first support member 2 arranged on the workbench 1, a support wheel 3 rotating on the first support member 2, a bar 4 rotating on the support wheel 3, a belt 5 driving the bar 4 to rotate, a first driving member 6 driving the belt 5 to rotate, a second support member 7 arranged on the workbench 1, a third support member 8 rotating on the second support member 7, a limit member 9 limiting the position of the third support member 8 on the second support member 7, and a detection device 10 for detecting the curvature of the bar 4; the first support member 2 is provided with two groups on both sides of the second support member 7; the belt 5 presses down the bar 4 and drives the bar 4 to rotate when the belt 5 rotates; the first driving member 6 is arranged on one side of the workbench 1; the limit member 9 is arranged on the third support member 8; the detection device 10 is arranged on the third support member 8; the action end of the detection device 10 is against the side wall of the bar 4.

[0024] The second support member 7 is provided with a first wheel 71 and a second wheel 72; the third support member 8 is provided with a third wheel 81 and a fourth wheel 82; the action end of the first driving member 6 is provided with a fifth wheel 61; the belt 5 sequentially contacts the fifth wheel 61, the second wheel 72, the third wheel 81, the fourth wheel 82, the rod 4 and the first wheel 71; the second wheel 72 is provided at the rotation point between the second support member 7 and the third support member 8; the third wheel 81 is arranged at the highest point of the third support member 8; the fourth wheel 82 is arranged at one end of the third support member 8; the second support member 7 is provided with a first groove 73; when the third support member 8 rotates until the belt 5 fits the rod 4, the fourth wheel 82 is located in the first groove 73.

[0025] The limit member 9 is arranged at one end of the third support member 8; the limit member 9 is located below the fourth wheel 82; the limit member 9 includes a first block 91, a first rod 92 rotating in the first block 91 and a limit block 93 limiting the third support member 8; the limit block 93 is arranged on the end face of the first rod 92; the limit block 93 is cylindrical and a first surface 931 is provided on the side wall of the limit block 93; a gap is left between the first surface 931 and the second support member 7; when the arc-shaped side wall of the limit block 93 contacts the second support member 7, the limit block 93 is interference fit and pressed against the second support member 7; the first block 91 corresponds to the first groove 73.

[0026] The detection device 10 includes a fourth support member 101, a rotating member 102 rotating in the fourth support member 101, a second driving member 103 driving the rotating member 102 to rotate, and a detection member 104 arranged in the fourth support member 101; a second groove 1011 is opened on the fourth support member 101; the rotating member 102 rotates in the second groove 1011; the detection member 104 slides in the second groove 1011; the detection member 104 array is arranged in three groups; two groups of detection members 104 are approached or moved away from each other through the rotating member 102, and one group of detection members 104 is located in the middle of the fourth support member 101 and remains stationary.

[0027] The detection member 104 includes a second block 105, a third block 106 arranged on the second block 105, a detection head 107 sliding on the third block 106, an elastic member 108 that allows the detection head 107 to always press against the side wall of the rod 4, and a sensor 109 for detecting the movement amplitude of the detection head 107; a third groove 1061 is provided on the third block 106; a fourth block 1071 is provided on the detection head 107; the fourth block 1071 slides in the third groove 1061 and the side wall of the fourth block 1071 corresponds to the side wall of the third groove 1061; one end of the elastic member 108 is fixed on the fourth block 1071, and the other end of the elastic member 108 is fixed on the bottom of the third groove 1061; the sensor 109 is arranged on the top of the third groove 1061; the sensor 109 detects the distance between the sensor 109 and the fourth block 1071.

[0028] The workbench 1 is arranged on the ground, and a second support member 7 is arranged in the middle of the workbench 1, and second support members 7 are arranged on both sides of the second support member 7. A support wheel 3 is rotatably connected to the second support member 7, and two groups of support wheels 3 are arranged relatively to each other. A rod 4 is rotatably connected between the two groups of support wheels 3, and the rod 4 rolls on the support wheel 3. The third support member 8 rotates on the second support member 7, and a second wheel 72 is arranged at the connection between the third support member 8 and the second support member 7. A third wheel 81 is arranged on the top wall of the third support member 8, and a fourth wheel 82 is arranged at the end of the third support member 8 away from the second wheel 72. A first groove 73 is opened on the second support member 7, and the first groove 73 corresponds to the fourth wheel 82. The fourth wheel 82 is located in the first groove 73. A first wheel 71 is connected, a first driving member 6 is arranged on the workbench 1, the first driving member 6 is a motor, a fifth wheel 61 is arranged on the action end of the first driving member 6, the fifth wheel 61, the fourth wheel 82, the third wheel 81, the second wheel 72 and the first wheel 71 are in the same plane, the belt 5 contacts the fifth wheel 61, the second wheel 72, the third wheel 81, the fourth wheel 82, the rod 4 and the first wheel 71 in sequence, so that the driving member drives the fifth wheel 61 to rotate and drives the belt 5 to transmit, so that the belt 5 drives the rod 4 to rotate, thereby rotating the rod 4, a detection device 10 is arranged on the workbench 1, a first block 91 is arranged at one end of the third supporting member 8, the first block 91 corresponds to the first groove 73, a first rod 92 is rotatably connected to the first block 91, and the end surface of the first rod 92 A limiting block 93 is provided on the upper surface, which is cylindrical and has a first surface 931 on the side wall of the limiting block 93. A gap is left between the first surface 931 and the second support member 7. When the side wall of the limiting member 9 contacts the second support member 7 in an arc shape, the limiting block 93 is pressed against the side wall of the second support member 7 by interference fit, thereby fixing the position of the second support member 7. The fourth support member 101 is provided on the third support member 8. The fourth support member 101 moves synchronously with the third support member 8. A second groove 1011 is provided on the fourth support member 101. A rotating member 102 is rotatably connected in the second groove 1011. The rotating member 102 is a bidirectional screw. A second driving member 103 is provided on the fourth support member 101. The second driving member 103 drives the rotating member 102 to rotate. The driving member 103 is a motor. A second block 105 is arranged in the second groove 1011. The second block 105 array is arranged in three groups. The second blocks 105 arranged in the left and right groups are respectively threadedly connected to the threads on both sides of the rotating member 102. The rotating member 102 is penetrated by the second block 105 arranged in the middle and there is no transmission connection between the rotating member 102 and the second block 105. A third block 106 is arranged at the bottom of the second block 105. The third block 106 is cylindrical. A third groove 1061 is opened on the third block 106. A fourth block 1071 is slidably connected in the third groove 1061. The fourth block 1071 is in contact with the side wall of the third groove 1061. An elastic member 108 is arranged on the third groove 1061. One end of the elastic member 108 is fixed on the third groove 1061.The other end of the elastic member 108 is fixedly connected to the fourth block 1071. The fourth block 1071 is provided with a detection head 107. The detection head 107 is inserted into the third block 106. The elastic member 108 is sleeved on the detection head 107. The detection head 107 corresponds to the side wall of the rod 4. The top wall of the third groove 1061 is provided with a sensor 109. The sensor 109 detects the distance between the fourth block 1071 and the sensor 109. When the belt 5 drives the rod 4 to rotate, the detection head 107 contacts the side wall of the rod 4. As the rod 4 rotates, it detects whether the rod 4 is bent and its bending angle. After detecting one data, the second driving member 103 is driven to drive the detection devices 10 on both sides to gradually approach to detect the curvature of the rest of the places. At the same time, the center point position of the rod 4 is observed through the detection device 10 in the middle, so that data comparison can be performed.

[0029] Since the workbench 1 is set on the ground, a second support member 7 is set in the middle of the workbench 1, and second support members 7 are set on both sides of the second support member 7. A support wheel 3 is rotatably connected to the second support member 7. Two groups of support wheels 3 are relatively set. A rod 4 is rotatably connected between the two groups of support wheels 3. The rod 4 rolls on the support wheel 3. The third support member 8 rotates on the second support member 7. A second wheel 72 is set at the connection between the third support member 8 and the second support member 7. A third wheel 81 is set on the top wall of the third support member 8. A fourth wheel 82 is set at the end of the third support member 8 away from the second wheel 72. A first groove 73 is opened on the second support member 7. The first groove 73 corresponds to the fourth wheel 82. The fourth wheel 82 is located in the first groove 73. A first wheel 71 is rotatably connected on the upper side, a first driving member 6 is provided on the workbench 1, the first driving member 6 is a motor, a fifth wheel 61 is provided on the action end of the first driving member 6, the fifth wheel 61, the fourth wheel 82, the third wheel 81, the second wheel 72 and the first wheel 71 are in the same plane, the belt 5 contacts the fifth wheel 61, the second wheel 72, the third wheel 81, the fourth wheel 82, the rod 4 and the first wheel 71 in sequence, so that the driving member drives the fifth wheel 61 to rotate and drives the belt 5 to transmit, so that the belt 5 drives the rod 4 to rotate, thereby rotating the rod 4, a detection device 10 is provided on the workbench 1, a first block 91 is provided at one end of the third supporting member 8, the first block 91 corresponds to the first slot 73, a first rod 92 is rotatably connected to the first block 91, and the first rod 92 A limiting block 93 is provided on the end surface thereof, the limiting block 93 is cylindrical and a first surface 931 is provided on the side wall of the limiting block 93, a gap is left between the first surface 931 and the second support member 7, when the side wall of the limiting member 9 contacts the second support member 7 in an arc shape, the limiting block 93 is pressed against the side wall of the second support member 7 by interference fit, thereby fixing the position of the second support member 7, the fourth support member 101 is provided on the third support member 8, the fourth support member 101 moves synchronously with the third support member 8, a second groove 1011 is provided on the fourth support member 101, a rotating member 102 is rotatably connected in the second groove 1011, the rotating member 102 is a bidirectional screw, a second driving member 103 is provided on the fourth support member 101, the second driving member 103 drives the rotating member 102 to rotate, the fourth support member 101 is provided with a second driving member 103, the second driving member 103 drives the rotating member 102 to rotate, The second driving member 103 is a motor. A second block 105 is arranged in the second groove 1011. The second block 105 array is arranged in three groups. The second blocks 105 arranged in the left and right groups are respectively threadedly connected to the threads on both sides of the rotating member 102. The rotating member 102 is penetrated by the second block 105 arranged in the middle and there is no transmission connection between the rotating member 102 and the second block 105. A third block 106 is arranged at the bottom of the second block 105. The third block 106 is cylindrical. A third groove 1061 is opened on the third block 106. A fourth block 1071 is slidably connected in the third groove 1061. The fourth block 1071 is fitted with the side wall of the third groove 1061. An elastic member 108 is arranged on the third groove 1061. One end of the elastic member 108 is fixed on the third groove 1061.The other end of the elastic member 108 is fixedly connected to the fourth block 1071. The fourth block 1071 is provided with a detection head 107. The detection head 107 is inserted into the third block 106. The elastic member 108 is sleeved on the detection head 107. The detection head 107 corresponds to the side wall of the rod 4. The top wall of the third groove 1061 is provided with a sensor 109. The sensor 109 detects the distance between the fourth block 1071 and the sensor 109. When the belt 5 drives the rod 4 to rotate, the detection head 107 contacts the side wall of the rod 4. As the rod 4 rotates, Detect whether the bar 4 is bent and its bending angle. After detecting one data, drive the second driving member 103 to drive the detection devices 10 on both sides to gradually approach and detect the bending degree of the rest of the places. At the same time, observe the center point position of the bar 4 through the detection device 10 in the middle, so that data comparison can be carried out, and then the bar 4 is driven to rotate by the belt 5. At the same time, the stretchable nature of the belt 5 makes it possible to apply bars 4 of different diameters. At the same time, the detection device 10 can stay at any position of the bar 4, so that the data is complete.

[0030] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0031] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A device for measuring the curvature of a metal bar, characterized in that: The invention comprises a workbench (1), a first support member (2) arranged on the workbench (1), a support wheel (3) rotating on the first support member (2), a rod (4) rotating on the support wheel (3), a belt (5) driving the rod (4) to rotate, a first driving member (6) driving the belt (5) to rotate, a second support member (7) arranged on the workbench (1), a third support member (8) rotating on the second support member (7), and a limiting member (9) limiting the position of the third support member (8) on the second support member (7). and a detection device (10) for detecting the curvature of the rod (4); the first support member (2) is provided with two groups on both sides of the second support member (7); the belt (5) presses down the rod (4) and drives the rod (4) to rotate when the belt (5) rotates; the first driving member (6) is arranged on one side of the workbench (1); the limit member (9) is arranged on the third support member (8); the detection device (10) is arranged on the third support member (8); the action end of the detection device (10) abuts against the side wall of the rod (4).

2. The metal bar curvature measuring device according to claim 1, characterized in that: The second support member (7) is provided with a first wheel (71) and a second wheel (72); the third support member (8) is provided with a third wheel (81) and a fourth wheel (82); the action end of the first driving member (6) is provided with a fifth wheel (61); the belt (5) contacts the fifth wheel (61), the second wheel (72), the third wheel (81), the fourth wheel (82), the rod (4) and the first wheel (71) in sequence; the second wheel (72) is provided at the rotation point between the second support member (7) and the third support member (8); the third wheel (81) is provided at the highest point of the third support member (8); the fourth wheel (82) is provided at one end of the third support member (8); the second support member (7) is provided with a first groove (73); when the third support member (8) rotates until the belt (5) is in contact with the rod (4), the fourth wheel (82) is located in the first groove (73).

3. The device for measuring the curvature of a metal bar according to claim 2, characterized in that: The limiting member (9) is arranged at one end of the third supporting member (8); the limiting member (9) is located below the fourth wheel (82); the limiting member (9) comprises a first block (91), a first rod (92) rotating in the first block (91) and a limiting block (93) limiting the third supporting member (8); the limiting block (93) is arranged on the end surface of the first rod (92); the limiting block (93) is cylindrical and a first surface (931) is provided on the side wall of the limiting block (93); a gap is left between the first surface (931) and the second supporting member (7); when the arc-shaped side wall of the limiting block (93) contacts the second supporting member (7), the limiting block (93) is pressed on the second supporting member (7) by interference fit; the first block (91) corresponds to the first groove (73).

4. The device for measuring the curvature of a metal bar according to claim 1, characterized in that: The detection device (10) comprises a fourth support member (101), a rotating member (102) rotating in the fourth support member (101), a second driving member (103) driving the rotating member (102) to rotate, and a detection member (104) arranged in the fourth support member (101); a second groove (1011) is provided on the fourth support member (101); the rotating member (102) rotates in the second groove (1011); the detection member (104) slides in the second groove (1011); the detection member (104) array is arranged in three groups; two groups of the detection members (104) are moved closer to or farther from each other through the rotating member (102), and one group of the detection members (104) is located in the middle of the fourth support member (101) and remains stationary.

5. The device for measuring the curvature of a metal bar according to claim 4, characterized in that: The detection member (104) comprises a second block (105), a third block (106) arranged on the second block (105), a detection head (107) sliding on the third block (106), an elastic member (108) for making the detection head (107) always press against the side wall of the rod (4), and a sensor (109) for detecting the movement amplitude of the detection head (107); a third groove (1061) is provided on the third block (106); a fourth block (1071) is provided on the detection head (107); the fourth block (1071) slides in the third groove (1061) and the side wall of the fourth block (1071) corresponds to the side wall of the third groove (1061); one end of the elastic member (108) is fixed on the fourth block (1071), and the other end of the elastic member (108) is fixed to the bottom of the third groove (1061); the sensor (109) is arranged at the top of the third groove (1061); the sensor (109) detects the distance between the sensor (109) and the fourth block (1071).

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