A steel wire linear dimension measuring machine

Abstract

The application discloses a reinforcing steel bar linear size measuring machine, and belongs to the technical field of reinforcing steel bar detection.The reinforcing steel bar linear size measuring machine comprises a driving unit, a measuring unit and a discharging unit.The driving unit comprises a first rotating motor and a rotating roller connected to the output end of the first rotating motor.The measuring unit is arranged in the axial direction of the rotating roller in sequence and comprises an L-shaped table, an end measuring plate vertically arranged at one end of the vertical part of the L-shaped table, a diameter measuring assembly, a first linear mechanism, a first measuring device and a first control box, a second linear mechanism, a second measuring device arranged at the output end of the second linear mechanism, a second control box arranged at the upper end of the second linear mechanism, a second rotating motor arranged at the lower end of the horizontal part of the L-shaped table, and a closing plate arranged at the output end of the second rotating motor.The discharging unit comprises a second screw module and a discharging assembly, and the discharging assembly comprises a storage frame and a third linear mechanism.The reinforcing steel bar linear size measuring machine can automatically measure the linear size of reinforcing steel bars in batches, saves labor consumption, and has good universality.

Description

Technical Field

[0001] This invention relates to the field of steel bar inspection technology, and in particular to a steel bar linear dimension measuring machine. Background Technology

[0002] Steel bars are typically combined with concrete to form reinforced concrete members. The superior tensile strength of the steel bars compensates for the insufficient tensile strength of the concrete, and together they bear the load. They play a skeletal, core role in all civil engineering projects, including modern buildings, bridges, and roads, and their dimensions and performance directly determine the safety and durability of the structure.

[0003] After steel reinforcement is produced, diameter and length deviations sometimes occur. The main reasons include: wear of the rolling mill rolls, uneven temperature, unstable tension control, and uneven cooling during the rolling process, which directly leads to differences in diameter at different locations on the steel reinforcement. Meanwhile, errors in subsequent length cutting, springback during bending, and deformation caused by transportation and hoisting are the main sources of length deviations. These dimensional deviations directly affect the cross-sectional area and theoretical weight of the steel reinforcement, thereby weakening its load-bearing capacity and posing a potential threat to engineering safety.

[0004] Therefore, after the steel bars are produced, their linear dimensions need to be measured, among which the most important are the length and diameter. However, currently these measurements are usually done manually, using calipers to measure the diameter at multiple locations, and the measured values ​​need to be calculated. When measuring the length of the steel bars, the length varies depending on the application scenario. Currently, the measurement is done with a measuring tape. For some longer steel bars, it is necessary to measure them in sections to complete the measurement of the entire steel bar. This method increases the cumulative error of the measurement, is inefficient, and is even more time-consuming when there are many steel bars to be measured or many diameter measurement points. Summary of the Invention

[0005] To address the aforementioned shortcomings, this invention provides a rebar linear dimension measuring machine that can automatically perform batch measurements of rebar linear dimensions, saving manpower and possessing good versatility.

[0006] In order to achieve the objectives of this invention, the following technologies are proposed:

[0007] A linear dimension measuring machine for reinforcing bars, comprising:

[0008] The drive unit includes a first rotary motor and a rotating roller connected to its output end;

[0009] Multiple measuring units are arranged sequentially along the axis of the rotating roller. Each measuring unit includes an L-shaped platform located on the upper end of the outer periphery of the rotating roller. One end of the platform has a vertical end measuring plate, and one side of the end measuring plate has an adjustment plate that is parallel to the horizontal part of the L-shaped platform. Multiple diameter measuring components are assembled at the lower end of the adjustment plate along its length.

[0010] The feeding unit includes a second lead screw module located at one end of the measuring unit and a feeding assembly located above the measuring unit. The feeding assembly includes a storage frame located on one side of the sliding end of the second lead screw module for placing steel bars. The storage frame is open at both the top and bottom ends, and a third linear mechanism is provided on one side of the storage frame. Its output end is provided with an L-shaped plate.

[0011] The diameter measuring component includes a first linear mechanism with a side push plate at its output end. A first through groove is opened on the side of the side push plate, and a first measuring device is fixed inside it. A first control box electrically connected to the first measuring device is installed on the upper end of the first linear mechanism. A first lead screw module is provided on the outer side of the vertical part of the L-shaped platform. A second linear mechanism is provided on the upper surface of the horizontal part of the L-shaped platform at its sliding end. An end push plate is provided at its output end. A second through groove is opened on one end of the side of the end push plate, and a second measuring device is fixed inside it. A second control box electrically connected to the second measuring device is provided on the upper end of the second linear mechanism. A second rotary motor is provided at the lower end of the horizontal part of the L-shaped platform, and a closed plate is provided at its output end.

[0012] Furthermore, the drive unit also includes a rotating base, with one end of the roller rotatably engaged with the rotating base.

[0013] Furthermore, the adjustment plate has multiple vertical through holes along its length, and the upper surface of the first control box has a pair of screw holes. During assembly, two first screws are inserted into the vertical through holes and threaded into the screw holes, so that the diameter measuring component is fixed to the lower end of the adjustment plate.

[0014] Furthermore, the first control box contains a controller and a handle is provided at the top of the first control box. The second control box contains a controller. The controller in the first control box is used to receive measurement commands, control the first linear mechanism, and transmit and store the measurement data of the first measuring instrument. The controller in the second control box is used to receive measurement commands, control the second linear mechanism, and transmit and store the measurement data of the second measuring instrument.

[0015] Furthermore, the vertical part of the L-shaped platform is provided with a sliding groove along its length. The first lead screw module includes a first drive motor and a first support base installed on the vertical part of the L-shaped platform. The output end of the first drive motor is provided with a first lead screw that is rotatably engaged with the first support base. The outer periphery of the first lead screw is provided with a first slide table that moves along the axis of the first lead screw during operation. One side of the first slide table is provided with a slider that is slidably engaged with the sliding groove. The second linear mechanism is provided on one side of the slider.

[0016] Furthermore, the lower end of the horizontal part of the L-shaped platform is provided with a base plate, and a circular hole with an inner diameter matching the diameter of the rotating roller is opened on the side of the base plate, and the rotating roller is fixedly inserted through the circular hole.

[0017] Furthermore, the second lead screw module includes a second drive motor and a second support base. The output end of the second drive motor is provided with a second lead screw that is rotatably engaged with the second support base. A second slide is provided on the outer periphery of the second lead screw that moves along the axis of the second lead screw during operation. A storage frame is provided on one side of the second slide.

[0018] Furthermore, multiple horizontal through holes are provided on both sides of the storage frame. The horizontal through holes are used to insert a second screw through one side of the storage frame and fix the second screw through a nut from the other side. A limit plate is installed inside the storage frame. During operation, the limit plate is located between the steel bar and the second screw inside the storage frame. A pair of inverted L-shaped blocks are symmetrically provided at the upper end of the limit plate. The U-shaped part formed between the vertical part of the inverted L-shaped block and the limit plate is slidably engaged with the upper end of one side plate of the storage frame.

[0019] Furthermore, the feeding unit also includes a support assembly, which includes an inverted L-shaped frame fixed to one end of the storage frame. The lower end of the vertical part of the inverted L-shaped frame is provided with a carriage, and the lower end of the carriage is provided with several rollers.

[0020] The beneficial effects of this technical solution are as follows:

[0021] 1. This linear dimension measuring machine for reinforcing bars can simultaneously measure the length and diameter of multiple reinforcing bars at different locations, and can automatically complete the measurement of a large number of reinforcing bars in batches, which can significantly reduce manpower consumption and improve measurement efficiency.

[0022] 2. Depending on the specifications of the reinforcing bars, namely the standard length and diameter of the reinforcing bars, as well as the required number of diameter measurement points, the number and position of the diameter measurement components, as well as the starting position of the end push plate, can be flexibly adjusted. When preparing for the storage of reinforcing bars, the position of the reinforcing bars being limited can also be adjusted, and the reinforcing bars can be automatically placed on the measurement unit, which has good versatility. Attached Figure Description

[0023] Figure 1 The overall three-dimensional representation of the embodiment of this application is shown. Figure 1 .

[0024] Figure 2 The overall three-dimensional representation of the embodiment of this application is shown. Figure 2 .

[0025] Figure 3 The three-dimensional measurement unit of the embodiment of this application is shown. Figure 1 .

[0026] Figure 4 The three-dimensional measurement unit of the embodiment of this application is shown. Figure 2.

[0027] Figure 5 The three-dimensional measurement unit of the embodiment of this application is shown. Figure 3 .

[0028] Figure 6 A partial perspective view of the measurement unit according to an embodiment of this application is shown.

[0029] Figure 7 A partial exploded view of the measurement unit according to an embodiment of this application is shown.

[0030] Figure 8 A perspective view of the feeding unit according to an embodiment of this application is shown.

[0031] Figure 9 An exploded view of the feeding assembly according to an embodiment of this application is shown.

[0032] The diagram shows: Drive unit 1, first rotary motor 11, roller 12, first support 13, rotating seat 14, measuring unit 2, L-shaped stage 21, end measuring plate 211, slide 212, second support 213, adjusting plate 22, vertical through hole 221, first linear mechanism 23, side push plate 231, first through groove 232, first measuring device 233, first control box 24, screw hole 241, first screw 242, handle 243, first cable 244, first drive motor 25, first support seat 251, first lead screw 252, first slide table 253, slider 254, second linear mechanism 26, end push plate 261, and so on. 262, second through slot, second measuring device, second control box, second cable, second cable, base plate, round hole, L-shaped frame, second rotary motor, second sealing plate, second feeding unit, second drive motor, second support seat, second lead screw, second slide, third bracket, fourth bracket, storage frame, horizontal through hole, second screw, nut, limit plate, inverted L-shaped block, hanging plate, third linear mechanism, L-shaped plate, T-shaped plate, inverted L-shaped frame, car body, roller, steel bar, and reinforcing bar. Detailed Implementation

[0033] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0034] like Figures 1-9 The illustrated linear dimension measuring machine for reinforcing bars includes a drive unit 1, a measuring unit 2, and a feeding unit 3.

[0035] like Figure 1 , Figure 2As shown, the drive unit 1 includes a first rotary motor 11, the output end of which is connected to a rotating roller 12. The drive unit 1 also includes a first bracket 13 and a rotating seat 14. The first rotary motor 11 is mounted on the first bracket 13, and one end of the rotating roller 12 is rotatably engaged with the rotating seat 14. Specifically, both the first bracket 13 and the rotating seat 14 are mounted on the ground.

[0036] like Figures 1-7As shown, there are multiple measuring units 2 arranged sequentially along the axis of the rotating roller 12. Each measuring unit 2 includes an L-shaped platform 21 located on the upper outer periphery of the rotating roller 12. An end measuring plate 211 is vertically mounted on one end of the vertical portion of the L-shaped platform 21. A groove 212 is formed along the length of the vertical portion of the L-shaped platform 21. A second support 213 is provided on the upper surface of the horizontal portion of the L-shaped platform 21. An adjusting plate 22, parallel to the horizontal portion of the L-shaped platform 21, is vertically mounted on one side of the end measuring plate 211. One end of the lower surface of the adjusting plate 22 is fixed to the upper end of the second support 213. Multiple vertical through holes 221 are sequentially formed along the length of the adjusting plate 22. Multiple diameter measuring components are assembled along the length of the lower end of the adjusting plate 22. Each diameter measuring component includes a first linear mechanism 23, whose output end is provided with... A side push plate 231 has a first through groove 232 on its side, in which a first measuring device 233 is fixed. A first control box 24 is mounted on the upper end of the first linear mechanism 23, and a controller is provided in the first control box 24. The controller is used to receive measurement commands, control the first linear mechanism 23, and transmit and store the measurement data of the first measuring device 233. A pair of screw holes 241 are provided on the upper surface of the first control box 24. During assembly, two first screws 242 are sequentially inserted into the vertical through hole 221 and threaded into the screw holes 241, so that the diameter measuring component is fixed to the lower end of the adjusting plate 22. A handle 243 is provided on the upper end of the first control box 24, and one end of the first control box 24 is connected to the first measuring device 233. The first cable 244, the outer side of the vertical part of the L-shaped platform 21 is provided with a first lead screw module, the first lead screw module includes a first drive motor 25 and a first support base 251 installed on the vertical part of the L-shaped platform 21, the output end of the first drive motor 25 is provided with a first lead screw 252 rotatably engaged with the first support base 251, the outer periphery of the first lead screw 252 is provided with a first slide 253 that moves along the axis of the first lead screw 252 during operation, one side of the first slide 253 is provided with a slider 254 slidably engaged with the slide groove 212, one side of the slider 254 is provided with a second linear mechanism 26 located on the upper end face of the horizontal part of the L-shaped platform 21, its output end is provided with an end push plate 261, one end of the side of the end push plate 261 is provided with a second through groove 262, the second through groove 262 is fixed in the first linear mechanism 264. The second measuring instrument 263 has a second control box 27 at its upper end. The second control box 27 also contains a controller for receiving measurement commands, controlling the second linear mechanism 26, and transmitting and storing measurement data from the second measuring instrument 263. One end of the second control box 27 is connected to a second cable 271 for the second measuring instrument 263. The lower end of the horizontal section of the L-shaped platform 21 has a base plate 28. The side of the base plate 28 has a circular hole 281 with an inner diameter matching that of the rotating roller 12. The rotating roller 12 is fixedly inserted through the circular hole 281. Specifically, the rotating roller 12 and the base plate 28 can be fixed by welding. The lower end of the horizontal section of the L-shaped platform 21 also has an L-shaped frame 29. One end of the horizontal section of the L-shaped frame 29 has a second rotary motor 291.Its output end is equipped with a sealing plate 292, which is used to abut one end of the tested reinforcing bar 4 when rotated upwards to a vertical position, and to allow the reinforcing bar 4 to be unloaded when rotated downwards to a vertical position.

[0037] like Figure 1 , Figure 2 , Figure 8 , Figure 9 As shown, the feeding unit 3 includes a second lead screw module located at one end of the measuring unit 2, a feeding assembly located above the measuring unit 2, and a support assembly located at the other end of the measuring unit 2. The second lead screw module includes a second drive motor 31 and a second support base 311. The output end of the second drive motor 31 is provided with a second lead screw 312 rotatably engaged with the second support base 311. A second slide 313 is provided on the outer periphery of the second lead screw 312, which moves along the axis of the second lead screw 312 during operation. The second lead screw module also includes... The assembly includes a third support 314 and a fourth support 315. A second drive motor 31 is located on the upper end of the third support 314, and a second support base 311 is located on one side of the fourth support 315. The feeding assembly includes a storage frame 32 located on one side of the second slide table 313. The storage frame 32 has openings at both the top and bottom. During operation, multiple steel bars 4 are placed vertically inside the storage frame 32. Multiple horizontal through holes 33 are provided on both sides of the storage frame 32. The horizontal through holes 33 are used to insert a second screw 331 through one side of the storage frame 32. The second screw 331 is fixed from the other side by a nut 332. A limit plate 34 is installed inside the storage frame 32. During operation, the limit plate 34 is located between the steel bar 4 and the second screw 331 inside the storage frame 32. A pair of inverted L-shaped blocks 341 are symmetrically provided on the upper end of the limit plate 34. The U-shaped part formed between the vertical part of the inverted L-shaped block 341 and the limit plate 34 slides in fit with the upper end of one side plate of the storage frame 32. A hanging plate 35 is provided on one side of the storage frame 32. A third linear mechanism 36 is provided at the lower end of the hanging plate 35. Its output end is provided with an L-shaped plate 361. The horizontal part of the L-shaped plate 361 is used to open or close a portion of the lower opening of the storage frame 32. Specifically, one end of the hanging plate 35 is also provided with a T-shaped groove that extends along its length and penetrates the lower end surface of the hanging plate 35. The upper end of the vertical part of the L-shaped plate 361 is provided with a T-shaped part 362 that slides into the T-shaped groove. The support assembly includes an inverted L-shaped frame 37 fixed to one end of the storage frame 32. The lower end of the vertical part of the inverted L-shaped frame 37 is provided with a vehicle body 38. The lower end of the vehicle body 38 is provided with several rollers 39.

[0038] In this embodiment, the first linear mechanism 23, the second linear mechanism 26, and the third linear mechanism 36 all adopt single-axis linear cylinders, the first measuring device 233 and the second measuring device 263 both adopt laser rangefinders, and the controllers in the first control box 24 and the second control box 27 both include processors, memory, and communication modules. The communication module is used to communicate with a measurement terminal, receive measurement instructions, and send measurement data.

[0039] Work style:

[0040] First, based on the predetermined length of the reinforcing bar 4 to be tested, which is the length of the standard product, the position of the limiting plate 34 is adjusted so that the distance from one side of it to the inner end face of the storage frame 32 is a few centimeters longer than the aforementioned length. Then, the second screw 331 and nut 332 are used for limiting. Then, the L-shaped plate 361 is pushed by the third linear mechanism 36 to close the lower opening of the storage frame 32. Then, the reinforcing bar 4 is placed in the storage frame 32. Preferably, the storage frame 32 can be filled.

[0041] Next, each measuring unit 2 is set up. Specifically, based on the standard length of the reinforcing bar 4, the position of its sliding end is moved by the first lead screw module. The reason for using the first lead screw module is that, on the one hand, even if the length of the reinforcing bar 4 is not up to standard after production, it will generally not be much longer or shorter than the standard length, at most a few centimeters of error. On the other hand, since the reinforcing bar 4 needs to be pressed during measurement, but it is difficult to push the reinforcing bar axially, and the measuring unit 2 can be tilted as a whole, it is not necessary to use the second linear mechanism 26 to perform the pressing. Instead, by tilting the measuring unit 2, the reinforcing bar 4 is pressed against one side of the closed plate 292 by gravity. Therefore, before starting, it is sufficient to move a second linear mechanism 26 with a short stroke by the first lead screw module, instead of using a second linear mechanism 26 with a long stroke. The number, position and spacing of the diameter measuring components to be assembled are determined by the standard length of the reinforcing bar 4 and the number of test points required. For example, in this embodiment, the following is attached. Figure 3 As can be seen, this measurement requires each measurement unit 2 to use four diameter measuring components, two of which are close to the two ends of the reinforcing bar 4, and the other two diameter measuring components are between the two diameter measuring components. Each diameter measuring component can measure the diameter of the reinforcing bar 4, and can also be used to evaluate whether there is any unevenness in the diameter of the reinforcing bar 4.

[0042] Then, the feeding assembly is moved sequentially above each L-shaped platform 21 by the second lead screw module. When it reaches each L-shaped platform 21, the end push plate 261 is retracted and pushed out by the second linear mechanism 26, so that a steel bar 4 falls between the side push plate 231, the end push plate 261, the closing plate 292 and the vertical part of the L-shaped platform 21. After feeding is completed, the feeding assembly is moved away from the measuring unit 2 to avoid collision when the measuring unit 2 rotates.

[0043] Then, the first rotary motor 11 rotates all the measuring units 2, causing the steel bar 4 to slide down along its own axis toward the closed plate 292. All the first linear mechanisms 23 push the side push plates 231 respectively, so that the side push plates 231 press the steel bar 4. The distance between the sensing surface of the first measuring device 233 and the inner side of the vertical part of the L-shaped platform 21 is the diameter of the steel bar 4 at the measured position. At the same time, the second linear mechanism 26 pushes the end push plate 261, so that the end push plate 261 abuts against one end of the steel bar 4. The distance between the sensing surface of the second measuring device 263 and the end measuring plate 211 is the length of the steel bar 4 being measured.

[0044] After the test is completed, the side push plate 231 is released from pressing on the steel bar 4. Then, the closing plate 292 is rotated by the second rotary motor 291, allowing the steel bar 4 to be unloaded from one end of the measuring unit 2. Specifically, during unloading, the material can be received manually, transported by a conveyor belt at the unloading point, or received by a trolley, depending on the actual production convenience.

[0045] By repeating the above feeding and measurement process, the linear dimensions of all steel bars in the storage box 32 can be measured in batches.

[0046] The above are only some of the embodiments listed in this application and are not intended to limit this application.

Claims

1. A linear dimension measuring machine for reinforcing bars, characterized in that, include: The drive unit (1) includes a first rotary motor (11) and a rotating roller (12) connected to its output end. Multiple measuring units (2) are arranged sequentially along the axis of the rotating roller (12). The measuring unit (2) includes an L-shaped platform (21) located on the upper end of the outer periphery of the rotating roller (12). One end of its vertical part is provided with an end measuring plate (211). One side of the end measuring plate (211) is provided with an adjustment plate (22) parallel to the horizontal part of the L-shaped platform (21). Multiple diameter measuring components are assembled at the lower end of the adjustment plate (22) along its length. The feeding unit (3) includes a second lead screw module located at one end of the measuring unit (2) and a feeding assembly located above the measuring unit (2). The feeding assembly includes a storage frame (32) located on one side of the sliding end of the second lead screw module for placing steel bars. The storage frame (32) has openings at both the top and bottom ends. A third linear mechanism (36) is provided on one side of the storage frame (32), and its output end is provided with an L-shaped plate (361). The diameter measuring component includes a first linear mechanism (23), whose output end is provided with a side push plate (231), the side of the side push plate (231) is provided with a first through groove (232), and a first measuring device (233) is fixed inside it. The upper end of the first linear mechanism (23) is provided with a first control box (24) electrically connected to the first measuring device (233). The outer side of the vertical part of the L-shaped platform (21) is provided with a first lead screw module, and its sliding end is provided with a second linear mechanism (26) located on the upper end of the horizontal part of the L-shaped platform (21). Its output end is provided with an end push plate (261), and one end of the side of the end push plate (261) is provided with a second through groove (262), and a second measuring device (263) is fixed inside it. The upper end of the second linear mechanism (26) is provided with a second control box (27) electrically connected to the second measuring device (263). The lower end of the horizontal part of the L-shaped platform (21) is provided with a second rotary motor (291), and its output end is provided with a sealing plate (292).

2. The linear dimension measuring machine for reinforcing bars according to claim 1, characterized in that, The drive unit (1) also includes a rotating seat (14), with one end of the roller (12) rotatably engaged with the rotating seat (14).

3. The linear dimension measuring machine for reinforcing bars according to claim 1, characterized in that, The adjustment plate (22) has multiple vertical through holes (221) sequentially along its length. The upper surface of the first control box (24) has a pair of screw holes (241). During assembly, two first screws (242) are sequentially inserted into the vertical through holes (221) and threadedly connected to the screw holes (241), so that the diameter measuring component is fixed at the lower end of the adjustment plate (22).

4. The linear dimension measuring machine for reinforcing bars according to claim 1, characterized in that, The first control box (24) is equipped with a controller and a handle (243) is provided at the top of the first control box (24). The second control box (27) is equipped with a controller. The controller in the first control box (24) is used to receive measurement instructions, control the first linear mechanism (23), and transmit and store the measurement data of the first measuring instrument (233). The controller in the second control box (27) is used to receive measurement instructions, control the second linear mechanism (26), and transmit and store the measurement data of the second measuring instrument (263).

5. The linear dimension measuring machine for reinforcing bars according to claim 1, characterized in that, The vertical part of the L-shaped platform (21) is provided with a slide groove (212) along its length direction. The first lead screw module includes a first drive motor (25) and a first support base (251) installed on the vertical part of the L-shaped platform (21). The output end of the first drive motor (25) is provided with a first lead screw (252) rotatably engaged with the first support base (251). The outer periphery of the first lead screw (252) is provided with a first slide (253) that moves along the axis of the first lead screw (252) during operation. One side of the first slide (253) is provided with a slider (254) slidably engaged with the slide groove (212). The second linear mechanism (26) is provided on one side of the slider (254).

6. The linear dimension measuring machine for reinforcing bars according to claim 1, characterized in that, The lower end of the horizontal part of the L-shaped platform (21) is provided with a base plate (28). The side of the base plate (28) is provided with a round hole (281) with an inner diameter matching the diameter of the rotating roller (12). The rotating roller (12) is fixedly inserted through the round hole (281).

7. The linear dimension measuring machine for reinforcing bars according to claim 1, characterized in that, The second lead screw module includes a second drive motor (31) and a second support base (311). The output end of the second drive motor (31) is provided with a second lead screw (312) that is rotatably engaged with the second support base (311). The outer periphery of the second lead screw (312) is provided with a second slide (313) that moves along the axis of the second lead screw (312) during operation. The storage frame (32) is located on one side of the second slide (313).

8. The linear dimension measuring machine for reinforcing bars according to claim 1, characterized in that, Multiple horizontal through holes (33) are provided on both sides of the storage frame (32). The horizontal through holes (33) are used to insert a second screw (331) from one side of the storage frame (32) and fix the second screw (331) from the other side through a nut (332). A limit plate (34) is installed inside the storage frame (32). When working, the limit plate (34) is located between the steel bar (4) and the second screw (331) inside the storage frame (32). A pair of inverted L-shaped blocks (341) are symmetrically provided on the upper end of the limit plate (34). The U-shaped part formed between the vertical part of the inverted L-shaped block (341) and the limit plate (34) slides and engages with the upper end of one side plate of the storage frame (32).

9. The linear dimension measuring machine for reinforcing bars according to claim 1, characterized in that, The feeding unit (3) also includes a support assembly, which includes an inverted L-shaped frame (37) fixed to one end of the storage frame (32). The lower end of the vertical part of the inverted L-shaped frame (37) is provided with a car body (38), and the lower end of the car body (38) is provided with several rollers (39).

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