A kind of on-line detection device for rake face wear of shearing blade of block shearing machine

Abstract

The application discloses a shearing blade rake face wear online detection device of a block shearing machine, which comprises a fixed blade detection reference plate arranged at the side surface of an upper tool holder where a moving blade is arranged, a center air hole opened at the front center position of the fixed blade detection reference plate, a first constant pressure gas supply pipeline connected with the center air hole from the back side of the fixed blade detection reference plate, and a first gas flow sensor arranged on the first constant pressure gas supply pipeline; the fixed blade detection reference plate is located above the moving blade at the side surface of the upper tool holder, the front surface of the fixed blade detection reference plate is located on the shearing plane formed by the mutual shearing of the moving blade and the fixed blade, and the first gas flow sensor is connected with the control system of the block shearing machine; wherein the front surface of the fixed blade detection reference plate is the surface far from the side surface of the upper tool holder. The application realizes online automatic monitoring of the shearing blade rake face wear, and further improves the working reliability of the block shearing machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shearing machines, in particular to a shearing blade rake face wear online detection device of a block shearing machine. BACKGROUND

[0002] A shearing machine is a mechanical device for shearing scrap steel. By shearing recycled scrap steel into uniform materials, it greatly facilitates the recycling of scrap steel.

[0003] According to the types and specifications of the materials to be sheared, different types of shearing machines are usually required. Block shearing machines belong to one type of shearing machines, which mainly include a block shearing component and a feeding component matched with the block shearing component. The block shearing component is arranged on a horizontal guide rail and can move horizontally (i.e. perpendicular to the feeding direction), and the block shearing component is provided with an upper knife holder and a lower knife holder capable of shearing up and down. The shearing blades on the upper knife holder and the lower knife holder are both L-shaped shearing blades. During operation, the L-shaped shearing blade on the lower knife holder is fixed, the feeding component feeds the scrap steel to be sheared onto the lower knife holder, the L-shaped shearing blade is moved downward by the downward movement of the upper knife holder, and the L-shaped shearing blade is sheared up and down to shear the scrap steel into smaller rectangular blocks. After each block is sheared, the block shearing component moves a certain interval along the horizontal guide rail to continue cutting the remaining part of the scrap steel on the lower knife holder. After the scrap steel on the lower knife holder is completely sheared, the block shearing component moves back to the original position, and then the feeding component feeds again and the block shearing component repeats the above shearing action to realize continuous block shearing of the block shearing machine. In order to improve the reliability of shearing work, a pressing mechanism is usually arranged on the block shearing component to press the scrap steel to be sheared tightly before each cutting.

[0004] The above block shearing machine has the following problems in use: due to the working mode of the block shearing machine, the shearing blade works at a high frequency, and due to the large cutting force and impact of the shearing operation, combined with the fact that the scrap steel to be sheared may be difficult to machine and the irregular shape of the scrap steel, the working conditions of the shearing blade are poor, which easily leads to wear and failure of the shearing blade. In particular, the rake face of the shearing blade will produce strong friction with the scrap steel during shearing, and the wear rate is fast. When the rake face of the shearing blade is worn seriously, it needs to be replaced in time, otherwise the working condition of the shearing blade will be seriously deteriorated, and the service life of the entire block shearing machine may be damaged.

[0005] At present, the judgment of the wear condition of the rake face of the shearing blade on the shearing machine mainly relies on the periodic observation of the shearing blade by the operating personnel, and the judgment is based on experience, and there is a possibility of missed detection and false detection. Therefore, developing a device capable of realizing online automatic monitoring of the wear of the rake face of the shearing blade is a technical problem to be solved by the person skilled in the art. SUMMARY

[0006] In order to solve the above problems, the present application provides a shearing blade rake face wear online detection device of a block shearing machine, which aims to realize online automatic monitoring of the wear of the rake face of the shearing blade, and further improve the working reliability of the block shearing machine. The specific technical solutions are as follows:

[0007] A shearing blade rake face wear online detection device of a block shearing machine, the block shearing machine comprising a shearing platform, a single-arm gantry arranged above the shearing platform and connected with the shearing platform, a lower knife seat arranged on the shearing platform, a fixed blade arranged on the upper side of the lower knife seat, an upper knife seat arranged on the single-arm gantry and movable up and down, and a moving blade arranged on the lower side of the upper knife seat; when the upper knife seat moves downward, the moving blade of the upper knife seat and the fixed blade on the lower knife seat form a mutual shearing movement in the vertical direction, and the rake face of the moving blade and the rake face of the fixed blade face each other in the state of mutual shearing; the shearing blade rake face wear online detection device comprises a fixed blade wear detection device for detecting the wear of the rake face of the fixed blade, the fixed blade wear detection device comprising a fixed blade detection reference plate arranged on the side of the upper knife seat where the moving blade is arranged, a center air hole opened in the center position of the front surface of the fixed blade detection reference plate, a first constant pressure gas supply pipeline connected with the center air hole from the back side of the fixed blade detection reference plate, and a first gas flow sensor arranged on the first constant pressure gas supply pipeline; the fixed blade detection reference plate is located above the moving blade on the side of the upper knife seat, the front surface of the fixed blade detection reference plate is located on the shearing plane formed by the mutual shearing of the moving blade and the fixed blade, and the first gas flow sensor is connected with the control system of the block shearing machine; wherein the front surface of the fixed blade detection reference plate is the surface away from the side of the upper knife seat.

[0008] In the present application, the shear blade rake face wear online detection device further comprises a movable blade wear detection device for detecting the wear of the movable blade rake face, the movable blade wear detection device comprises a movable blade detection reference plate arranged at the inner side of the upper part of the single-arm gantry, a central air passage hole opened at the front center of the movable blade detection reference plate, a second constant pressure air supply pipeline connected with the central air passage hole from the back side of the movable blade detection reference plate, and a second gas flow sensor arranged on the second constant pressure air supply pipeline and connected with the control system, and the front surface of the movable blade detection reference plate is located on the shear plane formed by the movable blade and the fixed blade.

[0009] In the present application, the fixed blade is an L-shaped fixed blade, the L-shaped fixed blade comprises a pair of rectangular blades which are vertically butted, and the pair of rectangular blades are arranged on two adjacent and perpendicular lower tool holder side surfaces of the lower tool holder respectively; and the fixed blade detection reference plate comprises a pair of rectangular plates which are vertically butted, and the pair of rectangular plates are arranged on two adjacent and perpendicular upper tool holder side surfaces of the upper tool holder respectively.

[0010] Preferably, the profile rectangle of the front surface of the rectangular plate is congruent with the profile rectangle of the rake face of the rectangular blade, and the profile rectangle of the front surface of the rectangular plate can be moved to a position completely aligned with the profile rectangle of the rake face of the rectangular blade on the lower tool holder by the up-down movement of the upper tool holder.

[0011] In the present application, the movable blade is an L-shaped movable blade, the L-shaped movable blade comprises a pair of parallelogram blades which are vertically butted, and the pair of parallelogram blades are arranged on two adjacent and perpendicular upper tool holder side surfaces of the lower part of the upper tool holder respectively; and the movable blade detection reference plate comprises a pair of parallelogram plates which are vertically butted, and the pair of parallelogram plates are arranged on two adjacent and perpendicular inner side surfaces of the single-arm gantry respectively.

[0012] In the present application, the lower cutting edges of the pair of parallelogram blades are arranged in sequence and inclined upward.

[0013] Preferably, the profile rectangle of the front surface of the parallelogram plate is congruent with the profile rectangle of the rake face of the parallelogram blade, and the profile rectangle of the front surface of the parallelogram plate can be moved to a position completely aligned with the profile rectangle of the rake face of the parallelogram blade on the lower tool holder by the up-down movement of the upper tool holder.

[0014] In order to improve the precision and sensitivity of the shear blade rake face wear detection, a further improvement scheme is that a plurality of peripheral air holes are arranged on the rectangular plate and are spaced apart from the center air hole; a first gas collecting box is arranged on the back of the rectangular plate and is connected with the center air hole and the peripheral air holes; and the first constant pressure gas supply pipeline is connected to the first gas collecting box.

[0015] Similarly, a plurality of peripheral air holes are arranged on the parallelogram plate and are spaced apart from the center air hole; a second gas collecting box is arranged on the back of the parallelogram plate and is connected with the center air hole and the peripheral air holes; and the second constant pressure gas supply pipeline is connected to the second gas collecting box.

[0016] In the present application, vertical guide rails are arranged at the four corners of the upper half of the single-arm gantry, and the upper tool holder is arranged to move up and down between the four vertical guide rails; and the moving blade detection reference plate is transversely fixed between the two adjacent vertical guide rails of the single-arm gantry.

[0017] In order to make the two ends of the parallelogram plate extend to the same length as the corresponding parallelogram blade, mounting positioning grooves are formed on the vertical guide rails in the transverse direction and are used to fix the two ends of the parallelogram plate.

[0018] In the present application, the detection method of the shear blade rake face wear online detection device is as follows:

[0019] (1) Preparation before detection: before detection, the control system connects the first constant pressure gas supply pipeline and the second constant pressure gas supply pipeline in advance to provide constant pressure gas flow for the first gas collecting box and the second gas collecting box;

[0020] (2) Detection of the rake face wear of the fixed blade and replacement: in the idle state, the control system controls the upper tool holder to move downward, so that the front surface of the pair of rectangular plates on the upper tool holder corresponds to the rake face of the pair of rectangular blades on the lower tool holder, respectively, and the outer contour of the front surface of the rectangular plate is completely aligned with the outer contour of the rake face of the rectangular blade; the constant pressure gas flow in the first gas collecting box leaks from the gap between the front surface of the rectangular plate and the rake face of the rectangular blade after passing through the center air hole and the peripheral air holes on the rectangular plate; the control system obtains the leakage amount of the gas flow according to the first gas flow sensor arranged on the first constant pressure gas supply pipeline; when the wear amount of the rake face of the rectangular blade is large, the gap between the front surface of the rectangular plate and the rake face of the rectangular blade is increased, and the leakage amount of the gas flow between the front surface of the rectangular plate and the rake face of the rectangular blade exceeds the pre-set threshold value, the control system issues an alarm to remind the equipment maintenance personnel to replace the rectangular blade;

[0021] (3) the rake face wear detection and replacement of the moving blade: in the idle state, the control system controls the upper tool holder to move upward, so that the front surfaces of a pair of parallelogram plates on the single-arm gantry correspond to the rake faces of a pair of parallelogram blades on the upper tool holder respectively, and the outer contours of the front surfaces of the parallelogram plates are completely aligned with the outer contours of the rake faces of the parallelogram blades; the constant-pressure gas flow in the second gas collecting box leaks out from the gap between the front surfaces of the parallelogram plates and the rake faces of the parallelogram blades after passing through the center gas holes and the peripheral gas holes on the parallelogram plates; the control system obtains the leakage amount of the gas flow according to the second gas flow sensor arranged on the second constant-pressure gas supply pipeline; when the wear amount of the rake faces of the parallelogram blades is large, the gap between the front surfaces of the parallelogram plates and the rake faces of the parallelogram blades is increased, and then the leakage amount of the gas flow between the front surfaces of the parallelogram plates and the rake faces of the parallelogram blades exceeds the preset threshold value, the control system issues an alarm to remind the equipment maintenance personnel to replace the parallelogram blades.

[0022] Preferably, the control system detects the wear of the rake faces of the shearing blades once every time the block shearing machine is started.

[0023] Preferably, the control system automatically sets the time interval for the online detection of the wear of the rake faces of the shearing blades; when the continuous shearing time of the block shearing machine reaches the set time interval, the shearing is temporarily stopped, and then the wear of the rake faces of the shearing blades is detected once; when the detection is qualified (the wear amount of the rake faces of the shearing blades does not exceed the set value), the shearing is continued; when the detection is unqualified (the wear amount of the rake faces of the shearing blades exceeds the set value), an alarm is issued to remind the equipment maintenance personnel to replace the shearing blades.

[0024] The present application has the following advantages:

[0025] Firstly, the online detection device for the wear of the rake faces of the shearing blades of the block shearing machine can realize the online automatic comprehensive detection and evaluation of the wear amount of the rake faces of the shearing blades by using the gas leakage principle, so as to accurately reflect the actual situation of the wear of the rake faces of the shearing blades, overcome the possible drawbacks of the experience judgment method used by the operators, improve the working reliability of the block shearing machine, and then improve the service life of the block shearing machine and reduce the maintenance workload of the equipment.

[0026] Second, the shearing blade rake face wear online detection device of the block shearing machine optimizes the position setting of the fixed blade detection reference plate (rectangular plate) and the movable blade detection reference plate (parallelogram plate), and the fixed blade detection reference plate (rectangular plate) and the movable blade detection reference plate (parallelogram plate) completely avoid friction with the sheared material in the continuous shearing process of the shearing machine, so that the fixed blade detection reference plate (rectangular plate) and the movable blade detection reference plate (parallelogram plate) are not worn for a long time.

[0027] Third, the shearing blade rake face wear online detection device of the block shearing machine can realize a more flexible online detection mode, and can perform self-checking of the shearing blade rake face wear each time the machine is started or during the continuous shearing process, so that the normal operation of the block shearing machine equipment is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic view of the shearing blade rake face wear online detection device of the block shearing machine of the present application;

[0029] Figure 2 is Figure 1 a partial enlarged view of

[0030] Figure 3 is Figure 1 a top view of the shearing platform part in

[0031] Figure 4 is Figure 1 a schematic view of the movable blade and the fixed blade in

[0032] Figure 5 is a structural schematic view of the fixed blade wear detection device arranged on the upper knife seat in Figure 1

[0033] Figure 6 is a structural schematic view of the fixed blade detection reference plate (rectangular plate) in Figure 5 further increased after the peripheral air holes are further increased on the basis of the structure of the movable blade detection reference plate (parallelogram plate) in

[0034] Figure 7 is a structural schematic view of the movable blade detection reference plate (parallelogram plate) in

[0035] Figure 8 further increased after the peripheral air holes are further increased on the basis of the structure of the movable blade detection reference plate (parallelogram plate) in Figure 2

[0036] ​​In the figure: 1, shearing platform, 2, single-arm gantry, 3, lower knife seat, 4, fixed blade (L-shaped fixed blade), 5, upper knife seat, 6, moving blade (L-shaped moving blade), 7, rake face of moving blade, 8, rake face of fixed blade, 9, fixed blade wear detection device, 10, fixed blade detection reference plate (rectangular plate), 11, center vent hole, 12, first constant pressure gas supply pipeline, 13, first gas flow sensor, 14, base (rectangular plate), 15, shearing plane, 16, moving blade wear detection device, 17, moving blade detection reference plate (parallelogram plate), 18, second constant pressure gas supply pipeline, 19, second gas flow sensor, 20, rectangular blade, 21, parallelogram blade, 22, peripheral vent hole, 23, first gas collection box, 24, second gas collection box, 25, vertical guide rail, 26, mounting and positioning groove. DETAILED DESCRIPTION

[0037] The specific embodiments of the present application are further described below in conjunction with the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.

[0038] As Figures 1 to 8The embodiment of the application is shown as a shearing blade rake face wear online detection device of a block shearing machine, the block shearing machine comprising a shearing platform 1, a single-arm gantry 2 arranged above the shearing platform 1 and connected with the shearing platform 1, a lower knife seat 3 arranged on the shearing platform 1, a fixed blade 4 arranged on the upper side of the lower knife seat 3, an upper knife seat 5 arranged on the single-arm gantry 2 and movable up and down, and a moving blade 6 arranged on the lower side of the upper knife seat 5; when the upper knife seat 5 moves downward, the moving blade 6 of the upper knife seat 5 and the fixed blade 4 on the lower knife seat 3 form a mutual shearing movement in the vertical direction, and the moving blade 6 and the fixed blade 4 are in a mutual shearing state, in which the rake face of the moving blade 5 and the rake face of the fixed blade 4 face each other; the shearing blade rake face wear online detection device comprises a fixed blade wear detection device 9 for detecting the wear of the rake face of the fixed blade 4, the fixed blade wear detection device 9 comprising a fixed blade detection reference plate 10 arranged on the side of the upper knife seat 5 on which the moving blade 6 is arranged, a central air hole 11 opened in the center of the front surface of the fixed blade detection reference plate 10, a first constant-pressure air supply pipeline 12 connected with the central air hole 11 from the back side of the fixed blade detection reference plate 10, and a first gas flow sensor 13 arranged on the first constant-pressure air supply pipeline 12; the fixed blade detection reference plate 10 is located above the moving blade 6 on the side of the upper knife seat 5, the front surface of the fixed blade detection reference plate 10 is located on the shearing plane 15 formed by the mutual shearing of the moving blade 6 and the fixed blade 4, and the first gas flow sensor 13 is connected with the control system of the block shearing machine; wherein the front surface of the fixed blade detection reference plate 10 is away from the side of the upper knife seat 5.

[0039] In the embodiment, the shearing blade rake face wear online detection device further comprises a moving blade wear detection device 16 for detecting the wear of the rake face of the moving blade 6, the moving blade wear detection device comprising a moving blade detection reference plate 17 arranged on the inner side of the upper part of the single-arm gantry 2, a central air hole 11 opened in the center of the front surface of the moving blade detection reference plate 17, a second constant-pressure air supply pipeline 18 connected with the central air hole 11 from the back side of the moving blade detection reference plate 17, and a second gas flow sensor 19 arranged on the second constant-pressure air supply pipeline 18 and connected with the control system; the front surface of the moving blade detection reference plate 17 is located on the shearing plane 15 formed by the mutual shearing of the moving blade 6 and the fixed blade 4; wherein the front surface of the moving blade detection reference plate 17 is toward the side of the upper knife seat 5 on which the moving blade 6 is arranged.

[0040] In the embodiment, the fixed blade 4 is an L-shaped fixed blade, which comprises a pair of rectangular blades 20 butted perpendicularly to each other, and the pair of rectangular blades 20 are arranged on two adjacent and perpendicular side surfaces of the lower tool seat 3 respectively; the fixed blade detection reference flat plate 10 comprises a pair of rectangular flat plates 10 butted perpendicularly to each other, and the pair of rectangular flat plates 10 are arranged on two adjacent and perpendicular side surfaces of the upper tool seat 5 respectively.

[0041] Preferably, the profile rectangle of the front surface of the rectangular flat plate 10 is congruent to the profile rectangle of the rake surface of the rectangular blade 20, and the profile rectangle of the front surface of the rectangular flat plate 10 can be moved to a position completely aligned with the profile rectangle of the rake surface of the rectangular blade 20 on the lower tool seat 3 by the up-and-down movement of the upper tool seat 5.

[0042] In the embodiment, the moving blade 6 is an L-shaped moving blade 6, which comprises a pair of parallelogram blades 21 butted perpendicularly to each other, and the pair of parallelogram blades 21 are arranged on two adjacent and perpendicular side surfaces of the lower part of the upper tool seat 5 respectively; the moving blade detection reference flat plate comprises a pair of parallelogram flat plates butted perpendicularly to each other, and the pair of parallelogram flat plates are arranged on two adjacent and perpendicular inner side surfaces of the single-arm gantry respectively.

[0043] In the embodiment, the lower cutting edges of the pair of parallelogram blades 21 are arranged in sequence and inclined upward.

[0044] Preferably, the profile rectangle of the front surface of the parallelogram flat plate 17 is congruent to the profile rectangle of the rake surface of the parallelogram blade 21, and the profile rectangle of the front surface of the parallelogram flat plate 17 can be moved to a position completely aligned with the profile rectangle of the rake surface of the parallelogram blade 21 on the lower tool seat 3 by the up-and-down movement of the upper tool seat 5.

[0045] In order to improve the precision and sensitivity of the shear blade rake face wear detection, a further improvement scheme is that a plurality of peripheral air holes 22 are arranged on the rectangular flat plate 10 and distributed around the central air hole of the rectangular flat plate 10, a first gas collecting box 23 is arranged on the back surface of the rectangular flat plate 10 and connected with the central air hole 11 and the peripheral air holes 11 on the rectangular flat plate 10 respectively, and the first constant pressure gas supply pipeline 12 is connected to the first gas collecting box 23.

[0046] Similarly, a plurality of peripheral air holes 22 are arranged on the parallelogram plate 17 at intervals around the central air hole 11 of the parallelogram plate 17, and a second gas collecting box 24 is arranged on the back of the parallelogram plate 17 and communicates with the central air hole 11 and the peripheral air holes 22 of the parallelogram plate 17, respectively. The second constant-pressure gas supply pipeline 18 is connected to the second gas collecting box 24.

[0047] In this embodiment, vertical guide rails 25 are arranged at the four corners of the upper half of the single-arm gantry 2, and the upper tool holder 3 is arranged to move up and down between the four vertical guide rails 25, and the moving blade detection reference plate 17 is transversely fixed between the two adjacent vertical guide rails 25 of the single-arm gantry 2.

[0048] In order to make the two ends of the parallelogram plate 17 extend to the same length as the corresponding parallelogram blade 21, mounting positioning grooves 26 are arranged on the vertical guide rails 25 for fixing the two ends of the parallelogram plate 27.

[0049] In this embodiment, the detection method of the shear blade rake face wear on-line detection device is as follows:

[0050] (1) Preparation before detection: Before detection, the control system connects the first constant-pressure gas supply pipeline 12 and the second constant-pressure gas supply pipeline 18 in advance to provide constant-pressure gas flow for the first gas collecting box 23 and the second gas collecting box 24.

[0051] (2) Detection and replacement of the rake face wear of the fixed blade: In the no-load state, the control system controls the upper tool holder 5 to move downward, so that the front surface of the pair of rectangular plates 10 on the upper tool holder 5 corresponds to the rake face of the pair of rectangular blades 20 on the lower tool holder 3, respectively, and the outer contour of the front surface of the rectangular plate 10 is completely aligned with the outer contour of the rake face of the rectangular blade 20; the constant-pressure gas flow in the first gas collecting box 23 leaks out from the gap between the front surface of the rectangular plate 10 and the rake face of the rectangular blade 20 after passing through the central air hole 11 and the peripheral air holes 22 on the rectangular plate 10; the control system obtains the leakage amount of the gas flow according to the first gas flow sensor 13 arranged on the first constant-pressure gas supply pipeline 12, when the wear amount of the rake face of the rectangular blade 20 is large, the gap between the front surface of the rectangular plate 20 and the rake face of the rectangular blade 20 increases, and then the gas flow leakage amount between the front surface of the rectangular plate 10 and the rake face of the rectangular blade 20 exceeds the pre-set threshold value, the control system issues an alarm to remind the equipment maintenance personnel to replace the rectangular blade 20;

[0052] (3) the rake face wear detection and replacement of the moving blade: in the idle state, the control system controls the upward movement of the upper tool holder 5, so that the front surface of the pair of parallelogram plates 17 on the single-arm gantry 2 corresponds to the rake face of the pair of parallelogram blades 21 on the upper tool holder 5, respectively, and the outer contour of the front surface of the parallelogram plate 17 is completely aligned with the outer contour of the rake face of the parallelogram blade 21; the constant pressure gas flow in the second gas collecting box 24 leaks out from the gap between the front surface of the parallelogram plate 17 and the rake face of the parallelogram blade 21 after passing through the center air hole 11 and the peripheral air hole 22 on the parallelogram plate 17; the control system obtains the leakage amount of the gas flow according to the second gas flow sensor 19 arranged on the second constant pressure gas supply pipeline 18, when the wear amount of the rake face of the parallelogram blade 21 is large, the gap between the front surface of the parallelogram plate 17 and the rake face of the parallelogram blade 21 increases, and then the gas flow leakage amount between the front surface of the parallelogram plate 17 and the rake face of the parallelogram blade 21 exceeds the pre-set threshold value, the control system issues an alarm to remind the equipment maintenance personnel to replace the parallelogram blade 21.

[0053] Preferably, the control system detects the wear of the rake face of the shearing blade once every time the block shearing machine is started.

[0054] Preferably, the control system automatically sets the time interval for online detection of the wear of the rake face of the shearing blade, and when the continuous shearing time of the block shearing machine reaches the set time interval, the shearing is temporarily stopped, and then the wear of the rake face of the shearing blade is detected once, and when the detection is qualified (the wear amount of the rake face of the shearing blade does not exceed the set value), the shearing is continued, and when the detection is unqualified (the wear amount of the rake face of the shearing blade exceeds the set value), an alarm is issued to remind the equipment maintenance personnel to replace the shearing blade.

[0055] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the technical principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. An online detection device for the wear of the rake face of the shearing blade of a block shearing machine, characterized in that: The block shearing machine includes a shearing platform, a single-arm gantry frame arranged above the shearing platform and connected to the shearing platform, a lower knife seat arranged on the shearing platform, a fixed blade arranged on the upper side of the lower knife seat, an upper knife seat arranged on the single-arm gantry frame and movable up and down, and a movable blade arranged on the lower side of the upper knife seat; when the upper knife seat moves downward, a mutual shearing movement is formed between the movable blade of the upper knife seat and the fixed blade on the lower knife seat in the vertical direction, and the rake surface of the movable blade and the rake surface of the fixed blade face each other in the state of mutual shearing; the shear blade rake surface wear online detection device includes a fixed blade wear detection device for detecting the wear of the fixed blade rake surface, The fixed blade wear detection device includes a fixed blade detection reference plate arranged at a side position of an upper blade seat on which the movable blade is installed, a central air vent provided at a central position on the front side of the fixed blade detection reference plate, a first constant-pressure air supply pipeline connected to the central air vent from a back side of the fixed blade detection reference plate, and a first gas flow sensor arranged on the first constant-pressure air supply pipeline, the fixed blade detection reference plate is located above the movable blade on the side of the upper blade seat, the front side of the fixed blade detection reference plate is located on a shearing plane formed by the movable blade and the fixed blade shearing each other, and the first gas flow sensor is connected to a control system of a block shearing machine; wherein the front side of the fixed blade detection reference plate is a side away from the side of the upper blade seat; The movable blade is an L-shaped movable blade, and the L-shaped movable blade includes a pair of parallelogram blades that are perpendicular to each other, and the lower cutting edges of the pair of parallelogram blades are arranged in an upward tilt in sequence; the fixed blade is an L-shaped fixed blade, and the L-shaped fixed blade includes a pair of rectangular blades that are perpendicular to each other, and the pair of rectangular blades are respectively arranged on two adjacent and mutually perpendicular lower blade seat sides of the lower blade seat; the fixed blade detection reference plate includes a pair of rectangular plates that are perpendicular to each other, and the pair of rectangular plates are respectively arranged on two adjacent and mutually perpendicular upper blade seat sides of the upper blade seat; The outline rectangle of the front face of the rectangular plate is congruent to the outline rectangle of the front cutting edge of the rectangular blade, and the outline rectangle of the front face of the rectangular plate can be moved to a position completely aligned with the outline rectangle of the front cutting edge of the rectangular blade on the lower plate by moving the upper plate up and down; the rectangular plate is also provided with a number of peripheral air vents spaced apart around the central air vent of the rectangular plate, and the back of the rectangular plate is provided with a first air collecting box respectively connected to the central air vent and the peripheral air vent on the rectangular plate, and the first constant pressure air supply pipeline is connected to the first air collecting box.

2. The on-line detection device for the wear of the rake face of the shearing blade of a block shearing machine according to claim 1 is characterized in that: The online detection device for the wear on the front cutting edge of the shearing blade also includes a dynamic blade wear detection device for detecting the wear on the front cutting edge of the dynamic blade, and the dynamic blade wear detection device includes a dynamic blade detection reference plate arranged at the inner side of the upper part of the single-arm gantry, a central air vent opened at the center position of the front of the dynamic blade detection reference plate, a second constant-pressure air supply pipeline connected to the central air vent from the back side of the dynamic blade detection reference plate, and a second gas flow sensor arranged on the second constant-pressure air supply pipeline and connected to the control system. The front of the dynamic blade detection reference plate is located on the shear plane formed by the mutual shearing of the dynamic blade and the fixed blade; wherein the front of the dynamic blade detection reference plate is the side facing the side of the upper blade seat on which the dynamic blade is installed.

3. The on-line detection device for the wear of the rake face of the shearing blade of a block shearing machine according to claim 2, characterized in that: The pair of parallelogram blades are respectively arranged on two adjacent and mutually perpendicular upper blade seat side surfaces at the lower part of the upper blade seat; the movable blade detection reference plate includes a pair of parallelogram plates that are perpendicularly connected to each other, and the pair of parallelogram plates are respectively arranged on two adjacent and mutually perpendicular inner side surfaces of the single-arm gantry on the inner side of the single-arm gantry.

4. The on-line detection device for the wear of the rake face of the shearing blade of a block shearing machine according to claim 3 is characterized in that: The outline rectangle of the front face of the parallelogram plate is congruent with the outline rectangle of the rake face of the parallelogram blade, and the outline rectangle of the front face of the parallelogram plate can be moved to a position completely aligned with the outline rectangle of the rake face of the parallelogram blade on the lower blade seat by moving the upper blade seat up and down.

5. The on-line detection device for the wear of the rake face of the shearing blade of a block shearing machine according to claim 4, characterized in that: The parallelogram plate is also provided with a number of peripheral air vents spaced apart around the central air vent of the parallelogram plate. The back of the parallelogram plate is provided with a second air collecting box respectively connected to the central air vent and the peripheral air vent on the parallelogram plate. The second constant pressure air supply pipeline is connected to the second air collecting box.

6. The on-line detection device for the wear of the rake face of the shearing blade of a block shearing machine according to claim 5, characterized in that: The four inner corners of the upper half of the single-arm gantry are respectively fixed with vertical guide rails, the upper knife seat is arranged to move up and down between the four vertical guide rails, and the movable blade detection reference plate is horizontally fixed between two adjacent vertical guide rails of the single-arm gantry.

7. An online detection device for rake face wear of a shearing blade of a block shearing machine according to any one of claims 1 to 6, characterized in that: The detection method of the shear blade rake face wear online detection device is as follows: (1) Preparation before testing: Before testing, the control system connects the first constant pressure gas supply pipeline and the second constant pressure gas supply pipeline in advance to provide constant pressure airflow for the first gas collecting box and the second gas collecting box; (2) Detection and replacement of the front cutting edge wear of the fixed blade: In the no-load state, the control system controls the upper blade seat to move downward so that the front faces of a pair of rectangular plates on the upper blade seat are respectively opposite to the front cutting edges of a pair of rectangular blades on the lower blade seat, and the outer contours of the front faces of the rectangular plates are completely aligned with the outer contours of the front cutting edges of the rectangular blades; the constant-pressure airflow in the first air collecting box passes through the central air vent and the peripheral air vent on the rectangular plate, and leaks out from the gap between the front face of the rectangular plate and the front cutting edge of the rectangular blade; the control system obtains the leakage amount of the airflow based on the first gas flow sensor provided on the first constant-pressure air supply pipeline. When the wear amount of the front cutting edge of the rectangular blade is large, resulting in an increase in the gap between the front face of the rectangular plate and the front cutting edge of the rectangular blade, and then the leakage amount of the airflow between the front face of the rectangular plate and the front cutting edge of the rectangular blade exceeds a preset threshold, the control system issues an alarm to remind the equipment maintenance personnel to replace the rectangular blade; (3) Detection and replacement of the front cutting edge wear of the moving blade: In the no-load state, the control system controls the upper blade holder to move upward so that the front faces of a pair of parallelogram plates on the single-arm gantry are respectively opposite to the front cutting edges of a pair of parallelogram blades on the upper blade holder, and the outer contour of the front face of the parallelogram plate is completely aligned with the outer contour of the front cutting edge of the parallelogram blade; the constant pressure airflow in the second air collecting box passes through the central air vent and the peripheral air vent on the parallelogram plate, and leaks out from the gap between the front face of the parallelogram plate and the front cutting edge of the parallelogram blade; the control system obtains the leakage amount of the airflow based on the second gas flow sensor set on the second constant pressure air supply pipeline. When the wear amount of the front cutting edge of the parallelogram blade is large, resulting in an increase in the gap between the front face of the parallelogram plate and the front cutting edge of the parallelogram blade, and then the leakage amount of the airflow between the front face of the parallelogram plate and the front cutting edge of the parallelogram blade exceeds the preset threshold, the control system issues an alarm to remind the equipment maintenance personnel to replace the parallelogram blade.

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