Scatter point drawing device with random distribution

Abstract

The invention discloses a scatter point drawing device with random distribution. The scatter point drawing device comprises a roller support, a magnetic piece, a roller, a printing point block, a screw, a transmission assembly, a limiting assembly, an ink conveying assembly and a magnetic trigger circuit. Wherein a magnetic piece and a roller are oppositely arranged on the roller support, the roller is provided with a cavity, the ink conveying assembly and the transmission assembly are both arranged in the cavity, the limiting assemblies are arranged at the two ends of the cavity and are separated from the ink conveying assembly, and the limiting assemblies are used for controlling the distance between the roller and a test block to be drawn; a plurality of groups of printing point blocks are uniformly distributed on the surface of the roller, and the printing point blocks are different in size and / or section shape; and each printing point block corresponds to one screw rod, and each group of printing point blocks corresponds to one transmission assembly. According to the device, the magnetic sensing circuit is triggered in the rolling process, the transmission assembly closest to the test block is driven to operate, the angle of the printing point block is changed, and the drawn scatter angle has randomness.

Description

Technical Field

[0001] The present invention relates to a drawing device, and more particularly to a scatter point drawing device with a random distribution. Background Art

[0002] Drawing scatter points on the surface of a test block before a shear test can help determine the initial state of the test piece. These scatter points can intuitively present the original texture, particle distribution, etc. of the material surface, serving as a reference basis for observing the changes in the material during the subsequent test process, such as observing from which positions cracks or local deformations start to appear in the material; and it is beneficial for accurately measuring the shear displacement. If relative displacement occurs in the material during the test, by comparing the position changes of the scatter points, the magnitude and direction of the shear displacement can be accurately measured, thereby obtaining more accurate test data for analyzing the shear performance of the material.

[0003] Before the existing shear test, the method of drawing scatter points on the surface of the test block is often to draw them manually with a marker pen. For the surface of a relatively large test block, the labor and time consumed for drawing scatter points are excessive, which slows down the test process and reduces the test efficiency. Therefore, it is necessary to improve the efficiency of the method for drawing scatter points and shorten the scatter point drawing time and reduce the labor occupation.

[0004] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0005] The object of the present invention is to provide a scatter point drawing device with a random distribution, which solves the problem that scatter points need to be drawn manually with a marker pen on the surface of a test block during a shear test, can improve the drawing efficiency, and ensures that the angles, sizes, and shapes of the drawn scatter points are random.

[0006] To achieve the above object, the present invention provides a scatter plot drawing device with a random distribution, which device comprises: a roller bracket, a magnetic sheet, a roller, printing dot blocks, a screw, a transmission assembly, a limit assembly, an ink delivery assembly, and a magnetic trigger circuit; wherein, the magnetic sheet is disposed opposite to the side wall of the roller and spaced apart by a distance on the roller bracket, the magnetic sheet is fixed on the roller bracket, and the roller is rotatably disposed on the roller bracket; the roller has a cavity, both the ink delivery assembly and the transmission assembly are disposed in this cavity, the limit assembly is disposed at both ends of this cavity and separated from the ink delivery assembly, and the limit assembly is used to control the distance between the roller and the test block to be drawn; several groups of the printing dot blocks are evenly distributed on the surface of the roller, and the size and / or cross-sectional shape of each printing dot block are different; each printing dot block corresponds to a screw, each group of printing dot blocks corresponds to a transmission assembly, one end of the screw passes through the surface of the roller and is fixedly connected to the bottom of the printing dot block, and the side wall of the other end thereof is fixedly connected to the transmission assembly. The motor one of the transmission assembly is used to drive the transmission assembly and transmit to the printing dot block to drive the corresponding group of printing dot blocks to rotate on the surface of the roller to change the angle of the printing dot block, so that the drawn scatter points have randomness; the inside of the screw is a hollow structure, and the end thereof connected to the motor one is connected to the ink delivery assembly, and is used to transport the ink in the ink delivery assembly to the printing dot block; the magnetic trigger circuit comprises: the magnetic sensitive element, a diode, a motor one, and a power supply. Several successively connected magnetic sensitive elements, diodes, and motor one are connected in parallel and electrically connected to the power supply; the magnetic force of the magnetic sheet is the minimum magnetic force requirement magnitude for the magnetic sensitive element corresponding to the printing dot block closest to it to respond. When the magnetic sensitive element responds, the voltage in the magnetic trigger circuit reaches the trigger voltage of the diode in the circuit, causing the motor one in the magnetic trigger circuit to start working.

[0007] Preferably, the limit assembly comprises: a connecting block, a sliding strip, a turntable, and a motor two; wherein, the connecting block is fixed at both ends of the roller, and it has a disc-shaped structure. A plurality of sliding grooves are evenly distributed on the circumference of this disc-shaped structure; a plurality of teeth are provided on the circumference of the turntable, and a plurality of arc-shaped slideways corresponding to the sliding grooves are evenly distributed on the surface; the motor two is used to drive the turntable to rotate; the sliding strip comprises: a sliding edge, an arc-shaped edge, and a sliding bar. One end of the sliding edge is fixedly connected to the middle of the arc-shaped edge, and the other end is fixedly connected to the sliding bar. The sliding edge is slidably disposed in the sliding groove, and the sliding bar passes through the sliding groove and is limited in the arc-shaped slideway on the surface of the turntable.

[0008] Preferably, an installation hole is provided at the center of the surface of the turntable, and the output shaft of the motor two is fixed in the installation hole; or, a connecting wheel is sleeved on the output shaft of the motor two, and the connecting wheel is meshed and connected with the turntable.

[0009] Preferably, a limiting member is rotatably provided at a position on the mounting rod of the drum bracket where the two ends of the drum are respectively connected. The output shaft of the second motor is fixed in the mounting hole, and the second motor is installed in the cavity of the limiting member; or, the drum bracket is rotatably connected to the turntable, and a mounting seat is provided on the drum bracket for installing the second motor.

[0010] Preferably, the limiting assembly further includes: a limiting ring; the limiting ring includes: a plurality of fixing parts and telescopic parts. Both the fixing parts and the telescopic parts have an arc structure. A telescopic part is connected between two adjacent fixing parts, and the telescopic part is inserted into the fixing part and can move relatively. The fixing parts and the telescopic parts are connected together to form a circular ring; wherein, the fixing part is fixedly connected to the arc-shaped edge of the sliding strip.

[0011] Preferably, the second motor is set to start and stop at a fixed time; or, the second motor is connected in series with the first motor, and when the first motor is turned on, the second motor is also turned on.

[0012] Preferably, the transmission assembly includes: a first gear, a track, a second gear and a first motor; wherein, the first gear is sleeved on the side wall of the screw rod, the second gear and a plurality of first gears are all engaged with the track, and the second gear is sleeved on the output shaft of the first motor.

[0013] Preferably, the diameters of the plurality of first gears are different; or / and, in the initial state, the angles of the plurality of printing dot blocks are different.

[0014] Preferably, the transmission assembly further includes: a tension wheel and a mounting shaft; wherein, a tension wheel is arranged between a plurality of adjacent first gears or / and between the second gear and its adjacent first gear. The tension wheel is in contact with the surface of the track. The tension wheel is sleeved on the mounting shaft, and the mounting shaft is fixed in the cavity of the drum.

[0015] Preferably, the printing dot block is a trapezoid-like structure, and its cross-sectional area decreases in the vertical outward direction, and the material of the printing dot block is an elastic porous material; more preferably, the elastic porous material is selected from hard sponge; or / and, at least one of the printing dot blocks in each group is provided with the magnetic sensitive element or at least one magnetic sensitive element is provided at the position of each group of printing dot blocks on the side wall of the drum; or / and, a main switch is provided in the magnetic trigger circuit or a protective sleeve is provided on the magnetic sheet so that the magnetic sensitive element does not respond when not in use; or / and, the ink delivery assembly includes: an ink strip and an ink absorbing sponge; the ink strip is installed in the hollow structure of the screw rod, and the ink absorbing sponge is arranged in the cavity of the drum; one end of the ink strip is inserted into the bottom of the printing dot block through the hollow structure of the screw rod, and the other end is inserted into the ink absorbing sponge; or / and, an ink injection hole is provided on the drum for adding ink to the ink absorbing sponge.

[0016] The scatter plot drawing device with random distribution of the present invention solves the problem that in the shear test, manual drawing with a marker pen is required to draw scatter points on the surface of the test block, and can improve the drawing efficiency, and has the following advantages: (1) By designing structures such as an ink dot block, a screw, a transmission component, a limiting component, and a magnetic-sensitive circuit, the present invention triggers the magnetic-sensitive circuit during the rolling process, drives the operation of the transmission component closest to the test block, thereby changing the angle of the ink dot block, making the angles of the drawn scatter points random, and the sizes and / or cross-sectional shapes of the ink dot blocks are all different, and the shapes of the drawn scatter points are also random; (2) The present invention designs the ink dot block as a trapezoid-like structure, the cross-sectional area of which decreases in the vertically outward direction, and the material of the ink dot block is an elastic porous material. By controlling the degree of extrusion of the ink dot block by the limiting component, the sizes of the drawn scatter points are random; (3) The structure of the limiting component designed by the present invention realizes the change of the size of the limiting component and adjusts the distance between the roller and the test block to be drawn during the rotation of the turntable through the structural design of the arc-shaped slide and the slide bar on the turntable; (4) Through the design of the screw structure, the present invention can drive the rotation of the ink dot block while realizing the transportation of the ink. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the scatter plot drawing device with random distribution of the present invention.

[0018] Figure 2 It is a schematic structure of a limiting component of the present invention Figure 1 .

[0019] Figure 3 It is a schematic structure of a limiting component of the present invention Figure 2 .

[0020] Figure 4 It is another schematic structure of a limiting component of the present invention Figure 1 .

[0021] Figure 5 It is another schematic structure of a limiting component of the present invention Figure 2 .

[0022] Figure 6 It is a schematic structural diagram of the transmission component of the present invention.

[0023] Figure 7 It is a schematic structural diagram of the roller bracket of the present invention.

[0024] Figure 8 It is a circuit diagram of the magnetic trigger circuit of the present invention. Detailed implementation manners

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] It should be noted that the features mentioned in the present invention can be arbitrarily combined as long as there is no contradiction in the combination of these features, and all possible combinations should be considered as the scope described in this specification. Each feature disclosed in the specification can be replaced by any alternative feature that can provide the same, equivalent or similar purpose. Therefore, unless otherwise specifically stated, the disclosed features are only general examples of equivalent or similar features.

[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention; the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] Refer to Figure 1, A scatter plot drawing device with a random distribution, the device comprising: a drum bracket 10, a magnetic sheet 20, a drum 30, printing dot blocks 40, a screw 50, a transmission assembly 60, a limit assembly 70, an ink delivery assembly, and a magnetic trigger circuit. Among them, the magnetic sheet 20 is opposite to the side wall of the drum 30 and is arranged on the drum bracket 10 at a distance, the magnetic sheet 20 is fixed on the drum bracket 10, and the drum 30 is rotatably arranged on the drum bracket 10. The drum 30 has a cavity, the ink delivery assembly and the transmission assembly 60 are both arranged in this cavity, the limit assembly 70 is arranged at both ends of this cavity and is separated from the ink delivery assembly, and the limit assembly 70 is used to control the distance between the drum 30 and the test block to be drawn. A number of groups of printing dot blocks 40 are evenly distributed on the surface of the drum 30, and the size and / or cross-sectional shape of each printing dot block 40 are different. Each printing dot block 40 corresponds to a screw 50, each group of printing dot blocks 40 corresponds to a transmission assembly 60, one end of the screw 50 passes through the surface of the drum 30 and is fixedly connected to the bottom of the printing dot block 40, and the side wall of the other end thereof is fixedly connected to the transmission assembly 60. The motor one 64 of the transmission assembly 60 is used to drive the transmission assembly 60 and transmit to the printing dot block 40 to drive the corresponding group of printing dot blocks 40 to rotate on the surface of the drum 30 to change the angle of the printing dot block 40, so that the drawn scatter points have randomness. The inside of the screw 50 is a hollow structure, and the end thereof connected to the motor one 64 is connected to the ink delivery assembly, and is used to transport the ink in the ink delivery assembly to the printing dot block 40. See Figure 8 , The magnetic trigger circuit comprises: a magnetic sensitive element 91, a diode 92, a motor one 64, and a power supply 93. A number of sequentially connected magnetic sensitive elements 91, diodes 92, and motor one 64 are connected in parallel and electrically connected to the power supply 93; the magnetic force of the magnetic sheet 20 is the minimum magnetic force requirement for the magnetic sensitive element 91 corresponding to the printing dot block 40 closest to it to respond. When the magnetic sensitive element 91 responds, the voltage in the magnetic trigger circuit reaches the trigger voltage of the diode 92 in the circuit, so that the motor one 64 in the magnetic trigger circuit starts to work.

[0029] Exemplarily, the magnetic sheet 20 can be strip-shaped, and the material of the magnetic sheet 20 is a magnet.

[0030] Exemplarily, a handle is provided on the drum bracket 10. The handle can be arranged in the middle of the mounting rod for fixing the magnetic sheet 20 on the drum bracket 10, which is convenient for operating the drum 30 to roll during use. The drum bracket 10 can be designed as a mounting rod with a U-shaped structure at both ends. The handle is vertically fixed in the middle of the mounting rod, and the drum 30 is rotatably arranged at the upper end of the U-shaped structure.

[0031] Exemplarily, a spacer can be installed in the cavity of the drum 30 to separate the ink delivery assembly from the limit assembly 70.

[0032] Exemplarily, the magnetosensitive element 91 can be a magnetoresistor. The magnetoresistor can be a Ni-Co thin film type. The diode can be a 1N4148. The first motor can be a JGA25-370 (3V). The power supply can be two AA batteries (3V).

[0033] According to a specific embodiment of the present invention, referring to Figures 2 - 5 , the limiting component 70 includes: a connecting block 71, a sliding bar 72, a turntable 73, and a second motor 74. Among them, the connecting block 71 is fixed at both ends of the drum 30. It has a disc-shaped structure. The circumference of this disc-shaped structure is evenly provided with sliding grooves 711. The circumference of the turntable 73 is provided with teeth, and the surface is evenly provided with arc-shaped slideways 731 corresponding to the sliding grooves 711. The second motor 74 is used to drive the turntable 73 to rotate. The sliding bar 72 includes: a sliding edge, an arc-shaped edge, and a sliding bar 721. One end of the sliding edge is fixedly connected to the middle of the arc-shaped edge, and the other end is fixedly connected to the sliding bar 721. The sliding edge is slidably arranged in the sliding groove 711, and the sliding bar 721 passes through the sliding groove 711 and is limited in the arc-shaped slideway on the surface of the turntable 73.

[0034] According to a specific embodiment of the present invention, referring to Figures 2 - 3 , the center of the surface of the turntable 73 is provided with a mounting hole, and the output shaft of the second motor 74 is fixed in the mounting hole.

[0035] According to a specific embodiment of the present invention, referring to Figure 7 , limiting members 11 are rotatably arranged at positions on the mounting rods of the drum bracket 10 that are respectively connected to both ends of the drum 30. The output shaft of the second motor 74 is fixed in the mounting hole, and the second motor 74 is installed in the cavity of the limiting member 11.

[0036] According to a specific embodiment of the present invention, referring to Figures 4 - 5 , a connecting wheel 76 is sleeved on the output shaft of the second motor 74, and the connecting wheel 76 is meshed and connected with the turntable 73.

[0037] According to a specific embodiment of the present invention, the drum bracket 10 is rotatably connected to the turntable 73, and a mounting seat is arranged on the drum bracket 10 for installing the second motor 74.

[0038] According to a specific embodiment of the present invention, the limiting component 70 further includes: a limiting ring 75. The limiting ring 75 includes: a plurality of fixing parts and telescopic parts. Both the fixing parts and the telescopic parts have arc-shaped structures. A telescopic part is connected between two adjacent fixing parts, and the telescopic part is inserted into the fixing part and can move relatively. The fixing parts and the telescopic parts are connected together to form a circular ring. Among them, the fixing part is fixedly connected to the arc-shaped edge of the sliding bar 72.

[0039] According to a specific embodiment of the present invention, the second motor 74 is set to start and stop regularly.

[0040] According to a specific embodiment of the present invention, the second motor 74 is connected in series with the first motor 64, and when the first motor 64 is turned on, the second motor 74 is also turned on.

[0041] According to a specific embodiment of the present invention, referring to Figure 6 , the transmission assembly 60 includes: a first gear 61, a crawler 62, a second gear 63, and a first motor 64. Among them, the first gear 61 is sleeved on the side wall of the screw 50, the second gear 63 and several first gears 61 are all meshed with the crawler 62, and the second gear 63 is sleeved on the output shaft of the first motor 64.

[0042] According to a specific embodiment of the present invention, the diameters of several first gears 61 are different. Therefore, the angles by which the crawler 62 drives several first gears 61 to rotate are different, so that the angles by which the screw 50 drives the printing dot block 40 are different.

[0043] According to a specific embodiment of the present invention, in the initial state, the angles of several printing dot blocks 40 are different.

[0044] According to a specific embodiment of the present invention, the transmission assembly 60 further includes: a tensioning wheel and a mounting shaft. Among them, a tensioning wheel is arranged between several adjacent first gears 61 or / and between the second gear 63 and its adjacent first gear 61. The tensioning wheel is in contact with the surface of the crawler 62. The tensioning wheel is sleeved on the mounting shaft, and the mounting shaft is fixed in the cavity of the drum 30.

[0045] According to a specific embodiment of the present invention, the printing dot block 40 has a trapezoid-like structure, and its cross-sectional area decreases in the vertical outward direction. Moreover, the material of the printing dot block 40 is an elastic porous material. Since the printing dot block 40 has a trapezoid-like structure, during use, the limiting assembly controls the distance between the drum 30 and the surface of the test block, thereby changing the degree of extrusion when the printing dot block 40 contacts the surface of the test block. If the distance between the drum 30 and the surface of the test block is small, the degree of extrusion when the printing dot block 40 contacts the surface of the test block is small, and the contact area between the printing dot block 40 and the surface of the test block is small. At this time, the scattered dots drawn are small. If the distance between the drum 30 and the surface of the test block becomes larger, the degree of extrusion when the printing dot block 40 contacts the surface of the test block becomes larger, and the contact area between the printing dot block 40 and the surface of the test block becomes larger, making the scattered dots drawn larger. Therefore, the device of the present invention can ensure that there are slight changes in the size of the ink dots printed by the printing dot block on the test block.

[0046] Exemplarily, the elastic porous material is selected from rigid sponges.

[0047] According to a specific embodiment of the present invention, at least one magnetic sensitive element 91 is arranged in at least one printing dot block 40 in each group of printing dot blocks 40, or at least one magnetic sensitive element 91 is arranged at the position of each group of printing dot blocks 40 on the side wall of the drum 30.

[0048] Exemplarily, for each set of printing dot blocks, when multiple magnetic sensors 91 are provided, several magnetic sensors 91 can be connected in parallel and then connected in series with a diode 92 and a first motor 64, so that when at least one magnetic sensor 91 responds, the first motor 64 can be started. However, it is not limited to this connection method, and those skilled in the art can design according to requirements such as corresponding sensitivity.

[0049] According to a specific embodiment of the present invention, a main switch is provided in the magnetic trigger circuit or a protective sleeve is provided on the magnetic sheet 20 so that the magnetic sensor 91 does not respond when not in use.

[0050] According to a specific embodiment of the present invention, the ink delivery assembly includes: an ink strip 81 and an ink absorbing sponge 82. The ink strip 81 is installed in the hollow structure of the screw 50, and the ink absorbing sponge 82 is arranged in the cavity of the drum 30. One end of the ink strip 81 is inserted into the bottom of the printing dot block 40 through the hollow structure of the screw 50, and the other end is inserted on the ink absorbing sponge 82.

[0051] Exemplarily, the ink strip 81 is in a long strip structure, and its material is a porous fiber material. The ink strip 81 will absorb the ink in the ink absorbing sponge 82 and diffusely transfer it to the printing dot block 40 to supplement the ink consumption of the printing dot block 40.

[0052] Exemplarily, the material of the ink absorbing sponge 82 is a porous sponge.

[0053] According to a specific embodiment of the present invention, an ink injection hole 31 is provided on the drum 30 for adding ink to the ink absorbing sponge 82.

[0054] The usage method and working principle of the scatter point drawing device with random distribution of the present invention are as follows: When in use, place the drum 30 on the test block to be drawn. During the rotation of the drum 30, the magnetic sensor 91 closest to the magnetic sheet 20 responds, so that the voltage in the circuit where the magnetic sensor 91 is located reaches the trigger voltage of the diode 92, causing the corresponding first motor 64 to start working. The output shaft of the first motor 64 rotates to drive the corresponding set of printing dot blocks 40 to change the angle. The diameters of several first gears 61 in the transmission assembly are different, so the track 62 drives the several first gears 61 to rotate by different angles, so that the screw 50 drives the printing dot blocks 40 by different angles, making the angles of the scatter points random.

[0055] During the rotation of the drum 30, the second motor 74 is periodically started. During the rotation of the turntable 73 in the limit assembly, the sliding bar 721 is driven to slide in the arc-shaped slideway of the turntable 73, thereby driving the protrusion or retraction of the arc-shaped edge, and further changing the height by which the printing dot block 40 protrudes from the plane where the arc-shaped edge or the limit ring 75 is located. When the printing dot block 40 contacts the surface of the test block to be drawn, the printing dot block 40 is made of elastic porous material, and the degree of extrusion of the printing dot block 40 is different, so that the cross-sectional area of the contact between the printing dot block 40 and the surface of the test block to be drawn is different, and the size of the scattered dots drawn is random.

[0056] In addition, the shapes of the printing dot blocks 40 are various, which also contributes to the randomness of the scattered dot patterns to a certain extent.

[0057] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present invention. After those skilled in the art have read the above content, various modifications and alternatives to the present invention will be obvious. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims

1. A scatter plotting device with random distribution, characterized in that: The device comprises: a roller support (10), a magnetic sheet (20), a roller (30), a printing block (40), a screw rod (50), a transmission component (60), a limit component (70), an ink supply component and a magnetic trigger circuit; The magnetic sheet (20) is arranged on the roller support (10) opposite to and spaced apart from the side wall of the roller (30); the magnetic sheet (20) is fixed on the roller support (10); and the roller (30) is rotatably arranged on the roller support (10); The roller (30) has a cavity, the ink supply assembly and the transmission assembly (60) are both arranged in the cavity, the limit assembly (70) is arranged at both ends of the cavity and is separated from the ink supply assembly, and the limit assembly (70) is used to control the distance between the roller (30) and the test block to be drawn; A plurality of groups of the printing point blocks (40) are evenly distributed on the surface of the roller (30), and the size and / or cross-sectional shape of each printing point block (40) are different; each printing point block (40) corresponds to a screw rod (50), and each group of printing point blocks (40) corresponds to a transmission assembly (60); one end of the screw rod (50) passes through the surface of the roller (30) and is fixedly connected to the bottom of the printing point block (40), and the other end of the screw rod (50) is fixedly connected to the transmission assembly (60); a motor 1 (64) of the transmission assembly (60) is used to drive the transmission assembly (60) and transmit the transmission to the printing point block (40) to drive the corresponding group of printing point blocks (40) to rotate on the surface of the roller (30) to change the angle of the printing point block (40), so that the drawn scattered points have randomness; The interior of the screw (50) is a hollow structure, and one end of the screw (50) connected to the motor 1 (64) is connected to an ink supply assembly, and is used to transport ink in the ink supply assembly to the printing dot block (40); The magnetic trigger circuit comprises: the magnetic sensitive element (91), a diode (92), a motor one (64) and a power source (93); a plurality of magnetic sensitive elements (91), diodes (92) and motor one (64) connected in series are connected in parallel and electrically connected to the power source (93); the magnetic force of the magnetic sheet (20) is the minimum magnetic force required to make the magnetic sensitive element (91) corresponding to the printing point block (40) closest to it respond; when the magnetic sensitive element (91) responds, the voltage in the magnetic trigger circuit reaches the trigger voltage of the diode (92) in the circuit, so that the motor one (64) in the magnetic trigger circuit starts to work.

2. The scatter plotting device with random distribution according to claim 1, characterized in that: The position limiting assembly (70) comprises: a connecting block (71), a sliding bar (72), a rotating disk (73) and a second motor (74); The connecting block (71) is fixed at both ends of the drum (30) and has a disc-shaped structure, with sliding grooves (711) evenly distributed on the circumference of the disc-shaped structure; The rotating disk (73) is provided with teeth on its circumference, and arc-shaped slideways (731) corresponding to the slide grooves (711) are evenly distributed on its surface; the second motor (74) is used to drive the rotating disk (73) to rotate; The slide bar (72) comprises: a sliding edge, an arcuate edge and a slide bar (721); one end of the sliding edge is fixedly connected to the middle of the arcuate edge, and the other end is fixedly connected to the slide bar (721); the sliding edge is slidably arranged in the slide groove (711), and the slide bar (721) passes through the slide groove (711) and is limited in the arcuate slideway on the surface of the turntable (73).

3. The scatter plotting device with random distribution according to claim 2, characterized in that: A mounting hole is provided at the center of the surface of the rotating disk (73), and the output shaft of the second motor (74) is fixed in the mounting hole; Alternatively, a connecting wheel (76) is sleeved on the output shaft of the second motor (74), and the connecting wheel (76) is meshingly connected to the rotating disk (73).

4. The scatter plotting device with random distribution according to claim 3, characterized in that: A limiting member (11) is rotatably provided at positions on the mounting rod of the roller bracket (10) respectively connected to the two ends of the roller (30), the output shaft of the second motor (74) is fixed in the mounting hole, and the second motor (74) is installed in the cavity of the limiting member (11); Alternatively, the roller bracket (10) is rotatably connected to the turntable (73), and a mounting seat is provided on the roller bracket (10) for mounting the second motor (74).

5. The scatter plotting device with random distribution according to claim 2, characterized in that: The limiting assembly (70) further comprises: a limiting ring (75); The limiting ring (75) comprises: a plurality of fixed parts and telescopic parts, the fixed parts and telescopic parts both having an arc-shaped structure, a telescopic part connected between two adjacent fixed parts, and the telescopic part is inserted into the fixed part and can move relatively, and the fixed part and telescopic part are connected together to form a circular ring shape; Wherein, the fixing portion is fixedly connected to the arc-shaped edge of the sliding bar (72).

6. The scatter plotting device with random distribution according to claim 2, characterized in that: The motor 2 (74) is configured to start and stop at a fixed time; Alternatively, the motor 2 (74) is connected in series with the motor 1 (64), and when the motor 1 (64) is turned on, the motor 2 (74) is also turned on.

7. The scatter plotting device with random distribution according to claim 1, characterized in that: The transmission assembly (60) comprises: a gear 1 (61), a crawler belt (62), a gear 2 (63) and a motor 1 (64); The gear one (61) is sleeved on the side wall of the screw rod (50), the gear two (63) and a plurality of gear ones (61) are all meshed with the track (62), and the output shaft of the motor one (64) is sleeved with the gear two (63).

8. The scatter plotting device with random distribution according to claim 7, characterized in that: The diameters of the plurality of gears 1 (61) are different; Or / and, in the initial state, the angles of the plurality of printing point blocks (40) are different.

9. The scatter plotting device with random distribution according to claim 8, characterized in that: The transmission assembly (60) further comprises: a tensioning wheel and a mounting shaft; A tensioning wheel is arranged between a plurality of adjacent gear ones (61) or / and between a gear two (63) and its adjacent gear one (61), the tensioning wheel being in contact with the surface of the track (62), the tensioning wheel being sleeved on the mounting shaft, and the mounting shaft being fixed in the cavity of the drum (30).

10. The scatter plotting device with random distribution according to any one of claims 1 to 9, characterized in that: The printing block (40) is a terrace-like structure, the cross-sectional area of ​​which decreases in the vertical outward direction, and the material of the printing block (40) is an elastic porous material; Or / and, at least one of the printing dot blocks (40) in each group of printing dot blocks (40) is provided with the magnetic sensitive element (91), or at least one magnetic sensitive element (91) is provided at a position where each group of printing dot blocks (40) is provided on the side wall of the roller (30); Or / and, a main switch is provided in the magnetic trigger circuit or a protective cover is provided on the magnetic sheet (20) so that the magnetic sensitive element (91) does not respond when not in use; Or / and, the ink supply component comprises: an ink stick (81) and an ink absorbing sponge (82); the ink stick (81) is installed in the hollow structure of the screw (50), and the ink absorbing sponge (82) is arranged in the cavity of the roller (30); one end of the ink stick (81) passes through the hollow structure of the screw (50) and is inserted into the bottom of the printing block (40), and the other end is inserted into the ink absorbing sponge (82); Or / and, the roller (30) is provided with an ink injection hole (31) for adding ink to the ink absorbing sponge (82).

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