Plasterboard sample plate cutting equipment

Abstract

The invention relates to the technical field of plasterboard cutting, and discloses plasterboard sample plate cutting equipment which comprises a conveying assembly, a cutting assembly and a cutting assembly. The cutting assembly is used for cutting the plasterboard sample plate; the positioning assembly is arranged in the conveying direction of the plasterboard sample plate, and the positioning assembly is used for positioning the position of the plasterboard sample plate conveyed on the conveying assembly; wherein the positioning assembly comprises a positioning plate, a conveying channel is formed in the positioning plate, and the conveying assembly can convey the plasterboard sample plate to penetrate through the conveying channel. According to the gypsum board sample plate cutting device, the front end of the gypsum board sample plate is intercepted through the baffle in the gypsum board sample plate conveying process, so that the cutting length of the gypsum board sample plate is positioned, the front end of the gypsum board sample plate is limited through the baffle in the gypsum board sample plate cutting process, the gypsum board sample plate can be prevented from deviating, and therefore the gypsum board cutting accuracy is improved.

Description

Technical Field

[0001] The invention relates to the technical field of gypsum board cutting, and in particular to a gypsum board sample cutting device. Background Art

[0002] In the production process of gypsum board production line, multiple steps include: calcination area, addition area, mixing area, molding area, finished product area, and packaging area. In the finished product area, the gypsum board samples need to be cut according to production needs to obtain gypsum boards of appropriate sizes.

[0003] In the existing gypsum board production line, the gypsum board samples are transported between different sections by the conveying component, and the cutting component cuts the gypsum board samples. The other end of the gypsum board sample on the conveying component is not restricted. During the cutting process, the gypsum board sample is easily skewed, resulting in poor cutting accuracy of the gypsum board sample, affecting the quality of the finished gypsum board products. It is also necessary to manually grind and further cut the finished gypsum boards with cutting errors, which consumes a lot of labor costs and time costs. Therefore, a device that can automatically cut samples is developed. Summary of the invention

[0004] The object of the present invention is to provide a gypsum board sample cutting device to solve the technical problem in the prior art that when the gypsum board sample is cut, the other end of the gypsum board sample is not restricted, thereby affecting the cutting accuracy of the gypsum board sample.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] A gypsum board sample cutting device, a transmission component, the transmission component is used to continuously transport the gypsum board sample;

[0007] A cutting assembly, the cutting assembly is used to cut the gypsum board sample;

[0008] A positioning component, the positioning component is arranged in the conveying direction of the gypsum board sample, and the positioning component is used to locate the position of the gypsum board sample conveyed on the conveying component;

[0009] Among them, the positioning component includes a positioning plate, on which a transmission channel is opened. The transmission component can transport the gypsum board sample through the transmission channel. A baffle is installed in the transmission channel through a telescopic part. The baffle is raised and lowered in the transmission channel to block the transmission of the gypsum board sample.

[0010] As a preferred solution of the present invention, the cutting assembly includes a slide rail, the length direction of the slide rail is perpendicular to the transmission direction of the gypsum board sample, a sliding trolley that can slide along its length direction is provided in the slide rail, a lifting assembly is installed on the sliding trolley, the telescopic end of the lifting assembly is connected to a cutting motor through a mounting seat, and a cutting head is connected to the output end of the cutting motor.

[0011] As a preferred solution of the present invention, a distance adjusting component is provided between the cutting component and the positioning plate, and the distance adjusting component is used to change the distance between the cutting component and the positioning plate to change the cutting length of the gypsum board sample.

[0012] As a preferred solution of the present invention, the distance adjustment assembly includes a lead screw mounted on the positioning plate, and the length direction of the lead screw is parallel to the conveying direction of the gypsum board sample, and a servo motor for driving the lead screw to rotate is also arranged on the positioning plate;

[0013] A sliding seat is installed on the lead screw through a lead screw nut. The sliding seat can move along the length direction of the lead screw, and the slide rail is fixedly installed on the sliding seat.

[0014] As a preferred solution of the present invention, it also includes a dust exhaust component, which is arranged below the cutting component and is used to extract dust generated by the gypsum board sample being cut by the cutting component.

[0015] As a preferred solution of the present invention, the dust exhaust assembly includes an air hood and an exhaust fan. The air hood is arranged below the cutting head. The air inlet end of the exhaust fan is connected to the air hood through a connecting pipe. The exhaust fan drives the air hood to suck the dust generated by the cutting of the gypsum board sample.

[0016] As a preferred solution of the present invention, a slide groove is provided in the baffle plate, a grinding piece is provided in the slide groove, and the grinding piece is in sliding contact with the slide groove, an open groove is provided between the side surface of the baffle plate and the slide groove, and the open groove faces the gypsum board sample, and the cross section of the gypsum board sample can pass through the open groove and abut against the side surface of the baffle plate;

[0017] A driving mechanism is arranged on the positioning plate, and the driving mechanism is used to drive the grinding member to slide back and forth in the slide groove so as to grind the cross section of the gypsum board sample.

[0018] As a preferred solution of the present invention, the driving mechanism includes a flow cavity opened in the positioning plate, a fan blade is rotatably installed in the flow cavity through a rotating shaft, and the air outlet end of the exhaust fan is connected to the flow cavity;

[0019] A reciprocating mechanism is provided between the rotating shaft and the grinding piece, and the rotating shaft drives the grinding piece to slide back and forth in the sliding groove through the reciprocating mechanism.

[0020] As a preferred embodiment of the present invention, the polishing piece includes a base plate, a mounting groove is opened on the side of the base plate, a friction block is arranged in the mounting groove, and the friction block is in sliding contact with the wall of the mounting groove, and a spring is arranged between the friction block and the mounting groove, and under the elastic force of the spring, the friction block always presses against the cross-section of the gypsum board sample.

[0021] As a preferred solution of the present invention, the reciprocating mechanism includes a first magnetic block installed on a rotating shaft, and a second magnetic block is connected to the substrate. The two magnetic poles of the first magnetic block are arranged along the diameter of the rotating shaft. The rotating shaft drives the first magnetic block to rotate, and the two magnetic poles of the first magnetic block are intermittently opposite to one of the magnetic poles of the second magnetic block.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In the present invention, during the transmission of the gypsum board sample, its front end is intercepted by the baffle, so as to position the cutting length of the gypsum board sample, and during the cutting process of the gypsum board sample, its front end is limited by the baffle, which can avoid the gypsum board sample from being skewed, thereby improving the accuracy of gypsum board cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0025] Figure 1 A schematic structural diagram of a gypsum board sample cutting device is provided for an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the structure of a baffle in a gypsum board sample cutting device is provided for an embodiment of the present invention;

[0027] Figure 3 for Figure 1 The enlarged view of point A in the middle;

[0028] Figure 4 A schematic structural diagram of a distance adjustment component in a gypsum board sample cutting device is provided for an embodiment of the present invention;

[0029] The numbers in the figure represent the following:

[0030] 1 transmission component, 2 positioning plate, 3 transmission channel, 4 telescopic part;

[0031] 5 baffle, 501 slide slot, 502 opening slot;

[0032] 6 lead screw, 7 sliding seat, 8 slide rail, 9 lifting assembly, 10 cutting motor, 11 cutting blade, 12 air collecting cover, 13 exhaust fan, 14 circulation cavity, 15 rotating shaft, 16 fan blade, 17 first magnetic block, 18 second magnetic block;

[0033] 19 polishing part, 1901 base plate, 1902 mounting groove, 1903 friction block, 1904 spring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figure 1 As shown, the present invention provides a gypsum board sample cutting device, which has:

[0036] The transmission component 1 is used for continuously conveying gypsum board samples.

[0037] Cutting component, the cutting component is used to cut the gypsum board sample.

[0038] The positioning component is arranged in the conveying direction of the gypsum board sample, and the positioning component is used to position the gypsum board sample transmitted on the transmission component 1.

[0039] The positioning assembly includes a positioning plate 2, on which a transmission channel 3 is provided, and the transmission assembly 1 can transport the gypsum board sample through the transmission channel 3. A baffle 5 is installed in the transmission channel 3 through a telescopic member 4, and the baffle 5 is raised and lowered in the transmission channel 3 to block the transmission of the gypsum board sample;

[0040] Among them, the telescopic part 4 is an electric push rod, and a monitor is arranged on the side of the baffle 5 facing the gypsum board sample. The monitor and the electric push rod are communicated with the external controller. The monitor is used to monitor whether the gypsum board sample is against the side of the baffle 5. When the monitor detects that the gypsum board sample is against the side of the baffle 5, the controller controls the cutting component to start and controls the transmission component 1 to stop.

[0041] During operation, a plurality of gypsum board samples are placed on the transmission component 1, and the transmission component 1 is used to transport the plurality of gypsum board samples one by one to the cutting component for cutting.

[0042] During the conveying process of the gypsum board sample, the telescopic part 4 first lifts the baffle 5, the front end of the gypsum board sample is blocked by the baffle 5, the transmission component 1 stops, and then the cutting component is started to cut the gypsum board sample. Since the distance between the cutting component and the positioning plate 2 is known, the cutting length of the gypsum board sample by the cutting component is fixed each time. After the cutting of the gypsum board sample is completed, the cutting component is reset, and the telescopic part 4 drives the baffle 5 to sink, and the cut gypsum board product is driven and transmitted through the transmission component 1, and the gypsum board product passes through the transmission channel 3 to enter the next process.

[0043] Among them, when cutting, the front end of the gypsum board sample is against the baffle, so when the cutting component cuts it, its position can be limited to avoid deflection, thereby improving the appearance quality of the finished gypsum board.

[0044] In this embodiment, refer to Figure 1 and Figure 4 As shown, the cutting assembly includes a slide rail 8, the length direction of the slide rail 8 is perpendicular to the transmission direction of the gypsum board sample, and the length direction of the slide rail 8 is the cutting direction of the gypsum board sample, and a sliding trolley that can slide along its length direction is provided in the slide rail 8, and a lifting assembly 9 is installed on the sliding trolley. The telescopic end of the lifting assembly 9 is connected to a cutting motor 10 through a mounting seat, and a cutting head 11 is connected to the output end of the cutting motor 10.

[0045] After the gypsum board sample is transmitted to the specified position by the transmission component 1, the cutting motor 10 drives the cutting head 11 to rotate, and the lifting component 9 drives the cutting motor 10 to descend to cut the gypsum board sample. Synchronously, the slide rail 8 drives the lifting component 9 to move through the sliding trolley, thereby completely cutting the gypsum board sample.

[0046] During the process of cutting the gypsum board sample into finished products, the length of the gypsum board cutting will change according to the requirements of the next process. In order to meet this requirement, this embodiment proposes the following solution to solve the above problem:

[0047] In this embodiment, refer to Figure 1 As shown, a distance-adjusting component is provided between the cutting component and the positioning plate 2, and the distance-adjusting component is used to change the distance between the cutting component and the positioning plate 2. Since the positioning plate 2 is fixed, the front end of the gypsum board sample is against the baffle in the positioning plate 2 during transportation, and the distance between the cutting component and the positioning plate 2 changes. Then, the distance between the cutting position of the gypsum board sample and the front end of the gypsum board sample changes, thereby changing the cut length of the gypsum board to meet the processing requirements of gypsum board products of different sizes.

[0048] In order to realize the function of the above-mentioned distance adjustment component, in this embodiment, refer to Figure 1As shown, the distance adjustment assembly includes a lead screw 6 installed on the positioning plate 2, and the length direction of the lead screw 6 is parallel to the conveying direction of the gypsum board sample. A servo motor for driving the lead screw 6 to rotate is also arranged on the positioning plate 2.

[0049] A sliding seat 7 is installed on the lead screw 6 through a lead screw nut, and a plurality of guide rods parallel to the lead screw 6 are also installed on the positioning plate 2, and the sliding seat 7 is slidably connected to the plurality of guide rods. The sliding seat 7 can move along the length direction of the lead screw 6, and the slide rail 8 is fixedly installed on the sliding seat 7.

[0050] Furthermore, an infrared rangefinder is provided on the sliding seat 7, and an infrared receiver facing the infrared rangefinder is provided on the positioning plate 2. The infrared rangefinder and the infrared receiver are used to monitor the distance between the sliding seat 7 and the positioning plate 2 in real time, so as to accurately adjust the distance between the sliding seat 7 and the positioning plate 2.

[0051] When the cutting components cut the gypsum board samples, a lot of dust will be generated, which will pollute the working environment on site. To this end, we propose the following solutions to solve the above problems:

[0052] In this embodiment, refer to Figure 1 As shown, it also includes a dust exhaust component, which is arranged below the cutting component. When the cutting component cuts the gypsum board sample, the dust generated by the cutting of the gypsum board sample is sucked out through the dust exhaust component, thereby avoiding dust accumulation at the work site.

[0053] In this embodiment, refer to Figure 1 As shown, the dust exhaust assembly includes an air hood 12 and an exhaust fan 13. The air hood 12 is arranged below the cutting head 11. The air inlet end of the exhaust fan 13 is connected to the air hood 12 through a connecting pipe. The exhaust fan 13 drives the air hood 12 to suck the dust generated by the cutting of the gypsum board sample.

[0054] Among them, the length of the air collecting hood 12 is slightly larger than the diameter of the cutting head 11. A linear motor is arranged under the transmission component 1. The air collecting hood 12 is installed on the output end of the linear motor, and the driving route of the linear motor for the air collecting hood 12 is the same as the path of the slide rail 8. When the sliding trolley drives the cutting motor 10 to move, the linear motor drives the air collecting hood 12 to move synchronously with the cutting head 11, so that the air collecting hood 12 is always opposite to the cutting head 11, thereby extracting the dust generated by the cutting of the gypsum board sample.

[0055] Compared with the long slot-shaped air collecting hood 12, the air collecting hood 12 is more targeted in sucking dust, and the exhaust fan 13 running at low power can make the air collecting hood 12 have a greater suction force, thereby completing the extraction of dust generated by cutting the gypsum board sample.

[0056] After the gypsum board sample is cut, there are burrs on the cross section. If it is not polished and removed, the appearance quality of the gypsum board product will be reduced. To this end, we propose the following solution to solve the above problem:

[0057] In this embodiment, refer to Figure 2 As shown, a slide groove 501 is opened in the baffle plate 5, a polishing piece 19 is arranged in the slide groove 501, and the polishing piece 19 is in sliding contact with the slide groove 501, an open groove 502 is opened between the side of the baffle plate 5 and the slide groove 501, and the open groove 502 faces the gypsum board sample, and the cross-section of the gypsum board sample can pass through the open groove 502 and abut against the side of the baffle plate 5.

[0058] A driving mechanism is provided on the positioning plate 2, and the driving mechanism is used to drive the grinding member 19 to slide back and forth in the slide groove 501 so as to grind the cross section of the gypsum board sample.

[0059] When the transmission component 1 transports the gypsum board sample to the positioning plate 2, the cross-section of the gypsum board sample abuts against the polishing piece 19 in the baffle 5, and the polishing piece 19 is driven by the driving mechanism to slide back and forth on the cross-section of the gypsum board sample, thereby polishing the cross-section of the gypsum board sample to remove burrs and improve the appearance quality of the finished gypsum board cut product.

[0060] Furthermore, the operation of the driving mechanism can be carried out simultaneously with the operation of the cutting assembly without interfering with each other, so as to prevent the grinding work on the cross section of the gypsum board sample from affecting the efficiency of the cutting assembly in cutting the gypsum board sample.

[0061] In order to realize the driving mechanism to drive the grinding member 19, in this embodiment, referring to Figure 3 As shown, the driving mechanism includes a circulation cavity 14 opened in the positioning plate 2 , in which a fan blade 16 is rotatably installed via a rotating shaft 15 , and an air outlet end of the exhaust fan 13 is connected to the circulation cavity 14 .

[0062] A reciprocating mechanism is provided between the rotating shaft 15 and the polishing piece 19. When the exhaust fan 13 operates to extract the dust generated by cutting the gypsum board sample, the exhaust air impacts the fan blades 16, and the kinetic energy of the exhaust air is used to drive the fan blades 16 to rotate. The fan blades 16 further drive the rotating shaft 15 to rotate, providing driving force for the rotating shaft 15. The rotating shaft 15 drives the polishing piece 19 to slide back and forth in the slide groove 501 through the reciprocating mechanism.

[0063] After the gypsum board sample is initially against the polishing surface of the side of the polishing piece 19, whether it is the cutting of the gypsum board sample by the cutting assembly or the polishing of the gypsum board sample by the polishing piece 19, the gypsum board sample will shake, resulting in separation between the gypsum board sample and the polishing piece 19, which in turn weakens the polishing effect of the polishing piece 19 on the gypsum board sample. Even if the distance between the gypsum board sample and the polishing piece 19 is too large, the movement of the polishing piece 19 cannot have a polishing effect on the gypsum board sample. To this end, we propose the following solution to solve the above problem:

[0064] In this embodiment, refer to Figure 2 As shown, the polishing member 19 includes a base plate 1901, a mounting groove 1902 is opened on the side of the base plate 1901, a friction block 1903 is arranged in the mounting groove 1902, and the friction block 1903 is in sliding contact with the groove wall of the mounting groove 1902, and a spring 1904 is arranged between the friction block 1903 and the mounting groove 1902. Under the elastic force of the spring 1904, the polishing surface of the friction block 1903 extends out of the mounting groove 1902 and always contacts the cross-section of the gypsum board sample, so that the cross-section of the gypsum board sample can always be polished.

[0065] Furthermore, after the friction block 1903 has been used for a long time, even if the thickness of the friction block 1903 becomes thinner, under the elastic force of the spring 1904, the friction surface of the friction block 1903 can always be offset against the cross-section of the gypsum board sample, which can extend the service life of the friction block 1903 compared to the fixed grinding piece 19.

[0066] In this embodiment, refer to Figure 2 and Figure 3 As shown, the reciprocating mechanism includes a first magnetic block 17 mounted on the rotating shaft 15, and a second magnetic block 18 is connected to the substrate 1901. The two magnetic poles of the first magnetic block 17 are arranged along the diameter of the rotating shaft 15, and the two magnetic poles of the second magnetic block 18 are arranged in the vertical direction.

[0067] When the driving mechanism drives the rotating shaft 15 to rotate, the rotating shaft 15 drives the first magnetic block 17 to rotate synchronously, and the two magnetic poles of the first magnetic block 17 intermittently face one of the magnetic poles of the second magnetic block 18. When the first magnetic block 17 and the second magnetic block 18 are facing each other with the same poles, under the action of the magnetic repulsion between the first magnetic block 17 and the second magnetic block 18, the second magnetic block 18 drives the polishing piece 19 to move downward. When the first magnetic block 17 and the second magnetic block 18 are facing each other with opposite poles, under the action of the magnetic attraction between the first magnetic block 17 and the second magnetic block 18, the second magnetic block 18 drives the polishing piece 19 to rise, so as to realize the up and down reciprocating motion of the polishing piece 19, thereby polishing the gypsum board sample that is against the friction block 1903.

[0068] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A gypsum board sample cutting device, characterized in that: have: A transmission assembly (1), the transmission assembly being used for continuously conveying gypsum board samples; A cutting assembly, the cutting assembly is used to cut the gypsum board sample; A positioning component, the positioning component is arranged in the conveying direction of the gypsum board sample, and the positioning component is used to locate the position of the gypsum board sample conveyed on the conveying component (1); The positioning assembly comprises a positioning plate (2), a transmission channel (3) is provided on the positioning plate (2), the transmission assembly (1) can transport the gypsum board sample through the transmission channel (3), a baffle (5) is installed in the transmission channel (3) through a telescopic member (4), and the baffle (5) is raised and lowered in the transmission channel (3) to block the transmission of the gypsum board sample.

2. A gypsum board sample cutting device according to claim 1, characterized in that: The cutting assembly comprises a slide rail (8), the length direction of the slide rail (8) being perpendicular to the transmission direction of the gypsum board sample, a sliding trolley which can slide along its length direction is arranged in the slide rail (8), a lifting assembly (9) is installed on the sliding trolley, the telescopic end of the lifting assembly (9) is connected to a cutting motor (10) via a mounting seat, and a cutting blade head (11) is connected to the output end of the cutting motor (10).

3. A gypsum board sample cutting device according to claim 2, characterized in that: A distance adjustment component is provided between the cutting component and the positioning plate (2), and the distance adjustment component is used to change the distance between the cutting component and the positioning plate (2) so as to change the length of the gypsum board sample cut.

4. A gypsum board sample cutting device according to claim 3, characterized in that: The distance adjustment component comprises a lead screw (6) mounted on the positioning plate (2), and the length direction of the lead screw (6) is parallel to the conveying direction of the gypsum board sample, and a servo motor for driving the lead screw (6) to rotate is also arranged on the positioning plate (2); A sliding seat (7) is installed on the lead screw (6) via a lead screw nut; the sliding seat (7) is movable along the length direction of the lead screw (6), and the slide rail (8) is fixedly installed on the sliding seat (7).

5. A gypsum board sample cutting device according to claim 4, characterized in that: It also includes a dust exhaust component, which is arranged below the cutting component and is used to extract dust generated by the gypsum board sample being cut by the cutting component.

6. A gypsum board sample cutting device according to claim 5, characterized in that: The dust exhaust assembly comprises an air collecting hood (12) and an exhaust fan (13); the air collecting hood (12) is arranged below the cutting blade (11); an air inlet end of the exhaust fan (13) is connected to the air collecting hood (12) via a connecting pipe; the exhaust fan (13) drives the air collecting hood (12) to absorb dust generated by cutting the gypsum board sample.

7. A gypsum board sample cutting device according to claim 6, characterized in that: A slide groove (501) is provided in the baffle plate (5), a grinding piece (19) is arranged in the slide groove (501), and the grinding piece (19) is in sliding contact with the slide groove (501), an open groove (502) is provided between the side surface of the baffle plate (5) and the slide groove (501), and the open groove (502) faces the gypsum board sample, and the cross section of the gypsum board sample can pass through the open groove (502) and abut against the side surface of the baffle plate (5); A driving mechanism is provided on the positioning plate (2), and the driving mechanism is used to drive the grinding member (19) to slide back and forth in the slide groove (501) so as to grind the cross section of the gypsum board sample.

8. The gypsum board sample cutting device according to claim 7, characterized in that: The driving mechanism comprises a circulation cavity (14) provided in the positioning plate (2), a fan blade (16) being rotatably mounted in the circulation cavity (14) via a rotating shaft (15), and an air outlet end of the exhaust fan (13) being in communication with the circulation cavity (14); A reciprocating mechanism is provided between the rotating shaft (15) and the grinding piece (19), and the rotating shaft (15) drives the grinding piece (19) to slide back and forth in the sliding groove (501) through the reciprocating mechanism.

9. The gypsum board sample cutting device according to claim 8, characterized in that: The polishing member (19) comprises a base plate (1901), a mounting groove (1902) is provided on the side of the base plate (1901), a friction block (1903) is provided in the mounting groove (1902), and the friction block (1903) is in sliding contact with the groove wall of the mounting groove (1902), a spring (1904) is provided between the friction block (1903) and the mounting groove (1902), and under the elastic force of the spring (1904), the friction block (1903) always abuts against the cross section of the gypsum board sample.

10. A gypsum board sample cutting device according to claim 9, characterized in that: The reciprocating mechanism comprises a first magnetic block (17) mounted on a rotating shaft (15), and a second magnetic block (18) connected to the substrate (1901). The two magnetic poles of the first magnetic block (17) are arranged along the diameter of the rotating shaft (15). The rotating shaft (15) drives the first magnetic block (17) to rotate, and the two magnetic poles of the first magnetic block (17) intermittently face one of the magnetic poles of the second magnetic block (18).

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