Compression resistance detection device for mechanical and electrical equipment

Abstract

The utility model discloses a pressure resistance detection device for mechanical and electrical equipment, which relates to the technical field of detection devices and comprises a supporting table, an electric push rod, a fixing component and a cleaning component. When electrical equipment needs to be detected, a part is placed on the supporting plate, the electric push rod is started, the electric push rod works to drive the extrusion block to move downwards, the downward movement of the extrusion block can drive the shell to move downwards through the pulling force of the spring, and when the shell abuts against the supporting table, the extrusion block continues to move downwards at the moment, so that the electrical equipment is detected. The shell can be fixed to the supporting table under the action of spring tension, at the moment, an extrusion block can generate pressure on a part, when the part is broken, fragments splash, are blocked by the shell and are scattered on a supporting plate, a first motor drives the supporting plate to rotate through a rotating shaft, the supporting plate is fixed through a fixing part, and the supporting plate is cleaned through a cleaning part; meanwhile, the other side of the supporting plate can be matched with the extrusion block for continuous detection, so that the working efficiency of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection devices, and particularly relates to a mechanical and electrical equipment compressive strength detection device. Background Technique

[0002] Electrical equipment is a general term for equipment such as generators, transformers, power lines, and circuit breakers in the power system. In order to detect whether the insulation structure of electrical equipment can withstand the overvoltage of the power system, it is usually necessary to use a compressive strength detection device to perform compressive strength detection on it, so as to improve the service life of electrical equipment.

[0003] In the prior art, a Chinese patent with the publication number CN219870771U was proposed to solve the above-mentioned existing technical problems. The technical solution disclosed in the patent document is as follows: A mechanical and electrical equipment compressive strength detection device includes a support base, a cylinder, a pressing block, an electric push rod, a push plate, and a collection box. A cylinder is installed on the top of the support frame, and the bottom end of the telescopic rod of the cylinder is connected to the pressing block through a coupling. An electric push rod is installed at the rear of the support base, and the front end of the output shaft of the electric push rod is fixedly connected to the push plate. The push plate is located inside the support base, and a collection box is slidably arranged at the bottom of the support base. By providing a protective plate, the protective plate can prevent the fragments of the electrical equipment that are crushed from shooting out. By starting the electric push rod, the push plate moves forward to be able to push the mechanical parts on the support base into the collection box at one time, so as to be able to collect the mechanical parts and achieve the purpose of easy collection. However, when the parts are broken during the operation of the device at present, it is necessary to completely clean the parts before the next round of cleaning, which will slow down the working efficiency of the device and the existence of the remaining part debris will affect the test results. Content of the Utility Model

[0004] The purpose of the utility model is to provide a mechanical and electrical equipment compressive strength detection device to solve the problems raised in the above background technique.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A compressive testing device for a mechanical and electrical equipment, comprising a support table, a bracket fixedly connected to the support table, an electric push rod fixedly connected above the bracket, an extrusion block fixedly connected to the output end of the electric push rod, a spring fixedly connected to one end of the extrusion block close to the electric push rod, the other end of the spring fixedly connected to a housing, the housing being slidably connected to the piston rod of the electric push rod, a rotating shaft rotatably connected inside the support table, a first motor and a second motor fixedly connected to both sides of the support table respectively, the output end of the first motor being fixedly connected to the rotating shaft, a support plate fixedly connected to the end of the rotating shaft away from the first motor, a box body fixedly connected below the support table, a collection box slidably connected inside the box body, a handle fixedly connected to one side of the collection box, a cleaning component connected below the support table for cleaning debris, and a fixing component connected to one side of the support table close to the first motor for fixing the support plate.

[0007] When it is necessary to test the electrical equipment, the parts to be tested are placed on the support plate. At this time, the electric push rod is started, and the electric push rod will drive the extrusion block fixedly connected to its output end to move downward. The downward movement of the extrusion block can drive the housing to move downward through the pulling force of the spring. When the housing abuts against the support table, at this time, the extrusion block continues to move downward, and the housing will be fixed on the support table under the action of the spring pulling force. At this time, the extrusion block will exert pressure on the parts. When the parts are broken, the fragments of the parts will fly, and thus will be blocked by the housing and scattered on the support plate. Then the first motor works to drive the support plate to rotate through the rotating shaft, and the support plate is fixed by the fixing component. Then the cleaning component is used to clean the support plate, and at the same time, the other side of the support plate can cooperate with the extrusion block to continue the test, thereby improving the working efficiency of the device.

[0008] A further improvement of the technical solution of the present utility model lies in that: the fixing component includes a clamping member, the clamping member is detachably connected to the rotating shaft, a threaded rod is arranged inside the support table, the threaded rod is threadedly connected to the support table, the threaded rod is perpendicular to the rotating shaft, one end of the threaded rod close to the rotating shaft is rotatably connected to a fixing block, the fixing block is slidably connected to the support table, a knob is fixedly connected to the end of the threaded rod away from the fixing block, a matching groove is opened on the fixing block, and the fixing block is used in cooperation with the clamping member.

[0009] Adopting the above technical solution, in this solution, when the first motor drives the support plate to rotate through the rotating shaft, when the support plate coincides with the surface of the support table, at this time, the knob is twisted, and the rotation of the knob will drive the threaded rod to rotate, thereby pushing the fixing block to abut against the clamping member, so as to achieve the purpose of fixing the support plate. This can prevent the support plate from rotating due to uneven force on the support plate during the operation of the extrusion block. The rotation of the support plate will cause reverse damage to the first motor, thereby reducing the working efficiency of the device.

[0010] A further improvement of the technical solution of the present utility model lies in that: the cleaning component includes a moving block, a chute is provided on the moving block, a lead screw is rotatably connected inside the moving block, one end of the lead screw is fixedly connected to the output end of the second motor, a connecting rod is threadedly connected to the lead screw, the connecting rod is slidably connected to the chute, the connecting rod is slidably connected to the box body, the other end of the connecting rod is fixedly connected to a brush, the brush is located above the collection box, and the width of the box body is equal to the width of the brush and the width of the support plate.

[0011] With the above technical solution, in this solution, when the parts are crushed because they do not meet the standards, at this time the support plate rotates, and the large parts will fall into the collection box along the support plate. However, there are still small parts that will adhere to the surface of the support plate. When the support plate is completely flipped, at this time the second motor starts, and the operation of the second motor will drive the lead screw fixedly connected to its output end to rotate, thereby driving the connecting rod threadedly connected to the lead screw to move along the axis of the lead screw. The movement of the lead screw will drive the brush to clean the surface of the support plate, thereby preventing small parts from remaining and affecting the subsequent test results.

[0012] A further improvement of the technical solution of the present utility model lies in that: the clamping member is composed of two identical balance blocks, the balance blocks are connected to the rotating shaft by bolts, and the balance blocks are used in cooperation with the fitting grooves.

[0013] With the above technical solution, in this solution, by setting the clamping member to be composed of two identical balance blocks and the balance blocks are connected to the rotating shaft by bolts, the balance blocks can be replaced in time after wear, which will greatly improve the working efficiency of the device and reduce the probability of errors in the final experimental results caused by the generation of an angle between the support plate and the support table due to the wear of the balance blocks.

[0014] A further improvement of the technical solution of the present utility model lies in that: a number of limiting blocks are arranged symmetrically and evenly on the support table.

[0015] With the above technical solution, in this solution, by setting the limiting blocks, the position of the housing during operation can be restricted, preventing the housing from shifting during operation and causing deviations in the experimental structure.

[0016] A further improvement of the technical solution of the present utility model lies in that: a smooth layer is provided on the surface of the fitting groove.

[0017] With the above technical solution, in this solution, by providing a smooth layer on the surface of the fitting groove, the wear generated between the balance block and the fitting groove during the process of fixing the balance block can be reduced.

[0018] A further improvement of the technical solution of the present utility model lies in that: a magnet is fixedly connected inside the bottom plate of the collection box.

[0019] With the above technical solution, when the connection detected by the device is a metal part, the small debris generated by the crushing of the metal part due to extrusion is more easily adsorbed into the collection box after being brushed off by the brush, so that the cleaning is more thorough and the working efficiency of the device is improved.

[0020] Due to the adoption of the above technical solution, the technical progress achieved by the present utility model compared with the prior art is as follows:

[0021] 1. The present utility model provides a compressive strength detection device for mechanical and electrical equipment. When it is necessary to detect electrical equipment, the part to be detected is placed on the support plate. At this time, the electric push rod is started, and the electric push rod will drive the extrusion block fixedly connected to its output end to move downward. The downward movement of the extrusion block can drive the housing to move downward through the pulling force of the spring. When the housing abuts against the support table, at this time, the extrusion block continues to move downward, and the housing will be fixed on the support table under the action of the spring pulling force. At this time, the extrusion block will exert pressure on the part. When the part is broken, the fragments of the part will fly, and thus will be blocked by the housing and scattered on the support plate. Then the first motor works to drive the support plate to rotate through the rotating shaft, and the support plate is fixed by the fixing component. Then the cleaning component is used to clean the support plate. At the same time, the other side of the support plate can cooperate with the extrusion block to continue the detection, thereby improving the working efficiency of the device.

[0022] 2. The present utility model provides a compressive strength detection device for mechanical and electrical equipment. When the first motor drives the support plate to rotate through the rotating shaft, when the surface of the support plate coincides with the surface of the support table, at this time, the knob is twisted. The rotation of the knob will drive the threaded rod to rotate, thereby pushing the fixed block to abut against the clamping part, so as to achieve the purpose of fixing the support plate. In this way, it can prevent the support plate from rotating due to uneven force on the support plate during the operation of the extrusion block. The rotation of the support plate will cause reverse damage to the first motor, thereby reducing the working efficiency of the device.

[0023] 3. The present utility model provides a compressive strength detection device for mechanical and electrical equipment. When the part is crushed because it does not meet the standard, at this time, the support plate rotates, and the large parts will fall into the collection box along the support plate. However, there are still small parts adhering to the surface of the support plate. When the support plate is completely turned over, at this time, the second motor is started, and the second motor works to drive the lead screw fixedly connected to its output end to rotate, thereby driving the connecting rod threadedly connected to the lead screw to move along the axis of the lead screw. The movement of the lead screw will drive the brush to clean the surface of the support plate, so as to prevent small parts from remaining and affecting the subsequent detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following further describes the present utility model with reference to the drawings.

[0025] Figure 1It is the first structural schematic diagram of the present utility model;

[0026] Figure 2 It is the second structural schematic diagram of the present utility model;

[0027] Figure 3 It is the cross-sectional structural schematic diagram of the card member of the present utility model;

[0028] Figure 4 It is the sectional structural schematic diagram of the present utility model;

[0029] Figure 5 It is the partial structural schematic diagram of the cleaning component of the present utility model;

[0030] Figure 6 It is the structural schematic diagram of the card member of the present utility model;

[0031] Figure 7 It is the partial structural schematic diagram of the present utility model;

[0032] In the figure: 1, support platform; 2, bracket; 3, electric push rod; 4, extrusion block; 5, spring; 6, housing; 7, rotating shaft; 8, first motor; 9, second motor; 10, support plate; 11, box body; 12, collection box; 13, handle; 14, card member; 15, threaded rod; 16, fixed block; 17, mating groove; 18, knob; 19, moving block; 20, chute; 21, lead screw; 22, connecting rod; 23, brush; 24, balance block; 25, bolt; 26, limit block; 27, smooth layer; 28, magnet. Specific embodiments

[0033] The following further elaborates on the present utility model in conjunction with embodiments:

[0034] Embodiment 1

[0035] As Figure 1 , Figure 2As shown in the figure, the utility model provides a mechanical and electrical equipment compressive detection device, including a support table 1, a bracket 2 is fixedly connected to the support table 1, an electric push rod 3 is fixedly connected above the bracket 2, an extrusion block 4 is fixedly connected to the output end of the electric push rod 3, a spring 5 is fixedly connected to one end of the extrusion block 4 close to the electric push rod 3, the other end of the spring 5 is fixedly connected to a housing 6, the housing 6 is slidably connected to the piston rod of the electric push rod 3, a rotating shaft 7 is rotatably connected inside the support table 1, a first motor 8 and a second motor 9 are respectively fixedly connected to both sides of the support table 1, the output end of the first motor 8 is fixedly connected to the rotating shaft 7, a support plate 10 is fixedly connected to the end of the rotating shaft 7 away from the first motor 8, a box body 11 is fixedly connected below the support table 1, a collection box 12 is slidably connected inside the box body 11, a handle 13 is fixedly connected to one side of the collection box 12, a cleaning component for cleaning debris is connected below the support table 1, and a fixing component for fixing the support plate 10 is connected to one side of the support table 1 close to the first motor 8.

[0036] In this embodiment, when it is necessary to detect the electrical equipment, the parts to be detected are placed on the support plate 10. At this time, the electric push rod 3 is started, and the electric push rod 3 will drive the extrusion block 4 fixedly connected to its output end to move downward. The downward movement of the extrusion block 4 can drive the housing 6 to move downward through the pulling force of the spring 5. When the housing 6 abuts against the support table 1, at this time, the extrusion block 4 continues to move downward, and the housing 6 will be fixed on the support table 1 under the action of the pulling force of the spring 5. At this time, the extrusion block 4 will generate pressure on the parts. When the parts are broken, the fragments of the parts will fly, and thus will be blocked by the housing 6 and scattered on the support plate 10. Then the first motor 8 works to drive the support plate 10 to rotate through the rotating shaft 7, the support plate 10 is fixed by the fixing component, and then the cleaning component is used to clean the support plate 10. At the same time, the other side of the support plate 10 can cooperate with the extrusion block 4 to continue the detection, thereby improving the working efficiency of the device.

[0037] As Figure 3 shown, in this embodiment, preferably, the fixing component includes a clamping part 14, the clamping part 14 is detachably connected to the rotating shaft 7, a threaded rod 15 is arranged inside the support table 1, the threaded rod 15 is threadedly connected to the support table 1, the threaded rod 15 is vertically arranged with respect to the rotating shaft 7, one end of the threaded rod 15 close to the rotating shaft 7 is rotatably connected to a fixing block 16, the fixing block 16 is slidably connected to the support table 1, a knob 18 is fixedly connected to the end of the threaded rod 15 away from the fixing block 16, a matching groove 17 is formed on the fixing block 16, and the fixing block 16 is used in cooperation with the clamping part 14.

[0038] When the first motor 8 drives the support plate 10 to rotate through the rotating shaft 7, when the support plate 10 coincides with the surface of the support table 1, at this time, twist the knob 18. The rotation of the knob 18 will drive the threaded rod 15 to rotate, thereby pushing the fixed block 16 to abut against the clamping member 14, so as to achieve the purpose of fixing the support plate 10. This can prevent the support plate 10 from rotating due to uneven force on the support plate 10 during the operation of the extrusion block 4. The rotation of the support plate 10 will cause reverse damage to the first motor 8, thereby reducing the working efficiency of the device.

[0039] As Figure 4 shown, preferably, the cleaning component includes a moving block 19. A chute 20 is provided on the moving block 19. A lead screw 21 is rotatably connected inside the moving block 19. One end of the lead screw 21 is fixedly connected to the output end of the second motor 9. A connecting rod 22 is threadedly connected to the lead screw 21. The connecting rod 22 is slidably connected to the chute 20. The connecting rod 22 is slidably connected to the box body 11. The other end of the connecting rod 22 is fixedly connected to a brush 23. The brush 23 is located above the collection box 12. The width of the box body 11 is equal to the width of the brush 23 and the width of the support plate 10.

[0040] When the parts are crushed because they do not meet the standards, at this time, the support plate 10 rotates. The large parts will fall into the collection box 12 along the support plate 10, but there are still small parts that will adhere to the surface of the support plate 10. When the support plate 10 is completely flipped, at this time, the second motor 9 is started. The operation of the second motor 9 will drive the lead screw 21 fixedly connected to its output end to rotate, thereby driving the connecting rod 22 threadedly connected to the lead screw 21 to move along the axis of the lead screw 21. The movement of the lead screw 21 will drive the brush 23 to clean the surface of the support plate 10, so as to prevent small parts from remaining and affecting the subsequent test results.

[0041] As Figure 6 shown, preferably, the clamping member 14 is composed of two identical balance blocks 24. The balance blocks 24 are connected to the rotating shaft 7 through bolts 25. The balance blocks 24 are used in cooperation with the mating groove 17.

[0042] By setting the clamping member 14 to be composed of two identical balance blocks 24 and the balance blocks 24 being connected to the rotating shaft 7 through bolts 25, the balance blocks 24 can be replaced in time after wear, which will greatly improve the working efficiency of the device and reduce the probability of an angle being generated between the support plate 10 and the support table 1 due to the wear of the balance blocks 24, resulting in errors in the final experimental results.

[0043] Embodiment 2

[0044] As Figure 4As shown in the figure, on the basis of Embodiment 1, the present utility model provides a technical solution: Preferably, a number of limiting blocks 26 are arranged symmetrically and evenly on the support platform 1.

[0045] In this embodiment, by providing the limiting blocks 26, the position of the housing 6 during operation can be restricted, preventing the housing 6 from shifting during operation and causing deviation in the experimental structure.

[0046] Embodiment 3

[0047] As Figure 6 shown in the figure, on the basis of Embodiment 2, the present utility model provides a technical solution: Preferably, a smooth layer 27 is provided on the surface of the fitting groove 17.

[0048] In this embodiment, by providing the smooth layer 27 on the surface of the fitting groove 17, the wear generated between the balance block 24 and the fitting groove 17 during the process of fixing the balance block 24 can be reduced.

[0049] Embodiment 4

[0050] As Figure 4 shown in the figure, on the basis of Embodiment 3, the present utility model provides a technical solution: Preferably, a magnet 28 is fixedly connected inside the bottom plate of the collection box 12.

[0051] In this embodiment, when the connection detected by the device is a metal part, at this time, the small debris generated by the crushing of the metal part due to extrusion is more likely to be adsorbed into the collection box 12 after being brushed down by the brush 23, so that the cleaning is more thorough and the working efficiency of the device is improved.

[0052] Next, the working principle of this mechanical and electrical equipment compressive strength detection device will be specifically described.

[0053] As Figures 1-7As shown, when it is necessary to detect electrical equipment, the parts to be detected are placed on the support plate 10. At this time, the electric push rod 3 is started, and the electric push rod 3 will drive the extrusion block 4 fixedly connected to its output end to move downward. The downward movement of the extrusion block 4 can drive the housing 6 to move downward through the pulling force of the spring 5. When the housing 6 contacts the support table 1, at this time, the extrusion block 4 continues to move downward, and the housing 6 will be fixed on the support table 1 under the action of the pulling force of the spring 5. At this time, the extrusion block 4 will exert pressure on the parts. When the parts are broken, the fragments of the parts will fly, and thus will be blocked by the housing 6 and scattered on the support plate 10. Then the first motor 8 works to drive the support plate 10 to rotate through the rotating shaft 7, and the support plate 10 is fixed by the fixing component, and then the cleaning component is used to clean the support plate 10. At the same time, the other side of the support plate 10 can cooperate with the extrusion block 4 to continue the detection, thereby improving the working efficiency of the device. When the first motor 8 drives the support plate 10 to rotate through the rotating shaft 7, when the support plate 10 coincides with the surface of the support table 1, at this time, the knob 18 is twisted. The rotation of the knob 18 will drive the threaded rod 15 to rotate, thereby pushing the fixed block 16 to contact the clamping part 14, so as to achieve the purpose of fixing the support plate 10. This can prevent the support plate 10 from rotating due to uneven force on the support plate 10 during the operation of the extrusion block 4. The rotation of the support plate 10 will cause reverse damage to the first motor 8, thereby reducing the working efficiency of the device. When the parts are crushed because they do not meet the standards, at this time, the support plate 10 rotates, and the large parts will fall into the collection box 12 along the support plate 10. However, there are still small parts that will adhere to the surface of the support plate 10. When the support plate 10 is completely flipped, at this time, the second motor 9 is started, and the second motor 9 works to drive the lead screw 21 fixedly connected to its output end to rotate, thereby driving the connecting rod 22 threadedly connected to the lead screw 21 to move along the axis of the lead screw 21. The movement of the lead screw 21 will drive the brush 23 to clean the surface of the support plate 10, so as to prevent small parts from remaining and affecting the subsequent detection results. By setting that the clamping part 14 is composed of two identical balance blocks 24 and the balance blocks 24 are connected to the rotating shaft 7 through bolts 25, the balance blocks 24 can be replaced in time after wear, which will greatly improve the working efficiency of the device and reduce the probability of errors in the final experimental results caused by the generation of an angle between the support plate 10 and the support table 1 due to the wear of the balance blocks 24. By setting the limit block 26, the position of the housing 6 during operation can be limited, preventing the housing 6 from shifting during operation and causing deviation in the experimental structure. By setting a smooth layer 27 on the surface of the fitting groove 17, the wear generated between the balance block 24 and the fitting groove 17 during the fixing process of the balance block 24 can be reduced. When the connection detected by the device is a metal part, at this time, the small debris generated by the extrusion and breaking of the metal part is more likely to be adsorbed into the collection box 12 after being brushed off by the brush 23, so that the cleaning is more thorough and the working efficiency of the device is improved.

[0054] The above has generally described the present utility model in detail. However, based on the present utility model, some modifications or improvements can be made thereto, which are obvious to those of ordinary skill in the art. Therefore, modifications or improvements that do not depart from the spirit and idea of the present utility model are within the protection scope of the present utility model.

Claims

1. A mechanical and electrical equipment compression testing device, comprising a support platform (1); characterized in that: The support platform (1) is fixedly connected to a bracket (2), an electric push rod (3) is fixedly connected to the upper part of the bracket (2), an extrusion block (4) is fixedly connected to the output end of the electric push rod (3), an end of the extrusion block (4) close to the electric push rod (3) is fixedly connected to a spring (5), the other end of the spring (5) is fixedly connected to a shell (6), the shell (6) is slidably connected to the piston rod of the electric push rod (3), a rotating shaft (7) is rotatably connected inside the support platform (1), and a first motor (8) and a second motor are fixedly connected to the two sides of the support platform (1) respectively. (9), the output end of the first motor (8) is fixedly connected to the rotating shaft (7), the end of the rotating shaft (7) away from the first motor (8) is fixedly connected to a support plate (10), a box body (11) is fixedly connected below the support platform (1), a collection box (12) is slidably connected inside the box body (11), a handle (13) is fixedly connected to one side of the collection box (12), a cleaning component for cleaning debris is connected below the support platform (1), and a fixing component for fixing the support plate (10) is connected to the side of the support platform (1) close to the first motor (8).

2. A mechanical and electrical equipment pressure resistance detection device according to claim 1, characterized in that: The fixing component comprises a clamp (14), the clamp (14) is detachably connected to the rotating shaft (7), a threaded rod (15) is arranged inside the support platform (1), the threaded rod (15) is threadedly connected to the support platform (1), the threaded rod (15) and the rotating shaft (7) are arranged vertically, one end of the threaded rod (15) close to the rotating shaft (7) is rotatably connected to a fixing block (16), the fixing block (16) is slidably connected to the support platform (1), one end of the threaded rod (15) away from the fixing block (16) is fixedly connected to a knob (18), a matching groove (17) is provided on the fixing block (16), and the fixing block (16) is used in combination with the clamp (14).

3. A mechanical and electrical equipment pressure resistance detection device according to claim 2, characterized in that: The cleaning component comprises a moving block (19), a sliding groove (20) is provided on the moving block (19), a screw rod (21) is rotatably connected inside the moving block (19), one end of the screw rod (21) is fixedly connected to the output end of the second motor (9), a connecting rod (22) is threadedly connected to the screw rod (21), the connecting rod (22) is slidably connected to the sliding groove (20), the connecting rod (22) is slidably connected to the box body (11), the other end of the connecting rod (22) is fixedly connected to a brush (23), the brush (23) is located above the collection box (12), and the width of the box body (11) is equal to the width of the brush (23) and the width of the support plate (10).

4. A mechanical and electrical equipment pressure resistance detection device according to claim 3, characterized in that: The clamp (14) is composed of two identical balancing blocks (24). The balancing blocks (24) are connected to the rotating shaft (7) via bolts (25). The balancing blocks (24) are used in conjunction with the matching grooves (17).

5. A mechanical and electrical equipment pressure resistance detection device according to claim 4, characterized in that: A plurality of limit blocks (26) are evenly and symmetrically arranged on the support platform (1).

6. A mechanical and electrical equipment pressure resistance detection device according to claim 5, characterized in that: The surface of the matching groove (17) is provided with a smooth layer (27).

7. A mechanical and electrical equipment pressure resistance detection device according to claim 6, characterized in that: A magnet (28) is fixedly connected inside the bottom plate of the collection box (12).

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