Device and method for detecting production strength of high-molecular plastic brush

Abstract

The invention provides a polymer plastic brush production strength detection device and method, the polymer plastic brush production strength detection device comprises a base, the center of the base is fixedly connected with a vertical stand column, the stand column is provided with a liftable annular insertion plate, the circumferential side wall of the annular insertion plate is provided with a plurality of insertion grooves for inserting polymer plastic brush handles, and the insertion grooves are connected with the vertical stand column. A detection cylinder is further fixedly installed on the base and located on the periphery of the stand column, an upper detection ring and a lower detection ring are rotationally connected to a top cylinder opening and a bottom cylinder opening of the detection cylinder respectively, a shaking ring capable of shaking up and down is installed in the upper detection ring, and a plurality of connecting rods are fixedly connected to the circumferential inner wall of the shaking ring in the radial direction; an abutting rod is fixed to the top of the tail end of the connecting rod through a supporting rod. The device can detect a plurality of polymer plastic brushes at the same time, is compact in overall structure, can comprehensively detect the joint of the brush body and the brush handle in the vertical direction and the lateral direction, is comprehensive in detection, and can also detect the stability of bristles.

Description

Technical Field

[0001] The invention relates to the technical field of polymer plastic brush detection, and in particular to a polymer plastic brush production strength detection device and a detection method. Background Art

[0002] Polymer plastic brushes are brushes made of polymer materials, which have excellent wear resistance, corrosion resistance and aging resistance, making them excellent in service life and performance. The bristles of polymer plastic brushes are soft and elastic, which can effectively clean without damaging the surface being cleaned.

[0003] After the production of polymer plastic brushes, their material strength needs to be tested, especially the strength of the connection between the brush body and the brush handle needs to be tested according to usage habits. Existing testing equipment can only test a single brush and cannot perform comprehensive testing on the strength of the connection in the vertical and lateral directions. Summary of the invention

[0004] In view of the above problems, the present invention provides a polymer plastic brush production strength detection device and detection method. The device can detect multiple polymer plastic brushes at the same time. The overall structure is compact and can perform comprehensive detection on the connection between the brush body and the brush handle in the vertical and lateral directions. The detection is comprehensive and can also detect the stability of the bristles.

[0005] To solve the above problems, the technical solution adopted by the present invention is:

[0006] A device for detecting the production strength of a polymer plastic brush comprises a base, a vertical column is fixedly connected to the center of the base, a liftable annular plug-in plate is installed on the column, a plurality of slots for inserting the handles of the polymer plastic brush are provided on the circumferential side walls of the annular plug-in plate, a detection cylinder is also fixedly installed on the base at the periphery of the column, an upper detection ring and a lower detection ring are rotatably connected at the top and bottom openings of the detection cylinder respectively, a shaking ring that can shake up and down is installed in the upper detection ring, a plurality of connecting rods are radially fixedly connected to the circumferential inner wall of the shaking ring, a push rod is fixed to the top of the end of the connecting rod through a support rod, the push rod is used to abut the connection between the brush handle and the brush body, a plurality of pairs of push plates are radially fixedly connected to the circumferential inner wall of the lower detection ring, and each pair of push plates is used to intermittently push the two sides of the brush body.

[0007] Preferably, the base is a conical seat, and the bottom of the detection cylinder is fixedly mounted above the conical seat via a support frame.

[0008] Preferably, a vertical installation cavity is provided in the center of the column, a threaded rod is rotatably connected in the installation cavity, a first motor that can drive the threaded rod to rotate is installed on the top of the column, a lifting arm is threadedly connected to the threaded rod, vertical openings for the two ends of the lifting arm to pass through are provided on both sides of the column, and both ends of the lifting arm are fixedly connected to the inner wall of the annular plug-in plate.

[0009] Preferably, the outer side wall of the upper detection ring is fixedly connected with a first gear ring, the inner wall of the detection cylinder is provided with an upper gear groove corresponding to the first gear ring, the side wall of the detection cylinder is installed with a second motor, the output end of the second motor is fixed with a gear, and the corresponding side of the gear extends into the upper gear groove and meshes with the first gear ring.

[0010] Preferably, vertical first cylinders are fixedly mounted on both side inner walls of the upper detection ring, and the telescopic ends of the first cylinders are fixedly connected to the shaking ring.

[0011] Preferably, a second gear ring is fixed to the outer side wall of the lower detection ring, the inner wall of the detection cylinder is provided with a lower tooth groove corresponding to the second gear ring, a second cylinder is fixed to the side wall of the detection cylinder, a rack meshing with the second gear ring is fixed to the telescopic end of the second cylinder, and the second cylinder adjusts the telescopic stroke through a stroke switch.

[0012] Preferably, radially retractable scrapers are installed on the opposite sides of each pair of the abutment plates, the scrapers are used to radially pull the bristles at the bottom of the brush body, and the top of the abutment plates is used to laterally pull the bristles.

[0013] Preferably, a radial strip groove is provided in the abutment plate, a pull plate is elastically connected to the strip groove via a first spring, a strip opening is provided on the side wall of the abutment plate for the pull plate to pass through, the passing end of the pull plate is fixedly connected to a scraper plate, a conductive head electrically connected to the first spring in a one-to-one correspondence is embedded in the outer side wall of the lower detection ring, a plurality of conductive seats cooperating with the conductive heads are embedded in the circumferential inner wall of the detection cylinder, and the conductive seats are externally connected to a power supply.

[0014] Preferably, a groove is provided at the inner top of the slot, a wedge-shaped stopper is elastically connected to the groove via a second spring, and the bottom surface of the wedge-shaped stopper presses the brush handle.

[0015] The present invention also provides a method for detecting the strength of a polymer plastic brush, comprising the following steps:

[0016] S1. Prepare a plurality of polymer plastic brushes, insert them into a plurality of slots of the annular plug-in plate one by one, and tighten them with a wedge-shaped stopper;

[0017] S2. The annular plug-in plate drives the polymer plastic brush to descend into the detection tube, first descending to the point where multiple push rods touch the connection between the brush handle and the brush body, and then the first cylinder is started to drive the shaking ring to shake up and down, and then the push rods push the connection between the brush handle and the brush body back and forth, and the structural strength of the connection is detected vertically;

[0018] S3. After the vertical detection is completed, the second motor is started, and the upper detection ring is driven to deflect through the gear and the first gear ring, so that the connecting rod and the abutment rod are misaligned with the polymer plastic brush, and the polymer plastic brush continues to descend between multiple pairs of abutment plates, and the second cylinder is started to drive the rack to move back and forth, and then the lower detection ring is driven to rotate back and forth in the forward and reverse directions through the second gear ring. A pair of abutment plates push the brush body back and forth on both sides of the brush, and the structural strength of the connection is detected in the lateral direction. The result is judged by observing the state of the connection;

[0019] S4. After the lateral detection is completed, a pair of abutment plates rise up from the brush body of the polymer plastic brush, so that the bristles are located between the pair of abutment plates, increasing the telescopic stroke of the second cylinder, and then the bristles are pulled back and forth in the lateral direction through the pair of abutment plates, and the bristles are pulled radially through the scraper at the same time, and the stability of the bristles is judged by the amount of bristles falling.

[0020] The beneficial effects of the present invention are:

[0021] 1. Prepare multiple polymer plastic brushes by installing the detection barrel, annular plug-in plate, upper detection ring and lower detection ring, insert them one by one into the multiple circumferential slots of the annular plug-in plate, tighten them with the wedge-shaped block, start the first motor to drive the threaded rod to rotate, drive the annular plug-in plate down to the detection barrel through the lifting arm, and lift them to the upper detection ring and the lower detection ring in sequence to complete the material strength test. It can test multiple polymer plastic brushes at the same time, with the overall annular distribution and compact structure, and can conduct comprehensive vertical and lateral tests on the connection between the brush body and the brush handle, and the test is comprehensive.

[0022] 2. By installing the detection ring, shaking ring and multiple push rods, the annular plug-in plate drives the polymer plastic brush to descend into the detection cylinder, first descending to the point where multiple push rods touch the connection between the brush handle and the brush body, starting the first cylinder to drive the shaking ring to shake up and down, and then the push rods push the connection between the brush handle and the brush body back and forth, causing vertical bending at the connection, and detecting the structural strength of the connection in the vertical direction.

[0023] 3. Install the lower detection ring and multiple pairs of abutment plates, start the second motor, drive the upper detection ring to deflect through the gear and the first gear ring, so that the connecting rod and the abutment rod are misaligned with the polymer plastic brush, and the polymer plastic brush continues to descend between the multiple pairs of abutment plates. Start the second cylinder to drive the rack to move back and forth, and then drive the lower detection ring to rotate back and forth in the forward and reverse directions through the second gear ring. A pair of abutment plates push the brush body back and forth on both sides of the brush, and detect the structural strength of the connection laterally.

[0024] 4. By installing the scraper, after the lateral detection is completed, a pair of abutment plates rise up from the brush body of the polymer plastic brush, so that the bristles are located between the pair of abutment plates, increasing the telescopic stroke of the second cylinder, and then the bristles are pulled back and forth laterally through the pair of abutment plates, and at the same time, the bristles are pulled radially through the scraper to detect the connection stability of the bristles. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure enlargement at point A;

[0027] Figure 3 This is a top view schematic diagram of the upper detection ring proposed by the present invention;

[0028] Figure 4 This is a bottom view schematic diagram of the lower detection ring proposed by the present invention;

[0029] Figure 5 A cross-sectional schematic diagram of the abutment plate proposed by the present invention;

[0030] Figure 6 It is a schematic diagram of the vertical strength detection state of the present invention;

[0031] Figure 7 It is a schematic diagram of the lateral strength detection state of the present invention.

[0032] In the figure: 1 base, 2 detection tube, 3 column, 4 threaded rod, 5 conductive seat, 6 installation cavity, 7 rack, 8 second gear ring, 9 lower detection ring, 10 abutment plate, 11 support frame, 12 scraper, 13 second motor, 14 gear, 15 first gear ring, 16 first cylinder, 17 shaking ring, 18 upper detection ring, 19 connecting rod, 20 abutment rod, 21 annular plug-in plate, 22 first motor, 23 second cylinder, 24 conductive head, 25 first spring, 26 strip groove, 27 vertical mouth, 28 strip mouth, 29 groove, 30 second spring, 31 slot, 32 wedge-shaped abutment block, 33 pull plate. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0035] Reference Figure 1-7 A polymer plastic brush production strength detection device comprises a base 1, a vertical column 3 is fixedly connected at the center of the base 1, a liftable annular plug-in plate 21 is installed on the column 3, a plurality of slots 31 for inserting the handles of the polymer plastic brushes are arranged on the circumferential side wall of the annular plug-in plate 21, a groove 29 is arranged on the inner top of the slot 31, a wedge-shaped stopper 32 is elastically connected in the groove 29 through a second spring 30, and the bottom surface of the wedge-shaped stopper 32 presses the brush handle, and a plurality of polymer plastic brushes are prepared, and are inserted into the plurality of circumferential slots 31 of the annular plug-in plate 21 one by one, and are pressed tightly by the wedge-shaped stopper 32.

[0036] A detection cylinder 2 is also fixedly installed on the base 1 at the periphery of the column 2, and an upper detection ring 18 and a lower detection ring 9 are rotatably connected at the top and bottom tube openings of the detection cylinder 2 respectively. A vertical installation cavity 6 is provided in the center of the column 3, and a threaded rod 4 is rotatably connected in the installation cavity 6. A first motor 22 that can drive the threaded rod 4 to rotate is installed on the top of the column 3, and a lifting arm is threadedly connected to the threaded rod 4. Vertical openings 27 for the two ends of the lifting arm to pass through are provided on both sides of the column 3. Both ends of the lifting arm are fixedly connected to the inner wall of the annular plug-in plate 21. The first motor 22 is started to drive the threaded rod 4 to rotate, and the annular plug-in plate 3 is driven to descend into the detection cylinder 2 through the lifting arm, and then lifted and lowered in the upper detection ring 18 and the lower detection ring 9 in sequence to complete the material strength detection.

[0037] Furthermore, the base 1 is a conical seat, and the bottom of the detection tube 2 is fixedly installed above the conical seat through the support frame 11, and the fallen bristles can slide out along the inclined surface of the conical seat.

[0038] A shaking ring 17 that can shake up and down is installed in the upper detection ring 18. A plurality of connecting rods 19 are radially fixedly connected to the circumferential inner wall of the shaking ring 17. A push rod 20 is fixed to the top of the end of the connecting rod 19 through a support rod. The push rod 20 is used to abut the connection between the brush handle and the brush body. The outer wall of the upper detection ring 18 is fixedly connected to the first gear ring 15. The inner wall of the detection cylinder 2 is provided with an upper tooth groove corresponding to the first gear ring 15. The side wall of the detection cylinder 2 is installed with a second motor 13. The output end of the second motor 13 is fixed with a gear 14. The corresponding side of the gear 14 extends into the upper tooth groove and meshes with the first gear ring 15. The inner walls of both sides of the upper detection ring 18 are fixedly installed with vertical first cylinders 16. The telescopic end of the first cylinder 16 is fixedly connected to the shaking ring 17. Starting the first cylinder 16 drives the shaking ring 17 to shake up and down, and then the connection between the brush handle and the brush body is reciprocated and pushed by the push rod 20. The connection is vertically bent, and the structural strength of the connection is detected in the vertical direction.

[0039] The circumferential inner wall of the lower detection ring 9 is radially fixedly connected with multiple pairs of abutment plates 10, each pair of abutment plates 10 is used to intermittently push the two sides of the brush body, the outer side wall of the lower detection ring 9 is fixed with a second gear ring 8, the inner wall of the detection tube 2 is provided with a lower tooth groove corresponding to the second gear ring 8, the side wall of the detection tube 2 is fixed with a second cylinder 23, the telescopic end of the second cylinder 23 is fixed with a rack 7 meshing with the second gear ring 8, the second cylinder 23 adjusts the telescopic stroke through the stroke switch, starts the second motor 13, and drives the upper detection ring 18 to deflect through the gear 14 and the first gear ring 15, so that the connecting rod 19 and the abutment rod 20 are misaligned with the polymer plastic brush, and the polymer plastic brush continues to descend between the multiple pairs of abutment plates 10, starts the second cylinder 23 to drive the rack 7 to move back and forth, and then drives the lower detection ring 9 to rotate back and forth in both directions through the second gear ring 8, a pair of abutment plates 10 pushes the brush body back and forth in the direction of the brush, and detects the structural strength of the connection in the lateral direction. After the comprehensive strength test, the result is judged by observing the state of the connection.

[0040] In addition, each pair of abutment plates 10 is provided with a radially retractable scraper 12 on the opposite sides thereof, the scraper 12 is used to radially pull the bristles at the bottom of the brush body, and the top of the abutment plates 10 is used to laterally pull the bristles, a radial strip groove 26 is provided in the abutment plates 10, a pull plate 33 is elastically connected to the strip groove 26 through a first spring 25, a strip opening 28 is provided on the side wall of the abutment plates 10 for the pull plate 33 to pass through, the passing end of the pull plate 33 is fixedly connected to the scraper 12, and a conductor 28 is embedded in the outer wall of the lower detection ring 9, which is electrically connected to the first spring 25 in a one-to-one correspondence. The conductive head 24 and the circumferential inner wall of the detection tube 2 are embedded with a plurality of conductive seats 5 that cooperate with the conductive head 24. The conductive seats 5 are connected to an external power source to increase the telescopic stroke of the second cylinder 23, and then the bristles are pulled back and forth in the lateral direction through a pair of abutment plates 10. At this time, the conductive head 24 intermittently contacts the plurality of conductive seats 5, and the first spring 25 is intermittently energized. The first spring 25 is energized and contracts, and the scraper 12 is pulled radially through the pull plate 33. The first spring 25 is de-energized, and the scraper 12 is reset, and then the bristles are pulled radially to detect the connection stability of the bristles.

[0041] Prepare multiple polymer plastic brushes, insert them one by one into the multiple circumferential slots 31 of the annular plug-in plate 21, tighten them through the wedge-shaped block 32, start the first motor 22 to drive the threaded rod 4 to rotate, and drive the annular plug-in plate 3 to descend into the detection tube 2 through the lifting arm, and lift them in sequence to the upper detection ring 18 and the lower detection ring 9 to complete the material strength test.

[0042] The annular plug-in plate 21 drives the polymer plastic brush to descend into the detection tube 2, and first descends to the point where the multiple push rods 20 abut against the connection between the brush handle and the brush body, and then the first cylinder 16 is started to drive the shaking ring 17 to shake up and down, and then the push rods 20 push the connection between the brush handle and the brush body back and forth, causing vertical bending at the connection, and the structural strength of the connection is tested in the vertical direction.

[0043] Start the second motor 13, and drive the upper detection ring 18 to deflect through the gear 14 and the first gear ring 15, so that the connecting rod 19 and the support rod 20 are misaligned with the polymer plastic brush, and the polymer plastic brush continues to descend between the multiple pairs of support plates 10, and start the second cylinder 23 to drive the rack 7 to move back and forth, and then drive the lower detection ring 9 to rotate back and forth in the forward and reverse directions through the second gear ring 8. A pair of support plates 10 push the brush body back and forth on both sides of the brush, and detect the structural strength of the connection in the lateral direction. After the comprehensive strength test, the result is judged by observing the state of the connection.

[0044] After the lateral detection is completed, a pair of abutment plates 10 rise up from the brush body of the polymer plastic brush, so that the bristles are located between the pair of abutment plates 10, increasing the telescopic stroke of the second cylinder 23, and then the bristles are pulled back and forth in the lateral direction through the pair of abutment plates 10. At this time, the conductive head 24 intermittently contacts multiple conductive seats 5, and the first spring 25 is intermittently energized. The first spring 25 is energized and contracts, and the scraper 12 is pulled radially through the pull plate 33. The first spring 25 is de-energized, and the scraper 12 is reset, and then the bristles are pulled radially to detect the connection stability of the bristles, and the stability of the bristles is judged by the amount of bristles falling.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A polymer plastic brush production strength detection device, comprising a base (1), characterized in that: A vertical column (3) is fixedly connected to the center of the base (1), a liftable annular plug-in plate (21) is mounted on the column (3), a plurality of slots (31) for inserting the handles of polymer plastic brushes are provided on the circumferential side wall of the annular plug-in plate (21), a detection cylinder (2) is also fixedly mounted on the base (1) at the periphery of the column (2), an upper detection ring (18) and a lower detection ring (19) are rotatably connected at the top and bottom of the detection cylinder (2). (9), a shaking ring (17) capable of shaking up and down is installed in the upper detection ring (18), a plurality of connecting rods (19) are radially fixedly connected to the circumferential inner wall of the shaking ring (17), a push rod (20) is fixed to the top of the end of the connecting rod (19) through a support rod, and the push rod (20) is used to abut the connection between the brush handle and the brush body, and a plurality of pairs of push plates (10) are radially fixedly connected to the circumferential inner wall of the lower detection ring (9), and each pair of push plates (10) is used to intermittently push the two sides of the brush body.

2. A polymer plastic brush production strength detection device according to claim 1, characterized in that: The base (1) is a conical base, and the bottom of the detection cylinder (2) is fixedly mounted above the conical base via a support frame (11).

3. A polymer plastic brush production strength detection device according to claim 1, characterized in that: A vertical installation cavity (6) is provided at the center of the column (3), a threaded rod (4) is rotatably connected in the installation cavity (6), a first motor (22) is installed on the top of the column (3) for driving the threaded rod (4) to rotate, a lifting arm is threadedly connected to the threaded rod (4), vertical openings (27) are provided on both sides of the column (3) for the two ends of the lifting arm to pass through, and the two ends of the lifting arm are fixedly connected to the inner wall of the annular plug-in plate (21).

4. A polymer plastic brush production strength detection device according to claim 1, characterized in that: The outer wall of the upper detection ring (18) is fixedly connected to a first gear ring (15), the inner wall of the detection cylinder (2) is provided with an upper tooth groove corresponding to the first gear ring (15), and the side wall of the detection cylinder (2) is installed with a second motor (13), the output end of the second motor (13) is fixed with a gear (14), and the corresponding side of the gear (14) extends into the upper tooth groove and meshes with the first gear ring (15).

5. A polymer plastic brush production strength detection device according to claim 1, characterized in that: A vertical first cylinder (16) is fixedly mounted on both inner walls of the upper detection ring (18), and a telescopic end of the first cylinder (16) is fixedly connected to a shaking ring (17).

6. A polymer plastic brush production strength detection device according to claim 1, characterized in that: A second gear ring (8) is fixed to the outer wall of the lower detection ring (9), a lower tooth groove corresponding to the second gear ring (8) is provided on the inner wall of the detection cylinder (2), a second cylinder (23) is fixed to the side wall of the detection cylinder (2), a rack (7) meshing with the second gear ring (8) is fixed to the telescopic end of the second cylinder (23), and the telescopic stroke of the second cylinder (23) is adjusted by a stroke switch.

7. A polymer plastic brush production strength detection device according to claim 1, characterized in that: A radially retractable scraper (12) is installed on the opposite sides of each pair of the abutment plates (10). The scraper (12) is used to radially pull the bristles at the bottom of the brush body, and the top of the abutment plates (10) is used to laterally pull the bristles.

8. A polymer plastic brush production strength detection device according to claim 1, characterized in that: The abutment plate (10) is provided with a radial strip groove (26), and a pull plate (33) is elastically connected to the strip groove (26) via a first spring (25). The side wall of the abutment plate (10) is provided with a strip opening (28) for the pull plate (33) to pass through, and the passing end of the pull plate (33) is fixedly connected to the scraper (12). The outer side wall of the lower detection ring (9) is embedded with a conductive head (24) electrically connected to the first spring (25) in a one-to-one correspondence. The circumferential inner wall of the detection tube (2) is embedded with a plurality of conductive seats (5) that cooperate with the conductive heads (24), and the conductive seats (5) are externally connected to a power supply.

9. A polymer plastic brush production strength detection device according to claim 1, characterized in that: The inner top of the slot (31) is provided with a groove (29), and a wedge-shaped stopper (32) is elastically connected to the groove (29) via a second spring (30), and the bottom surface of the wedge-shaped stopper (32) presses against the brush handle.

10. A detection method based on a polymer plastic brush production strength detection device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, prepare a plurality of polymer plastic brushes, insert them one by one into a plurality of slots (31) of the annular plug-in plate (21), and tighten them with a wedge-shaped stopper (32); S2, the annular plug-in plate (21) drives the polymer plastic brush to descend into the detection tube (2), first descending to the point where the plurality of push rods (20) abut against the connection between the brush handle and the brush body, and starting the first cylinder (16) to drive the shaking ring (17) to shake up and down, and then the push rods (20) push the connection between the brush handle and the brush body back and forth, and the structural strength of the connection is detected in the vertical direction; S3, after the vertical detection is completed, the second motor (13) is started, and the upper detection ring (18) is driven to deflect through the gear (14) and the first gear ring (15), so that the connecting rod (19) and the support rod (20) are misaligned with the polymer plastic brush, and the polymer plastic brush continues to descend between the multiple pairs of support plates (10), and the second cylinder (23) is started to drive the rack (7) to move back and forth, and then the lower detection ring (9) is driven to rotate back and forth in the forward and reverse directions through the second gear ring (8), and the pair of support plates (10) push the brush body back and forth in the directions on both sides of the brush, and the structural strength of the connection is detected in the lateral direction, and the result is judged by observing the state of the connection; S4. After the lateral detection is completed, a pair of abutment plates (10) rise from the brush body of the polymer plastic brush, so that the bristles are located between the pair of abutment plates (10), increasing the telescopic stroke of the second cylinder (23), and then the bristles are reciprocated in the lateral direction through the pair of abutment plates (10), and the bristles are pulled radially through the scraper (12), and the stability of the bristles is judged by the amount of bristles falling.

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