A photoelectric travel limit switch

Abstract

The invention relates to the technical field of photoelectric switches, specifically a photoelectric travel limit switch, including a photoelectric switch body emitting surface fixedly mounted with a shell, a semicircular groove is provided on the side of the shell away from the photoelectric switch body, a motor is fixedly connected to the middle of the shell, a lens is fixedly mounted on the motor output shaft, the lens is circular, a fixed plate 1 is fixedly mounted on the inner wall of the shell away from the photoelectric switch body through multiple springs, a brush plate is fixedly mounted on one end of the fixed plate 1 close to the lens, multiple springs 1 are horizontally fixedly mounted on the inner wall of the shell away from the photoelectric switch body, and a fixed plate 2 is fixedly mounted on the upper end of the inner side wall of the shell through spring 2. The present invention cooperates with spring 1, fixed plate 1 and brush plate, so that the bristles on the brush plate are always in contact with the lens. When the motor drives the lens to rotate, the bristles on the brush plate can stably brush away the dust and dirt on the lens, thereby improving the overall stability.

Description

Technical Field

[0001] The invention relates to the technical field of photoelectric switches, in particular to a photoelectric travel limit switch. Background Art

[0002] Photoelectric switch is the abbreviation of photoelectric proximity switch. It uses the object to block or reflect the light beam, and the synchronous circuit connects the circuit to detect the presence of the object. Objects are not limited to metals. All objects that can reflect light (or block light) can be detected. The photoelectric switch converts the input current into a light signal on the transmitter, and the receiver detects the target object based on the strength or presence of the received light. Photoelectric switch smoke alarms are common in security systems, and they are often used in industry to count the number of movements of robotic arms.

[0003] Photoelectric switches have certain requirements for the working environment. Try to avoid: places with a lot of dust; places with a lot of corrosive gases; places where water, oil, and chemicals may splash directly; places where there is direct sunlight or strong light without shading measures outdoors; places where the ambient temperature changes beyond the specified range of the product; places with large vibrations and impacts but no shock-absorbing measures; these working environments may cause the photoelectric switch to malfunction.

[0004] However, some dusty working environments may require the use of photoelectric switches, such as flour mills, stone processing plants, etc. However, when the photoelectric switches work for a long time, dust and powder will adhere to the photoelectric switches, which will affect the infrared light and affect the use of the photoelectric switches.

[0005] Therefore, a photoelectric travel limit switch is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a photoelectric travel limit switch, which can solve the problems raised in the above background technology by arranging a brush plate, a rotating roller and a magic sponge to clean off dirty materials such as dust and powder attached to the lens.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A photoelectric travel limit switch, comprising a photoelectric switch body and a cleaning device matched with the photoelectric switch body, wherein the cleaning device comprises:

[0009] A housing, the emitting surface of the photoelectric switch body is fixedly mounted with the housing, and a semicircular groove is provided on the side of the housing away from the photoelectric switch body;

[0010] A motor is fixedly connected to the middle of the housing;

[0011] A lens is fixedly mounted on the motor output shaft, and the lens is circular;

[0012] Also includes:

[0013] A cleaning device is fixedly installed on the inner wall of the shell on the side away from the photoelectric switch body.

[0014] The cleaning device comprises a fixing plate 1 fixedly mounted on the inner wall of the housing away from the photoelectric switch body by a plurality of springs 1, and a brush plate is fixedly mounted on one end of the fixing plate 1 close to the lens.

[0015] A plurality of springs are fixedly installed horizontally on the inner wall of the housing away from the photoelectric switch body.

[0016] A second fixing plate is fixedly installed on the upper end of the inner side wall of the shell through a second spring, and connecting rods are fixedly connected to both ends of the second fixing plate, and a roller is rotatably connected between the two connecting rods, and a layer of magic sponge is wrapped around the roller, and a right angle of ninety degrees is formed between the second fixing plate and the first fixing plate, a water storage box is provided on the top inner wall of the shell, a water pipe is provided inside the roller, and a sleeve is fixedly installed in the connecting rod near one end of the water storage box, a hose is connected to the outside of the water storage box, the hose passes through the connecting rod and is fixedly connected to the sleeve, and the other end of the sleeve is rotatably connected to the water pipe, an electromagnetic valve is provided on the hose, and the electromagnetic valve is electrically connected to the motor, and a plurality of fine holes are provided on the water pipe and the roller.

[0017] The aqueous solution inside the water storage box is glass water.

[0018] The shell is provided with two slideways symmetrically arranged on the inner wall of the photoelectric switch body, close to the inner wall of the photoelectric switch body, and the photoelectric switch body is provided with a convenient fixing device for fixing with the shell, and the convenient fixing device cooperates with the slideways.

[0019] The convenient fixing device includes two telescopic rods fixedly installed on both sides of the photoelectric switch body, and the two telescopic rods are connected to an extrusion head through a spring, and the two extrusion heads cooperate with the slideway. The inner wall of the shell is provided with a bayonet that cooperates with the two telescopic rods, and the two bayonet are both located on the slideway.

[0020] A rubber pad 1 is arranged between both sides of the photoelectric switch body and the shell, and the rubber pad 1 cooperates with the slideway.

[0021] A rubber pad 2 which cooperates with the semicircular groove is fixedly installed on the inner wall of the shell where the semicircular groove is provided.

[0022] The lens is made of highly transparent acrylic material.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The photoelectric travel limit switch described in the present invention cooperates with a spring, a fixed plate and a brush plate so that the bristles on the brush plate are always in contact with the lens. When the motor drives the lens to rotate, the bristles on the brush plate can stably brush away the dust and dirt on the lens, thereby improving the overall stability.

[0025] 2. The photoelectric travel limit switch described in the present invention is provided with a rotating roller and a magic sponge, so that the rotating roller rotates due to the friction between the roller and the lens, driving the magic sponge to rotate to preliminarily clean the dust and dirt adhered to the lens, and because the magic sponge is soaked with the aqueous solution, the lens is then soaked, so that the brush plate can better brush off the dust and dirt on the lens when cleaning the lens, further improving the stability of the photoelectric switch body.

[0026] 3. The photoelectric travel limit switch described in the present invention has a rubber pad 2 fixedly installed on the inner wall of the semicircular groove of the shell, which cooperates with the semicircular groove, so that external dust and dirt cannot enter the shell through the gap of the semicircular groove, thereby avoiding dust and dirt from entering and affecting the overall operation of the equipment, and further improving the overall sealing and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0028] Figure 2 It is a partial cross-sectional view of the present invention;

[0029] Figure 3 is a side cross-sectional view of the present invention;

[0030] Figure 4 is a top cross-sectional view of the present invention;

[0031] Figure 5 It is a front cross-sectional view of the present invention;

[0032] Figure 6 For the present invention Figure 2 Enlarged view of point A in the middle;

[0033] Figure 7 For the present invention Figure 3 Enlarged view of point B in the middle;

[0034] Figure 8 For the present invention Figure 4 Enlarged view of point C in the middle;

[0035] Fig. 9 For the present invention Figure 7 Enlarged view of point D in the middle.

[0036] In the figure: 1. photoelectric switch body; 2. housing; 3. motor; 4. lens; 5. spring one; 6. fixing plate one; 7. brush plate; 8. spring two; 9. fixing plate two; 10. connecting rod; 11. roller; 12. water storage box; 13. water pipe; 14. fine hole; 15. solenoid valve; 16. slide; 17. telescopic rod; 18. spring three; 19. extrusion head; 20. bayonet; 21. rubber pad one; 22. rubber pad two; 23. sleeve. DETAILED DESCRIPTION

[0037] 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.

[0038] See also Figures 1 to 9 The present invention provides a photoelectric travel limit switch, and the technical solution is as follows:

[0039] A photoelectric travel limit switch includes a photoelectric switch body 1 and a cleaning device matched with the photoelectric switch body 1, wherein the cleaning device includes:

[0040] Shell 2, the emitting surface of the photoelectric switch body 1 is fixedly mounted with the shell 2, and a semicircular groove is provided on the side of the shell 2 away from the photoelectric switch body 1;

[0041] Motor 3, the middle of the housing 2 is fixedly connected with the motor 3;

[0042] Lens 4: A lens 4 is fixedly mounted on the output shaft of the motor 3, and the lens 4 is circular;

[0043] Also includes:

[0044] A cleaning device is fixedly installed on the inner wall of the housing 2 on the side away from the photoelectric switch body 1.

[0045] When in use, first, the staff opens the photoelectric switch body 1, and the light beam emitted from the emission surface of the photoelectric switch body 1 passes through the lens 4 and the semicircular groove to work normally with the external equipment. When the part of the lens 4 facing the semicircular groove becomes dirty, affecting the normal operation of the photoelectric travel limit switch, the motor 3 is operated to start, and the lens 4 at the semicircular groove is the working surface. The motor 3 rotates to drive the lens 4 to turn the dirty working surface into the shell 2, and turn the clean side out to the semicircular groove as a new working surface, which does not affect the normal operation of the photoelectric switch body 1. When the dirty working surface of the lens 4 is turned into the shell 2, the cleaning device starts to work to clean the dust, dust and other substances attached to the lens 4;

[0046] The photoelectric switch body 1 should be used as little as possible in a working environment with a lot of dust, because the use of the photoelectric switch body 1 will be affected in a working environment with a lot of dust. However, by providing a cleaning device, the photoelectric switch body 1 can work stably in a working environment with a lot of dust, thereby improving the stability of the photoelectric switch body 1.

[0047] As an embodiment of the present invention, the cleaning device includes a fixing plate 6 fixedly mounted on the inner wall of the housing 2 away from the photoelectric switch body 1 by multiple springs 5, and a brush plate 7 is fixedly mounted on one end of the fixing plate 6 close to the lens 4.

[0048] Due to their own elastic force, the multiple springs 5 ​​make the brush plate 7 press against the lens 4, so that the bristles on the brush plate 7 are in contact with the lens 4. When the motor 3 drives the lens 4 to rotate, the motor 3 drives the dirty working surface of the lens 4 to enter the housing 2. When rotating, the bristles on the brush plate 7 brush off the dust and dirt adhered to the lens 4, preparing for the next switching of the working surface. By arranging the spring 5 and the fixed plate 6 and the brush plate 7, the bristles on the brush plate 7 are always in contact with the lens 4. When the motor 3 drives the lens 4 to rotate, the bristles on the brush plate 7 can stably brush off the dust and dirt on the lens 4, thereby improving the overall stability.

[0049] As an embodiment of the present invention, a plurality of springs 5 ​​are horizontally and fixedly installed on the inner wall of the housing 2 on the side away from the photoelectric switch body 1 .

[0050] The plurality of springs 1-5 are all rectangular springs. The lateral force applied to the springs 1-5 by the lens 4 when rotating is not enough to deform the rectangular springs. In addition, the lens 4 is not rotating all the time, and does not apply lateral force to the springs 1-5 all the time.

[0051] A plurality of springs 5 ​​are horizontally fixedly installed on the inner wall of the shell 2, so that the fixing plate 6 and the brush plate 7 are in a horizontal state. When the motor 3 drives the lens 4 to rotate, the bristles on the brush plate 7 brush off the dust and dirt on the lens 4. Most of the dust and dirt falls into the shell 2. Some dust and dirt will adhere to the bristles on the brush plate 7. Excessive accumulation will affect the effect of subsequent cleaning of the lens 4. By arranging the brush plate 7 to be placed horizontally, when too much dust and dirt accumulates on the brush plate 7, it will fall due to its own gravity. The brush plate 7 is placed horizontally to avoid excessive accumulation of dust and dirt that cannot fall off, thereby affecting the subsequent cleaning effect, thereby improving the stability of the brushing by the brush plate 7.

[0052] As an embodiment of the present invention, a fixing plate 29 is fixedly installed on the upper end of the inner side wall of the shell 2 through a spring 28, and connecting rods 10 are fixedly connected at both ends of the fixing plate 29, and a roller 11 is rotatably connected between the two connecting rods 10, and a layer of magic sponge is wrapped around the roller 11, and a right angle of ninety degrees is formed between the fixing plate 29 and the fixing plate 16. A water storage box 12 is provided on the inner wall of the top of the shell 2, and a water pipe 13 is provided inside the roller 11, and a sleeve 23 is fixedly installed in the connecting rod 10 near one end of the water storage box 12, and a hose is connected to the outside of the water storage box 12, and the hose passes through the connecting rod 10 and is fixedly connected to the sleeve 23, and the other end of the sleeve 23 is rotatably connected to the water pipe 13, and a solenoid valve 15 is provided on the hose, and the solenoid valve 15 is electrically connected to the motor 3, and a plurality of fine holes 14 are provided together with the water pipe 13 and the roller 11.

[0053] The plurality of springs 2 8 are all rectangular springs. The lateral force applied to the springs 2 8 when the lens 4 rotates is insufficient to deform the rectangular springs. In addition, the lens 4 is not rotating all the time, and does not apply lateral force to the springs 2 8 all the time.

[0054] A damping bearing is installed at the rotation connection between the roller 11 and the connecting rod 10. When rotating, it encounters resistance, so that the rotation of the roller 11 and the movement of the contact surface of the lens 4 are not synchronized, and relative sliding occurs between the two. This prevents the roller 11 from rotating under the action of friction, which may cause synchronous movement between the contacting surface of the lens 4 without relative sliding, making it difficult to effectively clean the dust and dirt on the surface of the lens 4.

[0055] The plurality of springs 28 make the roller 11 press against the lens 4 due to their own elastic force. As the lens 4 rotates counterclockwise, when the motor 3 is started, the motor 3 gives an electrical signal to the solenoid valve 15. The solenoid valve 15 opens for one second and then closes. The aqueous solution in the water storage box 12 flows into the water pipe 13 in the roller 11 through the hose, and then flows out through the plurality of fine holes 14 to the magic sponge, soaking the magic sponge. When the motor 3 drives the lens 4 to rotate, the friction between the roller 11 and the lens 4 causes the roller 11 to rotate, driving the magic sponge to rotate and preliminarily clean the dust and dirt adhered to the lens 4. Moreover, because the aqueous solution soaks the magic sponge, the lens 4 is then soaked, so that the brush plate 7 can better clean the dust and dirt on the lens 4 when cleaning the lens 4, further improving the stability of the photoelectric switch body 1.

[0056] As an embodiment of the present invention, the aqueous solution in the water storage box 12 is glass water.

[0057] The glass water is mainly composed of water, alcohol, ethylene glycol, corrosion inhibitor and various surfactants. The aqueous solution inside the water storage box 12 is set as glass water. After soaking the magic sponge, the rotating roller 11 drives the magic sponge to clean the lens 4 and soak the lens 4. Compared with ordinary water, the glass water can achieve better effect when cleaning the surface, so that the brush plate 7 can better clean the dust and dirt adhered to the surface of the lens 4 when cleaning the lens 4, further improving the stability.

[0058] As an embodiment of the present invention, the housing 2 is provided with two slideways 16 symmetrically arranged on the inner wall of the photoelectric switch body 1 near the photoelectric switch body 1 . The photoelectric switch body 1 is provided with a convenient fixing device for fixing to the housing 2 , and the convenient fixing device cooperates with the slideways 16 .

[0059] During the installation process, align the convenient fixing device with the two slides 16, press the photoelectric switch body 1 downward, and the photoelectric switch body 1 slides in the slide 16. Then the convenient fixing device fixes the photoelectric switch body 1 and the shell 2. When the shell 2 needs to be removed, it can be removed quickly and conveniently through the convenient fixing device. By setting the slide 16, it is more convenient for the convenient fixing device to fix the photoelectric switch body 1 and the shell 2. After the photoelectric switch body 1 is separated from the shell 2, the dust and dirt in the slide 16 can be easily cleaned, thereby improving the convenience of installation.

[0060] As an embodiment of the present invention, the convenient fixing device includes two telescopic rods 17 fixedly installed on both sides of the photoelectric switch body 1, and the two telescopic rods 17 are connected to an extrusion head 19 through a spring three 18. The two extrusion heads 19 cooperate with the slide 16. A bayonet 20 that cooperates with the two telescopic rods 17 is provided on the inner wall of the outer shell 2, and the two bayonet 20 are both located on the slide 16.

[0061] During the installation process, align the two telescopic rods 17 with the two slides 16 respectively, press the photoelectric switch body 1 downward, and the two extrusion heads 19 slide in the slides 16. The spring three 18 shrinks due to the extrusion force of the extrusion head 19. When the extrusion head 19 slides to the bayonet 20, the spring three 18 pops out and bounces the extrusion head 19 into the bayonet 20 for engagement. At this time, the photoelectric switch body 1 and the housing 2 are in a fixed state. When the photoelectric switch body 1 is to be separated from the housing 2, just grab the photoelectric switch body 1 and pull it upward with force. The extrusion head 19 is squeezed by the edge of the bayonet 20 to squeeze and shrink the spring three 18, and then the extrusion head 19 slides in the slide 16, and the photoelectric switch body 1 is separated from the housing 2. By arranging the spring three 18, the extrusion head 19 and the bayonet 20, the photoelectric switch body 1 can be conveniently fixed to and separated from the housing 2, thereby improving the convenience of installation.

[0062] As an implementation mode of the present invention, rubber pads 21 are disposed between both sides of the photoelectric switch body 1 and the housing 2 , and the rubber pads 21 cooperate with the slideway 16 .

[0063] During the overall operation, the entire device may vibrate and shake due to the influence of the operation of the external machine, thereby affecting the stability of the operation of the motor 3. By providing a rubber pad 21 between both sides of the photoelectric switch body 1 and the outer shell 2, the vibration and shaking caused by the operation of the external machine are reduced, thereby improving the stability of the motor 3 during operation and improving the sealing to a certain extent.

[0064] As an embodiment of the present invention, a rubber pad 22 is fixedly installed on the inner wall of the housing 2 where the semicircular groove is provided, and the rubber pad 22 cooperates with the semicircular groove.

[0065] By setting a rubber pad 22 that cooperates with the semicircular groove and is fixedly installed on the inner wall of the shell 2 where the semicircular groove is opened, external dust and dirt cannot enter the shell 2 through the gap of the semicircular groove, avoiding dust and dirt from entering and affecting the overall operation of the equipment, thereby further improving the overall sealing and stability.

[0066] As an embodiment of the present invention, the lens 4 is made of highly transparent acrylic material.

[0067] When in use, the lens 4 needs to rub against the brush plate 7 for a long time. The acrylic material has good wear resistance and is not easy to break. Compared with other materials, it has a longer service life in harsh environments.

[0068] Working principle: Before use, the staff aligns the two telescopic rods 17 with the two slides 16 respectively, presses down the photoelectric switch body 1, and the two extrusion heads 19 slide in the slides 16. The spring three 18 contracts under the extrusion force of the extrusion head 19. When the extrusion head 19 slides to the bayonet 20, the spring three 18 pops out and snaps the extrusion head 19 into the bayonet 20. At this time, the photoelectric switch body 1 and the housing 2 are in a fixed state. Open the photoelectric switch body 1. When the lens 4 is facing the semicircular groove and becomes dirty, affecting the normal operation of the photoelectric travel limit switch, operate the motor 3 to start. The motor 3 rotates to drive the lens 4 to turn the dirty working surface into the inside of the housing 2 and turn the clean side out to the semicircular groove. When the lens 4 rotates counterclockwise, the motor 3 starts and gives an electrical signal to the solenoid valve 15. The solenoid valve 15 opens for one second and then closes. The glass water in the water storage box 12 flows into the water pipe 13 in the roller 11 through the hose, and then flows out to the magic sponge through a plurality of pores 14 to wet the magic sponge. When the motor 3 drives the lens 4 to rotate, the friction between the roller 11 and the lens 4 causes the roller 11 to rotate, driving the magic sponge to rotate and preliminarily clean the dust and dirt adhered to the lens 4. Moreover, because the water solution wets the magic sponge, the lens 4 is then wetted, and then the brush plate 7 cleans off the dust and dirt remaining on the lens 4 after the preliminary cleaning of the roller 11 and the magic sponge.

[0069] The electrical components appearing in this article are all connected to the external main controller and 220V AC power through a transformer, and the main controller can be a conventional known device that controls a computer, etc. The product model provided by the present invention is only used for the technical solution according to the structural characteristics of the product. The product will be adjusted and modified after purchase to make it more matching and consistent with the technical solution of the present invention. It is a technical solution for the best application of the technical solution. The model of its product can be replaced and modified according to the required technical parameters, which is well known to technical personnel in this field. Therefore, technical personnel in this field can clearly obtain the corresponding use effect through the technical solution provided by the present invention.

[0070] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A photoelectric travel limit switch, comprising a photoelectric switch body (1) and a cleaning device matched with the photoelectric switch body (1), wherein the cleaning device comprises: A housing (2), the housing (2) being fixedly mounted on the emission surface of the photoelectric switch body (1), and a semicircular groove being provided on the side of the housing (2) away from the photoelectric switch body (1); a motor (3), the motor (3) being fixedly connected to the middle of the housing (2); a lens (4), the lens (4) being fixedly mounted on the output shaft of the motor (3), and the lens (4) being circular; the device is characterized in that it further comprises: a cleaning device, the cleaning device being fixedly mounted on the inner wall of the housing (2) away from the photoelectric switch body (1); The cleaning device comprises a fixing plate (6) fixedly mounted on the inner wall of the housing (2) on a side away from the photoelectric switch body (1) by means of a plurality of springs (5); a brush plate (7) is fixedly mounted on one end of the fixing plate (6) close to the lens (4); A plurality of springs (5) are fixedly mounted horizontally on an inner wall of the housing (2) away from the photoelectric switch body (1); A second fixing plate (9) is fixedly mounted on the upper end of the inner side wall of the shell (2) via a second spring (8), and both ends of the second fixing plate (9) are fixedly connected to connecting rods (10), and a rotating roller (11) is connected between the two connecting rods (10) for common rotation, and the outer surface of the rotating roller (11) is wrapped with a layer of magic sponge, and the second fixing plate (9) and the first fixing plate (6) form a right angle of 90 degrees, and a water storage box (12) is provided on the inner wall of the top of the shell (2), and a water pipe is provided inside the rotating roller (11). (13), and a sleeve (23) is fixedly installed in the connecting rod (10) near one end of the water storage box (12), and the water storage box (12) is externally connected with a hose, and the hose passes through the connecting rod (10) and is fixedly connected to the sleeve (23), and the other end of the sleeve (23) is rotatably connected to the water pipe (13), and the hose is provided with a solenoid valve (15), and the solenoid valve (15) is electrically connected to the motor (3), and the water pipe (13) and the rotating roller (11) are jointly provided with a plurality of fine holes (14); The aqueous solution inside the water storage box (12) is glass water.

2. The photoelectric travel limit switch according to claim 1, characterized in that: The housing (2) is provided with two slideways (16) symmetrically arranged on the inner wall of the photoelectric switch body (1) close to the photoelectric switch body (1); the photoelectric switch body (1) is provided with a convenient fixing device for fixing to the housing (2), and the convenient fixing device cooperates with the slideways (16).

3. A photoelectric travel limit switch according to claim 2, characterized in that: The convenient fixing device comprises two telescopic rods (17) fixedly mounted on both sides of the photoelectric switch body (1), the two telescopic rods (17) are connected to an extrusion head (19) via a spring three (18), the two extrusion heads (19) cooperate with the slideway (16), and a bayonet (20) cooperating with the two telescopic rods (17) is provided on the inner wall of the housing (2), and the two bayonet (20) are both located on the slideway (16).

4. The photoelectric travel limit switch according to claim 2, characterized in that: A rubber pad (21) is provided between both sides of the photoelectric switch body (1) and the housing (2), and the rubber pad (21) cooperates with the slideway (16).

5. The photoelectric travel limit switch according to claim 1, characterized in that: A second rubber pad (22) is fixedly mounted on the inner wall of the housing (2) where the semicircular groove is provided and matches the semicircular groove.

6. The photoelectric travel limit switch according to claim 1, characterized in that: The lens (4) is made of highly transparent acrylic material.

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