An electro-flocculation coupled microfiltration domestic sewage treatment device and treatment process

Abstract

The present invention relates to the field of domestic sewage treatment, and in particular to an electro-flocculation coupled microfiltration domestic sewage treatment device, comprising a box body, wherein a liquid inlet and a liquid outlet are respectively arranged on both sides of the box body, and a row of positive plates are fixedly arranged in a rectangular array in the box body, and a negative plate is arranged between two adjacent positive plates, and the top height of the positive plate is higher than that of the negative plate, and a cleaning mechanism is also arranged between the adjacent positive plates and negative plates, and the cleaning mechanism is symmetrically arranged with respect to the positive plate; the cleaning mechanism comprises a circular tube. The cleaning mechanism adopted by the device can complete the cleaning of the electrode plate without taking out the electrode plate, and can not only clean the attachments and oxides on the surface of the electrode plate, but also can orderly switch the work of different scrapers, so that the scraper wear caused by cleaning the surface of the electrode plate is evenly distributed by multiple scrapers, thereby achieving the purpose of extending the working cycle of the cleaning mechanism and ensuring the cleaning effect of the cleaning mechanism.

Description

Technical Field

[0001] The invention relates to the field of domestic sewage treatment, in particular to an electric flocculation coupled microfiltration domestic sewage treatment device and a treatment process. Background Art

[0002] Electroflocculation is a technology that uses electrolytic reactions to produce floccules from pollutants in sewage as they are ionized. Usually, the positive and negative electrode plates of electroflocculation need to be cleaned regularly, otherwise the impurities attached to the positive and negative electrode plates and the oxides of the electrode plates themselves will seriously slow down the working efficiency of electroflocculation and increase the power consumption of the equipment. Therefore, in order to solve the above problems, we proposed an electroflocculation coupled microfiltration domestic sewage treatment device and treatment process. Summary of the invention

[0003] In view of the problem that the sewage treatment efficiency of the electrocoagulation equipment described above or in the prior art is reduced due to the attachment of impurities to the electrode plates and the generation of an oxide layer, the present invention is proposed.

[0004] Therefore, the object of the present invention is to provide an electro-flocculation coupled microfiltration domestic sewage treatment device and a treatment process.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an electro-flocculation coupled microfiltration domestic sewage treatment device, comprising a box body, wherein a liquid inlet and a liquid outlet are respectively arranged on both sides of the box body, and a row of positive plates are fixedly arranged in a rectangular array in the box body, and a negative plate is arranged between two adjacent positive plates, and the top height of the positive plate is higher than that of the negative plate, and a cleaning mechanism is also arranged between the adjacent positive plates and negative plates, and the cleaning mechanism is symmetrically arranged with respect to the positive plate; the cleaning mechanism comprises a circular tube, and the side wall of the circular tube is inlaid parallel to the axial direction thereof. There are scraping strips, which are distributed in a circular array about the circular tube, and the positive plate and the negative plate are both provided with two scraping strips in sliding contact with the contact side of the cleaning mechanism, and the inner walls at both ends of the circular tube are provided with tooth grooves; in a single circular tube, both ends of the circular tube are rotatably connected with short shafts, and the peripheral wall of the short shaft is located at the tooth groove and is plugged with a spring piece 1, and the end of the spring piece 1 away from the short shaft is in contact with the tooth groove, the ends of the short shafts away from each other are rotatably connected with a bracket 1, and the end of the short shaft passing through the bracket 1 is fixedly connected with a shift block; a spring piece 2 is connected between adjacent shift blocks located on both sides of the positive plate.

[0006] As a preferred solution of the electro-flocculation coupled microfiltration domestic sewage treatment device of the present invention, the liquid inlet is arranged at the bottom of the box, and the liquid outlet is arranged at the top of the box, the ends of the liquid inlet and the liquid outlet away from the box are both circular, and the ends of the liquid inlet and the liquid outlet connected to the box are both flat.

[0007] As a preferred solution of the electro-flocculation coupled microfiltration domestic sewage treatment device of the present invention, the end face of the scraper bar is rectangular, the four long edges of the scraper bar are at different distances from the axis of the circular tube, and the positive plate and the negative plate are both slidably connected with the edge of the scraper bar in the cleaning mechanism at the largest distance from the circular tube.

[0008] As a preferred solution of the electro-flocculation coupled microfiltration domestic sewage treatment device of the present invention, the scraper bar and the circular tube are fastened with screws, and the fastening screws are distributed at equal intervals along the scraper bar.

[0009] As a preferred solution of the electro-flocculation coupled microfiltration domestic sewage treatment device of the present invention, the first spring piece is arranged in an arc shape, the second spring piece is in a straight strip shape, and the two shifting blocks connected to the second spring piece are arranged in an oblique downward direction.

[0010] As a preferred solution of the electro-flocculation coupled microfiltration domestic sewage treatment device of the present invention, wherein: the bracket one is arranged in a U shape, the bottom of the bracket one is horizontal, and a pair of the brackets are symmetrically distributed on both sides of the box body, the top of the bracket one vertically penetrates the box body, and the tops of the brackets one are connected to the bracket two in an X shape.

[0011] As a preferred solution of the electro-flocculation coupled microfiltration domestic sewage treatment device of the present invention, wherein: the X-intersection position of the second bracket is vertically fixedly connected to a cylinder upward, and the piston rod of the cylinder is vertically fixedly connected to the top of the box body downward.

[0012] As a preferred solution of the electro-flocculation coupled microfiltration domestic sewage treatment device of the present invention, the positive electrode plate and the negative electrode plate are perpendicular to the inner wall of the box body on the liquid inlet side.

[0013] As a preferred solution of the electro-flocculation coupled microfiltration domestic sewage treatment device of the present invention, wherein: ejector pins are arranged at positions corresponding to the shifting blocks on the inner bottom surface of the box body, and the ejector pins are arranged vertically.

[0014] An electro-flocculation coupled microfiltration domestic sewage treatment process, comprising:

[0015] Step 1: sewage enters the box from the low-level liquid inlet and flows between the positive electrode and the negative electrode;

[0016] Step 2: The positive electrode sheet and the negative electrode sheet are connected to the positive electrode and the negative electrode of the power supply respectively, and hydrogen and oxygen are decomposed while the sewage is electro-flocculated. The bubbles of hydrogen and oxygen are mixed with the treated sewage and the flocculants and discharged from the liquid outlet together;

[0017] Step 3: When cleaning the attachments, the piston rod of the cylinder retracts into the cylinder body, and the bracket 1 is inserted into the box body along with the movement of the cylinder body. The bracket 1 drives the cleaning mechanism to slide along the surface of the positive plate and the negative plate and scrapes off the attachments through the scraper. The piston rod of the cylinder reciprocates, so that the cleaning mechanism repeatedly cleans the positive plate and the negative plate.

[0018] Step 4: When the cleaning mechanism rises to the upper dead point of the stroke, the scraper bar in contact with the positive plate moves to the top of the positive plate, and the spring releases its elastic potential energy to push the circular tube to deflect slightly, so that the edge of the scraper bar that originally slid in contact with the positive plate moves to the top surface of the positive plate. When the cleaning mechanism descends again, the edge of the scraper bar will overlap the top of the positive plate and drive the circular tube to rotate, so that the scraper bar at other parts of the circular tube is deflected to contact with the positive plate;

[0019] Step 5: When the cleaning mechanism moves to the lowest point, the ejector pin will push the shift block upward, causing the shift block to deflect and drive the spring piece to reset and store elastic potential energy to prepare for the next switch of the scraper position.

[0020] The beneficial effects of the electro-flocculation coupled microfiltration domestic sewage treatment device of the present invention are as follows: the cleaning mechanism adopted in the device can complete the electrode plate cleaning work without removing the electrode plate. It can not only clean the attachments and oxides on the surface of the electrode plate, but also can switch different scraper bars in an orderly manner. This makes the scraper bar wear caused by cleaning the surface of the electrode plate evenly distributed by multiple scraper bars, thereby achieving the purpose of extending the working cycle of the cleaning mechanism and ensuring the cleaning effect of the cleaning mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the overall structure of the electro-flocculation coupled microfiltration domestic sewage treatment device.

[0023] Figure 2 This is a structural cross-sectional view of the electro-flocculation coupled microfiltration domestic sewage treatment device.

[0024] Figure 3 This is a schematic diagram of the assembly structure between the cleaning mechanism and the electrode plate of the electro-flocculation coupled microfiltration domestic sewage treatment device.

[0025] Figure 4 This is a structural cross-sectional view of the box of the electro-flocculation coupled microfiltration domestic sewage treatment device.

[0026] Figure 5for Figure 3 Schematic diagram of the local structure.

[0027] Figure 6 for Figure 5 A is an enlarged view of the structure.

[0028] Figure 7 for Figure 6 Formal diagram of the local structure.

[0029] Figure 8 It is a structural schematic diagram of the relative position of the positive plate of the cleaning mechanism of the electro-flocculation coupled microfiltration domestic sewage treatment device after the cleaning mechanism moves to the upper dead point of the stroke.

[0030] In the figure: 100, housing; 101, positive electrode plate; 102, negative electrode plate; 100a, liquid inlet; 100b, liquid outlet; 200, cleaning mechanism; 201, round tube; 202, scraper; 203, short shaft; 204, spring piece 1; 205, bracket 1; 206, shifting block; 207, spring piece 2; 208, bracket 2; 209, ejector pin; 210, cylinder; 201a, tooth groove. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] Example, see Figure 1 to Figure 8 , which is the first embodiment of the present invention, provides an electro-flocculation coupled microfiltration domestic sewage treatment device and treatment process, which can achieve a long-term and effective cleaning effect on the surface of the electro-flocculation electrode plate, such as Figure 1 As shown, it includes a box body 100, and a liquid inlet 100a and a liquid outlet 100b are respectively provided on both sides of the box body 100. Figure 2 As shown, a row of positive plates 101 are fixedly arranged in a rectangular array in the box 100, and a negative plate 102 is arranged between two adjacent positive plates 101, and the top height of the positive plate 101 is higher than that of the negative plate 102. A cleaning mechanism 200 is also arranged between the adjacent positive plates 101 and the negative plates 102, and the cleaning mechanism 200 is symmetrically arranged with respect to the positive plate 101; Figure 6As shown, the cleaning mechanism 200 includes a circular tube 201, and the side wall of the circular tube 201 is inlaid with a scraper 202 parallel to its axial direction, and the scraper 202 is distributed in a ring array with respect to the circular tube 201, and the positive plate 101 and the negative plate 102 are both provided with two scraper strips 202 on the contact side of the cleaning mechanism 200 in sliding contact, and the inner walls of both ends of the circular tube 201 are provided with tooth grooves 201a; in a single circular tube 201, both ends of the circular tube 201 are rotatably connected with a short shaft 203, and the peripheral wall of the short shaft 203 is located at the tooth groove 201a and is plugged with a spring piece 1 204, and the end of the spring piece 1 204 away from the short shaft 203 is in contact with the tooth groove 201a, and the ends of the short shaft 203 away from each other are rotatably connected with a bracket 1 205, and the end of the short shaft 203 that passes through the bracket 1 205 is fixedly connected with a shift block 206; as shown Figure 6 and Figure 7 As shown, a second spring piece 207 is connected between adjacent shifting blocks 206 located on both sides of the positive electrode plate 101 .

[0033] Specifically, Figure 1 and Figure 2 As shown, the liquid inlet 100a is arranged at the bottom of the box body 100, and the liquid outlet 100b is arranged at the top of the box body 100. The ends of the liquid inlet 100a and the liquid outlet 100b away from the box body 100 are both circular, and the ends of the liquid inlet 100a and the liquid outlet 100b connected to the box body 100 are both flat, as shown in FIG. Figure 7 As shown, the end face of the scraper 202 is rectangular, and the four long edges of the scraper 202 are at different distances from the axis of the circular tube 201, and the positive plate 101 and the negative plate 102 are both slidably connected to the edge of the cleaning mechanism 200 where the scraper 202 is at the largest distance from the circular tube 201, as shown in FIG. Figure 6 As shown, the scraper strip 202 and the round tube 201 are fastened with screws, and the fastening screws are evenly spaced along the scraper strip 202. The spring piece 1 204 is arranged in an arc shape, the spring piece 207 is in a straight strip shape, and the two shifting blocks 206 connected to the spring piece 207 are both arranged in an oblique downward direction.

[0034] like Figure 2 As shown, the X-crossing position of the bracket 208 is vertically upwardly fixedly connected to the cylinder 210, and the piston rod of the cylinder 210 is vertically downwardly fixedly connected to the top of the box body 100, and the positive plate 101 and the negative plate 102 are perpendicular to the inner wall of the box body 100 located on the side of the liquid inlet 100a. Figure 3 As shown, the bracket 1 205 is arranged in a U shape, the bottom of the bracket 1 205 is horizontal, and a pair of brackets 205 are symmetrically distributed on both sides of the box body 100, the top of the bracket 1 205 vertically penetrates the box body 100, and the tops of the brackets 1 205 are connected to the bracket 2 208 in an X shape, as shown in FIG. Figure 4As shown, ejector pins 209 are disposed at positions of the inner bottom surface of the box body 100 corresponding to the shifting block 206 , and the ejector pins 209 are vertically disposed.

[0035] The present invention mainly provides a compact cleaning mechanism 200 arranged between electrode plates. The cleaning mechanism 200 can be equipped with a plurality of scraping strips 202 at a time. The cleaning mechanism 200 reciprocates up and down so that the scraping strips 202 scrape off attachments on the surface of the electrode plate. Each time the cleaning mechanism 200 performs a lifting action, the circular tube 201 of the cleaning mechanism 200 will deflect by a certain angle and switch different scraping strips 202 to work in sequence. This makes the wear on the surface of the cleaning electrode plate evenly distributed by multiple scraping strips 202, thereby achieving the purpose of extending the working cycle of the cleaning mechanism 200 and ensuring the cleaning effect of the cleaning mechanism 200.

[0036] To achieve the above purpose, the device also involves the following technical details:

[0037] First, when cleaning the attachments, the piston rod of the cylinder 210 is retracted into the cylinder body, and the bracket 205 is inserted into the box body 100 along with the movement of the cylinder body of the cylinder 210. The bracket 205 drives the cleaning mechanism 200 to slide along the surface of the positive plate 101 and the negative plate 102 and scrape off the attachments through the scraper 202. The piston rod of the cylinder 210 reciprocates, so that the cleaning mechanism 200 repeatedly cleans the positive plate 101 and the negative plate 102. Figure 7 Taking the perspective as an example, the scraper 202 on the left side of the positive plate 101 is arranged clockwise, and the scraper 202 on the right side of the positive plate 101 is arranged counterclockwise. When the circular tube 201 moves upward, the edge of the scraper 202 reversely scrapes the surface of the negative plate 102, and the scraper 202 is relatively smooth relative to the surface of the positive plate 101. Conversely, when the circular tube 201 moves downward, the scraper 202 will reversely scrape the surface of the positive plate 101, and the scraper 202 is relatively smooth relative to the surface of the negative plate 102. Since there are a total of four scraper bars 202 in contact between the adjacent positive plates 101 and negative plates 102, the circular tube 201 and the scraper bar 202 will not rotate between the electrode plates to cause failure. The circular tube 201 moves up and down once with the bracket 1 205 and the bracket 2 208, and the surface of the positive plate 101 and the negative plate 102 are cleaned once;

[0038] Secondly, when the cleaning mechanism 200 rises to the upper dead point of the stroke, the scraper 202 in contact with the positive plate 101 moves to the top of the positive plate 101, and the spring piece 1 204 releases the elastic potential energy to push the circular tube 201 to deflect slightly, so that the edge of the scraper 202 that originally slidably contacts the positive plate 101 moves to the top surface of the positive plate 101. When the cleaning mechanism 200 descends again, the edge of the scraper 202 overlaps the top of the positive plate 101 and drives the circular tube 201 to rotate, so that the scraper 202 at other parts of the circular tube 201 deflects to contact with the positive plate 101, so as to prevent the scraper 202 from being scratched. Figure 8Taking the perspective as an example, when the circular tube 201 rises to the top dead center, the scraper 202 is no longer restricted by the positive plate 101, so that the spring piece 204 stretches to push the circular tube 201 to deflect a certain angle, so that the edge of the scraper 202 moves from the position marked as a to the position marked as b. When the cleaning mechanism 200 descends again, the edge of the scraper 202 will overlap with the top of the positive plate 101, so that the circular tube 201 is deflected by a certain angle again, so that the adjacent scraper 202 at the bottom of the scraper 202 contacts the positive plate 101, and the scraper 202 is switched;

[0039] by Figure 7 Taking the perspective as an example, during the process, the spring piece 1 204 is always restrained by the shift block 206 and the spring piece 207. The spring piece 207 pulls the two connected shift blocks 206 in a straight strip shape, preventing them from deflecting downward. When the cleaning mechanism 200 moves to the lowest point, the ejector pin 209 will push the shift block 206 upward, causing the shift block 206 to deflect and drive the spring piece 1 204 to reset and store elastic potential energy to prepare for the next switching of the scraper strip 202 position. During the process, the spring piece 207 will bend due to the squeezing force to store elastic potential energy, so as to facilitate the subsequent driving of the shift block 206 to reset.

[0040] In summary, the cleaning mechanism 200 adopted in the device can complete the electrode plate cleaning work without removing the electrode plate. It can not only clean the attachments and oxides on the surface of the electrode plate, but also can switch different scraping strips 202 to work in an orderly manner. This makes the wear of the scraping strip 202 caused by cleaning the surface of the electrode plate evenly distributed by multiple scraping strips 202, thereby achieving the purpose of extending the working cycle of the cleaning mechanism 200 and ensuring the cleaning effect of the cleaning mechanism 200.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An electro-flocculation coupled microfiltration domestic sewage treatment device, characterized in that: The invention comprises a box body (100), wherein two sides of the box body (100) are respectively provided with a liquid inlet (100a) and a liquid outlet (100b), and a row of positive plates (101) are fixedly arranged in a rectangular array in the box body (100), and a negative plate (102) is arranged between two adjacent positive plates (101), and the top of the positive plate (101) is higher than that of the negative plate (102), and a cleaning mechanism (200) is also arranged between the adjacent positive plates (101) and negative plates (102), and the cleaning mechanism (200) is symmetrically arranged with respect to the positive plate (101); The cleaning mechanism (200) comprises a circular tube (201), and a scraper strip (202) is embedded on the side wall of the circular tube (201) parallel to the axial direction thereof, the scraper strips (202) are distributed in a ring array with respect to the circular tube (201), and the positive electrode plate (101) and the negative electrode plate (102) are both provided with two scraper strips (202) on the contact side with the cleaning mechanism (200) in sliding contact, and tooth grooves (201a) are provided on the inner walls at both ends of the circular tube (201); In a single circular tube (201), both ends of the circular tube (201) are rotatably connected to a short shaft (203), a spring sheet (204) is inserted into a peripheral wall of the short shaft (203) at a tooth groove (201a), and one end of the spring sheet (204) away from the short shaft (203) abuts against the tooth groove (201a), both ends of the short shaft (203) away from each other are rotatably connected to a bracket (205), and the end of the short shaft (203) passing through the bracket (205) is fixedly connected to a shift block (206), and an ejector pin (209) is arranged at a position corresponding to the shift block (206) on the inner bottom surface of the box body (100), and the ejector pin (209) is arranged vertically; A second spring piece (207) is connected between adjacent shifting blocks (206) located on both sides of the positive electrode plate (101).

2. The electro-flocculation coupled microfiltration domestic sewage treatment device according to claim 1, characterized in that: The liquid inlet (100a) is arranged at the bottom of the box body (100), and the liquid outlet (100b) is arranged at the top of the box body (100); the ends of the liquid inlet (100a) and the liquid outlet (100b) away from the box body (100) are both circular, and the ends of the liquid inlet (100a) and the liquid outlet (100b) connected to the box body (100) are both flat.

3. The electro-flocculation coupled microfiltration domestic sewage treatment device according to claim 2, characterized in that: The end face of the scraper (202) is rectangular, the four long edges of the scraper (202) are at different distances from the axis of the circular tube (201), and the positive electrode plate (101) and the negative electrode plate (102) are both in sliding contact with an edge of the scraper (202) in the cleaning mechanism (200) at the greatest distance from the circular tube (201).

4. The electro-flocculation coupled microfiltration domestic sewage treatment device according to claim 3, characterized in that: The scraper strip (202) and the circular tube (201) are fastened with screws, and the fastening screws are distributed at equal intervals along the scraper strip (202).

5. The electro-flocculation coupled microfiltration domestic sewage treatment device according to claim 1, characterized in that: The spring piece 1 (204) is arranged in an arc shape, the spring piece 2 (207) is in a straight strip shape, and the two shifting blocks (206) connected to the spring piece 2 (207) are arranged in an oblique downward direction.

6. The electro-flocculation coupled microfiltration domestic sewage treatment device according to claim 5, characterized in that: The bracket one (205) is arranged in a U shape, the bottom of the bracket one (205) is horizontal, and a pair of the brackets one (205) are symmetrically distributed on both sides of the box body (100), the top of the bracket one (205) vertically penetrates the box body (100), and the tops of the brackets one (205) are connected to the bracket two (208) in an X shape.

7. The electro-flocculation coupled microfiltration domestic sewage treatment device according to claim 6, characterized in that: The X-intersection position of the second bracket (208) is vertically and upwardly fixedly connected to a cylinder (210), and the piston rod of the cylinder (210) is vertically and downwardly fixedly connected to the top of the box body (100).

8. The electro-flocculation coupled microfiltration domestic sewage treatment device according to claim 7, characterized in that: The positive electrode plate (101) and the negative electrode plate (102) are both perpendicular to the inner wall of the box body (100) located on the side of the liquid inlet (100a).

9. An electro-flocculation coupled microfiltration domestic sewage treatment process, characterized in that: The device comprises the electro-flocculation coupled microfiltration domestic sewage treatment device according to any one of claims 1 to 8, and the process steps, which include: Step 1: sewage enters the box (100) from the low-position liquid inlet (100a) and flows between the positive electrode sheet and the negative electrode sheet; Step 2: The positive electrode sheet and the negative electrode sheet are connected to the positive electrode and the negative electrode of the power supply respectively, and hydrogen and oxygen are decomposed while the sewage is electro-flocculated. The bubbles of hydrogen and oxygen are mixed with the treated sewage and flocculants and discharged from the liquid outlet (100b); Step 3: When cleaning the attachments, the piston rod of the cylinder (210) retracts into the cylinder body, and the bracket 1 (205) is inserted into the box body (100) as the cylinder body of the cylinder (210) moves. The bracket 1 (205) drives the cleaning mechanism (200) to slide along the surface of the positive electrode plate (101) and the negative electrode plate (102) and scrapes off the attachments through the scraper (202). The piston rod of the cylinder (210) reciprocates, so that the cleaning mechanism (200) repeatedly cleans the positive electrode plate (101) and the negative electrode plate (102); Step 4: when the cleaning mechanism (200) rises to the upper dead point of the stroke, the scraper (202) in contact with the positive electrode plate (101) moves to the top of the positive electrode plate (101), and the spring piece (204) releases elastic potential energy to push the circular tube (201) to deflect slightly, so that the edge of the scraper (202) that originally slidably contacts the positive electrode plate (101) moves to the top surface of the positive electrode plate (101), and when the cleaning mechanism (200) descends again, the edge of the scraper (202) overlaps the top of the positive electrode plate (101) and drives the circular tube (201) to rotate, so that the scraper (202) at other positions on the circular tube (201) deflects to contact with the positive electrode plate (101); Step 5, when the cleaning mechanism (200) moves to the lowest point, the ejector pin (209) pushes the shifting block (206) upward, causing the shifting block (206) to deflect and drive the spring piece 1 (204) to reset and store elastic potential energy to prepare for the next switching of the scraper strip (202) position.

Images