A cleaning device

Abstract

This application discloses a cleaning device, belonging to the field of cleaning equipment for agricultural and sideline product processing. The cleaning device includes a main frame, a controller connected to the main frame, and a cleaning assembly. The cleaning assembly includes a scraping assembly and a brush assembly connected to the main frame, which is supported and connected to a power assembly that drives the cleaning device; the brush assembly and the power assembly are driven and connected to the controller. This cleaning device can achieve good cleaning results and efficiency.

Description

Technical Field

[0001] This application belongs to the field of cleaning equipment for agricultural and sideline product processing, and relates to a cleaning device. Background Technology

[0002] In the forming stage of tofu skin production, after processes such as material selection, peeling, soaking soybeans, grinding, and separation of pulp and residue, the separated and heated slurry is generally transported to multiple film-forming tanks via conveying equipment. After a period of heat preservation, a thin film, also known as an oil skin, forms on the surface of the slurry. After peeling off the oil skin, it is tied into strips and then dried to form tofu skin. Among these processes, the film-forming tank is a key component in the tofu skin production process. When the soybean milk is placed in the film-forming tank, because the soybean milk needs to be heated to form a film, the soybean milk skin that forms on the surface of the soybean milk easily adheres to the side walls of the tank. As the soybean milk skin moves, it inevitably breaks and sticks to the inner wall of the film-forming tank. Furthermore, the bottom of the film-forming tank is prone to sticking and sludge buildup. Therefore, it is necessary to clean the inner wall of the film-forming tank promptly and efficiently after use.

[0003] The current method for cleaning conjunctival troughs is to use a scraper for manual cleaning. However, since the size of the conjunctival troughs is between 12m*(0.65-1)m, the cleaning workload is large, making manual cleaning time-consuming, labor-intensive, and inefficient. Furthermore, because serous scale adheres to the inner wall of the conjunctival trough, uneven force during manual cleaning can lead to incomplete cleaning or damage to the smoothness of the bottom of the conjunctival trough. When used again, the serous scale adhering to the bottom surface will be more difficult to clean, and the cleaning difficulty will increase with the number of cleaning cycles. Utility Model Content

[0004] The present application provides a cleaning device to overcome the problems of existing cleaning devices being unable to adapt to conjunctival tanks of different sizes, resulting in poor cleaning effect and low cleaning efficiency.

[0005] The solution presented in this application is implemented through the following steps.

[0006] The cleaning device for cleaning the membrane-forming tank of dried bean curd includes:

[0007] A main frame supported by a power unit that drives the cleaning device; and a controller and cleaning unit connected to the main frame.

[0008] The cleaning assembly includes a scraping assembly and a brush assembly that are detachably connected to the main frame;

[0009] The brush assembly and power assembly are driven to be connected to the controller, enabling the cleaning device to move forward or backward selectively, and to perform brushing operations during the movement.

[0010] Optionally, the scraping component and the brush component are located at opposite ends of the main frame.

[0011] Optionally, the scraping assembly includes: a scraper bracket and a scraper;

[0012] The main frame is connected to the scraper bracket via the movable end of a fixedly connected hinge joint. The scraper is slidably mounted on the scraper bracket and is configured to overlap within the conjunctival groove.

[0013] Optionally,

[0014] The scraper is made of stainless steel.

[0015] And / or, the scraper is attached to or the rope is tied to a counterweight.

[0016] Optionally, the scraper adhesive or rope has two counterweights, and the two counterweights are separated and located close to the spring.

[0017] Optionally, the brush assembly includes: a fixed slide plate, a brush, a brush holder, and a brush motor for driving the brush to rotate;

[0018] Two vertically arranged fixed sliding plates are fixed to the main frame;

[0019] The brush holder is slidably mounted on one side of the fixed slide plate, the brush is mounted on the inside of the brush holder, and the brush motor is connected to the brush drive via a brush timing belt.

[0020] Optionally, the fixed slide plate has vertically arranged positioning holes that communicate with the mounting holes on the brush holder. The fixed slide plate is slidably connected to the brush holder by bolts, and the bolts are fixedly screwed into the positioning holes through the mounting holes.

[0021] Optionally, the power assembly includes: a wheel-side bracket, a drive motor, a driven shaft, and two wheels;

[0022] The wheel-side bracket is fixedly connected to the bottom of the main frame;

[0023] A power motor fixed to the bottom of the wheel-side bracket;

[0024] One of the wheels is connected to the drive motor via a coupling, and the wheel is also connected to two driven shafts via two driven synchronous belts respectively;

[0025] The two driven shafts are also fixedly connected to another wheel.

[0026] Optionally, one end of one wheel is connected to a power motor, and the other end is fixedly connected to the inner ring of a bearing;

[0027] The bearings are fixedly mounted on the wheel-side bracket, which also houses two pairs of bearings; the two driven shafts are arranged in parallel and installed between the two pairs of bearings.

[0028] Optionally, two springs that are far apart from each other are fixedly connected to each other at the two ends of the scraper, and the two springs are also fixed to two spring brackets respectively. The two spring brackets are fixed to the side of the main frame.

[0029] The above-implemented solutions, in whole or in part, have at least the following effects:

[0030] 1. As the scraper moves forward with the cleaning device, it scrapes the soybean milk in the film-forming tank forward. The scraper pushes the soybean milk forward until it reaches the discharge hole at the front of the film-forming tank and is discharged through the discharge hole, thus completing the scraping of soybean milk with the scraper.

[0031] 2. The rotating brush can clean the soybean milk residue remaining in the film-forming tank after it has been scraped off by the scraper, thus achieving a secondary cleaning of the soybean milk. The cooperation between the horizontally moving scraper and the rotating brush greatly increases the cleaning and removal effect of the soybean milk and the work efficiency.

[0032] In summary, the cleaning device of this application can move freely (back and forth) in the conjunctival tank, enabling convenient and quick cleaning of soybean milk, thereby saving manpower, reducing the time spent on existing manual cleaning operations, improving cleaning efficiency, and thus facilitating its widespread use. Attached Figure Description

[0033] To illustrate this more clearly, the accompanying drawings used in the description will be briefly introduced below.

[0034] Figure 1 This is an isometric structural schematic diagram of the cleaning device proposed as an example in this application;

[0035] Figure 2 for Figure 1 A magnified schematic diagram of the structure of part A in the diagram;

[0036] Figure 3 This is a schematic diagram of the left side structure of the cleaning device proposed as an example in this application;

[0037] Figure 4 A schematic diagram of the isometric cross-sectional structure of the location of the brush and brush holder in the cleaning device proposed in the example of this application.

[0038] Figure 5 1. A schematic diagram of the isometric structure of the power component in the cleaning device proposed in this application.

[0039] Figure 6 A side view of the power component in the cleaning apparatus proposed in this application;

[0040] Figure 7A bottom view of the power component in the cleaning apparatus proposed in this application;

[0041] Figure 8 This is a top view of the power component in the cleaning apparatus proposed as an example of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Main framework;

[0044] 2. Scraper bracket; 3. PLC controller; 4. Power unit; 5. Brush; 6. Brush holder; 7. Battery; 8. Fixed slide plate; 9. Brush motor; 10. Brush timing belt; 11. Scraper; 12. Hinge joint; 13. Spring bracket; 14. Spring;

[0045] 4-1. Wheel-side bracket; 4-2. Driven shaft; 4-3. Driven synchronous belt; 4-4. Power motor; 4-5. Wheel; 4-6. Wheel. Detailed Implementation

[0046] A cleaning device for the soy milk tank of a tofu skin machine is disclosed in the prior art.

[0047] The cleaning device includes an electric drum.

[0048] The motorized drum includes a drum, a front shaft, and a rear shaft arranged coaxially. Support rollers are coaxially mounted on both the front and rear shafts of the motorized drum. A pair of clamping plates for holding the items to be cleaned are fixedly mounted on the drum of the motorized drum, and the length direction of the clamping plates is parallel to the central axis of the drum.

[0049] When using this cleaning device, an electric roller drives a cleaning component fixed by clamps to move within the conjunctival tank, thus cleaning the conjunctival tank. However, the specifications of the cleaning component in this solution are fixed, and the positions of the support rollers on both sides are also fixed, therefore it cannot be used for cleaning conjunctival tanks of different sizes.

[0050] Therefore, in application scenarios where the width of the conjunctival groove is much larger than the width of the cleaning component, since the electric roller mentioned above moves in one direction, it can only move forward in a straight line during cleaning. As a result, there are still spaces on the sides of the cleaning component that cannot be cleaned at the same time, which significantly increases the difficulty of cleaning the conjunctival groove, and results in low cleaning efficiency and poor cleaning effect.

[0051] In view of this, the applicant discloses a cleaning device that overcomes the above problems in this application.

[0052] It is worth noting that any content not described in detail in this specification is prior art known to those skilled in the art. Standard parts used in this application can all be purchased commercially, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods for each part all employ conventional methods such as bolts, rivets, and welding, which are mature technologies in the prior art. The machinery, parts, and equipment all use conventional models from the prior art, and the circuit connections use conventional connection methods from the prior art, which will not be detailed here.

[0053] The cleaning device in the example for cleaning the tofu skin coating tank (the overall length of the coating tank is, for example, 12m) includes: a main frame, and a controller and cleaning components connected to the main frame.

[0054] The main frame is supported by a power unit that drives the cleaning device. The cleaning unit includes a scraping component and a brush component detachably connected to the main frame; and the brush component and the power unit are driven to be connected to a controller, enabling the cleaning device to move selectively forward or backward, and to perform a brushing operation during the movement.

[0055] The controller controls the cleaning component and the power component, thereby enabling the cleaning device to perform more complex movements and more flexible cleaning operations by combining the cleaning component and the power component.

[0056] The controller operates the power unit, causing the main frame to move forward or backward, thus allowing for on-demand adjustments to the cleaning direction and trajectory. The cleaning components, detachably connected to the main frame, allow for the replacement of different sized components in various application scenarios to accommodate conjunctival grooves of different sizes, ensuring a proper match between the cleaning components and the groove dimensions for optimal cleaning results. Simultaneously, the controller independently controls the scraping and brush components to operate on demand and according to a schedule, further enhancing cleaning efficiency and effectiveness.

[0057] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0058] Reference Figures 1 to 8 The cleaning device includes an integrally molded main frame 1.

[0059] The battery 7 is placed inside the frame of the main body 1, such as Figure 1As shown. Battery 7 stores electricity through its equipped battery. Battery 7 is electrically connected to PLC controller 3. Battery 7 provides power to various electrical devices (mainly motors) in the cleaning device. A control switch can be installed on the cleaning device, and the control switch is electrically connected to PLC controller 3, thereby facilitating the control of the cleaning device's opening and closing.

[0060] The front end of the main frame 1 is equipped with a scraping component; the rear end is equipped with a scraping component. Figure 3 As shown. Figure 2 As shown, the scraping assembly includes a hinge joint 12 fixedly connected to the main frame 1, and a scraper bracket 2 fixedly connected to the movable end of the hinge joint. A scraper 11 is laterally slidably installed on the inner side of the scraper bracket 2, and the scraper 11 overlaps the bottom inner wall of the conjunctival groove.

[0061] In actual use, after the cleaning device is started, it will drive the scraper 11 located in front of it to move forward. During this process, the bottom of the scraper 11 is in direct contact with the bottom inner wall of the film-forming tank. Therefore, as the scraper 11 moves forward with the cleaning device, it can scrape the soy milk in the film-forming tank forward. The cleaning device will drive the scraper 11 to move forward continuously, thus pushing the soy milk forward until it is pushed into the discharge hole at the front of the film-forming tank and discharged, completing the scraping of soy milk by the scraper 11.

[0062] Because one end of the scraper bracket 2 is connected by a hinge joint 12, and because the hinge joint 12 can be flexibly flipped up and down, the scraper 11 can fall into the conjunctival groove and press against the inner wall surface of the conjunctival groove by its own weight.

[0063] Advantageously, two counterweights can be attached or tied above the scraper 11, with the counterweights positioned 10 cm away from the spring 14. Placing two counterweights on the scraper 11 increases the gravity of the scraper 11 as it falls, thus preventing it from being pushed up by the accumulated soy milk when scraping it.

[0064] The counterweight can be a cylindrical plate-shaped tungsten alloy counterweight with a diameter of 10-20cm and a weight of 200g. Tungsten alloy is a hard alloy, which can withstand strong impact and has good impact toughness, fracture toughness, fatigue strength, bending strength and good wear resistance. It is suitable for the food industry in this application. In addition, the addition of the counterweight can also reduce the vibration generated during the movement of the cleaning device and ensure the effect of scraper 11 on scraping soy milk liquid.

[0065] Furthermore, two mutually spaced springs 14 are fixedly connected to one end of the scraper 11. One end of each of the two springs 14 is fixed to a spring bracket 13; and one end of each of the two spring brackets 13 is fixed to the edge of the main frame 1. The arrangement of the springs 14 increases the stability of the connection between the scraper bracket 2 and the main frame 1, reducing vibration; on the other hand, due to the elastic force of the springs 14, the downward force of the scraper 11 is increased, making it easier for the scraper 11 to scrape off the soy milk.

[0066] The scraper 11 is made of stainless steel. Stainless steel has strong corrosion resistance and wear resistance, and will not rust or deform even after long-term use. It has high safety and reliability, and is suitable for cleaning products in the food industry, as well as for cleaning the film-forming tank in this application.

[0067] Furthermore, since the scraper 11 is horizontally inserted and fixed between the scraper 11, the scraper 11 can be easily disassembled. Then, scraper 11 of different lengths can be replaced according to the inner diameter width of the film formation tank, thereby meeting the cleaning requirements of different sizes of film formation tanks. When the length of the scraper 11 is adapted to the film formation tank, the scraper 11 can scrape and clean the soy milk liquid in one go during the forward movement, thus improving the cleaning efficiency.

[0068] Two vertically mounted fixed slide plates 8 are fixed to the rear end of the main frame 1. A brush holder 6 is slidably mounted on one side of each fixed slide plate 8 via bolts. Inside the brush holder 6, a brush 5, controlled by a brush motor 9 and connected to a brush timing belt 10, is mounted. Figure 4 As shown.

[0069] See Figure 3 The two power components 4 installed below the main frame 1 include a power motor 4-4 and a brush motor 9. The PLC controller 3 is electrically connected to both the power motor 4-4 and the brush motor 9. The PLC controller 3 controls the start and stop of the brush motor 9, indirectly driving the rotation of the brush 5.

[0070] When the brush 5, which is in contact with the bottom of the conjunctival groove, rotates, it can rotate and brush the soybean milk residue left in the conjunctival groove after being scraped off by the scraper 11 once, and perform a second cleaning of the soybean milk. This allows the horizontally moving scraper 11 and the rotating brush 5 to work together, greatly increasing the cleaning and removal effect of the soybean milk and improving work efficiency.

[0071] Furthermore, the fixed slide plate 8 is provided with vertically arranged positioning holes, and a rectangular protrusion is integrally formed at one end of the brush holder 6. The protrusion is snapped and fixed into the slide groove of the fixed slide plate 8. The positioning holes are connected to the mounting holes opened on the brush holder 6 (the mounting holes are opened from the brush holder 6 to the protrusion), and the bolts are screwed into the positioning holes through the mounting holes.

[0072] The installed bolts ensure stable installation of the brush holder 6 and the fixed slide plate 8. Because multiple positioning holes are opened on the fixed slide plate 8 and two mounting holes are opened on the brush holder 6, the two bolts are fixed to the fixed slide plate 8 through the mounting holes, ensuring the stability of the brush holder 6 installation.

[0073] In the example, the main function of the fixed slide plate 8 is to connect and install the brush holder 6, and because multiple positioning holes are opened on the fixed slide plate 8, the position and height of the brush holder 6 can be controlled along the fixed slide plate 8.

[0074] When using the cleaning device, if only the front scraper 11 is needed and the brush 5 is not required, the brush holder 6 can be raised, causing the brush 5 and brush motor 9 fixed inside the brush holder 6 to rise together. This moves the brush 5, which would normally rest at the bottom of the congealing tank along with the scraper 11, away from the inner wall of the congealing tank. Since the brush 5 does not contact the inner wall of the congealing tank, only the front scraper 11 can scrape away the soy milk when the cleaning device is activated. This increases the selectivity of using the cleaning device and expands the applicability of the cleaning device in this application.

[0075] Among them, such as Figure 5 Figure 6 Figure 7 and Figure 8 As shown, the power assembly 4 includes:

[0076] The wheel bracket 4-1 is fixedly connected to the bottom of the main frame 1. The power motor 4-4 is fixed to the bottom of the wheel bracket 4-1. The wheel 4-6 is connected to the power motor 4-4 through a coupling. The two driven shafts 4-2 are connected to the wheel 4-6 through two driven synchronous belts 4-3. The two driven shafts 4-2 are fixedly connected to the wheel 4-5.

[0077] One end of the wheel 4-6 is connected to the power motor 4-4, and the other end is fixedly connected to the inner ring of the bearing. The bearing is fixedly mounted on the wheel side bracket 4-1, and two pairs of bearings are also mounted on the wheel side bracket 4-1. Two driven shafts 4-2 are installed between the two pairs of bearings.

[0078] During operation, the start and stop of the power unit 4 are controlled by the PLC controller 3, which controls the start and stop of the power motor 4-4. After the power motor 4-4 starts, it will drive the wheel 4-6, which is directly fixed to it, to rotate.

[0079] The wheel 4-6 and the two driven shafts 4-2 on both sides are connected by driven synchronous belts 4-3. Therefore, when the wheel 4-6 rotates, it will also drive the two driven synchronous belts 4-3 to rotate, and the two driven synchronous belts 4-3 will simultaneously drive the driven shafts 4-2 connected to them to rotate.

[0080] The two driven shafts 4-2 are connected to wheels 4-5 at both ends, so the rotation of the driven shafts 4-2 will eventually drive the rotation of the wheels 4-5. In a specific configuration, one power motor 4-4 indirectly controls the movement of the two wheels 4-5. Furthermore, the power motors 4-4 distributed on both sides, when running simultaneously under the control of the PLC controller 3, will drive all four wheels 4-5 to rotate in the same direction, thereby driving the entire cleaning device to achieve linear movement within the film-forming tank.

[0081] When the PLC controller 3 needs to control the power motor 4-4 to reverse, it will indirectly drive the four wheels 4-5 to move in the opposite direction simultaneously. At this time, because the power motor 4-4 and the wheels 4-5 rotate in opposite directions, the cleaning requirements can be met. That is, when the cleaning device needs to return to the initial cleaning end for cleaning again, it can be moved by hand or automatically moved by the PLC controller 3 controlling the power unit 4 to move in the opposite direction, thereby reducing manpower.

[0082] The operating procedures for using the cleaning device will be explained later.

[0083] Before using the cleaning device of this application, it is necessary to manually scrape off the soybean milk liquid in the initial part to one side using the scraper 11, thereby making room for the placement of the cleaning device. The scraping distance only needs to be greater than the length of the cleaning device. Then, the cleaning device of this application is placed in the film-forming tank where the soybean milk liquid has been scraped off in the first step.

[0084] Next, the cleaning device is started, and a switch for direct control of the device's start is installed on the cleaning device. The switch is electrically connected to the PLC controller 3. After the cleaning device is started, the PLC controller 3 will control the start of the power assembly 4, that is, control the two power motors 4-4 electrically connected to it to start simultaneously.

[0085] After the power motor 4-4 starts, it will drive the rotation of wheel 4-6, which in turn drives the rotation of wheel 4-5 through the connection and transmission of driven synchronous belt 4-3 and driven shaft 4-2. At this time, all four wheels 4-5 rotate in the same direction, driving the entire cleaning device forward and driving the front scraper 11 forward.

[0086] Because the bottom of the scraper 11 contacts the bottom inner wall of the conjunctival groove due to its own gravity, and the scraper 11 is in full contact with the bottom inner wall of the conjunctival groove under the elastic action of the spring 14, the scraper 11 will scrape the soy milk liquid in front of it forward during the forward movement of the cleaning device.

[0087] At the same time, the PLC controller 3 will control the start of the brush motor 9. The brush motor 9 drives the brush 5 to rotate under the connection of the brush timing belt 10. The rotation of the brush 5 can rotate and clean the soy milk liquid that is still left on the inner wall of the film formation tank after the scraper 11 has been scraped off. The brush bristles can brush away the soy milk liquid attached to the film formation tank, achieving the effect of secondary cleaning.

[0088] Finally, after cleaning with the cleaning device, a high-pressure water gun connected to a water pipe can be manually used to spray and wash the film-forming tank to remove all the remaining soy milk liquid. This ensures that the film-forming tank is clean, tidy, and hygienic after cleaning, thus making full preparations for the subsequent use of the film-forming tank for tofu skin production.

[0089] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the accompanying drawings. They are only used to facilitate the description of this utility model and simplify the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0090] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0091] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A cleaning device for cleaning in a yuba coagulation tank, characterized by, The cleaning device includes: A main frame supported by a power unit that drives the cleaning device; and a controller and cleaning unit connected to the main frame. The cleaning assembly includes a scraping assembly and a brush assembly that are detachably connected to the main frame; The brush assembly and power assembly are driven to be connected to the controller, enabling the cleaning device to move forward or backward selectively, and to perform a brushing operation during the movement.

2. The cleaning apparatus of claim 1, wherein The scraping component and the brush component are located at opposite ends of the main frame.

3. The cleaning device according to claim 1 or 2, characterized in that The scraping assembly includes: a scraper bracket and a scraper; The main frame is connected to the scraper bracket via the movable end of a fixedly connected hinge joint. The scraper is slidably mounted on the scraper bracket and is configured to overlap within the conjunctival groove.

4. The cleaning device according to claim 3, characterized in that, The scraper is made of stainless steel. And / or, the scraper is attached to or the rope is tied to a counterweight.

5. The cleaning apparatus of claim 3, wherein The scraper is attached to or has two counterweights attached to it, and the two counterweights are located close to the spring.

6. The cleaning apparatus according to claim 1 or 2, characterized by The brush assembly includes: a fixed slide plate, a brush, a brush holder, and a brush motor for driving the brush to rotate; Two vertically arranged fixed sliding plates are fixed to the main frame; The brush holder is slidably mounted on one side of the fixed slide plate, the brush is mounted on the inside of the brush holder, and the brush motor is connected to the brush drive via a brush timing belt.

7. The cleaning apparatus of claim 6, wherein The fixed slide plate has vertically arranged positioning holes that communicate with the mounting holes on the brush holder. The fixed slide plate is slidably connected to the brush holder by bolts, which are screwed into the positioning holes through the mounting holes.

8. The cleaning apparatus of claim 1, wherein The power assembly includes: a wheel-side bracket, a power motor, a driven shaft, and two wheels; The wheel-side bracket is fixedly connected to the bottom of the main frame; A power motor fixed to the bottom of the wheel-side bracket; One of the wheels is connected to the drive motor via a coupling, and the wheel is also connected to two driven shafts via two driven synchronous belts respectively; The two driven shafts are also fixedly connected to another wheel.

9. The cleaning apparatus of claim 8, wherein, One end of one of the wheels is connected to the power motor, and the other end is fixedly connected to the inner ring of the bearing; The bearing is fixedly mounted on the wheel-side bracket, which also has two pairs of bearings mounted on it; the two driven shafts are arranged in parallel and are installed between the two pairs of bearings.

10. The cleaning apparatus of claim 1, wherein, The two ends of the scraper are respectively fixedly connected to two springs that are far apart from each other. The two springs are also respectively fixed to two spring brackets, and the two spring brackets are respectively fixed to the side of the main frame.

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