Garbage crushing device for construction industry
By designing a multiple crushing system and a linkage conveyor mechanism, combining the pentagonal crushing roller and vibrator structure, multiple crushing of construction waste is achieved, solving the problem of low crushing degree of construction waste in the existing technology, and improving crushing Effects and recycling rate.
Patent Information
- Application Number
- CN202420626429.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-03-28
AI Technical Summary
The existing construction waste crushing device adopts a single crushing method, which cannot completely crush hard construction waste with a lot of aggregates, and is not very crushed and has poor crushing effect.
A construction waste crushing device with multiple crushing systems is designed, including a crushing bin, feeding port, discharge port, crushing unit, horizontal conveyor belt, circulating conveyor belt, vertical feeding mechanism, material retaining mechanism and grinding module, through five The joint operation and intermittent transmission of crushing rollers distributed in pentagonal corners realize multiple crushing of construction waste, and use vibrator and leakage structure to assist in the rapid discharge of crushed materials.
It greatly improves the crushing effect of construction waste, and the particle size after crushing is basically the same, which helps the recycling and reuse of construction waste, and solves the problem of low crushing degree and poor crushing effect of single-time crushing devices.
Smart Images

Figure CN222174219U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of garbage crushing devices, in particular to a garbage crushing device used in the construction industry. Background Art
[0002] The garbage generated by the construction industry, such as demolished concrete and asphalt, is different from general industrial waste and domestic waste. It does not require a complex series of industrial recycling and treatment processes. It only needs to be simply crushed to extract the internal aggregate and powder structure for recycling and reuse. The recycling cost is low, the recycling rate is high, and it has great economic value.
[0003] At present, there are many kinds of construction waste crushing devices on the market. The crushing units all achieve crushing by applying external pressure or impact force to squeeze or collide the construction waste. However, the current construction waste crushing, whether it is a stirring or crushing method, is only a single crushing form. This single crushing method often cannot completely crush the hard construction waste with a lot of aggregates into powder of suitable particle size.
[0004] Therefore, in view of the fact that the above-mentioned existing single-time crushing device for construction waste has a low crushing degree and poor crushing effect, a construction waste crushing device with a multiple crushing system can be designed to achieve the purpose of completely crushing the construction waste. Utility Model Content
[0005] In order to overcome the problem that the existing single-time crushing device for construction waste has low crushing degree and poor crushing effect.
[0006] The technical scheme of the utility model is: a garbage crushing device for the construction industry, comprising a crushing bin, a material feed port, a material discharge port, a crushing unit, a horizontal conveyor belt, a circulating conveyor belt, a vertical feeding mechanism, a material blocking mechanism, and a grinding module; a material feed port is arranged at the upper end of the crushing bin, a material discharge port is arranged at the lower end of the crushing bin, a crushing unit which is located below the material feed port and is composed of five crushing rollers distributed in a pentagonal shape is installed in the crushing bin, a horizontal conveyor belt arranged below the crushing unit and a circulating conveyor belt arranged above the side of the crushing unit are installed in the crushing bin, the horizontal conveyor belt and the circulating conveyor belt both transmit materials intermittently through program setting, a vertical feeding mechanism for sending crushed building materials from the horizontal conveyor belt to the circulating conveyor belt is arranged between the feeding terminal of the horizontal conveyor belt and the feeding head end of the circulating conveyor belt, a material blocking mechanism for guiding materials is arranged below the horizontal conveyor belt, and a roller type grinding module is arranged in the crushing bin near the top of the material discharge port.
[0007] Preferably, the horizontal conveyor belt, the circulating conveyor belt and the vertical feeding mechanism form an intermittent cyclic linkage operation around the crushing unit in the crushing bin to achieve multiple crushing of construction waste. The qualified waste after crushing is vibrated and dropped on the blocking mechanism into the grinding module for final processing.
[0008] Preferably, the crushing unit includes an intermediate crushing roller, a head crushing roller, and a tail crushing roller; there are two intermediate crushing rollers and they are arranged below the feeding port, two head crushing rollers are arranged and they are located above the intermediate crushing rollers, one tail crushing roller is arranged and it is located below the intermediate crushing rollers, the spacing between the intermediate crushing rollers is 10-15cm, the spacing between the head crushing rollers and the spacing between the middle crushing rollers are both 8-10cm, and the spacing between the tail crushing roller and the two intermediate crushing rollers is 3-5cm. The construction waste first falls on the head crushing roller, and the head crushing roller rotates to the opposite side, so that the construction materials are transmitted to the intermediate crushing roller rotating to the opposite side, and an extrusion crushing effect is generated through the gap between the head crushing roller and the intermediate crushing roller, and the particles enter the cavity enclosed by the intermediate crushing roller and the tail crushing roller with a particle size of less than 8-10cm, and finally pass through the gap between the tail crushing roller and the intermediate crushing roller, and fall onto the horizontal conveyor belt with a particle size of less than -cm.
[0009] Preferably, the horizontal conveyor belt is arranged below the tail crushing roller and transmits the crushed construction waste from left to right. The circulating conveyor belt is arranged above the right of the head crushing roller and is slightly inclined upward from right to left. The circulating conveyor belt transmits the crushed construction waste from right to left. The construction waste falling on the horizontal conveyor belt is transported from left to right. The horizontal conveyor belt is transmitted intermittently. The transmission gap is controlled by the program setting. The interval time can be 1-2 minutes. The material is sent to the vertical feeding mechanism and especially lifted longitudinally to the circulating conveyor belt, and then transported to the crushing unit again from right to left by the circulating conveyor belt.
[0010] Preferably, the vertical feeding mechanism includes a material holding box, a sliding port, a blocking plate, and a vertical conveying module; the inner bottom wall of the material holding box is a ramp structure and is arranged on the right side of the horizontal conveyor belt, the vertical conveying module is installed on the inner wall of the crushing bin, the material holding box moves up and down between the horizontal conveyor belt and the circulating conveyor belt along the vertical conveying module, a sliding port is provided at the left end of the material holding box, and a blocking plate driven by a cylinder to lift and control the opening and closing of the sliding port is provided at the left end of the material holding box. After the material holding box receives the construction waste sent out from the horizontal conveyor belt, it is lifted to the circulating conveyor belt through the vertical conveying module. The vertical conveying module can be a cylinder, a linear motor, a screw drive motor, a gear chain drive system, etc. By opening the blocking plate, the construction waste is discharged from the sliding port onto the circulating conveyor belt.
[0011] Preferably, the material blocking mechanism includes a material blocking plate, a strainer, a bracket, a horizontal drive module, and a sealing plate; a material blocking plate inclined toward the lower left is welded at the right end of the inner wall of the crushing bin, a strainer is installed at the lower end of the material blocking plate, a bracket is welded at the left end of the inner wall of the crushing bin, a horizontal drive module is installed at the right end of the bracket, and the sealing plate is a plate-like structure slightly inclined downward from left to right and is arranged below the horizontal conveyor belt. The sealing plate is fixedly connected to the power output terminal of the horizontal drive module. When the horizontal conveyor belt is transporting construction waste, the horizontal drive module controls the sealing plate to extend to the right, connect with the material blocking plate and the strainer, and cover the material box. The construction waste first enters the V-shaped material trough formed by the material blocking plate and the sealing plate for screening and separation, and the unqualified crushed material will naturally fall into the material box only after the sealing plate is withdrawn.
[0012] Preferably, the vibrator is arranged below the sealing plate and on the left side of the vertical feeding mechanism. The vibrating element of the vibrator acts on the sealing plate to assist in vibrating the material. The grinding module is a roller conveyor composed of several grinding rollers with a frosted layer on the surface. The roller conveyor tilts from right to left and below. Two adjacent grinding rollers are driven by a motor to rotate and grind the crushed construction waste. When the construction waste is screened and separated in the V-shaped trough formed by the baffle plate and the sealing plate, the vibrator causes the sealing plate to vibrate, which accelerates the material screening process and reduces the occurrence of blockage. In addition, the screened garbage falls on the roller conveyor composed of the grinding rollers. As the roller conveyor is driven, the garbage is squeezed between the two adjacent grinding rollers and finally leaks out from the gap between the two grinding rollers.
[0013] Preferably, the back plate is fixedly connected to the upper end of the crushing bin and is located on one side of the feed inlet. A water supply mechanism consisting of a water tank and a pump is installed on the upper end of the crushing bin. A spray unit consisting of a number of spray heads connected to the water outlet of the water supply mechanism is installed on the side of the back plate facing the feed inlet. The pump draws water out of the water tank and sprays it through the spray unit to form water mist near the feed inlet, thereby reducing dust.
[0014] Beneficial effects of the utility model:
[0015] 1. Based on the original single-time crushing equipment for construction waste, the horizontal conveyor belt, the circulating conveyor belt and the vertical feeding mechanism are used in linkage operation to realize multiple crushing of construction waste, which greatly improves the final crushing effect of construction waste. The particle size of the crushed construction waste is basically the same, which is conducive to the recycling and reuse of construction waste;
[0016] 2. Through the joint operation of five crushing rollers of different sizes and pentagonal corner point distribution, the rollers squeeze the construction waste and at the same time, they squeeze and transmit the construction waste inward, forming a continuous squeezing and crushing force, further improving the crushing effect;
[0017] 3. The vibrator and the screen structure of the material blocking mechanism can assist in the rapid discharge of qualified construction waste chips and avoid the materials being blocked on the material blocking mechanism. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 The first three-dimensional structure diagram of the internal structure of the garbage crushing device for the construction industry of the utility model is shown;
[0019] Figure 2 The second three-dimensional structure diagram of the internal structure of the garbage crushing device for the construction industry of the utility model is shown;
[0020] Figure 3 The diagram shows the external three-dimensional structure of the garbage crushing device for the construction industry of the utility model;
[0021] Figure 4 The three-dimensional structure diagram of the vertical feeding mechanism of the garbage crushing device for the construction industry of the utility model is shown;
[0022] Figure 5 What is shown is a three-dimensional structural schematic diagram of the material blocking mechanism of the garbage crushing device for the construction industry of the utility model.
[0023] Explanation of the reference numerals: 1. Crushing bin; 2. Feed inlet; 3. Discharge outlet; 5. Horizontal conveyor belt; 6. Circular conveyor belt; 9. Vibrator; 10. Material baffle plate; 11. Screen; 12. Grinding roller; 13. Back plate; 14. Water supply mechanism; 15. Spray unit; 401. Middle crushing roller; 402. Head crushing roller; 403. Tail crushing roller; 701. Material box; 702. Sliding port; 703. Blocking plate; 801. Bracket; 802. Horizontal drive module; 803. Closing plate. DETAILED DESCRIPTION
[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0025] See also Figure 1-2The utility model provides an embodiment: a garbage crushing device for the construction industry, including a crushing bin 1, a feed port 2, a discharge port 3, a crushing unit, a horizontal conveyor belt 5, a circulating conveyor belt 6, a vertical feeding mechanism, a material blocking mechanism, and a grinding module; the crushing bin 1 is provided with a feed port 2 at the upper end, and a discharge port 3 is provided at the lower end of the crushing bin 1. A crushing unit is installed in the crushing bin 1 below the feed port 2 and composed of five crushing rollers with pentagonal corner points. A horizontal conveyor belt 5 arranged below the crushing unit and a circulating conveyor belt 6 arranged above the side of the crushing unit are installed in the crushing bin 1. The horizontal conveyor belt 5 and the circulating conveyor belt 6 are both passed through The program is set to transmit materials intermittently. A vertical feeding mechanism for conveying the crushed building materials from the horizontal conveyor belt 5 to the circulating conveyor belt 6 is arranged between the feeding terminal of the horizontal conveyor belt 5 and the feeding head end of the circulating conveyor belt 6. A blocking mechanism for guiding the material is arranged below the horizontal conveyor belt 5. A roller grinding module is arranged above the discharge port 3 in the crushing bin 1. The horizontal conveyor belt 5, the circulating conveyor belt 6 and the vertical feeding mechanism form an intermittent cyclic linkage operation around the crushing unit in the crushing bin 1 to realize multiple crushing of the construction waste. The qualified garbage after crushing is vibrated and dropped on the blocking mechanism into the grinding module for final processing.
[0026] See also Figure 3-4In this embodiment, the crushing unit includes a middle crushing roller 401, a head crushing roller 402, and a tail crushing roller 403; the middle crushing roller 401 has two and is arranged below the feed port 2, the head crushing roller 402 has two and is located above the middle crushing rollers 401, and the tail crushing roller 403 has one and is located below the middle crushing rollers 401. The spacing between the middle crushing rollers 401 is 10-15cm, the spacing between the head crushing rollers 402 and the spacing between the middle crushing rollers 401 are both 8-10cm, and the spacing between the tail crushing roller 403 and the two middle crushing rollers 401 is 3-5cm. The construction waste first falls on the head crushing roller 40 2, the head crushing roller 402 rotates toward the opposite side, so that the construction materials are transmitted to the middle crushing roller 401 rotating toward the opposite side, and the gap between the head crushing roller 402 and the middle crushing roller 401 produces an extrusion and crushing effect, and enters the cavity enclosed between the middle crushing roller 401 and the tail crushing roller 403 with a particle size of less than 8-10 cm, and finally passes through the gap between the tail crushing roller 403 and the middle crushing roller 401, and falls onto the horizontal conveyor belt 5 with a particle size of less than 3-5 cm. The horizontal conveyor belt 5 is arranged below the tail crushing roller 403 and conveys the crushed construction waste from left to right. The circulating conveyor belt 6 is arranged above the right side of the head crushing roller 402 and automatically It is slightly inclined upward from right to left, and the circulating conveyor belt 6 transmits and conveys the unqualified construction waste from right to left. The construction waste falling on the horizontal conveyor belt 5 is transported from left to right. The horizontal conveyor belt 5 is intermittently transmitted, and the transmission gap is controlled by the program setting. The interval time can be 1-2min, and it is sent to the vertical feeding mechanism and especially lifted longitudinally to the circulating conveyor belt 6, and then transported from right to left to the crushing unit again by the circulating conveyor belt 6. The vertical feeding mechanism includes a material holding box 701, a sliding port 702, a blocking plate 703, and a vertical conveying module; the inner bottom wall of the material holding box 701 is a ramp structure and is arranged on the right side of the horizontal conveyor belt 5, and the vertical conveying module is installed on the inner side wall of the crushing bin 1. The material holding box 701 is vertically The conveying module moves up and down between the horizontal conveyor belt 5 and the circulating conveyor belt 6. A sliding port 702 is provided at the left end of the material box 701. A blocking plate 703 driven by a cylinder to lift and control the opening and closing of the sliding port 702 is provided at the left end of the material box 701. After the material box 701 receives the construction waste sent from the horizontal conveyor belt 5, it is lifted to the circulating conveyor belt 6 through the vertical conveying module. The vertical conveying module can be a cylinder, a linear motor, a screw drive motor, a gear chain drive system, etc. By opening the blocking plate 703, the construction waste is discharged from the sliding port 702 to the circulating conveyor belt 6. The blocking mechanism includes a blocking plate 10, a leakage net 11, a bracket 801, a horizontal drive module 802, and a sealing plate 803.A baffle plate 10 tilted toward the lower left is welded to the right end of the inner wall of the crushing bin 1, and a leakage net 11 is installed at the lower end of the baffle plate 10. A bracket 801 is welded to the left end of the inner wall of the crushing bin 1, and a horizontal driving module 802 is installed at the right end of the bracket 801. The sealing plate 803 is a plate-like structure slightly tilted downward from left to right and is arranged below the horizontal conveyor belt 5. The sealing plate 803 is fixedly connected to the power output terminal of the horizontal driving module 802. During the process of conveying construction waste by the horizontal conveyor belt 5, the horizontal driving module 802 controls the sealing plate 803 to extend to the right, connect with the baffle plate 10 and the leakage net 11, and cover the material holding box 701. The construction waste first enters the V-shaped material trough formed by the baffle plate 10 and the sealing plate 803 for screening and separation, and the unqualified crushed material will be automatically separated only after the sealing plate 803 is withdrawn. The construction waste is then dropped into the material storage box 701. The vibrator 9 is arranged below the sealing plate 803 and on the left side of the vertical feeding mechanism. The vibrating element of the vibrator 9 acts on the sealing plate 803 to assist in vibrating the material. The grinding module is a roller table composed of a plurality of grinding rollers 12 with a frosted layer on the surface. The roller table is inclined from right to left and below. Two adjacent grinding rollers 12 are driven by a motor to rotate and grind the crushed construction waste. When the construction waste is screened and separated in the V-shaped trough formed by the baffle plate 10 and the sealing plate 803, the vibrator 9 makes the sealing plate 803 vibrate to accelerate the material screening process and reduce the occurrence of blockage. In addition, the screened garbage falls on the roller table composed of the grinding rollers 12. As the roller table is driven, the garbage is squeezed between the two adjacent grinding rollers 12 and finally leaks out from the gap between the two grinding rollers 12.
[0027] See also Figure 5 In this embodiment, the back plate 13 is fixedly connected to the upper end of the crushing bin 1 and is located on the side of the feed port 2. A water supply mechanism 14 composed of a water tank and a pump is installed on the upper end of the crushing bin 1. A spray unit 15 composed of a plurality of spray heads connected to the water outlet of the water supply mechanism 14 is installed on the side of the back plate 13 facing the feed port 2. The pump draws water out of the water tank and sprays it through the spray unit 15 to form water mist near the feed port 2, thereby playing a role in dust reduction.
[0028] During operation, the user puts the construction waste into the crushing bin 1 through the feed port 2, and the construction waste first falls on the head crushing roller 402, which rotates toward the opposite side, so that the construction waste is transmitted to the middle crushing roller 401 rotating toward the opposite side, and the gap between the head crushing roller 402 and the middle crushing roller 401 produces an extrusion crushing effect, and the particles with a diameter of less than 8-10 cm enter the cavity enclosed by the middle crushing roller 401 and the tail crushing roller 403, and finally pass through the gap between the tail crushing roller 403 and the middle crushing roller 401, and fall onto the horizontal conveyor belt 5 with a particle size of less than 3-5 cm;
[0029] While crushing, the pump draws water out of the water tank and sprays it out through the spray unit 15, forming water mist near the feed inlet 2 to reduce dust.
[0030] While the horizontal conveyor belt 5 conveys the construction waste to the right, the horizontal drive module 802 controls the sealing plate 803 to extend to the right, connect with the baffle plate 10 and the filter screen 11, and cover the material box 701. The construction waste first enters the V-shaped trough formed by the baffle plate 10 and the sealing plate 803. The vibrator 9 makes the sealing plate 803 vibrate to accelerate the material to pass through the filter screen 11.
[0031] The sieved garbage falls on the roller table formed by the grinding rollers 12. As the roller table drives, the garbage is squeezed between two adjacent grinding rollers 12 and finally leaks out from the gap between the two grinding rollers 12.
[0032] The horizontal driving module 802 controls the withdrawal of the sealing plate 803, and the unscreened crushed materials naturally fall into the material box 701. The vertical conveying module sends the material box 701 to the circulating conveyor belt 6, opens the blocking plate 703, and the construction waste is discharged from the sliding port 702 onto the circulating conveyor belt 6, and is transported from right to left by the circulating conveyor belt 6 to the crushing unit for repeated crushing.
[0033] Through the above steps, on the basis of the original single-time crushing equipment for construction waste, the linkage operation of the horizontal conveyor belt 5, the circulating conveyor belt 6 and the vertical feeding mechanism is utilized to realize multiple crushing of construction waste, which greatly improves the final crushing effect of construction waste. The particle size of the crushed construction waste is basically the same, which is conducive to the recycling and reuse of construction waste, so as to solve the problem of low crushing degree and poor crushing effect of the existing single-time crushing device for construction waste.
[0034] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.
Claims
1. A garbage crushing device for the construction industry, comprising a crushing bin (1), an inlet (2), and an outlet (3); characterized in that: The invention also comprises a crushing unit, a horizontal conveyor belt (5), a circulating conveyor belt (6), a vertical feeding mechanism, a blocking mechanism and a grinding module; a feeding port (2) is arranged at the upper end of the crushing bin (1), a discharging port (3) is arranged at the lower end of the crushing bin (1), a crushing unit is installed in the crushing bin (1) and is located below the feeding port (2) and is composed of five crushing rollers with pentagonal corner points distributed; a horizontal conveyor belt (5) arranged below the crushing unit and a circulating conveyor belt (6) arranged above the side of the crushing unit are installed in the crushing bin (1); the horizontal conveyor belt (5) and the circulating conveyor belt (6) are both programmed to intermittently transport materials; a vertical feeding mechanism for conveying crushed building materials from the horizontal conveyor belt (5) to the circulating conveyor belt (6) is arranged between the feeding terminal of the horizontal conveyor belt (5) and the feeding head end of the circulating conveyor belt (6); a blocking mechanism for guiding materials is arranged below the horizontal conveyor belt (5); and a roller type grinding module is arranged in the crushing bin (1) near the top of the discharging port (3).
2. A garbage crushing device for the construction industry according to claim 1, characterized in that: The crushing unit comprises a middle crushing roller (401), a head crushing roller (402), and a tail crushing roller (403); the middle crushing rollers (401) are provided with two and are arranged below the feed inlet (2); the head crushing rollers (402) are provided with two and are located above between the middle crushing rollers (401); the tail crushing roller (403) is provided with one and is located below between the middle crushing rollers (401); the spacing between the middle crushing rollers (401) is 10-15 cm; the spacing between the head crushing rollers (402) and the spacing between the head crushing rollers (402) and the middle crushing rollers (401) are both 8-10 cm; the spacing between the tail crushing roller (403) and the two middle crushing rollers (401) is both 3-5 cm.
3. A garbage crushing device for the construction industry according to claim 2, characterized in that: The horizontal conveyor belt (5) is arranged below the tail crushing roller (403) and is driven from left to right to convey the crushed construction waste. The circulating conveyor belt (6) is arranged above the right side of the head crushing roller (402) and is slightly inclined upward from right to left. The circulating conveyor belt (6) is driven from right to left to convey the crushed unqualified construction waste.
4. The garbage crushing device for the construction industry according to claim 1, characterized in that: The vertical feeding mechanism comprises a material holding box (701), a material sliding port (702), a blocking plate (703), and a vertical conveying module; the inner bottom wall of the material holding box (701) is a ramp structure and is arranged on the right side of the horizontal conveyor belt (5); the vertical conveying module is installed on the inner wall of the crushing bin (1); the material holding box (701) moves up and down between the horizontal conveyor belt (5) and the circulating conveyor belt (6) along the vertical conveying module; the material holding box (701) is provided with a material sliding port (702) at the left end; and the material holding box (701) is provided with a blocking plate (703) driven by a cylinder to move up and down and control the opening and closing of the material sliding port (702) at the left end.
5. The garbage crushing device for the construction industry according to claim 1, characterized in that: The material blocking mechanism comprises a material blocking plate (10), a screen (11), a bracket (801), a horizontal driving module (802), and a sealing plate (803); a material blocking plate (10) tilted downward to the left is welded to the right end of the inner wall of the crushing bin (1), a screen (11) is installed at the lower end of the material blocking plate (10), a bracket (801) is welded to the left end of the inner wall of the crushing bin (1), a horizontal driving module (802) is installed at the right end of the bracket (801), the sealing plate (803) is a plate-shaped structure tilted slightly downward from left to right and is arranged below the horizontal conveyor belt (5), and the sealing plate (803) is fixedly connected to the power output terminal of the horizontal driving module (802).
6. The garbage crushing device for the construction industry according to claim 1, characterized in that: The vibrator (9) is arranged below the sealing plate (803) and on the left side of the vertical feeding mechanism. The vibrating element of the vibrator (9) acts on the sealing plate (803) to assist in vibrating the material. The grinding module is a roller conveyor composed of a plurality of grinding rollers (12) with a frosted layer on the surface. The roller conveyor is inclined from right to the lower left. Two adjacent grinding rollers (12) are driven by a motor to rotate and grind the crushed construction waste.
7. The garbage crushing device for the construction industry according to claim 1, characterized in that: The back plate (13) is fixedly connected to the upper end of the crushing bin (1) and is located on one side of the feed inlet (2). A water supply mechanism (14) composed of a water tank and a pump mechanism is installed on the upper end of the crushing bin (1). A spray unit (15) composed of a plurality of spray heads connected to the water outlet of the water supply mechanism (14) is installed on the side of the back plate (13) facing the feed inlet (2).
