A mechanical parts spraying device for preventing sedimentation

Abstract

The present invention discloses a mechanical parts spraying device for preventing sedimentation, comprising a base plate, a main mixing device is fixedly installed at one end of the top of the base plate, a sub-mixing device is fixedly installed at a side of the top of the base plate away from the main mixing device, a connecting pipe is fixedly connected to one side of the sub-mixing device, and a high-pressure nozzle is connected to one end of the connecting pipe. In the above scheme, a circulating pump is set to make the upper layer solution inside the insulation box pass through the circulating pipe and be sprayed out from the liquid outlet, so that in the process of the spraying liquid circulating up and down, the sediment at the bottom of the insulation box is flushed upward to make the sediment float, thereby improving the mixing effect of the spraying liquid and the mixing efficiency of the spraying liquid. The spraying liquid inside the insulation box is at a suitable temperature, which effectively improves the mixing efficiency of the spraying liquid and reduces the generation of precipitation of the spraying liquid. When spraying the mechanical parts, the high-pressure water pump is started to make the spraying device directly spray, thereby improving the uniformity and efficiency of the spraying of the spraying device.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical parts spraying, and more specifically, to a mechanical parts spraying device capable of preventing precipitation. Background Art

[0002] Mechanical parts, also known as mechanical elements, are the basic components of machinery and are the inseparable individual parts that make up machinery and machines. In the machinery manufacturing industry, the surface treatment of mechanical parts is a crucial process, which directly affects the corrosion resistance, wear resistance and aesthetics of the parts. Spraying technology, as a common way of surface treatment, is widely used in the processing of various mechanical parts.

[0003] After spraying, mechanical parts need to be dried and replaced with other mechanical parts. During this process, the cavity storing the spray liquid is in a static state while the mechanical parts are sprayed and waiting for the next part to arrive. This can easily lead to precipitation of the spray liquid and make it difficult to evenly distribute the sprayed liquid on the surface of the parts, thus affecting the appearance of the mechanical parts. Although some spray devices can realize automatic stirring to prevent precipitation of the spray liquid, before each processing, it is necessary to stir the spray liquid first and wait until the spray liquid is evenly stirred before spraying, which affects the spraying efficiency of the spray device. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a mechanical parts spraying device that prevents sedimentation. In the process of the spraying liquid circulating up and down, the sedimentation at the bottom of the insulation box is flushed upward to make the sedimentation float, thereby improving the mixing effect of the spraying liquid, and improving the mixing efficiency of the spraying liquid. The spraying liquid inside the insulation box is at a suitable temperature, which effectively improves the mixing efficiency of the spraying liquid, reduces the generation of spraying liquid sedimentation, avoids waiting time for the spraying liquid to be evenly stirred, and improves the uniformity and spraying efficiency of the spraying device to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a mechanical parts spraying device for preventing precipitation, comprising a base plate, a main mixing device is fixedly installed at one end of the top of the base plate, a secondary mixing device is fixedly installed on the side of the top of the base plate away from the main mixing device, a connecting pipe is fixedly connected to one side of the secondary mixing device, a high-pressure nozzle is connected to one end of the connecting pipe, and a stirring device is arranged inside the main mixing device;

[0006] The main mixing device comprises an insulation box, a temperature sensor is fixedly installed on the top of the inner wall of the insulation box, a feeding pipe is fixedly connected to one side of the top of the insulation box, a discharge pipe is fixedly connected to one side of the bottom of the insulation box, a solenoid valve is fixedly installed at one end of the discharge pipe, a base block is fixedly installed at the bottom of the insulation box, and a support rod is fixedly installed on the top of the base block;

[0007] The support rod comprises a positioning tube, a filter screen is fixedly installed on the top of the positioning tube, a sealing head is fixedly installed inside the positioning tube below the filter screen, and a circulation pipe is fixedly connected to the bottom of the sealing head.

[0008] In a preferred embodiment, the stirring device includes a first stirring motor, which is fixedly installed on the top of the heat preservation box, a cleaning rack is fixedly installed on the bottom of the first stirring motor, a cleaning brush is fixedly installed on the inner wall of the cleaning rack, a rotating shaft is fixedly installed on the bottom of the cleaning rack, a first stirring blade is fixedly sleeved on the outer surface of the rotating shaft, and the rotating shaft and the first stirring blade are rotatably installed inside the heat preservation box.

[0009] In a preferred embodiment, the rotating shaft is rotatably mounted on the outer surface of the support rod, the cleaning brush is rotatably mounted on the outer surface of the filter screen, and a scraper is fixedly sleeved on the bottom of the rotating shaft.

[0010] In a preferred embodiment, the side of the base block is an inclined surface, the scraper is rotatably mounted on the outer surface of the base block, one side of the bottom of the insulation box is fixedly connected to a discharge pipe, one end of the discharge pipe is located on one side of the insulation box and a solenoid valve is fixedly mounted, a fixed base is fixedly mounted on the bottom of the insulation box, and a circulation device is fixedly mounted inside the fixed base at the bottom of the insulation box.

[0011] In a preferred embodiment, the circulation device includes a fixed ring, a plurality of liquid outlets are fixedly installed on the top of the fixed ring, a circulation pump is fixedly installed inside the insulated box, a connecting block is fixedly installed on the top of the circulation pump, and a plurality of circulation branches are connected to the side of the connecting block.

[0012] In a preferred embodiment, the plurality of circulation branches are respectively connected to the liquid outlet, one side of the circulation pump is connected to the circulation pipe, the bottom of the insulation box is fixedly sleeved on the outer surface of the liquid outlet, and the liquid outlet is located at the bottom of the insulation box.

[0013] In a preferred embodiment, the base block comprises a heat exchange plate, a heating pipe is fixedly installed in the inner cavity of the heat exchange plate, a fixing hole is opened inside the heat exchange plate, and the fixing hole is fixedly sleeved on the outer surface of the circulation pipe.

[0014] In a preferred embodiment, the sub-mixing device includes a fixed box, a second stirring motor is fixedly installed on one side of the fixed box, the upper end of one side of the fixed box is fixedly connected to the discharge pipe, a liquid level sensor is fixedly installed on the upper end of the inner wall of the fixed box, one side of the second stirring motor is fixedly connected to a rotating frame, a second stirring blade is fixedly installed inside the rotating frame, and the lower end of the fixed box away from the second stirring motor is fixedly connected to a high-pressure water pump, and one side of the high-pressure water pump is connected to a connecting pipe.

[0015] In a preferred embodiment, one side of the second stirring blade is an inclined surface, and the second stirring blade is slidably mounted on the inner wall of the fixed box.

[0016] Technical effects and advantages of the present invention:

[0017] 1. The present invention provides a first stirring blade so that the first stirring blade stirs inside the insulation box, and the spray liquid inside the insulation box is mixed evenly. During the mixing process of the spray liquid, a circulation pump is provided so that the upper layer solution inside the insulation box passes through the circulation pipe and is sprayed out from the liquid outlet. During the process of the spray liquid circulating up and down, the precipitate at the bottom of the insulation box is flushed upward to make the precipitate float, thereby improving the mixing effect of the spray liquid and improving the mixing efficiency of the spray liquid.

[0018] 2. The present invention insulates the interior of the insulation box by making the insulation box itself of insulation material and arranging a temperature sensor inside the insulation box, so that the spray liquid inside the insulation box is at a suitable temperature, effectively improving the mixing efficiency of the spray liquid and reducing the generation of precipitation of the spray liquid.

[0019] 3. The present invention sets up an independent fixed box. Before waiting for the next mechanical part to arrive, the stirring device and the circulation device are in a stopped state. At this time, the fixed box controls the rotation of the second stirring blade to make the spray liquid always stirred inside the fixed box. When spraying the mechanical parts, the high-pressure water pump is started to make the spray device spray directly, reducing the time waiting for the spray liquid to be evenly stirred, and improving the uniformity and efficiency of the spraying of the spray device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the main mixing device of the present invention.

[0022] Figure 3 It is a schematic diagram of the structure of the stirring device of the present invention.

[0023] Figure 4 It is a schematic diagram of the internal structure of the main mixing device of the present invention.

[0024] Figure 5 It is a schematic diagram of the structure of location A of the present invention.

[0025] Figure 6 It is a schematic diagram of the internal structure of the base block of the present invention.

[0026] Figure 7 It is a schematic diagram of the structure of the circulation device of the present invention.

[0027] Figure 8 It is a schematic structural diagram of the secondary mixing device of the present invention.

[0028] The accompanying drawings are marked as follows: 1, base plate; 2, main mixing device; 3, auxiliary mixing device; 4, connecting pipe; 5, stirring device; 6, circulation device; 21, insulation box; 22, temperature sensor; 23, feed pipe; 24, solenoid valve; 25, discharge pipe; 26, base block; 27, support rod; 31, fixed box; 32, second stirring motor; 33, liquid level sensor; 34, rotating frame; 35, second stirring blade; 36, high-pressure water pump; 261, heat exchange plate; 262, fixing hole; 263, heating pipe; 271, positioning pipe; 272, filter screen; 273, sealing head; 274, circulation pipe; 51, first stirring motor; 52, cleaning frame; 53, cleaning brush; 54, rotating shaft; 55, first stirring blade; 56, scraper; 61, fixed ring; 62, liquid outlet; 63, circulation branch pipe; 64, circulation pump; 65, connecting block. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] First embodiment

[0031] As attached Figures 1 to 5 and Figure 7 In one embodiment of the present invention, a first stirring blade 55 is provided to stir the interior of the insulation box 21, so that the spray liquid inside the insulation box 21 is evenly mixed. During the mixing of the spray liquid, a circulation pump 64 is provided to allow the upper layer of solution inside the insulation box 21 to pass through the circulation pipe 274 and be sprayed out from the liquid outlet 62. During the upward and downward circulation of the spray liquid, the precipitate at the bottom of the insulation box 21 is flushed upward to float the precipitate, thereby improving the mixing effect of the spray liquid and improving the mixing efficiency of the spray liquid.

[0032] A mechanical parts spraying device for preventing precipitation comprises a base plate 1, a main mixing device 2 is fixedly installed at one end of the top of the base plate 1, a secondary mixing device 3 is fixedly installed on the side of the top of the base plate 1 away from the main mixing device 2, a connecting pipe 4 is fixedly connected to one side of the secondary mixing device 3, a high-pressure nozzle is connected to one end of the connecting pipe 4, and a stirring device 5 is arranged inside the main mixing device 2;

[0033] The main mixing device 2 includes an insulation box 21, a temperature sensor 22 is fixedly installed on the top of the inner wall of the insulation box 21, a feeding pipe 23 is fixedly connected to one side of the top of the insulation box 21, a discharge pipe 25 is fixedly connected to one side of the bottom of the insulation box 21, a solenoid valve 24 is fixedly installed at one end of the discharge pipe 25, a base block 26 is fixedly installed at the bottom of the insulation box 21, and a support rod 27 is fixedly installed on the top of the base block 26;

[0034] By setting the base block 26, which is in the shape of a truncated cone, when the sediment falls to the bottom of the insulation box 21, it slides to the bottom of the insulation box 21 through the action of the base block 26 and is concentrated and accumulated. Then, under the action of the liquid outlet 62, it is more conducive to the floating of the sediment.

[0035] The support rod 27 includes a positioning tube 271 , a filter screen 272 is fixedly installed on the top of the positioning tube 271 , a sealing head 273 is fixedly installed inside the positioning tube 271 below the filter screen 272 , and a circulation tube 274 is fixedly connected to the bottom of the sealing head 273 .

[0036] The solution entering the sealing head 273 is filtered through the filter 272 to prevent some large particles from settling into the sealing head 273 and clogging the liquid outlet 62 and the circulation pipe 274. At the same time, when the first stirring motor 51 controls the rotation of the rotating shaft 54, the cleaning brush 53 cleans the surface of the filter 272 to prevent the filter 272 from being blocked and affecting the flow efficiency of the spray liquid entering the sealing head 273.

[0037] like Figure 5 As shown, the stirring device 5 includes a first stirring motor 51, which is fixedly installed on the top of the heat preservation box 21, a cleaning rack 52 is fixedly installed at the bottom of the first stirring motor 51, a cleaning brush 53 is fixedly installed on the inner wall of the cleaning rack 52, a rotating shaft 54 ​​is fixedly installed at the bottom of the cleaning rack 52, and a first stirring blade 55 is fixedly sleeved on the outer surface of the rotating shaft 54, and the rotating shaft 54 ​​and the first stirring blade 55 are rotatably installed inside the heat preservation box 21.

[0038] The rotating shaft 54 ​​is rotatably mounted on the outer surface of the support rod 27 , the cleaning brush 53 is rotatably mounted on the outer surface of the filter screen 272 , and a scraper 56 is fixedly sleeved on the bottom of the rotating shaft 54 ​​.

[0039] While the first stirring motor 51 controls the rotation of the rotating shaft 54, the scraper 56 is used to accumulate the sediment at the bottom of the base block 26 and the insulation box 21, so that the scraper 56 pushes the sediment to move. When the sediment moves to the top of the liquid outlet 62, the liquid outlet 62 sprays the upper layer of solution from the lower layer and makes the sediment at the bottom float, which effectively improves the mixing effect of the spray liquid.

[0040] Among them, the side of the base block 26 is a slope, the scraper 56 is rotatably installed on the outer surface of the base block 26, one side of the bottom of the insulation box 21 is fixedly connected with a discharge pipe 25, one end of the discharge pipe 25 is located on one side of the insulation box 21 and a solenoid valve 24 is fixedly installed, the bottom of the insulation box 21 is fixedly installed with a fixed base, and the bottom of the insulation box 21 is located inside the fixed base and a circulation device 6 is fixedly installed.

[0041] like Figure 7 As shown, the circulation device 6 includes a fixed ring 61, a plurality of liquid outlets 62 are fixedly installed on the top of the fixed ring 61, a circulation pump 64 is fixedly installed inside the insulated box 21, a connecting block 65 is fixedly installed on the top of the circulation pump 64, and a plurality of circulation branches 63 are connected to the side of the connecting block 65.

[0042] Among them, multiple circulation branches 63 are respectively connected to the liquid outlet 62, one side of the circulation pump 64 is connected to the circulation pipe 274, the bottom of the insulation box 21 is fixedly sleeved on the outer surface of the liquid outlet 62, and the liquid outlet 62 is located at the bottom of the insulation box 21.

[0043] Second embodiment

[0044] like Figures 1 to 7 In one embodiment of the present invention, the insulation box 21 itself is made of insulation material, and a temperature sensor 22 is provided inside the insulation box 21 to insulate the interior of the insulation box 21, so that the spray liquid inside the insulation box 21 is at a suitable temperature, thereby effectively improving the mixing efficiency of the spray liquid and reducing the generation of precipitation of the spray liquid.

[0045] The second embodiment is further optimized relative to the first embodiment in that the base block 26 includes a heat exchange plate 261 , a heating pipe 263 is fixedly installed in the inner cavity of the heat exchange plate 261 , a fixing hole 262 is opened inside the heat exchange plate 261 , and the fixing hole 262 is fixedly sleeved on the outer surface of the circulation pipe 274 .

[0046] Third embodiment

[0047] like Figures 1 to 8As one embodiment of the present invention, an independent fixed box 31 is provided. Before waiting for the next mechanical part to arrive, the stirring device 5 and the circulation device 6 are in a stopped state. At this time, the fixed box 31 controls the rotation of the second stirring blade 35 to make the spray liquid always stirred inside the fixed box 31. When spraying the mechanical parts, the high-pressure water pump 36 is started to make the spray device directly spray, thereby reducing the time waiting for the spray liquid to be evenly stirred and improving the uniformity and efficiency of the spraying of the spray device.

[0048] The third embodiment is further optimized relative to the second embodiment in that the sub-mixing device 3 includes a fixed box 31, a second stirring motor 32 is fixedly installed on one side of the fixed box 31, the upper end of one side of the fixed box 31 is fixedly connected to the discharge pipe 25, a liquid level sensor 33 is fixedly installed on the upper end of the inner wall of the fixed box 31, a rotating frame 34 is fixedly connected to one side of the second stirring motor 32, a second stirring blade 35 is fixedly installed inside the rotating frame 34, and a high-pressure water pump 36 is fixedly connected to the lower end of the fixed box 31 away from the second stirring motor 32, and one side of the high-pressure water pump 36 is connected to the connecting pipe 4.

[0049] The capacity of the spraying liquid inside the fixed box 31 is detected by the liquid level sensor 33. When the capacity of the spraying liquid inside the fixed box 31 is low, the solenoid valve 24 is automatically controlled to open, so that the spraying liquid inside the insulation box 21 flows into the interior of the fixed box 31 through gravity, thereby realizing automatic filling of the interior of the fixed box 31.

[0050] One side of the second stirring blade 35 is an inclined surface, and the second stirring blade 35 is slidably mounted on the inner wall of the fixing box 31 .

[0051] Through the inclined surface of the second stirring blade 35, when the second stirring blade 35 rotates inside the fixed box 31, the second stirring blade 35 will push the sediment at the bottom of the fixed box 31 to float through the surface of the second stirring blade 35 under the push of the second stirring blade 35, thereby improving the mixing effect of the spray liquid.

[0052] Working principle of the present invention: the spraying liquid is put into the interior of the heat preservation box 21 through the feed pipe 23, the first stirring motor 51 controls the rotating shaft 54 ​​to rotate on the outer surface of the support rod 27, and the first stirring blade 55 stirs inside the heat preservation box 21, so that the spraying liquid inside the heat preservation box 21 is evenly mixed. In the process of mixing the spraying liquid, a circulation pump 64 is set to make the upper layer solution inside the heat preservation box 21 pass through the circulation pipe 274 and be sprayed out from the liquid outlet 62. In the process of realizing the up and down circulation of the spraying liquid, the scraper 56 accumulates the sediment at the bottom of the base block 26 and the heat preservation box 21, so that the scraper 56 pushes the sediment to move. When the sediment moves to the top of the liquid outlet 62, the liquid outlet 62 sprays the upper layer solution from the lower layer and makes the sediment at the bottom float, thereby effectively improving the mixing effect of the spraying liquid.

[0053] By setting the heat preservation box 21 itself to be a heat preservation material and setting a temperature sensor 22 inside the heat preservation box 21, the inside of the heat preservation box 21 is kept warm, so that the spraying liquid inside the heat preservation box 21 is at a suitable temperature;

[0054] An independent fixed box 31 is set up. Before waiting for the next mechanical part to arrive, the stirring device 5 and the circulation device 6 are in a stopped state. At this time, the fixed box 31 controls the second stirring blade 35 to rotate, so that the spraying liquid is always stirred inside the fixed box 31. When spraying the mechanical parts, the high-pressure water pump 36 is started to enable the spraying device to spray directly. The capacity of the spraying liquid inside the fixed box 31 is detected by the liquid level sensor 33. When the capacity of the spraying liquid inside the fixed box 31 is low, the solenoid valve 24 is automatically controlled to open, so that the spraying liquid inside the insulation box 21 flows into the interior of the fixed box 31 through gravity, thereby realizing automatic filling of the interior of the fixed box 31.

[0055] Finally, a few points should be explained: the drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A mechanical parts spraying device for preventing sedimentation, comprising a base plate (1), characterized in that: A main mixing device (2) is fixedly mounted on one end of the top of the base plate (1); a secondary mixing device (3) is fixedly mounted on a side of the top of the base plate (1) away from the main mixing device (2); a connecting pipe (4) is fixedly connected to one side of the secondary mixing device (3); a high-pressure nozzle is connected to one end of the connecting pipe (4); and a stirring device (5) is arranged inside the main mixing device (2); The main mixing device (2) comprises a heat preservation box (21), a temperature sensor (22) is fixedly mounted on the top of the inner wall of the heat preservation box (21), a feed pipe (23) is fixedly connected to one side of the top of the heat preservation box (21), a discharge pipe (25) is fixedly connected to one side of the bottom of the heat preservation box (21), a solenoid valve (24) is fixedly mounted on one end of the discharge pipe (25), a base block (26) is fixedly mounted on the bottom of the heat preservation box (21), and a support rod (27) is fixedly mounted on the top of the base block (26); The support rod (27) comprises a positioning tube (271), a filter screen (272) is fixedly mounted on the top of the positioning tube (271), a sealing head (273) is fixedly mounted inside the positioning tube (271) below the filter screen (272), and a circulation tube (274) is fixedly connected to the bottom of the sealing head (273); The stirring device (5) comprises a first stirring motor (51), the first stirring motor (51) being fixedly mounted on the top of the heat preservation box (21), a cleaning frame (52) being fixedly mounted on the bottom of the first stirring motor (51), a cleaning brush (53) being fixedly mounted on the inner wall of the cleaning frame (52), a rotating shaft (54) being fixedly mounted on the bottom of the cleaning frame (52), a first stirring blade (55) being fixedly sleeved on the outer surface of the rotating shaft (54), and the rotating shaft (54) and the first stirring blade (55) being rotatably mounted inside the heat preservation box (21); The rotating shaft (54) is rotatably mounted on the outer surface of the support rod (27), the cleaning brush (53) is rotatably mounted on the outer surface of the filter screen (272), and a scraper (56) is fixedly sleeved on the bottom of the rotating shaft (54); The side edge of the base block (26) is an inclined surface, the scraper (56) is rotatably mounted on the outer surface of the base block (26), one side of the bottom of the heat preservation box (21) is fixedly connected to a discharge pipe (25), one end of the discharge pipe (25) is located on one side of the heat preservation box (21) and a solenoid valve (24) is fixedly mounted thereon, a fixed base is fixedly mounted at the bottom of the heat preservation box (21), and a circulation device (6) is fixedly mounted inside the fixed base at the bottom of the heat preservation box (21); The circulation device (6) comprises a fixed ring (61), a plurality of liquid outlets (62) are fixedly mounted on the top of the fixed ring (61), a circulation pump (64) is fixedly mounted inside the heat preservation box (21), a connecting block (65) is fixedly mounted on the top of the circulation pump (64), and a plurality of circulation branch pipes (63) are connected to the side of the connecting block (65); The plurality of circulation branch pipes (63) are respectively connected to the liquid outlet (62); one side of the circulation pump (64) is connected to the circulation pipe (274); the bottom of the heat preservation box (21) is fixedly sleeved on the outer surface of the liquid outlet (62); and the liquid outlet (62) is located at the bottom of the heat preservation box (21).

2. The device for spraying mechanical parts to prevent sedimentation according to claim 1, characterized in that: The base block (26) comprises a heat exchange plate (261), the inner cavity of which is fixedly mounted a heating pipe (263), a fixing hole (262) is provided inside the heat exchange plate (261), and the fixing hole (262) is fixedly sleeved on the outer surface of the circulation pipe (274).

3. The device for spraying mechanical parts to prevent precipitation according to claim 1, characterized in that: The secondary mixing device (3) comprises a fixed box (31), a second stirring motor (32) is fixedly mounted on one side of the fixed box (31), an upper end of one side of the fixed box (31) is fixedly connected to a discharge pipe (25), a liquid level sensor (33) is fixedly mounted on the upper end of the inner wall of the fixed box (31), a rotating frame (34) is fixedly connected to one side of the second stirring motor (32), a second stirring blade (35) is fixedly mounted inside the rotating frame (34), and a high-pressure water pump (36) is fixedly connected to the lower end of the fixed box (31) away from the second stirring motor (32), and one side of the high-pressure water pump (36) is connected to the connecting pipe (4).

4. The device for spraying mechanical parts to prevent sedimentation according to claim 3, characterized in that: One side of the second stirring blade (35) is an inclined surface, and the second stirring blade (35) is slidably mounted on the inner wall of the fixed box (31).

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