Raw material crushing device for concrete production

Abstract

The invention discloses a raw material crushing device for concrete production, and relates to the technical field of crushing devices. The device comprises a machine body, and a mounting plate is mounted in the machine body. When a pressure sensor detects that the extrusion force of an L-shaped pressing plate and the force of gas in a copper box for extruding an L-shaped baffle reach certain numerical values, the gas in the L-shaped pressing plate and the gas in the copper box extrude the L-shaped baffle through a connecting rod and a through opening to open the through opening and contract the pressure sensor, and then the gas in a movable box is compressed by the L-shaped baffle; the gas extrudes the magnetic plate through the top opening to move upwards to be adsorbed by the magnetic block, at the moment, the magnetic plate prevents the stones from falling on the filter plate through the magnetic block, and then the L-shaped pressing plate can continuously crush the stones on the filter plate in a reciprocating manner until the stones are discharged through meshes of the filter plate after being crushed; by means of the design, the L-shaped pressing plate of the device is not prone to being damaged due to reciprocating movement extrusion caused by too many stones.

Description

Technical Field

[0001] The present invention relates to the technical field of crushing devices, and in particular to a raw material crushing device for concrete production. Background Art

[0002] Concrete is one of the most important civil engineering materials in contemporary times. It is an artificial stone made of cementitious materials, granular aggregates, water, and admixtures and additives added in a certain proportion, which is evenly mixed, densely formed, and cured and hardened.

[0003] A Chinese patent (application number: CN202121856148.7) discloses a crushing device for asphalt concrete production, which includes a crushing box, which has a cylindrical structure, a leak plate connected to the inside of the crushing box, and a through hole on the surface of the leak plate. The leak plate is used to screen materials; through the mutual cooperation between the rotating shaft, cam, limit groove, spring, and connecting rod limit block arranged on the outside of the leak plate, the crushed raw materials will not accumulate on the leak plate, which is conducive to the rapid entry of the raw materials into the through hole for discharge, which can improve work efficiency, and a sealing cover is installed on the feed pipe to prevent dust and other impurities from entering the crushing box through the feed pipe when the crushing box is working, which is conducive to improving production quality, and can prevent the raw materials from splashing out of the feed pipe during crushing, accidentally injuring staff, thereby improving safety.

[0004] This patent and the prior art have the following technical problems in actual use:

[0005] 1. When too much crushed raw materials accumulate on the filtering structure inside the device, if the crushed raw materials are not stopped from entering the device in time, the crushed raw materials inside the device will gradually increase, and then the extrusion mechanism of the device will easily become too large and damaged due to the excessive accumulation of stone materials when reciprocatingly extruding the crushed raw materials.

[0006] 2. At the same time, during the use of the device, the filter structure inside the device is often clogged due to the accumulation of crushed stone materials due to moisture and other reasons, thereby affecting the efficiency of the device in crushing concrete materials. Summary of the Invention

[0007] The purpose of the present invention is to solve the above problems and provide a raw material crushing device for concrete production.

[0008] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0009] A raw material crushing device for concrete production includes a body, a mounting plate is installed inside the body, a filter plate is fixed to the side of the mounting plate, the other end of the filter plate is in contact with the inner wall of the body, a copper box is fixed on the top of the mounting plate, a movable box is movably sleeved inside the copper box, a driving motor is installed at the bottom of the mounting plate, a cam located inside the movable box is installed at the other end of the output shaft of the driving motor, a pressure sensor is fixed inside the movable box, a through opening is opened at the right end of the movable box, an L-shaped baffle for closing the through opening is fixed to the other end of the pressure sensor, and the other end of the L-shaped baffle passes through the movable box and movably contacts the inner wall of the movable box The cam is connected to the filter plate by an L-shaped pressing plate, and the bottom of the L-shaped pressing plate is movably connected to the top of the filter plate. The top of the copper box is fixed with an inclined block in contact with the L-shaped pressing plate. The inside of the inclined block is movably connected with a magnetic plate. The inside of the copper box is provided with a top opening corresponding to the magnetic plate. The upper end of the machine body is provided with a discharge port. The inside of the upper end of the machine body is fixed with a magnetic block corresponding to the magnetic plate. A first one-way valve and a second one-way valve located at both ends of the cam are installed on the mounting plate. The first one-way valve opens to the outside of the copper box, and the second one-way valve opens to the inside of the copper box.

[0010] Furthermore, a second connecting pipe connected to the second one-way valve is fixed to the bottom of the mounting plate, an air intake pipe is fixedly connected to the second connecting pipe, and the other end of the air intake pipe is located above the filter plate.

[0011] Furthermore, there are two of the second one-way valve and two of the first one-way valve, and the two second one-way valves and the two first one-way valves are respectively located at the four ends of the mounting plate.

[0012] Furthermore, a first connecting pipe connected to the first one-way valve is installed at the bottom of the mounting plate, the first connecting pipe is fixedly connected to a bent pipe, the inside of the bent pipe is sleeved with a cannula, the other end of the cannula is fixedly connected to an injection block, the top of the injection block is movably connected to the bottom of the filter plate, friction plates are respectively fixed at both ends of the L-shaped pressure plate, the other end of the friction plate is fixedly connected to a connecting frame, and the other end of the connecting frame is fixedly connected to the injection block.

[0013] Furthermore, the friction plate includes a side plate fixed to the side of the L-shaped pressure plate, a slot is opened inside the side plate, a friction block is movably sleeved inside the slot, one end of the friction block is frictionally connected to the side of the copper box, and the other end of the friction block is fixed with a rigid spring, and the other end of the rigid spring is fixedly connected to the inner wall of the slot.

[0014] Furthermore, a roller box is placed at the lower end of the body, the outer surface of the roller box is tightly fitted with the inner wall of the body, and a filter port located below the filter plate is installed inside the body.

[0015] Furthermore, a push rod is sleeved inside the magnetic block, the lower end of the push rod extends to the outside of the magnetic block, and the upper end of the push rod passes through the body and is fixedly connected to a pressing block.

[0016] Furthermore, a side port communicating with the air injection block is opened inside the machine body, and the lower end of the side port is located below the air injection block.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. When the pressure sensor of the present invention detects that the extrusion force of the L-shaped pressure plate and the force of the gas inside the copper box squeezing the L-shaped baffle reach a certain value, the L-shaped pressure plate and the gas inside the copper box squeeze the L-shaped baffle through the connecting rod and the through port respectively to open the through port and contract the pressure sensor, thereby causing the L-shaped baffle to compress the gas inside the movable box, and causing the gas to squeeze the magnetic plate upward through the top port and be adsorbed by the magnetic block. At this time, the magnetic plate blocks the stones from falling on the filter plate through the magnetic block, and then the L-shaped pressure plate can continue to reciprocate and crush the stones on the filter plate until the stones are crushed and discharged through the mesh of the filter plate and stop. Such a design makes it difficult for the L-shaped pressure plate of the device to be damaged by reciprocating movement and squeezing due to too many stones.

[0019] 2. The present invention starts the driving motor so that the cam drives the movable box to move back and forth, which will cause the movable box to drive the L-shaped pressure plate to reciprocate and crush the stones through the pressure sensor, the through port and the connecting rod, and then the L-shaped pressure plate drives the friction plate to reciprocate and rub the copper box, so that the friction block rubs the outer surface of the copper box and generates heat. At this time, the movable box circulates the gas inside the body into the copper box through the second one-way valve and the first one-way valve, so that the heat can heat the gas inside the copper box, and then the heated gas can be evenly sprayed onto the filter plate through the reciprocating jet block to dry the wet stones, thereby preventing the wet stones from being blocked on the filter plate due to their strong adhesion.

[0020] 3. The present invention starts the driving motor so that the cam drives the movable box to move back and forth, and the movable box reciprocates to absorb external air through the second one-way valve, the second connecting pipe and the suction pipe, so that the suction pipe can absorb the dust generated when the L-shaped pressure plate crushes the stones on the filter plate, and introduce the dust into the interior of the copper box, and then the movable box can absorb external air through the two second one-way valves alternately opened, and then discharge it through the two first one-way valves alternately opened. At this time, the movable box can reciprocate so that the second connecting pipe and the suction pipe can always absorb the stone dust inside the machine body, thereby avoiding the stone dust from being discharged from the discharge port to cause dust pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the present invention;

[0022] Figure 2 It is a side cross-sectional schematic diagram of the body of the present invention;

[0023] Figure 3 is a bottom view schematic diagram of the mounting plate and the filter plate of the present invention;

[0024] Figure 4 is a side cross-sectional schematic diagram of the mounting plate and the filter plate of the present invention;

[0025] Figure 5 It is a cross-sectional schematic diagram of the mounting plate and the first connecting pipe and the second connecting pipe of the present invention;

[0026] Figure 6 is a schematic diagram of a friction plate of the present invention;

[0027] Figure 7 This invention Figure 2 A partial enlarged schematic diagram of point A in the middle.

[0028] Figure numerals: 1. body; 2. mounting plate; 3. filter plate; 4. copper box; 5. drive motor; 6. cam; 7. movable box; 8. pressure sensor; 9. L-shaped baffle; 10. connecting rod; 11. through port; 12. L-shaped pressure plate; 13. magnetic block; 14. top port; 15. magnetic plate; 16. tilting block; 17. first one-way valve; 18. first connecting pipe; 19. elbow; 20. insert pipe; 21. jet block; 22. friction plate; 2201. side plate; 2202. notch; 2203. rigid spring; 2204. friction block; 23. connecting frame; 24. second one-way valve; 25. second connecting pipe; 26. suction pipe; 27. discharge port; 28. roller box; 29. ​​filter port; 30. push rod; 31. pressing block; 32. side port. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] Example 1, as Figure 1-Figure 7 As shown, a raw material crushing device for concrete production includes a body 1, a mounting plate 2 is installed inside the body 1, a filter plate 3 is fixed to the side of the mounting plate 2, the other end of the filter plate 3 is in contact with the inner wall of the body 1, a copper box 4 is fixed on the top of the mounting plate 2, a movable box 7 is movably sleeved inside the copper box 4, a driving motor 5 is installed at the bottom of the mounting plate 2, a cam 6 located inside the movable box 7 is installed at the other end of the output shaft of the driving motor 5, a pressure sensor 8 is fixed inside the movable box 7, a through opening 11 is opened at the right end of the movable box 7, an L-shaped baffle 9 for closing the through opening 11 is fixed to the other end of the pressure sensor 8, the other end of the L-shaped baffle 9 passes through the movable box 7 and is movably sleeved with the inner wall of the movable box 7, and the through opening 11 A connecting rod 10 is fixed to the side, and the other end of the connecting rod 10 passes through the through-port 11 and the copper box 4 in sequence and is fixedly connected to an L-shaped pressure plate 12. The bottom of the L-shaped pressure plate 12 is movably connected to the top of the filter plate 3. A tilting block 16 in contact with the L-shaped pressure plate 12 is fixed to the top of the copper box 4. The internal movably sleeve of the tilting block 16 is provided with a magnetic plate 15. A top port 14 corresponding to the magnetic plate 15 is provided inside the copper box 4. A discharge port 27 is provided at the upper end of the body 1. A magnetic block 13 corresponding to the magnetic plate 15 is fixed inside the upper end of the body 1. A first one-way valve 17 and a second one-way valve 24 located at both ends of the cam 6 are installed on the mounting plate 2. The first one-way valve 17 opens to the outside of the copper box 4, and the second one-way valve 24 opens to the inside of the copper box 4.

[0031] The concrete raw material stones are introduced into the body 1 through the discharge port 27, and then the stones fall onto the filter plate 3 through the inclined block 16, and then the driving motor 5 is started, so that the cam 6 drives the movable box 7 to move back and forth, and the movable box 7 reciprocates to compress the gas inside the copper box 4, so that the gas inside the copper box 4 is discharged through the first one-way valve 17, and the external gas re-enters the copper box 4 through the second one-way valve 24, and then the pressure sensor 8 drives the L-shaped pressure plate 12 to move back and forth through the through port 11 and the connecting rod 10 to squeeze and crush the stones on the filter plate 3. When the pressure sensor 8 detects that the extrusion force of the L-shaped pressure plate 12 and the force of the gas inside the copper box 4 squeezing the L-shaped baffle 9 reach a certain value, the pressure value at this time is the capacity of the L-shaped pressure plate 12. The value that is easy to be squeezed and damaged is lowered, otherwise the pressure sensor 8 will be reset, and then the gas inside the L-shaped pressure plate 12 and the copper box 4 will be squeezed by the connecting rod 10 and the through port 11 respectively. The L-shaped baffle 9 opens the through port 11 and contracts the pressure sensor 8, thereby causing the L-shaped baffle 9 to compress the gas inside the movable box 7, and causes the gas to squeeze the magnetic plate 15 through the top port 14 and move upward to be adsorbed by the magnetic block 13. At this time, the magnetic plate 15 blocks the stone from falling on the filter plate 3 through the magnetic block 13, and then the L-shaped pressure plate 12 can continue to reciprocate and crush the stone on the filter plate 3 until the stone is crushed and discharged through the mesh of the filter plate 3. This design makes it difficult for the L-shaped pressure plate 12 of the device to be squeezed and damaged by reciprocating movement due to too many stones.

[0032] Example 2, as Figure 2-Figure 5 As shown, on the basis of the above embodiment, a second connecting pipe 25 connected to the second one-way valve 24 is fixed to the bottom of the mounting plate 2, and an air intake pipe 26 is fixedly connected to the second connecting pipe 25. The other end of the air intake pipe 26 is located above the filter plate 3. There are two second one-way valves 24 and two first one-way valves 17, and the two second one-way valves 24 and the two first one-way valves 17 are respectively located at the four ends of the mounting plate 2.

[0033] By starting the drive motor 5, the cam 6 drives the movable box 7 to move back and forth, and the movable box 7 reciprocates to absorb external air through the second one-way valve 24, the second connecting pipe 25 and the suction pipe 26. At this time, since the suction pipe 26 is located above the filter plate 3, the suction pipe 26 can absorb the dust generated when the L-shaped pressure plate 12 crushes the stones on the filter plate 3, and introduce the dust into the copper box 4. At this time, since there are two second one-way valves 24 and two first one-way valves 17, and the two second one-way valves 24 and the first one-way valve 17 are respectively located at the four ends of the mounting plate 2, the movable box 7 can absorb external air through the two second one-way valves 24 alternately opened, and then discharge it through the two first one-way valves 17 alternately opened. With this design, the movable box 7 can continuously absorb stone dust inside the body 1 through the reciprocating second connecting pipe 25 and the suction pipe 26, thereby preventing stone dust from being discharged from the discharge port 27 to cause dust pollution.

[0034] Example 3, as Figure 3-Figure 5 As shown, on the basis of the above embodiment, a first connecting pipe 18 connected to the first one-way valve 17 is installed at the bottom of the mounting plate 2, and a bend pipe 19 is fixedly connected to the first connecting pipe 18. The inner part of the bend pipe 19 is sleeved with a cannula 20, and the other end of the cannula 20 is fixedly connected to an injection block 21. The top of the injection block 21 is movably connected to the bottom of the filter plate 3, and friction plates 22 are respectively fixed at both ends of the L-shaped pressure plate 12. The other end of the friction plate 22 is fixedly connected to a connecting frame 23, and the other end of the connecting frame 23 is fixedly connected to the injection block 21.

[0035] By starting the drive motor 5, the cam 6 drives the movable box 7 to move back and forth, so that the second one-way valve 24 is alternately opened by negative pressure to absorb external gas, and then the movable box 7 squeezes the first one-way valve 17 to open alternately to discharge the gas inside the copper box 4, and the discharged gas enters the jet block 21 through the first connecting pipe 18, the elbow 19 and the insert pipe 20 in turn and is ejected. At the same time, the movable box 7 will drive the L-shaped pressure plate 12 to reciprocate and crush the stone through the pressure sensor 8, the port 11 and the connecting rod 10, and then the L-shaped pressure plate 12 drives the jet block 21 to reciprocate along the bottom of the filter plate 3 through the friction plate 22 and the connecting frame 23, so that the jet block 21 can reciprocally spray gas to the blocked holes of the filter plate 3 to prevent the filter plate 3 from being blocked.

[0036] Example 4, as Figure 6As shown, on the basis of the above embodiment, the friction plate 22 includes a side plate 2201 fixed to the side of the L-shaped pressure plate 12, a slot 2202 is opened inside the side plate 2201, a friction block 2204 is movably sleeved inside the slot 2202, one end of the friction block 2204 is frictionally connected to the side of the copper box 4, and the other end of the friction block 2204 is fixed with a rigid spring 2203, and the other end of the rigid spring 2203 is fixedly connected to the inner wall of the slot 2202.

[0037] By starting the drive motor 5, the cam 6 drives the movable box 7 to move back and forth, which will cause the movable box 7 to drive the L-shaped pressure plate 12 to reciprocate and crush the stones through the pressure sensor 8, the port 11 and the connecting rod 10, and then the L-shaped pressure plate 12 drives the friction plate 22 to move back and forth to rub the copper box 4, so that the friction block 2204 reciprocates and rubs the outer surface of the copper box 4 and generates heat. At this time, the movable box 7 circulates the gas inside the body 1 into the copper box 4 through the second one-way valve 24 and the first one-way valve 17, so that the heat can heat the gas inside the copper box 4, and then the heated gas can be evenly sprayed onto the filter plate 3 through the reciprocating jet block 21. At this time, if the stones on the filter plate 3 are wet due to weather or other reasons, the hot air sprayed by the jet block 21 can dry the stones to prevent the wet stones from being blocked on the filter plate 3 due to excessive adhesion.

[0038] Example 5, as Figure 1 As shown, based on the above embodiment, a roller box 28 is placed at the lower end of the body 1, the outer surface of the roller box 28 is tightly fitted with the inner wall of the body 1, and a filter port 29 located below the filter plate 3 is installed inside the body 1.

[0039] Through the design of the filter port 29 and the roller box 28, when the L-shaped pressure plate 12 reciprocates to crush the stones on the filter plate 3, the stones crushed by the filter plate 3 will fall into the roller box 28 for collection. At the same time, since the roller box 28 fits tightly against the inner wall of the body 1, the stone dust inside the body 1 will not be discharged from the lower end of the body 1, but will be filtered out through the filter port 29 before being discharged, thus preventing the stone dust from being discharged into the air and causing dust pollution.

[0040] Example 6: Figure 2 As shown, based on the above embodiment, a push rod 30 is sleeved inside the magnetic block 13, the lower end of the push rod 30 extends to the outside of the magnetic block 13, and the upper end of the push rod 30 passes through the body 1 and is fixedly connected to a pressing block 31.

[0041] When the magnetic plate 15 moves upward and is adsorbed together with the magnetic block 13 to block the stones, the magnetic plate 15 will lift the push rod 30. Then, when the L-shaped pressure plate 12 crushes the stones on the filter plate 3, the operator presses the pressing block 31, which will cause the push rod 30 to squeeze the magnetic plate 15 out of the magnetic block 13, so that the magnetic plate 15 falls into the inside of the tilting block 16 to release the obstruction to the stones, and then the stones can pass through the tilting block 16 and fall into the filter plate 3 to be squeezed and crushed by the L-shaped pressure plate 12.

[0042] Example 7, as Figure 7 As shown, based on the above embodiment, a side port 32 communicating with the air injection block 21 is opened inside the body 1 , and the lower end of the side port 32 is located below the air injection block 21 .

[0043] Through the design of the side opening 32 and the air injection block 21, when crushed concrete raw materials fall into the air injection block 21 and the air injection block 21 corresponds to the side opening 32, the gas inside the air injection block 21 will eject the crushed concrete raw materials inside the air injection block 21 through the side opening 32, thereby preventing the crushed concrete raw materials from accumulating inside the air injection block 21 and affecting the gas circulation.

[0044] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A raw material crushing device for concrete production, comprising a body (1), characterized in that: A mounting plate (2) is installed inside the body (1), a filter plate (3) is fixed on the side of the mounting plate (2), the other end of the filter plate (3) contacts the inner wall of the body (1), a copper box (4) is fixed on the top of the mounting plate (2), a movable box (7) is movably sleeved inside the copper box (4), a driving motor (5) is installed on the bottom of the mounting plate (2), a cam (6) located inside the movable box (7) is installed on the other end of the output shaft of the driving motor (5), a pressure sensor (8) is fixed inside the movable box (7), a through opening (11) is opened at the right end of the movable box (7), an L-shaped baffle (9) that closes the through opening (11) is fixed to the other end of the pressure sensor (8), the other end of the L-shaped baffle (9) passes through the movable box (7) and is movably sleeved with the inner wall of the movable box (7), and a connecting rod (10) is fixed on the side of the through opening (11) The other end of the connecting rod (10) passes through the through port (11) and the copper box (4) in sequence and is fixedly connected to an L-shaped pressing plate (12). The bottom of the L-shaped pressing plate (12) is movably connected to the top of the filter plate (3). The top of the copper box (4) is fixed with an inclined block (16) in contact with the L-shaped pressing plate (12). The interior of the inclined block (16) is movably sleeved with a magnetic plate (15). The interior of the copper box (4) is provided with a magnetic plate (15) in contact with the magnetic plate (15). 5) corresponding to the top opening (14), the upper end of the body (1) is provided with a discharge port (27), the upper end of the body (1) is fixed with a magnetic block (13) corresponding to the magnetic plate (15), the mounting plate (2) is provided with a first one-way valve (17) and a second one-way valve (24) located at both ends of the cam (6), the first one-way valve (17) opens outward from the copper box (4), and the second one-way valve (24) opens inward from the copper box (4).

2. A raw material crushing device for concrete production according to claim 1, characterized in that: A second connecting pipe (25) communicating with a second one-way valve (24) is fixed to the bottom of the mounting plate (2), and an air intake pipe (26) is fixedly connected to the second connecting pipe (25), with the other end of the air intake pipe (26) being located above the filter plate (3).

3. A raw material crushing device for concrete production according to claim 1, characterized in that: There are two of each of the second one-way valve (24) and the first one-way valve (17), and the two second one-way valves (24) and the two first one-way valves (17) are respectively located at the four ends of the mounting plate (2).

4. A raw material crushing device for concrete production according to claim 1, characterized in that: A first connecting pipe (18) connected to a first one-way valve (17) is installed at the bottom of the mounting plate (2); a bend pipe (19) is fixedly connected to the first connecting pipe (18); a plug pipe (20) is sleeved inside the bend pipe (19); the other end of the plug pipe (20) is fixedly connected to an injection block (21); the top of the injection block (21) is movably connected to the bottom of the filter plate (3); friction plates (22) are fixed to both ends of the L-shaped pressure plate (12); the other end of the friction plate (22) is fixedly connected to a connecting frame (23); the other end of the connecting frame (23) is fixedly connected to the injection block (21).

5. A raw material crushing device for concrete production according to claim 4, characterized in that: The friction plate (22) includes a side plate (2201) fixed to the side of the L-shaped pressure plate (12), a notch (2202) is provided inside the side plate (2201), a friction block (2204) is movably sleeved inside the notch (2202), one end of the friction block (2204) is frictionally connected to the side of the copper box (4), and the other end of the friction block (2204) is fixed with a rigid spring (2203), and the other end of the rigid spring (2203) is fixedly connected to the inner wall of the notch (2202).

6. The raw material crushing device for concrete production according to claim 1, characterized in that: A roller box (28) is placed at the lower end of the body (1), the outer surface of the roller box (28) is tightly fitted with the inner wall of the body (1), and a filter port (29) located below the filter plate (3) is installed inside the body (1).

7. The raw material crushing device for concrete production according to claim 1, characterized in that: A push rod (30) is sleeved inside the magnetic block (13), the lower end of the push rod (30) extends to the outside of the magnetic block (13), and the upper end of the push rod (30) passes through the body (1) and is fixedly connected to a pressing block (31).

8. The raw material crushing device for concrete production according to claim 4, characterized in that: A side port (32) communicating with the air injection block (21) is provided inside the machine body (1), and the lower end of the side port (32) is located below the air injection block (21).

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