Efficient and energy-saving dry-mixed mortar drying device

Abstract

The utility model discloses an efficient and energy-saving dry-mixed mortar drying device, which relates to the technical field of dry-mixed mortar production equipment, and comprises a device shell, the top of the device shell is fixedly connected with a feed pipe, the bottom of the device shell is fixedly connected with a discharge pipe, the outer wall of the discharge pipe is fixedly connected with an electromagnetic valve, and the electromagnetic valve is fixedly connected with a motor. Coaxial bidirectional stirring assemblies are arranged in the device shell and on the top of the device shell, and two wide-angle drying assemblies which are symmetrical left and right are arranged on the inner top of the device shell. By means of the coaxial bidirectional stirring assembly, dry-mixed mortar can be stirred in different directions, the situation of stirring dead angles is avoided, the working efficiency of the whole drying device is improved, hot air blown out of a fan cover is not fixed in one direction through the wide-angle drying assembly, and therefore the drying effect is improved. Instead, a plurality of different angles and areas in the device can be covered, the drying coverage range is increased, and the consistency and integrity of the drying effect are guaranteed.

Description

Technical Field

[0001] This utility model relates to the technical field of dry-mixed mortar production equipment, specifically to a high-efficiency and energy-saving dry-mixed mortar drying device. Background Technology

[0002] Dry-mixed mortar refers to a granular or powdery material made by physically mixing dried and screened aggregates, inorganic cementitious materials, and additives in a certain proportion. It is transported to the construction site in bagged or bulk form and can be used directly after being mixed with water. It is also known as dry mortar powder, dry-mixed mortar, or dry-mix powder. Some building adhesives also belong to this category. Dry-mixed mortar plays a crucial role in the construction industry by providing thin layers for bonding, padding, protection, and decoration, and its application in construction and decoration projects is extremely widespread. However, the existing technology has the following problems:

[0003] Existing dry-mixed mortar drying equipment lacks a coaxial bidirectional mixing component and only uses a unidirectional mixing method, which easily leads to uneven mixing. Due to uneven mixing, the mortar is in a lumpy or locally accumulated state, and the internal moisture cannot be fully exposed to the surface to exchange heat with the hot air. This greatly prolongs the drying time and reduces the overall working efficiency of the drying equipment. In addition, existing equipment lacks a wide-angle drying component, and the drying equipment can only blow hot air in a fixed direction, which greatly reduces the drying coverage area and cannot fully cover the dry-mixed mortar inside the equipment, resulting in uneven drying. Utility Model Content

[0004] This invention provides a high-efficiency and energy-saving dry mortar drying device to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A high-efficiency and energy-saving dry-mixed mortar drying device includes a device shell. Four fixed plates arranged in a circular array are fixedly connected to the bottom of the outer wall of the device shell. Each of the four fixed plates is fixedly connected to a support leg. A feed pipe is fixedly connected to the top of the device shell. A discharge pipe is fixedly connected to the bottom of the device shell. A solenoid valve is fixedly connected to the outer wall of the discharge pipe. A coaxial bidirectional stirring assembly is provided inside and at the top of the device shell. Two wide-angle drying assemblies that are symmetrically arranged on the inner top of the device shell are provided.

[0007] A further improvement of the present invention is that the coaxial bidirectional stirring assembly includes two side plates. The bottom of the two side plates is fixedly connected to the top of the device housing. A rotating shaft is rotatably connected to the opposite surfaces of the two side plates. A motor is fixedly connected to the right side wall of the right side plate. The output end of the motor passes through the left side wall of the right side plate and is fixedly connected to the rotating shaft. Helical gears are fixedly connected to both sides of the outer wall of the rotating shaft. Helical gears are meshed with the front sides of the two helical gears.

[0008] A further improvement of this utility model is that: the inner wall of the right-side helical gear two is fixedly connected to a rotating column that is rotatably connected to the top of the device housing; the bottom of the outer wall of the rotating column is fixedly connected to a gear one; the left side of the gear one is meshed with a gear two; the inner wall of the gear two is fixedly connected to a hollow rotating rod that is rotatably connected to the top of the device housing; a rotating rod is rotatably connected inside the hollow rotating rod; the inner wall of the left-side helical gear two is fixedly connected to the top of the outer wall of the rotating rod; the bottom of the hollow rotating rod penetrates into the interior of the device housing; and the bottom of the rotating rod penetrates the bottom of the hollow rotating rod and extends into the interior of the device housing.

[0009] A further improvement of this utility model is that: two symmetrical rotating frames are fixedly connected to the bottom of the outer wall of the hollow rotating rod; several stirring crossbars are fixedly connected to the opposite surfaces of the two rotating frames; four electric telescopic rods are fixedly connected to the sides of the two rotating frames that are far apart from each other; a scraper is fixedly connected to the end of the four electric telescopic rods that is far away from the rotating frame; several stirring crossbars are fixedly connected to the outer wall of the rotating rod; and the several stirring crossbars are staggered with the several stirring crossbars.

[0010] A further improvement of the present invention is that: the wide-angle drying component includes a top plate, which is fixedly connected to the inner top wall of the device housing; a second motor is fixedly connected to the bottom of the top plate; a fixed frame is fixedly connected to the left and right sides of the outer wall of the second motor; a connecting crank is fixedly connected to the output end of the second motor; a connecting shaft is rotatably connected to the end of the connecting crank away from the second motor; a swing frame is rotatably connected to the inner walls of the left and right sides of the fixed frame; a swing motor is rotatably connected to the inner walls of the front and rear sides of the swing frame; and the top of the swing motor is fixedly connected to the connecting shaft.

[0011] A further improvement of this utility model is that: a hollow rotating column is fixedly connected to the bottom of the swing motor, a fan cover is fixedly connected to the bottom of the hollow rotating column, a fixed column is fixedly connected to the inner bottom wall of the fan cover, four heating rods arranged in a ring array are fixedly connected to the outer wall of the fixed column, the output end of the swing motor passes through the inside of the fan cover and is fixedly connected to a fan blade, and the outer wall of the output shaft of the swing motor is rotatably connected to the hollow rotating column and the fan cover respectively.

[0012] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0013] 1. This utility model provides a high-efficiency and energy-saving dry mortar drying device. Through the set coaxial bidirectional stirring component, the dry mortar can be stirred from different directions, avoiding the occurrence of stirring dead corners, allowing the various components in the mortar to be fully mixed, ensuring the overall uniformity of the dry mortar, and allowing the internal moisture to be better exposed on the surface, thereby shortening the overall drying time and improving the working efficiency of the entire drying device.

[0014] 2. This utility model provides a high-efficiency and energy-saving dry-mixed mortar drying device. By setting a wide-angle drying component, the hot air blown out from the fan cover is not fixed in one direction, but can cover multiple different angles and areas inside the device, which greatly increases the drying coverage and avoids the situation of local incomplete drying. This ensures that the dry-mixed mortar can be dried relatively evenly throughout the device, guaranteeing the consistency and integrity of the drying effect and further accelerating the working efficiency of the device. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0017] Figure 3 This is a schematic diagram of the coaxial bidirectional stirring assembly of this utility model;

[0018] Figure 4 This is another schematic diagram of the coaxial bidirectional stirring assembly of this utility model;

[0019] Figure 5 This is a schematic diagram of the wide-angle drying component structure of this utility model;

[0020] Figure 6 This is another schematic diagram of the wide-angle drying component structure of this utility model.

[0021] In the diagram: 10. Device casing; 11. Fixing plate; 12. Support leg; 13. Feed pipe; 14. Solenoid valve; 2. Coaxial bidirectional stirring assembly; 20. Side plate; 21. Motor 1; 22. Rotating shaft; 23. Helical gear 1; 24. Helical gear 2; 25. Rotating column; 26. Gear 1; 28. Rotating rod; 29. ​​Hollow rotating rod; 290. Gear 2; 291. Rotating frame; 292. Stirring crossbar 1; 293. Stirring crossbar 2; 294. Electric telescopic rod; 295. Scraper; 3. Wide-angle drying assembly; 30. Top plate; 31. Motor 2; 32. Fixing frame; 33. Connecting crank; 34. Connecting shaft; 35. Oscillating motor; 36. Oscillating frame; 37. Hollow rotating column; 38. Fan cover; 39. Fixing column; 390. Heating rod; 391. Fan blade. Detailed Implementation

[0022] To make the technical means, creative features, objectives, and effects of this utility model easier to understand, the following describes this utility model in conjunction with specific embodiments:

[0023] like Figure 1 , Figure 2 As shown, this utility model provides a high-efficiency and energy-saving dry mortar drying device, including a device shell 10. Four fixed plates 11 arranged in a ring array are fixedly connected to the bottom of the outer wall of the device shell 10. Support legs 12 are fixedly connected to the bottom of each of the four fixed plates 11. A feed pipe 13 is fixedly connected to the top of the device shell 10. A discharge pipe is fixedly connected to the bottom of the device shell 10. A solenoid valve 14 is fixedly connected to the outer wall of the discharge pipe. A coaxial bidirectional stirring assembly 2 is provided inside and at the top of the device shell 10. Two left-right symmetrical wide-angle drying assemblies 3 are provided at the inner top of the device shell 10.

[0024] The outer casing 10 of the device is made of high-quality metal materials such as stainless steel. Its shape is roughly cylindrical, which can effectively accommodate dry-mixed mortar and internal components. The four fixed plates 11 are fixed to the bottom by bolts and the support legs 12 can ensure that the entire device can be placed stably on the ground. The feed pipe 13 facilitates the entry of dry-mixed mortar into the inner casing 10 of the device. The solenoid valve 14 can accurately control the opening and closing of the discharge, which is convenient to control the discharge of dry-mixed mortar according to the actual production rhythm.

[0025] like Figure 3 , Figure 4As shown, the coaxial bidirectional stirring assembly 2 includes two side plates 20. The bottom of the left and right side plates 20 is fixedly connected to the top of the device housing 10. The opposite surfaces of the left and right side plates 20 are rotatably connected to a rotating shaft 22. The right side wall of the right side plate 20 is fixedly connected to a motor 21. The output end of the motor 21 passes through to the left side wall of the right side plate 20 and is fixedly connected to the rotating shaft 22. The outer walls of the rotating shaft 22 are fixedly connected to the left and right sides of the left and right sides, and the front sides of the left and right helical gears 23 are meshed with helical gears 24.

[0026] like Figure 3 , Figure 4 As shown, a rotating column 25, which is rotatably connected to the top of the device housing 10, is fixedly connected to the inner wall of the right helical gear 24. A gear 26 is fixedly connected to the bottom of the outer wall of the rotating column 25. A gear 290 is meshed with the left side of the gear 26. A hollow rotating rod 29, which is rotatably connected to the top of the device housing 10, is fixedly connected to the inner wall of the gear 290. A rotating rod 28 is rotatably connected inside the hollow rotating rod 29. The inner wall of the left helical gear 24 is fixedly connected to the top of the outer wall of the rotating rod 28. The bottom of the hollow rotating rod 29 extends into the interior of the device housing 10. The bottom of the rotating rod 28 extends into the interior of the hollow rotating rod 29.

[0027] like Figure 3 , Figure 4 As shown, two symmetrical rotating frames 291 are fixedly connected to the bottom of the outer wall of the hollow rotating rod 29. Several stirring crossbars 292 with equal vertical spacing are fixedly connected to the opposite sides of the two rotating frames 291. Four electric telescopic rods 294 with equal vertical spacing are fixedly connected to the side of the two rotating frames 291 that is far away from each other. A scraper 295 is fixedly connected to the end of the four electric telescopic rods 294 that is far away from the rotating frame 291. Several stirring crossbars 293 with equal vertical spacing are fixedly connected to the outer wall of the rotating rod 28. The stirring crossbars 293 and the stirring crossbars 292 are arranged alternately.

[0028] When mixing dry-mixed mortar is required, the dry-mixed mortar first enters the device housing 10 through the feed pipe 13. Then, the motor 21 is started after being powered on. The output end of the motor 21 drives the rotating shaft 22 to rotate. When the rotating shaft 22 rotates, the two helical gears 23 rotate synchronously.

[0029] When the two helical gears 23 rotate, they drive the two helical gears 24 to rotate. The right helical gear 24 drives the rotating column 25 connected to it to rotate, and the gear 26 on the rotating column 25 rotates accordingly. Gear 26 meshes with gear 290, causing gear 290 to rotate, which in turn drives the hollow rotating rod 29 to rotate. The rotation of the hollow rotating rod 29 drives the rotating frame 291 fixedly connected to it. Several stirring crossbars 292 on the rotating frame 291 move in a circular motion with the rotation of the hollow rotating rod 29, stirring the dry mortar in the device. At the same time, the left helical gear 24 drives the rotating rod 28 to rotate, and several stirring crossbars 293 fixedly connected to the outer wall of the rotating rod 28 also stir with the rotation of the rotating rod 28. The mixing crossbar 292 is staggered vertically with the mixing crossbar 292. This ensures thorough and comprehensive mixing of the dry-mixed mortar during their counter-rotating mixing process, preventing localized accumulation or inadequate mixing. This allows the mortar to be evenly dispersed within the device, facilitating subsequent drying. Furthermore, the electric telescopic rod 294 can extend and retract as needed, moving the scraper 295 to clean the inner wall of the device casing 10. The coaxial bidirectional mixing component 2 allows for mixing of the dry-mixed mortar from different directions, avoiding dead zones and ensuring thorough mixing of all components. This guarantees the overall uniformity of the dry-mixed mortar, allowing internal moisture to be better exposed on the surface, thus shortening the overall drying time and improving the efficiency of the entire drying device.

[0030] like Figure 5 , Figure 6 As shown, the wide-angle drying assembly 3 includes a top plate 30, which is fixedly connected to the inner top wall of the device housing 10. A second motor 31 is fixedly connected to the bottom of the top plate 30. Fixed frames 32 are fixedly connected to the left and right sides of the outer wall of the second motor 31. A connecting crank 33 is fixedly connected to the output end of the second motor 31. A connecting shaft 34 is rotatably connected to the end of the connecting crank 33 away from the second motor 31. A swing frame 36 is rotatably connected to the inner walls of the left and right sides of the fixed frame 32. A swing motor 35 is rotatably connected to the inner walls of the front and rear sides of the swing frame 36. The top of the swing motor 35 is fixedly connected to the connecting shaft 34.

[0031] like Figure 5 , Figure 6 As shown, a hollow rotating column 37 is fixedly connected to the bottom of the swing motor 35, a fan cover 38 is fixedly connected to the bottom of the hollow rotating column 37, a fixed column 39 is fixedly connected to the inner bottom wall of the fan cover 38, and four heating rods 390 arranged in a ring array are fixedly connected to the outer wall of the fixed column 39. The output end of the swing motor 35 passes through the interior of the fan cover 38 and is fixedly connected to the fan blades 391. The outer wall of the output shaft of the swing motor 35 is rotatably connected to the hollow rotating column 37 and the fan cover 38 respectively.

[0032] When the dry-mixed mortar needs to be dried, motor 31 starts, and its output drives the connecting crank 33 to rotate. The connecting crank 33 drives the swing motor 35 to swing within the fixed frame 32 and the swing frame 36 via the connecting shaft 34. The swing motor 35 then drives the hollow rotating column 37, fan cover 38, and other connected components to swing together, changing the direction of the hot air and expanding the drying coverage. At the same time, after the swing motor 35 starts, its output drives the fan blades 391 to rotate at high speed. When the fan blades 391 rotate, the surrounding air is drawn into the fan cover 38. Simultaneously, the four ring-shaped array heating rods 390 on the outer wall of the fixed column 39 are powered on and begin to heat. The air entering the fan shroud 38 is heated by the heating rod 390, forming hot air. Driven by the fan blades 391, the hot air is blown out through the bottom opening of the fan shroud 38 and directed towards the dry mortar being mixed. The hot air can remove the moisture from the mortar, achieving the purpose of drying. Through the wide-angle drying component 3, the hot air blown out from the fan shroud 38 is not fixed in one direction, but can cover multiple different angles and areas within the device, greatly increasing the drying coverage and avoiding localized inadequate drying. This ensures that the dry mortar is dried relatively evenly throughout the device, guaranteeing the consistency and integrity of the drying effect and further accelerating the working efficiency of the device.

[0033] After thorough mixing and drying, the dry-mixed mortar reaches a suitable degree of dryness. By controlling the opening of the solenoid valve 14 on the outer wall of the discharge pipe, the dry-mixed mortar flows out of the device shell 10 under the action of gravity, completing the entire drying process.

[0034] It should be noted that the size and position of the wide-angle drying component 3 are precisely designed so that components such as the fan cover 38 will not collide with the inner wall of the device housing 10 and components such as the hollow rotating rod 29 when they swing.

[0035] The working principle of this high-efficiency and energy-saving dry mortar drying device will be explained in detail below.

[0036] like Figure 1-6 As shown, when it is necessary to mix the dry-mixed mortar, the dry-mixed mortar first enters the device housing 10 through the feed pipe 13. Then, the motor 21 is started after being powered on. The output end of the motor 21 drives the rotating shaft 22 to rotate. When the rotating shaft 22 rotates, the two helical gears 23 rotate synchronously.

[0037] When the two helical gears 23 rotate, they drive the two helical gears 24 to rotate. The right helical gear 24 drives the rotating column 25 connected to it to rotate, and the gear 26 on the rotating column 25 rotates accordingly. Gear 26 meshes with gear 290, causing gear 290 to rotate, which in turn drives the hollow rotating rod 29 to rotate. The rotation of the hollow rotating rod 29 drives the rotating frame 291 fixedly connected to it. Several stirring crossbars 292 on the rotating frame 291 move in a circular motion with the rotation of the hollow rotating rod 29, stirring the dry mortar in the device. At the same time, the left helical gear 24 drives the rotating rod 28 to rotate, and several stirring crossbars 293 fixedly connected to the outer wall of the rotating rod 28 also stir with the rotation of the rotating rod 28. The mixing crossbar 292 is staggered vertically with the mixing crossbar 292. This ensures thorough and comprehensive mixing of the dry-mixed mortar during their counter-rotating mixing process, preventing localized accumulation or inadequate mixing. This allows the mortar to be evenly dispersed within the device, facilitating subsequent drying. Furthermore, the electric telescopic rod 294 can extend and retract as needed, moving the scraper 295 to clean the inner wall of the device casing 10. The coaxial bidirectional mixing component 2 allows for mixing of the dry-mixed mortar from different directions, avoiding dead zones and ensuring thorough mixing of all components. This guarantees the overall uniformity of the dry-mixed mortar, allowing internal moisture to be better exposed on the surface, thus shortening the overall drying time and improving the efficiency of the entire drying device.

[0038] When the dry-mixed mortar needs to be dried, motor 31 starts, and its output drives the connecting crank 33 to rotate. The connecting crank 33 drives the swing motor 35 to swing within the fixed frame 32 and the swing frame 36 via the connecting shaft 34. The swing motor 35 then drives the hollow rotating column 37, fan cover 38, and other connected components to swing together, changing the direction of the hot air and expanding the drying coverage. At the same time, after the swing motor 35 starts, its output drives the fan blades 391 to rotate at high speed. When the fan blades 391 rotate, the surrounding air is drawn into the fan cover 38. Simultaneously, the four ring-shaped array heating rods 390 on the outer wall of the fixed column 39 are powered on and begin to heat. The air entering the fan shroud 38 is heated by the heating rod 390, forming hot air. Driven by the fan blades 391, the hot air is blown out through the bottom opening of the fan shroud 38 and directed towards the dry mortar being mixed. The hot air can remove the moisture from the mortar, achieving the purpose of drying. Through the wide-angle drying component 3, the hot air blown out from the fan shroud 38 is not fixed in one direction, but can cover multiple different angles and areas within the device, greatly increasing the drying coverage and avoiding localized inadequate drying. This ensures that the dry mortar is dried relatively evenly throughout the device, guaranteeing the consistency and integrity of the drying effect and further accelerating the working efficiency of the device.

[0039] After thorough mixing and drying, the dry-mixed mortar reaches a suitable degree of dryness. By controlling the opening of the solenoid valve 14 on the outer wall of the discharge pipe, the dry-mixed mortar flows out of the device shell 10 under the action of gravity, completing the entire drying process.

[0040] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A high efficiency energy saving dry-mix mortar drying apparatus comprising an apparatus housing (10) characterised in that: The bottom of the device shell (10) is fixedly connected with four annularly arranged fixing plates (11), the bottom of each of the four fixing plates (11) is fixedly connected with a supporting leg (12), the top of the device shell (10) is fixedly connected with a feeding pipe (13), the bottom of the device shell (10) is fixedly connected with a discharging pipe, the outer wall of the discharging pipe is fixedly connected with a solenoid valve (14), the inside and the top of the device shell (10) are provided with a coaxial bidirectional stirring assembly (2), and the inner top of the device shell (10) is provided with two left-right symmetrical wide-angle drying assemblies (3).

2. The energy-efficient dry-mixed mortar drying device according to claim 1, characterized in that: The coaxial bidirectional stirring assembly (2) comprises two side plates (20), the bottom of each of the left and right side plates (20) is fixedly connected to the top of the device shell (10), the opposite surfaces of the left and right side plates (20) are rotatably connected with rotating shafts (22), the right side wall of the right side plate (20) is fixedly connected with a motor one (21), the output end of the motor one (21) penetrates through the left side wall of the right side plate (20) and is fixedly connected with the rotating shaft (22), the outer wall of each of the left and right rotating shafts (22) is fixedly connected with a helical gear one (23), and the front side of each of the left and right helical gear ones (23) is meshingly connected with a helical gear two (24).

3. The energy-efficient dry-mixed mortar drying device according to claim 2, characterized in that: The inner wall of the right side helical gear two (24) is fixedly connected with a rotating column (25) rotatably connected with the top of the device shell (10), the outer wall bottom of the rotating column (25) is fixedly connected with a gear one (26), the left side of the gear one (26) is meshingly connected with a gear two (290), the inner wall of the gear two (290) is fixedly connected with a hollow rotating rod (29) rotatably connected with the top of the device shell (10), the inside of the hollow rotating rod (29) is rotatably connected with a rotating rod (28), the inner wall of the left side helical gear two (24) is fixedly connected with the outer wall top of the rotating rod (28), the bottom of the hollow rotating rod (29) penetrates into the inside of the device shell (10), and the bottom of the rotating rod (28) penetrates through the bottom of the hollow rotating rod (29) and extends into the inside of the device shell (10).

4. The energy-efficient dry-mixed mortar drying device according to claim 3, characterized in that: The outer wall bottom of the hollow rotating rod (29) is fixedly connected with two left-right symmetrical rotating frames (291), the opposite surfaces of the left and right rotating frames (291) are fixedly connected with a plurality of up-down equidistantly distributed stirring cross bars one (292), and the side, away from each other, of the left and right rotating frames (291) is fixedly connected with four up-down equidistantly distributed electric telescopic rods (294).

5. The energy-efficient dry-mixed mortar drying device according to claim 1, characterized in that: The wide-angle drying assembly (3) comprises a top plate (30) fixedly connected to the inner top wall of the device shell (10), the bottom of the top plate (30) is fixedly connected with a motor two (31), the outer walls of the left and right sides of the motor two (31) are fixedly connected with a fixed frame (32), the output end of the motor two (31) is fixedly connected with a connecting curved rod (33), one end of the connecting curved rod (33) away from the motor two (31) is rotatably connected with a connecting shaft (34), the left and right inner walls of the fixed frame (32) are rotatably connected with a swing frame (36), the front and rear inner walls of the swing frame (36) are rotatably connected with a swing motor (35), and the top of the swing motor (35) is fixedly connected with the connecting shaft (34).

6. The energy-efficient dry-mixed mortar drying device according to claim 5, characterized in that: The bottom of the swing motor (35) is fixedly connected with a hollow rotating column (37), the bottom of the hollow rotating column (37) is fixedly connected with a fan cover (38), the inner bottom wall of the fan cover (38) is fixedly connected with a fixed column (39), the outer wall of the fixed column (39) is fixedly connected with four heating rods (390) arranged in an annular array, the output end of the swing motor (35) penetrates into the inside of the fan cover (38) and is fixedly connected with a fan blade (391), and the output shaft outer wall of the swing motor (35) is rotatably connected with the hollow rotating column (37) and the fan cover (38).

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