Movable concrete mixing equipment

Abstract

The mobile concrete mixing equipment comprises a gravity mixing drum, the left side of the upper end of the gravity mixing drum communicates with a solid feeding hopper, a liquid feeding pipe is fixedly connected to the center of the left end of the gravity mixing drum, and a forced mixing drum is arranged at the lower end of the gravity mixing drum; the lower side of the front end of the forced stirring barrel communicates with a discharging pipe, the lower end of the forced stirring barrel is fixedly connected with a bottom support, the front sides and the rear sides of the left end and the right end of the bottom support are each rotationally connected with a movable rolling wheel, and concrete raw materials can be stirred in two different forms of gravity stirring and forced stirring, so that the uniformity of concrete is improved; and the left hopper and the right hopper of the solid feeding hopper can accurately control the proportion of solid raw materials entering the stirring inner roller from the left hopper and the right hopper through the forming number and forming positions of the distribution guide holes in the multiple distribution baffles, it is guaranteed that the proportion of the raw materials in the concrete is accurate, and the concrete production quality is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field related to construction, and particularly relates to a mobile concrete mixing equipment. Background Art

[0002] In the field of construction, the quality of concrete is crucial for the stability and durability of projects. Traditional concrete mixing equipment often has many problems.

[0003] On the one hand, most of the existing concrete mixing equipment is large in volume and fixed in position, which is not convenient for moving between different construction sites, increasing the transportation cost and time cost. This greatly limits the construction flexibility and efficiency, especially in some projects with limited sites or frequent construction site changes, the problem is more prominent.

[0004] On the other hand, the mixing method of traditional mixing equipment is relatively single, usually relying only on a single mixing mode for concrete mixing. This makes it difficult to ensure the uniformity of concrete, and it is easy to have uneven concrete composition in some areas, thus affecting the quality of concrete.

[0005] In addition, in terms of the proportion control of concrete raw materials, the existing equipment is often not precise enough. Especially for the proportion control of solid raw materials, it is difficult to accurately adjust according to different concrete mix requirements, which easily leads to unstable concrete performance.

[0006] At the same time, traditional equipment is also inconvenient in terms of maintenance and transportation. The overall structure of the equipment is relatively complex, and it is difficult to disassemble and assemble quickly, which brings great difficulties to the maintenance and transportation of the equipment.

[0007] In summary, in order to solve the problems of inconvenient movement, single mixing method, inaccurate proportion control of raw materials, and difficult maintenance and transportation existing in the existing concrete mixing equipment, the present invention proposes a mobile concrete mixing equipment, aiming to provide a more flexible, efficient, precise and convenient concrete mixing solution for maintenance and transportation. Summary of the Invention

[0008] The purpose of the present invention is to provide a mobile concrete mixing equipment to solve the problems of single mixing method and inaccurate proportion control of raw materials in the existing concrete mixing equipment as mentioned in the above background art.

[0009] To achieve the above object, the present invention provides the following technical solution: A mobile concrete mixing equipment, including a gravity mixing drum, a solid feed hopper is connected to the left side of the upper end of the gravity mixing drum, a liquid feed pipe is fixedly connected to the center of the left end of the gravity mixing drum, a forced mixing drum is arranged at the lower end of the gravity mixing drum, a discharge pipe is connected to the lower front side of the forced mixing drum, a bottom support is fixedly connected to the lower end of the forced mixing drum, and moving rollers are rotatably connected to the front and rear sides of the left and right ends of the bottom support.

[0010] Preferably, a dividing plate is arranged inside the solid feed hopper and divides it into a left hopper and a right hopper through the dividing plate, and the upper end of the dividing plate extends to the outside of the upper end of the solid feed hopper. A mixing inner drum is rotatably connected inside the gravity mixing drum, and there is a gap between the outer wall of the right end of the mixing inner drum and the inner wall of the right end of the gravity mixing drum.

[0011] Preferably, limiting frames are fixedly connected to the inside of the left and right ends of the mixing inner drum. The right end of the mixing inner drum is rotatably connected to a drum motor through the limiting frame and a motor shaft, and the drum motor is fixedly connected to the outside of the center of the right end of the gravity mixing drum.

[0012] Preferably, a plurality of guide grooves opening to the left are formed on the outer side of the left end of the mixing inner drum, and the plurality of guide grooves are all located directly below the solid feed hopper. The solid feed hopper is communicated with the inside of the mixing inner drum through the plurality of guide grooves, and distribution baffles are clamped inside the plurality of guide grooves.

[0013] Preferably, a replacement installation hole is formed in the upper left side of the gravity mixing drum, and the replacement installation hole is located on the left side of the upper plurality of distribution baffles. A liquid guide pipe is fixedly connected to the center of the left end of the left limiting frame, and the right end of the liquid guide pipe is communicated with the inside of the mixing inner drum.

[0014] Preferably, the liquid guide pipe is rotatably connected to the inside of the center of the left end of the gravity mixing drum, and the left end of the liquid feed pipe is inserted into the liquid guide pipe and rotatably connected to the liquid guide pipe. A spiral guiding plate is fixedly connected to the inner wall of the mixing inner drum, and the guiding plate is located on the right side of the plurality of guide grooves.

[0015] Preferably, a transfer conduit is connected to the right side of the lower end of the gravity mixing drum. The transfer conduit is located on the right side of the mixing inner drum, and the lower end of the transfer conduit is located inside the upper right side of the forced mixing drum. A connecting plate is fixedly connected to the lower end of the gravity mixing drum. Connecting ears are arranged on the left and right sides of the lower end of the connecting plate. The two connecting ears are respectively fixedly connected to the left and right sides of the upper end of the forced mixing drum and are fixedly connected to the connecting plate through bolts.

[0016] Preferably, a stirring shaft is rotatably connected to the center inside the forced stirring cylinder, and the lower end of the stirring shaft extends to the outside of the center of the lower end of the forced stirring cylinder. A stirring motor is rotatably connected to the lower end of the stirring shaft, and the stirring motor is fixedly connected to the center of the lower end of the forced stirring cylinder. A plurality of stirring blades with inclined sides are fixedly connected to the outside of the stirring shaft.

[0017] Preferably, one or two distribution guide holes are provided inside the distribution baffle, and there are three types of distribution baffles according to the number and position of the distribution guide holes. The solid feed hopper communicates with the inside of the stirring inner cylinder through the distribution guide holes. A fixing block is fixedly connected to the left end of the distribution baffle, and the fixing block is clamped inside the outer side of the left end of the stirring inner cylinder through a fixing groove.

[0018] Preferably, the fixing groove is provided on the outer side of the right end of the stirring inner cylinder. The fixing block is fixedly connected to the inside of the fixing groove through a bolt, and the outer wall of the right end of the fixing block is flush with the outer wall of the left end of the stirring inner cylinder. A handle groove is provided at the center of the left end of the fixing block.

[0019] Compared with the prior art, the present invention provides a mobile concrete mixing equipment, which has the following

[0020] Beneficial effects:

[0021] 1. Double stirring improves the quality of concrete: The concrete raw materials can be stirred in two different forms, namely gravity stirring and forced stirring, which improves the uniformity of the concrete, thereby significantly improving the quality of the concrete.

[0022] 2. Accurately control the proportion of solid raw materials: The left and right hoppers of the solid feed hopper can accurately control the proportion of solid raw materials entering the stirring inner cylinder through the number and position of the distribution guide holes inside the plurality of distribution baffles, ensuring the accurate proportion of raw materials inside the concrete and guaranteeing the production quality of the concrete.

[0023] 3. Meet the production requirements of different proportions of concrete: The plurality of material guide grooves can accurately control the proportion of solid raw materials through the configuration quantity of three types of distribution baffles, adapt to the production requirements of different proportions of concrete, and improve the scope of use of the equipment.

[0024] 4. Facilitate the replacement and adjustment of the distribution baffle: The plurality of distribution baffles can be replaced and adjusted by swapping the mounting holes. Fixed through the fixing block, fixing groove and bolt, ensure the accurate position between the distribution guide holes opened inside the distribution baffle and the left and right hoppers, and do not interfere with the inner wall of the gravity stirring cylinder. And the distribution baffle can be more conveniently drawn out through the handle groove, facilitating the replacement and adjustment of the plurality of distribution baffles.

[0025] 5. Facilitate maintenance and transportation: The gravity stirring cylinder is connected and disassembled with the forced stirring cylinder through the connecting plate and connecting ear, which is more convenient for maintenance and transportation.

[0026] 6. Improve the efficiency and uniformity of forced stirring: Inside the forced stirring cylinder, the concrete raw materials are stirred horizontally and vertically by a plurality of stirring blades inclined on multiple sides, further improving the stirring efficiency and uniformity and enhancing the quality of the concrete. Description of the Drawings

[0027] Figure 1 It is a schematic three-dimensional structure diagram of the concrete mixing equipment of the present invention.

[0028] Figure 2 It is a schematic diagram of the three-dimensional disassembly of the concrete mixing equipment of the present invention.

[0029] Figure 3 It is a schematic diagram of the connection structure of the gravity stirring cylinder of the present invention.

[0030] Figure 4 It is a schematic diagram of the connection structure of the forced stirring cylinder of the present invention.

[0031] Figure 5 It is a schematic diagram of the three-dimensional sectional structure of the gravity stirring cylinder of the present invention.

[0032] Figure 6 It is a schematic diagram of the connection structure of the inner mixing drum of the present invention.

[0033] Figure 7 It is an enlarged schematic diagram at position A in the bottom bracket of the present invention.

[0034] Figure 8 It is a schematic diagram of the structures of three distribution baffles of the present invention.

[0035] In the figure: 1. Gravity stirring cylinder; 2. Solid feed hopper; 3. Liquid feed pipe; 4. Forced stirring cylinder; 5. Discharge pipe; 6. Bottom bracket; 7. Moving roller; 8. Material distribution plate; 9. Inner mixing drum; 10. Limiting frame; 11. Drum motor; 12. Guide chute; 13. Distribution baffle; 14. Replacement mounting hole; 15. Liquid guide pipe; 16. Guide plate; 17. Transfer conduit; 18. Connecting plate; 19. Connecting ear; 20. Stirring shaft; 21. Stirring blade; 22. Distribution guide hole; 23. Fixed block; 24. Fixed groove; 25. Handle groove. Detailed Embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] The present invention provides a mobile concrete mixing device as Figures 1-8 shown, which includes a gravity mixing drum 1. A solid feed hopper 2 is connected to the left side of the upper end of the gravity mixing drum 1. A liquid feed pipe 3 is fixedly connected to the center of the left end of the gravity mixing drum 1. A forced mixing drum 4 is arranged at the lower end of the gravity mixing drum 1. A discharge pipe 5 is connected to the lower side of the front end of the forced mixing drum 4. A bottom support 6 is fixedly connected to the lower end of the forced mixing drum 4. Moving rollers 7 are rotatably connected to the front and rear sides of the left and right ends of the bottom support 6. A distribution plate 8 is arranged inside the solid feed hopper 2, and the solid feed hopper 2 is separated into a left hopper and a right hopper by the distribution plate 8, and the upper end of the distribution plate 8 extends to the outside of the upper end of the solid feed hopper 2. A transfer conduit 17 is connected to the right side of the lower end of the gravity mixing drum 1. The transfer conduit 17 is located on the right side of the inner mixing drum 9, and the lower end of the transfer conduit 17 is located inside the upper right side of the forced mixing drum 4. The concrete mixing device can be connected to the four moving rollers 7 through the bottom support 6 and move through the four moving rollers 7. The concrete solid raw materials are respectively introduced into the left side inside the gravity mixing drum 1 through the left hopper and the right hopper of the solid feed hopper 2. The concrete liquid raw materials are introduced into the left side inside the gravity mixing drum 1 through the liquid feed pipe 3. The gravity mixing drum 1 performs gravity mixing on the concrete raw materials. After the gravity mixing is completed, the materials are introduced into the forced mixing drum 4 through the transfer conduit 17. Then, the forced mixing drum 4 performs forced mixing on the concrete raw materials. After the forced mixing is completed, the materials are introduced through the discharge pipe 5 for use, so that the concrete raw materials can be mixed in two different forms, improving the uniformity of the concrete and the quality of the concrete.

[0038] Preferably, a stirring inner drum 9 is rotatably connected inside the gravity stirring cylinder 1, and there is a gap between the outer wall of the right end of the stirring inner drum 9 and the inner wall of the right end of the gravity stirring cylinder 1. Limiting frames 10 are fixedly connected to both the left and right ends of the stirring inner drum 9. The right end of the stirring inner drum 9 is rotatably connected to a drum motor 11 through the limiting frame 10, and the drum motor 11 is fixedly connected to the outside of the center of the right end of the gravity stirring cylinder 1. A plurality of material guiding grooves 12 opening to the left are formed on the outer side of the left end of the stirring inner drum 9, and the plurality of material guiding grooves 12 are all located directly below the solid feed hopper 2. The solid feed hopper 2 is communicated with the inside of the stirring inner drum 9 through the plurality of material guiding grooves 12. Distribution baffles 13 are clamped in the plurality of material guiding grooves 12. A liquid guiding pipe 15 is fixedly connected to the center of the left end of the left limiting frame 10, and the right end of the liquid guiding pipe 15 is communicated with the inside of the stirring inner drum 9. The liquid guiding pipe 15 is rotatably connected to the inside of the center of the left end of the gravity stirring cylinder 1, and the left end of the liquid feed pipe 3 is inserted into the liquid guiding pipe 15 and is rotatably connected to the liquid guiding pipe 15. A spiral guiding plate 16 is fixedly connected to the inner wall of the stirring inner drum 9, and the guiding plate 16 is located on the right side of the plurality of material guiding grooves 12. During the process of introducing the concrete raw materials into the gravity stirring cylinder 1, the concrete solid raw materials are introduced into the left side inside of the stirring inner drum 9 through the material guiding grooves 12, and the concrete liquid raw materials are introduced into the left side inside of the stirring inner drum 9 through the liquid feed pipe 3 and the liquid guiding pipe 15. At the same time, the stirring inner drum 9 is driven by the drum motor 11 to rotate inside the gravity stirring cylinder 1, so that the concrete raw materials can roll and be stirred inside the stirring inner drum 9 under the action of gravity, and are guided to the transfer conduit 17 through the guiding plate 16, thereby realizing the gravity stirring of the concrete raw materials.

[0039] Preferably, one or two distribution guide holes 22 are formed inside the distribution baffle 13. The solid feed hopper 2 is communicated with the inside of the stirring inner drum 9 through the distribution guide holes 22. During the process of introducing the concrete solid raw materials into the inside of the stirring inner drum 9, the introduction ratio can be controlled by the distribution baffle 13 inside the material guide groove 12. Since the distribution baffle 13 is provided with three types according to the number and position of the distribution guide holes 22, when one distribution guide hole 22 is formed inside the left side of the distribution baffle 13 and the distribution baffle 13 rotates to the lower end of the solid feed hopper 2, the left hopper can be communicated with the stirring inner drum 9 through the distribution guide hole 22, and the right hopper is closed with the stirring inner drum 9, so that the solid raw materials inside the left hopper can smoothly enter the inside of the stirring inner drum 9. When one distribution guide hole 22 is formed inside the right side of the distribution baffle 13 and the distribution baffle 13 rotates to the lower end of the solid feed hopper 2, the left hopper is closed with the stirring inner drum 9, and the right hopper is communicated with the stirring inner drum 9, so that the solid raw materials inside the right hopper can smoothly enter the inside of the stirring inner drum 9. When distribution guide holes 22 are formed inside both the left and right sides of the distribution baffle 13, both the left and right hoppers are communicated with the inside of the stirring inner drum 9, so that the solid raw materials on the inner walls of the left and right hoppers can smoothly enter the inside of the stirring inner drum 9, enabling the multiple material guide grooves 12 to accurately control the ratio of the solid raw materials through the configuration quantity of the three types of distribution baffles 13, ensuring the accurate ratio of the internal raw materials of the concrete and the production quality of the concrete.

[0040] Preferably, a replacement installation hole 14 is formed in the upper left side of the gravity stirring drum 1, and the replacement installation hole 14 is located on the left side of the multiple distribution baffles 13 on the upper side. The multiple distribution baffles 13 can be replaced and adjusted through the replacement installation hole 14, enabling the multiple distribution baffles 13 to control the concrete with different ratios, so that the concrete mixing equipment can produce the concrete with different ratios and improve the scope of use.

[0041] Preferably, a fixing block 23 is fixedly connected to the left end of the distribution baffle 13. The fixing block 23 is clamped inside the outer side of the left end of the stirring inner drum 9 through a fixing groove 24. The fixing groove 24 is formed on the outer side of the right end of the stirring inner drum 9. The fixing block 23 is fixedly connected inside the fixing groove 24 through a bolt, and the outer wall of the right end of the fixing block 23 is flush with the outer wall of the left end of the stirring inner drum 9. A handle groove 25 is formed at the center of the left end of the fixing block 23. During the process of replacing and adjusting the distribution baffle 13, the distribution baffle 13 can be fixed inside the material guide groove 12 through the fixing block 23 and the fixing groove 24, thereby restricting the position between the distribution guide holes 22 formed inside the distribution baffle 13 and the left and right hoppers and not interfering with the inner wall of the gravity stirring drum 1, ensuring that the concrete solid raw materials can smoothly and accurately pass through the inner wall of the distribution guide hole 22, ensuring that the distribution baffle 13 can accurately control the ratio of the concrete solid raw materials, and enabling the distribution baffle 13 to be more conveniently withdrawn from the inside of the material guide groove 12 through the handle groove 25, facilitating the replacement and adjustment of the multiple distribution baffles 13.

[0042] Preferably, a connecting plate 18 is fixedly connected to the lower end of the gravity stirring cylinder 1. Connecting ears 19 are arranged on the left and right sides of the lower end of the connecting plate 18. The two connecting ears 19 are respectively fixedly connected to the left and right sides of the upper end of the forced stirring cylinder 4 and are fixedly connected to the connecting plate 18 through bolts. A stirring shaft 20 is rotatably connected to the center of the inside of the forced stirring cylinder 4, and the lower end of the stirring shaft 20 extends to the outside of the center of the lower end of the forced stirring cylinder 4. A stirring motor is rotatably connected to the lower end of the stirring shaft 20, and the stirring motor is fixedly connected to the center of the lower end of the forced stirring cylinder 4. A plurality of stirring blades 21 with inclined sides are fixedly connected to the outside of the stirring shaft 20. The gravity stirring cylinder 1 is connected and disassembled with the forced stirring cylinder 4 through the connecting plate 18 and the two connecting ears 19, which is more convenient for maintenance and transportation. When the concrete raw materials enter the inside of the forced stirring cylinder 4, the stirring motor drives the stirring shaft 20 to rotate, and drives a plurality of stirring blades 21 to stir the concrete raw materials in the horizontal direction, so as to realize the forced stirring of the concrete raw materials. Moreover, the stirring blades 21 with inclined sides can push the concrete raw materials upward, so that the concrete raw materials can surge up and down inside the forced stirring cylinder 4, so that when the plurality of stirring blades 21 stir the concrete raw materials in the horizontal direction, they can stir the concrete raw materials in the vertical direction, further improving the stirring efficiency and the stirring uniformity, and further improving the quality of the concrete.

[0043] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mobile concrete mixing equipment, characterized in that: The invention comprises a gravity stirring drum (1), wherein the left side of the upper end of the gravity stirring drum (1) is connected to a solid feed hopper (2), the center of the left end of the gravity stirring drum (1) is fixedly connected to a liquid feed pipe (3), the lower end of the gravity stirring drum (1) is provided with a forced stirring drum (4), the lower side of the front end of the forced stirring drum (4) is connected to a discharge pipe (5), the lower end of the forced stirring drum (4) is fixedly connected to a bottom bracket (6), and the front and rear sides of the left and right ends of the bottom bracket (6) are rotatably connected to movable rollers (7).

2. A mobile concrete mixing equipment according to claim 1, characterized in that: The solid feed hopper (2) is provided with a dividing plate (8) inside, and is separated into a left hopper and a right hopper by the dividing plate (8), and the upper end of the dividing plate (8) extends to the outside of the upper end of the solid feed hopper (2), and the gravity mixing drum (1) is rotatably connected with an inner mixing drum (9), and a gap is provided between the outer wall of the right end of the inner mixing drum (9) and the inner wall of the right end of the gravity mixing drum (1).

3. A mobile concrete mixing equipment according to claim 2, characterized in that: The left and right ends of the inner stirring drum (9) are both fixedly connected to limit frames (10), the right end of the inner stirring drum (9) is rotatably connected to a drum motor (11) via the limit frame (10) and the motor shaft, and the drum motor (11) is fixedly connected to the outside of the center of the right end of the gravity stirring drum (1).

4. A mobile concrete mixing equipment according to claim 3, characterized in that: A plurality of guide grooves (12) opening to the left are provided on the outer side of the left end of the stirring inner drum (9), and the plurality of guide grooves (12) are all located directly below the solid feed hopper (2). The solid feed hopper (2) is connected to the interior of the stirring inner drum (9) through the plurality of guide grooves (12), and distribution baffles (13) are clamped inside the plurality of guide grooves (12).

5. The mobile concrete mixing equipment according to claim 4, characterized in that: The upper left end of the gravity mixing drum (1) is provided with a replacement installation hole (14), and the replacement installation hole (14) is located on the left side of the plurality of distribution baffles (13) on the upper side. A liquid guide tube (15) is fixedly connected to the center of the left end of the left limit frame (10), and the right end of the liquid guide tube (15) is connected to the inside of the mixing inner drum (9).

6. The mobile concrete mixing equipment according to claim 5, characterized in that: The liquid guide tube (15) is rotatably connected to the center of the left end of the gravity mixing drum (1), and the left end of the liquid feed tube (3) is inserted into the liquid guide tube (15) and is rotatably connected to the liquid guide tube (15). A spiral guide plate (16) is fixedly connected to the inner wall of the mixing inner drum (9), and the guide plate (16) is located on the right side of the plurality of guide grooves (12).

7. The mobile concrete mixing equipment according to claim 6, characterized in that: The right side of the lower end of the gravity mixing drum (1) is connected to a material transfer conduit (17), the material transfer conduit (17) is located on the right side of the mixing inner roller (9), and the lower end of the material transfer conduit (17) is located inside the right side of the upper end of the forced mixing drum (4). The lower end of the gravity mixing drum (1) is fixedly connected to a connecting plate (18), and connecting ears (19) are provided on both the left and right sides of the lower end of the connecting plate (18). The two connecting ears (19) are respectively fixedly connected to the left and right sides of the upper end of the forced mixing drum (4), and are fixedly connected to the connecting plate (18) by bolts.

8. The mobile concrete mixing equipment according to claim 7, characterized in that: The forced stirring drum (4) is rotatably connected to a stirring shaft (20) at the center of the interior, and the lower end of the stirring shaft (20) extends to the outside of the center of the lower end of the forced stirring drum (4). The lower end of the stirring shaft (20) is rotatably connected to a stirring motor, and the stirring motor is fixedly connected to the center of the lower end of the forced stirring drum (4). The outside of the stirring shaft (20) is fixedly connected to a plurality of stirring blades (21) with inclined side surfaces.

9. The mobile concrete mixing equipment according to claim 5, characterized in that: The distribution baffle (13) has one or two distribution guide holes (22) opened inside, and the distribution baffle (13) is provided with three types according to the number and opening positions of the distribution guide holes (22). The solid feed hopper (2) is connected to the inside of the stirring inner drum (9) through the distribution guide holes (22). The left end of the distribution baffle (13) is fixedly connected to a fixing block (23), and the fixing block (23) is clamped to the inside of the outer side of the left end of the stirring inner drum (9) through a fixing groove (24).

10. The mobile concrete mixing equipment according to claim 9, characterized in that: The fixing groove (24) is formed on the outer side of the right end of the stirring inner drum (9); the fixing block (23) is fixedly connected to the inside of the fixing groove (24) by means of bolts; the outer wall of the right end of the fixing block (23) is flush with the outer wall of the left end of the stirring inner drum (9); and a hand grip groove (25) is formed at the center of the left end of the fixing block (23).

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