Gravel stirring device for building construction

By designing a sand and gravel mixing device for composite components, efficient and uniform stirring and convenient discharge of materials are achieved, solving the problems of low stirring efficiency and waste of residual materials in the existing technology, and improving construction efficiency.

CN223252013UActive Publication Date: 2025-08-22李佳静
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Patent Information

Application Number
CN202422485188.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-15
Publication Date
2025-08-22
Estimated Expiration
2034-10-15

AI Technical Summary

Technical Problem

The mixing efficiency of existing single-lying shaft mixers for construction is low, the concrete is not uniform after mixing, and the inner wall of the drum is prone to agglomeration, resulting in waste of residual materials.

Method used

A sand and gravel mixing device including support components, lifting components, drive mechanisms, transition modules, stirring mechanisms, guide components and hoisting modules are designed. Through the synchronously rotating agitator and drum, combined with the lifting function of the hoisting module, efficient and uniform stirring and convenient discharge of materials are achieved.

Benefits of technology

It improves the efficiency and uniformity of sand and gravel mixing, reduces the accumulation of residual materials in the drum, and ensures the smooth progress of subsequent production.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a gravel stirring device for building construction, which comprises a support component and a roller, and the support component is at least used for stably supporting the roller on the ground; movable hinged supports are arranged on the two sides of the top of the supporting assembly, and a lifting assembly is arranged above the supporting assembly through the movable hinged supports and at least used for lifting one end of the roller. A driving mechanism is arranged on one side of the lifting assembly, and the driving mechanism is at least used for driving the roller to rotate above the lifting assembly; a transition module is arranged between the lifting assembly and the driving mechanism, and the transition module is at least used for transmitting the movement of the driving mechanism to the roller; a stirring mechanism is inserted into one end of the roller. According to the utility model, the stirring mechanism is arranged in the roller, so that when the roller rotates, the gravel in the roller can be stirred by utilizing the stirring mechanism, and the stirring efficiency and uniformity of the gravel are further improved through the synchronous rotating motion of the stirring mechanism and the roller.
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Description

Technical Field

[0001] The utility model relates to the technical field of building construction, in particular to a sand and gravel mixing device for building construction. Background Art

[0002] In construction, sand and gravel are one of the essential raw materials and are often used. These sand and gravel need to be mixed into concrete raw materials by mixers, and concrete is poured during construction to form a certain building structure.

[0003] A mixer is a type of construction machinery that is primarily used to mix cement, sand, various dry mortars, and other building materials. It uses the rotation of blades to mix a variety of raw materials into a mixture or a suitable consistency.

[0004] Taking the single-horizontal-shaft mixer commonly used in construction as an example, it is generally driven by a motor, and the gears cooperate to realize the rotation of the drum, so that the blades inside the drum continuously stir the sand and gravel.

[0005] However, this type of mixing device has a simple structure and only uses the rotation of the drum, which has low mixing efficiency for sand and gravel, and the uniformity of the concrete after mixing is not good;

[0006] Furthermore, after the drum is used to mix the sand and gravel, the drum needs to rotate in the opposite direction to discharge the concrete from the inside of the drum. When discharging the concrete, a large amount of residual material will be generated. Over time, the residual material will also clump on the inner wall of the drum, which is not conducive to the subsequent use of the mixer. Therefore, it is urgent to design a sand and gravel mixing device for construction to solve the above problems. Summary of the Invention

[0007] The purpose of the utility model is to provide a sand and gravel mixing device for construction to solve the above-mentioned deficiencies in the prior art.

[0008] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0009] A sand and gravel mixing device for construction, comprising a support assembly and a drum, wherein the support assembly is at least used to stably support the drum on the ground;

[0010] Both sides of the top of the support assembly are provided with movable hinges, and a lifting assembly is provided above the support assembly through the movable hinge, and the lifting assembly is used to lift at least one end of the drum;

[0011] A driving mechanism is provided on one side of the lifting assembly, and the driving mechanism is at least used to drive the roller to rotate above the lifting assembly;

[0012] A transition module is provided between the lifting assembly and the driving mechanism, and the transition module is at least used to transmit the movement of the driving mechanism to the drum;

[0013] A stirring mechanism is inserted into one end of the drum, and the stirring mechanism is at least used to achieve efficient and uniform stirring of the sand and gravel inside the drum;

[0014] A guide assembly is provided on the top of the lifting assembly, and the guide assembly is at least used for limiting and guiding the roller after the lifting assembly drives the roller to rise;

[0015] A lifting module is provided inside the supporting assembly, and the lifting module is at least used for lifting the assembly along one end of the movable hinge seat.

[0016] Preferably, the support assembly includes a frame 1, and support legs are fixedly installed at the four corners of the bottom of the frame 1, and an expansion pad is fixedly provided at the bottom end of the support leg.

[0017] Preferably, the lifting assembly includes a second frame, one end of which is mounted on the top of the support assembly via a movable hinge, and a pad is fixedly provided at the bottom of the other end of the second frame.

[0018] Preferably, the driving mechanism includes a bearing seat fixedly mounted on the outer wall of one side of the lifting assembly, and a transmission shaft is arranged inside the bearing seat, large gears are arranged on both sides of the outside of the transmission shaft, a pulley is fixedly mounted on the outer wall of one end of the transmission shaft, a driving member 1 is arranged on the outer wall of one side of the lifting assembly, and a belt is arranged between the output end of the driving member 1 and the pulley.

[0019] Preferably, the transition module includes a positioning frame fixedly mounted on the lifting assembly, and a small gear is provided on the positioning frame.

[0020] Preferably, the drum includes a cylinder, one end of the cylinder is provided with a feeding port, and the other end of the cylinder is provided with a mounting port, gear rings are fixedly provided on both sides of the outside of the cylinder, and spiral blades are provided on the inner wall of the cylinder.

[0021] Preferably, the stirring mechanism includes an embedded plug installed inside one end of the drum, an axle rod is inserted into the interior of the embedded plug, a driving member 2 is provided at one end of the axle rod, a support frame fixed to the outer wall of one side of the lifting assembly is provided at the bottom of the driving member 2, a plurality of sleeves are sleeved on the outside of the axle rod, and a connecting arm is fixedly installed on the outer wall of the sleeve, and a stirring blade is provided at the end of the connecting arm away from the sleeve.

[0022] Preferably, the guide assembly includes a fixed ring arranged on the outer wall of the drum, a fixed seat is provided on the top of the lifting assembly, sliding grooves are provided on the outer walls on both sides of the fixed ring, and a slider inserted into the sliding groove is provided on the inner wall of the fixed seat.

[0023] Preferably, the jacking module includes a bracket installed under the support assembly and a connecting frame installed under the lifting assembly. Both the bracket and the connecting frame are provided with a fixing rod, and a rotating sleeve is sleeved on the outside of the fixing rod. A jack is provided between the rotating sleeve on the bracket and the connecting frame.

[0024] Preferably, a protective cover is provided on the outside of the driving mechanism, and the protective cover is a hollow arc-shaped structure as a whole, and the protective cover is fixedly mounted on the outer wall of one side of the lifting assembly.

[0025] In the above technical solution, the utility model provides a sand and gravel mixing device for construction, which has the following beneficial effects:

[0026] (1) The mixing mechanism installed inside the drum can mix the sand and gravel inside the drum while the drum rotates. The synchronous rotation of the two further improves the efficiency and uniformity of the mixing of sand and gravel. (2) The lifting module is used to drive the lifting assembly to move up and down on the support assembly, so that the lifting assembly can be lifted and rotated along the movable hinge seat, which is conducive to the discharge of the sand and gravel raw materials inside the drum, avoids the accumulation of a large amount of sand and gravel raw materials inside the drum, and facilitates the subsequent production of concrete inside the drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0028] Figure 1 The structure of the sand and gravel mixing device for construction provided by the utility model is three-dimensional. Figure 1 .

[0029] Figure 2 The structure of the sand and gravel mixing device for construction provided by the utility model is three-dimensional. Figure 2 .

[0030] Figure 3 The present invention is a schematic diagram of a drum structure provided in an embodiment of a sand and gravel mixing device for construction.

[0031] Figure 4 This is a schematic structural diagram of a support assembly, a lifting assembly and a guide assembly provided in an embodiment of a sand and gravel mixing device for construction of the present utility model.

[0032] Figure 5The present invention is a schematic diagram of the structure of a mixing mechanism of a sand and gravel mixing device for construction.

[0033] Figure 6 This is a schematic structural diagram of a support assembly and a lifting assembly provided in an embodiment of a sand and gravel mixing device for construction of the present utility model.

[0034] Figure 7 The present invention is a schematic structural diagram of a jacking module provided in an embodiment of a sand and gravel mixing device for construction.

[0035] 1. Support assembly; 11. Enclosure 1; 12. Support legs; 13. Extension pad; 2. Lifting assembly; 21. Enclosure 2; 22. Pad; 3. Drive mechanism; 31. Bearing seat; 32. Drive shaft; 33. Large gear; 34. Pulley; 35. Belt; 36. Drive element 1; 4. Transition module; 41. Positioning frame; 42. Pinion; 5. Drum; 51. Cylinder; 52. Feeding port; 53. Gear ring; 54. Spiral Blade; 55, mounting port; 6, stirring mechanism; 61, embedding plug; 62, support frame; 63, driving part 2; 64, shaft; 65, shaft sleeve; 66, connecting arm; 67, stirring blade; 7, guide assembly; 71, fixing ring; 72, slide groove; 73, fixing seat; 8, lifting module; 81, bracket; 82, connecting frame; 83, fixing rod; 84, rotating sleeve; 85, lifting device; 9, movable hinge seat; 10, protective cover. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] like Figure 1-7 As shown, an embodiment of the present invention provides a sand and gravel mixing device for construction, comprising a support assembly 1 and a drum 5, wherein the support assembly 1 is at least used for stably supporting the drum 5 on the ground; movable hinge seats 9 are provided on both sides of the top of the support assembly 1, and a lifting assembly 2 is provided above the support assembly 1 through the movable hinge seat 9, and the lifting assembly 2 is at least used for lifting and lowering one end of the drum 5; a driving mechanism 3 is provided on one side of the lifting assembly 2, and the driving mechanism 3 is at least used to drive the drum 5 to rotate above the lifting assembly 2; a transition module 4 is provided between the lifting assembly 2 and the driving mechanism 3, and the transition module 4 is at least used to transmit the movement of the driving mechanism 3 to the drum 5; a stirring mechanism 6 is inserted into one end of the drum 5, and the stirring mechanism 6 is at least used to achieve efficient and uniform stirring of the sand and gravel inside the drum 5; a guide assembly 7 is provided on the top of the lifting assembly 2, and the guide assembly 7 is at least used to limit and guide the drum 5 after the lifting assembly 2 drives the drum 5 to rise; a jacking module 8 is provided inside the support assembly 1, and the jacking module 8 is at least used to lift and lower the lifting assembly 2 along one end of the movable hinge seat 9.

[0038] In this embodiment, a support assembly 1 is included, and the support assembly 1 is at least used to stably support the roller 5 on the ground;

[0039] Specifically, the support assembly 1 includes a frame 11, and support legs 12 are fixedly installed at the four corners of the bottom of the frame 11. An expansion pad 13 is fixedly provided at the bottom end of the support leg 12. The area of ​​the expansion pad 13 is larger than the area of ​​the support leg 12, so it can increase the contact area between the support leg 12 and the ground, ensuring the stability of the frame 11 and achieving better support effect for the roller 5.

[0040] In this embodiment, the roller 5;

[0041] Specifically, the drum 5 includes a cylinder 51, one end of which is provided with a feeding port 52, and the other end of the cylinder 51 is provided with a mounting port 55. The stirring mechanism 6 can be installed inside the mounting port 55. Gear rings 53 are fixedly provided on both sides of the outside of the cylinder 51. The gear rings 53 are transmission-connected to the pinion 42. Spiral blades 54 are provided on the inner wall of the cylinder 51. When the cylinder 51 rotates, the spiral blades 54 move with it, so that the sand and gravel raw materials inside the cylinder 51 can be evenly and efficiently mixed.

[0042] In this embodiment, movable hinges 9 are provided on both sides of the top of the support assembly 1. The movable hinges 9 include an upper seat, a lower seat and a pin shaft, so that after one end of the lifting assembly 2 is raised, the lifting assembly 2 is supported and rotated by the movable hinges 9. The lifting assembly 2 is provided above the support assembly 1 through the movable hinges 9. The lifting assembly 2 is used to lift at least one end of the drum 5.

[0043] Specifically, the lifting assembly 2 includes a second frame 21, one end of the second frame 21 is installed on the top of the support assembly 1 through a movable hinge seat 9, and a pad 22 is fixedly provided at the bottom of the other end of the second frame 21. The pad 22 can be hard rubber, which plays a buffering effect on the lifting assembly 2 and the support assembly 1 when the lifting assembly 2 falls.

[0044] In this embodiment, a driving mechanism 3 is provided on one side of the lifting assembly 2, and the driving mechanism 3 is at least used to drive the roller 5 to rotate above the lifting assembly 2;

[0045] Specifically, the driving mechanism 3 includes a bearing seat 31 fixedly mounted on the outer wall of one side of the lifting component 2, and a transmission shaft 32 is provided inside the bearing seat 31, and large gears 33 are provided on both sides of the outside of the transmission shaft 32. A pulley 34 is fixedly mounted on the outer wall of one end of the transmission shaft 32, and a driving member 36 is provided on the outer wall of one side of the lifting component 2. The driving member 36 can be a driving motor or a hydraulic pump, and a belt 35 is provided between the output end of the driving member 36 and the pulley 34;

[0046] Start the driving member 36, and drive the pulley 34 to rotate through the belt 35. The pulley 34 drives the large gear 33 to rotate through the transmission shaft 32. The large gear 33 drives the small gear 42 to rotate. The small gear 42 cooperates with the ring gear 53 to allow the drum 5 to rotate above the lifting component 2 to achieve stirring of the sand and gravel.

[0047] In this embodiment, a transition module 4 is provided between the lifting assembly 2 and the driving mechanism 3 , and the transition module 4 is at least used to transmit the motion of the driving mechanism 3 to the roller 5 ;

[0048] Specifically, the transition module 4 includes a positioning frame 41 fixedly mounted on the lifting assembly 2, and a pinion 42 is provided on the positioning frame 41. There are at least three pinions 42, which are arranged in an even number on both sides of the top of the lifting assembly 2. The pinions on each side are distributed in a straight line. The pinion on one side of the top of the lifting assembly 2 serves as support and driven motion, and the pinion on the other side of the top of the lifting assembly 2 serves as support and active motion.

[0049] In this embodiment, a stirring mechanism 6 is inserted into one end of the drum 5, and the stirring mechanism 6 is at least used to achieve efficient and uniform stirring of the sand and gravel inside the drum 5;

[0050] Specifically, the stirring mechanism 6 includes an embedded plug 61 installed inside one end of the drum 5. The embedded plug 61 is inserted into the inside of the installation opening 55 to realize the installation of the stirring mechanism 6 on the drum 5, and the embedded plug 61 can rotate inside the installation opening 55. A shaft 64 is inserted into the interior of the embedded plug 61. A second driving member 63 is provided at one end of the shaft 64. The second driving member 63 can be a driving motor or a hydraulic pump. A support frame 62 fixed to the outer wall of one side of the lifting assembly 2 is provided at the bottom of the second driving member 63. A plurality of shaft sleeves 65 are sleeved on the outside of the shaft 64, and a connecting arm 66 is fixedly installed on the outer wall of the shaft sleeve 65. A stirring blade 67 is provided at the end of the connecting arm 66 away from the shaft sleeve 65.

[0051] Starting the second driving member 63 can drive the shaft 64 to rotate, and the shaft 64 drives the sleeve 65 and the connecting arm 66 to rotate, so that the stirring blade 67 rotates inside the cylinder 51, thereby stirring the sand and gravel inside the cylinder 51. The movement of the stirring mechanism 6 is coordinated with the rotation of the drum 5, which further improves the stirring effect of the sand and gravel.

[0052] In this embodiment, a guide assembly 7 is provided on the top of the lifting assembly 2. The guide assembly 7 is at least used to limit and guide the roller 5 after the lifting assembly 2 drives the roller 5 to rise.

[0053] Specifically, the guide assembly 7 includes a fixed ring 71 arranged on the outer wall of the drum 5, a fixed seat 73 is arranged on the top of the lifting assembly 2, and a slide groove 72 is arranged on the outer walls on both sides of the fixed ring 71. A slider inserted into the inside of the slide groove 72 is provided on the inner wall of the fixed seat 73. The slider is clamped in the inside of the slide groove 72, so that when the drum 5 rotates, the fixed ring 71 can always be connected to the fixed seat 73 and maintain relative rotation. After the lifting assembly 2 is raised, the stability of the drum 5 on the lifting assembly 2 can also be guaranteed.

[0054] In this embodiment, a lifting module 8 is provided inside the support assembly 1, and the lifting module 8 is used to lift at least one end of the lifting assembly 2 along the movable hinge seat 9;

[0055] Specifically, the jacking module 8 includes a bracket 81 installed under the support assembly 1 and a connecting frame 82 installed under the lifting assembly 2. A fixed rod 83 is provided on the bracket 81 and the connecting frame 82, and a rotating sleeve 84 is sleeved on the outside of the fixed rod 83. A jacking device 85 is provided between the bracket 81 and the rotating sleeve 84 on the connecting frame 82. The jacking device 85 can be a hydraulic cylinder. After the mixing of the sand and gravel inside the drum 5 is completed, the jacking device 85 is started to extend the jacking device 85. Under the action of the fixed rod 83 and the rotating sleeve 84, the jacking device 85 can be rotated, thereby utilizing the jacking device 85 to drive the lifting assembly 2 to rise and fall on the support assembly 1 along the movable hinge seat 9.

[0056] In this embodiment, a protective cover 10 is provided on the outside of the driving mechanism 3, and the protective cover 10 is a hollow arc structure as a whole. The protective cover 10 is fixedly installed on the outer wall of one side of the lifting component 2. The protective cover 10 is used to protect the driving mechanism 3 and prevent workers from being injured.

[0057] Working principle: (1) Workers can move the mixing device to a designated location on the construction site and use the support assembly 1 to stably install the device on the ground;

[0058] (2) Workers can add sand and gravel raw materials into the drum 5 through the feeding port 52 using tools such as buckets or manually;

[0059] (3) Start the driving mechanism 3, use the driving mechanism 3 to drive the drum 5 to rotate through the transition module 4, and use the spiral blades 54 inside the drum 5 to stir the sand and gravel inside it;

[0060] (4) While step (3) is being carried out, the stirring mechanism 6 can also be started so that the stirring mechanism 6 rotates in the opposite direction to the drum 5, thereby achieving sufficient stirring of the sand and gravel raw materials inside the drum 5;

[0061] (5) After the mixing of the sand and gravel is completed, the worker can start the jacking module 8, use the jacking device 85 to drive one end of the lifting component 2 to rise, and let the lifting component 2 rotate along the movable hinge seat 9, thereby driving one end of the drum 5 to rise, and then use the reverse rotation of the drum 5, the spiral blades 54 inside it and the tilted drum 5 to better realize the discharge operation of the sand and gravel, and avoid leaving a lot of residual material inside the drum 5.

[0062] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A sand and gravel mixing device for construction, comprising a support assembly (1) and a drum (5), characterized in that: The support assembly (1) is at least used to stably support the roller (5) on the ground; Both sides of the top of the support assembly (1) are provided with movable hinge seats (9), and a lifting assembly (2) is provided above the support assembly (1) through the movable hinge seat (9), and the lifting assembly (2) is used for lifting at least one end of the roller (5); A driving mechanism (3) is provided on one side of the lifting assembly (2), and the driving mechanism (3) is at least used to drive the roller (5) to rotate above the lifting assembly (2); A transition module (4) is provided between the lifting assembly (2) and the driving mechanism (3), and the transition module (4) is at least used to transmit the movement of the driving mechanism (3) to the roller (5); A stirring mechanism (6) is inserted into one end of the drum (5), and the stirring mechanism (6) is at least used to achieve efficient and uniform stirring of the sand and gravel inside the drum (5); A guide assembly (7) is provided on the top of the lifting assembly (2), and the guide assembly (7) is at least used for limiting and guiding the roller (5) after the lifting assembly (2) drives the roller (5) to rise; A lifting module (8) is provided inside the support assembly (1), and the lifting module (8) is used at least to lift the assembly (2) along one end of the movable hinge seat (9).

2. A sand and gravel mixing device for construction according to claim 1, characterized in that: The support assembly (1) comprises a frame (11), and support legs (12) are fixedly installed at the four corners of the bottom of the frame (11), and an expansion pad (13) is fixedly provided at the bottom end of the support leg (12).

3. A sand and gravel mixing device for construction according to claim 1, characterized in that: The lifting assembly (2) includes a second frame (21), one end of which is mounted on the top of the support assembly (1) via a movable hinge seat (9), and a pad (22) is fixedly provided at the bottom of the other end of the second frame (21).

4. A sand and gravel mixing device for construction according to claim 1, characterized in that: The driving mechanism (3) includes a bearing seat (31) fixedly mounted on the outer wall of one side of the lifting component (2), and a transmission shaft (32) is provided inside the bearing seat (31), large gears (33) are provided on both sides of the outside of the transmission shaft (32), a pulley (34) is fixedly mounted on the outer wall of one end of the transmission shaft (32), a driving member (36) is provided on the outer wall of one side of the lifting component (2), and a belt (35) is provided between the output end of the driving member (36) and the pulley (34).

5. A sand and gravel mixing device for construction according to claim 1, characterized in that: The transition module (4) comprises a positioning frame (41) fixedly mounted on the lifting assembly (2), and a small gear (42) is provided on the positioning frame (41).

6. A sand and gravel mixing device for construction according to claim 1, characterized in that: The drum (5) comprises a cylinder (51), one end of the cylinder (51) is provided with a feeding port (52), and the other end of the cylinder (51) is provided with a mounting port (55), gear rings (53) are fixedly provided on both sides of the outside of the cylinder (51), and spiral blades (54) are provided on the inner wall of the cylinder (51).

7. A sand and gravel mixing device for construction according to claim 1, characterized in that: The stirring mechanism (6) includes an embedded plug (61) installed inside one end of the drum (5), a shaft (64) is inserted into the interior of the embedded plug (61), a driving member 2 (63) is provided at one end of the shaft (64), a support frame (62) fixed to the outer wall of one side of the lifting component (2) is provided at the bottom of the driving member 2 (63), a plurality of shaft sleeves (65) are sleeved on the outside of the shaft (64), and a connecting arm (66) is fixedly installed on the outer wall of the shaft sleeve (65), and a stirring blade (67) is provided at the end of the connecting arm (66) away from the shaft sleeve (65).

8. A sand and gravel mixing device for construction according to claim 1, characterized in that: The guide assembly (7) includes a fixed ring (71) arranged on the outer wall of the roller (5), a fixed seat (73) is arranged on the top of the lifting assembly (2), sliding grooves (72) are arranged on the outer walls on both sides of the fixed ring (71), and a sliding block inserted into the sliding groove (72) is arranged on the inner wall of the fixed seat (73).

9. A sand and gravel mixing device for construction according to claim 1, characterized in that: The lifting module (8) includes a bracket (81) installed below the support assembly (1) and a connecting frame (82) installed below the lifting assembly (2), wherein the bracket (81) and the connecting frame (82) are both provided with a fixing rod (83), and a rotating sleeve (84) is sleeved on the outside of the fixing rod (83), and a lifting device (85) is provided between the rotating sleeve (84) on the bracket (81) and the connecting frame (82).

10. The sand and gravel mixing device for construction according to claim 1, characterized in that: A protective cover (10) is provided on the outside of the driving mechanism (3), and the protective cover (10) is a hollow arc-shaped structure as a whole. The protective cover (10) is fixedly mounted on the outer wall of one side of the lifting assembly (2).